EP0497677B1 - Improvements for exhaust gas recirculation devices - Google Patents
Improvements for exhaust gas recirculation devices Download PDFInfo
- Publication number
- EP0497677B1 EP0497677B1 EP92400202A EP92400202A EP0497677B1 EP 0497677 B1 EP0497677 B1 EP 0497677B1 EP 92400202 A EP92400202 A EP 92400202A EP 92400202 A EP92400202 A EP 92400202A EP 0497677 B1 EP0497677 B1 EP 0497677B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- recycling
- piston
- sump
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
-
- 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
- F02M26/52—Systems for actuating EGR valves
- F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
Definitions
- the invention relates to devices which ensure partial recycling of exhaust gases in internal combustion engines of vehicles, devices comprising for this purpose a recycling pipe extending between a point in the exhaust pipe of the engine and a point on its intake manifold, a valve mounted on this pipe and means for controlling and adjusting the opening of this valve according to predetermined criteria (temperatures, compositions of certain gases, etc.), means themselves a computer capable of producing electrical control signals as a function of said criteria.
- predetermined criteria temperatures, compositions of certain gases, etc.
- valve is disposed near the intake manifold, that is to say in an area of the engine subjected to less heating than the manifold. exhaust.
- valve control means In known embodiments of these recycling devices, it has been proposed to make the valve control means understand a hydraulic cylinder whose piston is kinematically linked to the recycling valve and biased in one direction by a spring and whose cylinder is divided into two chambers by said piston and a solenoid valve with at least two mounted positions between the outlet of the oil pump and one of said chambers so that, for one of its positions, said chamber is connected to said outlet, which pushes the piston in a first direction against of the spring return force and that, for the other position of the solenoid valve, said chamber is connected to the casing, the spring then urging the piston in the opposite direction to the previous one (patent DE-A-1 963 235) .
- the object of the invention is, above all, to eliminate these various drawbacks.
- the recycling device is essentially characterized in that the solenoid valve comprises four channels connected respectively, the first, to the outlet of the oil pump, the second, to the return of the oil circuit to the casing, the third, to that, of the two chambers of the jack, the maximum filling of which corresponds to the opening maximum of the valve, and the fourth to the other chamber of the jack, and said solenoid valve is arranged in such a way that, for one of its two positions (rest position), the third channel is connected to the second and the fourth , to the first and that for its other position (recycling position), the third channel is connected to the first and the fourth, to the second.
- the jack is associated with a mechanical spring mounted so as to permanently urge the piston towards its position corresponding to the closing of the valve.
- the invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.
- FIGS 1 and 2 schematically show a recycling device established according to the invention, respectively in its two positions of rest and recycling.
- a recycling pipe 5 extending between a point of the exhaust manifold 3 and a point of the manifold intake 2, line fitted with a valve 6 capable of regulating the recycling rate.
- the invention relates more particularly to the manner in which the opening of this valve 6 is automatically controlled and regulated from electrical signals produced by the computer 4.
- this motor 1 is here associated with such a circuit, which comprises a pump 7 for circulation of oil, a casing 8 for collecting this oil and pipe sections 9, 10 and 11 respectively connecting the casing to the pump, the pump to the motor and this motor again to the casing.
- the rod 14 preferably crosses the intake pipe 2, which allows it to be cooled by the cold fuel mixture introduced into the engine.
- This measure may prove to be advantageous given the high temperature of the exhaust gases which are recycled at the level of the valve 6 in the pipe 2.
- This position corresponds to the application of the valve 6 against its seat and therefore to the closing of this valve and to the absence of any recycling of exhaust gas in the engine 1: this is the rest position.
- the piston 13 is therefore biased towards its position (the highest in the drawing) corresponding to the maximum opening of the valve 6, which corresponds to the maximum recycling position.
- This command can be of the all-in-nothing type.
