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Detection of Higher Frequency Vibration to improve Knock Controllability
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English
Abstract
For a Knock Control System (KCS) with a vibration sensor mounted on the engine block, means of improving the ratio of knock signal to engine vibration noise are discussed. From analyses of cylinder pressure and engine block vibration spectrums, it is shown that noise is lower in the second knock resonance frequency.
The development of a resonance type knock sensor detecting this higher frequency is described. A new KCS utilizing this sensor is evaluated and found to improve knock controllability, especially in engines with a high compression ratio or supercharging.
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Nakamura, N., Ohno, E., Kanamaru, M., and Funayama, T., "Detection of Higher Frequency Vibration to improve Knock Controllability," SAE Technical Paper 871912, 1987, https://doi.org/10.4271/871912.Also In
SAE 1987 Transactions Alternative Engines and Engine Components and Systems
Number: V96-5; Published: 1988-09-01
Number: V96-5; Published: 1988-09-01
References
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- Rayleigh J. W. S. “The Theory of Sound,” 2 Dover New York 1945
- Yasuho T. Sawamoto K. Matsushita K. “Knock Control System with Pressure Transducer in Each Spark Plug Washer,” JSAE paper 861 May 1986