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Estimating the Air/Fuel Ratio from Gaussian Parameterizations of the Ionization Currents in Internal Combustion SI Engines
Technical Paper
2000-01-1245
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
SAE 2000 World Congress
Language:
English
Abstract
In this paper we use the idea of parameterizing the ionization current using the sum of two Gaussian functions in an indirect scheme to estimate the AFR.
In the first step of the scheme, the Gaussian functions are fitted to the ion signal using a standard least-squares fit. Then, as a second step, the AFR is estimated using the six parameters of the Gaussian functions plus the ignition angle and measurements of the engine speed.
The experimental tests show that it is possible to estimate the AFR with good accuracy, using this approach. The best results were obtained using a neural network approach and it is shown in the paper that the AFR can be estimated from the ionization current down to approximately 0.1% in mean square error.
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Authors
Citation
Klövmark, H., Rask, P., and Forssell, U., "Estimating the Air/Fuel Ratio from Gaussian Parameterizations of the Ionization Currents in Internal Combustion SI Engines," SAE Technical Paper 2000-01-1245, 2000, https://doi.org/10.4271/2000-01-1245.Also In
Electronic Engine Controls 2000: Modeling, Neural Networks, Obd, and Sensors
Number: SP-1501; Published: 2000-03-06
Number: SP-1501; Published: 2000-03-06
References
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- Hellring M. Munther T. Rögnvaldsson T. Wickström N. Carlsson C. Larsson M. Nytomt J. “Robust AFR Estimation Using the Ion Current and Neural Networks” SAE Technical Paper 1999-01-1161
- Eriksson L. Nielsen L. “Ionization Current Interpretation for Ignition Control in Internal Combustion Engines” IFAC Control Engineering Practice 8 5 August 1997
- Eriksson L. Nielsen L. “Ignition Control by Ionization Current Interpretation” SAE Technical Paper 960045
- Heywood J. B. “Internal Combustion Engine Fundamentals” McGraw-Hill 1988 ISBN 0-07-100499-8
- Reinmann R. Linna J-R. Målberg H. “Bulk Gas Composition and Fuel Influence on Ion Current Signals Measured in an SI Engine” 6 th Aachen Colloquium, Automobile and engine technology October 20-22 1997
- Saitzkoff A. Reinmann R. Berglind T. Glavmo M. “An Ionization Equilibrium Analysis of the Spark Plug as an Ionization Sensor” SAE Technical Paper 960337