关键词: 电动卡车；直流充电；故障诊断；通信；绝缘电阻

Abstract: With the development of low-carbon energy in recent years, especially in the transportation industry, heavy electric trucks are becoming more and more popular. However, the normal charging of heavy electric trucks directly affects the daily operation of customers. At first, this paper introduces the composition of dc charging system, guiding principle and control strategy and sequence, on this basis, according to abnormal direct current (DC) charging problem, from the communication between the vehicle and charging pile, an abnormal connections and vehicle high voltage insulation problem is discussed in three aspects, and combining with the actual work vehicle debugging, maintenance process appeared some fault condition, and carries on the analysis. Finally, the methods and opinions of DC charging fault diagnosis and maintenance of heavy electric truck are proposed, hoping to provide help for users and maintenance personnel of heavy electric truck.

Key words: Electric truck; DC charging; Fault diagnosis; Communication; Insulation resistance