CN112282922B - Method and device for detecting faults of pressure release valve - Google Patents

Method and device for detecting faults of pressure release valve Download PDF

Info

Publication number
CN112282922B
CN112282922B CN202011161398.9A CN202011161398A CN112282922B CN 112282922 B CN112282922 B CN 112282922B CN 202011161398 A CN202011161398 A CN 202011161398A CN 112282922 B CN112282922 B CN 112282922B
Authority
CN
China
Prior art keywords
pressure
boost
working condition
relief valve
threshold value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202011161398.9A
Other languages
Chinese (zh)
Other versions
CN112282922A (en
Inventor
梁锐
于秀林
王帅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chery Automobile Co Ltd
Original Assignee
Chery Automobile Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chery Automobile Co Ltd filed Critical Chery Automobile Co Ltd
Priority to CN202011161398.9A priority Critical patent/CN112282922B/en
Publication of CN112282922A publication Critical patent/CN112282922A/en
Application granted granted Critical
Publication of CN112282922B publication Critical patent/CN112282922B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/16—Control of the pumps by bypassing charging air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/22—Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits
    • F02B37/225—Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits air passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/16—Other safety measures for, or other control of, pumps
    • 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
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/16—Other safety measures for, or other control of, pumps
    • F02B2039/162—Control of pump parameters to improve safety thereof
    • F02B2039/166—Control of pump parameters to improve safety thereof the fluid pressure in the pump or exhaust drive being limited
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Abstract

The application discloses a method and a device for detecting faults of a pressure release valve, and relates to the technical field of automobiles, wherein the detection method comprises the following steps: sending a forced opening instruction to the pressure relief valve under a pressurization working condition, wherein the pressurization working condition is a working condition that the supercharger is in a working state, the rotating speed of the engine reaches a first rotating speed threshold value, and the opening degree of the throttle valve reaches the first opening degree threshold value; acquiring the supercharging pressure drop within a first set time after a forced opening instruction is sent; and when the pressure increase and pressure drop is lower than the pressure drop threshold value, generating fault information, wherein the fault information is used for indicating that the pressure release valve has clamping stagnation normally closed fault. The method and the device for detecting the faults of the pressure release valve can accurately detect whether the pressure release valve has the faults of clamping stagnation and normally closed.

