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US4485369A
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Sensor for measuring air-fuel ratio
Assignee: Niterra Co Ltd
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Filing: 1981-12-17
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Granted: 1984-11-27
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Expires: 2001-12-17
Abstract
Abstract A sensor for measuring air-fuel ratio, comprising a porous oxygen ion-conductive solid electrolyte sintered body having a pellet-like shape, and two heat-resistant metal wires embedded therein at a given interval, can measure accurately and easily the air-fuel ratio of a gas in a lean side, wherein the air-fuel ratio is not less than the theoretical air-fuel ratio. The solid electrolyte may be either zirconia or thoria containing as a stabilizer yttria, calcia or magnesia and having an apparent porosity of from about 5% to about 40%.
Inventors
- 👤 Yoshiro Ushida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:04
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
107 words
A sensor for measuring air-fuel ratio of a gas wherein the oxygen content in the gas is sensed through the measurement of the electrical resistance of the sensor, comprising a porous oxygen-ion-conductive solid electrolyte sintered body having a pellet-like shape formed from an oxygen ion-conductive solid electrolyte selected from the group consisting of ZrO 2 and ThO 2 and including a stabilizing material selected from the group consisting of Y 2 O 3 , CaO, and MgO, said body having an apparent porosity of from about 5% to about 40%, and two heat-resistant metal wires embedded therein at a given interval for measuring the electrical resistance thereof.
Claim 2
Dependent Claim
107 words
A sensor for measuring air-fuel ratio of a gas wherein the oxygen content in the gas is sensed through the measurement of the electrical resistance of the sensor, comprising a porous oxygen-ion-conductive solid electrolyte sintered body having a pellet-like shape formed from an oxygen ion-conductive solid electrolyte selected from the group consisting of ZrO 2 and ThO 2 and including a stabilizing material selected from the group consisting of Y 2 O 3 , CaO, and MgO, said body having an apparent porosity of from about 5% to about 40%, and two heat-resistant metal wires embedded therein at a given interval for measuring the electrical resistance thereof.
Claim 3
Dependent Claim
17 words
A sensor according to claim 1 wherein said sintered body has an apparent porosity of about 22%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |