밀러사이클 적용 스파크점화기관의 후기 흡기밸브 닫힘각 변화에 따른 연소성능 연구

• Published in: 한국분무공학회지 Vol. 20; no. 3; pp. 141 - 148
• Main Authors: 정진호, J H Chung, 강선제, S J Kang, 김진수, J S Kim, 정석철, S C Jeong, 이진욱, J W Lee
• Format: Journal Article
• Language: Korean
• Published: 한국분무공학회 30.09.2015; 한국액체미립화학회
• Subjects: Cam profile; Late intake valve closing; Miller cycle; Variable valve timing; 가변밸브 개폐시기; 기계공학; 밀러 사이클; 캠 형상; 후기 흡기밸브 닫힘
• ISSN: 1226-2277; 2288-9051
• DOI: 10.15435/JILASSKR.2015.20.3.141

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%.