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Sooting Tendencies in an Air-Forced Direct Injection Spark-Ignition (DISI) Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 06, 2000 by SAE International in United States
Annotation ability available
Event: SAE 2000 World Congress
Particulate emissions are reported for a 0.31 L single cylinder engine fitted with an air forced direct injection system. Trends in number, size, and mass of engine out particle emissions are examined as a function of injection timing, spark timing, and EGR. Injection timing determines to a large degree the nature of the combustion, with early injection leading to homogeneous like combustion and late injection producing stratified charge combustion. As fuel injection is retarded, at a fixed lean air to fuel ratio, PM emissions decline to a minimum at an injection time well within the compression stroke, after which they rapidly increase. In the heavily stratified regime, the PM increase can be attributed to a growing number of rich zones that occur in the progressively more inhomogeneous fuel mixture. At fixed injection timing, advancing the spark causes a general increase in particle emissions. This trend is opposite that of hydrocarbons, which decrease significantly as spark timing is advanced. A limited examination of the effect of EGR shows it to reduce NOx. However, PM, CO, and hydrocarbon emissions all increase with added EGR, which is linked to a loss in combustion stability. The PM emissions trends for the air assisted direct injection presented here are compared to those previously reported for a production fuel only DISI gasoline engine.
CitationMatti Maricq, M., Munoz, R., Yang, J., and Anderson, R., "Sooting Tendencies in an Air-Forced Direct Injection Spark-Ignition (DISI) Engine," SAE Technical Paper 2000-01-0255, 2000, https://doi.org/10.4271/2000-01-0255.
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