WO2008046987A2 - Exhaust gases recirculation device for an internal combustion engine - Google Patents
Exhaust gases recirculation device for an internal combustion engine Download PDFInfo
- Publication number
- WO2008046987A2 WO2008046987A2 PCT/FR2007/001664 FR2007001664W WO2008046987A2 WO 2008046987 A2 WO2008046987 A2 WO 2008046987A2 FR 2007001664 W FR2007001664 W FR 2007001664W WO 2008046987 A2 WO2008046987 A2 WO 2008046987A2
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- WO
- WIPO (PCT)
- Prior art keywords
- intake manifold
- recirculation
- duct
- wall
- intake
- Prior art date
Links
- 239000007789 gas Substances 0.000 title claims abstract description 52
- 238000002485 combustion reaction Methods 0.000 title claims description 6
- 238000002156 mixing Methods 0.000 claims abstract description 66
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 10
- 230000004888 barrier function Effects 0.000 claims abstract description 5
- 230000003134 recirculating effect Effects 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 6
- 210000000078 claw Anatomy 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
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- 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10314—Materials for intake systems
- F02M35/10321—Plastics; Composites; Rubbers
-
- 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction 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
- F02M26/17—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
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- 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
- F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
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- 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10262—Flow guides, obstructions, deflectors or the like
-
- 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
- F02M26/18—Thermal insulation or heat protection
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- 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
- the present invention relates to an exhaust gas recirculation device ("EGR") of an internal combustion engine, such as a motor vehicle engine, of the type comprising an exhaust gas recirculation line in connection with an intake manifold duct arranged upstream of an intake manifold, the manifold duct and the distributor being made of plastic.
- EGR exhaust gas recirculation device
- Such a device aims to reduce polluting emissions by recycling the exhaust gases in the engine intake cylinders to different engine operating phases (depending on the engine speed which determines the suction frequency, and the load engine that determines the quantities to suck).
- These gases introduced downstream of a throttle body for gasoline engines and downstream of a dosing unit for diesel engines must be evenly distributed in each cylinder because each cylinder must receive the same amount of air and gas exhaust than neighboring cylinders.
- the two streams (exhaust gas and air) have different trajectories inside the distributor because of the geometric shape of the distributor, the valve opening frequency (pressure wave problem), and the fact that that the two gases (air and exhaust gas) are in different temperature and speed conditions at the inlet of the distributor.
- the suction of the same amount of exhaust gas and air in each cylinder is rarely achieved in all phases where it is necessary to introduce exhaust gas.
- the exhaust gases should be injected far upstream of the distributor inlet in order to have a sufficiently long path for the flow of gases exhaust and thus allow homogenization of the gas mixture by turbulent diffusion;
- the collector duct and the distributor being made of plastic, it is necessary to prevent the hot exhaust gases (about 80 to 400 c C) abut against their walls on the one hand so that they do not melt and d on the other hand, to prevent the flow of exhaust gas from "adhering" to and adhering to these walls, which would reduce the exchange surface (and hence the mixing) with the intake air flow .
- the present invention aims at avoiding these drawbacks by proposing an exhaust gas recirculation device which makes it possible to mix the exhaust gases and the intake air efficiently in a reduced volume (in particular in length) while avoiding that the exhaust gases "adhere" to the walls of the distributor and the collector duct, while minimizing the pressure drop.
- the subject of the invention is a device for recirculating the exhaust gases of an internal combustion engine, of the type essentially comprising an exhaust gas recirculation duct in connection with an intake manifold duct. air arranged upstream (relative to the intake air flow) of an intake distributor, and in which the recirculation duct is oriented along an axis substantially perpendicular and radially offset with respect to a central longitudinal axis of the duct intake manifold, and comprises a tubular shaped mixing nozzle taking place in the intake manifold duct and whose section is concentric with that of the intake manifold duct, so as to
- the idea underlying the invention is to provide, for the recirculation pipe, a tubular mixing nozzle which takes place in the intake manifold duct.
- the arrival of the exhaust gas in this mixing nozzle is parallel to a tangent of the circular profile of the mixing nozzle, and the exhaust gas is vortexed along the inner wall of the mixing nozzle. This makes it possible to lengthen the path of the flow of the exhaust gases without encountering any obstacle.
- the gas flow keeps its inertia and continues to swirl inside the air flow.
- the mixing tip creates very little pressure drop on the airflow since it is placed in the direction of flow.
- the collector duct and the distributor can easily be made of plastic, thanks to the thermal barrier formed by the air flow between the walls of the inlet manifold duct and the mixing nozzle.
- the inner diameter of the recirculation pipe is for example about one third of the inner diameter of the intake manifold.
- the inner diameter of the mixing tip is for example about 5/2 of the inner diameter of the recirculation line.
- the length of the mixing nozzle is for example less than or substantially equivalent to the internal diameter of the intake manifold duct.
- a downstream end of the mixing nozzle has an annular chamfer directed inwards, in particular inclined at an angle of about 30 °, in order to accelerate the displacement of the exhaust gas mixture and intake air at the outlet of the mixing tip.
- the inner diameter of the annular chamfer at the downstream end of the mixing tip is for example about twice the internal diameter of the recirculation line.
