5 Series E60 525xd (M57T2) SAL
•
Alternator
•
Terminal 30g relay
•
Consumers on terminal 30/terminal 30g
-
Function/systems involved in energy management:
•
Power management
•
Car Access System (CAS)
-
Signals/characteristic curves in energy management system:
•
Current flow to consumers
•
Increased idling speed
•
Battery charge current
•
Nominal value for charge voltage
•
Reduced fuel consumption
•
Terminal 15 wake-up wire
Power management
The power management is on the one hand part of the electrical energy management system. Power management is
software stored in the DME or DDE and in the intelligent battery sensor that is used for controlling the vehicle's
energy requirements.
Power management comprises the functions controlled by the software in the DME / DDE and in the IBS:
-
Variable charge voltage for the battery by adapting the charge voltage from the alternator to that required by the
battery
-
Increased idling speed to boost the alternator's output
-
Reduction of load peaks through power reduction when the vehicle's electrical system is unable to provide the
energy needed (vehicle electrical system deficiency)
-
Auxiliary consumers switched off via CAN messages when engine has reached its limit of starting capability
-
Off-load current monitoring
Power management links the input signals with the characteristic curves stored in an EPROM (Erasable
Programmable Read-Only Memory) and generates the output signals to control energy requirements.
-
Power management components:
•
DME or DDE
•
EPROM
•
Microcontroller
-
Power management input signals:
•
Battery voltage (U)
•
Current (I
±
)
•
Temperature (T)
-
Characteristic curves
•
Battery voltage (U)
•
Current (I
±
)
•
Temperature (T)
SBT Power supply E60, E61, E63, E64
BMW AG - TIS
21.02.2013 11:11
Issue status (12/2007) Valid only until next DVD is issued
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