Fuel mixing ratio detecting device

Details Fuel mixing ratio detecting device Fuel mixing ratio detecting device

1995-05-08

1997-01-14

Chilcot, Richard

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

73 6161, G01R 2726

Patent

active

055941630

ABSTRACT:
A fuel mixing ratio detecting device can detect a fuel mixing ratio of a mixed fuel with high precision, regardless of the value of an electric conductivity of the fuel. The device comprises a sensor portion (an LC resonance circuit) having an electrostatic capacity detecting portion for detecting an electrostatic capacity of the fuel, which fills a space between electrodes, and a coil connected in parallel with the electrostatic capacity detecting portion, a voltage-controlled oscillator for generating a high-frequency signal having a predetermined frequency by performing a voltage control operation, a phase comparator for detecting a phase difference between a voltage and a current of the high-frequency signal applied to the sensor portion A, a target value switching unit for changing a phase difference target value between a first target value of 0.degree. and a second target value other than 0.degree., a control unit for controlling the voltage control operation of the voltage-controlled oscillator according to a difference between the phase difference detected by the phase comparator and the set target value, and a computing unit for computing a dielectric constant of the fuel from the frequency of the high-frequency signal when the phase difference has the first target value and for computing the electric conductivity of the fuel from an amount of shift between the frequency of a first high-frequency signal when the phase difference has the first target value and the frequency of a second high-frequency signal when the phase difference has the second target value and for detecting the mixing ratio of the fuel from the computed dielectric constant and the computed electric conductivity.

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