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Home >> Kia >> 2012 >> Sedona EX >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Auxiliary Emission Control Systems >> Exhaust Emission Control System >> Continuously Variable Valve Timing (CVVT) System >> Description And Operation >> CVVT System Mode
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CVVT System Mode

Fig 1: CVVT System Graph
G07388974Courtesy of KIA MOTORS AMERICA, INC.
Fig 2: CVVT System Operation Conditions
G07388975Courtesy of KIA MOTORS AMERICA, INC.
DRIVING CONDITION REFERENCE

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		 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
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