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Signal processing method for an engine knock signal

  • US 7,676,323 B2
  • Filed: 05/08/2007
  • Issued: 03/09/2010
  • Est. Priority Date: 05/08/2007
  • Status: Expired due to Fees
First Claim
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1. A method of processing a knock signal produced by an engine knock sensor to determine a magnitude of the knock signal at a specified knock frequency for knock detection, comprising the steps of:

  • anti-alias filtering the knock signal to pass a range of knock signal frequencies including the specified knock frequency;

    sampling and digitizing the filtered knock signal to form a series digital samples for DFT-processing;

    characterizing a specified knock detection interval as a combination of at least first and second processing windows of fixed and identical duration with a variable amount of overlap;

    DFT-processing said digital samples over said first processing window to form a first knock signal magnitude, and DFT-processing said digital samples over said second processing window to form a second knock signal magnitude; and

    combining said first and second knock signal magnitudes to form the knock signal magnitude for knock detection.

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