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In this study, to research in-cylinder flow characteristics of spark-ignited engine with intake valve closing timing changefor Miller cycle. 3D simulation study were used 6 different intake valve profile with CAD10° gap for retard intake valveclosing timing. Comparison of In-cylinder flow pattern characteristic were accompanied between Base and LIVC. And theefficiency of volume and the work of compression were analyzed with simulation study. When intake valve closing anglewas retarded in CAD50°, the pressure in cylinder was decreased about 12~13 bar and volume efficiency was reduced about16%. The efficiency of volume and the work of compression were reduced on LIVC.  LIVC : Late Intake Valve ClosingEIVC : Early Intake Valve Closing 1.  1.1               .    , , , ,         (1) .                 ,          .                 . Fig.1       .    EIVC     LIVC. EIVC           ,           . , LIVC

A Study on Flow Characteristics of Spark-Ignited Engine with Variable Intake Valve Closing Timing for Miller Cycle