FR2967727A1 - Fuel feeding and distribution device for bi-fuel internal combustion engine of motor vehicle, has injection manifold including inner and outer chambers for supply and distribution of petrol and compressed natural gas, respectively - Google Patents

Fuel feeding and distribution device for bi-fuel internal combustion engine of motor vehicle, has injection manifold including inner and outer chambers for supply and distribution of petrol and compressed natural gas, respectively Download PDF

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Publication number
FR2967727A1
FR2967727A1 FR1059516A FR1059516A FR2967727A1 FR 2967727 A1 FR2967727 A1 FR 2967727A1 FR 1059516 A FR1059516 A FR 1059516A FR 1059516 A FR1059516 A FR 1059516A FR 2967727 A1 FR2967727 A1 FR 2967727A1
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France
Prior art keywords
fuel
distribution
chamber
injectors
supply
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FR1059516A
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French (fr)
Inventor
Michel Caruel
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Priority to FR1059516A priority Critical patent/FR2967727A1/en
Publication of FR2967727A1 publication Critical patent/FR2967727A1/en
Withdrawn legal-status Critical Current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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0684—High pressure fuel injection systems; Details on pumps, rails or the arrangement of valves in the fuel supply and return systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F02D19/0692—Arrangement of multiple injectors per combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0697—Arrangement of fuel supply systems on engines or vehicle bodies; Components of the fuel supply system being combined with another device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
    • 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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel composition
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0275—Arrangement of common rails
    • F02M63/0285—Arrangement of common rails having more than one common rail
    • F02M63/029—Arrangement of common rails having more than one common rail per cylinder bank, e.g. storing different fuels or fuels at different pressure levels per cylinder bank
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10078—Connections of intake systems to the engine
    • F02M35/10085—Connections of intake systems to the engine having a connecting piece, e.g. a flange, between the engine and the air intake being foreseen with a throttle valve, fuel injector, mixture ducts or the like
    • 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
    • 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
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The device has an injection manifold (5) including an inner chamber (26) and an outer chamber (16) having common walls. The inner chamber includes volume for the supply and distribution of a fuel i.e. petrol (E), and the outer chamber includes volume for the supply and distribution of another fuel i.e. compressed natural gas (GNV), where the chambers are sealed to each other. Each of the chambers communicates via radial tubular connectors (12, 13, 21-23) with a separate set of injectors associated with the fuels, respectively.

