EP3004577A1 - Exhaust gas system for an internal combustion engine and method for operating the exhaust gas system - Google Patents

Exhaust gas system for an internal combustion engine and method for operating the exhaust gas system

Info

Publication number
EP3004577A1
EP3004577A1 EP14719765.1A EP14719765A EP3004577A1 EP 3004577 A1 EP3004577 A1 EP 3004577A1 EP 14719765 A EP14719765 A EP 14719765A EP 3004577 A1 EP3004577 A1 EP 3004577A1
Authority
EP
European Patent Office
Prior art keywords
exhaust
exhaust gas
exhaust system
internal combustion
combustion engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14719765.1A
Other languages
German (de)
French (fr)
Other versions
EP3004577B1 (en
Inventor
Rainer Drees
Christian Eichmüller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP3004577A1 publication Critical patent/EP3004577A1/en
Application granted granted Critical
Publication of EP3004577B1 publication Critical patent/EP3004577B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F01N13/04—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 silencers in parallel, e.g. having interconnections for multi-cylinder engines
    • 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/023—Helmholtz resonators
    • 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/026—Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage
    • 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/166—Silencing apparatus characterised by method of silencing by using movable parts for changing gas flow path through the silencer or for adjusting the dimensions of a chamber or a pipe
    • 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/168—Silencing apparatus characterised by method of silencing by using movable parts for controlling or modifying silencing characteristics only
    • 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
    • F01N13/02—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 silencers 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap

Definitions

  • the invention relates to an exhaust system for an internal combustion engine with the features of the preamble of patent claim 1 and method for operating the exhaust system according to the features of the claims 5 to 7.
  • an exhaust system of an internal combustion engine is known with a first cylinder group of the internal combustion engine associated first exhaust system and with a second cylinder group of the internal combustion engine associated second exhaust system.
  • Each exhaust gas line has in each case an exhaust gas purification device and a first exhaust silencer arranged downstream of the respective exhaust gas purification device, and a second silencer arranged downstream of the respective first silencer and an exhaust gas end pipe arranged downstream of the respective second silencer.
  • a disadvantage of this known prior art is the fact that the damping resonator of the muffler is not variably adjustable.
  • Further mufflers for exhaust systems are generally known from the prior art, which operate on the absorption and / or reflection principle.
  • the development of such a muffler usually means finding the best possible compromise between muzzle noise (volume after the tailpipe tailpipe), exhaust back pressure and required muffler volume.
  • silencer with one or more movable closure elements or shut-off devices, such as an exhaust flap, executed to allow different flow paths in the exhaust pipe of the silencer system.
  • two, three or even four exhaust system tailpipes are often provided.
  • the arrangement of the closure elements disadvantageously leads to the fact that, depending on the position of the closure element, it is no longer possible to flow exhaust gas through all the exhaust system tailpipes or tailpipe branching elements.
  • Object of the present invention is to avoid the disadvantages mentioned above and at the same time introduce a variability in the damping properties of the silencer system.
  • the inventive design of the exhaust system has a structure advantageous with respect to the exhaust backpressure. Due to the construction according to the invention, one or both shut-off valves can also be closed at the same time without a substantial increase in the exhaust backpressure. Compared with conventional exhaust systems exists with open shut-off devices, such. B. exhaust valves a minimum or hardly measurable throttling (increase in the exhaust backpressure), since the entire exhaust and damping tube volume is used to the end of the exhaust system. By a slightly different structure, the shut-off valves can also be shifted in time to improve a subjective hearing impression during the switching phase. By staggered switching the two shut-off devices can be reduced to conspicuous acoustic level jumps in an advantageous manner.
  • the very low exhaust back pressure of the exhaust system due to the inventive design has a very positive effect.
  • the volumes of the first silencer and the second silencer can also be subsequently changed.
  • one or more possibly necessary resonators without much effort while maintaining the symmetry in a simple manner be integrated into the exhaust system.
  • the silencer can also be constructed very favorably.
  • the silencer housing can be implemented, for example, as a cost-effective coil damper or shell construction.
  • the two side parts can be designed as a common part.
  • the upper and lower shell can each be made as a common part.
  • the exhaust pipes (FIG. 1, region a) can be manufactured and installed as equal components.
  • the Y-branch elements of the exhaust pipes to the damping tubes can be implemented, for example, as an IHU molding (hydroforming). It can thus be used as a common part before and after the obturator and on both sides of the muffler.
  • damping tubes with perforation which are guided through the muffler (Fig. 1, area d), are also implemented as equal parts. If a resonator is required, the required partitions for both sides can also be implemented as a common part.
