Exhaust pipe and control method

Abstract

The invention relates to the technical field of automobile exhaust pipe structures, in particular to an exhaust pipe and a control method. Comprising a silencing pot, two groups of first tail pipes, a second tail pipe, a sound acquisition unit and a sound playing unit, the silencing pot is a hollow cavity communicated with an air inlet pipe, and a plurality of partition plates are arranged in the silencing pot to divide the internal space of the silencing pot into a plurality of silencing chambers which are communicated with one another; the two tail pipes are arranged on the two axial sides of the silencing pot respectively, the inlet end of the first tail pipe extends into a silencing cavity in the silencing pot, and the outlet end of the first tail pipe is located on one axial side of the silencing pot. The inlet end of the first tail pipe extends into a silencing cavity in the silencing pot, the outlet end of the first tail pipe is located on one side of the silencing pot in the axial direction, and a control valve for controlling the second tail pipe to be connected and disconnected is arranged on the second tail pipe. The sound acquisition unit is arranged on one side of the silencing pot; the sound playing unit is arranged on the other side of the silencing pot. The exhaust pipe is simple in structure, the exhaust sound effect can be actively controlled, and individual requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of automobile exhaust pipe structures, in particular to an exhaust pipe and a control method. Background Art

[0002] With the rich models in the automobile market and the increasing demand for personalized vehicle acoustics by consumers, more personalized muffler solutions have begun to be applied. For SUV models, many use multi-link rear suspension to improve the comfort of the whole vehicle. The layout space of the exhaust muffler under the chassis is limited. The horizontal rear-stage muffler is used to increase the volume of the muffler, so as to improve the noise reduction ability of the muffler under the limited exhaust resistance. At the same time, the double tail pipe form is used to further reduce the noise of the exhaust tail pipe mouth. The noise performance is much higher than the national standard passing noise performance requirements. At the same time, consumers hope that when driving SUV models on suburban roads during weekend tours, on highways for medium and long-distance round-trip travel to visit relatives, and on self-driving tours in Xinjiang and other places during long holidays, the exhaust tail pipe mouth can emit a surging and powerful sound, and the vehicle will be more powerful and economical. At the same time, when returning to the urban areas where they live, they can have good exhaust system muffler noise reduction capabilities.

[0003] At present, the design of sports exhaust sounds in China usually adopts the following principle: two exhaust passages are designed in the rear muffler, which are controlled by active valves. When the valve is opened, it is the sound mode, and the gas is preferentially discharged from the exhaust passage with lower back pressure to produce a sound effect. When the valve is closed, it is the silent mode, and the gas is discharged after being silenced inside the muffler package.

[0004] The Chinese utility model patent with the patent number of "CN220791351U" and the name of "A kind of automobile sound exhaust device" proposes an exhaust device, which includes an intake pipe, a silencer bag, a silencer pipe and a sound wave pipe. A sound wave chamber is formed in the silencer bag. One end of the intake pipe extending into the silencer bag is connected to the sound wave chamber. One end of the sound wave pipe extending into the silencer bag is connected to the intake pipe. One end of the sound wave pipe extending into the silencer bag is connected to the sound wave chamber. A valve is provided on the sound wave pipe. The silencer bag is provided with a plurality of criss-cross partitions. The plurality of partitions divide the sound wave chamber of the silencer bag into a plurality of chambers. A plurality of through holes are provided on the longitudinally arranged partitions to connect the plurality of chambers in sequence. The intake pipe is connected to one of the chambers, and the sound wave pipe is connected to the other chamber. The exhaust device introduced in the patent has multiple modes. In the silent mode, the valve is closed, and the automobile exhaust enters the intake pipe, flows in the silencer chamber, and finally is discharged from the silencer pipe to achieve the effect of silent silence. In the sound wave mode, the valve is opened, and the automobile exhaust enters the intake pipe, and a part of the gas repeats the emission path of the automobile exhaust in the silent mode, and the other part of the automobile exhaust enters the high-frequency pipe, and after the high-frequency noise is eliminated by the high-frequency pipe, it is discharged through the second air pipe to produce medium and low frequency sound waves. The exhaust pipe can achieve the effect of silence and sound waves by controlling the on and off of a single valve, but in actual application, it is difficult to achieve the expected effect by controlling the sound waves only by the on and off of the valve. The sound wave control of the device is passively adjusted, that is, it is completely dependent on the gas passing through the high-frequency pipe for adjustment. This adjustment effect is extremely limited, and it is difficult to achieve the ideal effect, which is not suitable for promotion and application. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide an exhaust pipe and a control method.

[0006] The technical solution of the present invention is: an exhaust pipe, including an air intake pipe, and further comprising:

[0007] A muffler, which is a hollow cavity connected to the air intake pipe, and a plurality of partitions are arranged inside the muffler to divide the internal space of the muffler into a plurality of mutually connected muffler chambers;

[0008] Two groups of first tail pipes, the two groups of tail pipes are respectively arranged on both sides of the axial direction of the muffler, the inlet end of the first tail pipe extends into the muffler chamber in the muffler, and the outlet end is located on one side of the axial direction of the muffler;

[0009] A second tail pipe, wherein the inlet end of the first tail pipe extends into the muffler chamber in the muffler, the outlet end is located on one axial side of the muffler, and the second tail pipe is provided with a control valve for controlling the on and off of the second tail pipe;

[0010] A sound collecting unit, which is arranged on one side of the muffler and is used for the sound of the tail pipe outlet on one side of the muffler;

[0011] The sound playing unit is arranged on the other side of the muffler, and is used for receiving the sound collected by the sound collecting unit and emitting the required sound based on the collected sound.

