EP1795731B1 - Exhaust gas recirculation in an internal combustion engine - Google Patents
Exhaust gas recirculation in an internal combustion engine Download PDFInfo
- Publication number
- EP1795731B1 EP1795731B1 EP06024255.9A EP06024255A EP1795731B1 EP 1795731 B1 EP1795731 B1 EP 1795731B1 EP 06024255 A EP06024255 A EP 06024255A EP 1795731 B1 EP1795731 B1 EP 1795731B1
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- EP
- European Patent Office
- Prior art keywords
- line
- exhaust gas
- internal combustion
- combustion engine
- removal
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/20—Feeding recirculated exhaust gases directly into the combustion chambers or into the intake runners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/42—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
Definitions
- the DE 10 2004 023 540 A1 discloses an internal combustion engine having a crankcase and a cylinder head to which an exhaust manifold and a fresh gas line are attached as part of a fresh gas system, the exhaust manifold and the fresh gas system via an exhaust gas recirculation line with exhaust gas recirculation control valve and exhaust cooler connected to the exhaust gas recirculation line consisting of an exhaust gas cooling pipe and a cooling housing; and wherein the exhaust gas recirculation line further comprises a distribution line extending along the fresh gas line and connected to the fresh gas system, wherein the distribution line is formed integrally with the cylinder head.
- Such an internal combustion engine is from the DE 296 23 498 U1 known.
- This internal combustion engine has an exhaust gas recirculation system, which has a removal line and a feed line, which are embedded on opposite cylinder head longitudinal sides in the bearing surface of the cylinder head on the crankcase. Connected to the extraction line and the feed line via a arranged on a cylinder head end transverse channel with the involvement of a control valve.
- the invention has for its object to provide an internal combustion engine with an exhaust gas recirculation system, which can be mounted on the one hand to save space on the engine, on the other hand, the cooling system of the internal combustion engine is not adversely affected.
- This object is achieved in that the exhaust duct and the fresh gas duct open on a common cylinder head longitudinal side and the extraction line and the feed line are arranged one above the other along the cylinder head longitudinal side.
- This design has the advantage that on the one hand, the thermally highly loaded bearing surface between the crankcase and the cylinder head is relieved and on the other hand, the sampling line and the feed line are simple and straightforward and no complicated baüraumverierernde connection is necessary by the superimposed arrangement. In addition, by removing the extraction line and the feed line from the support surface cooling of the recirculated exhaust gas is possible.
- the cylinder head per cylinder has a removal channel mouth and a feed channel mouth.
- a single bleed channel mouth on an exhaust passage in an embodiment of the internal combustion engine as a 4-cylinder engine is taken from the exhaust gas for exhaust gas recirculation, and also provide only to a cylinder feed-in mouth.
- at least each cylinder is advantageously assigned with one intake port mouth and a plurality of (two, three or four) cylinders with an intake port mouth.
- the feed line is made of a cast material, in particular gray cast iron.
- the feed line can be additionally provided with cooling fins and / or wear fastening devices for other components.
- the extraction line is preferably arranged on the crankcase directly under the exhaust manifold.
- the exhaust gas branched off from the exhaust gas ducts is to be supplied to the withdrawal line either flow-optimized or path-optimized.
- the extraction line can also be made in one piece with the crankcase.
- the feed line is integral with the control valve housing manufacturable.
- a bypass bore connects an exhaust passage to the feed line.
- the internal combustion engine according to Fig. 1 has a crankcase, which is closed on the bottom side by an oil pan 2 and is covered on the opposite side to the oil pan 2 by a cylinder head 3.
- a crankshaft is mounted, are articulated to the connecting rods, which in turn are connected to pistons which are in cylinders of the crankcase 1 during combustion be moved up and down of the air and fuel in the combustion chambers formed by the pistons, cylinders and the respective cylinder head portion and set the crankshaft in rotation.
- a flywheel 4 is mounted on an engine front side, which is arranged in an SAE housing 5.
