Electrics
Page 9.12
Nominal Battery Voltage
The default voltage for the generator is based on the temperature
dependent maximum permitted battery voltage. The voltage range that
can be set as the generator output voltage over the interface is
between 13.5 volts and 15 volts. Since the battery temperature cannot
be measured directly, the battery temperature is determined from a map
using replacement values.
The battery temperature is calculated using the following
available CAN signals:
• Coolant temperature.
• Outside temperature (filtered).
• Idle time of vehicle.
• Indicator light for auxiliary heating (coolant temperature rises when
the auxiliary heating system is on).
Determining the Vehicle Electrical System Status
The status of the vehicle electrical system is mainly determined by com-
paring the determined voltage with a permitted lower voltage limit.
The values determined for:
• Battery voltage,
• DF signal (generator utilization),
• Information about active high current loads with a short “on” time are
essentially used to determine the vehicle electrical system status.
The load switching states currently requested by the driver are also
stored in the vehicle electrical system control unit.
Division of Functions for Control Units
The DME control unit controls the engine rpm and enables a two-stage
increase in idling speed.
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