FR2885177A1 - Internal combustion engine e.g. diesel engine, has air intake circuit allowing air into combustion cylinders, where part of air flow is aspirated by recirculation cylinder via conduit placed downstream of recirculation cylinder - Google Patents
Internal combustion engine e.g. diesel engine, has air intake circuit allowing air into combustion cylinders, where part of air flow is aspirated by recirculation cylinder via conduit placed downstream of recirculation cylinder Download PDFInfo
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- FR2885177A1 FR2885177A1 FR0551081A FR0551081A FR2885177A1 FR 2885177 A1 FR2885177 A1 FR 2885177A1 FR 0551081 A FR0551081 A FR 0551081A FR 0551081 A FR0551081 A FR 0551081A FR 2885177 A1 FR2885177 A1 FR 2885177A1
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- recirculation cylinder
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Classifications
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- 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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/30—Arrangements for supply of additional air
- F01N3/32—Arrangements for supply of additional air using air pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B41/00—Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
- F02B41/02—Engines with prolonged expansion
- F02B41/06—Engines with prolonged expansion in compound cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/04—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only
- F02B47/08—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being other than water or steam only the substances including exhaust gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/06—Cutting-out cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
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- 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
- F02M26/01—Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
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- 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
- F02M26/34—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with compressors, turbines or the like in the recirculation passage
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- 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
- F02M26/37—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with temporary storage of recirculated exhaust gas
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- 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
- F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
- F02M26/43—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/006—Controlling exhaust gas recirculation [EGR] using internal EGR
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
Moteur à combustion interne équipé d'un dispositif et d'un procédé deInternal combustion engine equipped with a device and a method of
compression des qaz d'échappement et de l'air réintroduit à l'échappement. compression of the exhaust gas and air reintroduced to the exhaust.
La présente invention concerne les moteurs à combustion interne à allumage commandé ou à allumage par compression, à aspiration naturelle ou suralimentés. Elle s'applique plus particulièrement à la recirculation des gaz d'échappement (E.G.R) et à l'injection d'air à l'échappement (I.A. E.) de tels moteurs. The present invention relates to internal combustion engines spark ignition or compression ignition, naturally aspirated or supercharged. It applies more particularly to the recirculation of exhaust gas (E.G.R) and to the exhaust air injection (I.A.E) of such engines.
L'E.G.R. est une technique utilisée pour réduire la consommation et les émissions en oxyde d'azote et également pour améliorer les performances d'un moteur à combustion interne. Il s'agit de rediriger les gaz d'échappement vers l'admission du moteur où ils se mélangent à l'air frais. The E.G.R. is a technique used to reduce nitrogen oxide consumption and emissions and also to improve the performance of an internal combustion engine. This is to redirect the exhaust to the engine intake where they mix with fresh air.
Les gaz d'échappement étant à très haute température au sortir de la chambre de combustion, l'I.A.E permet un réallumage des hydrocarbures imbrûlés et par conséquent une pollution moindre. Since the exhaust gases are at a very high temperature at the exit of the combustion chamber, the I.A.E allows a reignition of unburned hydrocarbons and consequently less pollution.
Traditionnellement, le circuit d'E.G.R prélève une partie du débit d'échappement pour le réintroduire à l'admission. Le débit maximum de gaz dépend de la surpression relative des gaz d'échappement par rapport à l'air d'admission. Ce débit maximum est nul quand la pression d'échappement est inférieure à celle présente à l'admission. Dans ce cas de figure I' E.G.R devient impossible. On essaie donc de réduire la zone de régime et de pression moyenne effective défavorable à la recirculation en optimisant la perméabilité du circuit d' E.G.R, mais, ceci ne suffit pas à atteindre les objectifs de taux d' E.G.R. optimum pour tous les points de fonctionnement moteur. Traditionally, the E.G.R circuit takes part of the exhaust flow to reintroduce it to the intake. The maximum gas flow rate depends on the relative overpressure of the exhaust gas with respect to the intake air. This maximum flow rate is zero when the exhaust pressure is lower than that present at the intake. In this case I 'E.G.R becomes impossible. An attempt is therefore made to reduce the effective mean and effective pressure zone for recirculation by optimizing the permeability of the E.G.R circuit, but this is not sufficient to achieve the E.G.R. optimum for all engine operating points.
La publication JP200274314 décrit un moteur à combustion interne pour lequel la génération de gaz brûlés sous pression est réalisée à l'aide d'un moteur auxiliaire. Il s'agit en fait du moteur actionnant la pompe de refroidissement du moteur principal. Ce moteur aspire dans un premier temps de l'air carburé pour s'auto-allumer. Les gaz brûlés en provenance de ce moteur auxiliaire sont ensuite dirigés vers l'admission des cylindres du moteur principal. The publication JP200274314 describes an internal combustion engine for which the generation of flue gases under pressure is carried out using an auxiliary engine. This is in fact the motor driving the main engine cooling pump. This engine first aspirates carbureted air to self-ignite. The flue gases from this auxiliary engine are then directed to the inlet of the main engine cylinders.
Cette solution présente plusieurs inconvénients. Tout d'abord elle implique la consommation d'une partie du carburant pour l'alimentation du moteur auxiliaire. Ensuite elle fait appel à deux moteurs ayant des cycles thermodynamiques différents (le moteur principal est à allumage commandé tandis que le moteur auxiliaire est à allumage par compression) ce qui complique considérablement le dispositif. Enfin cette réalisation ne prévoit pas de récupérer sur le même arbre les couples du moteur principal et du moteur auxiliaire. This solution has several disadvantages. First of all it involves the consumption of a portion of the fuel for the auxiliary engine power supply. Then it uses two engines having different thermodynamic cycles (the main engine is spark ignition while the auxiliary engine is compression ignition) which greatly complicates the device. Finally, this embodiment does not provide for recovering on the same shaft the torques of the main motor and the auxiliary motor.
La présente invention a donc pour objectif de pallier aux inconvénients susmentionnés, en fournissant un moteur à combustion interne équipé d'un dispositif autorisant l'E.G.R. sur une large plage de points de fonctionnement, et ceci sans surconsommation de carburant. Un objectif additionnel de cette invention est de fournir une pompe d'I.A.E. The present invention therefore aims to overcome the aforementioned drawbacks by providing an internal combustion engine equipped with a device allowing E.G.R. over a wide range of operating points, and this without over-consumption of fuel. An additional object of this invention is to provide a I.A.E.
Dans ce but le moteur selon l'invention comporte des moyens d'orientation d'au moins une partie des gaz d'échappement en provenance de premiers cylindres de combustion vers un dernier cylindre de recirculation qui les refoule sans combustion. For this purpose the engine according to the invention comprises means for directing at least a portion of the exhaust gas from the first combustion cylinders to a last recirculation cylinder which represses without combustion.
Selon une autre caractéristique de l'invention le piston du cylindre de recirculation est entraîné par le vilebrequin des premiers cylindres. According to another characteristic of the invention the piston of the recirculation cylinder is driven by the crankshaft of the first cylinders.
Avantageusement, les moyens d'obturation du cylindre de recirculation sont entraînés à partir du vilebrequin des cylindres de combustion. Advantageously, the closure means of the recirculation cylinder are driven from the crankshaft of the combustion cylinders.
De manière avantageuse, les cylindres sont au nombre de quatre. Advantageously, the cylinders are four in number.
La présente invention concerne également un procédé de commande d'un moteur à combustion interne caractérisé en ce que les gaz d'échappement des cylindres de combustion sont aspirés dans le cylindre de recirculation durant la phase de descente du piston dans le cylindre de recirculation et en ce que, les gaz d'échappement sont refoulés vers l'admission du moteur durant la phase de remontée du piston dans le cylindre de recirculation. The present invention also relates to a method for controlling an internal combustion engine, characterized in that the exhaust gases from the combustion cylinders are sucked into the recirculation cylinder during the phase of descent of the piston into the recirculation cylinder and into the exhaust gases are discharged to the intake of the engine during the raising phase of the piston in the recirculation cylinder.
Avantageusement, les moyens d'obturation des moyens d'échappement du cylindre de recirculation sont ouverts durant la phase de descente du piston dans le cylindre de recirculation et, les moyens d'obturation des moyens d'admission du cylindre de recirculation sont ouverts durant la phase de remontée du piston dans le cylindre de recirculation. Advantageously, the closure means of the exhaust means of the recirculation cylinder are open during the descent phase of the piston in the recirculation cylinder and, the closure means of the admission means of the recirculation cylinder are open during the recovery phase of the piston in the recirculation cylinder.
En outre ce procédé de commande d'un moteur à combustion interne présente au moins un mode de fonctionnement dans lequel une partie de l'air d'admission est aspiré par le cylindre de recirculation pour être refoulé directement sans combustion vers l'échappement du moteur. In addition, this control method of an internal combustion engine has at least one mode of operation in which part of the intake air is sucked by the recirculation cylinder to be discharged directly without combustion to the engine exhaust. .
Selon une caractéristique de ce mode de fonctionnement, une partie au moins de l'air d'admission est aspirée dans le cylindre de recirculation durant la phase de descente de son pistons et, l'air aspiré est refoulé durant la phase de remontée du piston dans le dernier cylindre. According to a characteristic of this mode of operation, at least a portion of the intake air is drawn into the recirculation cylinder during the descent phase of its pistons and the sucked air is forced back during the piston recovery phase. in the last cylinder.
Le procédé de commande selon l'invention présente en outre au moins un mode de fonctionnement pour lequel les moyens d'obturation des moyens d'admission et les moyens d'obturation des moyens d'échappement ne sont jamais ouverts. The control method according to the invention also has at least one mode of operation for which the means for closing the intake means and the means for closing the exhaust means are never open.
Enfin, selon un autre mode de ce procédé de commande, le cylindre de recirculation fonctionne suivant le même cycle thermodynamique que les premiers cylindres. Finally, according to another mode of this control method, the recirculation cylinder operates according to the same thermodynamic cycle as the first cylinders.
D'autres avantages et caractéristiques apparaîtront à la lecture d'un des modes de réalisation de l'invention, non limitatif, faite en référence aux figures qui représentent: figure 1: une vue schématique d'un moteur selon l'invention comportant N cylindres actifs plus un cylindre auxiliaire fonctionnant en pompe E.G.R. Other advantages and characteristics will become apparent on reading one of the embodiments of the invention, which is not limiting, with reference to the figures which represent: FIG. 1: a schematic view of an engine according to the invention comprising N cylinders active plus an auxiliary cylinder operating as an EGR pump
figure 2: un chronogramme de la loi de distribution du cylindre auxiliaire dans le mode de fonctionnement de la figure 1. FIG. 2: a timing diagram of the distribution law of the auxiliary cylinder in the operating mode of FIG. 1.
figure 3: une vue schématique du même moteur fonctionnant selon le mode N cylindres actifs avec le cylindre auxiliaire déconnecté. Figure 3 is a schematic view of the same engine operating in N-mode active cylinders with the disconnected auxiliary cylinder.
figure 4: un chronogramme de la loi de distribution du cylindre auxiliaire dans le mode de fonctionnement de la figure 3. FIG. 4 is a timing diagram of the distribution law of the auxiliary cylinder in the operating mode of FIG. 3.
- figure 5: une vue schématique d'un moteur selon l'invention fonctionnant selon le mode N cylindres actifs et le cylindre auxiliaire actif de manière classique. - Figure 5: a schematic view of a motor according to the invention operating in the N-mode active cylinders and the auxiliary cylinder active in a conventional manner.
figure 6: un chronogramme de la loi de distribution du cylindre auxiliaire dans le mode de fonctionnement de la figure 5 - figure 7: une vue schématique d'un moteur selon l'invention fonctionnant selon le mode N cylindres actifs avec le cylindre auxiliaire assurant la fonction de pompe I.A.E. FIG. 6: a timing diagram of the distribution law of the auxiliary cylinder in the operating mode of FIG. 5; FIG. 7: a schematic view of an engine according to the invention operating in the N-roll mode with the auxiliary cylinder providing the IAE pump function
figure 8: un chronogramme de la loi de distribution du cylindre auxiliaire dans le mode de fonctionnement de la figure 7. FIG. 8: a timing diagram of the distribution law of the auxiliary cylinder in the operating mode of FIG. 7.
