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Lambda control by skip fire of unthrottled gas fueled engines

  • US 5,553,575 A
  • Filed: 06/16/1995
  • Issued: 09/10/1996
  • Est. Priority Date: 06/16/1995
  • Status: Expired due to Term
First Claim
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1. A method of optimizing the excess air ratio (λ

  • ) for a gaseous fuel-powered internal combustion engine, said engine having a number (N) of cylinders, said method comprising;

    (A) ascertaining prevailing engine operating conditions;

    (B) determining, based upon said prevailing engine operating conditions, an optimum fraction of cylinders (OFF) required to be fired to cause an actual value of λ

    to at least approach an optimum value of λ



    OPT);

    then(C) determining a number (M) of cylinders that the firing of which must be skipped to produce said OFF, M being less than N; and

    then(D) eliminating a firing and fueling cycle in said M number of cylinders only.

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