EP1760279B1 - Silencieux pour un système d'échappement - Google Patents

Silencieux pour un système d'échappement Download PDF

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Publication number
EP1760279B1
EP1760279B1 EP06118826A EP06118826A EP1760279B1 EP 1760279 B1 EP1760279 B1 EP 1760279B1 EP 06118826 A EP06118826 A EP 06118826A EP 06118826 A EP06118826 A EP 06118826A EP 1760279 B1 EP1760279 B1 EP 1760279B1
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EP
European Patent Office
Prior art keywords
pipe
switchable
chamber
resonator
muffler according
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.)
Active
Application number
EP06118826A
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German (de)
English (en)
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EP1760279A2 (fr
EP1760279A3 (fr
Inventor
Micha HÖRR
Michael Pommerer
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.)
Eberspaecher Climate Control Systems GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
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.)
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Publication date
Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP1760279A2 publication Critical patent/EP1760279A2/fr
Publication of EP1760279A3 publication Critical patent/EP1760279A3/fr
Application granted granted Critical
Publication of EP1760279B1 publication Critical patent/EP1760279B1/fr
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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
    • 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
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • 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
    • F01N1/161—Silencing apparatus characterised by method of silencing by using movable parts for adjusting resonance or dead chambers or passages to resonance or dead chambers
    • F01N1/163—Silencing apparatus characterised by method of silencing by using movable parts for adjusting resonance or dead chambers or passages to resonance or dead chambers by means of valves
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/14—Plurality of outlet tubes, e.g. in parallel or with different length
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/16—Plurality of inlet tubes, e.g. discharging into different chambers

