US6470864B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbocharged engine with exhaust gas recirculation
Assignee: Mack Trucks Inc
•
Filing: 2001-03-27
•
Granted: 2002-10-29
•
Expires: 2021-03-27
Abstract
Abstract A turbocharged internal combustion engine assembly with exhaust gas recirculation (EGR) includes an air compressor driven by an exhaust turbine, an EGR line that diverts exhaust gases from an exhaust line leading from the engine to an air intake line leading to the engine from the compressor, and a combustion bypass line that conveys compressed air from the compressor to the exhaust turbine without combustion. A pressure adjusting feature disposed along at least one of the air intake line and the exhaust line maintains the pressure at the turbine inlet below the pressure at the compressor outlet and above the pressure at the air inlet of the engine. Examples of suitable pressure adjusting features include a venturi placed in the air intake line at the second point, a power turbine located along the exhaust line downstream of the exhaust turbine, a split exhaust manifold feeding unequal turbine inlets, and an orifice located along the exhaust line between the EGR line and the bypass line.
Inventors
- 👤 Charlie C. Kim
- 👤 Robert Gorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:43
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/04; F02B37/10; F02B37/005; F02B37/12; F02B37/16; F02M; F02M26/00; F02M26/13; F02M26/17; F02M26/19; F02B37/007; F02M26/02; F02M26/04; F02M26/05; F02M26/06; F02M26/08; F02M26/22; F02M26/23; F02M26/25; F02M26/38; F02M26/42; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
181 words
A turbocharged internal combustion engine assembly with exhaust gas recirculation comprising an internal combustion engine having an air intake and an exhaust gas outlet; an exhaust gas turbine having a turbine inlet and a turbine outlet; an air compressor driven by said exhaust gas turbine; an air intake line extending from said compressor to said engine intake; an exhaust line extending from said exhaust gas outlet to said turbine inlet; an exhaust gas recirculation line extending from a first point on said exhaust line downstream of said engine to a second point on said air intake line upstream of said engine; a combustion bypass line extending directly from a third point on said air intake line upstream of said exhaust gas recirculation line to a fourth point on said exhaust line downstream of said exhaust gas recirculation line; and a pressure adjusting feature disposed along at least one of said air intake line and said exhaust gas line to maintain the pressure at said fourth point below the pressure at said third point and above the pressure at said second point.
Claim 2
Dependent Claim
181 words
A turbocharged internal combustion engine assembly with exhaust gas recirculation comprising an internal combustion engine having an air intake and an exhaust gas outlet; an exhaust gas turbine having a turbine inlet and a turbine outlet; an air compressor driven by said exhaust gas turbine; an air intake line extending from said compressor to said engine intake; an exhaust line extending from said exhaust gas outlet to said turbine inlet; an exhaust gas recirculation line extending from a first point on said exhaust line downstream of said engine to a second point on said air intake line upstream of said engine; a combustion bypass line extending directly from a third point on said air intake line upstream of said exhaust gas recirculation line to a fourth point on said exhaust line downstream of said exhaust gas recirculation line; and a pressure adjusting feature disposed along at least one of said air intake line and said exhaust gas line to maintain the pressure at said fourth point below the pressure at said third point and above the pressure at said second point.
Claim 3
Dependent Claim
32 words
The engine assembly of claim 1 , wherein said pressure adjusting feature is an orifice disposed along said exhaust gas line downstream of said first point and upstream, of said third point.
Claim 4
Dependent Claim
97 words
The engine assembly of claim 1 , wherein said exhaust turbine includes a plurality of inlets having different cross-sectional areas and said pressure adjusting feature includes said turbine inlets, wherein said exhaust manifold includes a first manifold portion communicating with a first set of engine cylinders and a second manifold portion communication with a second set of engine cylinders, gas line extends from a first set of cylinders to a first of said turbine inlets, and further comprising a second exhaust gas line extending from a second set of cylinders to a second of said turbine inlets.
Claim 5
Dependent Claim
57 words
The engine assembly of claim 3 , wherein said return line extends from a fifth point on said first exhaust gas line to a sixth point along said charging air line, and further comprising a second return line extending from a seventh point on said second exhaust gas line to an eight point on said return line.
Claim 6
Dependent Claim
31 words
The engine assembly of claim 1 , wherein said pressure adjusting feature includes a power turbine disposed along a portion of said exhaust gas line downstream of said exhaust gas turbine.
Claim 7
Dependent Claim
26 words
The engine assembly of claim 1 wherein said fourth point is disposed along said portion of said exhaust gas line downstream of said exhaust gas turbine.
Claim 8
Dependent Claim
26 words
The engine assembly of claim 5 , further comprising a drive shaft coupled with said cylinder, wherein said power turbine is coupled with said drive shaft.
