Muffler, vehicle, and muffler control method

Abstract

The present application belongs to the technical field of vehicles, and discloses a muffler, a vehicle and a muffler control method. The muffler comprises a shell, a distribution assembly, a first muffling pipe and a second muffling pipe. The shell is provided with an air inlet. The distribution assembly is arranged in the shell. The first muffling pipe and the second muffling pipe are used for eliminating noise of different frequencies. The air inlet is selectively communicated with at least one of the first muffling pipe and the second muffling pipe through the distribution assembly, so that the muffler can eliminate noise of different frequencies.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a muffler, a vehicle, and a muffler control method. Background Technology

[0002] The noise from a car's exhaust system directly affects the driving and riding experience of the driver and passengers, so a muffler needs to be installed on the car's exhaust system to reduce noise.

[0003] Existing mufflers can only eliminate noise at fixed frequencies, while the noise frequency of a car's exhaust system changes with engine operating conditions, thereby reducing the car's NVH (noise, vibration, and harshness) characteristics.

[0004] Therefore, how to enable a silencer to eliminate noise of different frequencies is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The first objective of this invention is to provide a silencer capable of eliminating noise of different frequencies.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Muffler, including:

[0008] The housing has an air inlet.

[0009] A distribution component is housed within the casing.

[0010] The first muffler and the second muffler are used to eliminate noise of different frequencies. The air inlet is selectively connected to at least one of the first muffler and the second muffler via a distribution assembly.

[0011] Optionally, the distribution assembly includes a first partition, a distribution member, and a driving member. The first partition is disposed inside the housing and has a first air hole and a second air hole. The first silencer pipe and the second silencer pipe are located on the same side of the first partition and are respectively connected to the first air hole and the second air hole. The distribution member has an air inlet chamber that is connected to an air inlet. The distribution member is movably connected to the side of the first partition away from the first silencer pipe. As the distribution member moves, the air inlet chamber can selectively connect to at least one of the first air hole and the second air hole. The driving member is used to drive the distribution member to move relative to the first partition.

[0012] Optionally, the distribution component is further provided with a first air outlet, a second air outlet, and a third air outlet. The first air outlet, the second air outlet, and the third air outlet are all connected to the air inlet chamber. The third air outlet is located between the first air outlet and the second air outlet. When the first air outlet and the second air outlet are connected to the first air outlet and the second air outlet respectively, the connection between the third air outlet and the first air outlet and the second air outlet is disconnected. When the third air outlet is connected to the first air outlet, the connection between the first air outlet and the second air outlet and the second air outlet is disconnected. When the third air outlet is connected to the second air outlet, the connection between the first air outlet and the second air outlet and the first air outlet is disconnected.

[0013] Optionally, the first partition plate has a groove on the side opposite to the first silencer pipe, and the first and second air holes are alternately opened on the inner wall of the groove. The distribution component is embedded and rotatably disposed in the groove. The first air outlet, the third air outlet, and the second air outlet are distributed around the axis of rotation of the distribution component. The diameter of the third air outlet is less than or equal to the distance between the first and second air holes. When the third air outlet is connected to the first air hole, the outer wall of the distribution component blocks the second air hole. When the third air outlet is connected to the second air hole, the outer wall of the distribution component blocks the first air hole.

[0014] Optionally, the dispensing assembly further includes a connecting arm and a first connecting shaft. The connecting arm is connected to the dispensing component and has a strip hole. The extension direction of the strip hole is perpendicular to the axis of rotation of the dispensing component. The first connecting shaft passes through the strip hole and slides in fit with the strip hole. The first connecting shaft is connected to the driving end of the driving component, and the driving component can drive the first connecting shaft to reciprocate linearly.

[0015] Optionally, the first partition separates a first cavity within the housing, the air inlet is located on the cavity wall of the first cavity, the distributor is located within the first cavity, the air inlet is an open cavity, and the air inlet is connected to the air inlet through the first cavity.

[0016] The second objective of this invention is to provide a vehicle capable of eliminating noise of different frequencies within the exhaust pipe.

[0017] To achieve this objective, the present invention adopts the following technical solution:

[0018] The vehicle includes an exhaust pipe and the aforementioned muffler, with the air intake connected to the exhaust pipe.

[0019] Optionally, the vehicle also includes an engine and an ECU. Both the engine and the distribution assembly are connected to the ECU via signals. The ECU is used to monitor the operating conditions of the engine and control the distribution assembly to selectively connect the air intake to at least one of the first muffler and the second muffler.

[0020] The third objective of this invention is to provide a muffler control method that can precisely reduce noise in the exhaust pipe according to different operating conditions of the vehicle engine.

[0021] To achieve this objective, the present invention adopts the following technical solution:

[0022] A muffler control method is applied to the aforementioned vehicle. A first muffler is used to eliminate low-frequency noise, and a second muffler is used to eliminate mid-to-high-frequency noise. The vehicle also includes an engine with a rated power of Pe and an output power of P. The muffler control method includes:

[0023] When the engine is idling, the air intake is connected to the first muffler and disconnected from the second muffler.

[0024] When P < 30% × Pe, the air inlet is connected to the first muffler pipe, and the connection between the air inlet and the second muffler pipe is disconnected.

[0025] When P ≥ 30% × Pe, the air inlet is connected to the second muffler.

[0026] Optionally, the muffler control method further includes:

[0027] When 30%×Pe≤P<45%×Pe, disconnect the air inlet from the first muffler.

[0028] When P ≥ 45% × Pe, the air inlet is connected to the first silencer pipe.

[0029] Beneficial effects:

[0030] The muffler provided by the present invention is provided with a first muffler pipe and a second muffler pipe. The first muffler pipe and the second muffler pipe are used to eliminate noise of different frequencies. A distribution component is provided inside the housing of the muffler. The air inlet on the housing is selectively connected to at least one of the first muffler pipe and the second muffler pipe through the distribution component, thereby enabling the muffler to eliminate noise of different frequencies.

[0031] The vehicle provided by this invention uses the above-mentioned muffler, which connects the air inlet of the muffler to the vehicle's exhaust pipe, thereby eliminating noise of different frequencies in the exhaust pipe and improving the vehicle's NVH characteristics.

[0032] The muffler control method provided by this invention addresses the issue that when the vehicle engine is idling or the engine output power is less than 30% of the rated power, the exhaust pipe noise is mainly low-frequency noise. In this case, a first muffler is used to reduce the noise of the exhaust pipe. When the vehicle engine output power is greater than or equal to 30% of the rated power, the exhaust pipe noise is mainly mid-to-high frequency noise. In this case, a second muffler is used to reduce the noise of the exhaust pipe. This reduces noise at different frequencies, achieving precise noise reduction and improving the muffler's sound absorption effect, thus providing a strong guarantee for improving the vehicle's NVH characteristics. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the muffler provided in an embodiment of the present invention. Figure 1 ;

[0034] Figure 2 This is a schematic diagram of the structure of the muffler provided in an embodiment of the present invention. Figure 2 ;

[0035] Figure 3 This is a schematic diagram of the internal structure of the muffler housing provided in an embodiment of the present invention;

[0036] Figure 4 This is a partial enlarged cross-sectional view of the muffler provided in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the gas flow direction when the air inlet is connected to the first silencer pipe in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the gas flow direction when the air inlet is connected to the second silencer pipe in an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the gas flow direction when the air inlet is connected to the first silencer and the second silencer respectively in an embodiment of the present invention;

[0040] Figure 8 This is an exploded structural diagram of the muffler provided in an embodiment of the present invention;

[0041] Figure 9 This is a control logic diagram of the muffler control method provided in the embodiments of the present invention.

[0042] In the picture:

[0043] 10. ECU; 20. Control harness;

[0044] 100. Shell; 110. Shell body; 120. First end cap; 121. Air inlet; 130. Second end cap; 141. First cavity; 142. Second cavity; 143. Third cavity; 144. Fourth cavity; 210. First silencer pipe; 211. First pipe body; 212. First silencer component; 220. Second silencer pipe; 221. Second pipe body; 222. Second silencer component; 310. First partition; 311. First vent; 312. Second vent; 313. Groove; 320. Distribution component; 321. Air inlet chamber; 322. First air outlet; 323. Second air outlet; 324. Third air outlet; 330. Drive component; 331. Bushing; 332. Bolt; 340. Connecting arm; 341. Strip hole; 350. First connecting shaft; 351. Flat washer; 352. Fixing pin; 360. Second connecting shaft; 361. First nut; 362. Second nut; 410. Second partition; 420. Third partition. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0049] This embodiment provides a muffler, primarily used on vehicle exhaust pipes, capable of eliminating noise at different frequencies. Of course, this muffler can also be applied to other scenarios, such as ship exhaust channels.

[0050] Specifically, such as Figures 1 to 7 As shown, the muffler includes a housing 100, a distribution assembly, a first muffler pipe 210, and a second muffler pipe 220. The housing 100 is provided with an air inlet 121 for communicating with the vehicle's exhaust pipe. The distribution assembly is disposed inside the housing 100. The first muffler pipe 210 and the second muffler pipe 220 are used to eliminate noise of different frequencies. The air inlet 121 is selectively connected to at least one of the first muffler pipe 210 and the second muffler pipe 220 through the distribution assembly.

[0051] The above-mentioned muffler is provided with a first muffler 210 and a second muffler 220. The first muffler 210 and the second muffler 220 are used to eliminate noise of different frequencies. A distribution component is provided inside the housing 100 of the muffler. The air inlet 121 on the housing 100 is selectively connected to at least one of the first muffler 210 and the second muffler 220 through the distribution component, thereby enabling the muffler to eliminate noise of different frequencies.

[0052] In this embodiment, the first silencer 210 is used to eliminate low-frequency noise, and the second silencer 220 is used to eliminate mid-to-high-frequency noise. Of course, in other embodiments, the first silencer 210 can be used to eliminate mid-to-high-frequency noise, and the second silencer 220 can be used to eliminate low-frequency noise, depending on the actual application requirements.

[0053] Optionally, such as Figures 1 to 7As shown, the distribution assembly includes a first partition 310, a distribution component 320, and a driving component 330. The first partition 310 is disposed within the housing 100 and has a first air hole 311 and a second air hole 312. A first silencer pipe 210 and a second silencer pipe 220 are located on the same side of the first partition 310 and are respectively connected to the first air hole 311 and the second air hole 312. The distribution component 320 has an air inlet chamber 321 for air intake. The cavity 321 is connected to the air inlet 121. The distributor 320 is movably connected to the side of the first partition 310 away from the first silencer 210. The drive member 330 is used to drive the distributor 320 to move relative to the first partition 310. As the distributor 320 moves, the air inlet cavity 321 can selectively connect with at least one of the first air hole 311 and the second air hole 312, thereby realizing the switching of the gas flow channel in the silencer, and thus realizing the targeted elimination of noise of different frequencies.

[0054] Furthermore, such as Figures 1 to 7 As shown, the distribution component 320 is also provided with a first air outlet 322, a second air outlet 323, and a third air outlet 324. All three outlets are connected to the air intake chamber 321. The third air outlet 324 is located between the first air outlet 322 and the second air outlet 323. When the first air outlet 322 is connected to the first air outlet 311, and the second air outlet 323 is connected to the second air outlet 312, the connection between the third air outlet 324 and both the first and second air outlets 311 and 312 is broken. This allows the gas to enter the air intake chamber 321 through the air inlet 121 and then enter the first silencer 210 and the second silencer 220 respectively. The first silencer 210 eliminates low-frequency noise, while the second silencer 220 eliminates mid-to-high frequency noise. When the third vent 324 is connected to the first vent 311, the connections between the first vent 322 and the second vent 323 and the second vent 312 are disconnected. This means that after the gas enters the air chamber through the inlet 121, it can only enter the first silencer pipe 210 through the third vent 324 and the first vent 311 in sequence. At this time, the silencer only eliminates low-frequency noise. When the third vent 324 is connected to the second vent 312, the connections between the first vent 322 and the second vent 323 and the first vent 311 are disconnected. This means that after the gas enters the air chamber through the inlet 121, it can only enter the second silencer pipe 220 through the third vent 324 and the second vent 312 in sequence. At this time, the silencer only eliminates mid-to-high-frequency noise.

