CN110080856B

CN110080856B - Noise adjusting device and have its car

Info

Publication number: CN110080856B
Application number: CN201910351568.0A
Authority: CN
Inventors: 何文运; 田新伟; 姚敏; 胡亮
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2021-01-19
Anticipated expiration: 2039-04-28
Also published as: CN110080856A

Abstract

The invention belongs to the technical field of automobile silencing, and particularly relates to a noise adjusting device and an automobile with the same. The noise adjusting device includes: a housing having an air inlet and an air outlet; at least one expansion cavity, which is arranged inside the shell and communicated with the air inlet; at least one resonant cavity disposed inside the housing; the at least one resistive cavity is arranged inside the shell and communicated with the exhaust port, and the at least one resistive cavity can be also communicated with the at least one expansion cavity; an intermediate tube for communicating the at least one resonant cavity and the at least one expansion cavity. The invention can improve the sound quality of the automobile in the full rotating speed range of the engine by matching the expansion cavity, the resonant cavity and the resistive cavity for noise reduction, and meets the individual requirements of consumers on dynamic feeling or motion feeling of exhaust noise and the like.

Description

Noise adjusting device and have its car

Technical Field

The invention belongs to the technical field of automobile noise reduction, and particularly relates to a noise adjusting device and an automobile with the same.

Background

Sound quality refers to the suitability of sound within a particular technical goal or task connotation. The sound quality of an automobile is the sound of an automobile product meeting the requirements of people and the environment. Noise control not only passively reduces the sound pressure level of the noise, but also enables the noise of the product to be heard not only quietly, but also as pleasant as possible, even adjusting the noise to an ideal state, with individual unique sound characteristics for different products, according to the subjective perception of the customer, by means of reasonable and effective measures. Improving the acoustic quality of automobiles and increasing the subjective satisfaction of consumers with noise have been the focus of attention of automobile manufacturers and engineers.

Exhaust noise is one of the main noise sources of an automobile, and its acoustic quality has an important influence on the acoustic quality of the entire automobile, so that the exhaust acoustic quality must be strictly controlled. In addition, the exhaust sound quality control not only needs to reduce the sound pressure level of the noise, but also needs to be capable of adjusting the frequency characteristic of the noise, particularly effectively controlling the low-frequency order characteristic in the exhaust noise, and meeting the personalized requirements of consumers on the quality of the whole vehicle sound. In the prior art, the sound characteristics under two modes of high speed and low speed are generally realized by controlling the on-off of a valve. However, there are multiple frequency characteristics of exhaust noise as engine speed changes, and only two modes are insufficient to effectively control exhaust sound quality; in addition, the prior art cannot realize the adjustment of the energy distribution of each order of exhaust noise.

Disclosure of Invention

The invention aims to at least solve the problem that the existing automobile silencer is difficult to effectively control the quality of exhaust sound. The purpose is realized by the following technical scheme:

a first aspect of the present invention provides a noise adjusting apparatus, comprising:

a housing having an air inlet and an air outlet;

at least one expansion cavity, which is arranged inside the shell and communicated with the air inlet;

at least one resonant cavity disposed inside the housing;

the at least one resistive cavity is arranged inside the shell and communicated with the exhaust port, and the at least one resistive cavity can be also communicated with the at least one expansion cavity;

an intermediate tube for communicating the at least one resonant cavity and the at least one expansion cavity.

The noise adjusting device provided by the invention can adjust the energy ratio of the middle frequency band through the at least one expansion cavity, eliminate the middle frequency noise, absorb sound and eliminate the high frequency noise through the at least one resistive cavity, so that the order noise is more prominent, adjust the silencing frequency of the resonant cavity, adjust the energy ratio of each order of the exhaust noise and reduce the noise of low frequency components by adjusting the length size of the middle pipe inserted into the at least one resonant cavity; the noise adjusting device enables the noise of a product to be heard quietly and to be pleasant as much as possible through the matched noise elimination of the plurality of cavities such as the expansion cavity, the resonant cavity, the resistive cavity and the like, and even adjusts the noise to an ideal state, so that different products have respective unique sound characteristics, the sound quality of an automobile is improved within the full rotating speed range of an engine, and the individual requirements of consumers on the dynamic sense or the motion sense of exhaust noise and the like are met.

