TH14248A - Elevator door control system - Google Patents

Abstract

The elevator door control system includes at least one door safety device for detecting when the elevator doors are in a safe position. The elevator control circuit outputs door open/close commands, and the door control circuit controls the opening/closing of the doors based on the open/close commands from the elevator control circuit. The door return request output to the elevator control circuit is based on the operating signal of the door safety device. The door control circuit outputs a door return request to the elevator control circuit based on the received operating signal from the door safety device. While the doors are closed based on the door closing command from the elevator control circuit, the door speed command format is switched from brake to open speed format. Subsequently, the door speed command format is switched from brake to open speed format when an open door command is received from the elevator control circuit instead of the closing command.

Claims (4)

1. The elevator door control system includes at least one door protection device to detect whether the elevator door is safe, an elevator control circuit for outputting door open/close commands, and a door control circuit to control the opening/closing of the doors based on the door open/close commands from the elevator control circuit. It also provides a door return request output to the elevator control circuit upon receiving an activation signal from the door protection device while the door is about to close, based on the door closing speed command pattern from the elevator control circuit. This process then switches the door closing speed command pattern from the closing speed command pattern to the braking pattern, and finally switches it back to the opening speed command pattern upon receiving an opening command from the elevator control circuit. Finally, it establishes a door closing speed command pattern that maintains a predetermined speed until an opening command is not generated by the elevator control circuit within a specified time frame. This process begins when the door closing speed command pattern switches from the closing speed command pattern to the braking pattern and ends when the door reaches a predetermined low speed. 2. Elevator door control devices under claim 1, where the door protection device uses one of the following types of door protection switches, optical detection devices, ultrasonic detection devices, infrared detection devices, and thermoelectric detection devices. 3. The elevator door control device, as per claim 1, where the door control circuit outputs a communication signal to the elevator control circuit, representing the door protection device, which is the operational signal received when a door return request is output to the elevator control circuit. 4. The elevator door control system comprises at least one door protection device for generating operating signals, an elevator control circuit for outputting door open/close commands, and a door opening/closing control unit based on the door open/close commands from the elevator control circuit. It also provides a door return request output to the elevator control circuit upon receiving an operating signal from the door protection device. This door opening/closing control unit generates a constant door closing speed command when no door opening command is received by the elevator control circuit within a specified time, and switches to a braking mode when an operating signal is detected. The specified time refers to the period between the time the door closing speed command is switched to braking mode and the door reaches a predetermined low speed.