LI Jifen, CHEN Yangsheng, ZHANG Wei

 

(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

 

 

Abstract: Aiming at solving different communication messages and transmission rate between electric vehicle motor drive and vehicle system, multinode distribution technology of CAN bus for electric vehicle communication was researched, and a design of CAN communication relay station based on Renesas SH72A2 integrated controller was proposed. On basis of analyzing messages of motor drive and vehicle system, the communication format of message conversion was set up, and functional structure of the relay station with hardware circuit was built. Combining fieldbus communication scheme, the two channels CAN communication between the motor drive and electric vehicle system was presented to realize software design of the relay station based on J1939 protocol. The functions of messages conversion and the reliable of CAN communication were tested in the laboratory. The results indicate that the relay station can realtimely transfer messages and convert messages′ format based on CAN bus between two nodes, and it has fast response and high reliability.

 

Key words: electric vehicle; CAN bus; relay station; Renesas SH72A2