[0055] Furthermore, such as Figures 1 to 7As shown, the first partition 310 has a groove 313 on the side opposite to the first silencer pipe 210. A first air hole 311 and a second air hole 312 are spaced apart on the inner wall of the groove 313. A distribution member 320 is fitted and rotatably disposed within the groove 313 (i.e., the inner wall of the groove 313 is a contoured wall conforming to the shape of the distribution member 320, the distribution member 320 is rotatably disposed within the groove 313, and the outer wall of the distribution member 320 is in contact with the inner wall of the groove 313). A first air outlet 322, a third air outlet 324, and a second air outlet 323 are distributed around the axis of rotation of the distribution member 320. The diameter of the third air outlet 324 is less than or equal to the diameter of the first air hole 311 and the second air hole 323. The spacing between the air holes 312 allows the first air outlet 322 to communicate with the first air outlet 311, and the second air outlet 323 to communicate with the second air outlet 312. When this communication occurs, the inner wall of the groove 313 blocks the third air outlet 324, disconnecting the communication between the third air outlet 324 and the first air outlet 311 and the second air outlet 312. When the third air outlet 324 communicates with the first air outlet 311, the outer wall of the distributor 320 blocks the second air outlet 312, disconnecting the communication between the second air outlet 312 and the air inlet chamber 321. When the third air outlet 324 communicates with the second air outlet 312, the outer wall of the distributor 320 blocks the first air outlet 311, disconnecting the communication between the first air outlet 311 and the air inlet chamber 321.

[0056] Preferably, such as Figures 1 to 8 As shown, the distributor 320 has a spherical structure, the groove 313 is a spherical groove 313, the first air outlet 322, the third air outlet 324 and the second air outlet 323 are arranged circumferentially around the distributor 320, the distance between the first air outlet 311 and the second air outlet 312 is a, and the diameters of the first air outlet 311, the second air outlet 312, the first air outlet 322, the second air outlet 323 and the third air outlet 324 are all b, a and b are equal. The axis of rotation of the distributor 320 in the groove 313 is parallel to the surface of the first partition 310. This structural design makes the overall structure of the distributor 320 and the first partition 310 more compact after assembly, and the distributor 320 only needs to rotate a small angle to switch the connection between the air inlet 121 and the first pipe 211 and the second pipe 221, thereby reducing the overall volume of the muffler and making it adaptable to limited installation space.

[0057] In one embodiment, the distributor 320 is a cylindrical structure, the groove 313 is a cylindrical groove 313, the first air outlet 322, the third air outlet 324 and the second air outlet 323 are arranged circumferentially around the distributor 320, and the axis of rotation of the distributor 320 in the groove 313 is perpendicular to the surface of the first partition 310. Similarly, the connection between the air inlet 121 and the first pipe 211 and the second pipe 221 can be switched by rotating the distributor 320.

[0058] In another embodiment, the distributor 320 has a plate-like or block-like structure. The distributor 320 is slidably connected to the surface of the first partition 310 opposite to the first tube 211. The first vent 322, the third vent 324, and the second vent 323 are all located on the side of the distributor 320 that is slidably connected to the first partition 310, and the first vent 322, the third vent 324, and the second vent 323 are spaced apart along the sliding direction of the distributor 320. When the distributor 320 slides to the position where the first vent 322 communicates with the first vent 311 and the second vent 323 communicates with the second vent 312, The surface of the first partition 310 facing the distributor 320 blocks the third vent 324; when the distributor 320 slides to the position where the third vent 324 communicates with the first vent 311, the surface of the first partition 310 facing the distributor 320 blocks the first vent 322 and the second vent 323, and the distributor 320 blocks the second vent 312; when the distributor 320 slides to the position where the third vent 324 communicates with the second vent 312, the surface of the first partition 310 facing the distributor 320 blocks the first vent 322 and the second vent 323, and the distributor 320 blocks the first vent 311.

[0059] Optionally, such as Figures 1 to 8 As shown, the distribution assembly also includes a connecting arm 340 and a first connecting shaft 350. The connecting arm 340 is connected to the distribution component 320. The connecting arm 340 is provided with a strip hole 341. The extension direction of the strip hole 341 is perpendicular to the axis of rotation of the distribution component 320. The first connecting shaft 350 passes through the strip hole 341 and slides in cooperation with the strip hole 341. The first connecting shaft 350 is connected to the driving end of the driving component 330. The driving component 330 can drive the first connecting shaft 350 to reciprocate linearly in a direction perpendicular to the surface of the first partition 310. During the movement, the first connecting shaft 350 applies a force to the wall of the strip hole 341, causing the connecting arm 340 to rotate, thereby driving the distribution component 320 to rotate together, realizing the switching of communication between the air inlet 121 and the first pipe 211 and the second pipe 221.

[0060] Furthermore, the drive element 330 is a motor. Of course, in other embodiments, the drive element 330 may also be a reciprocating cylinder or other drive element, which will not be listed here.