Description

Method and device for detecting faults of pressure release valve
Technical Field
The application relates to the technical field of automobiles, in particular to a method and a device for detecting faults of a pressure release valve.
Background
In a vehicle equipped with a turbocharged engine, a supercharger compresses gas in the engine intake to increase engine power. If the driver releases the accelerator pedal while the supercharger is in operation, the load of the engine and the throttle opening degree are sharply reduced, and if the high-pressure gas compressed in the intake pipe cannot be discharged in time, surge may be caused. A pressure relief valve is therefore usually provided at the intake pipe of the engine, and at times, the gas within the supercharger is released. Surge can still occur if the relief valve jams in a normally closed position.
In the related art, since the function of the relief valve is simple, a sensor is not generally provided to detect the position of the valve element in the relief valve, and thus it is impossible to directly know whether the open/close condition of the relief valve is normal. The traditional fault detection of the pressure release valve mainly comprises the steps of detecting whether the boost pressure generated when the pressure release valve is opened for pressure release is greatly oscillated, counting oscillation times, and judging whether the pressure release valve has a clamping stagnation normally closed fault according to the oscillation times.
In the course of implementing the present application, the inventors found that the related art has at least the following problems: when the pressure relief valve is normally opened, the phenomenon of pressurization pressure oscillation may occur, so that the conventional method for detecting the fault of the pressure relief valve may generate erroneous judgment.
Disclosure of Invention
The embodiment of the application provides a method and a device for detecting faults of a pressure release valve, which can accurately detect whether the pressure release valve has the faults of clamping stagnation and normally closed. The specific technical scheme is as follows:
the embodiment of the application provides a method for detecting faults of a pressure release valve, which comprises the following steps:
sending a forced opening instruction to the pressure relief valve under a pressurization working condition, wherein the pressurization working condition is that the supercharger is in a working state, the rotating speed of the engine reaches a first rotating speed threshold value, and the opening degree of the throttle valve reaches the first opening degree threshold value;
acquiring the supercharging pressure drop within a first set time after the forced opening instruction is sent;
and when the pressure increase and pressure drop is lower than the pressure drop threshold value, generating fault information, wherein the fault information is used for indicating that the pressure release valve has a clamping stagnation normally closed fault.
In an implementation manner of the embodiment of the present application, under the pressurization working condition, to send the forced opening instruction to the pressure release valve, the method includes:
and in a second set time of the supercharging working condition, when the reduction amplitude of the opening of the throttle valve is lower than a second opening threshold value, the supercharging pressure reaches a second supercharging threshold value, and the vehicle speed is lower than a vehicle speed threshold value, a forced opening instruction is sent to the decompression valve.
In an implementation manner of the embodiment of the present application, the obtaining a boost pressure drop within a first set time after the forced opening instruction is sent includes:
and when the reduction amplitude of the throttle opening degree in the first set time is lower than a third opening degree threshold value, acquiring the supercharging pressure drop in the first set time.
In an implementation manner of the embodiment of the present application, before sending the forced opening instruction to the pressure relief valve, the method further includes:
acquiring boost pressure under a boost working condition;
when the boost pressure is lower than a first boost threshold value, ending the fault detection of the pressure relief valve;
and when the boost pressure reaches the first boost threshold, executing a step of sending a forced opening instruction to the relief valve.
In an implementation manner of the embodiment of the present application, under the pressurization working condition, before sending the forced opening instruction to the pressure release valve, the method further includes:
entering a first pressurization working condition, and sending an automatic opening instruction to the pressure release valve after the first pressurization working condition is finished;
counting the oscillation frequency of the supercharging pressure after the decompression valve is opened;
and entering a second pressurization working condition when the oscillation frequency reaches an oscillation threshold value, and executing the step of sending a forced opening instruction to the pressure relief valve.
The embodiment of the present application further provides a relief valve fault detection device, include:
the first sending module is configured to send a forced opening instruction to the pressure relief valve under a supercharging working condition, wherein the supercharging working condition refers to a working condition that the supercharger is in a working state, the engine speed reaches a first speed threshold, and the throttle opening reaches a first opening threshold;
the first acquisition module is configured to acquire a supercharging pressure drop in a first set time after the forced opening instruction is sent;
the generation module is configured to generate fault information when the boost pressure drop reaches a pressure drop threshold, wherein the fault information is used for indicating that the pressure relief valve has a clamping stagnation normally closed fault.
In one implementation manner of the embodiment of the application, the sending module is further configured to enter a second set time of the supercharging condition, the reduction amplitude of the throttle opening is lower than a second opening threshold, the supercharging pressure is lower than a second supercharging threshold, and when the vehicle speed is lower than a vehicle speed threshold, a forced opening instruction is sent to the pressure release valve.
In one implementation of the embodiment of the application, the obtaining module is further configured to obtain a boost pressure drop during the first set time when a reduction amplitude of the throttle opening degree during the first set time is lower than a third opening degree threshold.
