EP0355489B1 - Internal combustion engine multi branch exhaust pipe - Google Patents

Internal combustion engine multi branch exhaust pipe Download PDF

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Publication number
EP0355489B1
EP0355489B1 EP89114153A EP89114153A EP0355489B1 EP 0355489 B1 EP0355489 B1 EP 0355489B1 EP 89114153 A EP89114153 A EP 89114153A EP 89114153 A EP89114153 A EP 89114153A EP 0355489 B1 EP0355489 B1 EP 0355489B1
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EP
European Patent Office
Prior art keywords
guide element
exhaust pipe
exhaust gas
branch
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.)
Expired - Lifetime
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EP89114153A
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German (de)
French (fr)
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EP0355489A1 (en
Inventor
Reinhold Alt
Erhard Otto
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Priority claimed from DE8810816U external-priority patent/DE8810816U1/de
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0355489A1 publication Critical patent/EP0355489A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/02—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of high temperature, e.g. overheating of catalytic reactor

Definitions

  • the invention relates to a branched exhaust pipe of an internal combustion engine according to the preamble of claim 1.
  • Exhaust systems of motor vehicles provided with exhaust gas catalysts have become known, in which there is a relatively small-sized start catalytic converter connected to the exhaust line via a first branch, while a second branch leads directly to a continuous operation designed for a high mass throughput. Catalyst leads. Furthermore, a pivotable flap is arranged in the branching in the known prior art, which, depending on its position, directs the exhaust gas flow into the first or second branch of the exhaust pipe. This arrangement is provided in order to achieve a successful conversion of harmful exhaust gas components as soon as possible after starting the internal combustion engine.
  • branched exhaust pipes for example, known from DE-A-2420678 have proven themselves, but problems can arise in the technical design.
  • seizing of the flap in one of the two flap positions cannot be avoided despite the most complex storage and guidance due to the sometimes aggressive exhaust gas components.
  • the control mechanism for such a flap is extremely complex.
  • DE-OS 22 50 898 describes such a rotary flap, which not only opens automatically due to the higher flow pressure with a higher gas throughput, but also releases the second bypass line branch at a higher temperature under the influence of a bimetal spring.
  • the mechanical flap problems also occur here.
  • the object of the invention is therefore to demonstrate an exhaust pipe which is significantly reduced in terms of expenditure and of the type specified in the preamble of the first claim. This object is achieved by the characterizing features of the first claim, advantageous embodiments and further developments describe the subclaims.
  • the guide element is made of a material that deforms under the influence of temperature. By suitable shaping of the guide element it is thus possible to achieve the desired division or guidance in accordance with the shape dependent on the respective exhaust gas temperature.
  • expansion elements known per se can also be used.
  • the guide element can be designed as a bimetal element, which also has a different shape depending on the material temperature and thus also the temperature of the exhaust gas stream. In the sense of an advantageous combination of functions, both the determination of the exhaust gas temperature and the corresponding reaction, namely the desired division or guidance of the exhaust gas flow, always take place in the guide element itself. All this prevents, due to the directly acting adjusting forces triggered by the high temperature differences also seizing of the guide element.
  • FIG. 1 and 2 show preferred embodiments of the invention.
  • Fig. 3 shows the section A-A of Fig. 1st
  • the exhaust gas is discharged into the environment via an exhaust pipe designated in its entirety by 2 and via a continuous operation catalytic converter 3. Since the latter requires a certain minimum temperature for the successful conversion of harmful exhaust gas components, however, due to its large mass, this only takes a certain time after the start of the When the internal combustion engine is reached, a so-called start catalytic converter 4 with a smaller overall volume is additionally provided near the internal combustion engine. However, since the latter is not able to absorb the entire exhaust gas flow in the already heated state - this would destroy the starting catalytic converter due to high temperature peaks - this starting catalytic converter 4 is arranged in a second line branch 5 of the exhaust line 2, which is below Influence of a guide element 10 can be blocked. In these cases, the exhaust gas flows bypassing the start catalyst 4 via a first bypass line branch 6 directly to the continuous operation catalyst 3.
  • the guide element 10 which carries out the desired division or control of the exhaust gas flow, is generally made of a material deforming under the influence of temperature.
  • this guide element 10 is designed as a bimetal tongue.
  • this bimetallic tongue is connected with its end 11a to a web 12 of the exhaust pipe 2 expanded in the area of the starting catalytic converter.
  • this bimetal tongue is shown in two different positions. In the position shown with solid lines, the guide element 10 closes the bypass line branch 6 and guides the entire exhaust gas flow via the start catalytic converter 4. In the dash-dotted representation, however, the guide element blocks the second line branch 5, so that the entire exhaust gas flow is via the Bypass line branch 6 reaches catalytic converter 3 for continuous operation. In addition to these two extreme positions, the guide element 10 can of course also assume any intermediate position and, in particular, the exhaust gas flow, as desired divide with its free end 11b quantitatively between the two line branches 5, 6. Due to its bimetallic structure, the guide element 10 essentially assumes the desired position depending on the temperature of the exhaust gas flow.
  • the guide element 10 advantageously represents the wall separating the bypass line branch 6 from the second line branch 5 two extreme positions are provided. This measure considerably reduces the flow resistance within the exhaust pipe 2.
  • FIG. 2 Another exemplary embodiment is shown in FIG. 2.
  • the two line branches 5, 6 are implemented in separate pipelines.
  • two guide elements 10a, 10b are provided, which in turn are shown in the two possible extreme positions.
  • FIG. 3 shows a preferred measure for improved partitioning of the line branches 5 and 6 to be blocked off by the guide element 10.
  • the exhaust gas line has a cross-section widened within the adjustment range 13 of the guide element 10, which is hatched and shown in broken lines in FIG. 3 on.
  • the guide element 10 bears against the right step 14, as shown, analogous to a labyrinth of seals, there is an improved sealing of the line branch 6 then shut off.
  • This design also advantageously results in improved guidance of the guide element 10.

Description

Die Erfindung betrifft eine verzweigte Abgasleitung einer Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a branched exhaust pipe of an internal combustion engine according to the preamble of claim 1.

Es sind mit Abgas-Katalysatoren versehene Abgasanlagen von Kraftfahrzeugen bekannt geworden, bei welchen sich stromab der Verzweigung ein über einen ersten Zweig mit der Abgasleitung verbundener, relativ kleindimensionierter Start-Katalysator befindet, während ein zweiter Zweig direkt zu einem für einen hohen Massendurchsatz ausgelegten Dauerbetriebs-Katalysator führt. Ferner ist beim bekannten Stand der Technik im Bereich der Verzweigung eine schwenkbare Klappe angeordnet, welche in Abhängigkeit von ihrer Stellung den Abgasstrom in den ersten bzw. zweiten Zweig der Abgasleitung lenkt. Vorgesehen ist diese Anordnung, um nach einem Start der Brennkraftmaschine möglichst kurzfristig eine erfolgreiche Konvertierung schädlicher Abgasbestandteile zu erzielen. Da Katalysatoren zur Ausübung ihrer Funktion eine gewisse Minimaltemperatur aufweisen müssen, wird zunächst das gesamte Abgas über den Start-Katalysator geleitet, welcher sich aufgrund seines geringeren Bauvolumens deutlich schneller erwärmt als der wesentlich großvolumigere Dauerbetriebs-Katalysator. Um jedoch im Dauerbetrieb eine Überhitzung des Start-Katalysators zu vermeiden, wird durch Umlegen der Klappe der dann zumeist auch größere Abgasmassenstrom unter Umgehung des Start-Katalysators direkt dem stromab der Zusammenführung beider Leitungszweige angeordnetem Dauerbetriebs-Katalysator zugeführt.Exhaust systems of motor vehicles provided with exhaust gas catalysts have become known, in which there is a relatively small-sized start catalytic converter connected to the exhaust line via a first branch, while a second branch leads directly to a continuous operation designed for a high mass throughput. Catalyst leads. Furthermore, a pivotable flap is arranged in the branching in the known prior art, which, depending on its position, directs the exhaust gas flow into the first or second branch of the exhaust pipe. This arrangement is provided in order to achieve a successful conversion of harmful exhaust gas components as soon as possible after starting the internal combustion engine. Since catalytic converters must have a certain minimum temperature in order to perform their function, the entire exhaust gas is first passed through the start catalytic converter, which heats up significantly faster than the much larger-volume continuous catalytic converter due to its smaller construction volume. However, in order to avoid overheating of the start catalytic converter in continuous operation, the flap is turned over usually larger exhaust gas mass flow bypassing the start catalyst is fed directly to the continuous operation catalyst arranged downstream of the junction of the two line branches.

