2012 AUDI A7 Owners Manual

Adaptive cruis e control an d bra kin g guard 79
Adaptive cruise control
and braking guard
Introduction
App lies to vehicles: with adaptive cruise co ntrol
The adaptive cruise control system assists the
driver by regulating vehicle speed and helping
to maintain a set distance to the vehicle
ahead, within the limits of the system. If the
system detects a moving veh icle up ahead,
adaptive cruise control can brake and then ac ­
celerate your vehicle . T his helps to make dr iv­
ing more comfortable both on long highway
stretches and in stop-and-go traffic.
Aud i brak ing guard can warn you about an im­
pending col lision w ith a vehicle up a head that
is slower or has s lowed down and start slow­
ing your vehicle down with the brakes
¢page 85.
Adaptive cruise control and Audi brak ing
guard have technica l limitations that you
must know, so p lease read this sect ion care­
fu lly, understand how the system works and
use them properly at all times.
General information
General information
Ap plies to vehicles: with adaptive cruise co ntrol
Fig. 81 Fr ont of th e ve hicle : sensors an d video camera
The areas that contain the radar and ultrason­
ic sensors and the video camera
¢ fig. 81
must never be covered by stickers, or other
things or coated with dirt, insects, snow or ice
that will interfe re with the adapt ive cru ise
control system and Audi braking guard . Re­
move snow with a hand brush and remove ice with a de-icing spray that does not contain
solvents.
T
he function of the Adaptive cruise cont ro l
system and A udi braking guard is limited un­
der some conditions.
- Objects can on ly be detected when they are
w ith in sensor range
¢page 81, fig. 84 .
-The system has a limited ability to detect
objects that are a shor t distance ahead,
off
to the side of your vehicle or moving into
your lane from the front or moves into your
lane from the side .
-When driving through curves
¢ page 80.
- Some kinds of veh icles are hard to detect;
for examp le motorcycles, veh icles with high
ground clearance or overhanging loads may
be detected when it is too late or they may
not be detected at a ll.
- Stationa ry objects
c::> page 80.
A WARNING
Improper use of the adaptive cruise con­
trol can cause collisions, other accidents
and serious personal injury.
- Never let the comfort and convenience
that adaptive cruise control and Audi brak ing guard offer distract you from the
need to be alert to traffic conditions and
the need to remain in full control of your
veh icle at a ll t imes,
- Always remember that the adaptive
cru ise cont rol and Aud i brak ing guard
have lim its -they will not s low the vehi­
cle down or maintain the set d istance
when yo u drive towards an obstacle or
someth ing on or near the road tha t is not
mov ing, such as vehicles stopped in a
traffic jam, a stalled or disabled vehicle.
If registered by the radar sensors, vehi­
cles or obstacles that are not moving can
trigger a collision warning and if con­
f irmed by the video camera, an acute col­
lision warning.
- Always remember that the adaptive
cru ise contro l cannot detect a vehicle
that is driving towards you in your traffic
-
lane and that it cannot detect narrow ..,.

80 Adaptive cruise control and braking guard
vehicles such as motorcycles and bicy­cles.
- The adaptive cruise control system can ­
not detect people, animals and cannot
detect objects or traffic that crosses your
lane of travel.
- Never drive at speeds that are too fast
for traffic, road and weather conditions.
- Never use adaptive cruise control when
you cannot drive safely at a steady speed, including on winding roads or
when road conditions are poor (for exam ­
ple, in construction sites, on ice, gravel,
in fog, heavy rain or on wet roads that in­
crease the risk of hydroplan ing).
- Never follow a veh icle so closely that you
cannot stop your vehicle safely. The
adaptive cruise control cannot slow or
brake the vehicle safely when you follow
another vehicle too closely . Always re­
member that the automatic braking
function cannot bring the vehicle to a sudden or emergency stop under these
conditions.
- Never rest your foot on the accelerator
pedal, especially when the adaptive
cruise control is being used. Pressure on
the accelerator will override the adaptive cruise control braking function and pre­
vent the brakes from being applied when adaptive cruise contro l detects a situa­
tion when the brakes must be applied.
- Never use adaptive cruise control when
the radar sensors cannot accurately de­
tect vehicles moving in traffic. The radar
sensor's vision can be reduced by heavy
rain, ice, snow, heavy road spray and re­
flections from guard rails, tunnel entran­
ces, etc. These and similar conditions can
prevent vehicles from being accurately
detected and in some cases they may not
be detected at all .
