Exhaust pipe assembly, exhaust system and vehicle

Abstract

The invention discloses an exhaust pipe assembly, an exhaust system and a vehicle, and relates to the technical field of vehicle parts. The exhaust pipe assembly comprises a fixed pipe, a movable pipe and a driving assembly; the movable pipe is annularly sleeved with the fixed pipe, and part of the inner wall of the fixed pipe is attached to part of the outer wall of the movable pipe. The movable pipe is provided with a first end and a second end which are opposite to each other, the first end is of an open structure and located outside the fixed pipe, the second end is of a closed structure and located inside the fixed pipe, and a plurality of open holes are formed in the side wall of the movable pipe close to the area with the second end; the driving assembly is connected with the fixed pipe and used for driving the movable pipe to slide in the fixed pipe so as to adjust the number of the holes which are not blocked by the inner wall of the fixed pipe. Under the action of the driving assembly, the movable pipe can slide relative to the fixed pipe, so that the number of the holes which are not blocked by the inner wall of the fixed pipe is changed, the exhaust back pressure of the exhaust pipe assembly is adjusted, and the torque and power requirements of an engine under different working conditions are met.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle components, and in particular to an exhaust pipe assembly, an exhaust system, and a vehicle. Background Art

[0002] As a key component of a car, the exhaust pipe connects the engine and the rear muffler to ensure that the car's exhaust is discharged smoothly and in compliance with regulations.

[0003] In the related art, the exhaust pipe length is fixed, and the exhaust back pressure cannot be adjusted according to the engine state, and thus cannot meet the torque and power requirements of the engine under different working conditions. Summary of the Invention

[0004] The embodiments of the present disclosure provide an exhaust pipe assembly, an exhaust system, and a vehicle that can solve the above-mentioned technical problems existing in the related art. The technical solution is as follows:

[0005] In a first aspect, an exhaust pipe assembly is provided, the exhaust pipe assembly comprising a fixed pipe, a movable pipe and a drive assembly;

[0006] The fixed tube is encircled by the movable tube, and a portion of the inner wall of the fixed tube is in contact with a portion of the outer wall of the movable tube;

[0007] The movable tube has a first end and a second end opposite to each other, the first end is an open structure and is located outside the fixed tube, the second end is a closed structure and is located inside the fixed tube, and a side wall of the movable tube has a plurality of openings near the second end;

[0008] The driving assembly is connected to the fixed tube and is used to drive the movable tube to slide inside the fixed tube to adjust the number of openings that are not blocked by the inner wall of the fixed tube.

[0009] In some possible implementations, the exhaust pipe assembly further includes a flange connector connected to the first end of the movable pipe, and the flange connector is used to connect the first end to other components of the exhaust system.

[0010] In some possible implementations, the drive assembly includes a drive motor and a motor push rod in a transmission connection, the drive motor is connected to the fixed tube, the motor push rod is connected to the movable tube, and is used to drive the movable tube to slide relative to the fixed tube.

[0011] In some possible embodiments, the fixed tube includes a first section and a second section connected to each other, the inner wall of the first section is in contact with part of the outer wall of the movable tube, the diameter of the second section is larger than the diameter of the first section, and the second section is used to accommodate the gas discharged from the opening.

[0012] In some possible implementations, the inner wall of the first section has a groove, and the outer wall of the movable tube has a protrusion. The protrusion is located in the groove and is slidably connected to the groove.

[0013] In some possible implementations, the exhaust pipe assembly further includes a flow sensor and a controller, wherein the flow sensor is located on the outer wall of the second section and extends into the interior of the second section through a first pin;

[0014] The controller is connected to the flow sensor and the drive assembly respectively, and is used to: based on the actual flow parameters collected by the flow sensor and the target flow parameters required by the current operating conditions of the vehicle, control the drive assembly to drive the movable tube to slide, so as to adjust the number of the openings that are not blocked by the inner wall of the fixed tube.

[0015] In some possible implementations, the exhaust pipe assembly further includes a muffler, which is located on a side of the second section away from the movable pipe and connected to an inner wall of the second section.

