http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
반응 표면법을 이용한 2 단 분사 PCCI 디젤엔진의 운전조건의 영향도 평가에 대한 연구
이재현(Jaehyeon Lee),김형민(Hyungmin Kim),이기형(Kihyung Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
It is well known that Premixed Charge Compression Ignition (PCCI) diesel engines according to many technologies such a change in injection timing, multiple injection strategy, cooled EGR, intake charging and SCV have the potential to achieve homogeneous mixture in the cylinder which result in lower NOx and PM as well as performance improvements. This may generate merely the infinite number of experimental conditions. The use of Response Surface Methodology (RSM) technique can considerably pull down the number of experimental set and time demand. This paper presents the effects of both fuel injection and engine operation conditions on the combustion and emissions in the PCCI diesel engine system. The experimental results have revealed that a change in fuel injection timing and multiple injection strategy along with various operating conditions affect the combustion, emissions and BSFC characteristics in the PCCI engine.
분사시기와 분사량 비에 따른 PCCI의 연소 및 배기 특성에 관한 연구
김형민(Hyungmin Kim),이재현(Jaehyeon Lee),이기형(Kihyung Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As world attention has focused on global warming and air pollution, high efficiency diesel engines with low CO₂ emissions have become more attractive. Premixed diesel engines in particular have the potential to achieve the more homogeneous mixture in the cylinder which results in lower NOx and soot emission. It is well known that the injection strategies such as the injection timing and times are important to create the optimal mixture formation for a PCCI (Premixed Charge Compression Ignition) engine. In this research, we investigated the effect of injection timing, injection times and ratio on the combustion and exhaust gas in a direct injection type PCCI engine using the multiple injection strategy. The experimental results showed that the combustion, fuel consumption and emission characteristics in the PCCI engine were dominantly affected by the fuel injection timing, times and ratio.
흡기밸브 닫힘시기 지각과 운전조건이 2단 분사 PCCI 엔진에 미치는 영향에 관한 연구
김형민(Hyungmin Kim),이재현(Jaehyeon Lee),김기범(Kibum Kim),이기형(Jaehyeon Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
As world attention has focused on global warming and air pollution, high efficiency diesel engines with low CO2 emissions have become more attractive. Premixed diesel engines in particular have the potential to achieve the more homogeneous mixture in the cylinder which results in lower NOx and soot emission. Early studies have shown that the operation conditions such as the EGR, intake conditions, injection conditions and compression ratio are important to reduce emissions in a PCCI (Premixed Charge Compression Ignition) engine. In this study a modified cam was employed to reduce the effective compression ratio. While opening timing of the intake valve was fixed, closing timing of the intake valve was retarded 30°. Although Atkinson cycle with the retarded cam leads to a low in-cylinder pressure in the compression stroke, the engine work can still be increased by advancing injection timing. On that account, we investigated effect of various operating parameters for reduce emission and fuel consumption, as it could be achieved with low NOx at the same level fuel consumption and PM.