CN111720189B - Exhaust system sound quality adjusting device and method - Google Patents
Exhaust system sound quality adjusting device and method Download PDFInfo
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- CN111720189B CN111720189B CN201910223476.4A CN201910223476A CN111720189B CN 111720189 B CN111720189 B CN 111720189B CN 201910223476 A CN201910223476 A CN 201910223476A CN 111720189 B CN111720189 B CN 111720189B
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- 230000037431 insertion Effects 0.000 claims description 42
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- 230000005284 excitation Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 230000008030 elimination Effects 0.000 claims 3
- 238000003379 elimination reaction Methods 0.000 claims 3
- 239000000446 fuel Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000030279 gene silencing Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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Classifications
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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
Abstract
The invention provides an exhaust system sound quality adjusting device which comprises a sound producing shell, a connecting pipe, a frequency modulator and a vibrating device, wherein the sound producing shell is arranged on an exhaust tail pipe, a resonant cavity is formed in the sound producing shell, the connecting pipe is communicated with the sound producing shell, 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 sound producing shell and is used for driving the sound producing shell to vibrate, the vibrating device comprises a vibrating membrane capable of driving the resonant cavity to vibrate and a first controller for controlling the vibrating membrane to vibrate, and the vibrating membrane is fixedly connected to the circumferential inner wall of the sound producing shell. The invention also relates to a method for adjusting the sound quality of the exhaust system, which is used for solving the problems that the sound pressure suddenly drops and the exhaust noise of the fuel vehicle is unpleasant when the rotation speed of the engine rises, 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 an exhaust system sound quality adjusting device and method.
Background
Along with the improvement of the living standard of people, the requirements of people on the whole car are changed from original riding instead of walking tools to comfortable household necessities, so that the requirements on the sound quality of the whole car are improved except that the dynamic requirements on the car type are strict, and the noise optimization of the whole car in the running and accelerating processes is particularly important. The exhaust system is used as an important component of the automobile, and the exhaust system discharges exhaust gas and brings combustion noise to the tail of the automobile, so that high-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 acoustic cavity mode of the passenger cabin is most likely to be excited to cause the resonance of the acoustic cavity of the passenger cabin, so that the NVH of the whole automobile is seriously affected.
At present, most vehicle models are not provided with exhaust system sound quality adjusting devices, and even if some vehicle models are provided with electromagnetic valves, the electromagnetic valves mainly reduce back pressure and flow noise and cannot compensate sound loss at certain rotating speeds; some vehicle types use front-end exhaust pulsation as excitation and utilize resonant cavity resonance to compensate exhaust sound, but the sound quality compensation device can only compensate sound at a certain rotating speed or frequency, can not change along with the change of the rotating speed or frequency to compensate sound at different frequencies, and can not adjust the amplitude of the sound, so that the sound quality adjustment is limited.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an exhaust system sound quality adjusting apparatus and method capable of improving the noise quality of the entire vehicle.
The invention provides an exhaust system sound quality adjusting device which comprises a sound producing shell, a connecting pipe, a frequency modulator and a vibrating device, wherein the sound producing shell is arranged on an exhaust tail pipe, a resonant cavity is arranged in the sound producing shell, the connecting pipe is communicated with the sound producing 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 sound producing shell and is used for driving the resonant cavity to vibrate, the vibrating device comprises a vibrating membrane and a first controller, the vibrating membrane can be used for driving 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 sound producing shell.
Further, the sound-producing shell comprises a first shell and a second shell 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.
Further, the first shell is also provided with a second through hole, and the frequency modulator comprises a first insertion tube in a hollow tube form, a second insertion tube in a solid tube form and a connecting substrate for connecting the first insertion tube and the second insertion tube on the same horizontal plane; the exhaust system sound quality adjusting device further comprises a second controller for controlling the frequency modulator to move up and down, a third through hole corresponding to the first through hole and a fourth through hole corresponding to the second through hole are formed in the second controller, the first insertion pipe penetrating through the first through hole penetrates through the third through hole and is inserted into the connecting pipe, the second insertion pipe penetrating through the second through hole penetrates through the fourth through hole, and the second controller is fixedly connected to the first shell.
