US5018348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for detecting the condition of catalytic converters
Assignee: Daimler Benz AG
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Filing: 1989-11-28
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Granted: 1991-05-28
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Expires: 2009-11-28
Abstract
Abstract An internal combustion engine has a catalytic converter in its exhaust gas path. In the catalytic converter, two exhaust gas emission measuring probes are provided spatially separated from one another. The phase shift between the output signals of these two measuring probes is used as a measure of the aging of the catalytic converter.
Inventors
- 👤 Ferry Durschmidt
- 👤 Harmut Kolb
- 👤 Wolfgang Strauss
- 👤 Hartmut Weckenmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:32
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/008; F01N11/00; F01N11/007; G; G01; G01N; G01N31/00; G01N31/10; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0031; F01N2550/00; F01N2550/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
A method for detecting the operational condition of a catalytic converter having a volume in an exhaust gas path of an internal combustion engine comprising the steps of: arranging an upstream gas emission probe and a downstream exhaust gas emission probe in the exhaust gas path on either side of an intermediately located portion of the volume of the catalytic converter; detecting a phase shift between output signals of the upstream and downstream gas emission probes; and evaluating the phase shift between the output signals as a measure of a state of aging of the catalytic converter.
Claim 2
Independent Claim
97 words
A method for detecting the operational condition of a catalytic converter having a volume in an exhaust gas path of an internal combustion engine comprising the steps of: arranging an upstream gas emission probe and a downstream exhaust gas emission probe in the exhaust gas path on either side of an intermediately located portion of the volume of the catalytic converter; detecting a phase shift between output signals of the upstream and downstream gas emission probes; and evaluating the phase shift between the output signals as a measure of a state of aging of the catalytic converter.
Claim 3
Dependent Claim
41 words
A method according to claim 1, further comprising the steps of: controlling a fuel/air mixture supplied to the internal combustion engine to a stoichiometric value; and modifying the control step in accordance with the state of aging of the catalytic coverter.
Claim 4
Independent Claim
96 words
A device for detecting the operational condition of a catalytic converter having a volume in an exhaust gas path of an internal combustion engine comprising: an upstream gas emission probe and a downstream exhaust gas emission probe in the exhaust gas path on either side of an intermediately located portion of the volume of the catalytic converter; detecting means for detecting a phase shift between output signals of the upstream and downstream probes; and evaluating means for evaluating the phase shift between the signals as a measure of a state of aging of the catalytic converter.
Claim 5
Independent Claim
96 words
A device for detecting the operational condition of a catalytic converter having a volume in an exhaust gas path of an internal combustion engine comprising: an upstream gas emission probe and a downstream exhaust gas emission probe in the exhaust gas path on either side of an intermediately located portion of the volume of the catalytic converter; detecting means for detecting a phase shift between output signals of the upstream and downstream probes; and evaluating means for evaluating the phase shift between the signals as a measure of a state of aging of the catalytic converter.
Claim 6
Dependent Claim
26 words
A device according to claim 3, wherein the intermediately located portion of the volume of the catalytic converter is about 10% to 30% of the volume.
Claim 7
Dependent Claim
28 words
A device according to claim 4, wherein the intermediately located portion of the volume of the catalytic converter is located at an upstream end of the catalytic converter.
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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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |