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Knock Signal Conditioning Using the Discrete Fourier Transform and Variable Detection Window Length
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2007 by SAE International in United States
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As the speed and memory capabilities of microprocessors have increased, it has become more popular for the signal conditioning of knock sensor outputs to be performed entirely within the microprocessor. One method of this signal conditioning process utilizes the Discrete Fourier Transform (DFT). It is common for systems that use this method to limit the knock detection window to one length across all RPM and load points to reduce computation and memory constraints on the processor. This paper will summarize this method and explain a further enhancement, variable window length, that may become more popular as processor capabilities increase.
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CitationKearney, M., "Knock Signal Conditioning Using the Discrete Fourier Transform and Variable Detection Window Length," SAE Technical Paper 2007-01-1509, 2007, https://doi.org/10.4271/2007-01-1509.
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