[0061] Optionally, such as Figures 1 to 8As shown, the drive component 330 is fixed to the outer wall of the housing 100 by the bushing 331 and bolts. The first connecting shaft 350 passes through the drive end of the drive component 330 and is fixedly connected to the drive end of the drive component 330 by the flat washer 351 and the fixing pin 352. The connecting arm 340 is located on the outside of the housing 100, and the distribution component 320 is located on the inside of the housing 100. The second connecting shaft 360 passes through the distribution component 320, the housing 100 and the connecting arm 340. The first nut 361 and the second nut 362 are respectively threaded to the two ends of the second connecting shaft 360 to realize the fixed connection between the distribution component 320 and the connecting arm 340.

[0062] Optionally, such as Figures 1 to 8 As shown, the housing 100 includes a housing body 110, a first end cap 120, and a second end cap 130. Openings are provided at opposite ends of the housing 100. The first end cap 120 and the second end cap 130 respectively seal the two openings to form a closed space inside the housing body 110. The silencer also includes a second partition 410 and a third partition 420. The first partition 410, the second partition 410, and the third partition 420 are spaced apart within the housing 100, dividing the interior of the housing 100 into a first cavity 141, a second cavity 142, a third cavity 143, and a fourth cavity 144. The first end cap 120 is located in the first cavity 141, and the second end cap 130 is located in the fourth cavity 144. One end of the first silencer pipe 210 is located in the second cavity 142 and connects to the first air vent. The first silencer 210 is connected to the second vent 312, and the other end is connected to the second vent 312. The second vent 312 is connected to the second vent 312, and the other end is connected to the second vent 312. The second vent 310 ...

[0063] Furthermore, such as Figures 1 to 8As shown, the distribution component 320 is located inside the first cavity 141, and the air inlet 121 is opened on the first end cover 120. The air inlet 321 is an open cavity. The air inlet 321 is connected to the air inlet 121 through the first cavity 141, thereby eliminating the need for the connecting pipe between the air inlet 321 and the air inlet 121, which has the effect of simplifying the structure and reducing the difficulty of assembly. Furthermore, when the third vent 324 is connected to the first vent 311, the inner wall of the groove 313 blocks the second vent 323. At this time, the first vent 322 is connected to the first cavity 141. Part of the gas in the intake cavity 321 enters the first muffler 210 through the third vent 324 and the first vent 311, while another part of the gas enters the first cavity 141 through the first vent 322 and then re-enters the intake cavity 321. Similarly, when the third vent 324 is connected to the second vent 312, the inner wall of the groove 313 blocks the first vent 322. At this time, the second vent 323 is connected to the first cavity 141. Part of the gas in the intake cavity 321 enters the second muffler 220 through the third vent 324 and the second vent 312, while another part of the gas enters the first cavity 141 through the second vent 323 and then re-enters the intake cavity 321. This structural design can reduce the internal pressure of the first cavity 141 and also reduce the pressure between the distribution component 320 and the first partition 310.

[0064] It should be noted that the specific structure and noise elimination principle of the first silencer 210 and the second silencer 220 are conventional technologies in the field. For example, Figures 1 to 8 As shown, the first silencer pipe 210 includes a first pipe body 211 and a first silencer component 212. The first pipe body 211 is connected to the first vent 311 and passes through the first silencer component 212. The first silencer component 212 is filled with a sound-absorbing material that absorbs low-frequency noise. The second silencer pipe 220 includes a second pipe body 221 and a second silencer component 222. The second pipe body 221 is connected to the second vent 312 and passes through the second silencer component 222. The second silencer component 222 is filled with a sound-absorbing material that absorbs mid-to-high-frequency noise. The sound-absorbing materials filled in the first silencer component 212 and the second silencer component 222 are common materials in the art and will not be described in detail here.

[0065] Preferably, such as Figures 1 to 8 As shown, the first silencing component 212 is located within the second cavity 142, and the second silencing component 222 is located within the third cavity 143. The first cavity 141, the third cavity 143, and the fourth cavity 144 are all expansion cavities, while the second cavity 142 is a resonant cavity, in order to improve the silencing effect of the first silencing pipe 210 and the second silencing pipe 220. The specific structures of the expansion cavities and the resonant cavities are common in the art and will not be described in detail here.

