EP0543704B1 - Method to improve the vaporization of fuel in an internal combustion engine and engine for implementing such method - Google Patents

Method to improve the vaporization of fuel in an internal combustion engine and engine for implementing such method Download PDF

Info

Publication number
EP0543704B1
EP0543704B1 EP92403040A EP92403040A EP0543704B1 EP 0543704 B1 EP0543704 B1 EP 0543704B1 EP 92403040 A EP92403040 A EP 92403040A EP 92403040 A EP92403040 A EP 92403040A EP 0543704 B1 EP0543704 B1 EP 0543704B1
Authority
EP
European Patent Office
Prior art keywords
auxiliary
fuel
engine
auxiliary passage
burned gases
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.)
Expired - Lifetime
Application number
EP92403040A
Other languages
German (de)
French (fr)
Other versions
EP0543704A1 (en
Inventor
Bertrand Gatellier
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP0543704A1 publication Critical patent/EP0543704A1/en
Application granted granted Critical
Publication of EP0543704B1 publication Critical patent/EP0543704B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/20—Feeding recirculated exhaust gases directly into the combustion chambers or into the intake runners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/36—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for adding fluids other than exhaust gas to the recirculation passage; with reformers

Definitions

  • the present invention relates to a method and an internal combustion engine with controlled ignition arranged to promote the vaporization of fuel during the intake phases.
  • the main objective of the improvement sought is to reduce the harmful components in the exhaust gases of the cylinders and in particular nitrogen oxides, as well as unburnt hydrocarbons.
  • Processes which make it possible to reduce harmful exhausts, the essential principle of which consists in recycling part of the burnt gases coming from the combustion chambers of an engine.
  • the recycling can be external, the burnt gases being recycled by pipes connecting the exhaust pipes to the intake pipes, under the control of valves for example, or even inside by the effect of a particular distribution timing or by means of additional valves etc.
  • the use of injection into the engines to obtain better control of the richness of the fuel mixture has the effect of degrading the quality of the latter and of increasing the discharge of unburnt hydrocarbons.
  • each combustion chamber is connected in a controlled manner with the intake pipe or the exhaust pipe by an auxiliary duct opening into one or the other in the immediate vicinity of the intake valve or exhaust.
  • a mode in communication with the combustion chamber can be established by opening the auxiliary duct therein by interposing an auxiliary valve and / or a control plug.
  • the auxiliary duct communicates the intake pipe and the exhaust pipe in the immediate vicinity of their respective valves, the communication being controlled by a valve or a plug interposed on this auxiliary duct.
  • This direct communication between the two pipes allows a better dosage of the fraction of burned gases reinjected which is the richest in harmful discharges.
  • the object of the process according to the invention is essentially to promote the vaporization of fuel in an internal combustion engine with positive ignition comprising at least one cylinder associated with a fuel mixture intake pipe, an exhaust pipe and an auxiliary pipe. associated with control means, making it possible to carry out, during the intake phases, a controlled recycling of a fraction of burnt gases comprising an injection of fuel into a flow of burnt gases readmitted at each cycle via said auxiliary duct.
  • the method involves injecting fuel into the flow of burnt gas intermittently escaping from each cylinder in the auxiliary duct at the opening of an auxiliary control valve and it is characterized in that the auxiliary duct communicates the combustion chamber with the intake pipe.
  • a multi-point injection is carried out, the fuel being injected into each intake pipe of the engine, in a flow of burnt gases coming from an auxiliary duct. corresponding, via an auxiliary control valve.
  • this fuel injection is carried out sequentially during the closing time of each intake valve.
  • the essential idea of the invention is to take advantage of the high temperature of the burnt gases recycled to better vaporize the fuel. This being injected in a time interval where a current of recycled hot burnt gases, coming from the cylinder via an auxiliary duct under the control of an auxiliary valve, circulates towards the intake ducts, a much better vaporization is obtained than in the classic case where the injection takes place in a mixture comprising mainly fresh air and a relatively small portion of recycled burnt gases. The combustion and the efficiency of the engine are therefore appreciably improved.
  • the invention also relates to an internal combustion engine comprising at least one cylinder associated with a fuel air intake pipe, an exhaust pipe and an auxiliary duct associated with control means, making it possible to perform during the phases intake, controlled recycling of a fraction of burnt gases.
  • This device comprises fuel injection means arranged so that the injected fuel is in contact with the burnt gases recycled via the auxiliary duct.
  • the engine includes an auxiliary valve for controlling the exhaust of the burnt gases from the cylinder in the auxiliary duct and it is characterized in that the auxiliary duct communicates the combustion chamber with the intake pipe.
  • the engine comprises for example multi-point injection means, auxiliary conduits associated respectively with the different cylinders, each of these auxiliary conduits being provided with an auxiliary control valve.
  • Fig.1 an application of the device to an engine comprising at least one cylinder 1 in which slides a piston 2, which communicates by a valve 3 with an exhaust pipe 4.
  • the cylinder also communicates via an inlet valve 5 with cyclic opening with an inlet pipe 6.
  • the two valves 3 and 5 are associated with control means of a known type not shown, such as cam lifters for example.
  • a control means such as a plug 8, is interposed on the auxiliary duct 7 to dose at each cycle, the fraction to be recycled from the gases burned during the previous cycle, as described in the aforementioned European patent application.
  • To promote the vaporization of the fuel there is an injector 9 in the connection zone of the auxiliary duct 7 with the intake pipe 6.
  • the nose of the injector 9 is preferably placed at the very level of the intersection between the duct 7 and the pipe 6 and the fuel injection is synchronized with an opening of the plug 8 so that the fuel is injected into the flow of hot burnt gases leaving the auxiliary duct 7.
  • the latter is advantageously bent so that the flow of burnt gases carries the vaporized fuel to the intake valve 5.
  • the auxiliary duct 7 communicates the combustion chamber 1 with the intake pipe, the recycling of burnt gases being controlled by an auxiliary valve 10 whose lifting time interval LR , (Fig.2) is intermediate between the LE and admission LA time intervals, as described in the aforementioned European patent application.
  • this window LR can be moved more or less between two offset positions LR1 and LR2 to either of the LE and LA intake and exhaust time intervals.
  • a control valve 8 can also be interposed on the auxiliary duct for metering the fraction of recycled burnt gases, in which the fuel is vaporized by means of the injector 9.

