Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Effect of Boosted Intake Pressure on Stratified Combustion of a Gasoline Direct Injection Engine

가솔린 직접분사 엔진의 흡기과급이 성층화 연소에 미치는 영향

  • 조남효 (고등기술연구원 기계의용기술센터) ;
  • 박형철 (고등기술연구원 기계의용기술센터) ;
  • 김미로 (고등기술연구원 기계의용기술센터)
  • Published : 2003.03.01
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Abstract

The effects of pressure charge on combustion stability and emissions have been analyzed using a GDI single cylinder engine. A late injection mode of stratified condition at the air-fuel ratio of 40:1 for 1200∼2400 rpm was tested while the boosted pressure ratio was increased up to 1.5:1. In-cylinder CFD analysis was also performed for better understanding of in-cylinder flow and fuel spray behavior. With a higher boosted pressure ratio the IMEP was increased greatly due to the increased engine load, and the ISFC was improved by more than 10% at all engine speeds. The regime of stable stratified combustion was extended to a higher engine speed, but the spark ignition angle had to be more advanced for stable combustion. The emissions of ISHC and ISNOx did not show a particular trend for the increased engine speed but a general trend of lower ISHC and higher ISNOx for a gasoline engine.

Keywords

References

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