EP3532717A2 - Air intake circuit for a supercharged engine - Google Patents

Air intake circuit for a supercharged engine

Info

Publication number
EP3532717A2
EP3532717A2 EP17800906.4A EP17800906A EP3532717A2 EP 3532717 A2 EP3532717 A2 EP 3532717A2 EP 17800906 A EP17800906 A EP 17800906A EP 3532717 A2 EP3532717 A2 EP 3532717A2
Authority
EP
European Patent Office
Prior art keywords
branches
compressor
circuit
intake circuit
intake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17800906.4A
Other languages
German (de)
French (fr)
Inventor
Nicolas LHERAUD
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP3532717A2 publication Critical patent/EP3532717A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F02B37/12—Control of the pumps
    • F02B37/16—Control of the pumps by bypassing charging air
    • 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
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • 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
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1244—Intake silencers ; Sound modulation, transmission or amplification using interference; Masking or reflecting sound
    • 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 invention relates to an air intake circuit of a supercharged engine.
  • the application FR2986274 describes a method for controlling a supercharging performed by means of an engine architecture comprising a compressor coupled to a turbine, an intake manifold and a bypass circuit of said compressor controlled by a valve. discharge circuit, said circuit for deflecting a portion of the supercharged gas downstream of the compressor to an area upstream of said compressor.
  • a method for controlling a supercharging performed by means of an engine architecture comprising a compressor coupled to a turbine, an intake manifold and a bypass circuit of said compressor controlled by a valve. discharge circuit, said circuit for deflecting a portion of the supercharged gas downstream of the compressor to an area upstream of said compressor.
  • An air intake circuit of a supercharged engine according to the invention makes it possible to attenuate or even cancel, at its source, the noise emitted by the discharge valve, in particular by avoiding the drawbacks noted in FIG. state of the art.
  • the invention relates to an air intake circuit of a supercharged engine engine comprising a compressor placed in said circuit and a bypass circuit comprising a discharge valve and for conveying compressed gases downstream of the compressor. to an area of the intake line upstream of said compressor.
  • the main characteristic of an air intake according to the invention is that a section of the branch circuit between the discharge valve and said zone comprises at least two branches capable of conveying the gases to the zone, said branches being implanted in a duct delimiting said zone.
  • the gas flows from the various branches that are in communication with the duct defining the zone penetrate both in said duct and in the other branches, significantly limiting the amount of gas brought up in said duct.
  • the noise produced in said duct and caused by the opening of the valve is greatly reduced. Indeed, some of this noise is discharged at these branches, greatly reducing the noise back into the intake circuit to the intake inlet.
  • the conduit may for example be constituted by a cylindrical tube and the branches may for example be constituted by cylindrical tubes.
  • the engine of the vehicle is a heat engine that can for example be gasoline or diesel.
  • the branch circuit is a circuit connected in parallel with the main air intake circuit. It is assumed for example that the compressor is coupled to a turbine placed on an exhaust line, to form a turbocharger. Alternatively, the compressor may also be an electric compressor.
  • the branch circuit section comprises an even number of branches, the branches being implanted in the conduit so as to form pairs of branches facing each other around said conduit. Indeed, so that noise attenuation is optimized, each branch is located in the conduit so as to be in front of another branch. In this way, a larger fraction of gas from a branch will enter the branch opposite. Two branches are supposed to be opposite each other if their longitudinal axes, or neutral fibers, are aligned and merged.
  • the gas passage section in each of the branches is less than the passage section of the gas in the conduit.
  • the passage sections of the gases in the branches are identical.
  • the duct is cylindrical, the section of the branch circuit comprising two branches implanted in said duct diametrically opposite. This is a simple configuration limiting the number of branches implanted in the conduit, and greatly reducing the noise produced by the opening of the discharge valve.
  • the gas passage section in each of the branches is substantially equal to half of the passage section of the section if it consisted of a single branch.
  • each branch ends with a rectilinear segment implanted in the conduit.
  • the gases will tend to penetrate the duct without being disturbed by vortex movements, facilitating the penetration of gases in the branch opposite.
  • the length of the rectilinear segment is between 2 times and 5 times its internal diameter. This ratio makes it possible to obtain a optimized length of each branch according to its internal diameter to obtain a rectilinear and undisturbed gas outlet in the conduit.
  • the discharge valve is deported, the bypass circuit being distinct from the compressor.
  • the bypass circuit comprising the discharge valve is independent of the compressor and can therefore be mounted separately therefrom.
  • the discharge valve is integrated in a crankcase of the compressor.
  • the position of the discharge valve is fixed relative to that of the compressor, allowing good reproducibility of mounting an intake line according to the invention.
  • An intake circuit according to the invention has the advantage of being particularly effective, by attenuating the noise produced by the opening of the discharge valve from its source, by means of an original geometry of the branch circuit comprising said .
  • a consequence of this advantage is that such an admission circuit is of simple design and space-saving, avoiding in particular to implement large means and demanding good mounting accuracy, to counteract the noise once it- it was created.
  • FIG. 1 is a schematic view of the architecture of a state-of-the-art internal combustion engine, comprising a turbocharger and a bypass circuit comprising a discharge valve,
  • FIG. 2A is a side view of a compressor and a bypass circuit of an intake circuit according to the invention
  • FIG. 2B is a view at another angle of the compressor and the branch circuit of FIG. 2A
  • FIG. 3 is an enlarged schematic view of the connection zone between a bypass circuit and an intake duct of an intake circuit according to the invention
  • FIG. 4A is a schematic and partial view of a first embodiment of an intake circuit according to the invention.