[0066] This embodiment also provides a vehicle capable of eliminating noise of different frequencies within the exhaust pipe.

[0067] Specifically, the vehicle includes an exhaust pipe and the aforementioned muffler. The air intake 121 is connected to the exhaust pipe. By using the aforementioned muffler, the air intake 121 of the muffler is connected to the vehicle's exhaust pipe, thereby eliminating noise of different frequencies in the exhaust pipe and improving the vehicle's NVH characteristics.

[0068] Furthermore, such as Figures 1 to 8 As shown, the vehicle also includes an engine (not shown) and an electronic control unit (ECU). The engine and the distribution assembly are respectively connected to the ECU 10 via control wiring harness 20. The ECU 10 is used to monitor the operating conditions of the engine, and the ECU 10 can control the drive component 330 according to the monitored operating conditions, so that the drive component 330 drives the distribution component 320 to rotate, so that the air intake 121 can selectively connect with at least one of the first muffler pipe 210 and the second muffler pipe 220, so as to meet the muffler requirements of the engine under different operating conditions and achieve the effect of intelligent muffler.

[0069] This embodiment also provides a muffler control method that can precisely reduce noise from the exhaust pipe according to different operating conditions of the vehicle engine.

[0070] Specifically, such as Figures 1 to 9 As shown, the muffler control method is applied to the aforementioned vehicle. The noise frequency that the first muffler 210 can eliminate is less than the noise frequency that the second muffler 220 can eliminate. Specifically, the first muffler 210 is used to eliminate low-frequency noise, and the second muffler 220 is used to eliminate mid-to-high-frequency noise. The vehicle also includes an engine with a rated power of Pe and an output power of P. The muffler control method includes: when the engine is idling, the air intake 121 is connected to the first muffler 210, and the connection between the air intake 121 and the second muffler 220 is disconnected; when P < 30% × Pe, the air intake 121 is connected to the first muffler 210, and the connection between the air intake 121 and the second muffler 220 is disconnected; when P ≥ 30% × Pe, the air intake 121 is connected to the second muffler 220.

[0071] Based on the above design, when the vehicle engine is idling or the engine output power is less than 30% of the rated power, the exhaust pipe noise is mainly low-frequency noise. At this time, the first muffler 210 is used to reduce the noise of the exhaust pipe. When the vehicle engine output power is greater than or equal to 30% of the rated power, the exhaust pipe noise is mainly mid-to-high frequency noise. At this time, the second muffler 220 is used to reduce the noise of the exhaust pipe. In this way, the noise of different frequencies can be reduced, achieving the purpose of precise noise reduction, improving the sound absorption effect of the muffler, and providing a strong guarantee for improving the NVH characteristics of the vehicle.

[0072] Preferably, such as Figures 1 to 9 As shown, the muffler control method also includes: when P≥45%×Pe, the exhaust pipe noise is mainly mid-to-high frequency noise, and the air flow in the exhaust pipe is very large. At this time, the first muffler pipe 210 and the second muffler pipe 220 are both connected to the air inlet 121. The mid-to-high frequency noise in the exhaust pipe is eliminated by the second muffler pipe 220. At the same time, the gas in the exhaust pipe flows through the first muffler pipe 210 and the second muffler pipe 220 respectively to reduce the back pressure of the muffler and keep the back pressure of the muffler at a low level. When 30%×Pe≤P<45%×Pe, the exhaust pipe noise is mainly mid-to-high frequency noise, and the air flow in the exhaust pipe is much smaller than when P≥45%×Pe. Therefore, it is only necessary to use the second muffler 220 to eliminate the mid-to-high frequency noise, and there is no need for the first muffler 210 to divert the exhaust. Therefore, when 30%×Pe≤P<45%×Pe, the air inlet 121 is connected to the second muffler 220, and the connection between the air inlet 121 and the first muffler 210 is disconnected.

