Insulation detecting method and device for electric automobile

Abstract

The invention discloses an insulation detecting method and an insulation detecting device for an electric automobile. The insulation resistance of the whole vehicle is detected by combining the resistance voltage dividing method with the cycle detection method, and the whole detecting device comprises an analog quantity acquisition part and a relay array switching part, wherein a detect switch is arranged between the analog quantity acquisition part and the relay array switching part; when the switch is closed, the insulation detecting starts; the left side of the relay array switching part is connected with an electrical system corresponding to relay arrays, each array of the relay array switching part is provided with a changeover switch respectively; by switching corresponding changeover switches, the detecting device can judge and position the specific electric leakage point, and then calculate the insulation resistance of the point through corresponding algorithm. The method and the device have the advantages of adopting the resistance voltage dividing method and the cycle detection method to detect the insulation resistance of the whole vehicle, and having the characteristics of stable performance, no alternating-current signal injected into the system, long service life, and capability of positioning the insulation fault point and the like.

Description

Technical field: [0001] The invention relates to a method and a device for detecting the performance of an automobile, in particular to a method and a device for detecting the insulation of an electric vehicle. It is mainly used for insulation detection of electric vehicles. Background technique: [0002] Conventional cars use fuel or natural gas as their power source, and rarely have high-voltage insulation problems, while electric cars are a complex mechatronic product, which involves strong electric and insulating active batteries, motors, chargers, auxiliary batteries and Charging devices, and other devices powered by power batteries, due to the harsh working conditions on the vehicle, vibration, corrosion of acid and alkali gases, changes in temperature and humidity, may cause rapid aging or even insulation of power cables and other insulating materials. Damage will greatly reduce the insulation strength of the equipment, endangering personal and electrical safety. ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to address the shortcomings of the existing electric vehicle insulation detection, and propose a method that can effectively solve the problem that the electric vehicle cannot control the insulation status of the whole vehicle in real time, and at the same time avoid the AC signal injection caused by other current insulation detection methods. Or the insulation performance of the whole vehicle will be reduced when the insulation device is used, and the insulation fault point cannot be located, and the insulation detection device of the electric vehicle with complex structure and other deficiencies

This enables the location of insulation faults

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