- a toothed belt enclosed by a toothed belt housing 6 for driving a camshaft is arranged on the crankshaft, the camshaft having cams for actuating the gas exchange valves in the cylinder head 3 and cams for actuating injection pump elements inserted directly into the crankcase 1 ,
- a pulley 7 is mounted on the crankshaft, which drives a belt, not shown, for example, a blower, a fan or a generator.
- the gas exchange valves used in the cylinder head 3 control the gas exchange with the combustion chambers, wherein the respective gas exchange channels per cylinder are a fresh gas channel 8 and an exhaust passage 9, which open on a ZylinderkopfNicolsseite 21 each with a Frischgaskanalflansch 10 and a Abgaskanalflansch 11.
- the respective gas exchange channels per cylinder are a fresh gas channel 8 and an exhaust passage 9, which open on a ZylinderkopfNicolsseite 21 each with a Frischgaskanalflansch 10 and a Abgaskanalflansch 11.
- the synthetic gas line 12 and the exhaust manifold 13 are specially adapted for different applications of the internal combustion engine and have, for example, variously designed and arranged connections for further exhaust pipes or intake pipes or the use of an exhaust gas turbocharger.
- an exhaust-gas collecting damper can be flanged directly.
- the exhaust gas recirculation system has in the embodiment according to Fig. 1 one branched from the SAE housing-side exhaust duct 9 Extraction channel, which has a withdrawal channel mouth 14a adjacent the Abgaskanalflansch 11. Attached to this removal channel opening 14a is a removal line 15a, which, in order to achieve a desired recooling of the recirculated exhaust gas, has a predetermined length, which is realized by a U-curved course of the removal line 15a.
- the extraction line 15a opens into a control valve housing 16, which is arranged on the SAE housing-side end face of the cylinder head 3.
- control valve housing 16 the control valve is installed, which is electrically, hydraulically or mechanically operated and determines the amount of recirculated exhaust gas continuously or in the form of an "open-close" control.
- the position of a control rod which determines the amount of fuel delivered by the individual injection pump elements, used and evaluated their position to control the control valve. This evaluation can be done for example via the position of the control rod contactless receiving sensors, which then drive an electric adjusting device.
- Such a design has the advantage that the internal combustion engine, if it is designed as a mechanically controlled internal combustion engine, continues to manage without an electronic control device.
- a feed line 17 which is arranged between the fresh gas line 12 and a valve cover hood 18, is guided along the cylinder head 3.
- This feed line 17 is connected to feed channel openings 19, which open separately from the associated Frischgaskanalflansch 10 in the cylinder head wall and are flow-connected via a feed channel to the fresh gas channel 8.
- a removal channel opening 14b is arranged above at least one exhaust gas channel flange 11, to which a short removal line section 20 is fastened in a suitable manner.
- the removal line section 20 opens into a removal line 15b, which extends below the exhaust manifold 13 over at least a partial length of the exhaust manifold 13 parallel to this.
- compensators 22 may be used to compensate for misalignment and thermal stresses.
- the removal line section 20 is in each case arranged between the Frischgaskanalflansch 10 and the Abgaskanalflansch 11 a cylinder unit. In the illustrated embodiment, three Entddlingkanalmünditch 14b are provided, wherein on the belt-side cylinder unit no removal channel mouth 14b is provided.
- the removal of the recirculated exhaust gas in the region above the exhaust gas channel flanges 11 has the advantage that the design of the exhaust gas channels 9 in this area a high back pressure prevails and consequently larger amounts of exhaust gas can be removed.
- a withdrawal channel opening 14a may also be provided according to FIG Fig. 1 be provided and this be connected to the sampling line 15b.
- FIG. 3 Such an embodiment is in the Fig. 3 shown.
- the SAE-housing-side cylinder 1, a removal channel mouth 14a is arranged, which is connected via a short, shown cutting line section 20a with the extraction line 15c.
