Optimization of Urban Rail Transit Signaling System Functions Based on Alternate Day Depot Return Operation Mode

Abstract

Objective In the alternate day depot return operation mode, trains either stay overnight on the mainline or run continuously day and night. The relevant functions of existing urban rail transit signaling system can no longer meet the requirements, therefore needing an optimization. Method Starting with an analysis of the functional optimization needs of signaling system, the optimization scenarios and contents for the on-board ATC (automatic train control) subsystem, the trackside ATC subsystem, the ATS (automatic train supervision) subsystem, and the signaling equipment self-inspection/monitoring are elaborated in detail. Result & Conclusion For the alternate day depot return operation mode, the on-board ATC subsystem is enhanced with train position memory function, allowing overnight trains on the mainline to start directly upon powered on in the controlled mode of signaling system. By adjusting buffer zone settings, the convergence protection envelope is optimized for non-communication trains staying overnight on the mainline, to avoid impacting the operation of other mainline trains. The optimized ATS subsystem supports both the automatic schedule matching after online timetable changes and the cross-day operation schedules. The functional optimization of signaling equipment self-inspection work enables the extension of signaling system equipment self-inspection or reboot cycle, meeting the requirements for long-term continuous operation. The series of signaling system functional optimizations enhance the availability of signaling systems and improve the service levels.

Keywords

• urban rail transit
• signaling system
• alternate day depot return operation
• stabling on mainline
• functional optimization