- a spring 19 can be introduced into the chamber P of this variant to ensure the closure of the valve 6, the return force of this spring 19 seconding the hydraulic pressure exerted on the piston 13 for the rest position of the device, or even substituting at this pressure in the event of damage.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
L'invention est relative aux dispositifs qui assurent un recyclage partiel des gaz d'échappement dans les moteurs à combustion interne de véhicules, dispositifs comportant à cet effet une conduite de recyclage s'étendant entre un point de la tubulure d'échappement du moteur et un point de sa tubulure d'admission, un clapet monté sur cette conduite et des moyens pour commander et régler l'ouverture de ce clapet en fonction de critères prédéterminés (températures, compositions de certains gaz...), moyens comprenant eux-mêmes un calculateur propre à élaborer des signaux électriques de commande en fonction desdits critères.The invention relates to devices which ensure partial recycling of exhaust gases in internal combustion engines of vehicles, devices comprising for this purpose a recycling pipe extending between a point in the exhaust pipe of the engine and a point on its intake manifold, a valve mounted on this pipe and means for controlling and adjusting the opening of this valve according to predetermined criteria (temperatures, compositions of certain gases, etc.), means themselves a computer capable of producing electrical control signals as a function of said criteria.
Elle concerne plus spécialement, mais non exclusivement, parmi ces dispositifs, ceux pour lesquels le clapet est disposé à proximité de la tubulure d'admission, c'est-à-dire dans une zone du moteur soumise à un échauffement moins fort que la tubulure d'échappement.More particularly, but not exclusively, among these devices, it relates to those for which the valve is disposed near the intake manifold, that is to say in an area of the engine subjected to less heating than the manifold. exhaust.
Elle vise plus particulièrement ceux, des dispositifs de recyclage du genre en question, qui équipent des moteurs comportant eux-mêmes un circuit de graissage ou lubrification à huile sous pression comprenant essentiellement une pompe de circulation, un carter de collecte et des conduites reliant le carter à la pompe, puis au moteur, et ce dernier de nouveau au carter.It relates more particularly to those recycling devices of the kind in question, which are fitted to engines themselves comprising a lubrication or lubrication circuit under pressure oil comprising essentially a circulation pump, a collection casing and pipes connecting the casing. to the pump, then to the motor, and the latter again to the crankcase.
Dans des modes de réalisation connus de ces dispositifs de recyclage, il a été proposé de faire comprendre aux moyens de commande du clapet un vérin hydraulique dont le piston est lié cinématiquement au clapet de recyclage et sollicité dans un sens par un ressort et dont le cylindre est divisé en deux chambres par ledit piston et une électrovanne à au moins deux positions montée entre la sortie de la pompe à huile et l'une desdites chambres de façon telle que, pour l'une de ses positions, ladite chambre soit reliée à ladite sortie, ce qui repousse le piston dans un premier sens à l'encontre de l'effort de rappel du ressort et que, pour l'autre position de l'électrovanne, ladite chambre soit reliée au carter, le ressort sollicitant alors le piston dans le sens inverse du précédent (brevet DE-A-1 963 235).In known embodiments of these recycling devices, it has been proposed to make the valve control means understand a hydraulic cylinder whose piston is kinematically linked to the recycling valve and biased in one direction by a spring and whose cylinder is divided into two chambers by said piston and a solenoid valve with at least two mounted positions between the outlet of the oil pump and one of said chambers so that, for one of its positions, said chamber is connected to said outlet, which pushes the piston in a first direction against of the spring return force and that, for the other position of the solenoid valve, said chamber is connected to the casing, the spring then urging the piston in the opposite direction to the previous one (patent DE-A-1 963 235) .
Ces modes de réalisation présentent un certain nombre d'inconvénients et en particulier les suivants :
- le sens dans lequel le ressort sollicite le piston est celui correspondant à l'ouverture du clapet : si donc une panne intervient sur le circuit de commande hydraulique, le clapet est automatiquement ouvert au maximum, ce qui doit être évité car, si l'on admet un recyclage partiel de gaz d'échappement dans certaines conditions de fonctionnement du moteur, il est nocif d'assurer un tel recyclage en permanence, et en particulier à son degré maximum,
- la commande du clapet est assurée dans un sens par la seule détente du ressort, ce qui peut être trop faible et trop lent dans certaines conditions de fonctionnement, en particulier lors des démarrages, alors que l'huile est encore froide et donc relativement visqueuse, la durée d'une telle commande pouvant alors atteindre et même dépasser la seconde.
