CN-121993281-A - Method and device for determining fault type of air-driven urea system in vehicle and vehicle

CN121993281ACN 121993281 ACN121993281 ACN 121993281ACN-121993281-A

Abstract

The application discloses a fault type determining method and device of an air-driven urea system in a vehicle and the vehicle. The method comprises the steps of responding to the fact that the air-driven urea system is in a first working state, obtaining first pressure information of the air-driven urea system and the duty ratio of the urea nozzle, detecting the air-driven urea system based on the first pressure information and the duty ratio to obtain a detection result, responding to the detection result to indicate that the air-driven urea system breaks down, controlling the state of the air-driven urea system to be switched from the first working state to a second working state, and determining the fault type of the fault based on the second pressure information of the air-driven urea system in the second working state, wherein the second pressure information is used for indicating the fluctuation degree of the pressure of the air-driven urea system in the second working state. The application solves the technical problem of low fault type determination efficiency of the urea system in the vehicle.

Inventors

LONG YUAN
LIU HAONAN
ZHANG CONG
WANG KEXING

Assignees

一汽解放汽车有限公司

Dates

Publication Date: 20260508
Application Date: 20260306

Claims (12)

1. A method of determining a type of fault in an air-driven urea system in a vehicle, the air-driven urea system comprising a urea nozzle and a blowback valve, the method comprising: acquiring first pressure information of the gas-driven urea system and a duty ratio of the urea nozzle in response to the gas-driven urea system being in a first working state, wherein the first working state is an injection state of injecting urea into gas discharged by the vehicle by using the urea nozzle, and the first pressure information is used for indicating fluctuation degree of the pressure of the gas-driven urea system in the first working state; Detecting the gas-driven urea system based on the first pressure information and the duty ratio to obtain a detection result; Responding to the detection result to indicate that the gas-driven urea system fails, and controlling the state of the gas-driven urea system to be switched from the first working state to a second working state, wherein the second working state is a state of executing a back blowing function to the urea nozzle by using the back blowing valve; And determining the fault type of the fault based on second pressure information of the gas-driven urea system in the second working state, wherein the second pressure information is used for indicating the fluctuation degree of the pressure of the gas-driven urea system in the second working state.
2. The method of claim 1, wherein detecting the gas-driven urea system based on the pressure information and the duty cycle, results in a detection result, comprising: Detecting the gas-driven urea system based on the duty ratio to obtain a first sub-detection result, wherein the first sub-detection result is used for indicating the frequency state of the urea nozzle for spraying the urea; detecting the gas-driven urea system based on the pressure information to obtain a second sub-detection result, wherein the second sub-detection result is used for indicating the smoothness of the urea spraying process of the urea nozzle; the detection result is determined based on the first sub-detection result and the second sub-detection result.
3. The method of claim 2, wherein detecting the gas-driven urea system based on the duty cycle results in the first sub-detection result, comprising: Determining that the first sub-detection result indicates that the frequency state is an abnormal frequency state in response to the duty cycle being greater than a duty cycle threshold; and determining that the first sub-detection result represents that the frequency state is a normal frequency state in response to the duty cycle being less than or equal to the duty cycle threshold.
4. A method according to claim 3, wherein detecting the gas-driven urea system based on the first pressure information, resulting in the second sub-detection result, comprises: Determining that the second sub-detection result indicates that the smoothness is in an abnormal state in response to the first pressure information being less than a first pressure information threshold; And determining that the second sub-detection result indicates that the smoothness degree is in a normal state in response to the first pressure information being greater than or equal to the first pressure information threshold.
5. The method of claim 3, wherein determining the detection result based on the first sub-detection result and the second sub-detection result comprises: and responding to the first sub-detection result to indicate that the frequency state is the abnormal frequency state, and determining that the smoothness degree is in an abnormal state in the preset number of injection periods of the urea nozzle, wherein the detection result indicates that the gas-driven urea system is in the fault.
6. The method of claim 1, wherein obtaining first pressure information for the gas-driven urea system in response to the gas-driven urea system being in a first operating state comprises: responding to the first working state of the gas-driven urea system, and acquiring the maximum pressure and the minimum pressure of the gas-driven urea system; and determining a pressure difference between the maximum pressure and the minimum pressure as the first pressure information.
7. The method of claim 1, wherein the gas-driven urea system includes an exhaust valve, a urea tank, and a pipeline, and wherein controlling the state of the gas-driven urea system to switch from the first operating state to the second operating state in response to the detection indicating that the gas-driven urea system is malfunctioning comprises: Responding to the detection result to indicate that the gas-driven urea system fails, triggering the exhaust valve to execute an exhaust function, and acquiring the air pressure value in the urea tank in the process of executing the exhaust function; And controlling the state of the gas-driven urea system to enter the second working state from the first working state in response to the gas pressure value being smaller than a gas pressure threshold value, wherein in the second working state, the back-flushing valve is used for flushing the urea in the pipeline back to the urea tank.
8. The method of any one of claims 1 to 7, wherein the gas-driven urea system includes a urea cartridge, the fault type includes a first urea cartridge fault and a second urea cartridge fault, the second urea cartridge fault has a severity greater than the severity of the first urea cartridge fault, determining the fault type of the fault based on second pressure information of the gas-driven urea system in the second operating state includes: Responding to the second working state of the gas-driven urea system, driving the urea nozzle to be opened for preset times, and acquiring the second pressure information in the process of opening the urea nozzle; Determining the fault type as the first urea filter fault in response to the second pressure information being greater than a second pressure information threshold; Controlling the urea nozzle to be closed, and obtaining a pressure value of the gas-driven urea system, wherein the pressure value is used for indicating the pressure of the gas-driven urea system in the process that the urea nozzle is in a closed state; and determining that the fault type is the second urea filter fault in response to the pressure value being greater than a first pressure threshold.
9. The method of claim 8, wherein the gas-driven urea system includes a urea line, the fault type includes a urea line fault and a nozzle fault, determining the fault type of the fault based on second pressure information of the gas-driven urea system in the second operating state includes: Responding to the condition that the gas-driven urea system is in the second working state, wherein the second pressure information is smaller than the second pressure information threshold value, the pressure value is smaller than the second pressure threshold value, and the fault type is determined to be the urea pipeline fault; and responding to the condition that the gas-driven urea system is in the second working state, wherein the second pressure information is smaller than the second pressure information threshold value, the pressure value is larger than or equal to the second pressure threshold value, and the fault type is determined to be the nozzle fault.
10. A fault type determination apparatus for an air-driven urea system in a vehicle, the air-driven urea system including a urea nozzle and a blowback valve, the apparatus comprising: The system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for responding to the first working state of the gas-driven urea system, acquiring first pressure information of the gas-driven urea system and the duty ratio of the urea nozzle, wherein the first working state is an injection state of injecting urea into gas discharged by the vehicle by utilizing the urea nozzle, and the first pressure information is used for indicating the fluctuation degree of the pressure of the gas-driven urea system in the first working state; The detection unit is used for detecting the gas-driven urea system based on the first pressure information and the duty ratio to obtain a detection result; The control unit is used for responding to the detection result to indicate that the air-driven urea system fails, and controlling the state of the air-driven urea system to be switched from the first working state to a second working state, wherein the second working state is a state of executing a back blowing function to the urea nozzle by utilizing the back blowing valve; The determining unit is used for determining the fault type of the fault based on second pressure information of the gas-driven urea system in the second working state, wherein the second pressure information is used for indicating the fluctuation degree of the pressure of the gas-driven urea system in the second working state.
11. A vehicle, characterized by comprising: A memory storing an executable program; a processor for executing the program, wherein the program when run performs the method of any of claims 1 to 9.
12. An electronic device, comprising: A memory storing an executable program; a processor for executing the program, wherein the program when run performs the method of any of claims 1 to 9.