  • FIG. 4B is a schematic and partial view of a second embodiment of an intake circuit according to the invention.
  • an example of an internal combustion engine structure 1 involving a turbocharger 2 comprises an air inlet 3, an air filter 4, a duct 30 for conveying air to the compressor. 5, then a pipe 6 connecting said compressor 5 to an intake manifold 7 placed upstream of the engine 8, for conveying supercharged air to said engine 8, via a supercharged air cooler 9 (RAS).
  • RAS supercharged air cooler
  • the exhaust gases leave the engine 8 via an exhaust manifold 10, which convey said burnt gases to the turbine 11 by means of a connecting pipe 12, the air leaving the turbine 11 being directed to a catalyst 13 before being discharged to the outside of the vehicle.
  • the supercharged air flow is regulated in the pipe 6 via a valve, which can be advantageously constituted by a throttle body 14 placed between the cooler 9 and the intake manifold 7.
  • the throttle body 14 comprises a valve 17 pivoting regulation, which can be opened or closed according to the phases of use of the engine.
  • the exhaust gas can be directly sent to the catalyst 13, without passing through the turbine 11, by means of a bypass 15 equipped with a valve type discharge valve 16, said valve 16 being biased to regulate the flow of gas passing through the bypass 15, and therefore, consequently, the flow of gas passing through the turbine 11.
  • This engine structure 1 also includes a branch 18 at compressor 5, for conveying supercharged air from a downstream zone of said compressor 5 located upstream of the throttle body 14, to an upstream zone of the compressor 5 located downstream of the air filter 4.
  • the flow of air passing through this branch 18 is controlled by means of a discharge valve 19, for example a pneumatic or electric valve, placed in said bypass 18.
  • This bypass 18 at the compressor 5, when it is open, makes it possible to lower the pressure supercharged gases produced in the pipe 6 by the compressor 5, evacuating a portion of these gases.
  • This engine structure 1 here has a first supercharged air pressure sensor 20 located between the RAS 9 and the throttle body 14, and a second sensor 21 placed in the intake manifold 7, the pressure measurements. acquired by these two sensors 20,21 dictating the configuration of the throttle body 14 as well as that of the discharge valve 19.
  • the intake circuit comprises all the elements between the air inlet 3 and the intake manifold 7, itself being assumed to be included in said circuit.
  • the branch 18 comprising the discharge valve 19 has an upstream section 22 connecting a conduit 23 of the intake circuit situated downstream of the compressor 5 to a cavity 24 enclosing the discharge valve 19, and a downstream section 25 connecting said cavity 24 to a duct 26 of the intake circuit located upstream of said compressor 5.
  • This downstream section 24 here divides into two branches 27, 28 each connecting the cavity 24 to said upstream duct 26.
  • the cavity 24 containing the discharge valve 19 and the upstream conduit 26 are cylindrical, and the two branches 27, 28 are implanted in said cavity 24 diametrically opposite and are located in said upstream conduit 26 diametrically opposite.
  • Each branch 27, 28 thus comprises a first rectilinear segment 29 implanted in the cavity 24, extended by a second curved segment 30 itself extended by a third rectilinear segment 31 opening into the upstream conduit 26, said first segment 29 and said third segment 31 being here parallel.
  • each branch can have a profile in C-shaped or U-shaped.
  • Each of the two branches 27, 28 is composed of a cylindrical pipe connecting the cavity 24 to the upstream pipe 26, the two branches 27, 28 having the same diameter.
  • the length of the third segment 31 is greater than or equal to three times its diameter to allow the gas flowing in the branch 27, 28 to open into the upstream duct 26 without being disturbed.
  • the compressed gases in the pipe 23 located downstream of the compressor 5, can be discharged to the upstream pipe 26, via the bypass 18 by means of an opening of the discharge valve 19.
  • the gases thus pass first through the section upstream 22 of the branch 18, then through the cavity 24 housing the discharge valve 19.
  • said gases then progress in the two branches 27, 28 to open into the upstream duct 26 of the intake circuit. Due to the particular arrangement of the arrival of these two branches 27, 28 in the upstream channel 26, namely being diametrically opposed, a fraction of the gases from one of the two branches 27, 28 and opening into the channel upstream 26, will rush into the branch 27, 28 located in front, thereby reducing the fraction of gas brought up in said upstream channel 26 to the air inlet 3. This phenomenon is reciprocal with the other branch 27 , 28 and therefore benefits the two branches 27, 28.
  • the discharge valve 19 is offset so that the bypass 18 is external to the compressor 5.
  • the compressor 5 and the bypass 18 are two independent elements that must be mounted separately, respecting a certain rigor and a certain precision.
  • the discharge valve 19 is integrated in a housing 32 of the compressor 5. For this configuration, the compressor 5 and the discharge valve 19 are combined to form a compact assembly easy to assemble.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Abstract

The invention relates to an air intake circuit for a supercharged vehicle engine, comprising a compressor (5) located in said circuit and a bypass circuit (18) comprising a discharge valve (19) and delivering compressed gases, downstream of the compressor (5), to an area (26) of the intake line located upstream of the compressor (5). The main feature of an intake circuit according to the invention is that the segment (25) of the bypass circuit (18) between the discharge valve (19) and the area (26) comprises at least two branches (27, 28) for conveying the gases to the area (26), said branches (27, 28) being implanted in a pipe (26) delimiting said area.

Description

CIRCUIT D'ADMISSION D'AIR D'UN MOTEUR SURALIMENTE  AIR INTAKE CIRCUIT OF A SUPERCHARGED ENGINE
L'invention se rapporte à un circuit d'admission d'air d'un moteur suralimenté. The invention relates to an air intake circuit of a supercharged engine.
Sur un moteur thermique suralimenté à allumage commandé, il est nécessaire de faire chuter rapidement la surpression en aval d'un compresseur de suralimentation à chaque fermeture du boîtier papillon. On fait chuter la pression pour un besoin de fiabilité de la roue de compresseur. Pour cela, certains moteurs peuvent utiliser une vanne de décharge située en aval du compresseur, qui renvoie l'air à l'entrée du compresseur.  On a supercharged engine with positive ignition, it is necessary to quickly drop the overpressure downstream of a supercharger at each closure of the throttle body. The pressure is lowered for a need for reliability of the compressor wheel. For this, some engines may use a discharge valve located downstream of the compressor, which returns air to the compressor inlet.
A titre d'exemple, la demande FR2986274 décrit un procédé de pilotage d'une suralimentation réalisée au moyen d'une architecture moteur comprenant un compresseur couplé à une turbine, un collecteur d'admission et un circuit de dérivation dudit compresseur contrôlé par une vanne de décharge, ledit circuit permettant de dévier une partie des gaz suralimentés en aval du compresseur vers une zone située en amont dudit compresseur. Un tel procédé permet de déterminer les conditions d'ouverture de la vanne de décharge.  By way of example, the application FR2986274 describes a method for controlling a supercharging performed by means of an engine architecture comprising a compressor coupled to a turbine, an intake manifold and a bypass circuit of said compressor controlled by a valve. discharge circuit, said circuit for deflecting a portion of the supercharged gas downstream of the compressor to an area upstream of said compressor. Such a method makes it possible to determine the conditions for opening the discharge valve.
Or, de façon générale, lorsqu'il décidé d'ouvrir la vanne de décharge, un bruit inacceptable est produit à l'ouverture de celle-ci, par recirculation de l'air compressé dans le tronçon à basse pression du circuit d'admission d'air. Ce bruit remonte ensuite l'ensemble du circuit d'admission à basse pression, avant d'être rayonné par la bouche d'admission, puis transmis jusqu'à l'habitacle.  However, in general, when it decides to open the discharge valve, an unacceptable noise is produced at the opening thereof, by recirculation of the compressed air in the low pressure section of the intake circuit air. This noise then goes up the entire intake circuit at low pressure, before being radiated by the intake port, and transmitted to the passenger compartment.
Pour résoudre ce problème de bruit, les applications actuelles ou antérieures utilisent des artifices acoustiques traditionnels entre la source et la bouche d'admission d'air, comme par exemple les résonateurs de Helmholtz, les quarts d'onde, les mousses, ou les conduits poreux. Mais tous ces artifices permettent juste d'atténuer le bruit sans empêcher celui-ci de se produire, et nécessitent de plus une implantation rigoureuse et précise pour être réellement efficaces. Ces artifices sont des solutions coûteuses et encombrantes dans le compartiment moteur des véhicules automobiles. Un circuit d'admission d'air d'un moteur suralimenté selon l'invention, permet d'atténuer, voire d'annuler, à sa source le bruit émis par la vanne de décharge, en s'affranchissant notamment des inconvénients relevés dans l'état de la technique. To solve this noise problem, current or earlier applications use traditional acoustic devices between the source and the air inlet, such as Helmholtz resonators, quarter-waves, foams, or ducts. porous. But all these devices can just mitigate the noise without preventing it from occurring, and require more rigorous and precise implementation to be really effective. These devices are expensive and cumbersome solutions in the engine compartment of motor vehicles. An air intake circuit of a supercharged engine according to the invention makes it possible to attenuate or even cancel, at its source, the noise emitted by the discharge valve, in particular by avoiding the drawbacks noted in FIG. state of the art.
Pour une bonne compréhension de l'invention les notions de « dérivation » et « circuit de dérivation » sont équivalentes.  For a good understanding of the invention the concepts of "derivation" and "branch circuit" are equivalent.
L'invention a pour objet un circuit d'admission d'air d'un moteur de véhicule suralimenté comprenant un compresseur placé dans ledit circuit et un circuit de dérivation comprenant une vanne de décharge et permettant d'acheminer des gaz comprimés en aval du compresseur vers une zone de la ligne d'admission située en amont dudit compresseur.  The invention relates to an air intake circuit of a supercharged engine engine comprising a compressor placed in said circuit and a bypass circuit comprising a discharge valve and for conveying compressed gases downstream of the compressor. to an area of the intake line upstream of said compressor.
