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The all-wheel drive concept is designed fo
r
high
engine power. Your vehicle is exceptionally pow-
erful and has excellent driving characterist ics
both under normal dr iving condit ions and on
snow and ice. Always read and fo llow safety pre-
cautions
<=>
,&.
Winter t
ires
When driving in the winter, your vehicle with a
ll-
wheel drive has an advantage, even with regular
tires. In winter road conditions it may be adv isa-
ble to mount w inter tires (or all-season tires) for
improved driveab ility and brak ing
:
these tires
must be mounted on
all four
wheels.
See also
<=>
page
220,
Winter tires
.
Tire
chains
Where tire chains are mandatory on certain
roads, this normally also applies to vehicles wit
h
all -wheel drive
<=>
page
220,
Snow chains
.
Replacing wheels
/
t ires
Vehicles with all-whee
l
dr ive must always have
tires of the same size. Also avoid tires with differ-
ent tread depths. For details see page
<=>
page 212, New tires or wheels.
Off-Road
driving?
Your Aud
i
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 t raff ic
conditions. Do not let the extra safety affo rd-
ed by all-wheel drive temp
t
yo
u
into ta king
extra risks.
-
Although the all-whee
l
drive is very effec-
t ive, a lways remember th at br
ak
ing capac ity
is limited by tire traction.
You
should t here-
fore not drive at excess ive speeds on icy or
slippery road surfaces.
-
On wet road surfaces, be caref
ul
no
t
to drive
too fast because
t
he front wheels co uld be
-
gin to slide on top of the water (aq uaplan-
ing). If this shou ld occur, you wi
ll
have no
Intellig
e
nt Technology
warn ing from a s udden increase in engine
speed as w ith a front-wheel drive vehicle.
Always drive at speeds which are suited to
the road conditions - risk of crash
.
Energy
management
Start ing ability is optimized
Energy management controls the distribution of
elec trical energy and thus optimizes the availa-
bility of ele ctrical energy for star
t
ing the engine.
If
a vehicle with a conventiona
l
energy system is
not dr iven fo
r
a long pe riod of time,
t
he batte ry is
discharged by id ling curre nt cons umers (e.g.
im-
mobili ze r). In
cert
ain circumstances
it
can res ult
in the re being insuffi cien
t
energy ava ilable to
start the engine
.
Intellige nt energy manageme nt in yo
ur
vehicle
hand les the distri
but
ion of elec
t
rical energy.
Start ing ability is markedly improved and the life
of the battery is extended
.
Bas
icall
y, energy managemen
t
cons ists of bat-
tery
diagnosis,
idling current management
a nd
dynamic energy management.
Battery diagnosis
Battery d iagnosis con
t
inuously dete rmines the
state of the bat
t
ery. Sensors de
t
ermine battery
vo ltage, bat
t
ery
cu
rren
t
and batte ry tempera-
tu re. This de
t
ermines t he current state of charge
and the power of the battery
.
Idling current management
Idli ng cur rent management
reduces ene rgy con-
sumption wh ile the vehicle is standi ng. With the
ignition
swit
ched off
,
it
co ntrols the energy sup-
ply to the vario us elec
t
rical components
.
Data
from battery diagnosis is considered
.
Depend ing on
t
he ba
t
te ry's
st at
e of charge, indi-
vidual consumers are g radually turned off to pre-
ven
t
excess ive d ischarge of the battery and thus
maintain starting capab ility.
Dynamic energy management
While the vehicle is being driven, dynam ic ene rgy
manageme
nt
dis
t
ributes
t
he energy generated
""'
175
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