US5325666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust system of an internal-combustion engine
Assignee: Dr Ing HCF Porsche AG
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Filing: 1991-07-10
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Granted: 1994-07-05
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Expires: 2011-07-10
Abstract
Abstract The exhaust gases of a two-bank internal-combustion engine are guided, by way of exhaust gas collectors, to a central expansion chamber of a housing. From there, they flow through main catalysts arranged on opposite ends of the housing, before they are guided into the open air by way of end mufflers. This exhaust system provides a space-saving arrangement of all components required for an optimal emission control, and low exhaust gas back pressure, and meets all acoustic requirements.
Inventors
- 👤 Erwin Rutschmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:20
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/04; F01N13/009; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2882; F01N3/2889; F01N5/00; F01N5/02; F01N13/08; F01N13/10; F01N13/107; F01N2250/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
79 words
An exhaust system of a multi-cylinder internal-combustion engine, the exhaust gases of which are guided by means of a collector approximately centrally to a housing which has catalysts at opposite ends, all exhaust gas being led out to the open air downstream of the catalysts, wherein the collector is provided with an end piece which projects into an expansion chamber which is centrally arranged in the housing, said end piece being provided with radial openings on its lateral surface.
Claim 2
Dependent Claim
79 words
An exhaust system of a multi-cylinder internal-combustion engine, the exhaust gases of which are guided by means of a collector approximately centrally to a housing which has catalysts at opposite ends, all exhaust gas being led out to the open air downstream of the catalysts, wherein the collector is provided with an end piece which projects into an expansion chamber which is centrally arranged in the housing, said end piece being provided with radial openings on its lateral surface.
Claim 3
Dependent Claim
56 words
A system according to claim 1, comprising cylinders combined in two banks and exhaust pipes leading from the cylinders to the collector, wherein a collector is assigned to each cylinder bank and leads by means of an end piece into the expansion cylinder, each said end piece being provided with radial openings on its lateral surface.
Claim 4
Dependent Claim
22 words
A system according to claim 1, wherein the housing extends transversely with respect to the longitudinal direction (F) of the internal-combustion engine.
Claim 5
Dependent Claim
26 words
A system according to claim 1, wherein the expansion chamber is cylindrically constructed, and wherein the end pieces lead perpendicularly into the cylindrically constructed expansion chamber.
Claim 6
Dependent Claim
15 words
A system according to claim 2, wherein the end pieces are closed at the end.
Claim 7
Dependent Claim
14 words
A system according to claim 2, wherein each exhaust gas collector has a catalyst.
Claim 8
Dependent Claim
27 words
A system according to claim 6, wherein each starting catalyst has a closable central duct and a ring duct which surrounds it and contains the catalyst material.
Claim 9
Dependent Claim
36 words
A system according to claim 1, wherein the housing is constructed in a double-walled manner as a heat exchanger provided with connection pieces which heats fresh air means of the thermal energy of the exhaust gases.
Claim 10
Dependent Claim
22 words
A system according to claim 2, wherein a wall bounding partial chambers is arranged in the expansion chamber between the end pieces.
Claim 11
Dependent Claim
17 words
A system according to claim 1, wherein lambda probes are arranged upstream of at least one catalyst.
Claim 12
Dependent Claim
43 words
A system according to claim 2, wherein the catalysts include at least one starting catalyst and at least one main catalyst, and wherein lambda probes are arranged upstream of each starting catalyst and downstream of each main catalyst and in the expansion chamber.
Claim 13
Dependent Claim
17 words
A system according to claim 2, wherein a separate starting catalyst is assigned to each exhaust pipe.
Claim 14
Dependent Claim
14 words
A system according to claim 4, wherein each exhaust gas collector has a catalyst.
Claim 15
Dependent Claim
14 words
A system according to claim 5, wherein each exhaust gas collector has a catalyst.
Claim 16
Dependent Claim
17 words
A system according to claim 4, wherein lambda probes are arranged upstream of at least one catalyst.
Claim 17
Dependent Claim
17 words
A system according to claim 6, wherein lambda probes are arranged upstream of at least one catalyst.
Claim 18
Dependent Claim
43 words
A system according to claim 4, wherein the catalysts include at least one starting catalyst and at least one main catalyst, and wherein lambda probes are arranged upstream of each starting catalyst and downstream of each main catalyst and in the expansion chamber.
Claim 19
Dependent Claim
24 words
A system according to claim 4, wherein the catalysts include starting catalysts, and wherein a separate starting catalyst is assigned to each exhaust pipe.
Claim 20
Dependent Claim
17 words
A system according to claim 1, wherein lambda probes are arranged downstream of at least one catalyst.
Claim 21
Dependent Claim
17 words
A system according to claim 4, wherein lambda probes are arranged downstream of at least one catalyst.
Claim 22
Dependent Claim
17 words
A system according to claim 6, wherein lambda probes are arranged downstream of at least one catalyst.
Claim 23
Dependent Claim
79 words
An exhaust system of a multi-cylinder internal-combustion engine, the exhaust gases of which are guided by means of a collector approximately centrally to a housing which has catalysts at opposite ends, all exhaust gas being led out to the open air downstream of the catalysts, wherein the collector is provided with an end piece which projects into an expansion chamber which is centrally arranged in the housing, and wherein lambda probes are arranged upstream of at least one catalyst.
Claim 24
Dependent Claim
79 words
An exhaust system of a multi-cylinder internal-combustion engine, the exhaust gases of which are guided by means of a collector approximately centrally to a housing which has catalysts at opposite ends, all exhaust gas being led out to the open air downstream of the catalysts, wherein the collector is provided with an end piece which projects into an expansion chamber which is centrally arranged in the housing, and wherein lambda probes are arranged upstream of at least one catalyst.
Claim 25
Dependent Claim
79 words
An exhaust system of a multi-cylinder internal-combustion engine, the exhaust gases of which are guided by means of a collector approximately centrally to a housing which has catalysts at opposite ends, all exhaust gas being led out to the open air downstream of the catalysts, wherein the collector is provided with an end piece which projects into an expansion chamber which is centrally arranged in the housing, and wherein lambda probes are arranged upstream of at least one catalyst.
Claim 26
Dependent Claim
79 words
An exhaust system of a multi-cylinder internal-combustion engine, the exhaust gases of which are guided by means of a collector approximately centrally to a housing which has catalysts at opposite ends, all exhaust gas being led out to the open air downstream of the catalysts, wherein the collector is provided with an end piece which projects into an expansion chamber which is centrally arranged in the housing, and wherein lambda probes are arranged upstream of at least one catalyst.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |