基于网络演算的CAN总线延迟上界计算方法  

Method for calculating delay bound of CAN bus by network calculus

作　　者：陈克伟[1] 宋小庆[1] 廖自力[1] 

机构地区：[1]装甲兵工程学院控制工程系,北京100072

出　　处：《计算机工程与设计》2013年第3期804-808,共5页Computer Engineering and Design

摘　　要：以网络演算为理论工具,提出一种基于网络演算的CAN总线延迟上界计算方法。参考漏桶模型,建立了CAN总线的到达曲线模型,参考速率延迟模型,建立了CAN总线的服务曲线模型,推导得出了CAN总线延迟上界的计算式。通过仿真实验得到了各个数据帧的到达曲线、服务曲线和延迟上界,验证了所提方法的有效性,该方法具有输入参数少、计算量小和求解速度快的特点。与相关研究比较分析,该方法综合考虑了总线通信速率和各个数据帧的优先级、产生周期和数据长度对延迟上界的影响,因而具有更好的适应性和通用性,可以为CAN总线系统分析、设计与优化提供理论依据。Network calculus （NC） is used as the theoretical tool, and a new method for calculating the delay bound of CAN bus based on NC is proposed. The arrival curve, the service curve and the delay bound of every data frame are obtained by simulation experiment, and the proposed method is validated and has many virtues which include less input parameters, low computational complexity, giving the solution rapidly. Compared with related research work, the affect of the bus rate, priority, circle, data length of every data frame on the delay bound are considered generally in the proposed model, so it has good adaptability and generality and can provide theoretical basis for analysis, design and optimization of CAN bus.

关 键 词：CAN总线 网络演算 到达曲线 服务曲线 延迟上界 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]