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EP2331803A1 - Two-stage cooled exhaust gas recirculation system - Google Patents

Two-stage cooled exhaust gas recirculation system

Info

Publication number
EP2331803A1
EP2331803A1 EP09778787A EP09778787A EP2331803A1 EP 2331803 A1 EP2331803 A1 EP 2331803A1 EP 09778787 A EP09778787 A EP 09778787A EP 09778787 A EP09778787 A EP 09778787A EP 2331803 A1 EP2331803 A1 EP 2331803A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
stage
line
gas recirculation
exhaust
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.)
Granted
Application number
EP09778787A
Other languages
German (de)
French (fr)
Other versions
EP2331803B1 (en
Inventor
Bernd Hülsmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutz AG
Original Assignee
Deutz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Deutz AG filed Critical Deutz AG
Publication of EP2331803A1 publication Critical patent/EP2331803A1/en
Application granted granted Critical
Publication of EP2331803B1 publication Critical patent/EP2331803B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust 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
    • F02M26/22—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
    • F02M26/24—Layout, e.g. schematics with two or more coolers
    • 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
    • F02M26/44—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 in which a main EGR passage is branched into multiple passages
    • 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
    • F02M26/38—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in parallel
    • 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
    • F02M26/39—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in series
    • 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
    • F02M26/43—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 in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor

Definitions

  • the invention relates to a device for the cooled recirculation of exhaust gas of an internal combustion engine charged by means of an exhaust gas turbocharger, wherein the internal combustion engine has a fresh gas system and an exhaust system, which are connected via an exhaust gas recirculation line with two-stage exhaust gas cooler.
  • an exhaust gas recirculation line branches off from the exhaust pipe behind the turbine of an exhaust gas turbocharger and via its own compressor, the recirculated exhaust gas is raised to a higher pressure level and introduced into the fresh air line behind a charge air cooler.
  • the invention has for its object to provide a device with which a simple amount of sufficient exhaust gas can be recycled.
  • the exhaust gas recirculation line is connected to an exhaust manifold of the exhaust system in the flow direction in front of the turbine of the exhaust gas turbocharger that in the exhaust gas recirculation line before the first stage of the exhaust gas cooler, an exhaust gas recirculation valve is turned on and that in a continuation line to the second stage of the exhaust gas cooler Check valve is used.
  • This embodiment eliminates the need for a complex internal compressor for the recirculated exhaust gas, and the use of the non-return valve makes it possible to control the pressure pulsations prevailing in the exhaust system. Used position sufficient exhaust gas recirculation rate.
  • An essential aspect for achieving the required return rates is the arrangement of the check valve between the first stage of the exhaust gas cooler and the second stage of the exhaust gas cooler.
  • the exhaust gas recirculation line to the first stage of the exhaust gas cooler is formed in two columns with two switched exhaust gas recirculation valves. Together with the two-flow design of the first stage of the exhaust gas cooler and also the continuation line with an associated non-return valve provided in a further embodiment, small volumes are realized up to the check valves, which are used to maintain and exploit the pulsations in the exhaust gas flow. This effect is exploited even further when the exhaust manifold, also designed in a double-flow, each with an equal number of adjacent cylinders and separate entry into the turbine of the exhaust gas turbocharger is connected. As a result, pulsations in the exhaust gas flow are selectively continued to the check valves.
  • the washersleitun- be merged behind the check valves to a single-flow line and this line opens while flowing through the second stage of the exhaust gas cooler in the fresh gas line of the internal combustion engine.
  • An internal combustion engine shown schematically in the exemplary embodiment is a six-cylinder, self-igniting internal combustion engine in a series construction, which has a fresh gas system and an exhaust system.
  • the fresh gas system has a charge air line 2, which connects all intake ports of the individual cylinders with each other and via a charge air cooler 3 to the compressor 4 of an exhaust gas turbocharger 5.
  • the associated turbine 6 of the exhaust gas turbocharger 5 is driven by the exhaust gases of the internal combustion engine, the exhaust gases from the exhaust ports in the cylinder head of the internal combustion engine 1 via exhaust manifolds 7 a, 7 b are led to two separate inlets into the turbine 6.
  • the two exhaust manifolds 7a, 7b are each associated with three adjacent cylinders of the internal combustion engine.
  • Exhaust gas recirculation lines 8a, 8b branch off from the exhaust manifolds 7a, 7b and remove exhaust gas from the exhaust manifolds 7a, 7b and via exhaust recirculation valves 9a, 9b respectively connected to exhaust gas recirculation lines 9a, 9b of the first stage 10a, 10b of a two-stage exhaust gas cooler. From the respective first stage 10a, 10b of the exhaust gas cooler, the cooled exhaust gas passes via check valves 11a, 11b inserted into continuation lines 12a, 12b directly behind the first stage 10a, 10b into a single-flow return line 13.
  • the return line 13 forwards the recirculated exhaust gas over the second stage 14 of the exhaust gas
  • the first stage 10a, 10b of the exhaust gas cooler is, like the second stage 14, water-cooled, but it can also be provided, in particular to cool the second stage with cooling air.
  • the first stage 10a, 10b cools the exhaust gas to temperatures ⁇ 180 ° C. and the second stage cools to a temperature in the range of 70 ° C. or lower, depending on the temperature of the cooling water of the low-temperature circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Supercharger (AREA)

