Apparatus for detecting fuel dielectric constant
First Claim
1. An apparatus for detecting dielectric constant of a fuel, said apparatus comprising:
- means for applying a high frequency voltage signal;
means for subjecting the high frequency voltage signal from said applying means to resonance corresponding to the dielectric constant of the fuel;
a resistor having one end connected in series to said subjecting means and the other end to which the high frequency voltage signal is applied from said applying means;
bias control means connected to the other terminal of said subjecting means for applying a bias DC voltage to said subjecting means;
detecting means connected between said one and the other ends of said resistor for detecting a phase shift between said high frequency voltage signal of said applying means and a voltage signal provided in a connecting line between said subjecting means and said resistor;
control means for controlling the high frequency voltage signal from said applying means to adjust the phase shift detected by said detecting means to a first predetermined value, at least one of said applying means and control means producing a signal representative of the dielectric constant of the fuel.
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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.
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Citations
8 Claims
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1. An apparatus for detecting dielectric constant of a fuel, said apparatus comprising:
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means for applying a high frequency voltage signal; means for subjecting the high frequency voltage signal from said applying means to resonance corresponding to the dielectric constant of the fuel; a resistor having one end connected in series to said subjecting means and the other end to which the high frequency voltage signal is applied from said applying means; bias control means connected to the other terminal of said subjecting means for applying a bias DC voltage to said subjecting means; detecting means connected between said one and the other ends of said resistor for detecting a phase shift between said high frequency voltage signal of said applying means and a voltage signal provided in a connecting line between said subjecting means and said resistor; control means for controlling the high frequency voltage signal from said applying means to adjust the phase shift detected by said detecting means to a first predetermined value, at least one of said applying means and control means producing a signal representative of the dielectric constant of the fuel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification