EP3580442A1 - Cylinder head comprising an exhaust gas injection assembly - Google Patents
Cylinder head comprising an exhaust gas injection assemblyInfo
- Publication number
- EP3580442A1 EP3580442A1 EP18706803.6A EP18706803A EP3580442A1 EP 3580442 A1 EP3580442 A1 EP 3580442A1 EP 18706803 A EP18706803 A EP 18706803A EP 3580442 A1 EP3580442 A1 EP 3580442A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder head
- filling chamber
- recirculated
- exhaust gas
- intake
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/243—Cylinder heads and inlet or exhaust manifolds integrally cast together
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
- F02F1/4235—Shape or arrangement of intake or exhaust channels in cylinder heads of intake channels
-
- 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
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
-
- 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
- F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
-
- 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
- F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
- F02M26/44—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which a main EGR passage is branched into multiple passages
Definitions
- the present invention relates to an internal combustion engine having an exhaust gas recirculation system.
- This system often called by its English name “Exhaust Gas Recirculation” (EGR) reduces polluting emissions, including nitrogen oxides (NOx).
- EGR exhaust Gas Recirculation
- NOx nitrogen oxides
- the invention relates to a cylinder head and an exhaust gas injection assembly forming part of the recirculation system.
- the exhaust gas recirculation system (EGR) is installed to take a portion of exhaust gas from the engine exhaust and introduce them into the exhaust ducts. admitting the engine by mixing them with fresh compressed air from the output of a compressor which can be the compressor of a turbocharger. Said fresh compressed air can then pass via a cooler to be conveyed to the intake ducts by an intake manifold fixed against the cylinder head.
- EGR exhaust gas recirculation system
- the HP EGR system generally includes a conveying conduit and an exhaust gas injection assembly.
- the conveying duct makes it possible to bring exhaust gases from the exhaust manifold to the engine intake side. Then, the exhaust gas is injected at the inlet distributor, placed upstream of the intake ducts, by means of the injection system. Thus, the recirculated exhaust gas is mixed with the fresh air in a mixing zone of the intake manifold. This mixing zone is otherwise called “plenum" according to the vocabulary of a person skilled in the art.
- a first structure in the form of stitching, introduces recirculated exhaust gas into the intake manifold, via the injection assembly comprising an intrusive connection (or quilting) in the air inlet duct.
- the injection assembly of such a structure is inefficient and has a problem of homogeneous distribution of recirculated gases injected from one cylinder to another and significant pressure drops in the intake circuit of air.
- a second EGR-HP structure comprises an injection assembly which consists of a distribution rail integrated with the intake distributor.
- this structure has a disadvantage in that the injection assembly, being integrated in the distributor, increases the weight of the latter and the size of said distributor thus impacting the space available in the engine compartment which is the space of the vehicle where the engine is housed with its accessories.
- an object of the invention is to provide an internal combustion engine comprising an exhaust gas injection assembly having a compact structure. Another object of the invention is to propose an exhaust gas injection assembly that does not weigh down the intake manifold and simplifies this distributor.
- the invention provides a cylinder head for an internal combustion engine having at least one cylinder and comprising a compressed fresh air filling chamber.
- the cylinder head further comprises an exhaust gas injection assembly comprising a recirculated gas filling chamber.
- the recirculated gas filling chamber is arranged in the cylinder head and connected to gas intake ducts in the at least one cylinder by at least one injection channel.
- the at least one injection channel is part of the exhaust gas injection assembly.
- all or part of the exhaust gas injection assembly is integrated in the cylinder head. Therefore, the injection assembly is less cumbersome compared to conventional devices.
- the injection assembly is not integrated in the intake distributor, which allows to lighten and simplify the structure of the latter.
- the recirculated gas filling chamber is covered by a removable cover.
- the exhaust gas injection assembly comprises a conveying conduit connected to the exhaust manifold and a recirculated gas filling chamber arranged in the cylinder head.
- Said refilling gas filling chamber has a wall dug in the cylinder head.
- each or the injection channel is connected upstream to said recirculated gas filling chamber and downstream to a mixing zone between fresh compressed air and recirculated gas.
- the inside of the or each injection channel is easily accessible to an operator to allow the cleaning of the injection assembly in case of fouling and limit the cost of labor for the maintenance of the injection assembly.
- the recirculated gas filling chamber is separated from the compressed air filling chamber.
- the term "separated" means that the filling chambers of recirculated gases and compressed air are delimited by at least one wall of material arranged between the two chambers.
- the cylinder head comprising intake ducts which are distributed in a first direction
- the exhaust gas injection assembly comprises the injection channel or several distributed injection channels. (s) following said first direction.
- the exhaust gases introduced into the or each of these injection channels are distributed homogeneously in a mixing zone located upstream of each intake duct.
- the intake ducts receive exhaust gases equally, which ensures an identical combustion quality for each of the engine cylinders into which the intake ducts open.
- a cylinder is connected to the recirculated gas filling chamber by a single injection channel.
- the number of injection channels corresponds to the number of cylinders of the engine. Said injection channels are connected to the delivery ducts. Thus, the intake ducts are served with exhaust gas to optimize the depollution.
- the recirculated gases and the fresh air are mixed in a mixing zone arranged upstream of the intake ducts.
- the compressed air coming from a compression system which may be the compressor part of a turbocharger is mixed with the recirculated gases only in a mixing zone arranged at the upstream edge of the intake ducts of the cylinder head.
- said recirculated gases are conducted from the recirculated gas filling chamber to said mixing zone through the channels injection which preserve the cooler pollution caused by the recirculated gas in case of reflux of said gas from the cylinder head.
- the mixing zone is placed immediately in front of the entrance of the intake ducts.
- the mixing zone may be a part of the intake duct: the recirculated gas injection channel may indeed open into said intake duct.
- the necessary time of displacement of the exhaust gases to the interior of the intake ducts is reduced.
- the exhaust gas injection assembly comprises the at least one injection channel opening into the mixing zone and communicating with the gas filling chamber. exhaust on the other hand.
- the removable cover covers an opening opening into the recirculated gas filling chamber.
- the opening opening into the recirculated gas filling chamber is formed on a part of the or each injection channel which is located inside the cylinder head.
- access to the injection channel is further facilitated.
- the removable cover has a curved profile defining a volume V of exhaust gas filling.
- the removable hood has a curved shape which defines a volume V in which the exhaust gas is fed.
- the shape of the hood can be modified so that it can contain a desired volume of exhaust gas. This conditions the amount of gas sent to each of the intake ducts and therefore the depollution efficiency in each of these conduits.
- the removable cover comprises a flat plate for guiding the recirculated gases.
- the invention also relates to an internal combustion engine comprising a cylinder head having one of the features presented above.
- the invention further relates to a motor vehicle comprising said internal combustion engine.
- FIG. 1 shows a perspective view of a cylinder head according to a first embodiment of the invention comprising an exhaust gas injection assembly and an intake manifold;
- FIG. 2 represents the same view as FIG. 1 but in the absence of the intake distributor
- FIG. 3 shows a sectional view along the plane III-III illustrated in Figure 1;
- FIG. 4 shows a perspective view of a cylinder head according to a second embodiment of the invention comprising an exhaust gas injection assembly and an intake manifold;
- FIG. 5 represents the same view as FIG. 4 but in the absence of the intake distributor
- FIG. 6 shows a rear view of the cylinder head of Figure 4.
- FIG. 7 represents a sectional view along the plane VII-VII illustrated in FIG. 6.
- an intake manifold 41 is connected to a cylinder head 31 on the intake side thereof.
- a removable cover 13 is located above the inlet distributor 31. This removable cover 13 defines a recirculated gas filling chamber 16 dug in the cylinder head 31 and connected with an inlet 12 of exhaust gas.
- These elements belong to an injection assembly 1 of exhaust gas according to the invention, hereinafter abbreviated hereinafter the injection assembly.
- the exhaust gas inlet 12 is connected to a conveying duct (not shown in the figures) which makes it possible to bring exhaust gases from an exhaust manifold (not shown) to the exhaust duct. injection assembly 1.
- an orthogonal reference R associated with all the elements illustrated in FIG. 1 is defined.
- This reference R consists of three axes X, Y and Z perpendicular to each other. the first and second horizontal axes X and Y and the vertical axis Z pointing upwards in FIG. 1.
- the terms “above”, “below”, “below” and “above” are defined with respect to the axis vertical Z, the terms “behind”, “front” or “front”, “back” are defined relative to the second horizontal axis Y.
- a lower compartment 33 it is seen inputs 51 of the intake ducts 5 of the cylinder head 31.
- the engine comprises four cylinders each of which has two inputs. intake and two exhaust inlets.
- the intake ducts 5 are distributed along the first horizontal axis X.
- the lower compartment 33 further comprises a compressed fresh air filling chamber 19 which communicates with the enclosure 43 of the inlet distributor 41.
- the compressed fresh air filling chamber 19 is also shown in FIG.
- a distribution channel 14 is formed in the yoke 31 with its axis L parallel to the first horizontal axis X.
- the distribution channel 14 is part of the recirculated gas filling chamber 16 and has an opening 15.
- the distribution channel 14 intersects the inlet ports 110 of the exhaust gas injection channels 11.
- the injection channels 11 are distributed along the distribution channel 14.
- the injection channels 11 are four in number, the same number as the cylinders.
- the volume of this recirculated gas filling chamber 16 is filled with exhaust gases which are then injected into the injection channels 11 shown in Figure 3.
- the recirculated gas filling chamber 16 being located at the upper compartment 34, is separated from the compressed fresh air filling chamber 19.
- the exhaust gas along the injection channels 11, arrive in a mixing zone 17 of exhaust gas and intake gas.
- the distribution channel 14 extends in the same direction of distribution as the intake ducts 5, the exhaust gases are distributed homogeneously in the same direction and are sent upstream of each duct. 'admission 11'means' upstream of each of these intake ducts »the location located near the inlet 51 inlet ducts 5 in the direction of gas flow.
- the injection channels 11 are inclined relative to the vertical axis Z, in the same direction Y ', so as to have their outlet orifice 18 as close as possible to the inlet 51 of the ducts. admission.
- the mixing zone 17 is located very close, in the immediate vicinity of the inlet 51 of the inlet ducts 5.
- Figures 4 to 7 show an injection assembly 2 according to a second embodiment of the invention.
- An intake distributor 42 is mounted on a cylinder head 32.
- the distributor 42 may for example include a cooler.
- the cylinder head 32 further comprises a compressed fresh air filling chamber 29 which communicates with the intake distributor 42.
- the injection assembly 2 comprises a single exhaust gas inlet 22 located above the intake manifold 42.
- the location of the exhaust gas inlet 22 may be different in that of the exhaust manifold 22.
- Entrance 22 communicates with a distribution channel 14 extending substantially in the horizontal direction X.
- Said distribution channel 14 is hollowed in the wall of the cylinder head and has openings opening into the injection channels 21.
- an engine cylinder may comprise a single intake duct connected with a distribution channel to allow uniform diffusion of the EGR gases in the intake ducts.
- each injection channel 21 opens into a mixing zone 27 which is located near the inlet 51 of the intake ducts. They can also lead directly into the intake duct.
- each injection channel 21 comprises an opening 25 which is situated inside the cylinder head 32.
- the distribution channel 14 communicates with the injection channels 21 which are each closed by a removable cover 23.
- the entire distribution channel 14 and injection channels 21 thus forms a recirculated gas filling chamber 26.
- said chamber 26 is separated from the compressed fresh air filling chamber 29 by said hood removable 23.
- the removable cover 23 is for example a sheet metal plate and which can be screwed to the cylinder head.
- the air coming from the intake distributor 42 is guided by the wall of the hood 23. Therefore, it is preferred here to have a flat guide surface to promote the internal airflow performance of the cylinder head and avoid losses.
- the operator simply removes the intake distributor 42 and the removable cover 23, to access the injection channels 21 and clean them.
- Another advantage of the removable cover 23 according to the second embodiment is to prevent the escape of the exhaust gas to the inlet distributor 42, especially when the latter comprises a cooler. Indeed, since the exhaust gases contain harmful and corrosive components, they can damage the cooler by passing through it. For this reason, the removable hood 23 is an effective means for protecting the exhaust gas cooler.
- the injection channels 21 may be arranged to have their opening 25 located outside of the cylinder head 32. In this way, the removable cover 23 will be outside. of the cylinder head 32. Thus, it is no longer necessary to disassemble the intake distributor 42 to access the removable cover 23.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1751007A FR3062684B1 (en) | 2017-02-07 | 2017-02-07 | CYLINDER HEAD INCLUDING AN EXHAUST GAS INJECTION ASSEMBLY |
PCT/FR2018/050293 WO2018146413A1 (en) | 2017-02-07 | 2018-02-06 | Cylinder head comprising an exhaust gas injection assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3580442A1 true EP3580442A1 (en) | 2019-12-18 |
Family
ID=58501700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18706803.6A Withdrawn EP3580442A1 (en) | 2017-02-07 | 2018-02-06 | Cylinder head comprising an exhaust gas injection assembly |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3580442A1 (en) |
FR (1) | FR3062684B1 (en) |
WO (1) | WO2018146413A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3098866B1 (en) * | 2019-07-17 | 2021-06-11 | Renault Sas | Distributor with integrated flow and duct separation |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5377223U (en) * | 1976-12-01 | 1978-06-27 | ||
JPS57186049A (en) * | 1981-05-13 | 1982-11-16 | Daihatsu Motor Co Ltd | Control device of exhaust gas recirculation in internal combustion engine |
EP0718480A1 (en) * | 1994-11-25 | 1996-06-26 | Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT | Exhaust apparatus for internal combustion engine |
JP2000161131A (en) * | 1998-12-01 | 2000-06-13 | Honda Motor Co Ltd | Cylinder head structure for multiple-cylinder engine |
JP4537615B2 (en) * | 2001-05-17 | 2010-09-01 | 本田技研工業株式会社 | EGR gas recirculation device for internal combustion engine |
JP2004293418A (en) * | 2003-03-27 | 2004-10-21 | Mazda Motor Corp | Engine exhaust gas recirculation device |
DE102006018830A1 (en) * | 2006-04-22 | 2007-10-25 | Daimlerchrysler Ag | Internal combustion engine, has exhaust gas recycling pipelines that discharge into inlet channel via blended opening and have section, which is arranged within outer contour of cylinder head |
CN201025149Y (en) * | 2007-03-02 | 2008-02-20 | 安徽江淮汽车股份有限公司 | A gas cylinder cover of gasoline engine |
DE102010002233A1 (en) * | 2010-02-23 | 2011-08-25 | Behr GmbH & Co. KG, 70469 | Device for exhaust gas recirculation for an internal combustion engine |
FR2958337B1 (en) * | 2010-03-31 | 2013-03-01 | Valeo Systemes Thermiques | MANIFOLD FOR GAS DISTRIBUTION IN THE CYLINDER HEAD OF AN ENGINE, ASSEMBLY OF A DISTRIBUTION MANIFOLD AND A CYLINDER HEAD. |
-
2017
- 2017-02-07 FR FR1751007A patent/FR3062684B1/en active Active
-
2018
- 2018-02-06 WO PCT/FR2018/050293 patent/WO2018146413A1/en unknown
- 2018-02-06 EP EP18706803.6A patent/EP3580442A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2018146413A1 (en) | 2018-08-16 |
FR3062684B1 (en) | 2021-04-30 |
FR3062684A1 (en) | 2018-08-10 |
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