La figure 1 est une vue schématique du premier mode de fonctionnement du moteur à combustion interne selon l'invention. Sur cette figure on voit les cylindres de combustion 1, 2 et 3 fonctionnant classiquement. Ces cylindres de combustion sont alimentés en air par le circuit d'amission 4 et refoulent les gaz brûlés par le circuit d'échappement 5. Le circuit d' E.G.R comprend une vanne 6, un circuit 7 conduisant les gaz brûlés à un autre cylindre, le cylindre de recirculation 8, structurellement identique aux cylindres 1, 2 et 3 (alésage, course, cycle thermodynamique, forme de chambre, conduits d'amission et d'échappement). Un conduit 9 est placé en aval du cylindre 8 afin de rediriger les gaz brûlés vers l'admission d'air 4. Figure 1 is a schematic view of the first operating mode of the internal combustion engine according to the invention. In this figure we see the combustion cylinders 1, 2 and 3 operating classically. These combustion cylinders are supplied with air by the amission circuit 4 and discharge the burnt gases by the exhaust circuit 5. The EGR circuit comprises a valve 6, a circuit 7 leading the burnt gases to another cylinder, the recirculation cylinder 8, structurally identical to the cylinders 1, 2 and 3 (bore, stroke, thermodynamic cycle, chamber shape, intake and exhaust ducts). A conduit 9 is placed downstream of the cylinder 8 in order to redirect the burnt gases towards the air intake 4.
Dans le mode de fonctionnement de la figure 1, les cylindres de combustion fonctionnent suivant un cycle à quatre temps, à allumage commandé ou à allumage par compression. Le mouvement alternatif du piston dans le cylindre de recirculation 8 est induit par un système bielle\manivelle dont l'entraînement est assuré par le vilebrequin des cylindres de combustion 1, 2 et 3, soit directement, soit via une transmission. In the operating mode of FIG. 1, the combustion cylinders operate in a four-stroke, spark ignition or compression ignition cycle. The reciprocating movement of the piston in the recirculation cylinder 8 is induced by a rod / crank system whose drive is provided by the crankshaft of the combustion cylinders 1, 2 and 3, either directly or via a transmission.
La figure 2 permet de comprendre la loi de distribution du cylindre de recirculation 8 pour ce mode de fonctionnement. Sur cette figure le chronogramme 12 donne la position des soupapes d'admission, le chronogrammes 13 la position des soupapes d'échappement et le chronogramme 14 la course du piston dans le cylindre 8 entre le point mort bas et le point mort haut. Lorsque le besoin en E.G.R. se fait sentir, les soupapes d'échappement s'ouvrent concomitamment à la descente du piston dans le cylindre de recirculation 8. Les gaz brûlés en provenance des cylindres de combustion 1, 2,3 sont aspirés dans le cylindre de recirculation 8. Les soupapes d'échappement se referment lorsque le piston du cylindre de recirculation 8 atteint son point mort bas A. Les soupapes d'admission s'ouvrent alors, et restent ouvertes lors de la remontée du piston qui chasse alors l'E.G.R sous pression vers l'admission, autorisant ainsi un fort taux d'E.G.R. même à forte charge sur un moteur suralimenté. Le taux d'E.G.R. peut de plus être modulé par la vanne 6 intercalée entre l'échappement des cylindres de combustion 1, 2 et 3 et celui du cylindre de recirculation 8. FIG. 2 makes it possible to understand the distribution law of the recirculation cylinder 8 for this mode of operation. In this figure the timing diagram 12 gives the position of the intake valves, the timing diagram 13 the position of the exhaust valves and the timing diagram 14 the stroke of the piston in the cylinder 8 between the bottom dead center and the top dead center. When the need for E.G.R. The exhaust valves open simultaneously with the descent of the piston into the recirculation cylinder 8. The burnt gases from the combustion cylinders 1, 2, 3 are sucked into the recirculation cylinder 8. The valves Exhaust valves close when the piston of the recirculation cylinder 8 reaches its bottom dead point A. The intake valves then open, and remain open during the ascent of the piston which then drives the EGR under pressure to the admission, thus allowing a high rate of EGR even at high load on a supercharged engine. E.G.R. can be further modulated by the valve 6 interposed between the exhaust of the combustion cylinders 1, 2 and 3 and that of the recirculation cylinder 8.
Dans ce mode de fonctionnement le cylindre auxiliaire joue le rôle de pompe aspirante\refoulante de gaz brûlés. In this mode of operation, the auxiliary cylinder acts as a suction pump for repressing burned gases.
Dans le mode de fonctionnement de la figure 3, les soupapes d'admission et d'échappement sont fermées en permanence afin de limiter les pertes par pompage. Ce mode de fonctionnement est essentiellement intéressant lorsque le cycle thermodynamique est à allumage commandé. Dans ce cas, la déconnexion du cylindre de recirculation 8 permet d'augmenter la charge des postes qui restent actifs, et donc de diminuer leurs pertes par pompage et d'augmenter le rendement du moteur. In the operating mode of Figure 3, the intake and exhaust valves are permanently closed to limit the losses by pumping. This mode of operation is essentially interesting when the thermodynamic cycle is spark ignition. In this case, the disconnection of the recirculation cylinder 8 makes it possible to increase the load of the stations that remain active, and thus to reduce their losses by pumping and to increase the efficiency of the motor.
