Patent ID: 7127848

Claim:
A control apparatus for a movable member movable between an opening position in which an opening of a frame is opened and a closing position in which said opening of said frame is closed, comprising: a drive motor for actuating said movable member; a switch which is operated to actuate said drive motor; a position detecting device, wherein the position detection device counts a predetermined parameter related to rotation of said drive motor and detects a position of said movable member based on a count number of said parameter; a control section, which controls said drive motor for actuating said movable member based on an operation of said switch, and said position of said movable member is adapted to be detected by said position detecting device, wherein the control section executes the steps of: rotating said drive motor reversely for reversing a moving direction of said movable member when movement of said movable member is obstructed by a foreign matter disposed between said movable member and said opening of said frame while said movable member is moving toward said closing position; setting a home position of said movable member in the control section by setting said count number to a predetermined value when said movable member is placed in a predetermined position; and performing setting of said home position again in the control section when a reverse action of said movable member has been carried out, because said movement of said movable member is obstructed by said foreign matter disposed between said movable member and said opening, a specified number of times; and an abnormality detecting device for determining that an abnormality has occurred when the reverse action of said movable member is not carried out within a specified period of time, whereby, when said abnormality detecting device determines said abnormality has occurred, said control section does not perform the step of setting again of said home position in the control section.