- the other cylinders 2 and 3 are - as in the Fig. 2 represented - via removal line sections 20 connected to the sampling line 15b.
- the extraction line 15a is formed as a continuous line and the short extraction line section 20a is connected via a sleeve connection with the extraction line 15b. Since the extraction line 15c forms a relatively rigid structural unit with the removal line sections 20, 20a, this line structure must be made precisely fitting for trouble-free installation on the internal combustion engine.
- one or more compensators may be provided at a suitable location in this embodiment.
- the exhaust duct 9 of the cylinder 1 is connected directly via a bypass bore 23 with the feed line 17.
- a small amount of exhaust gas which depends inter alia on the bore diameter of the bypass bore 23, returned.
- This embodiment is based on the following considerations. In order to meet future emission requirements, a high exhaust gas recirculation rate is generally required in the partial load range. In contrast, only a small amount of exhaust gas should be returned in the full load range, so as not to worsen the thermal characteristics of the internal combustion engine and the soot level in this operating condition.
- the adjustment of the necessary exhaust gas recirculation rates is consequently dependent on the power setting of the internal combustion engine.
- low power settings require a high exhaust gas recirculation rate to meet the specific emissions levels.
- the temperature and soot level of the engine is less critical, the exhaust gas recirculation compatibility so higher. This circumstance makes it possible to reduce a small amount of exhaust even at full load.
- the bypass bore 23 may also be in the control valve housing 16 in the mold be introduced that the bypass bore with closed valve disc of the control valve (wherein the valve disc is closed at full load) still releases a certain cross-section.
- the bypass bore 23 has the effect that a higher amount of exhaust gas is recirculated even in the partial load range because the cross section of the bypass bore 23 is available as an additional surface for the recirculation of exhaust gas.
- the previously explained relationships are otherwise in the diagram according to Fig. 4 shown.
- In the initial state that is to say when there is no bypass bore 23, no exhaust gas is recirculated in the full-load range until the time when the valve disk is opened in the control valve housing 16. This results in approximately a return of exhaust gas according to the dashed curve 1. If the bypass bore is mounted in the control valve housing 16, the result is an exhaust gas recirculation characteristic according to the dash-dotted line curve 2. If the bypass bore 23 finally in the in Fig. 3 shown attached, results in the curve 3, which in contrast to the curve 2 shows that a higher amount of exhaust gas is returned in the partial load range.
- the extraction line 15a, 15b, 15c integrally cast on the crankcase and to integrate the removal channel or the removal line section 20 in the crankcase 1 and the cylinder head 3, in which case the removal channel or the removal line section 20 opens on the crankcase side in the exhaust duct 9.
- the feed line 17 optionally together with the control valve housing 16 in one piece with the valve cover cap 18.
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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)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
Die
Eine derartige Brennkraftmaschine ist aus der
Der Erfindung liegt die Aufgabe zugrunde, eine Brennkraftmaschine mit einem Abgasrückführsystem bereitzustellen, das einerseits platzsparend an der Brennkraftmaschine montierbar ist, andererseits aber das Kühlsystem der Brennkraftmaschine nicht nachteilig beeinflusst.The invention has for its object to provide an internal combustion engine with an exhaust gas recirculation system, which can be mounted on the one hand to save space on the engine, on the other hand, the cooling system of the internal combustion engine is not adversely affected.
