Domestic Journal


Title국상훈, 박철웅, 최욱, 배충식, “2단분사법에 따른 예혼합압축착화엔진의 연소 및 배기특성,” 한국자동차공학회 논문집, vol. 12, No. 5, pp32-39, 2004. 9.

국상훈, 박철웅, 최욱, 배충식, “2단분사법에 따른 예혼합압축착화엔진의 연소 및 배기특성,” 한국자동차공학회 논문집, vol. 12, No. 5, pp32-39, 2004. 9.

Abstract

HCCI (Homogeneous Charge Compressions 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 tow-stage injection strategy was introduced to promote the ignition of the extremely early injected fuel. The compressions 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 compressions 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.

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