document_0900452a81b1b9de.book Seite 142 Donnerstag, 26. Juli 2007 9:16 09
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adaptive cruise control (ACC)
Applies to vehicles: with adaptive cruise control
Audi braking guard
Stationary vehicles
Applies to vehicles: with adaptive cruise control
Description
Audi braking guard warns you in case of an impending
collision with a vehicle in front.
Fig. 154 Vehicle
turning off and vehicle
stationary
Fig. 156 Instrument
cluster: Display
Audi braking guard is active at speeds above approximately 30 km/h
and operates within the system limitations ⇒ page 140 even when
the adaptive cruise control is deactivated.
Fig. 155 Vehicle
changing lane and
vehicle stationary
The radar sensor is fitted at the front of the vehicle ⇒ page 130,
fig. 137. The system requires reflecting surfaces in order to be able
to measure the distance. If the ACC is unable to measure the
distance it will not respond.
If a vehicle detected by the ACC system turns off or changes lane
and another stationary vehicle is located in front of that vehicle, the
ACC system will not react to the stationary vehicle ⇒ fig. 154 and
⇒ fig. 155.
Once the system has measured the distance, it can assess a
dangerous situation where a vehicle in front brakes suddenly or you
are driving fast and approach a vehicle travelling at a much slower
speed. The system warns you as soon as it anticipates that a poten-
tial collision with the vehicle in front can only be avoided by hard
braking or by taking evasive action.
The system has a preset response time so that it can warn you in
time. In certain situations, the system response time will be reduced
dynamically, e.g. when you are accelerating onto a motorway.
Braking, lateral acceleration and steering angle are other factors
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