阅读说明：本技术 瞬时燃料转扭矩的内燃发动机效率状态评估方法 (The internal combustion engine efficiency state evaluating method of instant fuel torque ) 是由 A·康塞尔莱里 P·L·克劳德 P·奥兰多 A·摩根多 于 2019-05-07 设计创作，主要内容包括：一种确定发动机中的燃烧效率的方法,包括利用具有计算机存储器、处理器以及输入和输出的控制模块,处理器执行存储在存储器内的逻辑；通过设置在发动机上的第一传感器和设置在流体联接到发动机的排气系统中的第二传感器来感测数据,第一和第二传感器电连接到输入；在控制模块内接收由第一和第二传感器感测的数据；确定进入发动机的空气的氧气含量,确定氧化催化剂上游的排气的氧气含量；确定燃料的汽化潜热；确定与进入发动机的氧气燃烧的燃料喷射量；基于进入发动机的空气中的和排气中的氧气含量以及燃料的汽化潜热确定燃烧效率指数；调节燃料喷射量。(A kind of method of efficiency of combustion in determining engine, including the use of with computer storage, processor and the control module output and input, processor executes the logic being stored in memory；Data are sensed by the way that first sensor on the engine and the second sensor being arranged in the exhaust system for being fluidly coupled to engine is arranged, the first and second sensors are electrically connected to input；The data sensed by the first and second sensors are received within the control module；It determines the oxygen content for entering the air of engine, determines the oxygen content of the exhaust of oxidation catalyst upstream；Determine the latent heat of vaporization of fuel；Determine the fuel injection amount with the oxygen combustion for entering engine；Efficiency of combustion index is determined based on the latent heat of vaporization of oxygen content and fuel in the air for entering engine and exhaust；Adjust fuel injection amount.)

1. a kind of method of efficiency of combustion in determining internal combustion engine (ICE), comprising:

Using with it is multiple input, it is multiple output, computer-readable memory and processor control module, the processor quilt It is configured to execute the programmed logic being stored in the computer-readable memory；

By multiple first sensings for being arranged on the ICE and being electrically connected to the multiple input of the control module Device, and pass through the multiple input for being electrically connected to the control module and the row for being fluidly coupled to the ICE is set Multiple second sensors in gas system sense data；

The data sensed by the multiple first and the multiple second sensor are received in the control module；

It determines oxygen (O2) content for entering the air of the ICE and determines the O2 content of the exhaust of oxidation catalyst upstream；

Determine the latent heat of vaporization of fuel；

Determine the fuel injection amount of mono- combust of the O2 sensed in the air for needing and entering the ICE；

Described in the O2 content of the air, the exhaust of the oxidation catalyst upstream based on the entrance ICE O2 content and the latent heat of vaporization of the fuel determine efficiency of combustion index；And

Adjust fuel injection amount.

2. according to the method described in claim 1, wherein determining that the O2 content for entering the air of the ICE further comprises utilizing Air mass flow sensor in the multiple first sensor detects the air capacity into the ICE.

3. according to the method described in claim 1, wherein determining that the O2 content for entering the air of the ICE further comprises utilizing Manifold absolute pressure (MAP) sensor in the multiple first sensor detects the air capacity into the ICE.

4. according to the method described in claim 1, wherein determining that the O2 content of the exhaust further comprises using the multiple Oxygen sensor in second sensor detects the O2 content of the exhaust of the oxidation catalyst upstream.

5. according to the method described in claim 1, wherein determining that the latent heat of vaporization of the fuel further comprises using described more Fuel temperature sensor in a first sensor, the fuel temperature sensor be arranged in the burning line of the ICE with Sensing enters the temperature of the fuel of the ICE.

6. according to the method described in claim 1, further comprising determining the loading condition of the ICE.

7. according to the method described in claim 6, wherein determining that the loading condition of the ICE further comprises: receiving and come from institute The input of several sensors in multiple first sensors is stated, the multiple first sensor includes throttle position sensor (TPS) and accelerator pedal position (APP) sensor, and determine that the ICE is also to be turned off condition under loading condition Lower operation.

8. according to the method described in claim 7, wherein determining that the loading condition of the ICE further comprises according to air inlet temperature Degree, air quality flow and delivery temperature determine whether chamber temperature is higher than predetermined threshold.

9. according to the method described in claim 8, wherein when the engine operates under loading condition, according to engine Revolution calculates gain by integrating actual fuel injection quantities, wherein the actual fuel injection quantities are according in the exhaust The function of air quality flow and O2 concentration is estimated.

10. according to the method described in claim 8, wherein when the engine operates under the conditions of cutting, according to engine Revolution calculates gain by integrating actual fuel injection quantities, wherein the actual fuel injection quantities are zero and the gain It is the function of air quality flow and intake air temperature.

Summary of the invention

According to several aspects of the disclosure, in a kind of determining internal combustion engine (ICE) method of efficiency of combustion including the use of With multiple inputs, multiple outputs, computer-readable memory and processor control module, processor is configured to execute storage Programmed logic in computer-readable memory.This method further comprises by being arranged on ICE and being electrically connected to control Multiple first sensors of multiple inputs of molding block and be electrically connected to control module multiple inputs and be arranged in fluid Multiple second sensors in the exhaust system of ICE are connected to sense data, are received within the control module by multiple first Hes The data of second sensor sensing, and determine oxygen (O2) content into the air of ICE and determine oxidation catalyst upstream Exhaust O2 content.This method further comprises determining the latent heat of vaporization of fuel, determines and feels in needs and the air for entering ICE The fuel injection amount of mono- combust of O2 measured, the O2 content of the air based on entrance ICE, the exhaust of oxidation catalyst upstream O2 content and the latent heat of vaporization of fuel determine efficiency of combustion index；Adjust fuel injection amount.

In another aspect of the present disclosure, determine that the O2 content into the air of ICE further comprises passing using multiple first Air mass flow sensor detection in sensor enters the air capacity of ICE.

In the another aspect of the disclosure, determine that the O2 content into the air of ICE further comprises utilizing multiple first Manifold absolute pressure (MAP) sensor detection in sensor enters the air capacity of ICE.

At the another aspect of the disclosure, determine that the O2 content of exhaust further comprises utilizing the oxygen in multiple second sensors Gas sensor detects the O2 content of the exhaust of oxidation catalyst upstream.

In still yet another aspect of the present, the latent heat of vaporization for determining fuel further comprises using in multiple first sensors Fuel temperature sensor, the fuel sensed in the burning line of ICE into ICE is arranged in the fuel temperature sensor Temperature.

At the another aspect of the disclosure, a kind of method of the efficiency of combustion in determining internal combustion engine (ICE) is further wrapped Include the loading condition of determining ICE.

In the another aspect of the disclosure, determine that the loading condition of ICE further comprises receiving from multiple first sensings The input of several sensors in device, including throttle position sensor (TPS) and accelerator pedal position (APP) sensor, And determine that ICE is operated under loading condition or under the conditions of cutting.

In the another aspect of the disclosure, determine that the loading condition of ICE further comprises according to intake air temperature, air quality Flow and delivery temperature determine whether chamber temperature is higher than predetermined threshold.

In the another aspect of the disclosure, when engine operates under loading condition, according to the letter of engine revolution Number calculates gain by integrating actual fuel injection quantities, and actual fuel injection quantities are according to air quality flow and exhaust The function of middle O2 concentration is estimated.

In the another aspect of the disclosure, when engine operates under the conditions of cutting, according to the function of engine revolution Calculate gain by integrating actual fuel injection quantities, actual fuel injection quantities be zero and gain be air quality flow and The function of intake air temperature.

In still yet another aspect of the present, a kind of for determining the system packet of the efficiency of combustion in internal combustion engine (ICE) It includes and executes control logic and the control module with multiple inputs and multiple outputs.Multiple inputs and multiple outputs are electrically connected to and set Multiple first sensors and actuator on ICE are set, and multiple inputs and multiple outputs are electrically connected to setting and join in fluid Multiple second sensors and the actuator being connected in the exhaust system of ICE.The control logic includes for receiving by multiple first First control logic of the data sensed with multiple second sensors and actuator, for determining the oxygen into the air of ICE Second control logic of the O2 content of the exhaust of gas (O2) content and determining oxidation catalyst upstream, for determining the vapour of fuel The third control logic for changing latent heat, for based on the O2 content and combustion for entering the O2 content of IC, the exhaust of oxidation catalyst upstream The latent heat of vaporization of material determines the 4th control logic of efficiency of combustion index, and for adjusting fuel based on efficiency of combustion index 5th control logic of the amount of injection.

At the another aspect of the disclosure, the second control logic further comprises utilizing air mass flow sensor (MAF) Or manifold absolute pressure (MAP) sensor detects the air capacity into ICE.

At the another aspect of the disclosure, the second control logic further comprises detecting oxidation catalysis using oxygen sensor The O2 content of the exhaust of agent upstream.

At the another aspect of the disclosure, third control logic further comprises utilizing to be arranged in the burning line of ICE Fuel temperature sensor senses the temperature into the fuel of ICE.

In still another aspect of the invention, the system for determining the efficiency of combustion in internal combustion engine (ICE) is further wrapped Include the 6th control logic of the loading condition of determining ICE.

At the another aspect of the disclosure, the 6th control logic further comprises receiving from throttle position sensor (TPS) and the input of accelerator pedal position (APP) sensor, and determine that ICE is under loading condition or to cut off Under the conditions of operate.

In still another aspect of the invention, the 6th control logic further comprise according to intake air temperature, air quality flow and Delivery temperature determines whether chamber temperature is higher than predetermined threshold.

In still yet another aspect of the present, the 6th control logic further comprises the root when ICE is operated under that loading condition Gain is calculated by integrating actual fuel injection quantities according to engine revolution, wherein actual fuel injection quantities are according to air quality The function of O2 concentration is estimated in flow and exhaust.

In the another aspect of the disclosure, the 6th control logic further comprises the root when ICE is operated under the conditions of cutting Gain is calculated by integrating actual fuel injection quantities according to engine revolution, wherein actual fuel injection quantities are zero and gain It is the function of air quality flow and intake air temperature.

In still yet another aspect of the present, the burning effect in a kind of internal combustion engine (ICE) for determining propulsion system The system of rate includes executing control logic and the control module with multiple inputs and multiple outputs.Multiple inputs and multiple outputs It is electrically connected to multiple first sensors and the actuator being arranged on ICE, and multiple inputs and multiple outputs are electrically connected to and set Set multiple second sensors and actuator in the exhaust system for being fluidly coupled to ICE.The control logic includes for receiving By multiple first and the first control logic of multiple second sensors and the data of actuator sensing, for utilizing quality air stream Quantity sensor (MAF) or MAP sensor (MAP) determine oxygen (O2) content into the air of ICE and use In the second control logic of the O2 content for the exhaust for detecting oxidation catalyst upstream using oxygen sensor, for utilizing setting Fuel temperature sensor in the burning line of ICE is to sense temperature into the fuel of ICE and for determining fuel The third control logic of the latent heat of vaporization, for the O2 content based on the exhaust for entering the O2 content of IC, oxidation catalyst upstream with And the latent heat of vaporization of fuel determines the 4th control logic of efficiency of combustion index, for adjusting fuel based on efficiency of combustion index 5th control logic of the amount of injection is passed for receiving from throttle position sensor (TPS) and accelerator pedal position (APP) Sensor inputs and determines that ICE is the 6th control logic operated under loading condition or under the conditions of cutting, wherein When ICE is operated under loading condition, gain is calculated by integrating actual fuel injection quantities according to engine revolution, Middle actual fuel injection quantities are estimated according to the function of quality air stream and O2 concentration in exhaust, and are used for according to air inlet temperature Degree, air quality flow and delivery temperature determine whether chamber temperature is higher than the 7th control logic of predetermined threshold.

From datail description provided herein, further areas of applicability will become bright.It should be understood that description and tool The purpose that body example is merely to illustrate, it is no intended to limit the scope of the present disclosure.

Detailed description of the invention

Attached drawing described herein is for illustration purposes only, it is no intended to be limited the scope of the present disclosure in any way.

Fig. 1 is the schematic diagram of motor vehicle powertrain according to one aspect of the disclosure；

Fig. 2 is according to one aspect of the disclosure for assessing the instant fuel torque efficient state of internal combustion engine Method a part diagram；And

Fig. 3 is the instant fuel torque efficiency state for being used to assess internal combustion engine described according to an aspect of the present invention The flow chart of method.

Specific embodiment

It is described below and is substantially only exemplary, it is no intended to limit the disclosure, application or purposes.In order to clearly rise See, identifies similar element using identical reference label in the accompanying drawings.

Referring to Fig.1, dynamical system is shown, is generally indicated by appended drawing reference 10.In many aspects, dynamical system 10 With motor vehicles (not shown) to the utmost.Motor vehicles can be car, truck, SUV, van, semitrailer, tractor, public Automobile, offroad vehicle or any other such motor vehicles, without departing from the scope of the present disclosure or intention.Dynamical system 10 equipped with Drive the engine 12 of speed changer 14.In one example, engine 12 is internal combustion engine (ICE) 12, such as petrol power Engine, however engine 12 can be diesel engine, compressed natural gas (CNG) engine, propane engine or it is any its His such internal combustion engine.Speed changer 14 can be manual, automatic, multi-clutch or stepless transmission, or be led to by engine 12 Cross the electronics of any other type that corresponding torque converter or clutch 16 drive, pneumatic and/or hydraulic control speed change Device.Speed changer 14 can be manual, automatic, multi-clutch or electrodeless or any other type electronics, pneumatic and/or liquid The automotive transmission 14 of voltage-controlled system, without departing from the scope of the present disclosure or intention.Engine 12 includes multiple cylinders 18.It should manage Solution, although in the example of fig. 1, engine 12 includes eight cylinders, and engine 12 may include any number in 1 to 16 The cylinder 18 of amount.For example, it is envisioned that the engine with 1,2,3,4,5,6,8,10,12 and 16 cylinder.In some examples In, engine 12 can be rotary engine.In rotary engine 12, cylinder 18 can more accurately be described as rotary-piston Shell (not shown).Therefore, in the example of rotary engine 12, there can be any amount of rotary-piston shell in 1 to 6 Body.

Air 20 flows into engine 12 by air throttle 22 via inlet manifold 24.Air 20 is combined with fuel 26 and in gas Burning in cylinder 18.Fuel 26 is extracted out from fuel reservoir or fuel tank 28 via burning line 30.Fuel injector 32 from one Fuel 26 is extracted in item or a plurality of burning line 30, and fuel 26 is sprayed or is sprayed onto engine 12.In the first example, Referred to as the engine 12 of port injection (PI) engine 12 includes at least one fuel injector 32 for being installed to inlet manifold 22. Then, fuel 26 is inhaled into cylinder 18, and wherein, fuel 26 is combined with air 20, and the electric spark point generated by spark plug 34 Combustion.In the second example, engine 12 can be described as having direct injection (DI) engine of multiple fuel injectors 26, The multiple fuel injector 26 is mounted directly to engine 12 and fuel 26 is directly injected in cylinder 18, fires wherein The spark ignition that material 26 is mixed with air 20 and generated by spark plug 34.In another example, engine 12 may include peace It is attached to the injector 32 of inlet manifold 22 and is mounted directly to engine 12 and injects fuel directly into the cylinder of engine 12 Injector 32 in 18.In some instances, engine 12 has the single spark plug 34 for each cylinder 18.Other In example, engine 12 has multiple spark plugs 34 for each cylinder 18.Although engine 12 has described as each Cylinder 18 has one or two spark plug 34, but it is to be understood that according to the design of engine 12, other quantity can be used Spark plug 34.For example, not used in the compression ignition engine of such as diesel engine and gasoline compression ignition engine Spark plug 34.In another example, in order to precisely control the burning of air 20 and fuel 26 in cylinder 18, engine 12 3 or more spark plugs 34 can be installed.Ignition timing, i.e., each spark plug 34 produce the determination of pyrophoric timing by lighting a fire Controller 36 controls.Ignition controller 36 is non-universal electric control equipment, digital computer or processing with pre-programmed Device 38 is used to store such as control logic, instructs, the memory or non-transient computer-readable media 40 of the data such as look-up table, And multiple input/output peripheral equipments or port 42.Processor 38 is configured as executing control logic or instruction.Ignition control The attaching integrated circuits that device 36 can have Attached Processor 38 or communicate with processor 38, such as analyzing and determining outfit To the logic circuit of the pilot spark timing of each spark plug 34 of engine 12.

One denier air 20 and fuel 26 are combined and are lighted by spark plug 34, and exhaust 44 leaves cylinder 18 and enters exhaust duct 46.Exhaust duct 46 is a series of pipelines 48, and when being vented 44 from the discharge of dynamical system 10, exhaust 44 passes through pipeline 48.More specifically Ground, exhaust 44 flow through exhaust manifold 50 before entering catalyst 52.Catalyst 52 is to provide response location and urges The exhaust gas treatment device of agent material 54, the catalyst material 54 change the chemical component of exhaust 44 chemically to reduce exhaust 44 environment influences.In some instances, dynamical system 10 includes single catalyst 52, and in other examples, power System 10 includes multiple catalysts 52.In addition, catalyst 52 may include being designed to and 44 chemical components of specific exhaust 54 substrate of multiple catalysts material of interaction.Once exhaust 44 has already passed through catalyst 52, exhaust 44 passes through tail pipe 56 and dynamical system 10 is left into atmosphere.

In some instances, dynamical system 10 further includes electrically powered machine or motor 58 and provides electric energy to electric motor 58 Battery 60.Electric motor 58 can operate in one of motoring mode and generator mode.In motoring mode, electric motor 58 It is powered by battery 60 and drives speed changer 14, or directly drive the wheel of motor vehicles in some instances.In generator mould In formula, electric motor 58 is used to charge to battery 60.Obviously, other than electric motor 58, battery 60 can also be other vehicles Accessories.In some instances, ignition controller 36 generates the order that electric energy is directed to spark plug 34 from battery 60, from And generate spark.

Dynamical system 10 is managed by power train control module (PCM) 62.Similar to ignition controller 36, PCM 62 is non-through With control electronics, digital computer or processor 38 ' with pre-programmed, for storing such as control logic, instruction, The memory or non-transient computer-readable media 40 ' of the data such as look-up table and multiple input/output peripheral equipments or port 42'.Processor 38 ' is configured to execute control logic or instruction.PCM 62 can have Attached Processor 38 ' or and processor The attaching integrated circuits of 38 ' communications are such as converted into the efficiency of torque for analyzing the potential energy in fuel 26 by engine 12 Logic circuit.PCM 62 is by receiving input data, analysis input from the multiple sensors being arranged in entire dynamical system 10 Data simultaneously generate the response to input data to control the operation of dynamical system 10.Setting is sent to the response of input data Multiple actuators in entire dynamical system 10.

In one aspect, sky is measured by several in multiple sensors for being arranged in the air intake duct 64 of engine 12 20 amount of gas and volume.Sensor in air intake duct 64 includes air mass flow sensor (MAF) 66, intake air temperature sensor (IAT) 68 and MAP sensor (MAP) 70.The measurement of MAF 66 passes through air intake duct 64 and enters the air of engine 12 20 quality.The measurement of IAT 68 enters the temperature of the air 20 of engine 12 by air intake duct 64.MAP 70 measures inlet manifold The pressure of air 20 in 24.It should be appreciated that the design parameter depending on engine 12, air intake duct 64 can be equipped with MAF 66, some or all of IAT 68 and MAP 70, and in some instances, air intake duct 64 may include multiple MAF 66, IAT 68 and/or MAP 70.In addition, in some instances, some or all functions of MAF 66, IAT 68 and/or MAP 70 It can be incorporated into monolithic sensor hardware.For example, the function of MAF 66 and IAT 68 can be combined into single sensor.This Outside, throttle position sensor (TPS) 72 is arranged in air throttle 22, and determines throttle position data and send it to PCM 62。

Exhaust duct 46 is equipped at least one exhaust sensor 74.In one aspect, exhaust sensor 74 is mounted on catalysis In the stream of exhaust 44 before converter 52.In some instances, oxygen (O2) content of the sensing of exhaust sensor 74 exhaust 44.In In other examples, the temperature of the sensing of exhaust sensor 74 exhaust 44.In other examples, exhaust sensor 74 executes exhaust 44 O2 and temperature measurement.

Dynamical system 10 is further equipped with fuel sensor 76.In one aspect, fuel sensor 76 measures the ratio of fuel 26 Weight.On the other hand, fuel sensor 76 measures the temperature of fuel 26.Although fuel sensor 76 has described as to have and survey The specific gravity of fuel 26 or the ability of temperature are measured, but depends on the design requirement of dynamical system 10, fuel sensor 76 can be held The specific gravity and temperature of fuel 26 in row burning line 30 measure.

PCM 62 is at least received from MAF 66, IAT 68, MAP 70, TPS72, exhaust sensor 74 and fuel sensor 76 Sensing data.Then, control logic, instruction and the look-up table manipulation sensing data being stored in the memory 58 of PCM 62 And generate output data for controlling dynamical system 10.That is, output data is sent to multiple actuators to control dynamical system The operation of system 10.In one aspect, PCM 62 generates output data, and the position of the output data control air throttle 22 determines It is ejected into the volume and pressure of the fuel 26 in engine 12 via injector 32, and controls spark plug via ignition controller 36 34 ignition timing.At several aspects, PCM 62 also generates output data, and the output data is directly or via ignition controller The operation mode of 36 control electric motors 58.

Motor vehicles operator's (not shown) manipulates accelerator pedal 78 to adjust air throttle 22.More specifically, accelerator Pedal position sensor (APP) 80 generates the pedal position signal for being transmitted to PCM 62.PCM 62 is generated based on 80 signal of APP Throttle control signal.Throttle actuator (not shown) is based on throttle control signal and adjusts air throttle 22 to adjust to flow into and send out The air 20 of motivation 12.

Vehicle operators also brake activation pedal 82 is to adjust vehicle braking.When brake pedal 82 is activated, retarder location It sets sensor (BPP) 84 and generates 82 position signal of brake pedal for being transmitted to PCM 62.PCM 62 is generated based on 84 signal of BPP Brake control signal.Braking system (not shown) is based on 84 Signal Regulation vehicle braking of BPP to adjust car speed.In addition to APP Except 80 and BPP 84, engine speed sensor 86 is based on engine speed and generates signal.Come in addition, being based at least partially on From the actuator in the signal of APP 80, BPP 84 and engine speed sensor 86,62 order dynamical system 10 of PCM with pre- Fixed or programming mode operates.

Turning now to Fig. 2, and with continued reference to Fig. 1, the part side of the efficiency of combustion for estimating engine 12 is shown Method and its generally indicated with appended drawing reference 100.In frame 102, the O2 content of the sensing exhaust of exhaust sensor 74.In frame 104, The sensing of MAF 66 enters the quality of the air 20 of engine 12.In frame 106, the sensing of IAT 68 enters the air 20 of engine 12 Temperature.When combining MAF 66 to read, IAT 68 can be used for known density and oxygen content based on air 20 under known temperature Deng the oxygen content determined into the air 20 of engine 12.In frame 108, fuel sensor 76 determines the combustion for entering engine 12 The temperature of material 26.It is similar with the oxygen content of air 20 at a given temperature, the quality (specific gravity) and combustion of fuel 26 can be passed through The temperature determination of material 26 includes the amount of the energy in the fuel 26 of predetermined amount.In frame 110, PCM 62 collect frame 102,104, 106 and 108 data sensed, and processor 38 ' based in the memory 40 ' for being stored in PCM 62 data and program patrol Collect the estimation to determine efficiency of combustion.

Turning now to Fig. 3, and continue to refer to figure 1 be described in more detail in that the frame 110 of Fig. 2 executes with 2 continuously generate combustion Burn the method for efficiency estimation.Method starts from frame 200.In frame 202, the amount for entering the air 20 of engine 12 is determined.Such as preceding institute It stating, MAF 66, IAT 68 and MAP 70 in some applications read the characteristic for entering the air 20 of engine 12, and PCM 62 determines the total amount for entering the air of engine 12 based on MAF 66, IAT 68 and MAP 70 reading, more specifically, determining Into the total amount of the oxygen of engine 12.Amount of oxygen in frame 204, the sensing of exhaust sensor 74 exhaust 44.Then, this method Frame 206 is proceeded to, wherein entering the temperature of the air 20 of air intake duct 64 by the measurement of IAT 68.

In frame 208, PCM 62 uses the data from MAF 66, IAT 68, MAP 70 and exhaust sensor 74, Huo Zhegeng The data of the sensor in air intake duct 64, exhaust duct 46 and the data of fuel sensor 76 are widely used, to generate It is ejected into the estimation of the amount of the fuel 26 in engine 12.The estimation of the amount for the fuel 26 to be sprayed follows following formula:

WhereinIt is into the quality of the air 20 of engine 12, λ is current air fuel ratio, λ_STIt is about 14.7:1 Ideal stoichiometric air-fuel ratio, and ρ is the density of the fuel 26 sensed by fuel sensor 76.

In frame 210, PCM 62 determines whether motor vehicles operator has made torque request and dynamical system 10 is It is no to be in load condition.In other words, PCM 62 determines whether (APP) 80 indicates to have made torque request.If operator is Torque request is made, then efficiency of combustion estimation 110 proceeds to frame 212, wherein 62 computational load energy term of PCM.In several sides Face, load energy item are to be transmitted to cylinder 18, are more specifically transmitted to the thermal energy or heat of the combustion chamber of the cylinder 18 of engine 12 Amount measurement.At several aspects, load energy item is the operation that PCM 62 is used to make dynamical system 10 in subsequent calculating It is adapted to the calculated value of sensor ageing effect and deviation at any time.According to the oxygen content of air 20 and enter engine 12 Fuel 26 amount function, load energy item is the measurement for being transmitted to the heat of combustion chamber, into 12 fuel 26 of engine Amount is weighted using gain and is integrated according to engine revolution.Gain is used in the factor for calculating efficiency of combustion index, only considers combustion The contribution of 26 pairs of the material combustion chambers by thermal energy or the cylinder 18 of heat introducing engine 12.The chemistry of diesel combustion is used for by inverting Formula is measured, estimates the actual amount of the fuel 26 of injection indirectly via the oxygen concentration in MAF 66 and exhaust 44.Later, it burns Efficiency estimation proceeds to frame 214, and wherein PCM 62 calculates efficiency of combustion index, will be described in greater detail below.