[0012] According to an exhaust pipe provided by the present application, the sound collection unit includes a microphone arranged at the outlet end of the second tail pipe.

[0013] According to an exhaust pipe provided by the present application, the sound playing unit includes a speaker arranged at a position of an outlet end of a first tail pipe on a side of a muffler opposite to a second tail pipe.

[0014] According to an exhaust pipe provided in the present application, the partition inside the muffler divides the space inside the muffler into a central muffler chamber in the axial middle, side muffler chambers on both sides of the axial direction, and an intermediate muffler chamber between the central muffler chamber and the side central chamber; the intermediate muffler chamber is provided with muffler cotton which expands and fills the intermediate muffler chamber when the exhaust gas is heated.

[0015] An exhaust pipe provided according to the present application also includes a connecting pipe arranged in the muffler and connected to the first tail pipe; the connecting pipe extends from the side muffler chamber on one side to the side muffler chamber on the other side along a parallel axial direction, and the connecting pipe passes through the muffler cotton on both sides so that the muffler cotton is wrapped around the outside of the pipe body, and a plurality of small holes are evenly opened on the connecting pipe.

[0016] An exhaust pipe provided according to the present application also includes a high-frequency tube arranged in the muffler to connect the first tail pipe and the connecting pipe; the high-frequency tube is a hollow pipe arranged along a parallel axial direction, the high-frequency tube is filled with sound-absorbing cotton, and a plurality of small holes are evenly opened on the tube wall of the high-frequency tube.

[0017] According to an exhaust pipe provided in the present application, small holes are evenly distributed on the partition, and adjacent muffler chambers are connected through the small holes on the partition.

[0018] An exhaust pipe provided according to the present application also includes an intermediate pipe arranged in an intermediate silencer chamber; the intermediate pipe is arranged along a parallel axial direction and passes through the silencer cotton in the intermediate silencer chamber so that the silencer cotton is wrapped around the outside of the pipe body, a plurality of small holes are evenly distributed on the pipe body of the intermediate pipe, and one end of the intermediate pipe is connected to the central silencer chamber.

[0019] An exhaust pipe provided according to the present application also includes a conducting pipe; the conducting pipe is a pipeline structure arranged in the side silencer chamber, one end of the conducting pipe is connected to the second tail pipe, and the other end is connected to the middle pipe close to the second tail pipe, and a plurality of small holes are evenly distributed on the pipe body of the conducting pipe.

[0020] According to an exhaust pipe provided by the present application, the control valve is a valve with multiple openings and can change the sound of the second tail pipe outlet by controlling the opening.

[0021] The present application also provides an exhaust pipe control method, the control method is used to control the above-mentioned exhaust pipe, comprising:

[0022] Identify the current driving environment and receive control instructions;

[0023] When receiving the command to switch to the normal mode, a closing command is sent to the control valve, so that the exhaust gas from the intake pipe passes through the muffler and is discharged from the first tail pipes on both sides;

[0024] When the current driving environment meets the sound requirements and a command to switch to the sound mode is received, an opening command is sent to the control valve to allow the exhaust from the intake pipe to pass through the muffler and be discharged from the first tail pipe and the second tail pipe on both sides. The sound collection unit collects the sound at the tail pipe outlet, and the sound playback unit receives the sound collected by the sound collection unit and emits the required sound based on the collected sound.

[0025] According to an exhaust pipe control method provided by the present application, the method for identifying the current driving environment includes: taking the vehicle as the center, identifying buildings within a set distance around the vehicle, if there are no buildings within the set distance, it is considered that the current driving environment meets the sound requirements, otherwise it does not meet the sound requirements.

[0026] According to an exhaust pipe control method provided by the present application, a sound collecting unit collects sound from the outlet of the second tail pipe, and a sound playing unit receives the sound collected by the sound collecting unit and emits a sound wave same as the collected sound.

[0027] The advantages of the present application are as follows: 1. The exhaust pipe structure of the present application is simple. By setting a sound collection unit and a sound playback unit, the corresponding sound wave sound can be automatically played based on the sound of the tail pipe outlet. The sound wave sound is fully controllable and can perfectly achieve the desired effect and meet different personalized requirements; the present application sets two groups of first tail pipes and one group of second tail pipes. In the normal mode, the exhaust gas is discharged through the two groups of first tail pipes, and the air flow path is long and the resistance is large, so that a good mute effect can be achieved. In the sound wave mode, the valve is controlled to be opened, and the exhaust gas is mainly discharged through the second tail pipe. The air flow path is short and the resistance is small, and a sound with a good sound wave effect is emitted to meet the sound wave requirements;