Abstract

The invention relates to a device for the cooled recirculation of exhaust gas of an internal combustion engine charged by means of an exhaust gas turbocharger, wherein the internal combustion engine has a fresh gas system and an exhaust gas system, which are connected to a two-stage exhaust gas cooler by an exhaust gas recirculation line. According to the invention, a device is provided by way of which a sufficient amount of exhaust gas may be recirculated using simple means. This is achieved in that the exhaust gas recirculation line 8a, 8b is switched to an exhaust gas collector line 7a, 7b of the exhaust gas system in the flow direction upstream of the turbine 6 of the exhaust gas turbocharger 5, an exhaust gas recirculation valve 9a, 9b is switched on in the exhaust gas recirculation line 8a, 8b upstream of the first stage 10a, 10b of the exhaust gas cooler, and a check valve 11a, 11b is inserted in a forwarding line 12a, 12b to the second stage of the exhaust gas cooler.

Description

Zweistufig gekühltes Abgasrückführsystem Two-stage cooled exhaust gas recirculation system
B E S C H R E I B U N GDESCRIPTION
Die Erfindung betrifft eine Vorrichtung zur gekühlten Rückführung von Abgas einer mittels eines Abgasturboladers aufgeladenen Brennkraftmaschine, wobei die Brennkraftmaschine ein Frischgassystem und ein Abgassystem aufweist, die über eine Abgasrückführleitung mit zweistufigem Ab- gaskühler verbunden sind.The invention relates to a device for the cooled recirculation of exhaust gas of an internal combustion engine charged by means of an exhaust gas turbocharger, wherein the internal combustion engine has a fresh gas system and an exhaust system, which are connected via an exhaust gas recirculation line with two-stage exhaust gas cooler.
Eine derartige Vorrichtung ist aus der DE 10 2005 017 905 A1 bekannt. Bei dem in diesem Dokument dargestellten System zweigt eine Abgasrückführleitung von der Abgasleitung hinter der Turbine eines Abgasturboladers ab und über einen eigenen Verdichter wird das zurückzuführende Abgas auf ein höheres Druckniveau angehoben und in die Frischluftleitung hinter einem Ladeluftkühler eingeleitet.Such a device is known from DE 10 2005 017 905 A1. In the system shown in this document, an exhaust gas recirculation line branches off from the exhaust pipe behind the turbine of an exhaust gas turbocharger and via its own compressor, the recirculated exhaust gas is raised to a higher pressure level and introduced into the fresh air line behind a charge air cooler.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung bereitzustellen, mit der mit einfachen Mitteln eine genügende Menge Abgas zurückgeführt werden kann.The invention has for its object to provide a device with which a simple amount of sufficient exhaust gas can be recycled.
Diese Aufgabe wird dadurch gelöst, dass die Abgasrückführleitung mit einer Abgassammelleitung des Abgassystems in Strömungsrichtung vor der Turbine des Abgasturboladers verschaltet ist, dass in der Abgasrückführleitung vor der ersten Stufe des Abgaskühlers ein Abgasrückführventil eingeschaltet ist und dass in einer Weiterführungsleitung zu der zweiten Stufe des Abgaskühlers ein Rückschlagventil eingesetzt ist. Durch diese Ausgestaltung wird ein aufwendiger eigener Verdichter für das zurück- geführte Abgas entbehrlich und durch den Einsatz des Rückschlagventils werden die in dem Abgassystem herrschenden Druckpulsationen zur Dar- Stellung einer ausreichenden Abgasrückführrate