Patent ID: 8517130

Claim:
A drive unit for a movable member, comprising: the movable member being rotatably mounted to rotate in one direction of rotation and in an opposite direction of rotation to rotate between a first end of a rotation range of the movable member and a second end of the rotation range to adjust aerodynamic characteristics of a vehicle, an electric rotation motor operatively connected to the movable member so that operation of the electric rotation motor rotates the movable member between the first and second ends of the rotation range; a preventing device contacted by the movable member rotating in the one direction to prevent the movable member from rotating beyond the first end of the rotation range and contacted by the movable member rotating in the opposite direction to prevent the movable member from rotating beyond the second end of the rotation range; and a controlling device supplying electric power to the electric motor for a reference time to rotate the movable member between the first and second ends, the controlling device being configured to change the reference time and supply the electric power to the electric motor for a time different than the reference time based on an external factor affecting an operating speed of the movable member.