EP3914814A1 - Circuit d'admission d'air à l'échappement d'un moteur à combustion interne - Google Patents
Circuit d'admission d'air à l'échappement d'un moteur à combustion interneInfo
- Publication number
- EP3914814A1 EP3914814A1 EP20701191.7A EP20701191A EP3914814A1 EP 3914814 A1 EP3914814 A1 EP 3914814A1 EP 20701191 A EP20701191 A EP 20701191A EP 3914814 A1 EP3914814 A1 EP 3914814A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- exhaust
- air
- duct
- cylinder head
- air 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/30—Arrangements for supply of additional air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/001—Exhaust gas flow channels or chambers being at least partly formed in the structural parts of the engine or machine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- Air intake circuit for the exhaust of an internal combustion engine Air intake circuit for the exhaust of an internal combustion engine.
- the invention relates to an air intake circuit for the exhaust of an internal combustion engine.
- the invention also relates to a method of obtaining such a circuit for admitting air to the exhaust.
- the invention also relates to a cylinder head of such a circuit for admitting air to the exhaust.
- the invention also relates to an internal combustion engine comprising such an air intake circuit to
- the invention also relates to a vehicle comprising such an internal combustion engine and / or such a cylinder head and / or such a circuit for admitting air to the exhaust.
- An internal combustion engine in particular fitted to a motor vehicle, generally comprises one or more pollution control elements such as for example a catalyst converter, a particulate filter, or even an SCR device for the English term “selective catalytic reduction ”.
- pollution control elements such as for example a catalyst converter, a particulate filter, or even an SCR device for the English term “selective catalytic reduction ”.
- these depollution elements are only effective from a certain temperature, for example of the order of 400 degrees Celsius.
- fresh air is generally injected into the exhaust.
- An injection or exhaust air intake circuit is then provided.
- the introduction of this fresh air generally under pressure, causes combustion at the exhaust which generates exothermic energy, that is to say an increase in temperature. Thanks to this exothermic energy, the pollution control elements are effective shortly after starting the internal combustion engine.
- the object of the invention is to provide an air intake circuit to the exhaust overcoming the above drawbacks and improving the air intake circuits to the exhaust known from the prior art .
- the invention provides a circuit offering reduced pressure drops.
- the invention relates to an air intake circuit to the exhaust of an internal combustion engine comprising at least one cylinder and a cylinder head, the cylinder head closing a combustion chamber of the at least one cylinder and comprising at least one exhaust duct for conducting a flow of gas from exhaust from the combustion chamber of the at least one cylinder to an exhaust circuit connected to the cylinder head by an exhaust face of said cylinder head, the at least one exhaust duct comprising an upstream mouth, controlled by a exhaust valve, facing the combustion chamber, the air intake circuit for the exhaust comprising a main chamber extending along a first axis orthogonal or substantially orthogonal to the main axis of the at least a cylinder and parallel to the exhaust face of the cylinder head, the main chamber being connected upstream in the direction of air flow to a fresh air intake circuit of such an internal combustion engine and in downstream to at least one conduit exhaust.
- the air intake circuit to the exhaust may include a channel connected upstream to a fresh air intake circuit of such an internal combustion engine, the channel may extend parallel or substantially parallel to the main axis of the at least one cylinder and capable of opening into the main chamber downstream.
- the air intake circuit to the exhaust may include at least one air duct extending between the main chamber and at least one exhaust duct so as to diffuse the air at the level an exhaust valve of the at least one exhaust duct, in particular the circuit for admitting air to the exhaust, may comprise an air duct per exhaust duct.
- the outlet of the at least one air duct in an exhaust duct may be surrounded by a second deflector wall.
- the second deflector wall can be arranged around a part of the outlet of the air duct in the exhaust duct, the second deflector wall being able to be turned towards the upstream mouth of the exhaust duct and being able to be suitable hiding said outlet of the air duct in the exhaust duct from the flow of exhaust gas.
- the second deflector wall may include a blister surrounding the part of the outlet of the air duct in the exhaust duct, facing the upstream mouth of the exhaust duct.
- the main chamber may comprise end branches at least partially surrounding cylindrical channels capable of accommodating a coil or an injector.
- each terminal branch may include an orifice, in particular an orifice connected to at least one air duct.
- the main chamber may include at least a first deflector wall capable of effectively orienting the air flow, in particular the air flow coming from the channel towards the at least one air duct, to be conducted in the direction of the upstream mouth of the at least one exhaust duct.
