Design and Performance Analysis of Automobile Headlamp Based on Light-Emitting Diode

Abstract

As a vital component of the automobile headlamp, its design is not only related to power loss but also affects the appearance of the automobile. Most importantly, its design directly affects the night lighting effect and driving safety. Compared with the traditional headlamp light source, light-emitting diode (LED) light source has the advantages of long lifespan, small size, fast response, flexible design, flexible control, and so on. Based on this, this study designs high-power white LED automobile headlamps, adopts the commonly used reflector design technology, and puts forward the design scheme of the lighting group system. This scheme relies on a reflector for light distribution, without needing a baffle or lens with light distribution patterns. The optical design software TracePro and the three-dimensional design software PROE are used to simulate and design the reflectors of low and high beams, respectively. The simulation results of the reflector of the low beam show that more than 490000 rays of light reach the filament shield, with a light utilization rate of over 95%. The horizontal cut-off line and 15° light and dark cut-off lines are clearly visible, and the front window material is closed. Considering this factor, the illumination distribution of the low beam meets relevant national regulations. The high beam reflector simulation results reveal that over 960000 light rays reach the filament shield, with a more than 95% light utilization rate. The light spot is symmetrical. If the front window material is polycarbonate and not coated, the absorption and scattering of light are ignored, and the transmittance of the beam through the two optical surfaces achieves 90%.