CN115075972B - Method for monitoring working performance of electronic pressure relief valve for engine air intake - Google Patents

Method for monitoring working performance of electronic pressure relief valve for engine air intake Download PDF

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Publication number
CN115075972B
CN115075972B CN202210756111.XA CN202210756111A CN115075972B CN 115075972 B CN115075972 B CN 115075972B CN 202210756111 A CN202210756111 A CN 202210756111A CN 115075972 B CN115075972 B CN 115075972B
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pressure
relief valve
boost
intake
engine
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CN115075972A (en
Inventor
张春娇
秦龙
雷雪
杨柳春
鲁盼
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Dongfeng Motor Group Co Ltd
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Dongfeng Motor Group Co Ltd
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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
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10157—Supercharged engines
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10255—Arrangements of valves; Multi-way valves
    • 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
    • F02D2200/04—Engine intake system parameters
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • 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
    • Y02T10/12—Improving ICE efficiencies
    • 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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  • 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)
  • Supercharger (AREA)

Abstract

The application discloses a method for monitoring the working performance of an electronic pressure relief valve for engine air intake, which monitors the working performance of the electronic pressure relief valve when the pressure relief valve is required to be closed, and comprises the following steps: step one, judging whether the condition of failure monitoring of the pressure relief valve is met or not; and step two, if the condition of the step one is met, starting monitoring, and if the condition of the step one is not met, not starting monitoring. According to the application, the performance of the pressure relief valve can be monitored under a more comprehensive working condition, the faults of the pressure relief valve can be reported as soon as possible, a driver is reminded to maintain the pressure relief valve, and the safety and the performance of the vehicle are ensured.

Description

Method for monitoring working performance of electronic pressure relief valve for engine air intake
Technical Field
The application relates to a pressure relief valve monitoring method, in particular to a method for monitoring the working performance of an electronic pressure relief valve for engine air intake, and belongs to the technical field of engine control.
Background
When the torque of the supercharged engine is reduced, such as a throttle valve or an engine stop, in order to respond to the torque reduction request, a throttle valve can be quickly closed, the air inflow is reduced, and the effect of reducing the torque is achieved. The throttle valve is closed rapidly, the pressure relief valve is opened, when gas flows through the pressure relief valve, if the pressure relief valve is not opened normally, the gas flow oscillates back and forth at the middle pipeline part of the front end of the throttle valve and the rear end of the compressor, and surging occurs. In contrast, when the driver steps on the accelerator or the engine has a supercharging request, the pressure relief valve is required to be closed, and airflow is not allowed to flow through the pressure relief valve, so that the supercharging request can be responded normally and quickly, and power output is realized.
The Chinese patent publication No. CN109779742A discloses a failure monitoring system and method for an electronic pressure relief valve of an engine, wherein a failure monitoring method is provided when the pressure relief valve is required to be opened, but a pressure relief valve actuator is not accurately opened. But it does not take into account the performance monitoring method in case the relief valve is abnormally opened if it is not requested to be opened.
Disclosure of Invention
The application aims to provide a method for monitoring the working performance of a pressure relief valve when the pressure relief valve is not required to be opened.
In order to better explain the present application, a brief description will be given of a control system to which the present application is applied.
The control system comprises an engine controller EMS, a boost pressure sensor arranged behind an engine air inlet compressor, an atmospheric pressure sensor, an air inlet pressure sensor behind a throttle valve and an electronic pressure relief valve body.
The boost pressure sensor is used for reading the gas pressure at the outlet of the compressor;
the atmospheric pressure sensor is used for reading the pressure of the gas in the atmosphere;
the intake pressure sensor is used for reading the gas pressure after the throttle valve;
the pressure relief valve body is used for enabling air flow to flow from the pressure relief valve to the front end of the compressor when the intake pressure is reduced, so that surge caused by back and forth oscillation of the air flow in the compressor is prevented;
the engine controller EMS controls the opening and closing of the electronic pressure relief valve by applying a certain control algorithm according to the current working condition, monitors when the pressure relief valve fails, reports a fault code and reminds a driver. The electronic pressure release valve opening/closing control can be realized according to a patent with publication number CN111219244a, entitled control method for a pressure release valve of a turbocharged engine.
The application is realized in particular as follows:
the method for monitoring the working performance of the electronic air intake pressure relief valve of the engine is to monitor the working performance of the electronic air intake pressure relief valve when the pressure relief valve is required to be closed, and comprises the following steps:
step one, judging whether the condition of failure monitoring of the pressure relief valve is met or not;
and step two, if the condition of the step one is met, starting monitoring, and if the condition of the step one is not met, not starting monitoring.
The further scheme is as follows:
the condition of meeting the first step means that all the following conditions are met at the same time, including:
1) The atmospheric pressure sensor diagnoses no fault;
2) The throttle valve outlet gas pressure sensor diagnoses no fault;
3) The boost pressure sensor diagnoses no fault;
4) The boost control actuator wastegate valve diagnosing no fault;
5) The electromagnetic valve of the electronic pressure relief valve has no circuit fault;
6) The engine is in an operating state, rather than a shutdown and startup process state;
7) The electronic pressure release valve requests to close the flag bit for enabling (specific enabling conditions can be seen in patent CN202010109543.2, method for controlling pressure release valve of turbocharged engine);
8) The throttle opening degree decrease rate of change is smaller than a preset value a, which depends on the engine speed and the throttle outlet gas pressure. The larger the intake pressure is, the smaller the throttle opening degree decrease rate is, and the collision with condition 6) due to the surge of the supercharger or the opening of the relief valve caused by the rapid closing of the throttle valve is avoided.
The further scheme is as follows:
the calibration basis of the preset value A is that the throttle opening reduces the maximum value of the change rate on the premise of not affecting the surge of the supercharger.
The further scheme is as follows:
in the second step, when monitoring is started, the following three conditions are judged:
1) The boost closed loop control is not activated;
2) The engine speed is stable;
3) The change rate of the engine air inflow exceeds a preset value
When the above three conditions are met simultaneously and exceed the preset time T0, judging whether the rising variation of the boost pressure is smaller than the preset value p1 or not every revolution of the engine, once the rising variation of the boost pressure is smaller than the preset value, indicating that the boost pressure has leakage, accumulating 1 by a leakage fault counter, and continuously judging the number of Cnt 1. If the rising variable quantity of the Cnt11 times of the boost pressure is smaller than the preset value p1 within the Cnt1 times, the pressure relief valve fails.
Once any of the above three conditions is not met, the leakage fault counter is cleared.
Once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
The further scheme is as follows:
engine speed stabilization refers to engine speed fluctuations within 20 rpm.
The sampling frequency of the engine intake air amount change rate is one sampling per engine revolution.
The further scheme is as follows:
in the second step, when monitoring is started, the following three conditions are judged:
1) The boost closed loop control is not activated;
2) The engine speed is stable;
3) The change rate of the air inflow of the engine does not exceed a preset value
When the above three conditions are met simultaneously and exceed the preset time T1, judging whether the variation of the pressure drop of the supercharging pressure is larger than the preset value p2 or not every revolution of the engine, and once the variation is smaller than the preset value, indicating that the supercharging pressure has leakage, accumulating 1 by a leakage fault counter, continuously judging the times of Cnt2, wherein the Cnt2 is higher than Cnt 1. If the variation of the Cnt 21-time supercharging pressure drop is larger than the preset value p2 within the Cnt2 times, the pressure drop is quicker, and the pressure relief valve fails.
Once any of the above three conditions is not met, the leakage fault counter is cleared.
Once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
The further scheme is as follows:
engine speed stabilization refers to engine speed fluctuations within 20rpm;
the sampling frequency of the engine intake air amount change rate is one sampling per engine revolution.
The further scheme is as follows:
in the second step, when monitoring is started, the following four conditions are judged:
1) The boost pressure is activated in a closed-loop control manner;
2) The target intake air pressure (target intake air pressure means target gas pressure of the intake cylinder) is not reduced, that is, the target intake air pressure change rate is greater than or equal to 0kPa/s;
3) The target intake air pressure is close to the actual intake air pressure (read by the intake air pressure sensor);
4) The boost control actuator wastegate valve has its maximum boost capacity, i.e., the supercharger is not likely to provide more boost pressure at this time;
when the above four conditions are satisfied simultaneously for more than the preset time T2, the absolute value of the difference between the calculated boost pressure (read by the boost pressure sensor) and the actual intake pressure per revolution of the engine is divided by the throttle outlet pressure to obtain a ratio, and the ratio of Cnt3 times is continuously accumulated. If the ratio exceeds the preset value C1, the pressure relief valve fails.
Once any of the above four conditions is not met, the Cnt3 count counter is cleared.
Once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
The further scheme is as follows:
the target intake pressure is close to the actual intake pressure, meaning that the difference between the two pressure values is within ±0.1 kPa.
