CN116181509A - Fault diagnosis method for upstream pressure sensor of EGR valve and vehicle - Google Patents

Fault diagnosis method for upstream pressure sensor of EGR valve and vehicle Download PDF

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Publication number
CN116181509A
CN116181509A CN202310198955.1A CN202310198955A CN116181509A CN 116181509 A CN116181509 A CN 116181509A CN 202310198955 A CN202310198955 A CN 202310198955A CN 116181509 A CN116181509 A CN 116181509A
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China
Prior art keywords
egr valve
upstream pressure
pressure sensor
limit value
correction amount
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CN202310198955.1A
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Chinese (zh)
Inventor
卫阳飞
徐帅卿
孙建颖
李辉
李亮
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Priority to CN202310198955.1A priority Critical patent/CN116181509A/en
Publication of CN116181509A publication Critical patent/CN116181509A/en
Pending legal-status Critical Current

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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
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
    • F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
    • 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)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The invention discloses a fault diagnosis method of an upstream pressure sensor of an EGR valve and a vehicle, wherein the fault diagnosis method of the upstream pressure sensor of the EGR valve comprises the following steps: determining an upstream pressure limit value of an EGR valve under the current working condition according to the engine speed, the load and the ambient pressure under the current working condition; judging whether the actual upstream pressure of the EGR valve is greater than or equal to the upstream pressure limit value of the EGR valve; if so, judging whether the correction of the knock retardation ignition angle of each cylinder under the current working condition is larger than or equal to the correction limit value of the knock retardation ignition angle, and whether the number of the cylinders with the correction of the knock retardation ignition angle larger than or equal to the correction limit value of the knock retardation ignition angle exceeds the number of the set cylinders; if the number of the cylinders exceeds the set number of cylinders, judging whether the absolute value of the closed-loop control correction amount of the opening degree of the EGR valve is larger than or equal to the limit value of the closed-loop control correction amount of the opening degree of the EGR valve; if yes, the fault of the upstream pressure sensor of the EGR valve is reported. Can be diagnosed during the operation of the engine.

Description

Fault diagnosis method for upstream pressure sensor of EGR valve and vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to a fault diagnosis method for an upstream pressure sensor of an EGR valve and a vehicle.
Background
EGR (Exhaust Gas Recirculation ) is installed at the exhaust end of an engine, and most of the exhaust gas of the engine is discharged into the air, and a part of the exhaust gas enters the intake end of the engine together with fresh air after passing through EGR, and is ignited in a cylinder to be burned again. Since the exhaust gas recirculated into the cylinder is inert, the combustion process will be retarded and the combustion rate will be slowed down, resulting in a slower pressure build-up in the combustion chamber, thereby reducing the nitrogen oxides in the engine exhaust, and the charge into the cylinder can be diluted with EGR, reducing the in-cylinder combustion temperature of the engine, thereby reducing the thermal load.
When adjusting the opening of the EGR valve, the correction of the opening of the EGR valve is obtained through PID closed-loop control according to the difference between the actual EGR flow and the target EGR flow, and then the feedforward value of the opening of the EGR valve is added with the correction of the opening of the EGR valve to obtain the final opening of the EGR valve. The actual EGR flow is calculated using the EGR valve upstream pressure, which is typically detected by an EGR valve upstream pressure sensor. When the pressure upstream of the EGR valve increases, the actual EGR flow rate obtained also increases, and the opening degree of the EGR valve needs to be reduced. If the upstream pressure sensor of the EGR valve is damaged, a signal of the rise of the upstream pressure of the EGR valve is sent erroneously, which causes the opening degree of the EGR valve to be adjusted erroneously, so that the engine cannot work smoothly.
However, in the prior art, the diagnosis of whether or not the EGR valve upstream pressure sensor has failed can be performed only in a stopped state by the deviation between the EGR valve upstream pressure, the throttle front pressure, and the throttle rear pressure, and whether or not the zero point drift can be monitored. The diagnosis cannot be performed in the working process of the engine, and whether dynamic drift exists cannot be determined.
