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In-Cylinder Pressure Estimation from Structure-Borne Sound
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 06, 2000 by SAE International in United States
Annotation ability available
Event: SAE 2000 World Congress
We propose a novel method to real-time in-cylinder pressure estimation by processing structure-borne sound measurements. It has been shown that knowledge of the in-cylinder pressure opens the door to robust misfire detection and sophisticated closed loop engine control schemes. However, the costs of such sensors have inhibited their use in production engines. On the other hand, acceleration sensors are of low cost and already mounted on modern production engines for knock detection. Since structure-borne sound is measured on the surface of the engine, all cylinders are simultaneously observed by one sensor. A simple physically based model, describing the speed dependence of the transfer behavior from each in-cylinder pressure to structure-borne sound is developed. Based on this model, a method for identifying the parameterized transfer function speed independently is developed. Once this algorithm was applied, pressure signal approximations can be extracted from structure-borne sound signals. Since the identification was performed speed independently, only one set of system parameters is needed. Experiments based on real measurement data show the capability of the proposed methods.
CitationWagner, M., Böhme, J., and Förster, J., "In-Cylinder Pressure Estimation from Structure-Borne Sound," SAE Technical Paper 2000-01-0930, 2000, https://doi.org/10.4271/2000-01-0930.
- Azzoni, P. Reconstruction of Indicated Pressure Waveform in a Spark-Ignition Engine From Block Vibration Measurements Journal of Dynamic Systems, Measurement, and Control 119 1997 December 614 619
- Biermann, G.J. Factorization Methods for Discrete Sequential Estimation Academic Press New York 1977
- Dennis, J.E. Schnabel, R.B. Numerical Methods for Unconstrained Optimization and Nonlinear Equations Prentice Hall Englewood Cliffs 1983
- Ljung, L. Söderström, T. Theory and Practice of Recursive Identification MIT-Press Cambridge, MA 1983
- Lyon R.H. Machinery Noise and Diagnostics Butterworth, Boston 1987
- Mahr, B. Essers, U. Welte, L. New Method for the Determination of the Indicated Combustion Chamber Pressure Motortechnische Zeitschrift 55 1994
- Pestena, G.W. Engine Control Methods Using Combustion Pressure Feedback SAE paper 890758
- Powell, J.D. Engine Control Using Cylinder Pressure: Past, Present, and Future Journal of Dynamic Systems, Measurement, and Control 115 1993 June 343 359
- Wibberley P. Clark, C.A. An Investigation of Cylinder Pressure as Feedback for Control of Internal Combustion Engines SAE paper 890396
- Robert Bosch GmbH Stuttgart, Germany Wagner, M. Böhme, J.F. Förster, J. Raichle, F. September 1998