In addition, according to the noise adjusting device provided by the invention, the following additional technical characteristics can be provided:

in some embodiments of the present invention, the at least one expansion chamber, the at least one resonant chamber, and the at least one resistive chamber are formed by being separated by a partition disposed within the housing.

In some embodiments of the present invention, the number of the at least one expansion cavity is two, and the at least one expansion cavity includes a first expansion cavity and a second expansion cavity which are sequentially arranged in a communication manner along an exhaust movement direction, an air intake inner tube is arranged inside the first expansion cavity, one end of the air intake inner tube is communicated with the air inlet, the other end of the air intake inner tube is communicated with the second expansion cavity, and a plurality of first through holes are uniformly distributed on a side wall of the air intake inner tube along a circumferential direction.

In some embodiments of the present invention, the at least one resonant cavity is three in number, and includes a first resonant cavity and a second resonant cavity respectively communicating with the first expansion cavity, and a third resonant cavity communicating with the second expansion cavity, where the first resonant cavity communicates with the first expansion cavity through a first intermediate pipe, the second resonant cavity communicates with the first expansion cavity through a second intermediate pipe, and the third resonant cavity communicates with the second expansion cavity through a third intermediate pipe.

In some embodiments of the invention, the number of the at least one resistive cavity is one.

In some embodiments of the present invention, the middle pipe is a telescopic sleeve, the telescopic sleeve includes an outer cylinder and an inner cylinder coaxially sleeved in the outer cylinder, and the inner cylinder can linearly move back and forth along an axial direction of the outer cylinder to extend out of or into the outer cylinder, so as to adjust the length of the middle pipe.

In some embodiments of the present invention, an exhaust inner tube is disposed inside the resistive cavity, one end of the exhaust inner tube is communicated with the exhaust port, the other end of the exhaust inner tube is communicated with the second expansion cavity, and a plurality of second through holes are uniformly distributed on a side wall of the exhaust inner tube along a circumferential direction.

In some embodiments of the present invention, the noise adjusting device further comprises a controller and an actuator, the controller is electrically connected to the actuator, and the controller can control the actuator to adjust the length of the middle pipe inserted into the interior of the at least one resonant cavity.

In some embodiments of the present invention, a resistive material for absorbing high-band noise is disposed within the resistive cavity.

A second aspect of the invention provides a motor vehicle having the noise control device described above, the air inlet of the noise control device being connected to an exhaust manifold of an engine of the motor vehicle.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:

fig. 1 schematically shows a schematic configuration of a noise adjusting apparatus according to an embodiment of the present invention;

the reference numerals in the drawings denote the following:

1-shell, 101-inlet, 102-outlet;

21-a first dilatation lumen, 22-a second dilatation lumen;

31-a first resonant cavity, 32-a second resonant cavity, 33-a third resonant cavity;

4-a resistive cavity;

51-a first partition plate, 52-a second partition plate, 53-a third partition plate, 54-a fourth partition plate, 55-a fifth partition plate;

61-first intermediate pipe, 62-second intermediate pipe, 63-third intermediate pipe;

7-a controller; 8-an actuator;

20-air inlet pipe, 30-air outlet pipe, 201-air inlet inner pipe and 301-air outlet inner pipe.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The exhaust noise is the most dominant noise source in the engine noise, and the noise is generally 10-15 dB (A) higher than the whole engine noise. The engine exhaust belongs to high-temperature (800-1000D) and high-pressure gas. The exhaust process is generally divided into two stages, a free exhaust stage and a forced exhaust stage, in which engine exhaust gas is flushed out at a high speed from an exhaust valve, enters a muffler device along an exhaust manifold, and finally is discharged into the atmosphere from a tail pipe, and in this process, broadband exhaust noise is generated.

