EP1460243B1 - Acoustic silencing system - Google Patents
Acoustic silencing system Download PDFInfo
- Publication number
- EP1460243B1 EP1460243B1 EP04290399A EP04290399A EP1460243B1 EP 1460243 B1 EP1460243 B1 EP 1460243B1 EP 04290399 A EP04290399 A EP 04290399A EP 04290399 A EP04290399 A EP 04290399A EP 1460243 B1 EP1460243 B1 EP 1460243B1
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- European Patent Office
- Prior art keywords
- pipe
- closing
- resonator
- bypass device
- waves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 230000030279 gene silencing Effects 0.000 title 1
- 230000003584 silencer Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 3
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000006872 improvement Effects 0.000 claims description 2
- 238000009795 derivation Methods 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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
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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
- F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
Definitions
- the invention relates to an acoustic attenuation system for a tube used for the flow of gas and more particularly for an exhaust pipe of an internal combustion engine, see DE 20003519 U1.
- Car manufacturers tend to improve the acoustic qualities of their vehicles.
- noise include the noise emitted by the engine at the corrector of the exhaust duct.
- the exhaust line cooperates with the engine and drives most of the acoustic waves of the latter. These waves cause the output of the muffler loud noise harmful to the hearing of people in the vehicle.
- a "resonator" It is also known to mount, parallel to said exhaust duct and upstream of said silencer, a "resonator". It generally comprises a tube which connects said conduit to a closed cavity which allows the reflection of the waves to further attenuate them.
- a "resonator” is very effective only for a small frequency range (the range being optimized by the choice of dimensions of said resonator) and may outside this range change the structure of the noise over the rest of the frequency range .
- the object of the present invention is to overcome all or part of the disadvantages mentioned above by proposing an acoustic attenuation system which, according to the frequency of the waves present in the exhaust duct, changes configuration to generally improve the attenuation on a wide frequency range.
- the invention relates to an acoustic attenuation system, in particular for an internal combustion engine exhaust duct, comprising a means of the silent type mounted in series on said duct, at least one means of the resonator type connected in parallel.
- the shunt device comprises, according to the invention, a second tube connecting said closed cavity for each of said resonator-type means and said duct, a first means for closing one of said tubes and a second means for closing said duct between openings of said two tubes for selectively closing said conduit to force the deflection of its flow to one of said tubes.
- the two closure means are, advantageously, valves of the electromagnetic type.
- Each tube, containing said closure means advantageously comprises according to the invention, at its end contained in said cavity holes to allow the improvement of sound absorption.
- said attenuation system further includes means for detecting the speed of said motor, making it possible to deduce the frequency of the waves in said exhaust duct in order to control the actuation of said device. bypass.
- the acoustic attenuation system 1 comprises a duct 2 which may, for example, be an exhaust line of an internal combustion engine, a means of the silent type 3 such explained above and an acoustic assembly 4.
- said acoustic assembly comprises a first tube 5 and a second tube 6 which both communicate with the conduit 2 by the holes 7 and 8 respectively on the surface of the latter.
- these tubes 5 and 6 may, for example, be welded directly to the duct 2.
- the tubes 5 and 6 also communicate with a closed cavity 9.
- a portion 10 and 11 of each of the tubes 5 and 6 penetrate inside the cavity 9. to be able to add, as in the example of Figure 2, a perforated section 12 in extension of the end 11 of one of the tubes 6 so as to better absorb the acoustic waves present in the cavity 9.
- the dimensions of the cavity 9, the duct 2, the silent means 3 and the tubes 5 and 6 are chosen as a function of the location of implantation but especially as a function of the waves transmitted in the duct 2.
- the efficiency the attenuation shown in the example of FIGS. 3a and 4a is directly dependent on the dimensions of the elements of the acoustic attenuation system 1.
- the tube 6 and the conduit 2 each comprise a closure means respectively 13 and 14.
- these means allow controlled obstruction of the conduit 2 and / or the tube 6.
- the closing means 13 and 14 are electromagnetic valves capable of being controlled by one or more computers (not shown ).