- an end section of the recirculation duct opening into the mixing nozzle has a downstream wall projecting radially inside the mixing nozzle.
- This stretch The end of the recirculation line has, for example, a downstream beveled edge upstream.
- the mixing tip has at least three centering fins, in particular resilient fins distributed over its outer wall in order to keep the mixing tip centered on the inner wall of the intake duct.
- the centering fins advantageously have claws fastening to the inner wall of the intake manifold duct.
- the centering fins are slightly inclined at the same angle relative to the central longitudinal axis of the intake manifold duct, so as to cause the second part of the intake air flow, which passes through said annular passage between the walls of the mixing tip and the intake manifold duct, forward along a helical path centered on the central longitudinal axis of the intake manifold duct.
- This air entrainment in a light “whirlpool” improves the mixing of the air with the exhaust.
- An outer wall of the recirculation pipe is advantageously be sealingly connected to an outer wall of the intake manifold duct by means of an annular fixing skirt, in particular made of sheet metal.
- FIG. 1 is a schematic overview of an exhaust gas recirculation device according to the state of the art
- FIG. 2 is a diagrammatic cross-sectional view of a connection zone between an intake air intake duct and a recirculation duct of a device according to the invention
- FIG. 3 is a diagrammatic view in longitudinal section of the connection zone illustrated in FIG. 2;
- - Figure 4 is a perspective view of an embodiment of a mixing nozzle for a recirculation pipe of said device;
- FIG. 5 is a perspective view, from upstream to downstream, of a recirculation device comprising the mixing tip of FIG. 4.
- the exhaust gases 6 of an internal combustion engine of a motor vehicle are taken from a collector. exhaust (not shown) by a pipe 4 which recirculates in a duct intake air intake 3 of the engine downstream (relative to the flow of intake air) of an air intake flap 2 and upstream of an intake manifold 1.
- the manifold duct 3 and the intake manifold 1 are made of plastic, but they could be made of any other material (e.g. aluminum or magnesium).
- the invention provides, as shown in particular in Figure 2, that the recirculation pipe 4 is oriented along a substantially perpendicular axis and radially offset from a central longitudinal axis of the intake manifold duct 3.
- the recirculation line 4 comprises at its end a mixing nozzle 7 of tubular shape taking place in the intake manifold duct 3 and whose circular section is concentric with that of the intake manifold duct 3.
- the arrival of the exhaust gas 6 in the mixing nozzle 7 is thus parallel to a tangent of the circular profile of the mixing nozzle 7, and the exhaust gas 6 is driven forward on the inner wall of the mixing tip 7 in a helical path centered on the central longitudinal axis of the intake manifold duct 3. This allows to lengthen the path of the exhaust gas stream 6 without encountering obstacle on the path.
- the exhaust gas 6 mixes with a first part of the air flow 5 which passes through the mixing nozzle 7, while a second part of the air flow 5 passes through an annular passage formed between the outer wall of the mixing tip 7 and the inner wall of the intake manifold duct 3 and thus provides a thermal barrier between the intake manifold duct 3
- the mixing tip 7 has three resilient centering fins 9 distributed on its outer wall in order to hold the mixing tip 7 on the inner wall of the intake manifold duct 3.
- An end section of the recirculation pipe 4, which opens into the mixing tip 7, has a downstream beveled flange 4a upstream (better visible in Figure 3) to form an obstacle to the flow of air downstream to the This arrangement improves the mixing at low exhaust flow rates 6 while preserving, or even improving, the "helical" drive effect, at high flow rate.
- the outer wall of the recirculation pipe 4 is sealingly connected to the outer wall of the intake manifold pipe 3 by means of an annular fixing skirt 8 made of steel sheet.
- the inside diameter of the recirculation pipe 4 is about one third of the inside diameter D of the intake manifold duct 3, and the inner diameter D1 of the mixing nozzle 7 is about 5/2 of the inside diameter of the recirculation pipe 4 (see Figure 3).
- the length of the mixing nozzle 7 is substantially equivalent to the inside diameter D of the intake manifold duct 3.
- a downstream end of the mixing tip 7 has an inwardly projecting annular chamfer 7a, inclined at an angle of about 30 ° of the chamfer 7a, to accelerate the movement of the exhaust gas mixture 6 and intake air 5 at the outlet of the mixing nozzle 7.
- This increase in speed makes it possible to increase the swirling zone at the outlet of the mixing tip 7 where mixing is done.
- the angle of inclination of approximately 30 ° makes it possible to limit the pressure drops at this downstream end.
- the inside diameter D2 of the annular chamfer 7a is approximately twice the inside diameter of the recirculation pipe 4.
- This annular chamfer 7a also makes it possible to obstruct the exit of the exhaust gases 6 in the direction of the air flow, and to obtain an exhaust gas flow 6 opposite to the larger air flow, towards the inlet of the mixing tip 7, which improves the mixing for low exhaust gas flow rates.
- the centering fins 9 are formed of folded sheets, welded to the outer wall of the mixing nozzle 7 made of steel.
- the fins 9 are received in corresponding housings provided on the inner wall of the inlet manifold duct 3. These fins 9 have attachment claws 9a to better grip the plastic inner wall of the intake manifold duct 3.
