Patent ID: 7259532

Claim:
A power window apparatus with a function of pinching detection comprising: a motor for opening/closing a window via a window drive mechanism during driving; a pulse generator outputting a pulse signal in accordance with the rotation of the motor; a switch unit for manually opening/closing the window by generating a switch signal; and a control unit for producing a control signal of the motor corresponding to the pulse signal and the switch signal, the power window apparatus with a function of pinching detection executing: determination whether pinching is generated in the window when the window is closed by the switch unit; a pinch avoiding procedure when the pinching is determined using the control unit; and no pinching determination in the period from a motor start to a stabilized point of the motor rotating speed assumed as an activation/cancellation time period, wherein the control unit monitors changes in motor rotating speed from the motor start so as to detect a peak of the motor rotating speed, and when the peak of the motor rotating speed is detected, the control unit measures a period of time Ta, through which the decreasing rate of the motor rotating speed becomes maximal after the peak detection from the motor start, so as to establish the activation/cancellation time period by adding a time Tb that is a first predetermined numerical-fold door vibration period to the time Ta, and wherein when the peak of the motor rotating speed is not detected, the time that the changing rate of the motor rotating speed arrives at a predetermined value or an input ratio of the motor arrives at a predetermined value is assumed to be the finish time of the activation/cancellation time period.