Vehicle exhaust system

Abstract

The invention provides a vehicle exhaust system which comprises an exhaust pipe and a standing wave breaking section, the standing wave breaking section is arranged on the exhaust pipe, the standing wave breaking section and the exhaust pipe jointly form an exhaust passage, and when the exhaust passage exhausts, standing waves with the frequency the same as the resonant frequency of the exhaust passage are generated in the exhaust passage; wherein a through hole is formed in the standing wave breaking section, the interior of the exhaust pipe is communicated with the exterior of the exhaust pipe through the through hole, the standing wave breaking section is arranged to be capable of generating sound waves with the frequency the same as that of standing waves through the through hole, and the position of the standing wave breaking section on the exhaust pipe is staggered from the antinode position of the standing waves. According to the vehicle exhaust system, original standing waves are broken into waves with shorter wavelengths through the standing wave breaking section, so that the resonant frequency of an exhaust passage is avoided, and the purposes of noise elimination and resonance reduction are achieved; meanwhile, the structure is small in size, capable of saving the space of a chassis, simple in structure, difficult to store water and capable of reducing corrosion of a tail pipe of the exhaust pipe.

Description

Technical Field

[0001] The present application relates to the field of vehicle exhaust technology, and in particular to a vehicle exhaust system. Background Art

[0002] The exhaust system of vehicles currently using internal combustion engines may generate standing waves when exhausting. If the frequency of the standing waves is the same as the resonant frequency of the exhaust pipe, the noise and vibration generated will greatly reduce the comfort inside the vehicle.

[0003] In the related art, a muffler is usually used to reduce exhaust noise. In order to have sufficient noise reduction in the entire frequency range of exhaust noise, 2-3 mufflers need to be installed on the engine exhaust pipe. Mufflers can be divided into resistive mufflers and reactive mufflers according to the muffler principle. Figure 1 The noise reduction principle diagram of the resistive silencer is shown in FIG. Figure 1 As shown, the exhaust gas passes through the small holes on the pipe wall and enters the resistive muffler, which is filled with silencer cotton made of glass fiber. The sound wave energy is weakened by the silencer bag to achieve silencer. Figure 2 The noise reduction principle diagram of the reactive silencer is shown in FIG. Figure 2 As shown, the exhaust gas reflects back and forth in the chamber, achieving a noise reduction effect through interference.

[0004] However, the above two types of mufflers will occupy a large space in the vehicle chassis, making the vehicle chassis layout difficult, and there are complex muffler components in the muffler, which easily accumulates water and causes the tail pipe of the exhaust pipe to be corroded. Summary of the invention

[0005] To at least partially solve the above-mentioned problems, an embodiment of the present application provides a vehicle exhaust system, which includes an exhaust pipe and a standing wave interrupter. The standing wave interrupter is arranged on the exhaust pipe, and the standing wave interrupter and the exhaust pipe together form an exhaust passage. When the exhaust passage is exhausted, a standing wave with a frequency equal to the resonant frequency of the exhaust passage is generated in the exhaust passage; wherein a through hole is provided on the standing wave interrupter, and the through hole connects the inside of the exhaust pipe with the outside of the exhaust pipe. The standing wave interrupter is arranged to generate a sound wave with a frequency equal to the frequency of the standing wave through the through hole, and the position of the standing wave interrupter on the exhaust pipe is staggered with the position of the antinode of the standing wave.

[0006] In some embodiments, there are multiple standing wave interruption nodes, and the multiple standing wave interruption nodes are distributed on the exhaust pipe along the extension direction of the exhaust pipe.

[0007] In some embodiments, along the exhaust direction of the exhaust passage, a distance between a first standing wave interruption node and a last standing wave interruption node is smaller than a wavelength of the standing wave.

[0008] In some embodiments, the standing wave interruption section includes a first interruption section, a second interruption section and a third interruption section, and the first interruption section, the second interruption section and the third interruption section are sequentially distributed along the exhaust direction of the exhaust passage; wherein the wavelength of the standing wave is λ, and along the exhaust direction of the exhaust passage, the first interruption section is located behind an antinode of the standing wave and the distance from the antinode is The distance between the second interruption section and the first interruption section The distance between the third interruption and the second interruption

[0009] In some embodiments, the standing wave interrupter includes a tube body, which is connected to the exhaust pipe and forms an exhaust channel with the exhaust pipe; wherein a through hole is opened on the tube body, and the through hole connects the inner cavity of the tube body with the outside of the tube body, and the tube wall of the tube body is concave into the tube cavity to form a groove, and the through hole is arranged on the side wall of the groove.

[0010] In some embodiments, the groove extends along the circumference of the tube body, the groove includes a first side wall and a second side wall, the second side wall is located behind the first side wall in the exhaust direction of the exhaust passage, and the through hole is arranged on the second side wall.

[0011] In some embodiments, there are multiple through holes, and the multiple through holes are distributed along the circumference of the tube body on the second side wall.

[0012] In some embodiments, there are multiple grooves, and the multiple grooves are distributed along the axial direction of the tube body at the same circumferential position of the tube body.

[0013] In some embodiments, the vehicle exhaust system further includes a first muffler, which is disposed on the exhaust pipe and is located in front of all standing wave interruption nodes in the exhaust direction of the exhaust passage.

[0014] In some embodiments, the vehicle exhaust system also includes a second muffler, which is arranged on the exhaust pipe and has a volume smaller than that of the first muffler; wherein, in the exhaust direction, the first muffler, the second muffler and the standing wave interrupter are arranged in sequence.

[0015] The vehicle exhaust system provided by the embodiment of the present application generates a sound wave with the same frequency as the standing wave in the exhaust passage through a standing wave interrupting section with a through hole. The sound wave can form another standing wave in the exhaust passage, and because the standing wave interrupting section is staggered with the antinode position of the original standing wave in the exhaust pipe, the antinode position of the other standing wave is also staggered with the antinode position of the original standing wave. By utilizing the principle of wave superposition, the other standing wave interrupts the original standing wave into a wave with a shorter wavelength, so that the frequency of the superimposed wave formed after the two columns of standing waves are superimposed is different from the frequency of the two columns of standing waves before the superposition, thereby avoiding the resonant frequency of the exhaust passage and achieving the purpose of silencing and reducing resonance; at the same time, the standing wave interrupting section is provided with a through hole connecting the inside and outside of the exhaust pipe. When there is airflow flowing in the exhaust pipe, an internal and external pressure difference is generated on both sides of the through hole, so that external gas enters the exhaust pipe, thereby generating sound waves. The above structure has a small volume and high space utilization, which can save chassis space, and has a simple structure, is difficult to store water, and reduces tail pipe corrosion of the exhaust pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 is a schematic diagram of the noise elimination principle of the resistive muffler provided in the embodiment of the present application;

[0018] Figure 2 is a schematic diagram of the muffler principle of the reactive muffler provided in the embodiment of the present application;

[0019] Figure 3 It is a structural schematic diagram of a vehicle exhaust system in the related art;

[0020] Figure 4 is a schematic structural diagram of a vehicle exhaust system provided in an embodiment of the present application;

[0021] Figure 5 is a schematic diagram of a standing wave interruption section provided in an embodiment of the present application for interrupting a standing wave generated in an exhaust passage;

[0022] Figure 6 It is a schematic diagram of the structure of the standing wave interruption section provided in the embodiment of the present application.

[0023] The reference numerals are as follows:

[0024] 10. Exhaust pipe; 20. First muffler; 30. Third muffler; 40. Tail pipe; 50. Fixed bracket; 60. Standing wave interruption section; 601. Pipe body; 602. Through hole; 603. Groove; 61. First interruption section; 62. Second interruption section; 63. Third interruption section; 70. Second muffler.

[0025] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0026] The technical scheme of the preferred embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection claimed in the present application.

