CN111810302A - Method for determining maximum output torque of gasoline engine - Google Patents

Method for determining maximum output torque of gasoline engine Download PDF

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CN111810302A
CN111810302A CN202010632793.4A CN202010632793A CN111810302A CN 111810302 A CN111810302 A CN 111810302A CN 202010632793 A CN202010632793 A CN 202010632793A CN 111810302 A CN111810302 A CN 111810302A
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torque
maximum
power system
engine
pressure
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CN111810302B (en
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秦龙
刘磊
赵宁
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Dongfeng Motor Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F02D2250/26—Control of the engine output torque by applying a torque limit

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention discloses a method for determining the maximum output torque of a gasoline engine, which is characterized by comprising the following steps: acquiring maximum request torque of a power system, characteristic torque outside an engine rack and engine starting limit torque; when the power system has a non-safety fault, the torque limit of the power system due to the non-safety fault is obtained at the same time, and when the power system has a safety fault, the torque limit of the power system due to the safety fault is obtained at the same time; the minimum value of the torque is taken as the maximum output torque. The invention ensures that the output torque of the power system does not exceed the maximum torque which can be provided by the power system, thereby improving the torque response precision of the power system; the limitation of the output torque caused by factors such as insufficient lubrication at the starting stage of the engine, non-safety failure and safety failure of the power system and the like is comprehensively considered when the maximum torque which can be provided by the power system is determined. The service life and reliability of the engine are improved, and the safety of the power system is improved.

Description

Method for determining maximum output torque of gasoline engine
Technical Field
The invention relates to the technical field of automobile power systems, in particular to a method for determining the maximum output torque of a gasoline engine.
Background
The existing electric control gasoline engine is generally controlled based on a torque model, and the output torque of the gasoline engine reflects the dynamic property, the drivability and the comfort of the gasoline engine. The maximum output torque needs to be considered in combination with the maximum torque requested at the future time and the maximum torque that the powertrain can provide.
The maximum requested torque at the future time refers to the torque capacity which can be rapidly provided by the gasoline engine and is used for limiting and protecting the required torque when a power system dynamically changes. The maximum requested torque is too large in the future, so that the required torque is too large suddenly, but the actual torque provided by the power system is small, so that the torque response accuracy of the power system is poor, and particularly when the torque changes in a direction, the system is even severely frustrated; too little maximum requested torque at a future time may result in insufficient system dynamics.
The maximum torque which can be provided by the power system refers to the optimal torque which is provided by the power system, and the maximum torque under the condition of different engine rotating speeds under the full throttle and the limited torque after the system is protected are comprehensively considered. How to determine the final maximum output torque taking these factors into account becomes critical to control dynamics and torque response accuracy.
China CN110562240A discloses a method for calculating torque capacity of a light hybrid power system, which is only based on the universal characteristic curve of an engine, obtains the maximum torque of the engine at the current rotating speed by using a table look-up method, and does not consider factors such as actual combustion condition and engine safety protection limitation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for determining the maximum output torque of a gasoline engine.
In order to achieve the above object, the present invention provides a method for determining a maximum output torque of a gasoline engine, characterized in that: acquiring maximum request torque of a power system, characteristic torque outside an engine rack and engine starting limit torque; when the power system has a non-safety fault, the torque limit of the power system due to the non-safety fault is obtained at the same time, and when the power system has a safety fault, the torque limit of the power system due to the safety fault is obtained at the same time; the minimum value of the torque is taken as the maximum output torque.
Further, the maximum requested torque of the power system is the maximum value of the maximum air quantity limiting torque and the corrected value of the air circuit torque.
Further, the maximum requested torque of the power system is the minimum value of the maximum air quantity limiting torque and the corrected value of the air circuit torque.
Further, the maximum requested torque of the power system is the average value of the maximum air quantity limiting torque and the air circuit torque correction value.
Further, the maximum requested torque M of the power systemEngMaxTrqComprises the following steps:
MEngMaxTrq＝r×MEngMaxTrq1+(1-r)×MEngMaxTrq2+C
wherein M isEngMaxTrq1Limiting the torque for the maximum air quantity; mEngMaxTrq2The gas circuit torque correction value is obtained; r is a weighting coefficient, and the value range is (0, 1); c is a fixed constant.
