Hyundai Ioniq: Exhaust Emission Control System / CVVT (Continuously Variable Valve Timing) System. Description and operation

Hyundai Ioniq (AE) 2017-2025 Service Manual / Engine Electrical System / Exhaust Emission Control System / CVVT (Continuously Variable Valve Timing) System. Description and operation

Description

Continuous Variable Valve Timing (CVVT) system advances or retards the valve timing of the intake and exhaust valve in accordance with the ECM control signal which is calculated by the engine speed and load.

By controlling CVVT, the valve over-lap or under-lap occurs, which makes better fuel economy and reduces exhaust gases (NOx, HC) and improves engine performance through reduction of pumping loss, internal EGR effect, improvement of combustion stability, improvement of volumetric efficiency, and increase of expansion work.

This system consist of

–	the CVVT Oil Control Valve (OCV) which supplies the engine oil to the cam phaser or runs out the engine oil from the cam phaser in accordance with the ECM PWM (Pulse With Modulation) control signal,

–	the CVVT Oil Temperature Sensor (OTS) which measures the engine oil temperature,

–	and the Cam Phaser which varies the cam phase by using the hydraulic force of the engine oil.

The engine oil getting out of the CVVT oil control valve varies the cam phase in the direction (Intake Advance/Exhaust Retard) or opposite direction (Intake Retard/Exhaust Advance) of the engine rotation by rotating the rotor connected with the camshaft inside the cam phaser.

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.

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
Driving Condition	Valve Timing	Effect	Valve Timing	Effect
(1) Low Speed /Low Load	Completely Advance	* Valve Under-lap * Improvement of combustion stability	Completely Retard	* Valve Under-lap * Improvement of combustion stability
(2) Part Load	Retard	* Increase of expansion work * Reduction of pumping loss * Reduction of HC	Retard	* Reduction of pumping loss
(3) Low Speed /High Load	Retard	* Increase of expansion work	Advance	* Prevention of intake back flow (Improvement of volumetric efficiency)
(4) High Speed /High Load	Advance	* Reduction of pumping loss	Retard	* Improvement of volumetric efficiency

Catalytic Converter. Description and operation

DescriptionThe catalytic converter of the gasoline engine is a three way catalyst. It oxidizes carbon monoxide and hydrocarbons (HC), and separates oxygen from the oxides of nitrogen (NOx)...

GPF (Gasoline Particulate Filter). Description and operation

DescriptionThe Gasoline Particulate Filter (GPF) system prevents Particulate Matter (PM) from being discharged to the atmosphere and consists of a filter assembly, two Exhaust Gas Temperature Sensors (EGTS)...

Other information:

Hyundai Ioniq (AE) 2017-2025 Owner's Manual: Low Tire Pressure Warning Light

This warning light illuminates: When you place Engine Start/Stop button to the ON position. - It illuminates for approximately 3 seconds and then goes off. When one or more of your tires are significantly underinflated. This warning light remains ON after blinking for approximately 60 seconds, or repeatedly blinks ON and OFF in 3 second intervals: • When there is a malfunction with the TPMS...

Hyundai Ioniq (AE) 2017-2025 Owner's Manual: Wireless Cellular Phone Charging System

There is a wireless cellular phone charger inside the front console. The system is available when all doors are closed, and when the Engine Start/Stop button is in the ACC/ON/START position. To charge a cellular phone The wireless cellular phone charging system charges only the Qi-enabled cellular phones ()...