Diese Aufgabe wird dadurch gelöst, dass der Abgaskanal und der Frischgaskanal auf einer gemeinsamen Zylinderkopflängsseite münden und die Entnahmeleitung und die Einspeiseleitung entlang der Zylinderkopflängsseite übereinanderliegend angeordnet sind. Diese Ausbildung hat den Vorteil, dass einerseits die thermisch hoch belastete Auflagefläche zwischen dem Kurbelgehäuse und dem Zylinderkopf entlastet wird und andererseits die Entnahmeleitung und die Einspeiseleitung einfach und unkompliziert aufgebaut sind und durch die übereinanderliegende Anordnung keine komplizierte baüraumvergrößernde Verbindung notwendig ist. Hinzu kommt, dass durch die Herausnahme der Entnahmeleitung und der Einspeiseleitung aus der Auflagefläche eine Kühlung des zurückgeführten Abgases möglich ist. Dadurch, dass die Ehtnahmeleituhg und die Einspeiseleitung nicht mit der Abgassammelleitung und der Frischgasleitung verbunden sind, sondern direkt mit in den Zylinderkopf eingelassenen Kanälen strömungsverbunden sind, brauchen die Abgassammelleitung und die Frischgasleitung nicht geändert zu werden. Dies ist insbesondere dann vorteilhaft, wenn eine Vielzahl von unterschiedlich ausgebildeten Abgassammelleitungen und Frischgasleitungen für eine Motorenbaureihe angeboten werden, die sich beispielsweise hinsichtlich der Anschlüsse für weiterführende Abgasleitungen oder Ansaugleitungen oder der Anordnung von einem Abgasturbolader unterscheiden.This object is achieved in that the exhaust duct and the fresh gas duct open on a common cylinder head longitudinal side and the extraction line and the feed line are arranged one above the other along the cylinder head longitudinal side. This design has the advantage that on the one hand, the thermally highly loaded bearing surface between the crankcase and the cylinder head is relieved and on the other hand, the sampling line and the feed line are simple and straightforward and no complicated baüraumvergrößernde connection is necessary by the superimposed arrangement. In addition, by removing the extraction line and the feed line from the support surface cooling of the recirculated exhaust gas is possible. Characterized in that the Ehtnahmeeituhg and the feed line are not connected to the exhaust manifold and the fresh gas line, but are directly connected fluidly with recessed into the cylinder head channels, the exhaust manifold and the fresh gas line need not be changed. This is particularly advantageous when a variety of differently designed exhaust manifolds and fresh gas lines are offered for a motor series, which, for example, in terms of Distinguish connections for further exhaust pipes or intake pipes or the arrangement of an exhaust gas turbocharger.
In Weiterbildung der Erfindung weist der Zylinderkopf je Zylinder eine Entnahmekanalmündung und eine Einspeisekanalmündung auf. Grundsätzlich ist es im Rahmen der vorliegenden Erfindung möglich, bei einer Ausbildung der Brennkraftmaschine als 4-zylindrige Brennkraftmaschine eine einzige Entnahmekanalmündung an einem Abgaskanal vorzusehen, aus der Abgas für die Abgasrückführung entnommen wird, und auch nur an einen Zylinder eine Einspeisekanalmündung vorzusehen. Um aber eine möglichst unter allen Betriebsbedingungen gleichmäßige Druckverteilung in dem Abgasrückführsystem zu gewährleisten, sind vorteilhaft zumindest jedem Zylinder eine Einspeisekanalmündung und mehreren (zwei, drei oder vier) Zylindern eine Entnahmekanalmündung zugeordnet.In a development of the invention, the cylinder head per cylinder has a removal channel mouth and a feed channel mouth. In principle, it is possible in the context of the present invention to provide a single bleed channel mouth on an exhaust passage in an embodiment of the internal combustion engine as a 4-cylinder engine, is taken from the exhaust gas for exhaust gas recirculation, and also provide only to a cylinder feed-in mouth. However, in order to ensure a pressure distribution in the exhaust gas recirculation system that is as uniform as possible under all operating conditions, at least each cylinder is advantageously assigned with one intake port mouth and a plurality of (two, three or four) cylinders with an intake port mouth.
In weiterer Ausgestaltung der Erfindung ist die Einspeiseleitung aus einem Gusswerkstoff, insbesondere Grauguss, hergestellt. Dabei kann die Einspeiseleitung zusätzlich mit Kühlrippen versehen sein und/oder Befestigungsvorrichtungen für andere Bauteile tragen.In a further embodiment of the invention, the feed line is made of a cast material, in particular gray cast iron. In this case, the feed line can be additionally provided with cooling fins and / or wear fastening devices for other components.
In Weiterbildung der Erfindung weist die Einspeiseleitung an beiden Stirnseiten einen Flansch zum wahlweisen Anschluss eines separaten Steuerventilgehäuses auf. Durch diese Ausbildung ist es möglich, das Ventilgehäuse je nach Platzangebot bei unterschiedlichen Einbaufällen der Brennkraftmaschine wahlweise anzuordnen.In a further development of the invention, the feed line on both end faces on a flange for selectively connecting a separate control valve housing. With this design, it is possible to optionally arrange the valve housing depending on the space available at different installation cases of the internal combustion engine.
In weiterer Ausgestaltung der Erfindung ist die Entnahmeleitung an dem Kurbelgehäuse bevorzugt direkt unter der Abgassammelleitung angeordnet. Dabei ist das aus den Abgaskanälen abgezweigte Abgas entweder strömungs- oder wegoptimiert der Entnahmeleitung zuzuführen. Dabei kann die Entnahmeleitung auch einstückig mit dem Kurbelgehäuse gefertigt werden.In a further embodiment of the invention, the extraction line is preferably arranged on the crankcase directly under the exhaust manifold. In this case, the exhaust gas branched off from the exhaust gas ducts is to be supplied to the withdrawal line either flow-optimized or path-optimized. The extraction line can also be made in one piece with the crankcase.
Im Übrigen ist die Einspeiseleitung einstückig mit dem Steuerventilgehäuse fertigbar.Incidentally, the feed line is integral with the control valve housing manufacturable.
In weiterer Ausgestaltung der Erfindung verbindet eine Bypassbohrung einen Abgaskanal mit der Einspeiseleitung. Dadurch wird in allen Betriebszuständen der Brennkraftmaschine, also auch bei Volllast, eine geringe Abgasmenge zurückgeführt.In a further embodiment of the invention, a bypass bore connects an exhaust passage to the feed line. As a result, in all operating states of the internal combustion engine, so even at full load, a small amount of exhaust gas is returned.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der in den Zeichnungen dargestellte Ausführungsbeispiele der Erfindung näher beschrieben sind.Further advantageous embodiments of the invention are described in the drawings, are described in more detail in the illustrated in the drawings embodiments of the invention.
Es zeigen:
- Fig. 1:
- eine perspektivische Ansicht einer Brennkraftmaschine mit einem Abgasrückführsystem, das aus einem einzigen Entnahmekanal Abgas entnimmt und
- Fig. 2:
- eine Brennkraftmaschine, bei der aus mehreren Entnahmekanälen Abgas zur Rückführung entnommen wird,
- Fig. 3:
- eine Brennkraftmaschine, bei der ebenfalls aus mehreren Entnahmekanälen Abgas zur Rückführung entnommen wird,
- Fig. 4:
- ein Diagramm mit verschiedenen Abgasrückführformen.
- Fig. 1:
- a perspective view of an internal combustion engine with an exhaust gas recirculation system that removes exhaust gas from a single extraction channel and
- Fig. 2:
- an internal combustion engine in which exhaust gas is removed for recycling from a plurality of removal ducts,
- 3:
- an internal combustion engine in which exhaust gas is also removed from a plurality of removal ducts for recycling
- 4:
- a diagram with different exhaust gas recirculation forms.
