gas which is forced through the diffuser screen into the
air bag. The diffuser screen serves as a filter to remove
cinders and also helps cool down the gas temperature
and reduce the gas generation noise. A shorting pin is
provided in the connector portion of the squib.
Whenever the air bag module is removed, the shorting
pin makes a short circuit across the terminals to prevent
flow of current caused by static electricity to the squib.
NOTE
The cross sectional view of the inflator was plotted on
the basis of a sketch prepared by Moton Thiokol
Diffuser
Igniter
To air bag
. Connector lock
utomotive Products Division.
Gas generant
Base
Shorting clip
19N0233
6-20 INTERIOR - Supplemental Restraint System (SRS)
Inflator
The inflator consists of a squib, igniter, gas generants,
diffuser screen, etc. contained in an aluminum container.
It is mounted in the air bag module housing.
The bottom of the inflator is provided with an electrical
connection to which an ignition current is supplied. If
current is supplied to the squib, a small amount of
explosive in the squib is burnt causing the igniter to burn,
and the resultant heat burns the gas generants.
Combustion of the generants rapidly produces nitrogen
Air bag deployment operation
(in case of 50 km/h (30 mph) frontal impact)
(1) OPERATION FOR APPROXIMATELY 15 MILLISECONDS
AFTER THE COLLISION
If a strong impact produced by a collision is detected by either
of the front impact sensors and the safing impact sensor in
approximately 10 milliseconds after the collision, the SRS
diagnosis unit will supply an ignition signal to the squib.
In approximately 3 milliseconds after the ignition signal has
been supplied to the squib, gas generation will begin.
: Nitrogen gas
: Flame
Squib
To air bag
Diffuser screen
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