Impact Detection, Basic Function - GF91.60-P-1002A

Model All (4xWD) 

Model All (CAR) 

Overview 

This document contains information on:

• General 
• Function requirements 
• Function 

General 

The impact detection records accident events. By evaluating the signals from various sensors, it is possible to differentiate between individual types of collision and to record the level of vehicle deceleration. The corresponding restraint equipment is triggered to match the situation.

Function requirements 

• Circuit 15R ON

Function 

For impact detection, the Supplemental Restraint System (SRS) control unit typically evaluates the signals from the following sensors:

• Front acceleration sensors on vehicle
• Acceleration sensors on B-pillars
• Pressure sensors in front doors
• Pressure sensors in rear doors (depending on body variant involved)

The evaluated sensors can also be integrated into the SRS control unit.

The lateral acceleration of the vehicle is also evaluated. This is detected by an acceleration sensor in the SRS control unit.

The SRS control unit differentiates between the following accident scenarios by evaluating sensor data:

• Frontal impact
• Side impact
• Rear impact
• Rollover (along vehicle's longitudinal axis)

In many vehicles, the traffic area in front of the vehicle is monitored with radar assistance. This makes it possible to detect an imminent collision at an early stage. The respective deployment points of the restraint equipment are adapted in accordance with the situation. On vehicles equipped with the Driving Assistance Package, the traffic area to the rear of the vehicle is also monitored.

	Further basic functions
	Traffic area monitoring, basic function	Model all (CAR)	GF54.71-P-1000A
	Supplemental restraint system control unit, basic function		GF91.60-P-9890A
	Supplemental restraint system pressure sensors, basic function	Model all (CAR)	GF91.60-P-2008A
	Supplemental Restraint System acceleration sensors, basic function	Model all (CAR)	GF91.60-P-2019A