GB2481024A - Exhaust Gas Recirculation valve assembly incorporating a fluid coolant circuit - Google Patents

Exhaust Gas Recirculation valve assembly incorporating a fluid coolant circuit Download PDF

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Publication number
GB2481024A
GB2481024A GB1009567.7A GB201009567A GB2481024A GB 2481024 A GB2481024 A GB 2481024A GB 201009567 A GB201009567 A GB 201009567A GB 2481024 A GB2481024 A GB 2481024A
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GB
United Kingdom
Prior art keywords
valve
egr
exhaust gas
valve assembly
pass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1009567.7A
Other versions
GB2481024B (en
GB201009567D0 (en
Inventor
Domenico Rampone
Pietro Taruffi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GM Global Technology Operations LLC
Original Assignee
GM Global Technology Operations LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GM Global Technology Operations LLC filed Critical GM Global Technology Operations LLC
Priority to GB1009567.7A priority Critical patent/GB2481024B/en
Publication of GB201009567D0 publication Critical patent/GB201009567D0/en
Publication of GB2481024A publication Critical patent/GB2481024A/en
Application granted granted Critical
Publication of GB2481024B publication Critical patent/GB2481024B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/72—Housings
    • F02M26/73—Housings with means for heating or cooling the EGR valve
    • F02M25/07—
    • F02M25/0735—
    • F02M25/077—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels

Abstract

An Exhaust Gas Recirculation (EGR) valve assembly for an internal combustion engine, the valve assembly being provided with an exhaust gas conduit 23 for recirculating the exhaust gas back into the engine, the conduit being intercepted by an EGR valve. The EGR valve is connected to a valve actuating means comprising electrical components to control the quantity of exhaust gas that flows back into the engine, the valve assembly comprising a single coolant circuit 21 for a refrigerating fluid that wraps around, at least partially, an external surface 24 of a drop -in EGR valve. The assembly may further comprise an EGR gas bypass circuit, the circuit being intercepted by a by-pass valve having an actuator controlled by-pass valve shaft, and the coolant circuit having a second portion that wraps around, at least partially, the by-pass shaft. The refrigerating fluid may circulate in the coolant circuit countercurrent to the exhaust gas.