Funktional haben sich derartige verzweigte beispielsweise aus der DE-A-2420678 bekann Abgasleitungen zwar bewährt, in der technischen Ausführung können sich jedoch Probleme ergeben. So läßt sich oftmals ein Festfressen der Klappe in einer der beiden Klappenstellungen trotz aufwendigster Lagerung und Führung aufgrund der teilweise aggressiven Abgasbestandteile nicht vermeiden. Auch ist der Ansteuerungsmechanismus für eine derartige Klappe äußerst aufwendig.
So beschreibt beispielsweise die DE-OS 22 50 898 eine derartige Drehklappe, welche sich nicht nur durch den bei größerem Gasdurchsatz höheren Strömungsdruck selbsttätig öffnet, sondern darüber hinaus bei höherer Temperatur unter Einfluß einer Bimetallfeder den zweiten Bypass-Leitungszweig freigibt. Die mechanischen Klappen-Probleme treten jedoch auch hierbei auf.Functionally, such branched exhaust pipes, for example, known from DE-A-2420678 have proven themselves, but problems can arise in the technical design. Thus, seizing of the flap in one of the two flap positions cannot be avoided despite the most complex storage and guidance due to the sometimes aggressive exhaust gas components. The control mechanism for such a flap is extremely complex.
For example, DE-OS 22 50 898 describes such a rotary flap, which not only opens automatically due to the higher flow pressure with a higher gas throughput, but also releases the second bypass line branch at a higher temperature under the influence of a bimetal spring. However, the mechanical flap problems also occur here.

Aufgabe der Erfindung ist es daher, eine im Aufwand deutlich reduzierte Abgasleitung der im Oberbegriff des ersten Anspruchs angegebenen Art aufzuzeigen.
Diese Aufgabe wird durch die kennzeichnenden Merkmale des ersten Anspruchs gelöst, vorteilhafte Aus- und Weiterbildungen beschreiben die Unteransprüche.The object of the invention is therefore to demonstrate an exhaust pipe which is significantly reduced in terms of expenditure and of the type specified in the preamble of the first claim.
This object is achieved by the characterizing features of the first claim, advantageous embodiments and further developments describe the subclaims.

Erfindungsgemäß ist das Leitelement aus einem sich unter Temperatureinfluß verformenden Material gefertigt. Durch geeignete Formgebung des Leitelementes ist es somit möglich, die gewünschte Aufteilung bzw. Führung entsprechend der von der jeweiligen Abgastemperatur abhängigen Form zu erzielen. Neben der Verwendung von Memory-Legierungen können auch an sich bekannte Dehnstoff-Elemente zum Einsatz kommen. Gemäß Anspruch 2 kann darüber hinaus das Leitelement als Bimetall-Element ausgebildet sein, welches ebenfalls in Abhängigkeit von der Materialtemperatur und somit auch der Temperatur des Abgasstromes eine verschiedenartige Form aufweist. Im Sinne einer vorteilhaften Funktionsvereinigung erfolgt dabei sowohl die Ermittlung der Abgastemperatur als auch die entsprechende Reaktion, nämlich die gewünschte Aufteilung bzw. Führung des Abgasstromes, stets im Leitelement selbst. All dies verhindert aufgrund der stets direkt einwirkenden, durch die hohen Temperatur-unterschiede ausgelösten Verstellkräfte auch ein Festfressen des Leitelementes.According to the invention, the guide element is made of a material that deforms under the influence of temperature. By suitable shaping of the guide element it is thus possible to achieve the desired division or guidance in accordance with the shape dependent on the respective exhaust gas temperature. In addition to the use of memory alloys, expansion elements known per se can also be used. According to claim 2 can In addition, the guide element can be designed as a bimetal element, which also has a different shape depending on the material temperature and thus also the temperature of the exhaust gas stream. In the sense of an advantageous combination of functions, both the determination of the exhaust gas temperature and the corresponding reaction, namely the desired division or guidance of the exhaust gas flow, always take place in the guide element itself. All this prevents, due to the directly acting adjusting forces triggered by the high temperature differences also seizing of the guide element.

