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Nonlinear dynamic transform for correction of crankshaft acceleration having torsional oscillations

  • US 5,699,253 A
  • Filed: 04/05/1995
  • Issued: 12/16/1997
  • Est. Priority Date: 04/05/1995
  • Status: Expired due to Fees
First Claim
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1. A method for obtaining corrected rotation quantities in a misfire detector for an internal combustion engine, said engine having a crankshaft with a first crankshaft section being damped with respect to torsional oscillations, said engine further having a crankshaft position sensor generating position signals at predetermined rotational positions of said crankshaft, said crankshaft position sensor being juxtaposed with a second crankshaft section where torsional oscillations have a greater magnitude than at said first crankshaft section, said method comprising the steps of:

  • measuring rotation quantities corresponding to individual cylinder events during operation of said engine;

    correcting said measured rotation quantities to remove periodic position irregularities;

    applying a nonlinear transform to said corrected measured rotation quantities to estimate acceleration values occurring at said first crankshaft section; and

    detecting misfire using said estimated rotation quantities.

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