Description

DISPOSITIF D'ALIMENTATION ET DE DISTRIBUTION EN CARBURANT D'UN MOTEUR THERMIQUE BI-CARBURANT DE VEHICULE. [0001 La présente invention concerne un dispositif d'alimentation et de distribution en carburant d'un moteur thermique bi-carburant de véhicule, en particulier mais non exclusivement un dispositif d'alimentation et de distribution en carburant d'un moteur thermique de véhicule fonctionnant avec un carburant A (par exemple Essence) et avec un carburant B (par exemple gaz naturel), lequel gaz naturel est désigné « GNV » dans la suite du texte. [0002 Par exemple, les véhicules automobiles à bi-carburation essence/GNV sont réalisés sur la base de véhicules à essence auxquels ont été ajoutés un système d'alimentation en GNV et une centrale électronique d'injection capable de gérer les deux carburants essence et GNV. [0009] L'adaptation d'un moteur thermique essence au carburant gazeux (GNV) entraîne une transformation profonde de l'architecture du moteur. C'est sous la forme d'ensembles conditionnés que la technologie du carburant GNV est implantée sur le moteur thermique ou dans le compartiment moteur du véhicule. [0004] Mais cette implantation n'est pas toujours possible. Le montage des organes liés à l'alimentation et à la distribution du carburant GNV peut s'avérer difficile ou même incompatible avec le volume disponible dans le compartiment moteur. [0005i On a déjà cherché à perfectionner la structure des dispositifs de distribution de carburant des moteurs à combustion interne pour en diminuer l'encombrement. [0006] Ainsi, le document FR 2 664 863 décrit une tuyauterie monobloc destinée à être utilisée dans un système de distribution de carburant de type à injection pour véhicule à moteur. Cette tuyauterie comprend un tube intérieur constituant un conduit haute pression et présentant un premier passage pour l'envoi de carburant d'un réservoir à un cylindre du moteur du véhicule, un tube intermédiaire constituant un conduit basse pression placé radialement à distance DEVICE FOR SUPPLYING AND DELIVERING FUEL FROM A BI-FUEL THERMAL ENGINE OF A VEHICLE. The present invention relates to a device for supplying and dispensing fuel to a bi-fuel vehicle heat engine, particularly but not exclusively a fuel supply and dispensing device for a running vehicle engine. with a fuel A (for example gasoline) and with a fuel B (for example natural gas), which natural gas is designated "GNV" in the rest of the text. For example, gasoline / CNG bi-gasoline motor vehicles are made on the basis of gasoline vehicles which have been added a CNG supply system and an electronic injection unit capable of handling the two gasoline fuels and CNG. [0009] The adaptation of a gasoline engine to the gaseous fuel (CNG) causes a profound transformation of the engine architecture. It is in the form of packaged assemblies that the CNG fuel technology is implanted on the engine or in the engine compartment of the vehicle. But this implantation is not always possible. The assembly of organs related to the supply and distribution of the CNG fuel can be difficult or even incompatible with the volume available in the engine compartment. [0005] We have already sought to improve the structure of the fuel dispensing devices of internal combustion engines to reduce their size. Thus, the document FR 2,664,863 describes a one-piece pipe for use in an injection-type fuel delivery system for a motor vehicle. This pipe comprises an inner tube constituting a high pressure conduit and having a first passage for sending fuel from a reservoir to a cylinder of the vehicle engine, an intermediate tube constituting a low pressure conduit placed radially at a distance

du tube intérieur, coaxialement à ce dernier, de manière à former un second passage entre ces tubes pour le retour de la partie inutilisée du carburant dans le réservoir et un tube extérieur constituant un conduit de récupération de vapeur placé radialement à distance dudit tube intermédiaire, coaxialement à ce dernier, de manière à former entre eux un troisième passage pour le retour de carburant vaporisé ou évaporé dans le réservoir. [0007] Toutefois, une telle tuyauterie n'est pas conçue pour alimenter un moteur bi-carburant. [000s] Le but de la présente invention est de fournir un dispositif d'alimentation en carburant d'un moteur thermique bi-carburant, qui présente un encombrement sensiblement identique à celui d'un dispositif classique d'alimentation et de distribution d'un moteur thermique. [000s] Un autre but de la présente invention est de fournir un tel dispositif d'alimentation en carburant, qui soit d'architecture relativement simple, et qui entraîne un allègement de la masse totale du moteur thermique. [oo1oi Enfin, c'est également un but de la présente invention de fournir un tel dispositif d'alimentation en carburant, qui soit de conception, de réalisation et de montage simples, et qui soit économique. [oo11] Pour parvenir à ces buts, la présente invention a pour objet un dispositif d'alimentation et de distribution en carburant d'un moteur thermique bi-carburant, et ce nouveau dispositif est constitué par une rampe d'injection formée de deux chambres distinctes ayant des parois communes. Un premier volume, intérieur, constitue la première chambre pour l'alimentation et la distribution d'un premier carburant A et un espace compris entre un second volume, extérieur au premier volume, et ledit premier volume constitue une seconde chambre pour l'alimentation et la distribution d'un second carburant B. Les deux chambres sont étanches entre elles et chacune des deux chambres communique, par l'intermédiaire de raccords tubulaires sensiblement radiaux, avec un jeu distinct d'injecteurs associés du premier et du second carburant, respectivement. the inner tube, coaxially with the latter, so as to form a second passage between these tubes for the return of the unused portion of the fuel in the tank and an outer tube constituting a vapor recovery conduit placed radially at a distance from said intermediate tube, coaxially with the latter, so as to form between them a third passage for the return of vaporized fuel or evaporated in the tank. However, such a pipe is not designed to feed a dual-fuel engine. The object of the present invention is to provide a device for supplying fuel to a bi-fuel combustion engine, which has a bulk substantially identical to that of a conventional device for feeding and delivering a fuel. thermal motor. Another object of the present invention is to provide such a fuel supply device, which is relatively simple architecture, and which causes a lightening of the total mass of the engine. Finally, it is also an object of the present invention to provide such a fuel supply device which is simple in design, construction and assembly, and economical. [Oo11] To achieve these aims, the present invention relates to a device for supplying and dispensing fuel of a dual fuel engine, and this new device is constituted by an injection rail formed by two chambers distinct with common walls. A first volume, inside, constitutes the first chamber for the supply and distribution of a first fuel A and a space between a second volume, outside the first volume, and said first volume constitutes a second chamber for the supply and the distribution of a second fuel B. The two chambers are sealed together and each of the two chambers communicates, via substantially radial tubular connectors, with a separate set of associated injectors of the first and second fuel, respectively.