- the closure means 14 is placed in the conduit 2 between the two holes 7 and 8 so that when it obstructs the conduit 2, the flow A flowing in the latter is forced to continue its course towards the tube 5.
- the tube 5-cavity assembly 9 forms a means of the resonator type as explained above. Therefore a bypass system 15, having the closure means 13 and 14 and the tube 6, makes it possible to operate the acoustic assembly 4 either as a means of the silent type or as a means of the resonator type. Thus according to the frequency of the main acoustic waves in the conduit 2, the closing means 13 and 14 are activated to change configuration.
- the closure means 13 is closed and the closure means 14 is open.
- the acoustic assembly 4 is therefore in its configuration of the resonator type.
- Curve 3b represents the transmission loss at the outlet of the duct relative to the incoming one as a function of the transmission frequency waves. It is clearly seen that for frequencies up to 400 Hertz the attenuation is substantially between 40 and 50 dB and above 400 Hertz substantially stabilized at 30 dB.
- the closure means 13 is open and the 14 is closed.
- the acoustic assembly 4 is therefore in its configuration of the silent type.
- the curve 4b represents the transmission loss at the output of the duct 2 with respect to that coming as a function of the frequency of emission of the waves. It can be seen that for frequencies up to about 700 Hertz the attenuation is substantially around 30 dB and reaches above 700 Hertz at least substantially 40 dB.
- the threshold frequency of the main waves to be taken into account to switch from one configuration to another appears to be substantially 700 Hertz.
- the acoustic assembly 4 in its resonator mode as shown in FIG. 3a and for the other frequencies (in the example in FIG. above 700 Hertz), in its silent mode as shown in Figure 4a.
- a better acoustic attenuation system 1 is obtained over a wide frequency range by controlling the deflection device 15 as a function of the threshold frequency, which itself is a function of the overall geometry of the duct 2.
- the frequency of the waves present in the duct 2 can be compared with the threshold frequency by a computer via a sensor, but for example if the duct 2 is an exhaust line of an internal combustion engine, the frequency of the waves present in the duct 2 can be estimated from the regime of said motor which is substantially proportional.
- the present invention is not limited to the illustrated example but is susceptible of various variations and modifications that will occur to those skilled in the art.
- the section of the conduit 2 is not limited in form.
- the perforated section 12 may for example be replaced by a bent or U-shaped tube having holes and connecting the end 11 of the tube 6 to the end 10 of the tube 5 inside the cavity 9. This can make it possible to form a one-piece assembly 5, 12, 6 which would be a non-rectilinear tube having holes at the portion included in the cavity 9.
- the closing means 13 and 14 can also be means of pneumatic, electromechanical or mechanical type.
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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)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
L'invention se rapporte à un système d'atténuation acoustique pour un tube servant à l'écoulement de gaz et plus particulièrement pour un conduit d'échappement de moteur à combustion interne, voir DE 20003519 U1.The invention relates to an acoustic attenuation system for a tube used for the flow of gas and more particularly for an exhaust pipe of an internal combustion engine, see DE 20003519 U1.
Les constructeurs automobiles tendent à améliorer les qualités acoustiques de leurs véhicules. Ainsi parmi les nuisances sonores les plus importantes, figurent les bruits émis par le moteur au niveau du correcteur du conduit d'échappement. En effet, la ligne d'échappement coopère avec le moteur et conduit la plupart des ondes acoustiques de ce dernier. Ces ondes provoquent en sortie du pot d'échappement un bruit de forte intensité nuisible pour l'ouie des personnes présentes dans le véhicule.Car manufacturers tend to improve the acoustic qualities of their vehicles. Thus among the most important noise, include the noise emitted by the engine at the corrector of the exhaust duct. Indeed, the exhaust line cooperates with the engine and drives most of the acoustic waves of the latter. These waves cause the output of the muffler loud noise harmful to the hearing of people in the vehicle.
