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Research on All Electric Computer Interlocking System for Urban Transit

Compared with the traditional relay based interface, the all-electric execution unit has many advantages, such as flexible configuration, space saving, easy to commission and install, and has become one of the development trends of computer interlocking system. In view of the demands of urban rail transit and CBTC system, TYJL-IIIE type all-electric computer interlocking system is modified based on TYJL-III type system. The safety design is targeted on the four key links including system switching principle, safety communication board, object control unit and all-electric execution unit, the system safety is ensured by various safety measures such as safety communication protocol, double two out of two, positive and negative driving code check and fault relay protection are adopted in the software and hardware. In addition, the all-electronic computer interlocking system implements an intelligent maintenance, and analog state information from wayside equipments is added into the monitoring content, which enriches the convenience of monitoring and maintenance.