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Elemental Composition Determination and Stoichiometric Air-Fuel Ratios of Gasoline Containing Ethanol

Furey & Associates LLC-Robert Furey
GM Powertrain-Pat Geng
Published 2010-10-25 by SAE International in United States
Carbon, hydrogen and oxygen are major elements in modern fuels. Varying combinations of these elements in motor fuel alter the stoichiometric air-fuel ratio (A/F). Stoichiometric A/F ratio is an important parameter in engine calibration affecting vehicle performance, emissions and fuel economy.With increasing use of ethanol in automotive fuels in recent years, since it can be made from renewable feedstocks, oxygen contents in fuel are increasing. Oxygen contents can be around 1.7 mass % in European E5 gasoline or 3.5 mass % in U.S. E10 gasoline and up to 29 mass % in E85 fuel. The increase in oxygen content of fuel has resulted in changes in other physical and chemical properties due to the differences between ethanol and hydrocarbons refined from fossil oil. A previous paper (SAE 2010-01-1517) discussed the change in energy content of automotive fuel and the estimation of net heating values from common fuel properties. This paper will discuss the estimation of elemental composition and stoichiometric A/F ratios of gasoline-ethanol blends from common fuel properties. While the carbon, hydrogen, and nitrogen contents…
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