Disclosed herein is a turning motion assistance device for an
electric vehicle, adapted to effectively reduce tire wear of the vehicle while at the same time ensuring appropriate turning response.A turning motion assistance device for an
electric vehicle including steered wheels 101 and 102, driving wheels 103 and 104, motors 105 and 106, and a
steering wheel 108 for controlling a
steering angle of the steered wheels 101 and 102, includes a target wheel
slip angle calculating unit 151 for calculating a target wheel
slip angle from the
steering angle, a vehicle state quantity
detector for detecting vehicle state quantities, an actual vehicle-body
slip angle calculating unit 152 for calculating an actual vehicle-body slip angle from the vehicle state quantities, an actual wheel slip angle calculating unit 153 for calculating an actual wheel slip angle from the actual vehicle-body slip angle and the
steering angle, a yawing moment requirement calculating unit 154 for calculating a yawing moment requirement from a difference between the target wheel slip angle and the actual wheel slip angle, and a torque correction data calculating unit 155 for calculating an amount of torque correction for generating the yawing moment required; in this assistance device, a torque that has been corrected in accordance with the amount of torque correction is applied from the motors 105 and 106 to the driving wheels 103 and 104, respectively.