[0028] 2. The present application sets a microphone at the outlet of the second tail pipe, and collects the sound at the outlet of the second tail pipe based on the microphone, so that the real sound of the second tail pipe in the sound wave mode can be obtained, which is convenient for the subsequent control of the sound playback unit, so that the final sound wave sound is more in line with the demand;

[0029] 3. The present application sets a loudspeaker on the side relative to the second tail pipe, and uses the loudspeaker to emit the corresponding sound waves, so that the same sound waves can be emitted on both sides of the muffler, and the sound wave effect formed is more significant, and the sound wave effect on both sides is more uniform, which further meets the personalized needs;

[0030] 4. The present application sets a plurality of partitions in the muffler, and uses the partitions to divide the muffler into a plurality of muffler chambers, so that the exhaust gas from the intake pipe can collide repeatedly in the muffler, achieving a good muffler effect. At the same time, the muffler cotton can expand and fill the muffler chamber when the exhaust temperature rises, further absorbing the sound energy of the exhaust gas and reducing the decibel of the sound;

[0031] 5. The present application sets a connecting pipe in the muffler, which significantly extends the length of the path for the exhaust gas to enter the first tail pipe from the intake pipe. The connecting pipe also increases the complexity of the structure in the muffler, making the gas flow more turbulent, further increasing the gas flow resistance, and achieving a good noise reduction and silencing effect;

[0032] 6. The present application sets a high-frequency tube in the muffler, and the high-frequency tube is filled with muffler cotton, which can further dissipate the energy of the gas discharged from the connecting pipe, eliminate the high-frequency part of the exhaust sound, reduce the exhaust sound, and significantly reduce the decibel of the exhaust sound entering the first tail pipe;

[0033] 7. The present application provides uniform small holes on the partition, which, on the one hand, facilitates the flow of gas in the muffler chamber, and on the other hand, can increase the resistance of gas flow by providing small holes, further reduce the sound energy generated by the gas, and reduce the exhaust sound;

[0034] 8. The present application also provides an intermediate pipe in the muffler, which facilitates the connection between the central muffler chamber and the muffler chambers on both sides, making the gas flow smoother. When switching to the sound wave mode, the length of the gas flow path can be reduced, so that the exhaust sound wave effect of the second tail pipe is better;

[0035] 9. The present application sets a conducting pipe between the middle pipe and the second tail pipe, which further reduces the length of the gas flow path between the intake pipe and the second tail pipe. When switching to the sound wave mode, the gas can quickly enter the second tail pipe, producing a good sound wave effect to meet personalized needs;

[0036] 10. The control valve of the present application can achieve the change of the exhaust sound of the second tail pipe by adjusting the opening. In actual application, the required opening can be selected and adjusted according to the needs to achieve different exhaust sound effects, and the sound effect is richer;

[0037] 11. The exhaust pipe control method of the present application is very simple. It controls the control valve by identifying the current driving environment and control instructions, switches the mode, achieves different required effects, and meets different needs;

[0038] 12. This application identifies surrounding buildings before switching modes to avoid disturbing people when switching to sound mode when there are many buildings around;

[0039] 13. The present application collects the exhaust sound of the second tail pipe, and then plays the same sound based on the collected sound, so that the sound is more balanced and the sound effect is better.

[0040] The exhaust pipe of the present application has a simple structure, can be switched between normal mode and sound mode, actively controls the exhaust sound effect, meets personalized needs, has little adjustment restriction, can easily achieve the ideal sound effect, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 : Schematic diagram of the exhaust pipe control structure of the present application;

[0042] Figure 2 : Schematic diagram of the exhaust pipe structure of the present application;

[0043] Figure 3 : Schematic diagram of the internal structure of the exhaust pipe of the present application;

[0044] Among them: 1—intake pipe; 2—muffler; 3—partition; 4—first tail pipe; 5—second tail pipe; 6—microphone; 7—speaker; 8—silencer cotton; 9—connecting pipe; 10—high frequency pipe; 11—middle pipe; 12—conducting pipe; 13—control valve. DETAILED DESCRIPTION

[0045] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0046] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] The present application relates to an exhaust pipe. Compared with the exhaust pipe on a traditional vehicle, the exhaust pipe of the present application adds a tail pipe, and a control valve is installed on the added tail pipe. The control valve controls the on and off of the added tail pipe to achieve the switching effect of different modes. At the same time, the present application also adds a sound processing unit to the exhaust pipe. When the sound processing unit is switched to the sound wave mode, it collects the sound waves emitted by the exhaust pipe and plays the corresponding sound, so as to achieve a good sound wave effect and meet the personalized needs of the driver and passengers. The exhaust pipe of the present application is an active control strategy. Compared with the existing passive control strategy, the sound wave control effect of the present application is better, the sound wave adjustment is richer, and the effect achieved is more ideal.

