US20190158952A1 - Sound generating device as well as vehicle exhaust system - Google Patents
Sound generating device as well as vehicle exhaust system Download PDFInfo
- Publication number
- US20190158952A1 US20190158952A1 US16/196,316 US201816196316A US2019158952A1 US 20190158952 A1 US20190158952 A1 US 20190158952A1 US 201816196316 A US201816196316 A US 201816196316A US 2019158952 A1 US2019158952 A1 US 2019158952A1
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- US
- United States
- Prior art keywords
- sound
- generating device
- housing
- channel
- opening
- 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.)
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- 230000011514 reflex Effects 0.000 claims description 4
- 238000005192 partition Methods 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
- B60R11/0217—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for loud-speakers
-
- 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
-
- 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
-
- 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
-
- 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
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
- G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes
-
- 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
- G10K15/00—Acoustics not otherwise provided for
- G10K15/02—Synthesis of acoustic waves
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
- H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q5/00—Arrangement or adaptation of acoustic signal 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
-
- 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
- G10K2210/128—Vehicles
- G10K2210/1282—Automobiles
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Definitions
- the disclosure concerns a sound generating device for a vehicle exhaust system of a motor vehicle as well as a vehicle exhaust system with at least one sound generating device.
- Such sound generating devices are intended, in particular, to generate low-frequency noises, for instance, to attenuate engine noise. Increasing the size of sound generator or the loud speaker would be conceivable to make the generation of low frequencies with greater sound pressure possible.
- a sound generating device for a vehicle exhaust system comprises a housing, a sound generator located in the housing, in particular a loudspeaker, a housing wall comprising an opening for the sound generator, and a sound channel that extends in the housing.
- the sound generator is attached to a shoulder section of the opening such that the opening is closed by the sound generator.
- a front side and a rear side of the sound generator are assigned to different sides of the opening and the sound channel connects acoustically the rear side of the sound generator to the front side of the sound generator.
- the opening and/or the sound generator comprises or comprise a central axis and the sound channel runs at least partially around the central axis.
- Low-frequency tones and noises can be amplified through the sound channel, with a certain minimum length of sound channel being required.
- this minimum length is usually longer than the length of the housing in any of its dimensions.
- a sound channel is provided that has the necessary minimum length and nevertheless does not increase the construction space required for the sound generating device.
- the sound channel can run fully within the housing.
- the sound channel provides a path for the sound waves generated by the sound generator, said sound waves propagating along this path in an intended direction of propagation.
- the sound waves propagating though the sound channel propagate substantially perpendicular to the central axis as the sound channel mainly extends around the central axis of the sound generator or of the opening within the housing.
- the phrase “extending around the central axis of the sound generator or of the opening” means, inter alia, that the sound channel extends in a plane that is substantially parallel to the plane in which the opening is located, wherein the sound channel encloses the opening at least partially.
- the sound channel thus runs via a certain range of angles around the opening.
- the sound channel preferably extends not only in a straight line.
- the sound channel comprises rounded corners that ensure that the sound waves propagate through the sound channel mainly in the intended direction of propagation without being reflected back on the edges or corners of the sound channel.
- an “acoustic connection” is understood to mean that the airborne sound waves can travel between the connected spaces, wherein a passively vibrating membrane excited by the airborne sound waves does not interrupt the acoustic connection.
- the “acoustic connection” can also be termed “acoustic coupling”.
- the sound channel connects the rear side of the sound generator with the front side of the sound generator, in particular, exclusively within the sound generating device or the housing and not via the surrounding environment of the sound generating device or the housing.
- the term “acoustic connection” does not include, in particular, connections with sound paths that extend—also partially—into the surrounding environment of the sound generating device or the housing.
- the sound generator is attached on a side of the opening on the housing wall and does not extend, therefore, through the opening.
- the sound channel is delimited, for example, by a bottom side of the housing wall so that the sound channel is provided on the side of the housing wall facing away from the rear volume.
- the sound channel can thus extend mainly, in particular fully on the front side of the loud speaker.
- the housing is, for instance rectangular, in particular quadratic.
- the corners of the rectangle may be rounded.
- the sound channel is a bass reflex tube, thus enabling the sound pressure generated by the sound generator to be amplified at low-frequency vibrations.
- the sound channel can comprise at least a curved and/or angled section.
- the housing comprises a front volume, at which the front side of the sound generator is directed, and a rear volume, at which the rear side of the sound generator is directed, wherein a sound channel acoustically connects the rear volume with the front volume, thus effectively increasing the sound pressure.
- the sound generator may be located mainly in the rear volume.
- the sound channel extends around the front volume and/or the front volume is encompassed at least in part, in particular mostly by the sound channel in a plane.
- the front volume has a central axis, wherein the sound channel at least in part extends around the central axis of the front volume.
- the sound channel can be designed without restricting the size of the front volume.
- the housing wall can separate the front volume from the rear volume.
- the sound channel extends in a peripheral region of the housing, for instance, between a housing exterior wall and the opening.
- the housing comprises an upper part and a bottom part, wherein the bottom part has the housing wall and a trough-shaped area.
- the opening is substantially closed on the side of housing wall facing away from the rear volume by the trough-shaped area.
- the upper part can take the form of a cap that is positioned on the bottom part so that the rear volume is enclosed by the upper part and the housing wall.
- the upper part in the form of a cap can also be termed a cover.
- the interior volume may be limited by the trough-shaped area and the sound generator in the opening.
