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temperature. This determines the current
state of charge and the power of the battery.
Idling current management
Idling current management reduces energy
consumpt ion while the vehicle is stand ing.
With the ignition switched off, it contro ls the
energy supply to the various e lectrica l compo -
nents . Data from battery diagnosis is consid-
ered.
Depending on the battery's state of charge,
individua l consumers are gradua lly turned off
to prevent excessive discharge of the battery
and thus maintain starting capability.
Dynamic energy management
Wh ile the veh icle is being driven, dynamic en-
ergy management dist ributes the energy gen-
erated according to the needs of the individu-
a l components . It reg ulates consumption, so
that more electrical energy is not being used
than is being generated and ensures an opti-
mal state of charge for the battery.
- But even energy management cannot
negate the limits of physics. Consider
that the power and life of a battery are
limited.
- If starting ab ility is threatened, the indi-
cator light (•) appears
c> page 16, Cl
Battery .
What you should know
The highest priority is given to maintaining
starting capability .
The battery is severely taxed in short-distance
driving, in city traffic and during the cold time
of year. Abundant electrical energy is re-
qu ired, but only a little is generated. It is also
critica l if the engine is not running and electri-
cal components are turned on. In th is in-
stance energy is being consumed but none is
be ing generated .
Intelligent technology 203
It is in precisely these situations that you will
notice energy management active ly regu lat-
ing the distribution of energy.
Vehicle stands for an extended period
If you do not drive your vehicle over a period
of several days or weeks, e lectrica l compo-
nents are gradually cut back or switched off.
This reduces energy consumption and main-
tains starting capability over a longer period.
Some of the convenience functions may not
operate, such as the interior lights or the
power seat adjustment. The convenience
functions will be available again when you
switch on the ignition and start the eng ine.
With the engine turned off
If you listen to the radio, for examp le, with
the engine turned off or use other MMI func-
tions, the battery is being discharged.
If starting capab ility is jeopardi zed due to en-
ergy consumption , the following warning ap-
pears in the MMI display:
Please start the engine soon or the system
will be turned off.
The warning indicates that the system will be
turned off automatically after 3 minutes. If
you wish to continue using the functions, you
have to start the eng ine.
With the engine running
Although electrical energy is generated when
the vehicle is being dr iven, the battery can be-
come discharged . This happens mostly when
little energy is being gene rated and a g reat
deal consumed and the battery's state of
charge is not optimal.
To bring the energy ba lance back int o equili-
brium , consumers wh ich requ ire espe cially
large amounts of energy are temporarily cut
back or switched off . Heating systems in pa r-
ticular require a great deal of energy . If you
notice, for examp le, that the heated seats* or
the heated rear window are not heating, they
have been temporarily cut back or switched .,.
•
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