- the direction in which the spring biases the piston is that corresponding to the opening of the valve: if therefore a fault occurs on the hydraulic control circuit, the valve is automatically opened to the maximum, which must be avoided because, if we admits partial recycling of exhaust gases under certain engine operating conditions, it is harmful to ensure such recycling constantly, and in particular to its maximum degree,
- the control of the valve is ensured in one direction by the mere relaxation of the spring, which can be too weak and too slow under certain operating conditions, in particular during start-ups, while the oil is still cold and therefore relatively viscous, the duration of such an order can then reach and even exceed the second.
L'invention a pour but, surtout, de supprimer ces différents inconvénients.The object of the invention is, above all, to eliminate these various drawbacks.
A cet effet, le dispositif de recyclage selon l'invention est essentiellement caractérisé en ce que l'électrovanne comprend quatre voies reliées respectivement, la première, à la sortie de la pompe à huile, la deuxième, au retour du circuit d'huile vers le carter, la troisième, à celle, des deux chambres du vérin, dont le remplissage maximum correspond à l'ouverture maximum du clapet, et la quatrième à l'autre chambre du vérin, et ladite électrovanne est agencée de façon telle que, pour l'une de ses deux positions (position de repos), la troisième voie soit reliée à la seconde et la quatrième, à la première et que pour son autre position (position de recyclage), la troisième voie soit reliée à la première et la quatrième, à la deuxième.To this end, the recycling device according to the invention is essentially characterized in that the solenoid valve comprises four channels connected respectively, the first, to the outlet of the oil pump, the second, to the return of the oil circuit to the casing, the third, to that, of the two chambers of the jack, the maximum filling of which corresponds to the opening maximum of the valve, and the fourth to the other chamber of the jack, and said solenoid valve is arranged in such a way that, for one of its two positions (rest position), the third channel is connected to the second and the fourth , to the first and that for its other position (recycling position), the third channel is connected to the first and the fourth, to the second.
Dans des modes de réalisation préférés, en outre, le vérin est associé à un ressort mécanique monté de façon à solliciter en permanence le piston vers sa position correspondant à la fermeture du clapet.In preferred embodiments, in addition, the jack is associated with a mechanical spring mounted so as to permanently urge the piston towards its position corresponding to the closing of the valve.
L'invention comprend, mises à part ces dispositions principales, certaines autres dispositions qui s'utilisent de préférence en même temps et dont il sera plus explicitement question ci-après.The invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.
Dans ce qui suit, l'on va décrire un mode de réalisation préféré de l'invention en se référant au dessin ci-annexé d'une manière bien entendu non limitative.In what follows, a preferred embodiment of the invention will be described with reference to the accompanying drawing, of course in a non-limiting manner.
Les figures 1 et 2, de ce dessin, montrent schématiquement un dispositif de recyclage établi selon l'invention, respectivement en ses deux positions de repos et de recyclage.Figures 1 and 2, of this drawing, schematically show a recycling device established according to the invention, respectively in its two positions of rest and recycling.
Il s'agit d'assurer, dans un moteur à combustion interne 1, notamment du type Diesel, comprenant une tubulure 2 d'admission d'air et une tubulure 3 d'échappement des gaz brûlés, un recyclage partiel de ces gaz, recyclage dont l'importance relative à chaque instant est déterminée par un calculteur 4 en fonction de certains critères connus de l'homme de métier (en particulier certaines températures, teneurs en certains composants des gaz d'échappement et/ou des mélanges gazeux admis...).This involves ensuring, in an
A cet effet, comme bien connu, il est prévu une conduite de recyclage 5 s'étendant entre un point de la tubulure d'échappement 3 et un point de la tubulure d'admission 2, conduite équipée d'un clapet ou valve 6 propre à régler le débit du recyclage.For this purpose, as is well known, there is provided a
L'invention concerne plus particulièrement la manière dont est automatiquement commandée et réglée l'ouverture de ce clapet 6 à partir de signaux électriques élaborés par le calculateur 4.The invention relates more particularly to the manner in which the opening of this valve 6 is automatically controlled and regulated from electrical signals produced by the
Au lieu que cette commande et ce réglage fassent appel à des moyens pneumatiques asservis à des dépressions, comme c'est en général le cas, on fait appel ici à l'énergie hydraulique développée par de l'huile sous pression dans un circuit de graissage du moteur 1.Instead of this command and this adjustment making use of pneumatic means controlled by depressions, as is generally the case, use is made here of hydraulic energy developed by oil under pressure in a lubrication circuit.
