EP1460243B1 - Schalldämpfungsanlage - Google Patents

Schalldämpfungsanlage Download PDF

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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
Authority
EP
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
Application number
EP04290399A
Other languages
English (en)
French (fr)
Other versions
EP1460243A1 (de
Inventor
Arnaud Vitel
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1460243A1 publication Critical patent/EP1460243A1/de
Application granted granted Critical
Publication of EP1460243B1 publication Critical patent/EP1460243B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N1/02—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

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.

Landscapes

  • 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)

Claims (6)

  1. Schalldämpfungsanlage (1) insbesondere für die Abgasleitung (2) eines Verbrennungsmotors mit einer Schalldämpfeinrichtung (3) in Reihenschaltung an der Leitung (2), mit mindestens einer Resonatoreinrichtung (4) in Parallelschaltung zur Leitung (2), bestehend aus einem Rohr (5), das mit der Leitung (2) in Verbindung steht und diese mit einem geschlossenen Hohlraum (9) verbindet, mit einer Abzweigungsvorrichtung (6, 13, 14), die mit jeder Resonatoreinrichtung gekoppelt ist und es ermöglicht, den Fluss der Leitung selektiv nach der Grenzfrequenz der akustischen Wellen in der Leitung (2) umzuleiten, um die Resonatoreinrichtung in eine Schalldämpfeinrichtung zu verwandeln, wobei die Abzweigungsvorrichtung ein zweites Rohr (6) aufweist, das den geschlossenen Hohlraum für jede Resonatoreinrichtung mit der Leitung (2) verbindet, und mit einem ersten Mittel zum Verschließen (13) eines der Rohre (5, 6), dadurch gekennzeichnet, dass ein zweites Mittel zum Verschließen (14) der Leitung (2) zwischen den Öffnungen (7, 8) der beiden Rohre (5, 6) vorgesehen ist und es erlaubt, die Leitung selektiv zu verschließen, um die Abzweigung ihres Flusses zu einem der Rohre (5, 6) zu bewirken.
  2. Schalldämpfungsanlage (1) nach Anspruch 1, dadurch gekennzeichnet, dass sie außerdem Mittel zum Erfassen der Frequenz der Wellen in der Leitung umfasst, um die Betätigung der Abzweigungsvorrichtung zu steuern.
  3. Schalldämpfungsanlage (1) nach Anspruch 1, dadurch gekennzeichnet, dass sie darüber hinaus Mittel zum Erfassen der Drehzahl des Motors aufweist, die es ermöglichen, daraus die Frequenz der Wellen in der Abgasleitung abzuleiten, um die Betätigung der Abzweigungsvorrichtung zu steuern.
  4. Schalldämpfungsanlage (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die beiden Mittel zum Verschließen (13, 14) elektromagnetische Ventile sind.
  5. Schalldämpfungsanlage (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass jedes Rohr (6), welches das Mittel zum Verschließen enthält, an seinem im Hohlraum befindlichen Ende (12) Löcher aufweist, was die Schallabsorption verbessert.
  6. Verfahren zum Verwenden der Abzweigungsvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass es die folgenden Schritte aufweist:
    - Vergleichen der Frequenz der Wellen in der Leitung mit der Grenzfrequenz
    - wenn sie kleiner ist:
    - Schließen des ersten Mittels zum Verschließen (13)
    - Öffnen des zweiten Mittels zum Verschließen (14), um die Abzweigungsvorrichtung im Resonatormodus zu betreiben
    - wenn sie größer ist:
    - Öffnen des ersten Mittels zum Verschließen (13)
    - Schließen des zweiten Mittels zum Verschließen (14), um die Abzweigungsvorrichtung im Schalldämpfungs-Modus zu betreiben.
EP04290399A 2003-03-20 2004-02-13 Schalldämpfungsanlage Expired - Lifetime EP1460243B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0303397A FR2852625B1 (fr) 2003-03-20 2003-03-20 Systeme d'attenuation acoustique
FR0303397 2003-03-20

Publications (2)

Publication Number Publication Date
EP1460243A1 EP1460243A1 (de) 2004-09-22
EP1460243B1 true EP1460243B1 (de) 2006-09-20

Family

ID=32799698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04290399A Expired - Lifetime EP1460243B1 (de) 2003-03-20 2004-02-13 Schalldämpfungsanlage

Country Status (4)

Country Link
EP (1) EP1460243B1 (de)
AT (1) ATE340304T1 (de)
DE (1) DE602004002419T2 (de)
FR (1) FR2852625B1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9207838U1 (de) * 1992-06-11 1992-09-10 Heinrich Gillet GmbH & Co KG, 6732 Edenkoben Schalldämpfer
JP3248381B2 (ja) * 1995-01-09 2002-01-21 トヨタ自動車株式会社 バタフライ弁
DE20003519U1 (de) * 2000-02-25 2000-06-08 Wolff, Robert, 67487 Maikammer Helmholtzresonator

Also Published As

Publication number Publication date
DE602004002419D1 (de) 2006-11-02
DE602004002419T2 (de) 2007-05-03
FR2852625B1 (fr) 2007-01-12
ATE340304T1 (de) 2006-10-15
EP1460243A1 (de) 2004-09-22
FR2852625A1 (fr) 2004-09-24

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