Design and Simulation for Steer-by-Wire System Based on Fuzzy-PID

By eliminating the mechanical connection between the steering wheel and the wheels, the steer-by-wire system is completely out of the traditional variety of restrictions. The steering gear ratio of the vehicle can be designed freely according to demand, and good steering characteristics will obtain. This paper applies Fuzzy-PID controller, uses the target torque and the actual torque of the motor as input, and uses fuzzy control strategy, to get Kp, KI and KD values, uses these values as the PID controller´s input, to control the body lateral acceleration. Comparing with non-controlled steering system, the simulation results show that the body lateral acceleration of the steer-by-wire system with Fuzzy-PID controller is smaller than that of non-controlled steering system, and the phase lag is also smaller, indicating that it has good tracking performance and better steering stability. The simulation results with the real vehicle test data are in good agreement, indicating the correctness and effectiveness of the simulation model.