CN111720189A - Sound quality adjusting device and method for exhaust system - Google Patents
Sound quality adjusting device and method for exhaust system Download PDFInfo
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- CN111720189A CN111720189A CN201910223476.4A CN201910223476A CN111720189A CN 111720189 A CN111720189 A CN 111720189A CN 201910223476 A CN201910223476 A CN 201910223476A CN 111720189 A CN111720189 A CN 111720189A
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- 239000012528 membrane Substances 0.000 claims abstract description 15
- 238000003780 insertion Methods 0.000 claims description 34
- 230000037431 insertion Effects 0.000 claims description 34
- 230000030279 gene silencing Effects 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 230000003584 silencer Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 5
- 230000000149 penetrating effect Effects 0.000 claims 2
- 238000003908 quality control method Methods 0.000 claims 2
- 239000000446 fuel Substances 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- 230000010349 pulsation Effects 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
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- 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
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
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- 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
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
- G10K9/20—Sounding members
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention provides an exhaust system sound quality adjusting device which comprises a sounding shell, a connecting pipe, a frequency modulator and a vibrating device, wherein the sounding shell is arranged on an exhaust tail pipe, the sounding shell comprises a resonant cavity, the connecting pipe is communicated with the sounding shell and the exhaust tail pipe, the frequency modulator moves up and down in the connecting pipe, the vibrating device is arranged at one end, far away from the exhaust tail pipe, of the sounding shell and is used for driving the sounding shell to vibrate, the vibrating device comprises a vibrating membrane and a first controller, the vibrating membrane can drive the resonant cavity to vibrate, the first controller is used for controlling the vibrating membrane to vibrate, and the vibrating membrane is fixedly connected to the circumferential inner wall of. The invention also relates to a sound quality adjusting device and method for the exhaust system, which are used for solving the problems that the sound pressure suddenly drops and is not pleasant enough when the exhaust noise of the fuel vehicle rises along with the rotating speed of the engine, improving the sound quality of the exhaust system and providing better exhaust sound for the whole vehicle.
Description
Technical Field
The invention relates to the field of vehicle bodies, in particular to a device and a method for adjusting sound quality of an exhaust system.
Background
With the improvement of living standard of people, the requirements of people on the whole vehicle are changed from the original tools for riding instead of walk to comfortable household necessities, so that the requirements on the sound quality of the whole vehicle are also improved besides the stricter requirements on the dynamic property of the vehicle type, and the optimization of the noise of the whole vehicle in the running and accelerating processes is particularly important. The exhaust system is an important component of the automobile, and combustion noise is brought to the tail of the automobile while exhaust gas is exhausted, so that order noise and friction noise with high sound pressure level can be generated at the tail of the automobile, the noise is transmitted to the passenger cabin, and the resonance of the sound cavity of the passenger cabin caused by the mode of the sound cavity of the passenger cabin is possibly excited, so that the NVH of the whole automobile is seriously influenced.
At present, most vehicle models are not provided with an exhaust system sound quality adjusting device, and even though some vehicle models are provided with electromagnetic valves, the electromagnetic valves mainly reduce back pressure and flow noise and cannot compensate sound loss under certain rotating speeds; some vehicle models use front end exhaust pulsation as excitation to compensate exhaust sound by resonance of a resonant cavity, but the sound quality compensation device can only compensate sound at a rotating speed or frequency, cannot change along with the change of the rotating speed or the frequency to compensate sound of different frequencies, and cannot adjust the amplitude of the sound, so that the sound quality adjustment is limited.
Disclosure of Invention
Accordingly, there is a need for an exhaust system sound quality adjusting apparatus and method that can improve the noise quality of the entire vehicle.
The invention provides an exhaust system sound quality adjusting device which comprises a sounding shell, a connecting pipe, a frequency modulator and a vibrating device, wherein the sounding shell is arranged on an exhaust tail pipe, the sounding shell comprises a resonant cavity, the connecting pipe is communicated with the sounding shell and the exhaust tail pipe, the frequency modulator moves up and down in the connecting pipe, the vibrating device is arranged at one end, far away from the exhaust tail pipe, of the sounding shell and is used for driving the sounding shell to vibrate, the vibrating device comprises a vibrating membrane and a first controller, the vibrating membrane can drive the resonant cavity to vibrate, the first controller is used for controlling the vibrating membrane to vibrate, and the vibrating membrane is fixedly connected to the circumferential inner wall of.
Furthermore, the sounding shell comprises a first shell and a second shell which is assembled on the first shell to form the resonant cavity, a first through hole is formed in the first shell, one end of the connecting pipe is fixedly connected with the first through hole, and the other end of the connecting pipe is fixedly connected with the tail pipe; the diaphragm is fixed in the second housing.
Furthermore, the first shell is also provided with a second through hole, and the frequency modulator comprises a first insert tube of a hollow tube, a second insert tube of a solid tube and a connecting substrate for connecting the first insert tube and the second insert tube on the same horizontal plane; exhaust system sound quality adjusting device is still including control the second controller of frequency modulator up-and-down motion, be equipped with the third through-hole that corresponds first through-hole on the second controller and correspond the fourth through-hole of second through-hole, pass first through-hole first insert tube passes the third through-hole inserts the connecting pipe passes the second through-hole the second insert tube passes the fourth through-hole, second controller rigid coupling in first casing.
Further, the length of the first insertion tube is less than or equal to the maximum length from the first through hole to the connection tube, and the diameter of the first insertion tube is greater than that of the second insertion tube.
Further, a sealing gasket is arranged between the second insertion pipe and the second through hole.
Further, the second controller is an electromagnetic mechanical device or a hydraulic control system which can control the frequency modulator to move up and down to change the resonant frequency of the resonant cavity according to a frequency control signal which is transmitted by the ECU and corresponds to the noise frequency and the vibration amplitude under the rotating speed.
Further, the second casing include the rigid coupling in the open end of first casing and with the sealed end that the open end is relative, the terminal surface of sealed end is equipped with the fifth through-hole, first controller include the base and by the center of base outwards extends the connection that forms with, connect with passing fifth through-hole and terminal rigid coupling in the vibrating diaphragm.
Further, the first controller is a vibration excitation controller which can control the connection of the first controller and the reciprocating motion in the fifth through hole according to a frequency control signal which is transmitted by the ECU and corresponds to the noise frequency and the vibration amplitude under the rotating speed.
Further, the second shell is of a cylindrical structure, and the first shell is an end cover fixedly connected to the circumferential outer surface of the opening end of the second shell.
The invention also provides an exhaust system sound quality adjusting method, which comprises the following steps of adjusting the sound quality of the tail pipe by using the exhaust system sound quality adjusting device:
when the ECU judges that the tail pipe does not need sound compensation according to the noise frequency and the amplitude under the rotating speed, the sounding shell and the connecting pipe form a silencer, the ECU transmits a silencing frequency control command to the second controller, the second controller controls the frequency modulator to move up and down according to the silencing frequency control signal transmitted by the ECU, the length of the first inserting pipe in the connecting pipe is changed, and the silencing frequency of the resonant cavity is adjusted;
when the ECU judges that the tail pipe needs sound compensation according to the noise frequency and the amplitude under the rotating speed, a target frequency and a target amplitude control signal corresponding to the sound compensation are transmitted to the first controller and the second controller, the first controller vibrates according to the control signal transmitted by the ECU to drive the vibrating membrane to vibrate and excite the resonant cavity to vibrate at the first vibration frequency, the second controller controls the frequency modulator to move up and down in the connecting pipe according to the control signal to adjust the vibration frequency of the resonant cavity to the first vibration frequency, the resonant cavity resonates and produces sound, and the sound is transmitted to the tail pipe through the connecting pipe to complete the sound compensation of the tail pipe.
In summary, the sound producing shell including the resonant cavity inside is connected to the tail pipe through the connecting pipe, the frequency modulator capable of moving up and down to adjust the vibration frequency of the resonant cavity is arranged at one end of the sound producing shell close to the tail pipe, and the vibrating membrane capable of driving the resonant cavity to vibrate is arranged at the other end of the sound producing shell, so that the sound compensating and silencing functions are realized, the problems that the sound pressure suddenly drops and is unpleasant when the exhaust noise of the fuel vehicle rises along with the rotation speed of the engine are solved, and the sound quality of an exhaust system is improved. .
