Checking and refilling levels
In your vehicle, a smart energy management
system is responsible for distributing the electri-
cal energy. This clearly improves the starting
performance and service life of the battery.
The main functions incorporated in the power
management system are battery diagnosis,
residual current management and a dy-
namic power management system.
Battery diagnostics
Battery diagnostics determine the status of the
battery on an ongoing basis. The battery volt-
age, current and temperature are monitored for
this purpose. This is used to determine the bat-
tery's charge level and eciency.
Residual current management system
The residual current management reduces en-
ergy consumption while the vehicle is station-
ary. When the ignition is switched o, it man-
ages the power supply to the various electrical
devices. In doing so, it takes into account the
battery diagnostic data.
With the ignition on and depending on the
battery's charge level, it disconnects electrical
devices one after the other to avoid over-dis-
charging the battery and to maintain starting
capacity.
Dynamic energy management system
Energy generated while driving is distributed
by the dynamic energy management system
to the electrical devices according to their en-
ergy requirements. It also ensures that no more
energy is consumed than is generated, thus en-
suring an optimal battery charge level.
Note
●
The energy management system cannot
override the limits imposed by the laws of
physics. Please note that the capacity and
service life of the battery are limited.
●
When there is a risk that the vehicle will not
start, the low battery charge level warning
lamp will be shown ›››page354.
Discharged battery
Maintaining starting capacity has top priority.
Battery strain is considerable on short journeys,
city driving and in the cold season of the year.
In these situations, a lot of energy is required
but very little is generated. If the engine is stop-
ped and at the same time the electrical devices
are switched on, the battery can become dis-
charged to a critical point. In this case energy
is consumed without being generated at the
same time.
In these situations you will notice that the en-
ergy regulation system performs active energy
distribution adjustments.
Vehicle stationary for a long period of time
If you do not drive the vehicle for a few days
or weeks, adjustments will be made to reduce
consumption or the electrical devices will be
deactivated one by one. This reduces energy
consumption and the starting capacity is main-
tained for longer. Some convenience functions
may not be available under certain circumstan-
ces. The convenience functions will be availa-
ble again when the ignition is switched on and
the engine is started.
With the engine stopped
If you listen to the radio, for example, while
the engine is stopped, the battery will be dis-
charged.
If the energy consumption means there is a risk
that the engine will not start, a text will be dis-
played in vehicles with a driver information sys-
tem.
This driver message indicates that the engine
must be started to recharge the battery.
With the engine running
The battery may discharge despite the fact
that energy is being generated while the vehi-
cle is in motion. This is particularly the case if
too little energy is generated and too much is
consumed at a time while the battery's level of
charge is not optimal.
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