CN113357032B - High-pressure oil pump fault detection post-processing method and electronic equipment - Google Patents
High-pressure oil pump fault detection post-processing method and electronic equipment Download PDFInfo
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- CN113357032B CN113357032B CN202110723507.XA CN202110723507A CN113357032B CN 113357032 B CN113357032 B CN 113357032B CN 202110723507 A CN202110723507 A CN 202110723507A CN 113357032 B CN113357032 B CN 113357032B
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/226—Fail safe control for fuel injection pump
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention relates to the field of engine control, in particular to a high-pressure oil pump fault detection post-processing method and electronic equipment. The method comprises the steps of firstly detecting a target oil pressure and an actual oil pressure, comparing the difference between the target oil pressure and the actual oil pressure, judging whether a high-pressure oil pump fails in real time under any working condition, classifying the faults of the high-pressure oil pump according to the difference between the target oil pressure and the actual oil pressure and the frequency of the faults, finely distinguishing the faults of the high-pressure oil pump, enabling the voice reminding content of fault information to be more detailed, enabling a driver to know the fault condition more accurately, and finally comprehensively considering the power, the economy and the emission performance of an engine.
Description
Technical Field
The invention relates to the field of engine control, in particular to a high-pressure oil pump fault detection post-processing method and electronic equipment.
Background
The GDI engine (gasoline direct injection engine) is greatly different from the common PFI engine (air inlet injection engine) in that the working rail pressure (up to 20MPa) required by the GDI engine is much higher than that of the PFI engine, and in order to realize oil injection in the intake stroke and the compression stroke in the cylinder, higher oil injection pressure must be established. The GDI engine realizes the in-cylinder direct injection function of high-pressure gasoline by controlling a high-pressure oil pump.
The high-pressure oil pump mainly comprises an electric control valve at an oil inlet end, a plunger piston for generating high-pressure oil and a one-way valve at an oil outlet end. The working process is that when the plunger piston moves downwards, the fuel oil enters the compression cavity from the low-pressure oil supply pipeline through the electromagnetic valve, and when the electromagnetic valve does not work, the plunger piston moves upwards to press the fuel oil entering the cavity back to the low-pressure pipeline. At the moment, if the control electromagnetic valve is closed, the fuel in the compression cavity is compressed, and high-pressure fuel is output to the high-pressure fuel rail through the one-way valve of the fuel pump outlet pipeline.
The existing fault detection technology for the high-pressure oil pump generally needs the engine to be in a stable working condition for detection, the judgment condition of fault detection is single, only an alarm prompt is given after the fault occurs, and the improvement and protection of the performance of the engine are lacked.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the high-pressure oil pump fault detection post-processing method and the electronic equipment are provided, the high-pressure oil pump fault can be detected in real time without specific working conditions, the fault can be classified in detail, and the fault can be processed in time after the fault occurs, so that an engine is protected, the influence of the fault on the performance of the engine is reduced, and the engine is prevented from stalling.
In order to solve the technical problems, the invention adopts the technical scheme that:
a high-pressure oil pump fault detection post-processing method is characterized by comprising the following steps:
when the cycle times of vehicle driving are updated and the difference between the target oil pressure and the actual oil pressure is out of the range of the preset conditions, a corresponding processing strategy is carried out;
the processing strategy comprises the following steps:
A. when the target oil pressure is higher than the actual oil pressure by a preset condition range, accumulating the high pressure times, and when the accumulated high pressure times exceed a first preset time, reporting a performance fault and improving the target oil pressure; when the accumulated high-pressure times do not exceed the first preset times, the maximum capacity of the high-pressure oil pump is forced, whether the difference between the target oil pressure and the actual oil pressure is reduced or not is judged, if yes, the control capacity of the oil pump is increased, the lowest rotating speed of an engine is limited, and if not, a functional fault of a high-pressure oil pump system is reported;
B. when the target oil pressure is lower than the actual oil pressure by a preset condition range, accumulating the times of low pressure, and when the accumulated times of low pressure exceeds a second preset time, reporting a performance fault and enabling the high-pressure oil pump not to work; and when the accumulated low-pressure times do not exceed the second preset times, controlling the oil pump not to work, judging whether the difference between the target oil pressure and the actual oil pressure is reduced, if so, continuously controlling the oil pump not to work, limiting the highest rotating speed of the engine, and otherwise, reporting the functional fault of the high-pressure oil pump system.
