US5752382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for determining an abnormal degree of deterioration of a catalyst
Assignee: Toyota Motor Corp
•
Filing: 1996-07-24
•
Granted: 1998-05-19
•
Expires: 2016-07-24
Abstract
Abstract A device for determining an abnormal degree of deterioration of catalyst of a catalytic converter, arranged in an internal combustion engine exhaust system, is disclosed. The device comprises a temperature sensor for measuring a temperature of the catalyst and an electronic control unit which assumes a temperature of the catalyst on the basis of the engine operating condition and calculates a ratio of a varying value of the measured temperature by the temperature sensor to a varying value of the assumed temperature and determines that the degree of deterioration of the catalyst is abnormal when the ratio is smaller than a predetermined value.
Inventors
- 👤 Toru Hanafusa
- 👤 Michihiro Ohasi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:19
CPC Classifications
F; F01; F01N; F01N9/00; F01N9/005; F01N11/00; F01N11/002; F01N11/005; F01N2550/00; F01N2550/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A device for determining the abnormal degree of deterioration of catalyst of a catalytic converter arranged in an internal combustion engine exhaust system, comprising: measuring means for measuring a temperature of said catalyst; assuming means for assuming a temperature of said catalyst on the basis of the engine operating condition; calculating means for calculating a ratio of a varying value of the measured temperature by said measuring means to a varying value of the assumed temperature by said assuming means; and determining means for determining that the degree of deterioration of said catalyst is abnormal when said ratio is smaller than a predetermined value.
Claim 2
Independent Claim
104 words
A device for determining the abnormal degree of deterioration of catalyst of a catalytic converter arranged in an internal combustion engine exhaust system, comprising: measuring means for measuring a temperature of said catalyst; assuming means for assuming a temperature of said catalyst on the basis of the engine operating condition; calculating means for calculating a ratio of a varying value of the measured temperature by said measuring means to a varying value of the assumed temperature by said assuming means; and determining means for determining that the degree of deterioration of said catalyst is abnormal when said ratio is smaller than a predetermined value.
Claim 3
Dependent Claim
42 words
A device according to claim 1, wherein said determining means determines the abnormal degree of deterioration of said catalyst only when said assumed temperature is within a temperature range of said catalyst in the initial stage of the purification of said catalyst.
Claim 4
Dependent Claim
50 words
A device according to claim 1, wherein said measuring means measures a temperature of said catalyst on the center portion of the downstream side of said catalytic converter, and said assuming means assumes a temperature of said catalyst on the center portion of the downstream side of said catalytic converter.
References Cited (Backward Citations)
US5060473A
Cited
US5177463A
Cited
JPH0460106A
Cited
US5355671A
Cited
WO1993020340A2
Cited
US5610844A
Cited
JPH0771233A
Cited
US5435172A
Cited
US5560200A
Cited
US5626014A
Cited
US5630315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-18 | 2001-11-17 | 2002-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-18 | 2005-11-17 | 2006-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-18 | 2009-11-17 | 2010-05-19 | $7700.00 | Window Closed / Lapsed |