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Individual cylinder air/fuel ratio feedback control system

  • US 4,962,741 A
  • Filed: 07/14/1989
  • Issued: 10/16/1990
  • Est. Priority Date: 07/14/1989
  • Status: Expired due to Term
First Claim
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1. A method for correcting air/fuel ratio for each of N cylinders via an oxygen sensor positioned in the exhaust of an internal combustion engine, comprising the steps of:

  • sampling the sensor once each period associated with a combustion event in one of the cylinders to generate N output signals;

    storing each of said N output signals;

    concurrently reading each of said N output signals from said storage once each output period to define N nonperiodic signals each being related to the air/fuel ratio of a corresponding cylinder wherein said output period is defined as a predetermined number of engine revolutions required for each of the cylinders to have a single combustion event;

    generating N feedback correction signals from said N nonperiodic signals; and

    correcting a mixture of air and fuel supplied to each of the cylinders in response to each of said feedback correction signals for achieving a desired air/fuel ratio in each of the cylinders.

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