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A Comparison Between the Combustion of Isooctane, Methanol, and Methane in Pulse Flame Combustors with Closed Loop A/F Control
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Abstract
CO/H2 (ratios i.e. water gas shift equilibria) in exhaust gases produced from the combustion of pure isooctane, methanol, and methane in a pulse flame combustor were measured. Measured CO/H2 ratios were directionally consistent with C/H ratios of the respective fuels. The average CO/H2 ratios in combusted isooctane, methanol, and methane were found to be 3.8, 1.25, and 2.0, respectively. The effect of these differences on feedback A/F control with a HEGO (heated exhaust gas oxygen) sensor were also examined. Feedback control of isooctane combustion produced operation very near to stoichiometry. On the other hand, the combustion of methanol under feedback control resulted in steady state lean operation while feedback control of methane combustion produced rich operation. For all three fuels, operation shifted in the lean direction as combustion efficiency was degraded. In addition, evidence is provided which indicates that the differences in control characteristics between isooctane, methanol, and methane are the result of H2 enriching and incomplete equilibration of CH4 at the HEGO sensor electrode.
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Hepburn, J., "A Comparison Between the Combustion of Isooctane, Methanol, and Methane in Pulse Flame Combustors with Closed Loop A/F Control," SAE Technical Paper 920799, 1992, https://doi.org/10.4271/920799.Also In
References
- Takeuchi, T. Saji, K. Igarashi, I. “Characteristics of a Zirconia Oxygen Sensor in Oxygen-Combustible Gas Mixtures” Electrochemical Society Extended Abstracts 19 74 1978
- Furusaki, K. “Oxygen Sensor for Methanol Fuel” NGK Spark Plug Technical Report No. F9008-163D August 13 1990
- Delichatsios, M. Keck, J. “Rate Controlled Constrained Equilibrium Calculations of CO and NO Freezing in Internal Combustion Engines” Amer. Chem. Soc. Div. Petroleum Chem. Symposium on Chemistry of Combustion in Engines Philadelphia, PA April 1975
- Saji, K. Kondo, H. Takeuchi, T. Igarashi, I. “EMF Characteristics of Zirconia Oxygen Sensor in Nonequilibrium Gas Mixtures Containing Combustible Gas and Oxygen” Proceedings of the 1 st Sensor Symposium 1 103 1981
- Gruber, H.U. Wiedenmann, H.M. “Three Years Field Experience with the Lamda-Sensor in Automotive Control Systems” SAE Paper 800017 1980
- Fleming, W.J. “Physical Principles Governing Nonideal Behavior of the Zirconia Oxygen Sensor” J. Electrochem. Soc. 124 21 1977
- “Analysis of the Economic and Environmental Effects of Compressed Natural Gas as an Automotive Fuel” Environmental Protection Agency Office of Mobile Sources Special Report November 21 1989
- Yao, Y.Y. “Oxidation of Alkanes over Noble Metal Catalysts” Ind. Eng. Chem. Prod. Res. Dev. 19 293 1980
- Kummer, J.T. “Fuel Economy and Emissions” Fuel Economy Plenum Publishing Corporation 1984 35
- Otto, K. “A Laboratory Method for the Simulation of Automobile Exhaust and Studies of Catalyst Poisoning” J. Air Pollution Control Association 24 596 1974
- Norimatsu, T. “Air-Fuel Control System” U.S. Patent 4,251,990 February 24 1991
- Kayanuma, C. “Double Air-Fuel Ratio Sensor System Having Improved Response Characteristics” U.S. Patent 4,693,076 September 15 1987
- Ober, R.F. Mooney, J.J. “Natural Gas Catalyst Presentation to Ford Motor Company” Engelhard Corporation Environmental Catalysts Group August 27 1991