Further, the method for detecting and post-processing the fault of the high-pressure oil pump specifically comprises the following steps:
s1, judging whether the cycle number of the vehicle driving is updated, if yes, executing a step S2, and if not, not detecting the fault of the high-pressure oil pump;
s2, detecting the difference between the target oil pressure and the actual oil pressure, judging whether the difference between the target oil pressure and the actual oil pressure is out of the preset condition range, if so, judging that the high-pressure oil pump system has a fault, and executing the step S3, otherwise, not detecting the fault of the high-pressure oil pump;
s3, classifying the high-pressure oil pump faults, judging the occurrence of a first performance fault type of the high-pressure oil pump system when the target oil pressure is higher than the actual oil pressure by a preset condition range, storing the fault times and powering down for storage, executing the step S4, judging the occurrence of a second performance fault type of the high-pressure oil pump system when the target oil pressure is lower than the actual oil pressure by the preset condition range, storing the fault times and powering down for storage, and executing the step S5;
s4, judging whether the stored failure frequency exceeds the preset frequency N1, if so, reporting the performance failure of the high-pressure oil pump system, and adopting a failure post-processing mode 1, otherwise, executing a step S6;
s5, judging whether the stored failure frequency exceeds the preset frequency N2, if so, reporting the performance failure of the high-pressure oil pump system, and adopting a failure post-processing mode 2, otherwise, executing a step S7;
s6, forcibly controlling the high-pressure oil pump to be pressurized with the maximum capacity, after the pressurization lasts for a preset time T3, judging whether the difference value between the target oil pressure and the actual oil pressure is smaller than the preset oil pressure difference A multiplied by a preset coefficient k1, if so, reporting the weak pressurization capacity fault of the high-pressure oil pump, and adopting a fault post-processing mode 3, otherwise, reporting the functional fault of the high-pressure oil pump system, and adopting a fault post-processing mode 4;
and S7, controlling the high-pressure oil pump not to work, after the preset time T4 lasts, judging whether the absolute value of the difference value between the target oil pressure and the actual oil pressure is smaller than the absolute value of the preset oil pressure difference B and multiplied by a preset coefficient k2, if so, reporting a fault that the supercharging capacity of the high-pressure oil pump is too strong, and adopting a fault post-processing mode 5, otherwise, reporting a fault of a high-pressure oil pump system, and adopting a fault post-processing mode 6.
Further, the specific basis for determining that the difference between the target oil pressure and the actual oil pressure is outside the preset condition range is as follows: the target oil pressure is higher than the actual oil pressure and exceeds the preset oil pressure difference A for a duration exceeding the preset time T1, or the target oil pressure is lower than the actual oil pressure and exceeds the preset oil pressure difference B for a duration exceeding the preset time T2.
Further, the specific basis for determining that the target oil pressure is higher than the actual oil pressure by the preset condition range is as follows: the target oil pressure is higher than the actual oil pressure and exceeds the preset oil pressure difference A, and the duration time exceeds the preset time T1; the specific basis for judging that the target oil pressure is lower than the actual oil pressure by a preset condition range is as follows: the target oil pressure is lower than the actual oil pressure by more than the preset oil pressure difference B, and the duration exceeds the preset time T2.
Further, the preset oil pressure difference A and the preset oil pressure difference B are obtained by multiplying a basic value by a correction coefficient; the basic value is determined based on a target oil pressure and an engine speed; the correction coefficient is jointly determined based on the engine speed and the voltage of the storage battery; after the high-pressure oil pump system is judged to be in fault each time, the absolute values of the preset pressure difference A and the preset pressure difference B are reduced on the basis of the absolute values of the preset pressure difference A and the preset pressure difference B in the previous time.