- the main chamber can be arranged in the cylinder head.
- the channel can be provided in the cylinder head.
- At least one air duct can be provided in the cylinder head.
- the end branches can be provided in the cylinder head.
- the invention also relates to a process for obtaining an air intake circuit to the exhaust as defined above, the process for obtaining comprising a foundry step so as to obtain a cylinder head of which a main chamber and / or a channel and / or at least one air duct and / or end branches are produced by molding with the cylinder head.
- the invention also relates to a cylinder head of an air intake circuit to
- the cylinder head comprising a main chamber and / or a channel and / or at least one air duct and / or end branches.
- the invention also relates to an internal combustion engine comprising an air intake circuit to the exhaust as defined above and / or a cylinder head as defined above.
- the invention also relates to a vehicle, in particular a motor vehicle,
- FIG. 1 is a schematic view of a motor vehicle according to one embodiment of the invention.
- Figure 2 is a sectional view of a cylinder head of an air intake circuit to the exhaust, according to a plane extending vertically and transversely, according to one embodiment of the invention.
- Figure 3 is a sectional view of the cylinder head along a horizontal plane, that is to say extending longitudinally and transversely, according to the embodiment of the invention.
- Figure 4 is a sectional view of the cylinder head, along a plane P2 extending vertically wedging and longitudinally, according to the embodiment of the invention.
- Figure 5 is another sectional view of the cylinder head, along plane P2, according to the embodiment of the invention.
- Figure 6 is a sectional view of the cylinder head, along a plane perpendicular to plane P2 and passing through the axis of an air duct, according to the embodiment of the invention.
- Figure 7 is a sectional view of the cylinder head, along a plane PI extending vertically and longitudinally, according to the embodiment of the invention.
- FIG. 1 An example of a vehicle, in particular a motor vehicle 1, according to one embodiment of the invention is illustrated schematically in FIG. 1.
- the vehicle comprises an internal combustion engine 2 according to one embodiment of the invention .
- the vehicle comprises for example a hood separating an engine compartment from an external environment.
- the hood is arranged for example at the front of the vehicle in the case of a powertrain arranged at the front or at the rear in the case of a powertrain arranged at the rear.
- an XYZ trihedron is defined. It is chosen that the direction in which the vehicle usually travels in a straight line is defined as being the longitudinal direction X.
- the direction perpendicular to the longitudinal direction located in a plane parallel to the ground, is called the transverse direction Y.
- the internal combustion engine 2 comprises at least one cylinder 10 of main axis A2, a piston 12 which translates along the main axis A2 within the cylinder 10 and a combustion chamber 11.
- the main axis A2 is parallel or substantially parallel to the vertical direction Z.
- the internal combustion engine 2 further comprises a cylinder head 20.
- the cylinder 10 defines, with the cylinder head 20 and the piston 12, the combustion chamber 11.
- the cylinder head 20 closes the combustion chamber 11 of cylinder 10.
- the internal combustion engine 2 further comprises at least one exhaust duct 26 for conducting a flow of exhaust gas from the combustion chamber 11 of the cylinder 10 to a circuit d 'exhaust.
- the exhaust duct 26 includes an upstream opening 26 '.
- the mouthpiece 26 ′ is controlled by an exhaust valve 3 facing the combustion chamber 11.
- the cylinder head 20 comprises the exhaust duct (s) 26.
- exhaust duct 26 is meant a channel or a cavity formed by preferably in the cylinder head 20, communicating with an exhaust manifold or exhaust circuit (not illustrated), arranged near an exhaust valve 3.
- the exhaust circuit is connected to the cylinder head by an exhaust face of said cylinder head.
- the internal combustion engine 2 further comprises an air intake circuit 30 to the exhaust.
- the air intake circuit to the exhaust 30 comprises a main chamber 22.
- the main chamber 22 extends along a first axis Al or thogonal or substantially orthogonal to the main axis A2 of the cylinder 10.
- Said first axis A1 is preferably parallel, or substantially parallel, to the exhaust face of the cylinder head.
- the main chamber 22 has for example an elongated shape along the first axis A1.
- the average passage section of the main chamber 22, for example circular, has a diameter of between 5 mm and 15 mm, for example of the order of 10 mm.
- the cylinder head 20 comprises the main chamber 22.
- the internal combustion engine 2 can comprise several cylinders 10, preferably in line in the direction of the first axis Al illustrated in Figures 1 and 2.
- the main axes A2, A2 ', A2 ”of the three cylinders extend for example in the same vertical and transverse plane.
