EP2287451B2 - Exhaust system and associated connection to an actuator - Google Patents

Exhaust system and associated connection to an actuator Download PDF

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Publication number
EP2287451B2
EP2287451B2 EP10162972.3A EP10162972A EP2287451B2 EP 2287451 B2 EP2287451 B2 EP 2287451B2 EP 10162972 A EP10162972 A EP 10162972A EP 2287451 B2 EP2287451 B2 EP 2287451B2
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EP
European Patent Office
Prior art keywords
connection
actuator
exhaust gas
section
exhaust system
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EP10162972.3A
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German (de)
French (fr)
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EP2287451A1 (en
EP2287451B1 (en
Inventor
Michael Pommerer
Jürgen KOBE
Manfred Nicolai
Michael Ihring
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Eberspaecher Exhaust Technology GmbH and Co KG
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Eberspaecher Exhaust Technology GmbH and Co KG
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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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • F01N1/065—Silencing apparatus characterised by method of silencing by using interference effect by using an active noise source, e.g. speakers

Definitions

  • the present invention relates to an exhaust system with a connection arrangement for acting as an active muffler actuator having the features of the preamble of claim 1.
  • a silencer is nowadays arranged in an exhaust system of the internal combustion engine.
  • This silencer can also be designed as an active silencer in the form of an actuator.
  • an active silencer is to make sure that the actuator is sufficiently thermally decoupled from the exhaust system.
  • an active silencer with an actuator is known, which is connected via a connection arrangement to a feeding pipe section of an exhaust system of an internal combustion engine, in particular of a motor vehicle.
  • the known connection arrangement is equipped with a connecting section arranged between the actuator and an exhaust-gas-side connection area for spacing the actuator relative to the exhaust system, wherein a change, namely an enlargement of a flow cross-section compared to at least the feeding pipe section, is formed in the connection system-side connection region.
  • a change namely an enlargement of a flow cross-section compared to at least the feeding pipe section
  • An exhaust system according to the preamble of claim 1 is known from EP 0 481 450 A1 known.
  • the present invention is concerned with the problem of providing an improved or at least another embodiment in an exhaust system with an actuator connected by such a connection arrangement designed as an active muffler, which is characterized in particular by an improved thermal decoupling of the actuator from the exhaust system.
  • the invention is based on the general idea of connecting an actuator acting as an active muffler to an exhaust system of an internal combustion engine, in particular of a motor vehicle, that at least one is connected in an exhaust-gas-side connection region to which the actuator is connected to a connection section for spacing with respect to the exhaust system Modification of a flow cross-section compared to at least one feeding pipe section is formed.
  • a better thermal decoupling of the actuator from the exhaust system can be achieved, which makes it possible to shorten the connection section.
  • the connecting portion By shortening the connecting portion, in turn, the acoustic efficiency of the actuator is improved.
  • the connection area on the exhaust system side is designed as a double pipe, in which a partition wall is arranged between two pipe halves.
  • At least one change in the flow cross-section in the connection area on the exhaust system side is produced by widening the connection area on the exhaust system side compared to at least the supply pipe section.
  • connection section is arranged at least partially parallel or at an acute angle to the connection area on the exhaust system side.
  • the formation of the exhaust system side connection region as a, in particular oval or round, double tube is preferred.
  • a connection arrangement 1 has a connection region 2 of an exhaust system 3, to which an actuator 4 acting as an active silencer is connected via a connection section 5.
  • the connecting portion 5 opens via a connection opening 6 in the exhaust system side connection area 2.
  • the connection area 2 opens with respect to an exhaust gas flow direction 7 arranged in front of the connection area 2 feeding tube section 8.
  • the connection region 2 is connected to a discharge pipe section 9, the is arranged in the exhaust gas flow direction 7 after the connection region 2.
  • connection region can be installed in an exhaust system 3 or the exhaust system side connection region 2 is formed as a part of the exhaust system 3 and the actuator 4 is fluidly connected to the connection region via its connection section 5 by means of the connection opening 6 2 connected or connectable.
  • the sound-damping effect of the actuator 4 with increasing distance from the connection region 2 and thus with increasing length of the connecting portion 5 is progressively worse.
  • the exhaust system 3 is flowed through by hot exhaust gases in accordance with the exhaust gas flow direction 7.
