关键词: 纯电动汽车；商用车；绝缘检测；定位技术

Abstract: The working condition of battery electric commercial vehicle has complex road conditions and harsh working conditions, which leads to the acceleration of the wear rate of the vehicle electrical equipment, resulting in the continuous decline of the insulation resistance of the electrical equipment, and if not handled in time, there may be safety hazards or cause major safety accidents. Based on the principle of insulation fault detection, this paper analyzes and explores the application of an insulation detection and positioning technology, and a set of low-voltage signal transmission system consisting of insulation detector, current transmitter, current transformer and insulation fault locator is connected and installed in each high-voltage circuit of the vehicle. Through the real-time transmission of the system current signal, the fault loop is quickly and accurately located and the fault location is locked. This technology provides a fast, efficient and accurate solution for the investigation of faulty vehicles in the aftermarket.

Key words: Battery electric vehicle; Commercial vehicle; Insulation detection; Location technology