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Home >> Kia >> 2021 >> Rio LX >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Exhaust Emission Control System >> CVVT (Continuously Variable Valve Timing) System >> Description And Operation >> Operation Principle >> CVVT System Mode

CVVT System Mode

G13704592Courtesy of KIA MOTORS AMERICA, INC.
G13704593Courtesy 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
 Middle
  1. * Valve Under-lap
  2. * Improvement of combustion stability
(2) Part Load Retard
  1. * Reduction of HC
 Retard
  1. * Reduction of pumping loss
(3) Low Speed/High Load Completely Advance
  1. * Reduction of pumping loss
 Advance
  1. * Prevention of intake back flow (Improvement of volumetric efficiency)
(4) High Speed/High Load Completely Advance
  1. * Reduction of pumping loss
 Advance
  1. * Prevention of intake back flow (Improvement of volumetric efficiency)
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