EP1921301B1 - Exhaust gas feedback assembly - Google Patents
Exhaust gas feedback assembly Download PDFInfo
- Publication number
- EP1921301B1 EP1921301B1 EP07019452.7A EP07019452A EP1921301B1 EP 1921301 B1 EP1921301 B1 EP 1921301B1 EP 07019452 A EP07019452 A EP 07019452A EP 1921301 B1 EP1921301 B1 EP 1921301B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- exhaust gas
- valve body
- radiator
- inlet
- valve
- 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.)
- Not-in-force
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- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 6
- 239000007789 gas Substances 0.000 description 35
- 238000001816 cooling Methods 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Images
Classifications
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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
- F02M26/65—Constructional details of EGR valves
- F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
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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
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/25—Layout, e.g. schematics with coolers having bypasses
- F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
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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
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
Definitions
- the invention relates to an exhaust gas recirculation arrangement with the features of patent claim 1.
- Exhaust gas recirculation (EGR) with electromotive, continuously variable flow control is mandatory to meet current and future emission standards for direct injection gasoline and diesel engines.
- EGR exhaust gas recirculation
- part of the burned exhaust gas is taken from the exhaust manifold and fed back to the intake mixture via a pipe on the intake manifold.
- EGR valve With an electronically actuated EGR valve, the EGR rate is continuously adjusted to the demand calculated by the engine control with the required dynamics. In this way, a portion of the exhaust gas is burned twice and the desired effects for reducing NOx emissions are achieved.
- Diesel engines require due to the much higher recirculation rates and the associated higher temperatures of Ansauggemisches additionally a liquid-air heat exchanger to reduce the exhaust gas temperature of about 450 ° C to 150 ° C to 200 ° C.
- Such EGR coolers have a pneumatic bypass flap, with which the cooler in the Cold operation can be switched off. In this way it is ensured that the exhaust gas temperature necessary for the full function in the catalytic converter and in a soot particle filter is reached as quickly as possible after the cold start of the engine. It is known to manufacture the cooler and the bypass flap made of stainless steel and to combine it into a structural unit. In addition, however, a valve for regulating the amount of exhaust gas required to be placed either in front of or behind the radiator is required.
- a rotary flap valve is used with a rotatable valve plate mounted on an axle, which can be swiveled by a maximum of 90 °.
- the second type of valve is a plunger valve, in which via a translational stroke of the plunger, a lift height corresponding cross section in the exhaust pipe is released to the exhaust gas flow.
- the EP 1363013A1 shows an example of an EGR arrangement wherein the bypass and quantity control are combined in one actuator.
- the present invention seeks to combine the functions of a cooler bypass setting and the function of volume control in space-saving manner in a combined actuator.
- a cooler which is coupled to a valve housing, which has in known manner an inlet channel and an outlet channel for the exhaust gas to be supplied to and removed from the cooler.
- a driven by an actuator valve body is arranged, which serves on the one hand to change the flow rate of the exhaust gas in the radiator, on the other hand, but also takes over the bypass control. Through this valve body can be determined whether the exhaust gas should flow through the radiator or not.
- valve body is a piston displaceable linearly within a valve housing, through which the interior of the valve housing is divided into an inlet chamber and an outlet chamber, wherein the cooler inlet is connected to the inlet chamber of the radiator inlet and to the outlet chamber.
- the essential feature of this arrangement is the orientation of the inlet channel, which opens transversely to the stroke direction of the valve body in the interior and thereby at least partially from a peripheral lateral surface of the valve body, i. also completely lockable.
- the inlet channel is therefore not closed as usual by the piston surface, but by the piston skirt surface.
- the Kolbenober- and -unterseite are respectively facing the inlet and outlet chamber, so that they are fluid-tightly sealed against each other.
- the inlet chamber can be made smaller and at the same time the outlet chamber can be enlarged.
- the outlet chamber can also be made smaller and the inlet chamber can be enlarged at the same time. Since the inlet channel is at least partially released by a displacement of the valve body, exhaust gas flows either into the inlet chamber or directly into the outlet chamber, bypassing the radiator.
- the special feature is that over a partial coverage of the inlet channel not only the deflection direction the exhaust gas within the valve housing, but also the amount of exhaust gas can be controlled.
- the EGR assembly may be made of stainless steel or e.g. made of cast steel and is therefore heat resistant executable, as a valve body made of aluminum. Since the coolers are usually made of stainless steel, the same materials can be used for the radiator and arranged on the radiator valve unit. Another advantage is that the actuator in the form of an electric actuator can be attached directly to the valve housing. The actuator can be integrated directly into a cover that covers the inlet chamber of the valve body.
- valve body In principle, it is possible within the scope of the invention to make the interior of the valve housing non-circular. However, it is considered expedient to design the piston-shaped valve body cylindrical, as well as cylindrical sealant are used in this way.
- the valve body should have an upper and a lower seal, which are arranged at a distance from one another which is greater than the diameter or the height of the inlet channel measured in the stroke direction. In this way it is possible to position the area of the valve body lying between the seals in such a way that the inlet channel is completely blocked. In any case, however, it is ensured that exhaust gases can not pass directly from the inlet chamber to the outlet chamber or directly from the outlet chamber to the inlet chamber, bypassing the radiator.
- the intake passage is wider than high, with the height of the intake passage being measured in the lift direction.
- the inlet channel may e.g. be configured slot-shaped and thereby distribute over a larger segment of the housing. In this way it is possible to use in a very space-saving design valve body with low height, thereby saving space and weight.
- the amount of exhaust gas flowing into the valve housing is regulated by the position of the valve body.
- the inlet channel is arranged at an angle between 60 ° and 90 ° to the stroke direction.
- the thickness of the valve body or of the piston is dimensioned so that it completely releases the cross-section of the inlet channel in the bypass position, in which exhaust gas flows directly into the outlet chamber.
- the valve body should be positionable so that the inlet channel is completely free.
- the inlet channel is therefore advantageously arranged centrally between the radiator inlet and the radiator outlet, wherein the inlet duct is preferably arranged opposite the radiator inlet and the radiator outlet for flow-related and design reasons.
- FIG. 1 is the basic structure of the EGR arrangement 1 according to the invention to recognize, consisting of a cooler 2 and a valve housing 3 with an actuator. 4
- the valve housing 3 is cylindrical or has a cylindrically shaped interior 5, which is divided into an inlet chamber 6 above and an outlet chamber 8 below the piston-shaped valve body 7. Via a slot-shaped inlet channel 9, as in FIG. 1 5, exhaust gas is fed to the interior 5 of the valve housing 3 at medium height, which is supplied to either the inlet chamber 6 or the outlet chamber 8, depending on the position of the valve body 7. From the inlet chamber 6, the exhaust gas passes through a radiator inlet 10 into the interior of the radiator 2, where it is diverted in a U-shape and fed to a radiator outlet 11 which opens below the piston-shaped valve body 7 into the outlet chamber 8.
- the outlet chamber 8 is connected to the end face of the cylindrical interior 5 with an outlet channel 12, via which the exhaust gas can again emerge from the valve housing 3.
- Plotted arrows are the basic flow paths of the exhaust gas within the EGR arrangement recognizable.
- FIG. 3 is the valve body 7 at its bottom in the image plane dead center and is therefore extended maximum. In this position, exhaust gas can flow in via the inlet channel 9 exclusively into the inlet chamber 6 and is thus completely fed to the radiator 2.
- the valve body 7 is thus in a cooling position.
- valve body 7 In FIG. 4 the valve body 7 is in its top dead center in the image plane, so that the radiator inlet 10 is blocked and the inlet channel 9 opens into the outlet chamber 8, so that the exhaust gas is supplied directly to the outlet channel 12 according to the arrows shown.
- the radiator 2 is completely bypassed in this position of the valve body 7. Basically, intermediate positions between the bypass position and the cooling position in the FIGS. 3 and 4 possible.
- the valve body 7 is dimensioned such that its lateral surface 13 completely covers the mouth of the inlet channel 9 and seals by means of an upper and lower seal 14, 15 in each case opposite the inlet chamber 6 and the outlet chamber 7 (FIG. FIG. 2 ).
- valve body 7 If the valve body 7 is displaced upwards only slightly from this central position, a partial region of the inlet channel 9 is released, so that a small amount of exhaust gas can be supplied to the outlet chamber 8. In this way, not only the exhaust gas direction, but also the amount of exhaust gas can be controlled with a single valve body 7. In addition, only a single actuator 4 is required, which drives a piston rod 16 which passes through the inlet chamber 6. Conversely, via a slight deflection of the valve body 7 down a metered amount of exhaust gas can be supplied to the radiator 2.
- Decisive in the exhaust gas recirculation arrangement is that the inlet channel 9 is arranged transversely to the stroke direction H in the central region between the radiator inlet 10 and the radiator outlet 11.
- the intake passage 9 is slightly inclined to the moving axis of the valve body 7. In this way, the amount of exhaust gas can be better dosed.
- FIG. 6 An exemplary representation of the opening cross-section of the inlet channel plotted against the position of the valve body (piston stroke) can be found in FIG. 6 .
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Multiple-Way Valves (AREA)
- Fluid-Driven Valves (AREA)
Description
Die Erfindung betrifft eine Abgasrückführungsanordnung mit den Merkmalen des Patentanspruchs 1.The invention relates to an exhaust gas recirculation arrangement with the features of
Eine Abgasrückführung (AGR) mit einer elektromotorischen, stufenlos geregelten Durchflussregulierung ist zum Erreichen der derzeitigen und zukünftigen Abgasnormen bei direkt einspritzenden Otto- und Dieselmotoren zwingend erforderlich. Bei der Abgasrückführung wird ein Teil des verbrannten Abgases am Auspuffkrümmer entnommen und dem Ansauggemisch über eine Rohrleitung am Ansaugkrümmer wieder zugeführt. Mit einem elektronisch betätigten AGR-Ventil wird die AGR-Rate stufenlos an den von der Motorsteuerung errechneten Bedarf mit der geforderten Dynamik angepasst. Auf diese Weise wird ein Teil des Abgases zweimal verbrannt und es werden die gewünschten Effekte zur Reduzierung der NOx-Emissionen erreicht.Exhaust gas recirculation (EGR) with electromotive, continuously variable flow control is mandatory to meet current and future emission standards for direct injection gasoline and diesel engines. In the exhaust gas recirculation part of the burned exhaust gas is taken from the exhaust manifold and fed back to the intake mixture via a pipe on the intake manifold. With an electronically actuated EGR valve, the EGR rate is continuously adjusted to the demand calculated by the engine control with the required dynamics. In this way, a portion of the exhaust gas is burned twice and the desired effects for reducing NOx emissions are achieved.
Dieselmotoren benötigen aufgrund der deutlich höheren Rückführungsraten und den damit verbundenen höheren Temperaturen des Ansauggemisches zusätzlich einen Flüssigkeits-Luft-Wärmetauscher, um die Abgastemperatur von ca. 450 °C auf 150°C bis 200 °C zu senken. Derartige AGR-Kühler verfügen über eine pneumatische Bypassklappe, mit der der Kühler im Kaltbetrieb ausgeschaltet werden kann. Auf diese Weise wird gewährleistet, dass die für die volle Funktion notwendige Abgastemperatur im Katalysator und in einem Russpartikelfilter nach dem Kaltstart des Motors schnellstmöglich erreicht wird. Es ist bekannt, den Kühler und die Bypassklappe aus Edelstahl zu fertigen und zu einer Baueinheit zu kombinieren. Zusätzlich ist jedoch ein Ventil zur Mengenregulierung des Abgases erforderlich, das entweder vor oder hinter dem Kühler angeordnet wird.Diesel engines require due to the much higher recirculation rates and the associated higher temperatures of Ansauggemisches additionally a liquid-air heat exchanger to reduce the exhaust gas temperature of about 450 ° C to 150 ° C to 200 ° C. Such EGR coolers have a pneumatic bypass flap, with which the cooler in the Cold operation can be switched off. In this way it is ensured that the exhaust gas temperature necessary for the full function in the catalytic converter and in a soot particle filter is reached as quickly as possible after the cold start of the engine. It is known to manufacture the cooler and the bypass flap made of stainless steel and to combine it into a structural unit. In addition, however, a valve for regulating the amount of exhaust gas required to be placed either in front of or behind the radiator is required.
Derzeit werden hauptsächlich zwei Arten von elektrisch betriebenen Ventilen verwendet. Zum einen kommt ein rotatorisches Klappenventil zum Einsatz mit einem auf einer Achse gelagerten, drehbaren Ventilteller, der um maximal 90° geschwenkt werden kann. Die zweite Art eines Ventils ist ein Stößelventil, bei welchem über eine translatorische Hubbewegung des Stößels ein der Hubhöhe entsprechender Querschnitt im Abgasrohr zur Abgasdurchströmung freigegeben wird.Currently, mainly two types of electrically operated valves are used. On the one hand, a rotary flap valve is used with a rotatable valve plate mounted on an axle, which can be swiveled by a maximum of 90 °. The second type of valve is a plunger valve, in which via a translational stroke of the plunger, a lift height corresponding cross section in the exhaust pipe is released to the exhaust gas flow.
Nachteilig bei den bekannten Ventilanordnungen ist, dass zum einen ein Stellelement vorgesehen sein muss, um beispielsweise eine Bypassklappe in die gewünschte Position zu bringen. Zusätzlich ist jedoch ein zweites Ventil zur Mengenregulierung des Abgases erforderlich. Diese zwei getrennten Baugruppen müssen unabhängig voneinander angesteuert werden, was viele bewegliche Teile und eine entsprechende Anzahl von Lagerstellen für die Ventilkörper erforderlich macht. Hinzu kommt der erhöhte Bauraumbedarf durch zwei voneinander unabhängige Aktuatoren, nämlich einer Unterdruckdose für die Bypassklappe und einem elektrischen, stufenlosen Versteller für das Ventil zur Mengenregulierung des Abgasstroms.A disadvantage of the known valve arrangements, that on the one hand, an adjusting element must be provided to bring, for example, a bypass valve in the desired position. In addition, however, a second valve for volume control of the exhaust gas is required. These two separate assemblies must be controlled independently of each other, which requires many moving parts and a corresponding number of bearings for the valve body. In addition, the increased space requirement by two independent actuators, namely a vacuum box for the bypass valve and an electric, stepless stage for the valve to regulate the volume of the exhaust stream.
Die
Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, die Funktionen einer Kühlerbypasseinstellung und die Funktion der Mengenregulierung in bauraumsparender Weise in einem kombinierten Stellelement zu vereinen.Proceeding from this, the present invention seeks to combine the functions of a cooler bypass setting and the function of volume control in space-saving manner in a combined actuator.
Diese Aufgabe ist bei einer Abgasrückführungsanordnung (AGR-Anordnung) mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved with an exhaust gas recirculation arrangement (EGR arrangement) having the features of
Vorteilhafte Weiterbildungen des Erfindungsgedankens sind Gegenstand der Unteransprüche.Advantageous developments of the inventive concept are the subject of the dependent claims.
Bei der erfindungsgemäßen AGR-Anordnung ist ein Kühler vorgesehen, der mit einem Ventilgehäuse gekoppelt ist, welches in bekannter Weise einen Einlasskanal und einen Auslasskanal für das dem Kühler zu- und abzuleitende Abgas aufweist. Im Ventilgehäuse ist ein von einem Stellantrieb angetriebener Ventilkörper angeordnet, der einerseits zur Veränderung der Durchflussmenge des Abgases im Kühler dient, andererseits aber auch die Bypassregelung übernimmt. Durch diesen Ventilkörper kann festgelegt werden, ob das Abgas durch den Kühler strömen soll oder nicht.In the EGR arrangement according to the invention, a cooler is provided, which is coupled to a valve housing, which has in known manner an inlet channel and an outlet channel for the exhaust gas to be supplied to and removed from the cooler. In the valve housing a driven by an actuator valve body is arranged, which serves on the one hand to change the flow rate of the exhaust gas in the radiator, on the other hand, but also takes over the bypass control. Through this valve body can be determined whether the exhaust gas should flow through the radiator or not.
Es ist weiterhin vorgesehen, dass der Ventilkörper ein linear innerhalb eines Ventilgehäuses verschiebbarer Kolben ist, durch welchen der Innenraum des Ventilgehäuses in eine Einlasskammer und eine Auslasskammer unterteilt ist, wobei an die Einlasskammer der Kühlereinlass und an die Auslasskammer der Kühlerauslass angeschlossen ist. Das wesentliche bei dieser Anordnung ist die Orientierung des Einlasskanals, der quer zur Hubrichtung des Ventilkörpers in den Innenraum mündet und dadurch von einer umfangsseitigen Mantelfläche des Ventilkörpers zumindest teilweise, d.h. auch vollständig sperrbar ist. Der Einlasskanal wird also nicht wie üblicherweise von der Kolbenoberfläche verschlossen, sondern von der Kolbenmantelfläche.It is further provided that the valve body is a piston displaceable linearly within a valve housing, through which the interior of the valve housing is divided into an inlet chamber and an outlet chamber, wherein the cooler inlet is connected to the inlet chamber of the radiator inlet and to the outlet chamber. The essential feature of this arrangement is the orientation of the inlet channel, which opens transversely to the stroke direction of the valve body in the interior and thereby at least partially from a peripheral lateral surface of the valve body, i. also completely lockable. The inlet channel is therefore not closed as usual by the piston surface, but by the piston skirt surface.
Die Kolbenober- und -unterseite sind jeweils der Einlass- bzw. Auslasskammer zugewandt, so dass diese fluiddicht gegeneinander abgedichtet sind. Je nach Stellung des Ventilkörpers kann die Einlasskammer verkleinert und zeitgleich die Auslasskammer vergrößert werden. Umgekehrt kann auch die Auslasskammer verkleinert und gleichzeitig die Einlasskammer vergrößert werden. Da durch eine Verlagerung des Ventilkörpers der Einlasskanal zumindest teilweise freigegeben wird, strömt Abgas entweder in die Einlasskammer oder unmittelbar unter Umgehung des Kühlers in die Auslasskammer. Das besondere ist, dass über eine teilweise Bedeckung des Einlasskanals nicht nur die Auslenkungsrichtung des Abgases innerhalb des Ventilgehäuses, sondern zudem die Menge des Abgases geregelt werden kann.The Kolbenober- and -unterseite are respectively facing the inlet and outlet chamber, so that they are fluid-tightly sealed against each other. Depending on the position of the valve body, the inlet chamber can be made smaller and at the same time the outlet chamber can be enlarged. Conversely, the outlet chamber can also be made smaller and the inlet chamber can be enlarged at the same time. Since the inlet channel is at least partially released by a displacement of the valve body, exhaust gas flows either into the inlet chamber or directly into the outlet chamber, bypassing the radiator. The special feature is that over a partial coverage of the inlet channel not only the deflection direction the exhaust gas within the valve housing, but also the amount of exhaust gas can be controlled.
Auf diese Weise ist im Rahmen der Erfindung nur ein einziges Stellelement erforderlich, das entsprechend wenig Lagerstellen benötigt, ein geringeres Gewicht hat und zudem weniger Bauraum benötigt als zwei separate Ventilanordnungen einschließlich der zugehörigen Stellantriebe und deren Steuerung. Die erfindungsgemäße AGR-Anordnung ist auch bei einer eventuell später notwendigen Kühlung der Abgasrückführung in einem Ottomotor verwendbar.In this way, in the context of the invention, only a single actuator is required, which requires a correspondingly few bearings, has a lower weight and also requires less space than two separate valve assemblies including the associated actuators and their control. The EGR arrangement according to the invention can also be used in the case of possibly necessary cooling of the exhaust gas recirculation in a gasoline engine.