- Always turn off adaptive cruise control
when entering turn lanes, exit lanes and
construction zones or in similar situa­
tions because the vehicle will automati­ cally accelerate to the stored speed when
the road ahead is clear. -
To prevent unintended operation, always
switch ACC off when it is not being used.
(D Note
The sensors can be moved by impacts or
damage to the bumper, wheel housing and
underbody. Damage in these areas could
change the way the adaptive cruise control
system and Audi braking guard work to­
gether . Have your authorized Audi dealer
check to make sure that the adaptive
cruise control system is working properly if
your vehicle had a minor frontal impact or
was damaged in the area of the sensors.
In curves
Applies to vehicles: wi th adaptive cruise control
Fig. 82 Exampl e: dri ving into a curve
When driving into a curve c:::> fig. 82 and out of
a curve, the adaptive cruise control may react
to a vehicle in the next lane and apply the brakes. You can override or prevent the brak­
ing by pressing the accelerator pedal briefly.
Stationary objects
Applies to vehicles: with adaptive cruise control
Fig. 83 Exam ple: object changing la nes a nd stat io na ry
ob ject .,..

Adaptive cruise control and braking guard 81
The adaptive cruise control system only reacts
to objects that are moving or that the system
has already detected and reg istered as mov ­
ing.
Adaptive cruise control
Description
Applies to vehicles: with adaptive cruise control
Fig. 84 Detection range
What can adaptive cruise control do?
The adaptive cruise control system uses video,
radar and ultrasound. Moving vehicle ahead
can be recognized up to about 650 feet (200 m) away.
On open roads with no traffic, adaptive cruise
control works like a regular cruise control sys­
tem. The stored speed is maintained. When
approaching a moving vehicle detected up
ahead, the adapt ive cruise control system au­
tomatically slows down to match that vehi­
cle's speed and then maintains the distance
that the driver previo usly stored. As soon as
the system does not detect a vehicle up
ahead, adaptive cruise control accelerates back up to the stored speed.
In stop-and-go traffic, adaptive cruise control
can brake until the vehicle stops if this is pos­
sib le within the systems' limits and capabili­
ties. ACC will not make an emergency stop.
Pull the lever
c:> page 81, fig. 85 towards
you into position @to reactivate ACC, the ve­
hicle will move forward when the vehicle in
front of you starts moving aga in. You can also
depress the accelerator to move forward
again
¢ page 82.
Which functions can be controlled?
When you switch adaptive cruise control on,
you can set the current speed as the " contro l
speed"
c::>page 81, Switching on and off.
When driving, you can stop cruise control
¢ page 83 or change the speed ¢ page 83
at any time.
You can also set the distance to the object ahead and set the adaptive cruise control d riv­
ing program
¢ page 84.
Switching on and off
Applies to vehicles: with adaptive cruise control
Fig . 85 Operating lever: switching on/off
Fig. 86 Inst rument cluster: adaptive cruise control
You can set any speed between 20 mph and
95 mph (30 and 150 km/h) .
An additional indicator appears in the Head­
up Display*.
Switching adaptive cruise control on
.. Pull the lever toward you into position (D
r=> fig. 85. ACC standby appears in the in­
strument cluster display.
~ 9 I ..,. ID

82 Adaptive cruise control and braking guard
Setting the speed and activating
regulation
.. To set the current speed, press the I SET !
button ¢ fig. 85. The set speed is shown in
the tachometer @and in the display
¢
fig . 86. You must also press the brake
pedal when the vehicle is stopped.
Switching adaptive cruise control off
.. Push the lever away from you into position
@ until it clicks into p lace. The message
ACC off appears.
Indicator lamps and messages in the instru­
ment cluster display inform you about the cur­
rent system status and settings.
@ Indicator lights
II -adaptive cruise control is switched on. No
vehicles are detected up ahead. The stored
speed is ma intained.
I -A moving vehicle is detected up ahead.
The adaptive cruise control system regulates
the speed and distance to the moving vehicle
ahead and acce lerates/brakes automat ically.
fij-adaptive cruise control is switched on. A
moving vehicle up ahead was detected. Your
vehicle remains stopped and will not start driving automatically.
