Methods and systems for estimating an air-fuel ratio with a variable voltage oxygen sensor
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United States of America Patent
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Jan 9, 2018
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app pub date -
Mar 17, 2017
filing date -
Feb 19, 2015
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Abstract
Methods and systems are provided for estimating an exhaust air/fuel ratio based on outputs from an exhaust oxygen sensor. In one example, a method may include adjusting engine operation based on an air-fuel ratio estimated based on an output of the exhaust oxygen sensor and a learned correction factor. For example, the oxygen sensor may operate in a variable voltage mode in which a reference voltage of the oxygen sensor may be adjusted between a lower first voltage and a higher second voltage, and the learned correction factor is based on the second voltage.
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