EP0278191A1 - Apparatus and method for the rapid excitation of an oxidation catalyst for a two-stroke engine - Google Patents

Apparatus and method for the rapid excitation of an oxidation catalyst for a two-stroke engine Download PDF

Info

Publication number
EP0278191A1
EP0278191A1 EP87402904A EP87402904A EP0278191A1 EP 0278191 A1 EP0278191 A1 EP 0278191A1 EP 87402904 A EP87402904 A EP 87402904A EP 87402904 A EP87402904 A EP 87402904A EP 0278191 A1 EP0278191 A1 EP 0278191A1
Authority
EP
European Patent Office
Prior art keywords
catalyst
pipe
exhaust
cylinder
upstream
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
EP87402904A
Other languages
German (de)
French (fr)
Other versions
EP0278191B1 (en
Inventor
Pierre Duret
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
IFP Energies Nouvelles IFPEN
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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 Automobiles Peugeot SA, Automobiles Citroen SA, IFP Energies Nouvelles IFPEN filed Critical Automobiles Peugeot SA
Priority to AT87402904T priority Critical patent/ATE72298T1/en
Publication of EP0278191A1 publication Critical patent/EP0278191A1/en
Application granted granted Critical
Publication of EP0278191B1 publication Critical patent/EP0278191B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/06—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device at cold starting

Definitions

  • the present invention relates to a device and a method for rapidly initiating an oxidation catalyst for a two-stroke engine comprising at least one cylinder.
  • the device according to the invention uses a separation, in the axial direction of the cylinder, of the light (s) and exhaust duct, to select two exhaust gas outlets which at least during certain periods or phases of operation of the engine are of different composition and / or temperature.
  • the outlet with the highest temperature can be permanently connected to the oxidation catalyst.
  • the other outlet, the gas temperature of which is lower, can be either connected directly to the catalyst, or connected to the exhaust pipe downstream of the catalyst, depending respectively on whether the catalyst is primed or not.
  • primed catalyst is meant that the catalyst has reached a temperature high enough to be sufficiently active.
  • the present invention relates to a two-stroke engine comprising at least a cylinder head, a cylinder and a catalytic converter, said pot comprising a catalyst for the treatment of exhaust gases, said cylinder comprising at least two exhaust openings or lights offset relative to each other in the axial direction of said cylinder.
  • the device comprises in combination: a first pipe connecting that of said lights which is closest to the cylinder head, or first light at a point upstream of said catalyst, a second pipe connecting the other light upstream of said catalyst, a bypass line connecting a point of said second line to a point downstream of said catalyst and a distribution member positioned at the junction of the bypass line with the second line, said distribution member being adapted to distribute the gas from of said second lumen upstream and downstream of said catalyst.
  • the motor according to the invention may include means for controlling said distribution member.
  • control means can be controlled by means for detecting the temperature level of said catalyst.
  • first and second exhaust pipes includes means for restricting its passage section.
  • first pipe comprises periodic shutter means subject to the speed of rotation of the engine. These means may include a rotating plug.
  • the invention also relates to a method for rapidly priming a catalyst contained in a catalytic converter of a two-stroke engine, according to which the hottest fraction of the exhaust gases is transferred upstream of said catalyst and it is transferred downstream of said catalyst the remaining fraction of the exhaust gases and this until said catalyst is not primed.
  • the ignition of the catalyst can be determined by detecting a quantity linked to the temperature of said catalyst.
  • Figure 1 is a schematic representation of a two-stroke engine cylinder with positive ignition equipped with an oxidation catalytic converter and the device according to the invention.
  • the reference 1 designates the cylinder closed at its upper part by the cylinder head 2. In the cylinder moves the piston 3.
  • the reference 31 designates the spark plug of the cylinder 1.
  • This cylinder has two exhaust ports 4 and 5 located at different dimensions considering the axis of the cylinder.
  • Reference 16 designates a catalytic converter containing a catalyst 9.
  • the reference 7 designates a first exhaust pipe or pipe connecting the first exhaust light 4 with an inlet 17 of the catalytic converter upstream of the catalyst 9.
  • the reference 8 designates a second exhaust pipe or pipe connecting the second exhaust port 5 to an inlet 18 of the catalytic converter upstream of the catalyst 9. It will not depart from the scope of the present invention if the first and the second pipes exhaust join before opening into the catalytic converter 16 as shown in dotted lines in FIG. 2.
  • the reference 10 designates a diversion pipe or pipe, one of the ends of which is connected to the second exhaust pipe 8 forming a nozzle.
  • the other end of the pipe 10 can be connected downstream of the catalyst 9 as shown in FIG. 1.
  • the bypass tubing is connected at 19 to a tubing 13 coming from the catalytic converter 16 downstream from the catalyst . In any case, this other end of the pipe does not connect upstream of the catalyst 9.
  • the bypass manifold divides the second exhaust manifold 8 into two portions, one 20 between the second exhaust lumen 5 and the location 21 of connection of the bypass manifold 10, the other 11 being between this connection location 21 and the inlet 18 of the catalytic converter.
  • the reference 12 designates a member for distributing the gases coming from the second exhaust port 5, this distribution being effected by means of the first portion 20 of the second exhaust manifold 8.
  • this member is a flap 12. This flap makes it possible either to pass the exhaust gas coming from the portion of tubing 20 into the catalyst, or not to pass it there, it is the portion 11 of the second exhaust pipe 8 which allows these exhaust gases to pass through the catalyst 9.
  • the flap 12 is articulated on an axis 22, and is integral with a control rod 23 which can be placed in its extension.
  • This rod 23 is connected to an arm 24 articulated around an axis 25 by an intermediate articulation part 26.
  • the articulated arm 24 is controlled by means of a detector 27 making it possible to determine whether the catalyst is primed or not.
  • this detector is a temperature detector.
  • This temperature detector can be of any known type, in particular, bimetallic strip, wax reserve, or electronic, etc.
  • the detector comprises a temperature sensor, the signal of which is transmitted to a control unit 29 which acts directly on the rod 23 for controlling the shutter 12.
  • the displacement of the piston 3 allows communication between the cylinder 1 and the exhaust pipes 7 and 8 through, respectively, the two stages 4 and 5 of the exhaust light (s), separated by a partition 6 .
  • the first tube is directly connected to an oxidation catalytic converter 9.
  • the second tube 8 is divided into two parts 10 and 11 which can be alternately closed depending on the position of the flap 12.
  • the first portion 20 of the tube 8 can therefore be either directly connected to the pipe 13 downstream of the catalyst 9 through the bypass pipe 10, or less directly through the second portion 11 of the exhaust pipe 8 and the oxidation catalyst 9, depending on the position that occupies section 12.
  • the catalyst is not primed, because when cold the flap 12 closes the second portion 11 of the second pipe or exhaust pipe 8.
  • the partition or partition 6 may not be in contact with the piston 3 and only approach it as closely as possible to minimize leaks when it is masked by the piston.
  • Such an assembly makes it possible to equip already existing engines with the improvement according to the present invention by obtaining two slots 4 and 5 offset in the direction defined by the axis of the cylinder.
  • the level of this separation 6 may preferably be chosen at the level of the transfer opening 14, for example.
  • the tubing 7 is therefore supplied with very hot burnt gases, while the tubing 20 is not supplied.
  • the content of the cylinder 1 is swept by the fresh gases coming from the casing 15 through the port 14.
  • the present invention is applicable even if the fresh gases come partially or totally from a valve, whether or not the engine is of the pump housing type.
  • the tube 7 continues to be supplied essentially with burnt gases, which also supply, but to a much lesser extent, the second tube 8, the lumen 5 of which was opened much later.
  • the exhaust ports being wide open, part of the fresh gases also escapes into the pipes 7 and 8.
  • the absence of catalyst in the circuit formed by the first portion 20 of the pipe 8 and the bypass pipe 10 can make it more permeable, which is rather favorable for the rapid temperature rise of the catalyst.
  • the ascent of the piston 3 When the ascent of the piston 3 occurs, it first closes the second exhaust light, or lower light 5, then the first exhaust light 4, or upper light.
  • the terms upper and lower are to be considered assuming the cylinder head 2 as the top of the engine and the casing 15 as the bottom of the engine.
  • the "short-circuiting" of the fuel at the exhaust occurs shortly before the closing of the exhaust orifices.
  • the fuel “short-circuited” will therefore preferably feed the pipe 7.
  • short-circuiting or “short-circuited”, it is meant that part of the fuel passes directly to the exhaust, without having participated to combustion in the cylinder and this before it has taken place.
  • the burnt and fresh gas compositions of the pipes 7 and 8 will therefore be different thanks to the device according to the invention.
  • the tube 7 may proportionally contain much more burnt gas and less fresh gas (with possibly more fuel "short-circuited") than the tube 8.
  • the overall temperature of the gases in the pipe 7 will therefore be significantly higher than that of those in the pipe 8.
  • the position of the flap 12 is changed, for this time, bringing the first portion 20 of the second exhaust pipe 8 into communication. , this will, among other things, transport a fraction of fresh gas and oxygen which are necessary for complete conversion of the pollutants, into the catalyst 9.
  • the flap 12 is controlled by means of temperature detectors 27 and all of the displacement means 24, 26 and 23.
  • the displacement of the flap 12 is achieved by control means 29 connected to a temperature detector 28.
  • the exhaust pipe 7 may comprise a periodic shutter member, such as a rotary plug 30, driven in rotation at a speed equal to or multiple of the speed of rotation of the engine.
  • This bushel is dimensioned and wedged so that the pipe 7 is only opened for a period corresponding to the presence of hot gas in the cylinder.
  • the distribution flap 12 gradually occupies intermediate positions as the temperature of the catalyst changes.
  • the engine comprises several cylinders with one or more catalytic converters.
  • one or more cylinders can be fitted to the device according to the present invention.
  • the number of cylinders equipped with the device according to the invention can be determined as a function of the desired catalyst priming time.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)