[0050] Specifically, Figures 1 to 3 An exhaust pipe of the present application includes an intake pipe 1, a muffler 2, two groups of first tail pipes 4, a second tail pipe 5, a sound collection unit and a sound playback unit; the muffler 2 is a hollow cavity connected to the intake pipe 1, and a plurality of partitions 3 are arranged in the muffler 2 to divide the internal space of the muffler 2 into a plurality of mutually connected muffler chambers; the two groups of tail pipes are arranged on both axial sides of the muffler 2, the inlet end of the first tail pipe 4 extends into the muffler chamber in the muffler 2, and the outlet end is located on one axial side of the muffler 2; the inlet end of the first tail pipe 4 extends into the muffler chamber in the muffler 2, and the outlet end is located on one axial side of the muffler 2, and the second tail pipe 5 is provided with a control valve 13 for controlling the on and off of the second tail pipe 5; the sound collection unit is arranged on one side of the muffler 2, and is used for the sound at the outlet of the tail pipe on one side of the muffler 2; the sound playback unit is arranged on the other side of the muffler 2, and is used to receive the sound collected by the sound collection unit and emit the required sound based on the collected sound.

[0051] The exhaust gas from the intake pipe 1 enters the muffler 2, and the exhaust gas flows in the muffler 2. The structure in the muffler 2 blocks and absorbs the exhaust gas, so that the flow rate of the exhaust gas is reduced, the energy of the exhaust gas is absorbed, and the sound generated by the exhaust gas is reduced. Finally, the exhaust gas is discharged from the first tail pipes 4 on both sides and enters the external environment. In the normal mode, the control valve 13 is closed, that is, the exhaust gas can only be discharged through the first tail pipes 4 on both sides. When switching to the sound wave mode, the control valve 13 is opened, and the exhaust gas is not only discharged from the first tail pipes 4 on both sides, but also from the second tail pipe 5. Under the control of the control valve 13, the exhaust gas from the second tail pipe 5 emits a sound wave sound. At this time, the sound collection unit will collect the emitted sound wave sound, and then the sound playback unit will play the required sound wave sound based on the collected sound wave sound. That is to say, in the sound mode of the present application, the sound finally emitted is a combination of the sound emitted by the second tail pipe 5 and the sound played by the sound playing unit. The final sound is based on the sound emitted by the second tail pipe 5, and is not completely separated from the sound emitted by the exhaust pipe. However, it can be actively corrected and adjusted based on the sound emitted by the exhaust pipe to produce rich sound effects and meet personalized needs.

[0052] In actual control, follow the steps below:

[0053] S1, identifying the current driving environment and receiving control instructions;

[0054] The exhaust pipe is controlled based on the control command. Only after the corresponding control command is sent to the exhaust pipe, the control valve 13 is operated to switch the exhaust mode.

[0055] Identifying the current driving environment is mainly to avoid unnecessary interference to the surrounding living environment. For example, if there are hospitals or schools around the driving road, if the sound wave mode is turned on at this time, a loud sound will cause unnecessary interference to such places. By identifying the driving environment, interfering noise can be avoided in such places.

[0056] S2, when receiving the command to switch to the normal mode, sending a closing command to the control valve 13, so that the exhaust gas from the intake pipe 1 passes through the muffler 2 and is discharged from the first tail pipes 4 on both sides;

[0057] In the normal mode, the control valve 13 is closed, and the exhaust gas is not discharged from the second tail pipe 5, but only discharged from the two groups of first tail pipes 4 on both sides of the muffler 2. Since the exhaust gas flows in the muffler 2, the exhaust gas is blocked by the structure in the muffler 2, and the exhaust energy is absorbed by the structure in the muffler 2. Finally, the sound generated by the gas discharged from the first tail pipe 4 is very small. In the normal mode, the exhaust sound has a good silencing effect;

[0058] When the current driving environment meets the sound requirements and a command to switch to the sound mode is received, an opening command is sent to the control valve 13, so that the exhaust of the intake pipe 1 passes through the muffler 2 and is discharged from the first tail pipe 4 and the second tail pipe 5 on both sides, the sound collection unit collects the sound at the tail pipe outlet, and the sound playback unit receives the sound collected by the sound collection unit and emits the required sound based on the collected sound;

[0059] In the sound wave mode, after the exhaust gas enters the muffler 2, it will be discharged from the first tail pipe 4 and the second tail pipe 5. Since the gas flow path formed by the second tail pipe 5 of the present application is relatively short (equivalent to the gas flow path formed by the first tail pipe 4), most of the exhaust gas will be discharged from the second tail pipe 5. The discharge path is very short and the resistance is small, and the exhaust gas will form a sound wave effect. In this process, the sound collection unit collects the sound wave sound, and the sound playing unit plays the sound wave sound, forming a good sound wave effect to meet personalized needs.

[0060] Embodiment 1: This embodiment optimizes the above-mentioned sound collection unit and sound playback unit. Specifically, Figure 1 As shown, the sound collection unit of this embodiment includes a microphone 6 arranged at the outlet end of the second tail pipe 5, and the sound playing unit includes a speaker 7 arranged at the outlet end of the first tail pipe 4 on the side of the muffler 2 opposite to the second tail pipe 5.