Die AGR-Anordnung kann aus Edelstahl oder z.B. aus Gussstahl gefertigt sein und ist daher hitzebeständiger ausführbar, als Ventilgehäuse aus Aluminium. Da auch die Kühler in der Regel aus Edelstahl bestehen, können für den Kühler und die an dem Kühler angeordnete Ventileinheit gleiche Materialien verwendet werden. Als weiterer Vorteil ist zu nennen, dass der Stellantrieb in Form eines elektrischen Aktuators unmittelbar an dem Ventilgehäuse befestigt sein kann. Der Stellantrieb kann direkt in einen Deckel integriert werden, der die Einlasskammer des Ventilgehäuses bedeckt.The EGR assembly may be made of stainless steel or e.g. made of cast steel and is therefore heat resistant executable, as a valve body made of aluminum. Since the coolers are usually made of stainless steel, the same materials can be used for the radiator and arranged on the radiator valve unit. Another advantage is that the actuator in the form of an electric actuator can be attached directly to the valve housing. The actuator can be integrated directly into a cover that covers the inlet chamber of the valve body.
Grundsätzlich ist es im Rahmen der Erfindung möglich, den Innenraum des Ventilgehäuses unrund zu gestalten. Es wird jedoch als zweckmäßig angesehen, den kolbenförmigen Ventilkörper zylindrisch auszugestalten, da auf diese Weise auch zylindrische Dichtmittel zum Einsatz kommen. Grundsätzlich soll der Ventilkörper eine obere und eine untere Dichtung aufweisen, die in einem Abstand zueinander angeordnet sind, der größer ist als der Durchmesser bzw. die in Hubrichtung gemessene Höhe des Einlasskanals. Auf diese Weise ist es möglich, den zwischen den Dichtungen liegenden Bereich des Ventilkörpers so zu positionieren, dass der Einlasskanal vollständig gesperrt wird. In jedem Fall ist aber sichergestellt, dass Abgase nicht unmittelbar von der Einlasskammer zur Auslasskammer bzw. unmittelbar von der Auslasskammer zur Einlasskammer unter Umgehung des Kühlers übertreten können.In principle, it is possible within the scope of the invention to make the interior of the valve housing non-circular. However, it is considered expedient to design the piston-shaped valve body cylindrical, as well as cylindrical sealant are used in this way. In principle, the valve body should have an upper and a lower seal, which are arranged at a distance from one another which is greater than the diameter or the height of the inlet channel measured in the stroke direction. In this way it is possible to position the area of the valve body lying between the seals in such a way that the inlet channel is completely blocked. In any case, however, it is ensured that exhaust gases can not pass directly from the inlet chamber to the outlet chamber or directly from the outlet chamber to the inlet chamber, bypassing the radiator.
Um die Höhe des Kolbens in Grenzen zu halten, ohne den Querschnitt des Einlasskanals zu sehr zu reduzieren, ist vorgesehen, dass der Einlasskanal breiter als hoch ist, wobei die Höhe des Einlasskanals in Hubrichtung gemessen wird. Der Einlasskanal kann z.B. schlitzförmig konfiguriert sein und sich dadurch über ein größeres Segment des Gehäuses verteilen. Auf diese Weise ist es möglich, in sehr Platz sparender Bauweise Ventilkörper mit geringer Höhe einzusetzen und dadurch Bauraum und Gewicht zu sparen.In order to limit the height of the piston without excessively reducing the cross section of the intake passage, it is provided that the intake passage is wider than high, with the height of the intake passage being measured in the lift direction. The inlet channel may e.g. be configured slot-shaped and thereby distribute over a larger segment of the housing. In this way it is possible to use in a very space-saving design valve body with low height, thereby saving space and weight.
