Design of Road Sense Simulation Method for Automobile Front-Wheel Steer-by-Wire System

<div class="section abstract"><div class="htmlview paragraph">Because the steer-by-wire (SBW) system cancels the mechanical connection between the steering wheel and the steering wheel in the traditional mechanical steering system (MSS), various road information on the road cannot be directly transmitted to the driver through the steering wheel in the form of road sense. Consequently, drivers are unable to genuinely perceive this road information, which adversely affects their control of the vehicle. This paper investigates the road perception simulation method for SBW systems. Initially, a dynamic model of the SBW system is developed, and its validity is confirmed under conditions of step changes in steering wheel angle and dual-shifting scenarios. A state estimation approach is employed to simulate road perception torque, and a corresponding torque calculation formula is derived based on the dynamic model of traditional steering systems. A two-degree-of-freedom vehicle model is constructed to independently compute the lateral force experienced by the vehicle and the torque resulting from tire loads. Additionally, friction torque, damping torque, limit control torque, and active centering torque are incorporated to offset the road feel torque. The designed compensating torque changes with the change of speed and steering wheel angle, and the parameters can be adjusted arbitrarily, so that the designed road sense can meet the driver's preference, improve the vehicle's righting performance, and enhance the driver's driving experience. Finally, the steering wheel light test and the center area test show that the steering light of the vehicle can be achieved at low speed, and the driver can get a clear sense of the road at high speed.</div></div>