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an apparatus and method for adjusting the acoustic quality of an exhaust system according to the present invention;
FIG. 2 is a schematic cross-sectional view taken along A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is an enlarged schematic view of a region I in FIG. 3;
FIG. 5 is a schematic view of a first housing of the sound shell of FIG. 1;
FIG. 6 is a schematic structural diagram of a second housing of the sound-generating housing of FIG. 1;
FIG. 7 is a schematic view of the structure of FIG. 6 from another perspective;
FIG. 8 is a schematic structural view of the connection tube in FIG. 1;
FIG. 9 is a schematic diagram of the frequency modulator of FIG. 1;
FIG. 10 is a schematic diagram of a second controller for controlling the up-and-down movement of the frequency modulator of FIG. 1;
FIG. 11 is a schematic view of the gasket of FIG. 1 installed between a second insert tube and a second through hole;
fig. 12 is a schematic structural diagram of a first controller for controlling vibration of the diaphragm of fig. 1;
fig. 13 is a schematic structural view of the diaphragm of fig. 1.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 1-13, the present invention provides an exhaust system sound quality adjusting device, which includes a sounding housing 10 disposed on a tail pipe 20 and including a resonant cavity 100 therein, a connecting pipe 30 communicating the sounding housing 10 and the tail pipe 20, a frequency modulator 40 moving up and down in the connecting pipe 30, and a vibrating device 50 disposed on an end of the sounding housing 10 away from the tail pipe 20 to drive the sounding housing 10 to vibrate.
Referring to fig. 1-3, the present invention changes the length of the frequency modulator in the connection pipe 30 by the frequency modulator 40 moving up and down in the connection pipe 30, so that the vibration frequency of the resonant cavity 100 continuously changes, and the working frequency range of the acoustic quality adjusting device is enlarged.
Meanwhile, the vibration device 50 includes a vibration film 51 capable of driving the resonance cavity 100 to vibrate and a first controller 52 for controlling the vibration of the vibration film 51, and the vibration film 51 is fixedly connected to the circumferential inner wall of the sound shell 10, when the first controller 52 controls the vibration film 51 to vibrate, the vibration of the resonance cavity 100 (sound cavity) is driven, the control is accurate, and the control is correspondingly timely, so as to achieve the purpose of sound compensation or sound elimination of the tail pipe 20; in a preferred embodiment of the present invention, the diaphragm 51 is a circular diaphragm with a concave center, which is made of durable material, so that the vibration of the resonant cavity 100 is easily excited by the first controller 52.
Referring to fig. 4-7, the sounding housing 10 of the present invention includes a first housing 11 and a second housing 12 assembled to the first housing 11 to form the resonant cavity 100.
Specifically, the first housing 11 is provided with a first through hole 111 and a second through hole 112.
Referring to fig. 1 and 8 again, one end of the connection pipe 30 is fixedly connected to the first through hole 111, and the other end is fixedly connected to the tail pipe 20; in a preferred embodiment of the present invention, two ends of the connecting pipe 30 are respectively welded to the first through hole 111 and the tail pipe 20, and the end of the connecting pipe 30 is flush with the inner surface of the first housing 11 (the end surface of the first through hole 111 located in the first housing 11), so that the first housing 11 is fixedly connected to the tail pipe 20 through the connecting pipe 30, and when the sounding housing 10 sounds, the sound is transmitted to the tail pipe 20 through the connecting pipe 30.
As shown in fig. 9, in the present invention, the frequency modulator 40 includes a first insertion tube 41 of a hollow tube, a second insertion tube 43 of a solid tube, and a connection substrate 42 connecting the first insertion tube 41 and the second insertion tube 43 on the same horizontal plane, and the first insertion tube 41 and the second insertion tube 43 move up and down synchronously, so as to ensure that the vertical heights of the frequency modulator 40 (the first insertion tube 41 and the second insertion tube 43) in the resonant cavity 100 are always consistent, and ensure the accuracy and timeliness of the response of the resonant cavity 100.
Correspondingly, as shown in fig. 10, the exhaust system sound quality adjusting apparatus further includes a second controller 60 for controlling the frequency modulator 40 to move up and down, and the second controller 60 is provided with a third through hole 61 corresponding to the first through hole 111 and a fourth through hole 62 corresponding to the second through hole 112.
The first insertion tube 41 passing through the first through hole 111 passes through the third through hole 61 and is inserted into the connection tube 30, the second insertion tube 43 passing through the second through hole 112 passes through the fourth through hole 62, the second controller 60 is fixedly connected to the outer surface of the end of the first housing 11, the length of the first insertion tube 41 is less than or equal to the maximum length from the first through hole 111 to the connection tube 30, and the diameter of the first insertion tube 41 is greater than that of the second insertion tube 43, so as to ensure that the first insertion tube 41 moves up and down in the adjustment hole formed by the first through hole 111, the third through hole 61 and the connection tube 30, so that when the lengths of the first insertion tube 41 in the adjustment hole are different, the resonance cavity 100 has different vibration frequencies, and sensitivity and accuracy of resonance frequency adjustment of the resonance cavity are ensured.
Referring again to fig. 9, in a preferred embodiment of the present invention, a first insertion tube 41 and a second insertion tube 43 are perpendicularly connected to both ends of a connection substrate 42; meanwhile, the second controller 60 is an electromagnetic mechanical device or a hydraulic control system that can control the up-and-down movement of the frequency modulator 40 to change the length of the first insertion tube 41 in the connection tube 30 according to a frequency control signal corresponding to the noise frequency and the vibration amplitude at the rotation speed transmitted by the ECU, and finally realize the adjustment of the resonant frequency of the resonant cavity 100, and it can be understood that the frequency modulator 40 moves up and down under the control of the second controller 60, and changes the frequency of the resonant cavity 100 by changing the length thereof, thereby adjusting the vibration frequency of the resonant cavity 100.
As shown in fig. 11, in the present invention, a sealing gasket 70 for ensuring the sealing performance of the resonant cavity 100 is further installed between the second insertion tube 43 and the second through hole 112, and the sealing gasket 70 is a steel wool graphite pad with superior durability, so as to ensure the resonant effect of the resonant cavity 100.
Referring again to fig. 6, 7, 12 and 13, in the present invention, the second housing 12 includes an opening end 12a fixedly connected to the first housing 11 and a sealing end 12b opposite to the opening end 12a, a fifth through hole 113 is formed on an end surface of the sealing end 12b, and the diaphragm 51 is fixedly connected to a circumferential inner wall of the second housing 12 close to the fifth through hole 113 (or the sealing end 12b) (refer to fig. 2 and 3 for emphasis); correspondingly, the first controller 52 includes a base 52a and a heel 52b (refer to fig. 12 with emphasis).
The connecting heel 52b penetrates through the fifth through hole 113 and the end thereof is fixed to the diaphragm 51 (refer to fig. 1, 2, 3 and 12 for emphasis), so that the connecting heel 52b of the first controller 52 drives the diaphragm 51 to vibrate when reciprocating in the fifth through hole 113, and further drives the resonant cavity 100 to vibrate.
In a preferred embodiment of the present invention, the first housing 11 is an end cap, and includes a circular insertion plate having a first through hole 111 and a second through hole 112, and a flange extending in a direction of the second housing 12 along a circumferential direction of the circular insertion plate, that is, the insertion plate forms a groove with respect to the flange, the second housing 12 is a cylindrical structure, the open end 12a of the cylindrical second housing 12 is inserted into the groove, and the flange of the first housing 11 is fixedly connected (welded) to a circumferential outer surface of the open end 12a of the second housing 12.
In a preferred embodiment of the present invention, the first controller 52 is a vibration exciting controller capable of controlling the connecting heel 52b to reciprocate in the fifth through hole 113 according to a frequency control signal corresponding to the noise frequency and the vibration amplitude at the rotation speed transmitted by the ECU, it can be understood that the ECU can receive and analyze the frequency control signal to obtain the frequency control signal corresponding to the noise frequency and the vibration amplitude at the rotation speed and transmit the frequency control signal to the first controller 52, the first controller 52 controls the connecting heel 52b to reciprocate in the fifth through hole 113 according to the frequency control signal transmitted by the ECU, and the tail end of the connecting heel 52b is fixed to the vibration membrane 51, so the vibration membrane 51 and the resonant cavity 100 can be driven to vibrate.
The output sound pressure amplitude of the sound quality adjusting device of the exhaust system is adjustable, the sound frequency and the amplitude which need to be compensated can be adjusted timely according to the change of the rotating speed and the noise frequency, the noise under each rotating speed and noise frequency is compensated better, and the working frequency range of the sound quality adjusting device of the exhaust system is greatly enlarged; moreover, the exhaust system sound quality adjusting device can compensate sound and has a sound attenuation function, so that when the sound compensation is not needed, the exhaust system sound quality adjusting device can adjust the mode of the resonant cavity 100 (sound cavity), and the first controller 52 and the vibrating membrane 51 do not apply vibration excitation to the vibrating cavity to change the vibrating cavity into a sound attenuator, thereby reducing the noise with specific frequency.
