Audi A3 Sportback, Сервисная инструкция, Страница: 18 / 60

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Detonator 1 Priming charge 1 Propellant charge 1 Coil spring Filter
Detonator 2 Priming charge 2 Propellant
charge 2 Rupture disc Pressurised gas bottle
Gas:
argon approx.
98%
helium approx.
2%
Pressure:
approx. 250 bar
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Coil spring
Occupant protection
Front passenger airbag, N131, N132
Unlike the driver airbag, the gas generator in the front passenger airbag works by the hybrid gas principle.
The gas generator consists of two pyrotechnic propellant charges which are integrated in a pressurised gas
bottle.
The detonator activated by the airbag control unit ignites the first propellant charge by means of the priming
charge. Should the pressure developing inside the gas bottle exceed a preset value, the rupture disc will
explode and the gas mixture will inflate the airbag. The airbag is further inflated by the combustion of the
second propellant charge .
The coil springs ensure that the propellant charges burn as intended.
Side airbags, N199, N200
Like the airbags used in the Audi A6 ´05, the side airbags used in the Audi A3 Sportback are modules.
For further details, refer to Self-Study Programme 323, Audi A6 ´05.
So-called pyrotechnic tubular gas generators are used as gas generators.
If the airbag control unit detects a side impact which meets the criteria for deployment, then it energises the
relevant side airbag detonators. The primary charge is ignited by means of the priming charge. The
developing gas flows through the metal filter into the airbag.
Air outlet Metal filter Priming charge
Air outlet Propellant charge Detonator
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