EP0104524B1 - Device for the recirculation of exhaust gas in an internal-combustion engine - Google Patents

Device for the recirculation of exhaust gas in an internal-combustion engine Download PDF

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Publication number
EP0104524B1
EP0104524B1 EP83108949A EP83108949A EP0104524B1 EP 0104524 B1 EP0104524 B1 EP 0104524B1 EP 83108949 A EP83108949 A EP 83108949A EP 83108949 A EP83108949 A EP 83108949A EP 0104524 B1 EP0104524 B1 EP 0104524B1
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EP
European Patent Office
Prior art keywords
exhaust gas
line
exhaust
combustion engine
recirculation
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.)
Expired
Application number
EP83108949A
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German (de)
French (fr)
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EP0104524A1 (en
Inventor
Wolfram Becker
Hermann Dr. Klein
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP0104524A1 publication Critical patent/EP0104524A1/en
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Publication of EP0104524B1 publication Critical patent/EP0104524B1/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
    • F02M26/42—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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the invention relates to a device according to the preamble of the main claim.
  • a bypass line leads from the exhaust side of the internal combustion engine to the intake side.
  • a valve is provided in the bypass line, which is controlled according to predetermined criteria for setting the return rate.
  • the exhaust gas recirculation line is usually quite short for structural reasons alone. In engines with a cross-flow cylinder head, however, this construction requires a relatively long line from the exhaust side to the intake side. If the recirculation rate is set relatively low, for example when driving at full load, the valve in the exhaust gas recirculation line is closed. Then the exhaust gas cools down in the return line and thus condensate is formed. If the recirculation rate is then increased again, the condensate accumulated in the recirculation line reaches the intake manifold of the engine and, together with the cooled exhaust gas fraction from the dead volume of the recirculation line, leads to an undefined transition behavior of the internal combustion engine.
  • the device according to the invention with the characterizing features of the main claim has the advantage that a formation of condensate is avoided, so that the corrosion in the exhaust gas recirculation line is reduced and that, finally, the transition behavior of the internal combustion engine when changing the recirculation rate and thus the exhaust gas quality is improved.
  • the underpressure required for purging the exhaust gas recirculation line is generated by the existing means in that the return line is guided to connect the front and rear silencers, a point which has a lower pressure than the exhaust gas side of the internal combustion engine.
  • the purging is further improved in that a venturi tube is arranged in the pipe section between the front and rear silencer.
  • the invention is illustrated in the drawing and is explained in more detail in the description below.
  • the single figure shows a basic illustration of an embodiment of a device according to the invention.
  • 10 denotes the cylinder head of an internal combustion engine, the intake side of which consists of an intake pipe 11 with a throttle valve 12 and an intake manifold 13. Accordingly, the exhaust side consists of an exhaust manifold 14, which leads to a front silencer 15, a pipe 16 and a rear silencer 17.
  • the exhaust side of the cylinder head 10 is connected to the intake side via an exhaust gas recirculation line. This initially consists of a first line 18 which is directly connected to the exhaust gas outlet of the cylinder head 10 and merges into a second line 19. The second line 19 leads to an exhaust gas recirculation valve 20, from which a third line 21 extends to the intake manifold 13.
  • the line routing shown is only meant by way of example and can also be designed differently in terms of construction, for example in that the exhaust gas recirculation valve 20 is arranged directly in the intake manifold 13.
  • a flushing line 22 leads from the connection point of the first line 18 and the second line 19 to the connecting pipe 16 between the front and rear silencers 15, 17.
  • the amount of exhaust gas brought up to the exhaust gas recirculation valve 20 is larger than that required for the actual recirculation by appropriate dimensioning of the lines 18, 19.
  • the excess part of the exhaust gas now flows back through the purge line 22 into the exhaust.
  • the purge line 22 always ensures an almost complete flow through the exhaust-side return line section.
  • the purge line 22 it would also be possible to lead the purge line 22 directly into the open, since the required pressure conditions would then also exist, but this would cause noise problems, since the exhaust gas flowing out of the purge line 22 would not be soundproofed.
  • the embodiment shown in the figure is particularly expedient, since the rear silencer 17 provides sufficient sound absorption. Since the purge line 22 also has a smaller cross section than the normal exhaust line, the damping effect of the rear silencer 17 is also sufficient.
  • the pipe 16 can be provided with a Venturi tube 23 in a further embodiment of the invention, so that the vacuum required for the purge in the pipe 16 is ensured.