ausgenutzt. Dabei ist ein wesentlicher Aspekt zur Erreichung der geforderten Rückführraten die Anordnung des Rückschlagventils zwischen der ersten Stufe des Abgaskühlers und der zweiten Stufe des Abgaskühlers. Diese Anordnung nutzt die an dieser Stelle ausgeprägte Pulsation des Abgases zu einer Realisierung einer gewünschten Abgasrückführrate bei allen Betriebszuständen und Betriebsbedingungen der Brennkraftmaschine aus. Eine Anordnung des Rückschlagventils hinter der zweiten Stufe des Abgaskühlers würde zu geringeren Rückführraten führen, da aufgrund der vorhandenen Leitungs- und Kühler-Volumina bis zu dieser Stelle die Pulsation deutlich abgebaut ist. Zusätzlich ist durch Versuche herausgefunden worden, dass sich durch die Massenträgheit der größeren Abgasrückführungsmasse im Abgasrück- führsystem im Dynamikbetrieb das Ansprechverhalten der Brennkraftmaschine und die Regelbarkeit der Abgasrückführrate verschlechtert. Schließlich steigt bei relativ tiefen Temperaturen hinter der zweiten Stufe des Abgaskühlers die Verkokungsneigung des Rückschlagventils. Diese Nachteile werden durch die erfindungsgemäße Verschaltung des Rückschlagventils zwischen der ersten Stufe des Abgaskühlers und der zweiten Stufe des Abgaskühlers vermieden. Besonders vorteilhaft ist hier eine Anordnung des Rückschlagventils direkt an dem Ausgang der ersten Stufe des Abgaskühlers.This object is achieved in that the exhaust gas recirculation line is connected to an exhaust manifold of the exhaust system in the flow direction in front of the turbine of the exhaust gas turbocharger that in the exhaust gas recirculation line before the first stage of the exhaust gas cooler, an exhaust gas recirculation valve is turned on and that in a continuation line to the second stage of the exhaust gas cooler Check valve is used. This embodiment eliminates the need for a complex internal compressor for the recirculated exhaust gas, and the use of the non-return valve makes it possible to control the pressure pulsations prevailing in the exhaust system. Used position sufficient exhaust gas recirculation rate. An essential aspect for achieving the required return rates is the arrangement of the check valve between the first stage of the exhaust gas cooler and the second stage of the exhaust gas cooler. This arrangement makes use of the pronounced pulsation of the exhaust gas at this point to realize a desired exhaust gas recirculation rate under all operating conditions and operating conditions of the internal combustion engine. An arrangement of the check valve behind the second stage of the exhaust gas cooler would lead to lower return rates, since due to the existing line and cooler volumes up to this point, the pulsation is significantly reduced. In addition, it has been found by experiments that deteriorates the inertia of the larger exhaust gas recirculation mass in the exhaust gas recirculation system in the dynamic mode, the response of the internal combustion engine and the controllability of the exhaust gas recirculation rate. Finally, at relatively low temperatures behind the second stage of the exhaust gas cooler, the coking tendency of the check valve increases. These disadvantages are avoided by the inventive interconnection of the check valve between the first stage of the exhaust gas cooler and the second stage of the exhaust gas cooler. Particularly advantageous here is an arrangement of the check valve directly at the outlet of the first stage of the exhaust gas cooler.
