BMW 3: 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 drivetrain in the event of faults and unstable driving conditions
- Control of the internal subcomponents by the EME control unit
- Supply of the 12 V electrical system via the DC/DC converter
- Control of the electrical machine (engine speed, torque) using DC/AC converter
- High-voltage power management
- Contacting the electrical machine
- Contacting the high-voltage battery unit
- Charging the high-voltage battery unit when driving (by energy recovery)
- Communication with other control units, in particular DME, SME and DSC
- Cooling for Electrical Machine Electronics
- Activation of the electric coolant pump for cooling the EME
- Activating the electrical vacuum pump
- Activating the shutoff valve for the vehicle interior
- Evaluation of the second Intelligent Battery Sensor
- Active evaluation of the signal for the high-voltage interlock loop
- Active and passive discharging of the link capacitor to voltages less then 60 V
- Self-test and diagnosis.
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DC/DC converter
The DC/DC converter in the Electrical Machine Electronics of the G20 PHEV is
able to adopt the
following operating modes:
Standby (also in the event of a component fault or short circuit, powe
Power electronics for activation of the electrical machine
The power electronics for the activation of the electrical machine are mainly
made up of the
bidirectional DC/AC converter. It is a pulse converter with a 2-pin DC voltage
connection and a 3-phase
A
High-voltage power management
The power management for the high-voltage vehicle electrical system includes
two subfunctions: one
for driving and one for charging mode.
In driving mode, the energy flows from the high-voltage batt
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Displays and operation
The function does not have any separate display or operating elements. The
function is only available
in the HYBRID ECO PRO driving mode. The function cannot be deactivated.
Recuperation is displayed as usual in the instrument cluster below the
drive-ready state indicator
(CHARGE area).
Switching on/off and interrupting
cruise control
With steering and traffic jam
assistant: Assisted Driving
General information
This button is used to switch the
configured
function on and off.
The button can be used to set the
primarily
used function.
Set function
1. When the system is active,
press the
button repeatedly until the desired funct
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