Description

La présente invention concerne un procédé et un moteur à combustion interne et allumage commandé agencé pour favoriser la vaporisation de carburant durant les phases d'admission.The present invention relates to a method and an internal combustion engine with controlled ignition arranged to promote the vaporization of fuel during the intake phases.

L'amélioration recherchée a essentiellement pour objet de réduire les composants nocifs dans les gaz d'échappement des cylindres et notamment les oxydes d'azote, ainsi que les hydrocarbures imbrûlés.The main objective of the improvement sought is to reduce the harmful components in the exhaust gases of the cylinders and in particular nitrogen oxides, as well as unburnt hydrocarbons.

On connaît des procédés permettant de réduire les échappements nocifs dont Le principe essentiel consiste à recycler une partie des gaz brûlés issus des chambres de combustion d'un moteur. Le recyclage peut être extérieur, les gaz brûlés étant recyclés par des conduites reliant les pipes d'échappement aux pipes d'admission, sous le contrôle de vannes par exemple, ou bien encore intérieur par l'effet d'un calage de distribution particulier ou au moyen de soupapes supplémentaires etc. L'utilisation de l'injection dans les moteurs pour obtenir un meilleur contrôle de la richesse du mélange carbûré, a pour effet de dégrader la qualité de celui-ci et d'augmenter les rejets d'hydrocarbures imbrûlés.Processes are known which make it possible to reduce harmful exhausts, the essential principle of which consists in recycling part of the burnt gases coming from the combustion chambers of an engine. The recycling can be external, the burnt gases being recycled by pipes connecting the exhaust pipes to the intake pipes, under the control of valves for example, or even inside by the effect of a particular distribution timing or by means of additional valves etc. The use of injection into the engines to obtain better control of the richness of the fuel mixture has the effect of degrading the quality of the latter and of increasing the discharge of unburnt hydrocarbons.

Par le brevet japonais JP 61.112.773, qui est considéré comme l'état de la technique le plus proche, on connait un moteur à combustion interne pourvu d'un système de recyclage de gaz brûlés adapté à mélanger une part des gaz brûlés à recycler prélevés dans la pipe d'échappement mélangés éventuellement avec de l'air non carburé dérivé de la pipe d'admission, avant de réadmettre ce mélange par la pipe d'admission, dans le cône d'injection de l'injecteur de façon à obtenir une meilleure gazéification ou atomisation par l'air.By Japanese patent JP 61,112,773, which is considered to be the closest state of the art, there is known an internal combustion engine provided with a burnt gas recycling system suitable for mixing part of the burnt gases to be recycled taken from the exhaust pipe possibly mixed with non-carburetted air derived from the intake pipe, before re-admitting this mixture through the intake pipe, into the injection cone of the injector so as to obtain better gasification or atomization by air.

Dans la demande de brevet européen EP-A-484206 publié le 06.05.92, par exemple, sont décrits un procédé et un dispositif permettant Le recyclage contrôlé en fonction de la charge, d'une fraction des gaz brûlés prélevés dans la pipe d'échappement d'un moteur à combustion interne, de façon à augmenter le rendement du moteur et réduire les rejets nocifs. A cet effet, on relie de façon contrôlée chaque chambre de combustion avec la pipe d'admission ou la pipe d'échappement par un conduit auxiliaire débouchant dans l'une ou l'autre à proximité immédiate de La soupape d'admission ou d'échappement. Suivant un mode de réalisation la communication avec la chambre de combustion peut être établie en faisant déboucher le conduit auxiliaire dans celle-ci en interposant une soupape auxiliaire et/ou un boisseau de commande. Suivant un autre mode de réalisation, le conduit auxiliaire fait communiquer la pipe d'admission et la pipe d'échappement au voisinage immédiat de leurs soupapes respectives, la communication étant contrôlée par une soupape ou un boisseau interposé sur ce conduit auxiliaire. Cette communication directe entre les deux pipes permet un meilleur dosage de la fraction de gaz brûlés réinjectée la plus riche en rejets nocifs.In the European patent application EP-A-484206 published on 06.05.92, for example, a method and a device are described allowing the controlled recycling, depending on the load, of a fraction of the burnt gases taken from the pipe. exhaust from an internal combustion engine, so as to increase engine efficiency and reduce harmful emissions. For this purpose, each combustion chamber is connected in a controlled manner with the intake pipe or the exhaust pipe by an auxiliary duct opening into one or the other in the immediate vicinity of the intake valve or exhaust. According to a mode in communication with the combustion chamber can be established by opening the auxiliary duct therein by interposing an auxiliary valve and / or a control plug. According to another embodiment, the auxiliary duct communicates the intake pipe and the exhaust pipe in the immediate vicinity of their respective valves, the communication being controlled by a valve or a plug interposed on this auxiliary duct. This direct communication between the two pipes allows a better dosage of the fraction of burned gases reinjected which is the richest in harmful discharges.

Le procédé selon l'invention a essentiellement pour objet de favoriser la vaporisation de carburant dans un moteur à combustion interne à allumage commandé comportant au moins un cylindre associé à une pipe d'admission de mélange carburé, une pipe d'échappement et un conduit auxiliaire associé à des moyens de contrôle, permettant d'effectuer durant les phases d'admission, un recyclage contrôlé d'une fraction de gaz brûlés comportant une injection de carburant dans un flux de gaz brûlés réadmis à chaque cycle via ledit conduit auxiliaire.The object of the process according to the invention is essentially to promote the vaporization of fuel in an internal combustion engine with positive ignition comprising at least one cylinder associated with a fuel mixture intake pipe, an exhaust pipe and an auxiliary pipe. associated with control means, making it possible to carry out, during the intake phases, a controlled recycling of a fraction of burnt gases comprising an injection of fuel into a flow of burnt gases readmitted at each cycle via said auxiliary duct.

Le procédé comporte l'injection de carburant dans le flux de gaz brûlés s'échappant par intermittence de chaque cylindre dans le conduit auxiliaire à l'ouverture d'une soupape auxiliaire de contrôle et il est caractérisé en ce que le conduit auxiliaire fait communiquer la chambre de combustion avec la pipe d'admission.The method involves injecting fuel into the flow of burnt gas intermittently escaping from each cylinder in the auxiliary duct at the opening of an auxiliary control valve and it is characterized in that the auxiliary duct communicates the combustion chamber with the intake pipe.

Suivant un premier mode de mise en oeuvre convenant pour un moteur à plusieurs cylindres, on procède à une injection multi-points, le carburant étant injecté dans chaque pipe d'admission du moteur, dans un flux de gaz brûlés issus d'un conduit auxiliaire correspondant, via une soupape auxiliaire de contrôle.According to a first embodiment suitable for an engine with several cylinders, a multi-point injection is carried out, the fuel being injected into each intake pipe of the engine, in a flow of burnt gases coming from an auxiliary duct. corresponding, via an auxiliary control valve.

De préférence, on procède cette injection de carburant de manière séquentielle pendant la durée de fermeture de chaque soupape d'admission.Preferably, this fuel injection is carried out sequentially during the closing time of each intake valve.

L'idée essentielle de L'invention est de profiter de la température élevée des gaz brûlés recyclés pour mieux vaporiser le carburant. Celui-ci étant injecté dans un intervalle de temps où un courant de gaz brûlés chauds recyclés, issus du cylindre via un conduit auxiliaire sous le contrôle d'une soupape auxiliaire, circule vers les conduits d'admission, on obtient une bien meilleure vaporisation que dans le cas classique où l'injection a Lieu dans un mélange comportant principalement de l'air frais et une portion relativement faible de gaz brûlés recyclés. On améliore donc sensiblement la combustion et le rendement du moteur.The essential idea of the invention is to take advantage of the high temperature of the burnt gases recycled to better vaporize the fuel. This being injected in a time interval where a current of recycled hot burnt gases, coming from the cylinder via an auxiliary duct under the control of an auxiliary valve, circulates towards the intake ducts, a much better vaporization is obtained than in the classic case where the injection takes place in a mixture comprising mainly fresh air and a relatively small portion of recycled burnt gases. The combustion and the efficiency of the engine are therefore appreciably improved.

L'invention concerne aussi un moteur à combustion interne comportant au moins un cylindre associé à une pipe d'admission d'air carburé, une pipe d'échappement et un conduit auxiliaire associé à des moyens de contrôle, permettant d'effectuer durant les phases d'admission, un recyclage contrôlé d'une fraction de gaz brûlés. Ce dispositif comporte des moyens d'injection de carburant disposés de manière que le carburant injecté soit au contact des gaz brûlés recyclés par l'intermédiaire du conduit auxiliaire. Le moteur comporte une soupape auxiliaire de contrôle de l'échappement des gaz brûlés issus du cylindre dans le conduit auxiliaire et il est caractérisé en ce que le conduit auxiliaire fait communiquer la chambre de combustion avec la pipe d'admission.The invention also relates to an internal combustion engine comprising at least one cylinder associated with a fuel air intake pipe, an exhaust pipe and an auxiliary duct associated with control means, making it possible to perform during the phases intake, controlled recycling of a fraction of burnt gases. This device comprises fuel injection means arranged so that the injected fuel is in contact with the burnt gases recycled via the auxiliary duct. The engine includes an auxiliary valve for controlling the exhaust of the burnt gases from the cylinder in the auxiliary duct and it is characterized in that the auxiliary duct communicates the combustion chamber with the intake pipe.

Dans le cas où il possède plusieurs cylindres, le moteur comporte par exemple des moyens d'injection multi-points, des conduits auxiliaires associés respectivement aux différents cylindres, chacun de ces conduits auxiliaires étant pourvus d'une soupape auxiliaire de contrôle.In the case where it has several cylinders, the engine comprises for example multi-point injection means, auxiliary conduits associated respectively with the different cylinders, each of these auxiliary conduits being provided with an auxiliary control valve.

