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Effects of Two-Stage Injection on Combustion and Exhaust Emission Characteristics in a HCCI Engine  

Kook, Sang-Hoon (Department of Mechanical Engineering, KAIST)
Park, Cheol-Woong (Department of Mechanical Engineering, KAIST)
Choi, Wook (Department of Mechanical Engineering, KAIST)
Bae, Choong-Sik (Department of Mechanical Engineering, KAIST)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.12, no.5, 2004 , pp. 32-39 More about this Journal
Abstract
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.
Keywords
HCCI(Homogeneous Charge Compression Ignition); Two-stage injection; Cool flame; Compression ratio; A/F(Air Fuel Ratio);
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