阅读说明：本技术 用于调整发动机爆震背景噪声水平的方法和系统 (For adjusting the method and system of combustion knock background noise level ) 是由 穆罕纳德·哈基姆 克里斯多夫·格鲁格拉 詹姆斯·金德利 李·B·麦奎因 于 2019-05-20 设计创作，主要内容包括：本公开提供了“用于调整发动机爆震背景噪声水平的方法和系统”。提供了用于操作包括爆震控制系统的可变排量发动机的方法和系统。可以在停用一个或多个气缸时应用在全气缸操作模式期间确定的发动机爆震背景噪声水平来确定发动机爆震的存在或不存在。另外,可以在重新启动一个或多个气缸时应用在全气缸操作模式期间确定的发动机爆震背景噪声水平,使得所述发动机在所有气缸都在燃烧的情况下进行操作,以使得可以避免在不存在爆震时指示爆震的可能性。(Present disclose provides " for adjusting the method and system of combustion knock background noise level ".Provide the method and system for operating the modulated displacement engine including knock control system.The combustion knock background noise level determined during full cylinder operation mode can be applied to determine the existence or non-existence of combustion knock when deactivating one or more cylinders.In addition, the combustion knock background noise level determined during full cylinder operation mode can be applied when restarting one or more cylinders, so that the engine is all operated in the case where burning in all cylinders, so that can be to avoid when pinking be not present a possibility that instruction pinking.)

1. a kind of method of engine operation, the method for engine operation include:

Into first operator scheme, under the first operator scheme, the first cylinder is deactivated via controller；And

Via the controller according to relative to several conditions and the first background noise level of the second cylinder of establishment generates The pinking of second cylinder indicates, the condition includes first cylinder is deactivated during the first cycle of engine direct Injector, first cylinder burning fuel during first cycle of engine.

2. the method as described in claim 1, the method also includes being indicated in response to the pinking by second cylinder Spark timing delay.

3. the method as described in claim 1, the method also includes integrating and correct the output of detonation sensor, the pinking The output of sensor is sampled during the knock window of second cylinder, and the wherein institute of second cylinder State the crankshaft degree section during the expansion stroke that knock window is second cylinder.

4. method as claimed in claim 3, the method also includes to the described by integrating and rectifying of the detonation sensor Positive output carries out low-pass filtering to provide first background noise level.

5. method as claimed in claim 4, the method also includes making the described by integration and strong of the detonation sensor Positive output passes through the output integrated and corrected by low-pass filtering divided by the described of the detonation sensor to determine pinking Strength level, and wherein the pinking instruction is horizontal based on the knock intensity.

6. the method as described in claim 1, the method also includes exiting the first operator scheme and enter the second operation Mode, in the second operation mode, all cylinders all activity and via the controller according to relative to several Second background noise level of condition and second cylinder of establishment provides the pinking instruction of second cylinder, the item Part includes the direct injector for starting first cylinder during the second cycle of engine, first cylinder described Burning fuel, second cycle of engine occur before entering the first operator scheme during second cycle of engine.

7. method as claimed in claim 6, wherein the first operator scheme is wherein each circulation in the engine Period deactivates the mode of at least one cylinder.

8. a kind of system for operating engine, the system for operating engine include:

Modulated displacement engine, the modulated displacement engine include the port fuel injector for each cylinder With direct fuel injector；And

Controller, the controller include executable instruction, and the executable instruction is stored in non-transitory memory with In All cylinders all operate the modulated displacement engine in the case where burning fuel；In all cylinders all in burning fuel when follow Deactivate to sequence the direct fuel injector of each cylinder；And from when in all cylinders all in burning fuel when stop The detonation sensor output sampled when at least one direct fuel injector generates the cylinder knocking of each cylinder Background noise level.

9. system as claimed in claim 8, the system also includes for via port fuel injector by fuel injection To the extra instruction of cylinder.

10. system as claimed in claim 8, the system also includes adjust spark timing for indicating in response to pinking Extra instruction.

11. system as claimed in claim 10, wherein pinking instruction is based on the cylinder knocking background noise level.

12. system as claimed in claim 10, wherein adjustment spark timing includes postponing spark timing.

Technical field

This application involves for establishing the combustion knock background noise level and sound that depend on fuel injector operation The method and system of combustion knock should be detected in the combustion knock background noise level established.

Background technique

After originating the igniting in one or more cylinders by spark and by cylinder When high temperature and high pressure lights end gas, internal combustion engine may undergo pinking.The end gas is not by cylinder Flame kernel caused by spark is lighted.It is most often negative in higher engine when the pressure in the cylinder of engine is higher There is combustion knock under lotus.

Engine, also known as modulated displacement engine can also be operated under the activity of variable number or the cylinder that is deactivated (or VDE) allows to optionally will while increasing engine fuel economy for the output of desired engine torque Total exhaust mixture air-fuel ratio maintains around stoichiometry.In some instances, it can be deactivated during selected condition The half of the cylinder of engine, wherein can be for example, by parameters such as engine speed/load window, car speeds to define State selected condition.It in other examples, can individually and selectively deactivated cylinder.

If grasped in the case where starting all cylinders less than engine to provide the output of desired engine torque Make engine, then the pressure in movable cylinder will be above to start all cylinders identical to provide The pressure in cylinder in the case where desired engine torque.Therefore, with always the cylinder of all engines all The case where engine is operated in movable situation is compared, and engine may undergo quick-fried under lower operator demand's torque Shake.

The combustion knock on VDE can be controlled by the spark in starting cylinder and/or delay moving cylinder.So And often through by background engine noise (for example, vibration) it is horizontal with there are the songs of the tendency of higher combustion knock Engine noise level during axis section is compared to identification combustion knock.When deactivating cylinder, background hair Motivation noise level may reduce, and when the cylinder that restarting is deactivated, background engine noise is horizontal It may will increase.The background noise level of variation may cause engine knock control when combustion knock is not present It indicates combustion knock, and is also possible to that engine knock control can be caused not indicate to start when there are combustion knock Machine pinking.Accordingly, it is desirable to provide it is a kind of increase engine knock control when engine changes between VDE mode can By the mode of property.

Summary of the invention

Herein inventors have realised that combustion knock detection may be damaged during VDE mode changes, and And a kind of method of engine operation is developed, comprising: enter first operator scheme, wherein deactivating the first gas via controller Cylinder；And via the controller according to relative to several conditions and the first background noise level of the second cylinder of establishment produces The pinking instruction of raw second cylinder, the condition include first cylinder is deactivated during the first cycle of engine straight Connect injector, first cylinder burning fuel during first cycle of engine.

By according to the generation of the first background noise level of second cylinder relative to several condition establishments The combustion knock of second cylinder indicates, the condition includes first cylinder is deactivated during the first cycle of engine straight Connect fuel injector, it is possible to provide the technical result for improving the combustion knock detection to modulated displacement engine.It is specific next It says, when being deactivated during several cycle of engine and restarting direct fuel injector invasively, it will be appreciated that or really Vertical combustion knock background noise level.It then can be in the understood engine background noise level of the application of time later to mention For the better estimation of the engine background noise level to each cylinder, allow to generate more reliable engine Pinking instruction.For example, it can make an uproar when entering and exiting cylinder deactivation mode using the understood engine background Sound is horizontal.

In this manner it is possible to improve the knock detection to modulated displacement engine.Mistake is generated furthermore it is possible to reduce A possibility that combustion knock indicates.In addition, can be improved when not postponing spark due to the error indication of combustion knock Engine fuel economy.

It should be understood that above summary is provided introduce in simplified form further described in detailed description it is a series of general It reads.It is not intended that identifying the key or substantive characteristics of theme claimed, the range of theme claimed is unique It is defined by claims after the specific embodiment on ground.In addition, theme claimed is not limited in solution It states or the implementation of any disadvantage described in any part of the disclosure.

Detailed description of the invention

Figure 1A shows the schematic depiction of the engine system of vehicle.

Figure 1B shows the exemplary position of the detonation sensor of V8 engine.

Fig. 1 C shows the alternative view of the detonation sensor position of V8 engine.

Fig. 2 shows the high level flow chart of the mode of operation modulated displacement engine, the mode includes control and determining hair The combustion knock background noise level of motivation cylinder.

Fig. 3 shows the flow chart for the method for determining the combustion knock background noise level of modulated displacement engine.

Fig. 4 shows the block diagram for the observer for estimating the combustion knock background noise level of modulated displacement engine.

How the fuel injection control movement that Fig. 5 shows one cylinder of explanation can influence different cylinders Background combustion knock noise level timing diagram.

Fig. 6 shows whether engine is deactivated under VDE mode for diagnosing based on combustion knock background noise level The method of cylinder.

Fig. 7 to Figure 11 is shown for adjustment VDE mode, injector timing and spray there are VDE mode variation Emitter mode is to provide the flow chart of more consistent combustion knock background noise level.

Figure 12 to Figure 16 is shown can be in the method for application drawing 2, Fig. 3 and Fig. 7 to Figure 11 to provide more consistent engine The exemplary sequence of pinking background noise level.

Figure 17, which is shown, illustrates how the fuel injection control movement of several cylinders can influence several differences and start The timing diagram of the background combustion knock noise level of machine cylinder.

Figure 18 illustrate the method for application drawing 3 with determine cylinder combustion knock background noise level it is exemplary Sequence.

Specific embodiment

It is described below and is related to for operating modulated displacement engine (VDE) and the engine of control and detection VDE engine The system and method for pinking.The engine can be the type shown in Figure 1A to Fig. 1 C.It can be according to fig. 2 to Figure 11's Method operates the engine.The adjustable VDE mode of the method and fuel injector timing are to allow constantly to assess one The engine background noise of a little cylinders is horizontal.In addition, the method is even during VDE mode variation also by engine Pinking background noise level maintain they present worth or near.Figure 12 to Figure 16 is shown to VDE mode and fuel injection timing It is adjusted to provide the exemplary sequence of the more consistent engine background noise level of some cylinders.Figure 17 is shown Only several cylinder knock windows are influenced by controlling the movement of fuel injector associated with other cylinders The engine timing sequence of mouth.Figure 18 shows the exemplary sequence for determining combustion knock background noise level, and its In can be advantageously horizontal using the engine background noise.

Turning now to figure, Figure 1A is depicted in the example of the cylinder 14 for the internal combustion engine 10 that in vehicle 5 may include.Start Machine 10 can be modulated displacement engine (VDE), as described further below.Engine 10 can be at least partly by including control The control system of device 12 processed and the input via input unit 132 from mankind's vehicle operators 130 control.Herein In example, input unit 132 includes accelerator pedal and pedal position sensor 134 for generating ratio pedal position signal. The cylinder (being also known as " combustion chamber " herein) 14 of engine 10 may include chamber wall 136 and the piston 138 that is positioned in. Piston 138 can be connected to crankshaft 140, so that the reciprocating motion of piston is converted into the rotary motion of crankshaft.Crankshaft 140 can be with At least one wheel 55 of vehicle 5 is connected to via speed changer 54, as described further below.In addition, starter motor is (not Show) crankshaft 140 can be connected to via flywheel to realize the start-up function of engine 10.

In some instances, vehicle 5 can be with the multiple torque sources that can be used for one or more vehicle wheels 55 Hybrid vehicle.In other examples, vehicle 5 is only conventional vehicles with engine or only electronic with a motor Vehicle.In shown example, vehicle 5 includes engine 10 and motor 52.Motor 52 can be motor or motor/power generation Machine.When engaging one or more clutches 56, the crankshaft 140 and motor 52 of engine 10 are connected to via speed changer 54 Wheel 55.In discribed example, between crankshaft 140 and motor 52 provide first clutch 56, and motor 52 with Second clutch 57 is provided between speed changer 54.Controller 12 can send signal to the actuator of each clutch 56 to nibble Conjunction or disconnecting clutch, to be connected or disconnected from crankshaft 140 with motor 52 and the component connecting with the motor, and/ Or it is connected or disconnected from motor 52 with speed changer 54 and the component connecting with the speed changer.Speed changer 54 can be gear Case, planetary gear system or another type of speed changer.

Power drive system can be configured by various modes, including is configured to parallel connection, series connection or serial-parallel mixing and is moved Power vehicle.In electric vehicle example, system battery 58, which can be, delivers power to motor 52 to provide to wheel of vehicle 55 The traction battery of torque.In some instances, motor 52 can also be operated as generator for example during brake operating to provide Electric power charges to system battery 58.It will be appreciated that, in other examples for including on-electric vehicle example, system battery 58 It can be the typical starting, illumination, igniting (SLI) battery for being connected to alternating current generator 46.

Alternating current generator 46 may be configured to come during engine is run using via the engine torque of crankshaft 140 It charges to system battery 58.In addition, alternating current generator 46 can power to one or more electrical systems of engine, institute Stating one or more electrical systems to be, for example, includes heating, ventilation and air conditioning (HVAC) system, car light, vehicle entertainment system One or more auxiliary systems, and other auxiliary systems of the corresponding electrical demands based on them.In one example, The electric current drawn on alternating current generator can be based on operator compartment cooling requirement, battery charging requirement, other auxiliary vehicles System requirements and motor torque and constantly change.Voltage regulator can be connected to alternating current generator 46 to make based on system With requiring the power output for adjusting alternating current generator (including auxiliary system demand).

The cylinder 14 of engine 10 can be received via a series of air intake ducts 142 and 144 and inlet manifold 146 into Gas.Inlet manifold 146 can be connected to other cylinders other than cylinder 14 of engine 10.One of air intake duct is more Person may include one or more supercharging devices, such as turbocharger or mechanical supercharger.For example, Figure 1A shows and is matched It is equipped with the engine 10 of turbocharger, the turbocharger includes the compressor being arranged between air intake duct 142 and 144 174, and the exhaust driven gas turbine 176 arranged along exhaust duct 135.When supercharging device is configured to turbocharger, compressor 174 at least partly can provide power via shaft 180 by exhaust driven gas turbine 176.However, in other examples, such as starting When machine 10 has mechanical supercharger, power can be supplied to compressor 174 by the mechanical input from motor or engine, and And it can optionally omit exhaust driven gas turbine 176.In other examples, engine 10 can have motor machine booster (for example, " eBooster "), and compressor 174 can be by electrical motor driven.In other examples, engine 10 may not have increasing Pressure device, such as when engine 10 is naturally aspirated engine.

Air throttle 162 including choke block 164 can be provided in engine inlets and be supplied to engine to change The flow rate and/or pressure of the air inlet of cylinder.For example, air throttle 162 can be positioned at the downstream of compressor 174, such as Shown in Figure 1A, or the air throttle alternatively can be provided in the upstream of compressor 174.It can be via from air throttle position The position of air throttle 162 is transmitted to controller 12 by the signal for setting sensor.

Discharge manifold 148 can receive discharge gas from other cylinders other than cylinder 14 of engine 10.Exhaust Sensor 126 is shown as being connected to discharge manifold 148 in the upstream of emission control system 178.Exhaust sensor 126 can be selected from For providing the various suitable sensors of the instruction of exhaust/fuel ratio (AFR), for example, linear oxygen sensors or UEGO it is (logical With or wide scope discharge gas oxygen), two condition lambda sensor or EGO, HEGO (by the EGO of heating), NOx, HC or CO sensing Device.In the example of Figure 1A, exhaust sensor 126 is UEGO sensor.Emission control system 178 can be three-way catalyst, NOx trap, various other emission control systems, or combinations thereof.In the example of Figure 1A, emission control system 178 is ternary Catalyst.

