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Home >> Kia >> 2020 >> Cadenza Technology >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Auxiliary Emission Control Systems >> Exhaust Emission Control System >> CVVT (Continuous Variable Valve Timing) System >> Description And Operation >> Operation Principle >> CVVT System Mode
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CVVT System Mode

G13403333Courtesy of KIA MOTORS AMERICA, INC.
G13403334Courtesy of KIA MOTORS AMERICA, INC.
Driving Condition Exhaust Valve Intake Valve
Valve Timing Effect Valve Timing Effect
(1) Low Speed/Low Load Completely Advance
  1. * Valve Under-lap
  2. * Improvement of combustion stability
 Completely Retard
  1. * Valve Under-lap
  2. * Improvement of combustion stability
(2) Part Load Retard
  1. * Increase of expansion work
  2. * Reduction of pumping loss
  3. * Reduction of HC
 Retard
  1. * Reduction of pumping loss
(3) Low Speed/High Load Retard
  1. * Increase of expansion work
 Advance
  1. * Prevention of intake back flow (Improvement of volumetric efficiency)
(4) High Speed/High Load Advance
  1. * Reduction of pumping loss
 Retard
  1. * Improvement of volumetric efficiency
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