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EP1957785B1 - Exhaust-gas recirculation in an air-cooled internal combustion engine - Google Patents

Exhaust-gas recirculation in an air-cooled internal combustion engine Download PDF

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Publication number
EP1957785B1
EP1957785B1 EP06829229A EP06829229A EP1957785B1 EP 1957785 B1 EP1957785 B1 EP 1957785B1 EP 06829229 A EP06829229 A EP 06829229A EP 06829229 A EP06829229 A EP 06829229A EP 1957785 B1 EP1957785 B1 EP 1957785B1
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EP
European Patent Office
Prior art keywords
exhaust
gas
gas recirculation
internal combustion
combustion engine
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
Application number
EP06829229A
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German (de)
French (fr)
Other versions
EP1957785A1 (en
Inventor
Alfons Bleffert
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Deutz AG
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Deutz AG
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Publication date
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Publication of EP1957785A1 publication Critical patent/EP1957785A1/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
    • F02M26/41—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
    • F02M26/22—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
    • F02M26/27—Layout, e.g. schematics with air-cooled heat exchangers
    • 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 internal combustion engine with a crankcase and a cylinder of the crankcase covering cylinder head into which a fresh gas duct and an exhaust duct are inserted, which open on a cylinder head longitudinal side and which are each connected to a fresh gas line and an exhaust manifold, and wherein an exhaust gas recirculation system consisting from an exhaust gas recirculation line and a control valve, is present.
  • Such an internal combustion engine is from the DE 693 00 649 T2 known.
  • This internal combustion engine has a cylinder head, in which the fresh gas ducts and the exhaust ducts of the individual cylinders open on a cylinder head longitudinal side of the cylinder head designed as a block cylinder head.
  • the exhaust manifold has a special connection for attaching the exhaust gas recirculation system, in particular a control valve for controlling the amount of recirculated exhaust gas on.
  • a special component called a ramp is inserted between them and the fresh gas manifold.
  • a disadvantage of this design is that the exhaust manifold must be changed and the height of the internal combustion engine is increased by the insertion of the ramp.
  • the control valve protrudes beyond the given lateral contour of the internal combustion engine. Cooling of the recirculated exhaust gas is not provided and impeded by the immediate proximity to the hot exhaust manifold during operation.
  • the invention has for its object to provide an internal combustion engine with an exhaust gas recirculation system, in which the exhaust gas recirculation system is unaffected by the hot exhaust manifold during operation.
  • the exhaust gas recirculation system is disposed on the cylinder head side opposite the fresh gas line and the exhaust manifold.
  • the cylinder head is preferably a single cylinder head, which is screwed together with the associated cylinder on the crankcase.
  • the invention is also applicable to a block cylinder head and cylinders made in one piece with the crankcase.
  • the channels whose cross-section relative to the aforementioned gas channels can be dimensioned considerably smaller, can be arranged at a suitable location in the cylinder head and be poured in the production of the cylinder head with or subsequently introduced by mechanical machining.
  • these channels are subsequently incorporated by mechanical processing in the cylinder head, so that the cylinder head blank for an engine version with or without exhaust gas recirculation can be the same.
  • an exhaust gas recirculation system consisting of an exhaust gas recirculation manifold, an exhaust gas recirculation control valve and a Abgas Weg lecturverteil effet, easy attachable.
  • an exhaust gas recirculation system consisting of an exhaust gas recirculation manifold, an exhaust gas recirculation control valve and a Abgas Weg lecturverteil effet, easy attachable.
  • the exhaust manifold can remain unchanged compared to a version without exhaust gas recirculation. This is particularly advantageous in particular when different types of exhaust manifolds with, for example, different connections for the continuation of the exhaust gases are provided for different purposes and customer requirements.
  • the design volume of the internal combustion engine which is decisive for installation is not influenced by this configuration and arrangement of the exhaust gas recirculation system, so that a distinction between an internal combustion engine with exhaust gas recirculation and an internal combustion engine without exhaust gas recirculation can be omitted.
  • This is particularly advantageous with regard to the interchangeability of corresponding internal combustion engines installed, for example, in construction machines or agricultural machines.
  • the internal combustion engine has a cooling-air fan and the exhaust-gas recirculation system is arranged directly in the cooling-air flow conveyed by the cooling-air fan within a cooling air-conducting housing.
  • This arrangement initially enables effective cooling of the recirculated exhaust gas without any further expense.
  • the exhaust gas recirculation system can be integrated into adeluftleitkanal, which is formed by adeluftleitgephinuse and disposed along the cylinder head side, and thus in any case not over a given lateral contour protruding component, so as to ensure that one with a corresponding Exhaust gas recirculation system equipped internal combustion engine to the same internal combustion engine without an exhaust gas recirculation system is easily replaceable.
  • an internal combustion engine is preferably an air-cooled internal combustion engine, but it can also be an internal combustion engine with a combined cooling system, wherein the fan cools the cooling medium, such as oil and / or water, and optionally used in addition to the air cooling of the example cylinder head and / or a heat exchanger.
  • the cooling medium such as oil and / or water
  • the exhaust gas recirculation control valve is arranged adjacent to the cooling air blower, so that this thermally sensitive component is cooled particularly effectively and intensively.
  • the exhaust gas recirculation system may in particular have an external ribbing, wherein this external ribbing can, of course, be aligned in the direction of the cooling air flow in an optimized manner in terms of flow.
  • the internal combustion engine according to Fig. 1 has a crankcase 1, which is closed on the bottom side of an oil pan 2. On the crankcase 1 2 cylinder tubes are placed opposite to the oil pan, which in turn are covered by cylinder heads 3. In the embodiment, it is a 4-cylinder internal combustion engine, so that a total of four cylinder tubes and four cylinder heads 3 are installed. In addition, the internal combustion engine air-cooled and accordingly, the cylinder tubes and the cylinder heads 3 are provided with cooling fins 4.
  • a double belt wheel 5 is fastened to a crankshaft mounted in the crankcase 1, which is drive-connected via a first belt 6a to a generator 7 and via a second belt 6b with the intervention of a tensioning roller 8 with a cooling-air fan 9.
  • the cooling air blower 9 is arranged laterally above the crankcase 1 substantially in the area adjacent to the cylinder tubes and the cylinder heads 3 and promotes from the environment sucked cooling air into adeluftleitgephaseuse 10, which extends from the cooling air blower 9 to an opposite flywheel end 11 of the internal combustion engine and the subsidized cooling air distributed across the internal combustion engine along the cylinder tubes and the cylinder heads 3.
  • a maintenance cover of thedeluftleitgephinuses 10 is removed and shown in the region of the cooling air blower 9, thedeluftleitgephinuse 10 ° partially cut, so that an insight into the interior of thedeluftleitgephinuses 10 is given.
  • a row injection pump 12 is attached, which is connected via interrupted injection lines shown 13 a, 13 b used in the cylinder heads 3 fuel injection valves.
  • Each fuel injection valve is secured by means of clamping claws 14 on the cylinder head and connects laterally to a valve cover 15, which extends to an opposite cylinder head longitudinal side to the cool air side housing side cylinder head.
  • a fresh gas line 16 and an exhaust manifold 17 are arranged. In the area above, between and below the fresh gas line 16 and the exhaust manifold 17, a substantial part of the cooling air conveyed by the cooling air blower 9 flows back into the environment.
  • the combustion chambers located in the cylinders between the individual cylinder heads 3 and the pistons movable up and down in the cylinders are flow-connected via gas exchange valves and gas exchange ducts to the fresh gas line 16 and the exhaust manifold 17, respectively.
  • channels 18a, 18b are in the cylinder heads ( Fig. 2 ), of which one channel 18a is connected to a gas exchange outlet channel and the channel 18b is connected side by side to a gas exchange inlet channel.
  • These channels 18a, 18b are guided in a lower portion of the cylinder head 3 on the cooling air fan side cylinder head side and provided with mating connection means 19a, 19b.
  • an exhaust gas recirculation system is arranged, the channels 18 a controllably connected or controllably connected to the channels 18 b.
  • the channels 18a are connected to a common bus 20, which is continued in the region of the flywheel-side end 11 via a sheet 21 in a supply line 22 to an exhaust gas recirculation control valve 23.
  • a deflecting bend 24 is connected to the exhaust gas recirculation control valve 23, which continues in a distribution line 25, which is arranged approximately parallel below the manifold 20 and which in turn is connected to the channels 18b of the individual cylinder heads 3.
  • the entire exhaust gas recirculation system is disposed within thede povertyleitgephasepuruses 10 and is therefore not visible with thede povertyleitgephaseuse closed from the outside on the one hand and on the other hand, it does not affect the outer dimensions of the internal combustion engine. Furthermore, by the arrangement of the exhaust gas recirculation device completely within thedeluftleitgephaseuses 10 effective cooling of the components of the exhaust gas recirculation system.
  • the individual lines and bends as well as the exhaust gas recirculation control valve housing can also be additionally provided with inside and / or outside cooling fins to increase the heat transfer.
  • the in-line injection pump 12 is equipped with a regulator, which is designed as a mechanical regulator.
  • a regulator which is designed as a mechanical regulator.
  • the position of an existing in the series injection pump 12 control rod is tapped contactless and used this position to control the exhaust gas recirculation control valve 23 via a mechanical or electrical transmission device.
  • an electrical controller evaluates a control rod travel signal.
  • a Hall sensor is used, which is connected via one or more integrated into the control rod magnets.
  • Such a Hall sensor is a very reliable electrical switch with which the exhaust gas recirculation can be switched on and off.
  • the exhaust gas recirculation above an injection quantity corresponding to a load greater than three quarters of the full load turned off. In this full load range, no exhaust gas is recirculated, since in the full load range exhaust gas recirculation would lead to a deterioration of exhaust emissions.
  • a plurality of small magnets are inserted next to one another in bores. These magnets switch the outside mounted on the pump housing of the injector Hall sensor. This method or this embodiment is extremely reliable, since this electrical control is expressly not an electronic control device.
  • the exhaust gas recirculation is turned off at a speed below an increased idle speed.
  • This switching function is provided when with decreasing speeds, for example below a limit speed of 1500 rev / min, there is a risk that smoke problems may occur in an exhaust gas recirculation through the design of the injection system.
  • an inductive speed switch is provided, which is also mounted on the pump housing and below in particular a speed of 1450 revolutions / min outputs the desired switching signal.

