Modeling and Simulation of Automotive Electric Power Steering System

The working principle and constitution of electric power steering system (EPS) was introduced. The mathematic model was established and the state equation was listed. The influence factors and the corresponding solutions were analyzed. The close-loop control strategies of PID and PWM were adopted to control the target current of the motor for EPS. The simulations were made based on MATLAB/Simulink tools. The results indicated that the steering wheel with EPS system was easy to control and to return promptly with perfect steering feel.The model for EPS was precise, simple and utility and could afford further study on optimum design and control, and system debugging. It was also helpful to research the robust control research for EPS.