CN111396208B - Oil injection control method for vehicle equipped with direct injection engine - Google Patents
Oil injection control method for vehicle equipped with direct injection engine Download PDFInfo
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- CN111396208B CN111396208B CN202010204079.5A CN202010204079A CN111396208B CN 111396208 B CN111396208 B CN 111396208B CN 202010204079 A CN202010204079 A CN 202010204079A CN 111396208 B CN111396208 B CN 111396208B
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/703—Atmospheric pressure
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of automobile control, in particular to an oil injection control method for a vehicle with a direct injection engine. The fuel injection activation condition comprises an activation condition based on fuel rail fuel pressure and an activation condition based on the number of the engine operation cycles, and fuel injection is allowed when the two activation conditions are met; the activation condition based on the fuel rail fuel pressure means that the current fuel rail pressure value is larger than the minimum fuel rail fuel pressure determined based on the current water temperature of the engine and the ambient atmospheric pressure of the engine; the activation condition based on the number of engine operating cycles means that the number of actual engine operating cycles is greater than the minimum number of engine operating cycles determined based on the current water temperature of the engine. The invention fully considers the control method of various factors influencing the fuel atomization effect, considers the influence of water temperature, atmospheric pressure and the number of the engine operation period on the fuel atomization effect, and selects the most reasonable fuel injection control scheme so as to achieve the optimal fuel injection effect.
Description
Technical Field
The invention relates to the technical field of automobile control, in particular to an oil injection control method for a vehicle with a direct injection engine.
Background
For a direct injection engine, fuel is directly injected into a cylinder, and a certain oil pressure is needed to ensure that oil-gas mixture atomization achieves a good result, but when the oil pressure is too high, power loss and electromagnetic valve working power consumption are caused due to too large fuel pressurization, and local concentration and unevenness of gas mixture in the cylinder are easily caused by injecting high-pressure fuel to the cylinder wall.
Therefore, the injection activation of the direct injection engine needs to be performed under a certain oil pressure to improve the atomization effect. Chinese patent No. CN201110457568.2 entitled "high pressure start control method for direct injection gasoline engine" discloses a method for controlling the start fuel of a direct injection engine, which proposes that after the number of engine cycle cycles reaches the maximum number of engine cycle cycles obtained based on the starting water temperature, and the fuel pressure in the fuel rail exceeds the minimum fuel pressure based on the starting water temperature, the high pressure oil pump is operated to start at high pressure, otherwise, the low pressure oil pressure is started. There are problems that: the starting water temperature in the scheme is only used as a judgment condition for high-pressure starting or low-pressure starting, the fuel pressure in actual operation does not take the starting water temperature as a reference factor, but the fuel atomization effect in the starting process is different at different water temperatures, the starting oil pressure is set based on the current actual water temperature, the effect is better, and the scheme does not consider the air pressure condition.
Disclosure of Invention
The present invention is directed to solving the above-mentioned problems of the background art, and provides a fuel injection control method for a vehicle equipped with a direct injection engine.
The technical scheme of the invention is as follows: a fuel injection control method for a vehicle equipped with a direct injection engine, characterized in that: when the oil rail pressure sensor, the high-pressure oil pump and the low-pressure oil pump do not have any faults, oil injection is allowed only when the oil injection activation condition is met; the oil injection activation condition comprises an activation condition based on the fuel pressure of an oil rail and an activation condition based on the number of the running periods of the engine, and oil injection is allowed only when the two activation conditions are met simultaneously;
the activation condition based on the fuel rail fuel pressure refers to the condition that the current fuel rail pressure value is larger than the minimum fuel rail fuel pressure determined based on the current water temperature of the engine and the ambient atmospheric pressure of the engine;
the activation condition based on the number of engine operation cycles refers to a case where the number of actual engine operation cycles is greater than the minimum number of engine operation cycles determined based on the current water temperature of the engine.
The method for calculating the minimum fuel rail fuel pressure determined based on the current water temperature of the engine and the ambient atmospheric pressure of the engine comprises the following steps: selecting the maximum value of the minimum fuel rail fuel pressure of the fuel injection activation determined based on the current water temperature of the engine and the minimum fuel rail fuel pressure of the fuel injection activation determined based on the atmospheric pressure of the environment where the engine is located as the final minimum fuel rail fuel pressure, wherein the calculation formula is as follows,
pInjectionPermitMin＝Max[f1(TCoolant),f2(pAmbient)] (1)
wherein: p is a radical ofInjectionPermitMin-minimum rail fuel pressure;
TCoolant-current water temperature of the engine;
pAmbient-the ambient atmospheric pressure at which the engine is located.
The further calculation method of the minimum number of the engine operation cycles determined based on the current water temperature of the engine comprises the following steps: the minimum number of engine operation cycles determined based on the current water temperature of the engine is calculated according to the following formula,
CntEnginecyclesMin＝f4(TCoolant) (2)
wherein: cntEnginecyclesMin-a minimum number of engine operating cycles;
TCoolant-current water temperature of the engine.
And further, the actual operation cycle times of the engine refer to the actual operation times of the engine, the engine operates for one circle, the actual operation cycle times of the engine are accumulated by 1, after the engine is completely stopped, the actual operation cycle times of the engine are cleared, and the calculation is restarted after the engine is started next time.
Further, when the fuel injection activation condition based on the fuel rail fuel pressure or the fuel injection activation condition based on the number of engine operation cycles is not satisfied, the fuel injection is not allowed, and the fuel injection non-allowed number Cnt is determined every time the fuel injection is not allowedFuelInjectionInhibitAccumulating for 1; when the fuel injection inadmissible times Cnt are detectedFuelInjectionInhibitWhen N is exceeded, a rationality fault Error of the oil injection control system can be reported; by reducing the minimum rail fuel pressure p when a fuel injection control system rationality fault Error is detectedInjectionPermitMinIncreasing the minimum number of engine operation cycles CntEnginecyclesMinThe fuel injection quantity is measured from m before the occurrence of the fuel injection control system rationality fault ErrorFuelFinalIncreasing to m after detecting fuel injection control system rationality fault ErrorFuelFinalNewThereby starting the engine.
Further fuel injection control system combination is detectedAfter a rational failure Error, m is calculated according to the following formulaFuelFinalNew，
mFuelFinalNew＝mFuelFinal×f5(TCoolant,nEng)×f6(pAmbient,nEng) (3)
Wherein: m isFuelFinalNewDetecting the fuel injection quantity after the fuel injection control system rationality fault Error;
mFuelFinaldetecting the fuel injection quantity before the fuel injection control system rationality fault Error;
nEng-the current rotational speed of the engine;
TCoolant-current water temperature of the engine;
pAmbient-the ambient atmospheric pressure at which the engine is located.
And further, when the oil rail pressure sensor and the high-pressure oil pump have any faults, the high-pressure oil pump does not work, and the low-pressure oil pump starts to start oil injection when the actual operation cycle number of the engine is greater than the minimum engine operation cycle number determined based on the current water temperature of the engine.
And further, when the low-pressure oil pump has any fault, oil injection is forbidden, and the engine is forbidden to start.
Further, the injection disallowed times CntFuelInjectionInhibitStoring Error with the rationality fault of the oil injection control system in an EEPORM of the control system, namely after the engine is completely stopped and the control system is completely powered off, the number Cnt of fuel injection unallowable timesFuelInjectionInhibitAnd the fuel injection control system rationality fault Error is not erased.
The further judgment of the activation condition based on the fuel pressure of the fuel rail is only carried out once between the starting and the stopping of the engine, if the activation condition is met once, the judgment is kept in an activated state until the engine is completely stopped, and the judgment of the activation condition is carried out again when the engine is started next time.
The fuel injection control method for the vehicle with the direct injection engine fully considers various factors influencing the fuel atomization effect, considers the influences of water temperature, atmospheric pressure and the number of the engine operation cycles on the fuel atomization effect, selects the most reasonable fuel injection control scheme so as to achieve the optimal fuel injection effect, can also solve some fault problems through fuel injection control, and has great popularization value.
Detailed Description
The present invention will be described in further detail with reference to examples.
The embodiment divides the injection control of the engine into three types according to the running conditions of the oil rail pressure sensor, the high-pressure oil pump and the low-pressure oil pump.
First, when the rail pressure sensor, the high-pressure oil pump, and the low-pressure oil pump are not in any fault, the injection is allowed only when the activation condition of the injection is satisfied, the activation condition of the injection includes the activation condition based on the rail fuel pressure and the activation condition based on the number of the engine operation cycles, the injection is allowed only when the two activation conditions are satisfied simultaneously, otherwise, the injection is not allowed.
The activation condition based on the fuel rail fuel pressure refers to a condition where the current fuel rail pressure value is greater than a minimum fuel rail fuel pressure determined based on the current water temperature of the engine and the ambient atmospheric pressure at which the engine is located. Whether the vehicle is a gasoline only engine or a hybrid vehicle, the minimum rail fuel pressure may be determined according to the method of the present embodiment.
The specific calculation is performed as follows: selecting the maximum value of the minimum fuel rail fuel pressure of the fuel injection activation determined based on the current water temperature of the engine and the minimum fuel rail fuel pressure of the fuel injection activation determined based on the atmospheric pressure of the environment where the engine is located as the final minimum fuel rail fuel pressure, wherein the calculation formula is as follows,
pInjectionPermitMin＝Max[f1(TCoolant),f2(pAmbient)]
wherein: p is a radical ofInjectionPermitMin-minimum rail fuel pressure;
TCoolant-current water temperature of the engine;
pAmbient-hairThe motive is at ambient atmospheric pressure.
f1(TCoolant) Based on the current water temperature T of the engineCoolantMinimum rail fuel pressure for a determined activation of injection, where f2(pAmbient) Based on the current atmospheric pressure pAmbientThe determined minimum rail fuel pressure for the activation of the injection. Under the same engine water temperature condition, the hybrid vehicle has higher engine starting rotating speed, so the minimum fuel rail fuel pressure determined based on the engine water temperature is larger than the minimum fuel rail fuel pressure determined based on the engine water temperature of the pure gasoline engine, and the setting mode is favorable for the atomization effect in the starting process.
Taking an engine of a certain model as an example, the vehicle is a pure gasoline engine, and a comparison table of minimum fuel rail fuel pressure of fuel injection activation and engine water temperature determined based on engine water temperature is shown in table 1.
Table 1: comparison table of engine water temperature of certain vehicle type and minimum fuel rail fuel pressure of fuel injection activation determined based on engine water temperature
Taking an engine of a certain model as an example, the vehicle is a hybrid vehicle, and a comparison table of minimum fuel rail fuel pressure of fuel injection activation and engine water temperature determined based on engine water temperature is shown in table 2.
Table 2: comparison table of engine water temperature of certain vehicle type and minimum fuel rail fuel pressure of fuel injection activation determined based on engine water temperature
Similarly, for a vehicle engine, the table of the minimum rail fuel pressure for fuel injection activation determined based on the ambient barometric pressure of the engine and the ambient barometric pressure of the engine is shown in table 3.
Table 3: comparison table of ambient atmospheric pressure of engine of certain vehicle type and minimum fuel rail fuel pressure of fuel injection activation determined based on ambient atmospheric pressure of engine
The activation condition based on the fuel pressure of the fuel rail is judged only once between the starting and the stopping of the engine, if the activation condition is met once, the judgment is kept in an activation state until the engine is completely stopped, and the judgment of the activation condition is carried out again when the engine is started next time.
The activation condition based on the number of engine operation cycles refers to a case where the number of actual engine operation cycles is greater than the minimum number of engine operation cycles determined based on the current water temperature of the engine. The number of the actual running period of the engine refers to the actual running number of the engine, the engine runs for one circle, the number of the actual running period of the engine is accumulated by 1, after the engine is completely stopped, the number of the actual running period of the engine is reset, and the calculation is restarted after the engine is started next time.
The minimum number of engine operation cycles is determined based on the current water temperature of the engine, and the specific determination method calculates the minimum number of engine operation cycles determined based on the current water temperature of the engine according to the following formula,
CntEnginecyclesMin＝f4(TCoolant)
wherein: cntEnginecyclesMin-a minimum number of engine operating cycles;
TCoolant-current water temperature of the engine.
Taking an engine of a certain vehicle type as an example, a comparison table of the minimum number of engine operation cycles of fuel injection activation determined based on the current water temperature of the engine and the current water temperature of the engine is shown in table 4.
