Gate Control Unit of Rail Transit Screen Door Control System

Abstract

The invention discloses a door control unit of a rail transit shielding door control system. The unit comprises a central processing unit, an anti-clamping detection module, a direct current motor, a door control electromagnetic valve and a power supply system. The anti-clamping detection module comprises an infrared detection head, a limit switch and a motor current detection circuit. The motor current detection circuit is connected with the direct current motor, and a digital output port of the central processing unit is connected with the door control electromagnetic valve. Various onsite bus communication ports are reserved, execution stability of the door control unit (DCU) is improved, a multiple anti-clamping detection technology is adopted to sample motor current and information of the limit switch and the infrared detection head and detect whether foreign matters exist in the middle of a door body, and passenger passing safety is greatly improved. An overvoltage / overcurrent protection circuit is arranged at the position of a digital quantity output port wire of the DCU to prevent overvoltage or overcurrent from burning a control circuit of the front end execution device like the door control electromagnetic valve and further guarantee execution stability and reliability of the door control unit.

Description

technical field [0001] The invention relates to a door control unit of a control system for a rail transit screen door. Background technique [0002] The rail transit screen door system is a high-tech product integrating electronics, communication, machinery, architecture and aesthetics. It is an essential facility for modern subways, light rails and BRT projects. Separated from the platform waiting room. The screen door control system is an important part of the screen door system. The screen door control system is mainly composed of central control panel PSC, local control panel PSL, door control unit DCU, communication unit, portable maintenance device PTE and other equipment. [0003] The door control unit DCU is at the core of the entire screen door control system, and its main function is to control the opening and closing of the rail transit screen door. As the terminal execution unit of the screen door control system, its control accuracy, stability, safety and mai...

AI Technical Summary

Problems solved by technology

[0004] At present, the door control unit of domestic and foreign screen door control systems has the following problems: (1) The data transmission channel between the door control unit DCU and the central control panel PSC is fixed through the Profi-Bus bus, and various field bus communication interfaces are not reserved. Once the preset bus interface is not applicable or fails, normal communication cannot be realized, and the execution stability of the door control unit DCU is poor; (2) The foreign door control unit DCU is not equipped with multiple anti-pinch functions. It is very dangerous when the torque monitoring fails or passengers enter between the screen door and the train, and the safety of passengers passing is poor; (3) The digital output interface line of the traditional door control unit DCU does not have overvoltage / overcurrent protection function, it is easy to overvoltage or overcurrent burn out the front-end execution equipment such as the gate control solenoid valve, and the stability and reliability of the gate control unit execution cannot be guaranteed

Images