Efficient processing method for insulation alarm fault problem of electric vehicle

Abstract

The invention discloses an efficient processing method for an insulation alarm fault problem of an electric vehicle. The efficient processing method comprises the following steps: A, performing resistance detection on a power battery system by adopting insulation detection equipment; b, judging a detection result, and when the insulation resistance value is lower than a threshold value, determining that a problem exists in the power battery system; when the insulation resistance value is above the threshold value, determining that a problem exists in the three-in-one controller, the motor, theelectric controller, the compressor and the steering motor; c, when it is detected that all the devices have no problems, carrying out insulation detection on the main loop positive electrode and themain loop negative electrode and the charging positive electrode and the charging negative electrode respectively; d, judging a detection result, and when the display resistance value is smaller thana threshold value, determining that a problem exists in the part smaller than the threshold value; otherwise, needing to disassembling the high-voltage connector and the internal loop for further judgment, further narrowing the range, and in this way, caryring out deep troubleshooting till the root cause is found out. The invention aims to provide an efficient processing method for an insulationalarm fault problem of an electric vehicle.

Description

technical field [0001] The invention belongs to the field of motor vehicles, and in particular relates to an efficient processing method for an electric vehicle insulation alarm failure problem. Background technique [0002] Most of the output voltages of pure electric vehicle power batteries are between DC / 72V and DC / 600V or even higher. The safe voltage of the human body generally refers to the voltage that does not directly cause death or disability, and continuous contact is allowed under normal environmental conditions. The "safety extra low voltage" is DC / 36V. The DC voltage range output by the electric vehicle power battery has far exceeded the safe voltage. Therefore, the national electric vehicle safety requirements standard puts forward clear requirements for personnel's electric shock protection, including the minimum requirements for insulation resistance value. According to Article 6.2.2 of GB / T18384.3-2001, the minimum instantaneous insulation resistance in t...

AI Technical Summary

Problems solved by technology

If there is an insulation alarm problem, generally speaking, technicians will check the fault reported by the diagnostic platform, but based on the fault, it is still impossible to find the insulation failure point quickly and effectively, and it is also possible to check all high-voltage devices one by one. This method is used to deal with the problem. At present, the commonly used insulation problem troubleshooting method usually adopts the method of reading the fault code of the diagnostic platform to confirm the insulation problem, and then randomly eliminates the insulation of the high-voltage device to troubleshoot the insulation problem. The insulation of the high-voltage devices is tested one by one. Big, long chain, time-consuming and costly, and low efficiency, which is not conducive to solving the problem quickly

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