Power window device with safety device

摘要

A safety control power window device which reliably detects nipping of a finger by a window and sash and which is little influenced by variations of motor characteristics of the motor used as a drive source of the power window device. The window position and a thrust pressure acting on the rotary shaft of the motor providing the force for opening and closing the window are detected. Reference pressures for detecting nipping are set according to the window position detected. By comparing the detected pressure and the reference pressures, nipping by the window is detected. Since nipping and the window position are not detected using the drive current of the motor, accurate safety control is realized, eliminating influences caused by variations of the characteristics of the motor.