Definitions

  • the present invention relates to a silencer for an exhaust system of an internal combustion engine, in particular of a motor vehicle.
  • a muffler comprises a housing having at least one exhaust inlet and at least one exhaust outlet.
  • tubes can protrude into the housing on the inlet side and outlet side, it being fundamentally possible to provide at least two tubes on the inlet side or outlet side which lead into or out of the housing parallel to one another.
  • silencers there is generally the problem that the flow through the silencer takes place against a flow resistance which generates a pressure increase in the exhaust system upstream of the silencer. This increase in pressure can significantly affect their performance and efficiency in certain operating conditions of the internal combustion engine. Therefore, it is possible in principle to be able to open and lock at least one of the parallel tubes as required by means of a corresponding control device.
  • the switchable tube closed, while it opens at higher speed or greater load.
  • the flow resistance of the muffler can be considerably reduced.
  • this switching process can be accompanied by an additional noise emission into the environment, since the attenuation of the muffler is basically optimized with regard to operating conditions with low exhaust gas flow.
  • the exhaust system of the internal combustion engine at least in a section of double-flow, so form with two separate, parallel-flow exhaust pipes.
  • a separate muffler is arranged in each of these exhaust pipes.
  • the two silencers have different damping characteristics, so they are tuned to different frequencies or frequency ranges.
  • one of the exhaust pipes can be opened and closed by means of a control flap. With a small exhaust gas flow, the switchable exhaust pipe is blocked, so that only one silencer flows through. For large exhaust gas flows, the switchable exhaust pipe is open so that both mufflers are flowed through.
  • the present invention is concerned with the problem of providing a muffler of the type mentioned, an improved embodiment, which is characterized by an improved damping effect and by an inexpensive manufacturability.
  • the invention is based on the general idea to acoustically couple a switchable tube of the muffler with a damper system, in such a way that the damper system is active on the one hand with the tube open and closed, so unfolds its respective damping effect, and on the other hand with another open pipe Damping characteristic than when the tube is closed.
  • the switchable tube forms a component of an effective damper system even when closed, which changes its damping characteristic when opening the tube, but remains active.
  • the damper system connected to the switchable tube can be designed to be particularly advantageous in such a way that it damps the interfering or the most disturbing frequencies or frequency ranges in both switching states.
  • the damper system has a volume that is acoustically coupled to the at least one switchable tube, so in addition to the volume of the switchable tube is available.
  • This extra volume can be used to realize different Damper types are used, such as a Helmholtz resonator or a ⁇ / 4 resonator or a reflection chamber.
  • This volume can preferably be used for damping relatively low frequencies or frequency ranges.
  • a muffler 1 according to the invention comprises a housing 2 with at least one exhaust gas inlet 3 and at least one exhaust gas outlet 4, 5.
  • the muffler 1 is provided for installation in an exhaust system, not shown here, of an internal combustion engine, also not shown, wherein the internal combustion engine is preferably arranged in a motor vehicle.
  • the housing 2 has only a single exhaust inlet 3, while it has two separate exhaust gas outlets 4, 5.
  • the housing 2 is equipped on its inlet side or on its outlet side with at least two tubes 6, 7.
  • another embodiment is possible in which the two tubes 6, 7 are arranged on the inlet side.
  • the two tubes 6, 7 led out of the housing 2 separately. It is in principle possible that the two tubes 6, 7 are brought together outside the housing 2 to form a common tube. At inlet-side tubes 6, 7 they can branch off from the housing 2 from a common pipe. Likewise, it is basically possible that the two inlet-side or outlet-side tubes 6, 7 are still combined within the housing 2 to form a common tube or branch off from a common tube.
  • One of these tubes 6, 7, here the lower tube 7, is permanently open.
  • a control device 8 is provided, with the aid of which the controllable tube 6 can be opened and closed, that is, at least switchable between an open state and a closed state.
  • the exhaust gases flow z. B. via an inlet pipe 9 through the exhaust gas inlet 3 into the housing 2 and via the permanently open pipe 7 through the associated exhaust gas outlet 5 out of the housing 2 out.
  • the exhaust gas flow is symbolized by arrows, which are drawn by a solid line.
  • the open state of the switchable tube 6 the exhaust gases can also flow out of the housing 2 via the switchable tube 6 through the associated exhaust gas outlet 4, which is symbolized by an arrow drawn with a broken line.
  • the control device 8 may for example have a flap 10 which is arranged in the switchable tube 6 and cooperates with a drive 11.
  • the control device 8 as in the embodiments of Fig. 1 and 3 to 6 be arranged outside the housing 2.
  • the control device 8 as in the embodiment according to Fig. 2 be arranged within the housing 2.
  • the controller 8 may be passive or active.
  • the passive control device 8 controls the controllable tube 6 preferably in Dependence of the prevailing exhaust pressure.
