Analysis And Realization Of Hybrid EMU Traction Convertor Monitoring System Based On Network

The EMU has the characteristics of security, reliability and rapidity, so it is a hot choice of high density passenger carriage and ease the transport pressure. Traction converter as the core vehicle equipment, monitoring parameters is very important during the stage of development, debugging, loading and later maintenance. This thesis based on the’Development of Hybrid EMU’that is supported by National Science and Technology 12th Five-Year Plan project design and implement a monitoring system based on Hybrid EMU traction converter system. The monitoring system based on network architecture of CAN bus and Ethernet communication could realize status monitoring, parameter testing, and fault diagnosis function on the traction converter.Firstly, this paper simply introduces developing significance of Hybrid EMU and its network topology, analysis rail traffic monitoring, illustrates the function and significance of monitoring system that used in Hybrid EMU traction converter.Then, according to the characteristics of Hybrid EMU traction converter, this paper makes the monitoring system demand analysis, in order to meet the demand of debugging, it raise performance requirements of the monitoring system. Combined with the demand analysis and performance requirements, this paper use DSP28335 as the main processor, PC monitoring interface use Lab VIEW software to develop,the function of monitoring system based on network traffic.Next, this paper introduces detailedly about the CAN bus scheduling theory, analyzes the Deadline Monotonic (DM) scheduling model, bus load rate, real-time model and scheduling indicators. The paper analyzes node message features in the traction converter, calculates messages scheduling, builds Matlab/Stateflow simulation model verify CAN bus real-time model, and verifies the feasibility of DM scheduling by experiment.After that, this paper analysis principle of Binary Decision Diagram (BDD) fault tree analysis, and introduces qualitative analysis and quantitative analysis based on BDD algorithm, summarizes the fault tree analysis logical reasoning process,this method is applied to traction converters fault diagnos in this paper, establishs fault model do analysis and calculation work, realizes fault diagnosis function.Finally, analyzes four-layer model of Ethernet TCP/IP protocol, formulates Ethernet communication protocol for monitoring system, the underlying monitoring board realizes UDP traffic by programming, PC monitoring interface is designed by LabVIEW programming language, and completes the communication debugging between bottom and PC monitoring interface.In summary, this paper completes design and development of the traction converter monitoring system based on the network, the field test in CAN bus monitoring, LabVIEW monitoring interface and fault diagnosis experiment verifies the design of the monitoring system runs stablity, has the features of control, monitoring, and fault diagnosis, it meets Hybrid EMU traction converter monitoring demands.