EP0674097A1 - Silencieux actif de gaz d'échappement - Google Patents

Silencieux actif de gaz d'échappement Download PDF

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Publication number
EP0674097A1
EP0674097A1 EP95102257A EP95102257A EP0674097A1 EP 0674097 A1 EP0674097 A1 EP 0674097A1 EP 95102257 A EP95102257 A EP 95102257A EP 95102257 A EP95102257 A EP 95102257A EP 0674097 A1 EP0674097 A1 EP 0674097A1
Authority
EP
European Patent Office
Prior art keywords
muffler
chamber
opening
casing
transducer
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.)
Withdrawn
Application number
EP95102257A
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German (de)
English (en)
Inventor
Andrea Renzullo
Riccardo Mazzucchelli
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.)
ELECTRONIC SOUND ATTENUATION SpA
Original Assignee
ELECTRONIC SOUND ATTENUATION SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ELECTRONIC SOUND ATTENUATION SpA filed Critical ELECTRONIC SOUND ATTENUATION SpA
Publication of EP0674097A1 publication Critical patent/EP0674097A1/fr
Withdrawn legal-status Critical Current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
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • F01N1/065—Silencing apparatus characterised by method of silencing by using interference effect by using an active noise source, e.g. speakers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17883—General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/121—Rotating machines, e.g. engines, turbines, motors; Periodic or quasi-periodic signals in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G10K2210/12822—Exhaust pipes or mufflers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3214—Architectures, e.g. special constructional features or arrangements of features
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3227—Resonators
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3227—Resonators
    • G10K2210/32271—Active resonators

Definitions

  • the present invention relates to an active exhaust gas muffler.
  • Known active exhaust gas mufflers comprise a metal casing defining an inner chamber housing one or more loudspeakers fitted to the casing; a gas inflow pipe extending through a first lateral wall of the casing and terminating close to the loudspeaker opening; and a gas outflow pipe extending from a second lateral wall of the casing.
  • the loudspeaker is supplied by the central unit of a noise reducing electronic system, and generates an antivibration (antinoise) a(t) which is added to the vibration (noise) n(t) produced by the engine to at least partially cancel the vibration n(t) inside the chamber of the muffler.
  • the high temperature (roughly 600°C) at which the exhaust gas is fed into the muffler by the inflow pipe results in considerable heating of the muffler chamber and hence the loudspeaker.
  • an active exhaust gas muffler comprising:
  • Number 1 in Figure 1 indicates an active muffler comprising a hollow metal casing 3; and a transducer 6, more specifically a loudspeaker, housed partly inside the cavity 8 defined by casing 3.
  • Casing 3 is substantially parallelepiped, and comprises two opposite half shells 9, 10 connected to each other and presenting respective peripheral end edges 9a, 10a.
  • muffler 1 also comprises a substantially rectangular partition panel 13 extending inside cavity 8, parallel to opposite rectangular walls 16, 17 of casing 3.
  • Panel 13 thus divides cavity 8 into a first chamber 8a defined by panel 13, wall 16 and the lateral walls of casing 3; and a second chamber 8b defined by panel 13, wall 17 and the lateral walls of casing 3.
  • Panel 13 is made of material impervious to heat, e.g. fiberglass, and presents a circular, central through opening 19.
  • Wall 16 presents a central through hole 21 engaged by a peripheral portion 23 of the permanent magnet 26 of loudspeaker 6. More specifically, permanent magnet 26 is substantially cylindrical, and extends outwards from wall 16 of casing 3.
  • Loudspeaker 6 also comprises a metal cone (not shown) supported on a truncated-cone-shaped support 29 extending between peripheral portion 23 of magnet 26 and panel 13. More specifically, support 29 presents a peripheral end edge 30 contacting the peripheral edge of opening 19.
  • Muffler 1 presents a gas inflow pipe 32 extending through a first lateral wall of casing 3, and communicating with a known passive muffler 35 (shown schematically) comprising a number of pipes housed inside chamber 8b.
  • Muffler 1 also presents a gas outflow pipe 38 extending through a second lateral wall of casing 3, and to the inlet of which the gas from the outlet (not shown) of device 35 is supplied.
  • muffler 1 is connected to the exhaust system 60 of a vehicle (not shown), comprising an exhaust pipe 61 extending between the exhaust manifold 63 of an internal combustion engine 65 and muffler 1.
  • Exhaust system 60 also comprises a catalytic converter 67 located along exhaust pipe 61, upstream from muffler 1.
  • Muffler 1 is connected to an electronic noise reducing system wherein a known electronic control unit 69 is input connected to a sync sensor 70 of engine 65, and to a vibration sensor 74 (e.g. a microphone) located along pipe 61, between converter 67 and muffler 1.
  • a vibration sensor 74 e.g. a microphone
  • Control unit 69 is also supplied with a signal from a vibration sensor 77 (e.g. a microphone) fitted to the end of a cylindrical pipe 77a ( Figures 1 and 3) extending radially from outflow pipe 38 of muffler 1.
  • a vibration sensor 77 e.g. a microphone
  • Control unit 69 comprises a final power stage 78 for supplying loudspeaker 6 of muffler 1 over line 79.
  • control unit in response to the signals from sensors 70 and 74, the control unit generates a signal for driving loudspeaker 6 which produces an antivibration (antinoise) a(t) in phase opposition to the vibration (noise) n(t) produced by engine 65.
  • the antivibration a(t) generated by loudspeaker 6 travels through opening 19 into chamber 8b where it interacts with the vibration n(t) from passive muffler 35.
  • Sensor 77 supplies control unit 69 with a feedback signal proportional to the amplitude of residual vibration r(t), and on the basis of which the drive signal of loudspeaker 6 is closed-loop modified to maximize interference between antivibration a(t) and vibration n(t).
  • Muffler 1 clearly provides, therefore, for reducing the temperature of loudspeaker 6.
  • magnet 26 is subjected to and cooled dynamically by the air flowing about muffler 1 when the vehicle (not shown) is in motion, thus preventing the temperature of magnet 26 from exceeding the Curie point at which it is demagnetized.
  • Opening 19 may be closed by an elastic membrane M permeable to sound and impermeable to heat, for delaying heat transmission from chamber 8b to chamber 8a and further reducing the temperature of loudspeaker 6.
  • Elastic membrane M may be integrated with or replaced by a grill structure (not shown) fitted to casing 3, facing opening 19, and presenting a number of fins (not shown) for dissipating heat towards the outer casing.
  • Casing 3 may also present one or more openings (not shown) for permitting air intake to and so internally cooling chamber 8b.
  • Figure 4 shows a first variation 1a of the Figure 1 muffler, which comprises an elongated first casing 103, and a cylindrical elongated second casing 105 connected to and located to the side of first casing 103.
  • second casing 105 defines an inner chamber 121 in turn defined by a cylindrical tubular wall 107 coaxial with an axis 109, by a flat circular wall 112 perpendicular to axis 109, and by a truncated-cone-shaped end wall 115 connected to a cylindrical gas outflow pipe 118 extending coaxially with axis 109 and outwards of casing 105.
  • Muffler 1a also comprises a cylindrical gas inflow pipe 126 (the end portion of which is shown) extending coaxially with axis 109 through wall 112 (to which it is welded) and terminating inside chamber 121.
  • First casing 103 defines a substantially parallelepiped inner chamber 129 in turn defined by two opposite rectangular walls 132, 133, by two opposite rectangular lateral walls 135, 136, and by a front and a rear wall (not shown).
  • First and second casings 103, 105 are connected to each other by a rectangular tubular appendix 140 extending between an intermediate portion of cylindrical wall 107 and a central portion of wall 132.
  • Appendix 140 defines a rectangular conduit 142 crosswise to axis 109 and connecting chambers 121 and 129, so that chamber 129 is branch connected in relation to chamber 121 and conduit 142.
  • Conduit 142 is fitted with a sheet 157 of material (e.g. rock wool) permeable to sound vibration and for preventing (or at least delaying) heat transmission from chamber 121 to chamber 129.
  • material e.g. rock wool
  • First casing 103 houses a pair of loudspeakers 145, each comprising a cone 147 with its opening facing wall 132, and a toroidal magnet 150 supported by a short cylindrical tubular appendix 154 extending from wall 133 towards wall 132.
  • Appendixes 154 communicate externally of casing 103.
  • Loudspeakers 145 are located side by side, and define, inside chamber 129, a chamber 129a (shown by the dotted line in Figures 4 and 5) defined by cones 147, by wall 132 facing cones 147, by portions 135a, 136a of lateral walls 135, 136 adjacent to wall 132, and by portions (not shown) of the front and rear walls.
  • Chamber 129a and conduit 142 define a Helmholtz resonator, the resonance frequency of which is defined by the size of chamber 129a and by the length and opening of conduit 142.
  • Variation 1b in Figure 5 differs from the Figure 4 muffler by cylindrical wall 107 presenting a number of through cooling holes 123 enabling chamber 121 to communicate externally of casing 105.
  • Muffler 1c in Figure 6 differs from 1a in Figure 4 by presenting no wall 112, and by pipe 126 penetrating inside chamber 121 through an opening 180 and without contacting casing 105.
  • pipe 126 not being supported by casing 105, must be fitted to the underside (not shown) of the vehicle.