[0027] The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] The exhaust system of vehicles using internal combustion engines may produce standing waves when exhausting. Standing waves are formed by the superposition of two waves with the same amplitude and frequency propagating in opposite directions. Unlike traveling waves, the waveform of a standing wave no longer advances, and the positions of the nodes (the positions on the waveform where the amplitude is always 0) and the antinodes (the positions on the waveform where the amplitude is the largest) always remain unchanged. In the exhaust system, if the exhaust pipe is too long, the sound mode in the pipe can easily resonate with the structural mode of the pipe. For example, in a long straight pipe, the relationship between the wavelength of the standing wave and the length of the pipe is shown in the following formula:

[0029]

[0030] Where L is the length of the pipe, λ is the wavelength of the standing wave, and n is 0, 1, 2, 3, etc.

[0031] For example, at a temperature of 400°C, for a 1.5-meter-long exhaust pipe, the sound wave frequency is 173Hz (the speed of sound is affected by temperature). Usually, there is a resonance frequency of the exhaust pipe structure near this frequency. The sound wave and the exhaust pipe structure may resonate, and the standing wave has a vibration enhancement peak (i.e., the antinode position) every λ / 2.

[0032] Figure 3 It is a schematic diagram of the structure of the vehicle exhaust system in the related art. Figure 3 As shown, in order to achieve silencing of the exhaust system, in the related art, a first muffler 20 (i.e., a front muffler package) is usually arranged in the middle section of the exhaust pipe 10, and a third muffler 30 (i.e., a rear muffler package) is arranged at the end of the exhaust pipe 10. The third muffler 30 is usually a resistive muffler or a reactive muffler, which is large in size, making the layout of the vehicle chassis difficult, and the third muffler 30 has a complex muffler assembly inside, which is easy to accumulate water, causing the tail pipe 40 of the exhaust pipe 10 to be corroded.

[0033] To at least partially solve the above problems, an embodiment of the present application provides a vehicle exhaust system. Figure 4 FIG. 1 is a schematic diagram of the structure of a vehicle exhaust system provided in an embodiment of the present application. Figure 4 As shown, the vehicle exhaust system includes an exhaust pipe 10 and a standing wave interrupting section 60. The standing wave interrupting section 60 is arranged on the exhaust pipe 10. The standing wave interrupting section 60 and the exhaust pipe 10 together form an exhaust passage, that is, the standing wave interrupting section 60 also forms a part of the exhaust passage. A more detailed description of the structure of the standing wave interrupting section 60 will be described later. When the exhaust passage is exhausted, a standing wave with a frequency the same as the resonant frequency of the exhaust passage is generated in the exhaust passage. The resonant frequency of the exhaust passage is related to the structure of the exhaust passage. Once the structure of the exhaust passage is determined, its resonant frequency is also determined. The method of determining the resonant frequency is well known in the art and will not be described in detail in this application. The standing wave with a frequency the same as the resonant frequency of the exhaust passage has the greatest impact on the exhaust passage. The technical solution of the present application mainly deals with the standing wave of this frequency.

[0034] A through hole 602 is provided on the standing wave interruption section 60, and the through hole 602 connects the inside of the exhaust pipe 10 with the outside of the exhaust pipe 10. The standing wave interruption section 60 is configured to generate a sound wave with a frequency the same as the frequency of the standing wave through the through hole 602. Specifically, when exhaust gas flows through the exhaust passage, a pressure difference will be formed between the inside and outside of the through hole 602, so that the air outside the exhaust passage can enter the exhaust passage, so that the position where the through hole 602 is provided on the standing wave interruption section 60 forms a new wave source, changing the gas vibration model in the exhaust passage. By reasonably setting the structure of the standing wave interruption section, the standing wave interruption section can generate a sound wave of a suitable frequency through the through hole. It can be understood that the standing wave interruption section 60 usually generates a sound wave with a frequency range, that is, the standing wave interruption section 60 will also simultaneously generate a sound wave with a frequency different from the frequency of the standing wave, but this sound wave is not the sound wave used in this application, and the standing wave interruption section 60 only needs to be able to generate a sound wave with a frequency the same as the frequency of the standing wave.

