Design Of Central Control Unit In Subway Train Fault Diagnosis System

With the increasement of the subway train speed, the train's reliability and security become more and more important. The subway train fault diagnosis system is one of intelligent systems. When subway train is in trouble during movement, people can achieve effective diagnosis through the man-machine direct dialogue in short time. The subway train fault diagnosis system has become an essential part of the modern subway.The present paper takes"Guangzhou subway NO.1 line homemade reform"as the research background. The design of central control unit is realized in this paper. The central control unit has three parts. One is the CPU board with 32-bit microprocessor and VME bus controller. The other is the HDLC correspondence board with HDLC correspondence controller. The last one is the CAN bus correspondence board with CAN bus controller. The detailed research in the hardware and the software of these three parts are conducted which aim at the characteristic of the subway train.First, the expert system is adopted which is suitable to the subway train fault diagnose. Then the malfunction data collect interface unit is designed which has 32-bit microprocessor and VME bus controller based on the expert system. And then, according to the characteristic of intelligent terminal interface unit, the malfunction data collect interface unit is designed which has CAN bus controller based on the research of the data form that the intelligent terminal interface unit dispatched. Finally, according to the ATO's characteristic, the malfunction data display interface unit is designed which has HDLC communication controller. The paper can fully confirm that the project is correct by the test about correspondence board performance.