Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1978-03-09
1980-04-29
Ruehl, Charles A.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
324 61R, G01F 2326
Patent
active
041999843
ABSTRACT:
Digital circuitry for use primarly in measuring the volume of gasoline in an automobile fuel tank. A measurement capacitor is mounted in the fuel tank to have its capacitance vary with the level of gasoline in the tank and forms part of a multivibrator circuit the repetition rate of which is consequently varied in an inverse manner with the capacitance of the measurement capacitor. Pulses generated in the multivibrator are fed to a counter coupled to a resetting circuit which is triggered by an output of this counter when a predetermined number of the said pulses has been counted so that a train of resetting signals are generated separated by intervals the length of which is a measure of the capacitance of the measurement capacitor. Further pulse generating means of fixed repetition rate is gated by the resetting signals and the resultant batches of pulses supplied to a digital display device which displays a reading representative of the number of pulses in each of the said batches, so that the display number is dependent on the capacitance of the measurement capacitor and hence on the level of gasoline in the tank. The capacitor is so shaped and arranged that the capacitance thereof is determined by the fuel level is representative of the volume of fuel in the tank.
REFERENCES:
patent: 3140608 (1964-07-01), Clark
patent: 4080563 (1978-03-01), Marsh et al.
"Modern Methods of Capacitance Measuring" by Raven Electronic Services Products Ltd.--1975. _
"An Analog/Digital Integrated Circuit Interface for Automotive Sensors" by Rabe, SAE Paper No. 760069--1975. _
Fielden Electronics Ltd. Catalog of "Telstor Level Controller/Indicators types E401, E402 & Ancillary Equipment". _
"Digital Processing of Differential Transducer Signals" Owen Instrumentation, vol. IECI24, No. 1, Feb. 1977. _
Huddart John
Huddart Robin
O'Connell Robert F.
Ruehl Charles A.
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