Eine besonders vorteilhafte, da konstruktiv einfache Ausbildung des Leitelementes beschreibt der dritte Anspruch, wobei insbesondere in Fällen, in denen der mit nur einem einzigen Bimetall-Leitelement realisierbare Verstellweg nicht ausreichend ist, gemäß Anspruch 4 auch mehrere solcher Leitelemente vorgesehen sein können. Die Merkmale des Anspruchs 5 schließlich bewirken eine verbesserte Abschottung des jeweils zu verschließenden Leitungszweiges, da in den jeweils verschließenden Positionen das Leitelement an den Stufen bzw. Absätzen, die sich aus der stufenförmigen Erweiterung der Querschnittsfläche ergeben, anliegt.A particularly advantageous, since structurally simple design of the guide element describes the third claim, and in particular in cases in which the adjustment path that can be realized with only a single bimetal guide element is not sufficient, several such guide elements can also be provided according to claim 4. Finally, the features of claim 5 bring about an improved partitioning of the line branch to be closed, since in the respectively closing positions the guide element bears against the steps or shoulders which result from the step-like expansion of the cross-sectional area.

Die Fig. 1 und 2 zeigen bevorzugte Ausführungsbeispiele der Erfindung. Fig. 3 zeigt den Schnitt A-A aus Fig. 1.1 and 2 show preferred embodiments of the invention. Fig. 3 shows the section A-A of Fig. 1st

Von einer Brennkraftmaschine 1 wird das Abgas über eine in ihrer Gesamtheit mit 2 bezeichnete Abgasleitung sowie über einen Dauerbetriebs-Katalysator 3 in die Umgebung abgeführt. Da letzterer für eine erfolgreiche Konvertierung schädlicher Abgasbestandteile eine gewisse Minimaltemperatur benötigt, diese jedoch aufgrund seiner großen Masse erst eine gewisse Zeit nach einem Start der Brennkraftmaschine erreicht, ist zusätzlich nahe der Brennkraftmaschine ein sog. Start-Katalysator 4 mit geringerem Bauvolumen vorgesehen. Da dieser jedoch nicht in der Lage ist, im bereits erwärmten Zustand den gesamten anfallenden Abgasstrom aufzunehmen - hierdurch würde der Start-Katalysator aufgrund hoher Temperaturspitzen zerstört werden -, ist dieser Start-Katalysator 4 in einem zweiten Leitungszweig 5 der Abgasleitung 2 angeordnet, welcher unter Einfluß eines Leitelementes 10 abgesperrt werden kann. In diesen Fällen strömt das Abgas unter Umgehung des Start-Katalysators 4 über einen ersten Bypass-Leitungszweig 6 direkt zum Dauerbetriebs-Katalysator 3.From an internal combustion engine 1, the exhaust gas is discharged into the environment via an exhaust pipe designated in its entirety by 2 and via a continuous operation catalytic converter 3. Since the latter requires a certain minimum temperature for the successful conversion of harmful exhaust gas components, however, due to its large mass, this only takes a certain time after the start of the When the internal combustion engine is reached, a so-called start catalytic converter 4 with a smaller overall volume is additionally provided near the internal combustion engine. However, since the latter is not able to absorb the entire exhaust gas flow in the already heated state - this would destroy the starting catalytic converter due to high temperature peaks - this starting catalytic converter 4 is arranged in a second line branch 5 of the exhaust line 2, which is below Influence of a guide element 10 can be blocked. In these cases, the exhaust gas flows bypassing the start catalyst 4 via a first bypass line branch 6 directly to the continuous operation catalyst 3.