The exhaust sound quality has an important influence on the sound quality of the vehicle. The exhaust noise of the automobile contains a large amount of order information, the energy is mainly distributed in the ignition order and the harmonic order of the engine (for example, the ignition and harmonic order components of a four-cylinder four-stroke engine are 2, 4 and 6 … … orders, and the ignition and harmonic order components of a six-cylinder four-stroke engine are 3, 6 and 9 … … orders), and the frequencies corresponding to the ignition order and the harmonic order can be correspondingly changed along with the change of the rotating speed of the engine. The exhaust sound quality can be quantitatively described as follows:

SQ＝α×Order+β×Tonality+λ×SPL+γ×Speed+τ

in the formula, alpha, beta, lambda, gamma and tau are coefficient terms; order denotes the major Order component of exhaust noise; tonality denotes the tone schedule of exhaust noise; SPL represents the overall sound pressure level of the exhaust noise; speed represents the engine Speed. According to the above formula, the essence of the exhaust sound quality control is to control the energy distribution of the exhaust noise in the low, medium, and high frequency bands, and the energy distribution of the order components mainly distributed in the low frequency band.

Fig. 1 is a schematic structural diagram of a noise control device according to an embodiment of the present invention (the direction of arrows in the figure is an exhaust flow direction). As shown in fig. 1, according to an embodiment of the present invention, a noise adjusting device is provided, which includes a housing 1, and at least one expansion chamber, at least one resonant chamber, at least one resistive chamber 4 and an intermediate pipe, which are disposed in the housing 1, wherein the housing 1 has an air inlet 101 and an air outlet 102, the at least one expansion chamber is communicated with the air inlet 101, the at least one resistive chamber 4 is communicated with the air outlet 102, the at least one resistive chamber 4 can also be communicated with the at least one expansion chamber, and the intermediate pipe is used for communicating the at least one resonant chamber and the at least one expansion chamber.

The noise adjusting device provided by the invention can adjust the energy ratio of the middle frequency band through the at least one expansion cavity, eliminate the middle frequency noise, absorb sound through the at least one resistive cavity and eliminate the high frequency noise, so that the order noise is more prominent; the noise adjusting device enables the noise of a product to be heard quietly and to be pleasant as much as possible through the matched noise elimination of the plurality of cavities such as the expansion cavity, the resonant cavity, the resistive cavity and the like, and even adjusts the noise to an ideal state, so that different products have respective unique sound characteristics, the sound quality of an automobile is improved within the full rotating speed range of an engine, and the individual requirements of consumers on the dynamic sense or the motion sense of exhaust noise and the like are met. In addition, the plurality of chambers are arranged, so that the air flow path during air exhaust is increased, the flow speed of air flow is slowed down, air is slowly exhausted, and the air exhaust and noise reduction effects are further optimized.

In some embodiments of the present invention, the number of the at least one expansion cavity is two, and the at least one expansion cavity includes a first expansion cavity 21 and a second expansion cavity 22 sequentially arranged in a communication manner along the exhaust movement direction, an air inlet inner tube 201 is disposed inside the first expansion cavity 21, one end of the air inlet inner tube 201 is communicated with the air inlet 101, the other end of the air inlet inner tube 201 is communicated with the second expansion cavity 22, a plurality of first through holes are uniformly distributed on a side wall of the air inlet inner tube 201 along the circumferential direction, and the air flow in the air inlet inner tube 201 can enter the first expansion cavity 21 through the first through holes.

The part (air inlet inner pipe 201) of the air inlet pipe 20 located in the first expansion cavity 21 is provided with a first perforation to form a micro-perforation noise reduction structure, when exhaust airflow enters the noise adjusting device, the airflow enters the first expansion cavity 21 along with the air inlet pipe 20 and enters the first expansion cavity 21 through the first perforation on the side wall of the air inlet inner pipe 201, the airflow enters the first expansion cavity 21 and then diffuses, the energy of the air is consumed, and noise is reduced.

Because the section of the first expansion cavity 21 is larger than that of the air inlet pipe 20, the characteristics of the sound waves are changed due to the sudden change of the section of the air flow, a part of incident waves are reflected to the original sound source, the outward transmission of the sound waves is restrained, the noise elimination effect is achieved, and the noise is attenuated to a certain degree. Theoretically, the more pronounced the abrupt change in the cross section is, the greater the noise expansion ratio is, and the more pronounced the sound attenuation effect is, and therefore, the provision of the second expansion chamber 22 having a larger cross-sectional area downstream of the first expansion chamber 21 in the gas flow direction enables further sound attenuation. The different length and width of the first expansion cavity 21 and the second expansion cavity 22 make the main silencing frequency sections of the first expansion cavity and the second expansion cavity different, so that a more broadband silencing effect can be generated, and medium-frequency noise can be eliminated through the gradual silencing of the first expansion cavity 21 and the second expansion cavity 22. In addition, the larger volumes of the first expansion cavity 21 and the second expansion cavity 22 can reduce the flow velocity of the airflow, weaken the pulsation of the airflow and play a certain role in stabilizing the pressure.

