gf9160w2000b

Recognition of head-on collision, function

Type gf · topic 91.60 · version 0101 · 1999-06-15

Applies to: BODY 972.899 with CODE (SA5) Driver's airbag

Where it sits

Function group 3 Body › 91 Seats, bunks, restraint systems › 91.60 Airbag, pedestrian protection — Series 972 (models 899)

GF91.60-W-2000B

Recognition of head-on collision, function

24.10.97

BODY 972.899 with CODE (SA5) Driver's airbag

Function

The heart of the supplemental restraint system (SRS) is the airbag control module (A40). Among other items it has a head-on collision recognition feature. Accidents deviating 30° to the vehicle longitudinal axis are recognized. The airbag control module monitors the motion of the vehicle. During an accident the vehicle decelerates rapidly (negative acceleration). In such cases it is necessary to differentiate between an accident and intended emergency braking maneuver. The actuation threshold is set to a relative change in speed of 20 km/h upon

impact with a flat, immovable barrier, while the non-actuation threshold is defined to be a relative change in speed of 15 km/h. Triggering is possible between these values.
In order to correctly evaluate the deceleration two acceleration sensors are installed in the airbag control module, whose signals are subjected to different signal processing.
If the deceleration is recognized as an accident, the airbag and emergency tensioning retractors are activated.

Supplemental restraint system (SRS)
Location of components

GF91.60-W-0002-01B

Triggering supplemental restraint system (SRS), function

GF91.60-W-2001B

Airbag control module, location/purpose

GF91.60-W-4000A

Referenced documents