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A cen t er differentia l distrib utes the driving power
variab ly to the front and rear axle. It works to-
gether with selective wheel torque control, which
ac t ivates when driving through curves
¢page 190.
The all-wheel drive concept is designed for high
engine power. Your ve hicle is exceptionally pow-
erful and has excellent driving characterist ics
both under norma l dr iving condit ions and on
snow and ice. Always read and follow safety pre -
cautions ¢ .&..
Winter tires
When driving in the w inter, 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 t ires (or all-season tires) for
improved driveab ility and brak ing : these tires
must be mounted on all four wheels. See a lso
¢
page 249, Winter tires.
Tire chains
Where tire chains are manda t ory on certain
roads, this normally also applies to vehicles w ith
a ll-wheel drive ¢
page 249 , Snow chains.
Replacing wheel s/ t ires
Veh icles with all -whee l dr ive must always have
tires of the same s ize. Also avo id tires with differ-
ent tread depths . For detai ls see page
¢
page 241, New tires or wheels.
A
WARNING
Always adjust you r driving to road and t raff ic
conditions. Do not let the extra safety affo rd-
ed by all-wheel drive t empt you into tak ing
extra risks.
- Alt hough the all-whee l dr ive is very effec-
t ive, al ways remember th at br ak ing ca pac ity
is limited by tire traction. You should t here-
fore not d rive at excess ive speeds on icy or
slippery road surfaces.
- On wet road surfaces, be caref ul not to drive
too fast because the front wheels could be-
gin to slide on top of the water (aqu aplan-
ing). If this shou ld occu r, you w ill have no
warning from a sudden increase in eng ine
speed as with a front -whee l dr ive vehicle.
Intellig
e nt Technology
Always d rive at speeds which are suited to
the road conditions - risk of crash.
Energy
management
Starting ability is optimized
Energy management controls the distribution of
electrical energy and thus optimizes the availa-
bility of electrical energy for starting the engine .
If a vehicle with a conventiona l energy system is
not dr iven fo r a long pe riod of time, the ba t tery is
discharged by id ling curre nt cons umers (e.g. im-
mobili ze r). In ce rtain circumstances it can resu lt
in t he re being insuffi cient energy availa bl e to
st ar t t he eng ine.
Intellige nt ene rgy manageme nt in your vehicle
hand les the d ist ribution of electrical energy.
St a rt ing abil ity is m ar kedly improved a nd the life
of the ba tt ery is ext ende d .
Bas ica lly, energy management
cons ists of bat-
tery diagnosis, idling current management a nd
dynamic energy management .
Battery diagnosis
Battery d iagnosis continuously determ ines the
state of the battery . Sensors de t ermine battery
voltage, battery curren t and batte ry tempera-
tu re . This determines t he cur rent state of charge
and the power of t he battery.
Idling current management
Idli ng cur rent management
reduces energy con -
s umption wh ile t he vehicle is standing . With the
ignition switched off , it contro ls the energy sup-
ply to the vario us elec t rical componen t s. Data
fr om bat tery diagnosis is co nsidere d .
Depend ing on t he ba t te ry's st at e of charge, indi-
vidual consumers are gradually t urned off to pre-
ven t excess ive disc ha rge of t he battery and thus
m a int a in st arting capabili ty.
Dynamic energy management
While the vehicle is being driven, dynam ic e nergy
manageme nt dis t ributes t he energy generated
according to t he needs of the ind ividual compo-
nents. It regula t es consu m ption, so that more
..,.
195
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