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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)

Abstract

An internal combustion engine includes a crankcase and a cylinder head which covers a cylinder of the crankcase and in which a fresh-gas channel and an exhaust-gas channel are made which open on a cylinder-head longitudinal side and are connected to in each case a fresh-gas line and an exhaust-gas collection line, and wherein there is an exhaust-gas recirculation system, including an exhaust-gas recirculation line and a control valve. An internal combustion engine having an exhaust-gas recirculation system is provided, in which the exhaust-gas recirculation system remains uninfluenced by the exhaust-gas collection line which is hot during operation. This is achieved in that the exhaust-gas recirculation system is arranged on that cylinder-head side which lies opposite the fresh-gas line and the exhaust-gas collection line. This arrangement away from the exhaust-gas collection line which is substantially hotter than other components during operation has the consequence of a direct reduction of the temperature of the recirculated exhaust-gas amount, without further special cooling measures being provided.

Description

Die Erfindung betrifft eine Brennkraftmaschine mit einem Kurbelgehäuse und einem einen Zylinder des Kurbelgehäuses abdeckenden Zylinderkopf, in den ein Frischgaskanal und ein Abgaskanal eingelassen sind, die auf einer Zylinderkopflängsseite münden und die mit jeweils einer Frischgasleitung und einer Abgassammelleitung verbunden sind, und wobei ein Abgasrückführsystem, bestehend aus einer Abgasrückführleitung und einem Steuerventil, vorhanden ist.The invention relates to an internal combustion engine with a crankcase and a cylinder of the crankcase covering cylinder head into which a fresh gas duct and an exhaust duct are inserted, which open on a cylinder head longitudinal side and which are each connected to a fresh gas line and an exhaust manifold, and wherein an exhaust gas recirculation system consisting from an exhaust gas recirculation line and a control valve, is present.

Eine derartige Brennkraftmaschine ist aus der DE 693 00 649 T2 bekannt. Diese Brennkraftmaschine weist einen Zylinderkopf auf, bei dem die Frischgaskanäle und die Abgaskanäle der einzelnen Zylinder auf einer Zylinderkopflängsseite des als Blockzylinderkopfs ausgebildeten Zylinderkopfs münden. Die Abgassammelleitung weist einen speziellen Anschluss für die Befestigung des Abgasrückführsystems, insbesondere eines Steuerventils zur Steuerung der zurückgeführten Abgasmenge, auf. Um das zurückzuführende Abgas in die Frischgaskanäle einzuleiten, ist zwischen diesen und der Frischgassammelleitung ein spezielles als Rampe bezeichnetes Bauteil eingesetzt. Nachteilig an dieser Ausbildung ist, dass die Abgassammelleitung geändert werden muss und die Bauhöhe der Brennkraftmaschine durch die Einfügung der Rampe erhöht wird. Weiterhin ragt insbesondere das Steuerventil über die gegebene seitliche Kontur der Brennkraftmaschine hinaus. Eine Kühlung des rückgeführten Abgases ist nicht vorgesehen und durch die unmittelbare Nähe zu der im Betrieb heißen Abgassammelleitung erschwert.Such an internal combustion engine is from the DE 693 00 649 T2 known. This internal combustion engine has a cylinder head, in which the fresh gas ducts and the exhaust ducts of the individual cylinders open on a cylinder head longitudinal side of the cylinder head designed as a block cylinder head. The exhaust manifold has a special connection for attaching the exhaust gas recirculation system, in particular a control valve for controlling the amount of recirculated exhaust gas on. In order to introduce the recirculated exhaust gas into the fresh gas ducts, a special component called a ramp is inserted between them and the fresh gas manifold. A disadvantage of this design is that the exhaust manifold must be changed and the height of the internal combustion engine is increased by the insertion of the ramp. Furthermore, in particular, the control valve protrudes beyond the given lateral contour of the internal combustion engine. Cooling of the recirculated exhaust gas is not provided and impeded by the immediate proximity to the hot exhaust manifold during operation.

Der Erfindung liegt die Aufgabe zugrunde, eine Brennkraftmaschine mit einem Abgasrückführsystem bereitzustellen, bei der das Abgasrückführsystem von der im Betrieb heißen Abgassammelleitung unbeeinflusst bleibt.The invention has for its object to provide an internal combustion engine with an exhaust gas recirculation system, in which the exhaust gas recirculation system is unaffected by the hot exhaust manifold during operation.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Abgasrückführsystem auf der der Frischgasleitung und der Abgassammelleitung gegenüberliegenden Zylinderkopfseite angeordnet ist. Diese Anordnung fern von der gegenüber anderen Bauteilen im Betrieb wesentlich heißeren Abgassammelleitung hat eine direkte Absenkung der Temperatur der zurückgeführten Abgasmenge zur Folge, ohne dass weitere spezielle Kühlmaßnahmen vorgesehen sind. Es handelt sich bei dem Zylinderkopf bevorzugt um einen Einzelzylinderkopf, der zusammen mit dem zugehörigen Zylinder auf dem Kurbelgehäuse verschraubt ist. Selbstverständlich ist die Erfindung auch bei einem Blockzylinderkopf und mit einstückig mit dem Kurbelgehäuse hergestellten Zylindern anwendbar.This object is achieved in that the exhaust gas recirculation system is disposed on the cylinder head side opposite the fresh gas line and the exhaust manifold. This arrangement far from the compared to other components in operation much hotter exhaust manifold has a direct reduction in the temperature of the recirculated exhaust gas result without further special cooling measures are provided. The cylinder head is preferably a single cylinder head, which is screwed together with the associated cylinder on the crankcase. Of course, the invention is also applicable to a block cylinder head and cylinders made in one piece with the crankcase.

