![Kia Optima: [CVVT System Mode] - CVVT (Continuously Variable Valve Timing) System. Description
and Operation - Exhaust Emission Control
System - Emission Control System - Kia Optima TF 2011-2024 Service Manual](images/pages/small/3.png)
Kia Optima: [CVVT System Mode]
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(1) Low Speed / Low Load |
(2) Part Load |
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(3) Low Speed / High Load |
(4) High Speed / High Load |
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Driving Condition |
Exhaust Valve |
Intake Valve |
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Valve Timing |
Effect |
Valve Timing |
Effect |
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(1) Low Speed /Low Load |
Completely Advance |
* Valve Under-lap * Improvement of combustion stability |
Completely Retard |
* Valve Under-lap * Improvement of combustion stability |
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(2) Part Load |
Retard |
* Increase of expansion work * Reduction of pumping loss * Reduction of HC |
Retard |
* Reduction of pumping loss |
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(3) Low Speed /High Load |
Retard |
* Increase of expansion work |
Advance |
* Prevention of intake back flow (Improvement of volumetric
efficiency) |
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(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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h3 {color:#0033CC}
h2 {color:#008000}
h1 {color:#FF0000}
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See also:
Uniform Tire Quality Grading
The following information relates to the tire grading system developed by the
National Highway Traffic Safety Administration (NHTSA) for grading tires by tread
wear, traction and temperature perfo ...
Rear Window Defroster
The defroster heats the window to remove frost, fog and thin ice from the interior
and exterior of the rear window. The ignition switch must be on for the defroster
to operate.
To activate the ...
Instrument Panel Illumination
When the vehicle’s parking lights or headlights are on, the instrument panel
lights activate. This makes the instruments and controls visible in darkness. To
adjust the instrument panel illumina ...
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