Patent ID: 8583328

Claim:
In a vehicle rear wheel toe angle control device that is configured to change rear wheel toe angles individually by actuating a linear electric actuator provided on each rear wheel, a reference position calibrating method for calibrating a reference position designated as an operational position of the electric actuators when the rear wheel toe angles are set at a neutral value, the method comprising: a symmetric toe angle setting step wherein operational positions of the electric actuators achieved when the rear wheel toe angles are symmetric to each other are set as a symmetric toe angle position by actuating at least one of the electric actuators in a toe out or toe in direction while the vehicle is traveling until a front wheel steering angle becomes zero and the vehicle is traveling straight; and a reference position setting step wherein operational positions of the electric actuators achieved when an axial force acting upon each electric actuator agrees with a standard axial force corresponding to the neutral value of the rear wheel toe angles is set as the reference position by actuating the two electric actuators from the symmetric toe angle position in a toe in or toe out direction by a same amount until the axial force acting on each electric actuator becomes equal to the standard axial force.