| 摘要 |
<p>PROBLEM TO BE SOLVED: To simplify a door lock mechanism and improve its reliability by detecting the reduction in motor current after its excess of a prescribed locked motor current recognition value, judging the door to be completely closed, and stropping the motor. SOLUTION: A resistance R is set in the drive side of a motor M for driving in the door closing direction and a motor current is taken into a CPU 10 by converted into a voltage and converted from AC to DC. When the motor M is normally rotated by turning on an operation switch SW2 after a half-latched half-door state so that the door is closed into a completely closed state, the door is pushed against the body, exceeding load is applied thereon, the motor current is rapidly increased, and then the rotation is completely constrained so as to decrease it gradually. The detection of a rush current is avoided by a timer, the motor current is sampled at prescribed intervals, and after exceeding a prescribed locked motor current recognition value, when it decreases continuously in a prescribed number of the sampling, the door is judged to be completely closed, and the motor M is stopped its normal rotation and starred reverse rotation.</p> |