Disclosure of Invention
The invention aims to provide a fault diagnosis method for an upstream pressure sensor of an EGR valve and a vehicle, and aims to solve the problem that in the prior art, whether the upstream pressure sensor of the EGR valve has a fault or not can only be diagnosed in a stop state, but not in the working process of an engine.
To achieve the purpose, the invention adopts the following technical scheme:
an EGR valve upstream pressure sensor failure diagnosis method, the EGR valve upstream being provided with an EGR valve upstream pressure sensor, the EGR valve upstream pressure sensor failure diagnosis method comprising:
s1: determining an upstream pressure limit value of an EGR valve under the current working condition according to the engine speed, the load and the ambient pressure under the current working condition;
s2: detecting the actual upstream pressure of the EGR valve in real time through the upstream pressure sensor of the EGR valve, and judging whether the actual upstream pressure of the EGR valve is larger than or equal to the limit value of the upstream pressure of the EGR valve;
if yes, S3 is carried out;
if not, ending diagnosis;
s3: judging whether the correction quantity of the knocking retarding ignition angle of each cylinder under the current working condition is larger than or equal to the correction quantity limit value of the knocking retarding ignition angle;
if the correction amount of the knock retard ignition angle of the cylinder is greater than or equal to the correction amount limit value of the knock retard ignition angle, S4 is performed;
ending the diagnosis if the correction amount of the knock retard ignition angle of no cylinder is equal to or greater than the correction amount limit value of the knock retard ignition angle;
s4: judging whether the number of cylinders of which the correction amount of the knock retard ignition angle is greater than or equal to the correction amount limit value of the knock retard ignition angle exceeds a set number of cylinders;
if yes, S5 is carried out;
if not, ending diagnosis;
s5: judging whether the absolute value of the closed-loop control correction amount of the EGR valve opening is larger than or equal to the limit value of the closed-loop control correction amount of the EGR valve opening;
if yes, reporting the fault of an upstream pressure sensor of the EGR valve;
if not, the diagnosis is ended.
As a preferred scheme of the fault diagnosis method for the upstream pressure sensor of the EGR valve, determining the upstream pressure limit value of the EGR valve under the current working condition according to the engine speed, the load and the ambient pressure under the current working condition includes:
obtaining a temporary limit value of the upstream pressure of the EGR valve according to the engine speed and the load;
obtaining a correction coefficient according to the environmental pressure;
and multiplying the temporary limit value of the upstream pressure of the EGR valve by the correction coefficient to obtain the limit value of the upstream pressure of the EGR valve.
As a preferable mode of the above-described failure diagnosis method for an EGR valve upstream pressure sensor, the obtaining of the EGR valve upstream pressure provisional limit value from the engine speed and the load includes:
and obtaining the temporary limit value of the upstream pressure of the EGR valve according to the engine speed and the load through an engine speed-load-temporary limit value relation table of the upstream pressure of the EGR valve.
As a preferable mode of the above-described failure diagnosis method for an EGR valve upstream pressure sensor, the obtaining of the correction coefficient based on the ambient pressure includes:
and obtaining the correction coefficient according to the ambient pressure through an ambient pressure-correction coefficient relation table.
As a preferable mode of the above-described failure diagnosis method of the EGR valve upstream pressure sensor, a correction amount of the knock retard ignition angle of each cylinder is obtained from the ECU.
As a preferable mode of the above-described failure diagnosis method for the EGR valve upstream pressure sensor, a closed-loop control correction amount of the EGR valve opening degree is obtained from the ECU.
As a preferable mode of the above-described failure diagnosis method for the EGR valve upstream pressure sensor, the engine speed is obtained by a speed sensor.
As a preferable mode of the above-described failure diagnosis method for the EGR valve upstream pressure sensor, the ambient pressure is obtained by an ambient pressure sensor.
The invention also provides a vehicle adopting the fault diagnosis method of the upstream pressure sensor of the EGR valve, the vehicle comprises an engine, the EGR valve and the upstream pressure sensor of the EGR valve, wherein the air inlet end of the EGR valve is communicated with the exhaust pipe of the engine, the air outlet end of the EGR valve is communicated with the air inlet pipe of the engine, and the upstream pressure sensor of the EGR valve is fixedly arranged upstream of the EGR valve.
