Methods and systems for an oxygen sensor
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United States of America Patent
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-
Feb 20, 2018
Grant Date -
Aug 25, 2016
app pub date -
May 2, 2016
filing date -
Oct 11, 2013
priority date (Note) -
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Abstract
Methods and systems are provided for accurately learning the zero point of an intake gas oxygen sensor during selected engine no-fueling conditions. The learned zero point is used to infer EGR flow and accordingly adjust EGR valve control. In addition, EGR valve leakage is diagnosed based on the zero point learned during a DFSO adaptation relative to a zero point learned during an idle adaptation.
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