A control system and method applied to a train door

By employing permanent magnet synchronous motors and magnetic encoders in the train door control system, combined with dead-zone compensation control algorithms, the problem of susceptibility to interference in motor encoding signals was solved, achieving high-precision and reliable door control, reducing the failure rate, and ensuring the stability of train operation.

CN117386258BActive Publication Date: 2026-04-21NANJING KANGNI ELECTRONICS TECH +1
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Patent Information

Application Number
CN202311618366.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-30
Publication Date
2026-04-21
Estimated Expiration
2043-11-30

AI Technical Summary

Technical Problem

The coded signals of existing rail transit vehicle door motors are susceptible to interference when installed over long distances, affecting the smoothness and accuracy of door control, leading to door closing failures and impacting train operation.

Method used

By employing a permanent magnet synchronous motor and a magnetic encoder, combined with a dead-zone compensation control algorithm, and improving the accuracy of motor position information acquisition through CAN communication, and performing current compensation through a current detection module, high-precision control of the permanent magnet synchronous motor is achieved.

Benefits of technology

This improves the precision and reliability of door control, reduces the door closing failure rate, and ensures the stability and safety of train operation.

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Abstract

This invention discloses a control system for train doors, comprising a door controller, a permanent magnet synchronous motor, and door control signals. The door controller includes an EMI circuit, a power supply module, a safety circuit, an input port circuit, a CPU1, a motor drive module, and a current detection module. The permanent magnet synchronous motor includes motor windings, a magnetic encoder detection magnet, and a magnetic encoder. The magnetic encoder internally includes a magnetic encoder chip, a CPU2, and a CAN interface chip. The door control signals include an open signal, a close signal, a lock-in signal, an emergency unlock signal, a zero-speed signal, and an enable signal. The magnetic encoder significantly improves the motor's control accuracy and solves the accuracy and interference issues of Hall effect sensors. Through the FOC dead-zone compensation control algorithm, low-speed, high-torque operation is achieved, solving problems such as unstable door operation under special conditions, anti-pinch during opening and closing, and unreliable door closing. This improves door control performance, reduces vehicle operation risks, and ensures reliable vehicle operation.
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