Each cylinder of engine 10 may include one or more inlet valves and one or more exhaust valves.Citing comes It says, cylinder 14 is shown as including at least one inlet poppet valves 150 and at least one exhaust at the upper zone of cylinder 14 Poppet 156.In some instances, each cylinder of engine 10, including cylinder 14 may include positioned at the upper of the cylinder At least two inlet poppet valves and at least two exhaust poppet valves at area, portion.In this example, inlet valve 150 can be by controlling For device 12 by controlling via the cam-actuated of cam-actuated system 152, the cam-actuated system includes one or more convex Wheel 151.Similarly, exhaust valve 156 can be by controller 12 via the cam-actuated system for including one or more cams 153 154 control.It the position of inlet valve 150 and exhaust valve 156 can be respectively by valve position sensor (not shown) and/or cam Shaft position sensor 155 and 157 determines.

During some conditions, controller 12 can change the signal for being supplied to cam-actuated system 152 and 154, thus Control the opening and closing of corresponding intake and exhaust valves.Inlet valve timing and exhaust valve timing can be controlled simultaneously, or Variable air inlet cam timing, variable exhaust cam timing, double independent variable cam timings or fixed cam timing can be used Any one of possibility.Each cam-actuated system may include one or more cams and can use variable displacement hair Motivation (VDE), cam profile convert (CPS) system, variable cam timing (VCT) system, variable valve timing (VVT) system And/or one or more of lift range variable (VVL) system, controller 12 can operate the system to change valve behaviour Make.In alternative exemplary, inlet valve 150 and/or exhaust valve 156 can be controlled by electric air valve actuating.For example, gas Cylinder 14 can alternatively include via the inlet valve of electric air valve actuation control and via including CPS system and/or VCT system The exhaust valve of cam-actuated control.In other examples, it by common valve actuator (or actuating system) or can be changed Valve timing actuator (or actuating system) controls intake and exhaust valves.

As further described herein, inlet valve 150 can be deactivated via the rocker arm body of electric actuation during VDE mode With exhaust valve 156.In another example, inlet valve 150 and exhaust valve 156 can be deactivated via CPS mechanism, wherein not having The cam lobe of lift is used for the valve being deactivated.For example other valves still can also be used to deactivate for the valve of electric actuation Mechanism.It in one example, can be by the first VDE actuator (for example, being connected to the rocker arm of the first electric actuation of inlet valve 150 Mechanism) control inlet valve 150 deactivates, and by the 2nd VDE actuator (for example, being connected to the second electric actuation of exhaust valve 156 Rocker arm body) control deactivating for exhaust valve 156.In alternative exemplary, single VDE actuator can control the inlet valve of cylinder With deactivating for both exhaust valves.In other examples, single cylinder gate actuator deactivates multiple cylinder (intake and exhaust valves The two), such as all cylinders in cluster engine or different actuators can control all air inlets for the cylinder being deactivated Door deactivates, and all exhaust valves for the cylinder that another different actuator control is deactivated is deactivated.If will be appreciated that cylinder It is the cylinder that can not be deactivated of VDE engine, then the cylinder, which can not have any valve, deactivates actuator.Each start Machine cylinder may include valve control machanism described herein.Intake and exhaust valves are started when being deactivated in one or more Machine is maintained in its closed position during recycling, to prevent the stream of inlet and outlet cylinder 14.

Cylinder 14 can have compression ratio, and the compression ratio is to be in lower dead center (BDC) and top dead centre in piston 138 (TDC) ratio of volume when.In one example, the compression ratio is in the range of 9:1 to 10:1.However, making wherein With in some examples of different fuel, the compression ratio can be increased.For example, when using higher octane fuel or having higher The latent enthalpy of gasification fuel when it is possible that such case.If using directly injection, due to directly spraying to starting The influence of machine pinking, it is also possible to will increase compression ratio.

Each cylinder of engine 10 may include the spark plug 192 for incipient combustion.Ignition system 190 can select It selects and provides igniting via spark plug 192 to combustion chamber 14 in response to the spark advance signal from controller 12 under operation mode Spark.Spark timing can be adjusted based on engine operating condition and driver torque demand.It for example, can be for best The minimum spark of torque shifts to an earlier date (MBT) and is just providing spark at present so that engine power and efficiency maximize.Controller 12 can be with By engine operating condition, including engine speed, engine load and exhaust AFR, it is input in look-up table and for being inputted Engine operating condition and export corresponding MBT timing.In other examples, spark can be postponed from MBT, to accelerate engine The incidence of catalyst warmup or reduction combustion knock during starting.

In some instances, each cylinder of engine 10 can be configured with the one or more for providing it fuel Fuel injector.As non-limiting example, cylinder 14 is shown as including direct fuel injector 166 and port fuel injection Device 66.Fuel injector 166 and 66 may be configured to convey the fuel received from fuel system 8.Fuel system 8 can wrap Include one or more fuel tanks, petrolift and fuel rail.Fuel injector 166 is shown as being directly coupled to cylinder 14, so as to The pulse width of the signal received from controller 12 the proportionally direct fuel injection in the cylinder.Controller 12 can be with Port fuel injector 66 is controlled by similar mode.By this method, the offer of fuel injector 166 is considered as by fuel (being also known as " DI " below) is directly sprayed to the fuel injector in cylinder 14.Although Figure 1A, which is shown, is located in the one of cylinder 14 The fuel injector 166 of side, but fuel injector 166 can be alternatively positioned at the top of piston, such as in spark plug 192 Near position.When using alcohol-based fuel operation engine, due to the lower volatility of some alcohol-based fuels, such position can To increase mixing and burning.Alternatively, injector can be positioned at the inlet valve crown and nearby to increase mixing.It can be via combustion Fuel is transported to fuel injector 166 and 66 from the fuel tank of fuel system 8 with fuel rail by material pump.In addition, fuel tank can be with With the pressure transducer to the offer signal of controller 12.

Fuel injector 166 and 66 may be configured to the different fuel conduct that different relative quantities are received from fuel system 8 Fuel mixture, and be further configured to for this fuel mixture being directly injected in cylinder.For example, fuel injection Device 166 can receive alcohol fuel, and fuel injector 66 can receive gasoline.Furthermore, it is possible in the single loop of cylinder Different strokes during deliver fuel into cylinder 14.For example, can during previous exhaust stroke, in the induction stroke phase Between, and/or the fuel directly sprayed is at least partly conveyed during compression stroke.It can be in the previous circulation of cylinder reception fuel IC Intake Valve Closes after spray intake port injection fuel, and be ejected into always current cylinder circulation IC Intake Valve Closes be Only.Therefore, for single combustion incident (for example, carrying out burning fuel via spark ignition in the cylinder), can via any or Two injectors execute one or many injections of fuel in each circulation.It can be in the pressure being referred to as in shunt fuel injection Contracting stroke, induction stroke or its any appropriately combined period execute multiple DI injection.

Fuel tank in fuel system 8 can keep the fuel of different fuel type, such as with different fuel mass With the fuel of different fuel compositions.The difference may include different alcohol contents, different moisture, different octane, no Heat of gasification together, different fuel combinations and/or combination thereof etc..One example of the fuel with different heat of gasification includes vapour Oily the first fuel type and ethyl alcohol as with lower heat of gasification is as the second fuel type with biggish heat of gasification. In another example, engine can be used gasoline as the first fuel type and using containing alcohol fuel combination (for example, E85 (its ethyl alcohol for being about 85% and 15% gasoline) or M85 (its methanol for being about 85% and 15% gasoline)) conduct Second fuel type.Other feasible substances include the mixture of water, methanol, the mixture of alcohol and water, water and methanol, alcohol it is mixed Close object etc..In another example, two kinds of fuel can be the alcohol mixture with different alcohol compositions, wherein the first fuel-based Type can be the gasoline alcohol mixture with lower determining alcohol, such as E10 (its ethyl alcohol for being about 10%), and the second fuel-based Type can be the gasoline alcohol mixture with larger determining alcohol, such as E85 (its ethyl alcohol for being about 85%).In addition, the first combustion Material and the second fuel can also be different in terms of other fuel mass, such as the difference of temperature, viscosity, octane number etc..In addition, one A or two fuel tanks fuel characteristic may be refilled the daily variation of aspect due to fuel tank and frequently be changed.

Controller 12 is shown as microcomputer in figure 1A, and the microcomputer includes microprocessor unit 106, defeated Enter/output port 108, is shown as in this particular example for executable program (for example, executable instruction) and calibration value The electronic storage medium of non-transitory ROM chip 110, random access memory 112, not 114 sum number of dead-file According to bus.Controller 12 can receive various signals, including previously discussed signal from the sensor for being connected to engine 10, and And also comprise the measurement result of the air mass air mass flow (MAF) from mass air flow sensor 122；From connection To the engine coolant temperature (ECT) of the temperature sensor 116 of cooling cover 118；From the temperature for being connected to exhaust duct 135 The delivery temperature of sensor 158；Crankshaft position from the hall effect sensor 120 (or other types) for being connected to crankshaft 140 Confidence number；Throttle position from throttle position sensor 163；Signal UEGO from exhaust sensor 126, controller 12 can be used the signal UEGO to determine the air-fuel ratio of exhaust；Via the engine luggine of detonation sensor 90 (for example, quick-fried Shake)；And the absolute menifold pressure signal (MAP) from MAP sensor 124.It can be generated by controller 12 from crank position Engine rotational speed signal RPM.The menifold pressure signal MAP from MAP sensor 124 can be used to provide in inlet manifold The instruction of vacuum or pressure.Controller 12 can be inferred to engine temperature based on engine coolant temperature, and be based on The temperature of emission control system 178 is inferred to from 158 received signal of temperature sensor.

Controller 12 receives signal from the various sensors of Figure 1A, and is based on being received using the various actuators of Figure 1A Signal and the instruction that is stored on the memory of controller adjust power operation.For example, controller can pass through Actuating valve actuator 152 and 154 so that engine transitions be with VDE mode operation come deactivate select cylinder, such as about Fig. 5 It further describes.

As described above, Figure 1A only shows a cylinder of multiple cylinder engine.Therefore, each cylinder can be wrapped similarly Include its own one group of inlet valve/exhaust valve, fuel injector, spark plug etc..It will be appreciated that, engine 10 may include any conjunction Suitable number cylinder, including 2,3,4,5,6,8,10,12 or more cylinders.In addition, these cylinders Each of may include as Figure 1A with reference to described by cylinder 14 and some or all of various parts described.

During selected condition, such as in all torsion torque ability for not requesting engine 10, controller 12 can be selected One of the first air cylinder group or the second air cylinder group is selected to be deactivated and (be also known as VDE operation mode herein).In the VDE mode Period can deactivate the cylinder in selected air cylinder group by closing corresponding fuel injector 166 and 66.In addition, valve 150 and 156 can be deactivated and remain turned-off during one or more cycle of engine.Closing the cylinder being deactivated When fuel injector, remaining enabled cylinder continues in corresponding fuel injector and intake and exhaust valves activity and behaviour Burning is carried out in the case where work.In order to meet torque demand, controller is adjusted into the air capacity of movable cylinder.Cause This, in order to provide the equivalent engine that eight cylinder engine generates under 0.2 engine load and specific engine speed Torque, movable cylinder may be than when operating engine in all movable situation of all cylinders It is operated under the higher pressure of cylinder.This more demanding menifold pressure so as to cause reduced pump gas loss and increases Engine efficiency.In addition, being exposed to the lower active surface region (being only from moving cylinder) of burning reduces engine Heat waste, to increase the thermal efficiency of engine.

Referring now to Figure 1B, the plan view of engine 10 is shown.The front 10a of engine 10 may include frontal attachments (FEAD) (not shown) is driven, to provide power to alternating current generator, power steering system and air conditioning compressor.Show herein In example, engine 10 is shown and is in V8 configuration, there are eight cylinders that number is 1 to 8.It can be via four detonation sensor 90a-90d senses combustion knock.Detonation sensor is located in the paddy of engine cylinder body 9.In this example, via controller 12 are sampled the output of detonation sensor 90a during the knock window of cylinder 1 and 2.Exist via controller 12 The output of detonation sensor 90b is sampled during the knock window of cylinder 3 and 4.Starting via controller 12 The output of detonation sensor 90c is sampled during the knock window of machine cylinder 5 and 6.Via controller 12 in engine air The output of detonation sensor 90c is sampled during the knock window of cylinder 7 and 8.The multiple detonation sensor improves inspection The ability of the pinking of each cylinder is surveyed, this is because the decaying of the engine luggine as caused by pinking is with from pinking cylinder to quick-fried The distance of shake sensor increases and increases.

Referring now to Fig. 1 C, the front view of engine 10 is shown.Engine cylinder body 9 includes paddy 10b, and wherein engine is quick-fried Shake sensor 90a and 90c are installed to cylinder body 9.It is available good by installing detonation sensor 90a and 90c in paddy 10b Signal-to-noise ratio, allow to more reliably detect pinking.However, the installation site of detonation sensor 90a-90d can also permit Permitted that some sensors is allowed to observe some fuel injector control actions, and other sensors do not observe.Therefore, some cylinders Background noise level can be higher or lower than other cylinders.In addition, being opened near the knock window of another cylinder Or the distance for the fuel injector closed may will affect vibration and be transmitted to detonation sensor from the fuel injector of operation and be wanted Time quantum.Also, vibration from the longer time that fuel injector is transmitted to detonation sensor can permit it is described vibrate into Enter the knock window of cylinder.Therefore, detonation sensor position, firing order and engine configuration may also will affect some start The combustion knock background noise level of machine cylinder.

Therefore, the system of Figure 1A provides a kind of system for operating engine, comprising: modulated displacement engine, it is described Modulated displacement engine includes the port fuel injector and direct fuel injector for each cylinder；And control Device processed, the controller include executable instruction, the executable instruction be stored in non-transitory memory with: in all gas Cylinder all operates modulated displacement engine in the case where burning fuel；In all cylinders all in burning fuel when sequentially deactivate it is every The direct fuel injector of a cylinder；And from when in all cylinders all in burning fuel when deactivate at least one directly The detonation sensor output sampled when fuel injector generates the cylinder knocking background noise level of each cylinder.Institute The system of stating further includes the extra instruction for injecting fuel into cylinder via port fuel injector.The system It further include the extra instruction for spark timing to be indicated and adjusted in response to pinking.It is base the system comprises wherein pinking instruction In cylinder knocking background noise level.It include postponing spark timing the system comprises wherein adjustment spark timing.

Referring now to Fig. 2 to Figure 11, a kind of method for operating VDE engine is shown.It can be by the side of Fig. 2 to Figure 11 Method is included in the system of Figure 1A to Fig. 1 C and can be with the cooperative system.At least partly can be used as method 200 is deposited It stores up the executable instruction in non-transitory memory and is incorporated in the system of Figure 1A to Fig. 1 C.Furthermore it is possible to via transformation object The controller of the mode of operation of the device and actuator in the world is managed to execute the other parts of method 200.The controller can Power operation is adjusted with engine actuators using engine system.In addition, method 200 can input really from sensor Surely selected control parameter.