Il est connu de monter en série sur le conduit d'échappement un « silencieux » pour absorber une partie de ces ondes. Il est en général constitué d'un tube de grand diamètre par rapport au conduit d'échappement et recouvre partiellement ce dernier. L'intérieur est vide et communique avec ledit conduit par des perçages réalisés dessus ou est composé de chicanes. Ces deux structures internes ont pour but de réfléchir et d'absorber les ondes acoustiques. Cependant, un silencieux à lui seul n'atténue pas suffisamment les ondes générées par le moteur.It is known to mount in series on the exhaust duct a "silent" to absorb some of these waves. It generally consists of a large diameter tube relative to the exhaust duct and partially covers the latter. The interior is empty and communicates with said duct by holes made on it or is composed of baffles. These two internal structures aim to reflect and absorb acoustic waves. However, a silencer alone does not sufficiently attenuate the waves generated by the engine.
Il est également connu de monter, en parallèle dudit conduit d'échappement et en amont dudit silencieux, un « résonateur ». Il comporte généralement un tube qui relie ledit conduit à une cavité fermée qui permet la réflexion des ondes pour encore les atténuer. Cependant, un « résonateur » est très efficace seulement pour une faible plage de fréquences (la plage étant optimisée par le choix des dimensions dudit résonateur) et peut en dehors de cette plage modifier la structure du bruit sur le reste de la plage de la fréquence.It is also known to mount, parallel to said exhaust duct and upstream of said silencer, a "resonator". It generally comprises a tube which connects said conduit to a closed cavity which allows the reflection of the waves to further attenuate them. However, a "resonator" is very effective only for a small frequency range (the range being optimized by the choice of dimensions of said resonator) and may outside this range change the structure of the noise over the rest of the frequency range .
Le but de la présente invention est de pallier tout ou partie les inconvénients cités précédemment en proposant un système d'atténuation acoustique qui, suivant la fréquence des ondes présentes dans le conduit d'échappement, change de configuration pour globalement améliorer l'atténuation sur une large plage de fréquences.The object of the present invention is to overcome all or part of the disadvantages mentioned above by proposing an acoustic attenuation system which, according to the frequency of the waves present in the exhaust duct, changes configuration to generally improve the attenuation on a wide frequency range.
A cet effet, l'invention se rapporte à un système d'atténuation acoustique notamment pour conduit d'échappement de moteur à combustion interne comportant un moyen du type silencieux monté en série sur ledit conduit, au moins un moyen du type résonateur monté en parallèle dudit conduit et constitué d'un tube qui, communicant avec ledit conduit, relie ce dernier à une cavité fermée caractérisé en ce qu'il comporte de plus un dispositif de dérivation accouplé à chaque moyen du type résonateur qui permet, suivant une fréquence seuil des ondes acoustiques présentes dans ledit conduit, de sélectivement dévier le flux dudit conduit pour transformer ledit moyen du type résonateur en un moyen du type silencieux.For this purpose, the invention relates to an acoustic attenuation system, in particular for an internal combustion engine exhaust duct, comprising a means of the silent type mounted in series on said duct, at least one means of the resonator type connected in parallel. said duct and consisting of a tube which, communicating with said duct, connects it to a closed cavity characterized in that it further comprises a shunt device coupled to each resonator type means which allows, at a threshold frequency of acoustic waves present in said conduit, selectively diverting the flow of said conduit to convert said resonator means to a silent type means.
Le dispositif de dérivation comporte, selon l'invention, un deuxième tube reliant ladite cavité fermée pour chacun desdits moyens du type résonateur et ledit conduit, un premier moyen de fermeture d'un desdits tubes et un deuxième moyen de fermeture dudit conduit compris entre les ouvertures desdits deux tubes permettant de sélectivement obturer ledit conduit pour forcer la déviation de son flux vers un desdits tubes.The shunt device comprises, according to the invention, a second tube connecting said closed cavity for each of said resonator-type means and said duct, a first means for closing one of said tubes and a second means for closing said duct between openings of said two tubes for selectively closing said conduit to force the deflection of its flow to one of said tubes.
