WO2016180473A1 - Exhaust gas recirculation system - Google Patents

Exhaust gas recirculation system Download PDF

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Publication number
WO2016180473A1
WO2016180473A1 PCT/EP2015/060411 EP2015060411W WO2016180473A1 WO 2016180473 A1 WO2016180473 A1 WO 2016180473A1 EP 2015060411 W EP2015060411 W EP 2015060411W WO 2016180473 A1 WO2016180473 A1 WO 2016180473A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
intake
gas recirculation
recirculation system
coupling element
Prior art date
Application number
PCT/EP2015/060411
Other languages
French (fr)
Inventor
Laurent Odillard
Aurélien LEVASSEUR
Original Assignee
Valeo Systemes Thermiques
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques filed Critical Valeo Systemes Thermiques
Priority to PCT/EP2015/060411 priority Critical patent/WO2016180473A1/en
Publication of WO2016180473A1 publication Critical patent/WO2016180473A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M26/17—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
    • F02M26/20—Feeding recirculated exhaust gases directly into the combustion chambers or into the intake runners

Definitions

  • the invention relates to the field of motor vehicles and more particularly to exhaust gas recirculation systems.
  • the present application therefore aims to at least partially overcome the disadvantages of the prior art and to provide an improved exhaust gas recirculation system and limiting the phenomenon of dilution of recirculated exhaust gas at the rail of injection.
  • the present invention therefore relates to an exhaust gas recirculation system comprising:
  • an air intake device of a heat engine comprising intake ducts supplying air to the combustion cylinders, each combustion cylinder having a clean intake duct, said intake ducts having an orifice of exhaust, and
  • an exhaust gas recirculation circuit comprising an injection rail having exhaust gas outlets connected to the inlet ports of the intake ducts
  • said exhaust gas recirculation system having a coupling element located between the outlet ports of the injection rail and the inlet ports of the intake ducts, said coupling element comprising a dilution volume.
  • this coupling element and its dilution volume makes it possible to compensate for the increase in pressure during the closing of an intake valve placed at the interface between the end of the intake duct and the cylinder of combustion.
  • This coupling element due to its dilution volume thus prevents the air intake goes up in the injection rail 70 when closing the intake valve.
  • the coupling element is made of material with the injection rail.
  • the coupling element is integral with the intake duct.
  • the coupling element is a separate element placed between the distribution rail and the intake duct.
  • the abrupt section variation of the intake duct corresponds to a section variation greater than 50% of the minimum section of the intake duct.
  • the heat engine is a supercharged engine whose air intake device comprises a charge air cooler.
  • the connection between the intake ducts and the distribution rail is carried out downstream of the charge air cooler.
  • FIG. 1 shows a schematic representation in plan view of an exhaust gas recirculation system
  • FIG. 2 shows a diagrammatic representation in side and sectional view of an exhaust gas recirculation system at an intake duct
  • FIG. 4 shows a graph representing the relationship between the length L and the ratio between the maximum pressure and the average pressure within the injection rail
  • FIG. 4 shows a graph showing the relationship between the length L and the dilution volume.
  • FIG. 1 shows a schematic representation of an exhaust gas recirculation system 1.
  • the latter comprises an air intake device 3 of a heat engine and a recirculation circuit 7 of the exhaust gases.
  • the air intake device 3 comprises in particular intake ducts 30 (visible in FIG. 2) supplying air to the combustion cylinders 5.
  • Each combustion cylinder 5 comprises a clean intake duct 30.
  • said intake ducts 30 comprise an exhaust gas inlet port 32 for connection with the recirculation circuit 7 of the exhaust gas.
  • the recirculation circuit 7 of the exhaust gas comprises an injection rail 70 extending perpendicular to the direction of flow of the intake air and positioned above the admission ducts.
  • the injection rail has outlet orifices 72 connected to the inlet orifices 32 of the intake ducts 30, through which the exhaust gas passes to access the admission ducts.
  • the heat engine may very well be an atmospheric heat engine or be a supercharged heat engine.
