Audi Braking Guard - Audi A5 2009 Owner's Manual

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Fig. 149 Sheering out
and stat iona ry vehicle
If a vehicle t hat has been detected by t he ACC system t urns off o r
sheers out , and there is a stationary vehicle ahead of that vehicle ,
the ACC system does not respond to the stationary vehicle
::;> page 136, fig. 148 and ::;> fig. 149. •
Audi braking guard
Ap pli es to vehic les: with adaptive cruise cont rol
Description
Audi braking guard warns you of a threatening collision
with a vehicle ahead.
Cont rols and equip-
ment
Fig. 150 Display in th e
inst rument cluster
The Audi braking guard is active from a speed of app rox . 20 mph
(30 km/h) and works within t he system limits ::;> page 735even when
the adaptive cruise control is deactivated .
A radar sensor is built into the front of the vehicle ::;:. page 123,
fig. 130. The system is intended to measure the distance t o reflec-
tive surfaces. If a measurement is not possible, the system does not
respond .
When the measurement has taken place, the system can assess a
hazardous situation, when a vehicle ahead sudden ly brakes or when
your own vehic le is driving at high speed towards a much slower
vehicle ahead. As soon as the system assumes that a possible colli -
sion with the vehicle ahead can only be avoided by immediate al l-
out braking or by an avoiding maneuver, a warning appears.
The syst em has a pre-set response time to be able to warn in good
time . This system response time is automatically reduced if you
accelerate act ively, for example to join a highway . Braking, trans -
verse acceleration and the steering angle can lead to a reduced
system response time . The warning is deact ivated if you begin to
overtake with ful l acceleration.
The system draws your attention to two different hazardous situa -
tions:
Di s t a nce
The distance warning is issued in the event of inadequate d istance
to the vehicle ahead a period of more than
5
seconds. If the distance
is less than 30 feet (9 meters) at 50 mph (80 km/h), for example, an
optical display is faded in on the instrument cluster ::;> fig. 150.
If the vehicle ahead brakes sharply, a collision cannot be avoided,
even in the case of an immediate response. In this case, increase t he
distance to the vehicle ahead .
S p ee d
If there is a much slower vehicle ahead in your lane, or if the ve hicle
ahead brakes sharply, the Audi braking gua rd calculates the point
from which a collision can only be avoided by al l-out braking or by _..
Vehicle care
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irechnical data