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The all-wheel
drive
concept is designed for high
engine power
.
Your vehicle is
exceptionally
pow-
erful and has excellent driving character istics
both under normal driving conditions and on
snow and ice. Always read and follow safety pre-
cautions
<=>
,&.
Winter tire
s
When driving
in
the winter, your vehicle with all-
wheel drive has an advantage, even with regular
tires. In winter road conditions it may be advisa-
ble to mount w inter tires (or all-season
tires)
for
improved
driveability and braking:
these
tires
must be mounted on
all four
wheels.
See also
<=>
page 224, Winter tires.
Tire chains
Where tire chains are mandatory on certain
roads, this normally also applies to vehicles with
all-wheel drive
<=>
page 224, Snow chains.
Replacing wheels/tires
Vehicles with a ll-wheel drive must a lways have
tires of the same size. Also avoid tires with differ-
ent tread depths. For details see page
<=>
page 216, New tires or wheels.
Off-Road driving?
Your Audi does not have enough ground clear-
ance to be used as an off-road vehicle. It is there-
fore best to avoid
rough
tracks and
uneven
ter-
rain as much as possible. Also refer to
<=>page
177
.
A
WARNING
Always adjust your
driving
to
road
and traffic
conditions. Do not let
the
extra safety afford-
ed by
all-wheel
drive
tempt
you
into
taking
extra risks.
-
Although the all-wheel dr ive is very effec-
t ive,
always
remember
that
brak ing
capacity
is limited
by tire traction.
You
should there-
fore
not drive at excessive speeds on icy or
slippery
road
surfaces.
-
On
wet road surfaces,
be
careful not to dr ive
too fast because the
front
whee ls could be
-
gin
to slide on top of the water (aquap lan-
ing). If this shou
ld
occur,
you will have no
Smart
Technology
warning from a sudden increase in engine
speed as with a front-wheel drive vehicle.
Always drive at speeds which are suited to
the road conditions
-
risk of crash.
Energy
management
Starting ability is optimized
Energy management controls the distribution of
electrical energy and thus optimizes the availa-
bility of electrical energy for starting
the
engine.
If a vehicle with a conventional energy system is
not driven for a long pe riod of
time, the
battery
is
d ischarged by idling
current consumers
(e.g
.
immobil izer). In certain
circumstances
it
can
re-
su
lt
in
there
being
insufficient energy available to
start the engine.
Intelligent
energy management
in your vehicle
hand les
the distribution
of electrical energy.
Starting ability
is
markedly improved and
the life
of the battery is extended.
Basically,
energy management
consists of
bat-
tery
diagnosis,
idling
current
management
and
dynamic
energy
management.
Battery diagnosis
Battery diagnosis continuously determines the
state of the battery
.
Sensors
determi ne battery
vo
lta
ge, battery current and
battery
tempe ra-
tu re.
This
determines the current state of charge
and the
power
of the battery.
Idling current management
Idling current management
reduces
energy con-
sumption whi le
the
vehicle is standing.
With the
ignition switched off,
it
contro ls
the
energy
sup-
ply to the various electrical components.
Data
from battery diagnosis is considered.
Depending
on
the
battery's state of charge, indi-
vidual
consumers
are gradua lly
turned
off to
pre-
vent excessive discharge of
the
battery and
thus
maintain starting capability
.
Dynamic energy management
While the vehicle is being driven, dynamic energy
management
distr ibutes
the
energy generated
..,.
175
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