  • the air intake device 3 may comprise a charge air cooler 34 as shown in FIGS. 1 and 2. The connection between the intake ducts 30 and the rail distribution 70 is then performed downstream of the charge air cooler 34.
  • the recirculation system 1 of exhaust gas further comprises a coupling element 9 placed between the outlet orifices 72 of the injection rail 70 and the inlet orifices 32 of the intake ducts 30.
  • This coupling element 9 comprises a dilution volume enabling it to compensate for the increase in pressure when closing an intake valve 9 placed at the interface between the end of the intake duct 30 and the combustion cylinder 5.
  • This element of coupling 9 by its dilution volume thus avoids that the intake air rises in the injection rail 70 during this closing of the intake valve.
  • the coupling element 9 can be integral with the injection rail 70. According to a second embodiment, the coupling element 9 can be integral with the intake duct 30. According to a third embodiment, the coupling element 9 may be a separate element placed between the outlet orifices 72 of the distribution rail 70 and the inlet orifices 32 of the intake duct 30.
  • this risk of dilution was dependent on a length L corresponding to the length, in m, between an intake valve head 11 of the combustion cylinder 5, placed at the end of the intake duct 30, and a first abrupt section change of said intake duct 30.
  • This abrupt variation of the section 13 may for example be a section variation greater than 50% of the minimum section of the intake duct 30.
  • the graph of FIG. 3 shows the evolution of the ratio between the maximum pressure / average pressure within the injection rail 70 (characterizing the dilution of the exhaust gases by raising the intake air within the rail injection 70) as a function of the length L and for different mass flow rates of intake air passing through the air intake device 3.
  • the curves all have an exponential decay profile indicating that the higher the length L is large, the risk of dilution of the exhaust gas by rising intake air within the injection rail 70 are low.
  • dilution volumes within the coupling element 9 as a function of the length L, for which the values of the ratio of maximum pressure / average pressure within injection rail 70 are such that there is dilution (zone 101), that the dilution risks are reasonable (zone 102), that the risks of dilution are low (zone 103) and that there is not dilution (zone 104).

Abstract

The invention relates to an exhaust gas recirculation system (1) comprising: an air admission device (3) of a heat engine comprising admission conduits (30) supplying air to the combustion cylinders (5), each combustion cylinder (5) comprising its own admission conduit (30), said admission conduits (30) comprising an opening (32) for the inflow of exhaust gases, and a recirculation circuit (7) for the recirculation of the exhaust gases, comprising an injection rail (70) having openings (72) for the outflow of the exhaust gases, which are connected to the inflow openings (32) of the admission conduits (30), said exhaust gas recirculation system (1) comprising a coupling element (9) placed between the outflow openings (72) of the injection rail (70) and the inflow openings (32) of the admission conduits (30), said coupling element (9) comprising a dilution volume.

Description

Système de recirculation de gaz d'échappement.  Exhaust gas recirculation system.
L'invention se rapporte au domaine des véhicules automobiles et plus particulièrement aux systèmes de recirculation de gaz d'échappement. The invention relates to the field of motor vehicles and more particularly to exhaust gas recirculation systems.
Afin de réduire les émissions polluantes, notamment en oxydes d'azote, il est connu de réinjecter une partie des gaz d'échappement dans l'arrivée d'air d'admission au moyen d'un système de recirculation des gaz d'échappement. L'injection de ces gaz d'échappement recirculés dans l'air d'admission peut être réalisée au moyen d'un rail d'injection, perpendiculaire au flux d'air d'admission, muni d'orifices permettant l'arrivée de gaz d'échappement recirculés au niveau de chaque cylindre de combustion. La quantité de gaz d'échappement recirculés arrivant dans l'air d'admission des cylindres de combustion est contrôlée par une vanne spécifique dite vanne EGR placée en amont du rail d'injection. Il est en effet nécessaire de contrôler précisément la quantité de gaz d'échappement recirculés arrivant dans chaque cylindre de combustion afin de respecter l'équilibre entre les émissions d'oxydes d'azotes et de particules issues de cette recirculation. In order to reduce the polluting emissions, in particular of nitrogen oxides, it is known to reinject a portion of the exhaust gases into the intake air intake by means of an exhaust gas recirculation system. The injection of these recirculated exhaust gases into the intake air can be achieved by means of an injection rail, perpendicular to the intake air flow, provided with orifices allowing the arrival of gas recirculated exhaust at each combustion cylinder. The amount of recirculated exhaust gas entering the intake air of the combustion cylinders is controlled by a specific valve called EGR valve placed upstream of the injection rail. It is indeed necessary to precisely control the amount of recirculated exhaust gas arriving in each combustion cylinder in order to respect the balance between the emissions of nitrogen oxides and particles resulting from this recirculation.
Cependant lors du fonctionnement du moteur, lors de la fermeture de la soupape d'admission d'air des cylindres de combustion, une augmentation de la pression d'air a lieu. Cette augmentation de la pression peut remonter le conduit d'admission jusqu'au rail d'injection et de l'air d'admission peut s'infiltrer dans ledit rail d'injection créant une dilution des gaz d'échappement recirculés s'y trouvant. Cette dilution des gaz d'échappement recirculés dans le rail d'injection nuit au bon fonctionnement du système de recirculation des gaz d'échappement et peut diminuer son efficacité. However, during operation of the engine, when closing the air intake valve of the combustion cylinders, an increase in air pressure occurs. This increase in pressure can go up the intake duct to the injection rail and intake air can infiltrate into said injection rail creating a dilution of the recirculated exhaust gas therein . This dilution of the recirculated exhaust gas in the injection rail at night the proper functioning of the exhaust gas recirculation system and may reduce its effectiveness.
La présente demande a donc comme but de remédier au moins partiellement aux inconvénients de l'art antérieur et de proposer un système de recirculation des gaz d'échappement amélioré et limitant le phénomène de dilution des gaz d'échappement recirculés au niveau du rail d'injection. La présente invention concerne donc un système de recirculation de gaz d'échappement comportant : The present application therefore aims to at least partially overcome the disadvantages of the prior art and to provide an improved exhaust gas recirculation system and limiting the phenomenon of dilution of recirculated exhaust gas at the rail of injection. The present invention therefore relates to an exhaust gas recirculation system comprising:
un dispositif d'admission d'air d'un moteur thermique comprenant des conduits d'admission amenant de l'air aux cylindres de combustion, chaque cylindre de combustion comportant un conduit d'admission propre, lesdits conduits d'admission comportant un orifice d'arrivée de gaz d'échappement, et  an air intake device of a heat engine comprising intake ducts supplying air to the combustion cylinders, each combustion cylinder having a clean intake duct, said intake ducts having an orifice of exhaust, and
un circuit de recirculation des gaz d'échappement comprenant un rail d'injection comportant des orifices de sortie des gaz d'échappement connectés aux orifices d'arrivée des conduits d'admission,  an exhaust gas recirculation circuit comprising an injection rail having exhaust gas outlets connected to the inlet ports of the intake ducts,
ledit système de recirculation de gaz d'échappement comportant un élément de couplage placé entre les orifices de sortie du rail d'injection et les orifices d'arrivée des conduits d'admission, ledit élément de couplage comprenant un volume de dilution.  said exhaust gas recirculation system having a coupling element located between the outlet ports of the injection rail and the inlet ports of the intake ducts, said coupling element comprising a dilution volume.
La présence de cet élément de couplage et de son volume de dilution permet de compenser l'augmentation de pression lors de la fermeture d'une soupape d'admission placée à l'interface entre l'extrémité du conduit d'admission et le cylindre de combustion. Cet élément de couplage de part son volume de dilution évite ainsi que l'air d'admission remonte dans le rail d'injection 70 lors de cette fermeture de la soupape d'admission. The presence of this coupling element and its dilution volume makes it possible to compensate for the increase in pressure during the closing of an intake valve placed at the interface between the end of the intake duct and the cylinder of combustion. This coupling element due to its dilution volume thus prevents the air intake goes up in the injection rail 70 when closing the intake valve.