D'autres caractéristiques et avantages de la méthode et du moteur selon l'invention apparaîtront mieux à la lecture de la description ci-après de modes de réalisation décrits à titre d'exemples non limitatifs, en se référant aux dessins annexés où :

  • la Fig.1 montre un mode de réalisation où le conduit auxiliaire communique avec la chambre de combustion par l'intermédiaire d'une soupape auxiliaire; et
  • la Fig.2 montre en fonction de la position angulaire du vilebrequin,
les courbes respectives de levée de la soupape d'échappement, de la soupape d'admission et de la soupape auxiliaire, dans le mode de réalisation de la Fig.1.Other characteristics and advantages of the method and of the engine according to the invention will appear better on reading the following description of embodiments described by way of nonlimiting examples, with reference to the appended drawings where:
  • Fig.1 shows an embodiment where the auxiliary duct communicates with the combustion chamber via an auxiliary valve; and
  • Fig. 2 shows as a function of the angular position of the crankshaft,
the respective lift curves of the exhaust valve, the intake valve and the auxiliary valve, in the embodiment of Fig. 1.

On voit sur la Fig.1 une application du dispositif à un moteur comportant au moins un cylindre 1 dans lequel coulisse un piston 2, qui communique par une soupape 3 avec une pipe d'échappement 4. Le cylindre communique aussi par l'intermédiaire d'une soupape d'admission 5 à ouverture cyclique avec une pipe d'admission 6. Aux deux soupapes 3 et 5 sont associés des moyens de commande d'un type connu non représentés, tels que des poussoirs à cames par exemple.We see in Fig.1 an application of the device to an engine comprising at least one cylinder 1 in which slides a piston 2, which communicates by a valve 3 with an exhaust pipe 4. The cylinder also communicates via an inlet valve 5 with cyclic opening with an inlet pipe 6. The two valves 3 and 5 are associated with control means of a known type not shown, such as cam lifters for example.

Un moyen de contrôle tel qu'un boisseau 8, est interposé sur le conduit auxiliaire 7 pour doser à chaque cycle, la fraction à recycler des gaz brûlés au cours du cycle précédent, comme il est décrit dans la demande de brevet européen précitée. Pour favoriser la vaporisation du carburant, on dispose un injecteur 9 dans la zone de raccordement du conduit auxiliaire 7 avec la pipe d'admission 6. Le nez de l'injecteur 9 est placé de préférence au niveau même de l'intersection entre le conduit 7 et la pipe 6 et l'on synchronise l'injection de carburant avec une ouverture du boisseau 8 de manière que le carburant soit injecté dans le flux de gaz brûlés chauds sortant du conduit auxiliaire 7. Celui-ci est avantageusement recourbé de façon que le flux de gaz brûlés entraîne le carburant vaporisé vers la soupape d'admission 5.A control means such as a plug 8, is interposed on the auxiliary duct 7 to dose at each cycle, the fraction to be recycled from the gases burned during the previous cycle, as described in the aforementioned European patent application. To promote the vaporization of the fuel, there is an injector 9 in the connection zone of the auxiliary duct 7 with the intake pipe 6. The nose of the injector 9 is preferably placed at the very level of the intersection between the duct 7 and the pipe 6 and the fuel injection is synchronized with an opening of the plug 8 so that the fuel is injected into the flow of hot burnt gases leaving the auxiliary duct 7. The latter is advantageously bent so that the flow of burnt gases carries the vaporized fuel to the intake valve 5.

Suivant le mode de réalisation de la Fig.1, le conduit auxiliaire 7 fait communiquer la chambre de combustion 1 avec la pipe d'admission, le recyclage de gaz brûlés étant contrôlé par une soupape auxiliaire 10 dont l'intervalle de temps de levée LR, (Fig.2) est intermédiaire entre les intervalles de temps d'échappement LE et d'admission LA, comme il est décrit dans la demande de brevet européen précitée. Par des moyens de commande appropriés, on peut déplacer plus ou moins cette fenêtre LR entre deux positions LR1 et LR2 décalées vers l'un ou l'autre des intervalles de temps d'admission et d'échappement LE et LA. Un boisseau de commande 8 peut aussi être interposé sur Le conduit auxiliaire pour Le dosage de la fraction de gaz brûlés recyclés, dans lequel on vaporise le carburant au moyen de l'injecteur 9.According to the embodiment of Fig.1, the auxiliary duct 7 communicates the combustion chamber 1 with the intake pipe, the recycling of burnt gases being controlled by an auxiliary valve 10 whose lifting time interval LR , (Fig.2) is intermediate between the LE and admission LA time intervals, as described in the aforementioned European patent application. By appropriate control means, this window LR can be moved more or less between two offset positions LR1 and LR2 to either of the LE and LA intake and exhaust time intervals. A control valve 8 can also be interposed on the auxiliary duct for metering the fraction of recycled burnt gases, in which the fuel is vaporized by means of the injector 9.

