EP1511931A1 - High-pressure fluid injection circuit - Google Patents

High-pressure fluid injection circuit

Info

Publication number
EP1511931A1
EP1511931A1 EP03735460A EP03735460A EP1511931A1 EP 1511931 A1 EP1511931 A1 EP 1511931A1 EP 03735460 A EP03735460 A EP 03735460A EP 03735460 A EP03735460 A EP 03735460A EP 1511931 A1 EP1511931 A1 EP 1511931A1
Authority
EP
European Patent Office
Prior art keywords
perimeter
circuit
cylinder
fluid
pump
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.)
Granted
Application number
EP03735460A
Other languages
German (de)
French (fr)
Other versions
EP1511931B1 (en
Inventor
Leonardo Cadeddu
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.)
VHIT SpA
Original Assignee
VHIT SpA
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 VHIT SpA filed Critical VHIT SpA
Publication of EP1511931A1 publication Critical patent/EP1511931A1/en
Application granted granted Critical
Publication of EP1511931B1 publication Critical patent/EP1511931B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0041—Means for damping pressure pulsations
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements

Definitions

  • the present invention relates to a high pressure fluid injection circuit
  • the invention aims to increase the performance of the high pressure fluid injection circuit
  • the invention is more particularly intended for the automotive field but can also applicable in other fields In the automobile field, this circuit makes it possible to inject a high pressure fluid inside at least one cylinder of an engine
  • the fluid is a fuel
  • a fluid injection circuit comprises a fluid reservoir, a hydraulic pump for injecting fluid at low pressure (approximately 10 bars or approximately 1,000,000 of Pascals) and at least one injector-pump
  • the reservoir, the pump injection and the injector-pump are connected by conduits allowing the fluid to circulate from the reservoir via the injection pump to the injector-pump to then circulate again and return, for its surplus, in the reservoir
  • La pump removed a fluid coming from the reservoir and increases the pressure of this fluid to a low pressure
  • this low pressure is under a pressure of 10 bars
  • This fluid under low pressure is then expelled from the injection pump through the conduits
  • a distributor distributes this fluid under low
  • This pressure wave can also cause pressure peaks to form. When these pressure peaks are too high, it can happen that these peaks damage elements contained in the injection circuit, reducing the performance of the high pressure injection circuit. For example, pressure peaks of 60 bars can be obtained for pressures delivered at 2,000 bars and damage the elements contained in the injection circuit.
  • the fluid injection circuits were not affected by this pressure wave because the pressurization of the fluid was carried out at low pressure and because the elements contained in these circuits were strong enough not to be damaged by these pressure waves.
  • This solution would have made the use of such a fluid injection circuit in a vehicle cumbersome. It would not have solved the pump problem anyway.
  • the invention therefore provides a pressure wave damper interposed in the conduits of the high pressure fluid injection circuit.
  • this damper is produced in such a way that it forces the fluid to follow paths of different length in several ways.
  • the direction of the fluid is such that the fluid must pass through narrow passage sections for the movement of the fluid to accelerate. By accelerating this movement of fluid creates turbulence. These turbulences break the regular movement of the fluid, thus attenuating the pressure wave and the resulting pressure peaks.
  • the shock absorber comprises a cylinder, inside of which a rod is arranged.
  • This rod is provided with plates, which plates define open compartments
  • the fluid circulates through these compartments by means of narrow passage sections L ' invention therefore relates to a high pressure fluid injection circuit comprising a low pressure fluid injection pump connected by conduits to a reservoir on the one hand, and to at least one injector-pump intended to deliver the high pressure fluid on the other hand, characterized in that it comprises a pressure wave damper interposed between an outlet of the pump in the direction of the pump injector and the pump injector
  • FIG. 1 a schematic representation of a high pressure fluid injection circuit according to the invention
  • FIG. 2 a graphical representation of at least one order for controlling a solenoid valve as a function of time, according to the invention
  • FIG. 5 a three-dimensional representation of a wave damper according to the invention
  • FIG. 6 a schematic representation of a pressure wave as a function of the distance traveled, according to the invention
  • FIG. 7 a graphical representation of a pressure wave as a function of time
  • FIG. 1 shows a high pressure fluid injection circuit 1 comprising a low pressure fluid injection pump 2 connected by conduits 3 1 and 3 to a reservoir 6 of fluid 5 and to at least one injector- pump 8 respectively, according to the invention
  • the pump 2 is incorporated in a body 4 A fluid supply in such a circuit is carried out in the following manner
  • the pump 2 sucks the fluid 5 contained in the reservoir 6 by the conduit 3 1
  • it may be of a fuel tank such as diesel
  • the fluid 5 is sent through conduits 3.
  • the low pressure pump 2 increases the pressure of the fluid by approximately 10 bars.
  • the conduits 3 HERE have a distributor 7 connected to at least one pump injector 8.
  • the distributor 7 is connected to four pump injectors 8
  • the pump injector 8 is connected to a cylinder 9 of an engine (not shown) inside which a piston slides 9 1
  • the injector-pump is intended to expel a volume of fluid at high pressure through an orifice (not shown) closed at rest by an injector needle (not shown)
  • the fluid pressure at the time of its expulsion from the pump injector is 2050 bars
  • the pump injector 8 is also provided with a solenoid valve 10, the opening 11 and closing 12 of which are controlled by an order Oi, Figure 2
  • the opening 11 and the closing 12 of the solenoid valve 10 of each of the pump injectors 8 are controlled by a control order O1 to O4, Figures 1 and 2
  • the solenoid valve thus allows to authorize an intermittent supply of fluid to each injector-pump.
  • the solenoid valve 10 may be in the opening 11 or closing 12 phase.
  • the opening may be predetermined for a transient period 13 so as to allow a pre-injection of fluid into the injector- pump
  • the fluid is then compressed inside the pump injector up to 300 bars.
  • the needle of the injector is dislodged from the orifice of the pump injector.
  • the fluid is then expelled into the cylinder of the engine at a pressure of approximately 2050 bars since the arrival of fuel in the injector-pump is greater than the quantity that can escape through the orifice of the injector-pump
  • a return of fluid towards the reservoir takes place in the following manner
  • the fluid circulates in the opposite direction to the direction followed by the fluid during the supply of the circuit when the solenoid valve opens again
  • the excess of fluid required for an effective pressure rise inside the injector-pump then returns to the tank by other conduits (not shown) different from the conduits 3
  • the high-pressure fluid injection circuit 1 comprises a pressure wave damper 14
  • the damper 14 is interposed between an outlet of the pump 2 in the direction of the injector-pump 8 and the pump injector 8, FIG. 1 More precisely and preferably, the damper 14 is located inside the body 4 of the pump 2, at the place where the outlet of the pump is located in the direction of the injector-pump 8 It could however be placed at another place along conduits 3, preferably upstream of the distributor 7
  • This shock absorber 14, in one example comprises a cylinder 15, FIG. 4 with an external portion 16 full and a central portion 17 hollow
  • a cross section of the shock absorber makes it possible to view a cross section 18 of the central part 17 of the cylinder 15, FIG. 4 On this cross section 18, it is possible to distinguish a perimeter 19, a surface 20, and a center 21
  • the cylinder 15 is circular, FIG. 4, but this cylinder 15 can also be rectangular
  • FIGS. 3, 5 This rod 22 comprises at least one plate 23
  • the cross section of the damper 14 also makes it possible to view a cross section 24 of the plate 23, FIG. 4
  • This cross section 24 makes it possible to distinguish a perimeter 25 and a surface 26
  • the rod 22 comprises several plates 23, FIGS. 3, 4 and 5. In FIG.
  • the rod 22 comprises six plates 23 and has a length of sixty millimeters, Figures 3 and 5
  • the plates 23 are arranged on the rod 22 one after the other in a same distance 27 inside of the central portion 17 of the cylinder 15, the plates 23 delimit compartments 28 in the preferred example, the trays 23 have the form of a disc cut along a chord and define five compartments 28, figures 3 4 and 5
  • the plates 23 are identical and the normal ones to their strings are oriented at an angle 29 different from one plate to another with respect to an axis 30 defined by the rod 22 and passing through the center 21
  • the plates 23 are oriented , alternately, with respect to each other at an angle of 180 ° with respect to the axis 30 of the rod 22, FIGS. 4 and 5
  • the plates 23 are arranged perpendicular to the axis 30, FIG. 3
  • the surface 26 of the plate 23 corresponds to at least half of the surface 20 oe the section 18 of the central part 17 of the cylinder 15.
  • the perimeter 25 of the plate 23 also partially matches the perimeter 19 of the central part 17 of the section 18 of the cylinder 15, FIG. 4.
  • the perimeter 25 of the plate 23 has a portion 31 and a portion
  • the portion 31 follows the perimeter 19 of the cylinder 15 while the portion 32 does not match it, FIG. 4.
  • the perimeter 19 of the cylinder 15 also has a portion 33 matching the plate 23 and a portion 34 not matching it.
  • the portion 32 of the plate 23 and the portion 34 of the cylinder 15 delimit a lateral orifice 35 with respect to the axis 30 defined by the rod 22, FIG. 4. Due to the presence of this lateral orifice 35 on each plate 23, the compartments 28 are open inside the cylinder 15, FIG. 3.
  • the plate 23 is made in such a way that, along an axis 38 perpendicular to the axis 30 defined by the rod 22, a point of the portion 31 of the perimeter 25 of the plate 23 is separated from another point of the portion 32 of the perimeter 25 of a distance 36.
  • a point of the portion 32 is separated from a point of the portion
  • the distance 36 is 4.5 millimeters and the distance
  • This pressure wave 40 moves in space and in time, FIGS. 6 and 7.
  • This pressure wave 40 emits at least one pressure peak 41 following the closing of the solenoid valve 10, FIG. 7.
  • FIG. 7 shows four pressure peaks 41 of a pressure wave 40 resulting from the successive opening 11 and closing 12 of the solenoid valve 10 of each of the four fluid injector pumps 8. These pressure peaks 41 can reach up to a pressure of 60 bars.
  • the lateral openings 35 and the arrangement of the plates 23 one above the other create narrowing and widening of sections inside the cylinder 15 of the shock absorber 14. These narrowing and these widening of sections force the fluid to rupture its straight path.
  • the reverse wave must pass through the same places.
  • the fluid 5 leaving the pump 2 penetrates inside the damper
  • the path 42 of the fluid inside the cylinder 15 has a sinusoidal shape, FIG. 3.
  • the pressure wave 40 penetrates inside the cylinder 15 and describes a same trajectory 43 visible in dotted lines in FIG. 3.
  • the fluid 5 under pressure creates turbulence inside the compartments 28 after it passes through the lateral orifices 35 substantially reducing the pressure peaks of the pressure wave up to 50% of their maximum value.

Landscapes

  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Gas Separation By Absorption (AREA)
  • Pens And Brushes (AREA)
  • Safety Valves (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

A fluid capable of generating pressure waves circulates inside a high-pressure fluid circuit. Said pressure waves can generate pressure peaks which can damage the high-pressure fluid circuit. According to the invention, a pressure wave attenuator (14) comprising a cylinder, a rod (22) and several plates (24) is provided in order to reduce the pressure waves and the pressure peaks. The plates (23) are disposed and embodied in such a way that a narrow passage inside the cylinder is permitted thereby. The narrow passage modifies the regular movement of fluid into an irregular movement of fluid, reducing the pressure peaks by 50 % of their initial value.

Description

Circuit d'injection de fluide à haute pression High pressure fluid injection circuit
La présente invention concerne un circuit d'injection de fluide à haute pression L'invention a pour but d'augmenter la performance du circuit d'injection de fluide à haute pression L'invention est plus particulièrement destinée au domaine de l'automobile mais peut également s'appliquer dans d'autres domaines Dans le domaine de l'automobile, ce circuit permet d injecter un fluide a haute pression a l'intérieur d'au moins un cylindre d'un moteur Dans ce cas, le fluide est un carburant Un circuit d'injection de fluide comporte un réservoir de fluide, une pompe hydraulique d'injection de fluide à basse pression (environ 10 bars soit environ 1 000 000 de Pascals) et au moins un injecteur-pompe Le réservoir, la pompe d'injection et l'injecteur-pompe sont reliés par des conduits permettant au fluide de circuler depuis le réservoir via la pompe d'injection jusqu'à l'injecteur-pompe pour ensuite circuler de nouveau et revenir, pour son surplus, dans le réservoir La pompe prélevé un fluide provenant du réservoir et augmente la pression de ce fluide jusqu'à une basse pression Dans un exemple, cette basse pression est sous une pression de 10 bars Ce fluide sous basse pression est ensuite expulsé de la pompe d'injection à travers les conduits Parmi les conduits du circuit, un distributeur répartit ce fluide sous basse pression à différents injecteurs- pompes Puis chaque injecteur-pompe augmente la pression jusqu'à 300 bars maximum et l'injecte dans son propre cylindre à la pression de 2050 bars maximum après ouverture d'une electrovanne Un circuit d'injection comportant de tels injecteurs-pompes pouvant délivrer un fluide à haute pression présente l'avantage d'être plus performant qu'un circuit comportant une pompe d'injection délivrant une pression d'injection plus faible Dans un exemple, une haute pression d'injection peut correspondre à environ 2000 bars Cependant, à haute pression, la pompe ou les conduits du circuit peuvent s'abîmer, et la performance d'un tel circuit diminue sensiblementThe present invention relates to a high pressure fluid injection circuit The invention aims to increase the performance of the high pressure fluid injection circuit The invention is more particularly intended for the automotive field but can also applicable in other fields In the automobile field, this circuit makes it possible to inject a high pressure fluid inside at least one cylinder of an engine In this case, the fluid is a fuel A fluid injection circuit comprises a fluid reservoir, a hydraulic pump for injecting fluid at low pressure (approximately 10 bars or approximately 1,000,000 of Pascals) and at least one injector-pump The reservoir, the pump injection and the injector-pump are connected by conduits allowing the fluid to circulate from the reservoir via the injection pump to the injector-pump to then circulate again and return, for its surplus, in the reservoir La pump removed a fluid coming from the reservoir and increases the pressure of this fluid to a low pressure In an example, this low pressure is under a pressure of 10 bars This fluid under low pressure is then expelled from the injection pump through the conduits Among the conduits of the circuit, a distributor distributes this fluid under low pressure to different injectors-pumps Then each injector-pump increases the pressure up to 300 bars maximum and injects it into its own cylinder at the pressure of 2050 bars maximum after opening of an electrovalve An injection circuit comprising such injector-pumps capable of delivering a high pressure fluid has the advantage of being more efficient than a circuit comprising an injection pump delivering a lower injection pressure In an example, a high injection pressure can correspond to approximately 2000 bars However, at high pressure, the pump or the lines of the circuit can be damaged, and the performance of such a circuit decreases significantly
Dans l'invention, on a recherche la cause de ces αetenorations et on a cherche en particulier a renforcer les divers éléments du circuit Ceci a ete en vain ou, autrement, a grand frais On a alors eu l'idée de détecter l'allure temporelle transitoire de la pression régnant dans le circuit lors de son fonctionnement.In the invention, we sought the cause of these deteriorations and we sought in particular to reinforce the various elements of the circuit This was in vain or, otherwise, at great expense We then had the idea of detecting the pace transient temporal pressure prevailing in the circuit during its operation.
Il est apparu alors que la délivrance d'un fluide à haute pression pouvait entraîner la formation d'une onde de pression. Cette onde de pression est la conséquence d'une ouverture et d'une fermeture rapide de l'électrovanne de l'injecteur-pompe. Suite à la fermeture rapide de l'électrovanne, une onde de pression peut naître et se propager le long du fluide, et dans le sens inverse de l'écoulement du fluide.It then appeared that the delivery of a high pressure fluid could cause the formation of a pressure wave. This pressure wave is the consequence of a rapid opening and closing of the solenoid valve of the injector-pump. Following the rapid closing of the solenoid valve, a pressure wave may arise and propagate along the fluid, and in the opposite direction of the flow of the fluid.
Cette onde de pression peut également entraîner la formation de pics de pression. Lorsque ces pics de pression sont trop élevés, il peut arriver que ces pics endommagent des éléments contenus dans le circuit d'injection, diminuant les performances du circuit d'injection à haute pression. Par exemple, des pics de pressions de 60 bars peuvent être obtenus pour des pressions délivrées à 2 000 bars et endommager les éléments contenus dans le circuit d'injection. Dans l'état de la technique, les circuits d'injection de fluide n'étaient pas affectés par cette onde de pression du fait que la mise sous pression du fluide était réalisée à basse pression et du fait que les éléments contenus dans ces circuits étaient suffisamment solides pour ne pas être abîmés par ces ondes de pressions. Pour limiter l'endommagement des éléments contenus dans un circuit d'injection de fluide sous pression et en particulier de fluide à haute pression, il aurait pu être possible de réaliser des conduits plus larges et plus épais. Cependant cette solution aurait rendu encombrante l'utilisation d'un tel circuit d'injection de fluide dans un véhicule. Elle n'aurait de toute façon pas résolu le problème de la pompe.This pressure wave can also cause pressure peaks to form. When these pressure peaks are too high, it can happen that these peaks damage elements contained in the injection circuit, reducing the performance of the high pressure injection circuit. For example, pressure peaks of 60 bars can be obtained for pressures delivered at 2,000 bars and damage the elements contained in the injection circuit. In the prior art, the fluid injection circuits were not affected by this pressure wave because the pressurization of the fluid was carried out at low pressure and because the elements contained in these circuits were strong enough not to be damaged by these pressure waves. To limit the damage to the elements contained in a pressurized fluid injection circuit and in particular of high pressure fluid, it could have been possible to make wider and thicker conduits. However, this solution would have made the use of such a fluid injection circuit in a vehicle cumbersome. It would not have solved the pump problem anyway.
Pour atténuer ces ondes de pression potentiellement génératrices de pics de pression, l'invention prévoit en conséquence un amortisseur d'ondes de pression interposé dans les conduits du circuit d'injection de fluide à haute pression. Dans un exemple, cet amortisseur est réalisé de telle manière qu'il oblige le fluide à suivre en plusieurs voies des chemins de longueur différentes. La direction du fluide est telle que le fluide doit passer à travers des sections de passage étroites pour que le mouvement du fluide s'accélère. En s'accélérant ce mouvement de fluide crée des turbulences. Ces turbulences rompent le mouvement régulier du fluide, atténuant alors l'onde de pression et les pics de pression qui en résultent. Dans cet exemple, l'amortisseur comporte un cylindre, a l'intérieur duquel est disposée une tige Cette tige est munie de plateaux, lesquels plateaux délimitent des compartiments ouverts Le fluide circule à travers ces compartiments par I intermédiaire de sections de passage étroites L'invention a donc pour objet un circuit d'injection de fluide à haute pression comportant une pompe d'injection de fluide à basse pression reliée par des conduits à un réservoir d'une part, et à au moins un injecteur-pompe destine à délivrer le fluide à forte pression d'autre part, caractérisé en ce qu'il comporte un amortisseur d'ondes de pression interposé entre une sortie de la pompe en direction de l'injecteur-pompe et l'injecteur-pompeTo attenuate these pressure waves potentially generating pressure peaks, the invention therefore provides a pressure wave damper interposed in the conduits of the high pressure fluid injection circuit. In one example, this damper is produced in such a way that it forces the fluid to follow paths of different length in several ways. The direction of the fluid is such that the fluid must pass through narrow passage sections for the movement of the fluid to accelerate. By accelerating this movement of fluid creates turbulence. These turbulences break the regular movement of the fluid, thus attenuating the pressure wave and the resulting pressure peaks. In this example, the shock absorber comprises a cylinder, inside of which a rod is arranged. This rod is provided with plates, which plates define open compartments The fluid circulates through these compartments by means of narrow passage sections L ' invention therefore relates to a high pressure fluid injection circuit comprising a low pressure fluid injection pump connected by conduits to a reservoir on the one hand, and to at least one injector-pump intended to deliver the high pressure fluid on the other hand, characterized in that it comprises a pressure wave damper interposed between an outlet of the pump in the direction of the pump injector and the pump injector
L'invention sera mieux comprise à la lecture de la description qui suit et à l'examen des figures qui l'accompagnent Celles-ci ne sont présentées qu'à titre indicatif et nullement limitatif de l'invention Les figures montrentThe invention will be better understood on reading the description which follows and on examining the figures which accompany it. These are only given by way of indication and in no way limit the invention. The figures show
- Figure 1 une représentation schématique d'un circuit d'injection de fluide à haute pression, selon I invention ,FIG. 1 a schematic representation of a high pressure fluid injection circuit according to the invention,
- Figure 2 une représentation graphique d'au moins un ordre de commande d'une éiectrovanne en fonction du temps, selon l'invention ,FIG. 2 a graphical representation of at least one order for controlling a solenoid valve as a function of time, according to the invention,
- Figure 3 une coupe longitudinale d'un amortisseur d'onde de pression, selon l'invention , - Figure 4 une coupe transversale d'un amortisseur d'onde de pression, selon l'invention ,- Figure 3 a longitudinal section of a pressure wave damper, according to the invention, - Figure 4 a cross section of a pressure wave damper, according to the invention,
