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.

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