WINDOW OPENING AND CLOSING APPARATUS

摘要

A rotational speed sensor (29) generates pulses having a period proportional to the speed of a motor, and a pulse period calculator section (32) calculates the period of the pulses. A jamming determination section (36) calculates the motor load based on the pulse period and determines that an object is jammed when the load exceeds a predetermined threshold. Once it has been judged than an object is jammed, a drive control section (40) stops the motor, then controls the motor for reverse rotation, thereby releasing the object. A door opening and closing detection section (34) further detects the opening or closing operation of a door which is one disturbance factor. If the door is opened or closed, an inhibit control section (38) inhibits jamming judgment for a predetermined period of time thereafter. This prevents an incorrect judgment due to the opening or closing of the door.