基于分组的CAN总线容错优先级分配策略  

Fault-Tolerant Priority Assignment Algorithm Based on Classification of CAN

作　　者：刘承智[1] 丁国良[1] 陈家文[1] 谢方方[1] 

机构地区：[1]军械工程学院计算机工程系,石家庄050003

出　　处：《计算机测量与控制》2012年第12期3321-3324,共4页Computer Measurement &Control

基　　金：国防重点实验室资助项目(9140C8702020803):电磁干扰环境下SOPC系统的自适应防护方法研究

摘　　要：电磁干扰(EMI)可能造成CAN总线传输错误,影响CAN总线通信的实时性和可靠性;提出一种基于分组的容错优先级分配策略,旨在提高电磁干扰下CAN总线通信的实时性和可靠性;该策略将消息集按照关键性消息和一般性消息进行分组,并搜索分组后消息子集的容错优先级分配顺序;在总线速率为125kbit/s,每秒平均错误数量为10个的条件下进行实验;实验结果表明,该策略可以有效降低关键性消息子集的最糟糕截止期失效概率(WCDFP),提高CAN总线通信的实时性和可靠性。Abstract.- Electromagnetic interference （ EMI ） may cause the CAN bus transmission errors, and affect the real--time and reliability of the CAN bus communication. This paper presents a fault--tolerant priority assignment algorithm based on classification, aiming to improve the reliability and real time of the CAN bus communication under EMI. The algorithm groups the messages into key messages subset and general messages subset, and then searches the fault--tolerant priority assignment order for the subsets. Experimental conditions were the bus speed of 125 kbit/s and average number of errors for the 10 per second. The results show that this algorithm can effectively reduce the worst case deadline failure probability of key messages subset, and improve real--time and reliability of CAN bus communication.

关 键 词：CAN总线 电磁干扰 实时性 可靠性 分组 容错 

分 类 号：TP336[自动化与计算机技术—计算机系统结构]