- the first axis A1 is then preferably parallel or substantially parallel to the vertical and transverse plane and orthogonal to the main axes A2, A2 ’, A2”.
- the first axis A1 extends parallel or substantially parallel to the transverse direction Y, another direction in a horizontal plane preferably could also be suitable.
- the main chamber 22 is preferably connected, upstream in the direction of air circulation, to a fresh air intake circuit of the internal combustion engine 2. Downstream, the main chamber 22 is connected to at least one exhaust duct 26. For example, as illustrated in FIG. 6, in the case of a three-cylinder in-line engine, two exhaust ducts 26 are provided per cylinder.
- the exhaust air intake circuit 30 comprises a channel 21.
- the channel 21 is connected upstream to the fresh air intake circuit.
- the channel 21 advantageously extends parallel or substantially parallel to the main axis A2 of the cylinder 10.
- the channel 21 preferably opens into the main chamber 22 downstream.
- the cylinder head 20 comprises the channel 21.
- the air intake circuit to the exhaust 30 comprises at least one air duct 23 extending between the main chamber 22 and an exhaust duct 26.
- the air is diffused at the level of the exhaust valve 3 of the exhaust duct 26 concerned.
- an air duct 23 by exhaust duct 26 is planned.
- the air duct 23 has a passage section, for example circular, with a diameter of between 2 mm and 4 mm, for example of the order of 3 mm.
- the length of the air duct 23 is as short as possible.
- the cylinder head 20 comprises the air duct or ducts 23.
- the length of the air duct 23 does not exceed, for example, 60 mm depending on the size or the thickness of the cylinder head 20.
- the cylinder head 20 comprises air ducts 23.
- Each air duct 23 extends between the main chamber 22 and an exhaust duct 26, by example near an intake duct of an intake valve (not shown).
- main 22 comprises at least a first deflector wall 24 capable of effectively directing the air flow coming from the channel 21 towards an air duct 23.
- first deflector wall 24 can be formed by a curvature of the main chamber 22 with a radius, of the order of 30 mm for example, to prevent recirculation of the intake air as well as overspeeds of the air flow. resulting in pressure drops.
- These first deflector walls 24 are, for example, concave and / or convex walls, preferably provided with rounded shapes free from sharp edges or protrusions.
- Such walls 24 make it possible to effectively orient the air flow (illustrated with arrows), within the main chamber 22, towards the air ducts 23.
- the flow of fresh air enters the main chamber. 22 via the channel 21 at an inlet 2G and is discharged through orifices or openings 23 'of the air ducts 23.
- the main chamber 22 comprises end branches 29 as illustrated in Figure 3.
- these end branches 29 surround, at least partially, cylindrical channels 27, 28 suitable for housing a coil or an injector as illustrated in Figure 7.
- the arrangement of the main chamber 22 between the cylindrical channels, or injection wells, and other cylindrical channels, or coil wells, advantageously enables the cylinder head 20 to be made more compact and optimize the mass of the cylinder head 20.
- each terminal branch 29 preferably comprises an orifice 23 ′ connected to the air duct 23.
- the outlet of the air duct 23 in the adjacent exhaust duct 26 is surrounded by a second deflector wall 24 '.
- the second deflector wall 24 ' is arranged around only part of the outlet of the air duct 23 in the exhaust duct 26.
- the second deflector wall 24' is then turned towards the upstream mouth 26 'of the exhaust duct 26.
- the second deflector wall 24 ' is able to hide the outlet of the air duct 23 in the exhaust duct 26 from the flow of exhaust gas.
- the second deflector wall 24 ' comprises a blister surrounding the part of the outlet of the air duct 23 in the exhaust duct 26. This blister is for example turned towards the upstream mouth 26' of the exhaust duct 26.
- this shape comprises a rounding, or chamfer, making it possible to avoid having a bevelled part at the level of the air duct 23 opening up in the exhaust duct 26 at the level of the head 3 'of the exhaust valve 3
- an arrangement of a deflecting form 24 'at the outlet of each air duct 23 makes it possible to limit or even avoid the reflux of burnt gases into the adjacent air duct 23.
- a valve can be arranged within the air intake circuit to
- the main chamber 22 is formed in the cylinder head 20.
- the channel 21 is formed in the cylinder head 20.
- the at least one air duct 23 is formed in the cylinder head.
- the end branches 29 are formed in the yoke 20.
