Modeling and Verification of CTCS-3 On-board Equipment Based on Colored Petri Net

Abstract

The on-board control system is the kernel subsystem of the CTCS-3 train control system which is the key to ensure the safety of train operation. According to the complexity of CTCS-3 train control system, first of all, this paper analyzes the mode conversion rules of the on-board equipment of CTCS-3, establishes the model conversion scenario (MTCPN) model based on Colored Petri Net, and introduces the use branch in the CPN Tools. The sequential logic ASK-CTL formula and the non-standard state space query method formally verify the constructed MTCPN model, and the verification result is true, indicating that the constructed MTCPN model satisfies the rules of the CTCS-3 Train Control System Requirements Specification (SRS). The mode conversion function conforms to the on-board device mode conversion process, and through the verification result, the mode conversion scene of the on-board device is analyzed to have deadlock-free and transferability.