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Apparatus for detecting fuel dielectric constant

  • US 5,313,168 A
  • Filed: 11/06/1992
  • Issued: 05/17/1994
  • Est. Priority Date: 11/06/1991
  • Status: Expired due to Term
First Claim
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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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