Phase Diagrams of Different Modes of Misfire Calculated from the Digital Fourier Transformation of Angular Crankshaft Velocity

2010-01-0167

04/12/2010

Event
SAE 2010 World Congress & Exhibition
Authors Abstract
Content
Certain harmonics of angular crankshaft velocity are indicative of engine imbalance induced by cylinder misfire. Application of the Digital Fourier Transformation (DFT) facilitates the production-feasible calculation of a singular index in the frequency domain indicative either of smooth engine operation or misfire. The phase of that particular index with proper interpretation directly points to a misfiring cylinder. The identification of a misfiring pair, either opposing or a non-opposing in the cylinder bank, requires a bit more sophisticated approach since the phase response of the characteristic index in the frequency domain becomes more complex. The method demonstrated here was successfully applied in real time in four-, six-, and eight-cylinder engines, both SI and Diesel, for the On-Board Diagnostic application with reliability exceeding relevant regulatory requirements.
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DOI
https://doi.org/10.4271/2010-01-0167
Pages
11
Citation
Malaczynski, G., and Van der Poel, R., "Phase Diagrams of Different Modes of Misfire Calculated from the Digital Fourier Transformation of Angular Crankshaft Velocity," SAE Technical Paper 2010-01-0167, 2010, https://doi.org/10.4271/2010-01-0167.
Additional Details
Publisher
Published
Apr 12, 2010
Product Code
2010-01-0167
Content Type
Technical Paper
Language
English