En effet ce moteur 1 est ici associé à un tel circuit, qui comprend une pompe 7 de circulation d'huile, un carter 8 de collecte pour cette huile et des tronçons de conduite 9, 10 et 11 reliant respectivement le carter à la pompe, la pompe au moteur et ce moteur à nouveau au carter.Indeed, this
Pour exploiter l'énergie hydraulique de ce circuit de graissage, on a recours :
- d'une part, à un vérin hydraulique V composé d'un
cylindre 12 etd'un piston 13 dont latige 14 est liée cinématiquement au clapet 6, - et, d'autre part, à une électrovanne E comprenant quatre voies A, B, C et D.
- on the one hand, to a hydraulic cylinder V composed of a
cylinder 12 and apiston 13, therod 14 of which is kinematically linked to the valve 6, - and, on the other hand, to a solenoid valve E comprising four channels A, B, C and D.
Ces quatre voies sont reliées respectivement :
- la voie A, par un
conduit 15, au tronçon deconduite 10, - la voie B, par un
conduit 16, au tronçon deconduite 11, - la voie C, par un
conduit 17, à celle M, des deux chambres M et P du vérin V, dont le remplissage maximum correspond à l'ouverture maximum du clapet 6, - et la voie D, par un
conduit 18, à l'autre chambre P du vérin V.
- track A, via a
pipe 15, to thepipe section 10, - track B, via a
pipe 16, to thepipe section 11, - track C, via a
conduit 17, to that M, of the two chambers M and P of the jack V, the maximum filling of which corresponds to the maximum opening of the valve 6, - and channel D, via a
conduit 18, to the other chamber P of the jack V.
Comme visible sur les dessins, la tige 14 traverse de préférence la conduite d'admission 2, ce qui permet de la refroidir par le mélange combustible froid introduit dans le moteur.As can be seen in the drawings, the
Cette mesure peut se révéler avantageuse étant donné la haute température des gaz d'échappement qui sont recyclés au niveau du clapet 6 dans la conduite 2.This measure may prove to be advantageous given the high temperature of the exhaust gases which are recycled at the level of the valve 6 in the
L'électrovanne E est agencée de façon à occuper l'une ou l'autre de deux positions, savoir :
- une première position pour laquelle les deux voies A et D sont mises en communication, ainsi que les deux voies B et C (figure 1),
- et une seconde position pour laquelle la communication est établie entre les deux voies A et C et entre les deux voies B et D (figure 2).
- a first position for which the two channels A and D are put in communication, as well as the two channels B and C (FIG. 1),
- and a second position for which communication is established between the two channels A and C and between the two channels B and D (FIG. 2).
Pour la première position ci-dessus définie de l'électrovanne E, représentée sur la figure 1, les liaisons signalées ont pour effet d'appliquer la pression de l'huile refoulée par la pompe 7 dans la chambre P du vérin et au contraire d'évacuer l'huile contenue dans la chambre M de ce vérin vers le carter 8.For the first position defined above of the solenoid valve E, represented in FIG. 1, the connections indicated have the effect of applying the pressure of the oil discharged by the pump 7 into the chamber P of the jack and, on the contrary, d '' evacuate the oil contained in the chamber M of this jack towards the
Cette position correspond à l'application du clapet 6 contre son siège et donc à la fermeture de ce clapet et à l'absence de tout recyclage de gaz d'échappement dans le moteur 1 : c'est la position de repos.This position corresponds to the application of the valve 6 against its seat and therefore to the closing of this valve and to the absence of any recycling of exhaust gas in the engine 1: this is the rest position.
