EP1213467A2
Expired / Lapsed
EP
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Venturi bypass exhaust gas recirculation system
Assignee: Caterpillar Inc
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Filing: 2001-09-27
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Granted: —
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Expires: 2021-09-27
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
EP
Data Source
google_patents
Last Synchronized
2026-11-03 21:03
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: 20
Claim 1
Independent Claim
109 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
16 words
The internal combustion engine of claim
1, said bypass valve being a spring loaded check
valve.
Claim 3
Dependent Claim
25 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 4
Dependent Claim
16 words
The internal combustion engine of claim
3, said combustion air supply including an exhaust gas
turbocharger.
Claim 5
Dependent Claim
16 words
The internal combustion engine of claim
1, said combustion air supply including an exhaust gas
turbocharger.
Claim 6
Dependent Claim
46 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 7
Dependent Claim
35 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 8
Dependent Claim
35 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 9
Dependent Claim
17 words
The internal combustion engine of claim
8, including an aftercooler in said fluid line from
said compressor.
Claim 10
Dependent Claim
35 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 11
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 12
Dependent Claim
16 words
The venturi bypass system of claim 11,
said bypass valve being a spring loaded check valve.
Claim 13
Dependent Claim
63 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 14
Dependent Claim
16 words
The venturi bypass system of claim 13,
said bypass valve being a spring loaded check valve.
Claim 15
Dependent Claim
19 words
The venturi bypass system of claim 14,
said check valve being responsive to differential
pressure on opposite sides thereof.
Claim 16
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 17
Dependent Claim
20 words
The method of claim 16, including
selectively operating a bypass valve in response to
pressure drop across said venturi assembly.
Claim 18
Dependent Claim
31 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 19
Dependent Claim
43 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 20
Dependent Claim
33 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)
US5802846A
Cited
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