- a light 7b is provided in the wall of the mixing nozzle 7 to receive the end section of the recirculation pipe 4.
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- 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
Dispositif de recirculation des gaz d'échappement d'un moteur à combustion interne Exhaust gas recirculation device of an internal combustion engine
La présente invention concerne un dispositif de recirculation des gaz d'échappement (dit "EGR") d'un moteur à combustion interne, tel qu'un moteur de véhicule automobile, du type comprenant une conduite de recirculation des gaz d'échappement en liaison avec un conduit collecteur d'admission d'air disposé en amont d'un répartiteur d'admission, le conduit collecteur et le répartiteur étant réalisés en matière plastique. Un tel dispositif vise à réduire les émissions polluantes en recyclant les gaz d'échappement dans les cylindres d'admission du moteur à différentes phases de fonctionnement du moteur (en fonction du régime du moteur qui détermine la fréquence d'aspiration, et de la charge du moteur qui détermine les quantités à aspirer). Ces gaz introduits en aval d'un boîtier papillon pour les moteurs à essence et en aval d'un boîtier doseur pour les moteurs diesel doivent se répartir de façon homogène dans chaque cylindre car chaque cylindre doit recevoir la même quantité d'air et de gaz d'échappement que les cylindres voisins. Les deux flux (gaz d'échappement et air) ont des trajectoires différentes à l'intérieur du répartiteur du fait de la forme géométrique du répartiteur, de la fréquence d'ouverture des soupapes (problème d'onde de pression), et du fait que les deux gaz (air et gaz d'échappement) sont dans des conditions de température et de vitesses différentes à l'entrée du répartiteur. L'aspiration d'une même quantité de gaz d'échappement et d'air dans chaque cylindre est rarement atteinte dans toutes les phases où l'on doit introduire des gaz d'échappement.The present invention relates to an exhaust gas recirculation device ("EGR") of an internal combustion engine, such as a motor vehicle engine, of the type comprising an exhaust gas recirculation line in connection with an intake manifold duct arranged upstream of an intake manifold, the manifold duct and the distributor being made of plastic. Such a device aims to reduce polluting emissions by recycling the exhaust gases in the engine intake cylinders to different engine operating phases (depending on the engine speed which determines the suction frequency, and the load engine that determines the quantities to suck). These gases introduced downstream of a throttle body for gasoline engines and downstream of a dosing unit for diesel engines must be evenly distributed in each cylinder because each cylinder must receive the same amount of air and gas exhaust than neighboring cylinders. The two streams (exhaust gas and air) have different trajectories inside the distributor because of the geometric shape of the distributor, the valve opening frequency (pressure wave problem), and the fact that that the two gases (air and exhaust gas) are in different temperature and speed conditions at the inlet of the distributor. The suction of the same amount of exhaust gas and air in each cylinder is rarely achieved in all phases where it is necessary to introduce exhaust gas.
Une idée simple pour obtenir une bonne répartition de gaz d'échappement et d'air consiste à en réaliser un mélange homogène avant l'entrée dans le répartiteur. Les gaz d'échappement et l'air formant un même flux gazeux auront alors la même trajectoire.A simple idea to obtain a good distribution of exhaust and air is to achieve a homogeneous mixture before entering the tundish. The exhaust gases and the air forming the same gas flow will then have the same trajectory.
Cette idée, simple en théorie, n'est pas facile à mettre en oeuvre pour les raisons suivantes :This idea, simple in theory, is not easy to implement for the following reasons:
- il faudrait injecter les gaz d'échappement loin en amont de l'entrée du répartiteur pour avoir un trajet suffisamment long du flux des gaz d'échappement et permettre ainsi une homogénéisation du mélange gazeux par diffusion turbulente;- the exhaust gases should be injected far upstream of the distributor inlet in order to have a sufficiently long path for the flow of gases exhaust and thus allow homogenization of the gas mixture by turbulent diffusion;
- l'emploi d'obstacles pour contribuer au mélange est proscrit car cela pourrait générer des pertes de charge pour les gaz d'échappement et pour l'air (un obstacle égaliserait les vitesses des deux flux qui se mélangeraient peu);- the use of obstacles to contribute to the mixture is prohibited because it could generate pressure drops for the exhaust gases and for the air (an obstacle would equalize the speeds of the two flows that would mix little);
- le conduit collecteur et le répartiteur étant réalisés en matière plastique, il faut éviter que les gaz d'échappement chauds (environ 80 à 400cC) viennent buter contre leurs parois d'une part pour que ceux-ci ne fondent pas et d'autre part pour éviter que le flux de gaz d'échappement longe et "adhère" à ces parois et y « adhère », ce qui réduirait la surface d'échange (et donc le mélange) avec le flux d'air d'admission.- The collector duct and the distributor being made of plastic, it is necessary to prevent the hot exhaust gases (about 80 to 400 c C) abut against their walls on the one hand so that they do not melt and d on the other hand, to prevent the flow of exhaust gas from "adhering" to and adhering to these walls, which would reduce the exchange surface (and hence the mixing) with the intake air flow .
La présente invention vise à éviter ces inconvénients en proposant un dispositif de recirculation de gaz d'échappement qui permette de mélanger les gaz d'échappement et l'air d'admission de façon efficace dans un volume réduit (en particulier en longueur) en évitant que les gaz d'échappement "adhèrent" aux parois du répartiteur et du conduit collecteur, tout en minimisant la perte de charge.The present invention aims at avoiding these drawbacks by proposing an exhaust gas recirculation device which makes it possible to mix the exhaust gases and the intake air efficiently in a reduced volume (in particular in length) while avoiding that the exhaust gases "adhere" to the walls of the distributor and the collector duct, while minimizing the pressure drop.
A cet effet, l'invention a pour objet un dispositif de recirculation des gaz d'échappement d'un moteur à combustion interne, du type comprenant essentiellement une conduite de recirculation des gaz d'échappement en liaison avec un conduit collecteur d'admission d'air disposé en amont (relativement au flux d'air d'admission) d'un répartiteur d'admission, et dans lequel la conduite de recirculation est orientée selon un axe sensiblement perpendiculaire et radialement décalé par rapport à un axe longitudinal central du conduit collecteur d'admission, et comporte un embout mélangeur de forme tubulaire prenant place dans le conduit collecteur d'admission et dont la section est concentrique avec celle du conduit collecteur d'admission, de manière àFor this purpose, the subject of the invention is a device for recirculating the exhaust gases of an internal combustion engine, of the type essentially comprising an exhaust gas recirculation duct in connection with an intake manifold duct. air arranged upstream (relative to the intake air flow) of an intake distributor, and in which the recirculation duct is oriented along an axis substantially perpendicular and radially offset with respect to a central longitudinal axis of the duct intake manifold, and comprises a tubular shaped mixing nozzle taking place in the intake manifold duct and whose section is concentric with that of the intake manifold duct, so as to
- entraîner les gaz d'échappement en avant selon une trajectoire hélicoïdale centrée sur l'axe longitudinal central du conduit collecteur d'admission, en vue de mélanger ces gaz d'échappement avec une première partie du flux d'air d'admission qui traverse l'embout mélangeur tubulaire, et- driving the exhaust gases forward along a helical path centered on the central longitudinal axis of the intake manifold duct, with a view to mixing these exhaust gases with a first part of the intake air flow which passes through the tubular mixing nozzle, and
- former un passage annulaire entre une paroi externe de l'embout mélangeur tubulaire et une paroi interne du conduit collecteur d'admission, de sorte qu'une seconde partie du flux d'air d'admission traverse ce passage annulaire et réalise ainsi une barrière thermique entre le conduit collecteur d'admission et l'embout mélangeur.forming an annular passage between an outer wall of the tubular mixing nozzle and an inner wall of the intake manifold duct, so that a second portion of the intake air flow passes through this passage annular and thus achieves a thermal barrier between the intake manifold duct and the mixing nozzle.
Ainsi, l'idée à la base de l'invention consiste à prévoir, pour la conduite de recirculation, un embout mélangeur tubulaire qui prend place dans le conduit collecteur d'admission.Thus, the idea underlying the invention is to provide, for the recirculation pipe, a tubular mixing nozzle which takes place in the intake manifold duct.
L'arrivée des gaz d'échappement dans cet embout mélangeur se fait parallèlement à une tangente du profil circulaire de l'embout mélangeur, puis les gaz d'échappement sont entraînés en tourbillon le long de la paroi interne de l'embout mélangeur. Ceci permet d'allonger le trajet de l'écoulement des gaz d'échappement sans qu'il ne rencontre d'obstacle. En sortie de l'embout mélangeur, le flux gazeux garde son inertie et continue à tourbillonner à l'intérieur de l'écoulement d'air.The arrival of the exhaust gas in this mixing nozzle is parallel to a tangent of the circular profile of the mixing nozzle, and the exhaust gas is vortexed along the inner wall of the mixing nozzle. This makes it possible to lengthen the path of the flow of the exhaust gases without encountering any obstacle. At the outlet of the mixing nozzle, the gas flow keeps its inertia and continues to swirl inside the air flow.
L'embout mélangeur crée très peu de pertes de charge sur l'écoulement d'air puisqu'il est placé dans le sens de l'écoulement. Le conduit collecteur et le répartiteur peuvent sans problème être réalisés en matière plastique, grâce à la barrière thermique formée par le flux d'air entre les parois du conduit collecteur d'admission et de l'embout mélangeur.The mixing tip creates very little pressure drop on the airflow since it is placed in the direction of flow. The collector duct and the distributor can easily be made of plastic, thanks to the thermal barrier formed by the air flow between the walls of the inlet manifold duct and the mixing nozzle.
Le diamètre intérieur de la conduite de recirculation représente par exemple environ un tiers du diamètre intérieur du conduit collecteur d'admission.The inner diameter of the recirculation pipe is for example about one third of the inner diameter of the intake manifold.
Le diamètre intérieur de l'embout mélangeur représente par exemple environ 5/2 du diamètre intérieur de la conduite de recirculation. La longueur de l'embout mélangeur est par exemple inférieure ou sensiblement équivalente au diamètre intérieur du conduit collecteur d'admission.The inner diameter of the mixing tip is for example about 5/2 of the inner diameter of the recirculation line. The length of the mixing nozzle is for example less than or substantially equivalent to the internal diameter of the intake manifold duct.
Selon une possibilité, une extrémité aval de l'embout mélangeur présente un chanfrein annulaire dirigé vers l'intérieur, notamment incliné d'un angle d'environ 30°, en vue d'accélérer le déplacement du mélange de gaz d'échappement et d'air d'admission à la sortie de l'embout mélangeur. Le diamètre intérieur du chanfrein annulaire à l'extrémité aval de l'embout mélangeur représente par exemple environ deux fois le diamètre intérieur de la conduite de recirculation.According to one possibility, a downstream end of the mixing nozzle has an annular chamfer directed inwards, in particular inclined at an angle of about 30 °, in order to accelerate the displacement of the exhaust gas mixture and intake air at the outlet of the mixing tip. The inner diameter of the annular chamfer at the downstream end of the mixing tip is for example about twice the internal diameter of the recirculation line.
Selon une possibilité avantageuse, un tronçon terminal de la conduite de recirculation débouchant dans l'embout mélangeur présente une paroi aval saillante radialement à l'intérieur de l'embout mélangeur. Ce tronçon terminal de la conduite de recirculation présente par exemple un rebord biseauté d'aval en amont.According to an advantageous possibility, an end section of the recirculation duct opening into the mixing nozzle has a downstream wall projecting radially inside the mixing nozzle. This stretch The end of the recirculation line has, for example, a downstream beveled edge upstream.
Dans une forme de réalisation, l'embout mélangeur présente au moins trois ailettes de centrage, notamment des ailettes élastiques, réparties sur sa paroi externe afin de maintenir l'embout mélangeur centré sur la paroi interne du conduit d'admission. Les ailettes de centrage présentent avantageusement des griffes de fixation à la paroi interne du conduit collecteur d'admission.In one embodiment, the mixing tip has at least three centering fins, in particular resilient fins distributed over its outer wall in order to keep the mixing tip centered on the inner wall of the intake duct. The centering fins advantageously have claws fastening to the inner wall of the intake manifold duct.
De manière avantageuse, les ailettes de centrage sont légèrement inclinées d'un même angle par rapport à l'axe longitudinal central du conduit collecteur d'admission, de manière à entraîner la seconde partie du flux d'air d'admission, qui traverse ledit passage annulaire entre les parois de l'embout mélangeur et du conduit collecteur d'admission, en avant selon une trajectoire hélicoïdale centrée sur l'axe longitudinal central du conduit collecteur d'admission. Cet entraînement de l'air en un léger "tourbillon" permet d'améliorer le mélange de l'air avec les gaz d'échappement.Advantageously, the centering fins are slightly inclined at the same angle relative to the central longitudinal axis of the intake manifold duct, so as to cause the second part of the intake air flow, which passes through said annular passage between the walls of the mixing tip and the intake manifold duct, forward along a helical path centered on the central longitudinal axis of the intake manifold duct. This air entrainment in a light "whirlpool" improves the mixing of the air with the exhaust.
Une paroi extérieure de la conduite de recirculation est avantageusement être liée de manière étanche à une paroi extérieure du conduit collecteur d'admission par l'intermédiaire d'une jupe annulaire de fixation notamment réalisée en tôle.An outer wall of the recirculation pipe is advantageously be sealingly connected to an outer wall of the intake manifold duct by means of an annular fixing skirt, in particular made of sheet metal.
La mise en œuvre de l'invention sera mieux comprise à la l'aide de la description détaillée qui suit se référant au dessin annexé dans lequel :The implementation of the invention will be better understood with the aid of the detailed description which follows with reference to the appended drawing in which:
- la figure 1 est une vue d'ensemble schématique d'un dispositif de recirculation de gaz d'échappement selon l'état de la technique; - la figure 2 est une vue schématique en coupe transversale d'une zone de liaison entre un conduit collecteur d'admission d'air et une conduite de recirculation d'un dispositif conforme à l'invention ;- Figure 1 is a schematic overview of an exhaust gas recirculation device according to the state of the art; FIG. 2 is a diagrammatic cross-sectional view of a connection zone between an intake air intake duct and a recirculation duct of a device according to the invention;
- la figure 3 est une vue schématique en coupe longitudinale de la zone de liaison illustrée sur la figure 2; - la figure 4 est une vue en perspective d'un exemple de réalisation d'un embout mélangeur pour une conduite de recirculation dudit dispositif;FIG. 3 is a diagrammatic view in longitudinal section of the connection zone illustrated in FIG. 2; - Figure 4 is a perspective view of an embodiment of a mixing nozzle for a recirculation pipe of said device;
- la figure 5 est une vue en perspective, d'amont vers l'aval, d'un d'un dispositif de recirculation comprenant l'embout mélangeur de la figure 4.FIG. 5 is a perspective view, from upstream to downstream, of a recirculation device comprising the mixing tip of FIG. 4.
Dans le dispositif de recirculation de gaz d'échappement schématisé sur la figure 1 , les gaz d'échappement 6 d'un moteur à combustion interne de véhicule automobile sont prélevés dans un collecteur d'échappement (non représenté) par une conduite 4 qui les recircule dans un conduit collecteur d'admission d'air 3 du moteur en aval (relativement au flux d'air d'admission) d'un volet d'admission d'air 2 et en amont d'un répartiteur d'admission 1. Dans le cas ici ici considéré, le conduit collecteur 3 et le répartiteur d'admission 1 sont réalisés en matière plastique, mais ils pourraient être réalisés en tout autre matériau (par ex. aluminium ou magnésium).In the exhaust gas recirculation device shown diagrammatically in FIG. 1, the exhaust gases 6 of an internal combustion engine of a motor vehicle are taken from a collector. exhaust (not shown) by a pipe 4 which recirculates in a duct intake air intake 3 of the engine downstream (relative to the flow of intake air) of an air intake flap 2 and upstream of an intake manifold 1. In the case here considered, the manifold duct 3 and the intake manifold 1 are made of plastic, but they could be made of any other material (e.g. aluminum or magnesium).
Pour améliorer le mélange des gaz d'échappement 6 et de l'air 5 admis par le volet 2, l'invention prévoit, comme le montre en particulier la figure 2, que la conduite de recirculation 4 est orientée selon un axe sensiblement perpendiculaire et radialement décalé par rapport à un axe longitudinal central du conduit collecteur d'admission 3.To improve the mixing of the exhaust gases 6 and the air admitted by the flap 2, the invention provides, as shown in particular in Figure 2, that the recirculation pipe 4 is oriented along a substantially perpendicular axis and radially offset from a central longitudinal axis of the intake manifold duct 3.
La conduite de recirculation 4 comporte à son extrémité un embout mélangeur 7 de forme tubulaire prenant place dans le conduit collecteur d'admission 3 et dont la section circulaire est concentrique avec celle du conduit collecteur d'admission 3.The recirculation line 4 comprises at its end a mixing nozzle 7 of tubular shape taking place in the intake manifold duct 3 and whose circular section is concentric with that of the intake manifold duct 3.
L'arrivée des gaz d'échappement 6 dans l'embout mélangeur 7 se fait ainsi parallèlement à une tangente du profil circulaire de l'embout mélangeur 7, puis les gaz d'échappement 6 sont entraînés en avant sur la paroi interne de l'embout mélangeur 7 selon une trajectoire hélicoïdale centrée sur l'axe longitudinal central du conduit collecteur d'admission 3. Ceci permet d'allonger le trajet du flux de gaz d'échappement 6 sans qu'il ne rencontre d'obstacle sur trajet.The arrival of the exhaust gas 6 in the mixing nozzle 7 is thus parallel to a tangent of the circular profile of the mixing nozzle 7, and the exhaust gas 6 is driven forward on the inner wall of the mixing tip 7 in a helical path centered on the central longitudinal axis of the intake manifold duct 3. This allows to lengthen the path of the exhaust gas stream 6 without encountering obstacle on the path.
Les gaz d'échappement 6 se mélangent avec une première partie du flux d'air 5 qui traverse l'embout mélangeur 7, tandis qu'une seconde partie du flux d'air 5 traverse un passage annulaire formé entre la paroi externe de l'embout mélangeur 7 et la paroi interne du conduit collecteur d'admission 3 et réalise ainsi une barrière thermique entre le conduit collecteur d'admission 3The exhaust gas 6 mixes with a first part of the air flow 5 which passes through the mixing nozzle 7, while a second part of the air flow 5 passes through an annular passage formed between the outer wall of the mixing tip 7 and the inner wall of the intake manifold duct 3 and thus provides a thermal barrier between the intake manifold duct 3
(en matière plastique) et l'embout mélangeur 7 (chaud). A la sortie de l'embout mélangeur 7, le flux de gaz d'échappement(plastic) and the mixing tip 7 (hot). At the outlet of the mixing nozzle 7, the flow of exhaust gas
6 garde son inertie et continue à tourbillonner à l'intérieur de l'écoulement d'air6 keeps its inertia and continues to swirl inside the airflow
5.5.
Comme le montre la figure 4, l'embout mélangeur 7 présente trois ailettes de centrage 9 élastiques réparties sur sa paroi externe afin de maintenir l'embout mélangeur 7 sur la paroi interne du conduit collecteur d'admission 3. Un tronçon terminal de la conduite de recirculation 4, qui débouche dans l'embout mélangeur 7, présente un rebord 4a biseauté d'aval en amont (mieux visible sur la figure 3) pour former un obstacle au flux d'air en aval à l'intérieur de l'embout mélangeur 7. Cette disposition améliore le mélange aux faibles débits de gaz d'échappement 6 tout en préservant, voire en améliorant, l'effet d'entraînement "hélicoïdal", à débit élevé.As shown in FIG. 4, the mixing tip 7 has three resilient centering fins 9 distributed on its outer wall in order to hold the mixing tip 7 on the inner wall of the intake manifold duct 3. An end section of the recirculation pipe 4, which opens into the mixing tip 7, has a downstream beveled flange 4a upstream (better visible in Figure 3) to form an obstacle to the flow of air downstream to the This arrangement improves the mixing at low exhaust flow rates 6 while preserving, or even improving, the "helical" drive effect, at high flow rate.
La paroi extérieure de la conduite de recirculation 4 est liée de manière étanche à la paroi extérieure du conduit collecteur d'admission 3 par l'intermédiaire d'une jupe annulaire de fixation 8 réalisable en tôle d'acier. Le diamètre intérieur de la conduite de recirculation 4 représente environ un tiers du diamètre intérieur D du conduit collecteur d'admission 3, et le diamètre intérieur D1 de l'embout mélangeur 7 représente environ 5/2 du diamètre intérieur de la conduite de recirculation 4 (voir figure 3).The outer wall of the recirculation pipe 4 is sealingly connected to the outer wall of the intake manifold pipe 3 by means of an annular fixing skirt 8 made of steel sheet. The inside diameter of the recirculation pipe 4 is about one third of the inside diameter D of the intake manifold duct 3, and the inner diameter D1 of the mixing nozzle 7 is about 5/2 of the inside diameter of the recirculation pipe 4 (see Figure 3).
La longueur de l'embout mélangeur 7 est sensiblement équivalente au diamètre intérieur D du conduit collecteur d'admission 3.The length of the mixing nozzle 7 is substantially equivalent to the inside diameter D of the intake manifold duct 3.
Une extrémité aval de l'embout mélangeur 7 présente un chanfrein annulaire 7a saillant vers l'intérieur, incliné d'un angle d'environ 30°du chanfrein 7a, en vue d'accélérer le déplacement du mélange de gaz d'échappement 6 et d'air d'admission 5 en sortie de l'embout mélangeur 7. Cette augmentation de vitesse permet d'accroître la zone tourbillonnaire en sortie de l'embout mélangeur 7 où le mélange se fait. L'angle d'inclinaison d'environ 30° permet de limiter les pertes de charge au niveau de cette extrémité aval.A downstream end of the mixing tip 7 has an inwardly projecting annular chamfer 7a, inclined at an angle of about 30 ° of the chamfer 7a, to accelerate the movement of the exhaust gas mixture 6 and intake air 5 at the outlet of the mixing nozzle 7. This increase in speed makes it possible to increase the swirling zone at the outlet of the mixing tip 7 where mixing is done. The angle of inclination of approximately 30 ° makes it possible to limit the pressure drops at this downstream end.
Le diamètre intérieur terminal D2 du chanfrein annulaire 7a représente environ deux fois le diamètre intérieur de la conduite de recirculation 4.The inside diameter D2 of the annular chamfer 7a is approximately twice the inside diameter of the recirculation pipe 4.
Ce chanfrein annulaire 7a permet aussi de faire obstacle à la sortie des gaz d'échappement 6 dans le sens du flux d'air, et d'obtenir un flux de gaz d'échappement 6 opposé au flux d'air plus important, vers l'entrée de l'embout mélangeur 7, ce qui améliore le mélange pour de faibles débits de gaz d'échappement.This annular chamfer 7a also makes it possible to obstruct the exit of the exhaust gases 6 in the direction of the air flow, and to obtain an exhaust gas flow 6 opposite to the larger air flow, towards the inlet of the mixing tip 7, which improves the mixing for low exhaust gas flow rates.
Dans l'exemple de réalisation illustré sur les figures 4 et 5, les ailettes de centrage 9 sont formées de tôles pliées, soudées sur la paroi externe de l'embout mélangeur 7 réalisé en acier. Les ailettes 9 sont reçues dans des logements correspondants prévus sur la paroi interne du conduit collecteur d'admission 3. Ces ailettes 9 présentent des griffes 9a de fixation pour mieux s'agripper à la paroi interne plastique du conduit collecteur d'admission 3.In the embodiment illustrated in Figures 4 and 5, the centering fins 9 are formed of folded sheets, welded to the outer wall of the mixing nozzle 7 made of steel. The fins 9 are received in corresponding housings provided on the inner wall of the inlet manifold duct 3. These fins 9 have attachment claws 9a to better grip the plastic inner wall of the intake manifold duct 3.
Une lumière 7b est prévue dans la paroi de l'embout mélangeur 7 pour recevoir le tronçon terminal de la conduite de recirculation 4.A light 7b is provided in the wall of the mixing nozzle 7 to receive the end section of the recirculation pipe 4.
