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WO2008009789A1 - Combustion engine supply circuit with swirling of the gases and corresponding combustion engine - Google Patents

Combustion engine supply circuit with swirling of the gases and corresponding combustion engine Download PDF

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Publication number
WO2008009789A1
WO2008009789A1 PCT/FR2007/001119 FR2007001119W WO2008009789A1 WO 2008009789 A1 WO2008009789 A1 WO 2008009789A1 FR 2007001119 W FR2007001119 W FR 2007001119W WO 2008009789 A1 WO2008009789 A1 WO 2008009789A1
Authority
WO
WIPO (PCT)
Prior art keywords
compressor
circuit
exhaust
gases
supply circuit
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.)
Ceased
Application number
PCT/FR2007/001119
Other languages
French (fr)
Inventor
Sébastien Potteau
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.)
Valeo Electrification SAS
Original Assignee
Valeo Systemes de Controle Moteur 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 Valeo Systemes de Controle Moteur SAS filed Critical Valeo Systemes de Controle Moteur SAS
Publication of WO2008009789A1 publication Critical patent/WO2008009789A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
    • 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
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • 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
    • 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
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10157—Supercharged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/40—Application in turbochargers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/14—Preswirling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a supply circuit for a heat engine and a corresponding heat engine that can be used in particular for moving an automobile vehicle.
  • An internal combustion engine generally comprises an engine block delimiting combustion chambers or cylinders closed on one side by a cylinder head and on the other side by pistons slidably received in the cylinders and connected by connecting rods to a crankshaft. - even connected to the vehicle's gearbox.
  • the engine also comprises a supply circuit connected to the engine block so as to bring air into the cylinders and an exhaust circuit connected to the engine block to evacuate the burned gases of the cylinders.
  • the supply circuit generally comprises a gas inlet duct opening into a centrifugal compressor coaxially with an axis of rotation of the compressor and the exhaust circuit comprises a compressor driving turbine rotated by the flue gases.
  • the efficiency of the compressor is of the order of 0.7
  • the efficiency of the mechanical connection between the compressor and the turbine is of the order of 0.98
  • the efficiency of the turbine of the order of 0.5. so that the turbocharger assembly has a relatively low overall efficiency of the order of 0.34. This low efficiency penalizes engine performance in terms of energy consumption.
  • An object of the invention is to provide a means for improving the efficiency of such a thermal engine.
  • a supply circuit for a heat engine comprising a gas inlet duct opening into a centrifugal compressor coaxially with an axis of rotation of the compressor, the duct inlet being provided upstream of the centrifugal compressor a means for rotating the gas about the axis of rotation of the compressor and in a direction of rotation thereof.
  • a centrifugal compressor comprises a finned rotary disc for feeding an injected airflow to the center of the disc towards the periphery thereof so as to use the centrifugal force to accelerate the flow and obtain a higher outlet pressure. at the inlet pressure.
  • the means for rotating the gases ensures, upstream of the compressor, a rotation of the gases around the axis of rotation of the compressor and in the direction of rotation thereof so as to limit the energy expenditure required at the level of the compressor. compressor to rotate the gases. This results in an increase in the efficiency of the compressor.
  • the rotating means comprises a secondary duct opening tangentially into the intake duct for injecting a gas under pressure.
  • This mode of rotation is particularly effective and also makes it possible to increase the pressure of the gases entering the compressor, making it easier and less costly to obtain the desired pressure at the outlet of the compressor.
  • the secondary duct is connected to an exhaust gas recirculation circuit of the engine.
  • This embodiment makes it possible to take advantage of the beneficial effects of the recirculation of gases from a point of view of the operation of the engine and the rotation of the gas upstream of the compressor.
  • the invention also relates to a heat engine comprising such a power supply circuit.
  • the engine comprises a motor unit connected to the supply circuit and an exhaust circuit comprising a compressor drive turbine, an exhaust gas recirculation circuit being connected to the exhaust circuit upstream of the engine. turbine and the intake circuit upstream of the compressor.
  • the exhaust gases taken upstream of the turbine have a relatively high pressure which makes it possible, once the exhaust gases collected reinjected into the intake pipe, to increase the pressure in the intake pipe so as to reduce the pressure differential at the inlet and at the outlet of the compressor. This significantly improves the efficiency of the compressor.
  • FIG. 1 is a schematic view of a compliant thermal motor "in the invention
  • FIG. 2 is a partial diagrammatic view, in longitudinal section, of a supply circuit according to the invention.
  • FIG. 3 is a view of the sectional feeding circuit along the line III of FIG. 2.
  • the heat engine according to the invention comprises a motor unit 2 defining in known manner combustion chambers provided with pistons rotating a motor output shaft.
  • the engine block 2 is connected in a manner known per se to a supply circuit generally designated 3 and an exhaust circuit generally designated 4.
  • the supply circuit 3 comprises an intake pipe 5 opening into a compressor 6 connected by an intake manifold 7 to the combustion chambers of the engine block 2.
  • the compressor 6 is a centrifugal compressor known in itself comprising a disc with fins 8 mounted for pivoting about an axis 9 in a housing 10.
  • the intake pipe 5 opens into the housing 10 coaxially with the axis of rotation 9.
  • the exhaust system 4 is known per se and comprises an exhaust pipe 12 connecting the combustion chambers of the engine block 2 to a turbine 13 for rotating the compressor 6.
  • the turbine 13 is connected to a pipe exhaust outlet 14 incorporating for example a catalyzed pot.
  • the heat engine further comprises a recirculation circuit 11 of the exhaust gas.
  • the recirculation circuit 11 of the exhaust gas has a duct 15 having an end 16 connected to the exhaust pipe 12 upstream of the turbine 13 and an end portion 17 connected to the intake pipe 5 upstream of the exhaust pipe 12. 6. Between these two ends, the duct 16 incorporates a heat exchanger 18.
  • the recirculation duct forms, at its end 17, a secondary duct which opens out tangentially to the intake duct 5 and which is slightly inclined relative to the intake duct 5 to form with it an acute angle whose apex is directed towards the compressor 6.
  • the gas flow leaving the secondary duct 17 enters thus in the intake pipe 5 tangentially forming with the direction of the gas flow of the intake pipe 5 an acute apex angle turned towards the compressor 6 so as to communicate to the gas flow a helical path rotating in the direction of rotation 19 of the compressor 6.
  • the secondary duct by its tangential orientation, is a means for rotating the gases in the intake duct so as to limit the energy that the compressor must supply to the gas to rotate them.
  • the gases from the secondary duct 17 having been taken upstream of the turbine 13 are at a pressure greater than the atmospheric pressure so that they contribute to increasing the inlet pressure of the compressor 6.
  • the compressor used may have a lower compression ratio.
  • the means for rotating the gases may have a different structure from that described and comprise for example fins extending protruding into the intake duct helically around the axis of the intake duct.
  • the pressurized gas injected by the tangential secondary duct may not come from an exhaust gas recirculation circuit.
  • the secondary circuit may be tangential and perpendicular to the axis of the intake pipe.
  • the invention is applicable to engines without a gas recirculation circuit.
  • the recirculation circuit may have a structure different from that described and, for example, incorporate a particulate filter, have a high pressure or low pressure structure.
  • the turbine and the compressor may have structures different from those described.
  • the feed circuit will advantageously comprise a charge air cooler.
  • the engine may also have a different structure and, for example, be rotary pistons.

Landscapes

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

Abstract

The present invention relates to a supply circuit (3) of a combustion engine (1), comprising a gas intake pipe (5) opening into a centrifugal compressor (6) coaxially with respect to an axis of rotation (9) of the compressor, the intake pipe (5) being provided upstream of the centrifugal compressor with a means (17) for causing the gases to swirl about the axis of rotation of the compressor and in a direction in which the latter rotates. A further subject of the invention is a corresponding engine.

Description

Circuit d'alimentation (J71Un moteur thermique avec mise en rotation des gaz et moteur thermique correspondantSupply circuit (J 71 A heat engine with gas rotation and corresponding heat engine

La présente invention concerne un circuit d'ali- mentation d'un moteur thermique et un moteur thermique correspondant utilisable notamment pour mouvoir un véhicule automobi1e .The present invention relates to a supply circuit for a heat engine and a corresponding heat engine that can be used in particular for moving an automobile vehicle.

ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

Un moteur thermique à combustion interne comprend généralement un bloc moteur délimitant des chambres de combustion ou cylindres fermés d'un côté par une culasse et de l'autre côté par des pistons reçus à coulissement dans les cylindres et reliés par des bielles à un vilebrequin lui-même relié à la boîte de vitesses du véhi- cule. Le moteur comprend également un circuit d'alimentation relié au bloc moteur de manière à amener de l'air dans les cylindres et un circuit d'échappement relié au bloc moteur pour évacuer les gaz brûles des cylindres. Le circuit d'alimentation comporte généralement une conduite d'admission de gaz débouchant dans un compresseur centrifuge coaxialement à un axe de rotation du compresseur et le circuit d'échappement comprend une turbine d'entraînement du compresseur mise en rotation par les gaz brûlés.An internal combustion engine generally comprises an engine block delimiting combustion chambers or cylinders closed on one side by a cylinder head and on the other side by pistons slidably received in the cylinders and connected by connecting rods to a crankshaft. - even connected to the vehicle's gearbox. The engine also comprises a supply circuit connected to the engine block so as to bring air into the cylinders and an exhaust circuit connected to the engine block to evacuate the burned gases of the cylinders. The supply circuit generally comprises a gas inlet duct opening into a centrifugal compressor coaxially with an axis of rotation of the compressor and the exhaust circuit comprises a compressor driving turbine rotated by the flue gases.

Le rendement du compresseur est de 1 ' ordre de 0,7, le rendement de la liaison mécanique entre le compresseur et la turbine est de l'ordre de 0,98 et le rendement de la turbine de l'ordre de 0,5 de sorte que l'ensemble turbocompresseur a un rendement global relativement faible de l'ordre de 0,34. Ce faible rendement péna- lise les performances des moteurs en terme de consommation énergétique.The efficiency of the compressor is of the order of 0.7, the efficiency of the mechanical connection between the compressor and the turbine is of the order of 0.98 and the efficiency of the turbine of the order of 0.5. so that the turbocharger assembly has a relatively low overall efficiency of the order of 0.34. This low efficiency penalizes engine performance in terms of energy consumption.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

Un but de l'invention est de proposer un moyen permettant d'améliorer le rendement d'un tel moteur ther- mique . RESUME DE L'INVENTIONAn object of the invention is to provide a means for improving the efficiency of such a thermal engine. SUMMARY OF THE INVENTION

A cet effet, on prévoit, selon l'invention, un circuit d'alimentation d'un moteur thermique, comportant une conduite d'admission de gaz débouchant dans un com- presseur centrifuge coaxialement à un axe de rotation du compresseur, la conduite d'admission étant pourvue en amont du compresseur centrifuge d'un moyen de mise en rotation des gaz autour de l'axe de rotation du compresseur et dans un sens de rotation de celui-ci. On rappelle qu'un compresseur centrifuge comprend un disque rotatif à ailettes pour amener un flux d'air injecté au centre du disque vers la périphérie de celui- ci de manière à utiliser la force centrifuge pour accélérer le flux et obtenir une pression de sortie supérieure à la pression d'entrée. Le moyen de mise en rotation des gaz assure, en amont du compresseur, une mise en rotation des gaz autour de l'axe de rotation du compresseur et dans le sens de rotation de celui-ci de manière à limiter la dépense énergétique nécessaire au niveau du compres- seur pour mettre en rotation les gaz. Il en résulte une augmentation du rendement du compresseur.For this purpose, provision is made, according to the invention, for a supply circuit for a heat engine, comprising a gas inlet duct opening into a centrifugal compressor coaxially with an axis of rotation of the compressor, the duct inlet being provided upstream of the centrifugal compressor a means for rotating the gas about the axis of rotation of the compressor and in a direction of rotation thereof. It will be recalled that a centrifugal compressor comprises a finned rotary disc for feeding an injected airflow to the center of the disc towards the periphery thereof so as to use the centrifugal force to accelerate the flow and obtain a higher outlet pressure. at the inlet pressure. The means for rotating the gases ensures, upstream of the compressor, a rotation of the gases around the axis of rotation of the compressor and in the direction of rotation thereof so as to limit the energy expenditure required at the level of the compressor. compressor to rotate the gases. This results in an increase in the efficiency of the compressor.

De préférence, le moyen de mise en rotation comprend un conduit secondaire débouchant tangentiellement dans la conduite d'admission pour y injecter un gaz sous pression.Preferably, the rotating means comprises a secondary duct opening tangentially into the intake duct for injecting a gas under pressure.

Ce mode de mise en rotation est particulièrement efficace et permet en outre d'augmenter la pression des gaz en entrée du compresseur, rendant plus facile et moins coûteuse en énergie l'obtention de la pression sou- haitée en sortie du compresseur.This mode of rotation is particularly effective and also makes it possible to increase the pressure of the gases entering the compressor, making it easier and less costly to obtain the desired pressure at the outlet of the compressor.

Avantageusement alors, le conduit secondaire est relié à un circuit de recirculation de gaz d'échappement du moteur thermique .Advantageously then, the secondary duct is connected to an exhaust gas recirculation circuit of the engine.

Ce mode de réalisation permet de profiter des ef- fets bénéfiques de la recirculation des gaz d'un point de vue du fonctionnement du moteur et de la mise en rotation des gaz en amont du compresseur.This embodiment makes it possible to take advantage of the beneficial effects of the recirculation of gases from a point of view of the operation of the engine and the rotation of the gas upstream of the compressor.

L'invention a également pour objet un moteur thermique comportant un tel circuit d'alimentation. Avantageusement, le moteur comprend un bloc moteur relié au circuit d'alimentation et à un circuit d ' échappement comportant une turbine d ' entraînement du compresseur, un circuit de recirculation des gaz d'échappement étant raccordé au circuit d'échappement en amont de la turbine et au circuit d'admission en amont du compresseur.The invention also relates to a heat engine comprising such a power supply circuit. Advantageously, the engine comprises a motor unit connected to the supply circuit and an exhaust circuit comprising a compressor drive turbine, an exhaust gas recirculation circuit being connected to the exhaust circuit upstream of the engine. turbine and the intake circuit upstream of the compressor.

Les gaz d'échappement prélevés en amont de la turbine ont une pression relativement élevée qui permet, une fois les gaz d'échappement prélevés réinjectés dans la conduite d'admission, d'élever la pression dans la conduite d'admission de manière à réduire le différentiel de pression en entrée et en sortie du compresseur. On améliore ainsi de façon significative le rendement du compresseur. BREVE DESCRIPTION DES DESSINSThe exhaust gases taken upstream of the turbine have a relatively high pressure which makes it possible, once the exhaust gases collected reinjected into the intake pipe, to increase the pressure in the intake pipe so as to reduce the pressure differential at the inlet and at the outlet of the compressor. This significantly improves the efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit d'un mode de réalisation particulier non limitatif de l'invention. II sera fait référence aux dessins annexés, parmi lesquels :Other features and advantages of the invention will become apparent on reading the following description of a particular non-limiting embodiment of the invention. Reference will be made to the appended drawings, among which:

- la figure 1 est une vue schématique d'un moteur thermique conforme "à l'invention,- Figure 1 is a schematic view of a compliant thermal motor "in the invention,

- la figure 2 est une vue schématique partielle, en coupe longitudinale, d'un circuit d'alimentation conforme à l'invention,FIG. 2 is a partial diagrammatic view, in longitudinal section, of a supply circuit according to the invention,

- la figure 3 est une vue du circuit d'alimentation en coupe selon la ligne III de la figure 2.FIG. 3 is a view of the sectional feeding circuit along the line III of FIG. 2.

