Hyundai Ioniq (AE): 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.
   
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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
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Driver Creep Demand Torque Calculation
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Driver Acceleration/Deceleration Torque Calculation
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Driver Total Demand Torque Calculation
Regeneration Brake Control
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Regeneration Brake Demand Torque Control
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Regeneration Brake Estimated Torque Calculation
EV/HEV Mode Determination
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Engine Crank Condition Determination
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Engine Target Operating Status Determination
Battery SOC Balancing
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Electric Power Limitation
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Charge/Discharge Power Determination
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Auxiliary System Power Limitation and Compensation
Engine Operating Point Determination
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Engine Target Speed Determination in Idle Load
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Engine Target Torque Determination in Part Load
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Engine Target Torque Determination in Full Load
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Engine Target Torque Determination in Engine Stop or Passive Run
Idle/Racing Charge Control
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Idle Charge Control
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Racing Charge Control
Engine Start / Stop Control
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Crank Method Selection
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Speed Control for Cranking Engine
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Fuel Injection Control
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Engine Stop Control
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Engine Firing Complete Determination
Engine Clutch Engage/Slip/Release Control
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Synch Engage Control
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Launch Engage Control
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Engine Brake Engage Control
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Engage in Shift
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Release Control
Torque Coordination Control
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Engine Torque Determination in Transient State
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Motor Torque Determination in Transient State
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Generator Torque Determination in Transient State
Torque Invention Control
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Torque Increase/Decrease Determination
Anti-Shock Control
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Parabolic Torque Restriction
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Shift Assist Control
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Engine Clutch Slip Control
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Anti-jerk Control
System Limit Control
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Battery Charge/Discharge Limit Control
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Engine, Hybrid Drive Motor, HSG Torque Limit Control
Torque Monitoring
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Hybrid powertrain torque monitoring
Fail-Safe
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Hybrid control system fail-safe control
Auxiliary System Control
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Electric Oil Pump Control
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Variable Voltage Control of Low Voltage DC/DC
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A/C & Heater Control
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Brake Boost Control
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Cluster Display

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

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