Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Kia >> 2014 >> Rio EX, 4D Hatchback >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Exhaust Emission Control System >> CVVT (Continuously Variable Valve Timing) System >> Description and Operation >> CVVT System Mode

CVVT System Mode

Fig 1: CVVT System Characteristics Graph (1 Of 2)
G08321329Courtesy of KIA MOTORS AMERICA, INC.
Fig 2: CVVT System Characteristics Graph (2 Of 2)
G08321330Courtesy 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
scientia non olet · About Mike's Workshop Manuals