Knock Signal Conditioning Using the Discrete Fourier Transform and Variable Detection Window Length 2007-01-1509
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.
Citation: Kearney, 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. Download Citation
Author(s):
Matthew J. Kearney
Affiliated:
Delphi Electronics & Safety
Pages: 9
Event:
SAE World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Electronic Engine Controls, 2007-SP-2087
Related Topics:
Knock
Windows and windshields
Sensors and actuators
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