应用CAN总线车辆辅助电气系统控制器设计分析

Design and Analysis of the Auxiliary Electrical System Controller of Vehicle Based on CAN Bus

采用CAN总线技术对电传动车辆辅助电气系统进行设计,克服传统布置形式的弊端。基于整车分布式控制系统结构特点,对影响辅助电气控制系统的从控制器和辅助电气控制器进行分析设计;对CAN总线网络协议进行设计,主要包括数据的成帧协议和传输协议两方面;基于以上分析设计,搭建试验平台,对系统控制的时间特性和可靠性进行分析。结果可知:辅助电气总线时钟周期选择20ms,总线的占用率不到45%,可以保证总线数据传输的安全可靠;辅助电气控制系统时间特性的实测结果与计算之间吻合度较高,与示波器测试误差控制在0.05ms;系统冗余设计的可靠性较高,100ms左右即可完成总线切换;系统具有较高的可靠性,可以作为实际设计的参考。

The auxiliary electrical system of the electric drive vehicle has more internal equipment.TheCAN bus technology is used to modularize and distribute the control structure of the electric drives system.Based on the structural characteristics of the distributed control system of the whole vehicle,the alternate controller and the auxiliary electrical controller which affect the auxiliary electrical control system are analyzed and designed.The network protocol of CAN bus is designed which including data framing protocol and transmission protocol.Based on the above analysis design,a test platform is built to analyze the time characteristics and reliability of system control.The result shows that the clock cycle of auxiliary electric bus is selected for 20 ms,and the bus occupancy rate is less than 45%,which can ensure the safe and reliable bus data transmission.The time difference between the measured results of the auxiliary electrical control system and the calculation is high,and the test error of the oscilloscope is controlled at 0.05 ms.The reliability of the system redundancy design is high,and the bus switching can be completed in about 100 ms.The system has high reliability and can be used as a reference for actual design.