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198
Intelligent
technology
Winter t ires
When dr iving in the w inter, your vehicle w ith
a ll-whee l drive has an advantage,
even
with
regular ti res . 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. See also
c:>
page 264, Winter tires.
Tire chains
Where t ire cha ins are mandatory on certa in
roads, th is normally a lso applies to vehicles
with a ll-wheel drive
c:>
page 265, Snow
chains.
Replacing wheel s/ t ires
Vehicles with all-wheel drive must a lways
have tires of the same size . Also avoid tires
with d ifferent tread depths. For details see
page
c:>
page 257, New tires and replacing
tires and wheels.
Off-Road driv ing?
Your Audi does not have enough ground clear -
ance to 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:>
page 201.
A
WARNING
Always adjust your driving to road and traf-
fic condit ions . Do not let the ext ra safety
afforded by all-wheel dr ive tempt you into
taking extra risks.
- Alt hough the all-whee l dr ive is
very
ef-
fec t ive, a lways remember that braking
cap acity is limited by ti re traction. You
sho uld the refore not dr ive at excessive
speeds on icy or slippery road su rfaces.
- On wet road surfaces, be car eful not to
drive too fast because the front wheels
cou ld begin to slid e on top of the water
(aq uaplaning) . If this sho uld occ ur, you
will have no warn ing from a sudden in-
crease in engine speed as with a front-
w heel d rive vehicle. Always drive at
speeds w hich are suited 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 conventiona l energy system
is not driven for a long per iod of t ime, t he bat-
te ry is discharged by idling current consume rs
(e .g. immobili ze r). In certa in circumstan ces it
can res ult in the re be ing insu ff icien t energy
available to start the eng ine.
Intelligent energy management
in your vehi-
cle ha ndles the dist ribution of e lectr ical ene r-
gy. Start ing abili t y is m ar ked ly improved and
the life of the battery is extended .
Bas ica lly, energy management
consists of
battery diagnosis, idling current manage-
ment and dynamic energy management .
Battery diagnosis
Battery diagnosis continuously determines
the state of the batte ry. Sensors determine
batte ry voltage, batt e ry cu rre nt and battery
tempe ratu re. This de t ermines the cur ren t
sta t e of cha rge and t he power of t he battery.
Idling current management
Idli ng cur rent management
reduces energy
consumpt ion while the vehicle is standing .
With the ig nition sw itched off, it controls the
energy supp ly to t he variou s ele ctri cal compo -
nen t s. Dat a from ba tt e ry d iagnos is is co nsid-
ered.
Depend ing on the batte ry's state of cha rge,
individ ual con su me rs a re g radually turned off
to prevent excessive discharge of the battery
and th us main t ain starting capabi lity.
Dynamic energy management
While the vehicle is being d riven, dynamic en-
ergy ma nagement distr ibutes the energy ge n-
era t ed a ccord ing to t he needs of t he individu -
al components . It regula t es consumption, so
t hat more e lectrical energy is not being used
..,.
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