The Bending Mode Control Method of AFS System Based on Preview Control

Abstract

Abstract-Due to the time-lag of both the mechanical transmission and controller area network (CAN)bus transmission of the Adaptive Front Lighting System (AFS), the actual bending angle of AFS invariably lags behind the steering-wheel angle，which not only makes the real-time response speed of the AFS system slow, but also makes the system stability and the active safety of the vehicle poor.To solve the problem, firstly, the geometrical relations among safety braking distance and the rate of steering-wheel angle and turning radius of the vehicle are analyzed. Secondly, the mathematics model among these variables has been set up. Finally, in order to improve the road illumination of the curve, the control method of bending mode of AFS system based on preview control is proposed. Based on preview control algorithm, the simulation model of the AFS has been built as well as the AFS control experiment platform. After the comparison between preview control and servo control, it can be proved that the preview control method proposed is superior to traditional servo control in AFS system.

Development of CAN network with improved parameters for adaptive car front lighting system

“…The preliminary inspection algorithm is a modern algorithm that is widely implemented. It is developed on the basis of the contrast algorithm and based on studying the functioning of the driver's eyes, namely determining the distance of focused view [5,6]. High-quality road lighting should be provided at a distance of focused vision.…”

“…The authors of [5] note that the electromechanical drive has a delay of 40 ms, and the delay of signals in the CAN network, leading to the fact that the AFS at the road turns lags behind the turning angle of the vehicle. Strategies and methods that used an electric drive system to control the rotation of headlamps did not solve the problem, as the turning angle of headlamps in real time lags behind the driver's intentions.…”

“…The authors believe that AFS implementation needs hightech equipment. The problem of AFS control is not solved by a pre-set algorithm [5].…”

“…This network, along with Arduino, is used to control the AFS. However, as can be seen from [4,5], there are different opinions regarding the use of the CAN network for the AFS system. Therefore, it is necessary to make a detailed analysis of its work.…”

Design and Implementation Intelligent Adaptive Front-lighting System of Automobile using Digital Technology on Arduino Board

“…In comparison with the prior art, the arrangement of lamps is not allowed to use stepper motors [6] or any other rotation system, thus reduces power consumption and avoids the problems of the engine failure. Moreover, the purpose of this article is a system that assembled them into a single module.…”