Description

Die Erfindung geht aus von einer Einrichtung nach der Gattung des Hauptanspruches.The invention relates to a device according to the preamble of the main claim.

Es ist bekannt, Brennkraftmaschinen zur Verbesserung der Abgasqualität mit einer sogennanten Abgasrückführung zu versehen. Dabei führt eine Bypaß-Leitung von der Abgasseite der Brennkraftmaschine zur Ansaugseite. In der Bypaßleitung ist dabei ein Ventil vorgesehen, das nach vorgegebenen Kriterien zum Einstellen der Rückführrate angesteuert wird. Eine derartige Einrichtung ist beispeilsweise aus der DE-A-29 09 465 (= US-A-4 333 440) bekannt.It is known to provide internal combustion engines with so-called exhaust gas recirculation to improve the exhaust gas quality. A bypass line leads from the exhaust side of the internal combustion engine to the intake side. A valve is provided in the bypass line, which is controlled according to predetermined criteria for setting the return rate. Such a device is known for example from DE-A-29 09 465 (= US-A-4 333 440).

Bei Zylinderköpfen mit nebeneinanderliegenden Ventilen ist die Abgasrückführleitung schon aus baulichen Gründen in der Regel recht kurz. Bei Motoren mit Querstromzylinderkopf ist jedoch infolge dieser Bauart eine relativ lange Leitungsführung von der Abgasseite zur Ansaugseite erforderlich. Wird die Rüchführrate, beispielsweise bei Vollastfahren, relativ gering eingestellt, wird das Ventil in der Abgasrückführ- leitung geschlossen. Dann kommt es in der Rückführleitung zur Abkühlung des Abgases und damit zur Bildung von Kondensaten. Wird die Rückführrate nun wieder erhöht, gelangt das in der Rückführleitung angesammelte Kondensat in den Ansaugtrakt des Motors und führt zusammen mit dem abgekühlten Abgasanteil aus dem Totvolumen der Rückführleitung zu einem undefinierten Übergangsverhalten der Brennkraftmaschine. Da die Regelung der Brennkraftmaschine jedoch auf heisses Abgas abgestimmt ist, kommt es so zu Fehlsteuerungen der Brennkraftmaschine, durch die einmal das Fahrverhalten verschlechtert wird, zum anderen aber auch die durch die Abgasrückführung angestrebte Verbesserung der Abgasqualität zunichte gemacht werden kann.In the case of cylinder heads with valves lying side by side, the exhaust gas recirculation line is usually quite short for structural reasons alone. In engines with a cross-flow cylinder head, however, this construction requires a relatively long line from the exhaust side to the intake side. If the recirculation rate is set relatively low, for example when driving at full load, the valve in the exhaust gas recirculation line is closed. Then the exhaust gas cools down in the return line and thus condensate is formed. If the recirculation rate is then increased again, the condensate accumulated in the recirculation line reaches the intake manifold of the engine and, together with the cooled exhaust gas fraction from the dead volume of the recirculation line, leads to an undefined transition behavior of the internal combustion engine. However, since the regulation of the internal combustion engine is matched to hot exhaust gas, this leads to incorrect control of the internal combustion engine which, on the one hand, worsens driving behavior and, on the other hand, can also nullify the improvement in exhaust gas quality which is aimed for by exhaust gas recirculation.