In Weiterbildung der Erfindung sind in den Zylinderkopf jeweils mit dem Frischgaskanal und dem Abgaskanal verbundene auf der Zylinderkopfseite mündende Kanäle eingelassen (der Frischgaskanal und der Abgaskanal verbinden Gaswechselventile in dem Zylinderkopf mit der Frischgasleitung beziehungsweise mit der Abgassammelleitung). Die Kanäle, deren Querschnitt gegenüber den zuvor genannten Gaskanälen erheblich kleiner dimensioniert sein kann, können an geeigneter Stelle in dem Zylinderkopf angeordnet sein und bei der Herstellung des Zylinderkopfs mit eingegossen werden oder nachträglich durch eine mechanische Bearbeitung eingebracht werden. Bevorzugt werden diese Kanäle nachträglich durch eine mechanische Bearbeitung in den Zylinderkopf eingearbeitet, so dass der Zylinderkopfrohling für eine Brennkraftmaschinenversion mit oder ohne Abgasrückführung gleich ausgebildet sein kann. An diesen auf der Zylinderkopfseite mündenden Kanälen ist dann ein Abgasrückführsystem, bestehend aus einer Abgasrückführsammelleitung, einem Abgasrückführsteuerventil und einer Abgasrückführverteilleitung, einfach befestigbar. Dabei liegt ein weiterer Vorteil darin, dass die Abgassammelleitung gegenüber einer Ausführung ohne Abgasrückführung unverändert bleiben kann. Dies ist insbesondere dann besonders vorteilhaft, wenn für unterschiedliche Einsatzzwecke und Kundenwünsche verschiedenartige Abgassammelleitungen mit beispielsweise unterschiedlichen Anschlüssen zur Weiterführung der Abgase bereitgestellt werden. Weiterhin wird das für einen Einbau maßgebliche Bauvolumen der Brennkraftmaschine durch diese Ausgestaltung und Anordnung des Abgasrückführsystems nicht beeinflusst, so dass eine Unterscheidung einer Brennkraftmaschine mit Abgasrückführung und einer Brennkraftmaschine ohne Abgasrückführung unterbleiben kann. Dies ist besonders vorteilhaft hinsichtlich der Austauschbarkeit entsprechender beispielsweise in Baumaschinen oder landwirtschaftlichen Maschinen eingebauten Brennkraftmaschinen.In a further development of the invention are in the cylinder head respectively connected to the fresh gas duct and the exhaust duct on the cylinder head side channels embedded (the fresh gas duct and the exhaust duct connecting gas exchange valves in the cylinder head with the fresh gas line or with the exhaust manifold). The channels, whose cross-section relative to the aforementioned gas channels can be dimensioned considerably smaller, can be arranged at a suitable location in the cylinder head and be poured in the production of the cylinder head with or subsequently introduced by mechanical machining. Preferably, these channels are subsequently incorporated by mechanical processing in the cylinder head, so that the cylinder head blank for an engine version with or without exhaust gas recirculation can be the same. At this on the cylinder head side opening channels is then an exhaust gas recirculation system, consisting of an exhaust gas recirculation manifold, an exhaust gas recirculation control valve and a Abgasrückführverteilleitung, easy attachable. Another advantage is that the exhaust manifold can remain unchanged compared to a version without exhaust gas recirculation. This is particularly advantageous in particular when different types of exhaust manifolds with, for example, different connections for the continuation of the exhaust gases are provided for different purposes and customer requirements. Furthermore, the design volume of the internal combustion engine which is decisive for installation is not influenced by this configuration and arrangement of the exhaust gas recirculation system, so that a distinction between an internal combustion engine with exhaust gas recirculation and an internal combustion engine without exhaust gas recirculation can be omitted. This is particularly advantageous with regard to the interchangeability of corresponding internal combustion engines installed, for example, in construction machines or agricultural machines.

In Weiterbildung der Erfindung weist die Brennkraftmaschine ein Kühlluftgebläse auf und das Abgasrückführsystem ist direkt in dem von dem Kühlluftgebläse geförderten Kühlluftstrom innerhalb eines Kühlluftleitgehäuses angeordnet. Diese Anordnung ermöglicht zunächst einmal eine wirkungsvolle Kühlung des zurückgeführten Abgases ohne irgendwelchen weiteren Aufwand. Zum Weiteren kann das Abgasrückführsystem in einen Kühlluftleitkanal, der von einem Kühlluftleitgehäuse gebildet ist und entlang der Zylinderkopfseite angeordnet ist, integriert werden und stellt somit in jedem Fall keine über eine gegebene seitliche Kontur hinausragende Komponente dar, so dass sichergestellt ist, dass eine entsprechend mit einem Abgasrückführsystem ausgestattete Brennkraftmaschine zu der gleichen Brennkraftmaschine ohne ein Abgasrückführsystem ohne Weiteres austauschbar ist. Es handelt sich bei einer derartigen Brennkraftmaschine bevorzugt um eine luftgekühlte Brennkraftmaschine, es kann sich aber auch um eine Brennkraftmaschine mit einem kombinierten Kühlsystem handeln, wobei das Gebläse das Kühlmedium, beispielsweise Öl und/oder Wasser, kühlt und gegebenenfalls zusätzlich zur Luftkühlung des beispielsweise Zylinderkopfs und/oder eines Wärmetauschers herangezogen wird.In a development of the invention, the internal combustion engine has a cooling-air fan and the exhaust-gas recirculation system is arranged directly in the cooling-air flow conveyed by the cooling-air fan within a cooling air-conducting housing. This arrangement initially enables effective cooling of the recirculated exhaust gas without any further expense. Furthermore, the exhaust gas recirculation system can be integrated into a Kühlluftleitkanal, which is formed by a Kühlluftleitgehäuse and disposed along the cylinder head side, and thus in any case not over a given lateral contour protruding component, so as to ensure that one with a corresponding Exhaust gas recirculation system equipped internal combustion engine to the same internal combustion engine without an exhaust gas recirculation system is easily replaceable. It is in such an internal combustion engine is preferably an air-cooled internal combustion engine, but it can also be an internal combustion engine with a combined cooling system, wherein the fan cools the cooling medium, such as oil and / or water, and optionally used in addition to the air cooling of the example cylinder head and / or a heat exchanger.