  • Figure 7 shows an example of mufflers 1a, 1b or 1c applied to an electronic system for actively reducing the noise produced by the engine.
  • Muffler 1a, 1b, 1c may be used to advantage in electronic systems (not described) other than the one in Figure 7, which is shown purely by way of example.
  • muffler 1a, 1b, 1c is connected to the exhaust system 160 of a vehicle (not shown), comprising an exhaust pipe 161 extending between the exhaust manifold 163 of an internal combustion engine 165 and muffler 1a, 1b, 1c.
  • Exhaust system 160 also comprises a catalytic converter 167 and a passive muffler 168 located in series along exhaust pipe 61, upstream from muffler 1a, 1b, 1c.
  • Muffler 1a, 1b, 1c is connected to an electronic noise reducing system wherein a known electronic control unit 169 is input connected to a sync sensor 170 of engine 165, and to a vibration sensor 174 (e.g. a microphone) located along pipe 161, between converter 167 and muffler 168.
  • a vibration sensor 174 e.g. a microphone
  • Control unit 169 is also supplied with a signal from a vibration sensor 177 (e.g. a microphone) in the outflow pipe 118 of muffler 1a, 1b, 1c.
  • a vibration sensor 177 e.g. a microphone
  • Control unit 169 comprises a final power stage 178 for supplying loudspeakers 145 of muffler 1a, 1b, 1c over line 179.
  • control unit 169 in response to the signals from sensors 170 and 174, control unit 169 generates a signal for driving loudspeakers 145 which produce an antivibration a(t) in phase opposition to the vibration n(t) produced by engine 165.
  • antivibration a(t) is generated in chamber 129 which acts as a resonator for a given spectrum of antivibration a(t) frequencies.
  • the antivibration a(t) produced by loudspeakers 145 is thus resonance amplified, and the antivibration a(t) generated in chamber 129 travels along conduit 142 into chamber 121 where it interacts with the vibration n(t) from pipe 126.
  • Sensor 177 supplies control unit 169 with a feedback signal proportional to the amplitude of residual vibration r(t), and on the basis of which the drive signal of loudspeakers 145 is closed-loop modified to maximize interference between antivibration a(t) and vibration n(t).
  • Mufflers 1a, 1b, 1c clearly provide, therefore, for reducing the temperature of loudspeakers 145.
  • the chamber 129 housing loudspeakers 145 in fact, is both physically and thermally separated by conduit 142 and sheet 157 from the chamber 121 into which the exhaust gas produced by engine 165 is fed directly, so that the temperature inside chamber 129 is lower than in chamber 121.
  • magnets 150 are subjected to and dynamically cooled by the air flowing about muffler 1a, 1b, 1c and into appendixes 154 when the vehicle (not shown) is in motion.
  • Holes 123 or opening 180 provide, by the Venturi effect, for drawing air into chamber 121, and so reducing the temperature inside chamber 121 and hence of the muffler as a whole.
  • Muffler 1a, 1b, 1c also provides for excellent active attenuation (loudspeakers supplied) and fairly good passive attenuation (loudspeakers not supplied) of the vibration n(t) produced by engine 165.
  • resonance amplifying antivibration a(t) provides for enhancing interference and so achieving a greater reduction in vibration n(t).
  • antivibration a(t) is no longer generated.
  • casing 103 and conduit 142 act as a Helmholtz resonator which is energized by the vibration n(t) generated by the engine.
  • Vibration n(t) therefore travels along conduit 142 into chamber 129a, and oscillates the air inside chamber 129a so that the energy of vibration n(t) is partly dissipated in the form of heat, and muffler 1a, 1b, 1c provides for fairly good passive attenuation of the vibration n(t) generated by the engine.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP95102257A 1994-02-22 1995-02-17 Silencieux actif de gaz d'échappement Withdrawn EP0674097A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT94TO000109A IT1267402B1 (it) 1994-02-22 1994-02-22 Silenziatore attivo per gas di scarico.
ITTO940109 1994-02-22