  • a vortex formation 10 can be set in the region of the connection opening 6, which causes an increased gas exchange between the connection section 5 and the connection region 2. Due to the vortex formation 10 increasingly hot exhaust gas of the exhaust system 3 enters the connecting section 5. This vortex formation 10 and the associated gas exchange, the thermal decoupling of the actuator 4 is deteriorated from the exhaust system 3. Also due to this, attention must be paid to a sufficient length of the connecting section 5.
  • the length of the connecting portion 5 can be shortened without deteriorating the thermal decoupling when the connecting portion 2 is provided with at least one change of a flow area of the exhaust gas compared to at least the feeding pipe portion 8.
  • Fig. 1 is such a change in the flow cross-section z. B. a widening 11 of the connection area 2 implemented.
  • a flow velocity of the exhaust gas in the connection region 2 decreases.
  • the vortex formation 10, in particular in the region of the connection opening 6, is reduced.
  • a reduction of flow noise and a reduction of a counterpressure caused by the actuator 4 acting as an active silencer are positively recorded.
  • the reduction of the vortex formation 10 reduces the gas exchange between the connection region 2 and the connection section 5, which results in improved thermal decoupling of the actuator 4 from the exhaust system 3.
  • connection assembly 1 Due to the improved thermal decoupling, it is now possible to make a shortening of the connecting portion 5. By this shortening of the connecting portion 5 but in turn the sound-absorbing effect of the actuator 4 is improved. Thus, by at least one change of the flow cross-section, such. As an expansion, in the connection area 2 implement several significant improvements of the connection assembly 1.
  • Fig. 2 can the in Fig. 1 shown embodiment by a arranged in the connection region Cover 12 can be improved. At least partially, the cover 12 conceals the connection opening 6 of the connection section 5 which opens into the connection region 2.
  • the cover 12 is formed as a pipe section 13.
  • This pipe section 13 may be integrally or integrally formed with at least the feeding pipe section of the exhaust system 3.
  • the vertebral formation 10 ' is reduced in the region of the connecting portion 5.
  • the pipe section 13 has a passage opening 14 at its end projecting into the connection region 2.
  • the plane spanned by the passage opening 14 can point in the direction of the connecting section 5, in the direction of the discharging pipe section 9 or on an area facing the connection opening 6.
  • further aerodynamic embodiments can be formed.
  • the upper section 15 of the pipe section 13 extends further into the connection region 2 than the lower section 16 of the pipe section 13.
  • the pipe section 13 projecting into the connection region 2 would be at least partially as a half pipe, for example formed, the upper portion 15 at least partially obscures the connection opening 6.
  • the pipe section 13 is formed continuously and integrally with the feeding pipe section 8 and the discharging pipe section 9 of the exhaust system 3.
  • the tube piece 13 arranged in the connection region 2 has at least one but preferably a plurality of through openings, which are also preferably arranged in a region of the tube piece 13 facing away from the connection opening 6. Even with such an embodiment, the thermal decoupling of the actuator 4 from the exhaust system 3 is further improved, without, however, impairing the acoustic connection of the actuator 4.
  • the cover 12 is at least partially spaced from the connection opening and / or that the cover 12 at least partially protrudes into the connection opening 6.
  • a constriction 17 of the flow cross-section compared to at least the feeding pipe section 8 is formed.
  • a kind of ramp 18 can be implemented, which can be positioned in the connection region in the exhaust gas flow direction 7 of the connection opening 6.
  • the connecting portion 5 is at least partially arranged in parallel or at an acute angle to the exhaust gas flow direction 7.
  • the at least partially parallel connection section 5 is at least partially separated by a separating plate 19 from a main flow path 20 of the exhaust gas.
  • connection region 2 in the manner of a, in particular oval or round, double tube 22, wherein the double tube 22 may be constructed of two D-shaped tube halves 23,24, between which a partition wall 19 may be arranged.
  • this partition wall 19 can have recesses 21, 21 ', so that the connecting section 5 of the actuator 4 connected to a first pipe half 23 is fluidically connected to the exhaust system 3 connected to a second pipe half 24.
  • connection arrangement 1 also has a cover 12 caused by the partition wall 19 of the connection opening 6. Furthermore, such an embodiment can be realized around a ramp 13 according to FIG Fig. 3 be extended. Somitsindje as needed, all design measures in any manner combined with each other without departing from the scope of the present invention.
  • connection arrangement 1 can be formed so that the trained as an active muffler actuator 4 at a reduced length of the connecting portion 5 has a very good thermal decoupling of the actuator 4 of the exhaust system 3, without the sound-absorbing effect of the actuator is impaired.
  • a reduction of the flow noise is made possible by at least some of the constructive measures described above. Also, by at least some of the design measures, a reduction of the caused by the active silencer actuator 4 caused flow resistance or back pressure can be achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Description

Die vorliegende Erfindung betrifft eine Abgasanlage mit einer Verbindungsanordnung für einen als aktiver Schalldämpfer wirkenden Aktuator mit den Merkmalen des Oberbegriffs des Anspruchs 1.The present invention relates to an exhaust system with a connection arrangement for acting as an active muffler actuator having the features of the preamble of claim 1.

Um die Geräuschbelastung von Brennkraftmaschinen zu reduzieren, ist heutzutage in einer Abgasanlage der Brennkraftmaschine ein Schalldämpfer angeordnet. Dieser Schalldämpfer kann auch als aktiver Schalldämpfer in Form eines Aktuators ausgebildet sein. Im Falle eines solchen aktiven Schalldämpfers ist darauf zu achten, dass der Aktuator von der Abgasanlage ausreichend thermisch entkoppelt ist.To reduce the noise level of internal combustion engines, a silencer is nowadays arranged in an exhaust system of the internal combustion engine. This silencer can also be designed as an active silencer in the form of an actuator. In the case of such an active silencer is to make sure that the actuator is sufficiently thermally decoupled from the exhaust system.

Aus der US 5, 693, 918 ist ein aktiver Schalldämpfer mit einem Aktuator bekannt, der über eine Verbindungsanordnung an einen zuführenden Rohrabschnitt einer Abgasanlage einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs, angeschlossen ist. Die bekannte Verbindungsanordnung ist mit einem zwischen dem Aktuator und einem abgasanlagenseitigen Anbindungsbereich angeordneten Verbindungsabschnitt zur Beabstandung des Aktuators gegenüber der Abgasanlage ausgestattet, wobei in dem abgasanlagenseitigen Anbindungsbereich eine Änderung, nämlich eine Erweiterung eines Strömungsquerschnittes im Vergleich zu zumindest dem zuführenden Rohrabschnitt ausgebildet ist. Bei der bekannten Verbindungsanordnung münden der Rohrabschnitt und der Anbindungsbereich nebeneinander in einen gemeinsamen Abschnitt der Abgasanlage.From the US Pat. No. 5,693,918 an active silencer with an actuator is known, which is connected via a connection arrangement to a feeding pipe section of an exhaust system of an internal combustion engine, in particular of a motor vehicle. The known connection arrangement is equipped with a connecting section arranged between the actuator and an exhaust-gas-side connection area for spacing the actuator relative to the exhaust system, wherein a change, namely an enlargement of a flow cross-section compared to at least the feeding pipe section, is formed in the connection system-side connection region. In the known connection arrangement of the pipe section and the connection area open side by side in a common portion of the exhaust system.

Bei einer aus der US 5, 336, 856 bekannten Verbindungsanordnung sind der abgasanlagenseitige Anbindungsbereich und der zuführende Rohrabschnitt als zueinander koaxiale Rohre angeordnet.At one of the US 5,336,856 Known connection arrangement of the exhaust system side connection area and the feeding pipe section are arranged as mutually coaxial pipes.

Eine Abgasanlage gemäß dem Oberbegriff des Anspruchs 1 ist aus der EP 0 481 450 A1 bekannt.An exhaust system according to the preamble of claim 1 is known from EP 0 481 450 A1 known.

Die vorliegende Erfindung beschäftigt sich mit dem Problem, bei einer Abgasanlage mit einem durch eine solche Verbindungsanordnung angebundenen als aktiver Schalldämpfer ausgebildeten Aktuator eine verbesserte oder zumindest eine andere Ausführungsform anzugeben, die sich insbesondere durch eine verbesserte thermische Entkopplung des Aktuators von der Abgasanlage auszeichnet.The present invention is concerned with the problem of providing an improved or at least another embodiment in an exhaust system with an actuator connected by such a connection arrangement designed as an active muffler, which is characterized in particular by an improved thermal decoupling of the actuator from the exhaust system.

Erfindungsgemäß wird dieses Problem durch den Gegenstand des Anspruchs 1 gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.According to the invention, this problem is solved by the subject matter of claim 1. Advantageous embodiments are the subject of the dependent claims.

Die Erfindung beruht auf dem allgemeinen Gedanken, einen als aktiver Schalldämpfer wirkenden Aktuator so an eine Abgasanlage einer Brennkraftmaschine, insbesondere eines Kraftfahrzeugs, anzubinden, dass in einem abgasanlagenseitigen Anbindungsbereich, an den der Aktuator mit einem Verbindungsabschnitt zur Beabstandung gegenüber der Abgasanlage verbunden ist, zumindest eine Änderung eines Strömungsquerschnittes im Vergleich zu zumindest einem zuführenden Rohrabschnitt ausgebildet ist. Durch eine solche Änderung des Strömungsquerschnittes in dem abgasanlagenseitigen Anbindungsbereich kann eine bessere thermische Entkopplung des Aktuators zur Abgasanlage erreicht werden, wodurch es möglich wird, den Anbindungsabschnitt zu verkürzen. Durch die Verkürzung des Verbindungsabschnittes ist wiederum die akustische Wirksamkeit des Aktuators verbessert. Bei der erfindungsgemäßen Verbindungsanordnung ist der abgasanlagenseitige Anbindungsbereich als ein Doppelrohr ausgebildet, bei dem zwischen zwei Rohrhälften eine Trennwand angeordnet ist. Durch diese Bauform kann der Wärmeeintrag vom Abgas führenden Rohrabschnitt in den Verbindungsabschnitt reduziert werden.The invention is based on the general idea of connecting an actuator acting as an active muffler to an exhaust system of an internal combustion engine, in particular of a motor vehicle, that at least one is connected in an exhaust-gas-side connection region to which the actuator is connected to a connection section for spacing with respect to the exhaust system Modification of a flow cross-section compared to at least one feeding pipe section is formed. By such a change of the flow cross-section in the exhaust-gas-side connection region, a better thermal decoupling of the actuator from the exhaust system can be achieved, which makes it possible to shorten the connection section. By shortening the connecting portion, in turn, the acoustic efficiency of the actuator is improved. In the connection arrangement according to the invention, the connection area on the exhaust system side is designed as a double pipe, in which a partition wall is arranged between two pipe halves. By this design, the heat input from the exhaust gas pipe section can be reduced in the connecting portion.

In einer bevorzugten Ausführungsform ist zumindest eine Änderung des Strömungsquerschnittes in dem abgasanlagenseitigen Anbindungsbereich durch eine Aufweitung des abgasanlagenseitigen Anbindungsbereiches im Vergleich zu zumindest dem zuführenden Rohrabschnitt hergestellt. Durch eine solche Aufweitung des Strömungsquerschnittes wird zum einen die Strömungsgeschwindigkeit im Bereich des Verbindungsabschnittes verringert, wodurch die Ablösung von Wirbeln reduziert wird und zum anderen ist durch die Aufweitung des Strömungsquerschnittes ein durch den als aktiver Schalldämpfer ausgebildeten Aktuatorverursachter Strömungswiderstand des Abgases verringert. Des Weiteren wird durch die Aufweitung des Strömungsquerschnittes der Gasaustausch zwischen dem Verbindungsabschnitt und dem abgasanlagenseitigen Anbindungsbereich verringert, so dass aufgrund der verbesserten thermischen Entkopplung des Aktuators von der Abgasanlage der Verbindungsabschnitt verkürzt werden kann.In a preferred embodiment, at least one change in the flow cross-section in the connection area on the exhaust system side is produced by widening the connection area on the exhaust system side compared to at least the supply pipe section. By such a widening of the flow cross-section, the flow velocity in the region of the connecting section is reduced on the one hand, whereby the detachment of vortices is reduced and, on the other hand, the expansion of the flow cross-section reduces a flow resistance of the exhaust gas caused by the actuator designed as an active muffler. Furthermore, as a result of the widening of the flow cross-section, the gas exchange between the connection section and the connection system-side connection region is reduced, so that the connection section can be shortened due to the improved thermal decoupling of the actuator from the exhaust system.

