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Adaptive correction of torsional and wheel profile position irregularities for misfire detection

  • US 5,531,108 A
  • Filed: 04/05/1995
  • Issued: 07/02/1996
  • Est. Priority Date: 04/05/1995
  • Status: Expired due to Term
First Claim
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1. A method of obtaining adaptive correction factors to detect malfunctions in an internal combustion engine, said method comprising the steps of:

  • measuring an engine variable at a plurality of different times to produce raw values of said engine variable;

    correcting said raw values by applying a respective adaptive correction factor to each raw value to produce corrected values;

    selecting one of said adaptive correction factors for updating;

    selecting a block of consecutive corrected values including a particular corrected value that has been corrected using said one selected adaptive correction factor;

    comparing said particular corrected value with other said corrected values of said block; and

    if said particular corrected value is more closely indicative of said malfunction than each of said other corrected values of said block, then updating said particular adaptive correction factor in a first manner without regard to the raw value corresponding to said particular corrected value, otherwise, if said particular corrected value is not more closely indicative of said malfunction than each of said other corrected values of said block, then updating said particular adaptive correction factor in a second manner responsive to said raw value corresponding to said particular corrected value.

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