Patent ID: 7374014

Claim:
An electric power steering assist controlling apparatus for a vehicle, comprising: a steering torque controlling unit controlling an electric power assisted steering motor to control a steering torque on a steering wheel depending on an operator's steering operation to reduce an operator's power required to operate the steering wheel; a braking force estimating unit for estimating braking forces to be imposed on wheels of the vehicle; a right and left braking force difference estimating unit for estimating difference between the braking forces to be imposed on the right and left wheels each estimated by the braking forces estimating unit; wherein when an anti-skid control is executed during braking on a road where the frictional coefficient differs from right to left, the difference in braking force between right and left wheels is generated by the anti-skid control thereby generating a yaw moment that causes the vehicle to be deflected toward a higher road frictional coefficient side; an assist steering torque providing unit for providing a counter-steering assist steering torque which assists an operator's counter steering operation on the steering wheel for the steering torque controlling unit in a direction to reduce the yaw moment of the vehicle generated due to the difference in braking force between right and left wheels on the basis of the difference in braking force between right and left wheels estimated by the right and left braking force difference estimating unit; a vehicle stability controlling unit for controlling a stability of the vehicle depending on a traveling state of the vehicle; and wherein the assist steering torgue providing unit is arranged so as to inhibit provision of the assist steering torgue when the stability of the vehicle is controlled by the vehicle stability controlling unit.