Selon l'invention, les deux moyens de fermeture sont, avantageusement, des vannes du type électromagnétique.According to the invention, the two closure means are, advantageously, valves of the electromagnetic type.
Chaque tube, contenant ledit moyen de fermeture, comporte, avantageusement selon l'invention, à son extrémité contenue dans ladite cavité des trous pour permettre l'amélioration de l'absorption acoustique.Each tube, containing said closure means, advantageously comprises according to the invention, at its end contained in said cavity holes to allow the improvement of sound absorption.
Selon une première variante de l'invention, ledit système d'atténuation comporte, de plus, des moyens de détection du régime dudit moteur permettant d'en déduire la fréquence des ondes dans ledit conduit d'échappement afin de piloter l'actionnement dudit dispositif de dérivation.According to a first variant of the invention, said attenuation system further includes means for detecting the speed of said motor, making it possible to deduce the frequency of the waves in said exhaust duct in order to control the actuation of said device. bypass.
Selon une deuxième variante de l'invention, ledit système d'atténuation comporte, de plus, des moyens de détection de la fréquence des ondes dans ledit conduit pour piloter l'actionnement dudit dispositif de dérivation.
L'invention se rapporte également à un procédé d'utilisation du dispositif de dérivation précédemment cité, caractérisé en ce qu'il comporte les étapes consistant à :
- Comparer la fréquence des ondes dans ledit conduit par rapport à ladite fréquence seuil ;
- Si elle est inférieure :
- Fermer le premier moyen de fermeture ;
- Ouvrir le deuxième moyen de fermeture afin de faire fonctionner le dispositif de dérivation en mode résonateur.
- Si elle est supérieure ou égale :
- Ouvrir le premier moyen de fermeture ;
- Fermer le deuxième moyen de fermeture afin de faire fonctionner le dispositif de dérivation en mode silencieux.
The invention also relates to a method for using the aforementioned diversion device, characterized in that it comprises the steps of:
- Comparing the frequency of the waves in said duct with respect to said threshold frequency;
- If it is lower:
- Close the first closing means;
- Open the second closure means to operate the bypass device in resonator mode.
- If it is greater than or equal to:
- Open the first means of closure;
- Close the second closure means to operate the bypass device in silent mode.
D'autres particularités et avantages ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquelles :
- la figure 1 est une vue générale schématique du système d'atténuation ;
- la figure 2 est une vue schématique du dispositif de dérivation ;
- les figures 3a et 3b sont respectivement la vue schématique dudit dispositif en mode « résonateur » et sa courbe de perte de transmission associée ;
- les figures 4a et 4b sont respectivement la vue schématique dudit dispositif en mode « silencieux » et sa courbe de perte de transmission associée.
- Figure 1 is a schematic overview of the attenuation system;
- Figure 2 is a schematic view of the bypass device;
- Figures 3a and 3b are respectively the schematic view of said device in "resonator" mode and its associated transmission loss curve;
- Figures 4a and 4b are respectively the schematic view of said device in "silent" mode and its associated transmission loss curve.