Selon un aspect de l'invention, la valeur minimale Vmin en m3 du volume de dilution de l'élément de couplage est supérieur ou égale à Vmin = (15394 x L)— 1540, L correspondant à la longueur en m entre une tête de soupape d'admission du cylindre de combustion placée à l'extrémité du conduit d'admission et une première variation brusque de section dudit conduit d'admission. According to one aspect of the invention, the minimum value Vmin in m 3 of the dilution volume of the coupling element is greater than or equal to Vmin = (15394 x L) - 1540, L corresponding to the length in m between a head intake valve of the combustion cylinder placed at the end of the intake duct and a first abrupt section change of said intake duct.
Selon un autre aspect de l'invention, l'élément de couplage vient de matière avec le rail d'injection. According to another aspect of the invention, the coupling element is made of material with the injection rail.
Selon un autre aspect de l'invention, l'élément de couplage vient de matière avec le conduit d'admission. According to another aspect of the invention, the coupling element is integral with the intake duct.
Selon un autre aspect de l'invention, l'élément de couplage est un élément distinct placé entre le rail de distribution et le conduit d'admission. According to another aspect of the invention, the coupling element is a separate element placed between the distribution rail and the intake duct.
Selon un autre aspect de l'invention, la variation brusque de section du conduit d'admission correspond à une variation de section supérieure à 50% de la section minimale du conduit d'admission. Selon un autre aspect de l'invention, le moteur thermique est un moteur thermique suralimenté dont le dispositif d'admission d'air comporte un refroidisseur d'air de suralimentation. Selon un autre aspect de l'invention, la connexion entre les conduits d'admission et le rail de distribution est réalisée en aval du refroidisseur d'air de suralimentation. According to another aspect of the invention, the abrupt section variation of the intake duct corresponds to a section variation greater than 50% of the minimum section of the intake duct. According to another aspect of the invention, the heat engine is a supercharged engine whose air intake device comprises a charge air cooler. According to another aspect of the invention, the connection between the intake ducts and the distribution rail is carried out downstream of the charge air cooler.
D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante, donnée à titre d'exemple illustratif et non limitatif, et des dessins annexés parmi lesquels : Other features and advantages of the invention will emerge more clearly on reading the following description, given by way of illustrative and nonlimiting example, and the appended drawings among which:
- la figure 1 montre une représentation schématique en vue de dessus d'un système de recirculation de gaz d'échappement,  FIG. 1 shows a schematic representation in plan view of an exhaust gas recirculation system,
- la figure 2 montre une représentation schématique en vue de côté et en coupe d'un système de recirculation de gaz d'échappement au niveau d'un conduit d'admission,  FIG. 2 shows a diagrammatic representation in side and sectional view of an exhaust gas recirculation system at an intake duct,
- la figure 3 la figure 4 montre un graphique représentant la relation entre la longueur L et le rapport entre la pression maximum et la pression moyenne au sein du rail d'injection, et  FIG. 4 shows a graph representing the relationship between the length L and the ratio between the maximum pressure and the average pressure within the injection rail, and
- la figure 4 montre un graphique représentant la relation entre la longueur L et le volume de dilution.  - Figure 4 shows a graph showing the relationship between the length L and the dilution volume.
Sur les différentes figures, les éléments identiques portent les mêmes numéros de référence. In the different figures, the identical elements bear the same reference numbers.
La figure 1 montre une représentation schématique d'un système de recirculation de gaz d'échappement 1. Ce dernier comporte un dispositif d'admission d'air 3 d'un moteur thermique ainsi qu'un circuit de recirculation 7 des gaz d'échappement. Le dispositif d'admission d'air 3 comprend notamment des conduits d'admission 30 (visibles sur la figure 2) amenant de l'air aux cylindres de combustion 5. Chaque cylindre de combustion 5 comporte un conduit d'admission 30 propre. Comme montré sur la figure 2, lesdits conduits d'admission 30 comportent un orifice d'arrivée 32 de gaz d'échappement permettant la connexion avec le circuit de recirculation 7 des gaz d'échappement. FIG. 1 shows a schematic representation of an exhaust gas recirculation system 1. The latter comprises an air intake device 3 of a heat engine and a recirculation circuit 7 of the exhaust gases. . The air intake device 3 comprises in particular intake ducts 30 (visible in FIG. 2) supplying air to the combustion cylinders 5. Each combustion cylinder 5 comprises a clean intake duct 30. As shown in Figure 2, said intake ducts 30 comprise an exhaust gas inlet port 32 for connection with the recirculation circuit 7 of the exhaust gas.
