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Apparatus for detecting a condition of burning in an internal combustion engine

  • US 6,104,195 A
  • Filed: 04/08/1997
  • Issued: 08/15/2000
  • Est. Priority Date: 05/10/1995
  • Status: Expired due to Term
First Claim
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1. An apparatus for detecting a burning condition, comprising:

  • a pair of opposed electrodes provided in a combustion chamber of an internal combustion engine;

    an AC voltage source that applies an AC voltage between the pair of opposed electrodes, the AC voltage being used for detection of an ion current;

    a current detector that detects a current flowing between the opposed electrodes, and outputs a current representing signal containing an AC current component associated with the AC voltage and a burning ion current component; and

    an ion current component detector that detects the ion current component by eliminating the AC current component from the current detected by the current detector.

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