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In order to improve the accuracy and reduce the weight of the cross-capacitor fuel level sensor, a novel single-tube cross-capacitor fuel level sensor is designed. Specifically, the fuel level measurement model of the single-tube cross-capacitance sensor is established, and the relationship between the measured liquid level and the sensor output capacitance is derived. Then, a finite element analysis model is constructed to solve the capacitance output of the sensor. The results of experiments conducted demonstrate that the output capacitance value of the designed single-tube cross-capacitive sensor changes linearly in the range 0-14 pF, with linearity ± 0.8%, hysteresis error ± 0.1%, and maximum reference error –1.0% FS at a liquid level of 120 mm. The optimized structural parameters were as follows: plate gap angle θ = 2⁰, quartz tube inner radius R0 = 11.5 mm, quartz tube thickness R1 – R0 = 1.6 mm, and sensitivity = 0.0723 pF/mm (representing an 11.1% increase after optimization). The cross-capacitive fuel level sensor developed in this study is both lightweight and high precision.
PAPER REVISED: 2019-08-11
PAPER ACCEPTED: 2019-09-03
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THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 3, PAGES [1577 - 1584]
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© 2021 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence