KIA Niro: Hybrid Motor Control System

Kia Niro - First generation - (DE) (2017-2022) - Service and Repair Manual / Hybrid Motor System / Hybrid Motor Control System

Description

  • The Hybrid Power Control Unit (HPCU), composed of various components, is the core device among the Power Electronics devices that acts as the brain.
  • It comprises of the Hybrid Control Unit (HCU), an inverter Motor Control Unit (MCU), the Generator Control Unit (GCU)) and the Low-voltage DC-DC Converter (LDC).

Component

Component
location

  1. HPCU (Hybrid Power Control Unit) (LDC+MCU+HCU+Reservoir)
  2. Hybrid drive motor
  3. Hybrid starter generator (HSG)
  4. Electrical radiator
  5. Electric water pump (EWP)

Components

  1. HPCU (Hybrid Power Control Unit)
  2. HPCU tray
  3. HPCU cover
  4. Integrated board (MCU / HCU / LDC)
  5. Shield plate
  6. Capacitor
  7. Current sensor module
  8. Gate board + Power module
  9. Heat sink (water - cooled)
  10. LDC (Low voltage DC - DC Converter)
  11. High - voltage junction box

Inverter (MCU)

  • An inverter supplies AC current to the drive motor and HSG.
  • Depending on the driving conditions, the drive motor and HSG of the integrated board (control board) may act as a generator.

Integrated board (control board)

  • One CPU controls two motors (drive motor and HSG)
  • Sensors send the position, current, and temperature information to the CPU. The CPU generates the pulse width modulation signal and sends it to the gate board.

Capacitor

  • Capacitor is an energy storage device for smoothing the current.

Current sensor

  • Current sensor measures the current that flows through the motor, and is attached to each phase of a 3 - phase busbar.

Power module

  • Power module has six switches that are used to convert DC current to AC current.

Heat sink

  • Heat sink dissipates the heat of the coolant and is located between the power module and the cooling path.

Repalcement

  1. Replace the HPCU.

    (Refer to Hybrid Control System- "Hybrid Power Control Unit")

Removal

Warning

  • Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
  • Be sure to shut off the high voltage before doing any work related with the high voltage system (Refer to "High Voltage Shut-off Procedure") . Failure to follow the safety instructions may result in serious electrical injuries.
  1. Remove the hybrid power control unit (HPCU).

    (Refer to Hybrid Control System - "Hybrid Power Control Unit (HPCU)")

Warning

MCU is integrated into the HPCU and cannot be disassembled. Refer to "HPCU" for the removal or installation of MCU.

Installation

Warning

  • Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
  • Be sure to shut off the high voltage before doing any work related with the high voltage system (Refer to "High Voltage Shut-off Procedure") . Failure to follow the safety instructions may result in serious electrical injuries.
  1. Install the hybrid power control unit (HPCU).

    (Refer to Hybrid Control System - "Hybrid Power Control Unit (HPCU)")

Warning

MCU is integrated into the HPCU and cannot be disassembled. Refer to "HPCU" for the removal or installation of MCU.

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