EP0077230A1 - Gas flow modulation apparatus for an exhaust silencer of an internal-combustion engine - Google Patents

Gas flow modulation apparatus for an exhaust silencer of an internal-combustion engine Download PDF

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Publication number
EP0077230A1
EP0077230A1 EP82401704A EP82401704A EP0077230A1 EP 0077230 A1 EP0077230 A1 EP 0077230A1 EP 82401704 A EP82401704 A EP 82401704A EP 82401704 A EP82401704 A EP 82401704A EP 0077230 A1 EP0077230 A1 EP 0077230A1
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EP
European Patent Office
Prior art keywords
resonator
tube
orifice
valve
silencer
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
EP82401704A
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German (de)
French (fr)
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EP0077230B1 (en
Inventor
Jean-Pierre Buchwalder
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Peugeot Cycles SA
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Peugeot Cycles SA
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Publication date
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Publication of EP0077230A1 publication Critical patent/EP0077230A1/en
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Publication of EP0077230B1 publication Critical patent/EP0077230B1/en
Expired legal-status Critical Current

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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
    • F01N1/16—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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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 the 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction

Definitions

  • the object of the present invention is to remedy these drawbacks by making it possible to modify the acoustic diagram of the silencer as a function of the engine speed.
  • This invention indeed relates to a device for modulating the gas flow inside an exhaust silencer comprising, in a closed envelope, at least two perforated tubes traversed in series by the exhaust gas and an open resonator, which comprises in the resonator an orifice provided with a valve for adjusting its passage section, which is controlled by the flow of exhaust gas, that is to say by the engine speed.
  • the valve adjusts the passage section of an orifice for placing the resonator in communication with a chamber of the silencer.
  • the flow of gas leaving the resonator and entering the muffler chamber is thus automatically modified according to the flow of exhaust gas. It is all the more important that the gas flow is important, that is to say that the engine speed is high.
  • the valve control can be obtained from various parameters of the exhaust gas flow, for example from the pressure or the temperature inside the resonator or from the speed of the silencer output flow.
  • the valve adjusts an orifice for placing the resonator in communication with an inlet or pressure tapping tube, as a function of the outlet speed of the exhaust flow.
  • the muffler shown is of the resonator type and comprises, consequently, an envelope 1 closed at each of its ends by a cup 2 and divided by a number of internal cups 3 into a number of chambers, for example chambers 4, 5 and 6 represented.
  • Several tubes 8, 9 and 10 are mounted parallel to each other in the casing 1 and communicate with each other both by their perforations and by chambers such as chamber 5 into which two of them open.
  • the chamber 6 also communicates with the chamber 5 via a pressure-taking tube 12 and thus constitutes a resonator.
  • a flexible valve 16 is fixed to the partition 3 in line with the orifice 14 and tends at all times to apply on the edge of this orifice, so to shut it off.
  • the valve 16 opens gradually. It then clears a passage whose cross section depends on the pressure inside the resonator 6.
  • the movement of the valve 16 and the variation in section of the orifice 14 modify the operation of the resonator and adapt the acoustic attenuation obtained to the flow of gas flowing, that is to say to the engine speed.
  • the slowing of the flow caused by the reduction in section of the orifice 14 or even the closing of this orifice eliminates any phenomenon of aspiration in the inlet tube 8 towards the motor and, consequently, reduces considerably the risk of fuel entering the muffler.
  • the valve for adjusting the section of the orifice 14 can be controlled by another parameter of the flow of exhaust gas.
  • the silencer may include a guided valve 18 carried by a rod 20 which passes through the orifice 14 and is integral with an expandable strip 22 sensitive to the temperature prevailing in the resonator 6.
  • the strip expansion 22 is preferably supported on the closing cup 2 of the silencer, so that during expansion it pushes the rod 20 di rection of the chamber 5 and separates the valve 18 from the orifice 14.
  • the position of the guided valve 18 relative to the partition 3 determines the area of the fluid passage section through the orifice 14 and depends on the expansion of the strip 22 which depends on the engine speed, since the variation of the gas temperature in the resonator is proportional to the variation of this regime.
  • the outlet 14 of the resonator 6 is adjusted by means of a shutter of the butterfly type 24 pivoting about an axis 25 and controlled by the flow of gas in the outlet tube 10 of the silencer.
  • the butterfly 24 is connected, by means of a link 26 articulated at its two ends, to a sliding rod 28 fixed to the membrane 30 of a manometric capsule.
  • a tube 32 of small diameter connects the manometric capsule to the outlet tube of the silencer, so that the membrane 30 is subjected to the difference between the pressures prevailing in the resonator and in the thin tube 32.
  • the gas flow s flowing through the outlet tube 10 creates a vacuum in the tube 32 which is proportional to the flow rate inside the tube 10, so that the position of the membrane 30 varies with the flow of exhaust gas inside the silencer and in particular in the outlet tube 10, that is to say with the engine speed.
  • the tube 10 comprises near its outlet end a constriction 34 constituted by a local deformation of its wall or internal boss 35 and the narrow plunger tube 32 opens into this constriction.
  • the exhaust gases exiting through the tube 10 are thus accelerated by the throttle 34, so that they create an increased vacuum in the tube 32 and facilitate try the action of the membrane 30 on the butterfly 24.
  • the outlet port 14 of the resonator has a passage section which varies with the engine speed.
  • the throttle valve 24 gradually opens this orifice under the action of the vacuum created in the tube 32, that is to say as the flow of gas flowing through the tube 10 increases.
  • the butterfly valve 24 tends to close the orifice 14.
  • the orifice 14 can be an orifice for communicating the chamber of the resonator 6 with the chamber 5, but it can also, according to an alternative embodiment shown in FIG. 3, allow the chamber of the resonator 6 with an intermediate chamber 36, a tube 38 preferably being mounted in the orifice 14 and opening into the chamber 36 which communicates with the chamber 5 through an orifice 40 and thus constitutes a second open resonator.
  • the flow modulation device modifies the acoustic attenuation characteristics of the muffler as a function of the engine speed.
  • An orifice 42 is then preferably provided in the pressure take-off tube 12 of the resonator-6 inside the latter.
  • a flap 44 pivoting on an axis 45 can move in front of the tube 12 and more or less completely close the orifice 42 under the action of a pressure capsule 46 to the membrane 48 of which it is connected by a sliding rod 50.
  • the membrane 48 is subjected to the vacuum prevailing in a narrow tube 52 which opens into the exhaust gas outlet tube 10, in line with a throttle 54.
  • the throttle 54 is preferably produced by a local deformation 55 of the wall of the tube 10.
  • this constriction 54 causes an acceleration of the output flow of the silencer and, consequently, increases the vacuum in the tube 52 and the deformation of the membrane 48.
  • the flap 44 gradually releases the orifice 42 as the speed of the gases in the tube 10 increases and, on the contrary, gradually closes this orifice when this speed decreases, that is to say that the engine speed is reduced.
  • the opening of the orifice 42 has the same effect as a shortening of the length of the pressure tapping tube 12 of the resonator and, consequently, modifies the frequency of the gas inside this resonator and allows the silencer to '' be constantly adapted to the engine speed.

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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)

Abstract

Le silencieux comporte un résonateur (6) qui communique, par un orifice (14) de sortie, avec une chambre 5. Un clapet souple (16) règle la section de passage de cet orifice, c'est-à-dire le débit de gaz de sortie du résonateur sous l'action, par exemple, de la pression régnant dans ce dernier. Lors d'une baisse de régime, le clapet réduit la section de l'orifice (14), ce qui modifie l'atténuation acoustique dans le résonateur. Le clapet peut être commandé par d'autres paramètres de l'écoulement de gaz d'échappement à l'intérieur du silencieux.The silencer comprises a resonator (6) which communicates, through an outlet orifice (14), with a chamber 5. A flexible valve (16) regulates the passage section of this orifice, that is to say the flow of exit gas from the resonator under the action, for example, of the pressure prevailing in the latter. During a drop in speed, the valve reduces the section of the orifice (14), which modifies the acoustic attenuation in the resonator. The valve can be controlled by other parameters of the exhaust gas flow inside the muffler.

Description

La réduction des bruits émis par les moteurs thermiques à combustion interne exige des systèmes, et notamment des silencieux d'échappement, de plus en plus performants. C'est ainsi que s'est généralisé l'emploi de silencieux incorporant des résonateurs ouverts ou non. Ces silencieux permettent en effet d'obtenir de bons résultats dans l'ensemble, mais restent insuffisants dans de nombreuses circonstances, leur efficacité variant avec le régime du moteur.Reducing the noise emitted by internal combustion engines requires increasingly efficient systems, and in particular exhaust silencers. This is how the use of silencers, incorporating open or unopened resonators, became widespread. These silencers indeed allow to obtain good results on the whole, but remain insufficient in many circumstances, their efficiency varying with the engine speed.

La présente invention a pour but de remédier à ces inconvénients en permettant de modifier le schéma acoustique du silencieux en fonction du régime du moteur.The object of the present invention is to remedy these drawbacks by making it possible to modify the acoustic diagram of the silencer as a function of the engine speed.

Cette invention a en effet pour objet un dispositif de modulation de l'écoulement des gaz à l'intérieur d'un silencieux d'échappement comprenant, dans une enveloppe fermée, au moins deux tubes perforés parcourus en série par le gaz d'échappement et un résonateur ouvert, qui comporte dans le résonateur un orifice muni d'un clapet de réglage de sa section de passage, qui est commandé par le flux de gaz d'échappement c'est-à-dire par le régime du moteur.This invention indeed relates to a device for modulating the gas flow inside an exhaust silencer comprising, in a closed envelope, at least two perforated tubes traversed in series by the exhaust gas and an open resonator, which comprises in the resonator an orifice provided with a valve for adjusting its passage section, which is controlled by the flow of exhaust gas, that is to say by the engine speed.

Selon un mode de réalisation préféré, le clapet règle la section de passage d'un orifice de mise en communication du résonateur avec une chambre du silencieux.According to a preferred embodiment, the valve adjusts the passage section of an orifice for placing the resonator in communication with a chamber of the silencer.

Le débit de gaz sortant du résonateur et pénétrant dans la chambre du silencieux est ainsi modifié automatiquement en fonction du flux de gaz d'échappement. Il est d'autant plus important que le flux de gaz est important, c'est-à-dire que le régime du moteur est élevé.The flow of gas leaving the resonator and entering the muffler chamber is thus automatically modified according to the flow of exhaust gas. It is all the more important that the gas flow is important, that is to say that the engine speed is high.

La commande du clapet peut être obtenue à partir de divers paramètres du flux de gaz d'échappement, par exemple à partir de la pression ou de la température à l'intérieur du résonateur ou à partir de la vitesse du flux de sortie du silencieux.The valve control can be obtained from various parameters of the exhaust gas flow, for example from the pressure or the temperature inside the resonator or from the speed of the silencer output flow.

Selon une variante de réalisation, le clapet règle un orifice de mise en communication du résonateur avec un tube d'entrée ou de prise de pression, en fonction de la vitesse de sortie du flux d'échappement.According to an alternative embodiment, the valve adjusts an orifice for placing the resonator in communication with an inlet or pressure tapping tube, as a function of the outlet speed of the exhaust flow.

La description ci-dessous de modes de réalisation donnés à titre d'exemples non limitatifs, et représentés aux dessins annexés, fera d'ailleurs ressortir les avantages et caractéristiques de l'invention.The description below of embodiments given by way of nonlimiting examples, and represented in the appended drawings, will moreover highlight the advantages and characteristics of the invention.

Sur ces dessins :

  • - la fig. 1 est une vue schématique partielle, en coupe longitudinale, d'un silencieux muni d'un dispositif selon l'invention;
  • - les fig. 2, 3 et 4 sont des vues analogues de silencieux comportant des dispositifs de modulation selon d'autres modes de réalisation.
In these drawings:
  • - fig. 1 is a partial schematic view, in longitudinal section, of a silencer provided with a device according to the invention;
  • - figs. 2, 3 and 4 are similar views of mufflers comprising modulation devices according to other embodiments.

Le silencieux représenté est du type à résonateur et comporté, par suite, une enveloppe 1 fermée à chacune de ses extrémités par une coupelle 2 et divisée par un certain nombre de coupelles intérieures 3 en un certain nombre de chambres, par exemple les chambres 4, 5 et 6 représentées. Plusieurs tubes 8, 9 et 10 sont montés parallèlement les uns aux autres dans l'enveloppe 1 et communiquent entre eux à la fois par leurs perforations et par des chambres telles que la chambre 5 dans laquelle deux d'entre eux débouchent.The muffler shown is of the resonator type and comprises, consequently, an envelope 1 closed at each of its ends by a cup 2 and divided by a number of internal cups 3 into a number of chambers, for example chambers 4, 5 and 6 represented. Several tubes 8, 9 and 10 are mounted parallel to each other in the casing 1 and communicate with each other both by their perforations and by chambers such as chamber 5 into which two of them open.

La chambre 6 communique elle aussi avec la chambre 5 par l'intermédiaire d'un tube 12-de prise de pression et constitue ainsi un résonateur. Un orifice 14, percé dans la cloison 3 qui sépare les chambres 6 et 5, constitue une sortie pour ce résonateur.The chamber 6 also communicates with the chamber 5 via a pressure-taking tube 12 and thus constitutes a resonator. An orifice 14, drilled in the partition 3 which separates the chambers 6 and 5, constitutes an outlet for this resonator.

Selon l'invention, un clapet souple 16 est fixé sur la cloison 3 au droit de l'orifice 14 et tend à tout moment à s'appliquer sur le bord de cet orifice, de façon à l'obturer. Toutefois, lorsque la pression à l'intérieur de la chambre 6 s'accroît suffisamment pour dépasser celle qui règne à l'intérieur de la chambre 5, le clapet 16 s'ouvre progressivement. Il dégage alors un passage dont la section dépend de la pression à l'intérieur du résonateur 6.According to the invention, a flexible valve 16 is fixed to the partition 3 in line with the orifice 14 and tends at all times to apply on the edge of this orifice, so to shut it off. However, when the pressure inside the chamber 6 increases enough to exceed that which prevails inside the chamber 5, the valve 16 opens gradually. It then clears a passage whose cross section depends on the pressure inside the resonator 6.

Il est clair que plus le régime du moteur est élevé plus l'écoulement de gaz à l'intérieur des tubes 8, 9 et 10 a un débit important. Par suite, la pression régnant à l'intérieur du résonateur est également élevée. Par contre, dès que le régime du moteur diminue, la pression diminue également dans le résonateur, de sorte que le clapet 16 tend à se refermer.It is clear that the higher the engine speed, the greater the flow of gas inside the tubes 8, 9 and 10. As a result, the pressure prevailing inside the resonator is also high. By cons, as soon as the engine speed decreases, the pressure also decreases in the resonator, so that the valve 16 tends to close.

Bien entendu, le déplacement du clapet 16 et la variation de section de l'orifice 14 modifient le fonctionnement du résonateur et adaptent l'atténuation acoustique obtenue au flux de gaz qui circule, c'est-à-dire au régime du moteur. Par ailleurs, le ralentissement de l'écoulement provoqué par la réduction de section de l'orifice 14 ou même la fermeture de cet orifice supprime tout phénomène d'aspiration dans le tube d'entrée 8 en direction du moteur et, par suite, réduit considérablement le risque d'introduction de carburant dans le silencieux.Of course, the movement of the valve 16 and the variation in section of the orifice 14 modify the operation of the resonator and adapt the acoustic attenuation obtained to the flow of gas flowing, that is to say to the engine speed. Furthermore, the slowing of the flow caused by the reduction in section of the orifice 14 or even the closing of this orifice eliminates any phenomenon of aspiration in the inlet tube 8 towards the motor and, consequently, reduces considerably the risk of fuel entering the muffler.

Bien entendu, le clapet de réglage de la section de l'orifice 14 peut être commandé par un autre paramètre de l'écoulement de gaz d'échappement. Par exemple, comme le montre la figure 2, le silencieux peut comporter un clapet guidé 18 porté par une tige 20 qui traverse l'orifice 14 et est solidaire d'une lamelle dilatable 22 sensible à la température régnant dans le résonateur 6. La lamelle de dilatation 22 est de préférence en appui sur la coupelle de fermeture 2 du silencieux, de sorte que lors de la dilatation elle repousse la tige 20 en direction de la chambre 5 et écarte le clapet 18 de l'orifice 14.Of course, the valve for adjusting the section of the orifice 14 can be controlled by another parameter of the flow of exhaust gas. For example, as shown in FIG. 2, the silencer may include a guided valve 18 carried by a rod 20 which passes through the orifice 14 and is integral with an expandable strip 22 sensitive to the temperature prevailing in the resonator 6. The strip expansion 22 is preferably supported on the closing cup 2 of the silencer, so that during expansion it pushes the rod 20 di rection of the chamber 5 and separates the valve 18 from the orifice 14.

La position du clapet guidé 18 par rapport à la cloison 3 détermine l'aire de la section de passage du fluide à travers l'orifice 14 et dépend de la dilatation de la lamelle 22 qui dépend du régime du moteur, puisque la variation de la température du gaz dans le résonateur est proportionnelle à la variation de ce régime.The position of the guided valve 18 relative to the partition 3 determines the area of the fluid passage section through the orifice 14 and depends on the expansion of the strip 22 which depends on the engine speed, since the variation of the gas temperature in the resonator is proportional to the variation of this regime.

Selon une autre variante de réalisation représentée sur la figure 3, l'orifice 14 de sortie du résonateur 6 est réglé au moyen d'un obturateur du type papillon 24 pivotant autour d'un axe 25 et commandé par l'écoulement de gaz dans le tube de sortie 10 du silencieux. En effet, le papillon 24 est relié, par l'intermédiaire d'une biellette 26 articulée à ses .deux extrémités, à une tige coulissante 28 fixée à la membrane 30 d'une capsule manométrique. Un tube 32 de faible.diamètre relie la capsule manométrique au tube de sortie du silencieux, de sorte que la membrane 30 est soumise à la différence entre les pressions régnant dans le résonateur et dans le tube mince 32. Or, le flux de gaz s'écoulant dans le tube de sortie 10 crée dans le tube 32 une dépression qui est proportionnelle au débit à l'intérieur du tube 10, de sorte que la position de la membrane 30 varie en même temps que l'écoulement de gaz d'échappement à l'intérieur du silencieux et notamment dans le tube de sortie 10, c'est-à-dire avec le régime du moteur.According to another alternative embodiment shown in FIG. 3, the outlet 14 of the resonator 6 is adjusted by means of a shutter of the butterfly type 24 pivoting about an axis 25 and controlled by the flow of gas in the outlet tube 10 of the silencer. Indeed, the butterfly 24 is connected, by means of a link 26 articulated at its two ends, to a sliding rod 28 fixed to the membrane 30 of a manometric capsule. A tube 32 of small diameter connects the manometric capsule to the outlet tube of the silencer, so that the membrane 30 is subjected to the difference between the pressures prevailing in the resonator and in the thin tube 32. However, the gas flow s flowing through the outlet tube 10 creates a vacuum in the tube 32 which is proportional to the flow rate inside the tube 10, so that the position of the membrane 30 varies with the flow of exhaust gas inside the silencer and in particular in the outlet tube 10, that is to say with the engine speed.

De préférence, le tube 10 comporte à proximité de son extrémité de sortie un étranglement 34 constitué par une déformation locale de sa paroi ou bossage interne 35 et le tube plongeur étroit 32 débouche dans cet étranglement. Les gaz d'échappement sortant par le tube 10 sont ainsi accélérés par l'étranglement 34, de sorte qu'ils créent une dépression accrue dans le tube 32 et facilitent l'action de la membrane 30 sur le papillon 24.Preferably, the tube 10 comprises near its outlet end a constriction 34 constituted by a local deformation of its wall or internal boss 35 and the narrow plunger tube 32 opens into this constriction. The exhaust gases exiting through the tube 10 are thus accelerated by the throttle 34, so that they create an increased vacuum in the tube 32 and facilitate try the action of the membrane 30 on the butterfly 24.

Avec ce dispositif, comme avec les précédents, l'orifice 14 de sortie du résonateur a une section de passage qui varie avec le régime du moteur. Le papillon 24 ouvre en effet progressivement cet orifice sous l'action de la dépression créée dans le tube 32, c'est-à-dire au fur et à mesure de l'accroissement du débit de gaz s'écoulant par le tube 10. Au contraire, lorsque le régime du moteur diminue, la vitesse du flux de gaz dans le tube de sortie 20 décroissant, le papillon 24 tend à refermer l'orifice 14.With this device, as with the previous ones, the outlet port 14 of the resonator has a passage section which varies with the engine speed. The throttle valve 24 gradually opens this orifice under the action of the vacuum created in the tube 32, that is to say as the flow of gas flowing through the tube 10 increases. On the contrary, when the engine speed decreases, the speed of the gas flow in the outlet tube 20 decreases, the butterfly valve 24 tends to close the orifice 14.

Bien entendu l'orifice 14 peut être un orifice de mise en communication de la chambre du résonateur 6 avec la chambre 5, mais il peut également, selon une variante de réalisation représentée sur la figure 3, permettre la mise en communication de la chambre du résonateur 6 avec une chambre intermédiaire 36, un tube 38 étant de préférence monté dans l'orifice 14 et débouchant dans la chambre 36 qui communique avec la chambre 5 par un orifice 40 et constitue ainsi un second résonateur ouvert.Of course, the orifice 14 can be an orifice for communicating the chamber of the resonator 6 with the chamber 5, but it can also, according to an alternative embodiment shown in FIG. 3, allow the chamber of the resonator 6 with an intermediate chamber 36, a tube 38 preferably being mounted in the orifice 14 and opening into the chamber 36 which communicates with the chamber 5 through an orifice 40 and thus constitutes a second open resonator.

Comme dans les modes de réalisation précédents, le dispositif de modulation de l'écoulement modifie les caractéristiques d'atténuation acoustique du silencieux en fonction du régime du moteur.As in the previous embodiments, the flow modulation device modifies the acoustic attenuation characteristics of the muffler as a function of the engine speed.

Dans certains cas toutefois il peut être préférable de modifier l'écoulement des gaz à l'entrée du résonateur et non à sa sortie. Un orifice 42 est alors de préférence prévu dans le tube 12 de prise de pression du résonateur-6 à l'intérieur de ce dernier. Un volet 44 pivotant sur un axe 45 peut se déplacer devant le tube 12 et fermer plus ou moins complètement l'orifice 42 sous l'action d'une capsule manométrique 46 à la membrane 48 de laquelle il est relié par une tige coulissante 50. La membrane 48 est soumise à la dépression régnant dans un tube étroit 52 qui débouche dans le tube 10 de sortie des gaz d'échappement, au droit d'un étranglement 54. Comme dans le mode de réalisation précédent, l'étranglement 54 est de préférence réalisé par une déformation locale 55 de la paroi du tube 10. Quel que soit son mode de réalisation, cet étranglement 54 provoque une accélération du flux de sortie du silencieux et, par suite, accroît la dépression dans le tube 52 et la déformation de la membrane 48. Sous l'effet de cette déformation, le volet 44 dégage progressivement l'orifice 42 au fur et à mesure de l'accroissement de la vitesse des gaz dans le tube 10 et, au contraire, ferme progressivement cet orifice lorsque cette vitesse décroît, c'est-à-dire que le régime du moteur se réduit.In some cases, however, it may be preferable to modify the gas flow at the inlet of the resonator and not at its outlet. An orifice 42 is then preferably provided in the pressure take-off tube 12 of the resonator-6 inside the latter. A flap 44 pivoting on an axis 45 can move in front of the tube 12 and more or less completely close the orifice 42 under the action of a pressure capsule 46 to the membrane 48 of which it is connected by a sliding rod 50. The membrane 48 is subjected to the vacuum prevailing in a narrow tube 52 which opens into the exhaust gas outlet tube 10, in line with a throttle 54. As in the previous embodiment, the throttle 54 is preferably produced by a local deformation 55 of the wall of the tube 10. Whatever its embodiment, this constriction 54 causes an acceleration of the output flow of the silencer and, consequently, increases the vacuum in the tube 52 and the deformation of the membrane 48. Under the effect of this deformation , the flap 44 gradually releases the orifice 42 as the speed of the gases in the tube 10 increases and, on the contrary, gradually closes this orifice when this speed decreases, that is to say that the engine speed is reduced.

L'ouverture de l'orifice 42 a le même effet qu'un raccourcissement de la longueur du tube de prise de pression 12 du résonateur et, par suite, modifie la fréquence du gaz à l'intérieur de ce résonateur et permet au silencieux d'être à chaque instant adapté au régime du moteur.The opening of the orifice 42 has the same effect as a shortening of the length of the pressure tapping tube 12 of the resonator and, consequently, modifies the frequency of the gas inside this resonator and allows the silencer to '' be constantly adapted to the engine speed.

Claims (8)