- the sound generator is provided on the bottom part, in particular on the side of the housing wall facing away from the rear volume, thus simplifying the installation further.
- the sound channel, the housing wall, and the trough-shaped area may be formed together as a single piece.
- the entire bottom part can be realized as a single piece.
- the housing may comprise an output channel for acoustically connecting the sound generator with an exhaust pipe of the vehicle exhaust system, wherein the output channel extends from the front volume, in particular, wherein the sound channel opens into the output channel.
- the housing has a bottom side, wherein the sound channel, the output channel, and/or a base of the trough-shaped area is or are substantially parallel to the bottom side, in particular wherein the sound channel, the output channel, and/or a base of the trough-shaped area extends or extend from the bottom side. It is thus possible to provide the housing as a compact assembly with a defined external contour.
- the bottom side does not have to be continuous, but rather the bottom side may be regarded as a plane that delimits the housing.
- the housing wall is arranged at an angle relative to the bottom side, thus enabling the sound emission of the sound generator to be improved.
- the output channel can extend on the side of the opening from the front volume that is furthest away from the bottom side.
- the sound channel runs around the central axis in a range of angles of at least 90°, in particular at least 180°, particularly preferably at least 270°.
- the length of the sound channel can be chosen independently of the side length of the housing.
- the sound channel may have mostly an L, C, or U form in a top view.
- a vehicle exhaust system includes at least one sound generating device according to the disclosure and at least one exhaust pipe, wherein the sound generator of the sound generating device is acoustically coupled with the exhaust pipe.
- the output channel of the sound generating device opens into the exhaust pipe.
- FIG. 1 shows schematically a vehicle exhaust system according to the disclosure with a sound generating device according to the disclosure
- FIG. 2 shows the sound generating device of the vehicle exhaust system according to the disclosure according to FIG. 1 in a perspective, partially transparent view
- FIG. 3 shows a perspective view of the bottom side of the housing of the sound generating device according to FIG. 2 .
- FIG. 4 shows a section through the bottom part according to FIG. 3 along the plane IV-IV
- FIG. 5 shows a simplified top view of the bottom part according to FIG. 3 .
- FIG. 6 shows a perspective view of a second embodiment of the sound generating device according to the disclosure.
- FIG. 7 shows a section through the bottom part of the sound generating device according to FIG. 6 .
- a motor vehicle 10 is schematically shown with a vehicle exhaust system 12 .
- the vehicle exhaust system 12 directs exhaust gas generated by the internal combustion engine 14 of the motor vehicle 10 into the surrounding environment of the motor vehicle 10 .
- the vehicle exhaust system 12 comprises at least an exhaust pipe 16 and various exhaust treatment devices 18 , for example, particulate filter, catalytic converter and/or muffler.
- various exhaust treatment devices 18 for example, particulate filter, catalytic converter and/or muffler.
- the vehicle exhaust system 12 has a sound generating device 20 .
- the sound generating device 20 comprises a housing 22 and a sound generator 24 , for example a loud speaker.
- the sound generator 24 is positioned in the housing 22 and is enclosed by the housing 22 so that it is protected from external environmental influences.
- the sound generating device 20 is acoustically connected with the exhaust pipe 16 so that the sound generated by the sound generator 24 can interact with the sound in the exhaust pipe 16 .
- the sound generating device 20 is, for instance, part of an active silencer for reducing exhaust noise.
- the sound generator 24 generates noise which is in phase opposition to the engine noise coming from the internal combustion engine 14 .
- the noise coming from the sound generator 24 then interferes with the engine noise in the exhaust pipe 16 , thus suppressing, or at least attenuating, the engine noise.
- Such a sound generating device 20 may also be used to change engine noise, by using the sound generator 24 to generate additional noise that can be added to the engine noise. For example, the noise of a sportier engine can thus be imitated.
- the housing 22 is shown in a perspective view.
- the housing 22 comprises an upper part 26 illustrated partially transparently and a bottom part 28 .
- the bottom part 28 is shown in FIGS. 3 to 5 separately.
- the upper part 26 and the bottom part 28 form the outer casing of the housing 22 , which is more or less cuboid in form in the shown embodiment and has a quadratic external contour in a horizontal section ( FIG. 5 ), i.e. a section parallel to the partition plane T of the upper part 26 and the bottom part 28 .
- the corners of the quadratic external contour may be rounded.
- outer casing or the housing 22 is entirely spherical or has another form.
- the interior of the housing 22 is limited by the outer casing, in which the sound generator 24 is provided.
- the upper part 26 and the bottom part 28 are realized as mutually corresponding counterparts, for instance as half shells.
- an adapter is provided between the upper part 26 and the bottom part 28 in order to connect the upper part 26 with the bottom part 28 .
- the upper part 26 is only realized as a cap or cover that is placed on the bottom part 28 .
- the housing 22 has an upper side O that is formed by the upper part 26 and a bottom side U that is formed by the bottom part 28 .
- the upper side O is parallel to the bottom side U.
- the upper side O is a continuous surface, whereas the bottom side U in the shown embodiment is not continuous, but can be regarded as a plane (cf. FIG. 4 )
- the partition plane T at which the upper part 26 rests on the bottom part 28 , is arranged at an angle in comparison to the upper side O and the bottom side U, i.e. that the bottom side U particularly includes an angle greater than zero with the partition plane T, as clearly evident in FIG. 3 .
- the bottom part 28 comprises a housing wall 30 with an opening 32 , a trough-shaped area 34 , a sound channel 36 and an output channel 38 .
- the bottom part 28 is preferably formed as a single piece, for instance as an injection moulded part.
- the housing wall 30 , the trough-shaped area 34 , the sound channel 36 and the output channel 38 are then formed together as a single piece.
- the housing wall 30 is provided substantially parallel to the partition plane T, as can be seen in particular in FIGS. 3 to 5 .
- the housing wall 30 is thus arranged at angle to the bottom side U.
- the opening 32 for the sound generator 24 is located centrally in the housing wall 30 and has a central axis M that is also the central axis of the sound generator 24 .
- the central axis M is perpendicular to the housing wall 30 and the partition plane T.
- a shoulder section 40 on which the sound generator 24 rests at least on the edge or through which the sound generator is attached to the bottom part 28 , is provided around the opening 32 on the housing wall 30 . As a result, the sound generator 24 closes the opening 32 .
- the front side of the sound generator 24 is assigned through the opening to the underside of the housing wall 30 or the opening 32 , i.e. the side of the housing wall 30 or the opening facing the bottom side U.
- the rear side of the sound generator 24 is assigned to the upper side of the housing wall 30 or of the opening 32 , i.e. the side of the housing wall 30 or of the opening 32 facing the upper side O of the housing 22 .
- the interior space of the housing 22 is thus divided into a front volume 42 and a rear volume 44 , which are assigned to the front side and the rear side of the sound generator 24 .
- the rear volume 44 is delimited on the one hand by the upper part 26 and on the other hand by the housing wall 30 , wherein the sound generator 24 can be located fully in the rear volume 44 .
- the front volume 42 is delimited toward the upper side by the sound generator 24 and to the other side by the bottom part 28 , more specifically the trough-shaped area 34 of the bottom part 28 .
- the trough-shaped area 34 closes the opening 32 on the bottom side of the housing wall 30 .
- the trough-shaped area 34 thus forms the front volume 42 and both also have a central axis that corresponds to central axis M of the opening 32 .
- the trough-shaped area 34 connects directly to the housing wall 30 , in particular, the housing wall 30 transitions directly on the opening 32 into the trough-shaped area 34 .
- the output channel 38 goes from the front volume 42 and extends outwardly through an exterior wall 46 of the bottom part 28 .
- the exterior wall is, for example, part of the outer casing of the housing 22 .
- the output channel 38 finally opens into the exhaust pipe 16 .
- the sound generator 24 and the front volume 42 are thus acoustically coupled with the exhaust pipe 16 .
- the output channel 38 extends on the side of the trough-shaped area 34 , at which the distance between the housing wall 30 and the bottom side U is the greatest.
- the bottom of the trough-shaped area 34 and the output channel 38 are parallel to the bottom side U and form a part of the bottom side U.
- the sound channel 36 is provided to acoustically connect the front volume 42 with a rear volume 44 .
- the sound channel 36 is among other things limited by the bottom side of the housing wall 30 so that the sound channel 36 is provided on the side of the housing wall 30 facing away from the rear volume 44 .
- the start 48 of the sound channel 36 begins offset slightly clockwise from the output channel 38 , wherein no acoustic connection exists at this point between the sound channel 36 and the output channel 38 .
- the sound channel 36 originating from the start 48 of the sound channel 36 , the sound channel 36 runs along the exterior wall 46 and around the opening 32 , the trough-shaped area 34 and the sound generator 24 , in particular in a plane that is substantially parallel to the plane in which the opening 32 is provided.
- the sound channel 36 thus runs around the central axis M until the sound channel 36 finally meets the output channel 38 again and opens into the output channel 38 there.
- the sound channel 36 can also run anticlockwise.
- the sound channel 36 thus covers a range of angles ⁇ around the central axis M that is greater than 180°, in particular greater than 270°.
- FIG. 5 which illustrates a projection of the sound channel 36 , the opening 32 and the trough-shaped area 34 , it can be discerned easily that the sound channel 36 extends fully outside the trough-shaped area 34 , the opening 32 and the sound generator 24 within the housing 22 .
- the sound channel 36 thus extends in the peripheral region of the housing 22 and comprises curved sections 50 on the rounded corners of the housing 22 , said sections preventing the sound waves from being reflected.
- the sound channel 36 provides a path for the sound waves generated by the sound generator 24 , said sound waves propagating along this path in an intended direction of propagation.
- the sound channel 36 mainly extends around the central axis M of the sound generator 24 or the opening 32 within the housing 22 , a suitably long path is created for the sound waves within the housing 22 , even though the housing is designed compactly.
- a connection opening 49 through which the sound channel 36 is connected to the rear volume 44 , is provided in the housing wall 30 in the area of the start 48 of the sound channel 36 to acoustically connect the sound channel 36 with the rear volume 44 .
- connection opening 49 is thus located slightly offset clockwise to the output channel 38 in the shown embodiment.
- the rear volume 44 is acoustically connected with the front volume 42 and the exhaust pipe 16 through the sound channel 36 that opens into the output channel 38 .
- An acoustic connection is understood to mean in this case that the airborne sound waves can travel from the rear volume 44 into the front volume 42 and the exhaust pipe 16 , wherein a passively vibrating membrane, which can be located for instance in the sound channel 36 , is not considered to be an interference for an acoustic connection, even though such a membrane does not let air pass.
- the sound channel 36 forms a bass reflex tube with a length that is considerably greater than the side length of the housing 22 .
- the housing 22 and the entire sound generating device 20 can thus be designed compactly, while still enabling low tones to be transmitted powerfully.
- the entire bottom part thus the housing wall 30 , the trough-shaped area 34 , the sound channel 36 and the output channel 38 , are formed together as a single piece, wherein the wall of the sound channel 26 forms the exterior wall 46 at the same time at least partially.
- the sound channel 36 is thus delimited by the housing wall 30 , the exterior wall 46 , the housing wall of the bottom part 28 assigned to the bottom side U as well as a partition wall that is provided between the trough-shaped area 34 and the exterior wall 46 .
- FIGS. 6 and 7 a further embodiment of the sound generating device is shown that substantially corresponds to the first embodiment. Therefore, only the differences are discussed hereinafter, wherein the same parts or parts with the same function are provided with the same reference signs.
- FIG. 6 the bottom part 28 is shown with the attached sound generator 24 , whereas in FIG. 7 , a section through the bottom part 28 is shown.
- the housing wall 30 does not fully close the bottom part 28 . From the housing wall 30 , there is however a shoulder section, on which the sound generator 24 is attached, so that the interior volume of the housing 22 is divided into the front volume 42 and the rear volume 44 .
- the rear volume 44 also extends into the bottom part 28 in the embodiment shown.
- the bottom side U is formed continuously, thus limiting the rear volume 44 on the bottom side U.
- the sound generator 36 in the second embodiment is not located on the edge or the exterior wall 46 of the housing 22 , but runs very closely around the opening 32 or the shoulder section 40 .
- the distance between the sound channel 36 and the trough-shaped area 34 is approximately the width of the shoulder section 40 .
- the sound channel 36 only extends around the central axis M in a range area a of more than 90°, however less than 180°.
- the sound channel 36 then opens laterally from the trough-shaped area 34 into the rear volume 44 .
- the sound channel 36 is delimited by the housing wall 30 , the housing wall of the bottom part 28 assigned to the bottom side U as well as two partition walls that are substantially parallel to each other.
- the partition walls are mostly radially spaced and extend around the trough-shaped area 34 .
- the sound channel 36 is delimited by the housing wall 30 and housing wall of the bottom part 28 assigned to the bottom side U.
- the sound channel 36 can be limited by at least one partition wall that is adjacent to the trough-shaped area 34 .
- the trough-shaped area 34 can border the sound channel 36 itself, namely with the side opposite the opening 32 .
- the length of the sound channel 36 and thus the length of the bass reflex tube can be changed to almost any length to enable precise acoustic tuning.
- the distance between the trough-shaped area 34 and the sound channel 36 can be changed.
- the range of angles ⁇ , along which the sound channel 36 extends, can also be adjusted so that the length of the sound channel 36 is adjusted.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Signal Processing (AREA)
- Otolaryngology (AREA)
- Multimedia (AREA)
- Audiology, Speech & Language Pathology (AREA)
- General Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Toxicology (AREA)
- Exhaust Silencers (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
Description
- This application claims priority to DE 10 2017 127 454.5, filed 21 Nov. 2017.
- The disclosure concerns a sound generating device for a vehicle exhaust system of a motor vehicle as well as a vehicle exhaust system with at least one sound generating device.
- In the case of modern motor vehicles, the provision of sound generating devices in vehicle exhaust systems is known to be capable of influencing the engine noise of the internal combustion engine of a vehicle.
- Such sound generating devices are intended, in particular, to generate low-frequency noises, for instance, to attenuate engine noise. Increasing the size of sound generator or the loud speaker would be conceivable to make the generation of low frequencies with greater sound pressure possible.
- However, the construction space in a vehicle is limited so that the sound generating device has to be designed as compactly as possible. Increasing the size of loudspeaker is therefore not an option.
- Thus, there is a need to provide a sound generating device as well as a vehicle exhaust system that are not only built compactly and require little construction space, but are also capable of generating low-frequency vibrations and tones with a high sound pressure.
- A sound generating device for a vehicle exhaust system comprises a housing, a sound generator located in the housing, in particular a loudspeaker, a housing wall comprising an opening for the sound generator, and a sound channel that extends in the housing. The sound generator is attached to a shoulder section of the opening such that the opening is closed by the sound generator. A front side and a rear side of the sound generator are assigned to different sides of the opening and the sound channel connects acoustically the rear side of the sound generator to the front side of the sound generator. The opening and/or the sound generator comprises or comprise a central axis and the sound channel runs at least partially around the central axis.
- Low-frequency tones and noises can be amplified through the sound channel, with a certain minimum length of sound channel being required. However, this minimum length is usually longer than the length of the housing in any of its dimensions. Owing to the configuration of the sound channel around the central axis, a sound channel is provided that has the necessary minimum length and nevertheless does not increase the construction space required for the sound generating device. For example, the sound channel can run fully within the housing.
- In general, the sound channel provides a path for the sound waves generated by the sound generator, said sound waves propagating along this path in an intended direction of propagation. In this respect, the sound waves propagating though the sound channel propagate substantially perpendicular to the central axis as the sound channel mainly extends around the central axis of the sound generator or of the opening within the housing. As a result, the sound generating device is compactly designed accordingly.
- The phrase “extending around the central axis of the sound generator or of the opening” means, inter alia, that the sound channel extends in a plane that is substantially parallel to the plane in which the opening is located, wherein the sound channel encloses the opening at least partially. The sound channel thus runs via a certain range of angles around the opening.
- The sound channel preferably extends not only in a straight line. For instance, the sound channel comprises rounded corners that ensure that the sound waves propagate through the sound channel mainly in the intended direction of propagation without being reflected back on the edges or corners of the sound channel.
- Within the scope of this disclosure, an “acoustic connection” is understood to mean that the airborne sound waves can travel between the connected spaces, wherein a passively vibrating membrane excited by the airborne sound waves does not interrupt the acoustic connection. The “acoustic connection” can also be termed “acoustic coupling”.
- The sound channel connects the rear side of the sound generator with the front side of the sound generator, in particular, exclusively within the sound generating device or the housing and not via the surrounding environment of the sound generating device or the housing. Thus, within the scope of this disclosure, the term “acoustic connection” does not include, in particular, connections with sound paths that extend—also partially—into the surrounding environment of the sound generating device or the housing.
- For instance, the sound generator is attached on a side of the opening on the housing wall and does not extend, therefore, through the opening.
- The sound channel is delimited, for example, by a bottom side of the housing wall so that the sound channel is provided on the side of the housing wall facing away from the rear volume. The sound channel can thus extend mainly, in particular fully on the front side of the loud speaker.
- In the horizontal section, the housing is, for instance rectangular, in particular quadratic. The corners of the rectangle may be rounded.
- Preferably, the sound channel is a bass reflex tube, thus enabling the sound pressure generated by the sound generator to be amplified at low-frequency vibrations.
- To achieve the necessary minimum length, the sound channel can comprise at least a curved and/or angled section.
- In an embodiment of the disclosure, the housing comprises a front volume, at which the front side of the sound generator is directed, and a rear volume, at which the rear side of the sound generator is directed, wherein a sound channel acoustically connects the rear volume with the front volume, thus effectively increasing the sound pressure.
- For this purpose, the sound generator may be located mainly in the rear volume.
- For example, the sound channel extends around the front volume and/or the front volume is encompassed at least in part, in particular mostly by the sound channel in a plane.
- For instance, the front volume has a central axis, wherein the sound channel at least in part extends around the central axis of the front volume. In this way, the sound channel can be designed without restricting the size of the front volume.
- To separate the front volume and the rear volume without any additional components, the housing wall can separate the front volume from the rear volume.
- To save on additional components, it is possible that the sound channel extends in a peripheral region of the housing, for instance, between a housing exterior wall and the opening.
- In an embodiment variant, the housing comprises an upper part and a bottom part, wherein the bottom part has the housing wall and a trough-shaped area. The opening is substantially closed on the side of housing wall facing away from the rear volume by the trough-shaped area. Thus, the installation of the sound generator is simplified.
- The upper part can take the form of a cap that is positioned on the bottom part so that the rear volume is enclosed by the upper part and the housing wall. The upper part in the form of a cap can also be termed a cover.
- The interior volume may be limited by the trough-shaped area and the sound generator in the opening.
- Preferably, the sound generator is provided on the bottom part, in particular on the side of the housing wall facing away from the rear volume, thus simplifying the installation further.
- In doing so, the sound channel, the housing wall, and the trough-shaped area may be formed together as a single piece.
- The entire bottom part can be realized as a single piece.
- To easily couple the sound generator to the vehicle exhaust system, the housing may comprise an output channel for acoustically connecting the sound generator with an exhaust pipe of the vehicle exhaust system, wherein the output channel extends from the front volume, in particular, wherein the sound channel opens into the output channel.
- For instance, the housing has a bottom side, wherein the sound channel, the output channel, and/or a base of the trough-shaped area is or are substantially parallel to the bottom side, in particular wherein the sound channel, the output channel, and/or a base of the trough-shaped area extends or extend from the bottom side. It is thus possible to provide the housing as a compact assembly with a defined external contour.
- The bottom side does not have to be continuous, but rather the bottom side may be regarded as a plane that delimits the housing.
- In an embodiment of the disclosure, the housing wall is arranged at an angle relative to the bottom side, thus enabling the sound emission of the sound generator to be improved.
- To further improve the sound emission, the output channel can extend on the side of the opening from the front volume that is furthest away from the bottom side.
- In an embodiment of the disclosure, the sound channel runs around the central axis in a range of angles of at least 90°, in particular at least 180°, particularly preferably at least 270°. In this way, the length of the sound channel can be chosen independently of the side length of the housing. The sound channel may have mostly an L, C, or U form in a top view.
- In addition, a vehicle exhaust system includes at least one sound generating device according to the disclosure and at least one exhaust pipe, wherein the sound generator of the sound generating device is acoustically coupled with the exhaust pipe.
- For instance, the output channel of the sound generating device opens into the exhaust pipe.
