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Home >> Kia >> 2015 >> Soul Base, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Auxiliary Emission Control Systems >> Exhaust Emission Control System - 1.6L >> CVVT (Continuously Variable Valve Timing) System >> Description and Operation >> [CVVT System Mode]
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[CVVT System Mode]

Fig 1: Engine Load Versus Engine Speed Graph
G09777698Courtesy of KIA MOTORS AMERICA, INC.
Fig 2: CVVT System Mode Operation Graph
G09777699Courtesy of KIA MOTORS AMERICA, INC.
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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