05343156 is referenced by 5 patents and cites 5 patents.

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.

IC for producing an output voltage related to fuel composition in a capacitive fuel sensor
Application Number
Publication Number
Application Date
April 15, 1992
Publication Date
August 30, 1994
Chun Foong Cheah
1420 Turk St., #905, San Francisco, 94115
Nick M Johnson
11663 Par Ave., Los Altos, 94024
G01R 27/26
View Original Source