Patent ID: 8997919
Filing Date: 2015-04-07
Classification: B60T,B60W,B62D

Abstract:
1. 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 a difference between the braking forces to be imposed on the right and left wheels each estimated by the braking forces estimating unit; wherein when the braking forces are applied to the right and left wheels of the vehicle on a road where the frictional coefficient differs from right to left, the difference in braking force between right and left wheels is generated, thereby generating a yaw moment that causes the vehicle to be deflected toward a higher road frictional coefficient side; and 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 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, wherein the assist steering torque providing unit adds the counter-steering assist steering torque to the steering torque controlled by the steering torque controlling unit so that the steering wheel is operated in a direction to reduce the yaw moment of the vehicle generated due to the difference in braking force between right and left wheels.