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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

Figures

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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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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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