FUEL GAUGING SYSTEM AT IDENTIFICATION OF FUEL GRADE BY ITS CHARACTERISTIC PARAMETERS Russian patent published in 2003 - IPC

FIELD: aircraft instrumentation engineering; determination of fuel mass in each tank. SUBSTANCE: proposed system is used for measurement of present parameters of fuel by means of sensors mounted in fuel tanks: level, temperature and characteristic parameters ( heat conductivity, dielectric permeability and light absorption). Level of fuel is measured in at least three points not lying on one straight line. Volume of fuel is determined by its level in on- board computer with geometric characteristics of tank taken into account. Grade of fuel or ratio of different grades of fuel is determined in on-board computer by characteristic parameters and temperature. Density of fuel is determined by its grade or mixture of grades and temperature in fuel parameter driver included in on-board computer. Mass of fuel is determined by its density and volume calculated in fuel volume calculator included in on-board computer and in mass calculator also included in on-board computer. Then, total mass of fuel is determined in summing-up unit. EFFECT: enhanced accuracy of determination of fuel mass at temperature and grade spread. 1 dwg