- Additional features and advantages of the disclosure can be found in the following description as well as the attached drawings to which reference is made. In the drawings:
-
FIG. 1 shows schematically a vehicle exhaust system according to the disclosure with a sound generating device according to the disclosure, -
FIG. 2 shows the sound generating device of the vehicle exhaust system according to the disclosure according toFIG. 1 in a perspective, partially transparent view, -
FIG. 3 shows a perspective view of the bottom side of the housing of the sound generating device according toFIG. 2 , -
FIG. 4 shows a section through the bottom part according toFIG. 3 along the plane IV-IV, -
FIG. 5 shows a simplified top view of the bottom part according toFIG. 3 , -
FIG. 6 shows a perspective view of a second embodiment of the sound generating device according to the disclosure, and -
FIG. 7 shows a section through the bottom part of the sound generating device according toFIG. 6 . - In
FIG. 1 , amotor vehicle 10 is schematically shown with avehicle exhaust system 12. Thevehicle exhaust system 12 directs exhaust gas generated by theinternal combustion engine 14 of themotor vehicle 10 into the surrounding environment of themotor vehicle 10. - To this end, the
vehicle exhaust system 12 comprises at least anexhaust pipe 16 and variousexhaust treatment devices 18, for example, particulate filter, catalytic converter and/or muffler. - Moreover, the
vehicle exhaust system 12 has asound generating device 20. - The
sound generating device 20 comprises ahousing 22 and asound generator 24, for example a loud speaker. - The
sound generator 24 is positioned in thehousing 22 and is enclosed by thehousing 22 so that it is protected from external environmental influences. - The
sound generating device 20 is acoustically connected with theexhaust pipe 16 so that the sound generated by thesound generator 24 can interact with the sound in theexhaust pipe 16. - The
sound generating device 20 is, for instance, part of an active silencer for reducing exhaust noise. In the case of such active silencers, thesound generator 24 generates noise which is in phase opposition to the engine noise coming from theinternal combustion engine 14. The noise coming from thesound generator 24 then interferes with the engine noise in theexhaust pipe 16, thus suppressing, or at least attenuating, the engine noise. - Such a
sound generating device 20 may also be used to change engine noise, by using thesound generator 24 to generate additional noise that can be added to the engine noise. For example, the noise of a sportier engine can thus be imitated. - In
FIG. 2 , thehousing 22 is shown in a perspective view. Thehousing 22 comprises anupper part 26 illustrated partially transparently and abottom part 28. Thebottom part 28 is shown inFIGS. 3 to 5 separately. - Collectively, the
upper part 26 and thebottom part 28 form the outer casing of thehousing 22, which is more or less cuboid in form in the shown embodiment and has a quadratic external contour in a horizontal section (FIG. 5 ), i.e. a section parallel to the partition plane T of theupper part 26 and thebottom part 28. The corners of the quadratic external contour may be rounded. - It is, of course, also conceivable that the outer casing or the
housing 22 is entirely spherical or has another form. - The interior of the
housing 22 is limited by the outer casing, in which thesound generator 24 is provided. - To this end, the
upper part 26 and thebottom part 28 are realized as mutually corresponding counterparts, for instance as half shells. - However, it is also conceivable that an adapter is provided between the
upper part 26 and thebottom part 28 in order to connect theupper part 26 with thebottom part 28. - In the shown embodiment, the
upper part 26 is only realized as a cap or cover that is placed on thebottom part 28. - The
housing 22 has an upper side O that is formed by theupper part 26 and a bottom side U that is formed by thebottom part 28. The upper side O is parallel to the bottom side U. - The upper side O is a continuous surface, whereas the bottom side U in the shown embodiment is not continuous, but can be regarded as a plane (cf.
FIG. 4 ) - The partition plane T, at which the
upper part 26 rests on thebottom part 28, is arranged at an angle in comparison to the upper side O and the bottom side U, i.e. that the bottom side U particularly includes an angle greater than zero with the partition plane T, as clearly evident inFIG. 3 . - The
bottom part 28 comprises ahousing wall 30 with anopening 32, a trough-shapedarea 34, asound channel 36 and anoutput channel 38. - The
bottom part 28 is preferably formed as a single piece, for instance as an injection moulded part. Thehousing wall 30, the trough-shapedarea 34, thesound channel 36 and theoutput channel 38 are then formed together as a single piece. - The
housing wall 30 is provided substantially parallel to the partition plane T, as can be seen in particular inFIGS. 3 to 5 . Thehousing wall 30 is thus arranged at angle to the bottom side U. - The
opening 32 for thesound generator 24 is located centrally in thehousing wall 30 and has a central axis M that is also the central axis of thesound generator 24. - The central axis M is perpendicular to the
housing wall 30 and the partition plane T. - A
shoulder section 40, on which thesound generator 24 rests at least on the edge or through which the sound generator is attached to thebottom part 28, is provided around theopening 32 on thehousing wall 30. As a result, thesound generator 24 closes theopening 32. - The front side of the
sound generator 24 is assigned through the opening to the underside of thehousing wall 30 or theopening 32, i.e. the side of thehousing wall 30 or the opening facing the bottom side U. At the same time, the rear side of thesound generator 24 is assigned to the upper side of thehousing wall 30 or of theopening 32, i.e. the side of thehousing wall 30 or of theopening 32 facing the upper side O of thehousing 22. - Through the
housing wall 30 and thesound generator 24 located at theopening 32, the interior space of thehousing 22 is thus divided into afront volume 42 and arear volume 44, which are assigned to the front side and the rear side of thesound generator 24. - The
rear volume 44 is delimited on the one hand by theupper part 26 and on the other hand by thehousing wall 30, wherein thesound generator 24 can be located fully in therear volume 44. - The
front volume 42 is delimited toward the upper side by thesound generator 24 and to the other side by thebottom part 28, more specifically the trough-shapedarea 34 of thebottom part 28. - In a top view, the trough-shaped
area 34 closes theopening 32 on the bottom side of thehousing wall 30. - The trough-shaped
area 34 thus forms thefront volume 42 and both also have a central axis that corresponds to central axis M of theopening 32. - The trough-shaped
area 34 connects directly to thehousing wall 30, in particular, thehousing wall 30 transitions directly on theopening 32 into the trough-shapedarea 34. - The
