Apparatus for detecting fuel dielectric constant

Abstract

In a fuel dielectric constant detecting apparatus, a high frequency signal is applied to an element for subjecting the high frequency voltage signal to resonance corresponding to the dielectric constant of the fuel. A DC voltage is applied to the subjecting element so that the duty of the high frequency signal be 50%, and the high frequency signals are so controlled that the phase shift between the signals provided at both ends of the resistor be a predetermined value. Alternatively, in the apparatus, the high frequency signal applying member includes a high frequency signal applying section and a reference high frequency signal applying section. The frequencies to the subjecting element are so controlled that the phase shift between the high frequency signal at the connecting point of the resistor and the subjecting element and the reference high frequency signal be equal to a phase shift between the high frequency signal applied to the subjecting element through the resistor and the reference high frequency signal, and those frequencies thus controlled or amounts of control for determining the latter are utilized to detect the dielectric constant of the fuel.

Dependencies are inferred from the claim text.