Capacitive fuel composition sensor with padding capacitor

Details Capacitive fuel composition sensor with padding capacitor Capacitive fuel composition sensor with padding capacitor

1990-11-16

1992-02-18

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324605, 324690, 73 611R, G01R 2726, G01N 2722

Patent

active

050897837

ABSTRACT:
In a fuel composition sensor in which a fast step voltage is applied to a capacitive voltage divider comprising a sensor capacitance and a reference capacitance in series, a padding capacitor is connected in parallel with the sensor capacitor to produce a more linear output across the full range of fuel composition. The value of the padding capacitor is sufficient to produce a capacitance ratio of the voltage divider substantially less than one and, in particular, less than two thirds.

REFERENCES:
patent: 2720624 (1955-10-01), Gunst et al.
patent: 3816811 (1974-06-01), Omelik
patent: 4001676 (1977-01-01), Hile et al.
patent: 4470300 (1984-09-01), Kobayashi
patent: 4915084 (1989-04-01), Gonze
patent: 4939467 (1990-07-01), Noglami et al.
patent: 4939468 (1990-07-01), Takeuchi
patent: 4971015 (1990-11-01), Gonze
SAE Paper 900231, "Intelligent Alcohol Fuel Sensor", 2/90, esp pp. 3-7.
IEE Transactions On Vehicular Technology, vol. VT-27, No. #Aug./78, "An On-Board Sensor for Percent Alcohol", pp. 142-144.

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