Redundant Speed and Distance Measuring System at Train Head and End Based on CAN Bus

Objective Data interconnection and interaction are realized through ATP (automatic train protection) system in most of the existing train speed and distance measuring technologies. However, the implementation process is complicated, and the train positioning is failure prone caused by timing sequence problems. It is necessary to explore a more reliable and effective technical method to realize real-time and accurate train positioning. Method The function realization flows of the speed and distance measuring system at single end of the train, and the redundant speed and distance measuring system at both ends of the train based on CAN (control LAN) bus are introduced. The differences of the data processing flow between the above two systems are further compared. Calculation models for train running speed and distance are established in terms of the redundant speed and distance measuring system at both ends of the train. On this basis, the train speed and distance correction models are also established considering the train length factors and the delay in data transmission and processing process between the train ends. A train operation simulation system is built to simulate the fault condition of the train head-end positioning equipment, and analyze the validity of the data under the above fault condition after switching between redundant speed and distance measuring systems at train head-end and tail-end. Result & Conclusion The system can continuously output valid speed and distance measuring data in the event of train head-end positioning equipment failure, accurately describing the train speed and position information.