FR2840648A1 - Device for control of exhaust gas recirculation for diesel engine comprises pipe and valve connected downstream of turbine and upstream of compressor - Google Patents
Device for control of exhaust gas recirculation for diesel engine comprises pipe and valve connected downstream of turbine and upstream of compressor Download PDFInfo
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- FR2840648A1 FR2840648A1 FR0207172A FR0207172A FR2840648A1 FR 2840648 A1 FR2840648 A1 FR 2840648A1 FR 0207172 A FR0207172 A FR 0207172A FR 0207172 A FR0207172 A FR 0207172A FR 2840648 A1 FR2840648 A1 FR 2840648A1
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- engine
- turbine
- compressor
- exhaust gas
- exhaust
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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
- 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
- F02M26/34—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with compressors, turbines or the like in the recirculation passage
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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
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
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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
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
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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)
- Exhaust Gas After Treatment (AREA)
- Supercharger (AREA)
Abstract
Description
composite fibres-matrice.fiber-matrix composite.
La presente invention se rapporte a un dispositif et a un procede de controle de la recirculation des gaz d'echappement pour un moteur a combustion interne, notamment pour un moteur de type Diesel pouvant The present invention relates to a device and a method for controlling the recirculation of exhaust gases for an internal combustion engine, in particular for a diesel type engine which can
fonctionner en mode de combustion homogene. operate in homogeneous combustion mode.
Dans les dispositifs classiques de recirculation des gaz d'echappement pour des moteurs a combustion interne, les gaz d'echappement issus de la combustion du melange carbure vent reinjectes partiellement dans les chambres de combustion de moteur. Cette reinjection permet, apres la combustion du melange carbure additionne de ces gaz d'echappement, d'obtenir des gaz d'echappement sortant du moteur avec une quantite minime de polluants, tels que les oxydes d'azotes, permettant de respecter ainsi les In conventional exhaust gas recirculation devices for internal combustion engines, the exhaust gases from the combustion of the carbide mixture wind partially reinjected into the engine combustion chambers. This reinjection makes it possible, after the combustion of the carbide mixture and the addition of these exhaust gases, to obtain exhaust gases leaving the engine with a minimal amount of pollutants, such as nitrogen oxides, thus making it possible to respect the
normes anti-pollutions.anti-pollution standards.
Cette recirculation de gaz d'echappement se fait par tous moyens et notamment par un conduit, denomme conduit d'EGR (en anglais << Exhaust Gas Recirculation >), qui prend naissance a l'echappement du moteur et qui aboutit This exhaust gas recirculation is done by any means and in particular by a duct, called EGR duct (in English << Exhaust Gas Recirculation >>), which starts at the exhaust of the engine and which ends
a son admission.at his admission.
Dans le cas de moteurs a combustion interne suralimentes grace a I' utilisation d'un tu rbocompresseur, il est prevu d' utiliser tout ou partie des gaz In the case of supercharged internal combustion engines through the use of a turbocharger, it is intended to use all or part of the gases
d'echappement sortant du moteur pour entraner en rotation la turbine qui elle- exhaust system leaving the engine to rotate the turbine which itself
meme entrane le compresseur pour obtenir un fluide a une pression donnee, dit air de suralimentation, a la sortie du compresseur. Cet air de suralimentation est ensuite injecte dans les chambres de combustion de ce moteur pour It even drives the compressor to obtain a fluid at a given pressure, called charge air, at the outlet of the compressor. This supercharging air is then injected into the combustion chambers of this engine for
obtenir, apres combustion, la puissance desiree au moteur. obtain, after combustion, the desired power to the engine.
Ainsi, pour pouvoir entraner en rotation la turbine a une vitesse suffisante pour obtenir une pression souhaitee en sortie du compresseur et repondre egalement aux normes anti-pollutions, il est generalement trouve un compromis entre la quantite de gaz d'echappement recircules et injectes dans les chambres de combustion pour reduire les polluants et celle transmise a la Thus, in order to drive the turbine in rotation at a speed sufficient to obtain a desired pressure at the outlet of the compressor and also meet the anti-pollution standards, it is generally found a compromise between the amount of exhaust gas recirculated and injected into the combustion chambers to reduce pollutants and that transmitted to the
turbine pour l'entranement du compresseur. turbine for driving the compressor.
Ce probleme devient plus crucial dans le cas de moteur suralimente a This problem becomes more crucial in the case of engine supercharged
combustion interne fonctionnant en mode de combustion homogene. internal combustion operating in homogeneous combustion mode.
Ce mode de combustion homogene, qui est mieux decrit dans la demande N 00/16823 du demandeur, permet d'obtenir un melange carbure homogene grace au fait que ['injection de carburant se realise par l'intermediaire d'un injecteur avec un angle de nappe relativement faible choisi This homogeneous combustion method, which is better described in applicant's application N 00/16823, makes it possible to obtain a homogeneous carbide mixture by virtue of the fact that fuel injection is carried out by means of an injector with an angle of relatively low tablecloth chosen
de fa,con que les jets de carburant ne touchent pas les parois du cylindre. so that the fuel jets do not touch the walls of the cylinder.
Dans ce mode de combustion homogene, il est necessaire d'utiliser un fort taux de gaz d'echappement recircules, de ltordre de 50% du melange present In this homogeneous combustion mode, it is necessary to use a high rate of recirculated exhaust gas, of the order of 50% of the present mixture.
dans les chambres de combustion, pour contrdier cette combustion. in the combustion chambers, to counter this combustion.
Cette necessite oblige a utiliser un air de suralimentation a pression relativement forte de maniere a pouvoir disposer, dans les chambres de combustion, d'un melange carbure disposant de suffisamment d'oxygene pour This necessitates the use of a supercharging air at relatively high pressure so as to have in the combustion chambers, a carbide mixture with sufficient oxygen for
brGler le carburant injecte.burn the injected fuel.
Cet objectif de pression ne peut etre atteint qu'au detriment, d'une part, de la reduction des polluants resultant de la combustion et, d'autre part, du This pressure objective can be achieved only to the detriment, on the one hand, of the reduction of pollutants resulting from combustion and, on the other hand, of the
controle de la combustion homogene.control of homogeneous combustion.
De plus, ce mode de combustion peut entraner une diminution de la temperature des gaz d'echappement, de l'ordre de 50 a 100 C, a la sortie du moteur, ce qui engendre une diminution d'energie qui peut etre insuffisante a la In addition, this mode of combustion can cause a decrease in the temperature of the exhaust gas, of the order of 50 to 100 C, at the output of the engine, which causes a decrease in energy that may be insufficient at the
turbine pour obtenir la pression de suralimentation desiree. turbine to obtain the desired boost pressure.
Cet abaissement de temperature est d'autant plus problematique que la plupart des moteurs utilisent un dispositif de depollution des gaz d'echappement utilisant un ou plusieurs catalyseurs, notamment un catalyseur This lowering of temperature is all the more problematic since most engines use an exhaust gas depollution device using one or more catalysts, in particular a catalytic converter.
d'oxydation, qui est situe apres la turbine. oxidation, which is located after the turbine.
Ce type de catalyseur n'est operationnel qu'a partir d'une temperature determinee, cite temperature de << light off >>, qui lui est transmise par les gaz d'echappement. Compte tenu de l'abaissement de la temperature des gaz d'echappement, dG non seulement au mode de combustion homogene mais egalement a la deperdition de chaleur lors de la traversee de la turbine, ce catalyseur ne pourra etre operationnel que plus tardivement. Durant cette periode d'inaction du catalyseur, les polluants presents dans les gaz This type of catalyst is operational only from a given temperature, quoted temperature of "light off", which is transmitted to it by the exhaust gases. In view of the lowering of the exhaust gas temperature, not only to the homogeneous combustion mode but also to the loss of heat during the passage of the turbine, this catalyst can not be operational until later. During this period of catalyst inaction, the pollutants present in the gases
d'echappement ne vent done pas traites et vent rejetes dans ['atmosphere. Exhaust is therefore not treated and vented into the atmosphere.
La presente invention se propose de remedier aux inconvenients mentionnes ci-dessus grace a un dispositif et un procede de controle de la The present invention proposes to remedy the drawbacks mentioned above by means of a device and a method for controlling the
recirculation des gaz d'echappement simplex, economiques et efficaces. recirculation of simplex exhaust gases, economical and efficient.
Selon ['invention, un dispositif de controle de la recirculation des gaz d'echappement d'un moteur a combustion interne, notamment d'un moteur a combustion pouvant fonctionner selon un mode de combustion homogene, comportant un turbocompresseur avec une turbine entranee en rotation par les gaz d'echappement du moteur et un compresseur delivrant au moins un fluide sous pression audit moteur, ledit dispositif comprenant un moyen de recirculation des gaz d'echappement dans le moteur, est caracterise en ce que le moyen de recirculation des gaz d'echappement relic l'aval de la turbine a According to the invention, a device for controlling the recirculation of the exhaust gases of an internal combustion engine, in particular of a combustion engine that can operate in a homogeneous combustion mode, comprising a turbocharger with a turbine driven in rotation. by the exhaust gases of the engine and a compressor delivering at least one fluid under pressure to said engine, said device comprising means for recirculating the exhaust gases in the engine, is characterized in that the means for recirculating the gases of exhaust relic downstream of the turbine a
I'amont du compresseur.The compressor's upstream.
Avantageusement, le moyen de recirculation des gaz d'echappement peut Advantageously, the exhaust gas recirculation means can
comprendre un conduit muni d'un moyen de vannage. include a conduit provided with a means of winnowing.
De maniere preferentielle, le moyen de recirculation comprend un moyen Preferably, the recirculation means comprises a means
de pompage desdits gaz.pumping said gases.
En outre, un moyen de rechauffage des gaz d'echappement peut etre In addition, a means of heating the exhaust gas can be
dispose en amont de la turbine.has upstream of the turbine.
Ce moyen de rechauffage peut comprendre un catalyseur. This reheating means may comprise a catalyst.
De plus, le dispositif peut comprendre un moyen de filtration de particules In addition, the device may comprise a particle filtration means
dispose entre le turbocompresseur et le moyen de recirculation des gaz. disposed between the turbocharger and the gas recirculation means.
Le moyen de filtration peut etre dispose entre la sortie de la turbine du turbocompresseur et le moyen de recirculation des gaz. Le moyen de filtration peut egalement etre entre le moyen de recirculation The filtration means may be provided between the outlet of the turbocharger turbine and the gas recirculation means. The filtration means may also be between the recirculation means
des gaz et ['entree du compresseur du turbocompresseur. gases and the turbocharger compressor inlet.
L'invention concerne egalement un procede de controle de la recirculation des gaz d'echappement d'un moteur a combustion interne, notamment d'un moteur a combustion homogene pouvant fonctionner selon un mode de combustion homogene, comportant un turbocompresseur avec une turbine entranee en rotation par les gaz d'echappement du moteur et un compresseur delivrant au moins un fluide sous pression audit moteur,!edit dispositif comprenant un moyen de recirculation des gaz d'echappement dans le moteur, caracterise en ce qu'on injecte une partie des gaz d'echappement sortant de la The invention also relates to a method for controlling the recirculation of the exhaust gases of an internal combustion engine, in particular a homogeneous combustion engine that can operate in a homogeneous combustion mode, comprising a turbocharger with a turbine driven by a combustion engine. rotation by the exhaust gases of the engine and a compressor delivering at least one pressurized fluid to said engine, said device comprising a means of recirculation of the exhaust gases in the engine, characterized in that one injects part of the gases exhaust coming out of the
turbine a ['entree du compresseur.turbine at the inlet of the compressor.
De maniere avantageuse, on peut injecter lesdits gaz avec un moyen de pompage. De plus, on peut rechauffer les gaz d'echappement issus du moteur avant Advantageously, said gases can be injected with a pumping means. In addition, it is possible to heat the exhaust gases from the engine before
qu'il ne traverse la turbine.that it does not cross the turbine.
On peut realiser le rechauffage des gaz d'echappement issus du moteur We can achieve the heating of the exhaust gases from the engine
par reaction catalytique.by catalytic reaction.
Preferentiellement, on peut fi ltrer l es gaz d' echappement avant leu r Preferentially, it is possible to filter the exhaust gas before
admission dans le compresseur.admission to the compressor.
Les autres caracteristiques et avantages de ['invention vont appara^tre a la The other features and advantages of the invention will appear at the
lecture de la description qui va suivre, donnee a titre illustratif et non limitatif, et reading of the description which follows, given by way of illustration and not limitation, and
a laquelle vent annexees: - la figure 1 qui montre un dispositif de controle de la recirculation des gaz d'echappement selon ['invention; - la figure 2 qui est une variante du dispositif de la figure 1; et appended to FIG. 1 which shows a device for controlling the recirculation of the exhaust gases according to the invention; - Figure 2 which is a variant of the device of Figure 1; and
- la figure 3 qui est une autre variante du dispositif de la figure 1. - Figure 3 which is another variant of the device of Figure 1.
En se reportant a la figure 1, le dispositif de controle de la recirculation des gaz d'echappement comprend un moteur a combustion interne 10, tel qu'un Referring to FIG. 1, the exhaust gas recirculation control device comprises an internal combustion engine 10, such as a
moteur de type Diesel pouvant fonctionner selon deux modes de combustion. diesel type engine that can operate in two modes of combustion.
Un de ces modes de fonctionnement est le mode traditionnel, generalement utilise pour les fortes charges du moteur, dans lequel le carburant est injecte au voisinage du point mort haut compression et la combustion se produit au fur et a mesure de cette injection. L'autre de ces modes, qui est utilise pour les autres types de charges du moteur, est le mode de combustion homogene selon lequel ie carburant est injecte pendant la phase d'admission de maniere a obtenir un melange homogene entre le carburant et le ou les fluides admis dans la chambre de combustion. La combustion de ce melange One of these modes of operation is the traditional mode, generally used for the high loads of the engine, in which the fuel is injected near the high compression dead point and the combustion occurs as and when this injection. The other of these modes, which is used for other types of engine loads, is the homogeneous combustion mode in which the fuel is injected during the intake phase so as to obtain a homogeneous mixture between the fuel and the fuel. the fluids admitted into the combustion chamber. The combustion of this mixture
se produit ensuite au voisinage de la fin de la phase de compression. then occurs near the end of the compression phase.
Ce moteur comprend au moins une chambre de combustion 12, un ! dispositif d'admission 14, tel qu'un collecteur d'admission, d'au moins un fluide dans les chambres de combustion et un dispositif d'echappement 16 des gaz brGles sortant de cette chambre, plus communement appelee collecteur d'echappement. Le dispositif comprend eg alement un moyen de compression d' au moi ns un fluide a admettre dans le moteur et dont la compression est commandee par This engine comprises at least one combustion chamber 12, one! intake device 14, such as an intake manifold, of at least one fluid in the combustion chambers and an exhaust device 16 for the brine gases exiting from this chamber, more commonly known as an exhaust manifold. The device also comprises a means of compression of the self ns a fluid to admit into the engine and whose compression is controlled by
les gaz d'echappement issus du moteur, tel qu'un turbocompresseur 18. the exhaust gases from the engine, such as a turbocharger 18.
Generalement, ce turbocompresseur comprend une turbine 20 et un Generally, this turbocharger comprises a turbine 20 and a
compresseur 22 lie a la turbine par un arbre de transmission 24. compressor 22 connected to the turbine by a transmission shaft 24.
La turbine 20 est entranee en rotation par les gaz d'echappement issus de la combustion du melange carbure dans les chambres de combustion 12 et parvenant au collecteur d'echappement 16. Ces gaz circulent ensuite dans une conduite 26 qui prend naissance a ce collecteur 16 et aboutit a la turbine 20. Apres avoir traverse cette turbine, ces The turbine 20 is rotated by the exhaust gases resulting from the combustion of the carbide mixture in the combustion chambers 12 and reaching the exhaust manifold 16. These gases then circulate in a pipe 26 which originates at this manifold 16 and ends at the turbine 20. After passing through this turbine, these
gaz d'echappement vent evacuee dans la ligne d'echappement 28. exhaust gas evacuated into the exhaust line 28.
Le compresseur 22 est alimente en air exterieur par une conduite d'alimentation 30 et permet d'injecter dans les chambres de combustion 12 un air sous pression ou un melange de fluides sous pression, denomme air de suralimentation, par une conduite d'air de suralimentation 32 qui part de la The compressor 22 is supplied with external air via a supply line 30 and makes it possible to inject into the combustion chambers 12 pressurized air or a mixture of pressurized fluids, such as supercharging air, via an air duct. overeating 32 that starts from the
sortie du compresseur et se termine au collecteur d'admission 14. compressor outlet and terminates at intake manifold 14.
Le dispositif de controle comprend egalement un moyen de recirculation des gaz d'echappement comprenant un conduit de recirculation des gaz d'echappement 34 (plus communement appele conduit d' EG R) muni d'un The control device also comprises an exhaust gas recirculation means comprising an exhaust gas recirculation duct 34 (more commonly referred to as an EG R duct) equipped with an exhaust gas recirculation duct 34.
moyen de vannage 36.winnowing means 36.
Comme mieux visible sur la figure, ce conduit d'EGR relic l'aval de la turbine 20 et l'amont du compresseur 22. Par les termes amont et aval, il est entendu les parties constitutives du dispositif qui vent situees avant ou apres ['element concerne et en considerant le sens d'ecoulement du ou des fluides comme representes sur les figures. A titre d'exemple, I'aval de la turbine est constitue par la ligne d'echappement 28 et l'amont du compresseur par la As best seen in the figure, this EGR duct relic downstream of the turbine 20 and upstream of the compressor 22. By the terms upstream and downstream, it is understood the constituent parts of the device that are located before or after [ The element concerns and considering the flow direction of the fluid or fluids as shown in the figures. For example, the downstream of the turbine is constituted by the exhaust line 28 and the upstream of the compressor by the
conduite d'alimentation 30.supply line 30.
Ainsi et comme represente sur la figure 1, le conduit 34 est raccorde par l'une de ces extremites a la ligne d'echappement 28 et a la conduite Thus, and as shown in FIG. 1, the duct 34 is connected by one of these ends to the exhaust line 28 and has the duct
d'alimentation 30 du compresseur 22 par l'autre de ces extremites. supply of the compressor 22 by the other of these ends.
Le dispositif comprend encore un moyen de rechauffage 38 des gaz d'echappement sortant du moteur et qui est constitue, dans l'exemple de realisation, par le moyen de depollution des gaz d'echappement, tel qu'un catalyseur d'oxydation, que comporte habituellement un tel moteur. Ce catalyseur est place en amont de la turbine 20 et plus precisement sur la conduite d'alimentation 26 de cette turbine entre le collecteur d'echappement The device also comprises a means 38 for heating the exhaust gases leaving the engine and which is constituted, in the exemplary embodiment, by the exhaust gas depollution means, such as an oxidation catalyst, which usually has such a motor. This catalyst is placed upstream of the turbine 20 and more precisely on the supply line 26 of this turbine between the exhaust manifold
16 et ['entree de la turbine.16 and the inlet of the turbine.
Ainsi, en fonctionnement, les gaz d'echappement issus du moteur Thus, in operation, the exhaust gases from the engine
circulent dans la conduite 26 et traversent, dans leur totalite, le catalyseur 38. circulate in the pipe 26 and through, in their entirety, the catalyst 38.
Les polluants qu'ils vehiculent sont, en grande partie, elimines par reaction catalytique avec les elements que portent ce catalyseur et, grace a cette The pollutants they transport are, for the most part, removed by catalytic reaction with the elements carried by this catalyst and, thanks to this
reaction catalytique, la temperature des gaz d'echappement est augmentee. catalytic reaction, the temperature of the exhaust gas is increased.
De ce fait, les gaz d'echappement parviennent a la turbine a une temperature adequate et avec une quantite suffisante pour entraner cette As a result, the exhaust gases reach the turbine at an adequate temperature and with a sufficient quantity to drive this
turbine a une vitesse souhaitee.turbine has a desired speed.
En outre, la temperature des gaz traversant le catalyseur augmente et il est plus facile d'atteindre la temperature de << light off >> de ce catalyseur sur In addition, the temperature of the gas passing through the catalyst increases and it is easier to reach the temperature of << light off >> of this catalyst on
une large plage de fonctionnement.a wide operating range.
Une fois que ces gaz ont traverse la turbine, ceux-ci vent evacuee par la Once these gases have passed through the turbine, they are evacuated by the
ligne d'echappement 28.exhaust line 28.
Lorsque le moteur fonctionne en mode de combustion homogene, une grande partie des gaz d'echappement circulant dans cette ligne est device vers le conduit d'EGR 34 par l'ouverture du moyen de vannage 36 et aboutit a la conduite d'alimentation 30 pour y etre melangee avec l'air frais circulant dans When the engine is operating in a homogeneous combustion mode, a large part of the exhaust gas flowing in this line is passed to the EGR duct 34 through the opening of the valve means 36 and leads to the supply line 30 for the engine. to be mixed with the fresh air circulating in
cette conduite.this conduct.
Ce melange d'air et de gaz d'echappement est ensuite introduit dans le compresseur 22 puis est comprime par ce compresseur pour etre injecte, sous pression, par la conduite d'air de suralimentation 32 dans le collecteur d'admission 14 et par consequent dans les chambres de combustion 12 du moteur. La pression de cet air de suralimentation est obtenue a une valeur donnee et dans un temps determine par le fait que la turbine 20 est entranee a la This mixture of air and exhaust gas is then introduced into the compressor 22 and is compressed by this compressor to be injected, under pressure, by the supercharging air pipe 32 into the intake manifold 14 and consequently in the combustion chambers 12 of the engine. The pressure of this supercharging air is obtained at a given value and in a time determined by the fact that the turbine 20 is driven to the
vitesse requise pour obtenir une telle pression en sortie du compresseur. speed required to obtain such a pressure at the outlet of the compressor.
On se reporte maintenant a la figure 2 qui montre une variante de la figure Referring now to Figure 2 which shows a variant of the figure
1 et qui, pour cela, comporte les memes references. 1 and which, for that, includes the same references.
Cette figure 2 se distingue de la figure 1 par le fait qu'il est prevu un moyen de filtration 40 des particules contenues dans les gaz d'echappement This Figure 2 differs from Figure 1 in that it is expected a filtration means 40 of the particles contained in the exhaust gas
avant que ces gaz ne soient admis dans le compresseur 22. before these gases are admitted into the compressor 22.
Plus precisement, ce moyen de filtration est dispose entre le More precisely, this means of filtration is disposed between the
turbocompresseur 18 et le conduit d'EGR 34. turbocharger 18 and the EGR duct 34.
A titre d'exemple, ce moyen est un filtre a particules 40 et est dispose, soit sur la ligne 28 entre la sortie de la turbine 20 et le conduit d'EGR 34, soit sur la conduite d'alimentation 30 du compresseur 22 entre le conduit d'EGR 34 et By way of example, this means is a particulate filter 40 and is disposed either on the line 28 between the outlet of the turbine 20 and the EGR duct 34, or on the supply duct 30 of the compressor 22 between the EGR 34 duct and
['entree de ce compresseur.[entry of this compressor.
- Cette disposition permet d'eliminer une tres grande partie des particules contenues dans les gaz d'echappement avant leur introduction dans le compresseur. C'est un avantage non negligeable car le compresseur est entrane en rotation a de tres grande vitesse (de ltordre de plusieurs dizaines de milkers de tours par minute) et les particules qui penetrent dans la cavite de compression peuvent endommager la partie active de ce compresseur, telle que les ailettes This arrangement makes it possible to eliminate a very large part of the particles contained in the exhaust gases before they are introduced into the compressor. This is a significant advantage because the compressor is rotated at very high speed (in the order of several tens of milliseconds per minute) and particles entering the compression cavity can damage the active part of this compressor. , such as the fins
du rotor.of the rotor.
Dans la variante de la figure 3, un moyen de pompage 42, telle qu'une pompe a ailettes entranee par un moteur electrique, est disposee sur le conduit EGR 34 de maniere a introduire a 1'entree du compresseur 22, avec un debit In the variant of FIG. 3, a pumping means 42, such as a fin pump driven by an electric motor, is arranged on the EGR duct 34 so as to introduce at the inlet of the compressor 22, with a flow rate
eleve, les gaz issus de la turbine 20. high, the gases from the turbine 20.
Ce moyen de pompage permet d'eviter d'utiliser un conduit d'EGR 34 de diametre trop grand qui est necessaire du fait de la faible difference de pression This pumping means makes it possible to avoid using an EGR duct 34 of too large a diameter which is necessary because of the small difference in pressure.
entre la ligne d'echappement 28 et la conduite d'alimentation 30. between the exhaust line 28 and the supply line 30.
Grace a ce moyen de pompage, il est ainsi possible de faire circuler, apres ouverture de la vanne 36, une grande quantite de gaz d'echappement dans un delai court sans apporter de modification significative dans les dimensions du Thanks to this pumping means, it is thus possible to circulate, after opening the valve 36, a large amount of exhaust gas in a short time without making any significant change in the dimensions of the
conduit 34.leads 34.
La presente invention n'epas limitee aux exemples de realisation decrits The present invention is not limited to the embodiments described
mais englobe toutes les varintes.but encompasses all the varintes.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0207172A FR2840648B1 (en) | 2002-06-11 | 2002-06-11 | DEVICE AND METHOD FOR CONTROLLING EXHAUST GAS RECIRCULATION FOR AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR OF THE DIESEL TYPE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0207172A FR2840648B1 (en) | 2002-06-11 | 2002-06-11 | DEVICE AND METHOD FOR CONTROLLING EXHAUST GAS RECIRCULATION FOR AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR OF THE DIESEL TYPE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2840648A1 true FR2840648A1 (en) | 2003-12-12 |
| FR2840648B1 FR2840648B1 (en) | 2006-08-04 |
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| FR0207172A Expired - Fee Related FR2840648B1 (en) | 2002-06-11 | 2002-06-11 | DEVICE AND METHOD FOR CONTROLLING EXHAUST GAS RECIRCULATION FOR AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR OF THE DIESEL TYPE |
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| FR (1) | FR2840648B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1870590A1 (en) * | 2006-06-22 | 2007-12-26 | C.R.F. Società Consortile per Azioni | Internal combustion engine with a pump for exhaust gas recirculation |
| EP1672208A3 (en) * | 2004-12-18 | 2011-06-22 | Pierburg GmbH | Exhaust gas recirculation system |
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| EP1672208A3 (en) * | 2004-12-18 | 2011-06-22 | Pierburg GmbH | Exhaust gas recirculation system |
| EP1870590A1 (en) * | 2006-06-22 | 2007-12-26 | C.R.F. Società Consortile per Azioni | Internal combustion engine with a pump for exhaust gas recirculation |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2840648B1 (en) | 2006-08-04 |
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