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Misfire sensing apparatus for an internal combustion engine

  • US 5,213,081 A
  • Filed: 09/23/1992
  • Issued: 05/25/1993
  • Est. Priority Date: 09/27/1991
  • Status: Expired due to Term
First Claim
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1. A misfire sensing apparatus for an internal combustion engine comprising:

  • a crank angle sensor for generating an output signal at predetermined crank angles of a crankshaft of said engine;

    cylinder identifying means for identifying operating states of a plurality of cylinders of said engine based on the output signal from said crank angle sensor;

    adjusting means for adjusting an engine operating parameter so as to control the respective operations of said cylinders;

    misfire sensing means for sensing misfire information relating to misfiring in each of said cylinders and determining possible misfiring in a cylinder based on the misfire information, said misfire sensing means being operable such that when there is possible misfiring in a cylinder, it controls said adjusting means so as to adjust said engine operating parameter by a predetermined value, compares misfiring information as sensed before and after the adjustment, and determines an occurrence of true misfiring if a difference in the misfiring information before and after the adjustment is less than a predetermined reference value.

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