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Air/fuel control with adaptively learned reference

  • US 5,396,875 A
  • Filed: 02/08/1994
  • Issued: 03/14/1995
  • Est. Priority Date: 02/08/1994
  • Status: Expired due to Fees
First Claim
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1. An air/fuel control method for an internal combustion engine, comprising the steps of:

  • adjusting fuel delivered to the engine in response to a comparison of an output from an exhaust gas oxygen sensor to an adaptively learned reference signal;

    generating said adaptively learned reference signal by determining a linear interpolation between a first signal and a second signal; and

    generating said first signal by storing said sensor signal as said first signal when said sensor signal is greater than a previously stored first signal and holding said first signal when said sensor signal is less than a previously stored reference signal and decreasing said first signal at a predetermined rate when said sensor signal is greater than said previously stored reference signal but less than said previously stored first signal.

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