The number of the at least one resonant cavity is three, the resonant cavities are helmholtz resonant cavities and include a first resonant cavity 31 and a second resonant cavity 32 which are respectively communicated with the first expansion cavity 21, and a third resonant cavity 33 which is communicated with the second expansion cavity 22, the first resonant cavity 31 is communicated with the first expansion cavity 21 through a first middle pipe 61, the second resonant cavity 32 is communicated with the first expansion cavity 21 through a second middle pipe 62, and the third resonant cavity 33 is communicated with the second expansion cavity 22 through a third middle pipe 63. The noise adjusting device adopts resonance, interference noise with different frequencies can be generated in the resonant cavity, interference is caused to exhaust noise, and the noise reduction effect is improved. After the noise enters the resonant cavity from the middle tube, the noise of the middle frequency and the low frequency is further weakened, and finally the noise is reduced to a lower level. In addition, in the embodiment, the resonant cavity is arranged at one side of the different expansion cavities, so that noise can be eliminated in a wide frequency range.

The middle pipes are telescopic sleeves and comprise outer cylinders and inner cylinders coaxially sleeved in the outer cylinders, two ends of each outer cylinder respectively extend into the resonant cavity and the expansion cavity, and the inner cylinders can linearly move in a reciprocating mode along the axial direction of the outer cylinders to extend out of or into the outer cylinders, so that the length of the middle pipes is adjusted.

The acoustic frequencies of the helmholtz resonator are,

in the formula, c is sound velocity, S is the sectional area of a Helmholtz resonant cavity pipeline, V is the volume of the Helmholtz resonant cavity, and L is the length of the Helmholtz resonant cavity pipeline.

According to the above formula, at S, V fixed, the length L of the Helmholtz cavity tube is only needed to adjust the muffling frequency.

In this embodiment, by adjusting the lengths of the first intermediate pipe 61, the second intermediate pipe 62, and the second intermediate pipe 63, the muffling frequency of the helmholtz resonator corresponding to the intermediate pipes can be adjusted, and the energy ratios of different orders of exhaust noise can be adjusted to adapt to the change of the engine speed and improve the sound quality of the automobile.

The number of at least one resistive cavity 4 is one, the inside of resistive cavity 4 is equipped with exhaust inner tube 301, the one end and the gas vent 102 intercommunication of exhaust inner tube 301, the other end and the second of exhaust inner tube 301 expand the chamber 22 intercommunication, it has a plurality of second perforation to follow the circumference direction equipartition on the lateral wall of exhaust inner tube 301 for the air current in the exhaust inner tube 301 can pass through the second perforation and gets into in the resistive cavity 4.

The resistive cavity 4 is filled with a resistive material for absorbing high-frequency band noise, and when sound waves pass through the resistive material, the high-frequency noise is absorbed by the resistive material and converted into heat energy, so that the high-frequency noise is reduced. Since the noise propagating along the pipe attenuates with distance, disposing the resistive chamber 4 near the exhaust port 102 can improve the high-frequency sound-deadening effect.

In some embodiments of the present invention, the at least one expansion chamber, the at least one resonant chamber, and the at least one resistive chamber are separated by a partition disposed within the housing 1.

In this embodiment, the first expansion cavity 21, the second expansion cavity 22 and the resistive cavity 4 are formed by separating a first vertical partition plate 51 and a second vertical partition plate 52 which are sequentially arranged along the axial direction of the housing 1 at intervals, and the first partition plate 51 and the second partition plate 52 are clamped on the inner wall of the housing 1 and are matched with the cross-sectional dimension of the housing 1. The volume of the first expansion cavity 21 and the volume of the second expansion cavity 22 can be adjusted by adjusting the axial size of the first partition plate 51 and the second partition plate 52, so that the energy ratio of the middle frequency band can be adjusted.