[0016] In some possible embodiments, the exhaust pipe assembly further includes a thermoelectric conversion component, which is located on the outer wall of the fixed pipe and extends into the interior of the fixed pipe through a second pin, and the thermoelectric conversion component is electrically connected to the driving assembly.

[0017] In a second aspect, an exhaust system is provided, comprising an intake manifold assembly, a connecting pipe, a rear muffler assembly, and the exhaust pipe assembly according to any one of the first aspects;

[0018] The intake manifold assembly is connected to the movable pipe, and both ends of the connecting pipeline are respectively connected to the fixed pipe and the rear muffler assembly.

[0019] In a third aspect, a vehicle is provided, comprising the exhaust system described in the second aspect.

[0020] The beneficial effects of the technical solution provided by the present disclosure include at least:

[0021] Under the action of the drive assembly, the movable tube can slide relative to the fixed tube, thereby changing the number of openings not blocked by the inner wall of the fixed tube and adjusting the exhaust back pressure of the exhaust pipe assembly to meet the torque and power requirements of the engine under different operating conditions.

[0022] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 is a partial schematic diagram of an exhaust pipe assembly provided by an embodiment of the present disclosure;

[0025] Figure 2 is a structural schematic diagram of an exhaust pipe assembly provided by an embodiment of the present disclosure;

[0026] Figure 3 is a structural schematic diagram of an exhaust pipe assembly provided by an embodiment of the present disclosure;

[0027] Figure 4 is a cross-sectional schematic diagram of an exhaust pipe assembly provided by an embodiment of the present disclosure;

[0028] Figure 5 is an axial view of a muffler provided by an embodiment of the present disclosure;

[0029] Figure 6 is a side view of a muffler provided in an embodiment of the present disclosure;

[0030] Figure 7 is a front view of a muffler provided in an embodiment of the present disclosure;

[0031] Figure 8 It is a structural schematic diagram of an exhaust system provided in an embodiment of the present disclosure.

[0032] Reference numerals:

[0033] 1. Fixed tube; 11. First section; 11a. Groove; 12. Second section;

[0034] 2. Movable tube; 2a. First end; 2b. Second end; 2c. Opening; 2d. Protrusion;

[0035] 3. Driving assembly; 31. Driving motor; 32. Motor push rod;

[0036] 4. Flange connector;

[0037] 5. Flow sensor; 5a. First pin;

[0038] 6. Controller;

[0039] 7. Sound-absorbing member; 7a. First layer; 7b. Second layer; 71. First through hole; 72. Second through hole;

[0040] 8. Thermoelectric conversion element; 8a. Second pin;

[0041] 91. Ring clamp; 92. Bolt assembly;

[0042] 10. Sealing ring;

[0043] 101. Intake manifold assembly; 102. Connecting pipes; 103. Rear muffler assembly; 104. Connecting parts.

[0044] The above drawings illustrate specific embodiments of the present disclosure, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the present disclosure in any way, but rather to illustrate the concepts of the present disclosure to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0046] The exhaust pipe is a key component of a vehicle, connecting the engine to the rear muffler and ensuring smooth and compliant exhaust emissions. Previously, the exhaust pipe was fixed in length, making it impossible to adjust exhaust back pressure based on engine conditions. Consequently, it failed to meet the engine's torque and power requirements under varying operating conditions.

[0047] For example, when the engine is operating at a low speed (for example: 1500-3000 rpm), the engine exhaust pulse frequency is low and the exhaust gas discharge speed is slow. At this time, the exhaust pipe with a fixed length will cause the exhaust gas to be discharged too quickly, and the negative pressure in the engine cylinder is insufficient, causing the fresh mixture to be interfered with by the residual exhaust gas, the single combustion efficiency of the fuel is low, and the output torque of the engine at low speed is small.

[0048] As another example, when the engine is in a high-speed operating condition (for example: 5000-6000 rpm), the engine exhaust pulse frequency is high and the exhaust gas volume is large. At this time, the exhaust pipe with a fixed length will cause the exhaust gas discharge to be blocked, the residual exhaust gas in the cylinder will increase, the continuous multiple combustion efficiency of the fuel will be low, and the output power of the engine at high speed will be small.

