关键词: 新能源汽车；高压互锁；故障诊断；控制信号

Abstract: With the rapid development of new energy vehicle, high-pressure safety has received great attention, how to do high voltage electricity not exposed and ensure the safe driving of vehicle is very important. In view of the high voltage safety, the paper mainly introduces the high voltage interlock, which is the protection measure of the high voltage interlock. The design lines of the high voltage interlock are basically the same in different types of vehicles, the control signal is different. Taking BYD Qin EV as an example, analyzing the transmission of high-voltage mutual lock lines and controlling signals, and the fault mechanism and troubleshooting method of high-voltage interlock are further analyzed. It can be used for reference to understand the fault analysis of high voltage interlock and high voltage interlock.

Key words: New energy vehicle; High voltage interlock; Fault diagnosis; Control signal