In the first expansion cavity 21, a resonant cavity is formed by dividing the first expansion cavity 21 by a horizontally arranged third partition plate 53, the resonant cavity is divided into a first resonant cavity 31 and a second resonant cavity 32 by a vertically arranged fourth partition plate 54, a first middle pipe 61 and a second middle pipe 62 are both fixed on the third partition plate 53, two ends of the first middle pipe 61 are respectively communicated with the first expansion cavity 21 and the first resonant cavity 31, and two ends of the second middle pipe 62 are respectively communicated with the first expansion cavity 21 and the second resonant cavity 32.

The lower part of the resistive cavity 4 is separated by a horizontal fifth partition plate 55 to form a third resonant cavity 33, a third middle pipe 63 is fixed on the second partition plate 52, two ends of the third middle pipe 63 are respectively communicated with the second expansion cavity 22 and the third resonant cavity 33, and gas diffused into the second expansion cavity 22 enters the third resonant cavity 33 through the third middle pipe 63.

In other embodiments of the present invention, the muffling frequency of the helmholtz resonator can be changed by changing the pipe cross-sectional area of the resonator or the volume of the resonator, so as to adjust the energy ratio of each order of the exhaust noise. For example, the third partition 53 and the fourth partition 54 are provided as movable partitions, so that the cavity size of the resonant cavity can be adjusted, and thus the sound attenuation frequency of the first resonant cavity 31 and the second resonant cavity 32 can be adjusted.

Furthermore, the energy ratio of each order of exhaust noise can be adjusted by simultaneously changing the sectional area S of the Helmholtz resonant cavity pipeline, the volume V of the Helmholtz resonant cavity and the length L of the Helmholtz resonant cavity pipeline.

In the embodiment, 3 Helmholtz resonant cavities are adopted to adjust the energy ratio of each order of the low frequency band, 2 expansion cavities are adopted to adjust the energy ratio of the middle frequency band, and 1 resistive cavity 4 is adopted to eliminate the high frequency band noise, so that the aim of improving the quality of the exhaust sound is fulfilled. In other embodiments of the present invention, the actual noise requirements of different automobile products can be met by increasing or decreasing the number of the resonant cavities, the expansion cavities, and the resistive cavities 4 and changing the position distribution of the resonant cavities, the expansion cavities, and the resistive cavities 4, so as to improve the automobile sound quality in the full rotation speed range of different engines.

Since the larger the number of resonant cavities, the wider the order range of the adjustable low-frequency exhaust noise, in some embodiments of the present invention, one or more resonant cavities communicating with the first expansion cavity 21 may be provided, the first resonant cavity 31 and the second resonant cavity 32 may be combined into a whole, or a plurality of vertical fourth partition plates 54 may be provided to divide the resonant cavity disposed above the first expansion cavity 21 into more small resonant cavities. The number of resonant cavities communicating with other expansion cavities may also be set as desired, and the present invention is not particularly limited.

The noise adjusting device provided by the invention is also provided with a controller 7 and an actuator 8, wherein the controller 7 is electrically connected with the actuator 8, the actuator 8 is respectively electrically connected with different middle pipes, the controller 7 can control the actuator 8 to adjust the length of the middle pipe inserted into at least one resonant cavity, and then the silencing frequencies of different resonant cavities are adjusted to adapt to the change of the rotating speed of an engine.

The controller 7 can send an execution instruction to the actuator 8 according to the rotating speed signal of the engine, the exhaust temperature and pressure signal of the air inlet pipe 20, the noise signal of the air inlet pipe 20 and a preset control program, and the actuator 8 can change the lengths of different intermediate pipes according to the execution instruction of the controller 7. The controller 7 may also be configured to implement feedback control of the actuator 8 based on a noise signal from the exhaust pipe 30.

In some embodiments of the present invention, the housing 1 of the noise adjusting device and the resonant cavity, the expansion cavity and the resistive cavity in the housing 1 may be shaped as required, for example, the noise adjusting device may be a box type noise adjusting device, a barrel type noise adjusting device or a special-shaped noise adjusting device.

In some embodiments of the present invention, the air inlet pipe 20 and the air outlet pipe 30 are both horizontally arranged, and the air inlet pipe 20 is located below the air outlet pipe 30, so that the arrangement of lower air inlet and upper air outlet is more beneficial to the flow of air.