The invention also provides an exhaust system sound quality adjusting method, which comprises a method for adjusting the sound quality of the tail pipe 20 by using the exhaust system sound quality adjusting device, and comprises the following steps:
when the ECU analyzes and judges that the tail pipe 20 does not need sound compensation according to the noise frequency and amplitude at the rotating speed, the sounding shell 10 and the connecting pipe 30 form a silencer, the ECU transmits a silencing frequency control command to the second controller 60, the second controller 60 controls the frequency modulator 40 to move up and down according to the silencing frequency control signal transmitted by the ECU, the length of the first inserting pipe 41 in the connecting pipe 30 is changed, and the silencing frequency of the resonant cavity 100 is adjusted;
the ECU analyzes and judges that when the tail pipe 20 needs sound compensation according to the noise frequency and the amplitude at the rotating speed, a target frequency and a target amplitude control signal corresponding to the sound compensation are obtained and transmitted to the first controller 52 and the second controller 60; the connecting heel 52b of the first controller 52 vibrates according to the target frequency and the target amplitude control signal transmitted by the ECU, drives the diaphragm 51 to vibrate, and drives the resonant cavity 100 to vibrate at the first vibration frequency; the second controller 60 controls the frequency modulator 40 to move up and down in the connection pipe 30 according to the target frequency and the target amplitude control signal, and adjusts the vibration frequency of the resonant cavity 100 to the first vibration frequency, at this time, the resonant cavity 100 resonates, the sounding housing 10 sounds and is transmitted to the tail pipe 20 through the connection pipe 30, so as to complete the sound compensation for the tail pipe 20, and achieve the desired sound expression effect.
The device and the method for adjusting the sound quality of the exhaust system are used for solving the problems that the sound pressure suddenly drops and is not pleasant enough when the exhaust noise of a fuel vehicle rises along with the rotating speed of an engine, improving the sound quality of the exhaust system and providing better exhaust sound for the whole vehicle.
In summary, the sound-producing housing including the resonant cavity therein is connected to the tail pipe through the connecting pipe, and the frequency modulator capable of moving up and down to adjust the vibration frequency of the resonant cavity is disposed at one end of the sound-producing housing close to the tail pipe, and the vibrating membrane capable of driving the resonant cavity to vibrate is disposed at the other end of the sound-producing housing, so as to achieve the functions of sound compensation and sound elimination.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides an exhaust system sound quality adjusting device, its characterized in that, including locate on tail pipe (20) and inside sound production casing (10), the intercommunication including resonant cavity (100) sound production casing (10) with connecting pipe (30) of tail pipe (20), in frequency modulator (40) of up-and-down motion in connecting pipe (30) and locate keep away from on sound production casing (10) the one end of tail pipe (20) is in order to drive vibrating device (50) of sound production casing (10) vibration, vibrating device (50) are including driving vibrating diaphragm (51) and the control of resonant cavity (100) vibration first controller (52) of vibrating diaphragm (51) vibration, vibrating diaphragm (51) rigid coupling in the circumference inner wall of sound production casing (10).
2. The acoustic quality control apparatus for an exhaust system according to claim 1, wherein the sound generating housing (10) comprises a first housing (11) and a second housing (12) assembled to the first housing (11) to form the resonant cavity (100), the first housing (11) is provided with a first through hole (111), one end of the connecting pipe (30) is fixedly connected to the first through hole (111), and the other end of the connecting pipe is fixedly connected to the tail pipe (20); the diaphragm (51) is fixed in the second housing (12).
3. The exhaust system acoustic quality adjusting apparatus according to claim 2, wherein the first housing (11) is further provided with a second through hole (112), and the frequency modulator (40) comprises a first insertion tube (41) of a hollow tube, a second insertion tube (43) of a solid tube, and a connection substrate (42) connecting the first insertion tube (41) and the second insertion tube (43) on the same horizontal plane; the sound quality adjusting device of the exhaust system further comprises a second controller (60) for controlling the frequency modulator (40) to move up and down, a third through hole (61) corresponding to the first through hole (111) and a fourth through hole (62) corresponding to the second through hole (112) are formed in the second controller (60), the first inserting pipe (41) penetrating through the first through hole (111) penetrates through the third through hole (61) and is inserted into the connecting pipe (30), the second inserting pipe (43) penetrating through the second through hole (112) penetrates through the fourth through hole (62), and the second controller (60) is fixedly connected to the first shell (11).
