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밀러사이클 적용 스파크점화기관의 후기 흡기밸브 닫힘각 변화에 따른 연소성능 연구
정진호 ( J H Chung ),강선제 ( S J Kang ),김진수 ( J S Kim ),정석철 ( S C Jeong ),이진욱 ( J W Lee ) 한국액체미립화학회 2015 한국액체미립화학회지 Vol.20 No.3
In order to research engine characteristics of spark-ignited engine with intake valve closing timing change for Miller cycle, two cam for LIVC (Late Intake Valve Closing) were designed and fabricated an prototype valvetrain. And intake valve closing timing were adjusted to build low compressing and high expansion cycle for HEV. In experimental study, it were investigated with different engine speed, spark timing and air-fuel ratio to compare base cam and LIVC cam type. It was found that the volumetry efficiency and effective work of compression process were decreased in case of LIVC cam. When compared with the existing results, the maximum pressure in the cylinder was reduced about 12~13 bar and the volumetric efficiency was reduced about 16%.
LIVC 적용 밀러사이클 스파크점화기관의 유동특성 연구
정진호 ( J. H. Chung ),강선제 ( S. J. Kang ),김진수 ( J. S. Kim ),정석철 ( S. C. Jeong ),이진욱 ( J. W. Lee ) 한국분무공학회 2016 한국액체미립화학회지 Vol.21 No.1
In this study, to research in-cylinder flow characteristics of spark-ignited engine with intake valve closing timing change for Miller cycle. 3D simulation study were used 6 different intake valve profile with CAD10° gap for retard intake valve closing timing. Comparison of In-cylinder flow pattern characteristic were accompanied between Base and LIVC. And the efficiency of volume and the work of compression were analyzed with simulation study. When intake valve closing angle was retarded in CAD50°, the pressure in cylinder was decreased about 12~13 bar and volume efficiency was reduced about 16%. The efficiency of volume and the work of compression were reduced on LIVC.