Chrysler Motors Corporation

Acustar, Inc.

James R Garrison

Blane K McCoy

A fuel gauge damper circuit takes a variable resistance signal from a fuel tank sending unit, develops an input voltage proportional to the variable resistance and generates a filtered average of the input voltage at the fuel gauge damper output. The circuit damps undesirable large swings in the input voltage caused by 'sloshing' in the fuel tank. Additionally, the damper circuit features power-up initialization apparatus for eliminating erroneous gauge indications which would otherwise occur upon the initiation of vehicle engine cranking. Also, a return to zero circuit is provided which drives the fuel gauge to zero after the engine is turned off in order to begin the gauge operation from zero when the engine is turned on.

Fuel gauge damper circuit with a return to zero gauge circuit

A fuel gauge damper circuit takes a variable resistance signal from a fuel tank sending unit, develops an input voltage proportional to the variable resistance and generates a filtered average of the input voltage at the fuel gauge output. The circuit damps undesirable large swings in the input voltage caused by 'sloshing' in the fuel tank. Additionally, the damper circuit features power-up initialization apparatus for eliminating erroneous gauge indications which would otherwise occur upon the initiation of vehicle engine cranking.

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Hazelgreen, AL, United States of America

James R Garrison