An Optimization Method for TCMS and ATC Time Synchronization Control

By optimizing the time synchronization control logic of the TCMS system, and by comparing the heartbeat and cached variables of the ATC system with preset judgment conditions, the misjudgment problem of time synchronization between the TCMS system and the ATC system was solved, thus realizing the reliability and stability of the TCMS system clock, which is suitable for the rail transit industry.

CN115623028BActive Publication Date: 2026-01-30NANJING RAIL TRANSIT EQUIPMENT TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202211099548.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-09
Publication Date
2026-01-30
Estimated Expiration
2042-09-09

AI Technical Summary

Technical Problem

The existing TCMS system and ATC time synchronization control method have bugs, which cause the TCMS system time parameters to be incorrect or chaotic, and are completely controlled by the vehicle ATC time, resulting in incorrect synchronization when the ATC time is abnormal.

Method used

The time synchronization control logic has been optimized. By comparing the ATC heartbeat with the cached variables in the TCMS system and combining preset judgment conditions to determine the validity of the ATC information and the difference between the TCMS system's internal clock and the ATC time, the synchronization between the TCMS system's internal clock and the ATC time is controlled, avoiding misjudgment and abnormal synchronization.

Benefits of technology

Without increasing costs or hardware, the reliability and stability of the TCMS system clock are improved, ensuring the consistency of time for all onboard subsystems, facilitating train control and troubleshooting, and making it suitable for the rail transit industry.

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Abstract

This invention discloses an optimized method for TCMS and ATC time synchronization control. When ATC communication is normal, the time parameter information sent by ATC is valid, the ATP bypass switch is not in the bypass position, the time difference between the TCMS internal clock and the standard time sent by the ATC during normal communication exceeds 2 seconds, and the ATC heartbeat read in the current cycle differs from the called ATC heartbeat cache variable, and the ATC heartbeat read in the previous cycle also differs from the called ATC heartbeat cache variable, the TCMS internal clock is synchronized with the ATC time when all the above conditions are met. This method solves the problem of TCMS misinterpreting a change in ATC heartbeat when the gateway device is powered on again while the ATC heartbeat is stopped, causing the TCMS time to synchronize with the ATC time at the moment before the gateway power failure. This method has strong versatility and improves the reliability and stability of TCMS system clock control.
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