Research On The Control Strategy Of Adaptive Front-light System

The front-light mainly uses in an automobile is to provide enough road illumination at night travel. Its brightness and the illumination direction are essential for driving safety. Nowadays, most vehicles apply fixed headlight system to provide illumination for the front road, but it doesn't allow vehicles to project front-light beam onto road properly when making turns or cruising up and down hills, and resulting in increased the incidence of accidents.The illumination direction of front-light is changed when the vehicle curve, cruising up and down hills, sharp accelerate and decelerate and run on superelevation road. In order to the illumination scope to be best, this article takes the Adaptive Front-light System as the research object, mainly focuses on the illumination insufficient question which the vehicle turning, pitching and banking, the control strategy of Adaptive Front-light in vehicles was discussed. The main works and achievements are as follows:1. Control strategy for horizontal angle. As the existing curve algorithm in the actual use scope is narrow, the horizontal angle of headlight illumination is according to the program which illumination scope boundary tangent with front wheel travel path, revised to the existing curve algorithm and obtained the horizontal angle of headlight illumination is relevant with not only the vehicle speed, but also the radius of turn.2. Control strategy for vertical angle. Adjustment of the vertical angle of headlight illumination in this paper is according to the driver's viewpoint and vehicle center of gravity movement tangent line direction, and vehicle body bounce, pitch, and roll angle which change the headlight illumination distance. So the vertical angle of headlight illumination is relevant with angle of pitching, angle of heel and the vertical displacement of vehicle.3. Vehicles dynamic estimation. This paper design kalman filter and determine its estimate, realize the vehicles dynamic estimation. Then the paper emulates the dynamic model of vehicles and simulated 4 kinds of common state of roads by ADAMS/Car. The vertical displacement of front-light is filtered and estimated when vehicle runs on the bumping roads.4. Simulation and Visualization. This paper input the ADAMS/Car simulation result to the front-light control algorithm which is established by MATLAB, then obtained the horizontal angle and vertical angle of front-light when the vehicle run on 3 kinds of roads. Finally adjust dynamic process of front-light is visualized by MATLAB.5. Engineering application of adaptive front-light system. The control panel of virtual instrument is compiled by LabVIEW, and the control flow about the horizontal angle and vertical angle of Front-light is discussed, then the control scheme of simulation is designed. At last, the Prototyping Platform is built based on the automatic control process chart.Adaptive Front-light System is the trend of Vehicle Lamp, while this research is still in its infancy. This paper provided theoretical guidance for the development and application of Adaptive Front-light, and established and lay foundations for improving manufacture of Vehicle Lamp.