Dans l'exemple illustré à la figure 1, on peut voir que le système d'atténuation acoustique 1 comporte un conduit 2 qui peut, par exemple, être une ligne d'échappement de moteur à combustion interne, un moyen du type silencieux 3 tel qu'expliqué ci-dessus et un ensemble acoustique 4.In the example illustrated in FIG. 1, it can be seen that the acoustic attenuation system 1 comprises a
Comme illustré dans l'exemple de la figure 2, ledit ensemble acoustique comporte un premier tube 5 et un deuxième tube 6 qui tous deux communiquent avec le conduit 2 par respectivement les trous 7 et 8 pratiqués à la surface de ce dernier. Pour des raisons d'étanchéité, ces tubes 5 et 6 peuvent, par exemple, être soudés à même le conduit 2.As illustrated in the example of Figure 2, said acoustic assembly comprises a
Dans l'exemple illustré à la figure 2, les tubes 5 et 6 communiquent également avec une cavité fermée 9. Préférentiellement, une partie 10 et 11 de chacun des tubes 5 et 6 pénètre à l'intérieur de la cavité 9. Cela permet notamment de pouvoir ajouter, comme dans l'exemple de la figure 2, un tronçon troué 12 en prolongement de l'extrémité 11 d'un des tubes 6 de façon à mieux absorber les ondes acoustiques présentes dans la cavité 9.In the example illustrated in FIG. 2, the
Les dimensions de la cavité 9, du conduit 2, du moyen silencieux 3 et des tubes 5 et 6 sont choisis en fonction du lieu d'implantation mais surtout en fonction des ondes transmises dans le conduit 2. Ainsi ci-après, l'efficacité d'atténuation présentée dans l'exemple des figures 3a et 4a est directement dépendante des dimensions des éléments du système d'atténuation acoustique 1.The dimensions of the
Dans l'exemple de la figure 2, on peut voir que le tube 6 et le conduit 2 comportent chacun un moyen de fermeture respectivement 13 et 14. Ainsi, ces moyens permettent l'obstruction pilotée du conduit 2 et/ou du tube 6. Préférentiellement, les moyens de fermeture 13 et 14 sont des vannes électromagnétiques capables d'être pilotées par un ou plusieurs calculateurs (non représentés).In the example of Figure 2, it can be seen that the
Le moyen de fermeture 14 est placé dans le conduit 2 entre les deux trous 7 et 8 de manière à ce que lorsque qu'il obstrue le conduit 2, le flux A s'écoulant dans ce dernier soit contraint à continuer sa course vers le tube 5.The closure means 14 is placed in the
Comme on peut le voir, l'ensemble tube 5 - cavité 9 forme un moyen du type résonateur comme expliqué ci-dessus. Dès lors un système de dérivation 15, comportant les moyens de fermeture 13 et 14 ainsi que le tube 6, permet de faire fonctionner l'ensemble acoustique 4 soit comme un moyen du type silencieux soit comme un moyen du type résonateur. Ainsi suivant la fréquence des ondes acoustiques principales dans le conduit 2, les moyens de fermeture 13 et 14 sont activés pour changer de configuration.As can be seen, the tube 5-
A titre d'exemple, les dimensions pour les figures 3a et 4a sont :
- Conduit 2 :
- longueur = 3 m
- diamètre = 50 mm
- silencieux 3 :
- longueur = 350 mm
- diamètre = 200 mm
- ensemble acoustique 4 :
volume cavité 9 = 3 dm3diamètre tubes 5et 6 = 30 mm
- Conduit 2:
- length = 3 m
- diameter = 50 mm
- silencer 3:
- length = 350 mm
- diameter = 200 mm
- acoustic set 4:
-
cavity volume 9 = 3 dm 3 -
5 and 6 = 30 mmdiameter tubes
-
Dans l'exemple de la figure 3a, le moyen de fermeture 13 est fermé et le moyen de fermeture 14 est ouvert. L'ensemble acoustique 4 est donc dans sa configuration du type résonateur. La courbe 3b représente la perte par transmission en sortie du conduit par rapport à celui entrant en fonction de la fréquence d'émission des ondes. On voit très nettement que pour les fréquences jusqu'à 400 Hertz l'atténuation est comprise sensiblement entre 40 et 50 dB et au-dessus de 400 Hertz sensiblement stabilisée à 30 dB.In the example of Figure 3a, the closure means 13 is closed and the closure means 14 is open. The acoustic assembly 4 is therefore in its configuration of the resonator type. Curve 3b represents the transmission loss at the outlet of the duct relative to the incoming one as a function of the transmission frequency waves. It is clearly seen that for frequencies up to 400 Hertz the attenuation is substantially between 40 and 50 dB and above 400 Hertz substantially stabilized at 30 dB.
Dans l'exemple de la figure 4a, le moyen de fermeture 13 est ouvert et le 14 est fermé. L'ensemble acoustique 4 est donc dans sa configuration du type silencieux. La courbe 4b représente la perte par transmission en sortie du conduit 2 par rapport à celui entrant en fonction de la fréquence d'émission des ondes. On voit que pour les fréquences jusqu'à environ 700 Hertz l'atténuation est comprise sensiblement autour de 30 dB et atteint au-dessus de 700 Hertz au moins sensiblement 40 dB.In the example of Figure 4a, the closure means 13 is open and the 14 is closed. The acoustic assembly 4 is therefore in its configuration of the silent type. The curve 4b represents the transmission loss at the output of the
En comparant ces deux courbes 3b et 4b qui sont fonction des dimensions citées ci-dessus, on voit de façon très nette que l'ensemble acoustique 4 est pour des fréquences d'ondes :
- Inférieures à 400 Hertz, plus performant en mode résonateur ;
- entre 400 Hertz et 700 Hertz, sensiblement aussi performant en mode résonateur qu'en mode silencieux ;
- supérieures à 700 Hertz, plus performant en mode silencieux.
- Less than 400 Hertz, more efficient in resonator mode;
- between 400 Hertz and 700 Hertz, substantially as good in resonator mode as in silent mode;
- higher than 700 Hertz, more efficient in silent mode.
Ainsi dans l'exemple des figures 3a et 3b, la fréquence seuil des ondes principales à prendre en compte pour passer d'une configuration à l'autre paraît être sensiblement 700 Hertz. Ainsi pour les basses fréquences (dans l'exemple en-dessous de 700 Hertz), il est préférable d'utiliser l'ensemble acoustique 4 dans son mode résonateur comme représenté à la figure 3a et pour les autres fréquences (dans l'exemple au-dessus de 700 Hertz), dans son mode silencieux comme représenté à la figure 4a.Thus, in the example of FIGS. 3a and 3b, the threshold frequency of the main waves to be taken into account to switch from one configuration to another appears to be substantially 700 Hertz. Thus for the low frequencies (in the example below 700 Hertz), it is preferable to use the acoustic assembly 4 in its resonator mode as shown in FIG. 3a and for the other frequencies (in the example in FIG. above 700 Hertz), in its silent mode as shown in Figure 4a.
Ainsi, on obtient un système d'atténuation acoustique 1 meilleur sur une large plage de fréquence en pilotant le dispositif de déviation 15 en fonction de la fréquence seuil qui, elle-même, est fonction de la géométrie globale du conduit 2.Thus, a better acoustic attenuation system 1 is obtained over a wide frequency range by controlling the
La fréquence des ondes présentes dans le conduit 2 peut être comparée à la fréquence seuil par un calculateur via un capteur, mais par exemple si le conduit 2 est une ligne d'échappement de moteur à combustion interne, la fréquence des ondes présentes dans le conduit 2 peut être estimée à partir du régime dudit moteur qui lui est sensiblement proportionnel.The frequency of the waves present in the
Bien entendu, la présente invention ne se limite pas à l'exemple illustré mais est susceptible de diverses variantes et modifications qui apparaîtront à l'homme de l'art. En particulier, la section du conduit 2 n'est pas limitée quant à sa forme. De même, il convient bien évidemment de tester la fréquence seuil caractéristique pour une configuration différente de conduit 2 afin d'obtenir les meilleures atténuations possibles. Egalement, le tronçon troué 12 peut par exemple être remplacé par un tube coudé, ou en forme de U, comportant des trous et qui relie l'extrémité 11 du tube 6 à l'extrémité 10 du tube 5 à l'intérieur de la cavité 9. Cela peut permettre de former un ensemble monobloc 5, 12, 6 qui serait un tube non rectiligne comportant des trous au niveau de la partie comprise dans la cavité 9. Enfin, les moyens de fermeture 13 et 14 peuvent aussi être des moyens de type pneumatique, électromécanique ou mécanique.Of course, the present invention is not limited to the illustrated example but is susceptible of various variations and modifications that will occur to those skilled in the art. In particular, the section of the
Claims (6)
- Sound attenuation system (1) in particular for an exhaust pipe (2) of an internal combustion engine comprising a silencer-type means (3) mounted in series on said pipe (2), at least one means of the resonator type (4) mounted parallel to said pipe (2) and constituted by a tube (5) which, communicating with said pipe (2), connects the latter to a closed cavity (9), a bypass device (6, 13, 14) coupled with each resonator-type means which, depending on a threshold frequency of the acoustic waves present in said pipe (2), makes it possible selectively to divert the flow from said pipe in order to transform said resonator-type means into a silencer-type means, the bypass device comprises a second tube (6) connecting said closed cavity for each of said resonator-type means and said pipe (2), a first means (13) for closing one of said tubes (5, 6), characterised in that a second means (14) for closing said pipe (2) is comprised between the openings (7, 8) of said two tubes (5, 6) making it possible selectively to seal said pipe in order to force its flow to be diverted towards one of said tubes (5, 6).
