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Tire chains
Where tire chains are mandatory on certain roads, this normally
also applies to vehicles with All Wheel Drive:::::, page
342,
"Snow
chains".
Replacing
wheels/tires
Vehicles with All Wheel Drive must always have tires of the same
size . Also avoid tires with different tread depths. For details see
page :::::, page
336,
"New tires and replacing tires and wheels".
Off-Road
driving?
Your Audi does not have enough ground clearance to be used as an
off-road vehicle. It is therefore best to avoid rough tracks and
uneven terrain as much as possible. Also refer to :::::, page
279.
&
WARNING
Always adjust your driving to road and traffic conditions. Do not
let the extra safety afforded by All Wheel Drive tempt you into
taking extra risks.
•
Although the All Wheel Drive is very effective, 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 could begin to slide on top of the water (aqua-
planing). If this should occur, you will have no 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 condi-
tions - 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 period of time, the battery is discharged by idling current
consumers (e.g. immobilizer) . In certain circumstances it can result
in there being insufficient energy available to start the engine.
Intelligent energy management in your vehicle handles the distribu-
tion of electrical energy. Starting ability is markedly improved and
the life of the battery is extended.
Basically, energy management consists of battery diagnosis, idling
current management 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 ignition switched off, it controls the
energy supply to the various electrical components . Data from
battery diagnosis is considered.
Depending on the battery's state of charge, individual consumers
are gradually turned off to prevent excessive discharge of the
battery and thus maintain starting capability.
Dynamic
energy
management
While the vehicle is being driven , dynamic energy management
distributes the energy generated according to the needs of the indi - _,,,
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