BMW 3: Low-voltage Vehicle Electrical System
BMW 3 Series G20 (2018-2026) Training manual / Low-voltage Vehicle Electrical System
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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 al
Start-up system
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 for driving readiness
Terminal control from driver's view
Vehicle condition - DRIVING
Vehicle condition - RESIDING
Vehicle condition - PARKING
Transitional condition for establishing driving readiness,
ending driv
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Parked-car ventilation
Concept
The car's interior can be cooled or heated before
driving off with the parked-car ventilation. Depending
on set temperature and ambient temperature,
the car's interior is ventilated or possibly
heated using the residual engine heat.
General information
The system can be switched on and off d
Tasks
The Electrical Machine Electronics is made up internally of three
subcomponents:
Bidirectional DC/AC converter
Unidirectional DC/DC converter
EME control unit
The Electrical Machine Electronics performs the following functions using the
subcomponents
mentioned:
Torque restriction of the dri
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