关键词: 车辆故障；驱动电机；传感器；故障排除

Abstract: With the government's strong support and policy drive for the new energy vehicle industry, the popularity rate of new energy vehicles has increased significantly, and the corresponding rise in the failure rate of new energy vehicles has been accompanied. In this paper, the abnormal faults in the startup and acceleration process of 2018 Geely Emgrand EV450 vehicle are analyzed and successfully eliminated. The fault performance is that the vehicle is powered on normally, but it cannot run normally when accelerating, and then the system fault indicator is lit and powered off. By reading and analyzing the fault codes of the vehicle controller and the drive motor controller, and combining the structure and working principle of the drive motor position sensor, it is determined that the fault originates from the cosine signal circuit. The maintenance team follows the principle of simple to complex, and gradually checks the rotating transformer, sine/cosine signal circuit and excitation signal circuit, and finally locates and replaces the damaged drive motor position sensor. After the fault is solved, the vehicle returns to normal operation, which verifies the validity of diagnosis and elimination steps. The research not only solves the specific faults, but also provides valuable experience in fault diagnosis and elimination of electric vehicles, which has important reference value in the field of electric vehicle maintenance.

Key words: vehicle fault; drive motor; sensor; troubleshooting