Research On Real-time And Reliability Of Train Control Network

With the rapid developmet of the embedded computer control technology and fieldbus technology,the control of modern trains are changing from the centralized control of the direct digital process system to a Web-based distributed control system. The main bus standard which used to trains control are CAN, LonWorks, WorldFIP, ARCNET and TCN.With the increasing task of the train control network and the product's special operations requirements for train control system , there are higher demands for real-time and reliability.This thesis focus on real-time and reliability of train control network, mainly to complete the following tasks:First of all,it introduces several typical fieldbus applied to train, and a comparative analysis for these bus on their characteristics and applicability has been finished.Second, it studies on the train communication network of key technologies and carries out a detailed analysis. it analyzes the technologies of polling cycle used in variables communications,tour events and key events used in broadcast of orginal source of address and information communication and explains how they ensure the real-time and liability of information from the perspective of variables and information. It carries out furthur research on how to meet the requirements of ensuring the real-time of period information in train communication netwrok and strict time limits in emergent non-period communication. It uses the example of MVB to study on the ways of how to ensure real-time of all period information and build up the communication model to analyse the real-time of MVB communication.Third, the study on CRH5's train control network control structure. The redundancy design for both WTB and MVB has been done. Analysis of the reliability block diagram, fault tree analysis and failure mode, effects and analysis of the importance of the train control network fault diagnosis and control of the train network to improve the reliability of the application.Finally, the summary of the article has been written and the work needing to carry on next has been forecast.