Hyundai Ioniq: Hybrid Control System / Description and operation

Hyundai Ioniq (AE) 2017-2024 Service Manual / Hybrid Control System / Hybrid Control System / Description and operation

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 and Clutch Pressure Sensor (CPS) 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]
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
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

    Hybrid Control System



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