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

With the continuous development of electronic control technology in the automobile industry, the integration of electronic components in the automobile control system is increasing day by day, which significantly improves the safety performance and handling stability of the automobile. After entering the 21st century, the rapid development of intelligent technology makes the steer-by-wire system gradually integrated into modern automobile design. Because the steer-by-wire system cancels the mechanical connection between the steering wheel and the steering wheel in the traditional mechanical steering system, various road information on the road can’t be directly transmitted to the driver through the steering wheel in the form of road sense, and the driver can’t truly feel the road information, which is not conducive to the driver's control of the car. Therefore, this paper studies the road sense simulation method of steer-by-wire system. Firstly, the dynamic model of the steer-by-wire system was established, and the model of the steer-by-wire system was built in Simulink. The effectiveness and accuracy of the system was verified by selecting steering wheel Angle step and double shift working conditions in Carsim, which laid the foundation for the design of the subsequent road sense simulation algorithm. The state estimation method is used to simulate the road sense torque, and the formula for calculating the righting torque is established based on the dynamics model of the traditional steering system. A two-degree-of-freedom vehicle model was established, and the righting torque caused by vehicle lateral force, tire longitudinal force and tire load was calculated respectively. Friction torque, damping torque, limiting control torque and active righting torque were added to compensate the road sense torque. Finally, the road sense designed by this method is more real than that of the mechanical steering system under the steering disc lightweight test and central area test.