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Home >> Hyundai >> 2017 >> Azera Base >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Exhaust Emission Control System >> CVVT (Continuously Variable Valve Timing) >> Description And Operation >> [CVVT System Mode]
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[CVVT System Mode]

Fig 1: CVVT System Mode Chart (1 Of 2)
G12088418Courtesy of HYUNDAI MOTOR AMERICA
Fig 2: CVVT System Mode Chart (2 Of 2)
G12088419Courtesy of HYUNDAI MOTOR AMERICA
Driving Condition Exhaust Valve Intake Valve
Valve Timing Effect Valve Timing Effect
Low Speed/Low Load Completely Advance * Valve Under-lap * Improvement of combustion stability Completely Retard * Valve Under-lap * Improvement of combustion stability
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
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