output channel 38 goes from thefront volume 42 and extends outwardly through anexterior wall 46 of thebottom part 28. The exterior wall is, for example, part of the outer casing of thehousing 22. - The
output channel 38 finally opens into theexhaust pipe 16. Via theoutput channel 38, thesound generator 24 and thefront volume 42 are thus acoustically coupled with theexhaust pipe 16. - For instance, the
output channel 38 extends on the side of the trough-shapedarea 34, at which the distance between thehousing wall 30 and the bottom side U is the greatest. - The bottom of the trough-shaped
area 34 and theoutput channel 38 are parallel to the bottom side U and form a part of the bottom side U. - The
sound channel 36 is provided to acoustically connect thefront volume 42 with arear volume 44. - The
sound channel 36 is among other things limited by the bottom side of thehousing wall 30 so that thesound channel 36 is provided on the side of thehousing wall 30 facing away from therear volume 44. - As can be seen in
FIG. 5 , thestart 48 of thesound channel 36 begins offset slightly clockwise from theoutput channel 38, wherein no acoustic connection exists at this point between thesound channel 36 and theoutput channel 38. - In the shown embodiment, originating from the
start 48 of thesound channel 36, thesound channel 36 runs along theexterior wall 46 and around theopening 32, the trough-shapedarea 34 and thesound generator 24, in particular in a plane that is substantially parallel to the plane in which theopening 32 is provided. - The
sound channel 36 thus runs around the central axis M until thesound channel 36 finally meets theoutput channel 38 again and opens into theoutput channel 38 there. - Of course, the
sound channel 36 can also run anticlockwise. - The
sound channel 36 thus covers a range of angles α around the central axis M that is greater than 180°, in particular greater than 270°. - In the view shown in
FIG. 5 which illustrates a projection of thesound channel 36, theopening 32 and the trough-shapedarea 34, it can be discerned easily that thesound channel 36 extends fully outside the trough-shapedarea 34, theopening 32 and thesound generator 24 within thehousing 22. - The
sound channel 36 thus extends in the peripheral region of thehousing 22 and comprisescurved sections 50 on the rounded corners of thehousing 22, said sections preventing the sound waves from being reflected. - This ensures that the
sound channel 36 provides a path for the sound waves generated by thesound generator 24, said sound waves propagating along this path in an intended direction of propagation. As thesound channel 36 mainly extends around the central axis M of thesound generator 24 or theopening 32 within thehousing 22, a suitably long path is created for the sound waves within thehousing 22, even though the housing is designed compactly. - A
connection opening 49, through which thesound channel 36 is connected to therear volume 44, is provided in thehousing wall 30 in the area of thestart 48 of thesound channel 36 to acoustically connect thesound channel 36 with therear volume 44. - The
connection opening 49 is thus located slightly offset clockwise to theoutput channel 38 in the shown embodiment. - The
rear volume 44 is acoustically connected with thefront volume 42 and theexhaust pipe 16 through thesound channel 36 that opens into theoutput channel 38. - An acoustic connection is understood to mean in this case that the airborne sound waves can travel from the
rear volume 44 into thefront volume 42 and theexhaust pipe 16, wherein a passively vibrating membrane, which can be located for instance in thesound channel 36, is not considered to be an interference for an acoustic connection, even though such a membrane does not let air pass. - Through this connection of the
rear volume 44 to thefront volume 42 and theexhaust pipe 16, thesound channel 36 forms a bass reflex tube with a length that is considerably greater than the side length of thehousing 22. - The
housing 22 and the entiresound generating device 20 can thus be designed compactly, while still enabling low tones to be transmitted powerfully. - In particular, it can be discerned in
FIG. 4 that the entire bottom part, thus thehousing wall 30, the trough-shapedarea 34, thesound channel 36 and theoutput channel 38, are formed together as a single piece, wherein the wall of thesound channel 26 forms theexterior wall 46 at the same time at least partially. - The
sound channel 36 is thus delimited by thehousing wall 30, theexterior wall 46, the housing wall of thebottom part 28 assigned to the bottom side U as well as a partition wall that is provided between the trough-shapedarea 34 and theexterior wall 46. - In
FIGS. 6 and 7 , a further embodiment of the sound generating device is shown that substantially corresponds to the first embodiment. Therefore, only the differences are discussed hereinafter, wherein the same parts or parts with the same function are provided with the same reference signs. - In
FIG. 6 , thebottom part 28 is shown with the attachedsound generator 24, whereas inFIG. 7 , a section through thebottom part 28 is shown. - In the second embodiment, the
housing wall 30 does not fully close thebottom part 28. From thehousing wall 30, there is however a shoulder section, on which thesound generator 24 is attached, so that the interior volume of thehousing 22 is divided into thefront volume 42 and therear volume 44. Therear volume 44 also extends into thebottom part 28 in the embodiment shown. - To close the
rear volume 44 despite the reducedhousing wall 30, the bottom side U is formed continuously, thus limiting therear volume 44 on the bottom side U. - Furthermore, the
sound generator 36 in the second embodiment is not located on the edge or theexterior wall 46 of thehousing 22, but runs very closely around theopening 32 or theshoulder section 40. The distance between thesound channel 36 and the trough-shapedarea 34 is approximately the width of theshoulder section 40. - Another difference of the second embodiment is that the
sound channel 36 only extends around the central axis M in a range area a of more than 90°, however less than 180°. - The
sound channel 36 then opens laterally from the trough-shapedarea 34 into therear volume 44. - In the second embodiment, the
sound channel 36 is delimited by thehousing wall 30, the housing wall of thebottom part 28 assigned to the bottom side U as well as two partition walls that are substantially parallel to each other. The partition walls are mostly radially spaced and extend around the trough-shapedarea 34. - What is thus common to both embodiments, is that the
sound channel 36 is delimited by thehousing wall 30 and housing wall of thebottom part 28 assigned to the bottom side U. - Further, the
sound channel 36 can be limited by at least one partition wall that is adjacent to the trough-shapedarea 34. Alternatively, the trough-shapedarea 34 can border thesound channel 36 itself, namely with the side opposite theopening 32. - Of course, different features of the various embodiments can be combined with each other as desired.
