Energy Management, Basic Function - GF54.10-P-9900A

Model All (4xWD) 

Model All (CAR) 

Overview 

This document contains information on:

• General 
• Function 
  • 12 V on-board electrical system 
  • 24 V on-board electrical system (off-road vehicle with on-board electrical system 12 V/24 V) 
  • 48 V on-board electrical system (vehicles with 48 V technology) 
  • High-voltage on-board electrical system (hybrid vehicles, electric vehicles) 

General 

The energy management manages the provision (supply) and consumption (budget) of electrical energy. It controls all the measures that assure the mobility of the vehicle and guarantee that all the consumers receive a stable supply of electrical energy according to requirements. The aim is efficient use of energy.

Function 

Energy management includes different on-board electrical systems.

12 V on-board electrical system 

The 12 V on-board electrical system supplies the electrical consumers of different systems, such as interior lighting, exterior lighting or engine management, with electrical energy. The main components of the 12 V onboard electrical system are the 12 V on-board electrical system battery, alternator (vehicles with 12 V alternator) or DC/DC converter (vehicles with 48 V technology, hybrid vehicles, electric vehicles) and die energy management control.

Vehicles for highly automated parking or driving also have a secondary 12 V on-board electrical system. If the primary 12 V on-board electrical system fails, system-relevant consumers are then supplied through the secondary 12 V on-board electrical system.

24 V on-board electrical system (off-road vehicle with on-board electrical system 12 V/24 V) 

Depending on the equipment installed, the 24 V on-board electrical system supplies various electrical consumers such as, e.g. two-way radio, cable winch or sockets. The main components of the 24 V on-board electrical system are the 24 V on-board electrical system battery, the 24 V alternator and, depending on the equipment installed, the 24 V start box with jump-start socket.

48 V on-board electrical system (vehicles with 48 V technology) 

The 48 V on-board electrical system supplies all 48 V consumer (consumers with high energy requirement) with electrical energy. It also provides electrical energy for starting the combustion engine with the starter-alternator. The main components of the 48 V on-board electrical system are the 48 V battery, the DC/DC converter (energy transfer), the powertrain control unit (traction management control) and the starter-alternator.

High-voltage on-board electrical system (hybrid vehicles, electric vehicles) 

The high-voltage on-board electrical system makes it possible to operate the electric machine for the electric drive. The high-voltage on-board electrical system provides electrical energy to electrical consumers with high energy demands, e.g. the electrical refrigerant compressor or high-voltage PTC heater. The main components of the high-voltage on-board electrical system are the high-voltage battery, DC/DC converter (energy transfer), electric machine, high voltage starter alternator (AMG hybrid vehicles, model dependent) and the battery management system control unit (energy management).

	Additional basic functions
	Energy management in event of voltage drop, basic function		GF54.10-P-1010A
	Energy management for ECO start/stop function, basic function	Model all (CAR)	GF54.10-P-1009A
	12 V on-board electrical system, basic function		GF54.10-P-1014A
	24 V on-board electrical system, basic function	Model 464	GF54.10-P-1020A
	48 V on-board electrical system, basic function	Model all (CAR) with code B01 (48V technology)	GF54.10-P-1015A
	High-voltage on-board electrical system, basic function	Electric vehicles and hybrid vehicles	GF54.10-P-1016A
	Evaluate battery charge level, basic function		GF54.10-P-1000A
	Charge battery while driving, basic function		GF54.10-P-1002A
	Stationary battery charging, basic function		GF54.10-P-1006A
	Battery cell monitoring, basic function	Model all (CAR)	GF54.10-P-1019A
	Deep discharge protection, basic function		GF54.10-P-1012A
	Separate operation of secondary 12 V onboard electrical system, basic function	Model all (CAR)	GF54.10-P-1017A
	DC/AC converter, basic function	Model all (CAR) with code U67 (230 V socket in rear passenger compartment) Model all (CAR) with code U80 (115 V socket)	GF54.10-P-1013A