Detection of Spark Knock Oscillations: Dependence on Combustion Temperature 970038
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.
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. Download Citation
Author(s):
David Scholl, Stephen Russ, William Stockhausen
Affiliated:
Ford Motor Co.
Pages: 8
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Spark-Ignition Engine Combustion and Emissions-SP-1267
Related Topics:
Knock
Engine control systems
Combustion and combustion processes
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