I-When a utomat ic brak ing is not able to
keep enough distance to a previously detected
moving vehicle up ahead, you must take con­
trol and brake¢
page 83, Prompt for driver
intervention.
© Display
If adaptive cruise control is not shown in the
display, you can call it up with the multifunc ­
tion steering wheel buttons¢
page 22.
Based on the symbo ls in the display, you can
determine if the system is main taining a dis­
tance to the vehicle ahead and what that dis­
tance is .
No vehicle -No vehi cle ahead was detected.
White vehicle -A vehicle ahead was detected.
Red vehicle -Prompt for the driver to take ac­
tion ¢
page 83 .
Both arrows on the scale © indicate the dis ­
tance to the vehicle ahead. No arrow appears
when the vehicle is on an open road and the re
is no object ahead. If an object is detected
ahead, the arrow moves on the scale.
T he green zone on the scale shows the stored
distance . For information on changing the
stored distance ¢
page 84. If the distance
selected is too close or may soon become too
close, the arrows move into the red zone on
the scale.
A WARNING
Improper use of the adaptive cruise con­
trol can cause collisions, other accidents
and serious personal injur ies.
- Pressing the
!SET ! button when driv ing at
speeds below
20 mph (30 km/h), w ill au­
tomatically accelerate the vehicle to
20
mph (30 km/h), which is the minim um
speed that can be set.
(D Tips
-If you switch the ignit ion or the adaptive
cruise contro l off, the set speed is e rased
from the system memory.
- You cannot switch the Electron ic Stabili­
zation Program (ESP) to the SPORT mode
when adaptive cruise control is sw itched
on.
Driving in stop-and-go traffic
Applies to vehicles: with adaptive cruise control
The adaptive cruise control system also as­ sists you in stop-and-go traffic. If a previous
detected vehicle ahead stops, your vehicle will
brake to a stop, within the limits of the sys­
tem.
.. To resume driving with adaptive cruise con­
trol, tap the acce lerator pedal or
.. Pull the lever toward you into position @
¢ page 81, fig. 85. .,.

Adaptive cruise control and braking guard 83
@ Tips
-If adaptive cruise contro l is active and
your vehicle does not start dr iving as ex ­
pected after pulling the lever once, you
can start out aga in by tapping the accel­
erator pedal.
- If an obstacle is detected when your ve­
hicle starts dr iv ing, the system w ill
prompt you to take over
c:> page 83.
Your vehicle w ill dr ive more slowly when
starting. This may also happen in some
situations when there no obstacle is ap ­
parent .
Interrupting cruise control
App lies to vehicles: with a daptive cruise co ntrol
Requirement : adaptive cruise control must be
switched on.
Overriding cruise control
• To accelerate manually, pull the lever to­
ward you into position@¢
page 81, fig. 85
and hold it th ere . The message ACC override
appears . Or
• press the accelerator peda l.
• To resume cruise control, release the lever
or take your foot off the accelerator pedal.
Canceling cruise control while driving
• Move the lever into position @. Th e mes­
sage
ACC standby appears. Or
• press the brake pedal.
• To resume the stored speed, move the lever
into position @.
Canceling cruise control when stopped
• Push the lever away from you into position
@ . The message
ACC standby appears.
• To resume cruise control, press the brake
pedal and pull the lever toward you into po­
sition @.
A WARNING
Improper use of the adaptive cruise con­
trol can cause coll is io ns, othe r acc idents
and ser ious personal inj uries. -
Never resume the stored speed if the
speed is too high for prevailing road,
traffic or weather conditions.
Prompt for driver intervention
Applies to vehicles: wit h adapt ive c ruise contro l
Fig. 87 Instrument cluste r: req uest for driv er interve n­
tion
In certain situations, the system will prompt
you to take action . For example, braking by
the adapt ive cruise control system is not
enough to maintain enough distance to the
vehicle ahead.
The indicator light
I and the symbol in the
display will warn you about the situation
c:> fig. 87. You w ill also hear an acoustic signal.
- Press the brake pedal to slow your vehicle
down .
Changing the speed
Applies to veh icles: w it h adaptive c ru ise contro l
0
f
• 0
Fig. 88 Operatin g lever: changing the speed
• To incr ease or reduc e the speed in incre­
ments,
tap the lever up or down.
• To increase or reduce the speed qu ickly,
hold the lever up or down until the red LED .,._

84 Adaptive cruise control and braking guard
@ reaches the desired speed ¢ page 81,
fig. 86.
Setting the distance and driving
program
App lies to vehicles: with adaptive cruise control
Fig. 89 Opera ting lever: set ting the distance
The distance at which the adaptive cruise con­
trol fo llows a vehicle in front is determined by
time intervals. A time interval to a vehicle in
front is established and maintained. This pro­
duces a speed-dependent interval. The higher
the speed, the greater the safety interval in
yards (meters)
i::> ,& .
Setting the distance
• Tap the switch to disp lay the current set dis­
tance
i::> fig. 89.
• To increase or reduce the distance by incre­
ments , tap the switch again to the left or
right . The distance between the two vehicles
wi ll change in the instrument cluster dis­
play.
Setting the driving program
• Select in the MMI:
!CAR I function button>
Car Systems control button > Driver assist>
adaptive cruise control
> Driving program .
Setting the distance
When approaching a moving vehicle up ahead,
the adaptive cruise control system automati­
cally brakes to match that object's speed and
then maintains the stored distance. When this
happens , the actual d istance may briefly be
less than the stored distance.
If the vehicle
ahead accele rates, adaptive cruise control will
also accelerate up to the stored speed. T
he higher the speed, the g reate r the distance
in yards (meters)
i::> .& . Th e Distance 3 setting
is recommended.
T he distances provided are specified va lues .
Depending on the driving situation and the
how the vehicle ahead is driving, the actua l
distance may be more or less than these tar­
get distances .
c::::,_c::::, ___ Distance 1: This setting corre-
sponds to a distance of 92 feet/28 meters
when traveling at 62 mph (100 km/h), or a
t ime interval of 1 second.
c::::, __ c::::, __ Distance 2: This setting corre­
sponds to a distance of 118 feet/36 meters
when traveling at 62 mph (100 km/h), or a
time interval of 1.3 seconds.
c::::, ___ c::::,_ Distance 3: This setting corre-
sponds to a distance of 164 feet/SO meters
when traveling at 62 mph (100 km/h), or a
t ime interval of 1.8 seconds.
c::::, ____ c::::, Distance 4: This setting corre-
sponds to a distance of 210 feet/64 meters
when traveling at 62 mph (100 km/h), or a
t ime interval of 2.3 seconds.
Setting the driving program
You can select Dynamic , Standard or Comfort
driving programs. Depending on the selected
driving program and distance, driving behav ­
ior when accelerating wi ll vary from dynamic
to comfortab le.
A WARNING
Following other vehicles too closely in­
creases the risk of collis ions and ser ious
personal injury .
- Sett ing short distances to the traffic
ahead reduces the time and distance
availab le to bring your vehicle to a safe
stop and makes it even more necessary
to pay close attention to traffic .
-
-Always obey applicable traffic laws, use
good judgment, and select a safe follow­
ing distance for the traffic, road and
weather conditions.

Adaptive cruise control and braking guard 85
@ Tips
- Distance 3
is set automatically each time
you switch the ignition on.
- Your standard settings are automatically
stored and assigned to the remote con­
trol key being used.
Audi braking guard
Descript ion
Applies to vehicles: with adaptive cruise contro l
Fig. 90 Instrument cluster: approach warning
Audi braking guard uses radar sensors and a
video camera. It is active at speeds above
about 6.2 mph (10 km/h) and also works
within system limits when adaptive c ruise
control is switched off.
On vehicles w ith adaptive cru ise control and
Audi side assist (Aud i pre sense plus), system
functions also engage when a collision is im­
minent
c::> page 182.
What can Audi braking guard do?
When detected in time, the system can assess
situations when a vehicle ahead brakes sud­
denly or if your own veh icle is traveling at a
h igh speed and approaching a veh icle up
ahead that is moving more slowly . Audi brak­
in g guard does not react if it cannot detect
the situation.
The system advises you of various s ituations:
- The
distance warning is given if you are too
close to the vehicle ahead for a long time. If
the vehicle ahead brakes sharply, you will not be able to avoid a coll is ion . The ind icator
light
I in the disp lay comes on. Take imme- diate action to avoid
the collision and in­
crease the distance to the vehicle up ahead.
- The
approach warning is given when a de­
tected vehicle up ahead in your lane is mov­
ing much more slowly that you are or if it
brakes sharp ly. When this warning is given,
it may only be possible to avoid a collision
by swerving or braking sharply. The indicator
light
I and the symbol in the display will
warn you about the danger
c::> fig . 90 . You
w il l also hear an acoustic signal.
If you do not react fast enough or do not react
at all to the situation, Audi braking guard w ill
intervene by braking and the message
braking
guard intervention
will appear.
- If a collision is imminent, the system will
first provide an
acute warning by braking
sharply.
- If you do not react to the acute warning, Au­
di braking guard will brake w ith increased
force in severa l stages to reduce the speed
in a poss ible collis ion. On veh icles with
adaptive cruise control and Audi side assist
(Audi pre sense plus), the system can brake
with increasing force up to maximum dece l­
eration shortly before a sensed collision
c::>page 182.
-If the Audi braking guard senses that you
are not brak ing hard enough when a colli­
sion is imminent, it can increase the braking
force.
Audi braking guard takes the driver's reaction
time into consideration in order to provide
timely warnings. The system reaction time de­
creases automatically in some situations, for
example when it detects acce lerator pedal use
or steering input . The Audi braking guard in­
tervent ion stops in certa in situations, for ex­
amp le if you press the accelerato r pedal to
pass the vehicle moving ahead of you in your
lane .
Which functions can be controlled?
You can switch Audi braking guard and the
distance/approach warning on or
off i n the
MM I ¢ page 86, Settings in the MMI.

86 Adapti ve crui se co ntrol a nd bra king guard
& WARNING
The Audi braking guard is an assist system
and cannot prevent a collision by itself.
The driver must always intervene . The driv­
er is always responsible for braking at the
correct time.
- Always pay close attention to traffic, even when the Audi braking guard is
switched on. Be ready to intervene and
be ready to take comp lete control when­
ever necessary. Always keep the safe and
legal distance between your vehicle and
vehicles up ahead.
- Audi braking guard works within limits
and w ill not respond outs ide the system
limits, for examp le when approaching a
stopped vehicle or stationary obstacle
(end of a traffic jam or vehicle that has
broken down in traffic).
- Always remember that the radar sensor
for the Audi braking guard works only
within defined detection and range limits
that may prevent the proper detection of
other vehicles.
- The radar sensor's function and range
can be reduced by rain, snow and heavy
spray. moving vehicles up ahead may not
be promptly detected or may not be de­
tected at all.
- Reflective surfaces includ ing crash barr i­
ers or tunnel entrances may impair the
function of the radar sensor .
(D Tips
Lack of attention can cause coll is ions, oth­
er accidents and ser ious personal injuries.
- You can stop the Audi braking guard in- tervention w ith increas ing braking force
by applying the brakes yourself or by ac­
celerat ing rapidly .
- Audi braking guard error messages
.:> page 86.
Settings in the MMI
Applies to vehicles: wit h adaptive cruise contro l
., Sele ct: I CAR I function button > Car system s
contro l button > Driv er a ssis t> Audi brak ­
in g gu ard .
S ys tem -
Switch Audi braking guard On and
Off. When you switch the ignit io n on, the
message
Audi brakin g gu ard off appears in
the instr ument cluster disp lay if the system is
switched off.
Earl y wa rnin g -The distan ce and approach
warnings in the d isplay can be switched
On /
Off .
(D Tips
-Yo ur settings are automatically stored
and assigned to the remote contro l key
being used at the times the settings are
made.
- If you switch the ESP to sport mode, A u­
di braking guard switches off a utomati ­
cally¢
page 186.
Messages
Applies to vehicles: wi th adaptive c ruise control
ACC unav ailable
ACC and braking guard: unavailabl e
The system cannot detect moving vehicles up
ahead co rrectly and is sw itched off . The sen­
sors have been displaced or a re not working
properly. The Audi pre sense functions may a l­
so be affected.
ACC: unava ilable at this time. No sensor vi­
sion
A CC and b raking gu ide: un available at this
time . No sensor vision
This message appears if the sensor view is ob­
structed, for examp le by leaves, snow, heavy
spray or d irt. Clean the sensors¢
page 79,
fig. 81.
ACC: un availabl e at this time. Incline too
steep