US5307628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust line allowing a faster triggering of the catalyst
Assignee: IFP Energies nouvelles
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Filing: 1992-06-18
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Granted: 1994-05-03
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Expires: 2012-06-18
Abstract
Abstract Device intended to improve the working of a catalyst (3) placed in the exhaust manifold of an internal-combustion engine, said exhaust manifold consisting of a tube (2) opening on one side into the collector (1) collecting the combustion gases coming from the cylinder(s) and covering with the other end thereof said catalyst (3). According to the invention, the device comprises: at least one pipe (8) inside said tube (2), having a first end (81) which opens in proximity to said catalyst (3), and a means (10) intended to selectively close the intertube volume (9) delimited between said inner pipe (8) and said tube (2) as a function of the temperature of the exhaust gases flowing onto said catalyst (3).
Inventors
- 👤 Michel Castagne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:33
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2053; F01N2290/00; F01N2470/00; F01N2470/24; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A device for improving the working of a catalyst placed in the exhaust manifold of an internal-combustion engine, said exhaust manifold comprising a tube connected to one side of a collector collecting the exhaust gases coming from the engine and opening at the other end thereof onto an inlet cone of said catalyst, said device comprising: an inner pipe located inside said tube, said inner pipe being arranged coaxially with said tube and having a restricted section with respect to said tube, a small thickness and a first end opening in proximity of said catalyst, and means for selectively closing an intertube space delimited between said inner pipe and said tube, as a function of the temperature of the exhaust gases led towards said catalyst so that the exhaust gases warm up a central portion of the catalyst when the selective closing means closes the intertube space.
Claim 2
Independent Claim
147 words
A device for improving the working of a catalyst placed in the exhaust manifold of an internal-combustion engine, said exhaust manifold comprising a tube connected to one side of a collector collecting the exhaust gases coming from the engine and opening at the other end thereof onto an inlet cone of said catalyst, said device comprising: an inner pipe located inside said tube, said inner pipe being arranged coaxially with said tube and having a restricted section with respect to said tube, a small thickness and a first end opening in proximity of said catalyst, and means for selectively closing an intertube space delimited between said inner pipe and said tube, as a function of the temperature of the exhaust gases led towards said catalyst so that the exhaust gases warm up a central portion of the catalyst when the selective closing means closes the intertube space.
Claim 3
Dependent Claim
21 words
A device as claimed in claim 1, wherein said selective closing means comprises an annular bimetallic strip fastened onto said tube.
Claim 4
Independent Claim
153 words
A device for improving the working of a catalyst placed in the exhaust manifold of an internal-combustion engine, said exhaust manifold comprising a tube connected comprising a tube connected to one side of a collector collecting the exhaust gases coming from the engine and opening at the other end thereof onto an inlet cone of said catalyst, said device comprising: an inner pipe located inside said tube, said inner pipe being arranged coaxially with said tube and having a restricted section with respect to said tube, a small thickness and a first end opening in proximity of said catalyst, and means for selectively closing an intertube space delimited between said inner pipe and said tube, as a function of the temperature of the exhaust gases led towards said catalyst, said selective closing means comprising an annular member whose section completely covers the inlet of said intertube space when the catalyst is not primed.
Claim 5
Independent Claim
153 words
A device for improving the working of a catalyst placed in the exhaust manifold of an internal-combustion engine, said exhaust manifold comprising a tube connected comprising a tube connected to one side of a collector collecting the exhaust gases coming from the engine and opening at the other end thereof onto an inlet cone of said catalyst, said device comprising: an inner pipe located inside said tube, said inner pipe being arranged coaxially with said tube and having a restricted section with respect to said tube, a small thickness and a first end opening in proximity of said catalyst, and means for selectively closing an intertube space delimited between said inner pipe and said tube, as a function of the temperature of the exhaust gases led towards said catalyst, said selective closing means comprising an annular member whose section completely covers the inlet of said intertube space when the catalyst is not primed.
Claim 6
Dependent Claim
57 words
A device as claimed in claim 3, wherein said annular member comprises two half rings and wherein each half ring may rotate around a substantially diametral axis so that each half ring may be led towards the central part of the inlet of the inner pipe when the intertube space must be permeable to the exhaust gases.
Claim 7
Dependent Claim
49 words
A device as claimed in claim 3, wherein said annular member comprises a collar which may slide axially between a first dog and a second dog, said dogs corresponding respectively to the closing of intertube space and to the opening of said space with respect to the exhaust gases.
Claim 8
Dependent Claim
47 words
A device as claimed in claim 1, wherein said selective closing means comprises a perforated tubular member arranged telescopically with respect to a part of the inner pipe, perforations in the tubular member and in the inner pipe co-operating so as to selectively close said intertube space.
Claim 9
Independent Claim
28 words
A device as claimed in any one of the previous claims, further comprising means for homogenizing the velocities of the exhaust gases at the inlet of said catalyst.
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) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-02 | 2001-11-01 | 2002-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-02 | 2005-11-01 | 2006-05-03 | $7700.00 | Window Closed / Lapsed |