Power window system with control unit for detecting foreign object caught in car window

Abstract

The present invention provides a power window system, by which it is possible to reliably detect that a foreign object is caught in a car window even during the period from the time of starting of a motor to the time when stable operation of the window is reached, and also, it is possible to minimize erroneous detection. The power window system of the present invention comprises a pulse generator for generating repeated pulses in response to rotation of a motor, and a control unit for judging that a foreign object is caught in the window. The control unit divides the period of operation into three periods to match the characteristics during the starting of the power window system, i.e. a first period from the starting of the motor to the initiation of upward or downward movement of the window, a second period to the time point when the window reaches and maintains stable operation, and a third period after the second period. In the first and the second periods, one cycle immediately before the repeated pulses is compared with the next half cycle. In the third period, a half cycle immediately before is compared with the next half cycle to judge whether a foreign object is caught in the window or not.

Dependencies are inferred from the claim text.