The signal system, as one of the basic facilities of the subway transportation, is an important means to realize the operation of trains with centralized control and a kind of important equipment to secure the safety of the operation of train, the increase of transportation efficiency and the improvement of management of the operation of the subway system. An advanced signal system can not only guarantee the safety of the train in operation, but also increase the efficiency of the operation of trains to the maximum, shorten the interval between two trains and increase the punctuality rate and speed of trains so as to realize an automatic control of trains and for the automatic running of trains, which is beneficial to reducing the cost for construction and operation and providing the safe, fast and quality service for passengers.
At present, the composition, the mode of control and the functions of the signal systems of Line1.Line2.Line13 and Line Ba-Tong are generally the same.
The signal system of Beijing Subway includes the automatic train monitoring system/centralized dispatch, automatic train protection system and the electricity concentration system, etc.
The automatic train monitoring system is aimed to, with the use of technological equipment, realizing automatic monitoring and control of the operation of trains and complete the plan-designated mission of transporting passengers. The major functions of automatic train monitoring include:
- To control trains’ entering and leaving a certain depot on route and returning at terminals and the whereabouts of the trains operation between two fixed stations according to the route, time of arrival and leaving and the destination set in the train operational plan and the dispatch plan.
- To provide the dispatch staff with information concerning the operation of the train, including the position of the train, the interval between different operation, the display of arriving/leaving signals, the direction of bypass, the locking of entrance way, the mode of closing adopted and the result of order execution.
- Train identification and report of the number of the train.
- To adjust the operation of trains to make them run punctually and with equal intervals.
- To collect statistics concerning indexes of the operation of trains.
- To produce the operational plan and record the real operation.
The automatic train protection system and the electricity concentration interlocking system are important equipment to secure safe operation of trains by preventing train collision and derailing. This system has the following functions:
- To control the selection of the entrance way for trains and interlock; to check the occupation of trains, to control the safety-securing interval between trains according to the rule of closing so as to avoid the grave accidents like head-tail collision, head-head collision and sideway collision.
- To send operational instructions to trains to prevent speed-limit exceeding.