1. Dispositif de modulation de l'écoulement des gaz dans un silencieux d'échappement de moteur à combustion interne comprenant à l'intérieur d'une enveloppe fermée au moins deux tubes perforés parcourus en série par le gaz d'échappement et un résonateur ouvert, caractérisé en ce qu'il comporte dans le résonateur (6) un orifice (14, 42) muni d'un clapet (16, 18, 24, 44) de réglage de sa section de passage,qui est commandé par le flux de gaz d'échappement variant avec le régime du moteur.1. Device for modulating the flow of gases in an exhaust silencer of an internal combustion engine comprising, inside a closed envelope, at least two perforated tubes traversed in series by the exhaust gas and an open resonator , characterized in that it comprises in the resonator (6) an orifice (14, 42) provided with a valve (16, 18, 24, 44) for adjusting its passage section, which is controlled by the flow of exhaust gases varying with engine speed. 2. Dispositif suivant la revendication 1, caractérisé en ce qu'il comporte un clapet de réglage d'un orifice de mise en communication du résonateur (6) avec une chambre (5, 36) du silencieux.2. Device according to claim 1, characterized in that it comprises a valve for adjusting an orifice for placing the resonator (6) in communication with a chamber (5, 36) of the silencer. 3. Dispositif suivant l'une des revendications 1 et 2, caractérisé en ce qu'il comporte un clapet souple déformé et écarté de l'orifice par la pression interne du résonateur (6).3. Device according to one of claims 1 and 2, characterized in that it comprises a flexible valve deformed and spaced from the orifice by the internal pressure of the resonator (6). 4. Dispositif suivant l'une des revendications 1 et 2, caractérisé en ce qu'il comporte un clapet guidé (18) solidaire d'une lamelle (22)dilatable sous l'action de la chaleur et montée à l'intérieur du résonateur (6).4. Device according to one of claims 1 and 2, characterized in that it comprises a guided valve (18) integral with a strip (22) expandable under the action of heat and mounted inside the resonator (6). 5. Dispositif suivant l'une des revendications 1 et 2, caractérisé en ce qu'il comporte un clapet pivotant (24, 44) relié à la membrane d'une capsule manométrique (30, 46) communiquant par un tube mince à dépression (32, 52) avec le tube (10) de sortie du silencieux.5. Device according to one of claims 1 and 2, characterized in that it comprises a pivoting valve (24, 44) connected to the membrane of a manometric capsule (30, 46) communicating by a thin vacuum tube ( 32, 52) with the silencer outlet tube (10). 6. Dispositif suivant la revendication 5, caractérisé en ce que le tube mince à dépression débouche dans un étranglement (34, 54) du tube (10) de sortie du silencieux.6. Device according to claim 5, characterized in that the thin vacuum tube opens into a throttle (34, 54) of the tube (10) of the silencer outlet. 7. Dispositif suivant l'une des revendications 5 et 6, caractérisé en ce quele volet pivotant est monté à l'entrée d'un tube (28) reliant le résonateur (6) à une chambre (36) du silencieux.7. Device according to one of claims 5 and 6, characterized in that the pivoting flap is mounted at the inlet of a tube (28) connecting the resonator (6) to a chamber (36) of the silencer. 8. Dispositif suivant l'une des revendications 5 et 6, caractérisé en ce que le volet pivotant (44) est monté sur le tube (12) de prise de pression du résonateur (6) et se déplace devant un orifice (42) de ce tube.8. Device according to one of claims 5 and 6, characterized in that the pivoting flap (44) is mounted on the tube (12) of the resonator pressure tap (6) and moves in front of an orifice (42) of this tube.
EP82401704A 1981-10-14 1982-09-20 Gas flow modulation apparatus for an exhaust silencer of an internal-combustion engine Expired EP0077230B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8119304A FR2514412A1 (en) 1981-10-14 1981-10-14 DEVICE FOR MODULATING THE FLOW OF GASES IN AN EXHAUST MUFFLER OF AN INTERNAL COMBUSTION ENGINE
FR8119304 1981-10-14

Publications (2)

Publication Number Publication Date
EP0077230A1 true EP0077230A1 (en) 1983-04-20
EP0077230B1 EP0077230B1 (en) 1985-01-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401704A Expired EP0077230B1 (en) 1981-10-14 1982-09-20 Gas flow modulation apparatus for an exhaust silencer of an internal-combustion engine

Country Status (6)

Country Link
US (1) US4484659A (en)
EP (1) EP0077230B1 (en)
JP (1) JPS58126414A (en)
DE (1) DE3261850D1 (en)
ES (1) ES516782A0 (en)
FR (1) FR2514412A1 (en)

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EP0119634A3 (en) * 1983-03-22 1985-05-22 Nippondenso Co., Ltd. Resonator for internal combustion engines
EP0111336A3 (en) * 1982-12-09 1985-05-29 Nippondenso Co., Ltd. Resonator for internal combustion engines
DE3736573A1 (en) * 1986-11-21 1988-06-01 Nihon Radiator Co MUFFLER FOR MOTOR VEHICLES
EP0328056A3 (en) * 1988-02-08 1990-02-28 Sango Co., Ltd. Muffler
FR2649756A1 (en) * 1989-07-12 1991-01-18 Peugeot Improved exhaust device for an engine equipped with a turbo compressor, particularly for a motor vehicle
AT399022B (en) * 1985-04-15 1995-03-27 Bombardier Rotax Gmbh TWO-STROKE INTERNAL COMBUSTION ENGINE
FR2737537A1 (en) * 1995-07-31 1997-02-07 Ecia Equip Composants Ind Auto Exhaust gas flow control valve for IC-engine - comprises obturator displaceable in front of silencer inlet between open and closed positions by manometric activator located in silencer
KR101135410B1 (en) * 2007-10-10 2012-04-17 퀄컴 인코포레이티드 Dual band radio frequency transmitter

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DE3419442A1 (en) * 1983-05-25 1984-12-20 Kogata Gasu Reibo-gijutsu Kenkyu Kumiai, Tokio/Tokyo HEAT EXCHANGER
SE447290B (en) * 1985-03-19 1986-11-03 Volvo Ab DEVICE NOISE MEASURING MEASUREMENT THROUGH A GAS STAINLESS STEEL VALVE CONTROL VALVE
US4866933A (en) * 1988-09-21 1989-09-19 Whau Chih Kao Exhaust silencer
US5112198A (en) * 1991-02-08 1992-05-12 General Motors Corporation Refrigerant compressor having variable restriction pressure pulsation attenuator
US5248859A (en) * 1991-03-25 1993-09-28 Alexander Borla Collector/muffler/catalytic converter exhaust systems for evacuating internal combustion engine cylinders
WO1995013460A1 (en) * 1993-11-09 1995-05-18 Futaba Industrial Co., Ltd. Muffler for an internal combustion engine
US5614699A (en) * 1994-05-09 1997-03-25 Nissan Motor Co., Ltd. Automobile exhaust noise suppressor
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JP3342461B2 (en) * 2000-03-01 2002-11-11 本田技研工業株式会社 Exhaust silencer
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US6390132B1 (en) 2000-12-07 2002-05-21 Caterpillar Inc. Fluid stream pulse damper
US6732510B2 (en) 2002-02-06 2004-05-11 Arvin Technologies, Inc. Exhaust processor with variable tuning system
JP3738000B2 (en) * 2002-10-07 2006-01-25 本田技研工業株式会社 Valve unit for silencer
US6899199B2 (en) * 2002-10-24 2005-05-31 Barnes Group Inc. Flapper finger valve assembly
US6915877B2 (en) 2003-01-13 2005-07-12 Garabed Khayalian Muffler device
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US9394864B2 (en) * 2014-06-11 2016-07-19 Ford Global Technologies, Llc Multi-frequency quarter-wave resonator for an internal combustion engine vehicle
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US10302052B2 (en) 2016-11-16 2019-05-28 Ford Global Technologies, Llc Vacuum actuated multi-frequency quarter-wave resonator for an internal combustion engine
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CN116480634A (en) * 2023-03-07 2023-07-25 东莞怡和嘉业医疗科技有限公司 A noise reduction box and ventilation therapy equipment

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111336A3 (en) * 1982-12-09 1985-05-29 Nippondenso Co., Ltd. Resonator for internal combustion engines
EP0119634A3 (en) * 1983-03-22 1985-05-22 Nippondenso Co., Ltd. Resonator for internal combustion engines
AT399022B (en) * 1985-04-15 1995-03-27 Bombardier Rotax Gmbh TWO-STROKE INTERNAL COMBUSTION ENGINE
DE3736573A1 (en) * 1986-11-21 1988-06-01 Nihon Radiator Co MUFFLER FOR MOTOR VEHICLES
EP0328056A3 (en) * 1988-02-08 1990-02-28 Sango Co., Ltd. Muffler
US4971166A (en) * 1988-02-08 1990-11-20 Sango Co., Ltd. Muffler
FR2649756A1 (en) * 1989-07-12 1991-01-18 Peugeot Improved exhaust device for an engine equipped with a turbo compressor, particularly for a motor vehicle
FR2737537A1 (en) * 1995-07-31 1997-02-07 Ecia Equip Composants Ind Auto Exhaust gas flow control valve for IC-engine - comprises obturator displaceable in front of silencer inlet between open and closed positions by manometric activator located in silencer
KR101135410B1 (en) * 2007-10-10 2012-04-17 퀄컴 인코포레이티드 Dual band radio frequency transmitter

Also Published As

Publication number Publication date
ES8307037A1 (en) 1983-06-16
ES516782A0 (en) 1983-06-16
FR2514412A1 (en) 1983-04-15
JPS6323366B2 (en) 1988-05-16
DE3261850D1 (en) 1985-02-21
JPS58126414A (en) 1983-07-27
FR2514412B1 (en) 1984-01-13
US4484659A (en) 1984-11-27
EP0077230B1 (en) 1985-01-09

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