Description

Method and device for determining fault type of air-driven urea system in vehicle and vehicle Technical Field The application relates to the field of vehicles, in particular to a fault type determining method and device of an air-driven urea system in a vehicle and the vehicle. Background At present, a fault type determining method of a urea system in a vehicle mainly monitors parameters such as a urea liquid level, a temperature, an injection quantity and the like in the urea system in a urea injection process. However, the above method requires a long detection time and cannot locate the fault type quickly in real time. Therefore, there still exists a technical problem that the failure type determination efficiency of the urea system in the vehicle is low. In view of the above technical problems, no effective solution has been proposed at present. Disclosure of Invention The embodiment of the application provides a method and a device for determining the fault type of an air-driven urea system in a vehicle and the vehicle, and aims to at least solve the technical problem of low efficiency of determining the fault type of the urea system in the vehicle. According to one aspect of an embodiment of the present application, a method for determining a fault type of a gas-driven urea system in a vehicle is provided. The method comprises the steps of responding to the fact that the air-driven urea system is in a first working state, obtaining first pressure information of the air-driven urea system and the duty ratio of the urea nozzle, wherein the first working state is an injection state of injecting urea into gas discharged by a vehicle through the urea nozzle, the first pressure information is used for indicating the fluctuation degree of the pressure of the air-driven urea system in the first working state, detecting the air-driven urea system based on the first pressure information and the duty ratio to obtain a detection result, responding to the detection result to indicate that the air-driven urea system breaks down, controlling the state of the air-driven urea system to be switched from the first working state to a second working state, wherein the second working state is a state of executing a back blowing function to the urea nozzle through the back blowing valve, and determining the fault type of the air-driven urea system based on the second pressure information of the air-driven urea system in the second working state, wherein the second pressure information is used for indicating the fluctuation degree of the pressure of the air-driven urea system in the second working state. Optionally, the gas-driven urea system is detected based on the pressure information and the duty ratio to obtain a detection result, wherein the detection result comprises the detection of the gas-driven urea system based on the duty ratio to obtain a first sub-detection result, the first sub-detection result is used for indicating the frequency state of urea injection by the urea nozzle, the detection of the gas-driven urea system based on the pressure information to obtain a second sub-detection result, the second sub-detection result is used for indicating the smoothness of the urea injection process by the urea nozzle, and the detection result is determined based on the first sub-detection result and the second sub-detection result. Optionally, the air-driven urea system is detected based on the duty ratio to obtain a first sub-detection result, wherein the first sub-detection result comprises the steps of determining that the frequency state is an abnormal frequency state in response to the duty ratio being larger than the duty ratio threshold value, and determining that the frequency state is a normal frequency state in response to the duty ratio being smaller than or equal to the duty ratio threshold value. Optionally, the gas-driven urea system is detected based on the first pressure information to obtain a second sub-detection result, wherein the detection comprises the steps of determining that the second sub-detection result indicates that the smoothness degree is in an abnormal state in response to the fact that the first pressure information is smaller than a first pressure information threshold value, and determining that the second sub-detection result indicates that the smoothness degree is in a normal state in response to the fact that the first pressure information is larger than or equal to the first pressure information threshold value. Optionally, determining the detection result based on the first sub-detection result and the second sub-detection result includes determining that the detection result indicates that the gas-driven urea system fails in response to the first sub-detection result indicating that the frequency state is an abnormal frequency state and that the smoothness is in an abnormal state within a preset number of injection cycles of the urea nozzle. Optionally, the first pressure infor