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Effect of Boosted Intake Pressure on Stratified Combustion of a Gasoline Direct Injection Engine  

조남효 (고등기술연구원 기계의용기술센터)
박형철 (고등기술연구원 기계의용기술센터)
김미로 (고등기술연구원 기계의용기술센터)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.11, no.2, 2003 , pp. 48-55 More about this Journal
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
Gasoline direct injection engine; Boosted intake pressure; Combustion stability; Stratified combustion; In-cylinder CFD;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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