US6609374B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bypass venturi assembly for an exhaust gas recirculation system
Assignee: Caterpillar Inc
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Filing: 2001-12-20
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Granted: 2003-08-26
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Expires: 2021-12-20
Abstract
Abstract An internal combustion engine, particularly suitable for use in a motor vehicle, is provided with a combustion air supply, an exhaust manifold, and a bypass venturi assembly. The bypass venturi assembly includes a housing having 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 venturi nozzle is positioned in communication with the combustion air inlet. The venturi nozzle defines a bypass venturi section therein. The venturi nozzle and the housing define an exhaust gas venturi section therebetween terminating at an induction area. The venturi nozzle has a plurality of through holes in communication with a downstream portion of the exhaust gas venturi section. The exhaust gas inlet terminates at the induction area. A bypass valve is positioned to open and close the bypass venturi section. The bypass venturi assembly has a compact design with simple and efficient operation for selectively controlling the amount of exhaust gas which is inducted into the compressed combustion air.
Inventors
- 👤 Dennis D. Feucht
- 👤 Paul F. Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:49
CPC Classifications
F; F02; F02D; F02D9/00; F02D9/08; F02D9/10; F02D9/1035; F02D9/104; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/05; F02M26/09; F02M26/10; F02M26/13; F02M26/17; F02M26/19; F02M26/52; F02M26/53; F02M26/54; F02M35/00; F02M35/10; F02M35/10091; F02M35/10118; F02M35/10209; F02M35/10222; F02M35/10242; F02M35/10268; F02M35/104; F02M35/112; F02B; F02B37/00; F02D9/02; F02D2009/0201; F02D2009/0276; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87587
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
129 words
An internal combustion engine, comprising: a combustion air supply; an exhaust manifold; a bypass venturi assembly including a housing having an outlet, 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, and a venturi nozzle in communication with said combustion air inlet, said venturi nozzle defining a bypass venturi section therein, said venturi nozzle and said housing defining an exhaust gas venturi section therebetween terminating at an induction area, said venturi nozzle having a plurality of through holes in communication with a downstream portion of said exhaust gas venturi section, said exhaust gas inlet terminating at said induction area, and a bypass valve positioned to open and close said bypass venturi section.
Claim 2
Dependent Claim
129 words
An internal combustion engine, comprising: a combustion air supply; an exhaust manifold; a bypass venturi assembly including a housing having an outlet, 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, and a venturi nozzle in communication with said combustion air inlet, said venturi nozzle defining a bypass venturi section therein, said venturi nozzle and said housing defining an exhaust gas venturi section therebetween terminating at an induction area, said venturi nozzle having a plurality of through holes in communication with a downstream portion of said exhaust gas venturi section, said exhaust gas inlet terminating at said induction area, and a bypass valve positioned to open and close said bypass venturi section.
Claim 3
Dependent Claim
29 words
The internal combustion engine of claim 1 , including an annular receiver section between said venturi nozzle and said housing immediately downstream from and adjacent to said induction area.
Claim 4
Dependent Claim
18 words
The internal combustion engine of claim 2 , said annular receiver section having a substantially constant cross-sectional area.
Claim 5
Dependent Claim
49 words
The internal combustion engine of claim 2 , including a pressure recovery section between said venturi nozzle and said housing immediately downstream from and adjacent to said annular receiver section, said pressure recovery section having an increasing cross-sectional area in a direction extending away from said annular receiver section.
Claim 6
Dependent Claim
28 words
The internal combustion engine of claim 4 , including a mixer section within said housing downstream from each of said pressure recovery section and said bypass venturi section.
Claim 7
Dependent Claim
19 words
The internal combustion engine of claim 1 , including an engine control module controllably coupled with said bypass valve.
Claim 8
Dependent Claim
15 words
The internal combustion engine of claim 6 , said bypass valve being a butterfly valve.
Claim 9
Dependent Claim
38 words
The internal combustion engine of claim 1 , including a center section within said housing, said bypass valve terminating at said center section, said center section having a through bore, said bypass valve disposed within said through bore.
Claim 10
Dependent Claim
24 words
The internal combustion engine of claim 8 , said pressure recovery section being at least in part between said center section and said housing.
Claim 11
Dependent Claim
15 words
The internal combustion engine of claim 1 , said combustion air supply including a turbocharger.
Claim 12
Dependent Claim
24 words
The internal combustion engine of claim 10 , said combustion air supply including an air-to-air-aftercooler coupled between said turbocharger and said bypass venturi assembly.
