Automobile exhaust aftertreatment assembly with particulate trap

Abstract

This invention relates to the field of automotive exhaust emission purification technology, and in particular provides an automotive exhaust aftertreatment assembly with a particulate filter, comprising an integrated pipe, an intake pipe connected to the intake end of the integrated pipe, and an outlet pipe connected to the outlet end. An outer cover connects the intake pipe and the outlet pipe, and a particulate filter is disposed inside the outer cover. The particulate filter contains a catalytic chamber, and its wall has a purified gas discharge port for discharging purified gas. A gas emission channel communicating with the outlet pipe is formed between the outer cover and the outer wall of the particulate filter. The particulate filter also has a backflush port, with its outlet facing the purified gas discharge port and its inlet communicating with the catalytic chamber. The particulate filter is equipped with a pressure response mechanism. This invention can continuously maintain the unobstructed flow of the purified gas discharge port, preventing abnormal increases in exhaust back pressure and ensuring stable engine performance.

Description

Technical Field

[0001] This invention relates to the field of automotive exhaust emission purification technology, and in particular to an automotive exhaust aftertreatment assembly with a particulate filter. Background Technology

[0002] Automotive exhaust aftertreatment systems are key devices for reducing pollutant emissions. Particulate filters (such as DPF or GPF) physically capture particulate matter (PM) in exhaust gas using structures like wall-flow filters. To remove the captured particles and prevent clogging, periodic "regeneration" is necessary. Catalytic particulate filters are a common solution, where a catalyst (such as a precious metal) is coated onto the filter carrier. When the exhaust temperature reaches a certain level, the catalyst significantly lowers the ignition temperature of particulate matter such as soot, causing it to oxidize (combust) at a relatively low exhaust temperature, converting it into carbon dioxide gas for emission. This passive regeneration maintains the filter's patency. This catalytic combustion process is a well-known technology in the field.

[0003] However, during catalytic regeneration, some incompletely oxidized or newly generated extremely fine particulate matter may flow downstream with the purified gas. Existing catalytic particulate filter assemblies typically have fixed exhaust ports or slits at their purified gas outlets. Over long-term operation, these fine particles can gradually adhere to and clog these exhaust ports, leading to abnormally high exhaust back pressure. This not only affects engine performance but, in severe cases, can also hinder the normal regeneration process of the filter, reducing system reliability and lifespan. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an automotive exhaust aftertreatment assembly with a particulate filter, comprising an integrated pipe. The integrated pipe has an intake pipe connected to its intake end and an outlet pipe connected to its outlet end. An outer casing connects the intake pipe and the outlet pipe. A particulate filter is disposed inside the outer casing, and a catalytic converter is disposed inside the particulate filter. A purified gas discharge port is formed on the filter wall to discharge purified gas. A gas discharge channel communicating with the outlet pipe is formed between the outer casing and the outer wall of the particulate filter. The particulate filter also has a backflush port, with its outlet facing the purified gas discharge port and its inlet communicating with the catalytic converter. The outer wall of the particulate filter has an outwardly protruding shoulder, and a first spring connects the shoulder to the inner wall of the outlet end of the outer casing, allowing the particulate filter to move along... Axial movement; the particulate collection tube is equipped with a pressure response mechanism, which includes a control plate slidably disposed in the catalytic chamber and a second spring providing elastic reset force to the control plate; the control plate is used to block or open the inlet of the backflush vent; when the purified gas discharge port is blocked, causing the gas pressure in the catalytic chamber to rise, the pressure response mechanism is activated, causing the backflush vent to open, and at the same time, the gas pressure in the catalytic chamber pushes the particulate collection tube to move towards the outlet pipe against the elastic force of the first spring until the sealing plate closes the inlet of the outlet pipe, causing the gas pressure in the catalytic chamber to rise further, and the gas is blown at high speed through the backflush vent towards the purified gas discharge port for cleaning; when the blockage is cleared, the gas pressure in the catalytic chamber drops, the first spring pushes the particulate collection tube to reset, the outlet pipe reopens, and the second spring pushes the control plate to reset and close the backflush vent.

[0005] More preferably, the particulate collection tube has an exhaust chamber at one end near the air inlet, and a plurality of purified gas discharge holes are arranged in a ring array on the exhaust chamber. A plurality of backflush holes are arranged in a ring array on the shoulder of the ring. The inner end of the backflush hole is connected to the catalytic chamber, and the outer end is connected to the gas discharge channel. The gas outlet path blows along the outer wall of the particulate collection tube toward the purified gas discharge holes.

[0006] More preferably, the catalytic chamber is provided with a core seat, and the gas pressure response mechanism includes a control plate fixed on the core seat. The control plate is slidably disposed in the catalytic chamber. The gas pressure response mechanism also includes a second spring that provides an elastic restoring force to the control plate. The control plate is used to block or open the inlet of the backflush vent. When the force exerted by the gas pressure in the catalytic chamber on the control plate is greater than the preload of the second spring, the control plate is pressed and moves to open the backflush vent.

[0007] More preferably, a filter element baffle is fixed on the core seat, and the filter element baffle slides in contact with the cavity wall of the catalytic chamber.

[0008] More preferably, the outlet end of the particle collecting tube is provided with a sealing plate, one end of the second spring abuts against the control plate, and the other end abuts against the sealing plate.

[0009] More preferably, the particulate collection tube has a variable diameter cavity at one end where the sealing plate is installed, the two ends of the catalytic chamber are connected to the exhaust chamber and the variable diameter cavity, and the control plate is in sliding contact with the cavity wall of the variable diameter cavity.

[0010] In a further preferred embodiment, the inner wall of the air outlet end of the particle collecting tube is provided with a settling cavity, a baffle is fixed in the settling cavity, an air outlet is provided on the baffle, a moving volume is formed between the baffle and the sealing plate, and the two ends of the air outlet are connected to the air outlet tube and the moving volume.

[0011] More preferably, one end of the variable diameter cavity connected to the exhaust cavity is provided with an end face limiting part, and after the control plate moves axially to reset, it abuts against the limiting part to form a stroke limit.

[0012] The advantages of this invention compared to existing technologies are as follows: a catalytic chamber is set inside the particulate filter tube, and a purified gas emission port is opened in the tube wall, forming a gas emission channel between the outer cover and the outer wall of the particulate filter tube. This invention achieves automatic detection and cleaning of the purified gas emission port by setting a pressure response mechanism. When the purified gas emission port is blocked by fine particulate matter, causing the gas pressure in the catalytic chamber to rise, the pressure response mechanism can promptly open the backflush port, using the gas in the catalytic chamber to backflush and clean the emission port, effectively clearing the blockage. After cleaning, the pressure response mechanism automatically resets and closes the backflush port. Therefore, this invention can continuously maintain the unobstructed flow of the purified gas emission port, avoid abnormal increases in exhaust back pressure, ensure stable engine performance, and extend the service life and reliability of the particulate filter and the entire aftertreatment system. This solves the problems in existing technologies where the purified gas emission port is easily blocked by fine particulate matter, lacks an active cleaning mechanism, leading to abnormal increases in exhaust back pressure, affecting engine performance, hindering normal regeneration of the filter, and reducing system reliability and service life. Meanwhile, the present invention creates a pressure storage effect before backflushing by linking the axial movement of the particle collection tube with the closing of the air inlet of the exhaust pipe, generating a pulsed high-speed airflow, which further enhances the cleaning effect. Attached Figure Description

[0013] Figure 1 A plan view of an automotive exhaust aftertreatment assembly with a particulate filter provided for an embodiment of the present invention; Figure 2 A schematic diagram of a vehicle exhaust aftertreatment assembly with a particulate filter provided in an embodiment of the present invention from a three-dimensional perspective. Figure 3 A cross-sectional plan view of an automotive exhaust aftertreatment assembly with a particulate filter provided in an embodiment of the present invention. Figure 4 The automotive exhaust aftertreatment assembly with a particulate filter provided in the embodiments of the present invention consists of... Figure 3 Enlarged schematic diagram of part A; Figure 5 A schematic diagram of the particulate filter in the automotive exhaust aftertreatment assembly with particulate filter provided in the embodiment of the present invention, after being cut open from the variable diameter cavity. Figure 6 This is a side view of a baffle plate in an automotive exhaust aftertreatment assembly with a particulate trap, provided for an embodiment of the present invention.

