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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. J428 and 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 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 utilizes the information
provided by Driver Assistance Systems Front Camera R242
(refer to Fig. 637_023 on page 22).
The classes and widths of the vehicles ahead can be deter-
mined more accurately using the additional information
provided by the front camera.
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
braking pressure applied by the driver thereby gaining additional reaction time and reducing the vehicle's speed.
B
Turn assist - response to oncoming traffic
C
Collision avoidance assistance - response to moving, stopped or stationary vehicles
A precondition is that the following vehicles are within the detection range of the radar sensors.
1)
Based on the information supplied by ABS Control Module
J104, the vehicle knows its own speed. On the basis of this
information, J428 and J850 compute the speeds of the
vehicles ahead. The following information is therefore
known to Audi pre sense front
•
Distance to vehicles ahead.
•
Speed of vehicles ahead.
•
Speed of own vehicle.
Audi pre sense front only utilizes 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 travel-
ing in the same direction and to vehicles which have
stopped or are stationary. Turn assist is an exception here.
If turn assist is available, the system also reacts to oncom-
ing traffic.
:
1)
or by boosting
the
1)
1)
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