Die Brennkraftmaschine gemäß
Die in dem Zylinderkopf 3 eingesetzten Gaswechselventile steuern den Gaswechsel mit den Brennräumen, wobei die entsprechenden Gaswechselkanäle je Zylinder ein Frischgaskanal 8 und ein Abgaskanal 9 sind, die auf einer Zylinderkopflängsseite 21 mit jeweils einem Frischgaskanalflansch 10 und einem Abgaskanalflansch 11 münden. An den Frischgaskanalflanschen 10 ist eine Frischgasleitung 12 und an den Abgaskanalflanschen 11 ist eine Abgassammelleitung 13 befestigt. Sowohl die Frischgasleitung 12 als auch die Abgassammelleitung 13 sind für unterschiedliche Anwendungen der Brennkraftmaschine speziell angepasst und weisen beispielsweise verschiedenartig ausgebildete und angeordnete Anschlüsse für weiterführende Abgasleitungen oder Ansaugleitungen oder den Einsatz eines Abgasturboladers auf. Ebenso kann als Ausführungsvariante an den Abgaskanalflanschen 11 ein Abgassammeldämpfer direkt angeflanscht werden.The gas exchange valves used in the
Das Abgasrückführsystem weist bei dem Ausführungsbeispiel gemäß
Von dem Steuerventilgehäuse 16 ausgehend ist eine Einspeiseleitung 17, die zwischen der Frischgasleitung 12 und einer Ventildeckelhaube 18 angeordnet ist, entlang des Zylinderkopfs 3 geführt. Diese Einspeiseleitung 17 ist mit Einspeisekanalmündungen 19 verbunden, die separat von dem zugehörigen Frischgaskanalflansch 10 in die Zylinderkopfwand münden und über einen Einspeisekanal mit dem Frischgaskanal 8 strömungsverbunden sind.Starting from the
Im Unterschied zu dem Ausführungsbeispiel gemäß
Die Entnahme des zurückzuführenden Abgases im Bereich oberhalb der Abgaskanalflansche 11 hat den Vorteil, dass durch die Ausgestaltung der Abgaskanäle 9 in diesem Bereich ein hoher Staudruck herrscht und demzufolge größere Abgasmengen entnommen werden können.The removal of the recirculated exhaust gas in the region above the exhaust
Es ist im Rahmen der Erfindung ausdrücklich auch vorgesehen und möglich, die Ausführungsbeispiele der
Eine solche Ausgestaltung ist in der
Weiterhin ist bei diesem Ausführungsbeispiel der Abgaskanal 9 des Zylinders 1 direkt über eine Bypassbohrung 23 mit der Einspeiseleitung 17 verbunden. Über diese Bypassbohrung wird in allen Betriebszuständen der Brennkraftmaschine eine geringe Abgasmenge, die unter anderem von dem Bohrungsdurchmesser der Bypassbohrung 23 abhängt, zurückgeführt. Dieser Ausgestaltung liegen die folgenden Überlegungen zugrunde. Um künftige Emissionsanforderungen zu erfüllen, ist im Teillastbereich generell eine hohe Abgasrückführrate notwendig. Dagegen soll im Volllastbereich nur eine geringe Menge Abgas zurückgeführt werden, um die Thermik der Brennkraftmaschine und das Rußniveau in diesem Betriebszustand nicht zu verschlechtern.Furthermore, in this embodiment, the exhaust duct 9 of the cylinder 1 is connected directly via a bypass bore 23 with the feed line 17. About this bypass hole is in all operating conditions of the internal combustion engine, a small amount of exhaust gas, which depends inter alia on the bore diameter of the bypass bore 23, returned. This embodiment is based on the following considerations. In order to meet future emission requirements, a high exhaust gas recirculation rate is generally required in the partial load range. In contrast, only a small amount of exhaust gas should be returned in the full load range, so as not to worsen the thermal characteristics of the internal combustion engine and the soot level in this operating condition.