- Figure 5 une représentation tridimensionnelle d'un amortisseur d'onde, selon l'invention ,FIG. 5 a three-dimensional representation of a wave damper according to the invention,
- Figure 6 une représentation schématique d'une onde de pression en fonction de la distance parcourue, selon l'invention ,FIG. 6 a schematic representation of a pressure wave as a function of the distance traveled, according to the invention,
- Figure 7 une représentation graphique d'une onde de pression en fonction du temps- Figure 7 a graphical representation of a pressure wave as a function of time
La figure 1 montre un circuit d'injection de fluide a haute pression 1 comportant une pompe-d'injection 2 de fluide à basse pression reliée par des conduits 3 1 et 3 a un réservoir 6 de fluide 5 et à au moins un injecteur- pompe 8 respectivement, selon l'inventionFIG. 1 shows a high pressure fluid injection circuit 1 comprising a low pressure fluid injection pump 2 connected by conduits 3 1 and 3 to a reservoir 6 of fluid 5 and to at least one injector- pump 8 respectively, according to the invention
La pompe 2 est incorporée dans un corps 4 Une alimentation en fluide dans un tel circuit s'effectue de la manière suivante La pompe 2 aspire le fluide 5 contenu dans le réservoir 6 par le conduit 3 1 Dans un exemple, il peut s'agir d'un réservoir de carburant tel que le gazole Une fois monte en pression à l'intérieur de la pompe 2, le fluide 5 est envoyé à travers des conduits 3. Dans un exemple, la pompe basse pression 2 augmente la pression du fluide de 10 bars environ. Les conduits 3 comportent ICI un distributeur 7 relié à au moins un injecteur-pompe 8. Dans un exemple, le distributeur 7 est relié à quatre injecteurs-pompes 8 L'injecteur-pompe 8 est relié à un cylindre 9 d'un moteur (non représenté) à l'intérieur duquel coulisse un piston 9 1 L'injecteur-pompe est destiné à expulser un volume de fluide à forte pression par un orifice (non représenté) obturé au repos par une aiguille d'injecteur (non représentée) Dans un exemple, la pression du fluide au moment de son expulsion de l'injecteur-pompe est de 2050 bars L'injecteur- pompe 8 est également muni d'une électrovanne 10 dont l'ouverture 11 et la fermeture 12 sont commandées par un ordre Oi, figure 2 Par exemple, l'ouverture 11 et la fermeture 12 de l'électrovanne 10 de chacun des injecteurs-pompes 8 sont commandées par un ordre de commande O1 à O4, figures 1 et 2 L'électrovanne permet ainsi d'autoriser une alimentation intermittente en fluide de chaque injecteur-pompe. En réponse à cet ordre, l'électrovanne 10 peut se trouver en phase d'ouverture 11 ou de fermeture 12. L'ouverture peut être prédéterminée pendant une période 13 transitoire de façon à permettre une pré-injection de fluide dans l'injecteur-pompe Le fluide est ensuite comprimé à l'intérieur de l'injecteur-pompe jusqu'à 300 bars. A 300 bars, l'aiguille de l'injecteur est délogée de l'orifice de l'injecteur- pompe Le fluide est alors expulsé dans le cylindre du moteur à une pression de 2050 bars environ étant donné que l'arrivée de carburant dans l'injecteur- pompe est supérieure à la quantité pouvant s'échapper par l'orifice de l'injecteur-pompeThe pump 2 is incorporated in a body 4 A fluid supply in such a circuit is carried out in the following manner The pump 2 sucks the fluid 5 contained in the reservoir 6 by the conduit 3 1 In one example, it may be of a fuel tank such as diesel Once mounted in pressure inside the pump 2, the fluid 5 is sent through conduits 3. In one example, the low pressure pump 2 increases the pressure of the fluid by approximately 10 bars. The conduits 3 HERE have a distributor 7 connected to at least one pump injector 8. In one example, the distributor 7 is connected to four pump injectors 8 The pump injector 8 is connected to a cylinder 9 of an engine ( not shown) inside which a piston slides 9 1 The injector-pump is intended to expel a volume of fluid at high pressure through an orifice (not shown) closed at rest by an injector needle (not shown) In an example, the fluid pressure at the time of its expulsion from the pump injector is 2050 bars The pump injector 8 is also provided with a solenoid valve 10, the opening 11 and closing 12 of which are controlled by an order Oi, Figure 2 For example, the opening 11 and the closing 12 of the solenoid valve 10 of each of the pump injectors 8 are controlled by a control order O1 to O4, Figures 1 and 2 The solenoid valve thus allows to authorize an intermittent supply of fluid to each injector-pump. In response to this order, the solenoid valve 10 may be in the opening 11 or closing 12 phase. The opening may be predetermined for a transient period 13 so as to allow a pre-injection of fluid into the injector- pump The fluid is then compressed inside the pump injector up to 300 bars. At 300 bar, the needle of the injector is dislodged from the orifice of the pump injector. The fluid is then expelled into the cylinder of the engine at a pressure of approximately 2050 bars since the arrival of fuel in the injector-pump is greater than the quantity that can escape through the orifice of the injector-pump
Un retour de fluide en direction du réservoir s'effectue de la manière suivante Le fluide circule dans le sens contraire du sens suivi par le fluide lors de l'alimentation du circuit lorsque l'électrovanne s'ouvre à nouveau L'excès de fluide nécessaire pour une montée en pression efficace à l'intérieur de l'injecteur-pompe retourne alors dans le réservoir par d'autres conduits (non représentés) différents des conduits 3A return of fluid towards the reservoir takes place in the following manner The fluid circulates in the opposite direction to the direction followed by the fluid during the supply of the circuit when the solenoid valve opens again The excess of fluid required for an effective pressure rise inside the injector-pump then returns to the tank by other conduits (not shown) different from the conduits 3