Au contraire, pour la seconde position de l'électrovanne E représentée sur la figure 2, c'est la chambre P qui est reliée à la décharge dans le carter 8 et la chambre M qui est reliée à la sortie de la pompe 7 et donc remplie d'huile sous pression : le piston 13 est donc alors sollicité vers sa position (la plus haute sur le dessin) correspondant à l'ouverture maximum du clapet 6, ce qui correspond à la position de recyclage maximum.On the contrary, for the second position of the solenoid valve E shown in FIG. 2, it is the chamber P which is connected to the discharge in the
Les passages de l'électrovanne E de sa position de repos à sa position de recyclage et inversement sont commandés par les signaux électriques élaborés par le calculateur 4.The passages of the solenoid valve E from its rest position to its recycling position and vice versa are controlled by the electrical signals produced by the
Cette commande peut être du type tout au rien.This command can be of the all-in-nothing type.
Elle peut également être d'un type progressif, les signaux électriques se présentant alors notamment sous la forme de suites régulières d'impulsions dont les largeurs sont d'autant plus grandes que la proportion de gaz d'échappement à recycler est plus élevée, l'électrovanne E étant placée en sa position de recyclage pendant toute la durée desdites impulsions et au contraire en sa position de repos pendant les intervalles compris entre les impulsions successives.It can also be of a progressive type, the electrical signals then being presented in particular in the form of regular sequences of pulses whose widths are all the greater the higher the proportion of exhaust gas to be recycled, l solenoid valve E being placed in its recycling position for the duration of said pulses and on the contrary in its rest position during the intervals between the successive pulses.
Un ressort 19 peut être introduit dans la chambre P de cette variante pour assurer la fermeture du clapet 6, l'effort de rappel de ce ressort 19 secondant la pression hydraulique exercée sur le piston 13 pour la position de repos du dispositif, voire se substituant à cette pression en cas d'avarie.A spring 19 can be introduced into the chamber P of this variant to ensure the closure of the valve 6, the return force of this spring 19 seconding the hydraulic pressure exerted on the
En suite de quoi et quel que soit le mode de réalisation adopté, on obtient un dispositif de recyclage de gaz d'échappement dont la constitution et le fonctionnement résultent suffisamment de ce qui précède.As a result of what and whatever the embodiment adopted, an exhaust gas recycling device is obtained, the constitution and operation of which result sufficiently from the above.
Ce dispositif présente de nombreux avantages par rapport à ceux antérieurement connus et en particulier les suivants :
- il permet d'exploiter une énergie déjà disponible sur le véhicule sous la forme d'une circulation d'huile sous pression, et donc d'éviter la nécessité de recourir à une source d'énergie indépendante telle qu'une source de dépression ou vide, comme il est usuel dans ce domaine,
- la commande des ouvertures et fermetures du clapet 6, qui peuvent exiger un certain effort en raison des pressions de gaz mises en jeu au voisinage immédiat de ce clapet, se ramène en définitive à la commande de simples déplacements, en général purement rectilignes ou purement angulaires, de l'organe mobile de l'électrovanne à quatre voies E, déplacements qui requièrent des efforts de commande tout à fait négligeables et qui peuvent donc se succéder dans le temps à une cadence très élevée, rendant possibles entre autres des réglages progressifs et continus extrêmement précis du recyclage : les commandes très rapides en question du clapet 6 sont rendues possibles par le fait qu'elles sont assurées dans les deux sens par de l'huile sous pression, et non uniquement par la détente d'un ressort pour l'un de ces deux sens,
- dans le mode de réalisation préféré comprenant le ressort 19, le clapet 6 est automatiquement placé en sa position de fermeture en cas d'avarie du circuit électrique et/ou hydraulique de commande.
- it makes it possible to use energy already available on the vehicle in the form of a pressurized oil circulation, and therefore to avoid the need to resort to an independent energy source such as a vacuum or vacuum source , as is usual in this area,
- the control of the openings and closings of the valve 6, which may require a certain effort due to the gas pressures brought into play in the immediate vicinity of this valve, is ultimately reduced to the control of simple movements, generally purely rectilinear or purely angular , of the movable member of the four-way solenoid valve E, displacements which require completely negligible control forces which can therefore succeed one another over time at a very high rate, making possible, among other things, extremely precise progressive and continuous adjustments of the recycling: the very rapid commands in question of the valve 6 are made possible by the the fact that they are provided in both directions by pressurized oil, and not only by the relaxation of a spring for one of these two directions,
- in the preferred embodiment comprising the spring 19, the valve 6 is automatically placed in its closed position in the event of damage to the electrical and / or hydraulic control circuit.
