阅读说明：本技术 操作内燃发动机的方法 (The method for operating internal combustion engine ) 是由 D·赫斯凯特 A·J·奥克利 于 2019-05-24 设计创作，主要内容包括：本申请公开了操作内燃发动机的方法。提供一种使发动机总成停机的方法,该发动机总成包括排气再循环系统,该排气再循环系统具有用于控制通过排气再循环系统的排气流的阀,该方法包括：a)关闭排气再循环系统的阀；b)将发动机总成的进气节气门维持在打开位置达预定时间段；c)在预定时间段之后切断对发动机的燃料供应,同时进气节气门处于打开位置。还提供了一种操作发动机总成以便选择发动机停机程序的方法。(This application discloses the methods of operation internal combustion engine.A kind of method shutting down engine assembly is provided; the engine assembly includes exhaust gas recycling system; the exhaust gas recycling system has the valve for controlling the exhaust stream by exhaust gas recycling system, this method comprises: a) closing the valve of exhaust gas recycling system；B) air inlet shutter of engine assembly is maintained into open position up to predetermined amount of time；C) the fuel supply to engine is cut off after predetermined time period, while air inlet shutter is in an open position.A kind of operation engine assembly is additionally provided so as to the method that selects engine shutdown procedure.)

1. a kind of method for shutting down engine assembly, the engine assembly includes exhaust gas recycling system, and the exhaust is again The circulatory system has the valve for controlling the exhaust stream by the exhaust gas recycling system, which comprises

A) valve of the exhaust gas recycling system is closed；

B) air inlet shutter of the engine assembly is maintained into open position up to a period；

C) it is cut off after the period and the fuel of the engine is supplied, while the air inlet shutter is in open position It sets.

2. according to the method described in claim 1, wherein in step c) substantially instantaneous trip to described in the engine Fuel supply.

3. according to the method described in claim 1, wherein the predetermined period is greater than or equal to 500ms and is less than or equal to 1000ms。

4. according to the method described in claim 1, wherein the air throttle maintains institute during step c) and after step c) Open position is stated, until the engine stop.

5. according to the method described in claim 1, wherein the method includes being greater than described start before executing step c) The revolving speed of the idling speed of machine runs the engine.

6. a kind of method for operating engine assembly, which comprises

Determine that the engine should be shut down；

Determine a possibility that forming condensate in the cylinder of the engine assembly after the engine has been shut down；

Engine shutdown procedure is selected based on the possibility for forming condensate；And

The engine shutdown procedure is executed so that the engine is shut down.

7. according to the method described in claim 6, wherein if it is determined that the possibility of condensate is then selected higher than first threshold The method according to any one of claims 1 to 5 is selected as the engine shutdown procedure.

8. according to the method described in claim 6, wherein if it is determined that the possibility of condensate is then selected lower than second threshold The engine shutdown procedure is selected, to make the minimum vibration of the engine between the engine shut-down.

9. according to the method described in claim 6, the method comprise the steps that determine the environmental characteristics of the engine, wherein It is determined according to the environmental characteristics of the engine and forms condensation in the cylinder after the engine has been shut down The possibility of object.

10. according to the method described in claim 9, wherein the environmental characteristics include from the temperature of the engine assembly and wet The one or more selected in degree.

11. according to the method described in claim 6, wherein the method includes determining present engine runing time, wherein root It is determined according to the present engine runing time and forms condensate in the cylinder after the engine has been shut down The possibility.

12. according to the method described in claim 6, wherein the method includes determine from previous engine shut down since when Between, wherein having been determined after the engine has been shut down according to the time since the previous engine is shut down in institute State the possibility that condensate is formed in cylinder.

13. according to the method described in claim 6, wherein the method includes determining the engine of previous engine run case Runing time, wherein according to the engine on time of the previous engine run case determine the engine The possibility of condensate is formed in the cylinder after shutting down.

14. a kind of engine assembly, comprising:

Internal combustion engine；

Exhaust gas recycling system has the valve for controlling the exhaust stream by the exhaust gas recycling system；And

Controller is configured to execute method according to claim 1 or 6.

15. a kind of motor vehicles comprising engine assembly according to claim 14.

Technical field

This disclosure relates to a kind of method for operating internal combustion engine, and be particularly but not exclusively related to operating internal combustion hair Method of the motivation to reduce the corrosion of fuel injector nozzle.

Background technique

Modern motor generally includes start-stop system, which is configured to work as and does not need to start The engine of motor vehicles is shut down when (for example, when vehicle is static at traffic signals) machine driving vehicle.In this way Stop engine by reducing the time quantum that engine idling is spent to reduce the fuel consumption of engine and the production of polluted gas It is raw.

Since engine may stop during single stroke and start repeatedly, therefore it is required that starting during stopping event The noise of machine, vibration and roughening (NVH) attribute are very good, so that in engine stop, driver experiences the minimum of vehicle Vibration is shaken.

In order to minimize the undesirable shake of engine during engine stop, vehicle usually implements " soft stop is stopped " Strategy is reduced by the strategy by the power of the mobile generation of engine piston.It includes using section that the soft stop being previously proposed, which stops strategy, The inlet manifold of valve sealing engine simultaneously continues to supply fuel to engine so that engine is continued to run until without enough Air be inhaled into cylinder with support burning and to stall (stall).

Engine is set to shut down the air pressure that can be reduced in inlet manifold in this way, to reduce sucking cylinder The pressure of air inlet.This in turn reduces the sizes of the power on the piston of engine, reduce the vibration of engine.

The combustion incident occurred shortly before to stall may make to leave not in cylinder after engine has stopped The combustion product being discharged from cylinder.Further, since the pressure difference at engine both ends, for example, inlet manifold and exhaust manifold it Between pressure difference, when an engine is stopped, exhaust can suck back cylinder from exhaust manifold.

Summary of the invention

According to an aspect of the present invention, a kind of method for shutting down engine assembly is provided, which includes Exhaust gas recycling system, the exhaust gas recycling system have the valve for controlling the exhaust stream by exhaust gas recycling system, should Method includes:

A) valve of exhaust gas recycling system is closed；

B) air inlet shutter of engine assembly is maintained into open position up to a period；

C) the fuel supply to engine is cut off after that period of time, for example, air inlet shutter is in open position simultaneously It sets.

The step of this method, executes in order.

In step c), can substantially instantaneous trip be supplied by the fuel of engine, for example, without gradually decreasing.

The period can be greater than or equal to 500ms and be less than or equal to 1000ms.For example, the period can be 700ms.The period can be determined based on the position of EGR valve before closing EGR valve in step a).Alternatively, the time Section can be predetermined period, for example, setting during engine assembly manufacture.

During step c) and after step c), air throttle can maintain open position, until engine stop.Change sentence It talks about, can permit engine reduces operation in the case where air throttle is opened.

This method may include before executing step c) to be greater than the idling speed of engine (for example, normal idling turns Speed) revolving speed run engine.This method may include execute step c) before increase engine idling speed or The running speed of engine is increased above idling speed before executing step c).

According to another aspect of the present disclosure, a kind of method for operating engine assembly is provided, this method comprises:

Determine that engine should be shut down；

It determines and forms condensate (condensation) in the cylinder of engine assembly after engine has been shut down A possibility that, for example, with the presence or absence of exhaust in engine cylinder after engine has been shut down；

A possibility that based on condensate, selects engine shutdown procedure, if it is determined that is higher than the first threshold a possibility that condensate Value then selects the above-mentioned method for shutting down engine assembly as pending engine shutdown procedure；And

Engine shutdown procedure is executed so that engine is shut down.

Engine assembly may include compression ignition engine.Engine assembly may include exhaust gas recycling system, the row Gas recirculating system has the valve for controlling the exhaust stream by exhaust gas recycling system.

Alternatively, if it is determined that it is lower than second threshold a possibility that condensate, then can choose engine shutdown procedure, To make the minimum vibration of engine between engine shut-down.For example, selected engine shutdown procedure may include Make engine before (for example, before being cut to the fuel of engine cylinder) reduction is supplied to the fuel quantity of engine cylinder The air inlet shutter of assembly is closed.Second threshold can be equal to first threshold or can be different from first threshold.

This method can include determining that the environmental characteristics of (for example, measurement or prediction) engine.It can be according to engine Environmental characteristics determine after engine has been shut down a possibility that condensate is formed in cylinder.

Environmental characteristics may include one or more of the temperature and humidity selected from engine assembly.Temperature can be hair Motivation coolant temperature, engine shell temperature (such as engine cylinder cover temperature), engine exhaust temperature and/or engine Inlet temperature.Humidity can be in engine the humidity of the air inlet of (such as in inlet manifold and/or cylinder of engine).

