Patent ID: 7878512

Claim:
An alignment changing control device for controlling driving of an electric actuator which changes alignment angle of wheels of a vehicle, the electric actuator being mounted on the vehicle and exposed to outside air, the alignment changing control device comprising: a motor drive section which adjusts electrical power supplied to a motor of the electric actuator according to an operation command from outside and, when receiving an operation inhibiting signal, limits or stops supplying the electrical power to the motor; a motor temperature estimating section for calculating an estimated temperature of the motor from at least a current supplied to the motor and a vehicle atmosphere temperature, which is obtained by correcting an outside air temperature by a vehicle speed, based on heat balance relationship; and a comparator which transmits the operation inhibiting signal to the motor drive section when the estimated temperature of the motor calculated by the motor temperature estimating section is higher than a predetermined temperature, which is equal to or lower than an operation allowable temperature of the motor, wherein the motor temperature estimating section calculates the estimated temperature of the motor by using the outside air temperature corrected in proportion to the square of the vehicle speed.