In an implementation manner of the embodiment of the present application, the apparatus further includes:
the second acquisition module is configured to acquire the boost pressure under the boost working condition;
a first execution module configured to end the relief valve fault detection when the boost pressure is below a first boost threshold; and when the boost pressure reaches the first boost threshold value, sending a forced opening instruction to the pressure relief valve.
In an implementation manner of the embodiment of the present application, the apparatus further includes:
the second sending module is configured to enter a first pressurization working condition and send an automatic opening instruction to the pressure release valve after the first pressurization working condition is finished;
a counting module configured to count the oscillation frequency of the boost pressure after the relief valve is opened;
and the second execution module is configured to enter a second pressurization working condition when the oscillation frequency reaches an oscillation threshold value, and send a forced opening instruction to the pressure relief valve.
The beneficial effects of the embodiment of the application at least comprise:
according to the method and the device for detecting the faults of the pressure release valve, whether the pressure release valve has the clamping stagnation normally closed fault or not is judged by detecting the pressure increase pressure drop of a large amplitude or not when the pressure release valve is forcibly opened under the pressure increase working condition, and compared with the traditional fault detection method, the method and the device for detecting the faults of the pressure release valve only depend on the oscillation frequency of the pressure increase pressure to judge whether the pressure release valve has the faults or not, and the accuracy of fault detection of the pressure release valve is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for detecting a fault of a pressure relief valve according to an embodiment of the present application;
fig. 2 is a flowchart of another method for detecting a fault of a pressure relief valve according to an embodiment of the present disclosure;
FIG. 3 is a schematic illustration of a boost pressure provided by an embodiment of the present application;
fig. 4 is a flowchart of another method for detecting a fault of a pressure relief valve according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a relief valve fault detection device provided in an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides a method for detecting faults of a pressure release valve, as shown in fig. 1, the method comprises the following steps:
step S101, sending a forced opening instruction to a pressure relief valve under a pressurization working condition;
the supercharging working condition refers to the working condition that the supercharger is in a working state, the rotating speed of the engine reaches a first rotating speed threshold value, and the opening degree of the throttle valve reaches a first opening degree threshold value.
Step S102, acquiring the supercharging pressure drop within a first set time after the forced opening instruction is sent;
and step S103, generating fault information when the supercharging pressure drop is lower than the pressure drop threshold value.
The fault information is used for indicating that the clamping stagnation normally-closed fault exists in the pressure relief valve.
Optionally, under the pressurization operating condition, send the compulsory opening instruction to the relief valve, including:
and in a second set time of the supercharging working condition, the reduction amplitude of the opening of the throttle valve is lower than a second opening threshold, the supercharging pressure reaches a second supercharging threshold, and when the vehicle speed is lower than the vehicle speed threshold, a forced opening instruction is sent to the decompression valve.
Optionally, obtaining the boost pressure drop within a first set time after sending the forced opening command includes:
and when the reduction amplitude of the throttle opening degree in the first set time is lower than the third opening degree threshold value, acquiring the supercharging pressure drop in the first set time.
Optionally, before sending the forced opening instruction to the pressure relief valve, the method further includes:
acquiring boost pressure under a boost working condition;
when the boost pressure is lower than a first boost threshold value, ending the fault detection of the pressure relief valve;
and when the boost pressure reaches a first boost threshold value, sending a forced opening instruction to the relief valve.
Optionally, before sending the forced opening instruction to the pressure relief valve under the pressurization condition, the method further includes:
entering a first pressurization working condition, and sending an automatic opening instruction to the pressure release valve after the first pressurization working condition is finished;
counting the oscillation frequency of the supercharging pressure after the decompression valve is opened;
and when the oscillation frequency reaches an oscillation threshold value, entering a second pressurization working condition, and executing a step of sending a forced opening instruction to the pressure relief valve.
The pressure release valve fault detection method provided by the embodiment of the application judges whether the pressure release valve has a clamping stagnation normally closed fault by detecting the pressure increase pressure drop of a large amplitude or not when the pressure release valve is forcibly opened under the pressure increase working condition, and compared with the traditional fault detection method which judges whether the pressure release valve has a fault or not only by the oscillation frequency of the pressure increase pressure, the accuracy of pressure release valve fault detection is effectively improved.
The embodiment of the present application provides another method for detecting a fault of a relief valve, which may be executed by an ECU (Electronic Control Unit), as shown in fig. 2, and includes the following steps:
and step S201, under the supercharging working condition, acquiring supercharging pressure.
The supercharging working condition refers to the working condition that the supercharger is in a working state, the rotating speed of the engine reaches a first rotating speed threshold value, and the opening degree of the throttle valve reaches a first opening degree threshold value. In some embodiments of the present application, whether the supercharger is in the operating state may be determined according to the rotation speed of the supercharger. Specifically, the supercharger speed under the current working condition is obtained, and when the supercharger speed reaches a second speed threshold value, the supercharger can be considered to be in the working state.
