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

Model 205, 253 

G15021987Courtesy of MERCEDES-BENZ USA

Function requirements, general 

Energy management, general 

Energy management manages the provision (supply) and consumption (management) of electrical energy with the aim of ensuring mobility and a stable supply of all electrical consumers.

IMPORTANT Energy management specifies the 12 V on-board electrical system. The correlation between the high-voltage and 12 V on-board electrical system is also described for hybrid vehicles as well as model 253.99. For vehicles with code B01 (48V technology), interaction between the 12 V on-board electrical system and the 48 V on-board electrical system is also described.

The following components are involved in energy management:

Except model 253.99: 

Model 253.99: 

Production mode 

The production mode is described in the "Engine OFF energy management" function description.

Transport mode 

The transport mode is activated in the production plant at the end of the production process, and it sets the overall vehicle into a defined special condition.

With targeted interventions in individual electronics systems the following is achieved:

The transport mode remains active on its way from the production plant to the dealers and company-owned sales and service outlets around the world up to the so-called delivery inspection and the final handover to the end customers.

IMPORTANT The transport mode is automatically deactivated from a total distance traveled of more than 350 km whereupon it cannot be activated again. Up to this limit, the transport mode can be deactivated using the diagnosis tester or key combinations at any give time and activated with the diagnosis tester again. The fault memory is not actively deleted when the key combination is used for deactivation. This means that the "Transport mode active" entry remains stored. This must be deleted using the diagnosis tester when the vehicle is inspected for the first time.

To support the processes in Sales and Logistics, the vehicle's currently possible residual service life and, if necessary, appropriate care instructions for the on-board electrical system battery are shown on the multifunction display of the instrument cluster when the transport mode is active.

The energy management system's continuously determined condition of the on-board electrical system battery is rendered fully transparent at any given time without the use of any additional measuring instruments during the vehicle delivery period. This display provides the operating personnel with specific instructions on what to do to guarantee a high delivery quality with regard to the on-board electrical system battery.

The individual transport mode functionalities are split up for numerous individual systems. The core here is the central control of the transport mode by the energy management system. According to the energy management specifications, targeted interventions (function restrictions and changes) are carried out in individual electronics systems.

The following function limits or modifications are implemented during the transport mode:

The following tasks are carried out by the energy management system:

The following graphic shows, by way of an example, various displays of the Transport mode in the instrument cluster's multifunction display.

G10076678Courtesy of MERCEDES-BENZ USA

Hybrid vehicles 

Because of the drive technology involved, hybrid vehicles are equipped with a high-voltage on-board electrical system.

Apart from the energy flows in the high-voltage on-board electrical system, the energy management module in the CDI control unit or ME-SFI control unit additionally controls the voltage conversion and energy exchange from and to the 12 V on-board electrical system.

For this purpose, the CDI control unit or the ME-SFI control unit communicates with the power electronics control unit via the drive train CAN, drivetrain control unit and hybrid CAN and with the alternator via the drive train LIN. The 12 V on-board electrical system powered through the high-voltage on-board electrical system ("Buck mode"). When the engine is off or in boost mode, the 12 V on-board electrical system is supplied with energy stored in the high-voltage battery and, when the vehicle is in operation, with energy generated by the electrical machine. For model 205.012/212 up to 31.05.2018, the alternator is also activated, if the energy provided by the power electronics control unit does not cover the existing energy requirement.

IMPORTANT When outside temperatures are extremely low, the 12 V on-board electrical system is supplied with energy from the high-voltage on-board electrical system in order to safeguard the engine's starting capability ("boost mode").

The following components are involved in the high-voltage energy management:

48 V on-board electrical system (with code B01 (48V technology)) 

The DC/DC converter control unit controls the energy flows in the 48 V on-board electrical system as well as voltage conversion and energy exchange with the 12 V on-board electrical system. The 12 V on-board electrical system is supplied with energy from the 48 V on-board electrical system via the DC/DC converter. The power supply of the 48 V on-board electrical system is realized during vehicle operation with the energy generated by the starter-alternator and during engine off with the energy stored in the 48 V on-board electrical system battery. Furthermore, when a charger is connected to the on-board electrical system battery, it is possible to transfer energy from the 12 V on-board electrical system via the DC/DC converter to the 48 V on-board electrical system.

The following components are involved in 48 V energy management:

Major assembly coordinator (except code B01 (48V technology) and except model 253.99) 

The major assembly coordinator is integrated into the CDI control unit or the ME-SFI control unit and forms the interface between the energy management system and the alternator. The CDI control unit or the ME-SFI control unit communicates with the alternator over the drive train LIN. The major assembly coordinator regulates the alternator's power output to match the energy management system specifications, taking engine load into consideration.

The recording and evaluation of the relevant variables for this are conducted by the following components:

Model 253.99 

Model 253.99 is equipped with a high-voltage on-board electrical system because of its drive technology. The 12 V on-board electrical system is powered by the high-voltage on-board electrical system.

The DC/DC converter control unit forms the energy-specific interface between the high-voltage on-board electrical system and the 12 V on-board electrical system. It regulates the voltage conversion and energy exchange from and to the 12 V on-board electrical system.

The following components are involved in the high-voltage energy management:

Energy management contains the following subfunctions, which are described in separate documents:

  Engine on energy management, function   GF54.10-P-1060RF 
  Engine off energy management, function Model 205
as of model year 2019
Model 253 (except 253.99)
as of model year 2020
Model 253.99		 GF54.10-P-1050RFM 
    Model 205
up to model year 2019
Model 253 (except 253.99)
up to model year 2020		 GF54.10-P-1050RF
  ECO start/stop function energy management, function Model 205, 253 (except 253.99) GF54.10-P-1040RF 
  DC/AC converter function Model 205, 253 with code U67 (230 V socket in interior compartment)
Model 205, 253
with code U80 (115 V socket)		 GF54.10-P-2005RF 
  48V on-board electrical system, function Model 205, 253 with engine 264
with code B01 (48V technology)		 GF54.10-P-2008RFM
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