Further, the length of the first insertion tube is smaller than or equal to the maximum length of the first through hole to the connecting tube, and the diameter of the first insertion tube is larger than the diameter of the second insertion tube.
Further, a gasket is further provided between the second insertion tube and the second through hole.
Further, the second controller is an electromagnetic mechanical device or a hydraulic control system which can control the up-and-down motion of the frequency modulator to change the resonance 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 at the rotating speed.
Further, the second casing includes 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 includes the base and by the outside connection heel that forms that extends in center of base, connect the heel pass the fifth through-hole and terminal rigid coupling in the vibrating diaphragm.
Further, the first controller is a vibration excitation controller capable of controlling the connection of the first controller to reciprocate 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 at 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 a method for adjusting the sound quality of the exhaust system, which comprises the following steps of adjusting the sound quality of the tail pipe by using the device for adjusting the sound quality of the exhaust system:
when the ECU judges that the tail pipe does not need sound compensation according to the noise frequency and amplitude value at the rotating speed, the sound-producing shell and the connecting pipe form a muffler, the ECU transmits a muffling frequency control command to the second controller, and the second controller controls the frequency modulator to move up and down according to the muffling frequency control signal transmitted by the ECU, so that the length of the first insertion pipe in the connecting pipe is changed, and the muffling frequency of the resonant cavity is adjusted;
when the ECU judges that the tail pipe needs to be subjected to sound compensation according to the noise frequency and the amplitude value under the rotating speed, a target frequency and a target amplitude control signal corresponding to the sound compensation are transmitted to a first controller and a second controller, the first controller vibrates according to the control signal transmitted by the ECU to drive a vibrating membrane to vibrate so as to excite a resonant cavity to vibrate at a first vibration frequency, the second controller controls a frequency modulator to move up and down in a connecting pipe according to the control signal, the vibration frequency of the resonant cavity is adjusted to the first vibration frequency, the resonant cavity resonates and sounds, and the sound is transmitted to the tail pipe through the connecting pipe to finish the sound compensation of the tail pipe.
In summary, the sound-producing shell with the resonant cavity inside is connected to the tail pipe through the connecting pipe, the frequency modulator which can move up and down to adjust the vibration frequency of the resonant cavity is arranged at one end, close to the tail pipe, of the sound-producing shell, the vibrating membrane which can drive the resonant cavity to vibrate is arranged at the other end, the functions of compensating sound and silencing are achieved, the problems that the sound pressure suddenly drops and is unpleasant when the exhaust noise of the fuel vehicle rises along with the rising of the engine speed are solved, and the sound quality of an exhaust system is improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an apparatus and method for adjusting the sound quality of an exhaust system according to the present invention;
FIG. 2 is a schematic cross-sectional view taken along line 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 the area I in FIG. 3;
FIG. 5 is a schematic view of a first housing of the sound housing of FIG. 1;
FIG. 6 is a schematic diagram of a second housing of the sound emitting housing of FIG. 1;
FIG. 7 is a schematic view of another view angle structure of FIG. 6;
FIG. 8 is a schematic view of the connecting tube of 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 motion of the frequency modulator of FIG. 1;
FIG. 11 is a schematic view of the gasket of FIG. 1 installed between a second insertion tube and a second through hole;
FIG. 12 is a schematic diagram of a first controller for controlling vibration of the diaphragm of FIG. 1;
fig. 13 is a schematic view of the structure of the diaphragm in fig. 1.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention to achieve the preset purpose, the following detailed description of the present invention is given with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 1 to 13, the present invention provides an exhaust system sound quality adjusting device, which comprises a sound producing housing 10 disposed on a tail pipe 20 and having a resonant cavity 100 therein, a connecting pipe 30 communicating the sound producing housing 10 and the tail pipe 20, a frequency modulator 40 moving up and down in the connecting pipe 30, and a vibration device 50 disposed on one end of the sound producing housing 10 far from the tail pipe 20 to drive the resonant cavity 100 to vibrate.
Referring to fig. 1 to 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, thereby continuously changing the vibration frequency of the resonant cavity 100 and increasing the operating frequency range of the sound quality adjusting device.
Meanwhile, the vibration device 50 comprises a vibration membrane 51 capable of driving the resonant cavity 100 to vibrate and a first controller 52 for controlling the vibration membrane 51 to vibrate, the vibration membrane 51 is fixedly connected to the circumferential inner wall of the sounding housing 10, and when the first controller 52 controls the vibration membrane 51 to vibrate, the vibration of the resonant cavity 100 (acoustic cavity) is driven, so that the control is accurate and the response is timely, and the purpose of compensating or silencing the sound of the tail pipe 20 is achieved; in a preferred embodiment of the present invention, the diaphragm 51 is a concave circular diaphragm, and 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 to 7 together, the sound generating 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 again to fig. 1 and 8, 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 connection pipe 30 are welded to the first through hole 111 and the tail pipe 20 respectively, and the end of the connection 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 connection pipe 30, so that when the sounding housing 10 sounds, sound is transmitted to the tail pipe 20 through the connection pipe 30.
As shown in fig. 9, in the present invention, the frequency modulator 40 includes a first insertion tube 41 in the form of a hollow tube, a second insertion tube 43 in the form 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, where 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 device further comprises a second controller 60 for controlling the up-and-down movement of the frequency modulator 40, and 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 arranged on the second controller 60.
The first insertion tube 41 passing through the first through hole 111 passes through the third through hole 61 and is inserted into the connecting 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 tail end of the first shell 11, the length of the first insertion tube 41 is smaller than or equal to the maximum length from the first through hole 111 to the connecting tube 30, and the diameter of the first insertion tube 41 is larger than the diameter of the second insertion tube 43, so that the first insertion tube 41 can move up and down in an adjusting hole formed by the first through hole 111, the third through hole 61 and the connecting tube 30, different vibration frequencies of the resonant cavity 100 can be realized when the lengths of the first insertion tube 41 in the adjusting hole are different, and the sensitivity and the accuracy of the resonant frequency adjustment of the resonant cavity can be ensured.
Referring again to fig. 9, in a preferred embodiment provided by the present invention, the first insertion tube 41 and the second insertion tube 43 are connected to both ends of the connection substrate 42 perpendicularly; meanwhile, the second controller 60 is an electromagnetic mechanical device or a hydraulic control system capable of controlling the up-and-down motion of the frequency modulator 40 according to a frequency control signal corresponding to the noise frequency and the vibration amplitude at the rotation speed transmitted by the ECU to change the length of the first insertion tube 41 in the connection tube 30 and finally realize the adjustment of the resonant frequency of the resonant cavity 100, and it is understood that the frequency modulator 40 moves up-and-down under the control of the second controller 60 to change the frequency of the resonant cavity 100 in a manner of changing the length thereof and adjust the vibration frequency of the resonant cavity 100.
As shown in fig. 11, in the present invention, a sealing pad 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 pad 70 is a steel wool graphite pad with better durability, so as to ensure the resonance 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 open end 12a fixedly connected to the first housing 11 and a sealed end 12b opposite to the open end 12a, a fifth through hole 113 is provided on an end surface of the sealed end 12b, and the diaphragm 51 is fixedly connected to a circumferential inner wall of the second housing 12 near the fifth through hole 113 (or the sealed end 12 b) (refer to fig. 2 and 3 with emphasis); correspondingly, the first controller 52 includes a base 52a and a heel 52b (refer to fig. 12 with emphasis).
The connecting heel 52b passes through the fifth through hole 113 and the end is fixedly connected to the vibrating membrane 51 (refer to fig. 1, 2, 3 and 12 for focus), so that the connecting heel 52b of the first controller 52 drives the vibrating membrane 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 cover, and includes a circular insert plate provided with a first through hole 111 and a second through hole 112, and a flange extending in a circumferential direction of the circular insert plate in a direction of the second housing 12, that is, the insert plate forms a groove with respect to the flange, while the second housing 12 is in 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 excitation controller capable of controlling the connection 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, and it is understood that the ECU can receive and analyze 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, and the first controller 52 controls the connection heel 52b to reciprocate in the fifth through hole 113 according to the frequency control signal transmitted by the ECU, and the end of the connection heel 52b is fixedly connected to the vibration membrane 51, so that the vibration membrane 51 and the resonant cavity 100 can be driven to vibrate.
The output sound pressure amplitude of the exhaust system sound quality adjusting device provided by the invention is adjustable, the sound frequency and amplitude to be compensated can be timely adjusted according to the change of the rotating speed and the noise frequency, the noise under each rotating speed and the noise frequency is better compensated, and the working frequency range of the exhaust system sound quality adjusting device is greatly improved; the exhaust system sound quality adjusting device can adjust the mode of the resonant cavity 100 (acoustic cavity) when the sound compensation is not needed, and does not apply vibration excitation to the vibration cavity through the first controller 52 and the vibration film 51 to change the vibration cavity into a muffler, so that the noise with specific frequency is reduced.
The present invention also provides a method for adjusting the sound quality of an exhaust system, comprising the steps of adjusting the sound quality of a tail pipe 20 by using an exhaust system sound quality adjusting device:
when the ECU judges that the tail pipe 20 does not need sound compensation according to the noise frequency and amplitude analysis at the rotating speed, the sound-producing shell 10 and the connecting pipe 30 form a muffler, the ECU transmits a muffling 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 muffling frequency control signal transmitted by the ECU, the length of the first insertion pipe 41 in the connecting pipe 30 is changed, and the muffling frequency of the resonant cavity 100 is adjusted;
the ECU acquires a target frequency and a target amplitude control signal corresponding to the sound compensation when the tail pipe 20 needs the sound compensation according to the noise frequency and the amplitude analysis at the rotation speed, and transmits the signals to the first controller 52 and the second controller 60; the connection piece 52b of the first controller 52 vibrates according to the target frequency and the target amplitude control signal transmitted by the ECU, drives the vibration film 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, adjusts the vibration frequency of the resonant cavity 100 to the first vibration frequency, and at this time, the resonant cavity 100 resonates, and the sounding housing 10 sounds and is transmitted to the tail pipe 20 through the connection pipe 30, thereby completing the sound compensation of the tail pipe 20 and achieving the desired sound expression effect.
The exhaust system sound quality adjusting device and method provided by the invention 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 rotation speed of the engine, improving the sound quality of the exhaust system and providing better exhaust sound for the whole vehicle.
In summary, according to the invention, 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 arranged 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 arranged at the other end of the sound-producing housing, so that the functions of compensating sound and silencing are realized.
The present invention is not limited to the above embodiments, but is capable of modification and variation in all aspects, including those of ordinary skill in the art, without departing from the spirit and scope of the present invention.
Claims (8)
1. The sound quality adjusting device of the exhaust system is characterized by comprising a sound producing shell (10) which is arranged on an exhaust tail pipe (20) and internally comprises a resonant cavity (100), a connecting pipe (30) which is communicated with the sound producing shell (10) and the exhaust tail pipe (20), a frequency modulator (40) which moves up and down in the connecting pipe (30), a second controller (60) which controls the frequency modulator (40) to move up and down, and a vibrating device (50) which is arranged on one end, far away from the exhaust tail pipe (20), of the sound producing shell (10) so as to drive the resonant cavity (100) to vibrate, wherein the vibrating device (50) comprises a vibrating membrane (51) which can drive the resonant cavity (100) to vibrate and a first controller (52) which controls the vibrating membrane (51) to vibrate, and the vibrating membrane (51) is fixedly connected to the circumferential inner wall of the sound producing shell (10);
the sound-producing shell (10) comprises a first shell (11) and a second shell (12) assembled on the first shell (11) to form the resonant cavity (100), a first through hole (111) is formed in the first shell (11), one end of the connecting pipe (30) is fixedly connected with the first through hole (111), and the other end of the connecting pipe is fixedly connected with the tail pipe (20); the diaphragm (51) is fixed in the second housing (12);
the first shell (11) is also provided with a second through hole (112), and the frequency modulator (40) comprises a first insertion tube (41) in a hollow tube form, a second insertion tube (43) in a solid tube form and a connecting substrate (42) which connects the first insertion tube (41) and the second insertion tube (43) on the same horizontal plane; 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 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 insertion 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 outer surface of the tail end of the first shell (11).