This method can include determining that present engine runing time, for example, the time since engine last time starts. The possibility for forming condensate in cylinder after engine has been shut down can be determined according to present engine runing time Property.For example, can determine that a possibility that forming condensate is low, for example, low if engine on time is higher than threshold time In first threshold and/or second threshold.

This method can include determining that the time since previous engine is shut down.It can be shut down according to from previous engine Since time determine after engine has been shut down a possibility that condensate is formed in cylinder.For example, if starting Machine is shut down recently, for example, the time since previous engine is shut down is lower than threshold time, then can determine the possibility of condensate Property is low.

This method can include determining that the engine on time of previous engine run case.It can be according to previously starting The engine on time of machine run case forms the possibility of condensate to determine after engine has been shut down in cylinder Property.

According to another aspect of the present disclosure, a kind of engine assembly is provided, comprising:

Internal combustion engine；

Exhaust gas recycling system has the valve for controlling the exhaust stream by exhaust gas recycling system；And

Controller is configured to execute the method according to any one of aforementioned aspects.

Internal combustion engine can be compression ignition engine.

Motor vehicles may include above-mentioned engine assembly.

In order to avoid the duplication of labour unnecessary in specification and text repeat, only about one or more side of the invention Face or embodiment describe certain features.It should be appreciated, however, that technically in feasible situation, about of the invention any Aspect or the feature of embodiment description can also be used together with any other aspect or embodiment of the invention.

Detailed description of the invention

It for a better understanding of the present invention, now will be by showing and in order to more clearly illustrate how to implement the present invention The mode of example refers to attached drawing, in which:

Fig. 1 is the schematic diagram of engine assembly；

Fig. 2 is the flow chart for describing the method for shutting down engine assembly；

Fig. 3 is the flow chart for describing another method for shutting down engine assembly；And

Fig. 4 is the flow chart for describing the method for operation engine assembly.

Specific embodiment

With reference to Fig. 1, engine assembly 100 (for example, for motor vehicles) includes gas handling system 110, internal combustion engine 120, exhaust system 140 and control system 150, control system 150 are configured to control the operation of engine assembly 100.

In some arrangements, motor vehicles can be hybrid vehicle, and engine assembly 100 can be used as mixing A part of the hybrid electric drive system of power car provides.In addition to engine assembly 100 or as to engine assembly 100 substitution, hybrid electric drive system, which may further include, can be controlled to provide to drive hybrid vehicle Power one or more electric motors or other driving devices.

Gas handling system 110 includes air inlet 112 and admission line 114.During the operation of engine 120, air via Air inlet 112 is inhaled into gas handling system 110 and is transported to the inlet manifold 122 of engine 120 by admission line 114.Air inlet System 110 includes air throttle 116, and air throttle 116 is configured to control the inlet air flow between air inlet 112 and inlet manifold 122. The position of air throttle 116 can be indirectly controlled for example, by controller from accelerating control to receive input.

Engine 120 includes inlet manifold 122, cylinder 124 and exhaust manifold 126.Piston 128 is arranged in cylinder 124 And it is configured to move back and forth in cylinder 124 during the burn cycle of engine 120.The combustion chamber 124a of cylinder 124 It is limited by the side of piston 128, the wall of cylinder 124 and cylinder cover 130.

Engine 120 further includes one or more inlet valves 132 and one or more exhaust valves 134, with control respectively into Enter the inlet air flow of cylinder 124 and leaves the exhaust stream of cylinder 124.

During induction stroke, piston 128 moves in cylinder 124 to increase the volume of combustion chamber 124a, to pass through Air inlet is sucked cylinder from inlet manifold 122 by inlet valve 132.After induction stroke, inlet valve 132 is closed, and with piston 128 It is moved back towards cylinder cover 130, the gas in cylinder 124 is compressed, to reduce the volume of combustion chamber 124a.

Fuel is ejected into cylinder 124 via one or more fuel injectors 136.Fuel injector includes at least partly Ground is arranged in cylinder or the fuel injection nozzle of neighbouring cylinder (for example, be aligned or be recessed in the wall of cylinder with the wall of cylinder) 136a.Nozzle 136a has by the hole of careful design size, to allow to spray the fuel quantity of measurement for each combustion incident It is mapped in cylinder 124.

Due to the high pressure and high temperature in the 124a of combustion chamber, air and fuel mixture in cylinder 124 are ignited.Air and The burning of fuel mixture generates the burning gases of expansion, acts on piston 128 and drives the crankshaft 138 of engine 120.