  • the identical mounting device can be used for the pre-assembly of the Y-branch elements and the shut-off devices for both sides of the exhaust system.
  • FIG. 1 shows schematically an exhaust system according to the invention.
  • Fig. 2 shows the exhaust system according to the invention with two closed shut-off devices.
  • Fig. 3 shows the exhaust system according to the invention with a closed and an open obturator.
  • Fig. 4 shows the exhaust system according to the invention with two open
  • Fig. 1 shows an end portion of an exhaust system 1 according to the invention for an internal combustion engine, not shown, with at least a first and a second cylinder, also not shown.
  • the first and the second cylinder are representative of cylinder groups of the internal combustion engine.
  • the first cylinder is a first exhaust pipe 2 and the second cylinder is associated with a second exhaust pipe 3. Further, the first exhaust pipe 2, a first muffler 4 and the second exhaust pipe 3, a second muffler 5 is assigned.
  • a second damping pipe 3 ' branches from the first exhaust pipe 2 upstream of a first obturator 6 from a first damping tube 2 ', which is guided by the first muffler 4 and flows into the second exhaust pipe 3 downstream of a second obturator 7 and that of the second exhaust pipe 3 upstream of the second obturator 7, a second damping pipe 3 'branches off, which is guided through the second silencer 5 and opens into the first exhaust pipe 2 downstream of the first obturator 6.
  • Flow directions of the exhaust gas are shown in FIGS. 2 to 4, which are shown by arrows.
  • the first damping tube 2 'and the second damping tube 3' in the volume of the first muffler 4 and in the region of the second muffler 5 a perforation 11 for emitting sound emissions in the muffler 4, 5 for frequency-selective damping the sound pressure level.
  • the first and the second obturator 6, 7 is an exhaust valve, in other embodiments, it may also be for example rollers.
  • the first and the second muffler 4, 5 are arranged in a common housing 8 for the sake of common parts. In another embodiment, they may also have more expensive, separate housings.
  • the first damping tube 2 'in the present exemplary embodiment has a first resonator chamber 9 and the second damping tube 3' is assigned a second resonator chamber 10.
  • An acoustic coupling between the first damping tube 2 'and the first resonator chamber 9 or the second damping tube 3' and the second resonator chamber 10 takes place in each case by a Helmholtz resonator numbered 12.
  • the first and second resonator chambers 9, 10 are integrated into the common housing 8.
  • the resonator chambers 9, 10 can also be represented in separate housings.
  • the first and second resonator chambers 9, 10 can also be designed as reflection chambers.
  • the muffler housing 8 can be implemented, for example, as a cost-effective coil damper or in shell construction. When implemented as a winding damper, the two side parts can be designed as a common part. In shell construction, the upper and lower shell can each be made as a common part.
  • the exhaust pipes 2, 3 (FIG. 1, region a) can be manufactured and installed as equal components.
  • the Y-branch elements of the exhaust pipes to the damping tubes can be implemented for example as an IHU molding (hydroforming). It can thus be used as a common part before and after the shut-off elements 6, 7 and on both sides of the muffler 4, 5.
  • the required partitions for both sides can also be implemented as a common part.
  • the identical mounting device can be used for the pre-assembly of the Y-branch elements and the shut-off elements 6, 7 for both sides of the exhaust system 1.
  • Figures 2 to 4 show the same Abgasaniage as Fig. 1, but without the first and the second resonator chamber 9, 10, which may also be designed as a reflection chambers.
  • FIG. 2 shows the exhaust system 1 according to the invention with a setting for a first operating method, wherein the first and the second shut-off elements 6, 7 are closed.
  • a maximum sound attenuation for the exhaust system 1 is achieved.
  • a flow direction of the exhaust gas is indicated by arrows.
  • Fig. 3 shows the exhaust system 1 according to the invention with a setting for a second operating method, wherein the first obturator 6 is closed and the second obturator 7 is opened.
  • a setting for a second operating method wherein the first obturator 6 is closed and the second obturator 7 is opened.
  • Fig. 4 shows the exhaust system 1 according to the invention with a setting for a third operating method, wherein the first and the second obturator 6, 7 are open.
  • a minimum sound attenuation for the exhaust system 1 is achieved.
  • the main exhaust gas flow is again shown by thick arrows, a weakened exhaust gas flow is shown by thin arrows.
  • the exhaust system 1 according to the invention has a very advantageous construction with regard to the exhaust backpressure.
  • one or both shut-off elements 6, 7 can also be closed at the same time without a substantial increase in the exhaust backpressure.
  • As exhaust valves a minimum or hardly measurable throttling (increase in the exhaust back pressure), since the entire exhaust gas and Damping tube volume is used to the end of the exhaust system 1.
  • the shut-off valves 6, 7 can also be switched in time to improve a subjective hearing impression during the switching phase.
  • the staggered switching of the two shut-off elements 6, 7 can be reduced to conspicuous, acoustic level jumps in an advantageous manner.
  • the very low exhaust backpressure of the exhaust system 1 due to the embodiment according to the invention has a very positive effect.
  • the volumes of the first muffler 4 and the second muffler 5 can also be subsequently changed.
  • one or more possibly necessary resonator chambers 9, 10, also designed as reflection chambers, can be integrated into the exhaust system 1 in a simple manner without great expense while maintaining the symmetry.