In weiterer Ausgestaltung ist das Abgasrückführsteuerventil benachbart zu dem Kühlluftgebläse angeordnet, so dass dieses thermisch empfindliche Bauteil besonders wirkungsvoll und intensiv gekühlt wird. Schließlich kann zur Erhöhung der Kühlleistung das Abgasrückführsystem insbesondere eine Außenverrippung aufweisen, wobei diese Außenverrippung selbstverständlich strömungstechnisch optimiert in Richtung der Kühlluftströmung ausgerichtet sein kann.In a further embodiment, the exhaust gas recirculation control valve is arranged adjacent to the cooling air blower, so that this thermally sensitive component is cooled particularly effectively and intensively. Finally, in order to increase the cooling capacity, the exhaust gas recirculation system may in particular have an external ribbing, wherein this external ribbing can, of course, be aligned in the direction of the cooling air flow in an optimized manner in terms of flow.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in den Figuren dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist.Further advantageous embodiments of the invention are described in the drawings, in which an illustrated in the figures embodiment of the invention is described in detail.

Es zeigen:

Fig. 1
eine perspektivische Ansicht einer Brennkraftmaschine mit geöffnetem Kühlluftleitgehäuse,
Fig. 2
einen Querschnitt durch einen Zylinderkopf gemäß Fig. 1 im Bereich eines Kanals.
Show it:
Fig. 1
a perspective view of an internal combustion engine with an open Kühlluftleitgehäuse,
Fig. 2
a cross section through a cylinder head according to Fig. 1 in the area of a canal.

Die Brennkraftmaschine gemäß Fig. 1 weist ein Kurbelgehäuse 1 auf, das bodenseits von einer Ölwanne 2 verschlossen ist. Auf das Kurbelgehäuse 1 sind gegenüberliegend zu der Ölwanne 2 Zylinderrohre aufgesetzt, die wiederum von Zylinderköpfen 3 abgedeckt sind. Bei dem Ausführungsbeispiel handelt es sich um eine 4-zylindrige Brennkraftmaschine, so dass insgesamt vier Zylinderrohre und vier Zylinderköpfe 3 verbaut sind. Darüber hinaus ist die Brennkraftmaschine luftgekühlt und dementsprechend sind die Zylinderrohre und die Zylinderköpfe 3 mit Kühlrippen 4 versehen.The internal combustion engine according to Fig. 1 has a crankcase 1, which is closed on the bottom side of an oil pan 2. On the crankcase 1 2 cylinder tubes are placed opposite to the oil pan, which in turn are covered by cylinder heads 3. In the embodiment, it is a 4-cylinder internal combustion engine, so that a total of four cylinder tubes and four cylinder heads 3 are installed. In addition, the internal combustion engine air-cooled and accordingly, the cylinder tubes and the cylinder heads 3 are provided with cooling fins 4.

Stirnseitig der Brennkraftmaschine ist an einer in dem Kurbelgehäuse 1 gelagerten Kurbelwelle ein Zweifachriemenrad 5 befestigt, das über einen ersten Keilriemen 6a mit einem Generator 7 und über einen zweiten Keilriemen 6b unter Einschaltung einer Spannrolle 8 mit einem Kühlluftgebläse 9 antriebsverbunden ist.On the front side of the internal combustion engine, a double belt wheel 5 is fastened to a crankshaft mounted in the crankcase 1, which is drive-connected via a first belt 6a to a generator 7 and via a second belt 6b with the intervention of a tensioning roller 8 with a cooling-air fan 9.

Das Kühlluftgebläse 9 ist seitlich oberhalb des Kurbelgehäuses 1 im Wesentlichen im Bereich neben den Zylinderrohren und den Zylinderköpfen 3 angeordnet und fördert aus der Umgebung angesaugte Kühlluft in ein Kühlluftleitgehäuse 10, das sich von dem Kühlluftgebläse 9 bis zu einem gegenüberliegenden schwungradseitigen Ende 11 der Brennkraftmaschine erstreckt und die geförderte Kühlluft quer durch die Brennkraftmaschine entlang den Zylinderrohren und den Zylinderköpfen 3 verteilt. In der Fig. 1 ist ein Wartungsdeckel des Kühlluftleitgehäuses 10 abgenommen und im Bereich des Kühlluftgebläses 9 das Kühlluftleitgehäuse 10° teilweise aufgeschnitten dargestellt, so dass ein Einblick in das Innere des Kühlluftleitgehäuses 10 gegeben ist.The cooling air blower 9 is arranged laterally above the crankcase 1 substantially in the area adjacent to the cylinder tubes and the cylinder heads 3 and promotes from the environment sucked cooling air into a Kühlluftleitgehäuse 10, which extends from the cooling air blower 9 to an opposite flywheel end 11 of the internal combustion engine and the subsidized cooling air distributed across the internal combustion engine along the cylinder tubes and the cylinder heads 3. In the Fig. 1 a maintenance cover of the Kühlluftleitgehäuses 10 is removed and shown in the region of the cooling air blower 9, the Kühlluftleitgehäuse 10 ° partially cut, so that an insight into the interior of the Kühlluftleitgehäuses 10 is given.