[0012] Les injecteurs du premier et du second carburant peuvent être fixés sur la culasse du moteur thermique, ou bien sur le répartiteur d'admission du moteur thermique. [0013] Les injecteurs du premier carburant présentent une géométrie extérieure qui peut avantageusement être identique à celle des injecteurs du second carburant. [0014] Chaque injecteur est fixé, par une de ses extrémités, dans la partie d'extrémité d'un desdits raccords tubulaires sensiblement radiaux de la rampe d'injection. [0015] Une extrémité de chaque injecteur est maintenue dans la partie d'extrémité d'un raccord tubulaire sensiblement radial de la rampe d'injection, et il est avantageusement prévu, pour chaque injecteur, un joint torique assurant l'étanchéité de la liaison entre le raccord tubulaire et l'injecteur. [0016] Selon le mode préféré de réalisation de l'invention, l'arrivée du premier carburant A est située dans une section d'extrémité de la première chambre et l'arrivée du second carburant B est située dans la section d'extrémité de la seconde chambre qui est opposée à ladite section d'extrémité de la première chambre, c'est-à-dire que l'arrivée du premier carburant est d'un côté de la rampe d'injection tandis que l'arrivée du second carburant est de l'autre côté de ladite rampe. [0017] Toutefois, en variante, l'arrivée du carburant A et l'arrivée du carburant B peuvent être situées d'un même coté de la rampe d'injection. [0018] Selon le mode préféré de réalisation de l'invention également, la première chambre est une chambre d'alimentation et de distribution en GNV, tandis que la seconde chambre est une chambre d'alimentation et de distribution en essence. [0019] La présente invention a aussi pour objet un véhicule automobile à moteur thermique bi-carburant, qui présente un dispositif d'alimentation et de distribution en carburant conforme à celui décrit ci-dessus dans ses grandes lignes. The injectors of the first and second fuel can be attached to the cylinder head of the engine, or on the inlet distributor of the engine. The injectors of the first fuel have an outer geometry which may advantageously be identical to that of the injectors of the second fuel. Each injector is fixed, by one of its ends, in the end portion of one of said substantially radial tubular connections of the injection rail. One end of each injector is held in the end portion of a substantially radial tubular connection of the injection rail, and it is advantageously provided for each injector, an O-ring sealing the connection between the tubular connection and the injector. According to the preferred embodiment of the invention, the arrival of the first fuel A is located in an end section of the first chamber and the arrival of the second fuel B is located in the end section of the first chamber. the second chamber opposite said end section of the first chamber, i.e. the arrival of the first fuel is on one side of the fuel rail while the arrival of the second fuel is on the other side of said ramp. However, alternatively, the arrival of fuel A and the arrival of fuel B may be located on the same side of the injection rail. According to the preferred embodiment of the invention also, the first chamber is a feed chamber and distribution of CNG, while the second chamber is a feed chamber and distribution gasoline. The present invention also relates to a motor vehicle with a dual fuel engine, which has a fuel supply and distribution device in accordance with that described above in outline.

