US6408833B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Venturi bypass exhaust gas recirculation system
Assignee: Caterpillar Inc
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Filing: 2000-12-07
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Granted: 2002-06-25
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Expires: 2020-12-07
Abstract
Abstract An internal combustion engine is provided with a combustion air supply, an intake manifold, an exhaust manifold, and an exhaust gas recirculation system having a venturi assembly. The venturi assembly includes an outlet, a combustion air inlet connected and in communication with the combustion air supply, and an exhaust gas inlet connected and in communication with the exhaust manifold. A bypass fluid line and a bypass valve in the nature of a check valve are provided to bypass the venturi assembly. The check valve is responsive to changes in pressure drop across the venturi assembly, to open and close the bypass fluid line and limit the pressure drop across the venturi assembly.
Inventors
- 👤 James J. Faletti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:20
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/13; F02M26/42; F02M26/43; F02M26/38; F02M26/44; F02M26/02; F02M26/04; F02M26/05; F02M26/09; F02M26/10; F02M26/17; F02M26/19; F02M26/22; F02M26/23; F02M26/25
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
108 words
An internal combustion engine, comprising: a combustion air supply; an exhaust manifold; an intake manifold; a venturi assembly including an outlet connected and in communication with said intake manifold, a combustion air inlet connected and in communication with said combustion air supply, and an exhaust gas inlet connected and in communication with said exhaust manifold; a bypass fluid line connected and in communication with,said combustion air supply, and connected and in communication with said intake manifold and bypassing said venturi assembly; and a bypass valve, controlling flow through said bypass fluid line, said bypass control valve being responsive to pressure differential on opposite sides of said venturi assembly.
Claim 2
Dependent Claim
108 words
An internal combustion engine, comprising: a combustion air supply; an exhaust manifold; an intake manifold; a venturi assembly including an outlet connected and in communication with said intake manifold, a combustion air inlet connected and in communication with said combustion air supply, and an exhaust gas inlet connected and in communication with said exhaust manifold; a bypass fluid line connected and in communication with,said combustion air supply, and connected and in communication with said intake manifold and bypassing said venturi assembly; and a bypass valve, controlling flow through said bypass fluid line, said bypass control valve being responsive to pressure differential on opposite sides of said venturi assembly.
Claim 3
Dependent Claim
17 words
The internal combustion engine of claim 1 , said bypass valve being a spring loaded check valve.
Claim 4
Dependent Claim
26 words
The internal combustion engine of claim 2 , said spring loaded check valve arranged to open in response to increased pressure drop across said venturi assembly.
Claim 5
Dependent Claim
17 words
The internal combustion engine of claim 3 , said combustion air supply including an exhaust gas turbocharger.
Claim 6
Dependent Claim
17 words
The internal combustion engine of claim 1 , said combustion air supply including an exhaust gas turbocharger.
Claim 7
Dependent Claim
47 words
The internal combustion engine of claim 1 , said combustion air supply including a turbocharger having a turbine in communication with and operated by exhaust gas flow from said exhaust manifold and a compressor operated by said turbine, said compressor providing combustion air to said intake manifold.
Claim 8
Dependent Claim
36 words
The internal combustion engine of claim 6 , including a fluid line from said compressor to said venturi assembly, and said bypass fluid line connected to and in communication with said fluid line from said compressor.
Claim 9
Dependent Claim
36 words
The internal combustion engine of claim 7 , including a combustion fluid line from said venturi assembly to said intake manifold, and said bypass fluid line connected to and in communication with said combustion fluid line.
Claim 10
Dependent Claim
18 words
The internal combustion engine of claim 8 , including an aftercooler in said fluid line from said compressor.
Claim 11
Dependent Claim
36 words
The internal combustion engine of claim 1 , including a combustion fluid line from said venturi assembly to said intake manifold, and said bypass fluid line connected to and in communication with said combustion fluid line.
Claim 12
Dependent Claim
67 words
A venturi bypass system for recirculating exhaust gas in an internal combustion engine, comprising: a venturi assembly having an outlet, a combustion air inlet and an exhaust gas inlet; a bypass fluid line conducting combustion air around said venturi assembly; and a bypass valve positioned in said bypass fluid line to open and close said bypass fluid line in response to pressure drop across said venturi assembly.
Claim 13
Dependent Claim
67 words
A venturi bypass system for recirculating exhaust gas in an internal combustion engine, comprising: a venturi assembly having an outlet, a combustion air inlet and an exhaust gas inlet; a bypass fluid line conducting combustion air around said venturi assembly; and a bypass valve positioned in said bypass fluid line to open and close said bypass fluid line in response to pressure drop across said venturi assembly.
Claim 14
Dependent Claim
17 words
The venturi bypass system of claim 11 , said bypass valve being a spring loaded check valve.
Claim 15
Dependent Claim
64 words
The venturi bypass system of claim 11 , including a combustion air supply, a fluid line connected to and in flow communication with said combustion air inlet and said combustion air supply, a combustion fluid line connected to and in communication with said outlet, and said bypass fluid line connected to and in flow communication with said fluid line and said combustion fluid line.
Claim 16
Dependent Claim
17 words
The venturi bypass system of claim 13 , said bypass valve being a spring loaded check valve.
Claim 17
Dependent Claim
20 words
The venturi bypass system of claim 14 , said check valve being responsive to differential pressure on opposite sides thereof.
Claim 18
Independent Claim
94 words
A method of recirculating exhaust gas in an internal combustion engine, comprising the steps of: providing an exhaust gas recirculation system including a venturi assembly having a combustion air inlet, an exhaust gas inlet and an outlet; transporting combustion air to said combustion air inlet; transporting exhaust gas to said exhaust gas inlet; providing a bypass fluid line for transporting combustion air around said venturi assembly; and selectively controlling flow through said bypass fluid line in response to pressure drop across said venturi assembly, and thereby controlling a pressure drop across said venturi assembly.
Claim 19
Independent Claim
94 words
A method of recirculating exhaust gas in an internal combustion engine, comprising the steps of: providing an exhaust gas recirculation system including a venturi assembly having a combustion air inlet, an exhaust gas inlet and an outlet; transporting combustion air to said combustion air inlet; transporting exhaust gas to said exhaust gas inlet; providing a bypass fluid line for transporting combustion air around said venturi assembly; and selectively controlling flow through said bypass fluid line in response to pressure drop across said venturi assembly, and thereby controlling a pressure drop across said venturi assembly.
Claim 20
Dependent Claim
21 words
The method of claim 16 , including selectively operating a bypass valve in response to pressure drop across said venturi assembly.
Claim 21
Dependent Claim
32 words
The method of claim 17 , including operating said bypass valve to open and close said bypass fluid line in response to the differential pressure on opposite sides of said bypass valve.
Claim 22
Dependent Claim
44 words
The method of claim 17 , including providing a spring operated check valve in said bypass fluid line, and operating said check valve to open and close said bypass fluid line in response to the differential pressure on opposite sides of said check valve.
Claim 23
Dependent Claim
34 words
The method of claim 16 , including providing a spring loaded check valve in said bypass fluid line, and operating said spring loaded check valve in response to pressure drop across said venturi assembly.
References Cited (Backward Citations)
US3662722A
Cited
US3866586A
Cited
US4005579A
Cited
US4048968A
Cited
US4026256A
Cited
US4137879A
Cited
US4147143A
Cited
US4150648A
Cited
US4290403A
Cited
US4270508A
Cited
US4478199A
Cited
US4956973A
Cited
US4614184A
Cited
US4630589A
Cited
US5163295A
Cited
US5322043A
Cited
US5379744A
Cited
US5611203A
Cited
US6062027A
Cited
US6205785B1
Cited
US6324847B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-06-24 | 2005-12-24 | 2006-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-06-24 | 2009-12-24 | 2010-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-06-24 | 2013-12-24 | 2014-06-25 | $7700.00 | Window Closed / Lapsed |