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Methods and systems for an oxygen sensor

  • US 9,181,887 B2
  • Filed: 10/11/2013
  • Issued: 11/10/2015
  • Est. Priority Date: 10/11/2013
  • Status: Active Grant
First Claim
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1. An engine method, comprising:

  • learning a reference point for an intake oxygen sensor at a reference intake pressure during selected engine idling conditions, including correcting an output of the sensor estimated at the reference intake pressure with a correction factor based on ambient humidity; and

    adjusting engine EGR flow, via an EGR valve, based on an intake oxygen concentration estimated by the sensor relative to the learned reference point and a change in intake pressure from the reference intake pressure.

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