IC for producing an output voltage related to fuel composition i

Details IC for producing an output voltage related to fuel composition i IC for producing an output voltage related to fuel composition i

1992-04-15

1994-08-30

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324676, 324679, 73 6143, 731181, G01R 2726

Patent

active

053431561

ABSTRACT:
A circuit for responding to the output of a capacitive fuel sensor that can distinguish gasoline from methanol and produces an output that is related to the methanol proportion. The response is independent of the conductivity in the sensor resulting from fuel contamination. A square wave is employed to excite the sensor and the circuit provides for stabilizing the square wave amplitude. The circuit includes an amplitude modulation detector that converts the square wave transients into a fuel composition related voltage output that can be applied to an engine control mechanism that will adjust the automotive engine to operate efficiently with the fuel being supplied. Circuits are shown for linearizing the fuel composition to voltage response and a charge dispenser amplitude modulation detector is described wherein the detection occurs only during the square wave transient interval.

REFERENCES:
patent: 3818877 (1974-06-01), Barrera et al.
patent: 4418569 (1983-12-01), Kuhnel
patent: 4470300 (1984-09-01), Kobayashi
patent: 4806847 (1989-02-01), Atherton et al.
patent: 5033293 (1991-07-01), Honma et al.

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