In the discribed arrangement of Fig. 1, engine 120 is compression ignition engine.However, it is also contemplated that the disclosure It can be applied to the engine of any other type, such as spark ignition engine, wherein the Fuel-air in cylinder 124 is mixed Object is closed by plug ignition.In addition, engine 120 may include any quantity although showing single cylinder 124 in Fig. 1 Cylinder, such as 2,3,4,6,8 or be more than 8 cylinders.

During the exhaust stroke of piston 128, the exhaust generated by the burning in cylinder is via exhaust valve 134 from cylinder 124 are discharged in exhaust manifold 126.

The exhaust pipe 142 of exhaust system 140 be arranged to will to be vented from exhaust manifold 126 be transported to exhaust outlet 144 with from Vehicle discharge.

As depicted in fig. 1, engine assembly 100 can also include turbocharger 170, and turbocharger 170 includes The exhaust gas driven turbine machine 172 being arranged in exhaust pipe 142 and the compressor 174 being arranged in admission line 114.Turbine 172 and compressor 174 be couple to same axis, compressor 174 is driven by turbine 172, with increase enter air inlet discrimination The pressure of the air inlet of pipe 122.

Engine assembly 100 further includes exhaust gas recirculatioon (EGR) system 160.Egr system 160 includes EGR conduit 162, EGR conduit 162 is configured to the gas handling system 110 of a part of exhaust gas recirculatioon to engine assembly 100, such as admission line 114 or inlet manifold 122.Egr system 160 further includes EGR valve 164, and EGR valve 164 is configured to control through EGR conduit 162 Exhaust stream.

Reduce the combustion that can be used for burning with a part of intake oxygen enrichment in the exhaust replacement engine cylinder 124 through burning Burn the volume of room 124a.It reduce the peak temperatures of burning, to reduce NO_XFormation.

In the arrangement shown in, egr system 160 is high pressure gas recirculating system, is configured to be vented from turbine The position of 172 upstream of machine is recycled to the position in the downstream of the compressor 174 relative to the inlet air flow in gas handling system 110.So And in other arrangements, engine assembly 100 can additionally or alternatively include low pressure exhaust recirculating system, be matched It is set to the position that exhaust is recycled to 174 upstream of compressor from the position in 172 downstream of turbine.

As reduction NO_XFormation and therefore reduce from motor vehicles discharge NO_XA kind of mode, exhaust gas recirculatioon makes With being becoming increasingly popular.In some arrangements, exhaust gas recirculatioon can make under the essentially all service condition of engine 120 With.

If using " soft stop is stopped " shutdown procedure (such as above procedure) to shut down engine, while in inlet manifold 122 And/or there are EGR gas in cylinder 124, then after engine has stopped, can protecting in the cylinder 124 of engine 120 Stay increased capacity.

Corrosion can be formed on fuel injector nozzle 136a by being retained in the exhaust in cylinder 124 after engine stop Property condensate, nozzle can be corroded, and therefore influence nozzle bore size.Therefore, stop shutdown procedure using soft stop and increase What is added can cause the corrosion of injector nozzle to increase together using exhaust gas recirculatioon, this may need to replace injector spray in advance Mouth 136a.

The control system 150 of engine assembly 100 includes controller 152, such as control unit of engine or power transmission It is control unit.Controller 152 may be configured to control air inlet shutter 116, EGR valve 164 and/or turbocharger turbine The operation of machine 172, to control power provided by the engine.

Start in addition, controller 152 or another controller may be configured to execute when determining that engine should be shut down The shutdown procedure of machine assembly 100.For example, can be inputted based on the control from driver (for example, using firing key or opening Close) determine that engine should be shut down.Alternatively, controller 152 or another controller can determine that engine should be made For a part of stop-start event or in order to be transformed into the only electrically operated period (for example, during this period, vehicle is by being arranged Electrical motor driven on vehicle) and shut down.

With reference to Fig. 2, controller 152 may be configured to stop the engine 120 of motor vehicles using soft method of shutting down 200 Machine.Method 200 includes first step 202, wherein closing EGR valve 164.This method further includes second step 204, wherein close into Throttle valve 116 flows to inlet manifold 122 to limit air inlet from entrance 112.In some arrangements, air inlet shutter 116 can With substantially sealed inlet manifold 122 (for example, being isolated with entrance 112).