At 202, method 200 determines vehicle and engine operating condition via the sensor described in Figure 1A to Fig. 1 C. Method 200 can determine the operating condition of including but not limited to the following: engine speed, engine load, engine temperature, Environment temperature, fuel injection timing, detonation sensor output, fuel type, fuel octane number, engine location and engine are empty Air-flow.Method 200 proceeds to 204.

At 204, method 200 judges whether to meet for mapping fuel injector operation to combustion knock ambient noise Influence condition.In one example, when engine speed is within the specified range (for example, engine speed is greater than the first threshold It is worth speed and is less than second threshold speed) when, when engine load is within the specified range (for example, engine load is greater than first Threshold load and be less than second threshold load) and engine temperature be greater than threshold temperature when, meet condition.In other examples In, when meeting other vehicle working conditions, method 200 may determine that satisfaction is quick-fried to engine for mapping fuel injector operation Shake the condition of the influence of ambient noise.If method 200 is judged to meet quick-fried to engine for mapping fuel injector operation The condition of the influence of ambient noise is shaken, then answer is yes, and method 200 proceeds to 250.Otherwise, answer is no, and method 200 proceed to 206.

At 250, method 200 starts to map influence of the fuel injector operation to combustion knock background noise level. Method 200 maps combustion knock ambient noise according to the method for Fig. 3.Alternatively, the type being shown in FIG. 4 can be used Observer determine combustion knock ambient noise.After mapping combustion knock background noise level, method 200 is advanced To exiting.

At 206, method 200 judges whether to meet the condition for entering VDE mode.The spy that engine can operate in it Determining VDE mode, to can be engine distinctive.For example, in-line four cylinder four-stroke engine (I4) may include I4S (four A cylinder burns according to fixed mode), I2S (fire in each cycle of engine according to fixed mode by the two in four cylinders It burns (for example, cylinder 1 and cylinder 3 burn in the first cycle of engine；Cylinder 1 and cylinder 3 fire in the second cycle of engine Burn)) and I2R (the two in four cylinders is burnt according to rolling mode (for example, 1 He of cylinder in each cycle of engine Cylinder 3 burns in the first cycle of engine；Cylinder 2 and cylinder 4 burn in the second cycle of engine；Cylinder 1 and cylinder 3 exist Burn in third cycle of engine)).On the other hand, V eight cylinder engine can be according to following mode combustion: eight cylinder modes (V8S), tetra- fixed mode of V (V4S), bis- rolling mode of tetra- rolling mode of V (V4R), bis- fixed mode of V (V2S) and V (V2R), six fixed mode of V (V6S), six rolling mode of V (V6R).

Fixed VDE mode be wherein during each cycle of engine identical moving cylinder (for example, the hair of burning fuel Motivation cylinder) it is movable mode.Rolling VDE mode is activity wherein different during two or more cycle of engine Cylinder is movable mode.Furthermore, it is possible to describe VDE operation mode according to cylinder density.For example, 4 can be multiplied according to 3 Cylinder density operates eight cylinder engine, wherein three cylinder compression strokes of the engine in every four cylinder compression strokes Middle igniting (for example, burning fuel).Similarly, when 2 multiply and operate engine under 4 cylinder density, engine is in every four gas Two cylinder compression midstroke fire in cylinder compression stroke.Available VDE mode can be in cylinder just in burning fuel In the case of the mode that is started, and available VDE mode can be made in response to vehicle working condition and available or unavailable.Citing For, if engine temperature is less than 10 DEG C, only V8 mode can be available.However, if engine temperature is greater than 30 DEG C, then V4S, V6S, V4R and V6R can be available.

The VDE entry condition that wherein can star one or more VDE modes may include (but being not limited to) engine temperature Degree is greater than threshold temperature, operator demand's torque is greater than threshold torque, engine speed is greater than threshold rotation rate and car speed Greater than threshold velocity.Furthermore, it is possible to triggered via the variation of operating condition into VDE mode, the variation of the operating condition be, for example, (but It is not limited to) variation of engine speed, the variation of engine load, the variation of operator demand's torque, the change of engine temperature Change.If method 200, which is judged to exist, allows to start VDE mode or enter the condition of VDE, answer is yes, and method 200 Proceed to 208.Otherwise, answer is no, and method 200 proceeds to 260.

At 208, method 200 selected based on vehicle working condition include cylinder spark density and cylinder ignition mode VDE Mode.However, if operating condition does not indicate that selection includes the serviceability of the new VDE mode of cylinder spark density and ignition mode, So maintain the VDE mode previously selected, the previously selected VDE mode be during previous cycle of engine 208 or The VDE mode selected at 212.Method 200 can configure multiple unique VDE of (for example, I4, V6, V8) from specific engines Selection includes the VDE mode of cylinder density and ignition mode in mode.In one example, method 200 from can be used in response to Vehicle working condition and VDE mode is selected in multiple unique VDE modes for entering, the vehicle working condition including but not limited to drives Member demand torque, engine speed, car speed, active transmission gear, catalyst temperature, individual temperature of cylinder, engine Noise and vibration limitation and engine temperature.For example, method 200 can choose can in specified engine speed and Meet the VDE mould of the moving cylinder including minimal number of operator demand's torque and engine noise and vibration limitation under load Formula.The selection can be executed via state machine or logic.After having selected unique VDE mode, method 200 is proceeded to 210。

In some instances, basic fuel jet mode can be with the VDE mode selected at 208.For example, may be used To inject fuel into each cylinder via single DI injection, PFI and DI injection, multiple DI injection, PFI and multiple DI injection. It in one example, can be from memory search basis or the fuel injection mode of default, and base when selecting VDE mode Plinth fuel injection mode can become with engine speed and engine load and other control parameters.

At 210, method 200 judges whether the VDE mode selected at 208 changes compared with the VDE mode being currently up Become combustion knock background noise level.For example, if selected VDE mode is wherein in the VDE mode being currently up Order fuel injector is closed during the combustion knock window for the cylinder that period non-order fuel injector is closed, then method 200 may determine that engine can be changed by ordering the fuel injector of the cylinder to be closed during the selected VDE mode Pinking background noise level.Similarly, if selected VDE mode is not being ordered during the VDE mode being currently up wherein Order fuel injector is opened during the combustion knock window for the cylinder that fuel injector is opened, then method 200 can be sentenced The disconnected fuel injector unlatching for ordering the cylinder during the selected VDE mode out can change combustion knock background and make an uproar Sound is horizontal.If method 200 judges the engine background from 208 selected VDE mode and the VDE mode being currently up Noise level is compared to combustion knock background noise level is changed, then answer is yes, and method 200 proceeds to 212.It is no Then, answer is no, and method 200 proceeds to 270.Each cylinder knocking window of the assessment of method 200 during cylinder cycle Combustion knock background noise level.

Just assessed during scheduled crankshaft section during each cycle of engine of each cylinder of burning fuel The existence or non-existence of combustion knock.Therefore, eight cylinder engine includes eight at each cycle of engine (for example, two turns) Knock window, and four includes four knock windows in each cycle of engine.In one example, engine The combustion knock window of cylinder can cross over from five crankshaft degree after top dead centre compression stroke to top dead centre compression stroke it The crankshaft section of 60 crankshaft degree afterwards.Of course, it is possible to adjust the combustion knock window of cylinder according to other crankshaft angles Crankshaft degree range.

At 270, method 200 maintains the VDE mode selected at 208 (for example, cylinder spark density, cylinder spark mould Formula and fixation or rolling strategy) or at 212 select VDE mode.In addition, the starting of method 200 is examined at 208 from memory The fuel injection mode on basis or default that rope arrives or being selected at 212.The input of movable cylinder is also stored in by method 200 In list in controller storage (RAM), allow to track the VDE mode of nearest starting.Method 200 proceeds to 214.

At 212, method 200 adjusts cylinder density, ignition mode and/or combustion according to the VDE mode selected at 208 Jet mode is expected, to reduce the combustion knock ambient noise water for changing each combustion knock window during cylinder cycle A possibility that flat.Cylinder density, ignition mode and/or fuel injection are adjusted according to the method for Fig. 7.Method 200 will also be movable Cylinder input be stored in the list in controller storage (RAM), allow to track the VDE mode of nearest starting. After having adjusted cylinder density, ignition mode and/or fuel injection mode, method 200 proceeds to 214.

In addition, wherein present engine circulation knock window during occur fuel injector control action and then It, can be quick-fried by specific cylinder during the condition for not arranging the control action of generation fuel injector during selected VDE mode The combustion knock background noise level for shaking window is stored to controller storage, so that the combustion knock ambient noise water It is flat to be retrieved and the pinking ambient noise water in the control action for restarting fuel injector as specific cylinder It is flat.For example, if all cylinders present engine circulation in all activity and in the knock window of cylinder numbers three The background knock noise level determined in mouthful is 0.5 volt, then in the selected VDE mode of starting not during cycle of engine The fuel injector closed during the knock window of cylinder numbers three during present engine circulation is closed (for example, cylinder The fuel injector of number six) because the fuel injector of cylinder numbers six is deactivated, cylinder numbers six can will started The pinking background noise level of cylinder numbers three when fuel injector is stored in controller storage.If restarting The fuel injector that cylinder numbers six are restarted when all cylinders, then can be by the combustion knock background of cylinder numbers three Noise level is adjusted to 0.5 volt.By this method, engine mode is being switched back into determining combustion knock background noise level Mode when, combustion knock background noise level can be reset to previously determined value.Therefore, it is possible to reduce to engine The adjustment of the combustion knock background noise level of knock window, thus a possibility that reducing wrong pinking instruction.

At 214, method 200 deactivates direct port fuel injector and the port fuel injection for the cylinder being deactivated Device is to provide and start the VDE mode selected at 208 or 212.In addition, method 200 deactivates the VDE mould selected not at 208 The engine intake valve and exhaust valve of the cylinder of burning are executed under formula.By deactivating direct fuel injector and port fuel spray Emitter, can be to avoid may be transferred to engine and detect in the knock window of cylinder due to closing fuel injector Noise, so that establishment does not include the engine background noise level of the noise from the fuel injector being deactivated and vibration.Side It is movable cylinder that method 200, which also starts under selected VDE mode,.The input of movable cylinder is also stored in control by method 200 In list in device memory (RAM), allow to track the VDE mode of nearest starting.Method 200 proceeds to 216.

At 216, method 200 determines whether to enter selected VDE mode based on combustion knock background noise level. Method 200 determines whether to enter selected VDE mode according to the method for Fig. 6.Method 200 proceeds to 218.

At 218, method 200 assesses whether to indicate for specific cylinder based on combustion knock background noise level Pinking.In one example, method 200 calculates the knock intensity value of specific cylinder in the following manner: in specific cylinder Knock window during the output of detonation sensor integrated, and export the detonation sensor by integration divided by institute State the combustion knock background noise level by integration of specific cylinder.It should be noted that can knock window be used for The output of detonation sensor is integrated during the knock window for determining the combustion knock background noise level by integration Different piece during to for determine pinking detonation sensor export integrate.If knock intensity value is more than threshold value (for example, 1 volt) then indicating the pinking of specific cylinder, and makes the spark timing of specific cylinder postpone predetermined amount.Specific cylinder Spark be delayed by, and then make spark timing towards MBT (the minimum spark for optimal engine torque shifts to an earlier date) spark Timing back shifts to an earlier date.For example, if the knock intensity value of cylinder numbers one is more than threshold level, cylinder numbers are indicated One pinking, and the spark timing of cylinder numbers one is made to postpone five crankshaft degree.Cylinder numbers one can be made based on pinking working as Spark timing delay when ten seconds in so that the spark timing of cylinder numbers one is shifted to an earlier date five crankshaft degree.If not indicating pinking, that The spark timing of cylinder is kept under its requested or basic timing (for example, MBT timing).It can come in this way Determine the pinking of each cylinder.

For detecting the engine of the pinking in specific engines cylinder applied by being retrieved from controller storage Pinking background noise level.Pre- timing can have been assigned in VDE mode in engine after being recently entered current VDE mode Combustion knock background noise level is updated and is corrected after the cycle of engine of the area of a room or predetermined amount.For example, Method 200 can retrieve the background noise level of specific cylinder for the following conditions: when from the associated fuel of different cylinders The control action of injector (for example, when being activated from the associated fuel injector of different cylinders) ought open again (for example, working as engine operation mode from one or more cylinder quilts when the dynamic cylinder with the fuel injector being deactivated Deactivate when changing into all cylinders and being activated) condition during when occurring in the knock window of specific cylinder.Method 300 can also retrieve the background noise level of specific cylinder for the following conditions: spray when from the associated fuel of different cylinders The control action of emitter (for example, when not being activated from the associated fuel injector of different cylinders) is not working as cylinder (for example, when engine operation mode changes into one or more from all activities of all cylinders when with the fuel injector being deactivated When a cylinder is deactivated, wherein not to the cylinder injection fuel being deactivated) condition during in the knock window of specific cylinder When generation.After engine comes into current VDE operation mode recently, the background under present engine operating condition can be used Noise level updates the background noise level of the cylinder being activated.The engine air being activated can be adjusted in this way The background noise level of each of cylinder.The combustion knock ambient noise in controller storage is had stored in application After existence or non-existence of the level to determine combustion knock, and engine spark is being adjusted for combustion knock instruction After flower timing, method 200, which proceeds to, to be exited.

At 260, method 200 judges whether engine is in VDE mode at present and whether meets VDE exit criteria. Method 200 can be currently to judge engine based on described combustion knock background noise level in the method for figure 6 It is no to be operated under VDE mode.In addition, method 200 can change into the value except VDE mode range in operator demand's torque In the case of judge to meet VDE exit criteria.In addition, method 200 can be in the case where engine be in idling and/or in vehicle Speed be less than threshold velocity in the case where judge that there are VDE exit criterias.If method 200 judges that meeting VDE moves back Condition out, then answer is yes, and method 200 proceeds to 262.Otherwise, answer is no, and method 200 proceeds to 265.

At 262, the judgement of method 200 exits VDE mode and whether can change combustion knock back into full cylinder mode Scape noise level.In one example, method 200 can be in fuel injector wherein in the nearest previous cycle of engine phase Between do not order close fuel injector knock window in be ordered to be closed (for example, fuel injector control action) in the case where Judge that combustion knock background noise level can change.Similarly, method 200 can be in fuel injector wherein nearest Previous cycle of engine during do not order open fuel injector knock window in be commanded in the case where judge Combustion knock background noise level can change.Fuel injector control action (for example, do not order closing fuel previously wherein Order fuel injector is closed in the combustion knock window of injector) in combustion knock window (for example, cylinder numbers two Knock window) in change can indicate the variation of combustion knock background noise level.If method 200 is judged to enter complete Moving cylinder mode will lead to the variation of combustion knock background noise level, then answer is yes, and method 200 proceeds to 264.Otherwise, answer is no, and method 200 proceeds to 265.

At 264, method 200 adjusts fuel injection mode according to full cylinder mode, is changed with reducing in gas A possibility that combustion knock background noise level of each combustion knock window during cylinder circulation.According to the method for Fig. 7 To adjust fuel injection.After having adjusted fuel injection mode, method 200 proceeds to 265.