In Weiterbildung der Erfindung ist die Abgasrückführleitung zu der ersten Stufe des Abgaskühlers zweiflutig mit zwei eingeschalteten Abgasrückführ- ventilen ausgebildet. Zusammen mit der in weiterer Ausgestaltung vorgesehenen zweiflutigen Ausgestaltung der ersten Stufe des Abgaskühlers und auch der Weiterführungsleitung mit jeweils einem zugeordneten Rückschlagventil, werden bis zu den Rückschlagventilen kleine Volumina realisiert, die zu einer Aufrechterhaltung und Ausnutzung der Pulsationen in der Abgasströmung genutzt werden. Dieser Effekt wird noch weiter ausgenutzt, wenn die Abgassammelleitung, ebenfalls zweiflutig ausgestaltet, mit jeweils einer gleichen Anzahl nebeneinander liegender Zylinder und voneinander getrennten Einlaufen in die Turbine des Abgasturboladers verschaltet ist. Dadurch werden Pulsationen in dem Abgasstrom gezielt zu den Rückschlagventilen weitergeführt.In a further development of the invention, the exhaust gas recirculation line to the first stage of the exhaust gas cooler is formed in two columns with two switched exhaust gas recirculation valves. Together with the two-flow design of the first stage of the exhaust gas cooler and also the continuation line with an associated non-return valve provided in a further embodiment, small volumes are realized up to the check valves, which are used to maintain and exploit the pulsations in the exhaust gas flow. This effect is exploited even further when the exhaust manifold, also designed in a double-flow, each with an equal number of adjacent cylinders and separate entry into the turbine of the exhaust gas turbocharger is connected. As a result, pulsations in the exhaust gas flow are selectively continued to the check valves.
In weiterer Ausgestaltung der Erfindung werden die Weiterführungsleitun- gen hinter den Rückschlagventilen zu einer einflutigen Leitung zusammengeführt und diese Leitung mündet unter Durchströmung der zweiten Stufe des Abgaskühlers in die Frischgasleitung der Brennkraftmaschine ein.In a further embodiment of the invention, the Weiterführungsleitun- be merged behind the check valves to a single-flow line and this line opens while flowing through the second stage of the exhaust gas cooler in the fresh gas line of the internal combustion engine.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungs- beschreibung zu entnehmen, in der ein in der Figur dargestelltes Ausführungsbeispiel näher beschrieben ist.Further advantageous embodiments of the invention are described in the drawings, in which an embodiment shown in the figure is described in detail.
Eine in dem Ausführungsbeispiel schematisch dargestellte Brennkraftmaschine ist eine 6-zylindrige selbstzündende Brennkraftmaschine in Reihen- bauart, die ein Frischgassystem und ein Abgassystem aufweist. Das Frischgassystem weist eine Ladeluftleitung 2 auf, die alle Einlasskanäle der einzelnen Zylinder miteinander und über einen Ladeluftkühler 3 mit dem Verdichter 4 eines Abgasturboladers 5 verbindet. Die zugehörige Turbine 6 des Abgasturboladers 5 wird von den Abgasen der Brennkraftma- schine angetrieben, wobei die Abgase von den Auslasskanälen im Zylinderkopf der Brennkraftmaschine 1 über Abgassammelleitungen 7a, 7b zu zwei getrennten Einlaufen in die Turbine 6 geführt sind. Die beiden Abgassammelleitungen 7a, 7b sind jeweils drei nebeneinander liegenden Zylindern der Brennkraftmaschine zugeordnet.An internal combustion engine shown schematically in the exemplary embodiment is a six-cylinder, self-igniting