By closing air inlet shutter 116, since gas is inhaled into engine cylinder 124, air inlet discrimination from inlet manifold 122 Pressure in pipe 122 starts to reduce.

After engine 120 runs a period after closing air inlet shutter 116, due to the sky in inlet manifold 122 Gas lacks, to stall.As noted previously, as the pressure when engine stop operation in inlet manifold is low, with engine The case where stopping when inlet manifold is in atmospheric pressure is compared, and the amplitude for the vibration that when engine stop generates reduces.

It may cause engine shutdown using soft method of shutting down 200 and form corrosivity on fuel injector nozzle 136a Condensate, even if EGR valve 164 is closed before closing inlet valve.As described above, formed on fuel injector nozzle 136a Corrosive condensate may cause the corrosion of fuel injector nozzle.

With reference to Fig. 3, in order to reduce the corrosion risk of fuel injector nozzle, controller 152 be may be configured to using hair Motivation closing method 300 shuts down engine 120.The step of method 300, can execute in order.

Engine closing method 300 includes first step 302, wherein closing EGR valve 164.It closes EGR valve and reduces exhaust again It is recycled to the rate of inlet manifold 122, and therefore reduces the exhaust stream for entering cylinder 124 from inlet manifold 122.

Method 300 further includes second step 304, wherein air inlet shutter 116 is maintained open position up to a period.

It can choose the period, so as to which enough air inlets is made to suck inlet manifold by air inlet shutter 116 122, to replace any exhaust being likely to be present in inlet manifold 122 and admission line 114, such as in first step 302 Existing exhaust before closing EGR valve 164.For example, the period can be greater than or equal to 500ms.

It can be based on the position of EGR valve 164 before executing method 300 and/or it is contemplated that EGR gas in inlet manifold Amount determine the period.For example, the situation in a partly opened position compared to the EGR valve before executing method 300, such as Fruit EGR valve 164 is in a fully open position, then the period can be longer.Alternatively, which can be the predetermined time Section, is not based on the current working of engine assembly 100 and changes.

It may not want that the period is too long so that driver recognizes to shut down in request engine (for example, passing through rotation Firing key) and engine stop between delay.It is thereby possible to select the period is less than or equal to 1000ms.In one kind In arrangement, which is the predetermined period of 700ms.

Method 300 further includes third step 306, wherein cutting off to engine 120 (for example, to cylinder 124 of engine) Fuel supply.It can substantially supply instantaneous trip fuel, not spray fuel for example, being reduced to as quickly as possible.Change sentence It talks about, fuel supply can be stopped without being gradually reduced.

While fuel shutoff, air throttle 116 can maintain open position.In addition, being cut off it in fuel supply While engine reduces operation afterwards, air throttle 116 can maintain open position.In this way, as engine reduces Operation, clean air can be drawn through inlet manifold 122 and cylinder 124, this can be discharged from cylinder 124 is burnt Exhaust.

The revolution executed by engine and the induction stroke number therefore executed by piston 128 can depend on firing in cutting The revolving speed of the front engine operation of material.For example, if engine fuel be cut off before with about 850RPM to 900RPM's Idling speed operation, then engine 120 (such as crankshaft 138 of engine) can execute 2 or 3 times completely after fuel cut-off Rotation.Therefore, each piston 128 of engine can execute 1 to 2 induction strokes, and clean air is inhaled in the intake stroke Enter in corresponding cylinder 124.

In some arrangements, in order to increase the revolution executed after fuel shutoff by engine 120, in third step In 306 before fuel shutoff, engine 120 can be run with the revolving speed for being greater than the normal idling speed of engine.For example, cutting Before disconnected fuel, the idling speed of engine can be increased, or engine can be run with the revolving speed for being greater than idling speed.

Compared with when soft method of shutting down 200 being used to stop engine, when shutting down engine in this way, it can subtract Few capacity being present in cylinder 124 in engine stop.Therefore, it can reduce on fuel injector nozzle 136a The formation of corrosive condensate and the corrosion risk of fuel injector nozzle.

However, because the pressure in inlet manifold 122 is substantially equal to atmospheric pressure when an engine is stopped, when hair The power generated when motivation stops, which has, to be greater than in the soft amplitude for shutting down procedure the power that 200 periods generated, and engine stops The vibration generated during machine is correspondingly bigger.

