Method and system for air fuel ratio control and detecting cylinder imbalance
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United States of America Patent
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Jul 26, 2016
Grant Date -
Apr 28, 2016
app pub date -
Oct 27, 2014
filing date -
Oct 27, 2014
priority date (Note) -
In Force
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Abstract
Air/fuel imbalance monitoring systems and methods for monitoring air/fuel ratio imbalance of an internal combustion engine are disclosed. In one embodiment, adjusting engine operation responsive to cylinder air/fuel imbalance based on a determined total number of instances where sensed peak-to-peak exhaust air-fuel ratios differentials are less than a threshold normalized to a total number of peak-to-peak oscillations. The approach can be used to indicate air/fuel ratio imbalances between engine cylinders.
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