BMW 3: 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 option is used:
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Auxiliary battery
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G20 PHEV, auxiliary battery
- Safety battery terminal 2 (SBK2)
- Auxiliary battery
- Intelligent battery sensor 2 (IBS2)
The energy required by the starter motor is provided by the auxiliary battery. It is installed in the luggage compartment. The auxiliary battery is a lead-acid battery with a capacity of 60 Ah.
Similar to the 12 V battery, the current, voltage and terminal temperature of the auxiliary battery are measured by an intelligent battery sensor (IBS2). The results are then forwarded via local interconnect network bus to the superior control unit, the Electrical Machine Electronics (EME). The EME forwards the signal via CAN bus to the DME.
In the event of an accident of sufficient severity, the safety battery terminal (SBK2) ensures the disconnection of the positive battery cable between the auxiliary battery and starter motor. The safety battery terminal (SBK2) is located directly at the positive terminal of the auxiliary battery. The pyrotechnic activation of the safety battery terminal (SBK2) for the auxiliary battery is effected by the Advanced Crash Safety Module (ACSM).
The intelligent battery sensor (IBS2) receives the voltage supply via a line with a small cross-section from the safety battery terminal (SBK2) of the auxiliary battery.
A change of the auxiliary battery must always be registered.
The positive battery cable runs from the safety battery terminal (SBK2) to the starter motor.
Three other lines also leave from the safety battery terminal (SBK2):
- One as a voltage supply for IBS2 (without fuse).
- One to the BCU to charge the auxiliary battery (with 60 A fuse).
- One to the EME (with 5 A fuse).
Battery charging unit
The charger unit for auxiliary battery consists of a control unit and a unidirectional DC/DC converter; it connects the start-up system with the standard vehicle electrical system. The charger unit for auxiliary battery is installed in the luggage compartment on the right-hand side.
More information is available in the chapter 9.3 "New control units in the G20 PHEV".
Jump start terminal point
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G20 PHEV jump start terminal point
Next to the jump start terminal point is a label displaying the correct/incorrect polarity.
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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
Bus Systems
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,
New schematic diagram
The representation of the individual bus systems and their designations have
been adapted to the
representation and the designation of the ISTA workshop information system.
The following table provi
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Telephone functions
General information
Mobile phones can be connected to the vehicle
via Bluetooth, see Owner's Manual for the vehicle.
At high temperatures, the charge function of the
mobile phone can be limited where appropriate
and functions are no longer executed.
Do not operate a mobile phone that is connected
Coasting
Concept
Under certain conditions the engine is automatically
decoupled from the transmission in the D
selector lever position. The vehicle continues
traveling with the engine idling to reduce consumption.
Selector lever position D remains engaged.
This driving condition is referred to as coasting.
