Design of CBTC and ATP/TD Integrated On-board System

Abstract

Objective In response to the continuously increasing passenger demands, Chongqing Rail Transit Line 2 requires signaling system upgrading and renovation for the previously launched Jiaochangkou-Xinshancun Interval. Based on recommendations from industry experts, it is proposed to implement a coexisting through-operation of CBTC (communication-based train control system) with ATP (automatic train protection) / TD (train position detection) systems. Method A technical parameter comparison is conducted between the two schemes with independent and integrated on-board systems. A design scheme for an integrated on-board system compatible with both CBTC and ATP/TD systems is presented. Consideration is given to the installation space of existing vehicle on-board equipment, and efforts are made to control the scale of on-board equipment modification. This includes retaining the position detection cabinet and ATP unit receiving cabinet, introducing a new VOBC (vehicle on-board controller) cabinet to replace the original ATP unit control cabinet, and redistributing on-board equipment system functionalities. The driving modes of ATP/TD systems are redesigned, eliminating the original ground ATP signal availability mode and restricted manual operation mode. The design of the integrated on-board system and vehicle interface is emphasized considering system functionality. Additionally, a station is renovated as a driving mode switching station in the transition area between CBTC and ATP/TD system segments. The ATP/TD system is adopted for the later launched Xinshancun-Yudong Interval, while the CBTC system is employed for Jiaochangkou-Xinshancun Interval. Result & Conclusion Research results show that, the integrated on-board system scheme facilitates smooth signaling system transition between CBTC and ATP/TD for trains, enabling through-operation with relatively low technical risks and investment costs for implementation.

Keywords

• chongqing rail transit line 2
• integrated on-board system
• scheme design