Xenon headlamp, location/function

P82.10-3202-06

1 Xenon headlamp

B Cover

E1 Left front headlamp unit

E1l1 Left high beam solenoid

E1n1 Xenon headlamp control module

E1n2 Xenon headlamp ignition module

E2 Right front headlamp unit

E2l1 Right high beam solenoid

E2n1 Xenon headlamp control module

E2n2 Xenon headlamp ignition module

The headlamps in model 215 differ from the previous xenon headlamps on account of their entirely new lighting technology development, which the xenon light uses for low and high beam lights.

The new lighting technology, known as Bi-Xenon, is located in the outer headlamps.

When the low beam lamps are switched on the xenon headlamp control module (E1n1, E2n1) activates the xenon headlamp control module and ignition module (E1n2, E2n2) via the control voltage within a few milliseconds.

A high-voltage surge from the ignition device ignites the xenon lamps, and in doing so an electric arc is formed between the electrodes. If an electric arc of sufficient stability is detected the control circuit switches the control modules (E1n1, E2n1) over to power-limiting mode.

With the bi-xenon headlamps, the light generated in the previous manner in a gas discharge lamp (D2S lamp) travels directly through the optical system without being reflected.

A voltage converter generates the required voltage for the reliable function of the xenon headlamp.

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For technical reasons the xenon lamp has a timed startup characteristic. After switch on, 50 % of the luminosity is reached within 1 to 2 seconds and full luminosity is achieved after another approx. 30 seconds.

The entire luminous flux is made available for the high-beam lights. When switching over to low-beam operation a screen is moved into position between the gas-discharge lamp and the lens, which covers up the luminous flux directed into the distance and thus helps to prevent oncoming traffic from being dazzled.

The shield (B) is controlled electro-mechanically by the solenoids in the right and left high beams (E1l1, E2l1).