At 265, method 200 starts the poppet of all cylinders and cylinder.Also on the basis of fuel injector Starting fluid injector under operation mode, and spark is supplied to all cylinders.Starting all cylinders Later, method 200 proceeds to 218.

In this way, it is possible to adjust cylinder density, fuel injection timing and ignition mode to mitigate to engine The change of pinking background noise level.Furthermore, it is possible to by being carried on the back for the known combustion knock of specific VDE and non-VDE mode Scape noise level is stored allows to reduce the instruction of the wrong pinking after engine mode variation to controller storage A possibility that possibility or omission pinking.

It shall yet further be noted that the method for Fig. 2 can enter whether selected VDE mode will cause cylinder by determining Combustion knock background noise level change change the fuel injector timing of selected VDE mode, cylinder spark mode and Cylinder density.If it is determined that the variation of combustion knock background noise level, then movement can be taken so that new when entering VDE mode when change the combustion knock background noise level of less cylinder.However, in alternative exemplary, Method 200 can actually enter selected VDE mode, and then observe the variation of combustion knock background noise level In the case of make adjustment described herein.Therefore, selected VDE mode can be started at 208, and method 200 can be 210 Place judges whether started VDE mode changes combustion knock background noise level.Then, combustion knock is being observed Background noise level can take identical mitigation to act in the case where changing.

Referring now to Fig. 3, the side for determining the combustion knock background noise level of modulated displacement engine is shown Method.The method includes determining combustion knock ambient noise when using different types of fuel injection (for example, DI and PFI) It is horizontal.

At 302, method 300 selects cylinder to carry out the mapping of combustion knock background noise level.In one example, side Method 300 starts from selecting the first cylinder in the firing order of engine, and in the firing order for having had mapped engine In first cylinder combustion knock background noise level after sequentially select firing order in other cylinders.It lifts For example, for the eight cylinder engine with firing order 1-3-7-2-6-5-4-8, method 300 selects cylinder numbers first One carries out the mapping of combustion knock background noise level, and then method 300 selects cylinder numbers three to carry out combustion knock back The mapping of scape noise level, and the rest may be inferred.After having selected cylinder to carry out the mapping of combustion knock background noise level, method 300 proceed to 304.

At 304, method 300 retrieves the knock window timing of selected cylinder.Method 300 can be examined from controller storage Rope knock window timing.In one example, the knock window timing of selected cylinder is the top dead centre pressure from the selected cylinder 60 degree after five crankshaft degree to the top dead centre compression stroke of the selected cylinder after contracting stroke.In other examples, Knock window can have other timings (for example, assessing during the crankshaft section of the knock window of selected cylinder described selected The pinking of cylinder and pinking ambient noise).Method 300 proceeds to 306.

At 306, there is the identification of method 300 fuel injection control Chong Die with the knock window timing of selected cylinder to act Other cylinders of timing.It is also based on identity of the selected cylinder from other cylinders of memory search. Alternatively, the injection of each cylinder can be started to (SOI) timing (for example, crankshaft angles) and injection ending timing (EOI) just When at 304 determine selected combustion knock window timing be compared.In addition, in some instances, can determine Valve-closing event that may be Chong Die with the knock window of selected cylinder.If the SOI timing of the fuel injector of cylinder or EOI Timing is in selected combustion knock window, then the injector of other cylinders is identified as having and the choosing Determine the timing of knock window overlapping.If the SOI or EOI of fuel injector occur simultaneously with selected combustion knock window, Fuel injector control action (for example, opening or closing fuel injector) at so SOI or EOI may will affect selected Combustion knock window during determine combustion knock background noise level.It is identifying with quick-fried with selected engine Shake windows overlay control action or the control action occurred simultaneously with selected combustion knock window fuel injector it Afterwards, method 300 proceeds to 307.

At 307, method 300 operates under all activities of all cylinders and all movable situations of fuel injector starts Machine.Method 300 determines the combustion knock ambient noise of all cylinders in all cylinders and all movable all fuel injectors It is horizontal.These background noise levels indicate all cylinders and all movable background noise level of injector.By the ambient noise Controller storage (for example, RAM) is arrived in level storage.Method 300 proceeds to 308.

At 308, starting to 300 method choice of method and deactivating has and selected combustion knock windows overlay The fuel injector of control action.For example, if closing cylinder numbers six during the knock window of cylinder numbers three DI injector, then cylinder numbers six the normal operating of DI injector (for example, being closed during the knock window of cylinder numbers three Close) in the case where determine cylinder numbers three combustion knock background noise level.Then by engine background noise at 310 Level storage to controller storage as in cylinder numbers six just in burning fuel when cylinder numbers three engine background Noise level.Next, the DI fuel injector of deactivated cylinder number six, so that in the combustion knock window of cylinder numbers three Period is not related to the DI fuel injector for closing cylinder numbers six.It is then determined that the combustion knock ambient noise water of cylinder numbers three It is flat.At 310 by this combustion knock background noise level of cylinder numbers three be stored in controller storage as in The background noise level of cylinder numbers three in the case that the DI injector of cylinder numbers three is deactivated when operation engine.It can be with It is determined by similar mode with the PFI with the simultaneous control action of combustion knock window of selected cylinder numbers The combustion knock background noise level of injection and it is stored to controller storage.

When deactivating the combustion with control action or vibration caused by the control action in the knock window as selecting cylinder When material ejector (for example, DI injector) is with the combustion knock background noise level of the determination selected cylinder, by gas Cylinder is injected fuel into via the second fuel injector (for example, port fuel injector) with the combustion being deactivated during recycling The burning in cylinder is maintained in the cylinder of material ejector.This allows engine continuation while meeting operator demand's torque Operation and burning fuel under stoichiometric air-fuel ratio, so that determining the combustion knock ambient noise water of each cylinder It is flat vehicle occupant not allowed to notice very much.On the contrary, being moved when deactivating with the control in the knock window by selecting cylinder The fuel injector (for example, passage injector) of control action or vibration caused by work is with the hair of the determination selected cylinder When engine knock background noise level, by during cylinder cycle via the second fuel injector (for example, DI fuel injection Device) it injects fuel into maintaining the burning in cylinder in the cylinder of fuel injector being deactivated.Wherein fuel injection The air-fuel ratio for the cylinder that device is deactivated is maintained at its desired value (for example, stoichiometry), even if in different cycle of engine At least one of period closing and the fuel injector for opening cylinder are also in this way, to establish the engine background of selected cylinder Noise level.

In one example, occur via low-pass filtering and during the combustion knock window of selected cylinder by whole The engine knock sensors through overcorrection closed export to determine combustion knock background noise level.Furthermore, it is possible to via Average value of the infinite impulse response filter from the past combustion knock background noise level of the predetermined number of selected cylinder To construct current combustion knock background noise level.After the background noise level for determining selected cylinder, before method 300 Enter 310.

At 310, the background noise level of selected cylinder is saved in controller storage by method 300.Method 300 control actions that can store the associated fuel injector of Yu Yu difference cylinder are sent out in the knock window of selected cylinder The background of selected cylinder under conditions of when (for example, when fuel injector associated with the difference cylinder is activated) raw Noise level.Method 300 may be stored in the control action in fuel injector associated with difference cylinder not selected Item when (for example, when fuel injector associated with the difference cylinder is not activated) generation in the knock window of cylinder The background noise level of selected cylinder under part.Method 300, which proceeds to, to be exited.

In this way, it is possible to determine combustion knock background noise level and apply the combustion knock ambient noise Level determines the existence or non-existence of combustion knock.Estimation to combustion knock background noise level may include coming from The noise of direct fuel injector and port fuel injector.

Referring now to Fig. 4, the exemplary observer for estimating combustion knock ambient noise is shown.Block diagram 400 wraps It includes to summing junction 408 and the observer section 401 of output is provided.The output of engine knock sensors is being input into low-pass filtering Through overcorrection and integration before device 402.The knock sensor signal for being input to low-pass filter 402 is in cylinder knocking window phase Between the output of detonation sensor that occurs.Cylinder knocking window is opened in the scheduled crankshaft section phase of the pinking of assessment cylinder Between allow detonation sensor be output to low-pass filter.Each cylinder has the knock window being shown in FIG. 5.Low-pass filter 402 have the cut frequency based on the filter time constant (for example, scalar numeric value) for being input to low-pass filter 402.Pinking The output of detonation sensor during window depends on engine speed, fuel injection timing and duration of charge, because For fuel injector can be opened and closed during knock window.Using the output of low-pass filter 402 as without adjustment Combustion knock ambient noise reference levels be relayed to summing junction 408.The output of summing junction 408 is the engine being adjusted Pinking background noise level.

Observer 401 receives the combustion knock ambient noise estimated by following equation with reference to estimation:

INTKNK_DELTA_EST [icyl]=lookup_3d (INTKNK_DELTA_INJ (icyl, rpm)

Wherein INTKNK_DELTA_EST is the pinking ambient noise reference estimation by integration, and icyl is to it using institute The pinking ambient noise by integration is stated with reference to the cylinder of estimation；Lookup_3d is with engine speed and to described in its application The cylinder of pinking ambient noise reference by integration and the three dimensional lookup table of the value being determined empirically become.By INTKNK_ The value of DELTA_EST is input to low-pass filter 404.Low-pass filter is subtracted from the value of INTKNK_DELTA_EST at 410 404 output, and result is input in summing junction 408.Observer 401 starts to what is determined from engine knock sensors Machine pinking background noise level provides forward feedback correction.If fuel injector control action (for example, opening or closing) is starting Except machine pinking ambient noise window, then INTKNK_DELTA_EST=0.

Referring now to Fig. 5, the positive time series 500 for showing exemplary engine pinking ambient noise window timing is shown. Illustrated timing is for the eight cylinder engine with firing order 1-3-7-2-6-5-4-8.The engine is that have The four-stroke engine of the circulation of 720 crankshaft degree.Engine crankshaft degree is positioned along horizontal axis, and zero degree indicates cylinder numbers One top dead centre compression stroke.Along eight cylinders of vertical axis label.

The combustion knock window of cylinder numbers one is indicated by slanted bar 502.By with the label pair along vertical axis Quasi- similar slanted bar (504-516) indicates the knock window of remaining cylinder (2 to 8).Solid bars 530 indicate that cylinder is compiled Numbers two DI fuel injector opens section.When solid bars 530 are invisible, the DI fuel injector of cylinder numbers two is to close 's.The DI fuel injector of cylinder numbers two is opened in the left side of solid bars 530, and is closed on the right side of solid bars 530.Pass through Similar solid bars (532-544) indicate the DI fuel injection of remaining cylinder (2 to 8), and they follow with it is solid The identical agreement of item 530.Fuel injector 530-544 is respectively and corresponding to the fuel injector item listed along vertical axis Cylinder alignment.

The stroke of cylinder numbers one is indicated by horizontal line 550.Alphabetical p, e, i and c identification is associated with cylinder numbers one Acting (p) stroke, exhaust (e) stroke, air inlet (i) stroke and compression (c) stroke.Identify that other start by similar mode The stroke of machine cylinder.

Fig. 5 further include describe a cylinder DI fuel injection and another cylinder combustion knock background noise level it Between relationship table 501, as according to illustrated by sequence 500.Table 501 includes what instruction was burnt to which cylinder injection fuel First label.According to the firing order 1-3-7-2-6-5-4-8 arrangement cylinder number of engine.Second label instruction by To the knock window for the cylinder for carrying out fuel injection influence to the cylinder of burning.Table 501 show the knock window of cylinder 5 by The fuel of spray combustion influences (cylinder 1 is located at 5 top of cylinder in the table) in cylinder 1.The quick-fried of cylinder 4 is also shown in table 501 Shake window is influenced by the fuel of the spray combustion in cylinder 3, and the rest may be inferred.Therefore, one is being injected fuel directly into When cylinder, this may will affect the combustion knock background as the cylinder of three cylinders after the burning order decline of engine Noise level.Timing between port fuel injector and cylinder knocking window and mutually can be described by similar mode Relationship.

Thus, it can be observed that the opening and closing of the DI fuel injector of cylinder numbers two are in the quick-fried of cylinder numbers one Occur during shake window.This timed relationship is indicated by arrow 590.DI injector and engine are indicated by arrow 591-597 Similarity relation between knock window.Therefore, when starting DI injector, the opening and closing of the DI injector can increase The combustion knock background noise level of cylinder.When not starting DI injector, the hair of cylinder can reduce Motivation background noise level.

Referring now to Fig. 6, show for being diagnosed based on combustion knock background noise level whether under VDE mode The method for deactivating cylinder.The combustion knock background noise level of cylinder can change, this is depended on true Whether fuel injector control action (example is taken during combustion knock window when determining combustion knock background noise level Such as, fuel injector is opened or closed).If playing on or off during crankshaft section when opening the knock window of specific cylinder Fuel injector is closed, then the combustion knock background noise level of specific engines cylinder may be due to by opening or closing Noise caused by fuel injector increases with vibration.However, if when opening the knock window of specific cylinder in crankshaft area Between during do not open or close fuel injector, then the combustion knock background noise level of specific engines cylinder may Reduce since there is no noise and vibration from fuel injector.

At 602, method 600 selects cylinder to determine combustion knock background noise level.In one example, method 600 start from selecting cylinder based on engine location.Selected cylinder is defining in advance in the knock window for defining cylinder Crankshaft angles cylinder, or closest to its knock window for defining cylinder the crankshaft angles defined in advance rather than be in gas The cylinder of crankshaft angles in the knock window of cylinder.For example, if engine is in the top dead centre compression of cylinder numbers one The knock window of ten degree after stroke and cylinder numbers one is from five degree after the top dead centre compression stroke of cylinder numbers one 60 degree after to top dead centre compression stroke, then selection cylinder numbers one, because engine is in the quick-fried of cylinder numbers one It shakes in window.Cylinder is being selected come after determining combustion knock background noise level, method 600 proceeds to 604.

At 604, method 600 retrieves the knock window timing of selected cylinder.Method 600 can be examined from controller storage Rope knock window timing.In one example, the knock window timing of selected cylinder is the top dead centre pressure from the selected cylinder 60 degree after five crankshaft degree to the top dead centre compression stroke of the selected cylinder after contracting stroke.In other examples, Knock window can have other timings (for example, assessing during the crankshaft section of the knock window of selected cylinder described selected The pinking of cylinder and pinking ambient noise).Method 600 proceeds to 606.

At 606, there is the identification of method 600 fuel injection control Chong Die with the knock window timing of selected cylinder to act Other cylinders of timing.It is also based on identity of the selected cylinder from other cylinders of memory search. Alternatively, the injection of each cylinder can be started to (SOI) timing (for example, crankshaft angles) and injection ending timing (EOI) just When at 604 determine selected combustion knock window timing be compared.If the SOI of the fuel injector of cylinder is just When or EOI timing be in selected combustion knock window, then the injector of other cylinders is identified as having The timing Chong Die with the selected knock window.If the SOI or EOI of fuel injector and selected combustion knock window are same When occur, then the fuel injector control action (for example, opening or closing fuel injector) at SOI or EOI may shadow Ring the combustion knock background noise level determined during selected combustion knock window.Identify have with it is selected The fuel of the control action of combustion knock windows overlay or the control action occurred simultaneously with selected combustion knock window After injector, method 600 proceeds to 608.