[0049] The present disclosure provides an exhaust pipe assembly, referring to Figure 1 As shown, the exhaust pipe assembly includes a fixed pipe 1, a movable pipe 2 and a driving assembly 3.

[0050] The fixed tube 1 is sleeved around the movable tube 2 , and a portion of the inner wall of the fixed tube 1 fits a portion of the outer wall of the movable tube 2 .

[0051] The movable tube 2 has a first end 2a and a second end 2b opposite to each other. The first end 2a is an open structure and is located outside the fixed tube 1. The second end 2b is a closed structure and is located inside the fixed tube 1. The side wall of the movable tube 2 has multiple openings 2c near the area with the second end 2b.

[0052] The driving assembly 3 is connected to the fixed tube 1 and is used to drive the movable tube 2 to slide inside the fixed tube 1 to adjust the number of openings 2 c that are not blocked by the inner wall of the fixed tube 1 .

[0053] After passing through other components of the exhaust system, exhaust gas from the engine enters the exhaust pipe assembly from the first end 2a of the movable pipe 2. Since the second end 2b is a closed structure, the exhaust gas can only enter the interior of the fixed pipe 1 through the openings 2c in the side wall of the movable pipe 2. The number of unblocked openings 2c affects the flow resistance of the exhaust pipe assembly and the exhaust back pressure of the exhaust system.

[0054] In this way, according to the different operating conditions of the engine, the drive assembly 3 can drive the movable tube 2 to slide relative to the fixed tube 1, change the number of openings on the movable tube 2 that are not blocked by the inner wall of the fixed tube 1, and adjust the flow resistance of the exhaust pipe assembly and the exhaust back pressure of the exhaust system to meet the torque and power requirements of different parameters of the engine under different operating conditions.

[0055] In some embodiments, reference Figure 1 As shown, the exhaust pipe assembly further includes a flange connector 4 , which is connected to the first end 2 a of the movable pipe 2 . The flange connector 4 is used to connect the first end 2 a and the intake manifold assembly 101 of the exhaust system.

[0056] The intake manifold assembly 101 and the movable pipe 2 are connected via a flange connector 4. First, the flange connector 4 is fastened with bolts, making it suitable for high-temperature, high-pressure exhaust environments. It also reduces the risk of leakage at the connection and prevents exhaust gas from escaping. Second, the flange connector 4 is fixed with bolts without the need for welding, facilitating quick assembly or disassembly, which is beneficial for regular maintenance, cleaning, or replacement of the exhaust system. Finally, the flange connector 4 is a standardized component, and flange connectors 4 from different companies can be used interchangeably, reducing the manufacturing and maintenance costs of the exhaust system.

[0057] In some embodiments, reference Figure 1 As shown, the driving assembly 3 includes a driving motor 31 and a motor push rod 32 that are transmission-connected. The driving motor 31 is connected to the fixed tube 1 , and the motor push rod 32 is connected to the movable tube 2 and is used to drive the movable tube 2 to slide relative to the fixed tube 1 .

[0058] Under the action of the driving motor 31 , the motor push rod 32 can gradually expand or contract, thereby driving the movable tube 2 to move together.

[0059] The present disclosure does not limit the connection method between the drive motor 31 and the fixed pipe 1. Removable connection methods such as threaded fastening connection and snap connection can be adopted, and non-detachable connection methods such as glue dispensing and welding can also be adopted. The specific setting can be matched according to factors such as the installation space of the exhaust pipe assembly, the connection strength requirements between the drive motor 31 and the fixed pipe 1, etc.

[0060] For example, referring to Figure 3 As shown, the exhaust pipe assembly includes an annular clamp 91 and a bolt group 92. The drive motor 31 is connected to the annular clamp 91. The annular clamp 91 is sleeved on the outer wall of the fixed pipe 1 and is fastened to the outer wall of the fixed pipe 1 through the bolt group 92 to prevent the annular clamp 91 from falling off or slipping.

