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TECHNICAL PAPERS: Internal Combustion Engines

Air Fuel Ratio Estimation Using In-Cylinder Pressure Frequency Analysis

[+] Author and Article Information
N. Cavina, F. Ponti

DIEM–University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy

J. Eng. Gas Turbines Power 125(3), 812-819 (Aug 15, 2003) (8 pages) doi:10.1115/1.1563242 History: Received February 01, 2001; Revised May 01, 2002; Online August 15, 2003
Copyright © 2003 by ASME
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References

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Fiorini, R. A., Gassenfeit, E. H., and Powell, J. D, 1988, “A/F Estimation From Internal Combustion Engine Cylinder Pressure Using Fast Fourier Transform Desciptors,” Proceedings of the American Control Conference, 88 , Pt. 1–3, June 15–17, Atlanta, GA, American Automatic Control Council, Green Valley, AZ.
Powell,  J. D., 1993, “Engine Control Using Cylinder Pressure: Past, Present and Future,” ASME J. Dyn. Syst., Meas., Control, 115, pp. 343–350.
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Figures

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Controlled air and fuel mass-flow rates variations to vary AFR values while maintaining T̄ic constant
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Pc harmonic components imaginary parts, for a group of operating conditions at the same engine speed, T̄ic and SA
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Investigated engine operating conditions
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Cylinder 1 pressure waveforms at T̄ic 30 Nm, 2000 rpm, 25 deg SA and different AFR values
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Net heat release waveforms for tests at T̄ic 30 Nm, 2000 rpm, 25 deg SA and different AFR values
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Pressure waveforms at T̄ic 50 Nm (corresponding to around T̄i 100 Nm for all four cylinders), 2000 rpm, 15 deg SA, and different AFR values
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Air and fuel mass-flow rates for the tests of Fig. 7
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Imaginary parts of the first two in-cylinder pressure frequency components
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F1 variation for the tests of Fig. 7
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F2 variation for the tests of Fig. 7
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F3 variation for the tests of Fig. 7
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AFR estimations versus corresponding AFR measurements

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