Selon l'invention, le circuit d'injection de fluide a haute pression 1 comporte un amortisseur d'onde de pression 14 L'amortisseur 14 est interposé entre une sortie de la pompe 2 en direction de l'injecteur-pompe 8 et l'injecteur-pompe 8, figure 1 Plus précisément et de préférence, l'amortisseur 14 est situé a l'intérieur du corps 4 de la pompe 2, à l'endroit où se situe la sortie de la pompe en direction de l'injecteur-pompe 8 II pourrait toutefois être dispose à un autre endroit le long des conduits 3, de préférence en amont du distributeur 7 Cet amortisseur 14, comporte dans un exemple un cylindre 15, figure 4 avec une partie externe 16 pleine et une partie centrale 17 creuse Une coupe transversale de l'amortisseur permet de visualiser une section transversale 18 de la partie centrale 17 du cylindre 15, figure 4 Sur cette section transversale 18, il est possible de distinguer un périmètre 19, une surface 20, et un centre 21 Dans un exemple préfère, le cylindre 15 est circulaire, figure 4, mais ce cylindre 15 peut également être rectangulaireAccording to the invention, the high-pressure fluid injection circuit 1 comprises a pressure wave damper 14 The damper 14 is interposed between an outlet of the pump 2 in the direction of the injector-pump 8 and the pump injector 8, FIG. 1 More precisely and preferably, the damper 14 is located inside the body 4 of the pump 2, at the place where the outlet of the pump is located in the direction of the injector-pump 8 It could however be placed at another place along conduits 3, preferably upstream of the distributor 7 This shock absorber 14, in one example comprises a cylinder 15, FIG. 4 with an external portion 16 full and a central portion 17 hollow A cross section of the shock absorber makes it possible to view a cross section 18 of the central part 17 of the cylinder 15, FIG. 4 On this cross section 18, it is possible to distinguish a perimeter 19, a surface 20, and a center 21 In a preferred example, the cylinder 15 is circular, FIG. 4, but this cylinder 15 can also be rectangular
A l'endroit où se situe le centre 21 de cette partie centrale 17 est insérée une tige 22, figures 3, 5 Cette tige 22 comporte au moins un plateau 23 La coupe transversale de l'amortisseur 14 permet également de visualiser une section transversale 24 du plateau 23, figure 4 Cette section transversale 24 permet de distinguer un périmètre 25 et une surface 26 La tige 22 comporte plusieurs plateaux 23, figures 3, 4 et 5. Sur la figure 3, on peut visualiser un plateau 23 en pointillé situé en dessous du plateau 23 présent dans le plan du dessin Dans l'exemple préféré, la tige 22 comporte six plateaux 23 et a une longueur de soixante millimètres, figures 3 et 5 Les plateaux 23 sont disposés sur la tige 22 les uns à la suite des autres selon une même distance 27 A l'intérieur de la partie centrale 17 du cylindre 15, les plateaux 23 délimitent des compartiments 28 Dans l'exemple préféré, les plateaux 23 ont la forme d'un disque coupé selon une corde et délimitent cinq compartiments 28, figures 3 4 et 5At the place where the center 21 of this central part 17 is located, a rod 22 is inserted, FIGS. 3, 5 This rod 22 comprises at least one plate 23 The cross section of the damper 14 also makes it possible to view a cross section 24 of the plate 23, FIG. 4 This cross section 24 makes it possible to distinguish a perimeter 25 and a surface 26 The rod 22 comprises several plates 23, FIGS. 3, 4 and 5. In FIG. 3, one can visualize a plate 23 in dotted lines located at below the plate 23 present in the drawing plane In the preferred example, the rod 22 comprises six plates 23 and has a length of sixty millimeters, Figures 3 and 5 The plates 23 are arranged on the rod 22 one after the other in a same distance 27 inside of the central portion 17 of the cylinder 15, the plates 23 delimit compartments 28 in the preferred example, the trays 23 have the form of a disc cut along a chord and define five compartments 28, figures 3 4 and 5
Les plateaux 23 sont identiques et les normales à leurs cordes sont orientées selon un angle 29 différent d'un plateau a un autre par rapport à un axe 30 défini par la tige 22 et passant par le centre 21 De préférence, les plateaux 23 sont orientes, alternativement, les uns par rapport aux autres selon un angle de 180° par rapport a l'axe 30 de la tige 22, figures 4 et 5 Les plateaux 23 sont disposes perpendiculairement a l'axe 30, figure 3 Dans un autre exemple, il serait possible de prévoir une orientation d'un angle différent de 180° produisant une progression hélicoïdale de ces orientationsThe plates 23 are identical and the normal ones to their strings are oriented at an angle 29 different from one plate to another with respect to an axis 30 defined by the rod 22 and passing through the center 21 Preferably, the plates 23 are oriented , alternately, with respect to each other at an angle of 180 ° with respect to the axis 30 of the rod 22, FIGS. 4 and 5 The plates 23 are arranged perpendicular to the axis 30, FIG. 3 In another example, it would be possible to provide an orientation of an angle other than 180 ° producing a helical progression of these orientations
Selon I invention, la surface 26 du plateau 23 correspond au moins à la moitié de la surface 20 oe la section 18 de la partie centrale 17 du cylindre 15. Le périmètre 25 du plateau 23 épouse également partiellement le périmètre 19 de la partie centrale 17 de la section 18 du cylindre 15, figure 4.According to the invention, the surface 26 of the plate 23 corresponds to at least half of the surface 20 oe the section 18 of the central part 17 of the cylinder 15. The perimeter 25 of the plate 23 also partially matches the perimeter 19 of the central part 17 of the section 18 of the cylinder 15, FIG. 4.
Le périmètre 25 du plateau 23 possède une portion 31 et une portionThe perimeter 25 of the plate 23 has a portion 31 and a portion
32. La portion 31 épouse le périmètre 19 du cylindre 15 alors que la portion 32 ne l'épouse pas, figure 4.32. The portion 31 follows the perimeter 19 of the cylinder 15 while the portion 32 does not match it, FIG. 4.
Le périmètre 19 du cylindre 15 possède également une portion 33 épousant le plateau 23 et une portion 34 ne l'épousant pas. Ainsi la portion 32 du plateau 23 et la portion 34 du cylindre 15 délimitent un orifice latéral 35 par rapport à l'axe 30 défini par la tige 22, figure 4. Du fait de la présence de cet orifice latéral 35 sur chaque plateau 23, les compartiments 28 sont ouverts à l'intérieur du cylindre 15, figure 3.The perimeter 19 of the cylinder 15 also has a portion 33 matching the plate 23 and a portion 34 not matching it. Thus the portion 32 of the plate 23 and the portion 34 of the cylinder 15 delimit a lateral orifice 35 with respect to the axis 30 defined by the rod 22, FIG. 4. Due to the presence of this lateral orifice 35 on each plate 23, the compartments 28 are open inside the cylinder 15, FIG. 3.
Le plateau 23 est réalisé de telle manière que, selon un axe 38 perpendiculaire à l'axe 30 défini par la tige 22, un point de la portion 31 du périmètre 25 du plateau 23 est séparé d'un autre point de la portion 32 du périmètre 25 d'une distance 36.The plate 23 is made in such a way that, along an axis 38 perpendicular to the axis 30 defined by the rod 22, a point of the portion 31 of the perimeter 25 of the plate 23 is separated from another point of the portion 32 of the perimeter 25 of a distance 36.
De plus, un point de la portion 32 est séparé d'un point de la portionIn addition, a point of the portion 32 is separated from a point of the portion
34 selon l'axe 38 perpendiculaire à l'axe 30 de la tige 22 d'une distance 37.34 along the axis 38 perpendicular to the axis 30 of the rod 22 by a distance 37.
Dans l'exemple préféré, la distance 36 est de 4,5 millimètres et la distanceIn the preferred example, the distance 36 is 4.5 millimeters and the distance
37 est de 1 ,5 millimètres, pour un diamètre de 6 millimètres à plus ou moins 20%. On obtient ainsi un bon compromis entre la taille et la robustesse.37 is 1.5 millimeters, for a diameter of 6 millimeters plus or minus 20%. We thus obtain a good compromise between size and robustness.
Lorsque le fluide 5 sous basse pression est injecté à l'intérieur des conduits 3, le fluide 5 subit sur son parcours une légère dépression, figure 6. Cette légère dépression, ou perte de charge, est représentée par une courbe 39 linéaire décroissante en fonction de la distance parcourue à l'intérieur des conduits 3. Le fluide 5 en mouvement percute l'électrovanne 10 au moment de la fermeture de cette dernière. Le fluide 5 est injecté à l'intérieur du cylindre 9 par une ouverture et une fermeture rapide de l'électrovanne 10. La fermeture 12 rapide de l'électrovanne 10 commandée par l'ordre O provoque une onde de pression 40, figure 6. Cette onde 40 se déplace dans le sens contraire du déplacement du fluide 5 dans le cas de l'alimentation en fluide du circuit. Ce déplacement en sens contraire se produit depuis l'injecteur- pompe 8 jusqu'à l'endroit où se situe la pompe 2.When the fluid 5 under low pressure is injected inside the conduits 3, the fluid 5 undergoes a slight depression on its route, FIG. 6. This slight depression, or pressure drop, is represented by a decreasing linear curve 39 as a function of the distance traveled inside the conduits 3. The moving fluid 5 strikes the solenoid valve 10 when the latter is closed. The fluid 5 is injected inside the cylinder 9 by a rapid opening and closing of the solenoid valve 10. The rapid closing 12 of the solenoid valve 10 controlled by the order O causes a pressure wave 40, FIG. 6. This wave 40 moves in the opposite direction of the movement of the fluid 5 in the case of the supply of fluid to the circuit. This movement in the opposite direction occurs from the pump injector 8 to the place where the pump 2 is located.
Cette onde de pression 40 se déplace dans l'espace et dans le temps, figures 6 et 7. Cette onde de pression 40 émet au moins un pic de pression 41 suite à la fermeture de l'électrovanne 10, figure 7. Par exemple, sur la figure 7 sont représentés quatre pics de pression 41 d'une onde de pression 40 résultant de l'ouverture 11 et de la fermeture 12 successives de l'électrovanne 10 de chacun des quatre injecteurs-pompes 8 de fluide. Ces pics de pression 41 peuvent atteindre jusqu'à une pression de 60 bars. Les orifices latéraux 35 et la disposition des plateaux 23 les uns au- dessus des autres créent des rétrécissements et des élargissements de sections à l'intérieur du cylindre 15 de l'amortisseur 14. Ces rétrécissements et ces élargissements de sections obligent le fluide à rompre sa trajectoire rectiligne. L'onde inverse doit passer par les mêmes endroits. Le fluide 5 sortant de la pompe 2 pénètre à l'intérieur de l'amortisseurThis pressure wave 40 moves in space and in time, FIGS. 6 and 7. This pressure wave 40 emits at least one pressure peak 41 following the closing of the solenoid valve 10, FIG. 7. For example, on the FIG. 7 shows four pressure peaks 41 of a pressure wave 40 resulting from the successive opening 11 and closing 12 of the solenoid valve 10 of each of the four fluid injector pumps 8. These pressure peaks 41 can reach up to a pressure of 60 bars. The lateral openings 35 and the arrangement of the plates 23 one above the other create narrowing and widening of sections inside the cylinder 15 of the shock absorber 14. These narrowing and these widening of sections force the fluid to rupture its straight path. The reverse wave must pass through the same places. The fluid 5 leaving the pump 2 penetrates inside the damper
14. La trajectoire 42 du fluide à l'intérieur du cylindre 15 a une forme sinusoïdale, figure 3. A l'extrémité opposée où le fluide 5 entre, l'onde de pression 40 pénètre à l'intérieur du cylindre 15 et décrit une même trajectoire 43 visible en pointillés sur la figure 3. Le fluide 5 sous pression crée des turbulences à l'intérieur des compartiments 28 après son passage à travers les orifices latéraux 35 atténuant sensiblement les pics de pressions de l'onde de pression jusqu'à 50% de leur valeur maximale. 14. The path 42 of the fluid inside the cylinder 15 has a sinusoidal shape, FIG. 3. At the opposite end where the fluid 5 enters, the pressure wave 40 penetrates inside the cylinder 15 and describes a same trajectory 43 visible in dotted lines in FIG. 3. The fluid 5 under pressure creates turbulence inside the compartments 28 after it passes through the lateral orifices 35 substantially reducing the pressure peaks of the pressure wave up to 50% of their maximum value.