As a preferable mode of the vehicle, the vehicle is further provided with an ECU, a rotation speed sensor for detecting an engine rotation speed, and an environmental pressure sensor for detecting an environmental pressure, both of which are electrically connected with the ECU.
The invention has the beneficial effects that:
the invention discloses a fault diagnosis method of an EGR valve upstream pressure sensor and a vehicle, wherein in the fault diagnosis method of the EGR valve upstream pressure sensor, when the actual upstream pressure of the EGR valve is larger than or equal to the upstream pressure limit value of the EGR valve, the number of cylinders with the correction value of a knock retard ignition angle larger than or equal to the correction value of the knock retard ignition angle exceeds the set number of cylinders, and meanwhile, the absolute value of the closed-loop control correction value of the opening degree of the EGR valve is larger than or equal to the closed-loop control correction value of the opening degree of the EGR valve, the fault of the EGR valve upstream pressure sensor is reported. The fault diagnosis of the upstream pressure sensor of the EGR valve can be carried out in the working process of the engine, and the fault of the upstream pressure sensor of the EGR valve can be prevented from being misreported due to the fact that the vehicle runs on a plateau and the components of the engine gas are bad, so that the fault diagnosis of the upstream pressure sensor of the EGR valve can be accurately carried out.
Drawings
FIG. 1 is a flow chart of a method for diagnosing a fault in an upstream pressure sensor of an EGR valve, in accordance with an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The invention provides a fault diagnosis method of an EGR valve upstream pressure sensor, wherein the EGR valve upstream pressure sensor is arranged on the upstream of the EGR valve, as shown in figure 1, the fault diagnosis method of the EGR valve upstream pressure sensor comprises the following steps:
s1: and determining an upstream pressure limit value of the EGR valve under the current working condition according to the engine speed, the load and the ambient pressure under the current working condition.
Specifically, according to the engine speed and load, obtaining a temporary limit value of the upstream pressure of the EGR valve; obtaining a correction coefficient according to the environmental pressure; and multiplying the temporary limit value of the upstream pressure of the EGR valve by the correction coefficient to obtain the limit value of the upstream pressure of the EGR valve.
The vehicle is provided with an ECU, a rotation speed sensor and an environmental pressure sensor, the rotation speed of the engine is obtained through the rotation speed sensor, and the rotation speed sensor can detect the rotation speed of the engine and transmit the rotation speed to the ECU; the environmental pressure is obtained through an environmental pressure sensor, and the environmental pressure sensor can detect the environmental pressure and transmit the environmental pressure to the ECU; the load of the engine can also be obtained from the ECU.
More specifically, the EGR valve upstream pressure provisional limit value is obtained from the engine speed-load-EGR valve upstream pressure provisional limit value relational table according to the engine speed and the load.
Wherein, the temporary limit value relation table of the engine speed-load-EGR valve upstream pressure is obtained by a plurality of tests in the earlier stage.
More specifically, the correction coefficient is obtained from the ambient pressure by an ambient pressure-correction coefficient relationship table.
Wherein, the relation table of the environmental pressure and the correction coefficient is obtained by a plurality of tests in the earlier stage.
S2: detecting the actual upstream pressure of the EGR valve in real time through an upstream pressure sensor of the EGR valve, and judging whether the actual upstream pressure of the EGR valve is larger than or equal to an upstream pressure limit value of the EGR valve or not; if yes, S3 is carried out; if not, the diagnosis is ended.
Wherein the EGR valve upstream pressure sensor is electrically connected to the ECU, and the EGR valve upstream pressure sensor transmits the detected EGR valve upstream pressure to the ECU. The EGR valve upstream pressure sensor failure diagnosis method is performed in the ECU.
When the actual upstream pressure of the EGR valve is greater than or equal to the limit value of the upstream pressure of the EGR valve, one of the two conditions is that the upstream pressure of the EGR valve is normal, the upstream pressure of the EGR valve transmitted to the ECU is the actual upstream pressure of the EGR valve, the ECU calculates the actual EGR flow according to the correct upstream pressure of the EGR valve, and obtains the closed-loop control correction quantity of the opening degree of the EGR valve through PID closed-loop control according to the difference value between the actual EGR flow and the target EGR flow, so that the opening degree of the EGR valve is regulated according to the closed-loop control correction quantity of the opening degree of the EGR valve. The second condition is that the EGR valve upstream pressure sensor fails, the EGR valve upstream pressure transmitted to the ECU is the wrong EGR valve upstream pressure, the real EGR valve upstream pressure does not exceed the EGR valve upstream pressure limit, the ECU calculates the actual EGR flow according to the wrong EGR valve upstream pressure, and obtains the closed-loop control correction of the EGR valve opening through PID closed-loop control according to the difference between the actual EGR flow and the target EGR flow, and then adjusts the opening of the EGR valve according to the closed-loop control correction of the EGR valve opening.
S3: judging whether the correction quantity of the knocking retarding ignition angle of each cylinder under the current working condition is larger than or equal to the correction quantity limit value of the knocking retarding ignition angle; if the correction amount of the knocking retarding ignition angle of the cylinder is larger than or equal to the correction amount limit value of the knocking retarding ignition angle, S4 is performed; if the correction amount of the knock retard ignition angle of no cylinder is equal to or larger than the correction amount limit value of the knock retard ignition angle, the diagnosis is ended.
If the correction amount of the knocking retard ignition angle of the cylinder is not less than or equal to the correction amount limit value of the knocking retard ignition angle, the EGR valve upstream pressure sensor is considered to be true in terms of the pressure transmitted to the EGR valve upstream in the ECU, and the EGR valve upstream pressure sensor is normal and has no failure.
S4: judging whether the number of cylinders of which the correction amount of the knock retard ignition angle is greater than or equal to the correction amount limit value of the knock retard ignition angle exceeds the set number of cylinders; if yes, S5 is carried out; if not, the diagnosis is ended.
Specifically, a correction amount of the knock retard ignition angle of each cylinder is obtained from the ECU. The vehicle has a knock protection function, the cylinder is provided with a knock sensor, the knock sensor is electrically connected with the ECU, the ignition angle retardation setting correction amount is controlled every time the knock sensor detects that the cylinder knocks, and the ignition angle retardation setting correction amount is recorded in the ECU until the knock sensor detects that the cylinder does not knocks, and the ignition angle total retardation angle is the correction amount of the knock retardation ignition angle, and the correction amount is stored in the ECU.
If the number of cylinders for which the correction amount of the knock retard ignition angle is equal to or greater than the correction amount limit of the knock retard ignition angle does not exceed the set number of cylinders, it is considered that the EGR valve upstream pressure transmitted from the EGR valve upstream pressure sensor to the ECU is also true, and the EGR valve upstream pressure sensor is normal and has no failure.
If the number of cylinders for which the correction amount of the knock retard ignition angle is equal to or greater than the correction amount limit of the knock retard ignition angle exceeds the set number of cylinders, it is considered that the EGR valve upstream pressure sensor may malfunction, and further determination is made at S5.
S5: judging whether the absolute value of the closed-loop control correction amount of the EGR valve opening is larger than or equal to the limit value of the closed-loop control correction amount of the EGR valve opening; if yes, reporting the fault of an upstream pressure sensor of the EGR valve; if not, the diagnosis is ended.
Specifically, a closed-loop control correction amount of the EGR valve opening degree is obtained from the ECU. The closed-loop control correction amount of the EGR valve opening degree is obtained by PID closed-loop control based on the difference between the actual EGR flow rate and the target EGR flow rate, and is stored in the ECU.
If the actual upstream pressure of the EGR valve is equal to or greater than the upstream pressure limit of the EGR valve, the number of cylinders for which the correction amount of the knock-retard ignition angle is equal to or greater than the correction amount limit of the knock-retard ignition angle exceeds the set number of cylinders, and the absolute value of the closed-loop control correction amount of the EGR valve opening is equal to or greater than the closed-loop control correction amount limit of the EGR valve opening, then the upstream pressure sensor of the EGR valve is considered to have failed.
When the vehicle is traveling in a plateau, the pressure upstream of the EGR valve is high, knocking is caused if the gas composition of the engine is poor, and at this time, the closed-loop control correction amount of the EGR valve opening degree is not high. The number of cylinders for which the EGR valve actually has an upstream pressure equal to or higher than the EGR valve upstream pressure limit and the correction amount of the knock retard ignition angle is equal to or higher than the correction amount limit of the knock retard ignition angle exceeds the set number of cylinders, which may be caused by the vehicle traveling in the plateau and the poor composition of the engine gas. Therefore, when the determination of the closed-loop control correction amount of the EGR valve opening is increased, and the number of cylinders for which the EGR valve actual upstream pressure is equal to or greater than the EGR valve upstream pressure limit and the correction amount of the knock retard ignition angle is equal to or greater than the correction amount limit of the knock retard ignition angle exceeds the set number of cylinders, but the absolute value of the closed-loop control correction amount of the EGR valve opening is smaller than the closed-loop control correction amount limit of the EGR valve opening, it is considered that the EGR valve upstream pressure sensor is normal, and false alarm of the EGR valve upstream pressure sensor failure caused when the vehicle is traveling in the plateau and the engine gas composition is poor can be prevented.
The invention also provides a vehicle, which adopts the fault diagnosis method of the upstream pressure sensor of the EGR valve, and comprises an engine, the EGR valve and the upstream pressure sensor of the EGR valve, wherein the air inlet end of the EGR valve is communicated with the exhaust pipe of the engine, the air outlet end of the EGR valve is communicated with the air inlet pipe of the engine, and the upstream pressure sensor of the EGR valve is fixedly arranged at the upstream of the EGR valve.
Optionally, the vehicle is further provided with an ECU, a rotational speed sensor for detecting the rotational speed of the engine, and an ambient pressure sensor for detecting the ambient pressure, both of which are electrically connected with the ECU.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

  1. An EGR valve upstream pressure sensor failure diagnosis method, characterized in that an EGR valve upstream pressure sensor is provided upstream of an EGR valve, actual upstream pressure of the EGR valve is detected in real time by the EGR valve upstream pressure sensor, the EGR valve upstream pressure sensor failure diagnosis method includes:
    s1: determining an upstream pressure limit value of an EGR valve under the current working condition according to the engine speed, the load and the ambient pressure under the current working condition;
    s2: judging whether the actual upstream pressure of the EGR valve is greater than or equal to the upstream pressure limit value of the EGR valve;
    if yes, S3 is carried out;
    if not, ending diagnosis;
    s3: judging whether the correction quantity of the knocking retarding ignition angle of each cylinder under the current working condition is larger than or equal to the correction quantity limit value of the knocking retarding ignition angle;
    if the correction amount of the knock retard ignition angle of the cylinder is greater than or equal to the correction amount limit value of the knock retard ignition angle, S4 is performed;
    ending the diagnosis if the correction amount of the knock retard ignition angle of no cylinder is equal to or greater than the correction amount limit value of the knock retard ignition angle;
    s4: judging whether the number of cylinders of which the correction amount of the knock retard ignition angle is greater than or equal to the correction amount limit value of the knock retard ignition angle exceeds a set number of cylinders;
    if yes, S5 is carried out;
    if not, ending diagnosis;
    s5: judging whether the absolute value of the closed-loop control correction amount of the EGR valve opening is larger than or equal to the limit value of the closed-loop control correction amount of the EGR valve opening;
    if yes, reporting the fault of an upstream pressure sensor of the EGR valve;
    if not, the diagnosis is ended.
  2. 2. The EGR valve upstream pressure sensor fault diagnosis method according to claim 1, wherein determining the EGR valve upstream pressure limit value for the current operating condition based on the engine speed, load, and ambient pressure for the current operating condition includes:
    obtaining a temporary limit value of the upstream pressure of the EGR valve according to the engine speed and the load;
    obtaining a correction coefficient according to the environmental pressure;
    and multiplying the temporary limit value of the upstream pressure of the EGR valve by the correction coefficient to obtain the limit value of the upstream pressure of the EGR valve.
  3. 3. The EGR valve upstream pressure sensor failure diagnosis method according to claim 2, wherein obtaining an EGR valve upstream pressure tentative limit value from the engine speed and load includes:
    and obtaining the temporary limit value of the upstream pressure of the EGR valve according to the engine speed and the load through an engine speed-load-temporary limit value relation table of the upstream pressure of the EGR valve.
  4. 4. The EGR valve upstream pressure sensor failure diagnosis method according to claim 2, wherein obtaining a correction coefficient based on the ambient pressure includes:
    and obtaining the correction coefficient according to the ambient pressure through an ambient pressure-correction coefficient relation table.
  5. 5. The EGR valve upstream pressure sensor failure diagnosis method according to any one of claims 1 to 4, characterized in that a correction amount of the knock-retarding ignition angle of each cylinder is obtained from an ECU.
  6. 6. The EGR valve upstream pressure sensor failure diagnosis method according to any one of claims 1 to 4, characterized in that a closed-loop control correction amount of the EGR valve opening degree is obtained from the ECU.
  7. 7. The EGR valve upstream pressure sensor failure diagnosis method according to any one of claims 1 to 4, characterized in that the engine speed is obtained by a speed sensor.
  8. 8. The EGR valve upstream pressure sensor failure diagnosis method according to any one of claims 1 to 4, characterized in that the ambient pressure is obtained by an ambient pressure sensor.
  9. 9. A vehicle, characterized in that the failure diagnosis method for an EGR valve upstream pressure sensor according to any one of claims 1 to 8 is employed, the vehicle includes an engine, an EGR valve, and an EGR valve upstream pressure sensor, an intake end of the EGR valve communicates with an exhaust pipe of the engine, an exhaust end of the EGR valve communicates with an intake pipe of the engine, and the EGR valve upstream pressure sensor is fixedly provided upstream of the EGR valve.
  10. 10. The vehicle according to claim 9, characterized in that the vehicle is further provided with an ECU, a rotational speed sensor for detecting an engine rotational speed, and an environmental pressure sensor for detecting an environmental pressure, both of which are electrically connected with the ECU.
CN202310198955.1A 2023-03-03 2023-03-03 Fault diagnosis method for upstream pressure sensor of EGR valve and vehicle Pending CN116181509A (en)

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CN202310198955.1A CN116181509A (en) 2023-03-03 2023-03-03 Fault diagnosis method for upstream pressure sensor of EGR valve and vehicle

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Application Number Priority Date Filing Date Title
CN202310198955.1A CN116181509A (en) 2023-03-03 2023-03-03 Fault diagnosis method for upstream pressure sensor of EGR valve and vehicle

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150233326A1 (en) * 2012-07-18 2015-08-20 Nissan Motor Co., Ltd. Internal combustion engine
JP2018145801A (en) * 2017-03-01 2018-09-20 本田技研工業株式会社 Failure determination device for humidity sensor
US20200332738A1 (en) * 2019-04-19 2020-10-22 Mazda Motor Corporation Method and system for determining abnormality of differential pressure sensor
CN115013172A (en) * 2022-06-15 2022-09-06 东风汽车集团股份有限公司 Method for processing abnormal pressure signal of inlet of EGR valve
CN116337328A (en) * 2023-04-14 2023-06-27 潍柴动力股份有限公司 Reliability detection method and device for upstream pressure sensor of EGR (exhaust gas Recirculation) system and vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150233326A1 (en) * 2012-07-18 2015-08-20 Nissan Motor Co., Ltd. Internal combustion engine
JP2018145801A (en) * 2017-03-01 2018-09-20 本田技研工業株式会社 Failure determination device for humidity sensor
US20200332738A1 (en) * 2019-04-19 2020-10-22 Mazda Motor Corporation Method and system for determining abnormality of differential pressure sensor
CN115013172A (en) * 2022-06-15 2022-09-06 东风汽车集团股份有限公司 Method for processing abnormal pressure signal of inlet of EGR valve
CN116337328A (en) * 2023-04-14 2023-06-27 潍柴动力股份有限公司 Reliability detection method and device for upstream pressure sensor of EGR (exhaust gas Recirculation) system and vehicle

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