The Design Of Angle Control In The Adaptive Front-Lighting System Based On ARM

AFS(shorted for Adaptive Front-Lighting System). One of the causes of traffic accidents when you are driving at night is that corners exist lighting blind zone and front illumination is insufficient when they are at high-speed. So, the research of AFS, which can automatically adjust front-light illumination angle, improve the corners as well as front lighting, is very important and actual significance to improve the night driving safety and reduce traffic accident rate.The paper first elaborate to the important role of AFS in improving vehicle active safety, introduce to the present research situation and the trend of development. According to the composition and control principle of AFS, this paper design the hardware and software of AFS angle control unit and build a development platform based on ARM-Linux. We get a set of swiveling angle rule of AFS from which dynamics analysis of a car in different road running and research on the auto swiveling angle rule of the horizontal and vertical direction. Meanwhile, We calculate actual turning radius to use auto yawing angular velocity. The calculation method can improve the theoretical accuracy of the headlamp angle. We design the two-dimensional angle fuzzy controller based on fuzzy control theory to solve the problem which the Angle control of AFS is difficult to identify and adapt to the driver’s driving behavior due to the uncertain system real-time response speed, low control precision and poor stability. Finally, we establish the simulation model of AFS in Matlab/Simulink. We get the simulation results in the two case of constant input and dynamic input. Then, we get a detailed analysis for the results. According to the analysis results, we validate the performance of the two-dimensional Angle fuzzy controller. The experimental results achieve the desired aims.The innovation point of this paper:(1)We calculate actual turning radius to use auto yawing angular velocity;(2)We take stepping motor running frequency instead of deviation change rate as the second input parameters to improve the precision of the angle control system in the design of two-dimensional angle fuzzy controller.