Further, the weighting coefficient r is a fixed value.
Further, the weighting coefficient r is obtained by performing table look-up or fuzzy control on the gravity center method according to the ratio of the pressure before the throttle to the pressure in the intake manifold and the change rate of the pressure in the intake manifold.
Further, characterized in that the maximum air amount limiting torque MEngMaxTrq1Comprises the following steps:
Figure RE-GDA0002648006240000021
wherein p isAirIMEPMaxThe gas path average of the current maximum gas limit value indicates the pressure in the cylinder; FMEPMaxIndicating the average pressure of the friction loss under the current maximum allowable gas amount; PMEPMaxThe average indicated pressure of the pumping loss under the current maximum allowable gas quantity is obtained; v is engine displacement, and N is the number of cylinders;
the gas path average indication in-cylinder pressure p of the current maximum gas limit valueAirIMEPMaxComprises the following steps:
pAirIMEPMax＝rBaseSprkEff×rhoFuelEnergyDensityMax×rFuelConvEffMax
wherein r isBaseSprkEffFor optimum ignition efficiency; rho (rho)FuelEnergyDensityMaxMaximum fuel energy density; r isFuelConvEffMaxThe combustion efficiency of the engine at the optimum air-fuel ratio.
Further, the gas path torque correction value MEngMaxTrq2Comprises the following steps:
Figure RE-GDA0002648006240000031
wherein M isEngAirTrqIs the gas circuit torque; p is a radical ofPreThrottleIs the throttle front pressure; p is a radical ofManifoldIs the intake manifold pressure.
Further, the gas path torque MEngAirTrqComprises the following steps:
Figure RE-GDA0002648006240000032
wherein p isAirIMEPIndicating the pressure in the cylinder for the average gas path under the current working condition; FMEP is the average indicated pressure of the friction loss of the current working condition, and PMEP is the average indicated pressure of the pumping loss of the current working condition;
the pressure p in the cylinder is averagely indicated by the gas path under the current working conditionAirIMEPComprises the following steps:
pAirIMEP＝rBaseSprkEff×rhoFuelEnergyDensity×rFuelConvEff
wherein rhoFuelEnergyDensityIs the fuel energy density; r isFuelConvEffIs the engine combustion efficiency at the current air-fuel ratio.
Further, the engine out-of-rack characteristic torque is obtained by calibration according to the engine rotating speed and the engine water temperature.
Further, the engine starting limiting torque is obtained by calibrating according to the running time of the engine and the starting water temperature in the engine starting stage.
The invention has the following beneficial effects:
1. and determining the maximum requested torque of the power system according to the maximum air flow limiting torque and the air path torque correction value, and determining the maximum output torque according to the minimum value of the maximum requested torque of the power system, the characteristic torque outside the engine stand, the starting limiting torque of the engine, the non-safety fault limiting torque of the power system and the non-safety fault limiting torque of the power system. Therefore, the output torque of the power system does not exceed the maximum torque which can be provided by the power system, and the torque response precision of the power system is improved.
2. The safety and reliability of the engine are improved. The limitation of the output torque caused by factors such as insufficient lubrication at the starting stage of the engine, non-safety failure and safety failure of the power system and the like is comprehensively considered when the maximum torque which can be provided by the power system is determined. The service life and reliability of the engine are improved, and the safety of the power system is improved.
Drawings
FIG. 1 is a schematic diagram of a method of determining maximum output torque according to the present invention.
FIG. 2 is a pressure ratio
Figure RE-GDA0002648006240000041
Membership functions of (a).
FIG. 3 is a graph showing the intake pressure change rate dpManifoldMembership functions of (a).
Fig. 4 is a membership function of the weighting coefficient r.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings, which are included to provide a more clear understanding of the invention, but are not intended to limit the invention.