2. The exhaust system sound quality adjusting apparatus according to claim 1, wherein the length of the first insertion tube (41) is equal to or less than the maximum length of the first through hole (111) to the connection tube (30), and the diameter of the first insertion tube (41) is larger than the diameter of the second insertion tube (43).
3. The exhaust system sound quality adjusting device according to claim 1, characterized in that a gasket (70) is also fitted between the second insertion tube (43) and the second through hole (112).
4. An exhaust system sound quality adjusting apparatus according to claim 1 or 3, wherein the second controller (60) is an electromagnetic mechanical device or a hydraulic control system capable of controlling the up-and-down movement of the frequency modulator (40) to change the resonance frequency of the resonance chamber (100) according to a frequency control signal corresponding to the noise frequency and the vibration amplitude at the rotation speed transmitted by the ECU.
5. An exhaust system sound quality adjusting device according to claim 3, characterized in that the second housing (12) comprises an open end (12 a) fixedly connected to the first housing (11) and a sealed end (12 b) opposite to the open end (12 a), a fifth through hole (113) is provided in an end face of the sealed end (12 b), the first controller (52) comprises a base (52 a) and a connection heel (52 b) extending outward from a center of the base (52 a), and the connection heel (52 b) passes through the fifth through hole (113) and is fixedly connected to the diaphragm (51) at an end.
6. The exhaust system sound quality adjusting apparatus according to claim 5, wherein the first controller (52) is a vibration excitation controller capable of controlling the connection pad (52 b) to reciprocate in the fifth through hole (113) in accordance with a frequency control signal corresponding to a noise frequency and a vibration amplitude at a rotational speed transmitted from the ECU.
7. The exhaust system sound quality adjusting apparatus according to claim 5, wherein the second housing (12) is a cylindrical structure, and the first housing (11) is an end cap fixedly connected to a circumferential outer surface of an open end (12 a) of the second housing (12).
8. An exhaust system sound quality adjusting method using the exhaust system sound quality adjusting apparatus according to claim 1, comprising:
when the ECU judges that the tail pipe (20) does not need sound compensation according to the noise frequency and the amplitude value at the rotating speed, the sounding housing (10) and the connecting pipe (30) form a muffler, the ECU transmits a noise elimination 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 noise elimination frequency control signal transmitted by the ECU, the length of the frequency modulator (40) in the connecting pipe (30) is changed, and the noise elimination frequency of the resonant cavity (100) is adjusted;
when the ECU judges that the tail pipe (20) needs to be subjected to 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 transmitted to the first controller (52) and the second controller (60), the first controller (52) vibrates according to the control signal transmitted by the ECU, the vibrating membrane (51) is driven to vibrate, the resonant cavity (100) is excited to vibrate at a first vibration frequency, the second controller (60) controls the frequency modulator (40) to move up and down in the connecting pipe (30) according to the control signal, the vibration frequency of the resonant cavity (100) is adjusted to the first vibration frequency, the resonant cavity (100) resonates and sounds, and the sound is transmitted to the tail pipe (20) through the connecting pipe (30), so that the sound compensation on the tail pipe (20) is completed.
Priority Applications (1)
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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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| CN111720189A CN111720189A (en) | 2020-09-29 |
| CN111720189B true CN111720189B (en) | 2024-01-23 |
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