This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Reconstruction of Pressure Signals on Structure-borne Sound for Knock Investigation
Technical Paper
2004-01-0521
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Knocking combustions decrease the efficiency of an SI engine and can cause damages in combustion chambers. The in-cylinder pressure signal provides an insight into the combustions. Due to cost and installation reasons, vibration signals are used for knock analysis in conventional engines; however, vibration signal analysis is less effective than pressure signal analysis. The aim of this paper is to approximate the pressure signal, which is more suitable for knock investigation, from structure-borne sound. Therefore, new models for pressure and vibration signals, related to each other, are presented. These models consist of constructional specific signal components and combustion specific random parameters. The signal components need to be determined only once for an engine by using ordinary mathematical tools. A least-squares method, applied on vibration signals, leads to estimates of the random parameters. With the knowledge of the signal components and the estimates of the random parameters, the pressure signal can be reconstructed. Furthermore, the described methods are applied on measured data.
Recommended Content
Authors
Citation
Urlaub, M. and Böhme, J., "Reconstruction of Pressure Signals on Structure-borne Sound for Knock Investigation," SAE Technical Paper 2004-01-0521, 2004, https://doi.org/10.4271/2004-01-0521.Also In
References
- Stanković, L. Böhme, J. F. “Time-frequency analysis of multiple resonances in combustion engine signals” Signal Processing 79 1 15 28 Nov. 1999
- Cohen, L. “Time-Frequency Analysis” Prentice Hall 1995
- Carstens-Behrens, S. Urlaub, M. Böhme, J. F. Förster, J. Raichle, F. “FEM Approximation of Internal Combustion Chambers of Knock Investigation” SAE Paper 2002-01-0237 2002
- Bosch GmbH “Automotive Handbook” SAE 2001
- Boubal, O. “Knock Detection in Automobile Engines” IEEE Instrumentation and Measurement Magazine September 2000
- Boubal, O. Oksman, J. “Knock Acoustic Signal Estimation Using Parametric Inversion” IEEE Transactions on Instrumentation and Measurement Magazine 49 4 August 2000
- Draper, C. S. “Pressure Wave Accompanying Detonation in the Internal Combustion Engine” Journal of the Aeronautic Sciences 5 6 219 226 1938
- Hickling, R. Feldmaier, D. A. Chen, F. H. K. Morel, J. S. “Cavity resonances in Engine Combustion Chambers and Some Applications” J. Acoust. Soc. Am. 73 4 1170 1178 1983
- Chang, J. Kim, M. Min, K. “Detection of misfire and knock in spark ignition engines by wavelet transform of engine block vibration signals” Measurement Science and Technology 13 1108 1114 2002