The further scheme is as follows:
in the second step, when monitoring is started, the following three conditions are judged:
1) The boost closed-loop control is activated;
2) The target intake air pressure is not decreased, i.e., the target intake air pressure change rate is greater than or equal to 0kPa/s;
3) The boost control actuator wastegate valve does not reach its maximum boost capacity
When the above three conditions are satisfied simultaneously, the ratio of the boost pressure to the target intake pressure r pRaw Filtering to obtain filtered r p ：
Wherein r is pRaw R is the ratio of boost pressure to target intake pressure pRaw (N) is the ratio of the boost pressure to the target intake pressure for the nth sampling period, r p (N) is the ratio of the filtered boost pressure to the target intake pressure for the nth sampling period, r p (N-1) is the ratio of the filtered boost pressure to the target intake pressure for the N-1 th sampling period, n=1, 2,3 …, r p (N-1) ratio r of boost pressure at the 0 th sampling period (when the engine speed is changed from 0 to non-0, i.e., when the engine starts to start) to the target intake pressure pRaw (N); the sampling period interval Δt depends on the engine speed and the charge density. K is the coefficient:wherein m is the number of engine cylinders, n is the engine speed, and k is a filter coefficient;
subtracting 1 from the ratio of the filtered boost pressure to the target intake pressure r p Obtaining 1- r p After the timer for starting the timing is exceeded by the above conditions, if 1- r p If the pressure relief valve is larger than the preset value C2, the pressure relief valve has leakage, and the pressure relief valve fails.
Once any of the above three conditions is not met, the timer is cleared.
Once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
The further scheme is as follows:
before the step, if the mileage of the vehicle exceeds the preset mileage S, the following conditions are met, and the relief valve is actively controlled to check whether the relief valve is normal or not:
1) The engine speed exceeds 4500rpm, and the fluctuation range is +/-20 rpm;
2) The density of the inlet air exceeds 1600mgpl, and the fluctuation range is +/-15 mgpl;
3) The boost pressure is greater than the intake pressure, indicating that the throttle opening may be further increased to increase the intake pressure;
4) The temperature fluctuation range of the intake manifold is within +/-2.5 ℃;
5) The boost closed-loop control is activated;
6) The vehicle did not experience a pressure relief valve performance failure.
After the conditions meet the preset time T4 at the same time, the supercharging control is ensured to ensure that the supercharging pressure is close to the air inlet pressure when the pressure relief valve works normally, the opening time of the pressure relief valve is controlled to be 0.01s through a fixed period, the closing time is controlled to be 0.01s after the opening time of the pressure relief valve is controlled to be 0.01s, and after a period of time T5, if the sum of absolute values of differences between the supercharging pressure and the air inlet pressure is detected to exceed the preset value, the fact that the supercharging pressure fluctuation is large is indicated, and the pressure relief valve works normally. The following calibration values need to be updated at this time:
1) The preset value p1 in the first case is updated to p 1kp 1 stored in the previous driving cycle;
2) Updating the preset value p2 in the second case to p2 kp2 stored in the previous driving cycle;
3) The preset value C1 in the third case is updated to C1 kc1 stored in the previous driving cycle;
4) Updating the preset value C2 in the fourth case to C2 kc2 stored in the previous driving cycle;
the further scheme is as follows:
the active opening and closing control and the monitoring updating of the pressure release valve are only updated once after the vehicle driving exceeds the preset mileage S, and the accumulated mileage is restarted after the updating is completed until the accumulated mileage reaches the preset mileage.
The application has the following outstanding beneficial effects:
according to the application, the performance of the pressure relief valve can be monitored under a more comprehensive working condition, the faults of the pressure relief valve can be reported as soon as possible, a driver is reminded to maintain the pressure relief valve, and the safety and the performance of the vehicle are ensured.
Detailed Description
The present application will be described in further detail with reference to specific examples.
The method for monitoring the working performance of the electronic air intake pressure relief valve of the engine is to monitor the working performance of the electronic air intake pressure relief valve when the pressure relief valve is required to be closed, and comprises the following steps:
step one, judging whether the condition of failure monitoring of the pressure relief valve is met or not;
and step two, if the condition of the step one is met, starting monitoring, and if the condition of the step one is not met, not starting monitoring.
The condition of meeting the first step means that all the following conditions are met at the same time, including:
1) The atmospheric pressure sensor diagnoses no fault;
2) The throttle outlet gas pressure (intake pressure) sensor diagnoses no fault occurrence;
3) The boost pressure sensor diagnoses no fault;
4) The boost control actuator wastegate valve diagnosing no fault;
5) The electromagnetic valve of the electronic pressure relief valve has no circuit fault;
6) The engine is in an operating state, rather than a shutdown and startup process state;
7) The electronic pressure release valve requests to close the flag bit to enable; (electronic pressure relief valve closing control may be implemented according to a patent publication number CN111219244a entitled control method for a pressure relief valve for a turbocharged engine);
8) The rate of change of the decrease in throttle opening (closing the throttle, which would decrease) is smaller than the preset value a, which depends on the engine speed and the throttle outlet gas pressure. The larger the intake pressure is, the smaller the rate of change of the throttle opening decrease is, and the condition 6 is avoided that the throttle valve is closed quickly to cause the surge of the supercharger or the decompression valve is opened to collide with the condition 6. The calibration parameters of the preset value A are as follows, and the calibration basis is that the opening of the throttle valve is reduced to the maximum value of the change rate on the premise of not affecting the surge of the supercharger.