Comme le montre le chronogramme de la figure 4, seul le piston du cylindre auxiliaire continue sa course représentée par la courbe 14. As shown in the timing diagram of FIG. 4, only the piston of the auxiliary cylinder continues its stroke represented by curve 14.
La figure 5 montre un autre mode de fonctionnement du moteur selon l'invention. Dans ce mode, le cylindre de recirculation 8 fonctionne suivant le même cycle thermodynamique et avec la même charge que les cylindres de combustion 1, 2 et 3, éventuellement avec I'E.G.R symbolisé par la ligne en points tillés 15. FIG. 5 shows another mode of operation of the motor according to the invention. In this mode, the recirculation cylinder 8 operates according to the same thermodynamic cycle and with the same charge as the combustion cylinders 1, 2 and 3, possibly with the E.G.R symbolized by the line in point-tilted 15.
La figure 6 donne la loi de distribution du cylindre auxiliaire pour ce mode de fonctionnement du moteur. Sur cette figure le chronogramme 12 donne la position des soupapes d'admission, le chronogramme 13 la position des soupapes d'échappement et le chronogramme 14 la course du piston dans le cylindre 8. On constate ici le fonctionnement classique du piston et des soupapes du cylindre 8. Figure 6 gives the distribution law of the auxiliary cylinder for this mode of operation of the engine. In this figure the timing diagram 12 gives the position of the intake valves, the timing diagram 13 the position of the exhaust valves and the timing diagram 14 the stroke of the piston in the cylinder 8. Here we see the conventional operation of the piston and the valves of the cylinder 8.
La figure 7 est une vue schématique du dernier mode de fonctionnement du moteur à combustion interne selon l'invention. Dans ce mode, une partie du débit d'air moteur est aspirée par le cylindre auxiliaire via le conduit 9. Cet air est comprimé par le cylindre de recirculation 8 puis il est refoulé dans le conduit d'échappement 5 des autres cylindres. Cet air n'est pas mélangé à du carburant lors de son passage dans le cylindre 8.11 joue le rôle d'oxydant vis- à-vis des hydrocarbures imbrûlés et du monoxyde de carbone présent dans les gaz d'échappement. Il permet donc de limiter les émissions polluantes du moteur. Figure 7 is a schematic view of the last mode of operation of the internal combustion engine according to the invention. In this mode, a portion of the engine air flow is sucked by the auxiliary cylinder via the conduit 9. This air is compressed by the recirculation cylinder 8 and is then forced into the exhaust duct 5 of the other cylinders. This air is not mixed with fuel as it passes through the cylinder 8.11 plays the role of oxidizer vis-à-vis unburned hydrocarbons and carbon monoxide present in the exhaust gas. It thus makes it possible to limit the polluting emissions of the engine.
Les chronogrammes 12, 13, 14 donnent respectivement le motif d'ouverture\fermeture des soupapes d'admission et d'échappement ainsi que la course du piston dans le cylindre de recirculation 8. L'aspiration de l'air s'effectue sur le demi tour moteur où le piston descend. La soupape d'admission du cylindre de recirculation 8 est donc ouverte pendant la descente du piston dans le cylindre de recirculation 8 jusqu'à ce qu'il atteigne son point mort bas. Puis la soupape d'échappement du même cylindre 8 est ouverte et la remontée du piston dans le cylindre auxiliaire provoque le refoulement de l'air frais sous pression qui entre en contact avec les gaz d'échappement. The chronograms 12, 13, 14 respectively give the opening / closing pattern of the intake and exhaust valves as well as the stroke of the piston in the recirculation cylinder 8. The suction of the air is effected on the half engine turn where the piston goes down. The intake valve of the recirculation cylinder 8 is thus open during the descent of the piston in the recirculation cylinder 8 until it reaches its bottom dead point. Then the exhaust valve of the same cylinder 8 is open and the rise of the piston in the auxiliary cylinder causes the discharge of fresh air under pressure which comes into contact with the exhaust gas.