4. The exhaust system acoustic quality adjusting apparatus according to claim 3, characterized in that the length of the first insertion pipe (41) is equal to or less than the maximum length of the first through hole (111) to the connection pipe (30), and the diameter of the first insertion pipe (41) is larger than the diameter of the second insertion pipe (43).
5. The exhaust system acoustic quality adjustment apparatus according to claim 3, characterized in that a gasket (70) is further fitted between the second insertion pipe (42) and the second through hole (112).
6. The exhaust system sound quality adjusting apparatus according to claim 3 or 5, wherein the second controller (60) is an electromagnetic mechanical device or a hydraulic control system capable of changing the resonant frequency of the resonance chamber (100) by controlling the frequency modulator (40) to move up and down according to a frequency control signal corresponding to the noise frequency and vibration amplitude at the rotation speed transmitted from the ECU.
7. The exhaust system sound quality adjusting apparatus according to claim 6, wherein the second housing (12) includes an open end (12a) fixedly connected to the first housing (11) and a sealed end (12b) opposite to the open end (12a), an end surface of the sealed end (12b) is provided with a fifth through hole (113), the first controller (52) includes a base (52a) and a connecting heel (52b) extending from a center of the base (52a) to an outer side, the connecting heel (52b) passes through the fifth through hole (113) and has an end fixedly connected to the diaphragm (51).
8. The exhaust system sound quality adjusting apparatus according to claim 7, characterized in that the first controller (52) is a vibration exciting controller capable of controlling the connection lug (52b) to reciprocate in the fifth through hole (113) according to a frequency control signal corresponding to a noise frequency and a vibration amplitude at a rotational speed transmitted from the ECU.
9. The exhaust system sound quality control device according to claim 7, characterized in that the second housing (12) is a cylindrical structure, and the first housing (11) is an end cap fixedly attached to a circumferential outer surface of the open end (12a) of the second housing (12).
10. An exhaust system acoustic quality adjusting method, comprising a method of adjusting an acoustic quality of a tail pipe (20) with an exhaust system acoustic quality adjusting device:
when the ECU judges that the tail pipe (20) does not need sound compensation according to the noise frequency and the amplitude under the rotating speed, the sounding shell (10) and the connecting pipe (30) form a silencer, the ECU transmits a silencing frequency control command to the second controller (60), the second controller (60) controls the frequency modulator (40) to move up and down according to the silencing frequency control signal transmitted by the ECU, the length of the first inserting pipe (41) in the connecting pipe (30) is changed, and the silencing frequency of the resonant cavity (100) is adjusted;
when the ECU judges that the tail pipe (20) needs sound compensation according to the noise frequency and the amplitude under the rotating speed, a target frequency and a target amplitude control signal corresponding to the sound compensation are transmitted to a first controller (52) and a second controller (60), the first controller (52) vibrates according to the control signal transmitted by the ECU to drive a vibrating membrane (51) to vibrate, a resonant cavity (100) is excited to vibrate at a first vibration frequency, the second controller (60) controls a frequency modulator (40) to move up and down in a connecting pipe (30) according to the control signal to adjust the vibration frequency of the resonant cavity (100) to the first vibration frequency, the resonant cavity (100) resonates and sounds, the sound is transmitted to the tail pipe (20) through the connecting pipe (30), and the sound compensation of the tail pipe (20) is completed.
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| CN201910223476.4A CN111720189B (en) | 2019-03-22 | 2019-03-22 | Exhaust system sound quality adjusting device and method |
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| CN201910223476.4A CN111720189B (en) | 2019-03-22 | 2019-03-22 | Exhaust system sound quality adjusting device and method |
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| CN111720189B CN111720189B (en) | 2024-01-23 |
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| EP0586831A2 (en) * | 1992-08-13 | 1994-03-16 | Bayerische Motoren Werke Aktiengesellschaft | Sound absorption method for motor vehicles |
| EP0916817A2 (en) * | 1997-11-18 | 1999-05-19 | LEISTRITZ AG & CO. Abgastechnik | Active silencer |
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