Wyniki wyszukiwania - BazTech

1

Investigation of characteristics and thermal loading of LEB bulbs for automotive headlights

Mashkov P., Gyoch B., Ivanov R.

Transport Problems

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2018

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T. 13, z. 3

85--95

EN

The aim of the study is related to obtain real data for the LEDs’ thermal load and characteristics of several LED lamps types H4 and H7 for automotive headlights with different cooling system. Power consumption, temperature regimes of the LEDs’ operation, lamps’ radiation spectral distribution, and luminous flux of lamps for automobile headlights with active and passive cooling system at different ambient temperatures have been investigated. The obtained data under real conditions of operation in several cars have been verified. The results are compared with the data in promotional materials and the requirements of Regulations of the United Nations Economic Commission for Europe. Studies enable to evaluate the feasibility, advantages and disadvantages of LED lamps of this type when replacing standard halogen lamps in headlights.

2

Resistance test of deposited aluminium layer on parabolic parts of vehicle headlight

Adamik M., Alló Š., Kročko V.

Management Systems in Production Engineering

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2014

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nr 4 (16)

187--189

EN

This paper documents a basic quality measurement in an automotive light industry. The experiment is based on a verification of reflective aluminium layer resistance against 100% humidity and higher temperature. This simulates the lifetime of a headlight on vehicle. The goal of this test is to prove that the reflective aluminium layer is able to resist to this environment without any changes in its structure. If any change occurs, the modification of production process will be needed.

PL

W pracy udokumentowano podstawowe pomiary jakości w przemyśle motoryzacyjnym. Na podstawie doświadczeń, zweryfikowano odporność odbijającej warstwy aluminium, w 100% wilgotności i w podwyższonej temperaturze. Symulowano żywotność reflektorów w pojeździe. Celem tego testu było wykazanie, że warstwa odbijająca aluminium jest w stanie oprzeć się tym warunkom bez zmiany struktury. W przypadku wystąpienia jakichkolwiek zmian, będzie potrzebna zmiana procesu produkcyjnego.

3

Objective tests of headlamps in exploitation conditions from traffic safety point of view

Targosiński T.

Journal of KONES

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2007

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Vol. 14, No. 2

493-504

EN

From many years the only exploitation activity regarding headlamps is visual aiming on the base of cut-off line. From one side there are many advanced headlamp designs with excellent performance including gas discharge devices or LED's as light source. In last few years there are many efforts towards to work out laboratory objective quality assessment methods. An example is works of technical committee CIE TC4-45. But in exploitation significant numbers of vehicles are equipped with low quality headlamps installed after repairs. Also many plastic lenses are scratched and tarnished and inside parts of headlamp are dusty. Results of this problems are not noticed during simple periodical technical inspection. In Motor Transport Institute headlight analyzer was worked out. It utilizes CCD camera and computer image analysis and allows test detailed characteristics of beam pattern in garage conditions in objective way. Using these device measurements of many vehicles in exploitation conditions was done. There was find out that significant percentage of headlamps in use does not meet minimum type approval requirements. In paper results of tests are presented and main factors responsible for difference between type approval and exploitation are described.