In einer weiteren bevorzugten Ausführungsform ist der Verbindungsabschnitt zumindest teilweise parallel oder unter einem spitzen Winkel zu dem abgasanlagenseitigen Anbindungsbereich angeordnet. Dabei ist die Ausbildung des abgasanlagenseitigen Anbindungsbereiches als ein, insbesondere ovales oder rundes, Doppelrohr bevorzugt. Durch eine solche parallele Anbindung des Verbindungsabschnittes an den abgasanlagenseitigen Anbindungsbereich ist zum einen eine Aufweitung des Strömungsquerschnittes des Anbindungsbereiches verwirklicht und zum anderen der Gasaustausch zwischen dem abgasanlagenseitigen Anbindungsbereich und dem Verbindungsabschnitt deutlich verringert. Dies führt wie auch oben schon ausgeführt zu einer verbesserten thermischen Entkopplung des Aktuators von der Abgasanlage mit den bekannten Vorteilen.In a further preferred embodiment, the connection section is arranged at least partially parallel or at an acute angle to the connection area on the exhaust system side. Here, the formation of the exhaust system side connection region as a, in particular oval or round, double tube is preferred. Such a parallel connection of the connecting section to the exhaust-gas-side connecting region realizes, on the one hand, a widening of the flow cross-section of the connecting region and, on the other hand, significantly reduces the gas exchange between the connecting-gas-side connecting region and the connecting section. As stated above, this leads to improved thermal decoupling of the actuator from the exhaust system with the known advantages.

Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen, wobei die in den Fig.1 bis 3 gezeigten Ausführungsformen nicht unter den Schutzbereich der Ansprüche fallen.Other important features and advantages of the invention will become apparent from the subclaims, from the drawings and from the associated description of the figures with reference to the drawings, wherein in the Fig.1 to 3 embodiments not shown in the Scope of the claims fall.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen.Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Es zeigen, jeweils schematisch

Fig. 1
einen an eine Abgasanlage angebundenen Aktuator mit einer Aufweitung eines Strömungsquerschnittes in einem abgasanlagenseitigen Anbindungsbereich,
Fig. 2
den abgasanlagenseitigen Anbindungsbereich gemäß Fig. 2 mit einer zumindest teilweisen Abdeckung einer in den abgasanlagenseitigen Anbindungsbereich einmündenden Anbindungsöfifnung ei- nes Verbindungsabschnittes,
Fig. 3
einen abgasanlagenseitigen Anbindungsbereich mit einer in einer Abgasströmungsrichtung von der Anbindungsöfifnung angeordneten Verengung des Strömungsquerschnittes,
Fig. 4
einen abgasanlagenseitigen Anbindungsbereich mit einem zumin- dest teilweise parallel zu der Abgasströmungsrichtung angeordneten Verbindungsabschnitt,
Fig. 5
einen Querschnitt durch einen als Doppelrohr ausgebildeter abgas- anlagenseitigen Anbindungsbereich.
It show, each schematically
Fig. 1
a connected to an exhaust system actuator with a widening of a flow cross-section in a connection system side,
Fig. 2
the exhaust gas side connection area according to Fig. 2 with an at least partial covering of an attachment opening of a connection section which opens into the connection system area in the exhaust-gas-side connection area,
Fig. 3
an exhaust gas-side connection region with a constriction of the flow cross-section arranged in an exhaust gas flow direction of the Anbindungsöfifnung,
Fig. 4
an attachment system-side attachment region with a connection section arranged at least partially parallel to the exhaust-gas flow direction,
Fig. 5
a cross section through a trained as a double tube exhaust system side connection area.

Wie in Fig. 1 dargestellt, weist eine Verbindungsanordnung 1 einen Anbindungsbereich 2 einer Abgasanlage 3 auf, an den ein als aktiver Schalldämpfer wirkender Aktuator 4 über einen Verbindungsabschnitt 5 angebunden ist. Dabei mündet der Verbindungsabschnitt 5 über eine Anbindungsöffnung 6 in den abgasanlagenseitigen Anbindungsbereich 2. Ebenfalls in den Anbindungsbereich 2 mündet ein bzgl. einer Abgasströmungsrichtung 7 vor dem Anbindungsbereich 2 angeordneter zuführender Rohrabschnitt 8. Des Weiteren ist der Anbindungsbereich 2 mit einem abführenden Rohrabschnitt 9 verbunden, das in der Abgasströmungsrichtung 7 nach dem Anbindungsbereich 2 angeordnet ist. Über den zuführenden Rohrabschnitt 8 und den abführenden Rohrabschnitt 9 lässt sich entweder der Anbindungsbereich in eine Abgasanlage 3 einbauen oder der abgasanlagenseitige Anbindungsbereich 2 ist als ein Teil der Abgasanlage 3 ausgebildet und der Aktuator 4 ist über seinen Verbindungsabschnitt 5 mittels der Anbindungsöffnung 6 fluidisch mit dem Anbindungsbereich 2 verbunden bzw. verbindbar. Dabei dient der Verbindungsabschnitt 5 der Beabstandung des Aktuators 4 gegenüber der Abgasanlage 3. Diese Beabstandung ist notwendig um eine notwendige thermische Entkopplung des Aktuators 4 von den heißen Abgasen der Abgasanlage 3 sicherzustellen. Allerdings wird die schalldämpfende Wirkung des Aktuators 4 mit wachsendem Abstand von dem Anbindungsbereich 2 und somit mit anwachsender Länge des Verbindungsabschnittes 5 zunehmend schlechter. Im Betrieb wird die Abgasanlage 3 von heißen Abgasen gemäß der Abgasströmungsrichtung 7 durchströmt. Dabei kann sich im Bereich der Anbindungsöffnung 6 eine Wirbelausbildung 10 einstellen, die einen vermehrten Gasaustausch zwischen dem Verbindungsabschnitt 5 und dem Anbindungsbereich 2 verursacht. Durch die Wirbelausbildung 10 gelangt vermehrt heißes Abgas der Abgasanlage 3 in den Verbindungsabschnitt 5. Durch diese Wirbelausbildung 10 und den damit einhergehenden Gasaustausch ist die thermische Entkopplung des Aktuators 4 von der Abgasanlage 3 verschlechtert. Auch aufgrund dessen ist auf eine ausreichende Länge des Verbindungsabschnittes 5 zu achten.As in Fig. 1 1, a connection arrangement 1 has a connection region 2 of an exhaust system 3, to which an actuator 4 acting as an active silencer is connected via a connection section 5. In this case, the connecting portion 5 opens via a connection opening 6 in the exhaust system side connection area 2. Also in the connection area 2 opens with respect to an exhaust gas flow direction 7 arranged in front of the connection area 2 feeding tube section 8. Furthermore, the connection region 2 is connected to a discharge pipe section 9, the is arranged in the exhaust gas flow direction 7 after the connection region 2. Via the feeding pipe section 8 and the discharging pipe section 9, either the connection region can be installed in an exhaust system 3 or the exhaust system side connection region 2 is formed as a part of the exhaust system 3 and the actuator 4 is fluidly connected to the connection region via its connection section 5 by means of the connection opening 6 2 connected or connectable. Here, the connecting portion 5 of the spacing of the actuator 4 relative to the exhaust system 3. This spacing is necessary to ensure a necessary thermal decoupling of the actuator 4 of the hot exhaust gases of the exhaust system 3. However, the sound-damping effect of the actuator 4 with increasing distance from the connection region 2 and thus with increasing length of the connecting portion 5 is progressively worse. In operation, the exhaust system 3 is flowed through by hot exhaust gases in accordance with the exhaust gas flow direction 7. In this case, a vortex formation 10 can be set in the region of the connection opening 6, which causes an increased gas exchange between the connection section 5 and the connection region 2. Due to the vortex formation 10 increasingly hot exhaust gas of the exhaust system 3 enters the connecting section 5. This vortex formation 10 and the associated gas exchange, the thermal decoupling of the actuator 4 is deteriorated from the exhaust system 3. Also due to this, attention must be paid to a sufficient length of the connecting section 5.

Die Länge des Verbindungsabschnittes 5 lässt sich jedoch ohne Verschlechterung der thermischen Entkopplung verkürzen, wenn der Anbindungsbereich 2 mit zumindest einer Änderung eines Strömungsquerschnittes des Abgases im Vergleich zu zumindest dem zuführenden Rohrabschnitt 8 ausgestattet wird.However, the length of the connecting portion 5 can be shortened without deteriorating the thermal decoupling when the connecting portion 2 is provided with at least one change of a flow area of the exhaust gas compared to at least the feeding pipe portion 8.

In einem Ausführungsbeispiel gemäß der Fig. 1 ist eine solche Änderung des Strömungsquerschnittes durch z. B. eine Aufweitung 11 des Anbindungsbereichs 2 umgesetzt. Durch diese Aufweitung 11 des abgasanlagenseitigen Anbindungsbereichs 2 sinkt eine Strömungsgeschwindigkeit des Abgases im Anbindungsbereich 2. Unter anderem dadurch wird die Wirbelausbildung 10, insbesondere im Bereich der Anbindungsöffnung 6, reduziert. Des Weiteren ist positiv eine Reduktion von Strömungsgeräuschen und eine Verringerung eines durch den als aktiven Schalldämpfer wirkenden Aktuator 4 verursachten Gegendrucks zu verzeichnen. Auch wird durch die Reduktion der Wirbelausbildung 10 der Gasaustausch zwischen dem Anbindungsbereich 2 und dem Verbindungsabschnitt 5 verringert, was eine verbesserte thermische Entkopplung des Aktuators 4 von der Abgasanlage 3 zur Folge hat. Aufgrund der verbesserten thermischen Entkopplung ist es nunmehr möglich, eine Verkürzung des Verbindungsabschnittes 5 vorzunehmen. Durch diese Verkürzung des Verbindungsabschnittes 5 ist aber wiederum die schalldämpfende Wirkung des Aktuators 4 verbessert. So lässt sich durch zumindest eine Änderung des Strömungsquerschnittes, wie z. B. eine Aufweitung, im Anbindungsbereich 2 mehrere signifikante Verbesserungen der Verbindungsanordnung 1 umsetzen.In an embodiment according to the Fig. 1 is such a change in the flow cross-section z. B. a widening 11 of the connection area 2 implemented. As a result of this widening 11 of the connection system 2 on the exhaust gas side, a flow velocity of the exhaust gas in the connection region 2 decreases. Among other things, the vortex formation 10, in particular in the region of the connection opening 6, is reduced. Furthermore, a reduction of flow noise and a reduction of a counterpressure caused by the actuator 4 acting as an active silencer are positively recorded. Also, the reduction of the vortex formation 10 reduces the gas exchange between the connection region 2 and the connection section 5, which results in improved thermal decoupling of the actuator 4 from the exhaust system 3. Due to the improved thermal decoupling, it is now possible to make a shortening of the connecting portion 5. By this shortening of the connecting portion 5 but in turn the sound-absorbing effect of the actuator 4 is improved. Thus, by at least one change of the flow cross-section, such. As an expansion, in the connection area 2 implement several significant improvements of the connection assembly 1.