As shown in FIG. 1, a method for determining the maximum output torque of a gasoline engine comprises the steps of firstly, respectively calculating the maximum air quantity limiting torque and the air path torque correction value to determine the maximum request torque of a power system; then acquiring the external characteristic torque of the engine rack and the starting limit torque of the engine; when the power system has a non-safety fault, the torque limit of the power system due to the non-safety fault is obtained at the same time, and when the power system has a safety fault, the torque limit of the power system due to the safety fault is obtained at the same time; and finally, taking the minimum value of the torques as the maximum output torque.
The maximum requested torque of the power system reflects the required torque of the power system at the future moment, the external characteristic torque of the engine bench, the engine starting limiting torque, the non-safety fault limiting torque of the power system and the safety fault limiting torque of the power system comprehensively reflect the maximum torque which can be provided by the power system, and the output torque of the power system can be prevented from exceeding the maximum torque which can be provided by the power system by taking the minimum value of the torque values, so that the torque response precision of the power system is improved. The limitation of the output torque caused by factors such as insufficient lubrication at the starting stage of the engine, non-safety failure and safety failure of the power system and the like is comprehensively considered when the maximum torque which can be provided by the power system is determined. The service life and reliability of the engine are improved, and the safety of the power system is improved.
In the technical scheme, the characteristic torque outside the engine rack is determined by looking up a table according to the cooling water temperature of the engine and the rotating speed of the engine, and the details are shown in table 1; the engine start-up limiting torque is provided to limit the torque request of the engine during the engine start-up phase. At this time, because the temperature of the cooling water of the engine is low and the running time of the engine is short, the temperature of the lubricating oil is low, the lubricating system is poor, and the risk of damaging the engine is caused. The engine start limiting torque is obtained by calibrating the engine running time and the engine starting water temperature, and is detailed in table 2.
TABLE 1 engine pedestal external characteristic torque, engine speed, and engine water temperature corresponding relation
Figure RE-GDA0002648006240000051
TABLE 2 engine start-up limiting torque, engine running time, and starting water temperature
Figure RE-GDA0002648006240000061
In the above technical solution, the non-safety failure of the power system refers to a failure that causes a large influence on the vehicle dynamic performance, economy or emission when the power system is out of order, for example, when a component of the supercharging system is out of order, the dynamic performance is too poor, and then the maximum output torque must be limited according to the engine speed; when the safety of the power system fails, the safety of the power system is threatened, for example, when a hardware processor of the controller fails, the maximum output torque is limited according to the rotating speed of the engine, and the limit torque of the safety failure of the power system is smaller than the limit torque of the non-safety failure of the power system.
In the above technical solution, when determining the maximum requested torque of the power system, the maximum air quantity limiting torque and the air circuit torque correction value need to be calculated respectively.
Maximum air volume limiting torque MEngMaxTrq1Comprises the following steps:
Figure RE-GDA0002648006240000062
wherein p isAirIMEPMaxThe air path average indication cylinder pressure of the current maximum air volume limit value is the average indication cylinder pressure determined based on the current combustion working condition and the throttle opening under the maximum air intake quantity; FMEPMaxIndicating the average pressure of the friction loss under the current maximum allowable gas amount; PMEPMaxThe average indicated pressure of the pumping loss under the current maximum allowable gas quantity is obtained; v is engine displacement, and N is the number of cylinders;
in the above formula, the gas path average of the current maximum gas limit indicates the in-cylinder pressure pAirIMEPMaxComprises the following steps:
pAirIMEPMax＝rBaseSprkEff×rhoFuelEnergyDensityMax×rFuelConvEffMax
wherein r isBaseSprkEffFor optimum ignition efficiency; rho (rho)FuelEnergyDensityMaxMaximum fuel energy density; r isFuelConvEffMaxThe combustion efficiency of the engine at the optimum air-fuel ratio.
Gas circuit torque correction value MEngMaxTrq2Comprises the following steps:
Figure RE-GDA0002648006240000071
wherein M isEngAirTrqThe gas path torque is the torque which is output after the throttle opening degree and the torque are adjusted in a coordinated manner; p is a radical ofPreThrottleIs the throttle front pressure; p is a radical ofManifoldIs the intake manifold pressure.
