| Electric Power Steering System(EPS), a new type of vehicle steering system, which emerged in recent years, is an advanced technology which synthesizes modern control technologies, incorporation of machine & electricity and latest electronic technologies. It's important to set up an accurate math model in midst of studying EPS. The math model is set up after analyzing the system, two control methods which include variable structure control with filter and neural network discrete variable structure control are adopted on account of the uncertainties of the plant parameter variations, simulation results show the control methods are invulnerable to plant parameter variations and can solve the conflict between 'portability' and 'sensitiveness' of vehicle. Besides, an adaptive neural fuzzy control method is proposed to control the system, simulation results show the control method can better improve the steering portability and sensitiveness. In order to verify the theory, bench test and road test are carried out in which the variable structure control method and the adaptive neural fuzzy control method are used to control the system, the tests results demonstrate the effectiveness of proposed control methods.
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