Research purposes: The railway block technology has developed from the fixed block, the quasi-moving block to the moving block, and the train tracking interval is getting smaller and smaller, which improves the railway transportation efficiency. However, the existing blocking technologies are based on the idea that the train ahead is stationary. Even if the moving block technology with the highest driving efficiency is adopted, the tracking interval between the behind train and the front train at least includes an emergency braking distance and a protection distance. However, the running speed of the existing high-speed train has already exceeded 300 km/h, and the emergency braking distance at high speed is very long, resulting in a long tracking distance between the behind train and the front train. In order to further shorten the train tracking distance and improve the transportation efficiency, it is necessary to break through the inherent concept of the existing blocking technology, and study and design the train control principle and key technologies of the train control system. On the basis of studying the existing blocking technology, this paper puts forward the key technologies and train control strategy of the train control system based on virtual coupling.
Research conclusions: (1) In the train control system based on virtual grouping, the front train and the behind train establish train-to-train communication, and the behind train calculates the dynamic safety tracking distance according to the real-time speed, position and other state information of the front train, thus greatly shortening the tracking distance of the front and behind trains and improving the transportation efficiency. (2) The train control system based on virtual coupling needs to have key technologies such as train-to-train communication, train integrity check, accurate train positioning, dynamic safe tracking distance calculation, automatic tracking operation, in order to realize safe and efficient train tracking operation. (3) The tracking strategy of the front and behind trains is put forward. Based on the real-time state of the front and behind trains, the behind trains automatically accelerate, decelerate or run at a constant speed, and the tracking state of the front and behind trains is adjusted in real time to realize virtual grouping. (4) The research results can provide reference for the research on the principle and key technology of train control system in the future.