Hyundai Ioniq (AE): Cylinder Head Assembly / CVVT & Camshaft. Description and operation

Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual / Engine Mechanical System / Cylinder Head Assembly / CVVT & Camshaft. Description and operation

Description
The continuous variable valve timing (CVVT) system advances or retards the opening of an intake or exhaust valve according to the ECM signals that are determined based on engine RPM and load.
Due to CVVT control, a valve overlap or underlap occurs between the intake valve and exhaust valve, resulting in the reduction of pumping loss, recirculation of exhaust gas, improvement in combustion stability and volumetric efficiency, and increase in expansion work. This in turn improves fuel efficiency and engine performance and reduces emission gases (NOx and HC).
The CVVT system is composed of a CVVT oil control valve (OCV), CVVT oil temperature sensor (OTS), and a cam phaser; The OCV receives a pulse width modulation signal from the ECM and controls the flow of oil to supply oil to the cam phaser, the OTS measures the temperature of the engine oil, and the cam phaser changes the phase of the camshaft using the engine oil pressure.
The oil supplied from the CVVT OCV rotates the rotor connected to the camshaft inside the cam phaser. The rotor, in turn, rotates the camshaft in the direction of engine rotation (intake advanced / exhaust retarded) or in the opposite direction of engine rotation (intake retarded / exhaust advanced) to change the phase angle of the cam.

Operation Principle
The CVVT has the mechanism rotating the rotor vane with hydraulic force generated by the engine oil supplied to the advance or retard chamber in accordance with the CVVT oil control valve control.
   
•
A separate solenoid valve is installed on the chain cover in the intake side for closing and releasing a separate lock pin.
1.
Intake CVVT

2.
Exhaust CVVT

[CVVT System Mode]

(1) Low Speed / Low Load
(2) Part Load


(3) Low Speed / High Load
(4) High Speed / High Load



Driving
Condition
Exhaust Valve
Intake Valve
Valve
Timing
Effect
Valve
Timing
Effect
(1) Low Speed
/Low Load
Completely
Advance
* Valve Under-lap
* Improvement of combustion stability
Middle
* Valve Under-lap
* Improvement of combustion stability
(2) Part Load
Retard
* Reduction of HC
Retard
* Delays the closing time of intake valve to reduce pumping loss
(3) Low Speed
/High Load
Completely Advance
* Reduction of pumping loss
Advance
* Improvement of volumetric efficiency
(4) High Speed
/High Load
Completely Advance
* Reduction of pumping loss
Advance
* Improvement of volumetric efficiency

    Components1. Camshaft bearing cap2. Front camshaft bearing cap3. Exhaust camshaft4. Intake camshaft5. Exhaust CVVT assembly6. Intake CVVT assembly

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