BMW 3 Owners & Service Manuals

BMW 3: Convenience charging electronics

The convenience charging electronics (KLE) enables communication between the vehicle and charging station.

General information on charging
Convenience charging electronics KLE

  1. Ventilation opening
  2. Low-voltage connection/signal connection
  3. High-voltage connection for the electrical heating
  4. Coolant connection (return)
  5. High-voltage connection electric A/C compressor
  6. Coolant connection (feed)
  7. High-voltage connection for the Electrical Machine Electronics
  8. High-voltage connection charging socket

The convenience charging electronics is a high-voltage component

General information on charging
High-voltage component warning sticker

Each high-voltage component has on its housing an identifying label that enables Service employees and vehicle users to intuitively identify the possible hazards that can result from the high electric voltages used.

Only Service employees who satisfy all the prerequisites are permitted to work on the designated high-voltage components: suitable qualifications, compliance with the safety rules, procedure following the exact repair instructions.

For reasons of high-voltage safety and the warranty, the convenience charging electronics must not be opened or otherwise dismantled.

The main tasks of the convenience charging electronics are:

  • Communication with electric vehicle supply equipment via a pilot line and charging plug detection line
  • Actuation of the charge status indicator
  • Detection of the status of the charging socket cover
  • Activation of the electric motor for locking the charging plug
  • Converting the AC voltage into direct current voltage (AC/DC converter)
  • Supplying the electric A/C compressor with high voltage
  • Supplying the electrical heating with high voltage.

General information on charging
G20 PHEV, convenience charging electronics input/output

  1. Electric Vehicle Supply Equipment (EVSE)
  2. Information whether the AC voltage network is available and the charging cable is correctly connected, as well as the maximum available current level
  3. Electric Motor Electronics (EME)
  4. Requested charging power, charging voltage and charging current level (setpoint values)
  5. Body Domain Controller (BDC)
  6. Terminal status, driving readiness switched off
  7. Dynamic Stability Control (DSC)
  8. Vehicle speed
  9. Digital Motor Electronics (DME)
  10. Status of parking lock
  11. Convenience charging electronics (KLE)
  12. Charging socket
  13. Status of the charging socket cover and the charging plug
  14. Electric Motor Electronics (EME)
  15. Actual value of the set charging power, charging voltage and charging current level, charging release
  16. Digital Motor Electronics (DME)
  17. Information whether the charging cable is connected and the charging procedure is active
  18. Charging socket
  19. Activation of the LED for locator lighting and charging status display, activation of the charging plug lock
  20. Instrument panel
  21. Signals for the display of charging information

Communication with EVSE via pilot line and line for charging plug detection

The pilot line and charging plug detection line are realized as single signal lines. These signal lines are shielded and are terminated at a connector in the convenience charging electronics.

When charging plug is plugged into the vehicle's charging socket, this is detected by the charging plug detection line; the maximum current carrying capacity of the charging cable is also determined. An ohmic resistor is connected in the connector of the charging cable between the proximity connection and the PE conductor. The convenience charging electronics applies a measurement voltage and calculates the resistance value in the line for the charging plug detection. The resistance value specifies which maximum current level is allowed for the charging cable used (dependent on the wire cross-section). The assignment of resistance - current level is specified in the standard IEC 61851-1 ed.3.

The pilot line is required for the determination and transmission of the maximum available charging current level. The pilot signal is a bipolar rectangle signal (-12 V to +12 V). The voltage and the duty cycle are used for communicating different states between the EVSE and the vehicle:

  • High-voltage electric vehicle is ready to charge (Yes/No)
  • Fault present (Yes/No)
  • Maximum charge current which can be provided by the AC voltage network
  • Charge current
  • Charging complete.


     Coordinating the charging procedure

    Coordination for starting and ending the charging procedure is performed by the high-voltage power management in the EME. The following actions required by the customer at the start of the charging

     Actuation of the charge status indicator

    The convenience charging electronics actuate the charge status indicator. Locator lighting: The locator lighting of the charging socket is used as an orientation aid by the driver for the connection

     Power electronics in the convenience charging electronics

    The power electronics for the conversion of the AC voltage from the charging socket to direct current voltage, which is required for charging the high-voltage battery unit, are housed in the conveni



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