Claims (5)

  1. A method for improving fuel vaporisation in a controlled-ignition internal combustion engine having at least one cylinder (1) linked to an admission pipe (6) for carburetted air, an exhaust pipe (4) and an auxiliary passage (7) linked to control means (8, 10), providing a controlled system whereby, during the admission phases, a fraction of burned gases discharged from the engine is recycled by injecting fuel into a flow of burned gases readmitted with each cycle via the said auxiliary passage, in which the fuel is injected into the flow of burned gases discharged intermittently from each cylinder in the auxiliary passage when an auxiliary control valve (10) is opened, characterised in that the auxiliary passage (7) provides a communication link between the combustion chamber and the admission pipe.
  2. A method as claimed in claim 1, suitable for a multi-cylinder engine, characterised in that a system of multi-point injection is set up whereby the fuel is injected in each admission pipe (6) of the engine into a flow of burned gases coming directly from the corresponding auxiliary passage (7) via an auxiliary control valve (10).
  3. A method as claimed in one of claims 1 or 2, characterised in that the said fuel injection is effected in sequence during the time when each admission valve is closed.
  4. An internal combustion engine having at least one cylinder (1) linked to an admission pipe (6) for carburetted air, an exhaust pipe (4) and an auxiliary passage (7) linked to control means (8, 10), providing a controlled system whereby a fraction of burned gases is recycled during the admission phases, and fuel injection means (9) positioned so that the fuel is injected into a flow of recycled burned gases by means of the auxiliary passage, wherein the engine has an auxiliary valve (10) to control the exhaust of burned gases from the cylinder into the auxiliary passage (7), characterised in that the auxiliary passage (7) provides a communication link between the combustion chamber and the admission pipe.
  5. An engine as claimed in claim 4, of the multi-cylinder type, characterised in that it has multi-point injection means, auxiliary passages linked respectively to the different cylinders, wherein each of these auxiliary passages is provided with an auxiliary control valve (10) which is curved towards the end which communicates with the corresponding admission pipe such that the flow of recycled burned gases is directed towards the admission valve, wherein the injection means are arranged essentially on a level with the said end of each auxiliary passage so that the fuel is injected directly into the flow of burned gases passing through each auxiliary passage.
EP92403040A 1991-11-18 1992-11-10 Method to improve the vaporization of fuel in an internal combustion engine and engine for implementing such method Expired - Lifetime EP0543704B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9114170A FR2683862B1 (en) 1991-11-18 1991-11-18 METHOD AND DEVICE FOR PROMOTING VAPORIZATION OF FUEL IN AN INTERNAL COMBUSTION ENGINE.
FR9114170 1991-11-18

Publications (2)

Publication Number Publication Date
EP0543704A1 EP0543704A1 (en) 1993-05-26
EP0543704B1 true EP0543704B1 (en) 1997-03-19

Family

ID=9419040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92403040A Expired - Lifetime EP0543704B1 (en) 1991-11-18 1992-11-10 Method to improve the vaporization of fuel in an internal combustion engine and engine for implementing such method

Country Status (5)