[0014] In the diagram: 1. Integrated tube; 2. Inlet pipe; 3. Outlet pipe; 4. Outer cover; 5. Particulate collection tube; 6. Sealing plate; 7. Settlement cavity; 8. Baffle; 9. Moving volume; 10. Outlet; 11. Shoulder ring; 12. First spring; 13. Exhaust chamber; 14. Purified gas discharge port; 15. Gas discharge channel; 16. Variable diameter chamber; 17. Catalytic chamber; 18. Core seat; 19. Control board; 20. Backflush port; 21. Second spring; 22. Filter element baffle; 23. Restriction section. Detailed Implementation

[0015] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] In one implementation, such as Figures 1-6 As shown: This embodiment provides an automotive exhaust aftertreatment assembly with a particulate trap, including an integrated pipe 1. The intake end of the integrated pipe 1 is connected to an intake pipe 2, and the exhaust end is connected to an exhaust pipe 3. An outer cover 4 is connected between the intake pipe 2 and the exhaust pipe 3. A particulate trap 5 is provided inside the outer cover 4. The intake end of the particulate trap 5 is connected to the intake pipe 2 through a metal corrugated pipe, so that the particulate trap 5 can achieve axial movement. The particulate trap 5 has a catalytic chamber 17 inside, and a purified gas discharge hole 14 is opened on its wall to discharge purified gas. A gas discharge channel 15 is formed between the outer cover 4 and the outer wall of the particulate trap 5, which is connected to the gas outlet pipe 3. The particulate trap 5 is also provided with a backflush hole 20. The outlet of the backflush hole 20 faces the purified gas discharge hole 14, and the inlet is connected to the catalytic chamber 17. The particulate trap 5 is provided with a pressure response mechanism. When the purified gas discharge hole 14 is blocked, causing the gas pressure in the catalytic chamber 17 to rise to the first threshold, the pressure response mechanism is activated, causing the backflush hole 20 to open. The gas in the catalytic chamber 17 is blown through the backflush hole 20 to the purified gas discharge hole 14 for cleaning. When the gas pressure in the catalytic chamber 17 drops to the second threshold, the pressure response mechanism is reset, causing the backflush hole 20 to close.

[0017] The outlet of the backflush vent 20 faces the purified gas discharge port 14, and the inlet is connected to the catalytic chamber 17. There can be several backflush vents 20, for example, arranged in a single row or multiple rows on the outer wall of the particulate collection tube 5. Their outlets can be designed to be oblique or straight to ensure that the blown gas can effectively act on the purified gas discharge port 14. The inlet of the backflush vent 20 is directly connected to the catalytic chamber 17, allowing the high-pressure gas in the catalytic chamber 17 to be directly used as the backflush gas source. The particulate collection tube 5 is equipped with a pressure response mechanism. When the purified gas discharge port 14 becomes blocked, causing the gas pressure in the catalytic chamber 17 to rise to a first threshold, the pressure response mechanism activates, opening the backflush vent 20, and the gas in the catalytic chamber 17 is blown through the backflush vent 20 towards the purified gas discharge port 14 for cleaning. When the gas pressure in the catalytic chamber 17 drops to a second threshold, the pressure response mechanism resets, closing the backflush vent 20. For example, the pressure response mechanism can be a simple mechanical pressure valve or mechanical pressure assembly, including a control plate or piston that moves with the pressure. One side of the control plate or piston bears the pressure within the catalytic chamber 17, while the other side is preloaded by a spring. When the pressure within the catalytic chamber 17 exceeds a first threshold set by the spring preload, the control plate or piston moves, opening the backflush port 20. This serves two purposes: first, it releases the high-pressure gas from the catalytic chamber 17; second, it applies the released high-pressure gas to the backflush port 14, blowing any blockages on the port into the particulate collection tube 5 for catalytic cleaning or dilution. After cleaning, the pressure within the catalytic chamber 17 decreases. When the pressure falls below a second threshold set by the spring preload, the control plate or piston resets under spring force, closing the backflush port 20. The first and second thresholds can be set according to actual operating conditions and cleaning effect requirements; for example, the first threshold can be set to 0.5 bar, and the second threshold to 0.2 bar. Therefore, the pressure response mechanism can automatically and on demand clean the purified gas discharge port 14, effectively preventing blockage.

[0018] This invention achieves automatic detection and cleaning of the purified gas emission port 14 by incorporating a pressure response mechanism. When the purified gas emission port 14 becomes clogged with fine particulate matter, causing an increase in air pressure within the catalytic converter chamber 17, the pressure response mechanism promptly opens the backflush port 20, using the gas within the catalytic converter chamber 17 to backflush and clean the emission port, effectively clearing the blockage. After cleaning, the pressure response mechanism automatically resets and closes the backflush port 20. Therefore, this invention can continuously maintain the unobstructed flow of the purified gas emission port 14, preventing abnormal increases in exhaust back pressure, ensuring stable engine performance, and extending the service life and reliability of the particulate filter and the entire aftertreatment system.