  • the drive 11 may then be formed for example by a return spring, which biases the flap 10 in its closed position. With sufficient exhaust pressure, the flap 10 is pressed and so the controllable tube 6 is opened.
  • an active control device 8 can control the controllable tube 6 as a function of operating parameters of the internal combustion engine, in particular as a function of the speed and / or load of the internal combustion engine. For example, the control device 8 closes the controllable tube 6 at low load or in a lower speed range. At higher load or at a larger speed range then the controllable tube 6 is opened.
  • the switchable tube 6 is acoustically coupled to a damper system 12.
  • This damper system 12 is designed so that it is active in both open and closed switchable tube 6, but has 6 dependent switching characteristics of the switching state of the switchable tube. This means that the damper system 12 has a different damping characteristic when the switchable tube 6 is open than when the switchable tube 6 is closed.
  • the different damping characteristics are characterized by the damping of different frequencies or frequency ranges. The damper system 12 thus attenuates other frequencies or frequency ranges when the switchable tube 6 is closed than when the controllable tube 6 is open.
  • damper system 12 targeted interference frequencies or interference frequency ranges attenuated, which arise when switching the switchable tube 6, so by the changed flow through the muffler 1.
  • the transition within the noise during the switching of the switchable tube 6 can be smoothed, whereby a sudden noise change is avoided or at least greatly attenuated.
  • the housing 2 includes a first chamber 13, through which both tubes 6, 7 are passed. Furthermore, a second chamber 14 is formed in the housing 2, in which the two tubes 6, 7 have their open ends 15, 16. Furthermore, the second chamber 14 communicates with the exhaust gas inlet 3.
  • a third chamber 18 is provided, which is arranged between the two other chambers 13, 14 and through which the two tubes 6, 7 are passed.
  • the third chamber 18 is separated from the first chamber 13 by a partition 19, in particular gas-tight.
  • the third chamber 18 is separated from the second chamber 14 by a partition wall 20, in particular gas-tight.
  • the permanently open tube 7 is acoustically coupled to the third chamber 18. The acoustic coupling is in this case for example by means of a perforation 21 of the wall of the permanently open tube 7 realized within the third chamber 18.
  • the third chamber 18 serves as a reflection chamber and may optionally be filled with a suitable damper material.
  • a suitable damper material instead of a perforation 21, an opening in the wall or an interruption of the permanently open tube 7 may be provided to form the reflection damper.
  • the third chamber 18 can also serve as resonance volume for a Helmholtz resonator; the permanently open pipe 7 is then equipped with a corresponding branch pipe.
  • the damper system 12 has a volume 22 and 23, respectively, which is acoustically coupled to the switchable tube 6.
  • This volume 22, 23 is added to the volume of the switchable tube 6 and is used to achieve the desired damping effect.
  • the volume of the damper system 12 comprises a tube volume 22 of a branch pipe 24 and a chamber volume 23 of the first chamber 13.
  • the branch pipe 24 branches off from the switchable pipe 6 in such a way that it opens inside the first chamber 13.
  • the branch pipe 24 communicates on the one hand with the switchable pipe 6 and on the other hand with the first chamber 13.
  • the damper system 12 with closed switchable pipe 6 comprises a Helmholtz resonator whose resonance chamber is formed by the first chamber 13 and the resonator neck through the branch pipe 24 and the reaching from the open end 15 to a branch point 25 section the switchable tube 6 is formed.
  • the damping effect of a Helmholtz resonator results on the one hand from the volume of the resonance chamber and on the other hand from the volume of the resonator neck.
  • the volume of the resonator neck is itself determined by the neck length and the neck cross section.
  • the effective at closed switchable tube 6 neck length is simplified here indicated by double arrows, namely by an arrow L1, which represents the length of the portion of the controllable tube 6 from the open end 15 to the branching point 25, and by an arrow L2, the length of the Branch pipe 24 represents.
  • the active at the closed switchable tube 6 neck length is thus the sum of the two individual neck lengths L1 + L2.
  • a ⁇ / 4 resonator is formed therein whose resonator length extends from the open end 15 of the switchable tube 6 to the closure point of the switchable tube 6, that is to the flap 10.
  • This resonator length thus corresponds to the sum of the two individual neck lengths L1 + L3, where L3 is the distance between the branching point 25 and the closure point, ie the flap 10.
  • the damper system 12 additionally comprises said ⁇ / 4 resonator.
  • FIG. 2 The embodiment shown differs from that in FIG Fig. 1 shown embodiment only in that the branch pipe 24 is closed at its end remote from the switchable tube 6 end by a bottom 26.
  • the damper system 12 can not build a Helmholtz resonator more by this measure; Rather, a ⁇ / 4 resonator is realized in this embodiment.
  • the effective length of the ⁇ / 4 resonator is defined by the tube length from the open end 15 of the switchable tube 6 to the bottom 26, that is, by the sum of the lengths L1 + L2.
  • the damper system 12 basically comprises two ⁇ / 4 resonators, one of which is active only when the switchable tube 6 is closed, while the other is active even with the switchable tube 6 open, but then has a shorter resonator length.