Gemäß Fig. 2 kann die in Fig. 1 gezeigte Ausführungsform durch eine in dem Anbindungsbereich angeordnete Abdeckung 12 verbessert werden. Dabei verdeckt zumindest teilweise die Abdeckung 12 die in den Anbindungsbereich 2 einmündende Anbindungsöffnung 6 des Anbindungsabschnittes 5.According to Fig. 2 can the in Fig. 1 shown embodiment by a arranged in the connection region Cover 12 can be improved. At least partially, the cover 12 conceals the connection opening 6 of the connection section 5 which opens into the connection region 2.

In einer bevorzugten Ausführungsform ist dabei die Abdeckung 12 als Rohrstück 13 ausgebildet. Dieses Rohrstück 13 kann integral bzw. einstückig mit zumindest dem zuführenden Rohrabschnitt der Abgasanlage 3 ausgebildet sein. Durch ein solches Rohrstück 13 ist die Wirbelausbildung 10' im Bereich des Verbindungsabschnittes 5 reduziert. Dadurch ist die thermische Entkopplung des Aktuators 4 von der Abgasanlage 3 weiter verbessert. Das Rohrstück 13 weist an seinem in den Anbindungsbereich 2 hineinragenden Ende eine Durchgangsöffnung 14 auf. Die von der Durchgangsöffnung 14 aufgespannte Ebene kann in Richtung des Verbindungsabschnittes 5, in Richtung des abführenden Rohrabschnittes 9 oder auf einen der Anbindungsöffnung 6 gegenüberliegenden Bereich zeigen. Dadurch lassen sich weitere strömungsgünstige Ausführungsformen ausbilden. So ist es zum Beispiel denkbar, dass derobere Abschnitt 15 des Rohrstückes 13 sich weiter in den Anbindungsbereich 2 hineinerstreckt, als der untere Abschnitt 16 des Rohrstückes 13. In dieser Ausführungsform wäre der in den Anbindungsbereich 2 hineinragende Rohrstück 13 zum Beispiel wenigstens teilweise als längshalbiertes Halbrohr ausgebildet, dessen oberer Abschnitt 15 zumindest teilweise die Anbindungsöffnung 6 verdeckt.In a preferred embodiment, the cover 12 is formed as a pipe section 13. This pipe section 13 may be integrally or integrally formed with at least the feeding pipe section of the exhaust system 3. By such a piece of pipe 13, the vertebral formation 10 'is reduced in the region of the connecting portion 5. As a result, the thermal decoupling of the actuator 4 is further improved by the exhaust system 3. The pipe section 13 has a passage opening 14 at its end projecting into the connection region 2. The plane spanned by the passage opening 14 can point in the direction of the connecting section 5, in the direction of the discharging pipe section 9 or on an area facing the connection opening 6. As a result, further aerodynamic embodiments can be formed. For example, it is conceivable that the upper section 15 of the pipe section 13 extends further into the connection region 2 than the lower section 16 of the pipe section 13. In this embodiment, the pipe section 13 projecting into the connection region 2 would be at least partially as a half pipe, for example formed, the upper portion 15 at least partially obscures the connection opening 6.

In einer weiteren Ausführungsform ist das Rohrstück 13 durchgehend und integral bzw. einstückig mit dem zuführenden Rohrabschnitt 8 und dem abführenden Rohrabschnitt 9 der Abgasanlage 3 ausgebildet. In diesem Fall ist es besonders vorteilhaft, wenn das in dem Anbindungsbereich 2 angeordnete Rohrstück 13 zumindest eine bevorzugt allerdings mehrere Durchgangsöffnungen aufweist, die zudem bevorzugt in einem von derAnbindungsöffnung 6 abgewandten Bereich des Rohrstückes 13 angeordnet sind. Auch durch eine solche Ausführungsform istdie thermische Entkopplung desAktuators 4 von der Abgasanlage 3 weiterhin verbessert, ohne jedoch die akustische Anbindung des Aktuators 4 zu beeinträchtigen.In a further embodiment, the pipe section 13 is formed continuously and integrally with the feeding pipe section 8 and the discharging pipe section 9 of the exhaust system 3. In this case, it is particularly advantageous if the tube piece 13 arranged in the connection region 2 has at least one but preferably a plurality of through openings, which are also preferably arranged in a region of the tube piece 13 facing away from the connection opening 6. Even with such an embodiment, the thermal decoupling of the actuator 4 from the exhaust system 3 is further improved, without, however, impairing the acoustic connection of the actuator 4.

