On the Design of Electric Power Steering Control Unit

Abstract

in modern cars, hydraulic power steering (HPS) is continuously substituted by the electric power steering (EPS). Electric Power Steering (EPS) has important significance in improving the auto's dynamic and static performances. This paper deals with the design of the microcontroller based EPS Control Unit. First, the principle and structure of EPS are discussed. Then the characteristics of EPS system are analyzed, including the typical power curves which deal the relationship of the assist torque and the steering wheel torque. Finally, the designed and the experiment results of the EPS Control Unit are discussed. The experiment results show that the actual current of the motor follows the target current validates the designed assist characteristic.