2단분사법에 따른 예혼합압축착화엔진의 연소 및 배기특성Effects of Two-Stage Injection on Combustion and Exhaust Emission Characteristics in a HCCI Engine

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HCCI (Homogeneous Charge Compression Ignition) combustion has a great advantage in reducing NOx (Nitrogen Oxides) and PM (Particulate Matter) by lowering the combustion temperature due to spontaneous ignitions at multiple sites in a very lean combustible mixture. However, it is difficult to make a diesel-fuelled HCCI possible because of a poor vaporability of the fuel. To resolve this problem, the two-stage injection strategy was introduced to promote the ignition of the extremely early injected fuel. The compression ratio and air-fuel ratio were found to affect not only the ignition, but also control the combustion phase without a need for the intake-heating or EGR (Exhaust Gas Recirculation). The ignition timing could be controlled even at a higher compression ratio with increased IMEP (Indicated Mean Effective Pressure). The NOx (Nitrogen Oxides) emission level could be reduced by more than 90 % compared with that in a conventional DI (Direct Injection) diesel combustion mode, but the increase of PM and HC (Hydrocarbon) emissions due to over-penetration of spray still needs to be resolved.
Publisher
한국자동차공학회
Issue Date
2004-09
Language
Korean
Citation

한국자동차공학회 논문집, v.12, no.5, pp.32 - 39

ISSN
1225-6382
URI
http://hdl.handle.net/10203/24589
Appears in Collection
ME-Journal Papers(저널논문)
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