Research And Design On Station Extension Of City Rail Transit ATS System

Currently, communication-based train control system was used in more and more urban rail traffic signal system. Compared with the traditional train control system, signaling system based on the CBTC has a higher speed, shorter interval, greater transport capacity. The condition for CBTC system to complete its main functions is relatively high, but sometimes these conditions may fail to, for example during the transition to the running speed of the design, there is no standard configuration or with line signal system compatible with the vehicle signal equipment of train and wayside communication fault, and the central communication fault, automotive equipment failures and other conditions. At this time, the CBTC backup mode is required to start the job. Under the background of CBTC backup mode,the extension of ATS station should play more roles, and the design and study of ATS station expansio in this paper under the background of CBTC backup mode.Firstly, the structure of CATS and LATS was studied, and their function was analyzed.Secondly, The necessity of CBTC backup mode, the control mode of ATS and the working mechanism of ATS in backup mode are emphatically studied. Then,the work of the backup mode, the automatic control mode of the station and the different working principle of the station under the manual control of the backup mode are summarized. Then, the TMT(Train Monitoring and Tracking) and ARS(Automatic Route Setting) functions of local ATS under the backup mode are mainly analyzed. The monitoring principle of the point ATP and the interlocking modes on different backup levels is analyzed according to different backup levels in the TMT functions of local ATS. The work flow of route alignment is emphasized in the ARS functions of local ATS.Then, according to the function analysis, the software design of ATS station is carried out based on the Metro Line 1.of LanZhou which is simulated. The typical four functional modules of the software are designed fist, including the terminal display module, the ATS operation module, the simulation train running module, data management and communication module. The terminal display module uses the window partition technology, divides the different function area. Using ACCESS2003 database to design the relevant data structure,including the static data and the dynamic data of each signal point, the alert and the operation data.Then, the software data structure and the local TMT and local ARS, communication interface software design are mainly designed and studied. The functions closely related to monitor and track like the train window and the track of the data structure design, trainnumber method definition, tracking and step into the mode in local TMT software is analyzed and designed. The route alignment and the station data structure and the process of route management are designed and studied in the local ARS function.Finally, the functional safety of the switch control function and control level switch function are analyzed through FMEA(failure mode and effect analysis) and corresponding failure mode and ultimate failure effect obtained. At the end, the two switching modes of the ATS station central control to station control is simulated.