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2 2008

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The concept of the wheeled vehicle’s adaptive stop lamps operation

Łukasik M.

Przegląd Elektrotechniczny

2008

R. 84, nr 8

186-189

The essence of concept of adaptive stop lamp is a creation of regulating system controlling the light source. It should take account of certain optimum of external ambient and coming from the inside of lamp factors that influence the most visibility of stop lamp signal. One has to have in mind that warning function of stop lamp bases on clear distinction from other signals emitted toward the rear of vehicle. In this paper the photometric requirements concerning stop lamps are presented, the concept of adaptive stop lamps operation is discussed and the results of so far done research are explained.

Istotą koncepcji adaptacyjnych świateł hamowania jest stworzenie systemu regulacji źródła światła, z uwzględnieniem czynników zewnętrznych jak i pochodzących z wnętrza lampy, których wpływ ma istotne znaczenie na postrzeganie sygnału hamowania pojazdu. Należy mieć na uwadze to, że funkcja informacyjna sygnału hamowania opiera się na jego wyraźnym odróżnieniu od innych sygnałów emitowanych do tyłu pojazdu. W referacie zostały przedstawione wymagania dotyczące parametrów świetlnych świateł sygnałowych hamowania, koncepcja adaptacyjnych świateł hamowania oraz wyniki dotychczasowych badań nad modelem eksperymentalnym.

Dirt deposits' influence on luminous flux distribution of passing lights

Kaźmierczak P., Łukasik M.

Journal of KONES

2008

Vol. 15, No. 2

163-171

In each discipline of lighting technology where light has influence on the users' health and safety, for the use of lighting devices, the so called, maintenance systems was established. Based on the accepted algorithms, among the others, intervals of light sources replacement and cleaning of luminaries are determined. The subject of the influence of headlamps dust deposits' on their photometric parameters is very rarely tackled in the vehicle lighting technology. Probably the reason for this is the assumption that a driver will control visually lighting condition of his vehicle. Unfortunately, in practice this assumption is not met usually. Only a few vehicle models are equipped with headlamp washers or wipers. During normal service life of the vehicle the lenses of headlamps are cleaned occasionally, mostly during the vehicle washing, or sometimes after noticing heavy dirt deposits. However, internal surfaces of headlamp are not cleaned at all. Paradoxically, in the winter, when it gets dark earlier and headlamps' light is used for a longer periods, the vehicle cleaning is more rare, because of very low temperatures. The article present examples of measurement results of dirt deposits' influence on illuminance distribution changes on the road surface (on measuring screen) of headlamp equipped with halogen bulb and discharge light source. The concept of solving headlamp lens maintenance problem by using lens soiling detector, is also illustrated.