Landscapes

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

Abstract

The invention relates to an exhaust gas system (1) for an internal combustion engine having at least a first and a second cylinder, wherein a first exhaust gas pipe (2) is associated with the first cylinder and a second exhaust gas pipe (3) is associated with the second cylinder and wherein a first muffler (4) is associated with the first exhaust gas pipe (2) and a second muffler (5) is associated with the second exhaust gas pipe (3). A first muffling pipe (2') branches off from the first exhaust gas pipe (2) upstream of a first shut-off element (6), and is fed through the first muffler (4) and leads into the second exhaust gas pipe (3) downstream of a second shut-off element (7), and a second muffling pipe (3') branches off from the second exhaust gas pipe (3) upstream of the second shut-off element (7), is fed through the second muffler (5) and leads into the first exhaust gas pipe (2) downstream of the first shut-off element (6). Because of the embodiment according to the invention, the exhaust gas back pressure in the exhaust gas system is reduced to a minimum.

Description

Abgasanlage für eine Brennkraftmaschine und Verfahren zum Betreiben der Abgasanlage  Exhaust system for an internal combustion engine and method for operating the exhaust system
Beschreibung description
Die Erfindung betrifft eine Abgasanlage für eine Brennkraftmaschine mit den Merkmalen aus dem Oberbegriff des Patentanspruchs 1 sowie Verfahren zum Betreiben der Abgasanlage gemäß den Merkmalen aus den Patentansprüchen 5 bis 7. The invention relates to an exhaust system for an internal combustion engine with the features of the preamble of patent claim 1 and method for operating the exhaust system according to the features of the claims 5 to 7.
Aus der deutschen Offenlegungsschrift DE 10 2009 032 213 A1 ist beispielsweise eine Abgasanlage einer Brennkraftmaschine bekannt mit einem einer ersten Zylindergruppe der Brennkraftmaschine zugeordneten ersten Abgasstrang und mit einem einer zweiten Zylindergruppe der Brennkraftmaschine zugeordneten zweiten Abgasstrang. Jeder Abgasstrang weist jeweils eine Abgasreinigungseinrichtung sowie einen der jeweiligen Abgasreinigungseinrichtung nachgeordneten ersten Schalldämpfer auf sowie einen dem jeweiligen ersten Schalldämpfer nachgeordneten zweiten Schalldämpfer und ein dem jeweiligen zweiten Schalldämpfer nachgeordnetes Abgasendrohr auf. From the German patent application DE 10 2009 032 213 A1, for example, an exhaust system of an internal combustion engine is known with a first cylinder group of the internal combustion engine associated first exhaust system and with a second cylinder group of the internal combustion engine associated second exhaust system. Each exhaust gas line has in each case an exhaust gas purification device and a first exhaust silencer arranged downstream of the respective exhaust gas purification device, and a second silencer arranged downstream of the respective first silencer and an exhaust gas end pipe arranged downstream of the respective second silencer.
Nachteilig an diesem bekannten Stand der Technik ist die Tatsache, dass der Dämpfungsresonator des Schalldämpfers nicht variabel einstellbar ist. Weiter sind aus dem Stand der Technik allgemein Schalldämpfer für Abgasanlagen bekannt, die nach dem Absorptions- und/oder Reflexionsprinzip arbeiten. Die Entwicklung eines solchen Schalldämpfers bedeutet in der Regel das Auffinden des bestmöglichen Kompromisses zwischen Mündungsgeräusch (Lautstärke nach dem Abgasanlagen-Endrohr), Abgasgegendruck und benötigtem Schalldämpfervolumen. Zur Umgehung einer solchen Kompromisslösung werden häufig Schalldämpfer mit einem oder mehreren beweglichen Verschlusselementen oder Absperrorganen, wie beispielsweise einer Abgasklappe, ausgeführt, um unterschiedliche Strömungswege in der Abgasrohrleitung der Schalldämpferanlage zu ermöglichen. Bei Schalldämpferanlagen für Brennkraftmaschinen sind oftmals zwei, drei oder auch vier Abgasanlagen-Endrohre vorgesehen. Bei den aus dem Stand der Technik bekannten Schalldämpferausführungen führt die Anordnung der Verschlusselemente in nachteiliger Weise dazu, dass je nach Stellung des Verschlusselementes nicht mehr alle Abgasanlagen-Endrohre oder auch Endrohrver- zweigungselemente mit Abgas durchströmt werden. A disadvantage of this known prior art is the fact that the damping resonator of the muffler is not variably adjustable. Further mufflers for exhaust systems are generally known from the prior art, which operate on the absorption and / or reflection principle. The development of such a muffler usually means finding the best possible compromise between muzzle noise (volume after the tailpipe tailpipe), exhaust back pressure and required muffler volume. To circumvent such a compromise solution often silencer with one or more movable closure elements or shut-off devices, such as an exhaust flap, executed to allow different flow paths in the exhaust pipe of the silencer system. In silencer systems for internal combustion engines, two, three or even four exhaust system tailpipes are often provided. In the case of the silencer designs known from the prior art, the arrangement of the closure elements disadvantageously leads to the fact that, depending on the position of the closure element, it is no longer possible to flow exhaust gas through all the exhaust system tailpipes or tailpipe branching elements.
Dieser Stand der Technik hat jedoch folgende Nachteile: However, this prior art has the following disadvantages:
«♦ Irritation beim Kunden, da nicht aus allen Abgasanlagen-Endrohren Abgas austritt (sichtbar bei niedriger Außentemperatur und am unterschiedlichen Verschmutzungsgrad der sichtbaren Endrohre); « ♦ irritation at the customer, since exhaust gas does not escape from all exhaust tailpipes (visible at low outside temperature and at the different degree of contamination of the visible tailpipes);
- Hoher Abgasgegendruck durch einen Engpass im Abgasanlagen- Endrohr;  - High exhaust back pressure through a bottleneck in the exhaust system tailpipe;
-#· Strömungsrauschen durch Engpass im Abgasanlagen-Endrohr;  - # · Flow noise due to bottleneck in exhaust system tailpipe;
-> Wärmespannung zwischen kaltem und heißem Abgasanlagen- Endrohr (Gefahr der Rissbildung);  -> thermal stress between cold and hot exhaust tailpipe (risk of cracking);
