Patent US3650849A successfully refreshed from Google Patents.
Patent EP1138928A2 successfully refreshed from Google Patents.
EP1138928A2
Expired / Lapsed
EP
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Turbocharged engine with exhaust gas recirculation
Assignee: Mack Trucks Inc
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Filing: 2001-03-27
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Granted: —
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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
EP
Data Source
google_patents
Last Synchronized
2026-11-05 21:44
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: 18
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
19 words
The engine assembly of claim 1, wherein said pressure adjusting feature is a
venturi disposed at said second point.
Claim 3
Dependent Claim
17 words
The engine assembly of claim 2, further comprising a cooler disposed along said
exhaust gas recirculation line.
Claim 4
Dependent Claim
15 words
The engine assembly of claim 3, further comprising a cooler along said air intake
line.
Claim 5
Dependent Claim
17 words
The engine assembly of claim 4, further comprising a valve disposed along said
exhaust gas recirculation line.
Claim 6
Dependent Claim
16 words
The engine assembly of claim 5, further comprising a valve disposed along said
combustion bypass line.
Claim 7
Dependent Claim
30 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 8
Dependent Claim
26 words
The engine assembly of claim 7, wherein said fourth point is disposed along said
portion of said exhaust gas line downstream of said exhaust gas turbine.
Claim 9
Dependent Claim
25 words
The engine assembly of claim 7, further comprising a drive shaft coupled with
said cylinder, wherein said power turbine is coupled with said drive shaft.
Claim 10
Dependent Claim
96 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 11
Dependent Claim
56 words
The engine assembly of claim 10, 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 12
Dependent Claim
31 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 13
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 14
Dependent Claim
40 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 15
Dependent Claim
43 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 16
Dependent Claim
43 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 17
Dependent Claim
35 words
The method of claim 16, 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.
Claim 18
Dependent Claim
44 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.
References Cited (Backward Citations)
US3925989A
Cited
US4215550A
Cited
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