- the method comprises a foundry step so as to obtain the cylinder head 20 including the main chamber 22 and / or the channel 21 and / or at least one air duct 23 and / or the end branches 29 are produced by molding with the cylinder head 20.
- the main chamber 22 and / or the channel 21 and / or at least one air duct 23 and / or the end branches 29 are for example formed by G use of one or more cores during the foundry process used to obtain the cylinder head 20.
- the method comprises a machining step for obtaining the channel 21 and / or the air duct (s) 23 and / or the second deflector wall (s) 24 ’.
- the cylinder head 20 of the air intake circuit to the exhaust 30 preferably comprises the main chamber 22 and / or the channel 21 and / or at least one air duct 23 and / or the terminal branches 29.
- exhaust 26 Preferably, an air duct 23 is provided by exhaust duct 26.
- the same cylinder of the internal combustion engine 2 comprises for example two exhaust valves 3.
- six air ducts 23 are provided.
- the same cylinder can have two valves
- a cylinder may have only one exhaust valve or may have three or more exhaust valves.
- the fresh air arrives in the channel 21 at the upper level, for example of the cylinder head 20.
- the fresh air enters the cylinder head 20 and arrives within the main chamber 22.
- the first deflector walls 24 of the main chamber 22 ensure a flow minimizing turbulence and pressure losses towards the air ducts 23.
- the fresh air arrives at the inlet or upstream mouth 26 'of each exhaust duct 26 after having passed through the ducts. air 23.
- the ends downstream of the air ducts 23 are arranged at the level of the heads 3 'of the exhaust valves 3, for example above each valve head.
- each exhaust duct 26 in other words a "station to station” air distribution.
- This is partly due to the specific shapes, in particular within the main chamber 22, favoring the flow of the flow of fresh air so as to obtain an excellent compromise between pressure drop / homogeneity of the distribution.
- the exhaust ducts 26, the shapes of the chambers, ducts, channels are particularly suited to facilitate the flow of fresh air.
- This circuit at the top of the engine preferably comprising a channel 21, a main chamber 22, air ducts 23 integrated in the cylinder head 20, is particularly compact.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1900609A FR3092139B1 (fr) | 2019-01-24 | 2019-01-24 | Circuit d’admission d’air à l’échappement d’un moteur à combustion interne. |
| PCT/EP2020/051620 WO2020152265A1 (fr) | 2019-01-24 | 2020-01-23 | Circuit d'admission d'air à l'échappement d'un moteur à combustion interne |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3914814A1 true EP3914814A1 (fr) | 2021-12-01 |
Family
ID=67185219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20701191.7A Pending EP3914814A1 (fr) | 2019-01-24 | 2020-01-23 | Circuit d'admission d'air à l'échappement d'un moteur à combustion interne |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3914814A1 (fr) |
| FR (1) | FR3092139B1 (fr) |
| WO (1) | WO2020152265A1 (fr) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160281634A1 (en) * | 2015-03-25 | 2016-09-29 | Toyota Jidosha Kabushiki Kaisha | Cylinder head and internal combustion engine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3934883A1 (de) * | 1989-10-19 | 1991-04-25 | Bayerische Motoren Werke Ag | Brennkraftmaschine mit einer einblasevorrichtung in einen gaswechselkanal, insbesondere zum lufteinblasen in einen abgaskanal |
| JP3875417B2 (ja) * | 1998-11-25 | 2007-01-31 | 本田技研工業株式会社 | 車両用エンジンにおける燃料噴射装置 |
| FR2893081A3 (fr) * | 2005-11-10 | 2007-05-11 | Renault Sas | Siege de soupape comportant une buse d'injection, moteur comportant ce siege et procede d'injection d'air a l'echappement |
| WO2010020286A1 (fr) * | 2008-08-21 | 2010-02-25 | Fev Motorentechnik Gmbh | Moteur à combustion interne à plusieurs cylindres |
-
2019
- 2019-01-24 FR FR1900609A patent/FR3092139B1/fr active Active
-
2020
- 2020-01-23 WO PCT/EP2020/051620 patent/WO2020152265A1/fr not_active Ceased
- 2020-01-23 EP EP20701191.7A patent/EP3914814A1/fr active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160281634A1 (en) * | 2015-03-25 | 2016-09-29 | Toyota Jidosha Kabushiki Kaisha | Cylinder head and internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020152265A1 (fr) | 2020-07-30 |
| FR3092139A1 (fr) | 2020-07-31 |
| FR3092139B1 (fr) | 2023-11-10 |
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