At 608, method 600 judges whether the 208 or 212 selected VDE mode from Fig. 2 influences to select at 602 The operation for the cylinder selected determines combustion knock ambient noise.Due to selected VDE mode in present engine circulation Newly deactivated cylinder may will affect the combustion knock ambient noise of the selected cylinder for selecting determining combustion knock ambient noise It is horizontal.For example, if the DI injector of cylinder numbers two in the activity of cylinder numbers two in the knock window of cylinder numbers one Closed in mouthful, and due to selected VDE mode and during current cylinder circulation inactive cylinder numbers two DI injector, So method 600 may determine that the selected VDE mode influences to be selected to determine combustion knock background noise level The combustion knock background noise level of cylinder (for example, cylinder numbers one).If method 600 judges the selected VDE Mode influences determine the combustion knock ambient noise for being selected to determine the cylinder of combustion knock background noise level Level, then answer is yes, and method 600 proceeds to 610.Otherwise, answer is no, and method 600 proceeds to 620.

At 620, method 600 determines the combustion knock background noise level of the cylinder selected at 602 and will hair Engine knock background noise level is stored to controller storage.Combustion knock background noise level, which is stored in, to be passed through The memory location that the VDE mode (including all cylinder activity patterns) of selected cylinder numbers, current selected is quoted In.In addition, combustion knock background noise level is stored as an identified upper combustion knock background noise level.It can To determine combustion knock background noise level via a part for selecting the knock window of cylinder is integrated.Method 600 proceed to and exit.

At 610, method 600 determines the combustion knock background noise level of the cylinder selected at 602 and will hair Engine knock background noise level is stored to controller storage.Combustion knock background noise level, which is stored in, to be passed through The memory location that the VDE mode (including all cylinder activity patterns) of selected cylinder numbers, current selected is quoted In.In addition, combustion knock background noise level is stored as identified new combustion knock background noise level.Method 600 proceed to 612.

At 612, method 600 judges that a upper combustion knock background noise level is made an uproar with new combustion knock background Whether the absolute value of the difference (ABS) between sound level is more than threshold level.If it is then answer is yes, and method 600 is advanced To 614.Otherwise, answer is no, and method 600 proceeds to 616.It is answer instruction VDE mode with ordered variation, because The variation of fuel injector control action is identified.No answer instruction VDE mode does not have ordered variation, because still Do not changed by combustion knock background noise level to identify the fuel injector control action observed.

At 616, method 600 indicates that VDE mode does not change as expected.Therefore, one or more fuel sprays can be indicated The operation of emitter has deteriorated.Furthermore, it is possible in response to combustion knock background noise level inexpectancy respond and deactivate one or Multiple VDE modes.It can be deactivated in response to VDE mode to adjust fuel injector timing and spark timing.For example, when When so that engine is changed into full moving cylinder from VDE mode due to deactivated one or more VDE modes, it can reduce and be ejected into The amount of the fuel of cylinder.In addition, can be by the spark timing of cylinder when starting all cylinders In advance.These variations can be attributed to the hair when (for example, all cylinders are all movable) operation engine under full cylinder mode The relatively underload of motivation cylinder.Method 600 can limit the number of available VDE mode, and it is bad to indicate that there are VDE modes Change.For example, when determining VDE mode deterioration, method 600 can forbid V6S mode and V4S mode in V8 engine. A possibility that VDE mode being limited to reduce engine degradation and engine emission deterioration.Method 600, which proceeds to, moves back Out.

At 614, method 600 indicates that VDE mode changes as expected.Therefore, method 600 can signal Motivation operates as expected.Method 600, which proceeds to, to be exited.

By this method, method 600 can determine the existence or non-existence of VDE mode deterioration.VDE mode deterioration can be based on Combustion knock background noise level determines.In addition, other VDE modes deterioration method can be combined with the method for Fig. 6 and Improve engine diagnostic.

Referring now to Fig. 7 to Figure 11, show for adjustment VDE mode, injection there are VDE mode variation Device timing and fuel injector mode are to provide the method for more consistent combustion knock background noise level.Change in VDE mode During change, the sum of active engine cylinder can be increasedd or decreased.If deactivated cylinder, some moving cylinders start Machine pinking background noise level can be deactivated due to the fuel injector for the cylinder being deactivated and be reduced.Because cylinder The control action (for example, opening and closing) of fuel injector may occur (such as in the combustion knock window of another cylinder Shown in Fig. 5), so while VDE mode variation and pinking in another cylinder may be changed by starting or deactivating some cylinders The combustion knock background noise level of other cylinders and determination is directed to during window.Accordingly, it may be desirable to modify VDE mode, Fuel injector timing and/or fuel injection mode are to reduce the combustion knock back due to caused by VDE mode variation The variation of scape noise.Although method 700 shows for judging whether that selected VDE mode can be modified and maintains combustion knock The certain order of background noise level, but can rearrange whether judge specified conditions (for example, SOI timing etc.) when needed Existing order.Of course, it is possible to which all activities of all cylinders are considered as VDE mode.

At 702, method 700 judges whether there is the alternative cylinder spark mode that can be used for starting, because of current choosing Fixed VDE may will affect combustion knock background noise level.Method 700 can be retrieved available from controller storage VDE mode, and by the gas of the cylinder spark mode of the VDE mode of current selected and current unselected available VDE mode Cylinder ignition mode is compared.Available alternative cylinder spark mode is the quilt for the VDE mode same population for including and selecting Start the VDE mode of cylinder, but alternative available VDE mode there must also be the igniting different from the VDE mode selected time Sequence.For example, if the VDE mode of the current selected of the V8 engine with firing order 1-3-7-2-6-5-4-8 is tool There is the V4S mode of firing order 1-7-6-4 and the V4S mode with firing order 3-2-5-8 can be used, then answer is yes, and Method 700 proceeds to the 802 of Fig. 8.Otherwise, if alternative cylinder spark mode is unavailable, answer is no, and method 700 proceed to 704.

At 704, method 700 judges whether the VDE mode starting shunt fuel injection mode for current selected.Point Streaming jet mode is wherein to provide the mode for being more than single fuel injection to single cylinder via single fuel injector.Citing For, for selected VDE mode, direct fuel injector can spray once during induction stroke, and rush in compression Second of injection during journey.Method 700 by fuel injection this generic operation or scheduling be determined as shunt jet mode.Such as Fruit method 700, which is determined, to be started for current VDE mode or enables shunt fuel injection, then answer is yes, and before method 700 Enter the 902 of Fig. 9.Otherwise, answer is no, and method 700 proceeds to 706.

At 706, method 700 judges whether that the injection of the VDE mode of adjustable current selected starts (SOI) timing (for example, engine crank angle).The injection of cylinder starts the opening fuel injector (PFI during the circulation that timing is cylinder Or DI) injector locating for earliest crankshaft angles, and SOI timing can be adjusted in response to engine operating condition.Currently The earliest SOI of port fuel injector during cylinder cycle is in inlet valve in the upper one previous circulation phase of cylinder Between the crankshaft angles closed.The earliest SOI of the direct fuel injector of same cylinder can be upper one of cylinder and previous follow The exhaust valve closing (EVC) of ring.Therefore, it can permit PFI and start from the SOI injecting time more much earlier than DI.In addition, it is also possible to In the presence of other constraint conditions to SOI injecting time.For example, the SOI of DI injector can be constrained in top dead centre After induction stroke, to ensure that most of DI fuel stay in cylinder.Current choosing can be retrieved from controller storage The PFI injecting time and DI injecting time of fixed VDE mode and earliest PFI injecting time and DI injecting time.If worked as The DI injecting time of preceding selected VDE mode is later than earliest DI injecting time, then DI can be sprayed SOI time advance. It similarly, can be by PFI if the PFI injecting time of the VDE mode of current selected is later than earliest PFI injecting time Spray SOI time advance.If method 700 judges whether that the SOI timing of PFI injector and DI injector can be adjusted to early In the time of the basic SOI timing of the VDE mode of current selected, answer is yes, and method 700 proceeds to the 740 of Figure 10.It is no Then, answer is no, and method 700 proceeds to 708.

At 708, when the selected VDE mode of starting will increase the combustion knock background noise level of cylinder When, method 700 judge whether can only to start on selected cylinder PFI (for example, in cylinder just in burning fuel, Yu Yi The gas is operated in the case where not supplying fuel to the cylinder via DI fuel injector during a or multiple cycle of engine Cylinder) with the combustion knock background noise level of the one or more cylinders of maintenance.For example, if V8 is by only living Dynamic DI fuel injector operated under V4S VDE cylinder mode (the 2 of firing order 1,7,6,4 multiply 4 cylinder density) and Selected VDE mode is changed into V6S VDE (the 3 of firing order 1,7,2,6,4,8 multiply 4 cylinder density), then method 700 May determine that can restart cylinder 2 and cylinder 8 in the case where only PFI sprays, so that combustion knock ambient noise Level will not change since PFI injector is closed before opening the knock window of cylinder 1 and cylinder 6.If coming from Starting 3 multiplies 4 cylinder modes in the case that the DI of cylinder 2 and cylinder 8 sprays, then the combustion knock background of cylinder 1 and cylinder 6 Noise level may change into higher level from reduced levels, because cylinder 2 and cylinder 8 are followed in a upper nearest engine It is once deactivated in ring.

On the other hand, if a upper nearest VDE mode is that (the 3 of firing order 1,7,2,6,4,8 multiply 4 cylinders to V6S Density and all cylinders are in only DI jet mode) and selected VDE mode be that (the 2 of firing order 1,7,6,4 multiply 4 gas to V4S Cylinder density), then the PFI injector started in moving cylinder under V4S mode will not change moving cylinder 1, cylinder 7, gas The combustion knock background noise level of cylinder 6 and cylinder 4.Therefore, method 700 will not be in selected VDE under only PFI mode Operant activity cylinder (cylinder 1, cylinder 7, cylinder 6 and cylinder 4) under mode.If method 700 judges can star only PFI spray The combustion knock background noise level to maintain one or more cylinders is penetrated, then answer is yes, and method 700 proceeds to figure The 750 of 11.Otherwise, answer is no, and method 700 proceeds to 710.

Method 700 it may also be desirable to realize desired hair by operating selected cylinder under only PFI mode Motivation torque and engine emission.Method 700 can refer to available engine torque level when operating cylinder under PFI mode It determines whether to provide desired engine torque by operating cylinder under only PFI mode with emission level and start Machine discharge.If desired engine torque and engine emission may not provided by operating some cylinders under only PFI mode, So method 700 may be advanced to 710 without starting cylinder under only PFI mode.

At 710, it is nearest to maintain past upper one that method 700 judges whether to can change cylinder spark density The hair of at least part of phase same level of existing activity (for example, cylinder of burning fuel) cylinder under VDE mode Engine knock background noise level.Method 700 may search for available VDE mode to find and provide in a upper nearest VDE The combustion knock background noise level of at least part of phase same level of existing active engine cylinder can under mode VDE mode, while also verifying the available VDE mode and meeting operator demand's torque and engine noise and vibration limit System.For example, a upper nearest VDE mode be firing order be 1,7,2,6,4,8 fix 3 multiply 4 cylinder density and The selected mode of present engine circulation be firing order the first cycle of engine be 1,2,4, in the second cycle of engine be 3,6,8 and third cycle of engine be carry out after 7 and 5 it is duplicate roll 1 and multiply 3, then method 700 may determine that cylinder It is 1,7,6,4 to fix and 2 multiply 4 cylinder density that igniting density, which can change as firing order, to keep the activity of current VDE mode At least part of engine background knock noise of cylinder is horizontal.Therefore, it is possible to use difference cylinder density is replaced Replace selected VDE mode at least the one of cylinder movable during maintaining the VDE mode being currently up for property VDE mode Combustion knock background noise level in part.If method 700 judge to can change cylinder spark density with maintain with The combustion knock back of combustion knock ambient noise phase same level present at least part of the cylinder of current VDE mode Scape noise, then answer is yes, and method 700 proceeds to 712.Otherwise, answer is no, and method 700 proceeds to 714.

At 712, method 700, which changes into selected VDE mode, has the cylinder spark different from selected VDE mode The new VDE mode of density.Therefore, the VDE mode selected at 208 is not started, and via with different cylinder sparks The VDE mode of density replaces the VDE mode.It can be via with reference to VDE mode stored in memory and will be from depositing Fuel injector operation and the fuel injector under a past upper nearest VDE mode for the VDE mode that reservoir obtains Operation is compared, to determine the VDE mode for replacing selected VDE mode.What the VDE mode maintenance newly started was currently up At least part of combustion knock background noise level of the active engine cylinder of VDE mode.By starting or deactivating quilt The selected fuel injector and poppet of starting or deactivated cylinder starts VDE mode.Method 700, which proceeds to, to be exited.

At 714, method 700 carries on the back the combustion knock of the cylinder restarted under selected VDE mode Scape noise level, which is reset to, previously had stored in the value in controller storage (for example, at 250 of Fig. 2).When opening again When the cylinder being deactivated before dynamic, the combustion knock background noise level of other cylinders is likely to be at low water It is flat, because the fuel injector for the cylinder being deactivated before did not opened and closed.For example, for firing order 1- The eight cylinder engine of 3-7-2-6-5-4-8, if cylinder 2,3 and 5 is in current or next cycle of engine due to VDE mould Formula changes and is deactivated and restarts, then the combustion knock background noise level of cylinder 1,4 and 7 (can be made to come from The injector noise of cylinder 2,3 and 5 is aligned with the knock window of cylinder 1,4 and 7) it is adjusted to the cylinder being newly activated accordingly The previous level of combustion knock ambient noise.Alternatively, if the cylinder being activated before deactivating, can permit Perhaps the combustion knock background by the cylinder of the injector influence of noise from the cylinder being newly deactivated is made an uproar Sound natural horizontal reduces, alternatively, combustion knock background noise level can reduce during present engine recycles The previous time of the VDE mode operation engine of starting is stored in the value in controller storage.Method 700, which proceeds to, to be exited.

At 720, what the retrieval of method 700 started under the VDE mode being currently up including cylinder spark mode starts The list of machine cylinder.The list can be updated when engine enters new VDE mode.For example, if working as Front engine operates engine in the case where cylinder 1,7,2,6,4 and 8 is movable V6S mode during recycling, then method 700 is retrieved List including cylinder 1,7,2,6,4 and 8.Method 700 proceeds to 722.

At 722, method 700, which accesses memory and retrieves, has cylinder point identical with the VDE mode of current selected The list of fiery density but the VDE mode with alternative ignition mode.For example, if having firing order 1-3-7-2-6- The VDE mode of the current selected of the V8 engine of 5-4-8 is the V4S mode with firing order 1-7-6-4, then method 700 There can be the VDE mode of the V4S mode of firing order 3-2-5-8 from memory search.Specific VDE mode can be according to starting Machine configuration and the VDE mode noise and vibration characteristics and become.It is retrieving with different from the VDE mode of current selected After the list of the VDE mode of ignition mode and identical cylinder density, method 700 proceeds to 724.