[0073] Because the noise frequency and energy of the exhaust pipe vary under different operating conditions of the vehicle engine, the muffler control method provided in this embodiment is applied to vehicles using the aforementioned muffler. It can precisely suppress noise at different frequencies in the exhaust pipe, thereby improving the vehicle's NVH characteristics. The following is a brief explanation using the example of the first air outlet 322 being connected to the first air outlet 311 and the second air outlet 323 being connected to the second air outlet 312 when the motor is reset:

[0074] See Figures 1 to 9After the vehicle starts, the ECU10 monitors the engine's operating condition. When the ECU10 detects the engine idling speed or the engine's output power P is less than 30% of the rated power Pe, the exhaust noise is mainly low-frequency noise. The ECU10 controls the forward motor to be energized, causing the forward motor to drive the first connecting shaft 350 to move linearly. The first connecting shaft 350 drives the connecting arm 340 and the distributor 320 to rotate, so that the third exhaust port 324 is connected to the first air port 311. The outer wall of the distributor 320 blocks the second air port 312, realizing the connection between the intake port 121 and the first air port 311. At this time, the gas in the exhaust pipe passes through the intake port 121, the first cavity 141, the intake cavity 321, the third exhaust port 324 and the first air port 311 in sequence, and then enters the first muffler 210 to eliminate low-frequency noise. Finally, it is discharged from the other end of the first muffler 210.

[0075] When ECU10 detects that 30%×Pe≤P<45%×Pe, the noise from the exhaust pipe is mainly mid-to-high frequency noise. ECU10 controls the advance motor to be energized in reverse, causing the advance motor to drive the first connecting shaft 350 to move in a straight line in the opposite direction. The first connecting shaft 350 drives the connecting arm 340 and the distributor 320 to rotate in the opposite direction, so that the third exhaust port 324 is connected to the second air port 312. The outer wall of the distributor 320 blocks the first air port 311, realizing the connection between the intake port 121 and the second air port 312. At this time, the gas in the exhaust pipe passes through the intake port 121, the first cavity 141, the intake cavity 321, the third exhaust port 324 and the second air port 312 in sequence, and then enters the second muffler 220 to eliminate mid-to-high frequency noise, and finally exits from the other end of the second muffler 220.

[0076] When ECU10 detects P≥45%×Pe, the exhaust pipe noise is mainly mid-to-high frequency noise, and the exhaust emission is at its maximum. ECU10 controls the stepper motor to power on and reset. The stepper motor drives the first connecting shaft 350 to move linearly, and the first connecting shaft 350 drives the connecting arm 340 and the distributor 320 to rotate, so that the first exhaust port 322 connects with the first air port 311, the second exhaust port 323 connects with the second air port 312, and the bottom of the groove 313 seals the third exhaust port 324. This allows the air inlet 121 to be connected to both the first air hole 311 and the second air hole 312. At this time, the gas in the exhaust pipe passes through the air inlet 121, the first cavity 141 and the air inlet cavity 321 in sequence. Part of the gas then passes through the second air outlet 323 and the second air hole 312 and enters the second muffler 220 to eliminate mid-to-high frequency noise. The other part passes through the first air outlet 322 and the first air hole 311 and enters the first muffler 210. Then, the gas is discharged from the muffler through the first muffler 210 to reduce the back pressure of the muffler.

[0077] When the ECU10 detects that the vehicle is off, the ECU10 controls the stepper motor to be powered on and reset, so that the first air outlet 322 is connected to the first air outlet 311 and the second air outlet 323 is connected to the second air outlet 312, waiting for the next vehicle start.

