For all signalling functions, LEDs already allow reductions in power consumption and then CO2 emissions for fuel engines powered vehicles. Typical values to be considered are savings of 0.02 litre / 100 km for a rear signalling function and 0.05 litre / 100 km for a DRL. The different possible optimisations will have a significant impact on the onboard electrical power consumption rather than on the fuel consumption / gas emission. Next generations of hybrid and electrical vehicles will use more and more of those optimizations to increase their driving range in electrical mode. With front lighting applications, it is now possible to get a low beam with halogen performances level consuming 20W per side (including 20% power supply losses) and 15W with available LEDs engineering samples. This is directly applicable for all electrical vehicles which have a more urban mission profile and which will also fully benefit from a possible halved power consumption in town lighting mode. For other vehicles, for which the use of Xenon level lighting is a key element in term of safety at night (for example for high speed driving), it is necessary today to use 45W per side to get the same performance with LEDs (3 multi-chips LEDs + driver) and it is already possible to reach 900 lm performances with mock-up designs and LEDs engineering samples using only around 35W. Today's practical value is slightly above Xenon level (typically 40W with ballast), with the short term value being identical to Xenon. With the light sources evolutions as well as the different technical solutions presented in this paper, Xenon performances low beams will use less than 30W in 2015. Upon mission profile, it could be around 20W, considering advanced functions which adapt the quantity of light to the real needs of the driver (like town lighting which also make sense for high-end spot beam global beam (two modules). Efficient design for low power conspumtion with LEDs 415 cars with powerful engines). This will represent an additional 40W saving at the vehicle level.
Efficient design for low power consumption with LEDs
2009
12 Seiten, 12 Bilder, 11 Quellen
Aufsatz (Konferenz)
Englisch
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