- Aufwendige Führung der Dämpfungsrohre bei der Schalldämpferanlage;  - Elaborate management of the damping tubes at the silencer system;
-> Hohes Gewicht der Schalldämpferanlage;  -> High weight of the silencer system;
· Hohe Herstellkosten der Schalldämpferanlage; Klappen sind üblicher Weise nur bedingt getrennt bzw. zeitlich versetzt zu schalten; dies führt zu einem deutlichen Abgasgegendruckanstieg in einem Abgasstrang. · High manufacturing costs of the silencer system; Flaps are usually only partially separated or shifted in time; This leads to a significant increase in exhaust gas backpressure in an exhaust gas system.
Aufgabe der vorliegenden Erfindung ist es, die oben genannten Nachteile zu vermeiden und gleichzeitig eine Variabilität in den Dämpfungseigenschaften der Schalldämpferanlage einzubringen. Object of the present invention is to avoid the disadvantages mentioned above and at the same time introduce a variability in the damping properties of the silencer system.
Diese Aufgabe wird vorrichtungsmäßig durch die Merkmale im kennzeichnenden Teil des Patentanspruchs 1 und verfahrensmäßig durch die Merkmale der Patentansprüche 5 bis 7 gelöst. This object is achieved by the device in the characterizing part of patent claim 1 and procedurally by the features of claims 5 to 7.
Durch die erfindungsgemäße Ausgestaltung der Abgasanlage werden sämtliche oben genannten Probleme vermieden. Die Abgasanlage hat einen bezüglich des Abgasgegendruckes vorteilhaften Aufbau. Durch den erfindungsgemäßen Aufbau können ein oder beide Absperrorgane, auch gleichzeitig verschlossen werden ohne eine wesentliche Steigerung des Abgasgegendrucks. Gegenüber herkömmlichen Abgasanlagen besteht bei geöffneten Absperrorganen, wie z. B. Abgasklappen eine minimale bzw. kaum messbare Drosselung (Anhebung des Abgasgegendrucks), da das gesamte Abgas- und Dämpfungsrohrvolumen bis zum Ende der Abgasanlage genutzt wird. Durch einen etwas geänderten Aufbau können die Absperrorgane auch zeitlich versetzt geschaltet werden, um einen subjektiven Gehöreindruck während der Schaltphase zu verbessern. Durch das versetzte Umschalten der beiden Absperrorgane können zu auffällige akustische Pegelsprünge in vorteilhafter Weise reduziert werden.  The inventive design of the exhaust system, all the above problems are avoided. The exhaust system has a structure advantageous with respect to the exhaust backpressure. Due to the construction according to the invention, one or both shut-off valves can also be closed at the same time without a substantial increase in the exhaust backpressure. Compared with conventional exhaust systems exists with open shut-off devices, such. B. exhaust valves a minimum or hardly measurable throttling (increase in the exhaust backpressure), since the entire exhaust and damping tube volume is used to the end of the exhaust system. By a slightly different structure, the shut-off valves can also be shifted in time to improve a subjective hearing impression during the switching phase. By staggered switching the two shut-off devices can be reduced to conspicuous acoustic level jumps in an advantageous manner.
Bezüglich Leistung und Dynamik (Ansprechverhalten der Brennkraftmaschine) wirkt sich der aufgrund der erfindungsgemäßen Ausgestaltung sehr niedrige Abgasgegendruck der Abgasanlage sehr positiv aus. Für leichte akustische Anpassungen können die Volumina des ersten Schalldämpfers und des zweiten Schalldämpfers auch nachträglich geändert werden. Zudem können ein oder mehrere eventuell notwendige Resonatoren ohne großen Aufwand unter Beibehaltung der Symmetrie in einfacher Weise in die Abgasanlage integriert werden. With regard to power and dynamics (response of the internal combustion engine), the very low exhaust back pressure of the exhaust system due to the inventive design has a very positive effect. For slight acoustic adjustments, the volumes of the first silencer and the second silencer can also be subsequently changed. In addition, one or more possibly necessary resonators without much effort while maintaining the symmetry in a simple manner be integrated into the exhaust system.
Durch den symmetrischen Aufbau der Abgasanlage kann darüber hinaus der Schalldämpfer sehr günstig aufgebaut werden. Due to the symmetrical design of the exhaust system, the silencer can also be constructed very favorably.
Viele Komponenten der Abgasanlage können als günstige Gleichteile gefertigt bzw. verwendet werden: Many components of the exhaust system can be manufactured or used as cheap common parts:
Das Schalldämpfergehäuse kann beispielsweise als kostengünstiger Wickeldämpfer oder in Schalenbauweise umgesetzt werden. Bei einer Umsetzung als Wickeldämpfer können die beiden Seitenteile als Gleichteile ausgeführt werden. In Schalenbauweise können die Ober- und die Unterschale jeweils als Gleichteil ausgeführt werden. The silencer housing can be implemented, for example, as a cost-effective coil damper or shell construction. When implemented as a winding damper, the two side parts can be designed as a common part. In shell construction, the upper and lower shell can each be made as a common part.
Die Abgasrohre (Fig. 1 , Bereich a) können als Gleichbauteile hergestellt und verbaut werden. The exhaust pipes (FIG. 1, region a) can be manufactured and installed as equal components.
Die Y-Verzweigungselemente von den Abgasrohren zu den Dämpfungsrohren (Fig. 1 , Bereich b bis zum / ab dem Absperrorgan) können beispielsweise als IHU-Formteil (Innenhochdruckumformen) umgesetzt werden. Es kann somit als Gleichteil vor und nach dem Absperrorgan sowie an beiden Seiten der Schalldämpfer verwendet werden. The Y-branch elements of the exhaust pipes to the damping tubes (Fig. 1, area b to / from the obturator) can be implemented, for example, as an IHU molding (hydroforming). It can thus be used as a common part before and after the obturator and on both sides of the muffler.
Ebenso verhält es sich mit der Rohrverzweigung für die Endrohrverzwei- gungselemente (Fig. 1 , Bereich c). Diese können ebenfalls als Gleichteil für beide Seiten ausgeführt werden. The situation is similar with the pipe branching for the tail pipe branching elements (FIG. 1, area c). These can also be executed as a common part for both sides.