In a second aspect of the present invention, a vehicle is provided, which has the noise control device described above, and an intake pipe 20 of the noise control device is connected to an exhaust manifold of an engine of the vehicle. The exhaust airflow of the automobile flows through an exhaust manifold and enters the noise adjusting device through an air inlet pipe 20, and the energy ratio of the middle frequency band can be adjusted by gradually eliminating noise through expansion cavities sequentially arranged along the airflow direction, so that the middle frequency noise is eliminated; the sound can be absorbed and the high-frequency noise can be eliminated through the resistive cavity 4; by adjusting the length of the pipeline of different resonant cavities, the silencing frequency of each resonant cavity can be adjusted, the energy ratio of each order of the low-frequency band of the exhaust noise is adjusted, and the noise of low-frequency components is reduced. The noise-reduced gas is discharged through the exhaust pipe 30 and then flows through the exhaust tail pipe of the engine to be introduced into the atmosphere, and the exhaust energy of the engine is eliminated again through the long tail pipe effect, so that the noise of the engine is finally successfully eliminated, and the sound quality of the automobile is improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A noise modifying apparatus, comprising:

a housing having an air inlet and an air outlet;

the first expansion cavity and the second expansion cavity are arranged in the shell, the first expansion cavity and the second expansion cavity are sequentially communicated and arranged along the exhaust movement direction, the air inlet is communicated with the first expansion cavity, the length and the width of the first expansion cavity are different from those of the second expansion cavity, and the first expansion cavity and the second expansion cavity are set to adjust the energy ratio of the middle frequency band;

the first resonant cavity is communicated with the first expansion cavity through a first middle pipe, the second resonant cavity is communicated with the first expansion cavity through a second middle pipe, the third resonant cavity is communicated with the second expansion cavity through a third middle pipe, and the first resonant cavity, the second resonant cavity and the third resonant cavity are arranged to adjust the energy ratio of each order of exhaust noise;

the resistance cavity is internally provided with an exhaust inner tube, one end of the exhaust inner tube is communicated with the exhaust port, the other end of the exhaust inner tube is communicated with the second expansion cavity, and the resistance cavity is used for eliminating high-frequency noise so as to highlight order noise;

the first expansion cavity, the second expansion cavity and the resistive cavity are formed by separating vertical first partition plates and vertical second partition plates which are sequentially arranged at intervals along the axial direction of the shell;

in the first expansion cavity, a resonant cavity is formed by separating a third partition plate horizontally arranged above the first expansion cavity, and the resonant cavity is divided into the first resonant cavity and the second resonant cavity by a fourth partition plate vertically arranged in the resonant cavity;

the lower part of the resistive cavity is separated by a horizontal fifth partition plate to form a third resonant cavity;

the controller is electrically connected with the actuator and can control the actuator according to a noise signal of an exhaust pipe so as to adjust the lengths of the first middle pipe inserted into the first resonant cavity, the second middle pipe inserted into the second resonant cavity and the third middle pipe inserted into the third resonant cavity, and therefore the energy ratio of each order in exhaust noise is adjusted.

2. The noise adjusting device according to claim 1, wherein an air inlet inner tube is disposed inside the first expansion cavity, one end of the air inlet inner tube is communicated with the air inlet, the other end of the air inlet inner tube is communicated with the second expansion cavity, and a plurality of first through holes are uniformly distributed on a side wall of the air inlet inner tube along a circumferential direction.

3. The noise adjusting device of claim 1, wherein the middle tube is a telescopic sleeve, the telescopic sleeve comprises an outer tube and an inner tube coaxially sleeved in the outer tube, and the inner tube can linearly move back and forth along the axial direction of the outer tube to extend out of or into the outer tube, so as to adjust the length of the middle tube.

4. The noise-regulating device of claim 1, wherein the side wall of the inner exhaust pipe has a plurality of second perforations distributed uniformly along the circumferential direction.

5. The noise modulation device of claim 1, wherein a resistive material is disposed within the resistive cavity for absorbing high band noise.

6. An automobile, characterized by having a noise-regulating device according to any one of claims 1 to 5, the air intake of which is connected to an exhaust manifold of an engine of the automobile.