ISO 13207-1:2012

INTERNATIONAL ISO
STANDARD 13207-1
First edition
2012-02-15
Road vehicles — LED lamp characteristics
for bulb compatible failure detection —
Part 1:
LED lamps used as direction indicators
Véhicules routiers — Caractéristiques des lampes LED pour détection
de défaut compatible avec l’ampoule —
Partie 1: Lampes LED utilisées comme feux indicateurs de direction
Reference number
©
ISO 2012
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Foreword
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ISO 13207-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical
and electronic equipment.
ISO 13207 consists of the following parts, under the general title Road vehicles — LED lamp characteristics for
bulb compatible failure detection:
— Part 1: LED lamps used as direction indicators
INTERNATIONAL STANDARD ISO 13207-1:2012(E)
Road vehicles — LED lamp characteristics for bulb compatible
failure detection —
Part 1:
LED lamps used as direction indicators
1 Scope
This part of ISO 13207 specifies the characteristics of LED (Light Emitting Diode) lamps used as direction
indicators when optionally monitored. It applies primarily to those lamps which are installed on 24V truck/trailer
combinations. It will enable lamp-failure detection of LED lamps on the drawn vehicle to be compatible with
that for bulbs when analysed by the towing unit.
2 Terminals
The connection between the towing vehicle and the towed vehicle should be either as described in ISO 1185
and ISO 3731 or as described in ISO 12098. Towing vehicles should be equipped with electronic control units
(ECUs), which drive the trailer direction indicator lamps as described in ISO 4082.
3 Functional description
3.1 Principle
Lamp-failure monitoring electronics are required for mandatory mounted direction-indicator functions. For this
purpose, the LED direction-indicator function generates a current impulse at a certain time; this current impulse
corresponds in terms of amount with the current of a conventional bulb lamp. If the LED direction indicator fails
(in relation to the legal requirement of the photometric output), this pulse is not generated. An ECU or intelligent
flasher interprets whether the LED direction indicator fails on the basis of this pulse. The result should be used
to inform the driver accordingly.
Key
1 first process
2 second process
3 non-failure
4 failure
5 voltage: power supply of direction indicator during two flashing processes
6 current of LED direction indicator during two flashing processes, the first with, and second without, current control
pulse added
I current
I nominal LED lamp current
I I + control pulse current
1 2
T time
T starting point of the designated pulse time frame
T end of the designated pulse time frame
T earliest start point for the control pulse
T latest end point for the control pulse
T time frame within which the designated control pulse should be detected by the monitoring circuit of the control unit
U voltage
U operational voltage
B
Y voltage, U, in volts; current, I, in amperes
Figure 1 — Profile diagram 1
The functional description of
...