After all working conditions are met, failure monitoring of the pressure relief valve can be performed, and once any one of the conditions is not met, performance monitoring is stopped to avoid misjudgment of the performance monitoring.
After all the above conditions are satisfied, there are:
in the first case of the first type of case,
1) Boost closed-loop control (specifically, closed-loop control of boost pressure) is not activated (boost pressure closed-loop control is not activated means closed-loop control of boost pressure is not opened);
2) The engine speed is stable (the engine speed fluctuation is within 20rpm at this time);
3) The rate of change of the intake air amount of the engine exceeds a preset value (5 mgpl/s is taken in this embodiment, and the engine is sampled once per revolution)
After the above three conditions are satisfied simultaneously and exceeding the preset time T0 (3 s is taken in this embodiment), it is determined whether the variation of the boost pressure rise is smaller than the preset value p1 or not every revolution of the engine, and once the variation is smaller than the preset value, it is indicated that the boost pressure has a leakage condition, the leakage fault counter is incremented by 1, and the number of Cnt1 is continuously determined (10 is taken in this embodiment). If Cnt11 times (5 in this embodiment) of the rising variation of the boost pressure is smaller than the preset value p1 within Cnt1 times, the relief valve fails. Once any of the above three conditions is not met, the leakage fault counter is cleared. Once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more. The preset value p1 depends on the engine speed and the intake pressure variation amount.
In the second case of the two-way valve,
1) The boost closed loop control is not activated;
2) The engine speed is stable (the engine speed fluctuation is within 20rpm at this time);
3) The change rate of the air inflow of the engine does not exceed a preset value (the embodiment takes-4 mgpl/s, and the engine is sampled once per revolution)
After the above three conditions are satisfied simultaneously for more than the preset time T1, (5 s is taken in this embodiment), it is determined whether the variation of the boost pressure drop is greater than the preset value p2 or not every revolution of the engine, and once it is smaller than the preset value, it is described that the boost pressure has a leakage condition, the leakage fault counter is incremented by 1, the number of times Cnt2 is continuously determined, and Cnt2 is higher than Cnt1 (15 is taken in this embodiment, the reason that Cnt2 is higher than Cnt1 is that the intake air amount is reduced by partially closing the throttle valve, the boost pressure has a small variation, and the accuracy is ensured by delaying the monitoring number of times in order to avoid misdiagnosis). If the variation of the pressure drop of Cnt21 times (12 is taken in this embodiment) within Cnt2 times is larger than the preset value p2, the pressure drop is faster, and the relief valve fails. Once any of the above three conditions is not met, the leakage fault counter is cleared. Once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more. The preset value p2 depends on the engine speed and the intake pressure variation amount.
In a third case of the method, the third case,
1) The boost closed-loop control is activated;
2) The target intake air pressure is not decreased, i.e., the target intake air pressure change rate is greater than or equal to 0kPa/s;
3) The target intake air pressure is close to the actual intake air pressure, and the present embodiment is within ±0.1kPa
4) The boost control actuator wastegate valve has its maximum boost capacity (where the exhaust gas is fully used to boost the boost by pushing the turbine)
After the above four conditions are simultaneously met and the preset time T2 is exceeded, (5 s is taken in this embodiment), the absolute value of the difference between the calculated boost pressure and the actual intake pressure of the engine per revolution is divided by the throttle outlet pressure to obtain a ratio, and the ratio of Cnt3 times (12 is taken in this embodiment) is continuously accumulated. If the ratio exceeds a preset value C1 (5 in this embodiment), the relief valve fails. Once any of the above four conditions is not met, the Cnt3 count counter is cleared. Once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
In the fourth case of the method, the fourth case,
1) The boost closed-loop control is activated;
2) The target intake air pressure is not decreased, i.e., the target intake air pressure change rate is greater than or equal to 0kPa/s;
3) The boost control actuator wastegate valve does not reach its maximum boost capacity (where the exhaust gas is fully used to boost the turbine)
After the above conditions are satisfied, the ratio r of boost pressure to target intake pressure pRaw Filtering to obtain filtered r p ：
Wherein r is pRaw R is the ratio of boost pressure to target intake pressure pRaw (N) is the ratio of the boost pressure to the target intake pressure for the nth sampling period, r p (N) is the ratio of the filtered boost pressure to the target intake pressure for the nth sampling period, r p (N-1) is the ratio of the filtered boost pressure to the target intake pressure for the N-1 th sampling period, n=1, 2,3 …, r p (N-1) ratio r of boost pressure at the 0 th sampling period (when the engine speed is changed from 0 to non-0, i.e., when the engine starts to start) to the target intake pressure pRaw (N); the sampling period interval Δt depends on the engine speed and the charge density. K is the coefficient:(the number of cylinders of the engine of this example is 4, the nominal rotational speed of k is 1000rpm, +.>The purpose of this arrangement is to normalize, and under different cylinder numbers and rotational speeds, only 4 cylinder machines and k with rotational speed of 1000rpm need to be calibrated, thereby reducing calibration test work of different engine types), wherein m is the number of engine cylinders, n is the rotational speed of the engine, k is a filter coefficient, and this embodiment takes 0.56. The sampling period interval Δt depends on the engine speed and the charge density, mainly the system reaction time for realizing the boost pressure increase by the boost control at different engine speeds and charge densities.