Wie bereits erwähnt, wird die Abgasmenge, die in das Ventilgehäuse einströmt, über die Stellung des Ventilkörpers geregelt. Dieser gibt je nach Stellung einen definierten Querschnitt des zur besseren Mengenregulierung vorzugsweise schräg angeordneten Einlasskanals frei. Das bedeutet, dass der Einlasskanal in einem Winkel zwischen 60° und 90° zur Hubrichtung angeordnet ist. Selbstverständlich ist die Dicke des Ventilkörpers bzw. des Kolbens so bemessen, dass er in der Bypassstellung, in welcher Abgas unmittelbar in die Auslasskammer einströmt, den Querschnitt des Einlasskanals vollständig freigibt. Umgekehrt soll der Ventilkörper auch in der Kühlstellung, in welcher das Abgas vollständig in die Einlasskammer und von dort in den Kühler einströmt, so positionierbar sein, dass der Einlasskanal vollständig frei ist. Der Einlasskanal ist daher vorteilhafterweise mittig zwischen dem Kühlereinlass und dem Kühlerauslass angeordnet, wobei der Einlasskanal aus strömungstechnischen und konstruktiven Gründen vorzugsweise dem Kühlereinlass und dem Kühlerauslass gegenüberliegend angeordnet ist.As already mentioned, the amount of exhaust gas flowing into the valve housing is regulated by the position of the valve body. This gives depending on the position of a defined cross-section of the better volume control preferably obliquely arranged inlet channel. This means that the inlet channel is arranged at an angle between 60 ° and 90 ° to the stroke direction. Of course, the thickness of the valve body or of the piston is dimensioned so that it completely releases the cross-section of the inlet channel in the bypass position, in which exhaust gas flows directly into the outlet chamber. Conversely, even in the cooling position, in which the exhaust gas flows completely into the inlet chamber and from there into the radiator, the valve body should be positionable so that the inlet channel is completely free. The inlet channel is therefore advantageously arranged centrally between the radiator inlet and the radiator outlet, wherein the inlet duct is preferably arranged opposite the radiator inlet and the radiator outlet for flow-related and design reasons.
Die Erfindung wird nachfolgend anhand des in den
Figur 1- eine perspektivische Ansicht einer AGR-Anordnung;
Figur 2- einen Längsschnitt durch die AGR-Anordnung der
, wobei sich der Ventilkörper in der Mittelstellung befindet;Figur 1 Figur 3- einen Längsschnitt durch die AGR-Anordnung der
, bei welcher sich der Ventilkörper in einer Kühlstellung befindet;Figur 1
Figur 4- einen Längsschnitt durch eine AGR-Anordnung der
, bei welcher sich der Ventilkörper in einer Bypassstellung befindet;Figur 1 Figur 5- eine Seitenansicht der AGR-Anordnung zur Darstellung der Ein- und Ausgangsöffnungen und
Figur 6- ein Diagramm, in welchem der Öffnungsquerschnitt des Einslasskanals über dem Hub des Ventilkörpers (Kolbenhub) aufgetragen ist.
- FIG. 1
- a perspective view of an EGR arrangement;
- FIG. 2
- a longitudinal section through the EGR arrangement of
FIG. 1 with the valve body in the middle position; - FIG. 3
- a longitudinal section through the EGR arrangement of
FIG. 1 in which the valve body is in a cooling position;
- FIG. 4
- a longitudinal section through an EGR arrangement of
FIG. 1 in which the valve body is in a bypass position; - FIG. 5
- a side view of the EGR arrangement for displaying the input and output ports and
- FIG. 6
- a diagram in which the opening cross-section of the inlet channel over the stroke of the valve body (piston stroke) is plotted.
In
Anhand der
In
In
Entscheidend bei der erfindungsgemäßen Abgasrückführungsanordnung ist, dass der Einlasskanal 9 quer zur Hubrichtung H im mittleren Bereich zwischen dem Kühlereinlass 10 und dem Kühlerauslass 11 angeordnet ist. Bei diesem Ausführungsbeispiel ist der Einlasskanal 9 leicht zur Bewegungsachse des Ventilkörpers 7 geneigt. Auf diese Weise lässt sich die Abgasmenge besser dosieren.Decisive in the exhaust gas recirculation arrangement according to the invention is that the
Eine exemplarische Darstellung des Öffnungsquerschnitts des Einlasskanals aufgetragen über der Position des Ventilkörpers (Kolbenhub) findet sich in
- 1 -1 -
- AbgasrückführungsanordnungExhaust gas recirculation arrangement
- 2 -2 -
- Kühlercooler
- 3 -3 -
- Ventilgehäusevalve housing
- 4 -4 -
- Stellantriebactuator
- 5 -5 -
- Innenrauminner space
- 6 -6 -
- Einlasskammerinlet chamber
- 7 -7 -
- Ventilkörpervalve body
- 8 -8th -
- Auslasskammeroutlet
- 9 -9 -
- Einlasskanalinlet channel
- 10 -10 -
- Kühlereinlasscooler inlet
- 11 -11 -
- KühlerauslassRadiator outlet
- 12 -12 -
- Auslasskanalexhaust port
- 13 -13 -
- Mantelflächelateral surface
- 14 -14 -
- Dichtungpoetry
- 15 -15 -
- Dichtungpoetry
- 16 -16 -
- Kolbenstangepiston rod
- H -H -
- Hubrichtungstroke direction
Claims (6)
- Exhaust gas recycling assembly comprising a radiator (2) and a valve housing (3), which comprises an inlet duct (9) and an outlet duct (8) for the exhaust gas which is to be fed to and discharged from the radiator (2), a valve body (7) driven by an actuating drive (4) being arranged in the valve housing (3) for changing the flow rate of the exhaust gas in the radiator (2), characterised in that the valve body (7) is a piston which can be linearly displaced inside the valve housing (3), by which piston the interior (5) of the valve housing (3) is divided into an inlet chamber (6) and an outlet chamber (8), the radiator inlet (10) being connected to the inlet chamber (6) and the radiator outlet (11) being connected to the outlet chamber (8), and the inlet duct (9) opening into the interior (5) transverse to the stroke direction (H) of the valve body (7) and being able to be blocked at least in part by a peripheral generated surface (13) of the valve body (7).
- Exhaust gas recycling assembly according to claim 1, characterised in that the valve body (7) comprises an upper and a lower seal (14, 15), the spacing of which is greater than the height of the inlet duct (9) measured in the stroke direction (H).
- Exhaust gas recycling assembly according to either claim 1 or claim 2, characterised in that the inlet duct (9) is at an angle of between 60° and 90° to the stroke direction (H).
- Exhaust gas recycling assembly according to any of claims 1 to 3, characterised in that the inlet duct (9) is wider than it is high, the height of the inlet duct (9) being measured in the stroke direction (H).
- Exhaust gas recycling assembly according to any of claims 1 to 4, characterised in that the actuating drive (4) is an electric actuator which is directly attached to the valve housing (3).
- Exhaust gas recycling assembly according to any of claims 1 to 6, characterised in that the piston-shaped valve body (7) is cylindrical.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006053205A DE102006053205A1 (en) | 2006-11-09 | 2006-11-09 | Exhaust gas recirculation arrangement |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1921301A2 EP1921301A2 (en) | 2008-05-14 |
EP1921301A3 EP1921301A3 (en) | 2012-04-11 |
EP1921301B1 true EP1921301B1 (en) | 2013-12-25 |
Family
ID=39036329
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07019452.7A Not-in-force EP1921301B1 (en) | 2006-11-09 | 2007-10-04 | Exhaust gas feedback assembly |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1921301B1 (en) |
DE (1) | DE102006053205A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008032884B4 (en) | 2008-07-14 | 2018-09-20 | Mahle International Gmbh | Valve device, heat exchanger and charging system for charging an internal combustion engine with a charging fluid |
CN104747324A (en) * | 2015-04-25 | 2015-07-01 | 无锡隆盛科技股份有限公司 | Bypass type EGR (Exhaust Gas Recirculation) cooler |
CN104775945B (en) * | 2015-04-25 | 2018-01-19 | 无锡隆盛科技股份有限公司 | Automobile engine EGR valve integrating device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
HU2488U (en) * | 2002-05-15 | 2003-03-28 | Behr Gmbh & Co Kg | Apparatus for controlling of recirculated exhaust gases in internal combustion engines |
FR2872862B1 (en) * | 2004-07-09 | 2006-09-22 | Renault Sas | CONTROL DEVICE FOR AN EXHAUST GAS RECIRCULATION CIRCUIT OF AN INTERNAL COMBUSTION ENGINE |
-
2006
- 2006-11-09 DE DE102006053205A patent/DE102006053205A1/en not_active Withdrawn
-
2007
- 2007-10-04 EP EP07019452.7A patent/EP1921301B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
EP1921301A2 (en) | 2008-05-14 |
DE102006053205A1 (en) | 2008-05-15 |
EP1921301A3 (en) | 2012-04-11 |
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