DESCRIPTION DETAILLEE DE L'INVENTION En référence aux figures, le moteur thermique conforme à l'invention, généralement désigné en 1, comprend un bloc moteur 2 définissant de façon connue en soi des chambres de combustion pourvues de pistons entraînant en rotation un arbre de sortie du moteur. Le bloc moteur 2 est relié de façon connue en elle-même à un circuit d'alimentation généralement désigné en 3 et à un circuit d'échappement généralement désigné en 4.DETAILED DESCRIPTION OF THE INVENTION With reference to the figures, the heat engine according to the invention, generally designated 1, comprises a motor unit 2 defining in known manner combustion chambers provided with pistons rotating a motor output shaft. The engine block 2 is connected in a manner known per se to a supply circuit generally designated 3 and an exhaust circuit generally designated 4.

Le circuit d'alimentation 3 comprend une conduite d'admission 5 débouchant dans un compresseur 6 relié par une tubulure d'admission 7 aux chambres de combustion du bloc moteur 2. Le compresseur 6 est un compresseur centrifuge connu en lui-même comportant un disque à ailettes 8 monté pour pivoter autour d'un axe 9 dans un carter 10. La conduite d'admission 5 débouche dans le carter 10 coaxialement à l'axe de rotation 9.The supply circuit 3 comprises an intake pipe 5 opening into a compressor 6 connected by an intake manifold 7 to the combustion chambers of the engine block 2. The compressor 6 is a centrifugal compressor known in itself comprising a disc with fins 8 mounted for pivoting about an axis 9 in a housing 10. The intake pipe 5 opens into the housing 10 coaxially with the axis of rotation 9.

Le circuit d'échappement 4 est connu en lui-même et comprend une tubulure d'échappement 12 reliant les chambres de combustion du bloc moteur 2 à une turbine 13 d'entraînement en rotation du compresseur 6. La turbine 13 est reliée à une conduite de sortie d'échappement 14 incorporant par exemple un pot catalysé .The exhaust system 4 is known per se and comprises an exhaust pipe 12 connecting the combustion chambers of the engine block 2 to a turbine 13 for rotating the compressor 6. The turbine 13 is connected to a pipe exhaust outlet 14 incorporating for example a catalyzed pot.

Le moteur thermique comprend en outre un circuit de recirculation 11 des gaz d'échappement. Le circuit de recirculation 11 des gaz d'échappement possède un conduit 15 ayant une extrémité 16 reliée à la tubulure d'échappement 12 en amont de la turbine 13 et une portion d'extrémité 17 reliée à la conduite d'admission 5 en amont du compresseur 6. Entre ces deux extrémités, le conduit 16 incorpore un échangeur thermique 18. Le conduit de recir- culation forme, au niveau de son extrémité 17, un conduit secondaire qui débouche tangentiellement à la conduite d'admission 5 et qui est légèrement incliné par rapport à la conduite d'admission 5 pour former avec celle-ci un angle aigu dont le sommet est dirigé vers le compresseur 6. Le flux gazeux sortant du conduit secondaire 17 rentre ainsi dans la conduite d'admission 5 tangentiellement en formant avec la direction du flux gazeux de la conduite d'admission 5 un angle aigu à sommet tourné vers le compresseur 6 de manière à communiquer au flux gazeux une trajectoire en hélice tournant dans le sens de rotation 19 du compresseur 6.The heat engine further comprises a recirculation circuit 11 of the exhaust gas. The recirculation circuit 11 of the exhaust gas has a duct 15 having an end 16 connected to the exhaust pipe 12 upstream of the turbine 13 and an end portion 17 connected to the intake pipe 5 upstream of the exhaust pipe 12. 6. Between these two ends, the duct 16 incorporates a heat exchanger 18. The recirculation duct forms, at its end 17, a secondary duct which opens out tangentially to the intake duct 5 and which is slightly inclined relative to the intake duct 5 to form with it an acute angle whose apex is directed towards the compressor 6. The gas flow leaving the secondary duct 17 enters thus in the intake pipe 5 tangentially forming with the direction of the gas flow of the intake pipe 5 an acute apex angle turned towards the compressor 6 so as to communicate to the gas flow a helical path rotating in the direction of rotation 19 of the compressor 6.

Le conduit secondaire, de par son orientation tangentielle, constitue un moyen de mise en rotation des gaz dans la conduite d'admission de manière à limiter l'énergie que le compresseur doit fournir au gaz pour les mettre en rotation.The secondary duct, by its tangential orientation, is a means for rotating the gases in the intake duct so as to limit the energy that the compressor must supply to the gas to rotate them.