Die Einstellung der notwendigen Abgasrückführraten ist folglich abhängig von der Leistungseinstellung der Brennkraftmaschine. Insbesondere niedrige Nennleistungseinstellungen erfordern eine hohe Abgasrückführrate zur Erfüllung der spezifischen Emissionswerte. Gleichzeitig ist bei geringer Leistungseinstellung im Volllastbereich das Temperatur- und Rußniveau der Brennkraftmaschine weniger kritisch, die Abgasrückführ-Verträglichkeit also höher. Dieser Umstand erlaubt es, auch bei Volllast eine geringe Abgasmenge zurückzuführen. Dies wird durch die Bypassbohrung 23 erreicht. Alternativ kann die Bypassbohrung auch in das Steuerventilgehäuse 16 in der Form eingebracht sein, dass die Bypassbohrung bei geschlossenem Ventilteller des Steuerventils (wobei der Ventilteller bei Volllast geschlossen ist) dennoch einen bestimmten Querschnitt freigibt. Die Bypassbohrung 23 bewirkt, dass auch im Teillastbereich eine höhere Abgasmenge zurückgeführt wird, weil der Querschnitt der Bypassbohrung 23 als zusätzliche Fläche zur Rückführung von Abgas zur Verfügung steht. Die zuvor erläuterten Zusammenhänge sind im Übrigen in dem Diagramm gemäß
Weiterhin ist es im Rahmen der Erfindung auch vorgesehen und möglich, insbesondere die Entnahmeleitung 15a, 15b, 15c einstückig an das Kurbelgehäuse anzugießen und den Entnahmekanal beziehungsweise den Entnahmeleitungsabschnitt 20 in das Kurbelgehäuse 1 beziehungsweise den Zylinderkopf 3 zu integrieren, wobei dann der Entnahmekanal beziehungsweise der Entnahmeleitungsabschnitt 20 auf der kurbelgehäuseseitigen Seite in den Abgaskanal 9 einmündet. In einer Abwandlung von dieser Ausführungsform ist es weiterhin vorgesehen, die Entnahmeleitung 15a, 15b, 15c an dem Kurbelgehäuse 1 lösbar zu befestigen und die Entnahmekanäle beziehungsweise die Entnahmeleitungsabschnitte 20 - wie zuvor ausgeführt - in das Kurbelgehäuse 1 beziehungsweise den Zylinderkopf 3 zu integrieren. Schließlich ist es auch vorgesehen, die Einspeiseleitung 17 gegebenenfalls zusammen mit dem Steuerventilgehäuse 16 einstückig mit der Ventildeckelhaube 18 zu fertigen.Furthermore, it is also provided and possible in the context of the invention, in particular the
- 11
- Kurbelgehäusecrankcase
- 22
- Ölwanneoil pan
- 33
- Zylinderkopfcylinder head
- 44
- Schwungradflywheel
- 55
- SAE-GehäuseSAE housing
- 66
- ZahnriemengehäuseTiming belt housing
- 77
- Riemenradpulley
- 88th
- FrischgaskanalFresh gas channel
- 99
- Abgaskanalexhaust duct
- 1010
- FrischgaskanalflanschFrischgaskanalflansch
- 1111
- AbgaskanalflanschAbgaskanalflansch
- 1212
- FrischgasleitungFresh gas line
- 1313
- AbgassammelleitungExhaust manifold
- 14a, 14b14a, 14b
- EntnahmekanalmündungExtraction duct opening
- 15a, 15b, 15c15a, 15b, 15c
- Entnahmeleitungwithdrawal line
- 1616
- SteuerventilgehäuseControl valve housing
- 1717
- Einspeiseleitungfeeder
- 1818
- VentildeckelhaubeValve cover hood
- 1919
- EinspeisekanalmündungEinspeisekanalmündung
- 20, 20a20, 20a
- EntnahmeleitungsabschnittExtraction line section
- 2121
- ZylinderkopflängsseiteCylinder head long side
- 2222
- Kompensatorcompensator
- 2323
- Bypassbohrungbypass bore
Claims (10)
- Internal combustion engine having a crankcase (1) and a cylinder head (3), into which, per cylinder, at least one exhaust gas duct (8) with an exhaust gas duct flange (11), and a fresh gas duct (8) with a fresh gas duct flange (10) are let, to which in each case one exhaust gas collecting line (13) and one fresh gas line (12) are fastened which are together part of an exhaust gas system and a fresh gas system, an exhaust gas recirculation system being provided with a removable line (15a, 15b, 15c), a control valve housing (16) which has a control valve, and a feed line (17), the cylinder head (3) having at least one removal duct which branches off from the exhaust gas duct (9) and has a removal duct opening (14a, 14b) which is separate from the exhaust gas duct flange (11), opens into a cylinder head wall and is connected to the removal line (15a, 15b, 15c), and at least one feed duct which opens into the fresh gas duct and has a feed duct opening (19) which is separate from the fresh gas duct flange (10), opens into a cylinder head wall and is connected to the feed line, characterized in that the exhaust gas duct (9) and the fresh gas duct (8) open on a cylinder head longitudinal side (21), and the removal line (15a, 15b) and the feed line (17) are arranged so as to lie above one another along the cylinder head longitudinal side (21), the removal of the exhaust gas to be recirculated taking place by means of removal line sections (20), and the removal line sections (20) opening into the removal line (15b, c).
