Dual HEGO method for identification and mitigation of air-fuel imbalance faults
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United States of America Patent
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May 16, 2017
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Jan 21, 2016
app pub date -
Jul 17, 2014
filing date -
Jul 17, 2014
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Abstract
Systems and methods for identifying and mitigating air-fuel imbalance faults specific to an engine cylinder are provided. In one embodiment, a method comprises indicating a cylinder imbalance by comparing time-aligned readings from exhaust gas oxygen sensors, the exhaust gas oxygen sensors positioned symmetrically opposite each other within an exhaust passage downstream of a catalyst. In this way, an air-fuel imbalance fault may be accurately detected in a non-uniform exhaust flow so that mitigating actions can be taken, resulting in reduced tailpipe emissions.
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