La principale caractéristique d'un d'admission d'air selon l'invention, est qu'un tronçon du circuit de dérivation compris entre la vanne de décharge et ladite zone comprend au moins deux branches aptes à acheminer les gaz vers la zone, lesdites branches étant implantées dans un conduit délimitant ladite zone. De cette manière, les flux gazeux issus des différentes branches qui sont en communication avec le conduit délimitant la zone, pénètrent à la fois dans ledit conduit et dans les autres branches, limitant significativement la quantité de gaz amenée à remonter dans ledit conduit. De cette manière, le bruit produit dans ledit conduit et provoqué par l'ouverture de la vanne, est grandement réduit. En effet, une partie de ce bruit est évacué au niveau de ces branches, atténuant grandement le bruit remontant dans le circuit d'admission jusqu'à l'entrée d'admission. Le conduit peut par exemple être constitué par un tube cylindrique et les branches peuvent par exemple être constituées par des tubulures cylindriques. Le moteur du véhicule est un moteur thermique pouvant par exemple être à essence ou diesel . Le circuit de dérivation est un circuit monté en parallèle sur le circuit principal d'admission d'air. Il est supposé par exemple que le compresseur est couplé à une turbine placé sur une ligne d'échappement, pour former un turbocompresseur. En variante, le compresseur peut aussi être un compresseur électrique. Avantageusement, le tronçon du circuit de dérivation comprend un nombre pair de branches, les branches étant implantées dans le conduit de manière à constituer des paires de branches se faisant face autour dudit conduit. En effet, afin que l'atténuation du bruit soit optimisée, chaque branche est implantée dans le conduit de façon à se retrouver en face d'une autre branche. De cette manière, une fraction plus importante de gaz issu d'une branche va pénétrer dans la branche située en face. Deux branches sont supposées être situées l'une en face de l'autre si leurs axes longitudinaux, ou fibres neutres, sont alignés et confondus. De façon préférentielle, la section de passage des gaz dans chacune des branches est inférieure à la section de passage des gaz dans le conduit. The main characteristic of an air intake according to the invention is that a section of the branch circuit between the discharge valve and said zone comprises at least two branches capable of conveying the gases to the zone, said branches being implanted in a duct delimiting said zone. In this way, the gas flows from the various branches that are in communication with the duct defining the zone, penetrate both in said duct and in the other branches, significantly limiting the amount of gas brought up in said duct. In this way, the noise produced in said duct and caused by the opening of the valve, is greatly reduced. Indeed, some of this noise is discharged at these branches, greatly reducing the noise back into the intake circuit to the intake inlet. The conduit may for example be constituted by a cylindrical tube and the branches may for example be constituted by cylindrical tubes. The engine of the vehicle is a heat engine that can for example be gasoline or diesel. The branch circuit is a circuit connected in parallel with the main air intake circuit. It is assumed for example that the compressor is coupled to a turbine placed on an exhaust line, to form a turbocharger. Alternatively, the compressor may also be an electric compressor. Advantageously, the branch circuit section comprises an even number of branches, the branches being implanted in the conduit so as to form pairs of branches facing each other around said conduit. Indeed, so that noise attenuation is optimized, each branch is located in the conduit so as to be in front of another branch. In this way, a larger fraction of gas from a branch will enter the branch opposite. Two branches are supposed to be opposite each other if their longitudinal axes, or neutral fibers, are aligned and merged. Preferably, the gas passage section in each of the branches is less than the passage section of the gas in the conduit.
Préférentiellement, les sections de passage des gaz dans les branches sont identiques. Preferably, the passage sections of the gases in the branches are identical.
De façon avantageuse, le conduit est cylindrique, le tronçon du circuit de dérivation comprenant deux branches implantées dans ledit conduit de façon diamétralement opposée. Il s'agit d'une configuration simple limitant le nombre de branches implantées dans le conduit, et permettant de diminuer grandement le bruit produit par l'ouverture de la vanne de décharge. Advantageously, the duct is cylindrical, the section of the branch circuit comprising two branches implanted in said duct diametrically opposite. This is a simple configuration limiting the number of branches implanted in the conduit, and greatly reducing the noise produced by the opening of the discharge valve.
Avantageusement, la section de passage des gaz dans chacune des branches est sensiblement égale à la moitié de la section de passage du tronçon s'il était constitué d'une seule branche. Advantageously, the gas passage section in each of the branches is substantially equal to half of the passage section of the section if it consisted of a single branch.
De façon préférentielle, chaque branche se termine par un segment rectiligne implanté dans le conduit. De cette manière, les gaz vont avoir tendance à pénétrer dans le conduit sans être perturbés par des mouvements tourbillonnaires, facilitant la pénétration des gaz dans la branche située en face. Preferably, each branch ends with a rectilinear segment implanted in the conduit. In this way, the gases will tend to penetrate the duct without being disturbed by vortex movements, facilitating the penetration of gases in the branch opposite.
Préférentiellement, la longueur du segment rectiligne est comprise entre 2 fois et 5 fois son diamètre interne. Ce ratio permet d'obtenir une longueur optimisée de chaque branche en fonction de son diamètre interne pour obtenir une sortie des gaz rectiligne et non perturbée dans le conduit. Preferably, the length of the rectilinear segment is between 2 times and 5 times its internal diameter. This ratio makes it possible to obtain a optimized length of each branch according to its internal diameter to obtain a rectilinear and undisturbed gas outlet in the conduit.