internal combustion engine in a series construction, which has a fresh gas system and an exhaust system. The fresh gas system has a charge air line 2, which connects all intake ports of the individual cylinders with each other and via a charge air cooler 3 to the compressor 4 of an exhaust gas turbocharger 5. The associated turbine 6 of the exhaust gas turbocharger 5 is driven by the exhaust gases of the internal combustion engine, the exhaust gases from the exhaust ports in the cylinder head of the internal combustion engine 1 via exhaust manifolds 7 a, 7 b are led to two separate inlets into the turbine 6. The two exhaust manifolds 7a, 7b are each associated with three adjacent cylinders of the internal combustion engine.
Von den Abgassammelleitungen 7a, 7b zweigen Abgasrückführleitungen 8a, 8b ab, die Abgas aus den Abgassammelleitungen 7a, 7b entnehmen und über jeweils in den Abgasrückführleitungen 8a, 8b eingeschalteten Ab- gasrückführventilen 9a, 9b der ersten Stufe 10a, 10b eines zweistufigen Abgaskühlers zuführen. Aus der jeweils ersten Stufe 10a, 10b des Abgaskühlers gelangt das gekühlte Abgas über direkt hinter der ersten Stufe 10a, 10b in Weiterführungsleitungen 12a, 12b eingesetzte Rückschlagventile 11a, 11 b in eine einflutige Rückführleitung 13. Die Rückführleitung 13 leitet das zurückgeführte Abgas weiter über die zweite Stufe 14 des Abgasküh- lers zurück in die Ladeluftleitung 2. Die erste Stufe 10a, 10b des Abgaskühlers ist, ebenso wie die zweite Stufe 14, wassergekühlt, es kann aber auch vorgesehen sein, insbesondere die zweite Stufe mit Kühlluft zu kühlen. Die erste Stufe 10a, 10b kühlt das Abgas auf Temperaturen < als 180 0C und die zweite Stufe je nach der Temperatur des Kühlwassers des Niedertemperaturkreises auf eine Temperatur im Bereich von 70 0C oder geringer. Exhaust gas recirculation lines 8a, 8b branch off from the exhaust manifolds 7a, 7b and remove exhaust gas from the exhaust manifolds 7a, 7b and via exhaust recirculation valves 9a, 9b respectively connected to exhaust gas recirculation lines 9a, 9b of the first stage 10a, 10b of a two-stage exhaust gas cooler. From the respective first stage 10a, 10b of the exhaust gas cooler, the cooled exhaust gas passes via check valves 11a, 11b inserted into continuation lines 12a, 12b directly behind the first stage 10a, 10b into a single-flow return line 13. The return line 13 forwards the recirculated exhaust gas over the second stage 14 of the exhaust gas The first stage 10a, 10b of the exhaust gas cooler is, like the second stage 14, water-cooled, but it can also be provided, in particular to cool the second stage with cooling air. The first stage 10a, 10b cools the exhaust gas to temperatures <180 ° C. and the second stage cools to a temperature in the range of 70 ° C. or lower, depending on the temperature of the cooling water of the low-temperature circuit.
Bezugszeichenreference numeral
1 Brennkraftmaschine1 internal combustion engine
2 Ladeluftleitung2 charge air line
3 Ladeluftkühler3 intercooler
4 Verdichter4 compressors
5 Abgasturbolader5 exhaust gas turbocharger
6 Turbine6 turbine
7a, 7b Abgassammelleitung7a, 7b exhaust manifold
8a, 8b Abgasrückführleitung8a, 8b exhaust gas recirculation line
9a, 9b Abgasrückführventil9a, 9b exhaust gas recirculation valve
10a , 10b Stufe I10a, 10b level I
1 1 a , 11 b Rückschlagventil1 1 a, 11 b Check valve
12a , 12b Weiterführungsleitung12a, 12b continuation line
13 Rückführleitung13 return line
14 Stufe Il 14 level Il