Table 4: comparison table of current water temperature of engine of certain vehicle type and minimum engine operation cycle number of fuel injection activation determined based on current water temperature of engine
And when the two activation conditions are met, namely the current oil rail pressure value is greater than the minimum oil rail fuel pressure determined based on the current water temperature of the engine and the ambient atmospheric pressure of the engine, and the actual operation cycle number of the engine is greater than the minimum engine operation cycle number determined based on the current water temperature of the engine, the high-pressure oil pump can inject oil, otherwise, the oil injection is not allowed.
Each time an impermissible injection is detected, the impermissible injection times CntFuelInjectionInhibitAccumulating for 1; when the fuel injection inadmissible times Cnt are detectedFuelInjectionInhibitWhen N is exceeded (N is equal to 3), a rationality fault Error of the oil injection control system can be reported; by reducing the minimum rail fuel pressure p when a fuel injection control system rationality fault Error is detectedInjectionPermitMinIncreasing the minimum number of engine operation cycles CntEnginecyclesMinThe fuel injection quantity is measured from m before the occurrence of the fuel injection control system rationality fault ErrorFuelFinalIncreasing to m after detecting fuel injection control system rationality fault ErrorFuelFinalNewThereby starting the engine. Number of impermissible fuel injections CntFuelInjectionInhibitStoring Error with the rationality fault of the oil injection control system in an EEPORM of the control system, namely after the engine is completely stopped and the control system is completely powered off, the number Cnt of fuel injection unallowable timesFuelInjectionInhibitAnd the fuel injection control system rationality fault Error is not erased.
I.e., to reduce the minimum allowable oil pressure for starting after a fault and to allow the number of engine operating cycles to be increased to start the engine at the expense of fuel atomization and extended engine start time. The specific operation is carried out according to the following formula,
pInjectionPermitMinNew＝pInjectionPermitMin×C1
wherein: p is a radical ofInjectionPermitMinNew-reduced minimum rail fuel pressure;
pInjectionPermitMin-minimum rail fuel pressure;
C1-is a constant of 0.85;
CntEnginecyclesMinNew＝CntEnginecyclesMin×C2
wherein: cntEnginecyclesMinNew-increased minimum number of engine operating cycles;
CntEnginecyclesMin-a minimum number of engine operating cycles;
C2-is a constant of 1.5.
After detecting the rationality fault Error of the fuel injection control system, m is calculated according to the following formulaFuelFinalNew，
mFuelFinalNew＝mFuelFinal×f5(TCoolant,nEng)×f6(pAmbient,nEng)
Wherein: m isFuelFinalNewDetecting the fuel injection quantity after the fuel injection control system rationality fault Error;
mFuelFinaldetecting the fuel injection quantity before the fuel injection control system rationality fault Error;
nEng-the current rotational speed of the engine;
TCoolant-current water temperature of the engine;
pAmbient-the ambient atmospheric pressure at which the engine is located.
Final injected fuel quantity mFuelFinalNewThe fuel injection quantity is only obtained before the fuel injection control closed loop, and the fuel injection quantity is obtained after the fuel injection control closed loop according to the long-term fuel correction and the short-term fuel correction closed loop regulation of the normal closed loop control.
f5(TCoolant,nEng) For values greater than 1, e.g. for engines of certain vehicle types, e.g. table5, f of this vehicle type5(TCoolant,nEng) The correspondence relationship with the engine water temperature and the engine speed is as follows.
Table 5: engine f of a certain vehicle type5(TCoolant,nEng) Comparison table with engine water temperature and engine rotating speed
f6(pAmbient,nEng) A value greater than 1, taking the engine of a certain vehicle type as an example, f of the vehicle type is shown in Table 66(pAmbient,nEng) The correspondence relationship with the ambient atmospheric pressure in which the engine is located and the engine speed is as follows.
Table 6: engine f of a certain vehicle type6(pAmbient,nEng) Comparison table with ambient atmospheric pressure and engine speed of engine
And secondly, when the oil rail pressure sensor and the high-pressure oil pump have any faults, the high-pressure oil pump does not work, and the low-pressure oil pump starts to start oil injection when the actual operation cycle number of the engine is greater than the minimum engine operation cycle number determined based on the current water temperature of the engine.
I.e. satisfying the number of engine operation cycles CntEnginecyclesMinNewGreater than a minimum number of engine operating cycles CntEnginecyclesMinThe low-pressure oil pump can spray oil, and the specific corresponding relation is as follows,
CntEnginecyclesMinNew＝CntEnginecyclesMin×C3
wherein: cntEnginecyclesMinNew-number of engine operating cycles;
CntEnginecyclesMin-a minimum number of engine operating cycles;
C3-a constant of 2.