At 724, method 700, which judges whether to change into the VDE mode of current selected, to be had and current selected The VDE mode of the different ignition mode of VDE mode and identical cylinder density.Method 700 may also require that selected VDE mode Any variation be with utmostly identical or substantially the same (for example, within 5%) as the VDE mode that is currently up The VDE mode of combustion knock background noise level.For example, if it is 1- that the VDE mode being currently up, which is firing order, The V6S of 7-2-6-4-8 and selected VDE mode are the V4S that firing order is 3-2-5-8, then igniting can be used in method 700 Order be the V4S mode of 1-7-6-4 replace the selected VDE mode with maintain may by from operation cylinder 1,7, The engine background noise of the cylinder 5,8,3 and 2 of 6 and 4 fuel injector influence of noise is horizontal (as shown in Figure 5).In addition, By the way that firing order is changed into 1-7-6-4, the engine background noise that can not change cylinder 5,8,3,7,2 and 6 is horizontal, because It is not modified for the fuel injector state of a control of these cylinders.Therefore, method 700 can choose minimum change cylinder Combustion knock background noise level cylinder firing frequency.It should be noted that there are an engine background noises for each cylinder Level, as shown in Fig. 5.If method 700, which is judged to change into selected VDE mode, to be had and selected VDE mould The VDE mode of the different ignition mode of formula and identical cylinder density, and selected VDE mode will be changed into and have phase With other available VDE modes of cylinder spark density compare the identical of the cylinder with maximum sum or substantially The VDE mode of the combustion knock background noise level of identical (for example, within 5%), then answer is yes, and method 800 Proceed to 726.Otherwise, answer is no, and method 700 proceeds to the 704 of Fig. 7.

At 726, method 700 using have cylinder density identical with selected VDE mode but with and selected VDE The VDE mode of the different firing order of mode replaces the selected VDE mode.What method 700 was then selected by order Fuel injector and poppet are closed during at least entire cycle of engine to start the VDE mode.Method 700 proceeds to It exits.

At 730, method 700 retrieves the list of the cylinder started under the VDE mode being currently up.Citing comes It says, if operating engine in the case where cylinder 1,7,2,6,4 and 8 is movable V6S mode during present engine circulation, The retrieval of method 700 includes the list of cylinder 1,7,2,6,4 and 8.Method 700 proceeds to 732.

At 732, the fuel injection that method 700 judges whether to can change the VDE mode of current selected shunt ratio or Shunt fraction under selected VDE mode to maintain the present engine pinking background noise level of the VDE mode being currently up. In one example, method 700 attempts so that in the combustion knock window (window of each cylinder) of selected VDE mode Fuel injector starts the substantial amt of event (for example, opening fuel injector) and fuel injector deactivates event (for example, closing Close fuel injector) substantial amt under the VDE mode being currently up.For example, if current VDE mode is Firing order is 1-7-2-6-5-8 and the V6S of DI injection twice occurs in cylinder knocking window, and the VDE of current selected Mode is that firing order is 1-7-6-4 and the V4S of single DI injection occurs in cylinder knocking window, then method 700 can be with The DI of each active engine cylinder substantial amt sprayed is increased to two, is allowed under the level of V6S firing order Maintain combustion knock background noise level as many.Similarly, if the VDE mode being currently up includes each activity hair DI of motivation cylinder sprays, and the VDE mode of current selected includes the injection of DI twice of each active engine cylinder, The DI injection of selected VDE mode can so be changed into the primary of each active engine cylinder of selected VDE mode DI injection.In addition, if method 700 judges that the fuel for being ejected into cylinder via port fuel injector gas can be moved into The DI injection (for example, adjustment shunt fraction) of cylinder is to maintain engine in cylinder as much as possible under selected VDE mode Pinking background noise level, or vice versa, then method 700 adjusts the shunt fraction to maintain current power as much as possible Machine pinking background noise level.If method 900 is judged to can change the fuel injection split ratio of the VDE mode of current selected Rate or shunt fraction under selected VDE mode to maintain the present engine pinking ambient noise of the VDE mode being currently up Level, then answer is yes, and method 700 proceeds to 734.Otherwise, answer is no, and method 700 proceeds to the 706 of Fig. 7.

At 734, method 700 adjusts fuel injection and shunts ratio and/or shunt fraction, under selected VDE mode The combustion knock as the present engine pinking background noise level under the VDE mode of current active is maintained as much as possible Background noise level.Therefore, method 700 can by adjusting selected VDE mode fuel injection timing to maintain engine Pinking background noise level shunts ratio and/or fuel injection shunt fraction to adjust fuel injection.Method 700, which proceeds to, moves back Out.

At 740, method 700 retrieves the list of the cylinder started under the VDE mode being currently up.Citing comes It says, if operating engine in the case where cylinder 1,7,2,6,4 and 8 is movable V6S mode during present engine circulation, The retrieval of method 700 includes the list of cylinder 1,7,2,6,4 and 8.Method 700 proceeds to 732.

At 742, method 700 judges whether can change the SOI of the fuel injection of the VDE mode of current selected to select The present engine pinking background noise level for the VDE mode being currently up is maintained under fixed VDE mode.In one example, Method 700 determines whether the SOI timing of selected VDE mode is later than the SOI timing for the VDE mode being currently up.If so, that Method 700 the SOI timing of selected VDE mode can be shifted to an earlier date under selected VDE mode in cylinder as much as possible Middle maintenance present engine pinking background noise level.In addition, if under the VDE mode that SOI timing can will be selected in advance The immigration of fuel injector control action includes the cylinder of the identical fuel injector control action under the VDE mode being currently up Fuel injection window, then method 700 can shift to an earlier date the SOI timing of the moving cylinder under selected VDE mode.Equally Ground, if can not include in advance being currently up by the fuel injector control action removal under selected VDE mode by SOI timing VDE mode under identical fuel injector control action cylinder fuel injection window, then method 700 can will be selected The SOI timing of moving cylinder under fixed VDE mode shifts to an earlier date.If method 700 is judged to can change the VDE mould of current selected The SOI of the fuel injection of formula under selected VDE mode to maintain the present engine pinking background of the VDE mode being currently up Noise level, then answer is yes, and method 700 proceeds to 744.Otherwise, answer is no, and method 700 proceeds to Fig. 7's 706。

At 744, method 700 adjusts SOI timing, to maintain as much as possible under selected VDE mode and current active VDE mode under the same combustion knock background noise level of present engine pinking background noise level.Therefore, method The SOI timing of 700 adjustable selected VDE modes is to maintain combustion knock background noise level.Method 700, which proceeds to, moves back Out.

At 750, method 700 deactivates the DI injector of selected cylinder and only starts the PFI injection of selected cylinder Device, to maintain starting for current VDE mode in the cylinder as much as possible of selected VDE mode under selected VDE mode Machine cylinder knocking background noise level.Method 700, which proceeds to, to be exited.

Referring now to Figure 12, shows explanation and diagnose VDE mode entrance via combustion knock background noise level Exemplary sequence.The sequence of Figure 12 can be provided via the system of the Figure 1A to Fig. 1 C to cooperate with the method for Fig. 2 and Fig. 6.In In this example, the engine is four stroke V8 engines.

First curve graph at the top from Figure 12 is curve graph of the VDE mode relative to the time.Vertical axis indicates VDE Mode, and VDE mode is identified by the label of 1202 top of trace.Trace 1202 indicates VDE mode.When horizontal axis indicates Between, and right side of the time from the left side of curve graph to curve graph increases.

Second curve graph at the top from Figure 12 be cylinder numbers one combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers one, and the hair of cylinder numbers one Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers one of trace 1204 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

The third curve graph at the top from Figure 12 be cylinder numbers two combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers two, and the hair of cylinder numbers two Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers two of trace 1206 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

4th curve graph at the top from Figure 12 be cylinder numbers three combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers three, and the hair of cylinder numbers three Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers three of trace 1208 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

5th curve graph at the top from Figure 12 be cylinder numbers four combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers four, and the hair of cylinder numbers four Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers four of trace 1210 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

6th curve graph at the top from Figure 12 be cylinder numbers five combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers five, and the hair of cylinder numbers five Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers five of trace 1212 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

7th curve graph at the top from Figure 12 be cylinder numbers six combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers six, and the hair of cylinder numbers six Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers six of trace 1214 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

8th curve graph at the top from Figure 12 be cylinder numbers seven combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers seven, and the hair of cylinder numbers seven Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers seven of trace 1216 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

The zigzag line chart at the top from Figure 12 be cylinder numbers eight combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers eight, and the hair of cylinder numbers eight Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers eight of trace 1218 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

Tenth curve graph at the top from Figure 12 is curve graph of the VDE deterioration instruction relative to the time.Vertical axis table Show that VDE is deteriorated, and indicates VDE deterioration when trace 1212 is near vertical axis arrow.When trace 1212 is in horizontal axis Do not indicate that VDE is deteriorated when nearby.Trace 1202 indicates VDE deterioration state.Horizontal axis indicates the time, and the time is from curve graph Left side to the right side of curve graph increase.

At time t0, engine operates under V8 mode and does not indicate that VDE is deteriorated.The combustion knock of cylinder 1-8 is carried on the back Scape noise level is in by-level.At time t1, order engine enters V6 mode, wherein in the eight of engine cylinder Only six cylinder combustion fuel.Order closes the intake and exhaust valves of two cylinders being deactivated and in one or more It is remained turned-off during cycle of engine.In addition, the fuel injector for two cylinders for being ordered to be closed or deactivating is ordered to be closed. In this example, cylinder numbers 3 and 5 are ordered to be closed.Because the fuel injector of cylinder numbers 3 is ordered to be closed, gas The combustion knock background noise level of cylinder number 4 is reduced.Even if however, because cylinder numbers 7 fuel injector by Order, which is closed, also to be continued to operate, so the combustion knock background noise level of cylinder numbers 7 does not reduce.

At time t2, does not reduce in response to the combustion knock noise level of cylinder numbers 7 and indicate VDE and deteriorate.It Afterwards soon, at time t3, in response to VDE deterioration instruction and so that engine transitions is returned to V8 mode.By restarting quilt Deactivated cylinder, it is possible to reduce a possibility that further engine degradation and/or engine emission deteriorate.Referring to After showing VDE deterioration, engine continuation operates under V8 mode.

In this way, it is possible to use combustion knock background noise level as the presence or not of instruction VDE mode deterioration Existing basis.In addition, in some instances, if the engine background noise level of one or more cylinders is not rung One or more cylinders should be started in order and increased, then can indicate that VDE mode deteriorates.

Referring now to Figure 13, shows first for maintaining the combustion knock background noise level of cylinder and show Example property sequence.The sequence of Figure 13 can be provided via the system of the Figure 1A to Fig. 1 C to cooperate with the method for Fig. 2 and Fig. 7.

First curve graph at the top from Figure 13 is curve graph of the VDE mode relative to the time.Vertical axis indicates VDE Mode, and VDE mode is identified by the label along vertical axis.VDE mode 1-3 is shown for illustration purposes only, and Additional or less available VDE mode can be provided.VDE mode may include (but being not limited to) V6S, V6R, I4S and I4R.Trace 1302 indicates VDE mode.Horizontal axis indicates time, and right side of the time from the left side of curve graph to curve graph Increase.

Second curve graph at the top from Figure 13 is curve graph of the cylinder spark mode relative to the time.Vertical axis table Show cylinder spark mode, and three cylinder spark modes of a VDE mode are shown in this example.Trace 1304 indicates gas Cylinder ignition mode.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

The third curve graph at the top from Figure 13 is curve graph of the selected VDE mode relative to the time.Vertical axis It indicates selected VDE mode, and there are three kinds of possible selected VDE modes in this example.Trace 1306 indicates selected VDE mode.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

At time t10, selected VDE mode is mode 1 and cylinder spark mode is MODE NUMBER 2.It is currently up VDE mode is mode 1.At time t11, selected VDE mode is changed into mode 2 in response to vehicle working condition.Cylinder point Fiery mode keeps the second ignition mode, and still starts VDE mode 1.The various cylinder sparks of the selected VDE mode of controller search Mode, and determination can maintain to start under current VDE mode by adjusting the cylinder spark mode of selected VDE mode The maximum total combustion knock background noise level (for example, be maintained under their present level or near) of machine cylinder.In New cylinder spark mode is selected for selected VDE mode at time t12.The selected VDE mode of starting, and in the time Cylinder is operated according to new cylinder spark mode at t13.

In this way, it is possible to adjust cylinder spark mode to maintain the combustion knock of one or more cylinders to carry on the back Scape noise level.The cylinder spark mode by VDE mode to be started be can change to maintain the engine of cylinder quick-fried Shake background noise level.By maintaining combustion knock background noise level, it is possible to avoid the pinking of false positive indicates.This Outside, it is possible to avoid the combustion knock event of omission allows to avoid engine degradation.

Referring now to Figure 14, shows second for maintaining the combustion knock background noise level of cylinder and show Example property sequence.The sequence of Figure 14 can be provided via the system of the Figure 1A to Fig. 1 C to cooperate with the method for Fig. 2 and Fig. 7.

First curve graph at the top from Figure 14 is curve graph of the VDE mode relative to the time.Vertical axis indicates VDE Mode, and VDE mode is identified by the label along vertical axis.VDE mode 1-3 is shown for illustration purposes only, and Additional or less available VDE mode can be provided.VDE mode may include (but being not limited to) V6S, V6R, I4S and I4R.Trace 1402 indicates VDE mode.Horizontal axis indicates time, and right side of the time from the left side of curve graph to curve graph Increase.

Second curve graph at the top from Figure 14 is curve graph of the cylinder shunt jet mode mode relative to the time. Vertical axis indicates cylinder shunt jet mode, and shows three kinds of cylinder shunt jet modes in this example.Trace 1404 indicate cylinder shunt jet mode.Horizontal axis indicates the time, and the time is from the left side of curve graph to curve graph Right side increases.

The third curve graph at the top from Figure 14 is curve graph of the selected VDE mode relative to the time.Vertical axis It indicates selected VDE mode, and there are three kinds of possible selected VDE modes in this example.Trace 1406 indicates selected VDE mode.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

At time t20, selected VDE mode is mode 2, and cylinder shunt jet mode is 2.It is currently up VDE mode is mode 2.At time t21, selected VDE mode is changed into mode 3 in response to vehicle working condition.Cylinder point Streaming jet mode keeps 2, and still starts VDE mode 2.The various cylinder cylinders of the selected VDE mode of controller search shunt Formula fuel injection mode, and determination can maintain to work as by adjusting the cylinder shunt jet mode of selected VDE mode Maximum total combustion knock background noise level of cylinder under preceding VDE mode is (for example, be maintained at the current of them Level it is lower or near).New cylinder shunt jet mode is selected for selected VDE mode at time t22.Starting choosing Fixed VDE mode, and cylinder is operated according to new cylinder shunt fuel injection mode at time t23.

In this way, it is possible to adjust cylinder shunt jet mode to maintain the engine of one or more cylinders Pinking background noise level.The cylinder shunt jet mode by VDE mode to be started be can change to maintain engine air The combustion knock background noise level of cylinder.By maintaining combustion knock background noise level, it is possible to avoid false positive Pinking instruction.Further, it is possible that avoiding the combustion knock event omitted, allow to avoid engine degradation.

