148n
Deceleration sensors continuously
monitor the acceleration forces acting
upon the vehicle. If, as the result of a
frontal collision, a deceleration is
reached at which the protection of the
safety belts alone is no longer adequate,
the gas generators of the driver and
passenger airbags are ignited. However,
the passenger airbag is only triggered if
an additional sensor has recognized
that the passenger seat is occupied.
In the event of a side collision, only the
side airbags will be triggered if neces-
sary. And only that airbag for that side
of the vehicle where the collision
occurred will be triggered.
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The airbags located under the marked
covers inflate and unfold in a matter of
a few milliseconds. In this process, they
tear through the designed separation
points of the covers or press them out.
Because the inflation process must be
virtually instantaneous, it is necessarily
accompanied by a certain amount of
ignition and inflation noise. The gas
required to inflate the airbags is not
dangerous, and the associated smoke
then dissipates.
The entire process is completed within
fractions of a second.
The AM frequency bands (medium-
wave, long-wave and short-wave) make
it possible to receive stations from a
great distance, because the broadcast
signals travel not only along the ground
as surface waves, but also as atmo-
spheric waves that are reflected from
the ionosphere.
Frequency-modulation (FM) provides
substantially better sound quality than
the other frequency bands. However,
because FM transmissions rely on line-
of-sight broadcast waves, their effec-
tive reception range is limited.
The limitations inherent to radio recep-
tion in a moving vehicle have been min-
imized by a number of innovative sys-
tem designs.
Airbags Radio reception
Online Edition for Part No. 01 41 0 155 083 - © 03/00 BMW AG
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