[0035] The position of the standing wave interruption node 60 on the exhaust pipe 10 is offset from the position of the antinode of the standing wave, and the position of the antinode of the standing wave can be determined by simulation analysis of the exhaust passage. It can be understood that the position of the standing wave interruption node 60 is the position of the wave source, where there must be peaks and troughs. When the sound wave generated by the standing wave interruption node 60 forms a standing wave, the position of the wave source is the position of an antinode. Therefore, by staggering the position of the standing wave interruption node 60 on the exhaust pipe 10 with the position of the antinode of the standing wave, the position of the antinode of the standing wave generated by the standing wave interruption node 60 can be controllably controlled, so that the antinode of the new standing wave is offset from the antinode of the original standing wave, and the original standing wave is interrupted by superimposing the new standing wave to form a new superimposed wave. The new superimposed wave forms a new standing wave peak point (i.e., antinode), and the equivalent wavelength becomes shorter, that is, the equivalent frequency becomes larger, and is no longer the same as the resonant frequency of the exhaust passage, that is, the standing wave that has the greatest impact on the exhaust passage is eliminated, and the sound elimination effect is achieved.

[0036] The vehicle exhaust system provided by the embodiment of the present application generates a sound wave with the same frequency as the standing wave in the exhaust passage through a standing wave interrupting node 60 with a through hole 602. The sound wave can form another standing wave in the exhaust passage, and because the standing wave interrupting node 60 is offset from the antinode position of the original standing wave in the exhaust pipe 10, the antinode position of the other standing wave is also offset from the antinode position of the original standing wave. By utilizing the principle of wave superposition, the other standing wave interrupts the original standing wave into a wave with a shorter wavelength, so that the frequency of the superimposed wave formed after the two columns of standing waves are superimposed is different from the frequency of the two columns of standing waves before superposition, thereby avoiding the resonant frequency of the exhaust passage and achieving the purpose of silencing and reducing resonance; at the same time, the standing wave interrupting node 60 is provided with a through hole 602 connecting the inside and outside of the exhaust pipe 10. When there is airflow flowing in the exhaust pipe 10, an internal and external pressure difference is generated on both sides of the through hole 602, so that external gas enters the exhaust pipe 10, thereby generating sound waves. The above structure has a small volume and high space utilization, which can save chassis space, and has a simple structure, is difficult to store water, and reduces corrosion of the tail pipe 40 of the exhaust pipe 10.

[0037] In some embodiments, there are multiple standing wave interruption sections 60, and the multiple standing wave interruption sections 60 are distributed on the exhaust pipe 10 along the extension direction of the exhaust pipe 10. In this embodiment, by providing multiple standing wave interruption sections 60 and introducing multiple wave sources, the sound waves generated by the multiple wave sources can achieve multiple interruptions of the standing wave, further reducing the wavelength of the standing wave, thereby increasing the frequency of the standing wave, avoiding resonance in the exhaust passage, and obtaining a better silencing effect.

[0038] In some embodiments, along the exhaust direction of the exhaust passage, the distance between the first standing wave interruption section 60 and the last standing wave interruption section 60 is less than the wavelength of the standing wave. In this embodiment, this arrangement facilitates the arrangement of the standing wave interruption section 60, and prevents the standing wave interruption section 60 from being arranged in an improper position, resulting in the generated sound wave reinforcing the original standing wave.

[0039] like Figure 4 and Figure 5 As shown, in some embodiments, the standing wave interruption node 60 includes a first interruption node 61, a second interruption node 62 and a third interruption node 63, and the first interruption node 61, the second interruption node 62 and the third interruption node 63 are sequentially distributed along the exhaust direction of the exhaust passage; wherein, the wavelength of the standing wave (the original standing wave in the exhaust passage) is λ, and along the exhaust direction of the exhaust passage, the first interruption node 61 is located behind an antinode of the standing wave and the distance from the antinode is The distance between the second interruption section 62 and the first interruption section 61 The distance between the third interruption section 63 and the second interruption section 62 In this embodiment, the above arrangement can achieve three even interruptions of the original standing wave, so that the original standing wave becomes an equivalent standing wave with a frequency three times that of the previous one. It should be noted that in this embodiment, the distance between the first position and the second position along the exhaust direction of the exhaust passage is not the linear distance between the first position and the second position in space, but the distance of a particle moving from the first position to the second position along the exhaust direction, and the exhaust direction is the same as the extension direction of the exhaust passage.

[0040] Specifically, in Figure 5 In the figure, the position of an antinode of the original standing wave is shown (the position of the antinode can produce a peak or a trough, Figure 5 The waveform diagram when the antinode position is in the shape of a wave crest and the waveform diagram when the antinode position is in the shape of a wave trough are shown in FIG. Figure 5 The first interruption section 61 is located behind the antinode in the exhaust direction and is 1.5 meters away from the antinode. The first interruption node 61 is used as a new first wave source. The position of the first interruption node 61 is the antinode position of the standing wave generated by the first wave source. The standing wave generated by the first wave source has two antinode positions within the λ length. The distance between the second interruption node 62 and the first interruption node 61 is The second interruption node 62 is used as a new second wave source. The position of the second interruption node 62 is the antinode position of the standing wave generated by the second wave source. The standing wave generated by the second wave source has two antinode positions within the λ length. The distance between the third interruption node 63 and the second interruption node 62 is The third interruption node 63 is used as a new third wave source. The position of the third interruption node 63 is the antinode position of the standing wave generated by the third wave source. The standing wave generated by the third wave source has two antinode positions within the length λ. It can be understood that the original standing wave has only two antinode positions within each wavelength, but after being interrupted by three standing wave interruption nodes 60 (i.e., the first interruption node 61, the second interruption node 62, and the third interruption node 63), after the antinodes of the standing wave generated by each standing wave interruption node 60 are superimposed, there are eight antinode positions within the length λ, and the spacing between the antinodes is Assuming that the original standing wave frequency is 173 Hz, the first interruption node 61 and the second interruption node 62 jointly interrupt the standing wave to an equivalent frequency of 346 Hz. At this time, the standing wave noise has been significantly weakened. The third interruption node 63 further interrupts the standing wave, and the equivalent frequency is 692 Hz.

[0041] like Figure 6 As shown, in some embodiments, the standing wave interrupter 60 includes a tube body 601, which is connected to the exhaust pipe 10 and forms an exhaust passage with the exhaust pipe 10. The openings at both ends of the tube body 601 can be connected to the exhaust pipe 10 respectively to form an exhaust passage with the exhaust pipe 10. Among them, a through hole 602 is opened on the tube body 601, and the through hole 602 connects the inner cavity of the tube body 601 with the outside of the tube body 601. The tube wall of the tube body 601 is concave into the tube cavity to form a groove 603, and the through hole 602 is arranged on the side wall of the groove 603. In this embodiment, by setting the groove 603, when other air in the tube passes through the groove 603, a vortex is formed inside the tube body 601, thereby forming a pressure difference between the inside and outside of the tube. The outside air can enter the tube body 601 from the through hole 602 through this pressure difference, change the gas vibration model in the exhaust passage, and form a new wave source and standing wave peak point.

[0042] In some embodiments, the groove 603 extends along the circumference of the tube body 601, and the groove 603 includes a first side wall and a second side wall, the second side wall is located at the rear side of the first side wall in the exhaust direction of the exhaust passage, and the through hole 602 is arranged on the second side wall. In this embodiment, by arranging the through hole 602 on the second side wall, when the gas in the pipeline flows along the exhaust direction, the second side wall is on the leeward side, which can prevent the exhaust gas in the pipeline from flowing out through the through hole 602. In some embodiments, the number of through holes 602 is multiple, and the multiple through holes 602 are distributed along the circumference of the tube body 601 on the second side wall. The specific number and location of the through holes 602 and the groove 603 can be determined based on acoustic analysis and testing. In some embodiments, the number of grooves 603 is multiple, and the multiple grooves 603 are distributed along the axial direction of the tube body 601 at the same circumferential position of the tube body 601.

[0043] In some embodiments, the vehicle exhaust system further comprises a first muffler 20, which is disposed on the exhaust pipe 10, and is located in front of all standing wave interruption nodes 60 in the exhaust direction of the exhaust passage. In this embodiment, after the noise is processed by the first muffler 20, the standing wave is processed by the standing wave interruption node 60, so that a better noise reduction effect can be obtained.

