therefo re best to avoid rough tracks and un -
even terrain as much as possible . Also refer to
<=:>page 203.
A WARNING
Always adjust your driving to road and traf-
fic conditions. Do not let the extra safety
afforded by all-wheel dr ive tempt you into
taking extra risks.
- Although the all-wheel dr ive is very ef-
fective, a lways remember that braking
capacity is limited by t ire traction . You
should therefore not dr ive at excessive
speeds on icy or slippery road su rfaces.
- On wet road su rfaces, be careful not to
dr ive too fast because t he fro nt wheels
cou ld beg in to s lide on top of the wa t er
(aq uaplaning). If this sho uld occur, 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.
Energy management
Starting ability is optimized
Energy management controls the distribution
of electrical energy and thus optimi zes the
availability of electrical energy for starting
the engine .
If a veh icle wit h a conventional energy system
is not d riven for a long pe riod of time, the bat-
tery is discha rged by idling current consumers
(e.g. immobilizer) . In ce rtain circumstances it
can result in there being insufficient ene rgy
avai lab le to start the engine .
Int ell igen t energy man agemen t in your veh i-
cle hand les the d istribu t ion of electrical ener-
gy. Starting ab ility is marked ly imp roved and
the life of the battery is extended.
Basically , energy management consists of
battery diagnosis, idling current manage-
ment
and dynamic energy management.
Int e llig e nt technolog y 199
Battery diagnosis
Battery diagnosis continuously de t ermines
the state of t he battery . Sensors de t ermine
batte ry voltage, battery current and battery
temperature . This determines the current
state of charge and the power of the battery.
Idling current management
Idling curren t management reduces energy
consumption while the vehi cle is standing.
With the ignition switched off, it controls the
energy supply to the various electrica l compo-
nents. Data from battery diagnos is is cons id-
ered .
Depending on the battery's state of charge,
individ ua l cons umers are g radually turned off
to prevent excessive discharge of the battery
and thus maintain starting capability .
Dynamic energy management
While the vehicle is being driven, dynamic en -
ergy ma nagement distrib utes the energy ge n-
erated accord ing to the needs of the individ u-
al components. It regulates consumption, so
that more electrical energy is not being used
than is being generated and ensures an opti-
mal state of cha rge for the battery .
(D Tips
- But even ene rgy management cannot
negate the limits of physics. Consider
t hat the powe r and life of a battery are
limited .
- If start ing ability is threatened , the indi-
cator light (•) appears
c::> page 17 .
What you should know
The highest priority is given to maintaining
starting capability.
The battery is severely taxed in short-distance
driving, in city traff ic and during the cold time
of year . Abundant electrical energy is re-
quired, but on ly a little is generated . It is also ..,.
•
•
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