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US4362605A
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Sensor for measuring the oxygen content in the exhaust gas of combustion engines and method thereof
Assignee: Evonik Operations GmbH
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Filing: 1980-09-03
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Granted: 1982-12-07
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Expires: 2000-09-03
Abstract
Abstract An improved lambda sensor is disclosed for the measurement of the oxygen content in the exhaust gas of internal combustion engines in which the sensor element is provided with a gas permeable wrapping coated with a catalyst. The sensor delivers a clear well defined signal in the so-called rich exhaust gas, which makes possible a more precise adjustment of the fuel-air mixture fed to the internal combustion engine.
Inventors
- 👤 Alfred Bozon
- 👤 Edgar Koberstein
- 👤 Hans-Dieter Pletka
- 👤 Herbert Voelker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:37
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4077; F; F01; F01N; F01N11/00; F01N11/007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
In a sensor for the measurement of the oxygen content in the exhaust gas of internal combustion engines, wherein the solid substance electrolyte sensor element which serves as a producer of electrical sensor signals is fitted with a catalytically active gas permeable wrapping spaced apart from and not in contact with said sensor element, the improvement wherein the wrapping consists of at least one layer of wire gauze of an alloy containing iron, chromium and aluminum surrounding a perforated protection tube surrounding said sensor element, said wire gauze being coated with an intermediate layer of metal oxide promoting catalysis and said intermediate layer being impregnated with a metal of the platinum group or with a combination of at least one platinum group metal and at least one base metal.
Claim 2
Dependent Claim
129 words
In a sensor for the measurement of the oxygen content in the exhaust gas of internal combustion engines, wherein the solid substance electrolyte sensor element which serves as a producer of electrical sensor signals is fitted with a catalytically active gas permeable wrapping spaced apart from and not in contact with said sensor element, the improvement wherein the wrapping consists of at least one layer of wire gauze of an alloy containing iron, chromium and aluminum surrounding a perforated protection tube surrounding said sensor element, said wire gauze being coated with an intermediate layer of metal oxide promoting catalysis and said intermediate layer being impregnated with a metal of the platinum group or with a combination of at least one platinum group metal and at least one base metal.
Claim 3
Dependent Claim
18 words
The sensor as in claim 1 wherein a catalyst material is precipitated directly on the wire gauze wrapping.
Claim 4
Dependent Claim
24 words
The sensor as in claim 1 wherein an intermediate layer is present consisting of an aluminum oxide of the transition series which promotes catalysis.
Claim 5
Dependent Claim
17 words
The sensor as in claim 1, wherein a platinum/rhodium composition is used as the catalyst promoting material.
Claim 6
Dependent Claim
17 words
The sensor as in claim 1 wherein a platinum/rhoduium/aluminum composition is used as the catalyst promoting material.
Claim 7
Dependent Claim
74 words
A method for the production of a voltage corresponding to the residual oxygen concentration in the exhaust gases of internal combustion engines as a value for adjustment of the composition of the air/fuel ratio, comprising inserting into the exhaust line of an internal combustion engine, the probe as defined in claim 1, and thereby causing a voltage to be generated which imparts a signal to the controller of the fuel/air mixture for control thereof.
References Cited (Backward Citations)
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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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |