区域计算机联锁CAN实时性改进及仿真分析  

Improvement and Simulation Analysis of CAN Real-time Performance for Regional Computer Interlocking

作　　者：王瑞峰[1] 刘涛[1] 孙平[2] 郝铁军[3] 

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070 [2]沈阳铁路局辽西工程建设指挥部,辽宁锦州121000 [3]沈阳铁路局长春电务段,长春130000

出　　处：《计算机工程》2015年第3期298-302,共5页Computer Engineering

基　　金：甘肃省自然科学基金资助项目(1310RJZA046)

摘　　要：区域计算机联锁系统采用调度监督加集中联锁的方式实现,其安全通信网通过物理介质的延伸进行区域性控制,随着大量相邻站点并入系统,对安全协议的实时性要求也逐渐增高。为此,针对该系统使用的控制局域网络(CAN)总线协议,对站间安全通信网CAN总线的传输时延进行分析,采用动态优先级算法对实时性进行改进。仿真结果表明,通过改变负载,相比于标准CAN,改进的CAN总线协议降低了节点的最大时延,能够保证不同类型节点的实时性,可满足区域计算机联锁系统对网络通信的要求。Regional computer interlocking system is implemented with the method of dispatching supervision and centralized interlocking. The extension of physical media is used for regional control of its security communication network. The real-time requirement of security protocol is gradually increasing with the large number of adjacent sites incorporated into the system. This paper analyzes the transmission delay of Controller Area Network（CAN）bus（used for existing regional computer interlocking system communication network）between stations,and proposes a dynamic priority algorithm to improve the real-time performance. The simulation result shows that the improved CAN bus protocol can reduce the maximum delay between nodes by changing the load. In addition,it can ensure the real-time performance of different types of nodes,and can meet the requirement of regional computer interlocking system for network communication.

关 键 词：区域计算机联锁 安全通信网 控制局域网络(CAN)总线 实时性 动态优先级算法 时延 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术]