[0061] The present disclosure does not limit the connection method between the motor push rod 32 and the movable tube 2. For example, the motor push rod 32 can be directly connected to the outer wall of the movable tube 2. For another example, referring to Figure 1 As shown, the raised portion at the end of the motor push rod 32 can be inserted into the corresponding groove portion of the flange connector 4, and rotated at a corresponding angle (for example: 45°, 90°) to achieve the connection between the motor push rod 32 and the flange connector 4. At the same time, the flange connector 4 is connected to the movable tube 2, thereby indirectly achieving the connection between the motor push rod 32 and the movable tube 2.

[0062] The drive motor 31 can be a waterproof and high-temperature resistant servo actuator motor. This waterproof and high-temperature resistant feature prevents external liquids (e.g., road water) from entering the motor 31, potentially causing overheating, short circuits, and other adverse effects. Furthermore, it effectively reduces the impact of high-temperature exhaust gas flowing through the fixed tube 1 on the motor's operating state. Furthermore, the drive motor 31 is a high-precision, high-response motor, which improves the movement accuracy of the motor actuator 32 and the movable tube 2, enhancing the accuracy of exhaust pipe assembly adjustments.

[0063] In some embodiments, reference Figure 2 As shown, the fixed pipe 1 includes a first section 11 and a second section 12 that are connected to each other. The inner wall of the first section 11 fits into part of the outer wall of the movable pipe 2. The diameter of the second section 12 is larger than the diameter of the first section 11. The second section 12 is used to accommodate the gas discharged from the opening 2c, wherein the section of the second section 12 away from the movable pipe 2 is used to connect to other components of the exhaust system (for example: connecting pipeline 102 or rear muffler assembly 103).

[0064] Among them, the second section 12 can include a transition section and an extension section. The extension section is a tubular structure with a uniform diameter, and the diameter of the extension section is larger than the diameter of the first section 11. The transition section is located between the first section 11 and the extension section, and the diameter of the transition section gradually increases from the first section 11 to the extension section.

[0065] In this way, the setting of the transition section allows the size of the first section 11 to the extension section to change gradually, avoiding stress concentration at the connection position between the first section 11 and the second section 12 under the impact of exhaust gas, thereby improving the structural strength of the fixed pipe 1 and helping to extend the service life of the exhaust pipe assembly.

[0066] In some embodiments, reference Figure 1 and Figure 4 As shown, the inner wall of the first section 11 has a groove 11 a , and the outer wall of the movable tube 2 has a protrusion 2 d . The protrusion 2 d is located in the groove 11 a and is slidably connected to the groove 11 a .

[0067] The size of the protrusion 2d is smaller than that of the groove 11a, so the protrusion 2d can slide in the groove 11a. At the same time, as the protrusion 2d continues to slide in the groove 11a, the protrusion 2d can abut against the side wall of the groove 11a, and then the cooperation between the protrusion 2d and the groove 11a can limit the range of movement of the relative position of the first section 11 of the fixed tube 1 and the movable tube 2, thereby preventing the motor push rod 32 in the drive assembly 3 from over-expanding or over-contracting, thereby damaging the motor push rod 32 or the drive motor 31.

[0068] In some embodiments, the variable length of the exhaust pipe assembly is adjustable within a range of 1020 mm to 1380 mm, with a starting value of 1200 mm. The variable length of the exhaust pipe assembly is the sum of the length of the first section 11 and the length of the movable pipe 2 protruding from the fixed pipe 1.

[0069] Reference Figure 1 As shown, at this time, the exhaust pipe assembly is located at the starting position, the protrusion 2d is located in the middle position of the groove 11a, and the sum of the length of the first section 11 and the length of the movable pipe 2 protruding from the fixed pipe 1 is 1200 mm.

[0070] Reference Figure 2 As shown, at this time, the exhaust pipe assembly is in the shortest position, the protrusion 2d abuts against the side wall of the groove 11a, the sum of the length of the first section 11 and the length of the movable pipe 2 protruding from the fixed pipe 1 is 1020 mm, and all the through holes 2c on the side wall of the movable pipe 2 are not blocked by the inner wall of the fixed pipe 1.

