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192
Intelligent
technolog
y
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 conventional energy system
is not driven for a long period of time, the bat-
tery is discharged by idling current consumers
(e.g. immobilizer). In certain circumstances it
can result in there bei ng insuff icient ene rgy
availab le to start t he engine .
Intell igent energy management in your vehi-
cle hand les t he dist ribut ion of elect rical ener-
gy. Starting ab ility is mar ked ly imp roved and
the life of the battery is extended .
Basically, energy management consists of
batt ery diagno sis, idling current manag e-
ment
and
dynami c energy man agement .
Battery diagnosis
Battery diagnosis continuously determ ines
the state of the battery . Sensors determ ine
battery voltage, battery current and battery
temperature . This dete rm ines the current
sta t e of charge and the power of the batt ery.
Idling current management
Idling current management reduces energy
consumption wh ile the vehicle is stand ing .
With the ignition switched off, it cont rols the
ene rgy supply to the various electrica l compo-
nents . Data from battery diagnosis is consid-
ered.
Depending on the battery's state of charge,
individua l consumers are grad ually t urned off
to prevent excess ive discharge of the batt ery
and thus mainta in start ing capability.
Dynamic energy management
While the vehicle is being dr iven, dynamic en-
ergy management dist ributes t he energy gen-
erated accordi ng to the needs of the individu-
al componen t s. It reg ulates cons ump t ion, so
that more electrical ene rgy is not being used
than is being generated and ensures an opti -
mal state of charge for the battery.
(D
Tips
- But even energy man ageme nt canno t
negate the limit s of physics . Conside r
that the powe r and life of a battery are
limited .
- If start ing ability is threatened, the indi-
cator light (•) appears ~ page 17.
What you should know
The highest priority is given to maintaining
starting capability .
The battery is severe ly t axed in short -distance
driving, in city traff ic and during t he cold time
of yea r. Abundant electrical energy is re-
quired, but on ly a little is generated . It is also
critical if the engine is not running and electri-
cal components are turned on . In this in-
stance ene rgy is be ing consumed but none is
being generated .
It is in precisely these s ituations that you will
notice energy management active ly reg ulat-
ing the distribution of energy.
Vehicle stand s for an extended period
If you do not drive your vehicle over a period
of several days or weeks, electrica l compo -
nents are gradually cut back or switched off.
This reduces energy consumption and ma in-
ta ins start ing capability over a longer period.
Some of the convenience functions may not
operate, such as the interior lights or the
power seat adjustme nt. The convenience
functi ons will be available again when you
switc h on t he ignit ion and sta rt the eng ine .
With the engine turned off
If you listen to t he radio, for examp le, wit h
the engine t urned off or use other MMI func-
t ions, t he battery is being discharged.
If starting capability is j eopardized due to en -
ergy consump t ion, the following warning ap-
pears in t he MMI display:
.,,.
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