This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Dielectric Cell Technique for the Continuous Measurement of Fuel/Air Ratio under Transient Conditions of Engine Operation
Annotation ability available
Sector:
Language:
English
Abstract
A technique, based on the unique relationship that exists between the dielectric constant of a fully oxidized exhaust gas sample and the fuel:air ratio of the unburnt mixture, is presented. To measure the dielectric constant a special cell has been constructed through which the fully oxidized gases are passed. The capacitance of the cell is then directly proportional to the dielectric constant of the gases so that changes in mixture strength are detected as changes in cell capacitance. These changes in cell capacitance are measured electronically and are continuously recorded as an analogue voltage on a chart recorder. The cell design is such that the residence time of the gases is 1/10 s at a flow rate of 2 1/min-1.
Topic
Citation
Mills, W. and Harrow, G., "A Dielectric Cell Technique for the Continuous Measurement of Fuel/Air Ratio under Transient Conditions of Engine Operation," SAE Technical Paper 710162, 1971, https://doi.org/10.4271/710162.Also In
References
- Cornelius W. Caplan J. D. “Improved System For Control and Measurement of Air Consumption in a Single Cylinder Engine.” SAE Quarterly Transactions 6 4 1952
- Dilworth J. L. “Characteristics of Exhaust Gas Analysers.” SAE Journal 48 6 1941 234 239
- Yu T. C. “Fuel Distribution Studies-A New Look At An Old Problem.” SAE Transactions 71 1963 paper 603B
- D'Alleva B. A. Lovell W. G. “Relation of Exhaust Gas Composition To Air/Fuel Ratio.” SAE Transactions 38 1936 90 98
- Leonard L. S. “Fuel Distribution by Exhaust Gas Analysis.” Paper #379A SAE Fuels and Lubricants Meeting St. Louis June 1961
- Gerrish H. C. Meem, T. J. Jr. “The Measurement of Fuel/Air Ratio by Analysis of the Ozidized Exhaust Gas.” NACA No. 757 1943
- Collins M. H. “Techniques for the Quantitative Characterization of The Air/Fuel Mixture in the Inlet Manifold Of A Gasoline Engine.” SAE Transactions 78 1969 paper 690515
- Landolt Börnstein 5th 1 571
- Handbook Of Chemistry and Physics 40th Chemical Rubber Publishing Co. 1958 2523
- International Critical Tables 6 74
- Stranathan J. D. “Dielectric Constant of Water Vapor.” Phys. Rev. 48 1935 538
- Birnbaum G. Chatterjee S. K. “The Dielectric Constant of Water Vapor In The Microwave Region.” Appl. Phys. 23 1952 220
- Jasinski W. Berry J. A. “Measurement of Refractive Indices of Air, Nitrogen, Oxygen, Carbon Dioxide and Water Vapour at 3,360 mc/s.” Proc. Instn. Elect. Engrs. III 101 1954 337 342
- “Table of Dielectric Constants and Electric Dipole Moments Of Substances In The Gaseous State.” National Bureau of Standards, Circular 537 1953
- Stuart H. A. “Relation Between The Temperature and Dielectric Constant of Gases and Vapours. I-Method and Results in Carbon Dioxide and Air.” Z. Phys. 47 1928 457 478
- Joachim H. Braunm̋hl V. “The Dependence of the Dielectric Constants of Certain Gases Upon Temperature.” Z. Phys. 28 1927 141 149
- Zahn C. T. “The Electric Moment of Carbon Dioxide, Ammonia and Sulphur Dioxide.” Phys. Rev. 27 1926 455 459
- Forro′ M. “Variation of Dielectric Constants of Some Gases With Temperature and Pressure.” Z. Phys. 47 1928 430 455
- Sänger R. Steiger O. Gächter K. “Effect of Temperature Upon The Molecular Polarization of Gases and Vapours.” Helv. Phys. Acta 5 220 210