Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (3): 72-77.doi: 10.3969/j.issn.1000-565X.2014.03.012

• Traffic & Transportation Engineering • Previous Articles     Next Articles

Design of LED Lens for Vehicle Dipped Headlight Based on Infinitesimal Energy Mapping

Zhang Jin- yong Li Li- fu   

  1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2013-07-24 Revised:2013-12-06 Online:2014-03-25 Published:2014-02-19
  • Contact: 张晋勇(1982-)，男，博士生，主要从事汽车照明光学研究． E-mail:xf000941z@163.com
  • About author:张晋勇(1982-)，男，博士生，主要从事汽车照明光学研究．
  • Supported by:

    广东省重大科技专项 (2009A080301013， 2010A080402009);广东省汽车工程重点实验室基金资助项目(20110030);广州市重大科技专项(2010U1- D00221， 2011Y5- 00006)

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Abstract:

In order to improve the luminous energy rate of dipped headlight in the LED projection headlamp systemcommonly used in vehicles,the relationships between the lighting distribution of LED dipped headlight and the lightsource energy as well as the freeform lens parameters were investigated based on the theory of non- imaging optics,and a design method of LED freeform lens for vehicle dipped headlight was proposed based on the infinitesimalenergy mapping.Then,in order to verify the feasibility of this design method,a LED lens was designed with thesoftware Rhino,and an illumination system of LED dipped headlight was constructed with the software Tracepro.Simulated results indicate that the designed lens not only provides illumination patterns matching the dipped head-lamp regulation but also possesses a luminous energy rate increment of 23. 5%,as compared with the traditionalLED projection headlamp system.

Key words: non- imaging optics, LED, illumination, dipped headlight, freeform lens

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