Subtracting 1 from the ratio r of the filtered boost pressure to the target intake pressure p Obtaining 1-r p After the timer for starting counting is exceeded by the above conditions while satisfying the above conditions for a preset time T3 (8 s is taken in the present embodiment), if 1-r p When the pressure is greater than the preset value C2 (0.2 is taken in the embodiment), the pressure release valve has leakage, and the pressure release valve fails. Once any of the above three conditions is not met, the timer is cleared. Once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
In particular, if the vehicle mileage exceeds a preset mileage S (5 km in this embodiment), the relief valve is checked for normal by actively controlling the relief valve command when the following conditions are satisfied:
1) The engine speed exceeds 4500rpm, and the fluctuation range is +/-20 rpm;
2) The density of the inlet air exceeds 1600mgpl, and the fluctuation range is +/-15 mgpl;
3) The boost pressure is greater than the intake pressure, indicating that the throttle opening may be further increased to increase the intake pressure;
4) The temperature fluctuation range of the intake manifold is within +/-2.5 ℃;
5) The boost closed-loop control is activated;
6) The vehicle did not experience a pressure relief valve performance failure.
After the above conditions are satisfied for a preset time T4 (4 s is taken in this embodiment), it is ensured that the boost control is performed to ensure that the boost pressure is close to the intake pressure if the operation of the relief valve is normal (the calibration value is updated after the update is terminated once any of the above conditions is not satisfied), the open duration of the relief valve is controlled for 0.01s by a fixed period, the close duration is 0.01s, and after a period of time T5 (1 s is taken in this embodiment), if the sum of the absolute value of the difference between the boost pressure and the intake pressure (the sampling period is one revolution of the engine) is detected to exceed the preset value, this embodiment takes 8kPa, which indicates that the boost pressure fluctuation is large and the relief valve is operated normally. The following calibration values need to be updated at this time:
the preset value p1 in the first case is updated to p1 x kp1 stored in the previous driving cycle, where kp1 in this embodiment is 0.91;
the preset value p2 in the second case is updated to p2 x kp2 stored in the previous driving cycle, where kp1 in this embodiment is 0.95;
the preset value C1 in the third case is updated to C1 kc1 stored in the previous driving cycle, where kc1 in this embodiment is 0.85;
the preset value C2 in the fourth case is updated to C2 kc2 stored in the previous driving cycle, where kc2 in this embodiment is 0.92;
the above control of actively opening and closing the pressure release valve and the monitoring update are updated only once after the vehicle driving exceeds the preset mileage S (5 km is taken in this embodiment), and the accumulated mileage is restarted after the update is completed, and the operation is performed again until the accumulated mileage reaches the preset mileage. The vehicle mileage, the number of times of pressure relief valve faults and preset values under various conditions are stored after the vehicle is powered down.
Although the application has been described herein with reference to the above-described illustrative embodiments thereof, the foregoing embodiments are merely preferred embodiments of the present application, and it should be understood that the embodiments of the present application are not limited to the above-described embodiments, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure.

Claims (12)

1. A method for monitoring the working performance of an electronic pressure relief valve for engine air intake is characterized by comprising the following steps: the working performance of the pressure release valve is monitored when the pressure release valve is required to be closed, and the method comprises the following steps of:
step one, judging whether the condition of failure monitoring of the pressure relief valve is met or not;
step two, if the condition of the step one is met, starting monitoring, and if the condition of the step one is not met, not starting monitoring;
the condition of meeting the first step means that all the following conditions are met at the same time, including:
1) The atmospheric pressure sensor diagnoses no fault;
2) The throttle valve outlet gas pressure sensor diagnoses no fault;
3) The boost pressure sensor diagnoses no fault;
4) The boost control actuator wastegate valve diagnosing no fault;
5) The electromagnetic valve of the electronic pressure relief valve has no circuit fault;
6) The engine is in an operating state, rather than a shutdown and startup process state;
7) The electronic pressure release valve requests to close the flag bit to enable;
8) The throttle opening degree decrease rate of change is smaller than a preset value a, which depends on the engine speed and the throttle outlet gas pressure; the larger the intake pressure is, the smaller the throttle opening degree decrease rate is, and the collision with condition 6) due to the surge of the supercharger or the opening of the relief valve caused by the rapid closing of the throttle valve is avoided.
