Kia Optima Manuals

Kia Optima: [CVVT System Mode] - CVVT (Continuously Variable Valve Timing) System. Description and Operation - Exhaust Emission Control System - Emission Control System - Kia Optima TF 2011-2026 Service ManualKia Optima: [CVVT System Mode]

(1) Low Speed / Low Load
 (2) Part Load


(3) Low Speed / High Load
 (4) High Speed / High Load



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
Operation Principle
The CVVT has the mechanism rotating the rotor vane with hydraulic force generated by the engine oil supplied to the advance or retard chamber in accordance with the CVVT oil control valve contro ...

Engine Control/Fuel System
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