Patent ID: 6320341
Filing Date: 2001-11-20
Classification: B60N

Abstract:
A control device for a movable member comprising:a DC motor for moving the movable member;a pulse shaping circuit for shaping a ripple pulse indicative of a rotational number of the DC motor;a clock generating circuit providing a clock signal according to the ripple pulse;a filter for eliminating noise in a current wave or a voltage wave of the DC motor depending on a cut-off frequency which is varied by the clock signal;wherein the pulse shaping circuit shapes the ripple pulse according to the current wave or the voltage wave of the DC motor;position calculation means for calculating a present position of the movable member according to the ripple pulse;memory means for storing a desired position as a first position; andcontrol means for controlling a drive of the DC motor to move the movable member from other than the first position to the first position.