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Engine combustion state detection device

  • US 20050193804A1
  • Filed: 03/07/2005
  • Published: 09/08/2005
  • Est. Priority Date: 03/08/2004
  • Status: Active Grant
First Claim
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1. A combustion state detection device for an internal combustion engine, comprising:

  • a rotation speed detection means for producing a rotation speed signal varying with a rotation speed of a crankshaft of an internal combustion engine, the rotation speed signal containing a first frequency component synchronized with combustion cycles of the internal combustion engine and a second frequency component which is higher in frequency than the first frequency component;

    an extracting means for extracting the second frequency component; and

    a state detecting means for detecting a combustion state of the internal combustion engine on the basis of the extracted second frequency component.

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