Controlling Of Electric Power Steering System And Testing Research

Electric Power Steering system(EPS) appeared recently is a new generation of intelligent power steering system. Compared with the traditional power steering system, the electric power steering system has many advantages, such as more intelligent, engine efficiency, environmental compatibility, safe initiative, simple in structure, easy for installation, etc. Now it is widely used in addition to large passenger vehicles other than passenger cars in all.EPS is mainly consisted of mechanical steering parts, the electronic control unit, assist motor, reduction mechanism, torque sensor, steering wheel angle sensor, speed sensor, and other components. It adopted control strategy and control algorithm to control assist motor which generate assist torque according to the steering torque from torque sensor and to steering angle from steering angle sensor. It offers a better solution in the power steering that the driver can have a various steering feels in different situations. Firstly the author dived into the analysis and study of every part of EPS. Secondly, multi-body dynamics analysis software ADAMS was introduced which is based on the application of theory of multi-body system in this kinematics .Then a simple kinetic model of EPS established in ADAMS/view. Tow simple control strategies were tested based on the EPS model.In order to study the dynamic characteristics of EPS, the vehicle model is established in ADAMS/view ,which contain EPS. Assist-torque and return-to-center Performance was studied based on the vehicle model .The data got from simulation test without assist torque would provide a basis for ideal assist current table.In the MATLAB/Simulink,EPS control strategy module and the electrical current PID controller module was established, as well as the model of assist motor. Through the co-simulation of ADAMS/view and MATLAB/Simulink, the dynamic characteristics of assist performance and return-to-center performance were studied. The paper provided a convenient and efficient way for the study of EPS. In this paper, semi-physical model test bench was built up whose heart is industrial control computer. Trough MATLAB/Simulink, control software interface is made possible and industrial control board is used as hardware interface. During mock-up test, some problems in the hardware was discovered and solved perfectly. This semi-physical model test bench offered a good method to test your control strategy and control algorithm, as well as a agreeable way to further study EPS.