What is the signal of urban rail transit?

Urban rail transit signal system is the key system to ensure the safety of train operation, realize the modernization of traffic command and train operation and improve transportation efficiency. The signal system determines the direction of the train by controlling the turnout, and indicates whether the driver is going or stopping by controlling the color of the signal. The driver is only responsible for refueling, braking and pressing the emergency stop.

The signal system of urban rail transit usually consists of two parts: the automatic train control system (ATC) and the signal control system of the depot. It is used for train route control, train interval control, dispatching command, information management, equipment status monitoring and maintenance management, thus forming an efficient integrated automation system.

system classification

1, fixed block ATC system

The fixed block ATC system refers to the automatic block mode based on the traditional track circuit. The interval division is determined by traction calculation according to the line conditions, and once it is delineated, it is fixed. The train takes the block partition as the minimum running interval, and ATC system realizes the automatic control of train operation according to this characteristic. Fixed block ATC system can be divided into speed code mode and target distance code mode.

2. Moving block ATC system

ATC system in moving block mode usually uses wireless communication, ground cross induction loop, waveguide and other media to transmit information to train control vehicle-mounted equipment. According to the maximum allowable speed of the train, the current stop position, route and other information, the safe interval distance of the train is calculated, and the information is updated circularly to ensure that the train continuously receives instant information.

Refer to the above content: Baidu Encyclopedia-Urban Rail Transit Signal System