Le circuit de recirculation 7 des gaz d'échappement comprend un rail d'injection 70 s'étendant perpendiculairement au sens de circulation de l'air d'admission et positionné au dessus des conduits d'admissions. Le rail d'injection comporte des orifices de sortie 72 connectés aux orifices d'arrivée 32 des conduits d'admission 30, par lesquels les gaz d'échappement transitent pour accéder aux conduits d'admissions. Le moteur thermique peut très bien être un moteur thermique atmosphérique ou encore être un moteur thermique suralimenté. Dans le cas d'un moteur thermique suralimenté, le dispositif d'admission 3 d'air peut comporter un refroidisseur d'air de suralimentation 34 comme montré sur les figures 1 et 2. La connexion entre les conduits d'admission 30 et le rail de distribution 70 est alors réalisée en aval du refroidisseur d'air de suralimentation 34.  The recirculation circuit 7 of the exhaust gas comprises an injection rail 70 extending perpendicular to the direction of flow of the intake air and positioned above the admission ducts. The injection rail has outlet orifices 72 connected to the inlet orifices 32 of the intake ducts 30, through which the exhaust gas passes to access the admission ducts. The heat engine may very well be an atmospheric heat engine or be a supercharged heat engine. In the case of a supercharged engine, the air intake device 3 may comprise a charge air cooler 34 as shown in FIGS. 1 and 2. The connection between the intake ducts 30 and the rail distribution 70 is then performed downstream of the charge air cooler 34.
Le système de recirculation 1 de gaz d'échappement comporte en outre un élément de couplage 9 placé entre les orifices de sortie 72 du rail d'injection 70 et les orifices d'arrivée 32 des conduits d'admission 30. Cet élément de couplage 9 comprend un volume de dilution lui permettant de compenser l'augmentation de pression lors de la fermeture d'une soupape d'admission 9 placée à l'interface entre l'extrémité du conduit d'admission 30 et le cylindre de combustion 5. Cet élément de couplage 9 de part son volume de dilution évite ainsi que l'air d'admission remonte dans le rail d'injection 70 lors de cette fermeture de la soupape d'admission. The recirculation system 1 of exhaust gas further comprises a coupling element 9 placed between the outlet orifices 72 of the injection rail 70 and the inlet orifices 32 of the intake ducts 30. This coupling element 9 comprises a dilution volume enabling it to compensate for the increase in pressure when closing an intake valve 9 placed at the interface between the end of the intake duct 30 and the combustion cylinder 5. This element of coupling 9 by its dilution volume thus avoids that the intake air rises in the injection rail 70 during this closing of the intake valve.
Selon un premier mode de réalisation, l'élément de couplage 9 peut venir de matière avec le rail d'injection 70. Selon un second mode de réalisation, l'élément de couplage 9 peut venir de matière avec le conduit d'admission 30. Selon un troisième mode de réalisation, l'élément de couplage 9 peut être un élément distinct placé entre les orifices de sortie 72 du rail de distribution 70 et les orifices d'arrivée 32 du conduit d'admission 30. According to a first embodiment, the coupling element 9 can be integral with the injection rail 70. According to a second embodiment, the coupling element 9 can be integral with the intake duct 30. According to a third embodiment, the coupling element 9 may be a separate element placed between the outlet orifices 72 of the distribution rail 70 and the inlet orifices 32 of the intake duct 30.
