EP1795731B1 - Exhaust gas recirculation in an internal combustion engine - Google Patents

Exhaust gas recirculation in an internal combustion engine Download PDF

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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
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EP06024255.9A
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German (de)
French (fr)
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EP1795731A2 (en
EP1795731A3 (en
Inventor
Lothar Bauer
Werner Lemme
Dirk Sanders
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Deutz AG
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Deutz AG
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Publication of EP1795731A3 publication Critical patent/EP1795731A3/en
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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 DE 10 2004 023 540 A1 offenbart eine Brennkraftmaschine mit einem Kurbelgehäuse und einem Zylinderkopf, an dem eine Abgassammelleitung und eine Frischgasleitung als Teil eines Frischgassystems befestigt sind, wobei die Abgassammelleitung und das Frischgassystem über eine Abgasrückführleitung mit in die Abgasrückführleitung eingeschaltetem Abgasrückführsteuerventil und Abgaskühler, bestehend aus einer Abgaskühlleitung und einem Kühlgehäuse, verbunden sind, und wobei die Abgasrückführleitung weiterhin eine Verteilleitung aufweist, die entlang der Frischgasleitung verläuft und mit dem Frischgassystem verbunden ist, wobei die Verteilleitung einstückig mit dem Zylinderkopf ausgebildet ist.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.

Eine derartige Brennkraftmaschine ist aus der DE 296 23 498 U1 bekannt. Diese Brennkraftmaschine weist ein Abgasrückführsystem auf, das eine Entnahmeleitung und eine Einspeiseleitung aufweist, die auf gegenüberliegenden Zylinderkopflängsseiten in die Auflagefläche des Zylinderkopfs auf dem Kurbelgehäuse eingelassen sind. Verbunden sind die Entnahmeleitung und die Einspeiseleitung über einen an einer Zylinderkopfstirnseite angeordneten Querkanal unter Einschaltung eines Steuerventils. Dieses Abgasrückführsystem benötigt zwar wenige externe Leistungen, die Entnahmeleitung und die Einspeiseleitung sind aber in thermisch hoch belasteten Bereichen der Brennkraftmaschine angeordnet und belasten somit einerseits die beispielsweise hier angeordnete Zylinderkopfdichtung und verschlechtern andererseits die Wärmeabfuhr in diesem Bereich, da durch diese Leitungen die Kühlmittelfläche genau in dem thermisch hoch belasteten Bereich verringert wird.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. Although this exhaust gas recirculation system requires However, a few external services, the extraction line and the feed line are arranged in thermally highly loaded areas of the engine and thus burden on the one hand, for example, arranged cylinder head gasket and deteriorate on the other hand, the heat dissipation in this area, because through these lines, the coolant surface exactly in the thermally highly loaded area is reduced.

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.
Show it:
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 Fig. 1 weist ein Kurbelgehäuse auf, das bodenseits von einer Ölwanne 2 verschlossen ist und auf der gegenüberliegenden Seite zu der Ölwanne 2 von einem Zylinderkopf 3 abgedeckt ist. In dem Kurbelgehäuse 1 ist eine Kurbelwelle gelagert, an der Pleuel angelenkt sind, die wiederum mit Kolben verbunden sind, die in Zylindern des Kurbelgehäuses 1 bei einer Verbrennung von Luft und Kraftstoff in den von den Kolben, Zylindern und dem jeweiligen Zylinderkopfabschnitt gebildeten Brennräumen auf und ab bewegt werden und die Kurbelwelle in Drehung versetzen. An der Kurbelwelle ist auf einer Brennkraftmaschinenstirnseite ein schwungrad 4 befestigt, das in einem SAE-Gehäuse 5 angeordnet ist. Auf der gegenüberliegenden Stirnseite zu dem Schwungrad 4 ist an der Kurbelwelle ein von einem Zahnriemengehäuse 6 umschlossener Zahnriemen zum Antrieb einer Nockenwelle angeordnet, wobei die Nockenwelle Nocken zur Betätigung der Gaswechselventile in dem Zylinderkopf 3 und Nocken zur Betätigung von direkt in das Kurbelgehäuse 1 eingesetzten Einspritzpumpenelementen aufweist. Vor dem Zahnriemengehäuse 6 ist auf der Kurbelwelle ein Riemenrad 7 befestigt, das über einen nicht dargestellten Riemen beispielsweise ein Gebläse, ein Lüfterrad oder einen Generator, antreibt.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. In the crankcase 1, 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. On the crankshaft, a flywheel 4 is mounted on an engine front side, which is arranged in an SAE housing 5. On the opposite end face to the flywheel 4, 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 , Before the timing belt housing 6, a pulley 7 is mounted on the crankshaft, which drives a belt, not shown, for example, a blower, a fan or a generator.

