Kia Optima: Description - CVVT (Continuously Variable Valve Timing) System. Description 
		and Operation - Exhaust Emission Control 
		System - Emission Control System - Kia Optima TF 2011-2021 Service ManualKia Optima: 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 consists 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,
- the Cam Phaser which varies the cam phase by using the hydraulic force of the engine oil.
The engine oil coming 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. It does this by rotating the rotor connected with the camshaft inside the cam phaser.


CVVT (Continuously Variable Valve Timing) System. Description and Operation
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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 contro ...

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