A study on the oxygen-biased wide range air-fuel ratio sensor for rich and lean air-fuel ratios

Ohsuga, Minoru; Ohyama, Yoshishige

doi:10.1016/0250-6874(86)80061-0

Cited by 13 publications

(5 citation statements)

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“…Since Heyne proposed a new oxygen sensor using the electrochemical oxygen pump of a zirconia electrolyte (2), several modified types of gas sensors have been reported (1,(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). Gas polarographic oxygen (1,(8)(9)(10)(11)(12)(13)(14) and/or humid-it~ (15)(16)(17)(18) sensors using a zirconia electrolyte are one of them and have been investigated as a kind of amperometric type of gas sensor, whereas many types of the liquid-electrolyte gas sensors using the polarographic technique have been already reported (19)(20)(21).…”

Section: Discussionmentioning

confidence: 99%

“…The limiting current in the Knudsen diffusion region.-Since the oxygen diffusion through the gas diffusion hole is virtually independent of the pressure difference be- S o l v i n g Eq. [7] for t h e limiting current, IL(O2 --X)Kn, in t h e K n u d s e n diffusion region gives 4FDKnSP IL (02 --X) K n ---Xo2…”

Section: The Limiting Current In the Normal Diffusion Region-mentioning

confidence: 99%

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Gas Polarographic Oxygen Sensor Using an Oxygen/Zirconia Electrolyte

Usui

Asada

Nakazawa

et al. 1989

J. Electrochem. Soc.

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A new type of oxygen sensor using the electrochemical oxygen pump of a zirconia electrolyte and the artificial oxygen diffusion overpotential behavior has been investigated from the theoretical and practical viewpoints of the "gas polarography," the concept of which is proposed in this paper. This new oxygen sensor has excellent oxygen sensing characteristics analogous to polarography. As a result of the artificial oxygen diffusion overpotential at the cathode, the reproducible limiting current relating to the oxygen concentration was observed over a wide oxygen concentration range up to 95% and a temperature range of 400~176 in O2-inert gas mixtures. In this paper, the factors influencing the limiting current in the normal diffusion region, that is, the oxygen molar fraction, gaseous diffusion coefficients, the temperature, the pressure, and the two geometric quantities (area and length) of the gas diffusion hole are theoretically considered.

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Section: Discussionmentioning

confidence: 99%

Section: The Limiting Current In the Normal Diffusion Region-mentioning

confidence: 99%

Gas Polarographic Oxygen Sensor Using an Oxygen/Zirconia Electrolyte

Usui

Asada

Nakazawa

et al. 1989

J. Electrochem. Soc.

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“…44 8 have proposed a dynamic method where a sinusoidal current is applied to a pumping cell and the resulting pseudo-sinusoidal emf of a sensor cell is measured. The operation of these universal A/F sensors is not yet fully understood, though several studies are under way, 49 including the use of reversal of polarity of applied voltage to the solid oxide electrolyte, first to feed oxygen into the diffusion barrier and then to measure the oxygen in this layer. The location of a sensor in the exhaust manifold of a lean combustion engine 17 is shown in Fig.…”

Section: Vol 49 (3) May-june 1990mentioning

confidence: 99%

Oxygen Sensors for Automotive Applications

Subbarao¹

1990

Transactions of the Indian Ceramic Society

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Oxygen sensors are used to improve fuel efficiency and to control exhaust emissions in automobiles. The underlying principles, operation and design of two types of established oxygen sensors based on zirconia and titania are reviewed. Recent advances in sensor concepts to overcome the limitations of the zirconia and titania sensors are examined with special emphasis on sensors utilizing oxygen pumping and thin rum technology for operation at lean air/fuel ratios.

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“…At high temperatures (T > 973 K) nickel bearing steels sulfidize more rapidly than ferritic steels having the same chromium content (5). The effect of chromium on the sulfidation behavior of these steels is well known (1-4) but that of nickel is not so clearly defined.…”

Section: General Motors Assisted In Meeting the Publication Costs Of mentioning

confidence: 99%

“…The deposition of crystalline silicon or porous SiO2 is a potential method of preparing silicon-on-insulator (1). Porous films have also been used in both humidity (4) and oxygen (5)(6)(7) microsensors. Porous films have also been used in both humidity (4) and oxygen (5)(6)(7) microsensors.…”

mentioning

confidence: 99%

Porosity and Microstructure of Thin Films of Al2 O 3 Formed from an Alumina Sol

Mantese

Hamdi

Sturner

et al. 1989

J. Electrochem. Soc.

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Thin films of porous alumina were formed from an alumina sol which was cured at 500~ in either air or oxygen. We have determined, from a simple RBS marker experiment, that alumina films made from this sol have a volume porosity of about 50%, which is substantially different from bulk structures formed from this material. Ellipsometric measurements were also carried out to determine the porosity of these films. Our analysis shows an excellent agreement between the two measurements. No change in film porosity was found to occur after annealing at 900~ for 60 min in oxygen. ABSTRACTAn alloy containing 41 weight percent Ni was reacted at temperatures of 793, 888, and 938 K with flowing H2/H2S/N2 gas mixtures corresponding to equilibrium sulfur partial pressures in the range from 2 • 10 -5 to 6 • 10 -1 Pa. At 793 K the reaction product consisted of an inner compact layer of (Fe, Ni)I_=S plus pentlandite overgrown by layers of pentlandite and Ni-rich sulfide whiskers. Morphologies at the higher temperatures were similar except that pentlandite was absent. At all temperatures increases in the H2S partial pressure led to a more compact scale morphology. The scale phases are shown to be consistent with local equilibrium, although the scale-gas interface is not exactly at equilibrium because H2S dissociation is slow. Reaction kinetics were irregular at 793 K, due to scale-alloy separation, but parabolic at higher temperatures. Growth kinetics of the compact (Fe, Ni)I-xS layer were parabolic and are shown to be consistent with DFe/ DNi = 0.4 and highly nonideal defect levels.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-11 to IP

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A study on the oxygen-biased wide range air-fuel ratio sensor for rich and lean air-fuel ratios

Cited by 13 publications

References 1 publication

Gas Polarographic Oxygen Sensor Using an Oxygen/Zirconia Electrolyte

Gas Polarographic Oxygen Sensor Using an Oxygen/Zirconia Electrolyte

Oxygen Sensors for Automotive Applications

Porosity and Microstructure of Thin Films of Al2 O 3 Formed from an Alumina Sol

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