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 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 Zylinderkopfängsseite 21 each with a Frischgaskanalflansch 10 and a Abgaskanalflansch 11. On the Frischgaskanalflanschen 10 is a fresh gas line 12 and on the Abgaskanalflanschen 11, an exhaust manifold 13 is attached. Both the fresh 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. Likewise, as an embodiment variant on the exhaust-gas channel flanges 11, an exhaust-gas collecting damper can be flanged directly.

Das Abgasrückführsystem weist bei dem Ausführungsbeispiel gemäß Fig. 1 einen von dem SAE-gehäuseseitigen Abgaskanal 9 abzweigenden Entnahmekanal auf, der eine Entnahmekanalmündung 14a neben dem Abgaskanalflansch 11 aufweist. An diese Entnahmekanalmündung 14a ist eine Entnahmeleitung 15a befestigt, die zur Erreichung einer gewünschten Rückkühlung des zurückgeführten Abgases eine vorgegebene Länge aufweist, die durch einen U-bogenförmigen Verlauf der Entnahmeleitung 15a realisiert ist. Die Entnahmeleitung 15a mündet in ein Steuerventilgehäuse 16, das auf der SAE-gehäuseseitigen Stirnseite des Zylinderkopfs 3 angeordnet ist. In dem Steuerventilgehäuse 16 ist das Steuerventil eingebaut, das elektrisch, hydraulisch oder mechanisch betätigt wird und die Menge des rückgeführten Abgases stufenlos oder in Form einer "Auf - Zu" -Steuerung festlegt. Dazu wird beispielsweise die Stellung einer Regelstange, die die von den Einzeleinspritzpumpenelementen geförderte Kraftstoffmenge bestimmt, herangezogen und deren Stellung zur Steuerung des Steuerventils ausgewertet. Diese Auswertung kann beispielsweise über die Stellung der Regelstange kontaktlos aufnehmende Sensoren erfolgen, die dann eine elektrische Verstellvorrichtung ansteuern. Eine solche Ausbildung hat den Vorteil, das die Brennkraftmaschine, sofern diese als mechanisch gesteuerte Brennkraftmaschine ausgebildet ist, auch weiterhin ohne eine elektronische Steuereinrichtung auskommt.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. In the 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. For this purpose, for example, 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.

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 control valve housing 16, 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.

Im Unterschied zu dem Ausführungsbeispiel gemäß Fig. 1 ist bei der Brennkraftmaschine gemäß Fig. 2 die Entnahme des zurückzuführenden Abgases aus den Abgaskanälen 9 konstruktiv anders ausgebildet. Hier ist oberhalb zumindest eines Abgaskanalflansches 11 eine Entnahmekanalmündung 14b angeordnet, an der in geeigneter Weise ein kurzer Entnahmeleitungsabschnitt 20 befestigt ist. Der Entnahmeleitungsabschnitt 20 mündet in eine Entnahmeleitung 15b, die sich unterhalb der Abgassammelleitung 13 über zumindest eine Teillänge der Abgassammelleitung 13 parallel zu dieser erstreckt. In die Entnahmeleitung 15b können Kompensatoren 22 zum Ausgleich von Fluchtungsfehlern und Wärmespannungen eingesetzt sein. Der Entnahmeleitungsabschnitt 20 ist jeweils zwischen dem Frischgaskanalflansch 10 und dem Abgaskanalflansch 11 einer Zylindereinheit angeordnet. Bei dem dargestellten Ausführungsbeispiel sind drei Entnahmekanalmündungen 14b vorgesehen, wobei an der riemenseitigen Zylindereinheit keine Entnahmekanalmündung 14b vorgesehen ist.In contrast to the embodiment according to Fig. 1 is in the internal combustion engine according to Fig. 2 the removal of the recirculated exhaust gas from the exhaust ducts 9 constructively designed differently. In this case, 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. In the extraction line 15b 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 Entnahmekanalmündungen 14b are provided, wherein on the belt-side cylinder unit no removal channel mouth 14b is provided.

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 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.