Unterhalb des Kühlluftleitgehäuses 10 ist eine Reiheneinspritzpumpe 12 angebaut, die über unterbrochen dargestellte Einspritzleitungen 13a, 13b mit in den Zylinderköpfen 3 eingesetzten Kraftstoffeinspritzventilen verbunden ist. Jedes Kraftstoffeinspritzventil ist mittels Spannpratzen 14 an dem Zylinderkopf befestigt und schließt seitlich an einen Ventildeckel 15 an, der sich bis an eine gegenüberliegende Zylinderkopflängsseite zu der kühlluftleitgehäuseseitigen Zylinderkopfseite erstreckt. Auf dieser Zylinderkopflängsseite sind eine Frischgasleitung 16 und eine Abgassammelleitung 17 angeordnet. Im Bereich oberhalb, zwischen und unterhalb der Frischgasleitung 16 und der Abgassammelleitung 17 strömt ein wesentlicher Teil der von dem Kühlluftgebläse 9 geförderten Kühlluft wieder in die Umgebung.Below the Kühlluftleitgehäuses 10 a row injection pump 12 is attached, which is connected via interrupted injection lines shown 13 a, 13 b used in the cylinder heads 3 fuel injection valves. Each fuel injection valve is secured by means of clamping claws 14 on the cylinder head and connects laterally to a valve cover 15, which extends to an opposite cylinder head longitudinal side to the cool air side housing side cylinder head. On this cylinder head longitudinal side, a fresh gas line 16 and an exhaust manifold 17 are arranged. In the area above, between and below the fresh gas line 16 and the exhaust manifold 17, a substantial part of the cooling air conveyed by the cooling air blower 9 flows back into the environment.

Die in den Zylindern zwischen den einzelnen Zylinderköpfen 3 und den jeweils in den Zylindern auf und ab bewegbaren Kolben liegenden Brennräume sind über Gaswechselventile und Gaswechselkanäle jeweils mit der Frischgasleitung 16 und der Abgassammelleitung 17 strömungsverbunden. Auf der gegenüberliegenden Zylinderkopfseite sind in die Zylinderköpfe 3 Kanäle 18a, 18b (Fig. 2) eingearbeitet, von denen ein Kanal 18a mit einem Gaswechselauslasskanal und der Kanal 18b mit einem Gaswechseleinlasskanal nebeneinanderliegend verbunden ist. Diese Kanäle 18a, 18b sind in einem unteren Bereich des Zylinderkopfs 3 auf die kühlluftgebläseseitige Zylinderkopfseite geführt und mit passenden Verbindungseinrichtung 19a, 19b versehen.The combustion chambers located in the cylinders between the individual cylinder heads 3 and the pistons movable up and down in the cylinders are flow-connected via gas exchange valves and gas exchange ducts to the fresh gas line 16 and the exhaust manifold 17, respectively. On the opposite cylinder head side 3 channels 18a, 18b are in the cylinder heads ( Fig. 2 ), of which one channel 18a is connected to a gas exchange outlet channel and the channel 18b is connected side by side to a gas exchange inlet channel. These channels 18a, 18b are guided in a lower portion of the cylinder head 3 on the cooling air fan side cylinder head side and provided with mating connection means 19a, 19b.

In dem Kühlluftleitgehäuse 10 ist ein Abgasrückführsystem angeordnet, das die Kanäle 18a steuer- bzw. regelbar mit den Kanälen 18b verbindet. Dazu sind die Kanäle 18a mit einer gemeinsamen Sammelleitung 20 verschaltet, die im Bereich des schwungradseitigen Endes 11 über einen Bogen 21 in eine Zufuhrleitung 22 zu einem Abgasrückführsteuerventil 23 weitergeführt ist. Auf der gegenüberliegenden Seite zu der Zufuhrleitung 22 ist an das Abgasrückführsteuerventil 23 ein Umlenkbogen 24 angeschlossen, der sich in eine Verteilleitung 25 fortsetzt, die angenähert parallel unterhalb der Sammelleitung 20 angeordnet ist und die wiederum mit den Kanälen 18b der einzelnen Zylinderköpfe 3 verbunden ist.In the Kühlluftleitgehäuse 10, an exhaust gas recirculation system is arranged, the channels 18 a controllably connected or controllably connected to the channels 18 b. For this purpose, the channels 18a are connected to a common bus 20, which is continued in the region of the flywheel-side end 11 via a sheet 21 in a supply line 22 to an exhaust gas recirculation control valve 23. On the opposite side to the supply line 22, a deflecting bend 24 is connected to the exhaust gas recirculation control valve 23, which continues in a distribution line 25, which is arranged approximately parallel below the manifold 20 and which in turn is connected to the channels 18b of the individual cylinder heads 3.

Das gesamte Abgasrückführsystem ist innerhalb des Kühlluftleitgehäuses 10 angeordnet und ist somit bei geschlossenem Kühlluftleitgehäuse von außen einerseits nicht sichtbar und andererseits beeinflusst es die äußeren Abmessungen der Brennkraftmaschine nicht. Weiterhin erfolgt durch die Anordnung der Abgasrückführeinrichtung komplett innerhalb des Kühlluftleitgehäuses 10 eine wirkungsvolle Kühlung der Bauteile des Abgasrückführsystems. Die einzelnen Leitungen und Bögen sowie das Abgasrückführsteuerventilgehäuse können zur Erhöhung des Wärmeübertrages auch noch zusätzlich mit innenseitigen und/oder außenseitigen Kühlrippen versehen sein.The entire exhaust gas recirculation system is disposed within the Kühlluftleitgehäuses 10 and is therefore not visible with the Kühlluftleitgehäuse closed from the outside on the one hand and on the other hand, it does not affect the outer dimensions of the internal combustion engine. Furthermore, by the arrangement of the exhaust gas recirculation device completely within the Kühlluftleitgehäuses 10 effective cooling of the components of the exhaust gas recirculation system. The individual lines and bends as well as the exhaust gas recirculation control valve housing can also be additionally provided with inside and / or outside cooling fins to increase the heat transfer.