Further, the preset coefficient k1 is greater than 0 and less than 1, and the preset coefficient k2 is greater than 0 and less than 1.
Further, the fault post-processing method 1 specifically includes: the method comprises the following steps of improving target oil pressure, limiting the lowest engine speed, forbidding a strategy of limiting too low oil pressure and no oil injection in the starting process, closing long-acting fuel correction, reducing the ignition efficiency of the engine in idling and limiting the maximum torque capacity of the engine;
the failure post-processing mode 2 specifically includes: controlling a high-pressure oil pump to stop working, limiting the rotating speed of the engine to be overhigh, correcting and closing long-acting fuel oil, reducing the ignition efficiency of the engine in idling and limiting the maximum torque capacity of the engine;
the failure post-processing mode 3 specifically includes: increasing the target oil pressure while limiting the minimum engine speed;
the failure post-processing mode 4 specifically includes: forbidding a strategy of limiting too low oil pressure and not injecting oil in the starting process, controlling a high-pressure oil pump to stop working, limiting the torque capacity of the engine, improving the idling speed of the engine, closing a carbon tank, closing an exhaust gas recirculation system and closing long-acting fuel correction;
the fault post-processing mode 5 specifically includes: controlling the high-pressure oil pump to stop working and limiting the rotating speed of the engine to be overhigh;
the fault post-processing method 6 specifically includes: and prohibiting a strategy of limiting too low oil pressure and not injecting oil in the starting process, controlling a high-pressure oil pump to stop working, limiting the torque capacity of the engine, improving the idling speed of the engine, closing a carbon tank, closing an exhaust gas recirculation system, and correcting and closing long-acting fuel oil.
Further, the target value for increasing the target oil pressure is determined based on both the original target oil pressure and the difference between the original target oil pressure and the actual oil pressure, and the minimum value for limiting the minimum engine speed is determined based on both the water temperature and the atmospheric pressure.
Further, the fault post-processing modes 1-6 are not continuously executed when the vehicle is restarted after being powered off, and are not triggered again until the corresponding fault occurs again.
An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein: the processor implements the steps of the method as described above when executing the program.
Compared with the prior art, the invention has the following main advantages:
1. by detecting the target oil pressure and the actual oil pressure and comparing the difference value of the target oil pressure and the actual oil pressure, whether the high-pressure oil pump breaks down or not can be judged in real time under any working condition;
2. the faults of the high-pressure oil pump are classified according to the difference value between the target oil pressure and the actual oil pressure and the occurrence frequency of the faults, so that the faults of the high-pressure oil pump can be more finely distinguished, the report content of fault information is more detailed, and a driver can more accurately know the fault condition;
3. the power, the economy and the emission performance of the engine are comprehensively considered, a graded fault post-processing control method is adopted according to different fault types of the high-pressure oil pump, so that the fault post-processing mode is more targeted, and the oil pressure control is further improved by trying when the severity of the fault is lower, so that the performance of the engine is ensured as much as possible, the influence of the fault on the performance of the engine is reduced, and the flameout of the engine is avoided;
4. after each fault occurs, the preset pressure difference absolute value for judging the fault is gradually reduced, so that the fault detection speed is gradually increased, and the fault is judged and processed more timely.
Drawings
FIG. 1 is a logic diagram of a high-pressure oil pump fault detection post-processing method of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to fig. 1 and an embodiment. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
It should be noted that, according to implementation requirements, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can also be combined into a new step/component to achieve the purpose of the present invention.
First embodiment, a method for detecting and post-processing a fault of a high-pressure oil pump according to the present invention is shown in fig. 1, and includes the following steps:
s1, judging whether the cycle number of the vehicle driving is updated, if yes, executing a step S2; if not, the fault of the high-pressure oil pump is not detected.
S2, detecting the difference between the target oil pressure and the actual oil pressure, judging whether the difference between the target oil pressure and the actual oil pressure is larger, if yes, judging that the high-pressure oil pump system has a fault, and executing a step S3; if not, the fault of the high-pressure oil pump is not detected.
The specific basis for judging that the difference between the target oil pressure and the actual oil pressure is large is as follows: the target oil pressure exceeds the actual oil pressure by the preset oil pressure difference a for a duration exceeding the preset time T1 (3 s in this example T1), or the target oil pressure exceeds the actual oil pressure by the preset oil pressure difference B for a duration exceeding the preset time T2 (2 s in this example T2).
S3, classifying the high-pressure oil pump faults, judging the occurrence of the performance fault type of the high-pressure oil pump system when the target oil pressure is judged to be higher than the actual oil pressure, storing the fault times and powering off for storage, and executing the step S4; when it is determined that the target oil pressure is excessively lower than the actual oil pressure, it is determined that the high-pressure oil pump system performance failure type two has occurred, the number of failures thereof is stored and power is turned off for storage, and step S5 is executed.
The specific basis for judging that the target oil pressure is higher than the actual oil pressure and is as follows: the target oil pressure is higher than the actual oil pressure and exceeds the preset oil pressure difference A, and the duration time exceeds the preset time T1 (the T1 of the example is 3 s); the specific basis for judging that the target oil pressure is too large lower than the actual oil pressure is as follows: the target oil pressure is lower than the actual oil pressure by more than the preset oil pressure difference B, and the duration exceeds the preset time T2 (2 s is taken for the present example T2).
In step S2 and step S3, the preset oil pressure differences a and B are each obtained by multiplying a basic value by a correction coefficient, the basic values of a and B are each determined based on the target oil pressure and the engine speed, and the correction coefficients of a and B are each determined based on the engine speed and the battery voltage. The purpose of considering the engine speed and the battery voltage by the preset oil pressure difference is that the engine speed can influence the potential supercharging capacity of the high-pressure oil pump, and the battery voltage can influence the current of the electromagnetic valve of the high-pressure oil pump so as to influence the supercharging capacity of the high-pressure oil pump.
In the present embodiment, when the number of failures is 0, the correspondence table of the basic value of the preset oil pressure difference a with the target oil pressure and the engine speed is as follows:
in the present embodiment, when the number of failures is 0, the correspondence table of the correction coefficient of the preset oil pressure difference a with the engine speed and the battery voltage is as follows:
the correspondence table of the basic value of the preset oil pressure difference B with the target oil pressure and the engine speed when the number of failures is 0 in the present embodiment is as follows:
in the present embodiment, when the number of failures is 0, the correspondence table of the correction coefficient of the preset oil pressure difference B with the engine speed and the battery voltage is as follows:
s4, judging whether the stored failure frequency exceeds the preset frequency N1 (3 in the example), if so, prompting the performance failure of the high-pressure oil pump system by voice, and adopting a failure post-processing mode 1; if not, step S6 is executed.
The fault post-processing mode 1 specifically includes: the method has the advantages that the target oil pressure is improved, the lowest engine speed is limited, the strategy of limiting too low oil pressure and not injecting oil in the starting process is forbidden, long-acting fuel oil is corrected and closed, the ignition efficiency of the engine in idling is reduced (the ignition efficiency is reduced by 0.8 times in the example and is not more than normal), and the maximum torque capacity of the engine is limited (the torque capacity is limited by 0.8 times in the example).
a. The purpose of raising the target oil pressure is: the high-pressure oil pump is controlled to improve the supercharging capacity by increasing the target oil pressure and the actual oil pressure difference;
b. the purpose of limiting the minimum rotational speed is: the performance of the high-pressure oil pump is weaker under the condition of too low rotating speed, oil pressure fluctuation can occur, so that the fuel injection precision is poor, the problem of large shaking and even flameout caused by the fluctuation of the rotating speed is caused, and the rotating speed stability of the engine can be improved by limiting the lowest rotating speed;
c. the purpose of the strategy for prohibiting limiting the oil pressure during starting from being too low to inject oil is: in the starting process, if the oil pressure is too low, the oil nozzle is opened, fuel oil is wet, the atomization effect is poor, the combustion effect is poor, a strategy that the oil pressure is too low and oil is not injected is generally adopted, but after the oil pump fails, the engine is required to be ensured not to be flamed out, and the engine can limp home, so that the function is required to be forbidden;
d. the purpose of the long-term fuel correction shut-off is: at the moment, the combustion stability of the engine is poor, and the long-acting fuel correction is closed because the unstable combustion can interfere the long-acting learning of the fuel;
e. the purpose of reducing the ignition efficiency of the engine at idle is to: the purpose of reducing the ignition efficiency is as follows: the reduction in ignition efficiency is to maintain engine power output, and to improve idle speed stability by increasing air flow.
After the target oil pressure is increased, a new target oil pressure is determined based on the difference between the original target oil pressure and the actual oil pressure and the original target oil pressure, and the specific correspondence table is as follows:
the lowest engine speed is limited, and the lowest engine speed is determined jointly based on the water temperature and the atmospheric pressure, and the specific correspondence table is as follows:
s5, judging whether the stored failure times exceed a preset time N2 (3 in the example), if so, prompting to report the performance failure of the high-pressure oil pump system by voice, and adopting a failure post-processing mode 2; if not, step S7 is executed.
The failure post-processing mode 2 specifically includes: and controlling the high-pressure oil pump to be out of operation, limiting the engine speed to be overhigh (the maximum speed of the example is not more than 4500rpm), closing the long-acting fuel correction, reducing the ignition efficiency of the engine at the idle speed (the ignition efficiency is reduced by the example and is not more than 0.8 times of the normal ignition efficiency), and limiting the maximum torque capacity of the engine (the torque capacity is limited and is not more than 0.8 times of the normal ignition efficiency).
a. The purpose of limiting the maximum rotational speed is: the abnormal operation of the high-pressure oil pump can be caused by the abnormal operation of a power supply system of a traveling computer (ECU), so that the over-high rotating speed of the engine is limited, and the safety of the engine can be protected;
b. the purpose of the long-term fuel correction shut-off is: at the moment, the combustion stability of the engine is poor, and the long-acting fuel correction is closed because the unstable combustion can interfere the long-acting learning of the fuel;
c. the purpose of reducing the ignition efficiency is as follows: the reduction in ignition efficiency is to maintain engine power output, and to improve idle speed stability by increasing air flow.
S6, forcibly controlling the high-pressure oil pump to be pressurized with the maximum capacity, after the preset time T3 (1.5S in the example) continues, judging whether the difference value between the target oil pressure and the actual oil pressure is smaller than the preset oil pressure difference A multiplied by a preset coefficient k1(k1 is smaller than 1 and larger than 0, and 0.85 is taken in the example), if yes, prompting the alarm of the weak fault of the pressurization capacity of the high-pressure oil pump by voice, and adopting a fault post-processing mode 3; if not, the fault of the oil way system of the high-pressure oil pump is represented, the function fault of the high-pressure oil pump system is reported through voice prompt, and a fault post-processing mode 4 is adopted.
The failure post-processing mode 3 specifically includes: the target oil pressure is increased while limiting the minimum engine speed.
a. The purpose of raising the target oil pressure is: the high-pressure oil pump is controlled to improve the supercharging capacity by increasing the target oil pressure and the actual oil pressure difference;
b. the purpose of limiting the minimum rotational speed is: the performance of the high-pressure oil pump is weaker when the rotating speed is too low, oil pressure fluctuation can occur, fuel injection precision is poor, the problem that the rotating speed fluctuates, shaking is large and even flameout is caused is solved, and the stability of the rotating speed of the engine can be improved by limiting the lowest rotating speed.
After the target oil pressure is increased, a new target oil pressure is determined based on the difference between the original target oil pressure and the actual oil pressure and the original target oil pressure, and the specific correspondence table is as follows:
the lowest engine speed is limited, and the lowest engine speed is determined jointly based on the water temperature and the atmospheric pressure, and the specific correspondence table is as follows:
the failure post-processing mode 4 specifically includes: and prohibiting a strategy of limiting too low oil pressure and not injecting oil in the starting process, controlling a high-pressure oil pump to stop working, limiting the torque capacity of the engine, improving the idling speed of the engine, closing a carbon tank, closing an Exhaust Gas Recirculation (EGR) system, and correcting and closing long-acting fuel oil.
At this time, because the combustion stability of the engine is poor, the functions of parts having an influence on the combustion stability are turned off, and because the instability of combustion interferes with the long-term fuel learning, the long-term fuel correction is turned off.
S7, controlling the high-pressure oil pump not to work, after the preset time T4 (1.5S in the example) continues, judging whether the absolute value of the difference value between the target oil pressure and the actual oil pressure is smaller than the absolute value of the preset oil pressure difference B and multiplied by a preset coefficient k2(k2 is smaller than 1 and larger than 0, and 0.9 is taken in the example), if yes, prompting the fault that the supercharging capacity of the high-pressure oil pump is too strong through voice, and adopting a fault post-processing mode 5; if not, the fault of the oil way system of the high-pressure oil pump is represented, the fault of the high-pressure oil pump system is reported through voice prompt, and a fault post-processing mode 6 is adopted.
The fault post-processing mode 5 specifically includes: and controlling the high-pressure oil pump not to work, and limiting the engine speed to be overhigh (the maximum speed of the example does not exceed 4500 rpm).
The purpose of limiting the maximum rotational speed is: the abnormal operation of the high-pressure oil pump can be caused by the abnormal operation of a power supply system of a traveling computer (ECU), so that the over-high rotating speed of the engine is limited, and the safety of the engine can be protected.
The fault post-processing mode 6 specifically includes: and prohibiting a strategy of limiting too low oil pressure and not injecting oil in the starting process, controlling a high-pressure oil pump to stop working, limiting the torque capacity of the engine, improving the idling speed of the engine, closing a carbon tank, closing an Exhaust Gas Recirculation (EGR) system, and correcting and closing long-acting fuel oil.
At this time, because the engine combustion stability is poor, the functions of the parts having an influence on the combustion stability are turned off, and because the combustion instability interferes with the long-term fuel learning, the long-term fuel correction is turned off.
Based on the same inventive concept, an embodiment of the present application further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, all or part of the method steps of the method are implemented.
The second embodiment is basically the same as the first embodiment in principle and technical scheme, and the difference is as follows: after each occurrence of the first or second fault category, the absolute values of the preset differential pressure a and the preset differential pressure B are reduced based on the absolute values of the previous preset differential pressure a and the previous preset differential pressure B, which is set to be reduced by 0.8 times in the present example. The significance of setting the reduction factor is: as the fault occurs again and again, the fault representing the high pressure oil pump system tends to be accurate and the fault persists, and further rapid detection of the fault is required.
The third embodiment is basically the same as the first and second embodiments in principle and technical scheme, and the difference is as follows: the fault post-processing modes 1-6 are not continuously executed when the vehicle is restarted after being powered off, and are not triggered again until the corresponding fault occurs again. It is ensured that the high-pressure oil pump fault detection is only performed when the number of driving cycles of the vehicle is updated, and that the high-pressure oil pump fault detection is performed only once per driving cycle of the vehicle.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A high-pressure oil pump fault detection post-processing method is characterized by comprising the following steps:
when the cycle times of vehicle driving are updated and the difference between the target oil pressure and the actual oil pressure is out of the range of the preset conditions, a corresponding processing strategy is carried out;
the processing strategy comprises the following steps:
A. when the target oil pressure is higher than the actual oil pressure by a preset condition range, accumulating the high pressure times, and when the accumulated high pressure times exceed a first preset time, reporting a performance fault and improving the target oil pressure; when the accumulated high-pressure times do not exceed the first preset times, forcibly controlling the high-pressure oil pump to be pressurized with the maximum capacity, judging whether the difference between the target oil pressure and the actual oil pressure is reduced, if so, increasing the target oil pressure, limiting the lowest rotating speed of the engine, and otherwise, reporting the functional fault of the high-pressure oil pump system;
B. when the target oil pressure is lower than the actual oil pressure by a preset condition range, accumulating the times of low pressure, and when the accumulated times of low pressure exceeds a second preset time, reporting a performance fault and enabling the high-pressure oil pump not to work; and when the accumulated low-pressure times do not exceed the second preset times, controlling the oil pump not to work, judging whether the difference between the target oil pressure and the actual oil pressure is reduced, if so, continuously controlling the oil pump not to work, limiting the highest rotating speed of the engine, and otherwise, reporting the functional fault of the high-pressure oil pump system.
2. The high-pressure oil pump fault detection post-processing method according to claim 1, characterized by comprising the following steps:
s1, judging whether the cycle number of the vehicle driving is updated, if yes, executing a step S2, and if not, not detecting the fault of the high-pressure oil pump;
s2, detecting the difference between the target oil pressure and the actual oil pressure, judging whether the difference between the target oil pressure and the actual oil pressure is out of the preset condition range, if so, judging that the high-pressure oil pump system has a fault, and executing the step S3, otherwise, not detecting the fault of the high-pressure oil pump;
s3, classifying the high-pressure oil pump faults, judging the occurrence of a first performance fault type of the high-pressure oil pump system when the target oil pressure is higher than the actual oil pressure by a preset condition range, storing the fault times and powering down for storage, executing the step S4, judging the occurrence of a second performance fault type of the high-pressure oil pump system when the target oil pressure is lower than the actual oil pressure by the preset condition range, storing the fault times and powering down for storage, and executing the step S5;
s4, judging whether the stored failure frequency exceeds the preset frequency N1, if so, reporting the performance failure of the high-pressure oil pump system, and adopting a failure post-processing mode 1, otherwise, executing a step S6;
s5, judging whether the stored failure frequency exceeds the preset frequency N2, if so, reporting the performance failure of the high-pressure oil pump system, and adopting a failure post-processing mode 2, otherwise, executing a step S7;
s6, forcibly controlling the high-pressure oil pump to be pressurized with the maximum capacity, after the pressurization lasts for a preset time T3, judging whether the difference value between the target oil pressure and the actual oil pressure is smaller than the preset oil pressure difference A multiplied by a preset coefficient k1, if so, reporting the weak pressurization capacity fault of the high-pressure oil pump, and adopting a fault post-processing mode 3, otherwise, reporting the functional fault of the high-pressure oil pump system, and adopting a fault post-processing mode 4;
and S7, controlling the high-pressure oil pump not to work, after the preset time T4 lasts, judging whether the absolute value of the difference value between the target oil pressure and the actual oil pressure is smaller than the absolute value of the preset oil pressure difference B and multiplied by a preset coefficient k2, if so, reporting a fault that the supercharging capacity of the high-pressure oil pump is too strong, and adopting a fault post-processing mode 5, otherwise, reporting a fault of a high-pressure oil pump system, and adopting a fault post-processing mode 6.
3. The high-pressure oil pump failure detection post-processing method according to claim 1 or 2, characterized in that: the specific basis for judging that the difference between the target oil pressure and the actual oil pressure is outside the preset condition range is as follows: the target oil pressure is higher than the actual oil pressure by exceeding the preset oil pressure difference A and the duration exceeds the preset time T1, or the target oil pressure is lower than the actual oil pressure by exceeding the preset oil pressure difference B and the duration exceeds the preset time T2.