Es ist im Rahmen der Erfindung ausdrücklich auch vorgesehen und möglich, die Ausführungsbeispiele der Fig. 1 und 2 miteinander zu kombinieren. Das heißt also konkret bei dem Ausführungsbeispiel gemäß Fig. 2 kann zusätzlich auch eine Entnahmekanalmündung 14a gemäß Fig. 1 vorgesehen sein und diese mit der Entnahmeleitung 15b verbunden sein.It is expressly provided and possible within the scope of the invention, the embodiments of the Fig. 1 and 2 to combine with each other. So that means specifically in the embodiment according to Fig. 2 In addition, 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.

Eine solche Ausgestaltung ist in der Fig. 3 dargestellt. Bei diesem Ausführungsbeispiel ist dem SAE-gehäuseseitigen Zylinder 1 eine Entnahmekanalmündung 14a angeordnet, die über einen kurzen, geschnitten dargestellten Entnahmeleitungsabschnitt 20a mit der Entnahmeleitung 15c verbunden ist. Die weiteren Zylinder 2 und 3 sind - wie bei der Fig. 2 dargestellt - über Entnahmeleitungsabschnitte 20 mit der Entnahmeleitung 15b verbunden. In diesem Ausführungsbeispiel ist die Entnahmeleitung 15a als durchgehende Leitung ausgebildet und der kurze Entnahmeleitungsabschnitt 20a ist über eine Muffenverbindung mit der Entnahmeleitung 15b verbunden. Da die Entnahmeleitung 15c mit den Entnahmeleitungsabschnitten 20, 20a eine relativ steife Baueinheit bildet, muss dieses Leitungsgebilde passgenau für eine problemlose Montage an der Brennkraftmaschine gefertigt sein. Selbstverständlich können aber bei dieser Ausgestaltung an geeigneter Stelle ein oder mehrere Kompensatoren vorgesehen sein.Such an embodiment is in the Fig. 3 shown. In this embodiment, 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. In this embodiment, 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. Of course, however, one or more compensators may be provided at a suitable location in this embodiment.

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 Fig. 4 dargestellt. Im Ausgangszustand, also bei nicht vorhandener Bypassbohrung 23, wird im Volllastbereich bis zu dem Zeitpunkt des Öffnens des Ventiltellers in dem Steuerventilgehäuse 16 kein Abgas zurückgeführt. Es ergibt sich angenähert eine Rückführung von Abgas gemäß der strichliniierten Kurve ①. Wird die Bypassbohrung in dem Steuerventilgehäuse 16 angebracht, ergibt sich eine Abgasrückführcharakteristik gemäß der strichpunktliniierten Kurve ②. Wird die Bypassbohrung 23 schließlich in der in Fig. 3 dargestellten Weise angebracht, ergibt sich die Kurve ③, die im Unterschied zu der Kurve 2 darstellt, dass im Teillastbereich eine höhere Abgasmenge zurückgeführt wird.The adjustment of the necessary exhaust gas recirculation rates is consequently dependent on the power setting of the internal combustion engine. In particular, low power settings require a high exhaust gas recirculation rate to meet the specific emissions levels. At the same time at low power setting in the full load range, 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. This is achieved by the bypass bore 23. Alternatively, the bypass bore 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.

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 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. In a modification of this embodiment, it is further provided to detachably fasten the extraction line 15a, 15b, 15c to the crankcase 1 and to integrate the removal channels or the removal line sections 20 into the crankcase 1 or the cylinder head 3, as explained above. Finally, it is also provided to manufacture the feed line 17 optionally together with the control valve housing 16 in one piece with the valve cover cap 18.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

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)

  1. 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).
  2. 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).
  3. 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.
  4. 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).
  5. Internal combustion engine according to one of the preceding claims, characterized in that the removal line (15a, 15b) is fastened to the crankcase (1).
  6. Internal combustion engine according to Claim 5, characterized in that the removal line (15a, 15b) is manufactured in one piece with the crankcase (1).
  7. 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).
  8. 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).
  9. 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).
  10. 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).
EP06024255.9A 2005-12-08 2006-11-23 Exhaust gas recirculation in an internal combustion engine Not-in-force EP1795731B1 (en)

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

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EP1795731A2 EP1795731A2 (en) 2007-06-13
EP1795731A3 EP1795731A3 (en) 2009-12-09
EP1795731B1 true EP1795731B1 (en) 2016-06-22

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Application Number Title Priority Date Filing Date
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Family Cites Families (5)

* Cited by examiner, † Cited by third party
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

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EP1795731A3 (en) 2009-12-09
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