Afin d'établir la valeur minimale du volume Vmin de dilution au dessus de laquelle le risque de dilution est raisonnable, la demanderesse a découvert de façon surprenante et inattendue que ce risque de dilution était dépendant d'une longueur L correspondant à la longueur, en m, entre une tête de soupape d'admission 11 du cylindre de combustion 5, placée à l'extrémité du conduit d'admission 30, et une première variation brusque de section 13 dudit conduit d'admission 30. Cette variation brusque de la section 13 peut par exemple être une variation de section supérieure à 50% de la section minimale du conduit d'admission 30. In order to establish the minimum value of the dilution volume Vmin above which the risk of dilution is reasonable, the Applicant surprisingly and unexpectedly discovered that this risk of dilution was dependent on a length L corresponding to the length, in m, between an intake valve head 11 of the combustion cylinder 5, placed at the end of the intake duct 30, and a first abrupt section change of said intake duct 30. This abrupt variation of the section 13 may for example be a section variation greater than 50% of the minimum section of the intake duct 30.
Le graphique de la figure 3 montre l'évolution du rapport entre la pression maximum/ pression moyenne au sein du rail d'injection 70 (caractérisant la dilution des gaz d'échappement par remontée de l'air d'admission au sein du rail d'injection 70) en fonction de la longueur L et ce pour différent débits massique d'air d'admission traversant le dispositif d'admission d'air 3. Sur ce graphique, les courbes ont toutes un profil de décroissance exponentielle indiquant que plus la longueur L est grande, plus les risques de dilution des gaz d'échappement par remontée de l'air d'admission au sein du rail d'injection 70 sont faibles. The graph of FIG. 3 shows the evolution of the ratio between the maximum pressure / average pressure within the injection rail 70 (characterizing the dilution of the exhaust gases by raising the intake air within the rail injection 70) as a function of the length L and for different mass flow rates of intake air passing through the air intake device 3. In this graph, the curves all have an exponential decay profile indicating that the higher the length L is large, the risk of dilution of the exhaust gas by rising intake air within the injection rail 70 are low.
La demanderesse a constaté qu'au dessus d'un rapport de pression maximum/ pression moyenne au sein du rail d'injection 70 de 1.26 il y a dilution des gaz d'échappement par remontée de l'air d'admission au sein du rail d'injection 70. Cela correspond à la zone hachurée 101 sur le graphique de la figure 3. The Applicant has found that above a ratio of maximum pressure / average pressure within the injection rail 70 of 1.26 there is dilution of the exhaust gas by raising the intake air within the rail This corresponds to the shaded area 101 on the graph of FIG.
Pour un rapport entre 1.26 et 1.18 les risques de dilution sont raisonnables. Cela correspond à la zone hachurée 102 sur le graphique de la figure 3.  For a ratio between 1.26 and 1.18 the dilution risks are reasonable. This corresponds to the shaded area 102 on the graph of FIG.
Pour un rapport entre 1.18 et 1.12 les risques de dilution sont faibles. Cela correspond à la zone hachurée 103 sur le graphique de la figure 3.  For a ratio between 1.18 and 1.12 the dilution risks are low. This corresponds to the shaded area 103 on the graph of FIG.
Pour un rapport en dessous de 1.12, il n'y a pas de dilution des gaz d'échappement par remontée de l'air d'admission au sein du rail d'injection 70. Cela correspond à la zone hachurée 104 sur le graphique de la figure 3. II est alors possible en fonction de ces valeurs, de définir des volumes de dilution au sein de l'élément de couplage 9 en fonction de la longueur L, pour lesquels les valeurs du rapport de pression maximum/ pression moyenne au sein du rail d'injection 70 sont telles qu'il y a dilution (zone 101), que les risques de dilution sont raisonnables (zone 102), que les risques de dilution sont faibles (zone 103) et qu'il n'y a pas dilution (zone 104).  For a ratio below 1.12, there is no dilution of the exhaust gas by raising the intake air within the injection rail 70. This corresponds to the hatched area 104 on the graph of FIG. It is then possible according to these values, to define dilution volumes within the coupling element 9 as a function of the length L, for which the values of the ratio of maximum pressure / average pressure within injection rail 70 are such that there is dilution (zone 101), that the dilution risks are reasonable (zone 102), that the risks of dilution are low (zone 103) and that there is not dilution (zone 104).
