BMW 3: Voltage supply
The 12 V vehicle electrical system of the G20 PHEV is essentially the same as
the electrical system of
the G20. The main difference lies in the fact that the power supply is no longer
by the alternator, but
by the high-voltage electrical system. The high voltage of the high-voltage
battery unit is converted to
the lower voltage (approximately 14 V) using a DC/DC converter in the Electrical
Machine Electronics
(EME). The electric voltage supply of the 12 V vehicle electrical system is thus
no longer dependent on
the engine speed of the combustion engine when driving.
Another difference is that the starter motor and auxiliary battery form an
independent 12 V vehicle
electrical system, which is connected to the standard 12 V vehicle electrical
system by the charging
unit for the auxiliary battery (Battery Charge Unit (BCU) ).
System overview
G20 PHEV, system wiring diagram, 12 V voltage supply
- Digital Motor Electronics (DME)
- Integrated supply module (PDM)
- Starter motor
- Power distribution box, engine compartment
- Jump start terminal point
- Electric motor
- Electric Motor Electronics (EME)
- Power distribution box, inner
- Body Domain Controller (BDC)
- Charger unit for auxiliary battery (Battery Charge Unit)
- Hybrid-specific fuse
- Power distribution box, rear
- Hybrid power distribution box
- Safety battery terminal 2 (SBK2)
- Auxiliary battery
- Intelligent battery sensor 2 (IBS2)
- Intelligent Battery Sensor (IBS)
- Battery
- Safety battery terminal (SBK)
- Power distribution box, front left
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Starter motor
The combustion engine B46 can be started via the conventional starter motor
and the electrical
machine.
The following table shows when and under which conditions the respective start
Terminal control from driver's view
Vehicle condition - DRIVING
Vehicle condition - RESIDING
Vehicle condition - PARKING
Transitional condition for establishing driving readiness,
ending driv
The bus systems of the G20 PHEV are based on the bus systems of the G20. All
the main and sub-bus systems of the G20 are also used in the G20 PHEV. Compared
to the bus systems of the G20,
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Concept
Within the physical limits, the system helps to
keep the vehicle on a steady course by reducing
engine speed and by braking the individual
wheels.
General information
DSC detects the following unstable driving conditions,
for instance:
Fishtailing, which can lead to oversteering.
Loss of
Concept
Areas that should be driven around can be specified
as areas to be avoided.
General information
Stored areas to be avoided can be activated and
deactivated.
Defining an area to be avoided
1. Select the area to be bypassed on the map.
2. Press the button on the
Controller.
3. Press the Co