[0020] D'autres buts, avantages et caractéristiques de l'invention apparaîtront dans la description qui suit d'un mode de réalisation préféré, non limitatif de l'objet et de la portée de la présente demande de brevet, accompagnée de dessins dans lesquels : ^ la figure 1 est une vue en perspective d'une culasse de moteur thermique bi-carburant avec le dispositif d'alimentation et de distribution en carburant selon le principe de la présente invention, - la figure 2 est une vue en coupe transversale de la culasse et du dispositif d'alimentation et de distribution de carburant de la figure 1, selon la ligne 11-11 de la figure 1 - la figure 3 est une vue en perspective du dispositif d'alimentation et de distribution de carburant selon l'invention, représenté sur les figures 1 et 2, - la figure 4 est une vue en coupe longitudinale du dispositif d'alimentation et de distribution de carburant de la figure 3, selon la ligne IV-IV de la figure 3, et - la figure 5 est une vue en perspective, partiellement coupée, du dispositif d'alimentation et de distribution de carburant des figures 3 et 4, avec les injecteurs du premier et du second carburant montés sur la rampe d'injection. [0021] En référence au dessin de la figure 1, on a représenté la culasse d'un moteur thermique fonctionnant à l'essence et au GNV, référencée 1. [0022] L'alimentation et la distribution des deux carburants du moteur sont réalisées par une rampe d'injection commune, bi-carburant, selon le principe de la présente invention. [0023] Cette rampe d'injection bi-carburant, référencée 5 de manière générale, est formée, comme montré sur les figures 2 à 5, de deux tubes coaxiaux : Other objects, advantages and features of the invention will appear in the following description of a preferred embodiment, not limiting the object and scope of the present patent application, accompanied by drawings in 1 is a perspective view of a dual-fuel engine cylinder head with the fuel supply and delivery device according to the principle of the present invention; FIG. 2 is a cross-sectional view; FIG. 1 is a perspective view of the fuel supply and dispensing device according to FIG. 1, FIG. FIG. 4 is a longitudinal sectional view of the fuel supply and dispensing device of FIG. 3 along line IV-IV of FIG. 3, and figure 5 is a view in pers pective, partially cut, the fuel supply and distribution device of Figures 3 and 4, with the injectors of the first and second fuel mounted on the injection rail. Referring to the drawing of Figure 1, there is shown the cylinder head of an engine running on gasoline and CNG, referenced 1. [0022] The supply and distribution of the two engine fuels are realized by a common injection rail, bi-fuel, according to the principle of the present invention. This bi-fuel injection manifold, referenced 5 generally, is formed, as shown in Figures 2 to 5, of two coaxial tubes:

- un premier tube 20, intérieur, définissant un volume intérieur constituant une première chambre 26 pour l'alimentation et la distribution du GNV, et - un second tube 10, extérieur au premier tube 20, l'espace compris entre le tube intérieur 20 et le tube extérieur 10 constituant une chambre 16 pour l'alimentation et la distribution de l'essence. [0024] Les deux chambres 16 et 26 sont étanches entre elles et communiquent, chacune, avec un jeu distinct d'injecteurs associés, à savoir la chambre 26 avec les injecteurs GNV référencés collectivement IGNV, et la chambre 16 avec les injecteurs essence référencés collectivement IE. [0025] L'arrivée du GNV (flèche « GNV » des figures 1, 3 et 4) dans la chambre 26 se fait par une section d'extrémité 25 du tube intérieur 20, tandis que l'arrivée de l'essence (flèche « E » sur les figures 1, 3 et 4) dans la chambre 16 se fait par une section d'extrémité 15 du tube extérieur 10. [0026] Les injecteurs de gaz naturel IGNv et les injecteurs essence IE peuvent être fixés sur la culasse 1, ou sur le répartiteur d'admission 3. Ils peuvent tous présenter une géométrie extérieure sensiblement identique ou voisine. [oo27] Le montage des injecteurs IGNv et des injecteurs IE est similaire. Une des extrémités de chaque injecteur est montée dans un alésage de la culasse 1, ou dans un alésage du répartiteur d'admission 3, comme mentionné ci-dessus, et l'autre extrémité de l'injecteur est montée dans la partie d'extrémité d'un raccord tubulaire, sensiblement radial, appartenant à la rampe d'injection 5, lequel raccord tubulaire est, de préférence, monobloc avec la rampe d'injection 5. [0028] Un joint torique assure l'étanchéité de la liaison des injecteurs sur les raccords tubulaires. [0029] Ainsi, les trois injecteurs essence IE sont fixés par une extrémité aux raccords tubulaires 11, 12 et 13 qui communiquent avec la chambre 16, tandis que les trois injecteurs de gaz naturel IGNV sont fixés par une extrémité aux raccords tubulaires 21, 22 et 23 qui communiquent avec la chambre 26. a first inner tube defining an internal volume constituting a first chamber for the supply and distribution of the CNG, and a second tube outside the first tube, the space between the inner tube and the outer tube 10 constituting a chamber 16 for the supply and distribution of gasoline. The two chambers 16 and 26 are sealed together and communicate, each with a separate set of associated injectors, namely the chamber 26 with the NGV injectors referenced collectively IGNV, and the chamber 16 with the fuel injectors collectively referenced IE. The arrival of the CNG (arrow "GNV" of Figures 1, 3 and 4) in the chamber 26 is by an end section 25 of the inner tube 20, while the arrival of gasoline (arrow "E" in Figures 1, 3 and 4) in the chamber 16 is by an end section 15 of the outer tube 10. IGNv natural gas injectors and fuel injectors IE can be fixed on the cylinder head 1, or on the intake distributor 3. They may all have a substantially identical or neighboring external geometry. [oo27] The installation of IGNv injectors and IE injectors is similar. One of the ends of each injector is mounted in a bore of the cylinder head 1, or in a bore of the intake manifold 3, as mentioned above, and the other end of the injector is mounted in the end portion. a tubular connection, substantially radial, belonging to the injection rail 5, which tubular connection is preferably integral with the injection rail 5. An O-ring seals the connection of the injectors on tubular connections. Thus, the three fuel injectors IE are fixed at one end to the tubular connectors 11, 12 and 13 which communicate with the chamber 16, while the three natural gas injectors IGNV are fixed at one end to the tubular connectors 21, 22 and 23 who communicate with room 26.

[0030] Les références 31 et 32 désignent des pattes de fixation de la rampe d'injection 5, pour la fixation de cette dernière sur la culasse 1 du moteur. [0031] La rampe d'injection 5 peut présenter une forme différente de celle décrite ci-dessus donnée à titre d'exemple non limitatif de l'objet et de la portée de la présente invention, et être réalisée par des procédés différents, connus, tels que, par exemple, par fonderie, par soudage des éléments constituants, par usinage, etc. [0032] Sur la rampe d'injection 5 peuvent être fixés et intégrés divers appareils nécessaires au fonctionnement bi-carburant, tels que des capteurs de pression, des systèmes de sécurité, des retours de carburant, etc. [0033] La rampe d'injection 5 permet d'alimenter et de distribuer en essence et en GNV les injecteurs spécifiques essence et GNV, respectivement, tout en ayant un encombrement sensiblement du même ordre qu'une rampe d'injection essence classique. Elle est formée d'un corps qui réunit, d'une manière relativement compacte, les deux chambres essence et GNV, étanches entre elles. [0034] Le dispositif de rampe d'injection bi-carburant décrit ci-dessus présente de nombreux avantages, parmi lesquels les avantages suivants : - il permet de simplifier l'architecture générale d'un moteur thermique fonctionnant en bi-carburant, en particulier fonctionnant à l'essence et au GNV, ce qui a pour conséquence de réduire le prix de revient du moteur bi- carburant, - il réduit la masse totale du moteur bi-carburant par la suppression de pièces spécifiques à l'alimentation et à la distribution du carburant GNV, cette réduction de masse ayant pour résultat de réduire la consommation de carburant du véhicule et de diminuer les émissions des gaz polluants, - il est de conception, de réalisation et de montage simples. [0035] Bien entendu, la présente invention n'est pas limitée aux modes de réalisation décrits et représentés ci-dessus à titre d'exemples ; d'autres modes de réalisation peuvent être conçus par l'homme de métier sans sortir du cadre et de la portée de la présente invention. The references 31 and 32 designate fastening lugs of the injection rail 5 for fixing the latter on the cylinder head 1 of the engine. The injection manifold 5 may have a shape different from that described above given by way of non-limiting example of the object and the scope of the present invention, and may be carried out by different, known methods. such as, for example, by casting, welding components, machining, etc. On the injection rail 5 can be fixed and integrated various devices required for dual-fuel operation, such as pressure sensors, safety systems, fuel returns, etc.. The injection manifold 5 allows to feed and distribute gasoline and CNG gasoline and NGV specific injectors, respectively, while having a footprint substantially the same as a conventional gasoline fuel rail. It is formed of a body that combines, in a relatively compact manner, the two chambers gasoline and CNG, sealed between them. The bi-fuel injection ramp device described above has many advantages, among which the following advantages: it simplifies the general architecture of a thermal engine operating in bi-fuel, in particular operating on gasoline and CNG, which has the effect of reducing the cost price of the dual-fuel engine, - it reduces the total mass of the bi-fuel engine by removing specific parts to the fuel and to the fuel. distribution of the CNG fuel, this mass reduction resulting in reducing the fuel consumption of the vehicle and reducing the emissions of gaseous pollutants, - it is of simple design, construction and assembly. Of course, the present invention is not limited to the embodiments described and shown above as examples; other embodiments may be devised by those skilled in the art without departing from the scope and scope of the present invention.

Claims (9)

