CN-122017399-A - Vehicle insulation resistance detection method, vehicle and storage medium

CN122017399ACN 122017399 ACN122017399 ACN 122017399ACN-122017399-A

Abstract

The embodiment of the application provides a vehicle insulation resistance detection method, a vehicle and a storage medium, wherein the method comprises the steps of obtaining sampling voltage data of an insulation detection circuit, wherein the insulation detection circuit is used for detecting a first insulation resistance between a power battery anode and a vehicle shell of a target vehicle and a second insulation resistance between a power battery cathode and the vehicle shell; the method comprises the steps of sampling voltage data, screening the sampled voltage data to obtain a data screening result, conducting insulation detection based on the data screening result to obtain a detection result, wherein the detection result is used for determining an anode insulation state and a cathode insulation state corresponding to an insulation detection circuit, and generating a vehicle maintenance instruction of a target vehicle by using the detection result. The application solves the technical problems of lower performance detection efficiency and lower accuracy of the vehicle insulation resistance in the related technology.

Inventors

JIANG TAO
Xu Geqian
JIN ZILONG
LIU GUOLONG
Ma Pingqiang

Assignees

奇瑞汽车股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260114

Claims (10)

1. A vehicle insulation resistance detection method, characterized by comprising: Acquiring sampling voltage data of an insulation detection circuit, wherein the insulation detection circuit is used for detecting a first insulation resistance between a power battery anode of a target vehicle and a vehicle shell and a second insulation resistance between a power battery cathode and the vehicle shell; Screening the sampled voltage data to obtain a data screening result; performing insulation detection based on the data screening result to obtain a detection result, wherein the detection result is used for determining an anode insulation state and a cathode insulation state corresponding to the insulation detection circuit; And generating a vehicle maintenance instruction of the target vehicle by using the detection result.
2. The method of claim 1, wherein the insulation detection circuit comprises a first switch for controlling a communication state of a positive detection branch in the bridge detection circuit, a second switch for controlling a communication state of a negative detection branch in the bridge detection circuit, and a bridge detection circuit, wherein obtaining the sampled voltage data of the insulation detection circuit comprises: acquiring switch state information of the insulation detection circuit, wherein the switch state information comprises a closing state of the first switch and a closing state of the second switch; and acquiring the sampling voltage data based on the switch state data.
3. The method of claim 2, wherein obtaining the sampled voltage data based on the switch state data comprises: Responsive to the first switch being closed and the second switch being open, obtaining a first sampling voltage based on a preset sampling frequency; Responsive to the first switch being open and the second switch being closed, obtaining a second sampled voltage based on the preset sampling frequency; the sampled voltage data is determined based on the first sampled voltage and the second sampled voltage.
4. The method of claim 1, wherein filtering the sampled voltage data to obtain the data filtering result comprises: Filtering the sampled voltage data by adopting a digital filtering mode to obtain a filtering result; And carrying out calibration processing on the filtering processing result to obtain the data screening result.
5. A method according to claim 3, wherein performing insulation detection based on the data screening result, the detection result comprising: and responding to the first sampling voltage and the second sampling voltage in the data screening result to be preset values, and determining that the positive electrode insulation state and the negative electrode insulation state are both normal states.
6. A method according to claim 3, wherein performing insulation detection based on the data screening result, the detection result comprising: And responding to the first sampling voltage in the data screening result to be a preset value, wherein the second sampling voltage is larger than the preset value, determining that the positive insulation state corresponding to the insulation detection circuit is an abnormal state, the negative insulation state is a normal state, and determining the first insulation resistance based on a first calculation model corresponding to the insulation detection circuit.
7. A method according to claim 3, wherein performing insulation detection based on the data screening result, the detection result comprising: And in response to the first sampling voltage in the data screening result being greater than a preset value, and the second sampling voltage being the preset value, determining that an anode insulation state corresponding to the insulation detection circuit is a normal state, and a cathode insulation state is an abnormal state, and determining the second insulation resistance based on a second calculation model corresponding to the insulation detection circuit.
8. A method according to claim 3, wherein performing insulation detection based on the data screening result, the detection result comprising: And determining that the positive electrode insulation state and the negative electrode insulation state are abnormal states in response to the first sampling voltage and the second sampling voltage in the data screening result are both larger than preset values, and determining the first insulation resistance and the second insulation resistance based on a third calculation model corresponding to the insulation detection circuit.
9. 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 one of claims 1 to 8.
10. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored executable program, wherein the executable program when run controls a device in which the storage medium is located to perform the method of any one of claims 1 to 8.

