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ignition switched off, it controls the energy sup-
ply to the various electrical components . Data
from battery diagnosis is considered.
Depending on the battery 's state of charge, ind i-
vidual consumers are gradually turned off to pre -
vent excessive discharge of the battery and thus
maintain starting capability.
Dynamic energy management
Wh ile the veh icle is being driven , dynamic energy
management dist ributes the energy ge nerated
according to the needs of the individua l compo -
nents . It regulates consumption, so that more
e lectrical energy is not being used than is being
generated and ensures an optimal state of
charge for the battery.
- But even energy management cannot neg-
ate the limits of physics. Consider that the
power and life of a battery are limited.
- If starting ability is threatened, the indica-
tor light (•] appears
¢ page 30 .
What you should know
The highest priority is given to maintaining start-
ing capability .
The battery is severely taxed in short-distance
d riving, in city traffic and during the cold time of
year. Abundant electrical energy is required, but
only a little is generated . It is also crit ica l if the
engine is not runn ing and electrical components
are turned on . In this instance energy is being
consumed but none is being generated .
It is in precisely these situations that you will no-
tice energy management actively regulat ing the
d istr ibution of energy .
Vehicle stands for an extended period
If you do not drive your vehicle over a period of
several days or weeks, electrical components are
gradually cut back or sw itched off. This reduces
energy consumption and ma inta ins starting ca-
pability over a longer pe riod . Some of the con-
ve nience funct ions may not operate, suc h as the
inte rior ligh t s or the powe r seat adjustment. The
Intellig e nt Technology
convenience functions will be availab le aga in
when you switch on the ignition and sta rt the en-
gine.
With the engine turn ed off
If you listen t o t he rad io, for examp le, with the
engi ne turned off or use other
MMI* functions,
the battery is being discharged .
If st arting capab ility is jeopardized due to energy
consumption, a message appears in the rad io or
MMI* disp lay. The message indica t es that the
system will be switched off automatically in a
moment . If you wish to continue using the func -
t ions, you have to start the engine.
With the engine running
Although e lectr ical energy is generated when t he
vehicle is being driven, t he batte ry can become
discharged. This happens mostly when litt le en-
ergy is being generated and a great dea l con-
sumed and the battery's state of charge is not
optimal.
To bring the energy balance back into equilibr i-
um, consumers whic h require especia lly large
amounts of energy are temporari ly cut back or
switched off. Heating systems in particular re-
quire a great deal of energy. If you notice, for ex-
ample, that the heated seats* or the heated rear
window a re not heati ng, they have bee n tempo-
rarily cut bac k or switched off . These systems will
be available again as soon as the ene rgy balance
has been restored.
You will also notice that engine idle speed has
been increased s light ly. This is no rma l and not a
cause for concern. By increas ing engine idle
speed the additional energy required is genera t -
ed and the battery is charged.
193
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