REVENDICATIONS1. Dispositif d'alimentation et de distribution en carburant d'un moteur thermique bi-carburant, caractérisé en ce qu'il est constitué par une rampe d'injection (5) formée de deux chambres, distinctes, ayant des parois communes, un premier volume, intérieur, formant la première chambre (26) pour l'alimentation et la distribution d'un premier carburant A et un espace compris entre un second volume, extérieur au premier volume, et ledit premier volume formant la seconde chambre (16) pour l'alimentation et la distribution du second carburant B, les deux chambres (16, 26) étant étanches entre elles et chacune des deux chambres (16, 26) communiquant, par l'intermédiaire de raccords tubulaires sensiblement radiaux (11, 12, 13 ; 21, 22, 23), avec un jeu distinct d'injecteurs associés (IE, IGNV) du premier et du second carburant, respectivement. REVENDICATIONS1. Device for supplying and dispensing fuel to a bi-fuel combustion engine, characterized in that it consists of an injection ramp (5) formed of two distinct chambers having common walls, a first volume interior forming the first chamber (26) for feeding and dispensing a first fuel A and a space between a second volume outside the first volume and said first volume forming the second chamber (16) for the first volume supply and distribution of the second fuel B, the two chambers (16, 26) being sealed together and each of the two chambers (16, 26) communicating, via substantially radial tubular connections (11, 12, 13; 21, 22, 23), with a separate set of associated injectors (IE, IGNV) of the first and second fuel, respectively. 2. Dispositif selon la revendication 1, caractérisé en ce que les injecteurs (IE, IGNV) du premier et du second carburant sont fixés sur la culasse (1) du moteur thermique. 2. Device according to claim 1, characterized in that the injectors (IE, IGNV) of the first and second fuel are fixed on the cylinder head (1) of the engine. 3. Dispositif selon la revendication 1, caractérisé en ce que les injecteurs (IE, IGNV) du premier et du second carburant sont fixés sur le répartiteur d'admission (3) du moteur thermique. 3. Device according to claim 1, characterized in that the injectors (IE, IGNV) of the first and second fuel are fixed on the inlet distributor (3) of the engine. 4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les injecteurs du premier carburant présentent une géométrie extérieure identique à celle des injecteurs du second carburant. 4. Device according to any one of claims 1 to 3, characterized in that the injectors of the first fuel have an outer geometry identical to that of the injectors of the second fuel. 5. Dispositif selon la revendication 1, caractérisé en ce que chaque injecteur (IE, IGNV) est fixé, par une de ses extrémités, dans la partie d'extrémité d'un desdits raccords tubulaires sensiblement radiaux (11, 12, 13 ; 21, 22, 23) de la rampe d'injection (5). 5. Device according to claim 1, characterized in that each injector (IE, IGNV) is fixed, at one of its ends, in the end portion of one of said substantially radial tubular connectors (11, 12, 13; , 22, 23) of the injection rail (5). 6. Dispositif selon la revendication 5, caractérisé en ce qu'il est prévu pour chaque injecteur (IE, IGNV) un joint torique assurant l'étanchéité. 6. Device according to claim 5, characterized in that there is provided for each injector (IE, IGNV) an O-ring sealing. 7. Dispositif selon la revendication 1, caractérisé en ce que l'arrivée du premier carburant A est située dans une section d'extrémité (25) de la premièrechambre (26) et l'arrivée du second carburant B est située dans la section d'extrémité (15) de la seconde chambre (16), qui est opposée à ladite section d'extrémité (25) de la première chambre (26). 7. Device according to claim 1, characterized in that the arrival of the first fuel A is located in an end section (25) of the first chamber (26) and the arrival of the second fuel B is located in the section d end (15) of the second chamber (16), which is opposed to said end section (25) of the first chamber (26). 8. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la première chambre (26) est une chambre d'alimentation et de distribution en GNV, tandis que la seconde chambre (16) est une chambre d'alimentation et de distribution en essence. 8. Device according to any one of claims 1 to 7, characterized in that the first chamber (26) is a feed chamber and distribution of CNG, while the second chamber (16) is a feed chamber and distribution in essence. 9. Véhicule automobile à moteur thermique bi-carburant, caractérisé en ce qu'il présente un dispositif d'alimentation et de distribution en carburant conforme à l'une quelconque des revendications précédentes. 9. A motor vehicle with a bi-fuel combustion engine, characterized in that it has a fuel supply and distribution device according to any one of the preceding claims.
FR1059516A 2010-11-19 2010-11-19 Fuel feeding and distribution device for bi-fuel internal combustion engine of motor vehicle, has injection manifold including inner and outer chambers for supply and distribution of petrol and compressed natural gas, respectively Withdrawn FR2967727A1 (en)

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US5239964A (en) * 1992-05-11 1993-08-31 Illinois Tool Works Inc. Concentric fuel line system
US20020195088A1 (en) * 2000-06-07 2002-12-26 Radu Oprea Dual fuel metering and supply system for internal combustion engines
DE102006054463A1 (en) * 2006-11-18 2008-05-21 Daimler Ag Bivalent, spark-ignition internal combustion engine i.e. four-cylinder engine, operating method, involves injecting liquid and gaseous fuel in selected operating area of engine and implementing operation of engine with fuel
JP2009235983A (en) * 2008-03-27 2009-10-15 Denso Corp Fuel injection device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5239964A (en) * 1992-05-11 1993-08-31 Illinois Tool Works Inc. Concentric fuel line system
US20020195088A1 (en) * 2000-06-07 2002-12-26 Radu Oprea Dual fuel metering and supply system for internal combustion engines
DE102006054463A1 (en) * 2006-11-18 2008-05-21 Daimler Ag Bivalent, spark-ignition internal combustion engine i.e. four-cylinder engine, operating method, involves injecting liquid and gaseous fuel in selected operating area of engine and implementing operation of engine with fuel
JP2009235983A (en) * 2008-03-27 2009-10-15 Denso Corp Fuel injection device

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DE102012112847B4 (en) * 2012-01-05 2015-04-02 Suzuki Motor Corporation Dual fuel engine

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