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

Model 217, 222 

G15299354Courtesy of MERCEDES-BENZ USA

IMPORTANT Model 217, 222 with engine 157, 279

A control unit is integrated into the on-board electrical system battery, which executes the battery sensor tasks.

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. For model 222 with code B01 (48V technology), the interaction between the 12 V on-board electrical system and the 48 V on-board electrical system is also described. In addition, the interaction between the high-voltage and 12 V on-board electrical systems is described for hybrid vehicles (model 222.004/057/104/157/163/173). A detailed description of the high-voltage on-board electrical system can be found in the function description of the hybrid system.

The following components are involved in energy management:

Model 222.004/057/104/157/163/173:

Due to their drive technology, hybrid vehicles are equipped with an additional high-voltage on-board electrical system (U = 140 V). 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, powertrain control unit and hybrid CAN and with the alternator via the drive train LIN. The 12 V on-board electrical system is supplied with energy primarily from 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. If the energy made available by the power electronics control unit does not meet the existing energy requirements, the alternator will be switched on.

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:

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 on-board electrical system battery status which is continuously acquired by the energy management system is rendered fully transparently 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:

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. While driving, the 48 V on-board electrical system is supplied with energy generated by the integrated starter alternator, and when the engine is 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-1060LF 
  Engine off energy management, function   GF54.10-P-1050LF 
  ECO start/stop function energy management, function   GF54.10-P-1040LF 
  DC/AC converter function Model 222
with code U67 (230 V socket in interior compartment)
Model 222
with code U80 (115 V socket)		 GF54.10-P-2005LF
  48V on-board electrical system, function Model 222
with code B01 (48V technology)		 GF54.10-P-2008LF
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