Effect of Fuel Composition on Vaporization Behavior in Gasoline Engines—Analyzing In-cylinder Gas Composition by High Speed Gas Sampling System—

概要

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To investigate the effect of fuel composition on mixture formation in the intake port-injection gasoline engine, engine tests with in-cylinder gas sampling were conducted using 10 types of model gasoline consisting of 13 hydrocarbon components, and the hydrocarbon components in the cylinder gas sampled before ignition were analyzed by gas chromatography. Hydrocarbon components with higher boiling point tended to have lower evaporated fractions under all test conditions, and m-xylene with boiling point of 139 °C and components with higher boiling point may influence the total amount of vaporized fuel under the low temperature engine oil/water conditions found during cold starting. Comparison of the quantities of evaporated components from experiments found very good agreement with values from numerical calculations based on equations derived from the saturated vapor pressures of components. In conclusion, the vaporization characteristics of hydrocarbon components of fuels in an engine may be determined by the saturated vapor pressures.