In preceding publications glare measurements of the bending light function were presented, showing the effect of the bending light function of AFS on the glare illuminance EB of oncoming drivers. The appearance of adaptive front lighting systems depends not excusively on the light distribution of the headlight and its electronic control units, but also on the reflection properties of the road. A great research effort has been spent in the past on the modeling and measurement of the luminance coefficient of road pavement. These parameters were investigated in laboratory as well as field measurements. For laboratory measurements two road samples from public roads where provided by the Braunschweig Technical University. The aim was to define a value called the 'normalized luminance coefficient'. The field measurements validate the conclusions which were impelled by the laboratory measurements. The reflection properties of dry roads can be easily described by a linear equation and the measurements also validate the assertion, that for a wet road the luminance coefficient decreases. The way test persons perceive the bending light function has been investigated in dynamic experiments. A test car equipped with a bending light system based on gas discharge lamps was presented to 60 test persons who had the opportunity to drive the car for at least one hour on town and country roads in public traffic. The test persons were divided in two groups, driving the car with different swiveling strategies. After driving the test persons answered questionnaires rating the lighting quality with subjective criteria. The bending light system was rated as 'very good' in the perceived safety feeling. No significant difference between both swiveling strategies were noted. Nevertheless it is interesting to see that even during wet road conditions the benefit of AFS was perceived although the measurements had shown poor reflective properties on wet roads.
Criteria for the development of adaptive light distributions considering dry and wet road surfaces
Kriterien für die Entwicklung adaptiver Scheinwerfersysteme unter Einbeziehung trockener und nasser Fahrbahnoberflächen
2003
11 Seiten, 8 Bilder, 13 Quellen
Conference paper
English
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