2. The method for monitoring the working performance of the electronic pressure relief valve for air intake of the engine according to claim 1, wherein the method comprises the following steps:
the calibration basis of the preset value A is that the throttle opening reduces the maximum value of the change rate on the premise of not affecting the surge of the supercharger.
3. The method for monitoring the working performance of the electronic pressure relief valve for air intake of the engine according to claim 1, wherein the method comprises the following steps:
in the second step, when monitoring is started, the following three conditions are judged:
1) The boost closed loop control is not activated;
2) The engine speed is stable;
3) The change rate of the engine air inflow exceeds a preset value
When the three conditions are met simultaneously and exceed the preset time T0, judging whether the rising variation of the boost pressure is smaller than a preset value p1 or not every turn of the engine, once the rising variation of the boost pressure is smaller than the preset value, indicating that the boost pressure has leakage, accumulating 1 by a leakage fault counter, and continuously judging Cnt1 times; if Cnt11 times of boost pressure rising variation is smaller than a preset value p1 within Cnt1 times, the pressure relief valve fails;
once any one of the three conditions is not met, the leakage fault counter is cleared;
once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
4. The method for monitoring the working performance of the electronic pressure relief valve for air intake of the engine according to claim 1, wherein the method comprises the following steps:
in the second step, when monitoring is started, the following three conditions are judged:
1) The boost closed loop control is not activated;
2) The engine speed is stable;
3) The change rate of the air inflow of the engine does not exceed a preset value
When the three conditions are met simultaneously and exceed the preset time T1, judging whether the variation of the reduction of the boost pressure is larger than a preset value p2 or not every revolution of the engine, and once the variation is larger than the preset value, indicating that the boost pressure has leakage, accumulating 1 by a leakage fault counter, continuously judging the times of Cnt2, wherein the Cnt2 is higher than Cnt 1; if the variation of the Cnt 21-time supercharging pressure drop occurs in the Cnt2 times and is larger than the preset value p2, the pressure drop is quicker, and the pressure release valve fails;
once any one of the three conditions is not met, the leakage fault counter is cleared;
once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
5. The method for monitoring the working performance of the electronic pressure relief valve for engine intake according to claim 3 or 4, characterized by comprising the steps of:
engine speed stabilization refers to engine speed fluctuations within 20rpm;
the sampling frequency of the engine intake air amount change rate is one sampling per engine revolution.
6. The method for monitoring the working performance of the electronic pressure relief valve for air intake of the engine according to claim 1, wherein the method comprises the following steps:
in the second step, when monitoring is started, the following four conditions are judged:
1) The boost closed-loop control is activated;
2) The target intake air pressure is not decreased, i.e., the target intake air pressure change rate is greater than or equal to 0kPa/s;
3) The target intake air pressure is close to the actual intake air pressure;
4) The boost control actuator wastegate valve reaches its maximum boost capacity;
when the four conditions are met simultaneously and exceed the preset time T2, calculating the absolute value of the difference between the supercharging pressure and the actual air inlet pressure and dividing the absolute value by the outlet pressure of the throttle valve every turn of the engine to obtain a ratio, and continuously accumulating the ratio of Cnt3 times; if the ratio exceeds a preset value C1, the pressure relief valve fails;
once any one of the four conditions is not met, resetting a Cnt3 number counter;
once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
7. The method for monitoring the working performance of the electronic pressure relief valve for engine intake according to claim 6, wherein the method comprises the following steps:
the target intake pressure is close to the actual intake pressure, meaning that the difference between the two pressure values is within ±0.1 kPa.
