DE102017203184A1 - Sound generating device for generating exhaust system sound with multiple output ports and an associated motor vehicle - Google Patents

Sound generating device for generating exhaust system sound with multiple output ports and an associated motor vehicle

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Publication number
DE102017203184A1
DE102017203184A1 DE102017203184.0A DE102017203184A DE102017203184A1 DE 102017203184 A1 DE102017203184 A1 DE 102017203184A1 DE 102017203184 A DE102017203184 A DE 102017203184A DE 102017203184 A1 DE102017203184 A1 DE 102017203184A1
Authority
DE
Germany
Prior art keywords
sound
generating device
exhaust
sound generating
motor vehicle
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.)
Pending
Application number
DE102017203184.0A
Other languages
German (de)
Inventor
Claus Freytag
Axel Brombach
Martin Unbehaun
Christian Reinheimer
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.)
Audi AG
Original Assignee
Audi AG
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 Audi AG filed Critical Audi AG
Priority to DE102017203184.0A priority Critical patent/DE102017203184A1/en
Publication of DE102017203184A1 publication Critical patent/DE102017203184A1/en
Application status is Pending legal-status Critical

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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K13/00Cones, diaphragms, or the like, for emitting or receiving sound in general
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00Acoustics not otherwise provided for
    • G10K15/04Sound-producing devices
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00Acoustics not otherwise provided for
    • G10K15/04Sound-producing devices
    • G10K15/06Sound-producing devices using electric discharge

Abstract

The present invention relates to a sound generating device (S) comprising a sound box (1) and an upstream exhaust sound sensor (3) for generating exhaust noise of a motor vehicle (automobile). The resonance body (1) of the sound generating device (S) has a plurality of outlet openings (7,8), of which at least one via a connection device (9) with an exhaust pipe (A) or a Abgasrohrimitat (AI) is acoustically connected and at least one output opening the emitted artificially generated sound directly into the environment.

Description

  • The present invention relates to a sound generating device having at least two output ports comprising a resonant body and an upstream Abgasanlagensoundaktor for generating exhaust noise of a motor vehicle, wherein at least one of the output ports is connected to an exhaust pipe or a Abgasrohrimitat. The invention also relates to a motor vehicle equipped with such a sound generating device.
  • The sound pattern of a motor vehicle, also called a vehicle sound, can be influenced by acoustic optimization of the engine and exhaust system in such a way that it is positively perceived by the vehicle occupants and pedestrians. Primarily, this is done via targeted design of passive silencers in the exhaust system. However, the possibilities of passive sound design are limited. Especially with higher demands on the sound pattern, the tuning is done by the use of active elements such. Exhaust system sound actuators, which are understood as sound sources such as speakers, which emit controlled exhaust noise. This can be vehicles with a desired, brand-defining sound represent.
  • In order to allow a high sound pressure level over a large frequency range, it is necessary to obstruct powerful loudspeakers. But this requires a high space requirement, a high weight, and a high electrical energy consumption.
  • By so-called "warm" Abgasanlagensoundaktoren artificially generated sound waves are directed into the exhaust pipe, which are emitted at the end of the exhaust pipe into the environment. However, the possibility of influencing the noise emitted by an exhaust pipe is limited by the geometric parameters of the exhaust pipe. In addition, resonances occurring in the exhaust pipe can adversely affect the sound image. Therefore, so-called "cold" Abgasanlagensoundaktoren used in motor vehicles, which do not conduct the sound generated by them in exhaust pipes, and thus are acoustically independent of these.
  • In the case of "cold" exhaust system sound actuators, if the emission location of the artificially generated noises deviates from that of the genuine exhaust system noises, the listener experiences an unauthentic noise.
  • The DE 10 2014 101 826 B4 discloses a sounder system for motor vehicles with at least one loudspeaker in a housing, wherein at least two sound conductor stubs are acoustically coupled to the housing, which extend the sound space into the vehicle rear end as well as into the vehicle area of the engine. In this case, the area of the exhaust pipes can be acoustically coupled to the system.
  • The DE 691 12 259 T2 discloses an active apparatus for noise removal in a line to be used in motor vehicles, which includes a force transducer for output pulse trains. The output pulse train is in antiphase to a, measured by a pickup Eintrittsimpulszug at a predetermined point. In this case, the front and back of the force transducer can be connected via its own output to the line
  • JPH07248783A discloses an active silencer wherein a loudspeaker can be connected via sound pipes via a plurality of outlet openings with a pipe in order to produce a plurality of destructive sound waves in the pipe can.
  • The object of the invention is to make available a component which makes it possible to produce artificial exhaust system noise for the emission via exhaust pipes efficiently and in a space-saving manner, and in addition to permit acoustic emission of the exhaust gas-conducting pipes which is as independent as possible.
  • The object is solved by the subject matters of the independent claims. Advantageous developments of the invention are given by the features of the dependent claims.
  • According to the invention, a sound generating device for generating exhaust system noise of a motor vehicle is provided. A resonating body of the sound generating device has a resonant air volume.
  • This sound generating device is further developed according to the invention to solve the above object as follows.
  • The resonant body of the sound generating device has at least two output ports, wherein at least one output port emits the exhaust gas sound directly into the environment. In other words, at least one exit opening is an open mouth. Thus, this part of the sound is not routed through the exhaust system or an imitation thereof. This has the advantage that this part of the artificially generated sound only minimally by the acoustic properties of the Exhaust system or its imitation is influenced, including, among other resonances of the exhaust pipe or its imitation, and include the size of the exhaust pipe opening. Likewise, no losses occur due to long ways to the sound actuator. The exit opening of the resonance body may also be attached to a location which is not visible from the outside for a standing person. Thus, the shape, position and size of the exit aperture surface for acoustic emission can be optimized to a greater extent by greater independence from local space limitations.
  • At least one exit opening has a connection device that is set up to provide an acoustic connection of the exit opening with an exhaust pipe or an exhaust pipe imitation. In other words, at least one exit opening directs the sound via a connection device into an exhaust pipe or a Abgasrohrimitat. This results in the advantage that a part of the artificially generated sound is emitted at the same location as the real engine noise and thus acts more authentically on a listener. In addition, in the case of the use of an exhaust pipe, the exhaust gas outlet opening is flowed through by warm exhaust gases. Thus, this exit opening is kept free of foreign bodies and ice by the warm exhaust gases, which is not the case with an open mouth.
  • The sound box of the sound generating device has an intake port for introducing the noises from the exhaust system sound actuator output. It is preferably provided that the Abgasanlagensoundaktor is directly connected to the inlet opening.
  • According to a development, the resonance body of the sound generating device, starting from the inlet opening in a first section in the form of a funnel with a funnel length, which ends with a base surface having the largest cross-sectional area of the funnel. The outlet of the exhaust system sound actuator is thus adjoined by a funnel which has a widened configuration and whose opening at the other end opposite the outlet has a clear cross section or passage cross section of the size of the base area. From there, the resonance body extends in a second section as a truncated cone or cylinder or generally as a stump over a stump length to an exit opening. Funnel is to be understood in the context of the invention not only a rotationally symmetric funnel. The funnel shape can be designed as a lateral surface of a truncated cone or truncated pyramid or generally a symmetrical or asymmetrical contour of the cross-sectional area formed perpendicular to the funnel axis. It is only important that an airborne sound emerging from the outlet of the exhaust system sound actuator is guided in an air volume which is widened from the outlet and is limited by a wall of the resonance body. The stump connected to the exit opening of the funnel shape, that is to say the base area of the funnel shape, may be configured in the shape such that its cross-sectional area becomes identical or becomes smaller due to a taper of the stump in the direction of the exit opening or larger due to an expansion.
  • The inlet opening area, the base area, the outlet opening area, the funnel length and the stump length are selected in this development such that at least two dominant resonances occur in the frequency range between 200 Hz and 600 Hz. Between the resonances, the sound pressure level drops less than 15 dB or at most 15 dB due to the transmission characteristic of the sound generating device. In other words, a broadband resonance range is provided by a corresponding design of said geometric parameters of the sound generating device. The advantage of the invention is that the loudspeaker level is amplified over a wide range of the frequency range necessary for an authentic sound
  • According to a development, the outlet opening is inclined by an angle of inclination with respect to the smallest possible cross-sectional area. In other words, the exit opening is not in the smallest possible cross section or perpendicular to the funnel axis. By this arrangement, the area of the exit opening of the resonance body is larger than the cross-sectional area. As a result, a larger radiation cross-section is present, whereby the attenuation, in particular of sound waves of the lower frequencies, which occurs when leaving the output port, is reduced. In other words, occurs through a larger area of the outlet opening, a smaller reduction in the sound pressure level.
  • According to a development, the sound generating device has a heating device. It may be an exhaust pipe, which extends through the resonator body, or is in thermal contact with this via a metallic coupling. Additionally or alternatively, the heater may also be an electrical heater. In other words, the sound generating device may be heated by waste heat of the exhaust system and / or electricity. This has the advantage that the sound generating device can be heated. Thus, it is possible to prevent icing of the resonator body, in particular when using a larger outlet opening, and / or to melt snow which has penetrated.
  • According to a development, a grid which separates the inlet opening from the outlet opening is located in the interior of the resonance body. In other words, a grid is installed in the resonance body so that it is located between the inlet opening and the outlet opening. This has the advantage that the Abgasanlagensoundaktor is protected even when using a larger outlet opening from foreign bodies and small animals, without significantly affecting the sound propagation. Preferably, the grating is located at a location in the sound box with low acoustic velocity to minimize the amount of local swirling.
  • The invention also includes a motor vehicle. The motor vehicle according to the invention has an embodiment of the sound generating device according to the invention. The sound box has at least two outlet openings. At least one of the outlet openings is acoustically connected via an attachment device to an exhaust pipe or an exhaust pipe imitation.
  • In the following an embodiment of the invention is described.
  • Show it:
    • 1 a schematic representation of a sound generating device according to the invention;
    • 2a schematic representation of a "warm"Abgasanlagensoundaktors;
    • 2 B schematic representation of a "cold" exhaust system sound actuator;
    • 3a a schematic representation of a sound generating device according to the invention;
    • 3b a schematic representation of a sound generating device according to the invention;
    • 4a schematic representations of the sound pressure level plotted against the excitation frequency for a "warm" exhaust system sound actuator; and
    • 4b schematic representations of the sound pressure level, plotted against the excitation frequency for a sound generating device according to the invention;
  • The following illustrated embodiment is a preferred embodiment of the invention. In the exemplary embodiment, the components of the embodiment described in each case represent individual, independently of one another, the features of the invention, which each further develop the invention independently of one another and thus also individually or in a different combination than the one shown as part of the invention. Furthermore, the described embodiment can also be supplemented by further features of the invention already described.
  • Corresponding 1 has a sound generating device S, a sound box 1 with an entrance opening 2 for an upstream exhaust system sound actuator 3 of a motor vehicle. The entrance opening area 2 has a size which corresponds to that of a circle with a diameter of 3 cm to 15 cm. Starting from the inlet opening 2 is the sound box 1 designed with respect to the shape of a funnel, which funnel length 4 and a floor space 5 having. The funnel length 4 is 2 cm to 15 cm. At the base 5 the funnel has its largest area, which corresponds to that of a circle with a diameter of 6 cm to 25 cm. The base may, for example, have the shape of an ellipse or a rectangle, for example with rounded corners. The opening angle θ of the funnel is in a range of 20 ° to 160 °. Starting from the base area 5 The resonator body extends as a stump over a stump length 6 and has an exit opening at its end 7 on. The total length of the resonance body is 18 cm to 60 cm and consists of a funnel length 4 and a stump length 6 together. The stump length 6 forms the remaining length of the resonator, minus the funnel length 4 , In this case, the cross-sectional area starting from the base surface 5 to the exit opening 7 rejuvenate, stay the same or enlarge. The area of the exit opening 7 may be arranged parallel to the smallest possible cross-sectional area, or inclined at an angle α, whereby the surface of the exit opening 7 is enlarged. The exit opening 7 has an area which is at most a factor of 1.5 greater or smaller than that of the base area 5 , The resonances take place in a cavity of the resonator 1 instead of the described geometric parameters relate to the shape of this cavity. The sound box 1 can have a second exit port 8th from which sound is emitted into the environment, or at which a connection device 9 is attached for sound transmission. The sound generating device S can be controlled by a heater 10 feature. This can be an exhaust pipe 10a which pass through the interior of the sound box 1 runs or thermally connected via a metallic coupling with the sound box. The heating element 10 can also have an electric heater 10b include. In the interior of the sound box 1 can also be a grid 11 be arranged, which is designed so that the sound pressure is not significantly reduced and a penetration of foreign bodies or small animals, which the Abgasanlagensoundaktor 3 damage is prevented.
  • 2a shows a so-called "warm" Abgasanlagensoundaktor WA which directs the artificially generated sound in an exhaust pipe A of the motor vehicle Kfz.
  • 2 B shows a common "cold" Abgasanlagensoundaktor KA, which emits the artificially generated sound directly into the environment and is not acoustically connected to the exhaust pipe A of the motor vehicle.
  • 3a shows a motor vehicle vehicle whose inventive resonant body 1 an exit opening 7 which emits a part of the sound directly into the environment, and a second output port 8th , which directs a part of the sound in a Abgasrohrimitation AI.
  • 3b shows a motor vehicle vehicle whose inventive resonant body 1 an exit opening 7 which emits a part of the sound directly into the environment, and a second output port 8th which directs a part of the sound into an exhaust pipe A.
  • 4a schematically shows a possible sound pressure level profile plotted against the excitation frequency of a vehicle exhaust noise, which is represented by the output port of a common "warm" Abgasanlagensoundaktor WA. In this case, several steeply rising level maxima can be seen, which are generated by resonances f R of the exhaust pipe A.
  • 4b schematically shows a possible sound pressure level profile plotted against the excitation frequency of a vehicle exhaust noise, which are emitted through the output openings 7,8 of a resonator of a sound generating device S according to the invention. The level maxima of the resonance frequencies f R generated by the exhaust pipe A are superimposed by the level maxima L p R1 , L p R1 of the two dominating resonances f R1 , and f R2 . By choosing the geometric parameters, the difference of the sound pressure level ΔL p between the highest sound pressure level L p max and the minimum L p min between 200 Hz and 600 Hz is at most 15 dB.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 102014101826 B4 [0006]
    • DE 69112259 T2 [0007]

Claims (6)

  1. A sound generating device (S) comprising a sound box (1) and an exhaust sound sensor (3) for generating artificial exhaust noise of a motor vehicle (car), characterized in that the sound box (1) has an inlet opening (2) for admitting the exhaust noise from the output of the sound system Abgasanlagensoundaktors (3), and at least two output ports, wherein at least one output port (7) emits the exhaust system noise directly into the environment and at least one output port (8) has a connection device (9) which is adapted to an acoustic connection of the output port ( 8) with an exhaust pipe or a Abgasrohrimitat the exhaust system to provide.
  2. Sound generating device (S) according to Claim 1 , characterized in that the resonance body (1), starting from an inlet opening (2) for admitting the Abgasanlagengeräusche from the output of Abgasanlagensoundaktors (3) has a shape of a funnel with a base (5) and then as a stump with a constant, magnifying or the tapered cross-section extends to an outlet opening (7), wherein the sound generating device (S) by the respective value of the inlet opening area (2), the base area (5), the Ausgangsöffnungsfläche (7), the funnel length (4) and the stump length ( 6) is designed so that at least two dominant resonance frequencies of the sound generating device (S) are in the range between 200 Hz and 600 Hz, wherein a transmission characteristic of the sound generation device (S) for sound pressure level between the resonance frequencies by less than 15 dB or at most 15 dB below the value of the maximum sound pressure level (L p max ) of the resonances falls.
  3. A sound generating device (S) according to any one of the preceding claims, characterized in that the output port (7) of the resonance body (1) is inclined by an inclination angle (a) with respect to the smallest possible cross-sectional area of the stump.
  4. A sound generating device (S) according to any one of the preceding claims, characterized in that it comprises a heating device (10), which is an exhaust pipe (10a) extending through the resonance body (1) or in thermal contact therewith via a metallic coupling or / and an electric heater (10b).
  5. A sound generating device (S) according to any one of the preceding claims, characterized in that there is a grating (11) in the resonance body which separates the inlet opening (2) from at least one outlet opening (7) of the sound box (1).
  6. Motor vehicle (motor vehicle) comprising a sound generating device (S) according to one of the preceding claims.
DE102017203184.0A 2017-02-28 2017-02-28 Sound generating device for generating exhaust system sound with multiple output ports and an associated motor vehicle Pending DE102017203184A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102017203184.0A DE102017203184A1 (en) 2017-02-28 2017-02-28 Sound generating device for generating exhaust system sound with multiple output ports and an associated motor vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017203184.0A DE102017203184A1 (en) 2017-02-28 2017-02-28 Sound generating device for generating exhaust system sound with multiple output ports and an associated motor vehicle

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08121141A (en) 1994-10-24 1996-05-14 Toa Corp Muffler
DE102010007013A1 (en) 2010-02-05 2011-08-11 J. Eberspächer GmbH & Co. KG, 73730 Exhaust system
DE102013208098A1 (en) 2013-05-03 2014-11-06 Eberspächer Exhaust Technology GmbH & Co. KG Road vehicle
US20150255054A1 (en) 2014-03-04 2015-09-10 Eberspächer Exhaust Technology GmbH & Co. KG Active design of exhaust sounds
WO2016193706A1 (en) 2015-06-05 2016-12-08 Jez Brandon Directional acoustic system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08121141A (en) 1994-10-24 1996-05-14 Toa Corp Muffler
DE102010007013A1 (en) 2010-02-05 2011-08-11 J. Eberspächer GmbH & Co. KG, 73730 Exhaust system
DE102013208098A1 (en) 2013-05-03 2014-11-06 Eberspächer Exhaust Technology GmbH & Co. KG Road vehicle
US20150255054A1 (en) 2014-03-04 2015-09-10 Eberspächer Exhaust Technology GmbH & Co. KG Active design of exhaust sounds
WO2016193706A1 (en) 2015-06-05 2016-12-08 Jez Brandon Directional acoustic system

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