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EP0193379A2
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EP
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Air/fuel ratio sensor
Assignee: Niterra Co Ltd
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Filing: 1986-02-25
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Granted: —
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Expires: 2006-02-25
Abstract
Abstract An air/fuel ratio sensor is described, comprising an oxygen pump element (2) composed of a solid electrolyte (1) having a pair of electrodes (111,112) on opposite sides thereof. A gas diffusing section ( 4 ) is in contact with one electrode (112) on the oxygen pump element and which accepts a limited inflow of a gas to be analyzed. An oxygen gas detecting element (3), based on a transition metal oxide, is disposed within the gas diffusing section (4), the resistance of which varies in proportion to the partial pressure of oxygen in the gas to be analyzed.
Inventors
- 👤 Tetsusyo Yamada
- 👤 Nobuhiro Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 18:40
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/417
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
An air/fuel ratio sensor comprising an oxygen pump element (2) composed of a solid electrolyte (1) having a pair of electrodes (111,112) on opposite sides thereof, a gas diffusing section (4) that is in contact with one electrode (112) on the oxygen pump element and which accepts a limited inflow of a gas to be analyzed, and an oxygen gas detecting element (3), based on a transition metal oxide, disposed within the gas diffusing section (4) and the resistance of which varies in proportion to the partial pressure of oxygen in the gas to be analyzed.
Claim 2
Dependent Claim
96 words
An air/fuel ratio sensor comprising an oxygen pump element (2) composed of a solid electrolyte (1) having a pair of electrodes (111,112) on opposite sides thereof, a gas diffusing section (4) that is in contact with one electrode (112) on the oxygen pump element and which accepts a limited inflow of a gas to be analyzed, and an oxygen gas detecting element (3), based on a transition metal oxide, disposed within the gas diffusing section (4) and the resistance of which varies in proportion to the partial pressure of oxygen in the gas to be analyzed.
Claim 3
Dependent Claim
43 words
An air/fuel ratio sensor according to claim 1, wherein the transition metal oxide is at least one member selected from the group consisting of SnO 2 , Ti0 2 , CoO, ZnO, Nb 2 O 5 , and Cr 2 O 3 .
Claim 4
Dependent Claim
32 words
An air/fuel ratio sensor according to claim 1 or claim 2, wherein the gas diffusing section is in the form of a small gap through which the gas to be analyzed diffuses.
Claim 5
Dependent Claim
22 words
An air/fuel ratio sensor according to claim 1 or claim 2, wherein the gas diffusing section is formed of a porous member.
Claim 6
Dependent Claim
47 words
An air/fuel ratio sensor according to any of claims 1 to 4, wherein the electrode (11 1 ) on the side of the oxygen pump element (2) which is not in contact with the gas diffusing section (4) is in contact with the gas to be analyzed.
References Cited (Backward Citations)
No citation records indexed.
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