The Application Of Multi-Interface MVB Netcard On Locomotive Status Monitoring And Fault Diagnosis System

By means of monitoring and diagnosing the key components of the locomotive,the locomotive status monitoring and fault diagnosis system can find out and determine the fault components,record the fault process in time,alarm the driver and crew and point out the troubleshooting methods or to take emergency measures through the cab display.For the locomotive status monitoring and fault diagnosis system needs to transmit large amount of information about equipments control and passenger service,a large capacity,high-speed information transmission system is needed to ensure real-time information transmission and reliability.TCN(Train Communication Network) came into being in such circumstances.It includes two-layer buses:Wired Train Bus(WTB) and Multifunction Vehicle Bus(MVB).This paper focused on the current development status and trend of locomotive status monitoring and fault diagnosing system,improved the communication network of the original system,that is using the MVB bus instead of the CAN bus.It mainly completed the following work:1.Rounded with the composition and function of the locomotive status monitoring and fault diagnosis system,firstly analyzed the original working mechanism,and pointed out the defects of the CAN bus when used as vehicle bus,then led to the research topic of this paper,that is making the application of MVB network in the locomotive supervisory system.On the basis of ensuring the compatibility with the original system,described the improvement concept,the improved working mechanism and network composition.2.This design used SOPC(System on Programmable Chip) technology,achieved all the netcard functions on one piece of FPGA,having higher intensity and lower cost. The multi-interface MVB netcard design mainly consisted of two parts,the second class device and the forth class device.The second class device design not only implemented the MVB process data and message data function,but also included two different kinds of communication interfaces-the Serial Peripheral Interface(SPI) and Universal Asynchronous Receiver Transmitter device(UART),making the connection with different equipments conveniently;the forth class device was the MVB bus administrator,it had the same hardware design with the second class device,but different bottom configuration and application design to realize the periodic polling in the network.3.For the MVB bus administrator needed to poll the equipments in the network according to the periodic list,and the periodic list was the necessary condition for ensuring the real-time communication as well.Therefore,on the analysis of the data transmission features,this paper studied the logic port allocation and the periodic list design deeply,and validated the reasonableness of the design through the experiments.4.Then,preceded the network test in the lab to verify whether the whole system could work normally in MVB network.Based on the practical application needs of the locomotive supervisory system,analyzed different connect modes of MVB,and preceded the Electrical Middle Distance test,gave the test results,showed the normal communication of the system,and validated the correctness of the design.Finally,summarized the work had been done,and pointed out the facets needed to improve and the direction for the future work.