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과급을 이용한 저온 디젤 연소의 운전영역 확장 및 연료소비율 저감
심의준(Euijoon Shim),한상욱(Sangwook Han),장진영(Jinyoung Jang),박정서(Jungseo Park),배충식(Choongsik Bae) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Supercharging system was adopted to investigate the influence of boost pressure on operating range, brake specific fuel consumption (BSFC) and exhaust emissions by using a supercharger at low temperature diesel combustion (LTC) condition in a 5-cylinder 2.7 L direct injection diesel engine. The experimental parameters such as injection quantity, injection timing, injection pressure and exhaust gas recirculation (EGR) rate were varied to find maximum operating range. The result showed that operating range with boost was expanded up to 41.9% compared to naturally aspirated LTC condition due to increased mixing intensity. The boosted LTC engine showed low BSFC value and dramatically reduced soot emission under all operating range compared with high speed direct injection (HSDI) mode. Finally, this paper presents the boosted LTC map of emission and the strategy of improved engine operating range.
저온 디젤 연소를 이용한 직접분사식 디젤엔진의 운전영역 제시
심의준(Euijoon Shim),한상욱(Sangwook Han),장진영(Jinyoung Jang),박정서(Jungseo Park),배충식(Choongsik Bae) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study investigates the low temperature diesel combustion with influence of ultra-high exhaust gas recirculation and injection pressure on the exhaust emissions and operating range in a 5-cylinder 2.7L direct injection diesel engine. Simultaneous reduction of nitrogen oxide and Soot emissions were achieved using the ultra-high EGR which can reduce in-cylinder temperature. However, higher hydrocarbon and carbon monoxide were also observed at the same time. And when adopting EGR of over 65% or oxygen content of under 9%, soot emission were re-increased due to in-complete combustion. When engine operation speed was low, soot emission was reduced as increasing the injection pressure because fuel was easy to atomize. The operating range of low temperature diesel combustion was reduced at the high load engine operation. And it was observed similar BSFC value at the low load engine operation.
장진영(Jinoyoung Jang),심의준(Euijoon Shim),한영덕(Youngduk Han),김득상(Duksang Kim),이동인(Dongin Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In this study, the experimental study of low-temperature combustion using low-pressure exhaust gas recirculation (LP-EGR) additionaly was evaluated in heavy-duty diesel engine for construction machine. Test engine has six cylinders was equipped with LP/HP-EGR, variable turbine geometry (VTG) and high-pressure common rail injection system. For this research, 1-D simulation is also used to estimate and design the performance; such as EGR rate and power. Nitrogen oxide and smoke emissions, which were chronic problem of diesel engine, were reduced by higher EGR rate with HP-EGR. Additionally, Nitrogen oxide emission was decreased by LP-EGR. At the same time, engine power varied a little and EGR rate was increased.