En outre, les gaz issus du conduit secondaire 17 ayant été prélevés en amont de la turbine 13 sont à une pression supérieure à la pression atmosphérique de sorte qu'ils contribuent à augmenter la pression en entrée du compresseur 6. Par rapport à l'art antérieur connu, le compresseur utilisé peut avoir un taux de compression plus faible .In addition, the gases from the secondary duct 17 having been taken upstream of the turbine 13 are at a pressure greater than the atmospheric pressure so that they contribute to increasing the inlet pressure of the compressor 6. Compared to the art known prior, the compressor used may have a lower compression ratio.

On notera en outre que comme la pression des gaz prélevés en amont de la turbine est supérieure à celle des gaz circulant dans la conduite d'admission 5, il n'est pas nécessaire de prévoir une vanne de contre pression dans la conduite d'échappement comme c'est le cas dans les systèmes de recirculation prélevant les gaz d'échappement en aval de la turbine.It will further be noted that since the pressure of the gases taken upstream of the turbine is greater than that of the gases flowing in the intake pipe 5, it is not necessary to provide a backpressure valve in the exhaust pipe. as is the case in the recirculation systems taking the exhaust gases downstream of the turbine.

Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit et on peut y apporter des variantes de réalisation sans sortir du cadre de l ' invention tel que défini par les revendications. En particulier, le moyen de mise en rotation des gaz peut avoir une structure différente de celle décrite et comprendre par exemple des ailettes s ' étendant en saillie dans la conduite d'admission hélicoïdalement autour de l'axe de la conduite d'admission. Le gaz sous pression injecté par le conduit secondaire tangentiel peut ne pas provenir d'un circuit de recirculation des gaz d'échappement. Le circuit secondaire peut être tangentiel et perpendiculaire à l'axe de la conduite d'admission. L'invention est applicable à des moteurs dépourvus de circuit de recirculation de gaz. Le circuit de recirculation peut avoir une structure différente de celle décrite et, par exemple, incorporer un filtre à particules, présenter une structure haute pression ou basse pression.Of course, the invention is not limited to the embodiment described and variations can be made without departing from the scope of the invention as defined by the claims. In particular, the means for rotating the gases may have a different structure from that described and comprise for example fins extending protruding into the intake duct helically around the axis of the intake duct. The pressurized gas injected by the tangential secondary duct may not come from an exhaust gas recirculation circuit. The secondary circuit may be tangential and perpendicular to the axis of the intake pipe. The invention is applicable to engines without a gas recirculation circuit. The recirculation circuit may have a structure different from that described and, for example, incorporate a particulate filter, have a high pressure or low pressure structure.

La turbine et le compresseur peuvent avoir des structures différentes de celles décrites. Le circuit d'alimentation comprendra avantageusement un refroidis- seur d'air de suralimentation. Le moteur peut également avoir une structure différente et, par exemple, être à pistons rotatifs. The turbine and the compressor may have structures different from those described. The feed circuit will advantageously comprise a charge air cooler. The engine may also have a different structure and, for example, be rotary pistons.

Claims

REVENDICATIONS 1. Circuit d'alimentation (3) d'un moteur thermique (1), comportant une conduite d'admission (5) de gaz débouchant dans un compresseur centrifuge (6) coaxiale- ment à un axe de rotation (9) du compresseur, caractérisé en ce que la conduite d'admission (5) est pourvue en amont du compresseur centrifuge d'un moyen (17) de mise en rotation des gaz autour de l'axe de rotation du com- presseur et dans un sens de rotation (19) de celui-ci.1. Supply circuit (3) of a heat engine (1), comprising a gas inlet pipe (5) opening into a centrifugal compressor (6) coaxially with an axis of rotation (9) of the compressor characterized in that the inlet pipe (5) is provided upstream of the centrifugal compressor with means (17) for rotating the gases around the axis of rotation of the compressor and in a direction of rotation. (19) thereof. 2. Circuit selon la revendication 1, dans lequel le moyen de mise en rotation comprend un conduit secondaire (17) débouchant tangentiellement dans la conduite d'admission (5) pour y injecter un gaz sous pression.2. Circuit according to claim 1, wherein the rotating means comprises a secondary duct (17) opening tangentially in the intake duct (5) for injecting a gas under pressure. 3. Circuit selon la revendication 2, dans lequel le conduit secondaire (17) est relié à un circuit de recirculation de gaz d'échappement (11) du moteur thermique (D . 3. Circuit according to claim 2, wherein the secondary duct (17) is connected to an exhaust gas recirculation circuit (11) of the engine (D. 4. Moteur thermique (1) comportant un circuit d'alimentation (3) conforme à l'une quelconque des revendications précédentes.4. Heat engine (1) having a supply circuit (3) according to any one of the preceding claims. 5. Moteur selon la revendication 1, comprenant un bloc moteur (2) relié au circuit d'alimentation (3) et à un circuit d'échappement (4) comportant une turbine (13) d'entraînement du compresseur (6), un circuit de recirculation du gaz d'échappement (11) reliant le circuit d'échappement au circuit d'admission, dans lequel le circuit de recirculation est raccordé au circuit d'échappe- ment en amont de la turbine et est raccordé au circuit d'admission en amont du compresseur. 5. Motor according to claim 1, comprising a motor unit (2) connected to the supply circuit (3) and to an exhaust circuit (4) comprising a turbine (13) for driving the compressor (6), a an exhaust gas recirculation circuit (11) connecting the exhaust circuit to the intake circuit, wherein the recirculation circuit is connected to the exhaust circuit upstream of the turbine and is connected to the exhaust circuit; intake upstream of the compressor.
PCT/FR2007/001119 2006-07-21 2007-06-29 Combustion engine supply circuit with swirling of the gases and corresponding combustion engine Ceased WO2008009789A1 (en)

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FR0606655A FR2904057B1 (en) 2006-07-21 2006-07-21 HEATER SUPPLY CIRCUIT FOR A THERMAL MOTOR WITH ROTATION OF GASES AND THERMAL MOTOR CORRESPONDING THERMAL MOTOR
FR0606655 2006-07-21

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WO2015098391A1 (en) * 2013-12-26 2015-07-02 Toyota Jidosha Kabushiki Kaisha Exhaust gas recirculation apparatus for internal combustion engine with supercharger
US20190323460A1 (en) * 2018-04-23 2019-10-24 Ford Global Technologies, Llc Convolute-swirl integrated duct for swirl generation
US10709886B2 (en) 2017-02-28 2020-07-14 Boston Scientific Neuromodulation Corporation Electrical stimulation leads and systems with elongate anchoring elements and methods of making and using

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EP1264981A1 (en) * 2001-06-05 2002-12-11 Holset Engineering Company Limited Mixing fluid streams
EP1420159A2 (en) * 2002-11-15 2004-05-19 Isuzu Motors Limited EGR system for internal combustion engine provided with a turbo-charger
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WO2008129076A1 (en) * 2007-04-24 2008-10-30 Mann+Hummel Gmbh Combustion air and exhaust gas arrangement of an internal combustion engine
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FR2964151A1 (en) * 2010-08-31 2012-03-02 Coutier Moulage Gen Ind Low pressure system for recirculation of exhaust gas for internal combustion engine i.e. diesel engine, of motor vehicle i.e. car, has injection device that is connected to inlet conduit of turbo compressor in tangential manner
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WO2015098391A1 (en) * 2013-12-26 2015-07-02 Toyota Jidosha Kabushiki Kaisha Exhaust gas recirculation apparatus for internal combustion engine with supercharger
US10709886B2 (en) 2017-02-28 2020-07-14 Boston Scientific Neuromodulation Corporation Electrical stimulation leads and systems with elongate anchoring elements and methods of making and using
US20190323460A1 (en) * 2018-04-23 2019-10-24 Ford Global Technologies, Llc Convolute-swirl integrated duct for swirl generation
US10844817B2 (en) * 2018-04-23 2020-11-24 Ford Global Technologies, Llc Convolute-swirl integrated duct for swirl generation

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