GF54.10-P-0003FL Energy Management, Function

GF54.10-P-0003FL Energy Management, Function

Function requirements, general
^ Circuit 30 ON

Energy management, general
Energy management manages the provision and consumption of electrical energy with the aim of ensuring the startability of the engine and a stable supply to all electrical consumers.

This is accomplished using the following subsystems:
- Major assemblies coordinator
- On-board electrical system management

The major assemblies coordinator acts as an interface control to the alternator (G2) via the CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine). The CDI control unit or the ME-SFI [ME] control unit communicates with the alternator via the drivetrain LIN (LIN C1).
The major unit coordinator receives corresponding voltage values from the on-board electrical system management and calculates form this the voltage requirement for the ALT [alternator] for controlling the alternator management.

The on-board electrical system management monitors the capacity of the on-board electrical system and actively intervenes in balancing energy requirements. The aim is to ensure the starting ability of the engine and a stable power supply to all electrical consumers.

The following components are involved in energy management:
- Battery sensor (B95) (monitoring of charge level of on-board electrical system battery (G1))
- On-board electrical system battery (power storage and supply when the engine is off)
- Alternator (energy generation)
- Additional battery (G1/7) (with transmission 722.9 without code (B03) ECO start/stop function) (power supply "Shift by wire" with engine OFF)
- CDI control unit (alternator management)
- ME-SFI [ME] control unit (alternator management)
- Rear SAM control unit with fuse and relay module (N10/2) (on- board power supply management)
- Additional battery for ECO start/stop function (G1/13) (with code (B03) ECO start/stop function) (on-board electrical system-power supply with automatic engine start)

The master control unit for energy management is the rear SAM control unit.

Energy management influences the power output of the alternator such as to achieve a balanced, positive charge/discharge ratio in the on-board electrical system battery and provide for fuel-efficient operation of the vehicle.
The energy requirement of all electrical consumers is defined via the condition of the on-board electrical system battery and alternator current which is permanently monitored by the battery sensor. The battery sensor uses various voltage, current and temperature measurements to compute parameters that serve as the basis for energy management.

Energy management is made up of the following subfunctions which are described in separate documents:
^ Engine on energy management, function
^ Engine off energy management, function
^ Engine start/stop-automatic function (as of 1.12.09 with code (B03) ECO start/stop function)
^ DC/AC converter function (as of 1.6.10 with code (U80) 115V-socket and code (494) USA version or code (460) Canada version)