System and method for flexible fuel ethanol concentration and hardware malfunction detection
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United States of America Patent
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Oct 18, 2016
Grant Date -
Jun 11, 2015
app pub date -
Dec 11, 2013
filing date -
Dec 11, 2013
priority date (Note) -
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Abstract
A system and method for flexible fuel ethanol concentration and hardware malfunction detection compares a current hardware reference value learned based on an air-fuel ratio detected during a pre-fuel mix period with a previous hardware reference value from a previous vehicle driving cycle, and detects a hardware malfunction when a difference between current and previous hardware reference values exceeds a predetermined threshold. The system and method also monitors the air-fuel ratio during a post-fuel mix period, and detects a hardware malfunction when the air-fuel ratio changes by more than a predetermined threshold during the post-fuel mix period. The system and method also compares an observed slope of the air-fuel ratio detected during a fuel mixing period over an amount of fuel consumed with an expected slope when a cold-start is detected, and detects a hardware malfunction when a difference between observed and expected slopes exceeds a predetermined threshold.
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