上海轨道交通3、4号线改造后的数据通信子系统可靠性优化方案

Data Communication Subsystem Reliability Optimization Scheme of Upgraded Shanghai Rail Transit Line 3 and Line 4

[目的]在上海轨道交通3、4号线信号系统大修改造项目现有DCS(数据通信子系统)向双制式四网络演进的过程中,存在轨旁DCS单点故障引起单个车-地通信网络失效的隐患,有必要通过调整通信网络结构来优化DCS的可靠性。[方法]基于列车自主运行系统的结构及业务,分析DCS网络结构,并确定影响DCS可靠性的关键节点与链路。从设备层和协议层分别对DCS可靠性优化方案进行阐述。在样板段对优化后的方案进行现场动车测试,以评估DCS的可靠性。[结果及结论]优化后的DCS可靠性高,优化方案能显著增强信号系统的整体性能。

[Objective]During the evolution of existing DCS(data communication subsystem)towards a dual-mode four-network system in the major signaling system renovation project of Shanghai Rail Transit Line 3 and Line 4,there is a hidden risk that the trackside DCS single-point fault may cause the failure of individual vehicle-wayside communication network.It is needed to optimize DCS reliability through adjusting the communication network structure.[Method]Based on TACS(train autonomous circumambulate system)structure and operation context,the DCS network structure is analyzed to identify key nodes and links affecting DCS reliability.The optimization scheme for DCS reliability is elaborated from both device and protocol layers.Field tests of operating trains on a sample section in the optimized scheme are conducted to evaluate the reliability of DCS.[Result&Conclusion]The optimized DCS demonstrates high reliability,it significantly enhances the overall performance of signaling system.