BMW 3: Introduction
Although the high-voltage battery unit of the G20 PHEV can also be partially charged by energy recovery via the electrical machine, the "normal" charging procedure takes place when the G20 PHEV is connected to the AC voltage network of the local power supply company. Energy is taken from the alternating current voltage network and fed to the direct current voltage high-voltage electrical system.
To allow this to happen, the G20 PHEV can be connected to an AC charge station or charged via the charging cable.
The charging procedure is never carried out with the maximum possible charge current. At the start, charging takes place with constant current. Switchover to constant voltage takes place towards the end. The actual charging time is increased as a result, and the service life of the battery cells is extended.
If the G20 PHEV is connected to an AC charging station, the maximum possible charging power of approximately 3.7 kW is also available (provided the AC charging station is designed for this).
System wiring diagram
System wiring diagram for AC charging with 3.7 kW
- Electric A/C compressor (EKK)
- Electrical Heating (EH)
- Electric motor
- Electric Motor Electronics (EME)
- Battery management electronics (SME)
- High-voltage battery unit
- Convenience charging electronics (KLE)
- Drive, connector fastener
- Drive, charging socket cover
- Charging socket cover sensor
- Locator and status lighting
- Charging socket at the vehicle
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Introduction
The "charging" procedure for an electric vehicle corresponds to "refuelling"
a conventionally driven
vehicle. Accordingly, in this chapter "charging" means:
Charging the high-voltage battery unit d
Overview of charging options
The high-voltage battery unit of the G20 PHEV can generally only be charged
by alternating current
(AC charging) at a maximum charging power of 3.7 kW. The charging option for the
high-vol
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Adapted control units
It was necessary to adapt the IHKA to enable activation of the electric A/C
compressor (EKK) in all
operating conditions. The electric A/C compressor control unit communicates with
the IHKA via the
LIN bus.
To be able to show additional displays for driving readiness, electric driving,
brake ene
Power electronics in the convenience charging electronics
The power electronics for the conversion of the AC voltage from the charging
socket to direct current
voltage, which is required for charging the high-voltage battery unit, are
housed in the convenience
charging electronics. The AC voltage is supplied as a single phase. The input
voltage, which c
