Patent ID: 6972536

Claim:
A closure member control device connected to an external power supply, wherein the closure member control device comprising: a closure member that is movable between a first mechanical limit position at a closing travel end of the closure member and a second mechanical limit position at an opening travel end of the closure member; a drive motor that drives the closure member to move the closure member between the first mechanical limit position and the second mechanical limit position; a position detecting means for: incrementing and decrementing a count value based on rotation of the drive motor; and detecting an operational position of the closure member between the first mechanical limit position and the second mechanical limit position based on the count value; a storage device that stores position information of the closure member, which indicates the operational position of the closure member obtained by the position detecting means; a position information judging means for determining whether the position information stored in the storage device is erroneous when a voltage of the power supply falls below a predetermined voltage and thereafter returns to the predetermined voltage; a motor operational state determining means for determining whether the drive motor is turned on at a point in time just before the voltage of the power supply falls below the predetermined voltage; and a positional deviation determining means for determining whether a deviation of the detected operational position of the closure member exists, wherein the positional deviation determining means determines that the deviation of the detected operational position of the closure member exists upon satisfaction of a first set of the following conditions: the position information judging means determines that the position information stored in the storage device is non-erroneous; and the motor operational state determining means determines that the drive motor is turned on at the point in time just before the voltage of the power supply falls below the predetermined voltage.