[0061] In this embodiment, a microphone 6 is directly arranged at the outlet of the second tail pipe 5. The microphone 6 is used to collect the sound at the outlet of the second tail pipe 5. The speaker 7 plays the sound based on the sound collected by the microphone 6. The corresponding description is also made in the previous text. Since the exhaust gas of the intake pipe 1 will be discharged from the first tail pipe 4 on both sides and the second tail pipe 5 after passing through the muffler 2 when switching to the sound mode, more gas is discharged from the second tail pipe 5. The gas discharged from the second tail pipe 5 has a short flow path and small resistance, and the sound emitted is louder, producing a stronger sound. The microphone 6 collects the sound generated by the second tail pipe 5, and then converts it into an electrical signal and transmits it to the speaker 7. After receiving the corresponding electrical signal, the speaker 7 converts it into the same sound as the sound emitted by the second tail pipe 5. In this way, sound will be emitted on both sides of the muffler 2, and the sound on both sides of the muffler 2 is more balanced, and the sound effect formed is better, which is more in line with the requirements of the driver and passengers.

[0062] Since the sound waves emitted by the speaker 7 of the present embodiment are based on the sound collected by the microphone 6 from the second tail pipe 5, they are completely consistent with the exhaust pipe and are not completely generated out of thin air. They conform to the working state of the exhaust pipe and the actual operation of the car. Therefore, the sound waves generated are closer to the real driving scene and meet the needs of the driver and passengers.

[0063] Embodiment 2: This embodiment optimizes the structure of the muffler 2. Specifically, Figure 3 As shown, the partition 3 in the muffler 2 divides the space inside the muffler 2 into a central muffler chamber in the middle of the axial direction, side muffler chambers on both sides of the axial direction, and an intermediate muffler chamber between the central muffler chamber and the side central chamber. The muffler 2 of this embodiment includes a central muffler chamber, two groups of intermediate muffler chambers on both sides of the central muffler chamber in the axial direction, and two groups of side muffler chambers, that is, a total of five groups of muffler chambers are arranged in the muffler 2 of this embodiment.

[0064] The silencer 2 is a stainless steel plate with a wall thickness of 1 mm, which is formed into an elliptical cylinder by biting. The two sides of the elliptical cylinder are also biting. An air inlet with an outer diameter of D1+5 mm is stamped on the silencer 2 (connected to the air inlet pipe 1). The silencer 2 is provided with end covers at both axial ends. The left and right end covers are stainless steel plates with a wall thickness of 1 mm and an elliptical shape. There is a large circular hole on the left end cover (for connecting the first tail pipe 4 on the left side), and there are two large circular holes on the right end cover (for connecting the first tail pipe 4 and the second tail pipe 5 on the right side). The partition 3 is a stainless steel plate with a wall thickness of 1 mm and an elliptical shape. There are several large circular holes and several small holes of φ3.5 mm on it. Adjacent silencer chambers are connected to each other through the pin holes on the partition 3.

[0065] Among them, the middle silencer chamber is provided with silencer cotton 8 which expands and fills the middle silencer chamber when the exhaust gas is heated. The gas discharged into the silencer 2 by the intake pipe 1 is a very high temperature exhaust gas. After these exhaust gases enter the silencer 2, they will heat the silencer cotton 8. After the temperature of the silencer cotton 8 rises, it will expand and completely fill the middle silencer chamber. The silencer cotton 8 itself can absorb the energy of the exhaust gas and reduce the gas flow rate. Under the impact of the airflow, the silencer cotton 8 will rub against each other and absorb sound waves, thereby hindering the airflow from passing through the middle silencer chamber, achieving the effect of absorbing sound waves and reducing sound energy.

[0066] Embodiment 3: This embodiment further optimizes the internal structure of the muffler 2. Specifically, Figure 3 As shown, in this embodiment, a number of pipeline structures are arranged in the muffler 2, including a connecting pipe 9 arranged in the muffler 2 and connected with the first tail pipe 4, the connecting pipe 9 extends from one side muffler chamber to the other side muffler chamber in a parallel axial direction, the connecting pipe 9 passes through the muffler cotton 8 on both sides so that the muffler cotton 8 is wrapped around the outside of the pipe body, and a plurality of small holes are evenly opened on the connecting pipe 9.

[0067] One end of the connecting pipe 9 is located in the side muffler chamber on one side, and the other end is located in the side muffler chamber on the other side, which is equivalent to the connecting pipe 9 being a structure that runs through the entire muffler 2 in a parallel axial direction. The small holes provided on the connecting pipe 9 make the connecting pipe 9 and the muffler chamber mutually connected, and the gas entering the muffler chamber will enter the connecting pipe 9 through the small holes on the connecting pipe 9, and then finally flow into the first tail pipe 4 for discharge. In the process of entering the connecting pipe 9, the gas will be blocked by the connecting pipe 9, and part of the energy will also be absorbed, and the gas flow rate will be further reduced, so that the sound generated by the gas finally discharged from the first tail pipe 4 will be further reduced.

[0068] Each first tail pipe 4 corresponds to a connecting pipe 9. The connecting pipe 9 is a stainless steel pipe with a wall thickness of 1mm and an outer diameter of D1-12mm, with a number of small holes of φ3.5mm on it. The connecting pipe 9 plays a collecting role, which facilitates the gas to enter the first tail pipe 4 from the silencer chamber. The connecting pipe 9 is a pipeline structure fixed on the partition. The partition is provided with a circular hole corresponding to the connecting pipe 9. The connecting pipe 9 passes through the circular hole on the partition 3 and is fixedly connected to the partition 3. In addition, the connecting pipe 9 of this embodiment passes through the silencer cotton 8. The silencer cotton 8 can play a certain shock-absorbing role on the connecting pipe 9. The gas flowing into the connecting pipe 9 may cause the connecting pipe 9 to vibrate. This part of the vibration is dissipated through the partition 3 on the one hand, and the silencer cotton 8 on the other hand.

