基于CAN总线的电动汽车中继站研究

Electric vehicle relay station based on CAN bus

针对纯电动汽车电机控制器开发环境大多独立于整车系统造成的两者间通信报文和传输速率不相同的问题,对CAN总线多节点分布技术在纯电动汽车通信中的应用进行了研究,提出了一种基于瑞萨SH72A2单片机以及CAN总线技术的通信中继站设计方法。在分析电机控制器和整车报文的基础上,推导了通信报文转换的格式,建立了中继站的硬件模型和总体功能结构,并结合现场总线多节点通信技术的相关理论,提出了中继站与电机控制器和整车控制器的双通道CAN通信方法,实现了基于J1939协议的CAN通信中继站的软件设计。在搭建的CAN通信平台和整车控制平台上,分别进行了报文转换和CAN通信稳定性实验。研究结果表明,该中继站能够实现数据采集和报文转换功能,双通道CAN通信响应迅速、可靠性高。

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.