Therefore, the step can judge whether the vehicle is in the supercharging working condition according to the rotating speed of the supercharger, the rotating speed of the engine and the opening degree of the throttle valve. When the engine speed is greater than the first speed threshold, the supercharger speed is greater than the second speed threshold, and the throttle opening reaches the first opening threshold, the vehicle can be considered to be under a supercharging working condition, and supercharging pressure is obtained. For example, the first rotation speed threshold may be 2000rpm/min, the second rotation speed threshold may be 8000rpm/min, and the first opening degree threshold may be 60%.
The boost pressure may be represented by the pressure of high-pressure gas in the engine intake pipe after being compressed by the supercharger, i.e., the pressure in the engine intake pipe after the supercharger.
Step S202, it is determined whether the boost pressure reaches the first boost threshold.
In this step, it may be determined whether the vehicle can normally establish the boost pressure by comparing the relationship between the boost pressure and the first boost threshold.
In some embodiments of the present application, the first boost threshold is related to engine speed, throttle opening, barometric pressure, and intake air temperature, and therefore the first boost threshold may be predetermined before determining whether the boost pressure reaches the first boost threshold.
Alternatively, the process of determining the first boost threshold may include: determining a boost pressure basic value according to a pre-established MAP table between the engine speed and the throttle opening and the boost pressure, and the engine speed and the throttle opening under the current boost working condition; correcting the boost pressure basic value according to the atmospheric pressure and the intake air temperature to obtain a boost pressure correction value; the boost pressure correction is adjusted downward by a preset value to determine a first boost threshold.
For example, the MAP table may include a correspondence between engine speed and throttle opening and boost pressure functions. The boost pressure function may include a boost pressure base value, a barometric pressure coefficient, and an intake air temperature coefficient.
For example, the boost pressure function may be P ═ P0+K1P1+K2And T. Wherein P is boost pressure, P0Is a boost pressure base value, K1Is a coefficient of atmospheric pressure, P1At atmospheric pressure, K2Is the intake air temperature coefficient, and T is the intake air temperature. The boost pressure base value can be obtained by testing the corresponding boost pressure under different engine speeds and throttle valve opening degrees on a bench.
And determining an applicable supercharging pressure function according to the rotating speed of the engine and the opening degree of a throttle valve, and substituting the current atmospheric pressure and the current air inlet temperature into the supercharging pressure function to obtain a first supercharging threshold value.
In the embodiment of the application, because the performances of different vehicles are different and the characteristics of configured superchargers are possibly different, the first supercharging threshold determined according to the MAP table may not be perfectly applicable to all vehicles, so that the supercharging pressure correction value is adjusted down to a preset value as the first supercharging threshold, a certain fault tolerance rate can be provided, and the accuracy of the method for detecting the fault of the pressure release valve is improved.
When the boost pressure is lower than the first boost threshold, step 203 described below is executed; when the boost pressure reaches the first boost threshold, step 204 described below is performed.
And step S203, finishing the fault detection of the pressure relief valve.
When the boost pressure is lower than the first boost threshold, the vehicle cannot normally build the boost pressure, and a fault other than the normally closed clamping of the relief valve exists in the vehicle, for example, a fault that the relief valve is normally open clamping of the relief valve may exist. When the boost pressure is detected to be lower than the first boost threshold, the fault detection of the pressure release valve is directly finished, and the fault detection efficiency of the pressure release valve can be improved.
Optionally, when the boost pressure is detected to be lower than the first boost threshold, the ECU may further generate an error message, wherein the error message is used for indicating that the vehicle has a fault except that the pressure relief valve is stuck to be normally closed, so as to prompt a user to further inspect relevant components in the engine system and confirm the fault reason.
And step S204, sending a forced opening instruction to the pressure relief valve.
In the step, under the pressurization working condition and when the pressurization working condition is not finished, the ECU sends a forced opening instruction to the pressure release valve, and the pressure release valve is immediately opened after receiving the forced opening instruction. If the pressure relief valve can be normally opened, the pressurization pressure can be greatly reduced; if the pressure relief valve has a stuck normally closed fault, the boost pressure does not change significantly, as shown in FIG. 3. In FIG. 3, the abscissa is time, which may be in units of s; the ordinate is the boost pressure, which may be in hPa (hectopascal); t is t0Sending a forced opening instruction for the ECU, namely the opening time t of the pressure relief valve0-t1The time period in between is the first set time.
As can be seen from fig. 3, there is a significant pressure difference between the relief valve opening curve and the relief valve closing curve over the first set time. Therefore, whether the pressure release valve has a clamping stagnation normally closed fault or not can be judged through the change of the pressurizing pressure after the pressure release valve is forced to be opened under the pressurizing working condition.
Meanwhile, even if the pressure relief valve has a clamping normally closed fault, the supercharging pressure is greatly reduced if a driver carelessly and greatly reduces the opening degree of an accelerator pedal before the supercharging working condition is not finished.
