改进型CAN总线协议的实时性研究  

Analysis for Real-time Performance of Improved CAN Protocol

作　　者：刘承智[1] 丁国良[1] 原亮[1] 陈家文[1] 

机构地区：[1]军械工程学院计算机工程系,河北石家庄050003

出　　处：《计算机技术与发展》2012年第7期81-84,共4页Computer Technology and Development

基　　金：国防重点实验室资助项目(9140C8702020803)

摘　　要：目前,CAN总线广泛应用于实时控制系统,其实时性对系统的安全性和可靠性产生很大影响。为了提高CAN总线的实时性,文中系统分析了CAN总线协议特点,提出减少标识符、增加数据位等改进措施,降低其数据帧自身开销,对CAN协议进行改进。最后对改进型协议的帧利用率进行了分析,并通过将改进型协议应用于一个消息集,得到了消息集的最坏响应时间。实验结果表明,改进型协议在提高帧利用率的同时,缩短了消息的最坏响应时间,从而提高了CAN总线通信的实时性。As CAN （ Controller Area Network） is increasingly used in real-time control systems, the real-time performance of CAN bus has a fatal effect on safety and dependency of systems. In this paper,based on the systematic analysis of CAN protocol,provide an im- proved CAN protocol which can reduce the number of identifiers and extend data bytes. Analyze utilization rate of frame of the improved protocol and apply it to a message set to calculate the worst case response time. The results of experiments indicate that,the improved CAN protocol can provide a higher utilization rate of frame while reducing the worst-case response time,thereby improving the real-time communication based on CAN bus.

关 键 词：实时控制系统 CAN协议 标准帧 标识符 帧利用率 最坏响应时间 

分 类 号：TP919[自动化与计算机技术]