Country Link
US (1) US5351668A (en)
EP (1) EP0543704B1 (en)
JP (1) JPH05312108A (en)
DE (1) DE69218342T2 (en)
FR (1) FR2683862B1 (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2292975A (en) 1994-09-10 1996-03-13 Ford Motor Co I.c. engine cylinder head exhaust recirculation
FR2734869B1 (en) * 1995-06-02 1997-07-18 Renault ADDITIONAL GAS SUPPLY DEVICE FOR INTERNAL COMBUSTION ENGINE
DE19531875C1 (en) * 1995-08-30 1996-09-19 Daimler Benz Ag Cylinder head for liquid cooled multicylinder combustion engine
DE19621530C1 (en) * 1996-05-29 1997-06-05 Daimler Benz Ag Method of reducing harmful emissions from multicylinder combustion engines
US6079379A (en) * 1998-04-23 2000-06-27 Design & Manufacturing Solutions, Inc. Pneumatically controlled compressed air assisted fuel injection system
US6273037B1 (en) 1998-08-21 2001-08-14 Design & Manufacturing Solutions, Inc. Compressed air assisted fuel injection system
US6293235B1 (en) 1998-08-21 2001-09-25 Design & Manufacturing Solutions, Inc. Compressed air assisted fuel injection system with variable effective reflection length
US6102014A (en) * 1998-09-29 2000-08-15 Caterpillar Inc. Exhaust gas recirculation system
DE10009180C2 (en) * 2000-02-26 2002-04-25 Daimler Chrysler Ag Process for producing a homogeneous mixture for self-igniting internal combustion engines and for controlling the combustion process
BR0210121A (en) * 2001-06-01 2004-04-06 Vaporate Pty Ltd Fuel distribution system for an internal combustion engine
AUPR854501A0 (en) * 2001-10-30 2001-11-29 Casey, Alan Patrick Method and means for injecting fuel
KR100476195B1 (en) * 2001-12-18 2005-03-16 현대자동차주식회사 Exhaust gas recirculation system for internal combustion engine
US6868842B2 (en) * 2002-06-28 2005-03-22 Caterpillar Inc. Cylinder head of engine having recirculation chamber
US6769393B2 (en) * 2002-11-19 2004-08-03 Caterpillar Inc Valve system for internal combustion engine
US6758195B1 (en) * 2002-11-26 2004-07-06 Daimlerchrysler Corporation System and method for fast exhaust gas recirculation in a combustion chamber
DE102006036990A1 (en) * 2006-08-08 2008-02-14 Deutz Ag Combination of an internal and an external exhaust gas recirculation
KR100774328B1 (en) * 2006-08-10 2007-11-08 현대자동차주식회사 Exhaust-gas recirculation system
US7650866B2 (en) * 2006-11-17 2010-01-26 Gm Global Technology Operations, Inc. Light load air delivery system for an internal combustion engine
JP4811363B2 (en) * 2007-06-27 2011-11-09 トヨタ自動車株式会社 Control device for internal combustion engine
US7725159B2 (en) * 2007-09-21 2010-05-25 Hitach Medical Systems America, Inc. Horizontal field MRI shoulder coil
US7545144B2 (en) * 2007-11-14 2009-06-09 Hitachi Medical Systems America, Inc. Vertical field MRI shoulder coil
EP2065586A1 (en) * 2007-11-29 2009-06-03 Perkins Engines Company Limited Improved breathing for an internal combustion engine
NO344301B1 (en) * 2018-09-20 2019-10-28 Bergen Engines As A gas supply system for a gas engine

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416503A (en) * 1967-10-27 1968-12-17 Carl F. High Engine fume discharge reduction systems
US3498274A (en) * 1968-04-29 1970-03-03 Garrett Corp Fuel injector for internal combustion engines
DE2137030A1 (en) * 1971-07-23 1973-02-01 Werner Dipl Phys Kraus FUEL INJECTION DEVICE
JPS6052291B2 (en) * 1977-10-12 1985-11-18 トヨタ自動車株式会社 Internal combustion engine with multiple air intakes
JPS54141924A (en) * 1978-04-25 1979-11-05 Aisan Ind Co Ltd Exhaust gas recycling device
DE2936426A1 (en) * 1979-09-08 1981-04-02 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION VALVE
DE3011580A1 (en) * 1980-03-26 1981-10-01 Robert Bosch Gmbh, 7000 Stuttgart DEVICE FOR THE OPERATING MIXTURE SUPPLY OF INTERNAL COMBUSTION ENGINES
JPS57203859A (en) * 1981-06-09 1982-12-14 Nippon Denso Co Ltd Fuel atomization control device for internal-combustion engine
JPS61112773A (en) * 1984-11-07 1986-05-30 Mazda Motor Corp Engine with fuel injection device
DE3722048A1 (en) * 1987-07-03 1989-01-12 Bosch Gmbh Robert INTERNAL COMBUSTION ENGINE, ESPECIALLY OTTO ENGINE
DE4009923C2 (en) * 1990-03-28 1995-11-02 Fev Motorentech Gmbh & Co Kg Valve for metering the exhaust gas recirculation flow in internal combustion engines
DE69107242T2 (en) * 1990-06-01 1995-06-14 Mazda Motor Intake system for an engine.

Also Published As

Publication number Publication date
DE69218342D1 (en) 1997-04-24
JPH05312108A (en) 1993-11-22
FR2683862A1 (en) 1993-05-21
DE69218342T2 (en) 1997-06-26
EP0543704A1 (en) 1993-05-26
FR2683862B1 (en) 1995-05-24
US5351668A (en) 1994-10-04

Similar Documents

Publication Publication Date Title
EP0543704B1 (en) Method to improve the vaporization of fuel in an internal combustion engine and engine for implementing such method
US4732117A (en) Two-cycle internal combustion engine
US4732118A (en) Two-cycle internal combustion engine
US4732116A (en) Two-cycle internal combustion engine
EP1179676A1 (en) In-cylinder injection engine
FR2768180A1 (en) OPERATING PROCESS OF A 4-STROKE ENGINE, IN CONTROLLED SELF-IGNITION
FR2779476A1 (en) INTERNAL COMBUSTION ENGINE WITH VARIABLE TIMING OF THE CAMSHAFT AND MASKING OF THE INTAKE VALVE
BE904818A (en) IMPROVEMENTS IN ORDERING TRANSMISSIONS BY TWO-TIME ENGINES.
EP0249129B1 (en) Two-cycle internal combustion engine
FR2668541A1 (en) METHOD FOR REDUCING HARMFUL COMPONENTS IN EXHAUST GASES AND ENGINE THAT IMPLEMENTS IT.
EP0831217A3 (en) Multi-cylinder internal combustion engine
JPH108971A (en) Cylinder fuel injection engine
FR2777948A1 (en) CONTROLLED SELF-IGNITION COMBUSTION PROCESS AND 4-STROKE ENGINE ASSOCIATED WITH RESIDUAL GAS STORAGE VOLUME AND DEDICATED VALVE
FR2473631A1 (en) FOUR-STROKE INTERNAL COMBUSTION ENGINE
EP1489283B1 (en) Supercharged engine with indirect injection , EGR and process for supercharged air admission
US4060061A (en) Process and apparatus for improved I.C. engine composition
EP0296899B1 (en) Arrangement of a fuel feed system in a combustion chamber of a two-stroke engine in relation to the exhaust port
FR2893673A1 (en) Internal combustion engine e.g. spark ignition engine, has duct with channel emerging into pre-combustion chamber to supply fresh air, where chamber is delimited by wall having bend to generate whirling movement of fresh gas mixture
JPS54150515A (en) Intake device of fuel injection system spark ignition engine
FR2893672A1 (en) INTERNAL COMBUSTION ENGINE WITH STRATIFICATION OF INTAKE GASES
EP0484226A1 (en) Two-stroke engine
US4781154A (en) Two-cycle internal combustion engine
FR2853354A1 (en) INTERNAL COMBUSTION ENGINE WITH DIRECT FUEL INJECTION AND CONTROLLED IGNITION
FR2717227A1 (en) Method of fuel injection for motor vehicle IC engine with controlled ignition and direct injection
EP0907827B1 (en) System for directly injecting fuel into a cylinder combustion chamber of an internal combustion engine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19921125

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE GB IT NL SE

17Q First examination report despatched

Effective date: 19940127

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed

Owner name: DE DOMINICIS & MAYER S.R.L.

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE GB IT NL SE

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19970319

REF Corresponds to:

Ref document number: 69218342

Country of ref document: DE

Date of ref document: 19970424

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971130

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
BERE Be: lapsed

Owner name: INSTITUT FRANCAIS DU PETROLE

Effective date: 19971130

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20011022

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20011130

Year of fee payment: 10

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20020927

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021110

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20021128

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030601

GBPC Gb: european patent ceased through non-payment of renewal fee
NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20030601

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031111

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040602

EUG Se: european patent has lapsed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051110