Description

EXHAUST GAS RECIRCULATION (EGR) VALVE ASSEMBLY FOR AN INTEBNAL
COMBUSTION ENGINE
TEcHNICAL FIElD
The present invention relates to an Exhaust Gas Recirculation (EGR) valve assembly for an Internal Canbustion Engine.
BACIDU
As it is known, the Exhaust Gas Recirculation (EGR) is a system that works by recirculating a portion of an engine's exhaust gas back to the engine cylinders, passing it through a cooler in order to reduce the maximum temperatures reached in the combustion and thus the amount of NO generated by the ccrtibustion.
Different configurations for the high pressure (short-route) EGR module that have an EGR valve that regulates the flow of exhaust gas and that is placed in the hot side of the cooler are currently present in the market.
In this cases, the EGR valve is placed in the hot side mainly for reducing valve sticking issues.
All these known configurations need a specific cooling circuit for the EGR valve itself because hotter EGR temperatures require external cooling to prevent overheating of several components, such as electronic components, seals, housing for the valve and so on.
However a design of the EGR valve housing that incorporates an additional cooling circuit creates severe packaging issues, especially in small diesel engines.
Another problem is that the valve cooling system may be affected over time by leakage and pressure drop.
An object of an embodiment of the valve assembly of the present invention is to optimize the heat exchange surface between hot gas circuit and valve housing, especially for small Diesel engine applications.
Another object is to provide an EGR valve circuit design that is able to reduce pressure drop and that can be used to cool down the by-pass flap shaft as well.
Another object of the present invention is to meet these goals by means of a cost-effective and rational solution.
These objects are achieved by a EGR valve assembly and an Internal Combustion Engine (ICE) having the features recited in the independent claims.
The dependent claims delineate preferred and/or especially advantageous aspects of the invention.
SRY
An embodiment of the invention provides for an Exhaust Gas Recirculation (EGR) valve assembly for an Internal Combustion Engine, the valve assembly being provided with an exhaust gas conduit for recirculating said exhaust gas back into said engine, said conduit being intercepted by an EGR valve, said EGR valve being connected to valve actuating means comprising electrical components to control the quantity of said exhaust gas that flows back into said engine, said valve assembly comprising a single coolant circuit for a refrigerating fluid that wraps around, at least partially, to an external surface of said valve.
The advantage of this embodiment is that it obtains a cooling effect on the EGR valve without the need of a dedicated cooling circuit, while at the same time optimizing the packaging of the EGR valve assembly.
According to another embodiment said EGR valve is a drop-in valve having a drop-in portion.
Advantageously, this embodiment allows for the use of a valve that does not need to be configured specifically to be mounted inside the EGR valve assembly.
According to a further embodiment, a first portion of said coolant circuit wraps around at least partially to the drop-in portion of said valve.
The advantage of this embodiment is that it optimizes the heat exchange of the EGR valve.
According to a further embodiment, said first portion of coolant circuit wraps around the drop-in portion of said valve for a minimum angle of 2700 degrees of exposure.
An advantage of this embodiment is that it allows the coolant fluid to envelope a substantial part of the EGR valve, improving cooling effect.
According to a still further embodiment, said EGR valve assembly comprises a EGR gas by-pass circuit, said by-pass circuit being intercepted by a by-pass valve, said by-pass valve having an actuator acting on a by-pass valve shaft, said valve assembly coolant circuit having a second portion that wraps around, at least partially, to said by-pass shaft.
This embodiment allows to protect the sealing components of the by-pass circuit using the same cooling circuit used for the EGR valve.
In a further another embodiment said second portion of coolant circuit wraps around to the by-pass shaft of said by-pass valve for a minimum angle of 2000 degrees of exposure.
This embodiment allows the cooling fluid to envelope a substantial part of by-pass shaft, improving cooling effect In another embodiment the refrigerating fluid circulating into said coolant circuit is circulating countercurrent with respect to said exhaust gas.
This embodiment allows an improved cooling effect for the whole assembly.
In aspect of the invention further provides for an internal combustion engine having an Exhaust Gas Recirculation (EGR) valve assembly as claimed.
BRIEF DESCRIPTIQT OF THEI DRAWINGS
The embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a top view of an embodiment of the EGR assembly according
to the present description;
Figure 2 is a side view of an embodiment of the EGR assembly
according to the present description;
Figure 3 is a cross-section according to plane B-B of figure 1; and Figure 4 is a cross-section according to plane C-C of figure 1.
DESCRIPTICI OF THE PREFERRED 4BCDIMT Preferred embodiments of the EGR cooler valve assembly 10 will now be described in detail with reference to the enclosed drawings.
In fig 1 and 2 an EGR cooler 11 having an EGR valve 12 is shown. The EGR cooler has an inlet 13 and an outlet 14 for the exhaust gas and an inlet 15 and an outlet 16 for a coolant fluid circulating in the EGR cooler.
The coolant fluid circulates preferably in countercurrent with respect to the EGR gas in order to improve cooling effect.
The EGR valve 12 is a drop-in valve inserted in a EGR cooler in order to create an EGR valve cooler assembly; in particular, the valve 12 has a drop-in portion 17 (fig. 3-4), suitable to be inserted in a corresponding EGR cooler portion 18 and intercepts the exhaust gas recirculating through an exhaust gas conduit 23 back to the engine.
Also, the valve 12 has a plate inserted into the conduit in which the hot EGR fluid flows in order to control the amount of EGR gas that flows back into the intake manifold.
In order to realize such control function, the EGR valve is actuated in a known way by electronic means.
The assembly comprises also a EGR gas by-pass circuit useful to by-pass the EGR cooler in certain operating conditions of the engine, said by-pass circuit having a shaft 19, said shaft 19 being provided with a by-pass flap in order to configure a by-pass valve and actuated by means of an actuator 20.
According to an embodiment, the coolant circuit for the coolant fluid circulating in the EGR cooler is configured to the refrigerate also the EGR cooler valve 12 and, in particular, the EGR valve drop-in 17.
For this function, the circuit is provided with a coolant fluid jacket 21 that allows the coolant fluid to flow around valve drop-in 17. The coolant fluid jacket 21 surrounds, or wraps around, the valve drop-in 17 and, in particular, wraps around an external surface 24 of the EGR valve 12 for a minimum angle of 270° of exposure of the EGR valve drop-in 17 to the coolant fluid. In fig. 4 a further example is shown in which the coolant fluid jacket 21 surrounds valve drop-in 17 for an angle of 285°. The minimum coolant circuit volume of this portion is 100cc.
According to a further embodiment, to protect sealing components, is also provided that the circuit above configures a coolant fluid jacket 22 around the by-pass shaft of the EGR by pass circuit, as shown in fig 3. The minimum angle of exposure of the by-pass shaft to coolant fluid is 2000. The minimum coolant circuit volume is 40cc.
An exarrle provided in fig. 3 shows an angle of exposure of 2380 37'.
In operation the coolant fluid, entering from inlet 15, flows though the valve assembly in order to cool the EGR gas, then flows first around the by-pass shaft 19, as indicated by the arrow Fl in fig. 3, and subsequently around the valve drop-in 17, as indicated by the arrow F2 in fig. 4 and finally exits from outlet 16.
The coolant fluid can be, for example, water.
The embodiments described have several important advantages.
A first benefit is that the EGR valve assembly described allows for the optimization of coolant flow speed and of heat exchange.
Also the EGR valve described has a reduced number of connections and gasket.
Furthermore this allows for an easier and cheaper management of service parts.
A further benefit is that the described cooling circuit is useful also for cooling the by-pass valve shaft as well.
Finally the embodiments can be realized in order to obtain a cheaper EGR valve design and using non-expensive materials.
While at least one exemplary embodiment has been presented in the foregoing sunmnary and detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration in any way. Rather, the foregoing summary and detailed description will provide those skilled in the art with a convenient road map for implementing at least one exemplary embodiment, it being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope as set forth in the appended claims and their legal equivalents. C1A

