Abstract
In this paper, we design a control system of an electric power steering applying the H_∞ control theory to evaluate responses of the steering system in frequency domain. Furthermore, in order to improve transfer characteristics of the steering angle from the self aligning torque, the self aligning torque generated from the vehicle model is considered as disturbance to the steering system on the controller design. By carrying out simulations, it is verified that the controller designed is effective to improve stability of not only the steering system but also the vehicle model to inputs of the steering torque or the self aligning torque. Also simulation results show the robustness of the controller designed to variation of the vehicle speed and the mass.