Ces valeurs sont illustrées sur le graphique de la figure 4, montrant ces différentes zones en fonction du volume de dilution V de l'élément de couplage 9 en fonction de la longueur L. Ainsi, en calculant l'équation de la droite 101a, il est possible de déterminer la formule du calcul du volume minimum Vmin au dessus de laquelle les risques de dilution sont raisonnables : Vmin = (15394 x L)— 1540. These values are illustrated in the graph of FIG. 4, showing these different zones as a function of the dilution volume V of the coupling element 9 as a function of the length L. Thus, by calculating the equation of the line 101a, it is possible to determine the formula for calculating the minimum volume Vmin above which the risks of dilution are reasonable: Vmin = (15394 x L) - 1540.
De même, calculant l'équation de la droite 102a, il serait possible de déterminer la formule du calcul du volume minimum Vmin au dessus de laquelle les risques de dilution sont faibles. En calculant l'équation de la droite 103a, il serait possible de déterminer la formule du calcul du volume minimum Vmin au dessus de laquelle il n'y a pas de dilution.  Similarly, calculating the equation of the straight line 102a, it would be possible to determine the formula for calculating the minimum volume Vmin above which the risks of dilution are low. By calculating the equation of the line 103a, it would be possible to determine the formula for calculating the minimum volume Vmin above which there is no dilution.
Ainsi, du fait de la présence de l'élément de couplage 9 et de son volume de dilution, on voit que la dilution des gaz d'échappement au sein d'un rail d'injection 70 lors de la fermeture des soupapes d'admission 11 peut être évitée et ainsi permettre au système de recirculation de gaz d'échappement 1 de fonctionner pleinement. Thus, because of the presence of the coupling element 9 and its dilution volume, it can be seen that the dilution of the exhaust gases within an injection rail 70 during the closing of the intake valves It can be avoided and thus allow the exhaust gas recirculation system 1 to operate fully.

Claims

REVENDICATIONS
1. Système de recirculation de gaz d'échappement (1) comportant : An exhaust gas recirculation system (1) comprising:
un dispositif d'admission d'air (3) d'un moteur thermique comprenant des conduits d'admission (30) amenant de l'air aux cylindres de combustion (5), chaque cylindre de combustion (5) comportant un conduit d'admission (30) propre, lesdits conduits d'admission (30) comportant un orifice d'arrivée (32) de gaz d'échappement, et  an air intake device (3) of a heat engine comprising intake ducts (30) supplying air to the combustion cylinders (5), each combustion cylinder (5) having a duct clean intake (30), said intake ducts (30) having an exhaust inlet (32), and
- un circuit de recirculation (7) des gaz d'échappement comprenant un rail d'injection (70) comportant des orifices de sortie (72) des gaz d'échappement connectés aux orifices d'arrivée (32) des conduits d'admission (30),  an exhaust gas recirculation circuit (7) comprising an injection rail (70) having outlet orifices (72) for the exhaust gases connected to the inlet ports (32) of the intake ducts ( 30),
caractérisé en ce que ledit système de recirculation (1) de gaz d'échappement comporte un élément de couplage (9) placé entre les orifices de sortie (72) du rail d'injection (70) et les orifices d'arrivée (32) des conduits d'admission (30), ledit élément de couplage (9) comprenant un volume de dilution.  characterized in that said exhaust gas recirculation system (1) has a coupling element (9) located between the outlet ports (72) of the injection rail (70) and the inlet ports (32). intake ducts (30), said coupling member (9) comprising a dilution volume.
2. Système de recirculation (1) de gaz d'échappement selon la revendication 1, caractérisé en ce que la valeur minimale Vmin en m3 du volume de dilution de l'élément de couplage (9) est supérieur ou égale à Vmin = (15394 x L)— 1540, L correspondant à la longueur en m entre une tête de soupape d'admission (11) du cylindre de combustion (5) placée à l'extrémité du conduit d'admission (30) et une première variation brusque de section (13) dudit conduit d'admission (30). Exhaust gas recirculation system (1) according to Claim 1, characterized in that the minimum value Vmin in m 3 of the dilution volume of the coupling element (9) is greater than or equal to Vmin = ( 15394 x L) - 1540, L corresponding to the length in m between an intake valve head (11) of the combustion cylinder (5) at the end of the intake duct (30) and a first sudden change section (13) of said intake duct (30).