Die erfindungsgemäße Einrichtung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß eine Kondensatbildung vermieden wird, daß damit die Korrosion in der Abgasrückführleitung verringert wird und daß schließlich das Übergangsverhalten der Brennkraftmaschine bei Veränderung der Rückführrate und damit die Abgasqualität verbessert wird.The device according to the invention with the characterizing features of the main claim has the advantage that a formation of condensate is avoided, so that the corrosion in the exhaust gas recirculation line is reduced and that, finally, the transition behavior of the internal combustion engine when changing the recirculation rate and thus the exhaust gas quality is improved.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen der im Hauptanspruch angegebenen Einrichtung möglich.Advantageous developments of the device specified in the main claim are possible through the measures listed in the subclaims.

So wird in bevorzugter Ausgestaltung der Erfindung der zum Spülen der Abgasrückführleitung erforderliche Unterdruck mit den vorhandenen Mitteln dadurch erzeugt, daß die Rückführleitung zur Verbindung von Vor- und Nachschalldämpfer geführt wird, einem Punkt, der gegenüber der Abgasseite der Brennkraftmaschine einen niedrigeren Druck aufweist. In weiterer Ausgestaltung der Erfindung wird die Spülung dadurch weiter verbessert, daß in dem genannten Rohrabschnitt zwischen Vor- und Nachschalldämpfer ein Venturirohr angeordnet wird.Thus, in a preferred embodiment of the invention, the underpressure required for purging the exhaust gas recirculation line is generated by the existing means in that the return line is guided to connect the front and rear silencers, a point which has a lower pressure than the exhaust gas side of the internal combustion engine. In a further embodiment of the invention, the purging is further improved in that a venturi tube is arranged in the pipe section between the front and rear silencer.

Weitere Vorteile ergeben sich aus der Beschreibung und der beigefügten Zeichnung.Further advantages result from the description and the attached drawing.

Die Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt eine Prinzipdarstellung einer Ausführungsform einer erfindungsgemäßen Einrichtung.The invention is illustrated in the drawing and is explained in more detail in the description below. The single figure shows a basic illustration of an embodiment of a device according to the invention.

