US5072583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust system for internal combustion engines
Assignee: Nissan Motor Co Ltd
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Filing: 1990-02-08
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Granted: 1991-12-17
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Expires: 2010-02-08
Abstract
Abstract An exhaust system for internal combustion engines includes at least two exhaust passages, each passage communicated with at least one branch exhaust passage of an exhaust manifold communicating exhaust ports of a multiple-cylinder engine, and a confluent exhaust passage disposed downstream of said at least two exhaust passages, said confluent exhaust passage including a confluent point for converging downstream ends of said at least two exhaust passages. The exhaust system also includes a communication passage substantially parallel with the at least two exhaust passages and a valve disposed in the communication passage, for allowing a portion of exhaust gas flow to bypass said confluent point only when the engine is within a predetermined high engine revolution range.
Inventors
- 👤 Tomonori Urushihara
- 👤 Junichi Yokoyama
- 👤 Teruyuki Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:08
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N13/10; F01N13/107; F02; F02B; F02B27/00; F02B27/04; F02B27/06; F01N2240/00; F01N2240/36; F01N2470/00; F01N2470/30; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
An exhaust system for internal combustion engines comprising: at least two exhaust passages, each passage communicated with at least one branch exhaust passage of an exhaust manifold communicating exhaust ports of a multiple-cylinder engine; a confluent exhaust passage disposed downstream of said at least two exhaust passages, said confluent exhaust passage including a confluent point for converging downstream ends of said at least two exhaust passages; and means for bypassing a portion of exhaust gas flow through said confluent point only when the engine is within a predetermined high engine revolution range.
Claim 2
Dependent Claim
92 words
An exhaust system for internal combustion engines comprising: at least two exhaust passages, each passage communicated with at least one branch exhaust passage of an exhaust manifold communicating exhaust ports of a multiple-cylinder engine; a confluent exhaust passage disposed downstream of said at least two exhaust passages, said confluent exhaust passage including a confluent point for converging downstream ends of said at least two exhaust passages; and means for bypassing a portion of exhaust gas flow through said confluent point only when the engine is within a predetermined high engine revolution range.
Claim 3
Dependent Claim
70 words
The exhaust system as set forth in claim 1, wherein said bypassing means includes a communication passage for bypassing said confluent point and intercommunicating said at least two exhaust passages and said confluent exhaust passage, a valve for establishing and blocking the bypassed exhaust gas flow through said communication passage, and valve control means for opening said valve only when the engine is within said predetermined high engine speed range.
Claim 4
Dependent Claim
65 words
The exhaust system as set forth in claim 2, wherein said valve control means includes sensor means for monitoring an operating state of the engine, a control unit for determining the operating state of the engine on the basis of at least one signal from said sensor means, and an actuator for actuating said valve in response to a control signal from said control unit.
Claim 5
Dependent Claim
166 words
An exhaust system for internal combustion engines comprising: a dual exhaust tube section defining two exhaust passages, each passage communicated with at least two branch exhaust passages of an exhaust manifold communicating exhaust ports of a multiple-cylinder engine; a confluent exhaust passage disposed downstream of said two exhaust passages, said confluent exhaust passage including a confluent point for converging downstream ends of said two exhaust passages; a communication passage for bypassing said confluent point and intercommunicating said two exhaust passages and said confluent exhaust passage so as to bypass a portion of exhaust gas flow through said confluent point; a valve disposed in said communication passage, for establishing and blocking the bypassed exhaust gas flow through said communication passage; sensor means for monitoring an operating state of the engine; and valve control means for opening said valve only when said opening means determines on the basis of at least one signal from said sensor means that the engine is within a predetermined high engine speed range.
Claim 6
Dependent Claim
166 words
An exhaust system for internal combustion engines comprising: a dual exhaust tube section defining two exhaust passages, each passage communicated with at least two branch exhaust passages of an exhaust manifold communicating exhaust ports of a multiple-cylinder engine; a confluent exhaust passage disposed downstream of said two exhaust passages, said confluent exhaust passage including a confluent point for converging downstream ends of said two exhaust passages; a communication passage for bypassing said confluent point and intercommunicating said two exhaust passages and said confluent exhaust passage so as to bypass a portion of exhaust gas flow through said confluent point; a valve disposed in said communication passage, for establishing and blocking the bypassed exhaust gas flow through said communication passage; sensor means for monitoring an operating state of the engine; and valve control means for opening said valve only when said opening means determines on the basis of at least one signal from said sensor means that the engine is within a predetermined high engine speed range.
Claim 7
Dependent Claim
35 words
The exhaust system as set forth in claim 4, wherein said sensor means includes a sensor generating a signal representative of a throttle opening angle and/or a sensor generating a signal representative of engine speed.
Claim 8
Dependent Claim
145 words
An exhaust system for internal combustion engines comprising: at least two exhaust passages, each passage communicated with at least one branch exhaust passage of an exhaust manifold communicating exhaust ports of a multiple-cylinder engine; a confluent exhaust passage disposed downstream of said at least two exhaust passages, said confluent exhaust passage including a confluent point for converging downstream ends of said at least two exhaust passages; a pulse converter disposed in the vicinity of said confluent point for changing flow velocity and pressure of exhaust gas, said pulse converter being comprised of an ejector disposed adjacent to and upstream of said confluent point and a diffuser disposed adjacent to and downstream of said confluent point; and means for varying exhaust gas flow through said pulse converter such that the exhaust gas flow is decreased only when the engine is within a predetermined high speed range.
Claim 9
Dependent Claim
145 words
An exhaust system for internal combustion engines comprising: at least two exhaust passages, each passage communicated with at least one branch exhaust passage of an exhaust manifold communicating exhaust ports of a multiple-cylinder engine; a confluent exhaust passage disposed downstream of said at least two exhaust passages, said confluent exhaust passage including a confluent point for converging downstream ends of said at least two exhaust passages; a pulse converter disposed in the vicinity of said confluent point for changing flow velocity and pressure of exhaust gas, said pulse converter being comprised of an ejector disposed adjacent to and upstream of said confluent point and a diffuser disposed adjacent to and downstream of said confluent point; and means for varying exhaust gas flow through said pulse converter such that the exhaust gas flow is decreased only when the engine is within a predetermined high speed range.
Claim 10
Dependent Claim
124 words
The exhaust system as set forth in claim 6, wherein said varying means comprises: a communication passage substantially parallel with said at least two exhaust passages for intercommunicating said two exhaust passages and said confluent exhaust passage downstream of said pulse converter so as to bypass a portion of the exhaust gas flow through said pulse converter; a valve disposed in said communication passage, for establishing and blocking the bypassed exhaust gas flow through said communication passage; sensor means for monitoring an operating state of the engine; and valve control means for opening said valve only when said opening means determines on the basis of at least one signal from said sensor means that the engine is within the predetermined high engine speed range.
Claim 11
Dependent Claim
36 words
The exhaust system as set forth in claim 7, wherein said sensor means includes a sensor generating a signal representative of a throttle opening angle and/or a sensor generating a signal representative of an engine speed.
References Cited (Backward Citations)
US4953352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-16 | 1995-06-17 | 1995-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-16 | 1999-06-17 | 1999-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-16 | 2003-06-17 | 2003-12-17 | $7700.00 | Window Closed / Lapsed |