Claims

REVENDICATIONS
1 - Circuit d'injection de fluide à haute pression(1 ) comportant une pompe d'injection de fluide à basse pression (2) reliée par des conduits (3, 3.1 ) à un réservoir (6) d'une part, et à au moins un injecteur-pompe (8) destiné à délivrer le fluide à forte pression d'autre part, caractérisé en ce qu'il comporte un amortisseur d'ondes de pression (14) interposé entre une sortie de la pompe en direction de l'injecteur-pompe et l'injecteur-pompe.1 - High pressure fluid injection circuit (1) comprising a low pressure fluid injection pump (2) connected by conduits (3, 3.1) to a reservoir (6) on the one hand, and to at least one injector-pump (8) intended to deliver the fluid at high pressure on the other hand, characterized in that it comprises a pressure wave damper (14) interposed between an outlet of the pump in the direction of the pump injector and pump injector.
2 - Circuit (1 ) selon la revendication 1 caractérisé en ce que l'amortisseur est placé dans un corps (4) de la pompe (2).2 - Circuit (1) according to claim 1 characterized in that the damper is placed in a body (4) of the pump (2).
3 - Circuit (1 ) selon l'une des revendications 1 à 2 caractérisé en ce que l'amortisseur (14) comporte un cylindre (15) dans lequel est insérée une tige (22) portant au moins un plateau (23).3 - Circuit (1) according to one of claims 1 to 2 characterized in that the damper (14) comprises a cylinder (15) in which is inserted a rod (22) carrying at least one plate (23).
4 - Circuit (1 ) selon la revendication 3 caractérisé en ce qu'une surface (26) d'une section (24) du plateau (23) correspond au moins à la moitié d'une surface (20) d'une section (18) d'une partie centrale (17) du cylindre (15) et qu'un périmètre (25) du plateau (23) épouse partiellement un périmètre (19) de la section (18) du cylindre (15).4 - Circuit (1) according to claim 3 characterized in that a surface (26) of a section (24) of the plate (23) corresponds to at least half of a surface (20) of a section ( 18) of a central part (17) of the cylinder (15) and that a perimeter (25) of the plate (23) partially matches a perimeter (19) of the section (18) of the cylinder (15).
5 - Circuit (1 ) selon la revendication 4 caractérisé en ce qu'une distance (36) séparant un premier point d'une portion (31 ) du périmètre (25) du plateau (23) épousant le périmètre (19) du cylindre (15) d'une part, d'un deuxième point du périmètre (25) du plateau (23) n'épousant pas le périmètre (19) du cylindre (15) d'autre part, cette distance étant mesurée selon un axe (38) perpendiculaire à l'axe (30) de la tige (22) est de 4,5 millimètres.5 - Circuit (1) according to claim 4 characterized in that a distance (36) separating a first point from a portion (31) of the perimeter (25) of the plate (23) matching the perimeter (19) of the cylinder ( 15) on the one hand, of a second point of the perimeter (25) of the plate (23) not matching the perimeter (19) of the cylinder (15) on the other hand, this distance being measured along an axis (38 ) perpendicular to the axis (30) of the rod (22) is 4.5 millimeters.
6 - Circuit (1 ) selon l'une des revendications 4 à 5 caractérisé en ce qu'une distance (37) séparant un deuxième point d'une portion (32) du périmètre (25) du plateau (23) n'épousant pas le périmètre (19) du cylindre (15) d'une part, d'un troisième point d'une portion (31 ) du périmètre (19) du cylindre (15) n'épousant pas le périmètre (25) du plateau (23), cette distance étant mesurée selon un axe (38) perpendiculaire à l'axe (30) de la tige (22) est de 1 ,5 millimètres.6 - Circuit (1) according to one of claims 4 to 5 characterized in that a distance (37) separating a second point from a portion (32) of the perimeter (25) of the plate (23) not matching the perimeter (19) of the cylinder (15) on the one hand, of a third point of a portion (31) of the perimeter (19) of the cylinder (15) not matching the perimeter (25) of the plate (23 ), this distance being measured along an axis (38) perpendicular to the axis (30) of the rod (22) is 1.5 millimeters.
7 - Circuit (1 ) selon l'une des revendications 3 à 6 caractérisé en ce que la tige (22) comporte plusieurs plateaux (23) et que ces plateaux (23) sont disposés sur la tige (22) les uns à la suite des autres selon une même distance (27).7 - Circuit (1) according to one of claims 3 to 6 characterized in that the rod (22) comprises several plates (23) and that these plates (23) are arranged on the rod (22) one after the other others according to the same distance (27).
8 - Circuit (1 ) selon l'une des revendications 3 à 7 caractérisé en ce que les plateaux (23) sont identiques et sont orientés selon un angle (29) différent d'un plateau (23) à un autre par rapport à un axe (30) défini par la tige (22).8 - Circuit (1) according to one of claims 3 to 7 characterized in that the plates (23) are identical and are oriented at an angle (29) different from one plate (23) to another relative to a axis (30) defined by the rod (22).
9 - Circuit (1 ) selon la revendication 8 caractérisé en ce que les plateaux (23) sont orientés les uns par rapport aux autres selon un angle de 180° par rapport à l'axe (30).9 - Circuit (1) according to claim 8 characterized in that the plates (23) are oriented relative to each other at an angle of 180 ° relative to the axis (30).
10 - Circuit (1 ) selon l'une des revendications 9 à 10 caractérisé en ce que le plateau (23) est disposé perpendiculairement à l'axe (30).10 - Circuit (1) according to one of claims 9 to 10 characterized in that the plate (23) is arranged perpendicular to the axis (30).
11 - Circuit (1 ) selon . la revendication . 4 et selon l'une des revendications 8 à 10 caractérisé en ce qu'une portion (32) du périmètre (25) du plateau (23) qui n'épouse pas le périmètre (19) du cylindre (15) ainsi qu'une portion (34) du périmètre (25) du cylindre (15) qui n'est pas épousé par le périmètre (25) du plateau (23) délimitent un orifice latéral (35) par rapport à l'axe (30).11 - Circuit (1) according to. claim . 4 and according to one of claims 8 to 10 characterized in that a portion (32) of the perimeter (25) of the plate (23) which does not match the perimeter (19) of the cylinder (15) as well as a portion (34) of the perimeter (25) of the cylinder (15) which is not matched by the perimeter (25) of the plate (23) delimit a lateral orifice (35) relative to the axis (30).
12 - Circuit (1 ) selon les revendications 3 à 11 caractérisé en ce que la tige (22) comporte six plateaux (23) délimitant cinq compartiments (28) ouverts à l'intérieur du cylindre (15). 12 - Circuit (1) according to claims 3 to 11 characterized in that the rod (22) comprises six plates (23) delimiting five compartments (28) open inside the cylinder (15).
EP03735460A 2002-05-29 2003-05-26 High-pressure fluid injection circuit Expired - Lifetime EP1511931B1 (en)

Applications Claiming Priority (3)

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IT2002TO000453A ITTO20020453A1 (en) 2002-05-29 2002-05-29 HIGH PRESSURE FLUID INJECTION CIRCUIT.
ITTO20020453 2002-05-29
PCT/EP2003/005482 WO2003100245A1 (en) 2002-05-29 2003-05-26 High-pressure fluid injection circuit

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EP1511931B1 EP1511931B1 (en) 2007-02-21

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JP (1) JP2005527738A (en)
KR (1) KR100973177B1 (en)
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AT (1) ATE354727T1 (en)
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DE60311987D1 (en) 2007-04-05
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ES2280757T3 (en) 2007-09-16
ITTO20020453A1 (en) 2003-12-01
EP1511931B1 (en) 2007-02-21
DE60311987T2 (en) 2007-10-31
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WO2003100245A1 (en) 2003-12-04
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RU2004139023A (en) 2006-02-20
BR0305021A (en) 2004-11-09
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CN1666019A (en) 2005-09-07
US20050224052A1 (en) 2005-10-13

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