TU Darmstadt / ULB / TUbiblio

Influence of dirty headlamps on straylight and glare - A test series under real driving conditions

Schiller, Christoph and Kosmas, Kyriakos and Kobbert, Jonas and Khanh, Tran Quoc
China Illuminating Engineering Society (CIES) (Corporate Creator) (2016):
Influence of dirty headlamps on straylight and glare - A test series under real driving conditions.
In: Proceedings of the 4th International Forum on Automotive Lighting (IFAL), In: 4th International Forum on Automotive Lighting (IFAL), Shanghai, 16.-18. Juni 2016, [Conference or Workshop Item]

Abstract

This paper presents selected results of a field study to test the effect of dirt on the headlamps on stray light as well as the efficiency of headlamps cleaning devices. First results show, that the headlamp cleaning devices show an efficiency up to more than 30 %. Especially stray light from below cut-off line deflected to areas above it can be reduced. The cleaning effect above cut-off line seems to be rather small for the presented circumstances.

There are two main reasons, why clean headlamps are essential for traffic safety – dirty headlamps reduce driver’s visibility distance and moreover they can glare other road users. Therefore, the regulation No. 48 of the Economic Commission for Europe (ECE) prescribes a headlamp cleaning system. But this rule is limited to “dipped-beam headlamps with a light source or LED module(s) producing the principal dipped beam and having a total objective luminous flux which exceeds 2000 lumen” [1].

In recent years LED headlamps are increasing their market shares. They are enabling extremely efficient front lighting systems with the performance of high intensity discharge headlamps (HID) while using less than 2000 lm for the dipped beam. Due to limited space in the motor compartment and the efforts to increase energy efficiency by reducing the total vehicle weight and to reduce the total costs car makers tend to economize on the headlamp cleaning systems.

Keeping in mind, that LED headlights with possibly less than 2000 lm get more and more common on the market, the Laboratory of Lighting Technology at the Technische Universität Darmstadt performed a test series with several cars under real driving conditions in order to determine the effects of dirty headlamps on stray light and therefore on the potential of glaring other road users. The test results should be of importance for the traffic situations and traffic accidence reduction in China and other countries e.g. in Northern Europe.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Schiller, Christoph and Kosmas, Kyriakos and Kobbert, Jonas and Khanh, Tran Quoc
Title: Influence of dirty headlamps on straylight and glare - A test series under real driving conditions
Language: English
Abstract:

This paper presents selected results of a field study to test the effect of dirt on the headlamps on stray light as well as the efficiency of headlamps cleaning devices. First results show, that the headlamp cleaning devices show an efficiency up to more than 30 %. Especially stray light from below cut-off line deflected to areas above it can be reduced. The cleaning effect above cut-off line seems to be rather small for the presented circumstances.

There are two main reasons, why clean headlamps are essential for traffic safety – dirty headlamps reduce driver’s visibility distance and moreover they can glare other road users. Therefore, the regulation No. 48 of the Economic Commission for Europe (ECE) prescribes a headlamp cleaning system. But this rule is limited to “dipped-beam headlamps with a light source or LED module(s) producing the principal dipped beam and having a total objective luminous flux which exceeds 2000 lumen” [1].

In recent years LED headlamps are increasing their market shares. They are enabling extremely efficient front lighting systems with the performance of high intensity discharge headlamps (HID) while using less than 2000 lm for the dipped beam. Due to limited space in the motor compartment and the efforts to increase energy efficiency by reducing the total vehicle weight and to reduce the total costs car makers tend to economize on the headlamp cleaning systems.

Keeping in mind, that LED headlights with possibly less than 2000 lm get more and more common on the market, the Laboratory of Lighting Technology at the Technische Universität Darmstadt performed a test series with several cars under real driving conditions in order to determine the effects of dirty headlamps on stray light and therefore on the potential of glaring other road users. The test results should be of importance for the traffic situations and traffic accidence reduction in China and other countries e.g. in Northern Europe.

Title of Book: Proceedings of the 4th International Forum on Automotive Lighting (IFAL)
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Light Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology
Event Title: 4th International Forum on Automotive Lighting (IFAL)
Event Location: Shanghai
Event Dates: 16.-18. Juni 2016
Date Deposited: 17 Apr 2017 05:07
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