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

Model 257, 290 up to model year 2021 

G14549307Courtesy of MERCEDES-BENZ USA

IMPORTANT Model 257, 290 up to model year 2021

with code U98 (LITHIUM-ION STARTER BATTERY (LISB))

The control electronics, that perform the battery sensor tasks, are integrated into the on-board electrical system battery.

Function requirements in general 

Energy management, general 

Energy management specifies the 12 V on-board electrical system. 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 Model 257, 290 up to model year 2021 with code B01 (48V technology)

The correlation 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:

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 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 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)) 

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:

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

  Engine on energy management, function   GF54.10-P-1060FR 
  Engine off energy management, function   GF54.10-P-1050FR 
  ECO start/stop function energy management, function   GF54.10-P-1040FR 
  DC/AC converter function Model 257, 290 up to model year 2021 with code U67 (230 V socket in rear passenger compartment)
Model 257, 290 up to model year 2021 with code U80 (115 V socket)		 GF54.10-P-2005FR 
  48V on-board electrical system, function Model 257, 290 up to model year 2021 with code B01 (48V technology) GF54.10-P-2008FR 
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