Energy Management, Function - GF54.10-P-0003RR
Model 190
Function requirements, general
- Circuit 30 ON
Energy management, general
Energy management manages the provision (supply) and consumption (management) of electrical energy with the aim of ensuring the startability of the engine and a stable supply to all electrical consumers. To do so, the energy management function monitors on-board power supply utilization and actively intervenes in the energy management (e.g. through consumer reduction (shut down of comfort functions).
The following components are involved in energy management:
- Electronics in on-board electrical system battery (monitoring of charge level for on-board electrical system battery)
- On-board electrical system battery (energy storage and supply when the engine is off)
- Alternator (energy generation)
- ME-SFI [ME] control unit (major-assembly coordinator, alternator management)
- Rear SAM control unit (energy management, control of on-board electrical system support)
- Voltage dip limiter (series resistor) at the positive terminal of the on-board electrical system battery (reduction of the starting voltage dip)
The major assembly coordinator is integrated into the ME-SFI control unit and forms the interface between the energy management system and the alternator. The ME-SFI [ME] control unit communicates with the alternator through the drive-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:
- Alternator
- ME-SFI [ME] control unit
- Rear SAM control unit
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:
- Reduction of shipping damage and accidents
- Best-possible charging of on-board electrical system battery through optimized energy management
- Avoidance of damage to and contamination of the vehicle interior as well as theft of loose parts from the vehicle interior
- Discontinuation of transport protection seal
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 hand over to the end customers.
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 onboard 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 onboard 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. Energy management performs central control of the transport mode. 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:
- Limitation of vehicle speed to v = 40 km/h
- Electric locking of front passenger door and liftgate
- Monitoring of circuit 15 at standstill and acoustic feedback, when the vehicle is at a standstill for t > 10 s with the ignition switched on and the engine switched off
- Optimized quiescent current management, when the vehicle is parked for an extended period (e.g. transportation by ship)
- Limit exterior light functions
- Implementation of display in instrument cluster's multifunction display
- Adjust fault memory handling
The following tasks are carried out by the energy management system:
- Set specific consumer shutoff stages
- Optimized charging of on-board electrical system battery (deactivation of alternator management)
- Deactivation of ECO start/stop function
- Early opening of no-load current shutoff relay
- Restriction of closing reasons for quiescent current shutoff relay
Energy management contains the following functions, which are described in separate documents:
- Engine on energy management, function
- Engine off energy management, function
- Energy management for ECO start/stop function
The "energy management for ECO start/stop function" is considered from the viewpoint of the energy management. Detailed information on the "Engine management for start/stop function" is contained in the function description "Gasoline injection and ignition system with direct injection, function".
| Engine on energy management, function | GF54.10-P-1060RR | ||
| Engine off energy management, function | GF54.10-P-1050RR | ||
| ECO start/stop function energy management, function | GF54.10-P-1040RR |