Knock in S.I. Engines: A Comparison between Different Techniques for Detection and Control

Paper #:
  • 982477

Published:
  • 1998-10-19
Citation:
Millo, F. and Ferraro, C., "Knock in S.I. Engines: A Comparison between Different Techniques for Detection and Control," SAE Technical Paper 982477, 1998, https://doi.org/10.4271/982477.
Pages:
24
Abstract:
Several knock-detection methods, based both on cylinder pressure analysis and on engine block vibration analysis, have been carefully scrutinized through a critical review of the knock-detection techniques available in literature. Issues have been discussed regarding the physical meaning of knock intensity measurement indexes, mechanical noise sensitivity, transducer type and location, filtering-frequency bands and crank-angle window selection. An experimental investigation has been carried out on a typical European mass-produced engine, and this has provided criteria for the selection of the most suitable and reliable techniques, and has allowed a comparison between experimental results obtained by means of different knock-detection methods.
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