Die Dämpfungsrohre mit Perforation, welche durch den Schalldämpfer geführt werden (Fig. 1 , Bereich d), sind ebenfalls als Gleichteile umsetzbar. Sollte ein Resonator benötigt werden, können die benötigten Trennwände für beide Seiten ebenfalls als Gleichteil umgesetzt werden. The damping tubes with perforation, which are guided through the muffler (Fig. 1, area d), are also implemented as equal parts. If a resonator is required, the required partitions for both sides can also be implemented as a common part.
Auch für die Fertigung lassen sich auf Grund der Gleichteile für die Abgasanlage Montagewerkzeuge einsparen. Je nachdem wie die Fertigung eines Herstellers oder Lieferanten aufgebaut ist, kann für die Vormontage der Y- Verzweigungselemente und der Absperrorgane für beide Seiten der Abgasanlage die identische Montagevorrichtung verwendet werden. Also for the production can be saved due to the common parts for the exhaust system assembly tools. Depending on how the production of a manufacturer or supplier is constructed, the identical mounting device can be used for the pre-assembly of the Y-branch elements and the shut-off devices for both sides of the exhaust system.
Alle oben genannten Punkte führen zu einer signifikanten Reduzierung der Werkzeug- und Herstellkosten für die erfindungsgemäße Abgasanlage. All of the above points lead to a significant reduction of the tool and manufacturing costs for the exhaust system according to the invention.
Durch den großen Anteil von Gleichteilen und der Reduzierung von Einzelteilvarianten lässt sich zudem ein eventuell gewünschter Leichtbau deutlich einfacher realisieren. Due to the large proportion of identical parts and the reduction of individual part variants, it is also possible to realize a possibly desired lightweight construction much more easily.
Die Ausgestaltungen gemäß den Patentansprüchen 2 bis 4 sind besonders bevorzugte Ausführungsvarianten, The embodiments according to claims 2 to 4 are particularly preferred embodiments,
Mit dem Verfahren zum Betreiben einer Abgasanlage für eine Brennkraftmaschine gemäß Patentanspruch 5 wird eine minimale Schalldämpfung erzielt. With the method for operating an exhaust system for an internal combustion engine according to claim 5, a minimum sound attenuation is achieved.
Mit dem Verfahren zum Betreiben einer Abgasanlage für eine Brennkraftmaschine gemäß Patentanspruch 6 wird eine mittlere Schalldämpfung erzielt. With the method for operating an exhaust system for an internal combustion engine according to claim 6, an average sound attenuation is achieved.
Mit dem Verfahren zum Betreiben einer Abgasanlage für eine Brennkraftmaschine gemäß Patentanspruch 7 wird eine maximale Schalldämpfung erzielt. With the method for operating an exhaust system for an internal combustion engine according to claim 7 maximum sound attenuation is achieved.
Im Folgenden werden eine erfindungsgemäße Abgasanlage und drei Verfahren zum Betreiben der erfindungsgemäßen Abgasanlage in vier Figuren näher erläutert. Fig. 1 zeigt schematisch eine erfindungsgemäße Abgasanlage. In the following, an exhaust system according to the invention and three methods for operating the exhaust system according to the invention are explained in more detail in four figures. Fig. 1 shows schematically an exhaust system according to the invention.
Fig. 2 zeigt die erfindungsgemäße Abgasanlage mit zwei geschlossenen Absperrorganen. Fig. 2 shows the exhaust system according to the invention with two closed shut-off devices.
Fig. 3 zeigt die erfindungsgemäße Abgasanlage mit einem geschlossenen und einem geöffneten Absperrorgan. Fig. 3 shows the exhaust system according to the invention with a closed and an open obturator.
Fig. 4 zeigt die erfindungsgemäße Abgasanlage mit zwei geöffneten Fig. 4 shows the exhaust system according to the invention with two open
Absperrorganen.  Shutoff valves.
Im Folgenden gelten in den Fig. 1 bis 4 für gleiche Bauelemente die gleichen Bezugsziffern. In the following, the same reference numerals apply in FIGS. 1 to 4 for identical components.
Fig. 1 zeigt einen Endabschnitt einer erfindungsgemäßen Abgasanlage 1 für eine nicht dargestellte Brennkraftmaschine mit zumindest einem ersten und einem zweiten, ebenfalls nicht dargestellten Zylinder. Der erste und der zweite Zylinder stehen stellvertretend auch für Zylindergruppen der Brennkraftmaschine. Dem ersten Zylinder ist ein erstes Abgasrohr 2 und dem zweiten Zylinder ist ein zweites Abgasrohr 3 zugeordnet. Weiter ist dem ersten Abgasrohr 2 ein erster Schalldämpfer 4 und dem zweiten Abgasrohr 3 ein zweiter Schalldämpfer 5 zugeordnet. Erfindungsgemäß zweigt von dem ersten Abgasrohr 2 stromauf eines ersten Absperrorgans 6 ein erstes Dämpfungsrohr 2' ab, das durch den ersten Schalldämpfer 4 geführt ist und in das zweite Abgasrohr 3 stromab eines zweiten Absperrorgans 7 mündet und dass von dem zweiten Abgasrohr 3 stromauf des zweiten Absperrorgans 7 ein zweites Dämpfungsrohr 3' abzweigt, das durch den zweiten Schalldämpfer 5 geführt ist und in das erste Abgasrohr 2 stromab des ersten Absperrorgans 6 mündet. Strömungsrichtungen des Abgases sind den Fig. 2 bis 4 entnehmbar, die durch Pfeile dargestellt sind. Wie aus dem Stand der Technik bekannt, weisen das erste Dämpfungsrohr 2' und das zweite Dämpfungsrohr 3' im Volumen des ersten Schalldämpfers 4 und im Bereich des zweiten Schalldämpfers 5 eine Perforation 11 auf zur Abgabe von Schallemissionen in die Schalldämpfer 4, 5 zur frequenzselektiven Dämpfung des Schalldruckpegels. Fig. 1 shows an end portion of an exhaust system 1 according to the invention for an internal combustion engine, not shown, with at least a first and a second cylinder, also not shown. The first and the second cylinder are representative of cylinder groups of the internal combustion engine. The first cylinder is a first exhaust pipe 2 and the second cylinder is associated with a second exhaust pipe 3. Further, the first exhaust pipe 2, a first muffler 4 and the second exhaust pipe 3, a second muffler 5 is assigned. According to the invention branches from the first exhaust pipe 2 upstream of a first obturator 6 from a first damping tube 2 ', which is guided by the first muffler 4 and flows into the second exhaust pipe 3 downstream of a second obturator 7 and that of the second exhaust pipe 3 upstream of the second obturator 7, a second damping pipe 3 'branches off, which is guided through the second silencer 5 and opens into the first exhaust pipe 2 downstream of the first obturator 6. Flow directions of the exhaust gas are shown in FIGS. 2 to 4, which are shown by arrows. As known from the prior art, the first damping tube 2 'and the second damping tube 3' in the volume of the first muffler 4 and in the region of the second muffler 5 a perforation 11 for emitting sound emissions in the muffler 4, 5 for frequency-selective damping the sound pressure level.
