Modified trimmed mean filtering for misfire detection

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant

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701101, 701110, 731173, G01M 1500, G06F 1900

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active

058625062

ABSTRACT:
A modified trimmed mean filtering method and apparatus for a misfire detection includes acquiring a time-continuous series of acceleration data samples (601) representative of acceleration behavior of a reciprocating engine. And, providing a filtered acceleration data sample (607) dependent on an average acceleration magnitude of a portion of the acceleration data samples bounded within a range of amplitudes and, preferably, a time-centered acceleration data sample (606) of the fixed length time-continuous series of acceleration data samples. A misfire condition can be indicated (409) dependent on a magnitude of the filtered acceleration data sample.

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"Generalized Median Filtering and Related Nonlinear Filtering Techniques" by Young Hoon Lee and Saleem A. Kassam, IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP 33, No. 3, Jun. 1985.

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