Des Weiteren ist es in einer anderen Ausführungsformen denkbar, die Abdeckung 12 unabhängig von dem zuführenden Rohrabschnitt 8 und/oder dem abführenden Rohrabschnitt 9 innerhalb des Anbindungsbereiches 2 auszubilden.Furthermore, it is conceivable in another embodiment to form the cover 12 independently of the feeding pipe section 8 and / or the discharging pipe section 9 within the connection region 2.

Bei allen Ausführungsformen mit einer Abdeckung 12 soll es möglich sein, dass die Abdeckung 12 zumindest teilweise von der Anbindungsöffnung beabstandet ist und/oder dass die Abdeckung 12 zumindest teilweise in die Anbindungsöffnung 6 hineinragt.In all embodiments with a cover 12, it should be possible that the cover 12 is at least partially spaced from the connection opening and / or that the cover 12 at least partially protrudes into the connection opening 6.

IneinerweiterenAusführungsform,gemäßFig. 3, ist der Abgasströmungsrichtung 7 folgend vor der Anbindungsöffnung 6 in dem Anbindungsbereich 2 eine Verengung 17 des Strömungsquerschnitt im Vergleich zu zumindest dem zuführenden Rohrabschnitt 8 ausgebildet. Dies kann zum Beispiel durch, wie in Fig. 3 dargestellt, eine Art Rampe 18 umgesetzt werden, die im Anbindungsbereich in der Abgasströmungsrichtung 7 von der Anbindungsöffnung 6 positioniert werden kann. Des Weiteren ist es ebenso möglich, die Rampe in Umfangsrichtung durchgehend auszugestalten, so dass eine Art Düse ausgebildet wird. Auch durch eine solche konstruktive Maßnahme ist eine Wirbelausbildung 10, 10' am bzw. im Verbindungsabschnitt 5 reduziert. Dabei kann der Winkel unter dem die Rampe 18 zu der Abgasströmungsrichtung 7 steht hinsichtlich der Wirbelausbildung 10 im Bereich des Verbindungsabschnittes 5 optimiert werden.IneinerweiterenAusführungsform, according Fig. 3 , the exhaust gas flow direction 7 following the connection opening 6 in the connection region 2, a constriction 17 of the flow cross-section compared to at least the feeding pipe section 8 is formed. This can be done, for example, as in Fig. 3 represented, a kind of ramp 18 can be implemented, which can be positioned in the connection region in the exhaust gas flow direction 7 of the connection opening 6. Furthermore, it is also possible to design the ramp continuously in the circumferential direction, so that a type of nozzle is formed. Even by such a constructional measure, a vertebral formation 10, 10 'is reduced on or in the connecting section 5. In this case, the angle at which the ramp 18 to the exhaust gas flow direction 7 with respect to the vortex formation 10 in the region of the connecting portion 5 can be optimized.

In einer weiteren bevorzugten Ausführungsform, wie in Fig. 4 dargestellt, ist der Verbindungsabschnitt 5 zumindest teilweise parallel oder unter einem spitzen Winkel zu der Abgasströmungsrichtung 7 angeordnet. Hier ist es denkbar, dass im Anbindungsbereich 2 der zumindest teilweise parallele Verbindungsabschnitt 5 durch ein Trennblech 19 von einem Hauptströmungspfad 20 des Abgases zumindest teilweise getrennt wird. Um den Verbindungsabschnitt 5 fluidisch mit dem Anbindungsbereich 2 zu verbinden, ist es vorteilhaft, das Trennblech 19 ggf. mit zumindest einer Aussparung 21, 21' auszustatten.In a further preferred embodiment, as in Fig. 4 1, the connecting portion 5 is at least partially arranged in parallel or at an acute angle to the exhaust gas flow direction 7. Here, it is conceivable that in the connection region 2, the at least partially parallel connection section 5 is at least partially separated by a separating plate 19 from a main flow path 20 of the exhaust gas. In order to connect the connection section 5 fluidically to the connection region 2, it is advantageous to provide the separation plate 19, if necessary, with at least one recess 21, 21 '.

Dabei ist es besonders vorteilhaft, wie in Fig. 5 dargestellt, den Anbindungsbereich 2 in Art eines, insbesondere ovalen oder runden, Doppelrohres 22 auszubilden, wobei das Doppelrohr 22 aus zwei D-förmigen Rohrhälften 23,24 aufgebaut sein kann, zwischen denen eine Trennwand 19 angeordnet sein kann. Diese Trennwand 19 kann wie schon oben beschrieben Aussparungen 21, 21' aufweisen, damit der an einer ersten Rohrhälfte 23 angeschlossene Verbindungsabschnitt 5 des Aktuators 4 fluidisch mit der an einer zweiten Rohrhälfte 24 angeschlossenen Abgasanlage 3 verbunden ist. Durch diese parallele Führung des Verbindungsabschnittes 5 und des Hauptströmungspfades 20 des Abgases ist ebenfalls eine exzellente thermische Entkopplung bei gleichbleibend guter akustischer Anbindung des Aktuators 4 zu der Abgasanlage 3 möglich.It is particularly advantageous, as in Fig. 5 shown to form the connection region 2 in the manner of a, in particular oval or round, double tube 22, wherein the double tube 22 may be constructed of two D-shaped tube halves 23,24, between which a partition wall 19 may be arranged. As already described above, this partition wall 19 can have recesses 21, 21 ', so that the connecting section 5 of the actuator 4 connected to a first pipe half 23 is fluidically connected to the exhaust system 3 connected to a second pipe half 24. By this parallel guidance of the connecting section 5 and the main flow path 20 of the exhaust gas is also an excellent thermal decoupling with a consistently good acoustic connection of the actuator 4 to the exhaust system 3 is possible.