- In particular, it can be clearly discerned by comparing the two embodiments that the length of the
sound channel 36 and thus the length of the bass reflex tube can be changed to almost any length to enable precise acoustic tuning. To change the length, for example, the distance between the trough-shapedarea 34 and thesound channel 36 can be changed. The range of angles α, along which thesound channel 36 extends, can also be adjusted so that the length of thesound channel 36 is adjusted. - Although an embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this disclosure. For that reason, the following claims should be studied to determine the true scope and content of this disclosure.
Claims (20)
Applications Claiming Priority (3)
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DE102017127454 | 2017-11-21 | ||
DE102017127454.5A DE102017127454A1 (en) | 2017-11-21 | 2017-11-21 | Sound generating device and vehicle exhaust system |
DE102017127454.5 | 2017-11-21 |
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US10284944B1 US10284944B1 (en) | 2019-05-07 |
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US16/196,316 Active US10284944B1 (en) | 2017-11-21 | 2018-11-20 | Sound generating device as well as vehicle exhaust system |
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US (1) | US10284944B1 (en) |
KR (1) | KR20190058364A (en) |
CN (1) | CN110030059A (en) |
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US11208934B2 (en) | 2019-02-25 | 2021-12-28 | Cummins Emission Solutions Inc. | Systems and methods for mixing exhaust gas and reductant |
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US5119902A (en) * | 1990-04-25 | 1992-06-09 | Ford Motor Company | Active muffler transducer arrangement |
DE4342133A1 (en) * | 1993-12-10 | 1995-06-14 | Nokia Deutschland Gmbh | Arrangement for active noise reduction |
FI112909B (en) * | 2001-02-19 | 2004-01-30 | Genelec Oy | The structure of a reflex speaker and a method for forming it |
DE102004040421A1 (en) * | 2004-08-19 | 2006-03-09 | J. Eberspächer GmbH & Co. KG | Active exhaust silencer |
DE102006042224B3 (en) * | 2006-09-06 | 2008-01-17 | J. Eberspächer GmbH & Co. KG | Active sound absorber for exhaust-gas system of internal-combustion engine particularly in motor vehicle, has anti sound generator comprises membrane drive, with which anti sound generator is coupled with external wall of sound absorber |
DE202008008322U1 (en) * | 2008-06-20 | 2008-09-04 | Wiechmann, Rainer | Subwoofer enclosure |
EP2293288A1 (en) * | 2009-09-07 | 2011-03-09 | Remus Innovation Forschungs- und Abgasanlagen-Produktionsgesellschaft m.b.H. | Device for discharging acoustic signals for vehicles |
DE102011084567C5 (en) * | 2011-10-14 | 2019-08-14 | Eberspächer Exhaust Technology GmbH & Co. KG | Active muffler |
EP2797075B1 (en) * | 2013-04-26 | 2018-09-12 | Eberspächer Exhaust Technology GmbH & Co. KG | System for influencing exhaust noise, engine noise and/or intake noise |
DE102013208186B4 (en) * | 2013-05-03 | 2016-09-22 | Eberspächer Exhaust Technology GmbH & Co. KG | Sound generator for an exhaust system |
DE102013113803A1 (en) * | 2013-12-10 | 2015-06-11 | Eberspächer Exhaust Technology GmbH & Co. KG | Sound generator for a system for influencing exhaust noise of a motor vehicle |
JP2015172370A (en) * | 2014-03-04 | 2015-10-01 | エーバーシュペッヒャー・エグゾースト・テクノロジー・ゲーエムベーハー・ウント・コンパニー・カーゲー | active design of exhaust sound |
US9394812B2 (en) * | 2014-07-09 | 2016-07-19 | Aai Corporation | Attenuating engine noise using a reverse resonator |
DE102017103636A1 (en) * | 2016-04-06 | 2017-10-12 | Eberspächer Exhaust Technology GmbH & Co. KG | SYSTEM AND METHOD FOR ACTIVE SOUND INFLUENCE |
US10017008B1 (en) * | 2017-06-16 | 2018-07-10 | Liang Fei Industry Co., Ltd. | Subsidiary loudspeaker for vehicles and bikes |
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2017
- 2017-11-21 DE DE102017127454.5A patent/DE102017127454A1/en not_active Withdrawn
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2018
- 2018-11-20 US US16/196,316 patent/US10284944B1/en active Active
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- 2018-11-21 FR FR1871658A patent/FR3076318B1/en not_active Expired - Fee Related
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KR20190058364A (en) | 2019-05-29 |
US10284944B1 (en) | 2019-05-07 |
FR3076318A1 (en) | 2019-07-05 |
DE102017127454A1 (en) | 2019-05-23 |
CN110030059A (en) | 2019-07-19 |
FR3076318B1 (en) | 2021-04-02 |
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