Erfindungsgemäß ist das Leitelement 10, welches die gewünschte Aufteilung bzw. Lenkung des Abgasstromes vornimmt, allgemein aus einem sich unter Temperatureinfluß verformenden Material gefertigt. Insbesondere ist dieses Leitelement 10 als Bimetall-Zunge ausgebildet.According to the invention, the guide element 10, which carries out the desired division or control of the exhaust gas flow, is generally made of a material deforming under the influence of temperature. In particular, this guide element 10 is designed as a bimetal tongue.

Nach Fig. 1 ist diese Bimetall-Zunge mit ihrem Ende 11a an einem Steg 12 der im Bereich des Start-Katalysators erweiterten Abgasleitung 2 angebunden. Zum besseren Verständnis ist diese Bimetall-Zunge in zwei verschiedenen Positionen gezeigt. In der mit durchgezogenen Linien dargestellten Position verschließt das Leitelement 10 den Bypass-Leitungszweig 6 und führt den gesamten Abgasstrom über den Start-Katalysator 4. In der strich-punktierten Darstellung hingegen sperrt das Leitelement den zweiten Leitungszweig 5, so daß der gesamte Abgasstrom über den Bypass-Leitungszweig 6 zum Dauerbetriebs-Katalysator 3 gelangt. Neben diesen beiden Extremstellungen kann das Leitelement 10 selbstverständlich auch jegliche Zwischenstellung einnehmen und dabei den Abgasstrom - wie gewünscht - insbesondere mit ihrem freien Ende 11b quantitätsmäßig auf die beiden Leitungszweige 5, 6 aufteilen. Aufgrund seines Bimetall-Aufbaus nimmt dabei das Leitelement 10 im wesentlichen in Abhängigkeit von der Temperatur des Abgasstromes die jeweils gewünschte Position ein.According to FIG. 1, this bimetallic tongue is connected with its end 11a to a web 12 of the exhaust pipe 2 expanded in the area of the starting catalytic converter. For better understanding, this bimetal tongue is shown in two different positions. In the position shown with solid lines, the guide element 10 closes the bypass line branch 6 and guides the entire exhaust gas flow via the start catalytic converter 4. In the dash-dotted representation, however, the guide element blocks the second line branch 5, so that the entire exhaust gas flow is via the Bypass line branch 6 reaches catalytic converter 3 for continuous operation. In addition to these two extreme positions, the guide element 10 can of course also assume any intermediate position and, in particular, the exhaust gas flow, as desired divide with its free end 11b quantitatively between the two line branches 5, 6. Due to its bimetallic structure, the guide element 10 essentially assumes the desired position depending on the temperature of the exhaust gas flow.

Bei dieser Ausbildung stellt das Leitelement 10 im Sinne einer Funktionsvereinigung vorteilhafterweise zugleich die den Bypass-Leitungszweig 6 vom zweiten Leitungszweig 5 abtrennende Wand dar. Ferner ist die Abgasleitung mit zwei erweiterten Absätzen 8 versehen, welche zur Aufnahme des freien Endes 11b des Leitelementes 10 in seinen beiden Extrempositionen vorgesehen sind. Diese Maßnahme reduziert den Strömungswiderstand innerhalb der Abgasleitung 2 erheblich.In this embodiment, the guide element 10 advantageously represents the wall separating the bypass line branch 6 from the second line branch 5 two extreme positions are provided. This measure considerably reduces the flow resistance within the exhaust pipe 2.

Ein weiteres Ausführungsbeispiel zeigt Fig. 2. Hier sind die beiden Leitungszweige 5, 6 in getrennten Rohrleitungen ausgeführt. Im Bereich der Verzweigung 7 sind zwei Leitelemente 10a, 10b vorgesehen, welche wiederum in den beiden möglichen Extrempositionen dargestellt sind. Mit einer derartigen Anordnung lassen sich also auch größere Verstellwege mit Hilfe technisch einfach realisierbarer zungenförmiger Leitelemente realisieren.Another exemplary embodiment is shown in FIG. 2. Here, the two line branches 5, 6 are implemented in separate pipelines. In the area of the branch 7, two guide elements 10a, 10b are provided, which in turn are shown in the two possible extreme positions. With such an arrangement, even larger adjustment paths can be realized with the aid of tongue-shaped guide elements that are technically simple to implement.

