轨道交通安全计算机中倒机单元的设计  

Design of Switch Unit in Safety Computer of Railway Transportation

作　　者：边庆[1] 单冬[1,2] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]北京交大微联科技有限公司,北京100195

出　　处：《计算机技术与发展》2012年第9期153-156,共4页Computer Technology and Development

基　　金：铁道部科技研究开发计划项目(2011X009-E)

摘　　要：安全计算机被广泛应用于轨道交通信号系统中,其中倒机单元有效提高了安全计算机的可靠性。研究了二乘二取二安全计算机结构,介绍了基于通信的倒机方式,制定了安全通信协议。该方式硬件上利用FPGA实现,使整个设计紧凑、灵活、稳定且高速;软件上,讨论了主备状态的确定,分析了倒机基本原则和单系的状态转移。具有该倒机方式的安全计算机,已在多种轨道交通信号系统中得到了应用,应用结果表明,本方案切实可用,能够满足系统高可靠性的要求。Safety computers are widely used in railway signaling systems. Switch unit improves the reliability of safety computers effectively. The structure of double 2-vote-2 safety computer is researched. It introduces a design scheme of switch unit based on communication. The realization of switch unit is using FPGA in hardware, makes the whole design tighter, more flexible, more steady and high- speed. In software, the methods of selecting the host are discussed. The basic principle of switching and shift of working status are ana- lyzed. Safety computers including the switch unit have been applied in several railway signaling systems. The application results show the scheme is practical and applicable to the work, and meets the needs of high reliability.

关 键 词：安全计算机 倒机单元 二乘二取二 通信 

分 类 号：TP399[自动化与计算机技术—计算机应用技术] U231[自动化与计算机技术—计算机科学与技术]