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International Journal of Automotive Technology > Volume 14(4); 2013 > Article
International Journal of Automotive Technology 2013;14(4): 595-603.
STUDY ON THE PERFORMANCE OF ACTIVE FRONT STEERING SYSTEM
Y. H. XU1, M. AHMADIAN2
1Xi Hua University
2Virginia Polytechnic Institute and State University
ABSTRACT
The performance of a steering system equipped with active front steering (AFS) device is investigated with the consideration of AFS intervention and a proposed dynamic model. Firstly, the kinematics and dynamics of AFS are illustrated based on the mechanism of AFS with planetary gear set and a detailed dynamic model. Furthermore, a basic control on the voltage of DC motor at AFS actuator is proposed. It is realized by a proportional controller that the input is the difference of desired steering ratio and a conventional gear ratio. Finally, two numerical simulations are carried out. One is on-center handling test to demonstrate the basic characteristics of AFS. The other simulation is to demonstrate the effects of vehicle speed, frequency of steering input and AFS intervention on steering system performance. It is shown that the proposed AFS dynamic model is capable to simulate dynamic performance of AFS. The effect of AFS intervention on turning efforts at hand steering wheel is inevitable and the turning comfort is deteriorated to some extent.
Key Words: AFS, Dynamics, AFS performance, Control strategy, Simulation
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