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Driving
with
your
quattro
®
With all-wheel drive, all four wheels are driv-
en .
General information
With all-wheel drive, power is distributed to
all four wheels . This happens automatically
depending on your driving style and the road
conditions at the t ime. See also
t::;>
page 150.
Winter tires
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 advisable to mount winter tires (or all-sea-
son t ires) for improved driveability and brak-
ing: these tires must be mounted on all four
wheels.
Snow chains
Where snow chains are mandatory on certain
roads, th is normally also applies to vehicles
with all-wheel drive
Q
page
204, Snow
chains.
Replacing wheels/tires
Only the wheel/tire sizes specified by the
manufacturer
may be used on vehicles with
all-wheel drive
<=>
page 199 .
A
WARNING
- Always adjust your driving to road and
traffic conditions. Do not let the extra
safety afforded by all-wheel d rive tempt
you into taking extra risks.
- Although a ll-wheel drive is ve ry effect ive,
always remember that braking capacity
is limited by tire traction. You should
therefore not drive at excessive speeds
on icy or slippery road surfaces.
- On wet road surfaces, be careful not to
drive too fast because the front wheels
cou ld beg in to slide on top of the water
(aquaplaning). If this should occur, you
will have no warning from a sudden in-
crease in engine speed as with a front-
-
Intelligent
technology
155
wheel drive vehicle. Always drive at
speeds which are su ited to the road con-
ditions. - risk of crash.
Energy
management
Starting ability is optimized
Energy management controls the distribution
of electrical energy and thus optimizes the
availability of electrical energy for starting
the engine.
If a vehicle with a conventional energy system
is not driven for a long per iod of t ime, the bat-
tery is discharged by idling current consumers
(e .g. immobi lizer). In certain circumstances
it
can resu lt in the re being insufficient energy
available to start the engine.
Intelligent energy management
in your vehi-
cle handles t he distribution of e lectr ical ene r-
gy. Starting ability is markedly improved and
the life of the battery is extended .
Basically, energy management
consists of
battery diagnosis, idling current manage-
ment
and
dynamic energy management .
Battery diagnosis
Battery diagnosis continuously determines
the state of the battery. Sensors determine
battery voltage, battery current and battery
temperature . This determines the current
state of charge and the power of the battery.
Idling current management
Idling current management
reduces energy
consumption while the vehicle is standing.
With the ign ition switched off, it controls the
energy supply to the various electrical compo-
nents. Data from battery diagnosis is consid-
ered.
Depending on the battery's state of charge,
individual cons umers are gradually turned off
to prevent excessive discharge of the battery
and thus maintain starting capability.
.,..
•
•
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