8. The method for monitoring the working performance of the electronic pressure relief valve for air intake of the engine according to claim 1, wherein the method comprises the following steps:
in the second step, when monitoring is started, the following three conditions are judged:
1) The boost closed-loop control is activated;
2) The target intake air pressure is not decreased, i.e., the target intake air pressure change rate is greater than or equal to 0kPa/s;
3) The boost control actuator wastegate valve does not reach its maximum boost capacity
When the above three conditions are satisfied simultaneously, the ratio r of the boost pressure to the target intake pressure pRaw Filtering to obtain filtered r p ：
Wherein r is pRaw R is the ratio of boost pressure to target intake pressure pRaw (N) is the ratio of the boost pressure to the target intake pressure for the nth sampling period, r p (N) is the ratio of the filtered boost pressure to the target intake pressure for the nth sampling period, r p (N-1) is the ratio of the filtered boost pressure to the target intake pressure for the N-1 th sampling period, n=1, 2,3 …, r p (N-1) is equal to the ratio r of the boost pressure at the 0 th sampling period to the target intake air pressure pRaw (N); the sampling period interval Δt depends on the engine speed and the charge density; k is the coefficient:wherein m is the number of engine cylinders, n is the engine speed, and k is a filter coefficient; the 0 th sampling period is when the engine speed changes from 0 to non-0, namely when the engine starts to start;
subtracting 1 from the ratio r of the filtered boost pressure to the target intake pressure p Obtaining 1-r p After the timer for starting to count is exceeded by the above conditions and the above conditions are satisfied, if 1-r p If the pressure is larger than the preset value C2, the pressure release valve has leakage, and the pressure release valve fails;
once any one of the three conditions is not met, the timer is cleared;
once the pressure release valve is monitored to be faulty, the driving cycle of the vehicle is not monitored any more.
9. The method for monitoring the working performance of the electronic pressure relief valve for engine intake according to claim 3, wherein the method comprises the following steps:
before the step, if the mileage of the vehicle exceeds the preset mileage S, the following conditions are met, and the relief valve is actively controlled to check whether the relief valve is normal or not:
1) The engine speed exceeds 4500rpm, and the fluctuation range is +/-20 rpm;
2) The density of the inlet air exceeds 1600mgpl, and the fluctuation range is +/-15 mgpl;
3) The boost pressure is greater than the intake pressure, indicating that the throttle opening may be further increased to increase the intake pressure;
4) The temperature fluctuation range of the intake manifold is within +/-2.5 ℃;
5) The boost closed-loop control is activated;
6) The performance failure of the pressure release valve of the vehicle does not occur;
after the conditions meet the preset time T4 at the same time, the supercharging control is ensured to ensure that the supercharging pressure is close to the air inlet pressure when the pressure relief valve works normally, the opening time of the pressure relief valve is controlled to be 0.01s through a fixed period, the closing time is controlled to be 0.01s after the opening time of the pressure relief valve is controlled to be 0.01s, and after a period of time T5, if the sum of absolute values of differences between the supercharging pressure and the air inlet pressure is detected to exceed the preset value, the fact that the supercharging pressure fluctuation is large is indicated, and the pressure relief valve works normally; the following calibration values need to be updated at this time:
updating the preset value p1 to be p1 x kp1 stored in the previous driving cycle;
the active opening and closing control and the monitoring updating of the pressure release valve are only updated once after the vehicle driving exceeds the preset mileage S, and the accumulated mileage is restarted after the updating is completed until the accumulated mileage reaches the preset mileage.
10. The method for monitoring the working performance of the electronic pressure relief valve for engine intake according to claim 4, wherein the method comprises the following steps:
before the step, if the mileage of the vehicle exceeds the preset mileage S, the following conditions are met, and the relief valve is actively controlled to check whether the relief valve is normal or not:
1) The engine speed exceeds 4500rpm, and the fluctuation range is +/-20 rpm;
2) The density of the inlet air exceeds 1600mgpl, and the fluctuation range is +/-15 mgpl;
3) The boost pressure is greater than the intake pressure, indicating that the throttle opening may be further increased to increase the intake pressure;
4) The temperature fluctuation range of the intake manifold is within +/-2.5 ℃;
5) The boost closed-loop control is activated;
6) The performance failure of the pressure release valve of the vehicle does not occur;
after the conditions meet the preset time T4 at the same time, the supercharging control is ensured to ensure that the supercharging pressure is close to the air inlet pressure when the pressure relief valve works normally, the opening time of the pressure relief valve is controlled to be 0.01s through a fixed period, the closing time is controlled to be 0.01s after the opening time of the pressure relief valve is controlled to be 0.01s, and after a period of time T5, if the sum of absolute values of differences between the supercharging pressure and the air inlet pressure is detected to exceed the preset value, the fact that the supercharging pressure fluctuation is large is indicated, and the pressure relief valve works normally; the following calibration values need to be updated at this time:
updating the preset value p2 to be p2 x kp2 stored in the previous driving cycle;
the active opening and closing control and the monitoring updating of the pressure release valve are only updated once after the vehicle driving exceeds the preset mileage S, and the accumulated mileage is restarted after the updating is completed until the accumulated mileage reaches the preset mileage.