  • branch pipe 24 and / or the bottom 26 with a leak, so that in principle a communicating connection between the switchable pipe 6 and the first chamber 13 is present.
  • This leakage can increase the bandwidth of the damping effect of the ⁇ / 4 resonator.
  • the volume of the damper system 12 is thus formed exclusively by the tube volume 22 of the branch pipe 24.
  • the chamber volume 23 can be dispensed with for the damper system 12 of the switchable tube 6 and can be used as an example for the permanently open tube 7 associated with the reflection damper.
  • the permanently open tube 7 communicates with the first chamber 13 via its perforation 21.
  • the first chamber 13 may optionally be filled with suitable damper material in this embodiment.
  • an opening in the wall or an interruption of the permanently open tube 7 may be provided to form the reflection damper.
  • the first chamber 13 can then serve as a resonance volume for a Helmholtz resonator; the permanently open pipe 7 is then equipped with a corresponding branch pipe.
  • the branch pipe 24 is at its end remote from the switchable tube 6 with a pinhole 27 provided.
  • the chamber volume 23 can basically serve as resonance volume for a Helmholtz resonator.
  • the further ⁇ / 4 resonator is also active here when the switchable tube 6 is closed, whose resonator length is formed by the sum of the individual lengths L1 + L3.
  • the active lengths are reduced, namely to the single length L2 for the ⁇ / 4 resonator and also to the single length L2 for the Helmholtz resonator.
  • the further ⁇ / 4 resonator is deactivated when the switchable tube 6 is open.
  • the volume of the damper system 12 is formed by both the tube volume 22 and the chamber volume 23.
  • branch pipes 24 may be provided with or without bottom 26 or pinhole 27, which differ in particular by different pipe cross-sections and / or pipe lengths and communicate in particular with the same or different chambers.
  • the volume of the damper system 12 comprises only the chamber volume 23 of the first chamber 13.
  • a branch pipe 24 and thus a pipe volume 22 is not provided in these embodiments.
  • the switchable tube 6 communicates with the first chamber 13.
  • the switchable tube 6 in accordance with the embodiment Fig. 4 an opening 28, in the embodiment according to Fig. 5 a perforation 29 and in the embodiment according to Fig. 6 an interruption 30 on.
  • the damper system 12 each have a Helmholtz resonator whose neck length is formed by the single length L1, ie by the extending from the open end 15 to the "branching" 25 section of the switchable tube.
  • the branch point 25 in this case corresponds to the point at which the communication between the first chamber 13 and the switchable tube 6, and may also be referred to as a connection point 25.
  • the ⁇ / 4 resonators can be active here in the closed state of the switchable tube 6, whose effective length is determined by the sum of the individual lengths L1 + L3.
  • the neck length of the Helmholtz resonator reduces approximately to the value zero.
  • a reflection chamber which has a different damping characteristic than the Helmholtz resonator.
  • connection point 25 and the junction 25 between the switchable tube 6 and the first chamber 13 and the branch pipe 24 from the open end 15 of the switchable tube 6 is spaced. Furthermore, said connection point 25 is arranged between the open end 15 and the actuator, ie the flap 10 of the control device 8. This ensures that the sound to be damped reaches in any case up to the additional volume 22, 23 of the damper system 12.
  • the described Helmholtz resonators and the described ⁇ / 4 resonators and combinations of Helmholtz resonator and ⁇ / 4 resonator have in common that they are not flowed through during operation of the exhaust gases of the exhaust gas flow.
  • the resonators mentioned are thus shunt resonators.
  • the resonators, which operate with a reflection chamber are arranged in the main circuit, that flows through in the operation of the exhaust gases of the exhaust gas flow.
  • the damper system 12 is designed such that it has at least one such shunt resonator both when the switchable tube 6 is closed and when the tube 6 is open.
  • this is a Helmholtz resonator, in the embodiment according to Fig. 2 around a ⁇ / 4 resonator and in the embodiment according to Fig. 3 to a combination of a Helmholtz resonator and a ⁇ / 4-resonator.
  • the damper system 12 in the embodiments of the 4 to 6 Although in principle also at least one shunt resonator, this is only active when the switchable tube 6 is closed.
  • the resonance chamber of the respective Helmholtz resonator is transformed into a reflection chamber.
  • the reflection muffler that worked with it flows through, ie it is arranged in the main circuit.
  • the damping principle is changed by the switching operation of the switchable tube 6, while in the embodiments of the Fig. 1 to 3 the damping principle remains the same in both switching states of the switchable tube 6.
  • the configurations and arrangements of the chambers 13, 14, 18 and the tubes 6, 7, 9 shown here are only exemplary in principle, so that other configurations and arrangements are also possible.
  • the two tubes 6 and 7 need not have their free ends 15, 16 in the same chamber;
  • the inlet pipe 9 does not have to open in the same chamber we the other pipes 6, 7.
  • the inlet pipe 9 open into the middle chamber 18, in which case the associated partition 20 is designed gas-permeable.
  • the permanently open pipe 7 its open End 16 in the middle chamber 18, wherein the permanently open tube 7 may be bent to achieve a particularly large tube length passed through the second chamber 14.

