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A Smooth Angle Velocity Active Return-to-Centre Control Based on Single Neuron PID Control for Electric Power Steering System

The active return of the steering wheel is playing a significant role in Electric Power Steering(EPS) system. In order to have a safe driving experience and comfortable maneuverability when cornering, a smooth angle velocity active return-to-center(RTC) control strategy based on single neuron adaptive PID control is proposed in the paper. In the newly-designed RTC controller, the return angular velocity is designed to change as the steering wheel angle changes, making the steering wheel return to the center position accurately and smoothly. In addition, the proposed control strategy based on single neuron adaptive PID control can cope with the control parameter uncertainty in the process of RTC control. The experimental results demonstrate that the corrected active RTC control method compared with uncorrected one effectively reduces the residual angle of the steering wheel at low vehicle speed as well as improves the RTC performance of the vehicle which does not affect the basic assist characteristics.