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What Makes an Airbag Inflate?
In a deployment event, the sensing system sends
an electrical signal triggering a release of gas from
the inflator. Gas from the inflator fills the airbag
causing the bag to break out of the cover and deploy.
The inflator, the airbag, and related hardware are
all part of the airbag module.
Frontal airbag modules are located inside the
steering wheel and instrument panel. For vehicles
with roof-rail airbags, there are airbag modules in
the ceiling of the vehicle, near the side windows
that have occupant seating positions.
How Does an Airbag Restrain?
In moderate to severe frontal or near frontal collisions,
even belted occupants can contact the steering
wheel or the instrument panel. In moderate to severe
side collisions, even belted occupants can contact
the inside of the vehicle.
Airbags supplement the protection provided by
safety belts. Frontal airbags distribute the force of the
impact more evenly over the occupant’s upper body,
stopping the occupant more gradually. Roof-rail airbags
distribute the force of the impact more evenly over
the occupant’s upper body.
Rollover capable roof-rail airbags are designed to
help contain the head and chest of occupants in the
outboard seating positions in the first and second rows.
The rollover capable roof-rail airbags are designed to
help reduce the risk of full or partial ejection in rollover
events, although no system can prevent all such
ejections.
But airbags would not help in many types of
collisions, primarily because the occupant’s motion
is not toward those airbags. See When Should an
Airbag Inflate? on page 1-61 for more information.
Airbags should never be regarded as anything
more than a supplement to safety belts.
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