Operation Principle

WARNING: This page is about a different variant/trim than selected.

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.

Information

The variable force solenoid (VFS) changes its force depending on the PWM duty to control the stroke of the OCV.
It also controls the lock, unlock, advanced, retarded, and holding functions.

Intake CVVT

Courtesy of HYUNDAI MOTOR AMERICA
Exhaust CVVT

Courtesy of HYUNDAI MOTOR AMERICA

[CVVT System Mode]

Courtesy of HYUNDAI MOTOR AMERICA

Courtesy of HYUNDAI MOTOR AMERICA

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