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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)

Claims (15)

  1. Silencieux pour une installation d'échappement d'un moteur à combustion interne, en particulier d'un véhicule automobile,
    - doté d'un carter (2), qui présente au moins une entrée de gaz d'échappement (3) et au moins une sortie de gaz d'échappement (4, 5) et qui présente au moins deux tuyaux (6, 7) côté entrée ou côté sortie, dont au moins l'un peut être commuté avec un dispositif de commande (8) au moins entre une position ouverte et une position fermée et peut être couplée de façon acoustique avec un système amortisseur (12), de telle sorte que le système amortisseur (12) est actif lorsque le tuyau 6) est ouvert et le tuyau (6) est fermé et présente, lorsque le tuyau (6) est ouvert, une autre caractéristique d'amortissement que lorsque le tuyau (6) est fermé,
    - le système d'amortisseur (12) présentant un volume (22, 23) couplé au plan acoustique avec le au moins un tuyau (6) commutable,
    caractérisé en ce que
    - le volume comporte au moins un volume de tuyau (22) d'au moins un tuyau de dérivation (24), qui dévie du au moins un tuyau (6) commutable et communique avec celui-ci,
    - en ce que le volume comporte un volume de chambre (23) d'une première chambre (13) du carter (2), au travers de laquelle le au moins un tuyau (6) commutable est guidé et qui communique avec le au moins un tuyau (6) commutable,
    - en ce que le au moins un tuyau (24) de dérivation communique avec la première chambre (13) du carter (2).
  2. Silencieux selon la revendication 1,
    caractérisé en ce que
    le au moins un tuyau de dérivation (24) présente un cache à trou (27) sur son extrémité éloignée d'au moins un tuyau (6) commutable.
  3. Silencieux selon la revendication 1 ou 2,
    caractérisé en ce que
    la liaison communicante entre le au moins un tuyau (6) commutable et le au moins un tuyau de dérivation (24) et/ou la première chambre (13) est espacée d'une extrémité (15) ouverte, disposée dans le carter (2), du au moins un tuyau (6) commutable.
  4. Silencieux selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que,
    sur les au moins deux tuyaux (6, 7) côté entrée ou côté sortie, au moins un est ouvert en permanence.
  5. Silencieux selon la revendication 4,
    caractérisé en ce que
    le au moins un tuyau (7) ouvert en permanence est guidé à travers la première chambre (13).
  6. Silencieux selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    les au moins deux tuyaux (6, 7) côté entrée et côté sortie présentent leurs extrémités (15, 16) ouvertes dans une seconde chambre (14) du carter (2), qui communique avec le au moins une entrée de gaz d'échappement (3) ou avec le au moins une sortie de gaz d'échappement (4,5).
  7. Silencieux au moins selon la revendication 4,
    caractérisé en ce que
    le au moins un tuyau (7) ouvert en permanence est guidé à travers une troisième chambre (18) et est couplé au plan acoustique avec cette chambre.
  8. Silencieux selon la revendication 7,
    caractérisé en ce que
    le au moins un tuyau (6) commutable est guidée à travers la troisième chambre (18).
  9. Silencieux selon la revendication 7 ou 8,
    caractérisé en ce que
    la troisième chambre (18) est séparée par une cloison de séparation (19) de la première chambre (13) et/ou par une autre cloison de séparation (20) de la seconde chambre (14).
  10. Silencieux selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    - le dispositif de commande (8) présente au moins un clapet (10) disposé dans le au moins un tuyau (6) commutable et à l'intérieur ou à l'extérieur du carter (2) et/ou
    - en ce que le dispositif de commande (8) commande le au moins un tuyau (6) commutable de façon passive en fonction de la pression des gaz d'échappement ou de façon active en fonction du régime et/ou de la charge du moteur à combustion interne.
  11. Silencieux selon l'une quelconque des revendications 1 à 10,
    caractérisé en ce que
    le système d'amortisseur (12) est conçu de telle sorte que des fréquences perturbatrices, qui sont occasionnées lors de la commutation du au moins un tuyau (6) commutable par l'écoulement modifié du silencieux (1), sont atténuées.
  12. Silencieux selon l'une quelconque des revendications 1 à 11,
    caractérisé en ce que
    le système amortisseur (12) comporte un résonateur en dérivation avec le tuyau (6) commutable ouvert et avec le tuyau (6) commutable fermé.
  13. Silencieux selon la revendication 12,
    caractérisé en ce que
    le résonateur en dérivation est respectivement un résonateur de Helmholtz ou un résonateur quart d'onde ou une combinaison de résonateur de Helmholtz et de résonateur de quart d'onde avec le tuyau (6) commutable ouvert et avec le tuyau (6) commutable fermé.
  14. Silencieux selon l'une quelconque des revendications 1 à 13,
    caractérisé en ce que
    le système amortisseur (12) comporte un résonateur quart d'onde avec le tuyau (6) commutable fermé, dont la longueur de résonateur correspond à la distance de l'extrémité (15) ouverte du tuyau (6) commutable à la fermeture du tuyau (6) commutable.
  15. Silencieux selon l'une quelconque des revendications 1 à 14,
    caractérisé en ce que
    les deux tuyaux (6, 7) dévient à l'intérieur ou à l'extérieur du carter (2) d'un tuyau commun ou sont guidés ensemble pour former un tuyau commun.
EP06118826A 2005-09-01 2006-08-11 Silencieux pour un système d'échappement Active EP1760279B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005041692A DE102005041692A1 (de) 2005-09-01 2005-09-01 Schalldämpfer für eine Abgasanlage

