Xây dựng mô hình và khảo sát một số yếu tố ảnh hưởng đến ổn định hướng của ô tô dùng hệ thống lái bốn bánh dẫn hướng

Abstract

Based on the dynamic theory of vehicle steering systems, the article studies
the following issues: Firstly, the authors build a dynamics model of 4WS vehicle in
horizontal plane. Secondly, the authors use Matlab/Simulink software to investigate
the influence of the steering wheel rotation angle on the angular velocity, horizontal
velocity, horizontal slip angle of the vehicle, and horizontal slip angle at the front
and rear wheels at high speed as 30 km/h and 90 km/h. From the survey results, the
author found that vehicles using the 4WS steering system have better maneuverability
at low speeds and more stability when running at high speeds compared to vehicles
using the traditional 2WS steering system. However, when the driver drives at high
speed, both the 4WS and 2WS vehicles also have much larger lateral and angular
velocities than the vehicle when running at low speed. Drivers should drive at the
allowed speed according to regulations.
Keywords: Four-wheel steering, directional stability, automotive dynamics.