Capacitive type fuel probe compensation circuit

Details Capacitive type fuel probe compensation circuit Capacitive type fuel probe compensation circuit

1979-05-21

1980-07-29

Woodiel, Donald O.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

361284, G01F 2326

Patent

active

042144795

ABSTRACT:
A full height compensation circuit for a capacitive type probe of the type used to measure the mass of fuel in a tank which includes a probe capacitor for immersion in the fuel connected to a source of power for supplying current to the probe capacitor, the probe capacitor current being summed with a current corresponding to the capacitance of the fuel tank in the empty state to provide an output voltage, the output voltage being positively integrated to a predetermined value as determined by the number of pulses counted by a counter, following which the counter is actuated to count down the number of pulses required to return the integrated output voltage to zero, and the number of pulses counted down providing a digital number output proportional to the mass of fuel sensed by the probe capacitor.

REFERENCES:
patent: 3237178 (1966-02-01), Valentine
patent: 4090408 (1978-05-01), Hedrick

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