Method of validating a diagnostic leak detection test for a fuel tank
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United States of America Patent
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Nov 6, 2001
Grant Date -
N/A
app pub date -
Aug 25, 1999
filing date -
Aug 25, 1999
priority date (Note) -
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Abstract
A method of validating a leak detection test for a fuel tank in a vehicle includes the steps of determining a vacuum decay rate of a fuel vapor in the fuel tank and dividing the vacuum decay rate into a set of adjacent segments distributed over a series of consecutive time intervals. The method also includes the steps of determining a slope of the segments, determining if a difference between two consecutive slopes of the segments meets a predetermined criteria, and validating the leak detection test if the difference meets the predetermined criteria.
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