Chevrolet 1994 Astro Bedienungshandbuch PDF herunterladen (Seite 39)

How

The

Air

Bag

System

Works

Where is the air bag?

The Driver's Facial Air Bag is in the middle of the steering wheel.

When is an air bag expected to inflate?

The air bag is designed to inflate in moderate to severe frontal or

near-frontal crashes. The air bag will only inflate if the velocity of the

impact is above the designed threshold level. When impacting straight into a

wall that does not move or deform, the threshold level is between

and

mph

(17

and

km/h).

However, this velocity threshold depends

the

option content of the vehicle and may be several miles-per-hour faster or

slower. In addition, this threshold velocity will be considerably higher if

the

vehicle strikes an object such as a parked car which will move and deform

on impact. The air bag is also not designed to inflate in rollovers, side

impacts, or rear impacts where the inflation would provide no occupant

protection benefit.

In any particular crash, the determination of whether the air bag should have

inflated cannot be based solely on the level of damage on the vehicle(s).

Inflation

determined by the angle

the impact and the vehicle's

deceleration, of which vehicle damage is only one indication. Repair cost is

not a good indicator of whether an air bag should have deployed.

What makes an air bag inflate?

In a frontal impact of sufficient severity, the air bag sensing system detects

that the vehicle is suddenly stopping as a result of a crash. The sensing

system triggers a chemical reaction

the sodium azide sealed in the

inflator. The reaction produces nitrogen gas, which inflates the cloth bag.

The inflator, cloth bag, and related hardware are all part of

the

air bag

inflator module packed inside the steering wheel.

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Chevrolet 1994 Astro Bedienungshandbuch Seite 39

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