Claims (2)
- Device for recycling the exhaust gases from an internal combustion engine (1), including a recycling pipe (5) which extends between the exhaust manifold (3) and inlet manifold (2), a valve (6) mounted on this pipe, and means, comprising a computer (4), for controlling and regulating the opening of this valve, the said engine having a pressurised oil lubrication system itself comprising a circulation pump (7), a collecting sump (8) and pipes (9, 10, 11) respectively connecting the sump to the pump, then to the engine, and the latter once again to the sump, the means for controlling the valve comprising a hydraulic actuator (V), the piston (13) of which is connected kinematically to the recycling valve (6) and the cylinder (12) of which is divided into two chambers (M, P) by the said piston, and a solenoid valve (E) with at least two positions mounted between the outlet from the oil pump and one of the said chambers, characterised in that the said solenoid valve (E) comprises four ways connected respectively, the first (A) to the outlet from the oil pump (7), the second (B) to the oil system return to the sump (8), the third (C) to one (M) of the two chambers in the actuator (V), the maximum filling of which corresponds to the maximum opening of the valve (6), and the fourth (D) to the other chamber (P) of the actuator, and in that the said solenoid valve is arranged so that, for one of its two positions, ie the position of rest, the third way is connected to the second and the fourth to the first, and so that, for its other position, ie the recycling position, the third way is connected to the first and the fourth to the second.
- Recycling device according to Claim 1, characterised in that the actuator (V) is associated with a mechanical spring (19) mounted so as to push the piston (13) permanently towards its position corresponding to the closing of the valve (6).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9100963 | 1991-01-29 | ||
| FR9100963A FR2672085B1 (en) | 1991-01-29 | 1991-01-29 | IMPROVEMENTS TO EXHAUST GAS RECYCLING DEVICES. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0497677A1 EP0497677A1 (en) | 1992-08-05 |
| EP0497677B1 true EP0497677B1 (en) | 1994-01-12 |
Family
ID=9409137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92400202A Expired - Lifetime EP0497677B1 (en) | 1991-01-29 | 1992-01-27 | Improvements for exhaust gas recirculation devices |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0497677B1 (en) |
| DE (1) | DE69200036T2 (en) |
| ES (1) | ES2048021T3 (en) |
| FR (1) | FR2672085B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121827B (en) * | 2016-06-28 | 2018-01-02 | 中国南方航空工业(集团)有限公司 | The oil system of engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1963235A1 (en) * | 1969-12-17 | 1971-06-24 | Motoren Werke Mannheim Ag | Internal combustion engine, in particular self-igniting air-compressing internal combustion engine for operation with fuels unwilling to burn |
| US3868868A (en) * | 1973-10-05 | 1975-03-04 | Gen Motors Corp | Transmission controlled emission control system |
| US4020809A (en) * | 1975-06-02 | 1977-05-03 | Caterpillar Tractor Co. | Exhaust gas recirculation system for a diesel engine |
-
1991
- 1991-01-29 FR FR9100963A patent/FR2672085B1/en not_active Expired - Fee Related
-
1992
- 1992-01-27 DE DE69200036T patent/DE69200036T2/en not_active Expired - Fee Related
- 1992-01-27 ES ES92400202T patent/ES2048021T3/en not_active Expired - Lifetime
- 1992-01-27 EP EP92400202A patent/EP0497677B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69200036T2 (en) | 1994-07-07 |
| ES2048021T3 (en) | 1994-03-01 |
| EP0497677A1 (en) | 1992-08-05 |
| FR2672085B1 (en) | 1993-05-14 |
| FR2672085A1 (en) | 1992-07-31 |
| DE69200036D1 (en) | 1994-02-24 |
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