[0044] In some embodiments, the vehicle exhaust system further includes a second muffler 70, which is disposed on the exhaust pipe 10, and the volume of the second muffler 70 is smaller than the volume of the first muffler 20; wherein, in the exhaust direction, the first muffler 20, the second muffler 70 and the standing wave interruption section 60 are disposed in sequence. In this embodiment, in order to further ensure the noise elimination effect, the second muffler 70 can be disposed between the first muffler 20 and the standing wave interruption section 60, and the volume of the second muffler 70 is smaller than the volume of the first muffler 20, so as to minimize the occupied space. Exemplarily, the second muffler 70 can be a small muffler bag.

[0045] In some embodiments, one or more fixing brackets 50 are further provided along the extension direction of the exhaust pipe 10 , and the fixing brackets 50 are used to fix the exhaust pipe 10 to the vehicle.

[0046] Based on the above-mentioned embodiments of the present application, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0047] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are only for illustration and not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A vehicle exhaust system, characterized in that: include: Exhaust pipe; A standing wave interrupting section, wherein the standing wave interrupting section is arranged on the exhaust pipe, and the standing wave interrupting section and the exhaust pipe together form an exhaust passage, and when the exhaust passage is exhausted, a standing wave having a frequency equal to a resonance frequency of the exhaust passage is generated in the exhaust passage; A through hole is provided on the standing wave interrupting node, and the through hole connects the inside of the exhaust pipe with the outside of the exhaust pipe. The standing wave interrupting node is configured to generate a sound wave with the same frequency as the frequency of the standing wave through the through hole, and the position of the standing wave interrupting node on the exhaust pipe is staggered from the position of the antinode of the standing wave.

2. The exhaust system according to claim 1, characterized in that There are multiple standing wave interruption nodes, and the multiple standing wave interruption nodes are distributed on the exhaust pipe along the extension direction of the exhaust pipe.

3. The exhaust system according to claim 2, characterized in that: Along the exhaust direction of the exhaust passage, the distance between the first standing wave interruption node and the last standing wave interruption node is smaller than the wavelength of the standing wave.

4. The exhaust system according to claim 3, characterized in that The standing wave interruption section includes a first interruption section, a second interruption section and a third interruption section, and the first interruption section, the second interruption section and the third interruption section are sequentially distributed along the exhaust direction of the exhaust passage; The wavelength of the standing wave is λ, and along the exhaust direction of the exhaust passage, the first interruption node is located behind an antinode of the standing wave and the distance from the antinode is The distance between the second interruption section and the first interruption section The distance between the third interruption section and the second interruption section 5. The vehicle exhaust system according to claim 1, characterized in that: The standing wave interrupter comprises a tube body, which is connected to the exhaust pipe and forms an exhaust passage with the exhaust pipe; The tube body is provided with the through hole, which connects the inner cavity of the tube body with the outside of the tube body, and the tube wall of the tube body is concave into the tube cavity to form a groove, and the through hole is arranged on the side wall of the groove.

6. The vehicle exhaust system according to claim 5, characterized in that: The groove extends along the circumference of the tube body, and includes a first side wall and a second side wall. The second side wall is located at the rear side of the first side wall in the exhaust direction of the exhaust passage, and the through hole is arranged on the second side wall.

7. The vehicle exhaust system according to claim 6, characterized in that: There are multiple through holes, and the multiple through holes are distributed on the second side wall along the circumference of the tube body.

8. The vehicle exhaust system according to claim 5, characterized in that: The number of the grooves is multiple, and the multiple grooves are distributed along the axial direction of the tube body at the same circumferential position of the tube body.

9. The vehicle exhaust system according to claim 1, characterized in that: Also includes: A first muffler is provided on the exhaust pipe, and the first muffler is located in front of all standing wave interruption nodes in the exhaust direction of the exhaust passage.

10. The vehicle exhaust system according to claim 9, characterized in that Also includes: a second muffler, the second muffler being arranged on the exhaust pipe, and the volume of the second muffler being smaller than the volume of the first muffler; Wherein, in the exhaust direction, the first muffler, the second muffler and the standing wave interruption section are arranged in sequence.

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