Audi Q7 - Function; Information Processing; Functions

25
Based on the information supplied by the ABS control unit J104,
the vehicle knows its own speed. On the basis of this information,
the ACC control unit J428 and ACC control unit 2 J850 compute the
speeds of the vehicles ahead. The following information is there-
fore known to Audipresensefront
1)
:
• Distance to vehicles ahead.
• Speed of vehicles ahead.
• Speed of own vehicle.
Function
The radar sensors continuously scan the area ahead of one's own
vehicle. Audi pre sense front is active even if the ACC system is not
active. The ACC control unit J428 and ACC control unit 2 J850
evaluate and conditions the signals and determine from this data
the distance to vehicles within the detection range in front of the
vehicle.
Information processing
The master control unit (ACC control unit J428) evaluates the
information and transmits corresponding signals on the data bus.
Other bus users receive the signals and are able to take appropriate
action.
In addition, Audipresensefront utilises the information
provided by front camera for driver assistance systems R242 (refer
to Fig.637_023 on page24).
The classes and widths of the vehicles ahead can be determined
more accurately using the additional information provided by the
front camera.
1)
A precondition is that the following vehicles are within the detection range of the radar sensors.
Audipresensefront only utilises the information provided by the
front camera if the light and visibility conditions are good enough.
This means that in poor visibility conditions such as darkness or
fog, where the front camera cannot provide reliable image data,
only the data generated by the radar sensors is used for Audi pre
sense front functions.
Audipresensefront reacts only to vehicles which are travelling in
the same direction and to vehicles which have stopped or are
stationary. Turn assist is an exception here. If turn assist is avail-
able, the system also reacts to oncoming trac.
Functions
Audi pre sense front has the following functions:
A In the event of an impending collision, the driver is warned and assistance is provided by automatic braking
1)
or by boosting
1)
the
braking pressure applied by the driver thereby gaining additional reaction time and reducing the vehicle's speed.
B Turn assist - response to oncoming trac
C Evasion assist - response to moving, stopped or stationary vehicles
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