Abstract

A device and method are provided for rapidly priming a catalyst contained in a catalytic pot for a two stroke engine wherein the hottest fraction of the exhaust gases is transferred upstream of said catalyst and the remaining fraction of the exhaust gases is transferred downstream of said catalyst, as long as said catalyst is not primed.

Description

La présente invention concerne un dispositif et un procédé pour amorcer rapidement un catalyseur d'oxydation pour un moteur deux temps comportant au moins un cylindre.The present invention relates to a device and a method for rapidly initiating an oxidation catalyst for a two-stroke engine comprising at least one cylinder.

Le dispositif suivant l'invention utilise une séparation, dans la direction axiale du cylindre, de la (ou des) lumière et conduit d'échappement, pour sélectionner deux sorties de gaz d'échappement qui au moins pendant certaines périodes ou phases de fonctionnement du moteur sont de composition et/ou température différentes.The device according to the invention uses a separation, in the axial direction of the cylinder, of the light (s) and exhaust duct, to select two exhaust gas outlets which at least during certain periods or phases of operation of the engine are of different composition and / or temperature.

La sortie dont la température est la plus élevée peut être reliée en permanence au catalyseur d'oxydation. L'autre sortie, dont la température des gaz est inférieure, peut être, soit reliée directement au catalyseur, soit reliée à la tubulure d'échappement en aval du catalyseur, suivant respectivement que le catalyseur est amorcé ou non. Par catalyseur amorcé, on entend que le catalyseur a atteint une température assez élevée pour être suffisamment actif.The outlet with the highest temperature can be permanently connected to the oxidation catalyst. The other outlet, the gas temperature of which is lower, can be either connected directly to the catalyst, or connected to the exhaust pipe downstream of the catalyst, depending respectively on whether the catalyst is primed or not. By primed catalyst is meant that the catalyst has reached a temperature high enough to be sufficiently active.

Ainsi, la présente invention concerne un moteur à deux temps comportant au moins une culasse, un cylindre et un pot catalytique, ledit pot comportant un catalyseur pour le traitement de gaz d'échappement, ledit cylindre comportant au moins deux ouvertures ou lumières d'échappement décalées l'une par rapport à l'autre suivant la direction axiale dudit cylindre.Thus, the present invention relates to a two-stroke engine comprising at least a cylinder head, a cylinder and a catalytic converter, said pot comprising a catalyst for the treatment of exhaust gases, said cylinder comprising at least two exhaust openings or lights offset relative to each other in the axial direction of said cylinder.

Le dispositif selon l'invention comporte en combinaison : une première canalisation reliant celle desdites lumières qui est la plus proche de la culasse, ou première lumière à un point en amont dudit catalyseur, une deuxième canalisation reliant l'autre lumière à l'amont dudit catalyseur, une canalisation de dérivation reliant un point de ladite deuxième canalisation à un point en aval dudit catalyseur et un organe de distribution positionné à la jonction de la canalisation de dérivation avec la deuxième canalisation, ledit organe de distribution étant adapté à distribuer le gaz provenant de ladite deuxième lumière en amont et en aval dudit catalyseur.The device according to the invention comprises in combination: a first pipe connecting that of said lights which is closest to the cylinder head, or first light at a point upstream of said catalyst, a second pipe connecting the other light upstream of said catalyst, a bypass line connecting a point of said second line to a point downstream of said catalyst and a distribution member positioned at the junction of the bypass line with the second line, said distribution member being adapted to distribute the gas from of said second lumen upstream and downstream of said catalyst.

Le moteur selon l'invention pourra comporter des moyens de commande dudit organe de distribution.The motor according to the invention may include means for controlling said distribution member.

Selon la présente invention, les moyens de commande pourront être pilotés par des moyens de détection du niveau de température dudit catalyseur.According to the present invention, the control means can be controlled by means for detecting the temperature level of said catalyst.

On ne sortira pas du cadre de la présente invention si l'une au moins desdites première et deuxième canalisations d'échappement comporte des moyens de restriction de sa section de passage. De même, on ne sortira pas du cadre de la présente invention si la première canalisation comporte des moyens d'obturation périodique asservis à la vitesse de rotation du moteur. Ces moyens pourront comporter un boisseau tournant.It will not depart from the scope of the present invention if at least one of said first and second exhaust pipes includes means for restricting its passage section. Likewise, it will not depart from the scope of the present invention if the first pipe comprises periodic shutter means subject to the speed of rotation of the engine. These means may include a rotating plug.

L'invention concerne également un procédé d'amorcage rapide d'un catalyseur contenu dans un pot catalytique d'un moteur deux temps, selon laquelle on transfère la fraction la plus chaude des gaz d'échappement en amont dudit catalyseur et on transfère en aval dudit catalyseur la fraction restante des gaz d'échappement et cela tant que ledit catalyseur n'est pas amorcé.The invention also relates to a method for rapidly priming a catalyst contained in a catalytic converter of a two-stroke engine, according to which the hottest fraction of the exhaust gases is transferred upstream of said catalyst and it is transferred downstream of said catalyst the remaining fraction of the exhaust gases and this until said catalyst is not primed.

L'armorçage du catalyseur pourra être déterminé en détectant une grandeur liée à la température dudit catalyseur.The ignition of the catalyst can be determined by detecting a quantity linked to the temperature of said catalyst.

Les avantages et les caractéristiques de l'invention seront mis en évidence dans la suite de la description, donnée à titre d'exemple non limitatif, en se référant aux figures annexées parmi lesquelles :

  • - la figure 1 montre schématiquement et en coupe un moteur deux temps équipé d'un pot catalytique d'oxydation et du dispositif suivant l'invention,
  • - les figures 2 et 3 illustrent le fonctionnement du moteur et du dispositif suivant l'invention.
The advantages and characteristics of the invention will be highlighted in the following description, given by way of nonlimiting example, with reference to the appended figures among which:
  • FIG. 1 shows diagrammatically and in section a two-stroke engine equipped with an oxidation catalytic converter and the device according to the invention,
  • - Figures 2 and 3 illustrate the operation of the engine and the device according to the invention.

La figure 1 est une représentation schématique d'un cylindre de moteur deux temps à allumage commandé équipé d'un pot catalytique d'oxydation et du dispositif suivant l'invention.Figure 1 is a schematic representation of a two-stroke engine cylinder with positive ignition equipped with an oxidation catalytic converter and the device according to the invention.

La référence 1 désigne le cylindre fermé à sa partie supérieure par la culasse 2. Dans le cylindre se déplace le piston 3. La référence 31 désigne la bougie d'allumage du cylindre 1.The reference 1 designates the cylinder closed at its upper part by the cylinder head 2. In the cylinder moves the piston 3. The reference 31 designates the spark plug of the cylinder 1.

Ce cylindre comporte deux lumières d'échappement 4 et 5 situées à des cotes différentes en considérant l'axe du cylindre.This cylinder has two exhaust ports 4 and 5 located at different dimensions considering the axis of the cylinder.

Ainsi, l'une de ces lumières, qui sera qualifiée de première lumière d'échappement 4, sera plus proche de la culasse 2 que l'autre, qui sera qualifiée de deuxième lumière d'échappement 5. Sur la figure 1, ces deux lumières sont séparées par une cloison 6.Thus, one of these lights, which will be qualified as the first exhaust light 4, will be closer to the cylinder head 2 than the other, which will be qualified as the second exhaust light 5. In FIG. 1, these two lights are separated by a partition 6.

La référence 16 désigne un pot catalytique contenant un catalyseur 9.Reference 16 designates a catalytic converter containing a catalyst 9.

La référence 7 désigne une première tubulure ou canalisation d'échap­pement mettant en communication la première lumière d'échappement 4 avec une entrée 17 du pot catalytique en amont du catalyseur 9.The reference 7 designates a first exhaust pipe or pipe connecting the first exhaust light 4 with an inlet 17 of the catalytic converter upstream of the catalyst 9.

La référence 8 désigne une deuxième tubulure ou canalisation d'échappement reliant la deuxième lumière d'échappement 5 à une entrée 18 du pot catalytique en amont du catalyseur 9. On ne sortira pas du cadre de la présente invention si la première et la deuxième tubulures d'échappement se rejoignent avant de déboucher dans le pot catalytique 16 comme cela est représenté en pointillé sur la figure 2.The reference 8 designates a second exhaust pipe or pipe connecting the second exhaust port 5 to an inlet 18 of the catalytic converter upstream of the catalyst 9. It will not depart from the scope of the present invention if the first and the second pipes exhaust join before opening into the catalytic converter 16 as shown in dotted lines in FIG. 2.

La référence 10 désigne une tubulure ou canalisation de dérivation dont l'une des extrémités se raccorde sur la deuxième tubulure d'échappement 8 formant un piquage. L'autre extrémité de la canali­sation 10 peut se raccorder en aval du catalyseur 9 comme cela est représenté à la figure 1. Sur cette figure, la tubulure de dérivation se raccorde en 19 sur une tubulure 13 provenant du pot catalytique 16 en aval du catalyseur. En tous cas, cette autre extrémité de la canalisation ne se raccorde pas en amont du catalyseur 9.The reference 10 designates a diversion pipe or pipe, one of the ends of which is connected to the second exhaust pipe 8 forming a nozzle. The other end of the pipe 10 can be connected downstream of the catalyst 9 as shown in FIG. 1. In this figure, the bypass tubing is connected at 19 to a tubing 13 coming from the catalytic converter 16 downstream from the catalyst . In any case, this other end of the pipe does not connect upstream of the catalyst 9.

La tubulure de dérivation partage la deuxième tubulure d'échappement 8 en deux portions, l'une 20 comprise entre la deuxième lumière d'échappement 5 et l'endroit 21 de raccordement de la tubulure de dérivation 10, l'autre 11 étant comprise entre cet endroit de raccordement 21 et l'entrée 18 du pot catalytique.The bypass manifold divides the second exhaust manifold 8 into two portions, one 20 between the second exhaust lumen 5 and the location 21 of connection of the bypass manifold 10, the other 11 being between this connection location 21 and the inlet 18 of the catalytic converter.

La référence 12 désigne un organe de répartition des gaz provenant de la deuxième lumière d'échappement 5, cette répartition s'effectuant par l'intermédiaire de la première portion 20 de la deuxième tubulure d'échappement 8. Dans le cas de la figure 1, cet organe est un volet 12. Ce volet permet, soit de faire passer le gaz d'échappement provenant de la portion de tubulure 20 dans le catalyseur, soit de ne pas l'y faire passer, c'est la portion 11 de la deuxième canalisation d'échappement 8 qui permet de faire passer ces gaz d'échappement dans le catalyseur 9.The reference 12 designates a member for distributing the gases coming from the second exhaust port 5, this distribution being effected by means of the first portion 20 of the second exhaust manifold 8. In the case of FIG. 1 , this member is a flap 12. This flap makes it possible either to pass the exhaust gas coming from the portion of tubing 20 into the catalyst, or not to pass it there, it is the portion 11 of the second exhaust pipe 8 which allows these exhaust gases to pass through the catalyst 9.

Sur la figure 1, le volet 12 est articulé sur un axe 22, et est solidaire d'une tige de commande 23 qui peut être placée dans son prolongement. Cette tige 23 est reliée à un bras 24 articulé autour d'un axe 25 par une pièce intermédiaire d'articulation 26.In Figure 1, the flap 12 is articulated on an axis 22, and is integral with a control rod 23 which can be placed in its extension. This rod 23 is connected to an arm 24 articulated around an axis 25 by an intermediate articulation part 26.

Le bras articulé 24 est commandé par l'intermédiaire d'un détecteur 27 permettant de déterminer si le catalyseur est amorcé ou non. Selon un mode préféré de réalisation de l'invention, ce détecteur est un détecteur de température.The articulated arm 24 is controlled by means of a detector 27 making it possible to determine whether the catalyst is primed or not. According to a preferred embodiment of the invention, this detector is a temperature detector.

Ce détecteur de température peut être de tout type connu, notamment, à bilame, à réserve de cire, ou électronique etc.This temperature detector can be of any known type, in particular, bimetallic strip, wax reserve, or electronic, etc.

Dans le cas des figures 2 et 3, le détecteur comporte un capteur de température dont le signal est transmis à un boitier de commande 29 qui agit directement sur la tige 23 de commande du volet 12.In the case of FIGS. 2 and 3, the detector comprises a temperature sensor, the signal of which is transmitted to a control unit 29 which acts directly on the rod 23 for controlling the shutter 12.

Le déplacement du piston 3 permet une mise en communication entre le cylindre 1 et les tubulures d'échappement 7 et 8 à travers, respectivement, les deux étages 4 et 5 de la (ou des) lumière d'échappement, séparés par une cloison 6.The displacement of the piston 3 allows communication between the cylinder 1 and the exhaust pipes 7 and 8 through, respectively, the two stages 4 and 5 of the exhaust light (s), separated by a partition 6 .

Ainsi, la première tubulure est directement reliée à un pot catalytique d'oxydation 9. La deuxième tubulure 8 se divise en deux parties 10 et 11 pouvant être alternativement obturées suivant la position du volet 12. La première portion 20 de la tubulure 8 peut donc être, soit directement reliée à la tubulure 13 en aval du catalyseur 9 à travers la tubulure de dérivation 10, soit moins directement à travers la deuxième portion 11 de la tubulure d'échappement 8 et le catalyseur d'oxydation 9, suivant la position qu'occupe le volet 12.Thus, the first tube is directly connected to an oxidation catalytic converter 9. The second tube 8 is divided into two parts 10 and 11 which can be alternately closed depending on the position of the flap 12. The first portion 20 of the tube 8 can therefore be either directly connected to the pipe 13 downstream of the catalyst 9 through the bypass pipe 10, or less directly through the second portion 11 of the exhaust pipe 8 and the oxidation catalyst 9, depending on the position that occupies section 12.

Le fonctionnement du moteur équipé du dispositif de la figure 1 est décrit ci-après en se référant aux figures 2 et 3.The operation of the engine equipped with the device of FIG. 1 is described below with reference to FIGS. 2 and 3.

Au départ, le catalyseur n'est pas amorcé, parce qu'à froid le volet 12 obture la deuxième portion 11 de la deuxième tubulure ou conduite d'échappement 8.At the start, the catalyst is not primed, because when cold the flap 12 closes the second portion 11 of the second pipe or exhaust pipe 8.

Dans la suite de la description on considèrera un cycle complet de fonctionnement d'un cylindre du moteur en se référant à la course du piston 3. Sur la figure 2, le piston 3, qui est dans la phase de détente, découvre la première lumière d'échappement 4, laissant échapper les gaz brûlés, auparavant enfermés sous pression dans le cylindre, dans la tubulure d'échappement 7.In the following description, a full operating cycle of an engine cylinder will be considered with reference to the stroke of the piston 3. In FIG. 2, the piston 3, which is in the expansion phase, discovers the first light exhaust 4, letting escape the burnt gases, previously locked under pressure in the cylinder, in the exhaust manifold 7.

La cloison ou séparation 6 peut ne pas être en contact avec le piston 3 et seulement s'en approcher au plus près pour minimiser les fuites lorsqu'elle est masquée par le piston. Un tel montage permet d'équiper des moteurs déjà existants du perfectionnement selon la présente invention par l'obtention de deux lumières 4 et 5 décalées selon la direction définie par l'axe du cylindre.The partition or partition 6 may not be in contact with the piston 3 and only approach it as closely as possible to minimize leaks when it is masked by the piston. Such an assembly makes it possible to equip already existing engines with the improvement according to the present invention by obtaining two slots 4 and 5 offset in the direction defined by the axis of the cylinder.

Le niveau de cette séparation 6 pourra être préférentiellement choisi au niveau de l'ouverture de transfert 14, par exemple. La tubulure 7 est donc alimentée en gaz brûlés très chauds, tandis que la tubulure 20 n'est pas alimentée.The level of this separation 6 may preferably be chosen at the level of the transfer opening 14, for example. The tubing 7 is therefore supplied with very hot burnt gases, while the tubing 20 is not supplied.

Sur la figure 3, tous les orifices du cylindre sont ouverts, les deux lumières d'échappement 4 et 5, ainsi que la lumière 14 d'admission, qui peut être une lumière de transfert 14 reliée au carter 15 du moteur.In FIG. 3, all the orifices of the cylinder are open, the two exhaust ports 4 and 5, as well as the intake port 14, which can be a transfer port 14 connected to the casing 15 of the engine.

Dans ce cas, le contenu du cylindre 1 est balayé par les gaz frais venant du carter 15 à travers la lumière 14. La présente invention est applicable même si les gaz frais proviennent partiellement ou totalement d'une soupape, que le moteur soit ou non du type à carter-­pompe.In this case, the content of the cylinder 1 is swept by the fresh gases coming from the casing 15 through the port 14. The present invention is applicable even if the fresh gases come partially or totally from a valve, whether or not the engine is of the pump housing type.

La tubulure 7 continue à être alimentée essentiellement en gaz brûlés, lesquels alimentent également, mais dans une bien moindre mesure, la deuxième tubulure 8 dont la lumière 5 a été ouverte beaucoup plus tardivement.The tube 7 continues to be supplied essentially with burnt gases, which also supply, but to a much lesser extent, the second tube 8, the lumen 5 of which was opened much later.

Les lumières d'échappement étant grandes ouvertes, une partie des gaz frais s'échappe aussi dans les tubulures 7 et 8. L'absence de catalyseur dans le circuit formé par la première portion 20 de la tubulure 8 et la tubulure de dérivation 10 peut le rendre plus perméable, ce qui est plutôt favorable pour la mise en température rapide du catalyseur.The exhaust ports being wide open, part of the fresh gases also escapes into the pipes 7 and 8. The absence of catalyst in the circuit formed by the first portion 20 of the pipe 8 and the bypass pipe 10 can make it more permeable, which is rather favorable for the rapid temperature rise of the catalyst.

On pourra de même favoriser la circulation dans l'une ou l'autre des deux tubulures d'échappement 7 et 8, en leur attribuant des pertes de charge différentes par divers moyens, tels au moins une restriction, un papillon, ou des diamètres de tubulure différents, etc.We can similarly promote circulation in one or the other of the two exhaust pipes 7 and 8, by assigning them different pressure drops by various means, such as at least one restriction, a butterfly valve, or diameters of different tubing, etc.

Lorsque la remontée du piston 3 se produit, celui-ci obture d'abord la deuxième lumière d'échappement, ou lumière inférieure 5, puis la première lumière d'échappement 4, ou lumière supérieure. Les termes de supérieure et d'inférieure sont à considérer en supposant la culasse 2 comme étant le haut du moteur et le carter 15 comme le bas du moteur.When the ascent of the piston 3 occurs, it first closes the second exhaust light, or lower light 5, then the first exhaust light 4, or upper light. The terms upper and lower are to be considered assuming the cylinder head 2 as the top of the engine and the casing 15 as the bottom of the engine.

Dans les moteurs 2 temps à introduction plus ou moins retardée du carburant par rapport à l'air, le "court-circuitage" du carburant à l'échappement se produit peu avant la fermeture des orifices d'échappement. Ainsi dans ce cas, le carburant "court-circuité" alimentera donc préférentiellement la tubulure 7. Par "court-­circuitage" ou "court-circuité", on entend qu'une partie du carburant passe directement à l'échappement, sans avoir participé à la combustion dans le cylindre et cela avant que celle-ci n'ait eu lieu.In 2-stroke engines with more or less delayed introduction of the fuel relative to the air, the "short-circuiting" of the fuel at the exhaust occurs shortly before the closing of the exhaust orifices. Thus in this case, the fuel “short-circuited” will therefore preferably feed the pipe 7. By “short-circuiting” or “short-circuited”, it is meant that part of the fuel passes directly to the exhaust, without having participated to combustion in the cylinder and this before it has taken place.

Au moment de la fermeture d'échappement et avant le début d'un nouveau cycle de balayage, les compositions en gaz brûlés et frais des tubulures 7 et 8 seront donc différentes grâce au dispositif selon l'invention. En effet, la tubulure 7 pourra contenir proportion­nellement beaucoup plus de gaz brûlés et moins de gaz frais (avec éventuellement plus de carburant "court-circuité") que la tubulure 8.At the time of exhaust shutdown and before the start of a new sweep cycle, the burnt and fresh gas compositions of the pipes 7 and 8 will therefore be different thanks to the device according to the invention. In fact, the tube 7 may proportionally contain much more burnt gas and less fresh gas (with possibly more fuel "short-circuited") than the tube 8.

La température globale des gaz dans la tubulure 7 sera donc nettement supérieure à celle de ceux de la tubulure 8.The overall temperature of the gases in the pipe 7 will therefore be significantly higher than that of those in the pipe 8.

Cette température plus élevée sera utilisée pour permettre l'amorçage rapide du catalyseur 9.This higher temperature will be used to allow rapid initiation of catalyst 9.

Ensuite, lorsque la température du catalyseur 9 atteint un niveau suffisant pour une conversion correcte des polluants émis par le cylindre, la position du volet 12 est changée, pour cette fois, mettre en communication la première portion 20 de la deuxième tubulure d'échappement 8, celle-ci acheminera entre autre une fraction de gaz frais et d'oxygène qui sont nécessaires à une conversion complète des polluants, dans le catalyseur 9.Then, when the temperature of the catalyst 9 reaches a level sufficient for a correct conversion of the pollutants emitted by the cylinder, the position of the flap 12 is changed, for this time, bringing the first portion 20 of the second exhaust pipe 8 into communication. , this will, among other things, transport a fraction of fresh gas and oxygen which are necessary for complete conversion of the pollutants, into the catalyst 9.

Sur la figure 1, le volet 12 est commandé par l'intermédiaire de détecteurs de température 27 et de l'ensemble des moyens de déplacement 24, 26 et 23. Dans les figures 2 et 3, le déplacement du volet 12 est réalisé par des moyens de commande 29 reliés à un détecteur de température 28.In FIG. 1, the flap 12 is controlled by means of temperature detectors 27 and all of the displacement means 24, 26 and 23. In FIGS. 2 and 3, the displacement of the flap 12 is achieved by control means 29 connected to a temperature detector 28.

Dans l'exemple précédent, la première tubulure d'échappement reliait directement la première lumière d'échappement 4 au pot 16.In the previous example, the first exhaust pipe directly connected the first exhaust light 4 to the pot 16.

Selon un mode particulier de réalisation, la tubulure d'échappement 7 pourra comporter un organe d'obturation périodique, tel un boisseau tournant 30, entrainé en rotation à une vitesse égale ou multiple de la vitesse de rotation du moteur. Ce boisseau est dimensionné et calé pour que la canalisation 7 ne soit ouverte que pendant une période correspondant à la présence de gaz chaud dans le cylindre.According to a particular embodiment, the exhaust pipe 7 may comprise a periodic shutter member, such as a rotary plug 30, driven in rotation at a speed equal to or multiple of the speed of rotation of the engine. This bushel is dimensioned and wedged so that the pipe 7 is only opened for a period corresponding to the presence of hot gas in the cylinder.

Ainsi, à titre d'exemple, il est possible de caler ce boisseau pour que la première tubulure d'échappement soit ouverte lorsque le piston 3 découvre la première lumière 4 et tant que la lumière d'admission 14 n'est pas ouverte. Ainsi, il est certain que les gaz frais et froids ne passeront pas par le catalyseur.Thus, by way of example, it is possible to wedge this plug so that the first exhaust manifold is open when the piston 3 discovers the first lumen 4 and as long as the intake lumen 14 is not open. Thus, it is certain that the cool and cold gases will not pass through the catalyst.

On ne sortira pas du cadre de la présente invention en remplaçant le détecteur de température 27 ou 28 par d'autres moyens permettant de déterminer si le catalyseur est amorcé ou non.It will not depart from the scope of the present invention to replace the temperature detector 27 or 28 by other means making it possible to determine whether the catalyst is primed or not.

De plus, il est possible selon la présente invention que le volet de répartition 12 occupe progressivement des positions intermédiaires au fur et à mesure que la température du catalyseur évolue.In addition, it is possible according to the present invention that the distribution flap 12 gradually occupies intermediate positions as the temperature of the catalyst changes.

Il est bien évident que l'on ne sortira pas du cadre de la présente invention si le moteur comporte plusieurs cylindres avec un ou plusieurs pots catalytiques. Dans ce cas, on pourra équiper un ou plusieurs cylindres du dispositif selon la présente invention. Le nombre de cylindres équipés du dispositif selon l'invention pourra être déterminé en fonction du délai souhaité d'amorçage du catalyseur.It is obvious that it will not depart from the scope of the present invention if the engine comprises several cylinders with one or more catalytic converters. In this case, one or more cylinders can be fitted to the device according to the present invention. The number of cylinders equipped with the device according to the invention can be determined as a function of the desired catalyst priming time.

Claims (8)

1. - Moteur à deux temps comportant au moins une culasse, un cylindre et un pot catalytique, ledit pot comportant un catalyseur pour le traitement de gaz d'échappement, ledit cylindre comportant au moins deux ouvertures ou lumières d'échappement décalées l'une par rapport à l'autre suivant la direction axiale dudit cylindre, caractérisé en ce qu'il comporte en combinaison : une première canalisation (7) reliant celle desdites lumières qui est la plus proche de la culasse, ou première lumière (4), à un point en amont dudit catalyseur (9), une deuxième canalisation (8) reliant l'autre lumière (5) à l'amont dudit catalyseur (9), une canalisation de dérivation (10) reliant un point de ladite deuxième canalisation (8) à un point en aval dudit catalyseur et un organe de distribution (12) positionné à la jonction de la canalisation de dérivation (10) avec la deuxième canalisation (8), ledit organe de distribution (12) étant adapté à distribuer le gaz provenant de ladite deuxième lumière (5) en amont et en aval dudit catalyseur.1. - Two-stroke engine comprising at least a cylinder head, a cylinder and a catalytic converter, said pot comprising a catalyst for the treatment of exhaust gases, said cylinder comprising at least two openings or exhaust lights offset one relative to the other in the axial direction of said cylinder, characterized in that it comprises in combination: a first pipe (7) connecting that of said lights which is closest to the cylinder head, or first light (4), a point upstream of said catalyst (9), a second pipe (8) connecting the other lumen (5) upstream of said catalyst (9), a bypass pipe (10) connecting a point of said second pipe (8 ) at a point downstream of said catalyst and a distribution member (12) positioned at the junction of the bypass pipe (10) with the second pipe (8), said distribution member (12) being adapted to distribute the gas coming from of said second light (5) e n upstream and downstream of said catalyst. 2. - Moteur selon la revendication 1, caractérisé en ce qu'il comporte des moyens de commande (29) dudit organe de distribution (12).2. - Motor according to claim 1, characterized in that it comprises control means (29) of said distribution member (12). 3. - Moteur selon la revendication 2, caractérisé en ce que lesdits moyens de commande sont pilotés par des moyens de détection (27) du niveau de température dudit catalyseur (9).3. - Engine according to claim 2, characterized in that said control means are controlled by detection means (27) of the temperature level of said catalyst (9). 4. - Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que l'une au moins desdites première et deuxième canalisations d'échappement comporte des moyens de restriction de sa section de passage.4. - Device according to one of claims 1 to 3, characterized in that at least one of said first and second exhaust pipes comprises means for restricting its passage section. 5. - Dispositif selon l'une des revendications 1 à 4, caractérisé en que la première canalisation comporte un moyen d'obturation périodique asservi à la vitesse de rotation du moteur.5. - Device according to one of claims 1 to 4, characterized in that the first pipe comprises a periodic shutter means controlled by the speed of rotation of the motor. 6. - Dispositif selon la revendication 5, caractérisé en ce que ledit organe d'obturation périodique est un boisseau tournant.6. - Device according to claim 5, characterized in that said periodic shutter member is a rotating plug. 7. - Procédé d'amorçage rapide d'un catalyseur contenu dans un pot catalytique d'un moteur deux temps, caractérisé en ce que l'on transfère la fraction la plus chaude des gaz d'échappement en amont dudit catalyseur et en ce que l'on transfère en aval dudit catalyseur la fraction restante des gaz d'échappement, et cela tant que ledit catalyseur n'est pas amorcé.7. - Method for rapidly priming a catalyst contained in a catalytic converter of a two-stroke engine, characterized in that the hottest fraction of the exhaust gases is transferred upstream of said catalyst and in that the remaining fraction of the exhaust gases is transferred downstream of said catalyst, and this until said catalyst is not primed. 8. - Procédé selon la revendication 7, caractérisé en ce que l'on détermine l'amorçage du catalyseur en détectant une grandeur liée à la température dudit catalyseur.8. - Method according to claim 7, characterized in that one determines the initiation of the catalyst by detecting a quantity related to the temperature of said catalyst.
EP87402904A 1986-12-19 1987-12-18 Apparatus and method for the rapid excitation of an oxidation catalyst for a two-stroke engine Expired - Lifetime EP0278191B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87402904T ATE72298T1 (en) 1986-12-19 1987-12-18 DEVICE AND METHOD FOR FAST ENCOURAGEMENT OF AN OXIDATION CATALYST FOR A TWO-STROKE ENGINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8618010A FR2608677B1 (en) 1986-12-19 1986-12-19 DEVICE AND METHOD FOR QUICK PRIMING OF AN OXIDATION CATALYST FOR A TWO-STROKE ENGINE
FR8618010 1986-12-19

Publications (2)

Publication Number Publication Date
EP0278191A1 true EP0278191A1 (en) 1988-08-17
EP0278191B1 EP0278191B1 (en) 1992-01-29

Family

ID=9342183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402904A Expired - Lifetime EP0278191B1 (en) 1986-12-19 1987-12-18 Apparatus and method for the rapid excitation of an oxidation catalyst for a two-stroke engine

Country Status (7)

Country Link
US (1) US4862689A (en)
EP (1) EP0278191B1 (en)
JP (1) JPS6419108A (en)
AT (1) ATE72298T1 (en)
DE (1) DE3776553D1 (en)
FR (1) FR2608677B1 (en)
IN (1) IN170523B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655376A1 (en) * 1989-12-06 1991-06-07 Peugeot DEVICE FOR EXHAUSTING AND ANTI-POLLUTION TREATMENT OF EXHAUST GAS FROM AN ENGINE AND CORRESPONDING METHOD.
EP0484226A1 (en) * 1990-11-02 1992-05-06 Regie Nationale Des Usines Renault S.A. Two-stroke engine
DE4117874A1 (en) * 1991-05-31 1992-12-03 Bayerische Motoren Werke Ag INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS TREATMENT DEVICE
WO1993012327A1 (en) * 1991-12-12 1993-06-24 Emitec Gesellschaft Für Emissionstechnologie Mbh Arrangement for purifying exhaust gases, especially from internal combustion engines for motor vehicles
FR2707343A1 (en) * 1993-07-06 1995-01-13 Renault Two-cycle internal combustion engine.

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE37230E1 (en) 1987-10-26 2001-06-19 Orbital Engine Company (Australia) Proprietary Limited Two stroke cycle internal combustion engines
CA1336413C (en) * 1987-10-26 1995-07-25 Mark Lear Two stroke cycle internal combustion engines
EP0339969B1 (en) * 1988-04-27 1993-09-29 Ricardo Group Plc Two-stroke otto cycle engines
US4969329A (en) * 1989-05-05 1990-11-13 General Motors Corporation Two cycle engine with exhaust emission control
US4969330A (en) * 1989-06-21 1990-11-13 General Motors Corporation Two cycle engine catalytic emission control
US4993225A (en) * 1989-06-21 1991-02-19 General Motors Corporation Two cycle engine vapor emission control
DE9017762U1 (en) * 1990-11-14 1992-03-05 Walker Deutschland GmbH, 6806 Viernheim Device for using a catalyst for a two-stroke engine
JPH0547331U (en) * 1991-11-21 1993-06-22 株式会社共立 2-cycle engine
US5386694A (en) * 1992-08-24 1995-02-07 Honda Giken Kogyo Kabushiki Kaisha Control system for internal combustion engines
GB2280711A (en) * 1993-08-05 1995-02-08 Ford Motor Co Two stroke i.c. engine with catalytic converters.
JP3663664B2 (en) * 1994-09-09 2005-06-22 株式会社デンソー Exhaust pipe switchgear
US7146806B2 (en) * 2004-07-07 2006-12-12 Homelite Technologies, Ltd. Internal combustion engine cylinder and muffler assembly with catalytic converter
JP6019594B2 (en) * 2012-01-27 2016-11-02 株式会社Ihi Denitration equipment
DE112016005069T5 (en) * 2015-12-02 2018-07-12 Borgwarner Inc. DIVIDED EXHAUST GAS TURBOCHARGER
CN105435605A (en) * 2015-12-24 2016-03-30 哈尔滨锅炉厂有限责任公司 High temperature ammonia spraying device used for SCR (selective catalytic reduction) denitrification device and ammonia spraying method
EP3569834A1 (en) * 2018-05-18 2019-11-20 Winterthur Gas & Diesel Ltd. Internal combustion engine and method for reducing nitrogen oxide emissions
DE102020131039A1 (en) * 2020-11-24 2022-05-25 Tenneco Gmbh exhaust gas cooling device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE963736C (en) * 1951-02-01 1957-05-09 Kloeckner Humboldt Deutz Ag Two-stroke internal combustion engine
FR2097886A5 (en) * 1970-12-17 1972-03-03 August Paul

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1451881A1 (en) * 1963-09-07 1969-01-23 Daimler Benz Ag Device for the catalytic post-combustion of exhaust gases from an internal combustion engine, in particular in motor vehicles
JPS61907A (en) * 1984-06-13 1986-01-06 Fujitsu Ltd Magnetoresistance effect type playback head

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE963736C (en) * 1951-02-01 1957-05-09 Kloeckner Humboldt Deutz Ag Two-stroke internal combustion engine
FR2097886A5 (en) * 1970-12-17 1972-03-03 August Paul

