EP2236804B1 - Dispositif de mélange de gaz en particulier pour les moteurs à combustion interne équipés d'un système de recirculation des gaz d'échappement - Google Patents

Dispositif de mélange de gaz en particulier pour les moteurs à combustion interne équipés d'un système de recirculation des gaz d'échappement Download PDF

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Publication number
EP2236804B1
EP2236804B1 EP09425125A EP09425125A EP2236804B1 EP 2236804 B1 EP2236804 B1 EP 2236804B1 EP 09425125 A EP09425125 A EP 09425125A EP 09425125 A EP09425125 A EP 09425125A EP 2236804 B1 EP2236804 B1 EP 2236804B1
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EP
European Patent Office
Prior art keywords
mixing device
mixing
internal
inlet
intake
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EP09425125A
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German (de)
English (en)
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EP2236804A1 (fr
Inventor
Giuseppe Cereda
Graziano Vietti
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FPT Industrial SpA
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FPT Industrial SpA
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Priority to EP09425125A priority Critical patent/EP2236804B1/fr
Priority to ES09425125T priority patent/ES2399579T3/es
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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
    • 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

Definitions

  • the present invention relates to a device for mixing exhaust gases with intake fresh air of an internal-combustion engine equipped with exhaust gas recirculation system (EGR).
  • EGR exhaust gas recirculation system
  • the exhaust gas recirculation is known in the field with its acronym EGR.
  • the problem is mixing two gases having different pressure and temperature values in the limited mixing length available.
  • the exhaust gases to be recirculated are cooled by a heat exchanger, then they are mixed with compressed air and after that they are cooled in a different heat exchanger; the typical temperatures of the two flows are 130-180°C for the gases coming from the exhaust downstream of the exchanger and about 50°C for the gases coming from the compressor downstream of the aftercooler.
  • the pipe which brings the recirculated exhaust gases may be grafted on the intake pipe, so that the speeds of the two flows are perpendicular or parallel and in opposite direction; the mixing of the two flows takes place in the segment of pipe following this graft.
  • the ratio of recirculated gases in the cylinders has to be as uniform as possible; this is obtained by guaranteeing a complete mixing before the introduction in every intake pipe of each cylinder, for this reason, it is necessary to complete the mixing of the gas in the first segment of the intake pipe.
  • the length of the pipes available for the mixing is usually limited, because of the typical dimensions of the engines.
  • US2003/0226552-A1 shows a device for mixing the exhaust gases which comprises a main body having an inlet for the recirculated exhaust gases and an inlet for the intake fresh air, and which is shaped as to split the flow of the recirculated exhaust gases coming into the device, in order to obtain the mixing of the intake fresh air flow with a plurality of distinct recirculated exhaust gas flows.
  • the two fluids, the recirculated exhaust gases and the intake fresh air have a substantially perpendicular direction
  • the mixer has a substantially cylindrical shape with two segments having different internal diameter, and has a plurality of holes which put into communication an hollow space where the gases are conveyed with the axial pipe where the intake fresh air moves. Through these holes, the recirculated gases are put into communication with the intake air flow in radial direction.
  • the described solution causes an excessive counterpressure when discharging which increases the fuel consumption.
  • DE-4420247-A1 shows a mixer ring for mixing the exhaust gases with the intake air of an engine, using a Venturi tube placed immediately downstream of the throttle valve integrated in the mixer ring segment. This solution, however, causes the slowing down and the vorticity of the airflow upstream of the mixing point, with a consequent drop of the intake pressure and increase of fuel consumption.
  • DE 43 19 380 shows several embodiments of a mixing device having an inverted Venturi tube. According to three of said embodiments, the injection of exhaust gases is performed by means of a central nozzle. Instead, according to another embodiment, DE 43 19 380 shows an inverted Venturi tube in which an annular diffuser is adopted disposed at the minimum internal diameter of the Venturi tube.
  • EP 0 857 870 A2 discloses a mixing device according to the preamble of claim 1.
  • the primary task of this invention is to provide a gas mixing device of improved efficacy.
  • a further purpose of the present invention is to provide a compact mixing device, as to engage a short segment of the intake pipe and to keep the dimensions of the engine reduced, which is also modular and easily usable in the geometries of the intake pipes.
