BMW 3: Cooling
To guarantee the thermal operating safety of the electrical machine in every situation, it is cooled with coolant in the G20 PHEV. For this, the electrical machine is integrated in the coolant circuit of the transmission.
To cool the stator coils, the transmission oil is directed through a coolant duct between the stator support and the housing of the automatic transmission. The coolant duct is sealed at the front and back with two sealing rings.
The rotor is also cooled by transmission oil, which absorbs heat energy in the form of oil mist and dissipates it to the ambient air at the transmission oil cooler.
G20 PHEV, cooling of the electrical machine
- Transmission oil cooler
- Electric motor
- Connection of transmission oil lines (for cooling the electrical machine)
- Automatic transmission
- Connection of transmission oil lines (for cooling the automatic transmission)
- Transmission oil thermostat
- Automatic transmission housing
- Transmission oil duct electrical machine
- Stator support
Service information
The lid in front of the electrical machine cannot be opened in Service. All work at the electrical machine, the additional torsional vibration damper, the separation clutch, as well as at the rotor position sensor itself, is prohibited. In the event of a fault with one of these components, the entire automatic transmission must be replaced.
Before removing the automatic transmission, the electrical safety rules must be applied.
After replacement of the automatic transmission or the Electrical Machine Electronics, the rotor position sensor must be adjusted with help of the diagnosis system.
The dual-mass flywheel can be replaced separately. Always proceed in accordance with the current repair instructions.
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Introduction
The Electrical Machine Electronics (EME) is primarily used as control
electronics for the electrical
machine. It is also responsible for converting the direct current voltage from
the high-voltage b
Connections
The connections at the Electrical Machine Electronics can be divided into
four categories:
Low-voltage connections
High-voltage connections
Connection for potential compensation line
Connections
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Driving out of a parking space
using the parking assistant
Concept
The system makes driving out of parallel parking
spaces easier.
General information
Steptronic transmission
The parking assistant calculates an optimal line
for pulling out of a parking space and takes control
of the following functions during the maneuver:
Steering.
Accelerating and brak
Data protection
Data transfer
Concept
The vehicle offers different services, whose use
requires a data transfer to BMW or a service provider.
The data transfer can be deactivated for
some services.
General information
When the data transfer is deactivated, the respective
service cannot be used.
Only make these se