Selon un premier mode de réalisation préféré d'un circuit d'admission selon l'invention, la vanne de décharge est déportée, le circuit de dérivation étant distinct du compresseur. De cette manière, le circuit de dérivation comprenant la vanne de décharge est indépendant du compresseur et peut donc être monté séparément de celui-ci. According to a first preferred embodiment of an intake circuit according to the invention, the discharge valve is deported, the bypass circuit being distinct from the compressor. In this way, the bypass circuit comprising the discharge valve is independent of the compressor and can therefore be mounted separately therefrom.
Selon un autre mode de réalisation préféré d'un circuit d'admission selon l'invention, la vanne de décharge est intégrée dans un carter du compresseur. Pour cette configuration, la position de la vanne de décharge est figée par rapport à celle du compresseur, permettant une bonne reproductibilité de montage d'une ligne d'admission selon l'invention. According to another preferred embodiment of an intake circuit according to the invention, the discharge valve is integrated in a crankcase of the compressor. For this configuration, the position of the discharge valve is fixed relative to that of the compressor, allowing good reproducibility of mounting an intake line according to the invention.
Un circuit d'admission selon l'invention présente l'avantage d'être particulièrement efficace, en atténuant le bruit produit par l'ouverture de la vanne de décharge dès sa source, au moyen d'une géométrie originale du circuit de dérivation comprenant ladite. Une conséquence de cet avantage est qu'un tel circuit d'admission est de conception simple et peu encombrante, en évitant notamment de mettre en œuvre des moyens volumineux et réclamant une bonne précision de montage, pour venir contrecarrer le bruit une fois que celui-ci a été créé. An intake circuit according to the invention has the advantage of being particularly effective, by attenuating the noise produced by the opening of the discharge valve from its source, by means of an original geometry of the branch circuit comprising said . A consequence of this advantage is that such an admission circuit is of simple design and space-saving, avoiding in particular to implement large means and demanding good mounting accuracy, to counteract the noise once it- it was created.
On donne ci-après une description détaillée d'un mode de réalisation préféré d'un circuit d'admission selon l'invention, en se référant aux figures suivantes, The following is a detailed description of a preferred embodiment of an intake circuit according to the invention, with reference to the following figures,
- La figure 1 est une vue schématique de l'architecture d'un moteur à combustion interne de l'état de la technique, comprenant un turbocompresseur ainsi qu'un circuit de dérivation comprenant une vanne de décharge, FIG. 1 is a schematic view of the architecture of a state-of-the-art internal combustion engine, comprising a turbocharger and a bypass circuit comprising a discharge valve,
- La figure 2A est une vue de côté d'un compresseur et d'un circuit de dérivation d'un circuit d'admission selon l'invention, - La figure 2B est une vue sous un autre angle du compresseur et du circuit de dérivation de la figure 2A, FIG. 2A is a side view of a compressor and a bypass circuit of an intake circuit according to the invention, FIG. 2B is a view at another angle of the compressor and the branch circuit of FIG. 2A,
- La figure 3 est une vue schématique agrandie de la zone de raccordement entre un circuit de dérivation et un conduit d'admission d'un circuit d'admission selon l'invention, FIG. 3 is an enlarged schematic view of the connection zone between a bypass circuit and an intake duct of an intake circuit according to the invention,
- La figure 4A est une vue schématique et partielle d'un premier mode de réalisation d'un circuit d'admission selon l'invention, FIG. 4A is a schematic and partial view of a first embodiment of an intake circuit according to the invention,
La figure 4B est une vue schématique et partielle d'un deuxième mode de réalisation d'un circuit d'admission selon l'invention. En se référant à la figure 1, un exemple de structure de moteur 1 à combustion interne impliquant un turbocompresseur 2, comprend une entrée d'air 3, un filtre à air 4, un conduit d'acheminement 30 de l'air vers le compresseur 5, puis une canalisation 6 reliant ledit compresseur 5 à un collecteur d'admission 7 placé en amont du moteur 8, pour convoyer de l'air suralimenté vers ledit moteur 8, en passant par un refroidisseur d'air suralimenté 9 (RAS). Les gaz d'échappement sortent du moteur 8 par l'intermédiaire d'un collecteur d'échappement 10, qui acheminent lesdits gaz brûlés vers la turbine 11 au moyen d'une conduite 12 de liaison, l'air en sortie de turbine 11 étant orientés vers un catalyseur 13 avant d'être évacués vers l'extérieur du véhicule. Le flux d'air suralimenté est régulé dans la canalisation 6 par l'intermédiaire d'une vanne, pouvant être avantageusement constituée par un boîtier papillon 14 placé entre le refroidisseur 9 et le collecteur d'admission 7. Le boîtier papillon 14 comporte un clapet 17 de régulation pivotant, pouvant s'ouvrir ou se fermer selon les phases d'utilisation du moteur. Les gaz d'échappement peuvent être directement envoyés vers le catalyseur 13, sans passer par la turbine 11, au moyen d'une dérivation 15 équipée d'une vanne de type soupape de décharge 16, ladite vanne 16 étant sollicitée pour réguler le flux de gaz passant par la dérivation 15, et donc, par voie de conséquence, le flux de gaz passant par la turbine 11. FIG. 4B is a schematic and partial view of a second embodiment of an intake circuit according to the invention. Referring to FIG. 1, an example of an internal combustion engine structure 1 involving a turbocharger 2 comprises an air inlet 3, an air filter 4, a duct 30 for conveying air to the compressor. 5, then a pipe 6 connecting said compressor 5 to an intake manifold 7 placed upstream of the engine 8, for conveying supercharged air to said engine 8, via a supercharged air cooler 9 (RAS). The exhaust gases leave the engine 8 via an exhaust manifold 10, which convey said burnt gases to the turbine 11 by means of a connecting pipe 12, the air leaving the turbine 11 being directed to a catalyst 13 before being discharged to the outside of the vehicle. The supercharged air flow is regulated in the pipe 6 via a valve, which can be advantageously constituted by a throttle body 14 placed between the cooler 9 and the intake manifold 7. The throttle body 14 comprises a valve 17 pivoting regulation, which can be opened or closed according to the phases of use of the engine. The exhaust gas can be directly sent to the catalyst 13, without passing through the turbine 11, by means of a bypass 15 equipped with a valve type discharge valve 16, said valve 16 being biased to regulate the flow of gas passing through the bypass 15, and therefore, consequently, the flow of gas passing through the turbine 11.
Cette structure de moteur 1 comprend également une dérivation 18 au niveau du compresseur 5, pour acheminer de l'air suralimenté depuis une zone aval dudit compresseur 5 située en amont du boîtier papillon 14, vers une zone amont du compresseur 5 située en aval du filtre à air 4. Le flux d'air passant par cette dérivation 18 est piloté au moyen d'une vanne de décharge 19, par exemple une vanne pneumatique ou électrique, placée dans ladite dérivation 18. Cette dérivation 18 au niveau du compresseur 5, lorsqu'elle est ouverte, permet de faire baisser la pression des gaz suralimentés produits dans la canalisation 6 par le compresseur 5, en évacuant une partie de ces gaz. Cette structure de moteur 1 dispose ici d'un premier capteur de pression 20 d'air suralimenté situé entre le RAS 9 et le boîtier 14 papillon, et d'un deuxième capteur 21 placé dans le collecteur d'admission 7, les mesures de pression acquises par ces deux capteurs 20,21 dictant la configuration du boîtier papillon 14 ainsi que celle de la vanne de décharge 19. This engine structure 1 also includes a branch 18 at compressor 5, for conveying supercharged air from a downstream zone of said compressor 5 located upstream of the throttle body 14, to an upstream zone of the compressor 5 located downstream of the air filter 4. The flow of air passing through this branch 18 is controlled by means of a discharge valve 19, for example a pneumatic or electric valve, placed in said bypass 18. This bypass 18 at the compressor 5, when it is open, makes it possible to lower the pressure supercharged gases produced in the pipe 6 by the compressor 5, evacuating a portion of these gases. This engine structure 1 here has a first supercharged air pressure sensor 20 located between the RAS 9 and the throttle body 14, and a second sensor 21 placed in the intake manifold 7, the pressure measurements. acquired by these two sensors 20,21 dictating the configuration of the throttle body 14 as well as that of the discharge valve 19.
Le circuit d'admission comprend tous les éléments compris entre l'entrée d'air 3 et le collecteur d'admission 7, lui-même étant supposé être inclus dans ledit circuit. The intake circuit comprises all the elements between the air inlet 3 and the intake manifold 7, itself being assumed to be included in said circuit.
En se référant aux figures 2A et 2B, la dérivation 18 comprenant la vanne de décharge 19 présente un tronçon amont 22 reliant un conduit 23 du circuit d'admission situé en aval du compresseur 5 à une cavité 24 enfermant la vanne 19 de décharge, et un tronçon aval 25 reliant ladite cavité 24 à un conduit 26 du circuit d'admission situé en amont dudit compresseur 5. Ce tronçon aval 24 se divise ici en deux branches 27, 28 reliant chacune la cavité 24 audit conduit amont 26. La cavité 24 contenant la vanne 19 de décharge et le conduit amont 26 sont cylindriques, et les deux branches 27, 28 sont implantées dans ladite cavité 24 de façon diamétralement opposée et sont implantées dans ledit conduit amont 26 de façon diamétralement opposée. Chaque branche 27, 28 comprend ainsi un premier segment rectiligne 29 implanté dans la cavité 24, prolongé par un deuxième segment incurvé 30 lui- même prolongé par un troisième segment 31 rectiligne débouchant dans le conduit amont 26, ledit premier segment 29 et ledit troisième segment 31 étant ici parallèles. De cette manière, chaque branche peut avoir un profil en forme de C ou en forme de U . Chacune des deux branches 27, 28 est composée d'une tubulure cylindrique reliant la cavité 24 au conduit amont 26, les deux branches 27, 28 ayant le même diamètre. Préférentiellement, la longueur du troisième segment 31 est supérieure ou égale à trois fois son diamètre pour permettre au gaz circulant dans la branche 27, 28 de déboucher dans le conduit amont 26 sans être perturbé. Referring to FIGS. 2A and 2B, the branch 18 comprising the discharge valve 19 has an upstream section 22 connecting a conduit 23 of the intake circuit situated downstream of the compressor 5 to a cavity 24 enclosing the discharge valve 19, and a downstream section 25 connecting said cavity 24 to a duct 26 of the intake circuit located upstream of said compressor 5. This downstream section 24 here divides into two branches 27, 28 each connecting the cavity 24 to said upstream duct 26. The cavity 24 containing the discharge valve 19 and the upstream conduit 26 are cylindrical, and the two branches 27, 28 are implanted in said cavity 24 diametrically opposite and are located in said upstream conduit 26 diametrically opposite. Each branch 27, 28 thus comprises a first rectilinear segment 29 implanted in the cavity 24, extended by a second curved segment 30 itself extended by a third rectilinear segment 31 opening into the upstream conduit 26, said first segment 29 and said third segment 31 being here parallel. In this way, each branch can have a profile in C-shaped or U-shaped. Each of the two branches 27, 28 is composed of a cylindrical pipe connecting the cavity 24 to the upstream pipe 26, the two branches 27, 28 having the same diameter. Preferably, the length of the third segment 31 is greater than or equal to three times its diameter to allow the gas flowing in the branch 27, 28 to open into the upstream duct 26 without being disturbed.
Les gaz comprimés dans le conduit 23 situé en aval du compresseur 5, peuvent être évacués vers le conduit amont 26, via la dérivation 18 au moyen d'une ouverture de la vanne de décharge 19. Les gaz passent ainsi d'abord par le tronçon amont 22 de la dérivation 18, puis par la cavité 24 logeant la vanne de décharge 19. The compressed gases in the pipe 23 located downstream of the compressor 5, can be discharged to the upstream pipe 26, via the bypass 18 by means of an opening of the discharge valve 19. The gases thus pass first through the section upstream 22 of the branch 18, then through the cavity 24 housing the discharge valve 19.
En se référant à la figure 3, lesdits gaz progressent ensuite dans les deux branches 27, 28 pour déboucher dans le conduit amont 26 du circuit d'admission. En raison de la disposition particulière de l'arrivée de ces deux branches 27, 28 dans le canal amont 26, à savoir en étant diamétralement opposées, une fraction des gaz provenant de l'une des deux branches 27, 28 et débouchant dans le canal amont 26, va s'engouffrer dans la branche 27, 28 située en face, réduisant ainsi la fraction des gaz amenée à remonter dans ledit canal amont 26 vers l'entrée d'air 3. Ce phénomène est réciproque avec l'autre branche 27, 28 et bénéficie donc aux deux branches 27, 28. Par conséquent, la quantité des gaz en provenance des branches 27, 28 de la dérivation 18 et destinée à remonter dans le circuit d'admission jusqu'à l'entrée d'admission 3, est fortement réduite, atténuant ainsi fortement, voire annulant, le bruit lié à la remontée des gaz dans ledit circuit. En se référant à la figure 4A, selon un premier mode de réalisation préféré d'un circuit d'admission d'air selon l'invention, la vanne 19 de décharge est déportée de sorte que la dérivation 18 soit externe au compresseur 5. Pour cette configuration le compresseur 5 et la dérivation 18 sont deux éléments indépendants qu'il faut monter séparément, en respectant une certaine rigueur et une certaine précision. En se référant à la figure 4B, selon un deuxième mode de réalisation préféré d'un circuit d'admission d'air selon l'invention, la vanne 19 de décharge est intégrée à un carter 32 du compresseur 5. Pour cette configuration, le compresseur 5 et la vanne 19 de décharge sont regroupés pour constituer un ensemble compact facile à monter. Referring to Figure 3, said gases then progress in the two branches 27, 28 to open into the upstream duct 26 of the intake circuit. Due to the particular arrangement of the arrival of these two branches 27, 28 in the upstream channel 26, namely being diametrically opposed, a fraction of the gases from one of the two branches 27, 28 and opening into the channel upstream 26, will rush into the branch 27, 28 located in front, thereby reducing the fraction of gas brought up in said upstream channel 26 to the air inlet 3. This phenomenon is reciprocal with the other branch 27 , 28 and therefore benefits the two branches 27, 28. Therefore, the amount of gas from the branches 27, 28 of the bypass 18 and intended to go back into the intake circuit to the intake inlet 3 , is greatly reduced, thereby greatly reducing, or even canceling, the noise associated with the rise of the gases in said circuit. Referring to FIG. 4A, according to a first preferred embodiment of an air intake circuit according to the invention, the discharge valve 19 is offset so that the bypass 18 is external to the compressor 5. For this configuration the compressor 5 and the bypass 18 are two independent elements that must be mounted separately, respecting a certain rigor and a certain precision. Referring to Figure 4B, according to a second preferred embodiment of an air intake circuit according to the invention, the discharge valve 19 is integrated in a housing 32 of the compressor 5. For this configuration, the compressor 5 and the discharge valve 19 are combined to form a compact assembly easy to assemble.

Claims

REVENDICATIONS
Circuit d'admission d'air d'un moteur de véhicule suralimenté comprenant un compresseur (5) placé dans ledit circuit et un circuit de dérivation (18) comprenant une vanne (19) de décharge et permettant d'acheminer des gaz comprimés en aval du compresseur (5) vers une zone (26) du circuit d'admission située en amont dudit compresseur (5), caractérisée en ce qu'un tronçon (25) du circuit de dérivation (18) compris entre la vanne (19) de décharge et ladite zone (26) comprend au moins deux branches (27, 28) aptes à acheminer les gaz vers la zone (26), et en ce que lesdites branches (27, 28) sont implantés dans un conduit (26) délimitant ladite zone.  An air intake circuit of a supercharged engine engine comprising a compressor (5) in said circuit and a bypass circuit (18) including a discharge valve (19) for conveying compressed gases downstream compressor (5) to a zone (26) of the intake circuit located upstream of said compressor (5), characterized in that a section (25) of the branch circuit (18) between the valve (19) of discharge and said zone (26) comprises at least two branches (27, 28) capable of conveying the gases towards the zone (26), and in that said branches (27, 28) are located in a conduit (26) delimiting said zoned.
Circuit d'admission selon la revendication 1, caractérisée en ce que le tronçon (25) du circuit de dérivation (18) comprend un nombre pair de branches (27, 28), et en ce que les branches (27, 28) sont implantées dans le conduit (26) de manière à constituer des paires de branches (27, 28) se faisant face autour dudit conduit (26). Intake circuit according to Claim 1, characterized in that the section (25) of the branch circuit (18) comprises an even number of branches (27, 28), and that the branches (27, 28) are implanted in the conduit (26) so as to form pairs of legs (27, 28) facing each other around said conduit (26).
Circuit d'admission selon l'une quelconque des revendications 1 ou 2, caractérisée en ce que la section de passage des gaz dans chacune des branches (27, 28) est inférieure à la section de passage des gaz dans le conduit (26). Intake circuit according to any one of claims 1 or 2, characterized in that the gas passage section in each of the branches (27, 28) is smaller than the gas passage section in the conduit (26).
Circuit d'admission selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les sections de passage des gaz dans les branches (27, 28) sont identiques. Intake circuit according to one of Claims 1 to 3, characterized in that the gas passage sections in the branches (27, 28) are identical.
Circuit d'admission selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le conduit (26) est cylindrique, et en ce que le tronçon (25) du circuit de dérivation (18) comprend deux branches (27, 28) implantées dans ledit conduit (26) de façon diamétralement opposée. Intake circuit according to one of Claims 1 to 4, characterized in that the duct (26) is cylindrical, and that the section (25) of the shunt circuit (18) comprises two branches (27, 28 ) implanted in said conduit (26) diametrically opposite.
6. Circuit d'admission selon la revendication 5, caractérisée en ce que la section de passage des gaz dans chacune des branches (27, 28) est sensiblement égale à la moitié de la section de passage des gaz dans le du tronçon (25) s'il était constitué d'une seule branche. 6. Intake circuit according to claim 5, characterized in that the gas passage section in each of the branches (27, 28) is substantially equal to half of the gas passage section in the section (25). if it consisted of a single branch.
7. Circuit d'admission selon l'une quelconque des revendications 5 ou 6, caractérisée en ce que chaque branche (27, 28) se termine par un segment (31) rectiligne implanté dans le conduit (26). 7. Intake circuit according to any one of claims 5 or 6, characterized in that each branch (27, 28) terminates in a segment (31) rectilinear implanted in the conduit (26).
8. Circuit d'admission selon la revendication 7, caractérisé en ce que la longueur du segment rectiligne (31) est comprise entre 2 fois et 5 fois son diamètre interne. 8. Intake circuit according to claim 7, characterized in that the length of the rectilinear segment (31) is between 2 times and 5 times its internal diameter.
9. Circuit d'admission selon l'une quelconque des revendications 1 à 8, caractérisée en ce que la vanne de décharge (19) est déportée et en ce que le circuit de dérivation (18) est distinct du compresseur (5). 9. Intake circuit according to any one of claims 1 to 8, characterized in that the discharge valve (19) is offset and in that the branch circuit (18) is separate from the compressor (5).
10. Circuit d'admission selon l'une quelconque des revendications 1 à 8, caractérisée en ce que la vanne de décharge (19) est intégrée dans un carter (32) du compresseur (5). Intake circuit according to one of Claims 1 to 8, characterized in that the discharge valve (19) is integrated in a housing (32) of the compressor (5).
EP17800906.4A 2016-10-28 2017-10-27 Air intake circuit for a supercharged engine Withdrawn EP3532717A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1660498A FR3058185B1 (en) 2016-10-28 2016-10-28 AIR INTAKE CIRCUIT OF A SUPERCHARGED ENGINE
PCT/FR2017/052968 WO2018078296A2 (en) 2016-10-28 2017-10-27 Air intake circuit for a supercharged engine

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WO2022214852A1 (en) * 2021-04-09 2022-10-13 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Supplying a mixture of air and exhaust gas to a compressor wheel of a compressor

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DE102010028975A1 (en) * 2010-05-14 2012-03-29 Abb Turbo Systems Ag Additional compressor housing
FR2986274A3 (en) * 2012-01-30 2013-08-02 Renault Sa Method for controlling supercharging process performed by architecture of e.g. diesel engine of car, involves opening discharge valve by controller based on predetermined engine speed when difference value reaches threshold value
IN2014MN02647A (en) * 2012-06-20 2015-08-21 Dayco Ip Holdings Llc
US9133852B2 (en) * 2013-06-13 2015-09-15 Dayco Ip Holdings, Llc Pneumatic compressor recirculation valve system for minimizing surge under boost during throttle closing

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FR3058185B1 (en) 2018-11-02
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WO2018078296A2 (en) 2018-05-03

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