BMW 3 Owners & Service Manuals

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.


     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


     Concept, General information, Safety information

    Concept The system monitors tire inflation pressure in the four mounted tires. The system warns you if there is a loss of pressure in one or more tires. General information Sensors in the tire valves measure the tire inflation pressure and tire temperature. The system detects the mounted tires auto

     Integrated key

    General information The driver's door can be locked and unlocked without the vehicle key using the integrated key. The integrated key also fits the glove compartment. Safety information Warning For some country versions, unlocking from the inside is only possible with special knowledge. Persons w

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