Misfire Pattern Recognition in High Performance SI 12-Cylinder Engine

Paper #:
  • 980521

Published:
  • 1998-02-23
Citation:
Moro, D., Azzoni, P., and Minelli, G., "Misfire Pattern Recognition in High Performance SI 12-Cylinder Engine," SAE Technical Paper 980521, 1998, https://doi.org/10.4271/980521.
Pages:
10
Abstract:
This paper presents an original procedure for misfire detection in a high-performance 12-cylinder engine, based on the analysis of the time periods between subsequent combustions.A detailed analysis of the misfire effects on the engine crank-shaft instantaneous speed is presented, then a misfire detection procedure is designed, based on the misfire pattern recognition.The capability of this methodology was then validated under the worst case condition of a random misfire in several tests performed with the vehicle running on a circular race-track, at low and high load, in different gear, under acceleration and during a normal urban cycle.The results obtained are very interesting because the misfire pattern recognition works well even during cut-off or gear shifts, avoiding false alarm due to the strong influence that these phenomena have on crank-shaft dynamics.In conclusion same considerations have been done about the procedure capability of detecting more than one misfire within the same cycle.
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