Hyundai Ioniq (AE): Hybrid Control System / Description and operation

Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual / Hybrid Control System / Description and operation

Hybrid Electric Vehicle (HEV)
The Hybrid Electric Vehicle (HEV) uses hybrid power source (Engine, Electric motor), so its fuel efficiency is relatively high and exhaust emission is very small compared to the traditional vehicle which uses only engine as power source. It consists of the engine, motor, high voltage battery and control modules.
In Electric Vehicle (EV) mode, the HEV is driven by only the electric motor, but engine supports the motor in case the vehicle needs more power (HEV Mode).
The electric motor not only drives the vehicle but also generates electric energy during regenerative braking for charging the high voltage battery.

[HEV Operation Mode and Power Flow]

[Warning Lamp]

Items
Description
Related Control Module
1. MIL Lamp

•
Lamp ON : Engine Management System (EMS) fault
ECM, TCM, OPU, HCU, MCU, BMS, AAF
2. Service Lamp

•
Lamp ON : Hybrid related system fault
HCU, MCU, BMS, LDC, OPU
3. READY Lamp

•
After ignition START
–
Lamp ON : HEV in normal condition is ready to drive (Engine may or may not start)
–
Lamp OFF : HEV is not ready to drive
•
During driving
–
Lamp ON : HEV is ready to drive
–
Lamp Blinking : HEV in faulty condition (HEV in limited operating mode)
–
Lamp OFF : HEV is not ready to drive
 HCU
4. EV MODE Lamp

•
Lamp ON : EV mode (Electric motor only)
•
Lamp OFF : HEV mode (Engine running)
HCU

    Procedure for entering engine forced activation modeIf the engine needs to be running constantly while the vehicle is stopped to inspect emission gas or perform maintenance on the vehicle, follow below procedure to enter engine forced activation mode.

    SpecificationsHybrid Control SystemBrake Switchâ–· Type : ON/OFF Switchâ–· Specification Item Brake PedalRelease Brake PedalPush Switch 1Max.

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