4. The high-pressure oil pump failure detection post-processing method according to claim 1 or 2, characterized in that: the specific basis for judging that the target oil pressure is higher than the actual oil pressure by a preset condition range is as follows: the target oil pressure is higher than the actual oil pressure and exceeds the preset oil pressure difference A, and the duration time exceeds the preset time T1; the specific basis for judging that the target oil pressure is lower than the actual oil pressure by a preset condition range is as follows: the target oil pressure is lower than the actual oil pressure by more than the preset oil pressure difference B, and the duration exceeds the preset time T2.
5. The high-pressure oil pump failure detection post-processing method according to claim 4, characterized in that: the preset oil pressure difference A and B are obtained by multiplying a basic value by a correction coefficient; the basic value is determined based on a target oil pressure and an engine speed; the correction coefficient is jointly determined based on the engine speed and the storage battery voltage; after the high-pressure oil pump system is judged to be in fault each time, the absolute values of the preset pressure difference A and the preset pressure difference B are reduced on the basis of the absolute values of the preset pressure difference A and the preset pressure difference B in the previous time.
6. The high-pressure oil pump failure detection post-processing method according to claim 2, characterized in that: the preset coefficient k1 is greater than 0 and less than 1, and the preset coefficient k2 is greater than 0 and less than 1.
7. The high-pressure oil pump failure detection post-processing method according to claim 2, characterized in that:
the fault post-processing mode 1 specifically includes: the method comprises the following steps of improving target oil pressure, limiting the lowest engine speed, forbidding a strategy of limiting too low oil pressure and no oil injection in the starting process, closing long-acting fuel correction, reducing the ignition efficiency of the engine in idling and limiting the maximum torque capacity of the engine;
the failure post-processing mode 2 specifically includes: controlling a high-pressure oil pump to stop working, limiting the over-high rotating speed of the engine, correcting and closing the long-acting fuel oil, reducing the ignition efficiency of the engine in idling and limiting the maximum torque capacity of the engine;
the failure post-processing mode 3 specifically includes: increasing the target oil pressure while limiting the minimum engine speed;
the failure post-processing mode 4 specifically includes: forbidding a strategy of limiting too low oil pressure and not injecting oil in the starting process, controlling a high-pressure oil pump to stop working, limiting the torque capacity of the engine, improving the idling speed of the engine, closing a carbon tank, closing an exhaust gas recirculation system and closing long-acting fuel correction;
the fault post-processing mode 5 specifically includes: controlling the high-pressure oil pump not to work and limiting the over-high rotating speed of the engine;
the fault post-processing method 6 specifically includes: and prohibiting a strategy of limiting too low oil pressure and not injecting oil in the starting process, controlling a high-pressure oil pump to stop working, limiting the torque capacity of the engine, improving the idling speed of the engine, closing a carbon tank, closing an exhaust gas recirculation system, and correcting and closing long-acting fuel oil.
8. The high-pressure oil pump failure detection post-processing method according to claim 7, characterized in that: the target value for increasing the target oil pressure is determined based on the difference between the original target oil pressure and the actual oil pressure and the original target oil pressure, and the minimum value for limiting the minimum engine speed is determined based on the water temperature and the atmospheric pressure.
9. The high-pressure oil pump failure detection post-processing method according to claim 7, characterized in that: the fault post-processing modes 1-6 are not continuously executed when the vehicle is restarted after being powered off, and are not triggered again until the corresponding fault occurs again.
10. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein: the processor, when executing the program, performs the steps of the method according to any of claims 1 to 9.
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| CN115030830A (en) * | 2022-06-20 | 2022-09-09 | 中国第一汽车股份有限公司 | Fault diagnosis method for variable-pressure low-pressure fuel pump |
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| JP4372466B2 (en) * | 2003-06-19 | 2009-11-25 | 株式会社デンソー | Abnormality diagnosis device for high pressure fuel supply system of internal combustion engine |
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