[0069] The first tail pipe 4 and the connecting pipe 9 are connected via a high-frequency tube 10. Figure 3 As shown, the high-frequency tube 10 is a hollow pipe arranged in a parallel axial direction, filled with sound-absorbing cotton, and a plurality of small holes are evenly opened on the wall of the high-frequency tube 10. The high-frequency tube 10 is a stainless steel tube with an outer diameter of D1-2mm and a thickness of 1mm. The outer diameter of the two ends is D1-10mm after shrinking. There are a plurality of φ3.5mm small holes on the tube wall, and sound-absorbing cotton is attached to the inside of the tube wall.

[0070] The high-frequency tube 10 is used to absorb the high-frequency part of the sound. After the gas enters the high-frequency tube 10 from the silencing chamber and the connecting tube 9, it will be treated by the silencing cotton in the high-frequency tube 10 for energy dissipation. The silencing cotton will block the flow of the airflow, causing the flow rate of the airflow to decrease sharply, and finally the volume of the gas discharged into the first tail pipe 4 will be greatly reduced. There are small holes on the tube body of the high-frequency tube 10, which connect the internal and external spaces of the high-frequency tube 10. The flow of internal and external gases will intensify the mutual collision between the gases, dissipate the energy faster, and achieve better silencing effect.

[0071] In actual operation, the air inlet pipe 1 discharges gas into the muffler 2. After the gas enters the muffler 2, it first enters the central muffler chamber, then diffuses in the central muffler chamber, and diffuses to the middle muffler chamber and the side muffler chamber through the small holes on the partition 3 until all the muffler chambers are completely filled. At the same time, the gas entering the central muffler chamber and the middle muffler chamber will also enter the connecting pipe 9 through the small holes on the connecting pipe 9. The gas entering the connecting pipe 9 will flow to the corresponding high-frequency tube 10, and pass through the muffler cotton in the high-frequency tube 10. After the energy absorption and noise reduction operation, the gas is discharged from the first tail pipe 4. During this process, the gas in the side silencer chamber will also enter the high-frequency tube 10 through the small holes on the high-frequency tube 10, and collide with the gas in the high-frequency tube 10 to further dissipate energy; the gas entering the middle silencer chamber will heat the silencer cotton 8, and the heated silencer cotton 8 will expand rapidly to fill the corresponding middle silencer chamber. When the gas flows in the middle silencer chamber, the silencer cotton 8 will hinder the flow of the gas, and the gas flow rate will drop sharply, and finally all of them will be gathered in the middle connecting pipe 9.

[0072] Embodiment 4: This embodiment optimizes the internal structure of the muffler 2. Specifically, Figure 3 As shown, an intermediate tube 11 is provided in the silencer 2 of this embodiment. The intermediate tube 11 is arranged along a parallel axial direction and passes through the silencer cotton 8 in the intermediate silencer chamber so that the silencer cotton 8 is wrapped around the outside of the tube body. A plurality of small holes are evenly distributed on the tube body of the intermediate tube 11, and one end of the intermediate tube 11 is connected to the central silencer chamber.

[0073] The intermediate pipe 11 is a transition structure. On the one hand, it is to make the gas flow between the intermediate muffler chamber and the central muffler chamber smoother and facilitate the diffusion of gas between two adjacent muffler chambers; on the other hand, it is convenient to connect the central muffler chamber with the second tail pipe 5. The specific connecting structure is as follows: Figure 3 As shown, it also includes a conducting pipe 12, which is a pipeline structure arranged in the side silencer chamber. One end of the conducting pipe 12 is connected to the second tail pipe 5, and the other end is connected to the middle pipe 11 close to the second tail pipe 5. A plurality of small holes are evenly distributed on the pipe body of the conducting pipe 12.

[0074] The gas discharged from the intake pipe 1 to the central silencer chamber of the muffler 2 will diffuse to the intermediate silencer chambers on both sides through the intermediate pipes 11 on both sides. The intermediate pipe 11 close to the second tail pipe 5 will discharge the collected gas to the conducting pipe 12, and the conducting pipe 12 will then discharge the gas into the second tail pipe 5. The gas path formed in this way is relatively short, from the intake pipe, the central silencer chamber, the intermediate pipe 11, the conducting pipe 12 to the second tail pipe 5. Compared with the gas path of the first tail pipe 4, this gas path is short and the gas flow resistance is small, and the exhaust noise finally formed is obvious.

