Safety circuit and control method of a sil4 safety level rail vehicle door controller

Abstract

The invention discloses a safety circuit of a SIL4 safety level rail vehicle gate controller. The safety circuit of the SIL4 safety level rail vehicle gate controller comprises a safety signal input processing circuit, a dynamic frequency wave generation circuit, an optocoupler isolation driving circuit, a safety signal logic calculation circuit based on SIL4, a transformer circuit and a driving circuit, wherein the output end of the safety signal input processing circuit and the output end of the dynamic frequency wave generation circuit are separately connected with the input end of the optocoupler isolation driving circuit, the output end of the optocoupler isolation driving circuit is connected with the input end of the safety signal logic calculation circuit based on the SIL4, the output end of the safety signal logic calculation circuit based on the SIL4 is connected with the input end of the transformer circuit, and the output end of the transformer circuit is connected with thedriving circuit. The safety circuit of the SIL4 safety level rail vehicle gate controller further discloses a control method of the safety circuit of the SIL4 safety level rail vehicle gate controller, according to the safety circuit of the SIL4 safety level rail vehicle gate controller, a gate is prevented from accidentally being opened, and the SIL4 level requirements can be met.

Description

Technical field [0001] The invention belongs to the technical field of rail transit vehicle doors, and specifically relates to a safety circuit of a SIL4 safety class rail vehicle door controller and a control method thereof. Background technique [0002] Rail vehicle door systems usually use unlocking components such as motors or electromagnets to drive the doors to unlock, and mechanical drive components such as motors or cylinders to drive the door leaf to open and close. Take motor drive as an example. The motor is controlled by a door controller installed inside the door system. The door controller receives vehicle control signals and controls the motor to drive door unlocking and door leaf movement. As the control unit of the door system, the door controller has higher requirements for reliability and safety. [0003] With the rapid development of rail transit in the Chinese market in recent years, the failures caused by the door system have become increasingly prominent, an...

AI Technical Summary

Problems solved by technology

After years of actual operation, it has been proved that the safety level of this scheme is relatively high. However, due to restrictive factors such as the design structure of the safety relay scheme circuit and the safety level of components, this scheme cannot meet the SIL4 level safety requirements alone.

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