Apparatus and method for diagnosing failure of fuel level...

Details Apparatus and method for diagnosing failure of fuel level... Apparatus and method for diagnosing failure of fuel level...

2007-06-19

2007-06-19

Deb, Anjan K. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S503000

Reexamination Certificate

active

11299387

ABSTRACT:
A method of diagnosing failure of fuel level sensors includes a first measuring step of measuring voltages from first and second failure detection terminals; if the voltage is higher than a reference, diagnosing the voltage as “high,” and if the voltage is lower than a reference, diagnosing the voltage as “low;” and if the voltage is neither high nor low: a second measuring step of receiving the voltages from the first and second failure detection terminals; calculating and storing a difference between the voltages of the first and second failure detection terminals; determining whether an amount of fuel is reduced; if the amount of fuel is reduced, calculating a difference between voltage signals of the first and second failure detection terminals; determining whether the voltage difference before and after the amount of fuel was reduced are identical; and if the voltage differences are identical, returning to the first measuring step.

REFERENCES:
patent: 5421202 (1995-06-01), Le Pimpec
patent: 6136169 (2000-10-01), Okamoto
patent: 55-078140 (1980-06-01), None
patent: 02-130261 (1990-05-01), None
patent: 07-150974 (1995-06-01), None
patent: 07-233764 (1999-09-01), None
patent: 2002-257772 (2002-09-01), None

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