Knock Detection Using Spectral Analysis Techniques on a Texas Instruments TMS320 DSP

Paper #:
  • 960614

Published:
  • 1996-02-01
Citation:
Horner, T., "Knock Detection Using Spectral Analysis Techniques on a Texas Instruments TMS320 DSP," SAE Technical Paper 960614, 1996, https://doi.org/10.4271/960614.
Author(s):
Pages:
10
Abstract:
An efficient method of detecting engine knock using spectral analysis is presented. Multiple single-point DFTs are used to condition the measured knock signal. Using multiple frequencies in the detection algorithm provides a better signature of the combustion process and enhances the ability to detect low-level knock across the entire operating range of the engine. The detection strategy compares the DFT outputs to a variable reference to determine a knock intensity metric. Unlike currently used techniques, the algorithm adapts the reference (no-knock condition) to varying engine speeds and loads. An overview of the knock detection problem and current technology is presented.
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