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Snow chains
Where t ire chains are mandatory on certain
roads, this normally a lso applies to vehicles
with a ll-wheel drive
c:>
page 214, Snow
chains .
Replacing wheels / tires
Vehicles with all-wheel drive must a lways
have tires of the same size. Also avoid t ires
with different tread depths. For details see
page
c:>
page 209, New tires and replacing
tires and wheels .
Off -Road driving?
Your Audi does not have enough ground clear-
ance t o be used as an off-road vehicle. It is
therefore best to avoid rough tracks and un -
even terrain as much as possible . Also refer to
c:> p age 163.
A
WARNING
Always adjust your driving to road and traf-
fic condit ions. Do not let the extra safety
afforded by all-wheel drive tempt you into
taking extra risks.
- Although the all-wheel dr ive is very ef-
fective, always remember that braking
capacity is limited by t ire traction . You
should therefore not dr ive at excessive
speeds on icy or slippery road surfaces.
- On wet road surfaces, be careful not to
dr ive too fast because the fro nt wheels
cou ld beg in to s lide on top of t he water
(aquaplaning). If this sho uld occ ur, you
will have no warning from a sudden in-
crease in engine speed as with a front-
wheel drive vehicle. Always drive at
speeds wh ich are suited to the road con-
ditions. - risk of crash.
Int e llig e nt technolog
y
159
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 conventiona l energy system
is not d riven for a long per iod of t ime, the bat-
tery is discharged by idling current consumers
(e .g. immobilize r). In certain circumstances
it
can resu lt in the re be ing insuffic ient energy
available to start the engine.
Intelligent energy management
in your vehi-
cle ha ndles the dis t ribution of e lectr ical ene r-
gy. Start ing ability is markedly improved and
the life of the battery is extended .
Bas ica lly, energy management
consists of
batt ery diagnosis, idling current manage-
ment and dynamic energy management.
Battery diagnosis
Battery diagnosis continuously determ ines
the state of the batte ry. Sensors determine
battery voltage, battery cu rrent and batte ry
tempe rature. This de t ermines the curren t
state of cha rge and the power of the battery .
Idling current management
Idling current management
reduces energy
consumption while the vehicle is standing .
With the ig nition switched off, it controls the
energy supply to the various ele ctrica l compo -
nents. Dat a fr om ba ttery d iagnos is is cons id-
ered.
Depend ing on the batte ry's state of cha rge,
individ ual cons ume rs a re g radually turned off
to prevent excessive discharge of the battery
and th us maintain sta rt ing capability.
Dynamic energy management
While the vehicle is being dr iven, dynamic e n-
ergy ma nagement distr ibutes the energy ge n-
erated accord ing to the needs of t he individ u-
al components . It regulates consumpt ion, so
that more e lectrical energy is not being used
.,.
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