Claim 9
Dependent Claim
20 words
The engine assembly of claim 1 , wherein said pressure adjusting feature is a venturi disposed at said second point.
Claim 10
Dependent Claim
18 words
The engine assembly of claim 8 , further comprising a cooler disposed along said exhaust gas recirculation line.
Claim 11
Dependent Claim
16 words
The engine assembly of claim 9 , further comprising a cooler along said air intake line.
Claim 12
Dependent Claim
18 words
The engine assembly of claim 9 , further comprising a valve disposed along said exhaust gas recirculation line.
Claim 13
Dependent Claim
17 words
The engine assembly of claim 11 , further comprising a valve disposed along said combustion bypass line.
Claim 14
Independent Claim
213 words
A method of operating a turbocharged internal combustion engine with exhaust gas recirculation comprising the steps of feeding exhaust gas from the engine to an exhaust turbine via an exhaust line; compressing air with an air compressor powered by the exhaust turbine; feeding compressed air from the air compressor to the engine via an air intake line; providing an exhaust gas recirculation line between a first point on the exhaust line downstream of the engine and a second point on the air intake line upstream of the engine; providing a combustion bypass line between a third point on the air intake line upstream of the second point and a fourth point on the exhaust line downstream of the first point; and adjusting the pressure in at least one of the intake air line and the exhaust line such that the pressure at the fourth point is below the pressure at the third point and above the pressure at the second point so that a first portion of the exhaust gas from the engine is mixed with a first portion of the compressed air from the compressor for combustion in the engine and a second portion of the compressed air is diverted from the air intake line to the exhaust line without subsequent combustion.
Claim 15
Independent Claim
213 words
A method of operating a turbocharged internal combustion engine with exhaust gas recirculation comprising the steps of feeding exhaust gas from the engine to an exhaust turbine via an exhaust line; compressing air with an air compressor powered by the exhaust turbine; feeding compressed air from the air compressor to the engine via an air intake line; providing an exhaust gas recirculation line between a first point on the exhaust line downstream of the engine and a second point on the air intake line upstream of the engine; providing a combustion bypass line between a third point on the air intake line upstream of the second point and a fourth point on the exhaust line downstream of the first point; and adjusting the pressure in at least one of the intake air line and the exhaust line such that the pressure at the fourth point is below the pressure at the third point and above the pressure at the second point so that a first portion of the exhaust gas from the engine is mixed with a first portion of the compressed air from the compressor for combustion in the engine and a second portion of the compressed air is diverted from the air intake line to the exhaust line without subsequent combustion.
Claim 16
Dependent Claim
41 words
The method of claim 13 , wherein said pressure adjusting step includes the step of passing the first compressed air portion through a venturi, wherein the second exhaust gas portion is mixed with the first compressed air portion in the venturi.
Claim 17
Dependent Claim
44 words
The method of claim 13 , wherein said pressure adjusting step includes the step of driving a power turbine with exhaust gases from the exhaust turbine via an extension of the exhaust line and connecting the combustion bypass lie with the exhaust line extension.
Claim 18
Dependent Claim
45 words
The method of claim 13 , wherein said pressure adjusting step includes the step of passing exhaust gases from the engine through an orifice in the exhaust line such that the pressure downstream of the orifice is lower than the pressure upstream of the orifice.
Claim 19
Dependent Claim
44 words
The method of claim 13 , wherein said pressure adjusting step includes the steps of feeding exhaust gases from a first set of cylinders to a first turbine inlet and feeding exhaust gases from a second set of cylinders to a second turbine inlet.
Claim 20
Dependent Claim
36 words
The method of claim 17 , wherein the second turbine inlet is smaller than the first turbine inlet, and wherein the first compressed air portion is mixed with exhaust gases from the first set of cylinders.
References Cited (Backward Citations)
US3925989A
Cited
US3996748A
Cited
US4215550A
Cited
US4164032A
Cited
US4142493A
Cited
US4164206A
Cited
US4440140A
Cited
US4452217A
Cited
US4426848A
Cited
US4446840A
Cited
US4450824A
Cited
US4594993A
Cited
US4625702A
Cited
DE3807372A1
Cited
US5363091A
Cited
US5758309A
Cited
WO1995012335A1
Cited
US5440880A
Cited
US5625750A
Cited
US5703777A
Cited
WO1996018031A1
Cited
US5921223A
Cited
US5890359A
Cited
US5802846A
Cited
US6038860A
Cited
US5924280A
Cited
US5771867A
Cited
WO1999031373A1
Cited
US6324846B1
Cited
US6276139B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-10-28 | 2006-04-29 | 2006-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-10-28 | 2010-04-29 | 2010-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-10-28 | 2014-04-29 | 2014-10-29 | $7700.00 | Window Closed / Lapsed |