Description

Vehicle insulation resistance detection method, vehicle and storage medium Technical Field The embodiment of the application relates to the technical field of detection of battery management systems, in particular to a vehicle insulation resistance detection method, a vehicle and a storage medium. Background In the context of rapid development of the new energy automobile industry, the battery management system and the motor driving system of the electric automobile are used as core components, and monitoring and maintenance of the insulation performance of the electric automobile become critical. The accurate detection of the insulation resistance can ensure the electrical safety of the vehicle, effectively improve the energy utilization efficiency and prevent potential fire risks. With the development of new energy automobile technology, the complexity of the vehicle electrical system is increased, and the existing insulation resistance detection method is difficult to adapt to the complex change, so that the accuracy and reliability of insulation resistance detection are affected. There is currently no good solution to the above problems. Disclosure of Invention The embodiment of the application provides a vehicle insulation resistance detection method, a vehicle and a storage medium, which are used for at least solving the technical problems of low performance detection efficiency and low accuracy of the vehicle insulation resistance in the related technology. According to one aspect of the embodiment of the application, a vehicle insulation resistance detection method is provided, which comprises the steps of obtaining sampling voltage data of an insulation detection circuit, wherein the insulation detection circuit is used for detecting a first insulation resistance between a positive pole of a power battery of a target vehicle and a vehicle shell and a second insulation resistance between a negative pole of the power battery and the vehicle shell, screening the sampling voltage data to obtain a data screening result, conducting insulation detection based on the data screening result to obtain a detection result, determining an anode insulation state and a cathode insulation state corresponding to the insulation detection circuit, and generating a vehicle maintenance instruction of the target vehicle by using the detection result. The insulation detection circuit further comprises a first switch, a second switch and a bridge detection circuit, wherein the first switch is used for controlling the connection state of an anode detection branch in the bridge detection circuit, the second switch is used for controlling the connection state of a cathode detection branch in the bridge detection circuit, the acquisition of sampling voltage data of the insulation detection circuit comprises the acquisition of switching state information of the insulation detection circuit, the switching state information comprises the closing state of the first switch and the closing state of the second switch, and the acquisition of the sampling voltage data is based on the switching state data. Further, obtaining sample voltage data based on the switch state data includes obtaining a first sample voltage based on a preset sample frequency in response to the first switch being closed and the second switch being open, obtaining a second sample voltage based on the preset sample frequency in response to the first switch being open and the second switch being closed, and determining sample voltage data based on the first sample voltage and the second sample voltage. Further, the sampling voltage data is subjected to screening processing to obtain a data screening result, wherein the step of filtering the sampling voltage data in a digital filtering mode to obtain a filtering processing result, and the step of calibrating the filtering processing result to obtain the data screening result. Further, insulation detection is performed based on the data screening result, and the detection result comprises that the positive electrode insulation state and the negative electrode insulation state are determined to be normal states in response to the fact that the first sampling voltage and the second sampling voltage in the data screening result are both preset values. Further, insulation detection is performed based on the data screening result, and the detection result comprises the steps of responding to the fact that a first sampling voltage in the data screening result is a preset value, and a second sampling voltage is larger than the preset value, determining that an anode insulation state corresponding to the insulation detection circuit is an abnormal state, a cathode insulation state is a normal state, and determining a first insulation resistance based on a first calculation model corresponding to the insulation detection circuit. Further, insulation detection is performed based on the data screening result, and the detection