Kia Niro: Hybrid Control System / Description and operation

Description

The HCU (Hybrid Control Unit) controls whole hybrid systems and is connected with each control modules (ECM, TCM, MCU, BMS ECU etc.) by CAN interface. In addition this system uses the brake switch signals for controlling the hybrid system.

  

CAN interface is divided into hybrid and chassis CAN lines.

The HCU controls power & torque distribution of the engine and motor, regenerative brake, and fail-safe mode based on the vehicle information, driver’s demand, engine information and high voltage battery information.

[HCU Main Functionalities]

Item
Functionality
Demand Torque Determination

Driver Creep Demand Torque Calculation

Driver Acceleration/Deceleration Torque Calculation

Driver Total Demand Torque Calculation

Regeneration Brake Control

Regeneration Brake Demand Torque Control

Regeneration Brake Estimated Torque Calculation

EV/HEV Mode Determination

Engine Crank Condition Determination

Engine Target Operating Status Determination

Battery SOC Balancing

Electric Power Limitation

Charge/Discharge Power Determination

Auxiliary System Power Limitation and Compensation

Engine Operating Point Determination

Engine Target Speed Determination in Idle Load

Engine Target Torque Determination in Part Load

Engine Target Torque Determination in Full Load

Engine Target Torque Determination in Engine Stop or Passive Run

Idle/Racing Charge Control

Idle Charge Control

Racing Charge Control

Engine Start/Stop Control

Crank Method Selection

Speed Control for Cranking Engine

Fuel Injection Control

Engine Stop Control

Engine Firing Complete Determination

Engine Clutch Engage/Slip/Release Control

Synch Engage Control

Launch Engage Control

Engine Brake Engage Control

Engage in Shift

Release Control

Torque Coordination Control

Engine Torque Determination in Transient State

Motor Torque Determination in Transient State

Generator Torque Determination in Transient State

Torque Invention Control

Torque Increase/Decrease Determination

Anti-Shock Control

Parabolic Torque Restriction

Shift Assist Control

Engine Clutch Slip Control

Anti-jerk Control

System Limit Control

Battery Charge/Discharge Limit Control

Engine, Hybrid Drive Motor, HSG Torque Limit Control

Torque Monitoring

Hybrid powertrain torque monitoring

Fail-Safe

Hybrid control system fail-safe control

Auxiliary System Control

Electric Oil Pump Control

Variable Voltage Control of Low Voltage DC/DC

A/C & Heater Control

Brake Boost Control

Cluster Display


Components and components location
Components Location 1. Hybrid Power Control Unit (HPCU) 2. Hybrid Control Unit (HCU) 3. Brake Switch 4. DC Fuse ...

Hybrid Power Control Unit (HPCU) Specifications
Specification Hybrid Power Control Unit (HPCU) Item Specification Operating Voltage (V) 204 - 275.2 Operating F ...

Other information:

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