Alternatively, to eliminate erroneous judgment due to human factors, it may be detected whether the throttle opening, the boost pressure, and the vehicle speed satisfy preset conditions within the second set time of entering the boost condition. And when the parameters meet preset conditions, sending a forced opening instruction to the pressure release valve. When the supercharging working condition meets the condition that the duration time reaches the second set time, the reduction amplitude of the throttle opening within the second set time is lower than the second opening threshold, the supercharging pressure reaches the second supercharging threshold, and the vehicle speed is lower than the vehicle speed threshold, the decompression valve sends a forced opening instruction.
In the embodiment of the present application, the duration of the boost condition is defined to provide a sufficient amount of boost pressure change. After the pressurization operating mode lasts the second set time, the pressurization pressure can reach a higher and more stable value, thereby the change of the pressurization pressure after the decompression valve is opened can be better displayed. The vehicle speed is limited to avoid that the driver greatly reduces the opening degree of the accelerator pedal due to the too fast vehicle speed. The reduction amplitude and the supercharging pressure of the opening of the throttle valve can more intuitively represent whether human factor influence exists in the current supercharging working condition. For example, the second set time may be 1s, the second opening degree threshold may be 10%, the second supercharging threshold may be 150kpa, and the vehicle speed threshold may be 85 km/h.
And step S205, acquiring the supercharging pressure drop in the first set time after the forced opening instruction is sent.
In this step, the ECU detects the magnitude of the first boost pressure at the present time after sending the forced opening instruction to the relief valve. And the pressure relief valve is opened after receiving the forced opening instruction, and the current state is kept. And the ECU detects a second boost pressure after the relief valve is opened for a first set time, and the difference between the first boost pressure and the second boost pressure is the boost pressure drop within the first set time.
It will be appreciated that the response time of the pressure relief valve to full opening (if there is no stuck normally closed fault) after receiving a forced opening command should be much less than this first set time. In some embodiments of the present application, the first set time may be 1 s.
Alternatively, in order to avoid an influence of an artifact on the acquired boost pressure drop, the magnitude of decrease in the throttle opening degree within the first set time may be detected. And when the reduction amplitude of the throttle opening degree in the first set time is lower than the third opening degree threshold value, acquiring the supercharging pressure drop in the first set time. And when the reduction range of the throttle opening within the first set time exceeds a third opening threshold, ending the fault detection of the pressure relief valve at this time. The data acquired in the fault detection process of the pressure release valve is invalidated, the pressure boosting working condition can be entered again, and the fault detection process of the pressure release valve is carried out again. In some embodiments of the present application, the third threshold of openness may be 5%. In other embodiments of the present application, the third opening degree threshold may be equal to the second opening degree threshold.
And step S206, judging whether the supercharging pressure drop reaches a pressure drop threshold value.
In the step, whether the pressure relief valve has a clamping stagnation normally closed fault or not can be judged by comparing the relation between the pressurization pressure drop and the pressure drop threshold value. When the supercharging pressure drop reaches the pressure drop threshold, it can be determined that there is no stuck normally closed fault in the pressure relief valve, the above step S203 is executed, and the pressure relief valve fault detection is ended. When the supercharging pressure drop is lower than the pressure drop threshold, it can be considered that there is a failure of stuck normally closed in the relief valve, and step S207 described below is executed.
Step S207, generating failure information. The fault information is used for indicating that the clamping stagnation normally-closed fault exists in the pressure relief valve.
After the ECU generates the fault information, the fault information may be displayed on a display panel in the vehicle to prompt the user to remove the fault in time.
The pressure release valve fault detection method provided by the embodiment of the application judges whether the pressure release valve has a clamping stagnation normally closed fault by detecting the pressure increase pressure drop of a large amplitude or not when the pressure release valve is forcibly opened under the pressure increase working condition, and compared with the traditional fault detection method which judges whether the pressure release valve has a fault or not only by the oscillation frequency of the pressure increase pressure, the accuracy of pressure release valve fault detection is effectively improved.
The embodiment of the application also provides another method for detecting the fault of the pressure release valve, which can be executed by the ECU, and the fault detection process of the pressure release valve is completed through twice pressurization working conditions. As shown in fig. 4, the method may include:
and S401, under the first supercharging working condition, acquiring supercharging pressure.
Step S402 determines whether the boost pressure reaches a first boost threshold.
When the boost pressure is lower than the first boost threshold, step S403 described below is executed; when the boost pressure reaches the first boost threshold value, step S404 described below is executed.
And step S403, ending the fault detection of the pressure relief valve.
The above steps S401 to S403 are similar to the implementation process of the steps S201 to S203 shown in fig. 2, and are not described again here.
And S404, sending an automatic opening instruction to the pressure relief valve after the first pressurization working condition is finished.
When the boost pressure reaches the first boost threshold, the vehicle can normally build the boost pressure, and in this case, whether the pressure relief valve has a clamping stagnation normally-closed fault can be continuously detected.
In some embodiments of the present application, the ECU sends an automatic opening command to the pressure relief valve, the automatic opening command may indicate to the pressure relief valve that the supercharging conditions have ended, and the pressure relief valve opens upon receiving the automatic opening command to release gas within the supercharger.
And S405, counting the oscillation frequency of the pressurization pressure after the relief valve is opened.
When the pressure release valve has a clamping stagnation normally closed fault, the pressure release valve is difficult to normally open after the pressurization working condition is finished, so that gas in the supercharger is difficult to timely release, and the pressurization pressure can oscillate. However, the boost pressure oscillations may also be caused by other reasons, such as too high a boost pressure under boost conditions, or too slow a rotational speed of the supercharger, etc.
In this step, the oscillation frequency may be counted first to determine whether there is a fault that the suspected pressure release valve is stuck and normally closed according to the oscillation frequency, and if there is a fault that the suspected pressure release valve is stuck and normally closed, the fault detection of the pressure release valve is continued.
Step S406, judging whether the oscillation frequency reaches an oscillation threshold value.
In this step, whether a fault that the suspected pressure relief valve is stuck and normally closed exists in the vehicle can be judged by comparing the relationship between the oscillation frequency and the oscillation threshold.
When the oscillation frequency is lower than the oscillation threshold, the above-described step S403 is executed, and the relief valve failure detection is ended.
When the number of oscillations reaches the oscillation threshold, step S407 described below is executed.
In the method for detecting the faults of the pressure release valve, whether the fault suspected of clamping stagnation and normally closed of the pressure release valve exists or not can be confirmed through the oscillation times, and whether the fault suspected of clamping stagnation and normally closed of the pressure release valve exists or not is further confirmed, so that the accuracy of fault detection of the pressure release valve can be improved.
And step S407, entering a second pressurization working condition, and sending a forced opening instruction to the pressure relief valve.
In some embodiments of the present application, when the vehicle enters the second supercharging operating condition, before the forced opening instruction is sent to the pressure relief valve, the above steps S401 to S402 may be repeated to eliminate a fault other than the normal close of the pressure relief valve due to jamming.
The second supercharging condition and the first supercharging condition can be suitable for the same first rotating speed threshold value, the same second rotating speed threshold value and the same first opening degree threshold value, namely the first supercharging condition and the second supercharging condition are the same. In other embodiments of the present application, the first boost operating condition and the second boost operating condition may also be different operating conditions.
And step S408, acquiring the supercharging pressure drop in the first set time after the forced opening instruction is sent.
And step S409, judging whether the supercharging pressure drop reaches a pressure drop threshold value.
Step S410, generating failure information. The fault information is used for indicating that the clamping stagnation normally-closed fault exists in the pressure relief valve.
The above steps S407 to S410 are similar to the implementation process of steps S204 to S207 shown in fig. 2, and are not described again here.
The pressure release valve fault detection method provided by the embodiment of the application judges whether the pressure release valve has a clamping stagnation normally closed fault by detecting the pressure increase pressure drop of a large amplitude or not when the pressure release valve is forcibly opened under the pressure increase working condition, and compared with the traditional fault detection method which judges whether the pressure release valve has a fault or not only by the oscillation frequency of the pressure increase pressure, the accuracy of pressure release valve fault detection is effectively improved.
The embodiment of the present application further provides a relief valve fault detection device, as shown in fig. 5, including:
the first sending module 501 is configured to send a forced opening instruction to the pressure relief valve under a supercharging working condition, where the supercharging working condition is that the supercharger is in a working state, the engine speed reaches a first speed threshold, and the throttle opening reaches a first opening threshold;
a first obtaining module 502 configured to obtain a boost pressure drop within a first set time after the forced opening instruction is sent;
a generating module 503 configured to generate fault information when the boost pressure drop is lower than a pressure drop threshold, wherein the fault information is used for indicating that the pressure relief valve has a stuck normally closed fault.
Optionally, the sending module may be further configured to send a forced opening instruction to the pressure relief valve when the throttle opening degree is reduced by a magnitude lower than a second opening degree threshold, the boost pressure reaches a second boost threshold, and the vehicle speed is lower than a vehicle speed threshold in a second set time of the boost condition.
Optionally, the obtaining module may be further configured to obtain a boost pressure drop during the first set time when a reduction magnitude of the throttle opening degree during the first set time is lower than a third opening degree threshold.
Optionally, the apparatus may further comprise:
the second acquisition module is configured to acquire the boost pressure under the boost working condition;
a first execution module configured to end the relief valve fault detection when the boost pressure is below a first boost threshold; and when the boost pressure reaches the first boost threshold value, sending a forced opening instruction to the pressure relief valve.
Optionally, the apparatus may further comprise:
the second sending module is configured to enter a first pressurization working condition and send an automatic opening instruction to the pressure release valve after the first pressurization working condition is finished;
a counting module configured to count the oscillation frequency of the boost pressure after the relief valve is opened;
and the second execution module is configured to enter a second pressurization working condition when the oscillation frequency reaches an oscillation threshold value, and execute the step of sending a forced opening instruction to the pressure relief valve.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the functional modules is illustrated, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to implement all or part of the functions described above. In addition, the apparatus and method embodiments provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments for details, which are not described herein again.
The application provides a computer-readable storage medium, in which at least one instruction is stored, and the at least one instruction is loaded and executed by the processor to implement the method for detecting the fault of the pressure relief valve provided by each method embodiment.
Those skilled in the art will understand that all or part of the steps in the method for detecting a fault of a pressure relief valve according to the above embodiment may be implemented by hardware, or may be implemented by a program instructing the relevant hardware to implement the steps.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A method for detecting faults of a pressure release valve is characterized by comprising the following steps:
sending a forced opening instruction to the pressure relief valve under a pressurization working condition, wherein the pressurization working condition is that the supercharger is in a working state, the rotating speed of the engine reaches a first rotating speed threshold value, and the opening degree of the throttle valve reaches the first opening degree threshold value;
acquiring the supercharging pressure drop within a first set time after the forced opening instruction is sent;
when the supercharging pressure drop is lower than a pressure drop threshold value, fault information is generated, and the fault information is used for indicating that the pressure release valve has a clamping stagnation normally closed fault:
wherein under the pressure boost operating mode, send to the relief valve and force opening the instruction, include: and in a second set time of the supercharging working condition, when the reduction amplitude of the opening of the throttle valve is lower than a second opening threshold value, the supercharging pressure reaches a second supercharging threshold value, and the vehicle speed is lower than a vehicle speed threshold value, the forced opening instruction is sent to the decompression valve.
2. The method of claim 1, wherein said obtaining a boost pressure drop within a first set time after said sending a forced open command comprises:
and when the reduction amplitude of the throttle opening degree in the first set time is lower than a third opening degree threshold value, acquiring the supercharging pressure drop in the first set time.
3. The method of claim 1, wherein prior to sending the forced opening command to the pressure relief valve, the method further comprises:
acquiring boost pressure under a boost working condition;
when the boost pressure is lower than a first boost threshold value, ending the fault detection of the pressure relief valve;
and when the boost pressure reaches the first boost threshold, executing a step of sending a forced opening instruction to the relief valve.
4. The method of claim 1, wherein during the boost condition, before sending a forced open command to the pressure relief valve, the method further comprises:
entering a first pressurization working condition, and sending an automatic opening instruction to the pressure release valve after the first pressurization working condition is finished;
counting the oscillation frequency of the supercharging pressure after the decompression valve is opened;
and entering a second pressurization working condition when the oscillation frequency reaches an oscillation threshold value, and executing the step of sending a forced opening instruction to the pressure relief valve.
5. A pressure relief valve fault detection device, characterized by comprising:
the first sending module is configured to send a forced opening instruction to the pressure relief valve under a supercharging working condition, wherein the supercharging working condition refers to a working condition that the supercharger is in a working state, the engine speed reaches a first speed threshold, and the throttle opening reaches a first opening threshold;
the first acquisition module is configured to acquire a supercharging pressure drop in a first set time after the forced opening instruction is sent;
the generation module is configured to generate fault information when the boost pressure drop is lower than a pressure drop threshold, wherein the fault information is used for indicating that the pressure relief valve has a clamping stagnation normally-closed fault;
the first sending module is further configured to send the forced opening instruction to the pressure relief valve when the opening degree of the throttle valve is smaller than a second opening degree threshold value, the boost pressure reaches a second boost threshold value, and the vehicle speed is lower than a vehicle speed threshold value in a second set time of the boost working condition.
6. The apparatus of claim 5, wherein the first obtaining module is further configured to obtain a boost pressure drop over the first set time when a magnitude of a decrease in the throttle opening for the first set time is below a third opening threshold.
7. The apparatus of claim 5, further comprising:
the second acquisition module is configured to acquire the boost pressure under the boost working condition;
a first execution module configured to end the relief valve fault detection when the boost pressure is below a first boost threshold; and when the boost pressure reaches the first boost threshold value, sending a forced opening instruction to the pressure relief valve.
8. The apparatus of claim 5, further comprising:
the second sending module is configured to enter a first pressurization working condition and send an automatic opening instruction to the pressure release valve after the first pressurization working condition is finished;
a counting module configured to count the oscillation frequency of the boost pressure after the relief valve is opened;
and the second execution module is configured to enter a second pressurization working condition when the oscillation frequency reaches an oscillation threshold value, and execute the step of sending a forced opening instruction to the pressure relief valve.
CN202011161398.9A 2020-10-27 2020-10-27 Method and device for detecting faults of pressure release valve Active CN112282922B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011161398.9A CN112282922B (en) 2020-10-27 2020-10-27 Method and device for detecting faults of pressure release valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011161398.9A CN112282922B (en) 2020-10-27 2020-10-27 Method and device for detecting faults of pressure release valve

Publications (2)

Publication Number Publication Date
CN112282922A CN112282922A (en) 2021-01-29
CN112282922B true CN112282922B (en) 2021-12-28

Family

ID=74372225

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011161398.9A Active CN112282922B (en) 2020-10-27 2020-10-27 Method and device for detecting faults of pressure release valve

Country Status (1)

Country Link
CN (1) CN112282922B (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5185147B2 (en) * 2009-01-23 2013-04-17 日立オートモティブシステムズ株式会社 Fuel supply device for internal combustion engine
FR2978211B1 (en) * 2011-07-19 2013-08-23 Snecma METHOD FOR MONITORING A PRESSURE RELIEF VALVE OF A FUEL INJECTION CIRCUIT FOR TURBOMACHINE
CN103742256B (en) * 2013-12-24 2016-03-16 潍柴动力股份有限公司 Motor, engine supercharger guard method and device
CN105673194B (en) * 2016-01-12 2018-04-06 中国第一汽车股份有限公司 The method for diagnosing faults of engine charge relief valve obstruction
CN106121844A (en) * 2016-08-31 2016-11-16 潍柴动力股份有限公司 Detection method, device and the automobile of a kind of vent valve Block failure

Also Published As

Publication number Publication date
CN112282922A (en) 2021-01-29

Similar Documents

Publication Publication Date Title
CN109281759B (en) System and method for diagnosing leakage of oil tank by adopting pressure sensor
CN110816508B (en) Vehicle fault detection method and device, vehicle and storage medium
US6666201B1 (en) System and method for diagnosing EGR performance using NOx sensor
CN109083756B (en) Engine air inlet fault detection method and device
CN110671222A (en) Fuel leakage diagnosis method, device and computer readable storage medium
US20170016402A1 (en) Apparatus and method for controlling intake surge noise of engine of vehicle
US6308119B1 (en) Preset diagnostic leak detection method for an automotive evaporative emission system
US20030061864A1 (en) Engine off natural vacuum leakage check for onboard diagnostics
CA2413043A1 (en) Alternator testing method and system using ripple detection
US10859012B2 (en) Method and system for diagnosing fault of dual purge system
CN113176036A (en) Fault detection method and device for engine intake pressure sensor
CN102834602B (en) Method and device for detecting the blockage of a gasoline vapor filter bleed valve
CN110145398B (en) Diesel engine detection method and device
CN112282922B (en) Method and device for detecting faults of pressure release valve
US20090100921A1 (en) Intake air temperature sensor diagnostic
CN109751136B (en) Control device for internal combustion engine
CN111267756A (en) Vehicle speed limit control method, vehicle and medium
US6560963B2 (en) Variable timing to avoid turbocharger overspeed while engine braking under different atmospheric conditions
CN109094536B (en) Vehicle control method and device and vehicle
CN114352442B (en) Fuel evaporation system diagnosis method and device
JP4155807B2 (en) Knock detection device
CN114592974B (en) Decompression method and decompression device of engine supercharging system, storage medium and vehicle
US6571778B2 (en) Method for testing the leak-tightness of a fuel tank
EP0295651B1 (en) Method and device for controlling the ignition timing of internal combustion engines
JP5428960B2 (en) Internal combustion engine

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant