Hyundai Ioniq: Hybrid Control System / Description and operation

Hyundai Ioniq (AE) 2017-2024 Service Manual / Hybrid Control System / 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 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]

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

Hybrid Control System

Specifications

SpecificationsBrake Switch▷ Type : ON/OFF Switch▷ Specification Item Brake Pedal Release Brake Pedal Push Switch 1 Max...

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