Front Wheel Drive, Rear Wheel Drive, And Four Wheel Drive Effect Comparison To Vehicle Directional Stability

Loh, Zhia Yew (2008) Front Wheel Drive, Rear Wheel Drive, And Four Wheel Drive Effect Comparison To Vehicle Directional Stability. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research was aimed to compare the vehicle model directional stability of Front Wheel Drive (FWD), Rear Wheel Drive (RWD), and Four Wheel Drive (4WD). The model is considered to be directionally stable if, following a disturbance, it returns to a steady – state regime within a finite time. The models were built based on three – degree – of – freedom vehicle motion (bicycle model). Unlike other models done in the past, in this research tractive forces were taken into account. The output responses were lateral acceleration and the vehicle yaw rate responses. The bicycle models produced would be considered having constant forward velocity, 72km/h while aerodynamic effects, chassis or suspension compliance effects, rolling or pitching motions, longitudinal load transfer, and lateral load transfer were been neglected. The comparison to verify the three different models in term of vehicle directional stability was made in computer simulation (MATLAB & Simulink), bearing in mind all the general cornering variable values/parameters. According to the results achieved, it was concluded that RWD having the best vehicle directional stability as it was able to show better handling condition.

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