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Method and system for controlling combustion engines

  • US 5,769,049 A
  • Filed: 09/17/1996
  • Issued: 06/23/1998
  • Est. Priority Date: 01/18/1995
  • Status: Expired due to Term
First Claim
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1. A method for controlling combustion engines by detection of the present air/fuel ratio, A/F, within the combustion chambers of the combustion engine, the air/fuel ratio being determined at least partly from an evaluation of the output signal from an ionization sensor arranged within the combustion chamber, which method comprises:

  • measuring an output signal, UION, from the ionization sensor;

    determining from the output signal for each combustion of the combustion chamber a characteristic parameter characteristic of a fundamental frequency during at least a part of a flame ionization phase occurring during each combustion, a richer than a stoichiometric ratio of A/F being indicated when the characteristic parameter corresponds to a fundamental frequency higher than a predetermined value and a leaner than a stoichiometric ratio of A/F being indicated when the extracted parameter corresponds to a fundamental frequency lower than a predetermined value; and

    controlling the combustion engine in accordance with the characteristic parameter.

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