基于LED照明与弱光收集的节能车灯双向二次配光设计

为进一步利用太阳能，提出了“双向”利用光线的LED车灯设计新理念。运用光路可逆原理与边缘光线原理，构造矩形复合抛物面，对LED车灯进行“双向”二次配光设计。计算了远光灯矩形复合抛物面反光杯所需的最大出光半角、理论长度，借助tracepro软件，模拟研究了该矩形复合抛物面结构的最高光通量、平均光通量、光通量利用率随长度的变化关系，进一步截取较理论长度综合光学性能更好的反光器应用长度L=130 mm，并在此长度下，模拟了该LED远光灯照度分布情况与弱光收集情况。该类型车灯的LED照明与弱光收集互为补充，双向提高了LED车灯空间重复利用率。在照明方面，该灯能够满足现行标准GB25991-2010的要求，相同照度下，照明范围更大；相同照明范围内，照度更高；在弱光收集方面，是对当前太阳能汽车非聚光模式收集太阳能的补充。

Bidirectional secondary light distribution design for energy-saving headlights based on LED lighting energy and weak light collection

In order to further utilize solar energy, a new concept of LED headlight design using bidirectional lighting was proposed.Based on the principle of light path reversible and edge-ray principle, a rectangular compound paraboloid was constructed to perform a bidirectional secondary light distribution design for the LED headlights. The maximum exit half angle and the theoretical length of the rectangular compound parabolic reflection cup were calculated. The relationship of the maximum luminous flux, the average luminous flux and the luminous flux utilization of the rectangular compound parabolic structure changing with the length were simulated by tracepro software. It was showed that the optical composite property of reflection cup in L=130 mm was better than in theoretical length, and at this length, the illumination distribution of the LED automobile high beam and the weak light collection were simulated. Results show that for this type of headlights, the LED lighting and the weak light collection complement each other, improving the LED headlights space reuse utilization. In terms of lighting, the headlights can meet the requirements of the current standard GB25991-2010;the illumination range is larger under the same illumination, while the illumination is higher in the same illumination range; in terms of weak light collection, it can offer addition to the solar energy collection of the current non-concentration mode on solar vehicles.