Bien que l'invention ait été décrite avec des exemples particuliers de réalisation, il est bien évident qu'elle n'est nullement limitée à ces exemples et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre des revendications annexées. Although the invention has been described with particular examples of embodiment, it is obvious that it is not limited to these examples and that it includes all the technical equivalents of the means described and their combinations if they are within the scope of the appended claims.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020087016099A KR101084098B1 (en) | 2006-10-19 | 2007-10-11 | Exhaust gas recirculation unit for internal combustion engine |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0609181A FR2907513B1 (en) | 2006-10-19 | 2006-10-19 | DEVICE FOR RECIRCULATING THE EXHAUST GAS OF AN INTERNAL COMBUSTION ENGINE |
| FR0609181 | 2006-10-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2008046987A2 true WO2008046987A2 (en) | 2008-04-24 |
| WO2008046987A3 WO2008046987A3 (en) | 2008-06-12 |
Family
ID=38001920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2007/001664 WO2008046987A2 (en) | 2006-10-19 | 2007-10-11 | Exhaust gases recirculation device for an internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101084098B1 (en) |
| FR (1) | FR2907513B1 (en) |
| WO (1) | WO2008046987A2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010022494A1 (en) * | 2010-06-02 | 2011-12-08 | Pierburg Gmbh | Exhaust intake device for internal combustion engine, comprises air intake channel, and exhaust gas recirculation line, through which exhaust gas is traceable into air intake channel |
| FR2964151A1 (en) * | 2010-08-31 | 2012-03-02 | Coutier Moulage Gen Ind | Low pressure system for recirculation of exhaust gas for internal combustion engine i.e. diesel engine, of motor vehicle i.e. car, has injection device that is connected to inlet conduit of turbo compressor in tangential manner |
| KR101166914B1 (en) | 2007-07-02 | 2012-07-18 | 엠제이 꾸띠에 | Exhaust gas recirculation device for an internal combustion engine |
| WO2019233669A1 (en) * | 2018-06-08 | 2019-12-12 | Renault S.A.S | Intake manifold for heat engine with optimized recirculated gas mixing device |
| DE102010036298B4 (en) | 2010-09-03 | 2021-12-23 | Daimler Ag | Internal combustion engine with an exhaust pipe having an impact sleeve |
| CN114562364A (en) * | 2022-04-27 | 2022-05-31 | 山东赛马力发电设备有限公司 | Biomass gas internal combustion generator set |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19933030A1 (en) * | 1999-07-15 | 2001-01-18 | Mann & Hummel Filter | Fluid introduction for a hot fluid in a cavity structure |
| DE10007243C1 (en) * | 2000-02-17 | 2001-04-26 | Daimler Chrysler Ag | Exhaust gas backflow system for an IC motor has a mixing unit where fresh air is mixed with the exhaust at the opening into the backflow channel for an optimum exhaust/fresh air mixture |
| DE10019409C5 (en) * | 2000-04-19 | 2004-04-29 | Daimlerchrysler Ag | Exhaust gas recirculation device for internal combustion engines |
| DE10042247C5 (en) * | 2000-08-29 | 2006-09-14 | Robert Bosch Gmbh | Mixing unit for gas flows on an internal combustion engine |
| EP1270918B1 (en) * | 2001-06-27 | 2004-04-28 | Siemens Aktiengesellschaft | Apparatus for recirculating exhaust gas into an inlet air stream |
-
2006
- 2006-10-19 FR FR0609181A patent/FR2907513B1/en not_active Expired - Fee Related
-
2007
- 2007-10-11 WO PCT/FR2007/001664 patent/WO2008046987A2/en active Application Filing
- 2007-10-11 KR KR1020087016099A patent/KR101084098B1/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101166914B1 (en) | 2007-07-02 | 2012-07-18 | 엠제이 꾸띠에 | Exhaust gas recirculation device for an internal combustion engine |
| DE102010022494A1 (en) * | 2010-06-02 | 2011-12-08 | Pierburg Gmbh | Exhaust intake device for internal combustion engine, comprises air intake channel, and exhaust gas recirculation line, through which exhaust gas is traceable into air intake channel |
| DE102010022494B4 (en) * | 2010-06-02 | 2014-01-09 | Pierburg Gmbh | Abgaseinleitvorrichtung for an internal combustion engine |
| FR2964151A1 (en) * | 2010-08-31 | 2012-03-02 | Coutier Moulage Gen Ind | Low pressure system for recirculation of exhaust gas for internal combustion engine i.e. diesel engine, of motor vehicle i.e. car, has injection device that is connected to inlet conduit of turbo compressor in tangential manner |
| DE102010036298B4 (en) | 2010-09-03 | 2021-12-23 | Daimler Ag | Internal combustion engine with an exhaust pipe having an impact sleeve |
| WO2019233669A1 (en) * | 2018-06-08 | 2019-12-12 | Renault S.A.S | Intake manifold for heat engine with optimized recirculated gas mixing device |
| FR3082241A1 (en) * | 2018-06-08 | 2019-12-13 | Renault S.A.S | INTAKE DISTRIBUTOR FOR A HEAT ENGINE WITH RECIRCULATED GAS MIXING DEVICE |
| CN112437835A (en) * | 2018-06-08 | 2021-03-02 | 雷诺股份公司 | Heat engine intake manifold with optimized recirculated gas mixing device |
| JP2021525847A (en) * | 2018-06-08 | 2021-09-27 | ルノー エス．ア．エス．Ｒｅｎａｕｌｔ Ｓ．Ａ．Ｓ． | Intake manifold for heat engine with optimized recirculating gas mixer |
| JP7618448B2 (en) | 2018-06-08 | 2025-01-21 | ルノー エス．ア．エス． | Intake manifold for a heat engine having an optimized recirculation gas mixer - Patents.com |
| CN114562364A (en) * | 2022-04-27 | 2022-05-31 | 山东赛马力发电设备有限公司 | Biomass gas internal combustion generator set |
| CN114562364B (en) * | 2022-04-27 | 2022-07-15 | 山东赛马力发电设备有限公司 | Biomass gas internal combustion generator set |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008046987A3 (en) | 2008-06-12 |
| KR101084098B1 (en) | 2011-11-16 |
| FR2907513B1 (en) | 2008-12-12 |
| FR2907513A1 (en) | 2008-04-25 |
| KR20080093982A (en) | 2008-10-22 |
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