Publications (1)

Publication Number Publication Date
EP0674097A1 true EP0674097A1 (fr) 1995-09-27

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EP95102257A Withdrawn EP0674097A1 (fr) 1994-02-22 1995-02-17 Silencieux actif de gaz d'échappement

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EP (1) EP0674097A1 (fr)
IT (1) IT1267402B1 (fr)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0939393A2 (fr) * 1998-02-27 1999-09-01 Tenneco Automotive Inc. Silencieux actif modulair muni d'un orifice de sortie avec déflecteur
FR2812442A1 (fr) * 2000-07-31 2002-02-01 Ecia Equip Composants Ind Auto Dispositif d'attenuation active des ondes sonores produites par une ligne d'echappement
EP1241660A2 (fr) * 2001-03-15 2002-09-18 Siemens VDO Automotive Inc. Microphone protégé du milieu extérieur pour un système actif de suppression du bruit
DE102006010558A1 (de) * 2006-03-06 2007-09-13 J. Eberspächer GmbH & Co. KG Aktiver Schalldämpfer für eine Abgasanlage
US7293627B2 (en) 2004-08-19 2007-11-13 J. Eberspeecher Gmnh Active exhaust muffler
DE102006042224B3 (de) * 2006-09-06 2008-01-17 J. Eberspächer GmbH & Co. KG Aktiver Schalldämpfer für eine Abgasanlage
EP2108791A1 (fr) 2008-04-09 2009-10-14 J. Eberspächer GmbH & Co. KG Silencieux actif
EP2105587A3 (fr) * 2008-03-27 2009-10-21 J. Eberspächer GmbH Co. KG Installation de gaz d'échappement
DE102009031848A1 (de) * 2009-07-03 2011-01-05 J. Eberspächer GmbH & Co. KG Abgasanlage mit aktivem Schalldämpfer
EP2287451A1 (fr) * 2009-07-10 2011-02-23 J. Eberspächer GmbH & Co. KG Système d'échappement et ensemble associé de connection à un actionneur
DE102009049280A1 (de) 2009-10-13 2011-04-14 J. Eberspächer GmbH & Co. KG Aktiver Schalldämpfer
US20120097478A1 (en) * 2010-10-20 2012-04-26 J. Eberspaecher Gmbh & Co. Kg Muffler
EP2530263A1 (fr) 2011-06-01 2012-12-05 J. Eberspächer GmbH & Co. KG Système de commande active du bruit pour systèmes d'échappement et procédé de commande associé
EP2543835A1 (fr) 2011-07-05 2013-01-09 J. Eberspächer GmbH & Co. KG Système anti-son pour systèmes d'échappement et procédé pour le commander
DE102011117495A1 (de) 2011-11-02 2013-05-02 J. Eberspächer GmbH & Co. KG Überlastungsschutz für Lautsprecher in Abgasanlagen
EP2600342A2 (fr) 2011-12-02 2013-06-05 J. Eberspächer GmbH & Co. KG Conception active des bruits d'échappement
CN103174499A (zh) * 2011-12-23 2013-06-26 J·埃贝斯佩歇合资公司 排气系统
CN103266933A (zh) * 2012-02-06 2013-08-28 J·埃贝斯佩歇合资公司 有源消声器
DE102012109872A1 (de) 2012-10-16 2014-04-17 Eberspächer Exhaust Technology GmbH & Co. KG Lautsprecher mit verbesserter thermischer Belastbarkeit
US8708095B2 (en) 2011-12-23 2014-04-29 Eberspächer Exhaust Technology GmbH & Co. KG Exhaust system
DE102013011937B3 (de) * 2013-07-17 2014-10-09 Eberspächer Exhaust Technology GmbH & Co. KG Schallerzeuger für ein Antischall-System zur Beeinflussung von Abgasgeräuschen und/oder Ansauggeräuschen eines Kraftfahrzeugs
EP2797075A2 (fr) 2013-04-26 2014-10-29 Eberspächer Exhaust Technology GmbH & Co. KG Système permettant d'influencer les bruits d'échappement, les bruits du moteur et/ou les bruits d'admission
DE102013104307A1 (de) 2013-04-26 2014-10-30 Eberspächer Exhaust Technology GmbH & Co. KG System zur Beeinflussung von Abgasgeräuschen und/oder Ansauggeräuschen und/oder Motorgeräuschen
EP2801708A1 (fr) 2013-05-08 2014-11-12 Eberspächer Exhaust Technology GmbH & Co. KG Générateur acoustique d'un système antibruit agissant sur les bruits de gaz d'échappement et/ou les bruits d'admission d'un véhicule automobile
EP2818654A1 (fr) 2013-06-25 2014-12-31 Eberspächer Exhaust Technology GmbH & Co. KG Système d'influence des bruits d'échappement dans une installation de gaz d'échappement à plusieurs flux
CN104420960A (zh) * 2013-08-20 2015-03-18 现代自动车株式会社 用于防止对有源噪声控制扬声器造成热损伤的结构
EP2915967A1 (fr) 2014-03-04 2015-09-09 Eberspächer Exhaust Technology GmbH & Co. KG Conception active des bruits d'échappement
EP3165729A1 (fr) 2015-11-06 2017-05-10 Eberspächer Exhaust Technology GmbH & Co. KG Générateur acoustique à fixer sur un véhicule pour influencer les bruits provenant du véhicule
DE102017129245A1 (de) * 2017-12-08 2019-06-13 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Lufteinlassvorrichtung für eine Kühlvorrichtung eines Elektrofahrzeugs
EP3156999B1 (fr) * 2015-10-16 2022-03-23 Harman Becker Automotive Systems GmbH Contrôle du bruit d'un moteur
CN114396523A (zh) * 2022-02-24 2022-04-26 中国人民解放军海军工程大学 一种用于充液管路的消声器

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WO1991015666A1 (fr) * 1990-04-09 1991-10-17 Active Noise And Vibration Technologies, Inc. Silencieux pour automobile a une seule cavite
JPH051811A (ja) * 1991-01-23 1993-01-08 Mitsubishi Electric Corp 排煙管の騒音打消し装置
WO1993005282A1 (fr) * 1991-08-29 1993-03-18 Active Noise And Vibration Technologies Inc. Pot d'echappement
WO1993009334A1 (fr) * 1991-10-30 1993-05-13 Noise Cancellation Technologies, Inc. Silencieux presentant une configuration creant un effet venturi
JPH05257483A (ja) * 1992-03-16 1993-10-08 Nkk Corp 能動的消音装置

Patent Citations (5)

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