Patent ID: 7196486
Filing Date: 2007-03-27
Classification: H02H

Abstract:
1. An apparatus for detecting an obstacle to a power regulated window to be opened and closed by a motor comprising: current detecting means for detecting a momentary value of load current flowing through the motor; pulse-signal outputting means for outputting a pulse signal having a longer pulse interval correspondingly to retardation of rotating speed of the motor, said pulse-signal outputting means comprising: average-value generating means for generating and outputting an average value, the average value having a rate-of-change of an amplitude that is variable in response to a time constant, wherein the time constant has been set to have a time length-corresponding to a period of the pulse signal, the average value being a reference value for judging when the load current value of the motor exceeds a predetermined value of over-load current; and comparing means for judging whether or not the momentary value detected by the current detecting means exceeds the average value outputted by average-value generating means by comparing the momentary value with the average value, wherein existence of a bitten obstacle is detected by a judging result of the comparing means.