Effects of ethanol content on gasohol PFI engine wide-open-throttle operation
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Author(s)
Cheng, Wai K.
Kar, Kenneth
Ishii, Kaoru
Date Issued
June 2009
Journal
SAE International Journal of Fuels and Lubricants
Publisher
SAE International
Citation
Kar, Kenneth, Wai Cheng, and Kaoru Ishii. "Effects of Ethanol Content on Gasohol PFI Engine Wide-Open-Throttle Operation." SAE International Journal of Fuels and Lubricants, 2(1):895-901, 2009.
Version
Author's final manuscript
Abstract
The NOx emission and knock characteristics of a PFI engine operating on ethanol/gasoline mixtures were assessed at 1500 and 2000 rpm with λ =1 under Wide-Open-Throttle condition. There was no significant charge cooling due to fuel evaporation. The decrease in NOx emission and exhaust temperature could be explained by the change in adiabatic flame temperature of the mixture. The fuel knock resistance improved significantly with the gasohol so that ignition could be timed at a value much closer or at MBT timing. Changing from 0% to 100% ethanol in the fuel, this combustion phasing improvement led to a 20% increase in NIMEP and 8 percentage points in fuel conversion efficiency at 1500 rpm. At 2000 rpm, where knocking was less severe, the improvement was about half (10% increase in NIMEP and 4 percentage points in fuel conversion efficiency). Because there was no significant change in the end gas temperature in these experiments, the gasohol knock resistance was attributed solely to the ignition chemistry of the ethanol.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.4271/2009-01-1907