[0075] The intermediate pipe 11 of this embodiment is a thin-walled stainless steel round pipe with an outer diameter of D1+5mm and a wall thickness of 1mm. The intermediate pipe 11 is located in the intermediate muffler chamber and is fixedly connected to the partitions 3 on both sides of the intermediate muffler chamber. In actual use, the intermediate pipe 11 and the conducting pipe 12 near the second tail pipe 5 are an integral structure, and the length of the formed pipeline structure is twice that of the intermediate pipe 11 far from the second tail pipe 5. A plurality of φ3.5mm small holes are provided on the intermediate pipe 11 and the conducting pipe 12, and the total area of ​​the small holes on the intermediate pipe 11 and the conducting pipe 12 is equal to the area of ​​the circular hole with a diameter of D1.

[0076] Embodiment 5: This embodiment optimizes the structure of the control valve 13 described above. Specifically, the control valve 13 of this embodiment is a valve with multiple openings, which can change the sound at the outlet of the second tail pipe 5 by controlling the opening.

[0077] The control valve 13 is connected to the vehicle control system, and the control system sends a control command to the control valve 13, and the control valve 13 acts according to the sent command. The control valve 13 has multiple openings, for example, the initial opening is 60°, and then it is increased or decreased according to ±10°, ±20° or ±30°, so as to form a sound wave effect with multiple levels.

[0078] The larger the opening of the control valve 13, the smaller the gas flow rate discharged from the second tail pipe 5, and the less obvious the sound wave effect is. On the contrary, the smaller the opening of the control valve 13, the larger the gas flow rate discharged from the second tail pipe 5, and the more obvious the sound wave effect is. By adjusting the opening of the control valve 13 in this way, the desired sound wave adjustment effect can be achieved.

[0079] In actual application, the control operation method of the exhaust pipe of the present application is: identify the current driving environment and receive control instructions, take the vehicle as the center, identify the buildings within the set distance of the vehicle (the set distance of the present application is 50m to 100m), if there are no buildings within the set distance, it is considered that the current driving environment meets the sound wave requirements, otherwise it does not meet the sound wave requirements, there are buildings within the set distance, which proves that there are settlements around, and rashly turning on the sound wave will cause noise interference to the surrounding settlements. In order to avoid this situation, the present application sets the recognition of the surrounding environment, and the present application detects the surrounding environment through a laser radar or a camera. The detection method is a prior art and will not be repeated here;

[0080] If there are no buildings within the set distance, the basic condition for turning on the sound mode is met. At this time, it is necessary to further determine whether the driver and passengers have the need to turn on the sound mode. If there is no corresponding demand, it is the normal mode. The working state of the exhaust pipe of this application in the normal mode is:

[0081] The air inlet pipe 1 discharges gas into the muffler 2. After the gas enters the muffler 2, it first enters the central muffler chamber, then diffuses in the central muffler chamber, diffuses to the middle muffler chamber and the side muffler chamber through the small holes on the partition 3, until all the muffler chambers are completely filled. At the same time, the gas entering the central muffler chamber and the middle muffler chamber will also enter the connecting pipe 9 and the middle pipe 11 through the small holes on the connecting pipe 9 and the middle pipe 11. The gas entering the connecting pipe 9 will flow to the corresponding high-frequency pipe 10, and the energy absorbed by the muffler cotton in the high-frequency pipe 10 After the noise reduction operation, the noise is discharged from the first tail pipe 4. During this process, the gas in the side silencer chamber will also enter the high-frequency tube 10 through the small holes on the high-frequency tube 10, and collide with the gas in the high-frequency tube 10 to further dissipate energy; the gas entering the middle silencer chamber will heat the silencer cotton 8, and the heated silencer cotton 8 will expand rapidly to fill the corresponding middle silencer chamber. When the gas flows in the middle silencer chamber, the silencer cotton 8 will hinder the flow of the gas, and the gas flow rate drops sharply, and finally all gather in the middle connecting pipe 9, and then enter the high-frequency tube 10;

[0082] If there are no buildings within the set distance and an instruction to switch to the sound mode is received, the sound mode can be turned on, and the control system opens the control valve 13. The working state of the exhaust pipe of the present application in the sound mode is: the intake pipe 1 discharges gas into the muffler 2. After the gas enters the muffler 2, it will first enter the central muffler chamber, and then diffuse in the central muffler chamber, diffuse through the small holes on the partition 3 and the intermediate pipe 11, and diffuse to the intermediate muffler chamber and the side muffler chamber until all the muffler chambers are completely filled. At the same time, the gas entering the central muffler chamber and the intermediate muffler chamber will also enter the connecting pipe 9 and the intermediate pipe 11 through the small holes on the connecting pipe 9 and the intermediate pipe 11. The gas entering the connecting pipe 9 will go to the corresponding high The gas flows through the high-frequency tube 10, and is discharged from the first tail pipe 4 after the energy absorption and noise reduction operation of the silencer cotton in the high-frequency tube 10; the gas entering the middle tube 11 close to the second tail pipe 5 will flow into the guide tube 12, and finally enter the second tail pipe 5, and be discharged outward through the second tail pipe 5; since the outflow path from the second tail pipe 5 is shorter and the resistance is smaller, more gas is discharged through the second tail pipe 5, and the exhaust sound effect is more obvious, and less gas is discharged through the first tail pipe 4, forming background noise; the microphone 6 collects the sound of the second tail pipe 5, converts it into an electrical signal and transmits it to the control system. After receiving the electrical signal, the control system sends a play instruction to the speaker 8, and the speaker 8 plays the same sound as the exhaust sound of the second tail pipe 5, forming a balanced sound effect.