Referring now to Figure 15, shows the third for maintaining the combustion knock background noise level of cylinder and show Example property sequence.The sequence of Figure 15 can be provided via the system of the Figure 1A to Fig. 1 C to cooperate with the method for Fig. 2 and Fig. 7.

First curve graph at the top from Figure 15 is curve graph of the VDE mode relative to the time.Vertical axis indicates VDE Mode, and VDE mode is identified by the label along vertical axis.VDE mode 1-3 is shown for illustration purposes only, and Additional or less available VDE mode can be provided.VDE mode may include (but being not limited to) V6S, V6R, I4S and I4R.Trace 1502 indicates VDE mode.Horizontal axis indicates time, and right side of the time from the left side of curve graph to curve graph Increase.

Second curve graph at the top from Figure 15 is curve graph of the cylinder injection time started relative to the time.Vertical axis Line indicates the cylinder injection time started, and the cylinder injection time started becomes further on the direction of vertical axis arrow Delay.Trace 1504 indicates the cylinder injection time started.Horizontal axis indicates the time, and the time is from the left side of curve graph to song The right side of line chart increases.

The third curve graph at the top from Figure 15 is curve graph of the selected VDE mode relative to the time.Vertical axis It indicates selected VDE mode, and there are three kinds of possible selected VDE modes in this example.Trace 1506 indicates selected VDE mode.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

At time t30, selected VDE mode is mode 2, and the cylinder injection time started is later (for example, being delayed by). The VDE mode being currently up is mode 2.At time t31, selected VDE mode is changed into mould in response to vehicle working condition Formula 3.The cylinder injection time started is still delayed by, and still starts VDE mode 2.The injection of the selected VDE mode of controller search is opened Begin the time, and determination can be maintained under current VDE mode in advance by the way that the injection for the VDE mode selected is started timing Maximum total combustion knock background noise level of cylinder is (for example, be maintained under their present level or attached Closely).The new cylinder injection time started is selected for selected VDE mode at time t32.The selected VDE mode of starting, And cylinder is operated according to the new injection time started at time t33.

In this way, it is possible to which the cylinder injection time started to be shifted to an earlier date to the engine to maintain one or more cylinders Pinking background noise level.The cylinder fuel injection time started by VDE mode to be started be can change to maintain engine The combustion knock background noise level of cylinder.By maintaining combustion knock background noise level, it is possible to avoid mistake is agreed Fixed pinking instruction.Further, it is possible that avoiding the combustion knock event omitted, allow to avoid engine degradation.

Referring now to Figure 16, shows for maintaining the combustion knock background noise level of cylinder the 4th and show Example property sequence.The sequence of Figure 16 can be provided via the system of the Figure 1A to Fig. 1 C to cooperate with the method for Fig. 2 and Fig. 7.

First curve graph at the top from Figure 16 is curve graph of the VDE mode relative to the time.Vertical axis indicates VDE Mode, and VDE mode is identified by the label along vertical axis.VDE mode 1-3 is shown for illustration purposes only, and Additional or less available VDE mode can be provided.VDE mode may include (but being not limited to) V6S, V6R, I4S and I4R.Trace 1602 indicates VDE mode.Horizontal axis indicates time, and right side of the time from the left side of curve graph to curve graph Increase.

Second curve graph at the top from Figure 16 is curve graph of the cylinder spark density relative to the time.Vertical axis table Show cylinder spark density, and cylinder spark density increases on the direction of vertical axis arrow.Trace 1604 indicates cylinder injection Time started.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

The third curve graph at the top from Figure 16 is curve graph of the selected VDE mode relative to the time.Vertical axis It indicates selected VDE mode, and there are three kinds of possible selected VDE modes in this example.Trace 1606 indicates selected VDE mode.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

At time t40, selected VDE mode is mode 1, and cylinder spark density is in higher level.It is currently up VDE mode be mode 1.At time t41, selected VDE mode is changed into mode 2 in response to vehicle working condition.Cylinder Density of lighting a fire keeps being in higher level, and still starts VDE mode 1.The cylinder density of the selected VDE mode of controller search, And determination can be by reducing cylinder spark density from present level and cylinder spark density being made to increase to selected VDE mould Maximum total combustion knock background of the cylinder under current VDE mode more than the cylinder spark density of formula is maintained to make an uproar Sound is horizontal (for example, be maintained under their present level or near).It is selected at time t42 for selected VDE mode New cylinder spark density.The selected VDE mode of starting, and operated at time t33 according to new cylinder spark density Cylinder.

In this way, it is possible to change cylinder spark density relative to the cylinder spark density of selected VDE mode to tie up Hold the combustion knock background noise level of one or more cylinders.It can change the gas of VDE mode to be started Cylinder lights a fire density to maintain the combustion knock background noise level of cylinder.By maintaining combustion knock ambient noise It is horizontal, it is possible to avoid the pinking of false positive indicates.Further, it is possible that the combustion knock event omitted is avoided, so that can To avoid engine degradation.

Referring now to Figure 17, the second positive time series for showing exemplary engine pinking ambient noise window timing is shown 1700.Illustrated timing is for the eight cylinder engine with firing order 1-3-7-2-6-5-4-8.The engine is The four-stroke engine of circulation with 720 crankshaft degree.Engine crankshaft degree is positioned along horizontal axis, and zero degree indicates cylinder The top dead centre compression stroke of number one.Along eight cylinders of vertical axis label.

The combustion knock window of cylinder numbers one is indicated by slanted bar 1702.By with the label pair along vertical axis Quasi- similar slanted bar (1704-1716) indicates the knock window of remaining cylinder (2 to 8).Solid bars 1730 indicate gas The DI fuel injector of cylinder number two opens section.When solid bars 1730 are invisible, the DI fuel injector of cylinder numbers two It is to close.The DI fuel injector of cylinder numbers two is opened in the left side of solid bars 1730, and on the right side of solid bars 1730 It closes.The DI fuel injection of remaining cylinder (2 to 8), and they are indicated by similar solid bars (1732-1744) Follow agreement identical with solid bars 1730.Fuel injector 1730-1744 respectively with the fuel listed along vertical axis The alignment of cylinder corresponding to shedder bar.

The stroke of cylinder numbers one is indicated by horizontal line 1750.Alphabetical p, e, i and c identification is associated with cylinder numbers one Acting (p) stroke, exhaust (e) stroke, air inlet (i) stroke and compression (c) stroke.Identify that other start by similar mode The stroke of machine cylinder.

Figure 17 further includes the DI fuel injection for describing a cylinder and the combustion knock background noise level of another cylinder Between relationship table 1701, as according to illustrated by sequence 1700.Table 1701 includes that instruction is carried out to which cylinder injection fuel First label of burning.Cylinder number is arranged according to the firing order 1-3-7-2-6-5-4-8 of engine.Second label It indicates by the knock window for carrying out the cylinder that fuel injection is influenced to the cylinder of burning.Table 1701 shows the knock window of cylinder 4 Mouth is influenced (cylinder 3 is located above cylinder 4 in the table) by the injection of the fuel to burn in cylinder 3.Table 1701 also shows The knock window for having gone out cylinder 8 is influenced by the injection of the fuel to burn in cylinder 7.Finally, the knock window of cylinder 1 by The injection of the fuel to burn in cylinder 2 influences.Therefore, in this example, not all cylinder knocking window will be all by will fire Material, which is ejected into other cylinders, to be influenced.Only the knock window of three cylinders has and is influenced by injector control action Noise level.

Thus, it can be observed that: with each cylinder combustion knock background noise level be it is desirable, make The cylinder influenced by poppet closing or fuel injector opening and closing can be compensated when VDE mode changes and starts by obtaining. Combustion knock background noise level can be stored in controller storage, and be retrieved when VDE mode changes and starts It is more reliable to allow to combustion knock assessment for the combustion knock background noise level.

Referring now to Figure 18, the engine with the method for Fig. 3 according to fig. 2 with the cooperative system of Figure 1A to Fig. 1 C is shown The sequence of operation.

First curve graph at the top from Figure 18 is curve graph of the engine operation mode relative to the time.Vertical axis Indicate engine operation mode, and label by positioning along vertical axis identifies engine operation mode.V8 instruction hair Motivation is operated in all movable situation of all cylinders.V4 instruction engine carries out in only four movable situations of cylinder Operation.BG noise characterization indicates solution combustion knock background noise level and deposits the combustion knock background noise level Controller storage is stored up for then using during knock detection.Trace 1802 indicates engine operation mode.Trunnion axis Line indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

Second curve graph at the top from Figure 18 be cylinder numbers one combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers one, and the hair of cylinder numbers one Engine knock background noise level increases on the direction of vertical axis arrow.Real trace 1804 indicates the cylinder according to this description The combustion knock background noise level of number one.Empty trace 1805, which is shown in, is being not used the previously determined of cylinder numbers one Combustion knock background noise level substitutes the feelings of the currently determining combustion knock background noise level of cylinder numbers one Under condition continuously determine cylinder numbers one combustion knock background noise level in the case where cylinder numbers one engine Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

The third curve graph at the top from Figure 18 be cylinder numbers two combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers two, and the hair of cylinder numbers two Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers two of trace 1806 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

4th curve graph at the top from Figure 18 be cylinder numbers three combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers three, and the hair of cylinder numbers three Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers three of trace 1808 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

5th curve graph at the top from Figure 18 be cylinder numbers four combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers four, and the hair of cylinder numbers four Engine knock background noise level increases on the direction of vertical axis arrow.Real trace 1810 indicates the cylinder according to this description The combustion knock background noise level of number four.Empty trace 1811, which is shown in, is being not used the previously determined of cylinder numbers four Combustion knock background noise level substitutes the feelings of the currently determining combustion knock background noise level of cylinder numbers four Under condition continuously determine cylinder numbers four combustion knock background noise level in the case where cylinder numbers four engine Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

6th curve graph at the top from Figure 18 be cylinder numbers five combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers five, and the hair of cylinder numbers five Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers five of trace 1812 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

7th curve graph at the top from Figure 18 be cylinder numbers six combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers six, and the hair of cylinder numbers six Engine knock background noise level increases on the direction of vertical axis arrow.Trace 1814 indicates to be compiled according to the cylinder of this description Numbers six combustion knock background noise level.Empty trace 1815 is shown in the previously determined hair that cylinder numbers six are not used The case where currently determining combustion knock background noise level of the engine knock background noise level to substitute cylinder numbers six Under continuously determine cylinder numbers six combustion knock background noise level in the case where cylinder numbers six engine it is quick-fried Shake background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

8th curve graph at the top from Figure 18 be cylinder numbers seven combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers seven, and the hair of cylinder numbers seven Engine knock background noise level increases on the direction of vertical axis arrow.Trace 1816 indicates to be compiled according to the cylinder of this description Numbers seven combustion knock background noise level.Empty trace 1817 is shown in the previously determined hair that cylinder numbers seven are not used The case where currently determining combustion knock background noise level of the engine knock background noise level to substitute cylinder numbers seven Under continuously determine cylinder numbers seven combustion knock background noise level in the case where cylinder numbers seven engine it is quick-fried Shake background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

The zigzag line chart at the top from Figure 18 be cylinder numbers eight combustion knock background noise level relative to The curve graph of time.Vertical axis indicates the combustion knock background noise level of cylinder numbers eight, and the hair of cylinder numbers eight Engine knock background noise level increases on the direction of vertical axis arrow.The engine of the expression cylinder numbers eight of trace 1818 Pinking background noise level.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

Tenth curve graph at the top from Figure 18 is to indicate whether the DI injector of cylinder 1-8 is movable relative to the time Curve graph.Vertical axis indicates the mode of operation of the DI injector of cylinder 1-8.Such as 1820 secret note there are instructions and secret note It is associated and is activated during the circulation of associated cylinder along the DI injector that vertical axis indicates.For example, item 1820 instruction start from time t50 and until the DI injector of the cylinder cycle inside cylinder 1 of time t51 be it is movable (for example, It opens and closes to spray fuel).The DI injector of cylinder 1 is stopped in the cylinder cycle between time t51 and time t52 With.The DI injector of cylinder 1 is movable in the cylinder cycle after time t52.Cylinder 2-8 is indicated in the same way Item.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

11st curve graph at the top from Figure 18 be indicate cylinder 1-8 passage injector whether activity relative to The curve graph of time.Vertical axis indicates the mode of operation of the passage injector of cylinder 1-8.Such as 1822 secret note presence It indicates associated with secret note and is opened during the circulation of associated cylinder along the passage injector that vertical axis indicates It is dynamic.For example, item 1822 instruction start from time t50 to the sequence ends cylinder cycle inside cylinder 1 intake port injection Device is movable (for example, opening and closing to spray fuel).The item of cylinder 2-8 is indicated in the same way.Horizontal axis Indicate the time, and right side of the time from the left side of curve graph to curve graph increases.

12nd curve graph at the top from Figure 18 is curve graph of the pinking instruction state relative to the time.Vertical axis Indicate pinking instruction state.Pinking is indicated when the high level that trace 1824 is near vertical axis arrow.When trace 1824 Pinking is not indicated when low-level near horizontal axis.Trace 1824 indicates the state of pinking instruction.Horizontal axis indicates Time, and right side of the time from the left side of curve graph to curve graph increases.

13rd curve graph at the top from Figure 18 is curve graph of the engine spark timing relative to the time.Vertical axis Line indicates engine spark timing, and engine spark timing is advanced up in the side of vertical axis arrow.Therefore, horizontal axis Level at engine spark timing it is more than the engine spark timing retard near vertical axis arrow.1826 table of trace Show engine spark timing.Horizontal axis indicates the time, and right side of the time from the left side of curve graph to curve graph increases.

At time t50, engine operates under V8 mode and does not indicate pinking.The combustion knock background of cylinder 1-8 Noise level is in by-level.The DI injector and passage injector of all cylinders are all movable.At spark timing In by-level.

At time t51, start the characterization or understanding to combustion knock ambient noise, it is such as higher by changing into state Indicated by horizontal trace 1802.By determining starting for all cylinders when all fuel injectors are all activated Machine pinking background noise level simultaneously stores the combustion knock background noise level to controller storage (for example, RAM) To start to understand.The combustion knock background noise level of cylinder 5 at this time is indicated by arrow 1850.Cylinder 1 at this time Combustion knock background noise level is indicated by arrow 1854.The combustion knock back of each cylinder is determined at this moment Scape noise level simultaneously stores the combustion knock background noise level to controller storage.If engine operating condition from when Between start before t51 to change less, then combustion knock background noise level can be determined within a short period of time, as shown herein It is shown in example.These are that the combustion knock background of all cylinder operations in all movable situation of all fuel injectors is made an uproar Sound is horizontal.Once it is determined that the combustion knock background noise level of each cylinder and by the combustion knock background Noise level is stored to controller storage, just passes through the DI fuel injector item of cylinder numbers one soon after time t51 Be not present to show the DI injector of cylinder 1 and be deactivated.DI of the combustion knock background noise level of cylinder 5 in cylinder 1 Injector is decayed after being deactivated.It is later determined that the combustion knock background of the cylinder 5 when the DI injector of cylinder 1 is deactivated Noise level, and after the combustion knock background noise level of cylinder 5 is stable (as shown in arrow 1852) by institute The storage of combustion knock background noise level is stated to controller storage.

