Control model and simulation for Adaptive Frontlight System of vehicle on curve roads

Abstract

Dangerous traffic accident is easy to happen when vehicles move on curve roads at night. The main reason is conventional frontlight do not provide sufficient and reasonable illumination for nighttime visibility to be adapted to curves. On that situation, this paper was focused on control model and simulation for Adaptive Frontlight System(AFS) of vehicles on curve roads. Because vehicles’ movement was related to complex dynamics, firstly linear two-degrees-freedom turning model and lateral roll model of vehicles were studied. On the basis of these models, this paper put forward control algorithm of adaptive frontlight on curve roads. From the research, it was concluded that horizontal swing angles of vehicles’ frontlight on curve roads were adjusted according to drivers’ visual angle change with velocity change, front wheels’ swing angle and side-slip angle, and vertical swing angles of vehicles’ frontlight on curve roads was adjusted according to lateral roll angle of the vehicle’ body, and longitudinal irradiation distance of vehicles’ frontlight on curve roads was controlled by safe stopping distance of vehicles. Finally, control simulation model was built by virtue of Matlab/Simulink and was used to observe efficiency of established algorithm in the paper. The simulation result showed that vehicles’ frontlight action on curve roads was reasonable from some given inputs to correspoding outputs.