흡기밸브 닫힘 시기와 분사조건이 PCCI 엔진의 성능에 미치는 영향에 관한 연구A Study on effect of the intake valve timing and injection conditions on the PCCI engine performance
- Other Titles
- A Study on effect of the intake valve timing and injection conditions on the PCCI engine performance
- Authors
- 이재현; 김형민; 김영진; 이기형
- Issue Date
- Mar-2010
- Publisher
- 한국액체미립화학회
- Keywords
- Premixed charge compression ignition; LIVC (Late intake valve closing); EGR; Injection strategy; 예혼합 압축착화; 흡기 밸브 닫힘 시기 지연; 배기가스 재순환; 분사전략
- Citation
- 한국액체미립화 학회지, v.15, no.1, pp.1 - 7
- Indexed
- KCI
- Journal Title
- 한국액체미립화 학회지
- Volume
- 15
- Number
- 1
- Start Page
- 1
- End Page
- 7
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/40310
- ISSN
- 1226-2277
- Abstract
- As world attention has focused on global warming and air pollution, high efficiency diesel engines with low CO2 emissions have become more attractive. Premixed diesel engines in particular have the potential to achieve the more homogeneous mixture in the cylinder which results in lower NOx and soot emission. Early studies have shown that the operation conditions such as the EGR, intake conditions, injection conditions and compression ratio are important to reduce emissions in a PCCI (Premixed Charge Compression Ignition) engine. In this study a modified cam was employed to reduce the effective compression ratio. While opening timing of the intake valve was fixed, closing timing of the intake valve was retarded 30 °. Although Atkinson cycle with the retarded cam leads to a low in-cylinder pressure in the compression stroke, the engine work can still be increased by advanced injection timing. On that account, we investigated the effects of various injection parameters to reduce emission and fuel consumption; as a result, lower NOx emission levels and almost same levels of fuel consumption and PM compared with those of conventional diesel engine cam timing could be achieved with the LIVC system.
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