And before the closed-loop activation of oil injection, the final oil injection quantity mFuelFinalNewThe calculation can be carried out according to the following formula, which is the calculation formula for m in the first case after the detection of an Error in the rationality of the injection control systemFuelFinalNewThe same method is used.
mFuelFinalNew＝mFuelFinal×f5(TCoolant,nEng)×f6(pAmbient,nEng)
Wherein: m isFuelFinalNewDetecting the fuel injection quantity after the fuel injection control system rationality fault Error;
mFuelFinaldetecting the fuel injection quantity before the fuel injection control system rationality fault Error;
nEng-the current rotational speed of the engine;
TCoolant-current water temperature of the engine;
pAmbient-the ambient atmospheric pressure at which the engine is located.
The post-injection quantity is obtained by closed-loop regulation of long-term fuel correction and short-term fuel correction of normal closed-loop control after the closed-loop control of fuel injection (after the exhaust oxygen sensor is activated, the control of fuel injection can be used for correcting the fuel injection quantity according to the actual air-fuel ratio fed back by the oxygen sensor as a feedback signal of fuel injection control).
Thirdly, when any fault occurs in the low-pressure oil pump, oil injection is prohibited, and the engine is prohibited from starting.
In the embodiment, under different water temperatures and different atmospheric pressures of the engine, in order to improve the atomization effect of the fuel oil, the condition of oil injection activation is determined, and oil injection is not allowed when the atomization effect is poor. However, when some faults occur, the engine needs to be started, the engine is not shut down, after a plurality of faults occur, post-processing is carried out, the engine enters a limp-home mode, and the vehicle can be driven to a maintenance shop to be maintained. Finally, the ideal condition that the oil injection system works under the current condition as far as possible is realized.
In the embodiment, when the fault does not occur, high oil pressure oil injection is adopted to improve the atomization effect; if the oil injection pressure condition is not met, the accumulated starting allowed oil injection pressure condition is not met for more than the preset times, then a fault is reported, the oil pressure limit is properly reduced to realize starting, the engine can be ensured to run, and the vehicle can be ensured to run to a maintenance shop for maintenance; after the fault occurs, the engine can enter a limp home mode, the engine can be ensured to run, and the vehicle can be ensured to run to a maintenance shop for maintenance. When the system is normal, oil injection is controlled from the aspects of emission and fuel economy; after the relevant faults occur, the vehicle can be preferentially ensured to limp home for maintenance.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A fuel injection control method for a vehicle equipped with a direct injection engine, characterized in that: when the oil rail pressure sensor, the high-pressure oil pump and the low-pressure oil pump do not have any faults, oil injection is allowed only when the oil injection activation condition is met; the oil injection activation condition comprises an activation condition based on the fuel pressure of an oil rail and an activation condition based on the number of the running periods of the engine, and oil injection is allowed only when the two activation conditions are met simultaneously;
the activation condition based on the fuel rail fuel pressure refers to the condition that the current fuel rail pressure value is larger than the minimum fuel rail fuel pressure determined based on the current water temperature of the engine and the ambient atmospheric pressure of the engine;
the activation condition based on the number of engine operation cycles refers to the condition that the number of actual engine operation cycles is larger than the minimum number of engine operation cycles determined based on the current water temperature of the engine;
the minimum fuel rail fuel pressure calculation method determined based on the current water temperature of the engine and the ambient atmospheric pressure of the engine comprises the following steps: selecting the maximum value of the minimum fuel rail fuel pressure of the fuel injection activation determined based on the current water temperature of the engine and the minimum fuel rail fuel pressure of the fuel injection activation determined based on the atmospheric pressure of the environment where the engine is located as the final minimum fuel rail fuel pressure, wherein the calculation formula is as follows,
pInjectionPermitMin＝Max[f1(TCoolant),f2(pAmbient)] (1)
wherein: p is a radical ofInjectionPermitMin-minimum rail fuel pressure;
TCoolant-current water temperature of the engine;
pAmbient-the ambient atmospheric pressure at which the engine is located.