Accordingly, it may be desirable to during balanced engine closing method 300 reduce fuel nozzle 136a corrosion benefit with The increase of caused vibration.Because the vibration of engine assembly 100 may be for the driver of vehicle during shutdown It will be apparent that and the impression of engine or the non-correct operation of shock mitigation system may be provided, it may be necessary to only it is being likely to form Engine is shut down using closing method 300 in the case where corrosive condensate.

With reference to Fig. 4, controller 152 or another controller may be configured to application method 400 and select to be stopped using soft stop Program 200 still shuts down using engine closing method 300 engine 120.

Method 400 includes first step 402, wherein determining whether engine should shut down.For example, can be based on carrying out self-driving The control for the person of sailing inputs (for example, using firing key or switch) to determine that engine should be shut down.Alternatively, controller 152 or another controller can determine that engine should be as a part of stop-start event or in order to be transformed into only The electrically operated period and shut down.

Method 400 includes second step 404, wherein determination forms condensate after engine has been shut down in cylinder A possibility that (whether be retained in cylinder for example, being vented after engine stop).For example, it may be determined that formed condensate can Can property be above, lower than being also equal to threshold value.

Can based on engine assembly 100 environmental condition (such as engine cylinder temperature and/or the gas in cylinder Temperature or humidity) determine a possibility that forming condensate.Additionally or alternatively, it can be based on related to engine assembly The operation of one or more engines or downtime determine a possibility that forming condensate, as described below.

Fig. 1 is returned to, engine assembly 100 may include one or more temperature sensors, such as engine coolant temperature Sensor 182, intake manifold temperature sensor 184, cylinder head temperature sensor 186, exhaust gas temperature sensor 188 are spent, or is appointed What his engine assembly temperature sensor.Additionally or alternatively, engine assembly 100 may include one or more humidity Sensor, such as inlet manifold humidity sensor 192 or any other engine assembly humidity sensor.

Controller 152 can receive the survey from temperature sensor 182,184,186,188 and/or humidity sensor 192 Magnitude, and may be configured to (such as during second step 404 of method 400) and determined using the measured value in engine A possibility that condensate is formed in exhaust casing is shut down.

Additionally or alternatively, controller 152 is configured to present engine runing time (for example, from upper Since secondary starting engine run how long) determine after engine has been shut down in cylinder formed condensate can It can property.For example, can determine that a possibility that forming condensate is low if present engine runing time is higher than threshold time, For example, being lower than threshold value.Additionally or alternatively, present engine runing time is determined for the pre- thermometric of engine assembly Degree, predicted temperature is determined for a possibility that forming condensate, for example, with from temperature sensor 182,184,186, The identical mode of 188 measured value.

Controller 152 may be configured to determine previous engine runing time, for example, in the elder generation of engine assembly 100 The time that engine operation is spent during preceding operation time period.When controller 152 is configured to previous engine operation Between determine when engine is previously shut down engine assembly 100 predicted temperature.Additionally or alternatively, controller 152 can be with It is configured to store the measured value related with the prior operation period from engine assembly temperature and/or humidity sensor, example Such as, it is stored in memory associated with controller 152.

Controller 152 may be configured to determine the time since engine is previously shut down.It can be based on from engine Time since previously shutting down is come a possibility that determining the formation condensate in cylinder.Start for example, controller 152 can determine How long is machine not running, for example, shutting down the time between nearest engine start in previous engine, and can be at least The time for being based in part on engine not running determines the temperature of engine assembly.It is also based on engine when engine is shut down The storage temperature or predicted temperature (for example, together with present engine runing time) of assembly additionally determines engine assembly Temperature.

In general, controller 152 may be configured to consider engine operation for multiple prior operation periods of engine Time and engine shut down the time spent, to determine a possibility that forming condensate.For example, controller 152 can calculate At a period (such as 30 minutes, 1 hour, 2 hours before the engine that will execute is shut down or any other is desired Period) on total time for spending of engine operation and/or engine shut down the total time spent, and can be based on calculating Total time determines a possibility that forming condensate.

Method 400 further includes third step 406, wherein based on a possibility that forming condensate select engine shut down journey Sequence.For example, can choose soft stop if a possibility that forming condensate is equal to or less than threshold value and stop engine closing method 200.Alternatively, if a possibility that condensing is higher than the threshold value or another threshold value, it can choose engine closing method 300。

It will be understood by those skilled in the art that although being retouched by way of example with reference to one or more illustrative examples The present invention is stated, but the present invention is not limited to disclosed examples, and without departing substantially from this hair being defined by the following claims In the case where bright range, alternative exemplary can be constructed.