[0071] In some embodiments, reference Figure 1 As shown, the exhaust pipe assembly also includes a sealing ring 10, which is located between the groove 11a and the protrusion 2d and is connected to the groove 11a. The sealing ring 10 can prevent the exhaust gas flowing out of the opening 2c from leaking from the gap between the groove 11a and the protrusion 2d to the outside of the exhaust pipe assembly. On the one hand, it prevents the exhaust gas leaking from the gap from damaging other parts of the vehicle. On the other hand, it can also reduce the noise generated when the exhaust gas leaks from the gap.

[0072] Exemplarily, the sealing ring 10 can be a high-nickel alloy sealing ring with low surface roughness and a specific expansion coefficient when heated. On the one hand, under high-temperature conditions, the expansion amount of the sealing ring 10 is calculated and designed to ensure that the sealing ring 10 always fits tightly with the contact surface of the groove 11a and the protrusion 2d. On the other hand, the high-nickel alloy can still maintain high strength in a high-temperature environment, avoiding the softening and deformation of the sealing ring 10 caused by high-temperature exhaust gas.

[0073] In some embodiments, reference Figure 3 As shown, the exhaust pipe assembly also includes a flow sensor 5 and a controller 6. The flow sensor 5 is located on the outer wall of the second section 12 and extends into the interior of the second section 12 through the first pin 5a. The flow sensor 5 is used to detect the flow of gas in the second section 12.

[0074] The controller 6 is connected to the flow sensor 5 and the drive assembly 3 respectively. The controller 6 is used to: based on the actual flow parameters collected by the flow sensor 5 and the target flow parameters required by the current operating conditions of the vehicle, control the drive assembly 3 to drive the movable tube 2 to slide, so as to adjust the number of openings 2c that are not blocked by the inner wall of the fixed tube 1.

[0075] In some embodiments, the controller 6 can also be connected to other components or sensors of the vehicle for communication. The controller 6 can confirm the target back pressure value of the current working condition based on relevant signals (for example, engine speed, pressure of the intake manifold assembly 101, exhaust temperature and flow in the second section 12), and confirm the target length of the exhaust pipe assembly corresponding to the target back pressure value based on the pre-stored correspondence between the back pressure value and the length of the exhaust pipe assembly, and control the drive assembly 3 to drive the movable tube 2 to slide until the actual length of the exhaust pipe assembly matches the target length of the exhaust pipe assembly.

[0076] It is understood that the controller 6 may include one or more processing cores, such as a quad-core processor, an octa-core processor, etc. The controller 6 may be implemented in at least one hardware form selected from the group consisting of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The controller 6 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit), and the coprocessor is a low-power processor for processing data in the standby state.

[0077] In some embodiments, the controller 6 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the in-vehicle screen.

[0078] In some embodiments, the controller 6 may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning. For example, the AI ​​processor can predict the changing trend of the target exhaust back pressure through machine learning based on the historical working data of the exhaust pipe assembly and adjust the length of the exhaust pipe assembly in advance.

[0079] In some embodiments, reference Figure 2 As shown, the exhaust pipe assembly further includes a muffler 7 , which is located on the side of the second section 12 away from the movable pipe 2 and is connected to the inner wall of the second section 12 . The muffler 7 is used to reduce the noise generated by the flow of exhaust gas in the second section 12 .

[0080] In some embodiments, reference Figures 5 to 7 As shown, the shape of the silencer 7 is adapted to the inner wall size of the second section 12. The silencer 7 is a two-level Sierpinski honeycomb fractal structure. The silencer 7 is divided into two layers. The cross section of the first layer 7a is provided with primary through holes 71 with three aperture ratios arranged in a specific arrangement. The cross section of the second layer 7b is provided with secondary through holes 72 with the same arrangement style and aperture ratio as those on the cross section of the first layer 71, which are repeatedly designed within each primary aperture.

[0081] The large holes on the secondary Sierpinski honeycomb fractal structure can stimulate Helmholtz resonance, the small holes induce viscous dissipation, the sound waves generate heat by friction with the hole walls, and the fractal holes make the sound wave propagation path tortuous, increasing the number of reflections, covering a wider frequency of noise, and improving the noise reduction effect.

[0082] The shape of the silencer 7 of the embodiment of the present disclosure can be the same as that of the second section 12, both of which are cylindrical structures, or can be a polygonal fractal structure. The fractal edges complicate the sound wave reflection path, making it easier to scatter the sound waves, thereby optimizing noise.

[0083] In some embodiments, reference Figure 2 and Figure 3 As shown, the exhaust pipe assembly further includes a thermoelectric conversion element 8 , which is located on the outer wall of the fixed pipe 1 and extends into the interior of the fixed pipe 1 through a second pin 8 a . The thermoelectric conversion element 8 is electrically connected to the driving assembly 3 .

[0084] The drive motor 31 has an energy storage capacitor. The second pin 8a can collect heat energy in the exhaust gas. The thermoelectric converter 8 converts the collected heat energy into electrical energy and supplies it to the energy storage capacitor through the corresponding wiring harness. The energy storage capacitor stores the electrical energy and uses it to drive the motor 31.

[0085] The present disclosure does not impose any specific limitation on the number of thermoelectric conversion elements 8 , which can be matched and set according to parameters such as the power consumption of the drive motor 31 and the capacity of the energy storage capacitor. Multiple thermoelectric conversion elements 8 are connected in series.

[0086] Based on the same concept, the embodiment of the present disclosure also provides an exhaust system, referring to Figure 8 As shown, the exhaust system may include an intake manifold assembly 101, a connecting pipe 102, a rear muffler assembly 103, and the exhaust pipe assembly of any of the above embodiments. The intake manifold assembly 101 is connected to the movable pipe 2, and the two ends of the connecting pipe 102 are connected to the fixed pipe 1 and the rear muffler assembly 103, respectively.

[0087] The engine exhaust gas passes through the intake manifold and catalyst in the intake manifold assembly 101, the exhaust pipe assembly, the connecting pipe 102 and the rear muffler assembly 103 in sequence.

[0088] In some embodiments, the exhaust system further includes a connector 104 , which is used to connect related components of the exhaust system to a vehicle frame or chassis.

[0089] The exhaust system works as follows:

[0090] 1. Waste gas emissions and heat acquisition.

[0091] The high-temperature exhaust gas generated by engine combustion enters the exhaust manifold, drives the turbocharger, enters the catalyst, and then enters the exhaust pipe assembly. The exhaust gas flows through the interior of the fixed tube 1. A thermoelectric conversion element 8 is provided on the outer wall of the fixed tube 1. Due to the temperature difference between the inside and outside of the fixed tube 1, the thermoelectric conversion element 8 generates direct current based on the Seebeck effect.

[0092] 2. Electricity Distribution

[0093] The electric energy generated by the thermoelectric converter 8 is transmitted to the energy storage capacitor of the drive motor 31 after passing through relevant components (for example, a DC voltage regulator). When the charge of the energy storage capacitor reaches a preset threshold (for example, 50%), the electric energy directly powers the drive motor 31. The remaining electric energy can be transmitted to the vehicle battery through the relevant wiring harness to power the vehicle electrical appliances (for example, lights, air conditioners), thereby reducing the engine load.

[0094] When the generated electricity cannot meet the needs of the drive motor 31, the energy storage capacitor is switched to power the drive motor 31; when the energy storage capacitor cannot meet the needs of the drive motor 31, the power supply to the power generation capacitor is cut off, and the generated electricity is only used to directly power the drive motor 31.

[0095] 3. Dynamically adjust the exhaust pipe assembly

[0096] After the controller 6 is powered on, it first obtains relevant signals (for example: engine speed, pressure of the intake manifold assembly 101, exhaust temperature and flow in the second section 12), confirms the target back pressure value of the current working condition, and based on the pre-stored correspondence between the back pressure value and the exhaust pipe assembly length, confirms the target length of the exhaust pipe assembly corresponding to the target back pressure value, and controls the drive assembly 3 to drive the movable tube 2 to slide until the actual length of the exhaust pipe assembly is adapted to the target length of the exhaust pipe assembly.

