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Body 81
9-5
Driver airbag
The driver airbag is mounted inside the steering
wheel.
The driver airbag is a dual-stage type. This
means that it can be inflated in two stages at
different pressures depending on the force of the
impact and the position of the seat.
If the seat is in a forward position, i.e. less than
30% (approx 65mm / 2.56in) from its front
position, stage 1 will be inflated. This means that
only 80% of the maximum pressure in the airbag
will be utilized. This function is an adaptation of
the personal protection system, i.e. the protection
will be optimized according to the present
circumstances and the airbag will not be inflated
to full pressure if the seat occupant is sitting far
forward.
With the seat in a rearward position, i.e. more
than 30% from its front position, stage 2 can also
be inflated depending on the force of impact. This
means that 100% of the maximum pressure in
the airbag will be utilized.
After an activation command, the control module
will apply a current to ignite the driver charges.
The driver charges generate a gas when they
burn. The filter cools the gas and removes any
particles before it passes to the airbag.
The charge is split into two stages. These stages
are a primary stage (1) that provides 80% of the
pressure and a secondary stage (2) that provides
another 20%. Depending on the information that
the control module receives from the different
sensors, the two stages will ignite at different
times.