Claims (8)

1. An Exhaust Gas Recirculation (EGR) valve assembly (10) for an Internal Combustion Engine, the valve assembly (10) being provided with an exhaust gas conduit (23) for recirculating said exhaust gas back into said engine, said conduit (23) being intercepted by an EGR valve (12), said EGR valve (12) being connected to valve actuating means comprising electrical components to control the quantity of said exhaust gas that flows back into said engine, said valve assembly (10) comprising a single coolant circuit (21,22) for a refrigerating fluid that wraps around, at least partially, to an external surface (24) of said valve (12).
2. An EGR valve assembly according to claim 1, wherein said EGR valve (12) is a drop-in valve having a drop-in portion (17).
3. Ni EGR valve assembly according to claim 2, wherein a first portion of said coolant circuit (21) wraps around at least partially to the drop-in portion (17) of said valve (12).
4. An EGR valve assembly according to claim 3, wherein said first portion of coolant circuit (21) wraps around the drop-in portion (17) of said valve (12) for a minimum angle of 270° degrees of exposure.
5. An EGR valve assembly according to claim 1, wherein said EGR valve assembly comprises a EGR gas by-pass circuit, said by-pass circuit being intercepted by a by-pass valve, said by-pass valve having an actuator (20) acting on a by-pass valve shaft (19), said valve assembly coolant circuit having a second portion (22) that wraps around, at least partially, to said by-pass shaft (19).
6. An EGR valve assembly according to claim 5, wherein said second portion of coolant circuit (22) wraps around to the by-pass shaft (19) of said by-pass valve for a minimum angle of 2000 degrees of exposure.
7. An EGR valve asserrly according to claim 1, in which the refrigerating fluid circulating into said coolant circuit (21,22) is circulating countercurrent with respect to said exhaust gas.
8. Internal combustion engine having an Exhaust Gas Recirculation (EGR) valve assembly according to any of the preceding claims.
GB1009567.7A 2010-06-08 2010-06-08 Exhaust gas recirculation (EGR) valve assembly for an internal combustion engine Expired - Fee Related GB2481024B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1009567.7A GB2481024B (en) 2010-06-08 2010-06-08 Exhaust gas recirculation (EGR) valve assembly for an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1009567.7A GB2481024B (en) 2010-06-08 2010-06-08 Exhaust gas recirculation (EGR) valve assembly for an internal combustion engine

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GB201009567D0 GB201009567D0 (en) 2010-07-21
GB2481024A true GB2481024A (en) 2011-12-14
GB2481024B GB2481024B (en) 2015-12-16

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07310604A (en) * 1994-05-16 1995-11-28 Unisia Jecs Corp Exhaust gas reflux control valve
EP1355057A2 (en) * 2002-04-20 2003-10-22 Gustav Wahler GmbH u. Co.KG Exhaust gas recirculation device for an internal combustion engine
DE10344218A1 (en) * 2003-09-22 2005-04-14 Mahle Filtersysteme Gmbh Exhaust gas return control valve for a combustion engine especially a motor vehicle has housing with an actuator and a channel for a cooling medium
WO2008142263A2 (en) * 2007-04-05 2008-11-27 Ifp Installation for cooling recirculated internal combustion engine exhaust gases and control valve for the flow of said gases
US20090056682A1 (en) * 2007-08-28 2009-03-05 Aisan Kogyo Kabushiki Kaisha EGR cooler bypass switching system
WO2009141945A1 (en) * 2008-05-19 2009-11-26 三菱電機株式会社 Device for mounting exhaust gas circulation valve of drop-in type
US20100108041A1 (en) * 2006-05-19 2010-05-06 Andreas Gruner Valve arrangement for an exhaust gas recirculation device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07310604A (en) * 1994-05-16 1995-11-28 Unisia Jecs Corp Exhaust gas reflux control valve
EP1355057A2 (en) * 2002-04-20 2003-10-22 Gustav Wahler GmbH u. Co.KG Exhaust gas recirculation device for an internal combustion engine
DE10344218A1 (en) * 2003-09-22 2005-04-14 Mahle Filtersysteme Gmbh Exhaust gas return control valve for a combustion engine especially a motor vehicle has housing with an actuator and a channel for a cooling medium
US20100108041A1 (en) * 2006-05-19 2010-05-06 Andreas Gruner Valve arrangement for an exhaust gas recirculation device
WO2008142263A2 (en) * 2007-04-05 2008-11-27 Ifp Installation for cooling recirculated internal combustion engine exhaust gases and control valve for the flow of said gases
US20090056682A1 (en) * 2007-08-28 2009-03-05 Aisan Kogyo Kabushiki Kaisha EGR cooler bypass switching system
WO2009141945A1 (en) * 2008-05-19 2009-11-26 三菱電機株式会社 Device for mounting exhaust gas circulation valve of drop-in type

Also Published As

Publication number Publication date
GB2481024B (en) 2015-12-16
GB201009567D0 (en) 2010-07-21

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20170608