An Efficient Treatment Method for Electric Vehicle Insulation Alarm Fault Problem

Abstract

The invention discloses an efficient treatment method for the insulation alarm fault problem of an electric vehicle, comprising the following steps: A. using insulation detection equipment to detect the resistance value of the power battery system; B. judging the detection result, when the insulation resistance value is lower than Threshold, it is determined that the problem exists inside the power battery system; when the insulation resistance is above the threshold, it is determined that the problem exists in the three-in-one controller, motor and electronic control, compressor and steering motor; C. When the above equipment is detected If there is no problem, conduct separate insulation tests on the main circuit positive and main circuit negative, charging positive and charging negative; D. Judging the test results, when the displayed resistance value is less than the threshold, it is determined that there is a problem with the part smaller than the threshold; otherwise, it needs to be disassembled The high-voltage connector and the internal circuit can be further judged, and the scope can be further narrowed. In this way, the investigation can be carried out until the root cause is found. The purpose of the present invention is to provide an efficient treatment method for the insulation alarm fault problem of electric vehicles.

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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