However, if PCM 62 determines that motor vehicles operator does not make torque request, and engine in frame 210 In closed throttle or " dragging " condition, then method proceeds to frame 216.When engine 12 is in closed throttle or " dragging " When condition, dynamical system 10 is with the operation of deceleration fuel cutoff (DCFO) mode.When dynamical system 10 is in DCFO mode, cutting Supply of the fuel 26 to engine 12, to reduce the amount of the thermal energy for being transmitted to engine 12 or heat.In frame 216, PCM 62 is counted Calculate the energy term pulled.In several aspects, the energy term of dragging is similar with load energy item, is PCM 62 in subsequent meter Calculated value used in calculation, for adapting the operation of dynamical system 10 to sensor ageing effect and deviation at any time.Root According to the function of the temperature of the quality and air 20 for the air 20 for entering engine 12, pulling energy term is the cylinder 18 from engine The thermal energy of removal or the measurement of heat, are weighted using gain and are integrated according to the revolution of engine 12.As described above, gain be Factor used in the calculating of efficiency of combustion index only considers the cylinder 18 that 26 pairs of fuel introduce thermal energy or heat in engine 12 The contribution of combustion chamber.After calculating dragging energy term, method proceeds to frame 214, and wherein PCM 62 calculates efficiency of combustion index.

Efficiency of combustion index is the integral of load energy item and dragging or DFCO energy term and the correction factor of application.Several A aspect, correction factor is the latent heat of fuel 26, therefore there are following equation:

∫ (load-DFCO) d θ+fuel latent heat (2).

Therefore, when operator has made torque request and dynamical system 10 operates under that loading condition, burning effect Rate index is weighted into the amount for being conducive to enter from fuel 26 energy of dynamical system 10, and when dynamical system 10 is in the condition of dragging When lower operation, efficiency of combustion index is weighted to be conducive to leave the amount of the energy of dynamical system 10 in the form of heat.In frame 214 The efficiency of combustion index of calculating allows PCM 62 to consider sensor and/or actuator aging and/or deviation.

When the sensor in dynamical system 10 and when actuator aging, sensors with auxiliary electrode and actuator may deviate it initially Specified calibration.Therefore, when the sensor in dynamical system 10 and when actuator aging, the sensor and actuator it is accurate Property and accuracy may be decreased.Accordingly, it is desirable to when receiving input data from sensor and actuator, and when guidance When actuator in dynamical system 10 executes function, PCM 62 considers aging effect and calibration deviation.It is a small amount of to adjust (SQA) strategy Help to provide consideration for PCM 62 and adjusts the mode of sensor and actuator aging effect and deviation.In one example, SQA is by the acceleration in DCFO period analysis engine 12, and the crankwheel for more specifically analyzing engine 12 (does not show Acceleration out) measures the departure of the fuel injector 32 in a small amount of region.The acceleration of crankwheel and the combustion of known quantity Burning of the material 26 in single cylinder 18 is directly related.In order to only measure the residual quantity error of fuel injector 32, SQA must be can It is executed under duplicate burning condition.The method of efficiency of combustion index and the efficiency of combustion for estimating engine 12 provides generation The mode of this repeatable burning condition.In another example, SQA can be used for through the song in DFCO period analysis engine 12 The acceleration of handle wheel measures the departure of the fuel injector 32 in a small amount of region.As DCFO example, crankwheel adds Speed is directly related to burning of the fuel of known quantity 26 in single cylinder 18.

Referring again to the method for estimating efficiency of combustion, once PCM 62 has calculated that efficiency of combustion index, the party Method proceeds to frame 218, and wherein PCM 62 adjusts fuel injection amount and one or more injectors 32 is ordered to be ejected into fuel 26 In engine 12.In frame 220, this method terminates and returns to frame 200, wherein this method continuous operation.

The method of the instant fuel torque efficiency for assessing internal combustion engine of the disclosure provides several advantages.This A little includes the ability of automatically and continuously real-time response sensor and actuator aging effect and calibration deviation.This method also makes With existing hardware and data connection, to reduce cost and improve reliability, creation is backed up and maintains compliance.The disclosure Description is substantially only exemplary, and the variation for not departing from the main points of the disclosure is intended within the scope of this disclosure.This A little variations are not regarded as a departure from the spirit and scope of the invention.