11. The method for monitoring the working performance of the electronic pressure relief valve for engine intake according to claim 6, wherein the method comprises the following steps:
before the step, if the mileage of the vehicle exceeds the preset mileage S, the following conditions are met, and the relief valve is actively controlled to check whether the relief valve is normal or not:
1) The engine speed exceeds 4500rpm, and the fluctuation range is +/-20 rpm;
2) The density of the inlet air exceeds 1600mgpl, and the fluctuation range is +/-15 mgpl;
3) The boost pressure is greater than the intake pressure, indicating that the throttle opening may be further increased to increase the intake pressure;
4) The temperature fluctuation range of the intake manifold is within +/-2.5 ℃;
5) The boost closed-loop control is activated;
6) The performance failure of the pressure release valve of the vehicle does not occur;
after the conditions meet the preset time T4 at the same time, the supercharging control is ensured to ensure that the supercharging pressure is close to the air inlet pressure when the pressure relief valve works normally, the opening time of the pressure relief valve is controlled to be 0.01s through a fixed period, the closing time is controlled to be 0.01s after the opening time of the pressure relief valve is controlled to be 0.01s, and after a period of time T5, if the sum of absolute values of differences between the supercharging pressure and the air inlet pressure is detected to exceed the preset value, the fact that the supercharging pressure fluctuation is large is indicated, and the pressure relief valve works normally; the following calibration values need to be updated at this time:
updating the preset value C1 to be C1 x kc1 stored in the previous driving cycle;
the active opening and closing control and the monitoring updating of the pressure release valve are only updated once after the vehicle driving exceeds the preset mileage S, and the accumulated mileage is restarted after the updating is completed until the accumulated mileage reaches the preset mileage.
12. The method for monitoring the working performance of the electronic pressure relief valve for engine intake according to claim 8, wherein the method comprises the following steps:
before the step, if the mileage of the vehicle exceeds the preset mileage S, the following conditions are met, and the relief valve is actively controlled to check whether the relief valve is normal or not:
1) The engine speed exceeds 4500rpm, and the fluctuation range is +/-20 rpm;
2) The density of the inlet air exceeds 1600mgpl, and the fluctuation range is +/-15 mgpl;
3) The boost pressure is greater than the intake pressure, indicating that the throttle opening may be further increased to increase the intake pressure;
4) The temperature fluctuation range of the intake manifold is within +/-2.5 ℃;
5) The boost closed-loop control is activated;
6) The performance failure of the pressure release valve of the vehicle does not occur;
after the conditions meet the preset time T4 at the same time, the supercharging control is ensured to ensure that the supercharging pressure is close to the air inlet pressure when the pressure relief valve works normally, the opening time of the pressure relief valve is controlled to be 0.01s through a fixed period, the closing time is controlled to be 0.01s after the opening time of the pressure relief valve is controlled to be 0.01s, and after a period of time T5, if the sum of absolute values of differences between the supercharging pressure and the air inlet pressure is detected to exceed the preset value, the fact that the supercharging pressure fluctuation is large is indicated, and the pressure relief valve works normally; the following calibration values need to be updated at this time:
updating the preset value C2 to be C2 x kc2 stored in the previous driving cycle;
the active opening and closing control and the monitoring updating of the pressure release valve are only updated once after the vehicle driving exceeds the preset mileage S, and the accumulated mileage is restarted after the updating is completed until the accumulated mileage reaches the preset mileage.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02136516A (en) * 1988-11-16 1990-05-25 Mazda Motor Corp Controller for engine with supercharger
CN105673194A (en) * 2016-01-12 2016-06-15 中国第一汽车股份有限公司 Fault diagnosis system and method for engine air inlet relief valve blockage
CN109779742A (en) * 2019-03-21 2019-05-21 东风汽车集团有限公司 A kind of failure monitor system and method for engine charge electronics relief valve
CN113217179A (en) * 2021-05-07 2021-08-06 潍柴动力股份有限公司 Voltage-stabilizing air source electronic control air release valve pressurization control fault processing method and device
CN113330202A (en) * 2018-11-19 2021-08-31 纬湃科技有限责任公司 Apparatus and method for diagnosing a malfunction of a bypass valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02136516A (en) * 1988-11-16 1990-05-25 Mazda Motor Corp Controller for engine with supercharger
CN105673194A (en) * 2016-01-12 2016-06-15 中国第一汽车股份有限公司 Fault diagnosis system and method for engine air inlet relief valve blockage
CN113330202A (en) * 2018-11-19 2021-08-31 纬湃科技有限责任公司 Apparatus and method for diagnosing a malfunction of a bypass valve
CN109779742A (en) * 2019-03-21 2019-05-21 东风汽车集团有限公司 A kind of failure monitor system and method for engine charge electronics relief valve
CN113217179A (en) * 2021-05-07 2021-08-06 潍柴动力股份有限公司 Voltage-stabilizing air source electronic control air release valve pressurization control fault processing method and device

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