Fuel carbon pathway in the first cranking cycle of a gasoline direct injection engine
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IJER-15-0098_fuel_accounting_paper_reviewed_2nd_submission_no_highlights.pdf
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754.44 KB
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Adobe PDF
Checksum (MD5)
3be75b2c7ebd8047e8b70f104f8bd29d
Author(s)
Rodriguez, Juan Felipe
Cheng, Wai K.
Date Issued
October 2015
Journal
International Journal of Engine Research
Publisher
Sage Publications
Citation
Rodriguez, J. F., and W. K. Cheng. “Fuel Carbon Pathway in the First Cranking Cycle of a Gasoline Direct Injection Engine.” International Journal of Engine Research (October 8, 2015).
Version
Author's final manuscript
Abstract
The fuel carbon pathway for the cold-start first cranking cycle in a gasoline direct injection engine is characterized quantitatively. The engine is fired for a single cycle in one cylinder at a specified cranking speed and at a coolant temperature of 20 °C. The fuel carbon is accounted for from measurements of the exhaust carbon (CO[subscript 2], CO, and hydrocarbon). The remaining carbon is assumed to go into the oil and crankcase. The parameters studied are the amount of injected fuel, the injection timing, the intake pressure, the injection pressure, and the cranking speed. Substantial fuel enrichment is needed to produce stable combustion in the first cycle, with significant residual fuel that goes into preparing the mixture of the second cycle and into the oil and crankcase. The first cycle hydrocarbon emissions as a fraction of the fuel are not sensitive to the fuel enrichment, the manifold absolute pressure, and the injection pressure.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Sloan Automotive Laboratory
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1177/1468087415609852