[0083] This application is also equipped with a remote control, which can be used to control operations, such as Figure 1 shown.

[0084] like Figure 1As shown, the circumferential direction of this embodiment Figure 2 The left and right direction in .

[0085] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An exhaust pipe, comprising an air intake pipe (1), Features: Also includes, A muffler (2), the muffler (2) being a hollow cavity connected to the air intake pipe (1), and a plurality of partitions (3) being arranged inside the muffler (2) to divide the internal space of the muffler (2) into a plurality of mutually connected muffler chambers; Two groups of first tail pipes (4), the two groups of tail pipes being disposed on both axial sides of the muffler (2), the inlet ends of the first tail pipes (4) extending into the muffler chamber in the muffler (2), and the outlet ends being located on one axial side of the muffler (2); a second tail pipe (5), wherein the inlet end of the first tail pipe (4) extends into the muffler chamber in the muffler (2), the outlet end is located on one axial side of the muffler (2), and the second tail pipe (5) is provided with a control valve (13) for controlling the opening and closing of the second tail pipe (5); A sound collecting unit, the sound collecting unit being arranged on one side of the muffler (2) and being used for collecting the sound at the tail pipe outlet on one side of the muffler (2); A sound playing unit is arranged on the other side of the muffler (2) and is used for receiving the sound collected by the sound collecting unit and emitting the required sound wave based on the collected sound.

2. An exhaust pipe as claimed in claim 1, Features: The sound collection unit comprises a microphone (6) arranged at the outlet end of the second tail pipe (5).

3. An exhaust pipe as claimed in claim 1, Features: The sound playing unit comprises a loudspeaker (7) arranged at the outlet end of the first tail pipe (4) on the side of the muffler (2) opposite to the second tail pipe (5).

4. An exhaust pipe as claimed in claim 1, Features: The partition plate (3) in the muffler (2) divides the space in the muffler (2) into a central muffler chamber located in the middle of the axial direction, side muffler chambers located on both sides of the axial direction, and an intermediate muffler chamber located between the central muffler chamber and the side central chamber; the intermediate muffler chamber is provided with muffler cotton (8) which expands and fills the intermediate muffler chamber when the exhaust gas is heated.

5. An exhaust pipe as claimed in claim 4, Features: It also includes a connecting pipe (9) arranged in the silencer (2) and connected to the first tail pipe (4); the connecting pipe (9) extends from the side silencer chamber on one side to the side silencer chamber on the other side along a parallel axial direction, the connecting pipe (9) passes through the silencer cotton (8) on both sides so that the silencer cotton (8) is wrapped around the outside of the pipe body, and a plurality of small holes are evenly opened on the connecting pipe (9).

6. An exhaust pipe as claimed in claim 5, Features: It also comprises a high-frequency tube (10) which is arranged in the muffler (2) and connects the first tail pipe (4) and the connecting pipe (9); the high-frequency tube (10) is a hollow pipe arranged along a parallel axial direction, the high-frequency tube (10) is filled with muffler cotton, and a plurality of small holes are evenly opened on the tube wall of the high-frequency tube (10).

7. An exhaust pipe as claimed in claim 4, Features: It also includes an intermediate tube (11) disposed in the intermediate sound-absorbing chamber; the intermediate tube (11) is arranged along a parallel axial direction and passes through the sound-absorbing cotton (8) in the intermediate sound-absorbing chamber so that the sound-absorbing cotton (8) is wrapped around the outside of the tube body; a plurality of small holes are evenly arranged on the tube body of the intermediate tube (11); one end of the intermediate tube (11) is connected to the central sound-absorbing chamber.

8. An exhaust pipe as claimed in claim 7, Features: It also includes a conducting pipe (12); the conducting pipe (12) is a pipe structure arranged in the side muffler chamber, one end of the conducting pipe (12) is connected to the second tail pipe (5), and the other end is connected to the middle pipe (11) close to the second tail pipe (5), and a plurality of small holes are evenly arranged on the pipe body of the conducting pipe (12).

9. An exhaust pipe control method, Features: The control method is used to control an exhaust pipe as claimed in any one of claims 1 to 8, comprising: Identify the current driving environment and receive control instructions; When receiving a command to switch to the normal mode, a closing command is sent to the control valve (13), so that the exhaust gas from the intake pipe (1) passes through the muffler (2) and is discharged from the first tail pipes (4) on both sides; When the current driving environment meets the sound requirements and a command to switch to the sound mode is received, an opening command is sent to the control valve (13), so that the exhaust gas from the intake pipe (1) passes through the muffler (2) and is discharged from the first tail pipe (4) and the second tail pipe (5) on both sides, the sound collection unit collects the sound at the tail pipe outlet, and the sound playback unit receives the sound collected by the sound collection unit and emits the required sound based on the collected sound.

10. An exhaust pipe control method as claimed in claim 9, Features: The sound collecting unit collects the sound at the outlet of the second tail pipe (5), and the sound playing unit receives the sound collected by the sound collecting unit and emits a sound wave that is the same as the collected sound.

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