Claims

A N S P R Ü C H E
1. Vorrichtung zur gekühlten Rückführung von Abgas einer mittels eines Abgasturboladers aufgeladenen Brennkraftmaschine, wobei die Brennkraftmaschine ein Frischgassystem und ein Abgassystem aufweist, die über eine Abgasrückführleitung mit zweistufigem Abgaskühler miteinander ver- bunden sind, dadurch gekennzeichnet, dass die Abgasrückführleitung (8a, 8b) mit einer Abgassammelleitung (7a, 7b) des Abgassystems in Strömungsrichtung vor der Turbine (6) des Abgasturboladers (5) verschaltet ist, dass in der Abgasrückführleitung (8a, 8b) vor der ersten Stufe (10a, 10b) des Abgasküh- lers ein Abgasrückführventil (9a, 9b) eingeschaltet ist und dass in einer Weiterführungsleitung (12a, 12b) zu der zweiten Stufe (14) des Abgaskühlers ein Rückschlagventil (11a, 11 b) eingesetzt ist.1. An apparatus for the cooled return of exhaust gas of an internal combustion engine charged by means of an exhaust gas turbocharger, wherein the internal combustion engine comprises a fresh gas system and an exhaust system, which are connected via an exhaust gas recirculation line with two-stage exhaust gas cooler, characterized in that the exhaust gas recirculation line (8a, 8b) an exhaust gas manifold (7a, 7b) of the exhaust system in the flow direction in front of the turbine (6) of the exhaust gas turbocharger (5) is connected, that in the exhaust gas recirculation line (8a, 8b) before the first stage (10a, 10b) of the exhaust gas cooler an exhaust gas recirculation valve ( 9a, 9b) is turned on and that in a continuation line (12a, 12b) to the second stage (14) of the exhaust gas cooler, a check valve (11a, 11 b) is inserted.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Abgasrückführleitung (8a, 8b) zu der ersten Stufe (10a, 10b) des Abgaskühlers zweiflutig mit zwei eingeschalteten Abgasrückführventilen (9a, 9b) ausgebildet ist.2. Apparatus according to claim 1, characterized in that the exhaust gas recirculation line (8a, 8b) to the first stage (10a, 10b) of the exhaust gas cooler is formed with two double-flow exhaust gas recirculation valves (9a, 9b).
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die erste Stufe (10a, 10b) des Abgaskühlers zweiflutig ausgestaltet ist.3. Apparatus according to claim 2, characterized in that the first stage (10a, 10b) of the exhaust gas cooler is configured in two columns.
4. Vorrichtung nach Anspruch 2 oder Anspruch 3, dadurch gekennzeichnet, dass die Weiterführungsleitung (12a, 12b) zwei- flutig mit jeweils einem zugeordneten Rückschlagventil (11a, 11 b) ausgestaltet ist. 4. Apparatus according to claim 2 or claim 3, characterized in that the continuation line (12a, 12b) is designed in two-flow, each with an associated non-return valve (11a, 11 b).
5. Vorrichtung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass die Weiterführungsleitung (12a, 12b) hinter den Rückschlagventilen (11 a, 1 1 b) zu einer einflutigen Rückführleitung (13) zusammengeführt ist.5. Device according to one of claims 2 to 4, characterized in that the continuation line (12a, 12b) behind the check valves (11 a, 1 1 b) is brought together to form a single-flow return line (13).
6. Vorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Abgassammelleitung (7a, 7b) zweiflutig ausgestaltet mit jeweils einer gleichen Anzahl nebeneinander liegender Zy- linder und voneinander getrennten Einlaufen in die Turbine (6) verschaltet ist.6. Device according to one of the preceding claims, characterized in that the exhaust manifold (7a, 7b) configured double-flow, each with an equal number of adjacent cylinders and separated from each other in the turbine (6) is connected.
7. Vorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Rückführleitung (13) in das Frischgas- system hinter einem den Verdichter (4) des Abgasturboladers (5) nachgeschalteten Ladeluftkühler (3) einmündet. 7. Device according to one of the preceding claims, characterized in that the return line (13) in the fresh gas system behind a compressor (4) of the exhaust gas turbocharger (5) downstream of the charge air cooler (3) opens.
EP09778787A 2008-10-02 2009-09-30 Two-stage cooled exhaust gas recirculation system Not-in-force EP2331803B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008050368A DE102008050368A1 (en) 2008-10-02 2008-10-02 Two-stage cooled exhaust gas recirculation system
PCT/EP2009/007033 WO2010037540A1 (en) 2008-10-02 2009-09-30 Two-stage cooled exhaust gas recirculation system

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EP2331803A1 true EP2331803A1 (en) 2011-06-15
EP2331803B1 EP2331803B1 (en) 2012-11-21

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US (1) US8991369B2 (en)
EP (1) EP2331803B1 (en)
DE (1) DE102008050368A1 (en)
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WO (1) WO2010037540A1 (en)

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US8991369B2 (en) 2015-03-31
US20110168142A1 (en) 2011-07-14
EP2331803B1 (en) 2012-11-21
DE102008050368A1 (en) 2010-04-08
WO2010037540A1 (en) 2010-04-08
ES2402136T3 (en) 2013-04-29

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