In Figur 1 bezeichnet 10 den Zylinderkopf einer Brennkraftmaschine, dessen Ansaugseite aus einem Ansaugrohr 11 mit Drosselklappe 12 sowie einem Ansaugkrümmer 13 besteht. Entsprechend besteht die Abgasseite aus einem Auspuffkrümmer 14, der zu einem Vorschalldämpfer 15, einem Rohr 16 sowie einem Nachschalldämpfer 17 führt. Die Abgasseite des Zylinderkopfes 10 ist mit der Ansaugseite über eine Abgasrückführ- Leitung verbunden. Diese besteht zunächst aus einer ersten Leitung 18, die unmitellbar an den Abgasaustritt des Zylinderkopfes 10 angeschlossen ist und in eine zweite Leitung 19 übergeht. Die zweite Leitung 19 führt zu einem Abgas-Rückführventil 20, von dem sich eine dritte Leitung 21 zum Ansaugkrümmer 13 erstreckt. Es versteht sich, daß die dargestellte Leitungsführung nur beispielhaft gemeint ist und konstruktiv im Rahmen fachmännischen Handeins auch abweichend gestaltet werden kann, beispielsweise dadurch, daß das Abgas-Rückführventil 20 unmittelbar im Ansaugkrümmer 13 angeordnet ist. Vom Verbindungspunkt der ersten Leitung 18 und der zweiten Leitung 19 führt erfindungsgemäß eine Spülleitung 22 zu dem Verbindungsrohr 16 zwischen Vor- und Nachschalldämpfer 15, 17. Im Rohr 16 herrscht ein gegenüber dem Druck am Orte der Einmündung der ersten Leitung 18 in den Auspuffkrümmer 14 geringerer Druck. Die an das Abgas-Rückführventil 20 herangeführte Abgasmenge ist durch entsprechende Dimensionierung der Leitungen 18, 19 größer, als die zur eigentlichen Rückführung benötigte. Der überschüssige Teil des Abgases strömt nun über die Spülleitung 22 in den Auspuff zurück. Dies gilt insbesondere dann, wenn das Abgas-Rückführventil 20 geschlossen ist, so daß der gesamte Durchsatz der ersten Leitung 18 in die Spülleitung 22 strömt. Wird nun die zweite Leitung 19 konstruktiv besonders kurz ausgebildet, sorgt die Spülleitung 22 stets für eine nahezu vollständige Durchströmung des abgasseitigen Rückführleitungsabschnittes. Im Prinzip wäre es zwar auch möglich, die Spülleitung 22 unmittelbar ins Freie zu führen, da auch dann die erforderlichen Druckverhältnisse gegeben wären, dies würde jedoch Geräuschprobleme mit sich bringen, da das aus der Spülleitung 22 strömende Abgas nicht schallgedämpft wäre. Aus diesem Grunde ist die der Figur dargestellte Ausführungsform besonders zweckmäßig, da der Nachschalldämpfer 17 für eine genügende Schalldämpfung sorgt. Da die Spülleitung 22 gegenüber der normalen Abgasleitung auch einen geringeren Querschnitt hat, ist die Dämpfungswirkung des Nachschalldämpfers 17 auch ausreichend.In FIG. 1, 10 denotes the cylinder head of an internal combustion engine, the intake side of which consists of an intake pipe 11 with a throttle valve 12 and an intake manifold 13. Accordingly, the exhaust side consists of an exhaust manifold 14, which leads to a front silencer 15, a pipe 16 and a rear silencer 17. The exhaust side of the cylinder head 10 is connected to the intake side via an exhaust gas recirculation line. This initially consists of a first line 18 which is directly connected to the exhaust gas outlet of the cylinder head 10 and merges into a second line 19. The second line 19 leads to an exhaust gas recirculation valve 20, from which a third line 21 extends to the intake manifold 13. It goes without saying that the line routing shown is only meant by way of example and can also be designed differently in terms of construction, for example in that the exhaust gas recirculation valve 20 is arranged directly in the intake manifold 13. According to the invention, a flushing line 22 leads from the connection point of the first line 18 and the second line 19 to the connecting pipe 16 between the front and rear silencers 15, 17. In the pipe 16 there is less pressure than the pressure at the point where the first line 18 opens into the exhaust manifold 14 Print. The amount of exhaust gas brought up to the exhaust gas recirculation valve 20 is larger than that required for the actual recirculation by appropriate dimensioning of the lines 18, 19. The excess part of the exhaust gas now flows back through the purge line 22 into the exhaust. This applies in particular when the exhaust gas recirculation valve 20 is closed, so that the entire throughput of the first line 18 flows into the purge line 22. If the second line 19 is designed to be particularly short in terms of construction, the purge line 22 always ensures an almost complete flow through the exhaust-side return line section. In principle, it would also be possible to lead the purge line 22 directly into the open, since the required pressure conditions would then also exist, but this would cause noise problems, since the exhaust gas flowing out of the purge line 22 would not be soundproofed. For this reason, the embodiment shown in the figure is particularly expedient, since the rear silencer 17 provides sufficient sound absorption. Since the purge line 22 also has a smaller cross section than the normal exhaust line, the damping effect of the rear silencer 17 is also sufficient.

Sofern bei entsprechender Dimensionierung der Auspuffanlage die Druckdifferenz zwischen Auspuffkrümmer 14 und Rohr 16 zu gering ist, kann in weiterer Ausgestaltung der Erfindung das Rohr 16 mit einem Venturirohr 23 versehen sein, so daß der für die Spülung erforderliche Unterdruck im Rohr 16 gewährleistet ist.If with appropriate dimensioning the exhaust system the pressure difference between the exhaust manifold 14 and the pipe 16 is too small, the pipe 16 can be provided with a Venturi tube 23 in a further embodiment of the invention, so that the vacuum required for the purge in the pipe 16 is ensured.