Pour les quatre modes de fonctionnement précédemment décrits, le mouvement alternatif du piston dans le cylindre de recirculation 8 est induit par un système bielle manivelle dont l'entraînement est assuré par le vilebrequin des cylindre actifs 1, 2 et 3, soit directement, soit via une transmission. For the four modes of operation previously described, the reciprocating movement of the piston in the recirculation cylinder 8 is induced by a crank system whose driving is ensured by the crankshaft of the active cylinders 1, 2 and 3, either directly or via a transmission.
Pour les modes de fonctionnement où les soupapes d'admission et d'échappement du cylindre de recirculation 8 sont actives, la distribution de ce cylindre de recirculation 8 peut aussi être entraînée par celle des cylindres actifs 1, 2, 3, directement, via une transmission ou grâce à un entraînement électromécanique. For operating modes where the intake and exhaust valves of the recirculation cylinder 8 are active, the distribution of this recirculation cylinder 8 can also be driven by that of the active cylinders 1, 2, 3, directly, via a transmission or through an electromechanical drive.
La vanne 6 qui sépare l'échappement des cylindres de combustion 1, 2 et 3 de celui du cylindre de recirculation 8 peut être à 3 voies. Ainsi, elle autorisera l'alimentation du moteur en E.G.R, dans le mode de fonctionnement où le cylindre auxiliaire fonctionne suivant le même cycle thermodynamique que les cylindres de combustion. Cette vanne peut en outre intégrer la fonction de refroidissement de l'E.G.R. The valve 6 which separates the exhaust of the combustion cylinders 1, 2 and 3 from that of the recirculation cylinder 8 may be 3-way. Thus, it will allow the engine power E.G.R, in the operating mode where the auxiliary cylinder operates in the same thermodynamic cycle as the combustion cylinders. This valve can further integrate the cooling function of the E.G.R.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0551081A FR2885177A1 (en) | 2005-04-27 | 2005-04-27 | Internal combustion engine e.g. diesel engine, has air intake circuit allowing air into combustion cylinders, where part of air flow is aspirated by recirculation cylinder via conduit placed downstream of recirculation cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0551081A FR2885177A1 (en) | 2005-04-27 | 2005-04-27 | Internal combustion engine e.g. diesel engine, has air intake circuit allowing air into combustion cylinders, where part of air flow is aspirated by recirculation cylinder via conduit placed downstream of recirculation cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2885177A1 true FR2885177A1 (en) | 2006-11-03 |
Family
ID=35431299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0551081A Withdrawn FR2885177A1 (en) | 2005-04-27 | 2005-04-27 | Internal combustion engine e.g. diesel engine, has air intake circuit allowing air into combustion cylinders, where part of air flow is aspirated by recirculation cylinder via conduit placed downstream of recirculation cylinder |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2885177A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010139733A1 (en) * | 2009-06-04 | 2010-12-09 | Avl List Gmbh | Internal combustion engine having several cylinders |
| EP2097282B1 (en) * | 2006-11-27 | 2011-07-20 | Robert Bosch GmbH | Hybrid drive with valve deactivation |
| EP2397674A1 (en) * | 2010-06-18 | 2011-12-21 | C.R.F. Società Consortile per Azioni | Internal combustion engine with cylinders that can be de-activated, with exhaust gas recirculation by variable control of the intake valves, and method for controlling an internal combustion eingine |
| FR3007457A1 (en) * | 2013-06-24 | 2014-12-26 | Peugeot Citroen Automobiles Sa | MOTOR VEHICLE COMBUSTION ENGINE WITH ENHANCED EXHAUST RECIRCULATION |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2097282B1 (en) * | 2006-11-27 | 2011-07-20 | Robert Bosch GmbH | Hybrid drive with valve deactivation |
| WO2010139733A1 (en) * | 2009-06-04 | 2010-12-09 | Avl List Gmbh | Internal combustion engine having several cylinders |
| EP2397674A1 (en) * | 2010-06-18 | 2011-12-21 | C.R.F. Società Consortile per Azioni | Internal combustion engine with cylinders that can be de-activated, with exhaust gas recirculation by variable control of the intake valves, and method for controlling an internal combustion eingine |
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| FR3007457A1 (en) * | 2013-06-24 | 2014-12-26 | Peugeot Citroen Automobiles Sa | MOTOR VEHICLE COMBUSTION ENGINE WITH ENHANCED EXHAUST RECIRCULATION |
| EP2818681A1 (en) * | 2013-06-24 | 2014-12-31 | Peugeot Citroën Automobiles Sa | Combustion engine of a motor vehicle with improved exhaust gas recirculation |
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