디젤 예혼합 압축착화 엔진에서 배기가스 재순환과 과급의 영향Effect of EGR and Supercharging on the Diesel HCCI Combustion

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Homogeneous charge compression ignition(HCCI) combustion is an advanced technique for reducing the hazardous nitrogen oxide(NOx) and particulate matter(PM) in a diesel engine. NOx could be reduced by achieving lean homogeneous mixture resulting in combustion temperature. PM could be also reduced by eliminating fuel-rich zones which exist in conventional diesel combustion. However previous researches have reported that power-output of HCCI engine is limited by the high intensive knock and misfiring. In an attempt to extend the upper load limit for HCCI operation, supercharging in combination with Exhaust Gas Recirculation(EGR) has been applied: supercharging to increase the power density and EGR to control the combustion phase. The test was performed in a single cylinder engine operated at 1200 rpm. Boost pressures of 1.1 and 1.2 bar were applied. High EGR rates up to 45% were supplied. Most of fuel was injected at early timing to make homogeneous mixture. Small amount of fuel injection was followed near TDC to assist ignition. Results showed increasing boost pressure resulted in much higher power-output. Optimal EGR rate influenced by longer ignition delay and charge dilution simultaneously was observed.
Publisher
한국자동차공학회
Issue Date
2006-09
Language
Korean
Citation

한국자동차공학회 논문집, v.14, no.5, pp.58 - 64

ISSN
1225-6382
URI
http://hdl.handle.net/10203/24488
Appears in Collection
ME-Journal Papers(저널논문)
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