Claims (3)

1. Device for the re-circulation of exhaust gas of an internal combustion engine with an exhaust gas re-circulation line (18, 19, 21) which leads from the exhaust side to the intake side of the internal combustion engine and in which a valve (20) for controlling the re-circulation rate is arranged, characterized in that a purge line (22) is connected on the line section (18, 19) of the exhaust gas re-circulation line leading from the exhaust side to the valve (20), which purge line has a smaller flow cross-section than the exhaust gas re-circulation line (18, 19, 21) leading from the exhaust side to the intake side and leads to a point (16, 23) of the exhaust side (14) which has a lower pressure than the point on the exhaust side (14) from which the exhaust gas re-circulation line (18) leads off.
2. Device according to Claim 1, characterized in that the purge line (22) leads to a connecting pipe (16) which is arranged between a front silencer (15) and a rear silencer (17) in continuance of the exhaust gas line.
3. Device according to Claim 2, characterized in that the connecting pipe (16) is designed as a Venturi tube (23) at the point of entry of the purge line (22).
EP83108949A 1982-09-24 1983-09-10 Device for the recirculation of exhaust gas in an internal-combustion engine Expired EP0104524B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823235397 DE3235397A1 (en) 1982-09-24 1982-09-24 DEVICE FOR RECYCLING EXHAUST GAS FROM AN INTERNAL COMBUSTION ENGINE
DE3235397 1982-09-24

Publications (2)

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EP0104524A1 EP0104524A1 (en) 1984-04-04
EP0104524B1 true EP0104524B1 (en) 1986-09-10

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EP83108949A Expired EP0104524B1 (en) 1982-09-24 1983-09-10 Device for the recirculation of exhaust gas in an internal-combustion engine

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US (1) US4467774A (en)
EP (1) EP0104524B1 (en)
JP (1) JPS5979061A (en)
AU (1) AU558920B2 (en)
DE (2) DE3235397A1 (en)

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Publication number Priority date Publication date Assignee Title
JP3025332B2 (en) * 1991-03-28 2000-03-27 マツダ株式会社 Engine exhaust gas recirculation system
US5241940A (en) * 1993-01-07 1993-09-07 Ford Motor Company Automotive EGR system
JP3852142B2 (en) * 1996-10-24 2006-11-29 いすゞ自動車株式会社 Exhaust gas recirculation device
US6659090B2 (en) * 2002-01-10 2003-12-09 Detroit Diesel Corporation System for purging exhaust gases from exhaust gas recirculation system
JP4526395B2 (en) * 2004-02-25 2010-08-18 臼井国際産業株式会社 Internal combustion engine supercharging system
FR2885178A1 (en) * 2005-04-27 2006-11-03 Renault Sas Power train for motor vehicle, has exhaust gas recirculation valves and back pressure valve circulating exhaust gas in cleaning circuit and evacuating gas in exhaust pipe, where circuit cleans section of exhaust gas recirculation circuit
US7886531B2 (en) * 2007-09-28 2011-02-15 Caterpillar Inc Exhaust system having outlet-located moisture entrainment device
US20110214648A1 (en) * 2011-03-03 2011-09-08 New Vision Fuel Technology, Inc. Passive re-induction apparatus, system, and method for recirculating exhaust gas in gasoline and diesel engines
US8490606B2 (en) * 2011-03-03 2013-07-23 New Vision Fuel Technology, Inc. Passive re-induction apparatus, system, and method for recirculating exhaust gas in gasoline and diesel engines
US8276571B2 (en) 2011-03-03 2012-10-02 New Vision Fuel Technology, Inc. Passive re-induction apparatus, system, and method for recirculating exhaust gas in gasoline and diesel engines
JP2015178777A (en) * 2014-03-18 2015-10-08 トヨタ自動車株式会社 internal combustion engine
EP3841289B1 (en) * 2018-08-23 2024-05-01 Volvo Truck Corporation A method for operating an internal combustion engine system

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Publication number Publication date
AU1939583A (en) 1984-03-29
EP0104524A1 (en) 1984-04-04
JPS5979061A (en) 1984-05-08
US4467774A (en) 1984-08-28
DE3366098D1 (en) 1986-10-16
AU558920B2 (en) 1987-02-12
DE3235397A1 (en) 1984-05-10

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