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Enhancing Vehicle Direction Indicators: Proposal for LED Reliability and Failure Detection

This document outlines proposals by GTB and OICA regarding regulations on vehicle direction indicators, focusing on the activation of telltales for failure detection in multi-light source systems. It discusses the advantages of LED technology, including improved visibility and reduced wattage for fuel economy. The document highlights potential failure detection issues, emphasizing the need for a reliable system that can identify failures effectively. LD integration strategies and compliance with ECE-R.6 photometric standards are also presented to ensure consistent light intensity.

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Enhancing Vehicle Direction Indicators: Proposal for LED Reliability and Failure Detection

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  1. Informal document No. GRE-56-30 (56th GRE, 4-7 April 2006 agenda items 4.4. and 7.) Transmitted by the expert from GTB Proposals by GTB and OICA on Regulations Nos. 6 and 48Activation of a telltale, in the event of malfunction of direction indicators equipped with multiple light sources

  2. Advantages of LED – direction indicators: improvement of visibility lifetime as vehicle (filament lamps are wear parts) reduce of wattage (fuel economy) Failure indication: not possible with detection of current variation because resistance varies in respect to temperature depends on wiring is contradictory to high reliability of the system

  3. Series Connection DC/DC Converter 13,5V Each failure can be detected and indicated.Each failure of LED or electronic leads to a total breakdown of the system. Reliability of the DI-function is on a level with a one-filament-lamp-system.

  4. Parallel Connection in Groups F: Failure detection electronic Failure indication F F F 13,5V Each failure can be detected and indicated, the whole series of LED fails after a failure of one LED. Problems: The lamp must comply when one light source has failed. Electronics for failure detection and wiring doubles price of LEDs for DI.

  5. Matrix Connection Failure indication 13,5V When a second LED in a row fails it leads to an immediate break down of the third LED.This failure can be detected and indicated by the same means as used for a one filament lamp system.

  6. ECE-R 6 Photometric ECE-R 6 photometric was created for a single filament lamp and one reflector system. GTB/OICA proposal ECE-TRANS-WP29-GRE-2006-26 to amend ECE-R 6 is based on this existing light distribution. This means that in 10° horizontal 35 % of light intensity is required. For failure indication the proposal requires 50% light intensity of HV as minimum.

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