Abstract
The Adaptive Front-lighting System (AFS) has been widely concerned in the area of traffic safety. Firstly, it's an analysis of research achievements about control method and mathematics model of AFS, and the question is focused on the lag of headlamp control system, which means the actual bending angle of AFS always lags behind the steering-wheel angle. Then, a study of how to solve this lag has been proceeded. After the geometrical relations among safety braking distance and the rate of steering-wheel angle and turning radius of the vehicle is analyzed, an mathematics model considered these variables has been set up. In order to improve the road illumination of the bending beginning stage, a preview control method and the control algorithm of preview model, rolling optimization and feedback correction have been set up. Based on this preview control algorithm, a simulation model of the whole AFS has been built as well as the AFS control experiment platform. After a comparison between preview control and servo control, it can be discovered that preview control method is superior to servo control in AFS system.
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