Die Reiheneinspritzpumpe 12 ist mit einem Regler ausgestattet, der als mechanischer Regler ausgebildet ist. Um das Abgasrückführsteuerventil 23 ohne komplizierte und aufwendige elektronische Steuereinrichtung betätigen zu können, wird die Stellung einer in der Reiheneinspritzpumpe 12 vorhandenen Regelstange kontaktlos abgegriffen und diese Stellung zur Steuerung des Abgasrückführsteuerventils 23 über eine mechanische oder elektrische Übertragungseinrichtung herangezogen.The in-line injection pump 12 is equipped with a regulator, which is designed as a mechanical regulator. In order to operate the exhaust gas recirculation control valve 23 without complicated and expensive electronic control device, the position of an existing in the series injection pump 12 control rod is tapped contactless and used this position to control the exhaust gas recirculation control valve 23 via a mechanical or electrical transmission device.

Hierzu wertet eine elektrische Steuerung ein Regelstangenwegsignal aus. Dabei kommt bevorzugt ein Hallsensor zum Einsatz, der über einen oder mehrere in die Regelstange integrierte Magnete geschaltet wird. Ein solcher Hallsensor ist ein sehr zuverlässiger elektrischer Schalter, mit dem die Abgasrückführung ein- und ausgeschaltet werden kann. Dabei wird in weiterer Ausgestaltung der Erfindung die Abgasrückführung oberhalb einer Einspritzmenge, die einer Last größer als drei Viertel der Volllast entspricht, ausgeschaltet. In diesem Volllastbereich wird kein Abgas zurückgeführt, da in dem Volllastbereich eine Abgasrückführung zu einer Verschlechterung der Abgasemissionen führen würde. Hierzu sind in einer bevorzugten Ausführungsform in den Bereich der Regelstange, der diesen Einspritzmengenbereich abdeckt, mehrere kleine Magnete nebeneinander liegend in Bohrungen eingesetzt. Diese Magnete schalten den außen an das Pumpengehäuse der Einspritzvorrichtung angebrachten Hallsensor. Dieses Verfahren bzw. diese Ausgestaltung ist extrem zuverlässig, da es sich bei dieser elektrischen Steuerung ausdrücklich nicht um eine elektronische Steuereinrichtung handelt.For this purpose, an electrical controller evaluates a control rod travel signal. In this case, preferably a Hall sensor is used, which is connected via one or more integrated into the control rod magnets. Such a Hall sensor is a very reliable electrical switch with which the exhaust gas recirculation can be switched on and off. In this case, in a further embodiment of the invention, the exhaust gas recirculation above an injection quantity corresponding to a load greater than three quarters of the full load turned off. In this full load range, no exhaust gas is recirculated, since in the full load range exhaust gas recirculation would lead to a deterioration of exhaust emissions. For this purpose, in a preferred embodiment, in the region of the control rod which covers this injection quantity range, a plurality of small magnets are inserted next to one another in bores. These magnets switch the outside mounted on the pump housing of the injector Hall sensor. This method or this embodiment is extremely reliable, since this electrical control is expressly not an electronic control device.

In weiterer Ausgestaltung der Erfindung wird die Abgasrückführung bei einer Drehzahl unterhalb einer erhöhten Leerlaufdrehzahl ausgeschaltet. Diese Schaltfunktion ist dann vorgesehen, wenn mit geringer werdenden Drehzahlen, beispielsweise unterhalb einer Grenzdrehzahl von 1500 U/min, die Gefahr besteht, dass bei einer Abgasrückführung durch die Auslegung des Einspritzsystems Rauchprobleme auftreten können. Zu diesem Zweck ist ein induktiver Drehzahlschalter vorgesehen, der ebenfalls an dem Pumpengehäuse angebaut wird und unterhalb insbesondere einer Drehzahl von 1450 U/min das gewünschte Schaltsignal abgibt.In a further embodiment of the invention, the exhaust gas recirculation is turned off at a speed below an increased idle speed. This switching function is provided when with decreasing speeds, for example below a limit speed of 1500 rev / min, there is a risk that smoke problems may occur in an exhaust gas recirculation through the design of the injection system. For this purpose, an inductive speed switch is provided, which is also mounted on the pump housing and below in particular a speed of 1450 revolutions / min outputs the desired switching signal.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Kurbelgehäusecrankcase
22
Ölwanneoil pan
33
Zylinderkopfcylinder head
44
Kühlrippecooling fin
55
ZweifachriemenradZweifachriemenrad
6a, 6b6a, 6b
Keilriemenfan belt
77
Generatorgenerator
88th
Spannrolleidler
99
KühlluftgebläseCooling fan
1010
KühlluftleitgehäuseKühlluftleitgehäuse
1111
schwungradseitiges Endeflywheel end
1212
ReiheneinspritzpumpeLine pump
13a, 13b13a, 13b
EinspritzleitungInjection line
1414
Spannpratzeclamping shoe
1515
Ventildeckelvalve cover
1616
FrischgasleitungFresh gas line
1717
AbgassammelleitungExhaust manifold
18a, 18b18a, 18b
Kanalchannel
19a, 19b19a, 19b
Verbindungseinrichtungconnecting device
2020
Sammelleitungmanifold
2121
Bogenbow
2222
Zufuhrleitungsupply line
2323
AbgasrückführsteuerventilExhaust gas recirculation control valve
2424
Umlenkbogenreversing curve
2525
Verteilleitungdistribution line