[0078] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A silencer, characterized in that, include: A housing (100) having an air inlet (121); A dispensing assembly disposed within the housing (100); A first silencer (210) and a second silencer (220) are provided for eliminating noise of different frequencies. The air inlet (121) is selectively connected to at least one of the first silencer (210) and the second silencer (220) via the distribution assembly. The dispensing assembly includes a first partition (310), a dispensing component (320), and a driving component (330). The first partition (310) is disposed within the housing (100). The first partition (310) has a first vent (311) and a second vent (312). The first silencer pipe (210) and the second silencer pipe (220) are located on the same side of the first partition (310), and the first silencer pipe (210) and the second silencer pipe (220) are respectively connected to the first vent (311) and the second vent (312). The distribution member (320) is provided with an air inlet chamber (321), which is connected to the air inlet (121). The distribution member (320) is movably connected to the side of the first partition (310) away from the first silencer pipe (210). As the distribution member (320) moves, the air inlet chamber (321) can selectively communicate with at least one of the first air hole (311) and the second air hole (312). The driving member (330) is used to drive the distribution member (320) to move relative to the first partition (310). The distribution component (320) is further provided with a first air outlet (322), a second air outlet (323), and a third air outlet (324). The first air outlet (322), the second air outlet (323), and the third air outlet (324) are all connected to the air inlet chamber (321). The third air outlet (324) is located between the first air outlet (322) and the second air outlet (323). The first air outlet (322) and the second air outlet (323) are respectively connected to the first air outlet (311) and the second air outlet (312). 2) When connected, the third vent (324) is disconnected from the first vent (311) and the second vent (312). When the third vent (324) is connected to the first vent (311), the first vent (322) and the second vent (323) are disconnected from the second vent (312). When the third vent (324) is connected to the second vent (312), the first vent (322) and the second vent (323) are disconnected from the first vent (311). The first partition plate (310) has a groove (313) on the side opposite to the first silencer pipe (210). The first air hole (311) and the second air hole (312) are spaced apart on the inner wall of the groove (313). The distribution member (320) is fitted and rotatably disposed in the groove (313). The first air outlet (322), the third air outlet (324), and the second air outlet (323) rotate around the distribution member (320). The third air outlet (324) is axially distributed, and its diameter is less than or equal to the distance between the first air outlet (311) and the second air outlet (312). When the third air outlet (324) is connected to the first air outlet (311), the outer wall of the distribution member (320) blocks the second air outlet (312). When the third air outlet (324) is connected to the second air outlet (312), the outer wall of the distribution member (320) blocks the first air outlet (311). The first partition (310) divides the housing (100) into a first cavity (141), the air inlet (121) is located on the cavity wall of the first cavity (141), the distribution member (320) is located in the first cavity (141), the air inlet cavity (321) is an open cavity, and the air inlet cavity (321) is connected to the air inlet (121) through the first cavity (141); When the third vent (324) is connected to the first vent (311), the inner wall of the groove (313) blocks the second vent (323). At this time, the first vent (322) is connected to the first cavity (141). Part of the gas in the air inlet (321) enters the first silencer (210) through the third vent (324) and the first vent (311), and another part of the gas enters the first cavity (141) through the first vent (322) and then enters the air inlet (321) again. When the third vent (324) is connected to the second vent (312), the inner wall of the groove (313) blocks the first vent (322). At this time, the second vent (323) is connected to the first cavity (141). Part of the gas in the air inlet (321) enters the second silencer (220) through the third vent (324) and the second vent (312), and another part of the gas enters the first cavity (141) through the second vent (323) and then enters the air inlet (321) again.

2. The silencer according to claim 1, characterized in that, The dispensing assembly further includes a connecting arm (340) and a first connecting shaft (350). The connecting arm (340) is connected to the dispensing member (320). The connecting arm (340) is provided with a strip hole (341). The extension direction of the strip hole (341) is perpendicular to the axis of rotation of the dispensing member (320). The first connecting shaft (350) passes through the strip hole (341) and slides with the strip hole (341). The first connecting shaft (350) is connected to the driving end of the driving member (330). The driving member (330) can drive the first connecting shaft (350) to reciprocate linearly.

3. A vehicle, characterized in that, Includes an exhaust pipe and a muffler as described in any one of claims 1-2, wherein the air inlet (121) is in communication with the exhaust pipe.

4. The vehicle according to claim 3, characterized in that, The vehicle also includes an engine and an ECU (10), both of which are signal-connected to the ECU (10). The ECU (10) is used to monitor the operating conditions of the engine and control the distribution assembly to selectively connect the air intake (121) to at least one of the first muffler (210) and the second muffler (220).

5. A muffler control method, applied to the vehicle as described in claim 3 or 4, characterized in that, The first muffler (210) is used to eliminate low-frequency noise, and the second muffler (220) is used to eliminate mid-to-high-frequency noise. The vehicle also includes an engine with a rated power of Pe and an output power of P. The muffler control method includes: When the engine is idling, the air intake (121) is connected to the first muffler (210), and the connection between the air intake (121) and the second muffler (220) is disconnected. When P < 30% × Pe, the air inlet (121) is connected to the first muffler (210), and the connection between the air inlet (121) and the second muffler (220) is disconnected; When P ≥ 30% × Pe, the air inlet (121) is connected to the second silencer pipe (220).

6. The muffler control method according to claim 5, characterized in that, The muffler control method further includes: When 30%×Pe≤P<45%×Pe, disconnect the connection between the air inlet (121) and the first silencer pipe (210); When P ≥ 45% × Pe, the air inlet (121) is connected to the first silencer pipe (210).

Images