Fig. 3 zeigt eine bevorzugte Maßnahme zur verbesserten Abschottung des jeweils durch das Leitelement 10 abzusperrenden Leitungszweiges 5 bzw. 6. Hierzu weist die Abgasleitung innerhalb des in Fig. 1 schraffiert und in Fig. 3 strichliert dargestellten Verstellbereiches 13 des Leitelementes 10 einen stufenförmig erweiterten Querschnitt auf. Liegt somit das Leitelement 10 - wie gezeigt - an der rechten Stufe 14 an, so ergibt sich analog einem Dichtungslabyrinth eine verbesserte Abdichtung des dann abgesperrten Leitungszweiges 6. Vorteilhafterweise ergibt sich mit dieser Gestaltung auch eine verbesserte Führung des Leitelementes 10.FIG. 3 shows a preferred measure for improved partitioning of the line branches 5 and 6 to be blocked off by the guide element 10. For this purpose, the exhaust gas line has a cross-section widened within the adjustment range 13 of the guide element 10, which is hatched and shown in broken lines in FIG. 3 on. Thus, if the guide element 10 bears against the right step 14, as shown, analogous to a labyrinth of seals, there is an improved sealing of the line branch 6 then shut off. This design also advantageously results in improved guidance of the guide element 10.

Claims (5)

1. A multi-branch exhaust pipe (2) of an internal combustion engine (1) having a guide element (10) for the temperature-dependent distribution of the exhaust gas flow to a pipe branch (5) having a catalyst (4) and to a by-pass pipe branch (6), characterised in that the guide element (10) is manufactured from a material which deforms under temperature influence and carries out the desired distribution of the exhaust gas current in dependence upon the form in each case.
2. A multi-branch exhaust pipe having a guide element (10) controlled by a bimetallic element according to Claim 1, characterised in that the guide element (10) is formed by the bimetallic element.
3. An exhaust pipe according to Claim 1 or 2, characterised in that the guide element, made in tongue form, is firmly attached at one end (11a) and guides and/or distributes the exhaust gas flow essentially with its free end (11b).
4. An exhaust pipe according to any one of the preceding Claims, characterised in that several guide elements (10a, 10b) are provided in the region of a pipe branching (7).
5. An exhaust pipe according to any one of the preceding Claims, characterised by a cross-sectional area widened in step form in the region of displacement of the guide element (10).
EP89114153A 1988-08-26 1989-08-01 Internal combustion engine multi branch exhaust pipe Expired - Lifetime EP0355489B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8810816U DE8810816U1 (en) 1988-08-26 1988-08-26
DE8810816U 1988-08-26
DE3832509 1988-09-24
DE3832509 1988-09-24

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EP0355489A1 EP0355489A1 (en) 1990-02-28
EP0355489B1 true EP0355489B1 (en) 1992-03-04

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DE1451881A1 (en) * 1963-09-07 1969-01-23 Daimler Benz Ag Device for the catalytic post-combustion of exhaust gases from an internal combustion engine, in particular in motor vehicles
US3963447A (en) * 1971-07-20 1976-06-15 Nissan Motor Co., Ltd. Catalytic reactor for exhaust gases
AT316934B (en) * 1972-02-10 1974-08-12 Johann Endholzer Device for guiding the exhaust gases from internal combustion engines
JPS5232006B2 (en) * 1972-05-09 1977-08-18
DE2420678A1 (en) * 1974-04-29 1975-11-06 Daimler Benz Ag Catalytic reactor system - for internal combustion engine with start-up and main reactors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10343468B4 (en) * 2003-09-19 2010-07-08 Audi Ag Exhaust gas cooler for an exhaust system of an internal combustion engine of a vehicle, in particular of a motor vehicle

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EP0355489A1 (en) 1990-02-28
DE58900911D1 (en) 1992-04-09

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