At time t52, completion makes an uproar to the combustion knock background of the cylinder 5 when the DI injector of cylinder 1 is deactivated The storage of sound level, therefore restart the DI injector of cylinder 1 and the DI injector of deactivated cylinder 2.The engine of cylinder 1 is quick-fried Shake background noise level decays after the DI injector of cylinder 2 is deactivated.It is later determined that the DI injector in cylinder 2 is deactivated When cylinder 1 combustion knock background noise level, and it is stable in the combustion knock background noise level of cylinder 1 The combustion knock background noise level is stored to controller storage (as shown in arrow 1856) later.

At time t53, completion makes an uproar to the combustion knock background of the cylinder 1 when the DI injector of cylinder 2 is deactivated The storage of sound level, therefore restart the DI injector of cylinder 2 and the DI injector of deactivated cylinder 3.The process continues, directly To the engine background noise level for having determined that all cylinders and the engine background noise level is stored to control Until device memory.It should be noted that the DI injector of cylinder is shown as sequentially being stopped according to the order of cylinder numbers With and starting, but the order which cylinder to influence the background noise level of the cylinder with the fuel injector being deactivated according to comes Determine that the engine background noise of cylinder is horizontal and stores engine background noise level storage to controller Device.Therefore, according to the table 501 in Fig. 5, when deactivating DI injector according to 1-8 order as shown, according to 5-1-4-2-7-3-8- 6 order determines and stores combustion knock background noise level.Between time t51 and time t54, engine is all Burning fuel in cylinder, and each cylinder combustion substantially stoichiometric air-fuel ratio (for example,+5%).In cylinder Increase the amount that the fuel of cylinder is ejected by port fuel injector when DI injector is deactivated, so that the cylinder is sprayed in DI The fuel for substantially equal amount of burning before emitter is deactivated and after DI injector is deactivated.This allows engine right Vehicle occupant causes to continue to operate in the case where least interference.

At time t54, all DI injectors of all cylinders have been deactivated, and will be fired by DI The combustion knock background noise level storage of the cylinder of the deactivated influence of material ejector makes to controller storage for subsequent With.Engine returns to V8 mode, and all fuel injectors are all activated, and the engine background of all cylinders Noise level is in stationary value.

At time t55, engine enters V4 mode, and wherein cylinder 2,3,5 and 8 is deactivated, and not via DI injector Fuel is sprayed with passage injector.Because deactivated cylinder 2,3,5 and 8 will affect the combustion knock background of cylinder 1,4,6 and 7 Noise level, thus applied at time t55 for operate the cylinder 2,3,5 and 8 without DI injector when Between the combustion knock background noise level that is determined between t51 and time t55, the combustion knock background noise level influences Ambient noise in the knock window of cylinder 1,4,6 and 7.For example, application is indicated by arrow 1856 at time t55 Combustion knock background noise level, as indicated by arrow 1858.Therefore, determine that combustion knock is to be based at time t55 (dotted line 1805 is at time t55 for combustion knock background noise level 1858 rather than engine background noise level 1859 Starting point).Finally, by currently determining by the detonation sensor output (being indicated by dotted line 1805) integrated and corrected by filtering Combustion knock background noise level converge on combustion knock background noise level 1859, but simultaneously, by combustion knock Background noise level 1858 determines the existence or non-existence of combustion knock.Therefore, combustion knock can be determined more reliably that Existence or non-existence.Similarly, the combustion knock background noise level that application is indicated by arrow 1860 at time t55, As indicated by arrow 1862, the combustion knock background noise level that application is indicated by arrow 1864 at time t55, such as arrow Indicated by 1866, the combustion knock background noise level that application is indicated by arrow 1868 at time t55, such as 1870 institute of arrow Instruction.

Between time t55 and time t56, indicate to start based on the combustion knock background noise level previously understood Machine pinking.Pinking instruction causes to postpone spark timing in the cylinder of instruction pinking.

At time t56, engine returns to V8 mode, wherein starting institute in the case where all injectors are all activated There is cylinder.Because starting cylinder 2,3,5 and 8 will affect the combustion knock background noise level of cylinder 1,4,6 and 7, The combustion knock ambient noise water determined between the time t51 for operating all cylinders is applied at time t55 It is flat.For example, the combustion knock background noise level that application is indicated by arrow 1854 at time t56, such as arrow 1880 It is indicated.Therefore, determine that combustion knock is based on combustion knock background noise level 1880 rather than is sent out at time t56 Motivation background noise level 1881 (starting point of the dotted line 1805 at time t56).Finally, by currently by filtering by integrating The combustion knock background noise level that detonation sensor output (being indicated by dotted line 1805) with correction determines, which converges on, starts Machine pinking background noise level 1881, but simultaneously, depositing for combustion knock is determined by combustion knock background noise level 1880 Or be not present.Therefore, the existence or non-existence of combustion knock can be determined more reliably that.Similarly, for cylinder 4,7 and 8 execute the replacement of combustion knock background noise level.

In this way, it is possible to deactivate and start to determine via invasive DI fuel injector and/or PI fuel injector Engine background noise is horizontal, allows to the subsequent time in starting and deactivated VDE mode using the engine background Noise level.The invasive DI fuel injector and PI fuel injection can be executed in the case where not interfering vehicle occupant Device deactivates, because engine continue to be operated in the case where equal number of moving cylinder and identical air-fuel ratio.

Therefore, method described herein provides a kind of method of engine operation, and the method for engine operation includes: entrance First operator scheme, wherein deactivating the first cylinder via controller；And via the controller according to relative to several conditions And the first background noise level of the second cylinder established indicates to generate the pinking of second cylinder, the condition is included in The direct injector of first cylinder is deactivated during first cycle of engine, first cylinder is followed in first engine Burning fuel during ring.The spark timing of second cylinder is postponed the method also includes being indicated in response to pinking.Institute The method of stating further includes integrating and correcting the output of detonation sensor, and the output of the detonation sensor is in second gas It is sampled during the knock window of cylinder, and wherein the knock window of second cylinder is the acting of second cylinder Crankshaft degree section during stroke.The method also includes the outputs by integrating and correcting to the detonation sensor Low-pass filtering is carried out to provide first background noise level.The method also includes making the warp of the detonation sensor The output for crossing integration and correction passes through the output integrated and corrected by low-pass filtering divided by the described of the detonation sensor To determine knock intensity level, and wherein pinking instruction is horizontal based on the knock intensity.The method also includes exiting The first operator scheme simultaneously enters second operator scheme, and in the second operation mode, all cylinders are all movable And via the controller according to relative to several conditions and the second background noise level of second cylinder of establishment mentions For the pinking instruction of second cylinder, the condition includes starting the institute of first cylinder during the second cycle of engine State direct injector, first cylinder burning fuel, second cycle of engine during second cycle of engine Occur before entering the first operator scheme.It is wherein in the hair the method includes the wherein first operator scheme The mode of at least one cylinder is deactivated during each circulation of motivation.

Method described herein also provides a kind of method of engine operation, and the method for engine operation includes: variable The variable row is operated in the case where all cylinder all burning fuels via controller during the first circulation of displacement engine Measure engine；And first group of cylinder ambient noise is generated from the output of the detonation sensor during the first circulation It is horizontal；It burns in all cylinders during the second circulation of the modulated displacement engine via the controller combustion Expect, and deactivates the direct fuel of the first cylinder when the burning fuel in all cylinders during the second circulation Injector, and the ambient noise water of output the second cylinder of generation from the detonation sensor during the second circulation It is flat；It generates via the controller by described in first group of cylinder background noise level and second cylinder One or more pinkings instruction of background noise level and determination；And via the controller in response to one or more of Pinking indicates to adjust spark timing.The method includes all direct injectors of the wherein engine all to start described It is operated during the first circulation of machine.

In some instances, the method also includes sequentially deactivating the injection of the direct fuel of the modulated displacement engine Each of device is to generate second group of cylinder background noise level, the background noise level of second cylinder It is included in second group of cylinder background noise level.The method also includes immediately in from all cylinders all by Modulated displacement engine is operated in the case where starting to change into after the mode that at least one cylinder is deactivated using from described At least one cylinder background noise level of second group of cylinder background noise level determines pinking.The side Method further include immediately under the mode that at least one cylinder is deactivated operate modulated displacement engine change into all cylinders At least one engine air from first group of cylinder background noise level is applied after the mode being all activated Cylinder background noise level determines pinking.The method includes wherein port fuel injectors during the second circulation to First cylinder supplies fuel.The method includes the background noise levels of wherein second cylinder to depend on direct fuel Whether injector is activated.It is from multiple pinkings the method includes wherein first group of cylinder background noise level The output of sensor and generate.

It should be noted that the exemplary control and estimation routine that include herein can be used for various engines and/or Vehicular system Configuration.Control method and routine disclosed herein can be used as executable instruction and be stored in non-transitory memory, and can To be executed by the combined control system for including controller and various sensors, actuator and other engine hardwares.It retouches herein The particular routine stated can indicate that one or more of any number of processing strategie, the processing strategie are, for example, that event is driven Dynamic, interruption driving, multitask, multithreading etc..Therefore, can according to illustrated sequence, concurrently or in some cases Omit illustrated various movements, operation and/or function.Similarly, it is not necessarily required to that the processing order is retouched herein to realize The feature and advantage for the illustrative examples stated, but provided for the simplification illustrated and described.It can be according to used Specific policy is repeatedly carried out one or more of illustrated movement, operation and/or function.In addition, described dynamic Work, operation and/or function can clearly indicate the computer readable storage medium that will be programmed into engine control system Non-transitory memory in code, wherein by including the combination of various engine hardware components and electronic controller It is executed instruction in system to implement described movement.

It will be appreciated that, configuration disclosed herein and routine are exemplary in itself, and should not see in a limiting sense To these particular examples, because numerous variations are possible.For example, the above technology can be applied to V-6, I-4, I-6, V- 12, opposed 4 cylinder and other engine types.The theme of the disclosure includes that various systems disclosed herein and configuration are special with other All novel and non-apparent combinations and sub-portfolio of sign, function and/or property.

Appended claims, which particularly point out, is considered as novel and non-apparent specific combination and sub-portfolio.These claims It may refer to " one " element or " first " element or its equivalent.Such claim should be interpreted as including being incorporated to one or more This class component, both two or more neither requiring nor excluding this class components.By correcting the claims or passing through New claims are presented disclosed feature, function, element and/or property is claimed in application or related application herein Other combinations of matter and sub-portfolio.Such claims, compared with original claims in range more extensively, more It is narrow, equal or different, it is also regarded as including in the theme of the disclosure.

According to the present invention, a kind of method of engine operation includes: into first operator scheme, wherein deactivating via controller First cylinder；And via the controller according to the first ambient noise water of the second cylinder of establishment relative to several conditions It puts down to generate the pinking of second cylinder instruction, the condition includes that first gas is deactivated during the first cycle of engine The direct injector of cylinder, first cylinder burning fuel during first cycle of engine.

It is of the invention to be further characterized in that according to embodiment, in response to pinking instruction by the spark of second cylinder Timing retard.

It is of the invention to be further characterized in that according to embodiment, the output of detonation sensor is integrated and corrects, the pinking passes The output of sensor is to sample during the knock window of second cylinder, and wherein second cylinder is described Knock window be the expansion stroke of second cylinder during crankshaft degree section.

It is of the invention to be further characterized in that according to embodiment, to the described by integrating and correcting of the detonation sensor Output carry out low-pass filtering to provide first background noise level.

It is of the invention to be further characterized in that according to embodiment, make the described by integration and correction of the detonation sensor Output divided by the detonation sensor it is described by low-pass filtering by integrating and the output of correction is to determine that pinking is strong Degree is horizontal, and wherein pinking instruction is horizontal based on the knock intensity.

It is of the invention to be further characterized in that according to embodiment, it exits the first operator scheme and enters the second operation mould Formula, in the second operation mode, all cylinders all activity and via the controller according to relative to several Second background noise level of part and second cylinder of establishment provides the pinking instruction of second cylinder, the condition Including start first cylinder during the second cycle of engine the direct injector, first cylinder is described Burning fuel, second cycle of engine occur before entering the first operator scheme during engine with two recycles.

According to embodiment, the first operator scheme is wherein to deactivate at least during each circulation of the engine The mode of one cylinder.

According to the present invention, a kind of method of engine operation include: during the first circulation of modulated displacement engine via Controller operates the modulated displacement engine in the case where all cylinder all burning fuels；And from the first circulation phase Between detonation sensor output generate first group of cylinder background noise level；The of the modulated displacement engine Two circulation during via the controller in all cylinders burning fuel, and during the second circulation when The direct fuel injector of the first cylinder is deactivated in all cylinders when burning fuel, and from during the second circulation The detonation sensor output generate the second cylinder background noise level；It generates via the controller by described the One group of cylinder background noise level and the background noise level of second cylinder and the one or more of determination Pinking instruction；And it indicates via the controller in response to one or more of pinkings to adjust spark timing.

According to embodiment, all direct injectors of the engine are all in the first circulation phase of the engine Between operate.

It is of the invention to be further characterized in that according to embodiment, sequentially deactivate the direct combustion of the modulated displacement engine Each of material ejector to generate second group of cylinder background noise level, make an uproar by the background of second cylinder Sound level is included in second group of cylinder background noise level.

It is of the invention to be further characterized in that according to embodiment, it is grasped immediately in from the case where all cylinders are all activated Changing into the mode that at least one cylinder is deactivated as modulated displacement engine, application comes from second group of engine air later At least one cylinder background noise level of cylinder background noise level determines pinking.

It is of the invention to be further characterized in that according to embodiment, immediately under the mode that at least one cylinder is deactivated Application is from first group of engine air after operation modulated displacement engine changes into the mode that all cylinders are all activated At least one cylinder background noise level of cylinder background noise level determines pinking.

According to embodiment, port fuel injector, which is supplied during the second circulation to first cylinder, to be fired Material.

According to embodiment, the background noise level of second cylinder depends on whether direct fuel injector is opened It is dynamic.

According to embodiment, first group of cylinder background noise level is the output from multiple detonation sensor And it generates.

According to the present invention, a kind of system for operating engine is provided, the system includes modulated displacement engine, The modulated displacement engine includes the port fuel injector and direct fuel injector for each cylinder；With And controller, the controller include executable instruction, the executable instruction be stored in non-transitory memory with: in institute There is cylinder all to operate modulated displacement engine in the case where burning fuel；In all cylinders all in burning fuel when sequentially stop With the direct fuel injector of each cylinder；And from when in all cylinders all in burning fuel when deactivate at least one The detonation sensor output sampled when direct fuel injector generates the cylinder knocking ambient noise water of each cylinder It is flat.

It is of the invention to be further characterized in that for injecting fuel into hair via port fuel injector according to embodiment The extra instruction of motivation cylinder.

According to embodiment, of the invention be further characterized in that for indicating in response to pinking adjusts the additional of spark timing Instruction.

According to embodiment, the pinking instruction is based on the cylinder knocking background noise level.

According to embodiment, adjusting spark timing includes postponing spark timing.