Patent ID: 6382345
Filing Date: 2002-05-07
Classification: B62D

Abstract:
An electric power steering system which is adapted to control an electric motor on the basis of a target electric current determined in accordance with a steering torque applied to an operation member and apply a driving force from the electric motor to a steering mechanism for steering assist, the electric power steering system comprising:steering torque sensor for detecting the steering torque; target current setting circuit for determining the target electric current in accordance with the steering torque detected by the steering torque sensor on the basis of an assist characteristic indicative of a relationship between the steering torque and the target electric current; motor controlling circuit for controlling the electric motor for driving thereof on the basis of the target electric current determined by the target current setting circuit; traveling state judging circuit for judging whether or not a motor vehicle equipped with the electric power steering system is in a slalom traveling state; and assist characteristic modifying circuit for offsetting the assist characteristic from an initial characteristic level when the traveling state judging circuit judges that the motor vehicle is in the slalom traveling state.