Publications (3)

Publication Number Publication Date
EP1760279A2 EP1760279A2 (fr) 2007-03-07
EP1760279A3 EP1760279A3 (fr) 2009-03-11
EP1760279B1 true EP1760279B1 (fr) 2010-10-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06118826A Active EP1760279B1 (fr) 2005-09-01 2006-08-11 Silencieux pour un système d'échappement

Country Status (3)

Country Link
US (1) US7506723B2 (fr)
EP (1) EP1760279B1 (fr)
DE (2) DE102005041692A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2955344A2 (fr) 2014-06-04 2015-12-16 Eberspächer Exhaust Technology GmbH & Co. KG Silencieux
EP3557015A1 (fr) 2018-04-20 2019-10-23 Volvo Car Corporation Silencieux comprenant un résonateur de type helmholtz et véhicule avec ce silencieux

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004040421A1 (de) * 2004-08-19 2006-03-09 J. Eberspächer GmbH & Co. KG Aktiver Abgasschalldämpfer
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US7506723B2 (en) 2009-03-24
DE102005041692A1 (de) 2007-03-15
US20070045043A1 (en) 2007-03-01
EP1760279A2 (fr) 2007-03-07
DE502006008064D1 (de) 2010-11-25
EP1760279A3 (fr) 2009-03-11

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