3. Système de recirculation (1) de gaz d'échappement selon l'une des revendications 1 ou 2, caractérisé en ce que l'élément de couplage (9) vient de matière avec le rail d'injection (70). 3. Exhaust gas recirculation system (1) according to one of claims 1 or 2, characterized in that the coupling element (9) is made of material with the injection rail (70).
4. Système de recirculation (1) de gaz d'échappement selon la revendication 1, caractérisé en ce que l'élément de couplage (9) vient de matière avec le conduit d'admission (30). Exhaust gas recirculation system (1) according to claim 1, characterized in that the coupling element (9) is integral with the intake duct (30).
5. Système de recirculation (1) de gaz d'échappement selon la revendication 1, caractérisé en ce que l'élément de couplage (9) est un élément distinct placé entre le rail de distribution (70) et le conduit d'admission (30). Exhaust gas recirculation system (1) according to Claim 1, characterized in that the coupling element (9) is a separate element arranged between the distribution rail (70) and the intake duct ( 30).
6. Système de recirculation (1) de gaz d'échappement selon la revendication 2 ou la revendication 3 prise dans son rattachement à la revendication 2, caractérisé en ce que la variation brusque de section (13) du conduit d'admission (30) correspond à une variation de section supérieure à 50% de la section minimale du conduit d'admission (30). 6. Exhaust gas recirculation system (1) according to claim 2 or claim 3 taken in its connection to claim 2, characterized in that the abrupt section variation (13) of the intake duct (30) corresponds to a section variation greater than 50% of the minimum section of the intake duct (30).
7. Système de recirculation (1) de gaz d'échappement selon l'une des revendications précédentes, caractérisé en ce que le moteur thermique est un moteur thermique suralimenté dont le dispositif d'admission (3) d'air comporte un refroidisseur d'air de suralimentation (34). 7. recirculation system (1) of exhaust gas according to one of the preceding claims, characterized in that the engine is a supercharged engine whose air intake (3) comprises a cooler of charge air (34).
8. Système de recirculation (1) de gaz d'échappement selon la revendication précédente, caractérisé en ce que la connexion entre les conduits d'admission (30) et le rail de distribution (70) est réalisée en aval du refroidisseur d'air de suralimentation (34). 8. Exhaust gas recirculation system (1) according to the preceding claim, characterized in that the connection between the intake ducts (30) and the distribution rail (70) is carried out downstream of the air cooler. supercharging system (34).
PCT/EP2015/060411 2015-05-12 2015-05-12 Exhaust gas recirculation system WO2016180473A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381749A (en) * 1980-02-21 1983-05-03 Yamaha Hatsudoki Kabushiki Kaisha Intake device for engine
EP0855502A2 (en) * 1997-01-23 1998-07-29 AVL List GmbH Internal combustion engine with exhaust gas recirculation device
JP2006242074A (en) * 2005-03-02 2006-09-14 Toyota Motor Corp Premix combustion compression ignition internal combustion engine
DE102007051158A1 (en) * 2006-11-17 2008-05-21 GM Global Technology Operations, Inc., Detroit Low load air delivery system for an internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381749A (en) * 1980-02-21 1983-05-03 Yamaha Hatsudoki Kabushiki Kaisha Intake device for engine
EP0855502A2 (en) * 1997-01-23 1998-07-29 AVL List GmbH Internal combustion engine with exhaust gas recirculation device
JP2006242074A (en) * 2005-03-02 2006-09-14 Toyota Motor Corp Premix combustion compression ignition internal combustion engine
DE102007051158A1 (en) * 2006-11-17 2008-05-21 GM Global Technology Operations, Inc., Detroit Low load air delivery system for an internal combustion engine

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