GF54.10-P-0002RIT Onboard Electrical System Control, Function

GF54.10-P-0002RIT Onboard Electrical System Control, Function
- with CODE (P99) Special model "AMG Black Series"

General function requirements
^ C. 30 ON

On-board electrical system control, general
The on-board electrical system control manages the provision and consumption of electrical energy with the aim of ensuring the starting ability of the engine and a stable power supply to all electrical consumers.
On-board electrical system control is performed by the vehicle power supply control unit (N82/1). The following components are involved in on-board electrical system control:
- Vehicle power supply control unit (master control unit)
- Alternator (G2) (power generation)
- On-board electrical system battery (G1) (power storage and supply when the engine is off)

The state of the on-board electrical system battery is defined by the on-board electrical system voltage. The vehicle power supply control unit registers the currents and voltages of the on-board electrical system battery and uses these to calculate the present state of the on-board electrical system battery.
In addition, the vehicle power supply control unit reads in the following information via interior CAN (CAN B):
- Engine speed, provided by the ME-SFI [ME] control unit (N3/10) on the engine compartment CAN (CAN C) and forwarded by the EIS [EZS] control unit (N73) via the interior CAN
- Vehicle speed, provided by instrument cluster (A1)
- Circuit 61 status, provided by the passenger-side SAM control unit (N10/11)

The on-board electrical system control is comprised of the following subfunctions, which are described in separate documents:
^ On-board electrical system emergency mode, function
^ Consumer shutoff function