Matrix-Beam is based on a LED driving beam. Its light distribution is divided in many light segments. Each segment is illuminated by one LED. This allows an individual switching of each light segment. A camera with an image-processing unit detects the position of other vehicles and only those LEDs which are really glaring are automatically switched off. Up to now it isnt known how many light segments are needed to yield an efficient Matrix-Beam system. To solve this question a theoretical and a practical analysis of German streets are carried out. These examinations are the basis of a simulation to evaluate the efficiency of adaptive driving beam systems. Thus the efficiency of different segmentations of Matrix-Beam as well as the efficiency of other adaptive driving beam systems can be compared with each other. Furthermore a semi-dynamic test study will be presented. The consequences of these results for road safety will be discussed as well. Different segmentations with four till eight vertical light segments are enough to yield a high efficiency above 90 %. The next question to solve is the space needed to realize an optic module with a certain opening angle and intensity. The evaluating tool is based on the luminous flux. In a consequence of this important areas at the road side are underrepresented. So the weighting of a light segment is not optimal. Inspite of that its the only physical size which can be directly taken into account and this way is more realistic than taking the size of illuminated area into account only. The semi dynamic test study pointed out that the sight und thus the safety can be increased by ADBs. Due driving onto a glaring source (standing car with low beam) the sight distance with an aVCOL raises up to 23 m. Although the intensity of the used Matrix-Beam headlamp in comparison is much lower the improvement is still about 10 m and shows the high potential of this ADB. By the improvement of the sight distance by 23 m up to 83 % of front-end collisions can be prevented at a vehicle speed of 100 km/h. But the risk compensation leads to a higher vehicle speed while driving with a driving beam. Sprute evaluated this increase which is about 5 km/h. In a consequence of this the potential to avoid front-end collisions decreases to 68 %. Despite the risk compensation a high potential for road safety remains.
Matrix-Beam - an Adaptive Driving Beam System (ADB)
2009
10 Seiten, 3 Bilder, 2 Tabellen, 8 Quellen
Conference paper
English
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