Self-learning-pattern-based method and system for preventing hand clamping during door closing of motor

Abstract

The invention provides a self-learning-pattern-based method and system for preventing hand clamping during door closing of a motor. The system comprises a microprogrammed control unit (MCU), a control circuit, a motor, a sampling circuit and an analog/digital (A/D) conversion circuit, wherein the sampling circuit acquires a loop voltage value of a loop of the motor; and the MCU receives the loop voltage value by the aid of the A/D conversion circuit and controls the motor by the aid of the control circuit. According to the method, in the door opening process, the maximum loop voltage value of the motor is acquired to be used as a locked-rotor valve value, in the door closing process, the loop voltage value of the motor is acquired and is compared with the locked-rotor valve value, whether a locked-rotor condition occurs is judged, if the locked-rotor condition occurs, the motor stops door closing, and if the locked-rotor condition does not occur, the motor closes a door continuously. With the method and the system, the problem of inconsistent locked-rotor valve values due to differences of motor consistency, performance change after long-time usage and the like can be effectively solved, the locked-rotor detection sensitivity is greatly improved, and personal safety is really guaranteed.

Description

technical field [0001] The invention relates to a hand-pinch prevention method and system for electric door closing, in particular, it relates to a hand-pinch prevention method and system for electric door closing based on a self-learning mode. Background technique [0002] On the bus automatic door coin machine, when the motor closes the door after swiping the card to take out the liner, if people accidentally reach in, they may be pinched by the motor when the door is forced to close, and there may be a danger of disability in severe cases. There are two main solutions to the existing motor switch door anti-blocking, one is to add a fuse in the main circuit of the power supply, the insurance value is 1.5-2.0 times the normal current value, this solution basically cannot effectively protect personal safety , can only play a role in protecting the motor. The other is to connect a sampling resistor in series in the motor load circuit, use the MCU to collect the circuit volta...

AI Technical Summary

Problems solved by technology

There are two main solutions to the existing motor switch door anti-blocking, one is to add a fuse in the main circuit of the power supply, the insurance value is 1.5-2.0 times the normal current value, this solution basically cannot effectively protect personal safety , can only play a role in protecting the motor

The other is to connect a sampling resistor in series in the motor load circuit, use the MCU to collect the circuit voltage, and turn off the motor when it reaches the voltage threshold that needs to be protected; although this solution can play a certain role, there are still problems. Obviously, the outstanding problems are mainly manifested as: 1) Due to the existence of motor consistency, service life and installation differences, the stall threshold of each motor is inconsistent, causing some frequent malfunctions, and some have already stalled 2) If the sampling threshold is increased to avoid the occurrence of misoperation, it will increase the occurrence of stalls but cannot be detected, and the purpose of personal safety protection will not be achieved.

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