Study On Integrated Control Of Vehicle Electric Power Steering And Active Suspension System Based On Output Feedback

The dissertation aims to realize the integrated control of the vehicle Electric Power Steering and Active Suspension System based on the control scheme of output feedback. Firstly, a simulation of a 1/4 car dynamic model is given under steering situation. Secondly, based on the integrated model of the steering and active suspension presented, an extensive regulator of active suspension LQG control is designed to complete the control of the yaw rate, vertical acceleration, pitch angle and roll angle of the car body. Combining automotive Electrical Power Steering System (EPS) model and steering model with Active Suspension System (ASS), a full car dynamic model is set up. Based on the integrated model, the Random Sub-Optimal integrated Control of output feedback is presented to control the EPS and ASS. The presented control scheme improves vehicle maneuverability, handling, safety and ride performance. Thirdly, the optimal variable structure control scheme is presented. The simulation results confirm that the control scheme not only can improve the maneuverability, but also can control the position of the body. Finally, the dissertation particularly introduces the process of designing the SCM hardware and software, then the tests are carried out under different situations, the test results prove the validity and feasibility of the integrated controllers and that the models are correct.