Claim 13
Dependent Claim
104 words
A venturi assembly for recirculating exhaust gas in an internal combustion engine, comprising: a housing having an outlet, a combustion air inlet and an exhaust gas inlet; a venturi nozzle in communication with said combustion air inlet, said venturi nozzle defining a bypass venturi section therein, said venturi nozzle and said housing defining a venturi section therebetween terminating at an induction area, said venturi nozzle having a plurality of through holes in communication with a downstream portion of said exhaust gas venturi section, said induction area adjacent said exhaust gas inlet; and a bypass valve positioned to open and close said bypass venturi section.
Claim 14
Dependent Claim
104 words
A venturi assembly for recirculating exhaust gas in an internal combustion engine, comprising: a housing having an outlet, a combustion air inlet and an exhaust gas inlet; a venturi nozzle in communication with said combustion air inlet, said venturi nozzle defining a bypass venturi section therein, said venturi nozzle and said housing defining a venturi section therebetween terminating at an induction area, said venturi nozzle having a plurality of through holes in communication with a downstream portion of said exhaust gas venturi section, said induction area adjacent said exhaust gas inlet; and a bypass valve positioned to open and close said bypass venturi section.
Claim 15
Dependent Claim
28 words
The venturi assembly of claim 12 , including an annular receiver section between said venturi nozzle and said housing immediately downstream from and adjacent to said induction area.
Claim 16
Dependent Claim
17 words
The venturi assembly of claim 13 , said annular receiver section having a substantially constant cross-sectional area.
Claim 17
Dependent Claim
48 words
The venturi assembly of claim 13 , including a pressure recovery section between said venturi nozzle and said housing immediately downstream from and adjacent to said annular receiver section, said pressure recovery section having an increasing cross-sectional area in a direction extending away from said annular receiver section.
Claim 18
Dependent Claim
27 words
The venturi assembly of claim 15 , including a mixer section within said housing downstream from each of said pressure recovery section and said bypass venturi section.
Claim 19
Dependent Claim
37 words
The venturi assembly of claim 12 , including a center section within said housing, said bypass valve terminating at said center section, said center section having a through bore, said bypass valve disposed within said through bore.
Claim 20
Dependent Claim
21 words
The venturi assembly of claim 17 , said pressure recovery section being in part between said center section and said housing.
Claim 21
Independent Claim
140 words
A method of recirculating exhaust gas in an internal combustion engine, comprising the steps of: providing a bypass venturi assembly including a housing having a combustion air inlet, an exhaust gas inlet and an outlet, a venturi nozzle in communication with said combustion air inlet, said venturi nozzle defining a bypass venturi section therein, said venturi nozzle and said housing defining an exhaust gas venturi section therebetween terminating at an induction area, said venturi nozzle having a plurality of through holes in communication with a downstream portion of said exhaust gas venturi section; transporting combustion air to said combustion air inlet; transporting exhaust gas to said exhaust gas inlet and said induction area; and selectively operating a bypass valve to open and close said bypass venturi section and thereby control an amount of exhaust gas inducted at said induction area.
Claim 22
Independent Claim
140 words
A method of recirculating exhaust gas in an internal combustion engine, comprising the steps of: providing a bypass venturi assembly including a housing having a combustion air inlet, an exhaust gas inlet and an outlet, a venturi nozzle in communication with said combustion air inlet, said venturi nozzle defining a bypass venturi section therein, said venturi nozzle and said housing defining an exhaust gas venturi section therebetween terminating at an induction area, said venturi nozzle having a plurality of through holes in communication with a downstream portion of said exhaust gas venturi section; transporting combustion air to said combustion air inlet; transporting exhaust gas to said exhaust gas inlet and said induction area; and selectively operating a bypass valve to open and close said bypass venturi section and thereby control an amount of exhaust gas inducted at said induction area.
Claim 23
Dependent Claim
40 words
The method of claim 19 , including the step of increasing a pressure of the inducted exhaust gas within a pressure recovery section between said venturi nozzle and said housing immediately downstream from and adjacent to said annular receiver section.
Claim 24
Dependent Claim
37 words
The method of claim 20 , including the step of mixing said exhaust gas with combustion air in a mixer section within said housing downstream from each of said pressure recovery section and said bypass venturi section.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-08-25 | 2007-02-24 | 2007-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-08-25 | 2011-02-24 | 2011-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-08-25 | 2015-02-24 | 2015-08-26 | $7700.00 | Window Closed / Lapsed |