US6029443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst with upstream cooling and downstream heating
Assignee: Toyota Motor Corp
•
Filing: 1997-05-21
•
Granted: 2000-02-29
•
Expires: 2017-05-21
Abstract
Abstract According to the present invention, there is provided an exhaust gas purification device for an engine having an exhaust passage, the device comprising a catalyst arranged in the exhaust passage and having an upstream end and a downstream end, a purification ratio of exhaust gas by the catalyst becoming more than a predetermined ratio when a temperature of the catalyst is within a predetermined temperature range, cooling means for cooling the upstream end of the catalyst, heating means for heating the downstream end of the catalyst, and control means for controlling the cooling means and the heating means to maintain the temperature of a portion of the catalyst, which portion is positioned between the upstream end and the downstream end, in the predetermined temperature range.
Inventors
- 👤 Shinya Hirota
- 👤 Toshiaki Tanaka
- 👤 Satoshi Iguchi
- 👤 Tatsuji Mizuno
- 👤 Kazuya Kibe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:29
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2046; F01N3/2013; F01N9/00; F01N2240/00; F01N2240/02; F01N2260/00; F01N2260/02; F01N2260/022; F01N2260/024; F01N2570/00; F01N2570/14; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
An exhaust gas purification device of an engine having an exhaust passage, said device comprising: a catalyst arranged in the exhaust passage and having an upstream end and a downstream end, a purification ratio of exhaust gas by said catalyst becoming more than a predetermined ratio when a temperature of said catalyst is within a predetermined temperature range, cooling means for cooling said upstream end of said catalyst, heating means for heating said downstream end of said catalyst, and control means for controlling said cooling means and said heating means to maintain the temperature of a portion of said catalyst, which portion is positioned between said upstream end and said downstream end, at said predetermined temperature range.
Claim 2
Dependent Claim
117 words
An exhaust gas purification device of an engine having an exhaust passage, said device comprising: a catalyst arranged in the exhaust passage and having an upstream end and a downstream end, a purification ratio of exhaust gas by said catalyst becoming more than a predetermined ratio when a temperature of said catalyst is within a predetermined temperature range, cooling means for cooling said upstream end of said catalyst, heating means for heating said downstream end of said catalyst, and control means for controlling said cooling means and said heating means to maintain the temperature of a portion of said catalyst, which portion is positioned between said upstream end and said downstream end, at said predetermined temperature range.
Claim 3
Dependent Claim
31 words
An exhaust gas purification device of an engine according to claim 1, wherein said cooling means comprises a liquid supply device for supplying liquid to said upstream end of said catalyst.
Claim 4
Dependent Claim
29 words
An exhaust gas purification device of an engine according to claim 2, wherein said liquid supply device comprises a coolant passageway extending through said upstream end of said catalyst.
Claim 5
Dependent Claim
31 words
An exhaust gas purification device of an engine according to claim 2, wherein said liquid supply means comprises means for supplying a reducing agent to said upstream end of said catalyst.
Claim 6
Dependent Claim
28 words
An exhaust gas purification device of an engine according to claim 1, wherein said heating means comprises an electric heater arranged in said downstream end of said catalyst.
Claim 7
Dependent Claim
25 words
An exhaust gas purification device of an engine according to claim 1, wherein said heating means is constituted by said downstream end of said catalyst.
Claim 8
Dependent Claim
35 words
An exhaust gas purification device of an engine according to claim 6, wherein a cross sectional area of said downstream end of said catalyst is increased, as compared with said upstream end of said catalyst.
Claim 9
Dependent Claim
49 words
An exhaust gas purification device of an engine according to claim 6, wherein said catalyst includes catalytic metal therein for purifying the exhaust gas, and a density of said catalytic metal in said downstream end of said catalyst is increased, as compared with said upstream end of said catalyst.
Claim 10
Dependent Claim
58 words
An exhaust gas purification device of an engine according to claim 6, wherein said catalyst comprises a carrier and a layer formed on said carrier and including catalytic metal for purifying the exhaust gas, and a thickness of said layer in said upstream end of said catalyst is increased, as compared with said downstream end of said catalyst.
References Cited (Backward Citations)
US25858A
Cited
USRE25858E
Cited
US3768982A
Cited
US3733829A
Cited
DE2951621A1
Cited
JPS57188721A
Cited
JPS6245922A
Cited
JPS63283727A
Cited
US5033264A
Cited
JPH04175416A
Cited
US5229080A
Cited
US5234668A
Cited
US5538698A
Cited
JPH04265414A
Cited
JPH05133222A
Cited
US5465573A
Cited
US5533167A
Cited
JPH06205939A
Cited
US5599509A
Cited
DE4310926A1
Cited
US5474745A
Cited
US5417052A
Cited
US5460511A
Cited
US5685145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-02-28 | 2003-08-30 | 2004-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-28 | 2007-08-30 | 2008-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-28 | 2011-08-30 | 2012-02-29 | $7700.00 | Window Closed / Lapsed |