The development of active front wheel steering system

• Main Author: Zakaria, Mohd Hafidz
• Format: Thesis
• Language: English; English
• Published: 2014
• Subjects: T Technology (General); TL Motor vehicles. Aeronautics. Astronautics
• Online Access: http://eprints.utem.edu.my/id/eprint/15028/; https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=92082

This study deals with the use of Active Front Wheel Steering (AFWS) system in reducing the unwanted yaw motion cause by the side wind disturbance. The core of this study is the development of a control structure for AFWS system in a nine degree of freedoms full vehicle model, which consists of handling, ride and tyre model as to study the vehicle dynamic behavior in lateral axis. Validation with the CarSimEd software was conducted to identify the behaviour of the full car model when the steering input is given. Through a double lane change test, the results show that the developed full vehicle model and CarSimEd data are having a good agreement with acceptable error. Then, the control structure for the Active Front Wheel Steering system then developed on the validated full vehicle model to reduce the unwanted yaw motions after the side wind force is applied to the body of the vehicle. The proposed control structure for the AFWS system consists of two control loops, which named as the inner loop and outer loop controller. It consists of a serial feedback control which is operated based on the response of vehicle lateral position and yaw rate. Lastly, the controller is tested on the Hardware-in-the-loop simulation (HiLS) which will examine the effectiveness of the whole AFWS system. A collaboration between software and hardware in HiLS shows that the system can reduce the effect of the side wind disturbance in terms of lateral displacement error, body slip angle, yaw and yaw rate responses.