  • a mixing device particularly for mixing the recirculated exhaust gases with the intake air in an EGR system of an internal-combustion engine, comprising: a main body having an inlet for said recirculated exhaust gases substantially perpendicular to an inlet for the intake fresh air; means suitable to split the flow of the recirculated exhaust gases coming into the device as to obtain the mixing of the intake fresh air with a plurality of distinct recirculated exhaust gas flows; characterized in that it comprises an internal shape suitable to realize an inverted Venturi tube, provided with two internal segments with different slope, the segment with the lower slope placed in the direction of said inlet for fresh air, and the segment with higher slope placed in the direction of the output of said mixing.
  • the present invention relates in particular to a mixing device of exhaust gases with intake fresh air of an internal-combustion engine equipped with exhaust gas recirculation system, as described more fully in the claims, which are an integral part of the present description.
  • the mixing device of recirculated gases with intake fresh air coming from outside comprises a main body 11 suitable for being firmly connected to a flange 21 of an intake pipe 20, which may be shaped in any way.
  • the mixing device is preferably embodied having a main body made of metal cast in a single piece, and is provided with through holes 31 on its circumference, with an internal surface suitable for generating a Venturi effect, therefore comprising a constriction area 13a on the intake air side, followed by an expansion area 13b on the output side of the mixture air/exhaust gas, at the inlet of the intake pipe 20.
  • the holes are placed in the area approximately corresponding to the minimum section of the mixing device, in order to facilitate the passing of the exhaust gases through the holes.
  • the holes 31 are such that they create a perforated surface which is approximately equal to the surface of the intake manifold 12 in order to obtain a large enough area for the passing of the gas.
  • Venturi effect increases the speed in the segment downstream of the holes, where the pressure decreases, and it generates a depression, which facilitates the gas intake.
  • the taper ratio may be equal to about 3.
  • the air coming into the device 10 first passes through the segment with the lower taper 13a, and then through the second segment with the higher taper 13b.
  • a flange enlargement 25 suitable to beat against the flange 21 of the intake pipe itself, and to be fixed there, for example with screws 35, possibly with a seal 28 placed in-between.
  • the mixing device enters, at least in part, the flange 21.
  • the mixing device according to the present invention has an hollow space 15 in the area of the holes 31, between the external surface of the central segment of the main body 11 and the internal surface of the flange 21.
  • the inlet 12 for the recirculated exhaust gases may be duly made up of a substantially cylindrical pipe, according to figures 2 and 3 , the axis of said cylindrical pipe 12 being substantially perpendicular to the longitudinal axis of the mixing device.
  • the recirculated exhaust gases reach the mixing device 10 through the exhaust gas intake pipe 12 following the direction indicated by the arrow GAS in the figure.
  • the mixing device functions as follows.
  • the device When the device is assembled, it is placed upstream of the intake manifold 20 and receives the intake fresh air flow from outside according to the direction shown by the arrow AIR in figure 2 , namely according to a direction parallel to the longitudinal axis of the device, which therefore corresponds to the axial direction of the cylindrical pipes segments of the device.
  • the intake air axially enters the device passing through the first cylindrical segment 13a of the device 10 and goes on towards the intake manifold 20.
  • the recirculated gases enter the device in correspondence of the inlet 12, with a flow direction substantially perpendicular to the axial direction, that is with a radial direction, according to what is indicated by the arrow GAS of figure 2 .
  • the incoming recirculated gas flow runs into the wall of the cylindrical ring 31 which deviates it along a direction tangent to said external wall, according to what shown in figure 3 . Therefore the recirculated gas flow entering the device from the intake pipe 12 splits up as shown in figure 3 following the direction tangent to the external wall, clockwise and counter clockwise in a symmetrical way, as a consequence of the symmetry of the device.
  • the recirculated gas are sucked through the holes 31 by the depression created by the intake fresh air, therefore the gases pass through the hollow space 15 to the cylindrical pipe 14 and mix with the intake fresh air.
  • the plurality of passages 31 guarantees a more uniform mixing compared to a single inlet.
  • the mixture obtained this way goes out from the device 10 and enters the intake manifold 20.
  • the device according to this invention allows an optimization of the mixing of exhaust gases with fresh air going into the intake pipes.
  • the device according to the present invention allows the fragmentation of the flow of the recirculated exhaust gases, obtaining a turbulence that enhances the mixing. Moreover, this solution allows to reduce the counterpressure necessary to the discharge and also the drop of the intake pressure, solving the drawbacks affecting the solutions known in the art described above.
  • the mixing device achieves the purpose of providing a very compact and modular device, suitable for being used on various types of engine, thanks to its easy connection with the intake manifold. Therefore the device allows to solve in an extremely easy way the problem of the mixing of the recirculated gases engaging a very short segment of pipe.

Claims (6)

  1. Dispositif de mélange, en particulier pour mélanger les gaz d'échappement recirculés avec l'air d'admission dans un système EGR d'un moteur à combustion interne, comprenant:
    un corps principal (11) ayant une première entrée (12) pour lesdits gaz d'échappement recirculés, sensiblement perpendiculaire à une seconde entrée (14) pour l'air frais d'admission;
    une configuration interne appropriée pour réaliser un tube de Venturi inversé, prévu avec deux segments internes avec une inclinaison différente, avec un segment ayant une inclinaison plus faible (13a) dans la direction de ladite entrée (14) pour l'air frais, et un segment ayant une inclinaison plus importante (13b) dans la direction de la sortie dudit mélange, la jonction desdits segments avec l'inclinaison plus importante et plus faible crée une zone avec un diamètre interne minimum;
    la première entrée (12) ayant une ouverture disposée au niveau de la zone avec un diamètre interne minimum, appropriée pour mettre en communication ladite entrée (12) desdits gaz d'échappement avec la partie interne du dispositif de mélange, et
    ladite ouverture comprend une pluralité de trous radiaux (31), afin de partager l'écoulement des gaz d'échappement recirculés entrant dans le dispositif, en obtenant un mélange de l'écoulement d'air frais d'admission avec une pluralité d'écoulements de gaz d'échappement recirculés distincts;
    lesdits trous (31) étant disposés selon au moins une première circonférence correspondant audit diamètre interne minimum; caractérisé en ce que:
    une autre pluralité de trous (31) sont disposés selon une seconde circonférence parallèle à et à proximité de ladite première circonférence au niveau du segment ayant l'inclinaison plus faible (13a), dont un trou (31) de ladite première (seconde) circonférence est placé de manière angulaire entre deux trous (31) de ladite seconde (première) circonférence et vice versa, et en ce que:
    lesdits trous (31) sont tels qu'ils créent une surface perforée globale égale à approximativement la surface de la première entrée (12) pour lesdits gaz d'échappement.
  2. Dispositif de mélange selon la revendication 1, dans lequel ledit corps principal (11) est approprié pour être fermement raccordé à une bride (21) d'un tuyau d'admission (20) d'un moteur, ledit corps principal entrant au moins en partie dans ladite bride, afin de former une chambre annulaire (15).
  3. Dispositif de mélange selon la revendication 2, dans lequel ladite entrée (12) pour lesdits gaz d'échappement s'ouvre sur ladite chambre annulaire enveloppante (15) dans la partie externe du dispositif de mélange, en correspondance avec le diamètre interne minimum.
  4. Dispositif de mélange selon l'une quelconque des revendications précédentes, dont le corps principal est réalisé à partir d'un métal moulé d'un seul tenant.
  5. Moteur à combustion interne prévu avec un circuit pour la recirculation des gaz d'échappement, comprenant un dispositif de mélange selon une ou plusieurs des revendications précédentes.
  6. Véhicule comprenant un moteur à combustion interne prévu avec un circuit pour la recirculation des gaz d'échappement selon la revendication précédente.
EP09425125A 2009-03-31 2009-03-31 Dispositif de mélange de gaz en particulier pour les moteurs à combustion interne équipés d'un système de recirculation des gaz d'échappement Active EP2236804B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09425125A EP2236804B1 (fr) 2009-03-31 2009-03-31 Dispositif de mélange de gaz en particulier pour les moteurs à combustion interne équipés d'un système de recirculation des gaz d'échappement
ES09425125T ES2399579T3 (es) 2009-03-31 2009-03-31 Dispositivo de mezcla de gas particularmente para motores de combustión interna equipados con un sistema de recirculación del gas de escape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09425125A EP2236804B1 (fr) 2009-03-31 2009-03-31 Dispositif de mélange de gaz en particulier pour les moteurs à combustion interne équipés d'un système de recirculation des gaz d'échappement

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EP2236804A1 EP2236804A1 (fr) 2010-10-06
EP2236804B1 true EP2236804B1 (fr) 2012-11-21

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2005133C2 (nl) 2010-07-23 2012-01-24 Daf Trucks Nv Inrichting voor het mengen van terug te voeren uitlaatgas met verse lucht voor een verbrandingsmotor.
JP5916335B2 (ja) * 2011-10-11 2016-05-11 日野自動車株式会社 Ｅｇｒガス混合装置
CN108317023B (zh) * 2018-03-19 2024-02-13 中国第一汽车股份有限公司 Egr混合装置
CN108561247A (zh) * 2018-03-29 2018-09-21 天津中恒动力研究院有限公司 发动机废气循环系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0561445U (ja) * 1992-01-24 1993-08-13 日産ディーゼル工業株式会社 過給機付内燃機関の排気還流装置
DE4319380C2 (de) 1992-06-12 1998-12-17 Avl Verbrennungskraft Messtech Brennkraftmaschine mit einem Abgasturbolader
DE4420247B4 (de) * 1994-06-10 2004-03-04 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Abgasrückführungseinrichtung für Verbrennungsmotoren, insbesondere mit Plastesaugrohren
IT1291509B1 (it) * 1997-02-11 1999-01-11 Fiat Ricerche Motore a combustione a ciclo diesel, con ricircolo dei gas di scarico, provvisto di dispositivo miscelatore dei gas di ricircolo.
JP4484809B2 (ja) * 2005-02-01 2010-06-16 大阪瓦斯株式会社 エンジン

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ES2399579T3 (es) 2013-04-02

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