Detection of Spark Knock Oscillations: Dependence on Combustion Temperature

Paper #:
  • 970038

Published:
  • 1997-02-24
Citation:
Scholl, D., Russ, S., and Stockhausen, W., "Detection of Spark Knock Oscillations: Dependence on Combustion Temperature," SAE Technical Paper 970038, 1997, https://doi.org/10.4271/970038.
Pages:
8
Abstract:
The frequency of the pressure oscillations caused by spark knock depends on the temperature-dependent speed of sound in the combustion gases. Engine dynamometer tests showed a 6.5% (390 Hz) reduction in the knock fundamental frequency as the air/fuel ratio was swept from 13:1 to 20:1. Engine cycle simulation model predictions of maximum burned gas temperatures correlate well with the data. A robust knock detection system must be insensitive to the range of burned gas temperature (frequency of pressure oscillations) that will be encountered with a particular engine control system operating under the expected range of fuels and environmental conditions.
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