关键词: 亏电；休眠；唤醒；错误帧；故障树分析

Abstract: This article focuses on the fault of abnormal power loss in a new energy passenger car after the power supply is off. Using the fault tree analysis method, exclusion method, comparative testing method, etc, and the static current consumption of the vehicle after power off is taken as the starting point for multidimensional research and analysis. It not only explores the sleep and wake up strategy of the electronic control unit on the vehicle, but also deeply analyzes the formation mechanism of controller area network bus error frames based, ultimately we locates the cause of the fault, and provides targeted improvement and optimization. Finally, the abnormal power loss fault is successfully eliminated and the vehicle energy consumption is reduced.

Key words: power loss; sleep; wake up; error frame; fault tree analysis