2. A fuel injection control method of a vehicle equipped with a direct injection engine according to claim 1, characterized in that: the method for calculating the minimum number of the engine operation cycles determined based on the current water temperature of the engine comprises the following steps: the minimum number of engine operation cycles determined based on the current water temperature of the engine is calculated according to the following formula,
CntEnginecyclesMin＝f4(TCoolant) (2)
wherein: cntEnginecyclesMin-a minimum number of engine operating cycles;
TCoolant-current water temperature of the engine.
3. A fuel injection control method of a vehicle equipped with a direct injection engine according to claim 2, characterized in that: the number of the actual running period of the engine refers to the actual running number of the engine, the engine runs for one circle, the number of the actual running period of the engine is accumulated by 1, after the engine is completely stopped, the number of the actual running period of the engine is reset, and the calculation is restarted after the engine is started next time.
4. A fuel injection control method of a vehicle equipped with a direct injection engine according to claim 1, characterized in that: when the fuel injection activation condition based on the fuel rail fuel pressure or the fuel injection activation condition based on the number of the engine operation cycles is not met, fuel injection is not allowed, and the fuel injection non-allowed number Cnt is detected every time the fuel injection is not allowedFuelInjectionInhibitAccumulating for 1; when the fuel injection inadmissible times Cnt are detectedFuelInjectionInhibitWhen N is exceeded, a rationality fault Error of the oil injection control system can be reported; by reducing the minimum rail fuel pressure p when a fuel injection control system rationality fault Error is detectedInjectionPermitMinIncreasing the minimum number of engine operation cycles CntEnginecyclesMinThe fuel injection quantity is measured from m before the occurrence of the fuel injection control system rationality fault ErrorFuelFinalIncreasing to m after detecting fuel injection control system rationality fault ErrorFuelFinalNewThereby starting the engine.
5. A fuel injection control method of a vehicle equipped with a direct injection engine according to claim 4, characterized in that: after detecting the rationality fault Error of the fuel injection control system, m is calculated according to the following formulaFuelFinalNew，
mFuelFinalNew＝mFuelFinal×f5(TCoolant,nEng)×f6(pAmbient,nEng) (3)
Wherein: m isFuelFinalNewDetecting the fuel injection quantity after the fuel injection control system rationality fault Error;
mFuelFinaldetecting the fuel injection quantity before the fuel injection control system rationality fault Error;
nEng-the current rotational speed of the engine;
TCoolant-current water temperature of the engine;
pAmbient-the ambient atmospheric pressure at which the engine is located.
6. A fuel injection control method of a vehicle equipped with a direct injection engine according to claim 1, characterized in that: when any faults occur in the oil rail pressure sensor and the high-pressure oil pump, the high-pressure oil pump does not work, and the low-pressure oil pump starts oil injection when the actual operation cycle number of the engine is larger than the minimum engine operation cycle number determined based on the current water temperature of the engine.
7. A fuel injection control method of a vehicle equipped with a direct injection engine according to claim 1, characterized in that: when any fault occurs in the low-pressure oil pump, oil injection is forbidden, and the engine is forbidden to start.
8. A fuel injection control method of a vehicle equipped with a direct injection engine according to claim 4, characterized in that: the number of times of fuel injection Cnt not allowedFuelInjectionInhibitStoring Error with the rationality fault of the oil injection control system in an EEPORM of the control system, namely after the engine is completely stopped and the control system is completely powered off, the number Cnt of fuel injection unallowable timesFuelInjectionInhibitAnd the fuel injection control system rationality fault Error is not erased.
9. A fuel injection control method of a vehicle equipped with a direct injection engine according to claim 1, characterized in that: the judgment of the activation condition based on the fuel pressure of the fuel rail is only carried out once between the starting and the stopping of the engine, if the activation condition is met once, the judgment is kept in an activation state until the engine is completely stopped, and the judgment of the activation condition is carried out again when the engine is started next time.
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| DE102016215998A1 (en) * | 2016-08-25 | 2018-03-01 | Robert Bosch Gmbh | Method for determining a temperature |
| CN108757197A (en) * | 2018-05-29 | 2018-11-06 | 吉利汽车研究院（宁波）有限公司 | A kind of vehicle cold start method and system |
| CN209179884U (en) * | 2018-12-31 | 2019-07-30 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of high pressure co-rail system inlet metering valve flow control system |
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