- Internal combustion engine according to Claim 1, characterized in that, per cylinder, the cylinder head (3) has a removal duct opening (14a, 14b) and a feed duct opening (19).
- Internal combustion engine according to Claim 1 or 2, characterized in that the feed line (17) is produced from cast material, in particular grey cast iron.
- Internal combustion engine according to one of the preceding claims, characterized in that, on both end sides, the feed line (17) has a flange for the optional connection of the control valve housing (16).
- Internal combustion engine according to one of the preceding claims, characterized in that the removal line (15a, 15b) is fastened to the crankcase (1).
- Internal combustion engine according to Claim 5, characterized in that the removal line (15a, 15b) is manufactured in one piece with the crankcase (1).
- Internal combustion engine according to one of the preceding claims, characterized in that the feed line (17) is manufactured in one piece with the control valve housing (16).
- Internal combustion engine according to one of the preceding claims, characterized in that the feed line (17) is manufactured in one piece with the valve cover hood (18).
- Internal combustion engine according to one of the preceding claims, characterized in that the feed line (17) and the control valve housing (16) are manufactured in one piece with the valve cover hood (18).
- Internal combustion engine according to one of the preceding claims, characterized in that a bypass bore (23) connects the exhaust gas duct (9) to the feed line (17).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005059060A DE102005059060A1 (en) | 2005-12-08 | 2005-12-08 | Exhaust gas recirculation in an internal combustion engine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1795731A2 EP1795731A2 (en) | 2007-06-13 |
EP1795731A3 EP1795731A3 (en) | 2009-12-09 |
EP1795731B1 true EP1795731B1 (en) | 2016-06-22 |
Family
ID=37603460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06024255.9A Not-in-force EP1795731B1 (en) | 2005-12-08 | 2006-11-23 | Exhaust gas recirculation in an internal combustion engine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1795731B1 (en) |
DE (1) | DE102005059060A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS555718Y2 (en) * | 1975-02-10 | 1980-02-08 | ||
GB2292975A (en) * | 1994-09-10 | 1996-03-13 | Ford Motor Co | I.c. engine cylinder head exhaust recirculation |
DE29623498U1 (en) * | 1996-10-16 | 1998-07-30 | Daimler-Benz Aktiengesellschaft, 70567 Stuttgart | Device for exhaust gas recirculation and secondary air supply for an internal combustion engine |
DE10360092A1 (en) * | 2003-12-20 | 2005-07-21 | Deutz Ag | Exhaust gas return duct for engine, made of gray cast iron and provided with ribbed inner and outer pattern |
DE102004023540A1 (en) * | 2004-05-13 | 2005-12-01 | Deutz Ag | Internal combustion engine has distribution pipe constructed in one piece with cylinder head and may be constructed in one piece with fresh gas line |
-
2005
- 2005-12-08 DE DE102005059060A patent/DE102005059060A1/en not_active Withdrawn
-
2006
- 2006-11-23 EP EP06024255.9A patent/EP1795731B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
EP1795731A2 (en) | 2007-06-13 |
EP1795731A3 (en) | 2009-12-09 |
DE102005059060A1 (en) | 2007-07-05 |
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