[0097] At the same time, the controller 6 pre-stores the temperature protection logic. If the exhaust temperature is greater than 700°C, the length of the exhaust pipe assembly will be forced to be shortened to reduce the exhaust gas residence time and reduce the heat load.

[0098] 4. Noise Reduction

[0099] When the broadband noise (100Hz-5000Hz) carried by the exhaust gas enters the silencer 7 with the secondary Sierpinski honeycomb fractal structure, the large-sized holes trigger Helmholtz resonance, and the sound energy is converted into heat energy in the cavity oscillation, completing low-frequency absorption (100Hz-500Hz). The small-sized holes consume the sound energy through viscous friction and heat conduction, completing high-frequency attenuation (2000Hz-5000Hz).

[0100] 5. System self-check and maintenance

[0101] When the vehicle's driving distance reaches a preset number of kilometers or the driving time reaches a preset time, the controller 6 performs periodic self-inspections, such as: stroke calibration of the drive motor 31 and the motor push rod 32 (to prevent mechanical error accumulation), impedance testing of the thermoelectric converter 8 (to detect aging and prompt replacement of abnormal units).

[0102] If a fault is found in the self-inspection, the driver and passengers should be promptly notified of the relevant fault. For example, when the movable tube 2 is stuck, the controller 6 will detect abnormal parameters of the drive motor 31, and report an error after trying to move in the opposite direction three times, and light up the instrument panel warning light; if the thermoelectric efficiency of the thermoelectric conversion element 8 decreases, it will be detected that the power generation power is less than 50% of the set value for one hour continuously, and it will be judged that the thermoelectric conversion element 8 is aging or the pins are clogged, and a prompt will be given to replace or clean it.

[0103] An embodiment of the present disclosure further provides a vehicle, comprising the exhaust system of any one of the above embodiments.

[0104] The vehicle is equipped with the exhaust system of the above embodiment, which has the following beneficial effects:

[0105] 1. In terms of structure, the exhaust system can dynamically optimize exhaust back pressure according to parameters such as engine speed, avoiding problems such as insufficient torque at low engine speeds or power loss at high engine speeds.

[0106] Second, in terms of energy, the heat energy of high-temperature exhaust gas is recovered and the thermoelectric conversion element 8 is used to assist in the power supply of the drive component 3 in the exhaust system.

[0107] 3. In terms of noise, the silencer 7 is designed with a honeycomb structure unit inside to achieve broadband noise reduction.

[0108] It is understandable that the vehicle provided by the embodiment of the present disclosure includes hardware structures and / or software modules corresponding to the execution of each function in order to realize the above functions. In combination with the units and algorithm steps of each example disclosed in the embodiment of the present disclosure, the embodiment of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to realize the described functions for each specific application, but such implementation should not be considered to exceed the scope of the technical solution of the embodiment of the present disclosure.

[0109] The present disclosure does not specifically limit the type of vehicle, such as sedans, buses, trucks, sport utility vehicles (SUVs), etc. The vehicle can be a fuel vehicle or a hybrid electric vehicle (HEV), such as an extended-range vehicle or a plug-in vehicle.

[0110] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0111] It is understood that in this disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of related objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0112] It will be further understood that the terms "first," "second," and the like are used to describe various types of information, but such information should not be limited to these terms. These terms are used solely to distinguish information of the same type from one another and do not indicate a particular order or level of importance. In fact, the terms "first," "second," and the like are fully interchangeable. For example, first information could be referred to as second information, and similarly, second information could be referred to as first information without departing from the scope of this disclosure.

[0113] It can be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0114] It is further understood that, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integral molding; they may refer to mechanical connections, electrical connections, or communication between them; they may refer to direct connections without any other components between them, or indirect connections through an intermediary; they may refer to internal communication between two elements, or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0115] It is further understood that although operations are described in a particular order in the drawings in the embodiments of the present disclosure, this should not be construed as requiring that the operations be performed in the particular order shown or in a serial order, or that all of the operations shown be performed to obtain the desired results. In certain circumstances, multitasking and parallel processing may be advantageous.

[0116] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the solutions disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0117] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. An exhaust pipe assembly, characterized in that: The exhaust pipe assembly comprises a fixed pipe (1), a movable pipe (2) and a driving assembly (3); The fixed tube (1) is encircled by the movable tube (2), and a portion of the inner wall of the fixed tube (1) is in contact with a portion of the outer wall of the movable tube (2); The movable tube (2) has a first end (2a) and a second end (2b) opposite to each other, the first end (2a) being an open structure and being located outside the fixed tube (1), the second end (2b) being a closed structure and being located inside the fixed tube (1), and a side wall of the movable tube (2) having a plurality of openings (2c) near an area having the second end (2b); The driving assembly (3) is connected to the fixed tube (1) and is used to drive the movable tube (2) to slide inside the fixed tube (1) to adjust the number of openings (2c) not blocked by the inner wall of the fixed tube (1).

2. The exhaust pipe assembly according to claim 1, characterized in that The exhaust pipe assembly further comprises a flange connection (4), the flange connection (4) being connected to the first end (2a) of the movable pipe (2), and the flange connection (4) being used to connect the first end (2a) and other components of the exhaust system.

3. The exhaust pipe assembly according to claim 1, characterized in that The driving assembly (3) comprises a driving motor (31) and a motor push rod (32) in a transmission connection, wherein the driving motor (31) is connected to the fixed tube (1), and the motor push rod (32) is connected to the movable tube (2) and is used to drive the movable tube (2) to slide relative to the fixed tube (1).

4. The exhaust pipe assembly according to claim 1, characterized in that The fixed tube (1) comprises a first section (11) and a second section (12) connected to each other, the inner wall of the first section (11) is in contact with a portion of the outer wall of the movable tube (2), the diameter of the second section (12) is larger than the diameter of the first section (11), and the second section (12) is used to accommodate gas discharged from the opening (2c).

5. The exhaust pipe assembly according to claim 4, characterized in that The inner wall of the first section (11) has a groove (11a), and the outer wall of the movable tube (2) has a protrusion (2d). The protrusion (2d) is located in the groove (11a) and is slidably connected to the groove (11a).

6. The exhaust pipe assembly according to claim 4, characterized in that The exhaust pipe assembly further comprises a flow sensor (5) and a controller (6), wherein the flow sensor (5) is located on the outer wall of the second section (12) and extends into the interior of the second section (12) through a first pin (5a); The controller (6) is connected to the flow sensor (5) and the drive assembly (3) respectively, and is used to control the drive assembly (3) to drive the movable tube (2) to slide based on the actual flow parameter collected by the flow sensor (5) and the target flow parameter required by the current working condition of the vehicle, so as to adjust the number of the openings (2c) not blocked by the inner wall of the fixed tube (1).

7. The exhaust pipe assembly according to claim 4, characterized in that The exhaust pipe assembly further comprises a muffler (7), which is located on a side of the second section (12) away from the movable pipe (2) and is connected to the inner wall of the second section (12).

8. The exhaust pipe assembly according to claim 1, characterized in that The exhaust pipe assembly further comprises a thermoelectric conversion element (8), which is located on the outer wall of the fixed pipe (1) and extends into the interior of the fixed pipe (1) through a second pin (8a), and is electrically connected to the drive assembly (3).

9. An exhaust system, characterized in that: The exhaust system comprises an intake manifold assembly (101), a connecting pipe (102), a rear muffler assembly (103), and an exhaust pipe assembly according to any one of claims 1 to 8; The intake manifold assembly (101) is connected to the movable pipe (2), and the two ends of the connecting pipe (102) are respectively connected to the fixed pipe (1) and the rear muffler assembly (103).

10. A vehicle, characterized in that: The vehicle comprises an exhaust system as claimed in claim 9 .

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