Electric vehicle yaw stability using four wheel active steering control

Rosli, Nazrin Nazihah (2021) Electric vehicle yaw stability using four wheel active steering control. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The past few years has seen the rapid development of yaw stability control system for electric vehicle since electric vehicle is getting more attention due to its environment-friendly that can reduce harmful exhaust emissions that have been linked to global warming. Poor vehicle stability control can lead to traffic accident where the driver will react disproportionately when the vehicle loses stability hence unable to recover active control of their vehicle. Four-Wheel Active Steering control systems has been used as an effective way to improve the yaw stability of the vehicle during cornering manoeuvres, in which rear steer angles are controlled by steering controller while front steer angles are directly coupled with the driver. In this study, a Four-Wheel Active Steering control system that can control both front and rear wheel steering angle are proposed to improve the performances of the vehicle in stability and handling severe manoeuvres for the electric vehicle. Firstly, a single-track two-degree of freedom linear vehicle model as well as desired model is established. Then, a Fuzzy Logic Control algorithm is designed to control the rear steer angle of the system. Finally, the simulations are performed by using MATLAB/Simulink for steep steer manoeuvres to analyse and evaluate the effectiveness of the proposed control system under various conditions such as high and low speed on dry and wet road conditions. The results of the step steer manoeuvres demonstrate that the Fuzzy Logic Controller give better performances in tracing the desired yaw rate and improve the stability of the electric vehicle. The Four-Wheel Active Steering system can significantly improve the stability and handling under various conditions.

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