Claims (5)

  1. Internal combustion engine having a crankcase (1) and having a cylinder head (3) which covers a cylinder of the crankcase, into which cylinder head (3) are formed a fresh-gas duct and an exhaust-gas duct which open out at a cylinder-head longitudinal side and which are connected to in each case one fresh-gas line (16) and one exhaust-gas collecting line (17), and with an exhaust-gas recirculation system which is composed of an exhaust-gas recirculation line (20, 21, 22) and a control valve (23) being provided,
    characterized in that the exhaust-gas recirculation system is arranged on that side of the cylinder head which is opposite the fresh-gas line (16) and the exhaust-gas collecting line (17).
  2. Internal combustion engine according to Claim 1,
    characterized in that ducts (18a, 18b) which are connected in each case to the fresh-gas duct and to the exhaust-gas duct and which open out at the cylinder head side are formed into the cylinder head (3).
  3. Internal combustion engine according to Claim 1 or Claim 2,
    characterized in that the internal combustion engine has a cooling-air fan (9) and in that the exhaust-gas recirculation system is arranged directly in the cooling-air flow, which is fed by the cooling-air fan (9), within a cooling-air guiding housing (10).
  4. Internal combustion engine according to Claim 3,
    characterized in that the exhaust-gas recirculation control valve (23) is arranged adjacent to the cooling-air fan (9).
  5. Internal combustion engine according to one of the preceding claims, characterized in that the exhaust-gas recirculation system has an internal/external arrangement of fins.
EP06829229A 2005-12-08 2006-12-01 Exhaust-gas recirculation in an air-cooled internal combustion engine Not-in-force EP1957785B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005059007A DE102005059007A1 (en) 2005-12-08 2005-12-08 Exhaust gas recirculation in an air-cooled internal combustion engine
PCT/EP2006/011545 WO2007065601A1 (en) 2005-12-08 2006-12-01 Exhaust-gas recirculation in an air-cooled internal combustion engine

Publications (2)

Publication Number Publication Date
EP1957785A1 EP1957785A1 (en) 2008-08-20
EP1957785B1 true EP1957785B1 (en) 2009-02-18

Family

ID=37814354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06829229A Not-in-force EP1957785B1 (en) 2005-12-08 2006-12-01 Exhaust-gas recirculation in an air-cooled internal combustion engine

Country Status (5)

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US (1) US7832384B2 (en)
EP (1) EP1957785B1 (en)
AT (1) ATE423272T1 (en)
DE (2) DE102005059007A1 (en)
WO (1) WO2007065601A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007054954A1 (en) * 2007-11-17 2009-05-20 Deutz Ag Self-igniting internal-combustion engine i.e. four-cylinder air-cooled self-igniting internal-combustion engine, has common rail system arranged on cooling fan long side of engine, and rail inserted into cooling air space
KR101802223B1 (en) * 2010-04-30 2017-11-28 얀마 가부시키가이샤 Engine
JP5754914B2 (en) * 2010-10-26 2015-07-29 ダイハツ工業株式会社 Internal combustion engine
FR2973445B1 (en) * 2011-03-31 2015-08-21 Valeo Systemes Thermiques INTAKE GAS DISTRIBUTION BOX IN AN ENGINE, IN PARTICULAR A MOTOR VEHICLE, AND A GAS SUPPLY MODULE COMPRISING SAID HOUSING
EP3414056B1 (en) 2016-02-08 2023-08-30 Swimc Llc Folding tool

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Publication number Priority date Publication date Assignee Title
JPS5552049Y2 (en) * 1976-01-31 1980-12-03
JPS5337232A (en) 1976-09-17 1978-04-06 Toyota Motor Corp Recirculating device of exhaust gas for internal combustion engine
JPS55107019A (en) 1979-02-08 1980-08-16 Yamaha Motor Co Ltd Intake device for engine
DE2939708A1 (en) 1979-09-29 1981-04-16 Robert Bosch Gmbh, 7000 Stuttgart Catalytic reactor for IC engine exhaust - has heated connecting section to engine inlet manifold preventing fuel condensing when cold
US4271810A (en) * 1980-01-11 1981-06-09 General Motors Corporation Divided chamber engine with prechamber exhaust recirculation
JPS5949755U (en) * 1982-09-27 1984-04-02 本田技研工業株式会社 internal combustion engine
FR2689936B1 (en) 1992-04-09 1994-07-08 Peugeot INTEGRATED RAMP DEVICE FOR THE RECYCLING OF EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE.
US6386154B1 (en) * 2000-06-12 2002-05-14 The United States Of America As Represented By The Administrator Of The Environmental Protection Agency Pumped EGR system
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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

Also Published As

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DE502006002917D1 (en) 2009-04-02
ATE423272T1 (en) 2009-03-15
US20090139501A1 (en) 2009-06-04
DE102005059007A1 (en) 2007-07-05
WO2007065601A1 (en) 2007-06-14
US7832384B2 (en) 2010-11-16
EP1957785A1 (en) 2008-08-20

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