Study on Vehicle Diagnosis Grounded Simulation System of High-Speed Maglev Train

Study on Vehicle Diagnosis Grounded Simulation System of High-Speed Maglev Train
　　The diagnosis system on the Maglev train plays an important role in guaranteeing safe and efficient operation of the maglev train. Forasmuch, it is very important to build up grounded simulation system before studying on-board diagnosis system in maglev train and realizing its localization. On one side it can provide a test-platform for the CAN interface of local magnetic lifter electrical and electronic components, on the other it may act as a testing system which is used to study and understand the key techniques of on-board diagnosis system. Therefore, it has to be developed.
　　On the background of German high-speed maglev train on Shanghai maglev demonstration line, aiming at the localization of maglev train, the architecture design and comprehensive function of on-board diagnosis system are analyzed and studied, the signals flow and data flow of vehicle diagnosis system are analyzed, meanwhile the working process of vehicle diagnosis system is also introduced.A design plan on how to build up on-board diagnosis grounded simulation system, hardware structure and communication method of CAN network are introduced. The designs of CAN nodes and magnetic lifter CAN simulation display screen are given. The application layer protocols of nodes are customized according to the CAN technical specification and international standard.The Visual C++6.0 advanced programming language is used to develop the programming of control-and-monitor terminal of master computer of on-board diagnosis grounded simulation system.
　　The design process and communication flow chart of program are introduced, and the method how to set acceptance filter of nodes is also given in detail.A network of on-board diagnosis grounded simulation system is built up, debugged and tested. The testing methods, testing contents and testing results are given, at the same time the existing problems are analyzed as well. The serial interface simulation results and on-line monitor suggest that this system can basically realize the function of magnetic lifter on-board diagnosis system, can simulate the operational principle and process. The testing results also confirm the feasibility, reliability of this monitoring software and high quality versus price ratio of CAN bus. CAN bus is very suitable for on-board magnetic lifter application.Several key problems concerned with on-board diagnosis system of high-speed train are explored at last, including the selection of architecture, the choice of fieldbus, diagnosis computer and operating system. It is expected that exploring these problems can provide references to the process of localization.