- Sound attenuation system (1) according to Claim 1, characterised in that it further comprises means for detecting the frequency of the waves in said pipe to control the actuation of said bypass device.
- Sound attenuation system (1) according to Claim 1, characterised in that it further comprises means for detecting the speed of said engine making it possible to deduce therefrom the frequency of the waves in said exhaust pipe in order to control the actuation of said bypass device.
- Sound attenuation system (1) according to one of the preceding claims, characterised in that the two closing means (13, 14) are valves of the electromagnetic type.
- Sound attenuation system (1) according to one of the preceding claims, characterised in that each tube (6), containing said closing means, comprises, at its end (12) contained in said cavity, holes to allow the improvement of acoustic absorption.
- Method of using the bypass device according to one of Claims 1 to 5, characterised in that it comprises the steps consisting in:- comparing the frequency of the waves in said pipe compared with said threshold frequency:- if it is lower:- closing the first closing means (13);- opening the second closing means (14) in order to make the bypass device function in resonator mode.- if it is higher or equal:- opening the first closing means (13);- closing the second closing means (14) in order to make the bypass device function in silencer mode.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR0303397 | 2003-03-20 | ||
FR0303397A FR2852625B1 (en) | 2003-03-20 | 2003-03-20 | ACOUSTICAL ATTENUATION SYSTEM |
Publications (2)
Publication Number | Publication Date |
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EP1460243A1 EP1460243A1 (en) | 2004-09-22 |
EP1460243B1 true EP1460243B1 (en) | 2006-09-20 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP04290399A Expired - Lifetime EP1460243B1 (en) | 2003-03-20 | 2004-02-13 | Acoustic silencing system |
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Country | Link |
---|---|
EP (1) | EP1460243B1 (en) |
AT (1) | ATE340304T1 (en) |
DE (1) | DE602004002419T2 (en) |
FR (1) | FR2852625B1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9207838U1 (en) * | 1992-06-11 | 1992-09-10 | Heinrich Gillet GmbH & Co KG, 6732 Edenkoben | silencer |
JP3248381B2 (en) * | 1995-01-09 | 2002-01-21 | トヨタ自動車株式会社 | Butterfly valve |
DE20003519U1 (en) * | 2000-02-25 | 2000-06-08 | Wolff, Robert, 67487 Maikammer | Helmholtz resonator |
-
2003
- 2003-03-20 FR FR0303397A patent/FR2852625B1/en not_active Expired - Fee Related
-
2004
- 2004-02-13 DE DE602004002419T patent/DE602004002419T2/en not_active Expired - Fee Related
- 2004-02-13 AT AT04290399T patent/ATE340304T1/en not_active IP Right Cessation
- 2004-02-13 EP EP04290399A patent/EP1460243B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2852625B1 (en) | 2007-01-12 |
EP1460243A1 (en) | 2004-09-22 |
ATE340304T1 (en) | 2006-10-15 |
DE602004002419D1 (en) | 2006-11-02 |
FR2852625A1 (en) | 2004-09-24 |
DE602004002419T2 (en) | 2007-05-03 |
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