US5259189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for monitoring a catalytic converter
Assignee: ABB Asea Brown Boveri Ltd
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Filing: 1991-12-11
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Granted: 1993-11-09
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Expires: 2011-12-11
Abstract
Abstract A method for monitoring a catalytic converter for vehicles having Otto engines includes monitoring the composition of exhaust gases leaving a catalytic converter. An apparatus for monitoring the catalytic converter includes a sensor for hydrogen and/or carbon monoxide, and a sensor for oxygen.
Inventors
- 👤 Gunar Baier
- 👤 Bernd Schumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:56
CPC Classifications
G; G01; G01M; G01M13/00; F; F01; F01N; F01N11/00; F01N2550/00; F01N2550/02; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D2041/147; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
A method for monitoring a catalytic converter for a vehicle having an Otto engine, comprising the steps of monitoring by measuring sensors of the content of hydrogen and carbon monoxide in the exhaust gases leaving the catalytic converter; carrying out the monitoring of the catalytic converter only at a defined temperature of the measuring sensors and of the exhaust gases and then classifying the catalytic converter as defective if a threshold value is exceeded.
Claim 2
Independent Claim
74 words
A method for monitoring a catalytic converter for a vehicle having an Otto engine, comprising the steps of monitoring by measuring sensors of the content of hydrogen and carbon monoxide in the exhaust gases leaving the catalytic converter; carrying out the monitoring of the catalytic converter only at a defined temperature of the measuring sensors and of the exhaust gases and then classifying the catalytic converter as defective if a threshold value is exceeded.
Claim 3
Independent Claim
109 words
An apparatus for monitoring a catalytic converter for vehicles with a first sensor for detecting hydrogen and carbon monoxide disposed downstream of the catalytic converter, and a second sensor for detecting oxygen disposed upstream of the catalytic converter with respect to the flow direction of the exhaust gases, and including a catalytic converter monitoring device receiving the output signals supplied by said first and second sensors, and an engine control computer for regulating the fuel-air ration in the engine provided with an input receiving the output signal of said second sensor, and including a diagnostic computer connected to said engine control computer and to said catalytic converter monitoring device.
Claim 4
Independent Claim
109 words
An apparatus for monitoring a catalytic converter for vehicles with a first sensor for detecting hydrogen and carbon monoxide disposed downstream of the catalytic converter, and a second sensor for detecting oxygen disposed upstream of the catalytic converter with respect to the flow direction of the exhaust gases, and including a catalytic converter monitoring device receiving the output signals supplied by said first and second sensors, and an engine control computer for regulating the fuel-air ration in the engine provided with an input receiving the output signal of said second sensor, and including a diagnostic computer connected to said engine control computer and to said catalytic converter monitoring device.
Claim 5
Dependent Claim
28 words
The apparatus according to claim 2, wherein said first sensor is a ceramic solid electrolyte cell with electrocatalytically active electrodes disposed on the zirconium oxide solid electrolyte thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |