A simple impedance method for determining ethanol and regular gasoline mixtures mass contents

摘要

A simple electric impedance sensor embedded in ethanol and regular gasoline blends for determining mass ratios was built and tested in the present work. It was earned out a quantitative evaluation of mixtures for several fuel mass ratios in the temperature range of -10 to 40 deg C. A non-linear dimensionless electrical conductivity-fuel mass ratio correlation was obtained for a 0-100 percent ethanol mass content in gasoline. Tests at different temperatures showed that the temperature had an important influence over the mixture bulk conductivity and sensor signal. This work was earned out following the Brazilian automotive industry trend of using ethanol-gasoline mixtures at any proportion to power passenger automobile engines.