In the above formula, gas path torque MEngAirTrqComprises the following steps:
Figure RE-GDA0002648006240000072
wherein p isAirIMEPThe in-cylinder pressure is averagely indicated for the air path under the current working condition, and the in-cylinder pressure is averagely indicated based on the current combustion working condition and the opening of a throttle valve; FMEP is the average indicated pressure of the friction loss of the current working condition, and PMEP is the average indicated pressure of the pumping loss of the current working condition;
in the above formula, the gas path average indicates the in-cylinder pressure p under the current working conditionAirIMEPComprises the following steps:
pAirIMEP＝rBaseSprkEff×rhoFuelEnergyDensity×rFuelConvEff
wherein rhoFuelEnergyDensityIs the fuel energy density; r isFuelConvEffIs the engine combustion efficiency at the current air-fuel ratio.
The maximum requested torque of the power system reflects the dynamic property of the power system, and the gas circuit torque correction value reflects the fuel economy of the power system, so that the maximum requested torque of the power system can be set to be one of the maximum value, the minimum value and the average value of the maximum air quantity limiting torque and the gas circuit torque correction value according to the requirements of different vehicle types.
Preferably, the maximum requested torque M of the power systemEngMaxTrqCan be expressed as the following formula
MEngMaxTrq＝r×MEngMaxTrq1+(1-r)×MEngMaxTrq2+C
Wherein M isEngMaxTrq1Limiting the torque for the maximum air quantity; mEngMaxTrq2For gas path torque correction(ii) a r is a weighting coefficient, and the value range is (0, 1); c is a fixed constant, the value range is 0-3 Nm, the compensation of the estimation of the maximum output torque under the external characteristic working condition is realized, and the maximum output torque can reach the torque required by the external characteristic under the external characteristic working condition.
The weighting coefficient r may be set to a fixed value; or according to the throttle front pressure pPreThrottleWith pressure p in the intake manifoldManifoldRatio and intake manifold pressure change rate dpManifoldAnd the method is obtained by table look-up or by a fuzzy control gravity center method.
As one preferable example, as shown in fig. 2 to 4, the calculation method of the fuzzy control center of gravity method is as follows:
in this embodiment, input 1 of the fuzzy controller is the pressure ratio
Figure RE-GDA0002648006240000081
Pressure ratio
Figure RE-GDA0002648006240000082
Is { mf)11，mf12，mf13，mf14，mf15Is set to [0, 1 ]]The membership functions are shown in FIG. 2; input 2 of the fuzzy controller is the intake pressure rate of change dpManifoldRate of change of intake pressure dpManifoldIs { mf)21，mf22，mf23，mf24，mf25Is set to [ -200, 200 ] in the discourse domain]The membership functions are shown in FIG. 3;
the output of the fuzzy controller is a weighting coefficient r, and the fuzzy set of the weighting coefficient r is { mf31，mf32，mf33，mf34，mf35Is set to [0, 1 ]]The membership functions are shown in FIG. 4.
As shown in Table 1, the scheme adopts 25 fuzzy control rules, the fuzzy control rule thereof, the output weighting coefficient r and the input pressure ratio
Figure RE-GDA0002648006240000083
And intake pressure variationRate dpManifoldAnd (5) solving the fuzzy problem by a gravity center method to obtain an accurate value of the weighting coefficient r in a corresponding relation.
TABLE 1 fuzzy control rule for weighting coefficients
Figure RE-GDA0002648006240000084

Claims (12)

1. A method for determining the maximum output torque of a gasoline engine is characterized in that: acquiring maximum request torque of a power system, characteristic torque outside an engine rack and engine starting limit torque; when the power system has a non-safety fault, the torque limit of the power system due to the non-safety fault is obtained at the same time, and when the power system has a safety fault, the torque limit of the power system due to the safety fault is obtained at the same time; the minimum value of the torque is taken as the maximum output torque.
2. The method for determining the maximum output torque of a gasoline engine according to claim 1, characterized in that: and the maximum requested torque of the power system is the maximum value of the maximum air quantity limiting torque and the air circuit torque correction value.
