Electrics
Page 9.13
Vehicle Electrical System Control Unit
The vehicle electrical system control unit has a communication interface
with the generator that is used to preset the nominal charging voltage.
The generator sends its utilization rate (DF signal) to the vehicle electri-
cal system control unit over this interface. By evaluating the battery volt-
age and DF signal, the vehicle electrical system control unit evaluates
the vehicle electrical system status and switches off comfort loads if
necessary.
The battery voltage is monitored via a separate input. The vehicle elec-
trical system control unit communicates with the DME control unit in or-
der to increase the idling speed if necessary for the purpose of improv-
ing the vehicle electrical system status.
A - CAN drive
B - Gateway control unit
C - CAN Comfort
D - Engine control unit (DME)
E - Vehicle electrical system control unit
1 - Engine rpm
2 - Idling rpm increase
3 - Coolant temperature
4 - DF signal
5 - Battery voltage
6 - Switch-on status of loads
7 - Switch-off specification of loads
8 - Outside temperature
9 - Idle time of vehicle
10 - Auxiliary heating system status
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