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655376A1 (en) * 1989-12-06 1991-06-07 Peugeot DEVICE FOR EXHAUSTING AND ANTI-POLLUTION TREATMENT OF EXHAUST GAS FROM AN ENGINE AND CORRESPONDING METHOD.
EP0431985A1 (en) * 1989-12-06 1991-06-12 Automobiles Peugeot Evacuation and anti-pollution treatment device of exhaust gases of an engine
EP0484226A1 (en) * 1990-11-02 1992-05-06 Regie Nationale Des Usines Renault S.A. Two-stroke engine
FR2668798A1 (en) * 1990-11-02 1992-05-07 Renault TWO-STROKE ENGINE.
US5209192A (en) * 1990-11-02 1993-05-11 Regie Nationale Des Usiness Renault Two-cycle engine
DE4117874A1 (en) * 1991-05-31 1992-12-03 Bayerische Motoren Werke Ag INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS TREATMENT DEVICE
WO1993012327A1 (en) * 1991-12-12 1993-06-24 Emitec Gesellschaft Für Emissionstechnologie Mbh Arrangement for purifying exhaust gases, especially from internal combustion engines for motor vehicles
FR2707343A1 (en) * 1993-07-06 1995-01-13 Renault Two-cycle internal combustion engine.
EP0637679A1 (en) * 1993-07-06 1995-02-08 Regie Nationale Des Usines Renault S.A. Two strobe engine

Also Published As

Publication number Publication date
US4862689A (en) 1989-09-05
FR2608677A1 (en) 1988-06-24
FR2608677B1 (en) 1989-04-28
EP0278191B1 (en) 1992-01-29
IN170523B (en) 1992-04-04
JPS6419108A (en) 1989-01-23
ATE72298T1 (en) 1992-02-15
JPH0448926B2 (en) 1992-08-10
DE3776553D1 (en) 1992-03-12

Similar Documents

Publication Publication Date Title
EP0278191B1 (en) Apparatus and method for the rapid excitation of an oxidation catalyst for a two-stroke engine
FR2479325A1 (en) INSTALLATION FOR POWERING IN MIXTURE OF OPERATION OF INTERNAL COMBUSTION ENGINES
EP0058619B1 (en) Four-stroke combustion engine adapted for delivering temporary overpower
FR2571781A1 (en) FOUR-TIME INTERNAL COMBUSTION ENGINE WITH SELF-IGNITION OR CONTROLLED IGNITION, WITH DIRECT FUEL INJECTION, WITH TURBO-FAN SUPPLY AND INTERNAL RECYCLING OF EXHAUST GASES ACCORDING TO LOAD
FR2575523A1 (en) DEVICE AND METHOD FOR INJECTING AIR-ASSISTED FUEL OR COMPRESSED GAS INTO A MOTOR
EP0235481A1 (en) Device for introducing gas under pressure into a combustion chamber of an internal-combustion engine
FR2530730A1 (en) COMPRESSION-IGNITION, TURBO-PRESSURIZED ENGINE, WHICH CAN OPERATE WITH LOW COMPRESSION RATES
EP0311499A1 (en) Two-stroke engine with pneumatic injection and exhaust flow throttle
FR2473631A1 (en) FOUR-STROKE INTERNAL COMBUSTION ENGINE
FR2572770A1 (en) ROTARY INTERNAL COMBUSTION ENGINE
EP0786045A1 (en) Two-stroke engine comprising an enhanced injection device and associated injection method
FR2649157A1 (en) TWO-STROKE PNEUMATIC INJECTION AND FLOW RESTRICTION ENGINES IN AT LEAST ONE TRANSFER DUCT
EP1544434A1 (en) Method for controlling turbo-charged internal-combustion engine
FR2752880A1 (en) Supercharger for motor vehicle IC-engine
FR2841597A1 (en) TWO-STROKE ENGINE AND METHOD FOR OPERATING THE SAME
FR2737253A1 (en) TWO-STROKE INTERNAL COMBUSTION ENGINE
FR2763644A1 (en) Two-stroke internal combustion engine
FR2619598A1 (en) METHOD FOR CONTROLLING THE INJECTION PHASE OF AN ELECTRONIC FUEL INJECTION
EP0484226A1 (en) Two-stroke engine
EP0637679A1 (en) Two strobe engine
EP0688944B1 (en) Two stroke combustion engine
FR2851617A1 (en) METHOD AND DEVICE FOR CONTROLLING A VEHICLE HEAT ENGINE WITH INCREASED THERMAL POWER
FR2912465A1 (en) Piston-type internal combustion engine for motor vehicle, has cylinder containing gas assembly with volume of burnt gas and load, and progressive inlet unit introducing load in chamber in order to confine and develop combustion in chamber
FR2487009A1 (en) INTERNAL COMBUSTION ENGINE HAVING A SECONDARY INTAKE CIRCUIT
EP0665369B1 (en) Device and method for stopping a two-stroke internal combustion engine with autoignition

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

AK Designated contracting states

Kind code of ref document: A1

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

17P Request for examination filed

Effective date: 19881016

17Q First examination report despatched

Effective date: 19891108

ITF It: translation for a ep patent filed

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

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

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

REF Corresponds to:

Ref document number: 72298

Country of ref document: AT

Date of ref document: 19920215

Kind code of ref document: T

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

Ref document number: 3776553

Country of ref document: DE

Date of ref document: 19920312

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
EAL Se: european patent in force in sweden

Ref document number: 87402904.4

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

Ref country code: AT

Payment date: 19991007

Year of fee payment: 13

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

Ref country code: CH

Payment date: 19991101

Year of fee payment: 13

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

Ref country code: BE

Payment date: 19991222

Year of fee payment: 13

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

Ref country code: NL

Payment date: 19991231

Year of fee payment: 13

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

Ref country code: AT

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

Effective date: 20001218

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

Ref country code: LI

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

Effective date: 20001231

Ref country code: CH

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

Effective date: 20001231

Ref country code: BE

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

Effective date: 20001231

BERE Be: lapsed

Owner name: AUTOMOBILES CITROEN

Effective date: 20001231

Owner name: AUTOMOBILES PEUGEOT

Effective date: 20001231

Owner name: INSTITUT FRANCAIS DU PETROLE

Effective date: 20001231

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: 20010701

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20010701

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

Ref country code: SE

Payment date: 20010914

Year of fee payment: 15

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

Ref country code: GB

Payment date: 20011101

Year of fee payment: 15

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

Ref country code: DE

Payment date: 20011227

Year of fee payment: 15

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

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: 20021218

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: 20021219

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: 20030701

EUG Se: european patent has lapsed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20021218

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: 20051218