3. The method for determining the maximum output torque of a gasoline engine according to claim 1, characterized in that: and the maximum requested torque of the power system is the minimum value of the maximum air quantity limiting torque and the air circuit torque correction value.
4. The method for determining the maximum output torque of a gasoline engine according to claim 1, characterized in that: the maximum requested torque of the power system is the average value of the maximum air quantity limiting torque and the air path torque correction value.
5. The method for determining the maximum output torque of a gasoline engine as defined in claim 1, wherein the powertrain maximum requested torque MEngMaxTrqComprises the following steps:
MEngMaxTrq＝r×MEngMaxTrq1+(1-r)×MEngMaxTrq2+C
wherein M isEngMaxTrq1Limiting the torque for the maximum air quantity; mEngMaxTrq2The gas circuit torque correction value is obtained; r is a weighting coefficient, and the value range is (0, 1); c is a fixed constant.
6. The method of determining the maximum output torque of a gasoline engine according to claim 5, characterized in that: the weighting coefficient r is a fixed value.
7. The method of determining the maximum output torque of a gasoline engine according to claim 5, characterized in that: the weighting coefficient r is obtained by performing table lookup according to the ratio of the pressure before the throttle to the pressure in the intake manifold and the change rate of the pressure in the intake manifold or by a fuzzy control center-of-gravity method.
8. The method for determining the maximum output torque of a gasoline engine as defined in any one of claims 2 to 5, wherein the maximum air amount limiting torque MEngMaxTrq1Comprises the following steps:
Figure FDA0002566048600000021
wherein p isAirIMEPMaxThe gas path average of the current maximum gas limit value indicates the pressure in the cylinder; FMEPMaxIndicating the average pressure of the friction loss under the current maximum allowable gas amount; PMEPMaxThe average indicated pressure of the pumping loss under the current maximum allowable gas quantity is obtained; v is engine displacement, and N is the number of cylinders;
the gas path average indication in-cylinder pressure p of the current maximum gas limit valueAirIMEPMaxComprises the following steps:
pAirIMEPMax＝rBaseSprkEff×rhoFuelEnergyDensityMax×rFuelConvEffMax
wherein r isBaseSprkEffFor optimum ignition efficiency; rho (rho)FuelEnergyDensityMaxMaximum fuel energy density; r isFuelConvEffMaxThe combustion efficiency of the engine at the optimum air-fuel ratio.
9. The method for determining the maximum output torque of the gasoline engine according to any one of claims 2 to 5, wherein the gas path torque correction value MEngMaxTrq2Comprises the following steps:
Figure FDA0002566048600000022
wherein M isEngAirTrqIs the gas circuit torque; p is a radical ofPreThrottleIs the throttle front pressure; p is a radical ofManifoldIs the intake manifold pressure.
10. The method for determining the maximum output torque of a gasoline engine as claimed in claim 9, wherein the gas path torque MEngAirTrqComprises the following steps:
Figure FDA0002566048600000023
wherein p isAirIMEPIndicating the pressure in the cylinder for the average gas path under the current working condition; FMEP is the average indicated pressure of the friction loss of the current working condition, and PMEP is the average indicated pressure of the pumping loss of the current working condition;
the pressure p in the cylinder is averagely indicated by the gas path under the current working conditionAirIMEPComprises the following steps:
pAirIMEP＝rBaseSprkEff×rhoFuelEnergyDensity×rFuelConvEff
wherein rhoFuelEnergyDensityIs the fuel energy density; r isFuelConvEffIs the engine combustion efficiency at the current air-fuel ratio.
11. The method for determining the maximum output torque of a gasoline engine according to claim 1, characterized in that: the external characteristic torque of the engine pedestal is obtained by calibrating according to the rotating speed of the engine and the water temperature of the engine.
12. The method for determining the maximum output torque of a gasoline engine according to claim 1, characterized in that: the engine starting limiting torque is obtained by calibrating according to the running time of the engine and the starting water temperature in the engine starting stage.
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