Im vorliegenden Ausführungsbeispiel handelt es sich bei dem ersten und dem zweiten Absperrorgan 6, 7 um eine Abgasklappe, in anderen Ausführungsbeispielen können es auch beispielsweise Walzen sein. In the present embodiment, the first and the second obturator 6, 7 is an exhaust valve, in other embodiments, it may also be for example rollers.
In dem vorliegenden Ausführungsbeispiel sind der erste und der zweite Schalldämpfer 4, 5 aus Gleichteilegründen in einem gemeinsamen Gehäuse 8 angeordnet. In einem anderen Ausführungsbeispiel können sie auch teurere, separate Gehäuse aufweisen. In the present embodiment, the first and the second muffler 4, 5 are arranged in a common housing 8 for the sake of common parts. In another embodiment, they may also have more expensive, separate housings.
Weiter ist dem ersten Dämpfungsrohr 2' in dem vorliegenden Ausführungsbeispiel eine erste Resonatorkammer 9 und dem zweiten Dämpfungsrohr 3' ist eine zweite Resonatorkammer 10 zugeordnet. Eine akustische Kopplung zwischen dem ersten Dämpfungsrohr 2' und der ersten Resonatorkammer 9 bzw. dem zweiten Dämpfungsrohr 3' und der-zweiten Resonatorkammer 10 erfolgt jeweils durch einen mit 12 bezifferten Helmholtzresonator. Vorzugsweise sind die erste und die zweite Resonatorkammer 9, 10 in das gemeinsame Gehäuse 8 integriert. In einem anderen Ausführungsbeispiel können die Resonatorkammern 9, 10 auch in separaten Gehäusen dargestellt werden. In einem weiteren Ausführungsbeispiel können die erste und die zweite Resonatorkammer 9, 10 auch als Reflexionskammern ausgeführt sein. Furthermore, the first damping tube 2 'in the present exemplary embodiment has a first resonator chamber 9 and the second damping tube 3' is assigned a second resonator chamber 10. An acoustic coupling between the first damping tube 2 'and the first resonator chamber 9 or the second damping tube 3' and the second resonator chamber 10 takes place in each case by a Helmholtz resonator numbered 12. Preferably, the first and second resonator chambers 9, 10 are integrated into the common housing 8. In another embodiment, the resonator chambers 9, 10 can also be represented in separate housings. In a further embodiment, the first and second resonator chambers 9, 10 can also be designed as reflection chambers.
Aufgrund der symmetrischen Auslegung der erfindungsgemäßen Abgasanlage 1 kann diese sehr preisgünstig aufgebaut werden. Viele Komponenten können, wie oben dargestellt, als günstige Gleichteile gefertigt und verwendet werden. Das Schalldämpfergehäuse 8 kann beispielsweise als kostengünstiger Wickeldämpfer oder in Schalenbauweise umgesetzt werden. Bei einer Umsetzung als Wickeldämpfer können die beiden Seitenteile als Gleichteile ausgeführt werden. In Schalenbauweise können die Ober- und die Unterschale jeweils als Gleichteil ausgeführt werden. Due to the symmetrical design of the exhaust system 1 according to the invention, this can be constructed very inexpensively. Many components, as shown above, can be manufactured and used as cheap common parts. The muffler housing 8 can be implemented, for example, as a cost-effective coil damper or in shell construction. When implemented as a winding damper, the two side parts can be designed as a common part. In shell construction, the upper and lower shell can each be made as a common part.
Die Abgasrohre 2, 3 (Fig. 1 , Bereich a) können als Gleichbauteile hergestellt und verbaut werden. The exhaust pipes 2, 3 (FIG. 1, region a) can be manufactured and installed as equal components.
Die Y- Verzweigungselemente von den Abgasrohren zu den Dämpfungsrohren (Fig. 1 , Bereich b bis zum / ab dem Absperrorgan 6, 7) können beispielsweise als IHU-Formteil (Innenhochdruckumformen) umgesetzt werden. Es kann somit als Gleichteil vor und nach den Absperrorganen 6, 7 sowie an beiden Seiten der Schalldämpfer 4, 5 verwendet werden. The Y-branch elements of the exhaust pipes to the damping tubes (Fig. 1, area b to / from the obturator 6, 7) can be implemented for example as an IHU molding (hydroforming). It can thus be used as a common part before and after the shut-off elements 6, 7 and on both sides of the muffler 4, 5.
Ebenso verhält es sich mit der Rohrverzweigung für die nicht separat bezifferten Endrohrverzweigungselemente (Fig. 1 , Bereich c). Diese können ebenfalls als Gleichteil für beide Seiten ausgeführt werden. The situation is similar with the pipe branching for the tailpipe branching elements, which are not numbered separately (FIG. 1, region c). These can also be executed as a common part for both sides.
Die Dämpfungsrohre 3, 4 mit Perforation, welche durch die Schalldämpfer 4, 5 geführt werden (Fig. 1 , Bereich d), sind ebenfalls als Gleichteile umsetzbar. The damping tubes 3, 4 with perforation, which are guided through the muffler 4, 5 (Figure 1, area d), are also implemented as equal parts.
Sollte ein Resonator 9, 10 benötigt werden, können die benötigten Trennwände für beide Seiten ebenfalls als Gleichteil umgesetzt werden. If a resonator 9, 10 are required, the required partitions for both sides can also be implemented as a common part.
Auch für die Fertigung lassen sich auf Grund der Gleichteile für die Abgasanlage 1 Montagewerkzeuge einsparen. Je nachdem wie die Fertigung eines Herstellers oder Lieferanten aufgebaut ist, kann für die Vormontage der Y- Verzweigungselemente und der Absperrorgane 6, 7 für beide Seiten der Abgasanlage 1 die identische Montagevorrichtung verwendet werden. Also for the production can be saved due to the common parts for the exhaust system 1 assembly tools. Depending on how the manufacture of a manufacturer or supplier is constructed, the identical mounting device can be used for the pre-assembly of the Y-branch elements and the shut-off elements 6, 7 for both sides of the exhaust system 1.