Alle vorhergehend beschriebenen konstruktiven Maßnahmen können auch beliebig zueinander kombiniert werden, um eine optimale thermische Entkopplung des Aktuators 4 von der Abgasanlage 3 herzustellen. So ist es denkbar, dass ein Doppelrohr gemäß Fig. 5 zu einer zumindest teilweisen Aufweitung 11 im Anbindungsbereich 2 führt. Eine solche Konstruktion der Verbindungsanordnung 1 hat auch eine durch die Trennwand 19 verursachte Abdeckung 12 der Anbindungsöffnung 6 zur Folge. Des Weiteren kann eine solche Ausführungsform um eine Rampe 13 gemäß Fig. 3 erweitert werden. Somitsindje nach Bedarf sämtliche konstruktive Maßnahmen in beliebiger Art und Weise zueinander kombinierbar ohne den Rahmen der vorliegenden Erfindung zu verlassen.All of the constructive measures described above can also be combined as desired with one another in order to produce optimal thermal decoupling of the actuator 4 from the exhaust system 3. So it is conceivable that a double pipe according to Fig. 5 leads to an at least partial expansion 11 in the connection area 2. Such a construction of the connection arrangement 1 also has a cover 12 caused by the partition wall 19 of the connection opening 6. Furthermore, such an embodiment can be realized around a ramp 13 according to FIG Fig. 3 be extended. Somitsindje as needed, all design measures in any manner combined with each other without departing from the scope of the present invention.

Eine Abgasanlage mit einer solchen Verbindungsanordnung 1 kann so ausgebildet werden, dass der als aktiver Schalldämpfer ausgebildete Aktuator 4 bei reduzierter Länge des Verbindungsabschnittes 5 eine sehr gute thermische Entkopplung des Aktuators 4 von der Abgasanlage 3 aufweist, ohne dass die schalldämpfende Wirkung des Aktuators beeinträchtigt wird.An exhaust system with such a connection arrangement 1 can be formed so that the trained as an active muffler actuator 4 at a reduced length of the connecting portion 5 has a very good thermal decoupling of the actuator 4 of the exhaust system 3, without the sound-absorbing effect of the actuator is impaired.

Des Weiteren ist durch zumindest einige der oben beschriebenen konstruktiven Maßnahmen eine Reduktion der Strömungsgeräusche ermöglicht. Auch kann durch zumindest einige der konstruktiven Maßnahmen eine Reduktion des durch den als aktiven Schalldämpfer ausgebildeten Aktuators 4 hervorgerufenen Strömungswiderstandes bzw. Gegendruckes erreicht werden.Furthermore, a reduction of the flow noise is made possible by at least some of the constructive measures described above. Also, by at least some of the design measures, a reduction of the caused by the active silencer actuator 4 caused flow resistance or back pressure can be achieved.

Claims (4)

  1. Exhaust gas system (3) of a combustion engine, in particular of a motor vehicle,
    - with an actuator (4) adapted as an active silencer,
    - with a tying region (2) on the Exhaust gas system side,
    - with a feeding pipe portion (8) arranged upstream the tying region (2) with respect to an exhaust gas flow direction (7),
    - with a discharging pipe portion (9) arranged downstream the tying region (2) in an exhaust gas flow direction (7),
    - wherein the actuator (4) is connected to the exhaust gas system (3) by means of a connection arrangement (1),
    - wherein the connection arrangement (1) comprises a connecting portion (5) arranged between the actuator (4) and the tying region (2) for spacing the actuator (4) with respect to the exhaust gas system (3),
    - wherein in the tying region (2) at least one change (11, 17) of a flow cross section compared with at least the feeding pipe portion (8) is formed,
    - wherein the tying region (2) is formed as a double pipe (22), in which between two pipe halves (23, 24) a separating wall (19) is arranged,
    characterized in that the double pipe (22) comprises at least one recess (21, 21') in its separating wall (19) formed between the two pipe halves (23, 24).
  2. Exhaust gas system according to claim 1,
    characterized in that,
    the tying region (2) on the exhaust gas system side comprises an expansion (11) of the flow cross section compared with at least the feeding pipe portion (8).
  3. Exhaust gas system according to one of the preceding claims,
    characterized in that,
    the connecting portion (5) is arranged at least partially parallel or at an acute angle with respect to the exhaust gas flow direction (7).
  4. Exhaust gas system according to one of the preceding claims,
    characterized in that,
    the double pipe (22) is formed oval or round.
EP10162972.3A 2009-07-10 2010-05-17 Exhaust system and associated connection to an actuator Active EP2287451B2 (en)

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US20110005857A1 (en) 2011-01-13
EP2287451A1 (en) 2011-02-23
EP2287451B1 (en) 2013-10-30
DE102009032553A1 (en) 2011-01-20

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