Dies führt ebenso zu einer deutlichen Reduzierung von Werkzeugkosten. Die Figuren 2 bis 4 zeigen die gleiche Abgasaniage wie Fig. 1 , jedoch ohne die erste und die zweite Resonatorkammer 9, 10, die auch als Reflexionskammern ausgeführt sein können. This also leads to a significant reduction in tooling costs. Figures 2 to 4 show the same Abgasaniage as Fig. 1, but without the first and the second resonator chamber 9, 10, which may also be designed as a reflection chambers.
Fig. 2 zeigt die erfindungsgemäße Abgasanlage 1 mit einer Einstellung für ein erstes Betriebsverfahren, wobei das erste und das zweite Absperrorgan 6, 7 geschlossen sind. Durch diese Einstellung wird eine maximale Schalldämpfung für die Abgasanlage 1 erzielt. Eine Strömungsrichtung des Abgases ist mit Pfeilen eingezeichnet. FIG. 2 shows the exhaust system 1 according to the invention with a setting for a first operating method, wherein the first and the second shut-off elements 6, 7 are closed. By this setting, a maximum sound attenuation for the exhaust system 1 is achieved. A flow direction of the exhaust gas is indicated by arrows.
Fig. 3 zeigt die erfindungsgemäße Abgasanlage 1 mit einer Einstellung für ein zweites Betriebsverfahren, wobei das erste Absperrorgan 6 geschlossen und das zweite Absperrorgan 7 geöffnet ist. Durch diese Einstellung wird eine mittlere Schalldämpfung für die Abgasanlage 1 erzielt. Die Hauptabgasströmung ist durch dicke Pfeile dargestellt, eine abgeschwächte Abgasströmung ist durch dünne Pfeile dargestellt. Fig. 3 shows the exhaust system 1 according to the invention with a setting for a second operating method, wherein the first obturator 6 is closed and the second obturator 7 is opened. By this setting, an average sound attenuation for the exhaust system 1 is achieved. The main exhaust gas flow is shown by thick arrows, a weakened exhaust gas flow is shown by thin arrows.
Fig. 4 zeigt die erfindungsgemäße Abgasanlage 1 mit einer Einstellung für ein drittes Betriebsverfahren, wobei das erste und das zweite Absperrorgan 6, 7 geöffnet sind. Durch diese Einstellung wird eine minimale Schalldämpfung für die Abgasanlage 1 erzielt. Die Hauptabgasströmung ist wiederum durch dicke Pfeile dargestellt, eine abgeschwächte Abgasströmung ist durch dünne Pfeile dargestellt. Fig. 4 shows the exhaust system 1 according to the invention with a setting for a third operating method, wherein the first and the second obturator 6, 7 are open. By this setting a minimum sound attenuation for the exhaust system 1 is achieved. The main exhaust gas flow is again shown by thick arrows, a weakened exhaust gas flow is shown by thin arrows.
Die erfindungsgemäße Abgasanlage 1 hat einen bezüglich des Abgasgegendruckes sehr vorteilhaften Aufbau. Durch den erfindungsgemäßen Aufbau können ein oder beide Absperrorgane 6, 7, auch gleichzeitig verschlossen werden ohne eine wesentliche Steigerung des Abgasgegendrucks. Gegenüber herkömmlichen Abgasanlagen besteht bei geöffneten Absperrorganen 6, 7, wie z. B. Abgasklappen eine minimale bzw. kaum messbare Drosselung (Anhebung des Abgasgegendrucks), da das gesamte Abgas- und Dämpfungsrohrvolumen bis zum Ende der Abgasanlage 1 genutzt wird. Durch einen etwas geänderten Aufbau können die Absperrorgane 6, 7 auch zeitlich versetzt geschaltet werden, um einen subjektiven Gehöreindruck während der Schaltphase zu verbessern. Durch das versetzte Umschalten der beiden Absperrorgane 6, 7 können zu auffällige, akustische Pegelsprünge in vorteilhafter Weise reduziert werden. The exhaust system 1 according to the invention has a very advantageous construction with regard to the exhaust backpressure. As a result of the design according to the invention, one or both shut-off elements 6, 7 can also be closed at the same time without a substantial increase in the exhaust backpressure. Compared with conventional exhaust systems with open shut-off valves 6, 7, such. As exhaust valves a minimum or hardly measurable throttling (increase in the exhaust back pressure), since the entire exhaust gas and Damping tube volume is used to the end of the exhaust system 1. By a slightly different structure, the shut-off valves 6, 7 can also be switched in time to improve a subjective hearing impression during the switching phase. By the staggered switching of the two shut-off elements 6, 7 can be reduced to conspicuous, acoustic level jumps in an advantageous manner.
Bezüglich Leistung und Dynamik (Ansprechverhalten der Brennkraftmaschine) wirkt sich der aufgrund der erfindungsgemäßen Ausgestaltung sehr niedrige Abgasgegendruck der Abgasanlage 1 sehr positiv aus. Für leichte akustische Anpassungen können die Volumina des ersten Schalldämpfers 4 und des zweiten Schalldämpfers 5 auch nachträglich geändert werden. Zudem können ein oder mehrere eventuell notwendige Resonatorkammern 9, 10, auch als Reflexionskammem ausgeführt, ohne großen Aufwand unter Beibehaltung der Symmetrie in einfacher Weise in die Abgasanlage 1 integriert werden. With regard to power and dynamics (response of the internal combustion engine), the very low exhaust backpressure of the exhaust system 1 due to the embodiment according to the invention has a very positive effect. For slight acoustic adjustments, the volumes of the first muffler 4 and the second muffler 5 can also be subsequently changed. In addition, one or more possibly necessary resonator chambers 9, 10, also designed as reflection chambers, can be integrated into the exhaust system 1 in a simple manner without great expense while maintaining the symmetry.
Bezugszeichenliste: LIST OF REFERENCE NUMBERS
1. Abgasanlage 1st exhaust system
2. erstes Abgasrohr  2. first exhaust pipe
2' erstes Dämpfungsrohr  2 'first damping tube
3. zweites Abgasrohr  3rd second exhaust pipe
3' zweites Dämpfungsrohr  3 'second damping tube
4. erster Schalldämpfer  4. first silencer
5. zweiter Schalldämpfer  5. second silencer
6. erstes Absperrorgan  6. first shut-off device
7. zweites Absperrorgan  7. second obturator
8. Gehäuse  8. Housing
9. erste Resonatorkammer / Reflexionskammer 9. first resonator chamber / reflection chamber
10. zweite Resonatorkammer / Reflexionskammer10. second resonator chamber / reflection chamber
11. Perforation 11. perforation
12. Helmholtz-Resonator  12. Helmholtz resonator
a Abgasrohr a exhaust pipe
b Verzweigungsteil b branching part
c Endrohrverzweigungselement c tailpipe branching element
d Dämpfungsrohr d damping tube

Claims

Abgasanlage für eine Brennkraftmaschine ynd Verfahren zum Betreiben der Abgasanlage Patentansprüche Exhaust system for an internal combustion engine ynd method for operating the exhaust system claims
1. Abgasanlage (1 ) für eine Brennkraftmaschine, mit zumindest einem ersten und einem zweiten Zylinder, wobei dem ersten Zylinder ein erstes Abgasrohr (2) und dem zweiten Zylinder ein zweites Abgasrohr (3) zugeordnet ist und wobei dem ersten Abgasrohr (2) ein erster Schalldämpfer (4) und dem zweiten Abgasrohr (3) ein zweiter Schalldämpfer (5) zugeordnet ist, 1. exhaust system (1) for an internal combustion engine, with at least a first and a second cylinder, wherein the first cylinder a first exhaust pipe (2) and the second cylinder, a second exhaust pipe (3) is associated and wherein the first exhaust pipe (2) a first muffler (4) and the second exhaust pipe (3) is associated with a second muffler (5),
dadurch gekennzeichnet, dass von dem ersten Abgasrohr (2) stromauf eines ersten Absperrorgans (6) ein erstes Dämpfungsrohr (2') abzweigt, das durch den ersten Schalldämpfer (4) geführt ist und in das zweite Abgasrohr (3) stromab eines zweiten Absperrorgans (7) mündet und dass von dem zweiten Abgasrohr (3) stromauf des zweiten Absperrorgans (7) ein zweites Dämpfungsrohr (3') abzweigt, das durch den zweiten Schalldämpfer (5) geführt ist und in das erste Abgasrohr (2) stromab des ersten Absperrorgans (6) mündet. characterized in that from the first exhaust pipe (2) upstream of a first obturator (6) branches off a first damping pipe (2 '), which is guided by the first muffler (4) and in the second exhaust pipe (3) downstream of a second obturator ( 7) and that from the second exhaust pipe (3) upstream of the second obturator (7) branches off a second damping pipe (3 '), which is guided by the second silencer (5) and in the first exhaust pipe (2) downstream of the first obturator (6) opens.
2. Abgasanlage für eine Brennkraftmaschine nach Patentanspruch 1 , dadurch gekennzeichnet, dass der erste und der zweite Schalldämpfer (4, 5) in einem gemeinsamen Gehäuse (8) angeordnet sind. 2. Exhaust system for an internal combustion engine according to claim 1, characterized in that the first and the second silencer (4, 5) in a common housing (8) are arranged.
3. Abgasanlage für eine Brennkraftmaschine nach Patentanspruch 1 oder 2, 3. Exhaust system for an internal combustion engine according to claim 1 or 2,
dadurch gekennzeichnet, dass dem ersten Dämpfungsrohr (2') eine erste Resonatorkammer (9) und dem zweiten Dämpfungsrohr (3') eine zweite Resonatorkammer (10) zugeordnet ist.  characterized in that a first resonator chamber (9) is associated with the first damping tube (2 ') and a second resonator chamber (10) is associated with the second damping tube (3').
4. Abgasanlage für eine Brennkraftmaschine nach Patentanspruch 2 oder4. exhaust system for an internal combustion engine according to claim 2 or
3, 3,
dadurch gekennzeichnet, dass die erste und die zweite Resonatorkammer (4, 5) in das gemeinsame Gehäuse (8) integriert sind.  characterized in that the first and second resonator chambers (4, 5) are integrated in the common housing (8).
5. Verfahren zum Betreiben einer Abgasanlage für eine Brennkraftmaschine nach einem der Patentansprüche 1 bis 4, 5. A method for operating an exhaust system for an internal combustion engine according to one of the claims 1 to 4,
gekennzeichnet durch folgenden Verfahren schritt:  characterized by the following process:
Öffnen des ersten und des zweiten Absperrorgans (6, 7) für eine minimale Schalldämpfung.  Opening the first and second shut-off device (6, 7) for a minimum sound attenuation.
6. Verfahren zum Betreiben einer Abgasanlage für eine Brennkraftmaschine nach einem der Patentansprüche 1 bis 4, 6. A method for operating an exhaust system for an internal combustion engine according to one of the claims 1 to 4,
gekennzeichnet durch folgenden Verfahrenschritt:  characterized by the following process step:
Öffnen des ersten Absperrorgans (6) und Schließen des zweiten Absperrorgans (7) für eine mittlere Schalldämpfung. Verfahren zum Betreiben einer Abgasanlage für eine Brennkraftma- schine nach einem der Patentansprüche 1 bis 4, Opening the first obturator (6) and closing the second obturator (7) for a mean sound attenuation. Method for operating an exhaust system for an internal combustion engine according to one of claims 1 to 4,
gekennzeichnet durch folgenden Verfahrenschritt: characterized by the following process step:
Schließen des ersten und des zweiten Absperrorgans (6, 7) für maximale Schalldämpfung.  Closing the first and second shut-off members (6, 7) for maximum sound attenuation.
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Also Published As

Publication number Publication date
WO2014195062A1 (en) 2014-12-11
DE102013210464A1 (en) 2014-12-11
EP3004577B1 (en) 2018-04-18
US9945280B2 (en) 2018-04-17
US20160024989A1 (en) 2016-01-28
CN105164381B (en) 2018-07-13
CN105164381A (en) 2015-12-16

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