[0019] In another embodiment, the outer wall of the particulate collection tube 5 is provided with an outwardly protruding shoulder 11, and a first spring 12 is connected between the shoulder 11 and the inner wall of the outlet end of the outer cover 4; the particulate collection tube 5 is provided with an exhaust chamber 13 near the inlet end, and a number of purified gas discharge holes 14 are arranged in a ring array on the exhaust chamber 13, and a number of backflush holes 20 are arranged in a ring array on the shoulder 11. The inner end of the backflush hole 20 is connected to the catalytic chamber 17, and the outer end is connected to the gas discharge channel 15, and the gas discharge path blows along the outer wall of the particulate collection tube 5 toward the purified gas discharge hole 14.

[0020] The first spring 12 provides elastic support between the shoulder 11 and the outer cover 4. Its function is to absorb vibrations generated during vehicle operation, reduce rigid impacts between the particulate collection tube 5 and the outer cover 4, and compensate for dimensional changes caused by thermal expansion and contraction, thereby ensuring the stability and reliability of the particulate collection tube 5 within the assembly. The first spring 12 can be a helical compression spring, with its two ends abutting against the inner wall of the ring shoulder 11 and the outer cover 4, respectively; it can also be a wave spring or a disc spring to provide the required elastic force within a limited space. When the air pressure inside the particle collection tube 5 exceeds the first threshold support force of the first spring 12, the particle collection tube 5 will move axially towards the outlet side, the first spring 12 will be compressed and shortened, and the outlet end of the particle collection tube 5 will close. When the particle collection tube 5 moves to its maximum position towards the outlet side, its sealing plate 6 will press against the inlet of the outlet pipe 3, closing the outlet pipe 3 channel. This allows the high-pressure gas to rapidly increase in pressure inside the particle collection tube 5, causing the high-pressure gas to be rapidly blown out from the backflush hole 20 in a short time. The gas is blown along the outer wall of the particle collection tube 5 towards the purified gas. The discharge port 14 improves the effect of clearing blockages; conversely, after the blockages on the purified gas discharge port 14 are cleared, the gas enters the catalytic chamber 17 and, after the impurities are catalyzed and treated by the catalytic chamber 17, the gas will pass through the purified gas discharge port 14 and be discharged normally. At the same time, the gas pressure in the catalytic chamber 17 is released or balanced. At this time, the gas pressure reaches the second threshold and there is no longer enough gas pressure to push the particle collection tube 5 to move towards the gas outlet side. At this time, the first spring 12 returns to its length and pushes the shoulder 11 in the opposite direction. The shoulder 11 pushes the particle collection tube 5 to move axially in the opposite direction to the initial position. The closed end of the particle collection tube 5 moves away from the inlet of the gas outlet pipe 3, the gas outlet pipe 3 opens, and the gas is discharged normally from the purified gas discharge port 14 and finally discharged normally through the gas outlet pipe 3, realizing automatic operation.

[0021] The outer wall of the particle collection tube 5, where the purified gas discharge hole 14 is located, is tapered, so that when the purified gas discharge hole 14 is back-blown, the gas can be blown along the outer wall of the particle collection tube 5 toward the purified gas discharge hole 14, thereby improving the impact and cleaning effect on the purified gas discharge hole 14.

[0022] In another embodiment, a core seat 18 is provided in the catalytic chamber 17, and the gas pressure response mechanism includes a control plate 19 fixed on the core seat 18. The control plate 19 is slidably disposed in the catalytic chamber 17. The gas pressure response mechanism also includes a second spring 21 that provides elastic restoring force to the control plate 19. The control plate 19 is used to block or open the inlet of the backflush vent 20. When the force exerted by the gas pressure in the catalytic chamber 17 on the control plate 19 is greater than the preload force of the second spring 21, the control plate 19 is pressed and moves to open the backflush vent 20.

[0023] An annular space is formed between the outer wall of the core seat 18 and the cavity wall of the catalytic chamber 17. This annular space serves as both the catalytic space and the concentrated space for gas to enter the catalytic chamber 17. When the purified gas exhaust port 14 is blocked, the gas entering this annular space will accumulate and increase in pressure in a short time, thereby pushing the control plate 19 to move axially and compressing the second spring 21, thus moving the control plate 19 from the left side of the backflush port 20 to the right side of the backflush port 20 (as shown in the figure). This sliding arrangement can be achieved by forming a fitting gap between the outer peripheral edge of the control plate 19 and the inner wall of the catalytic chamber 17, or by setting guide grooves or guide posts on the control plate 19 or the inner wall of the catalytic chamber 17, ensuring the smoothness and accuracy of the control plate 19 during movement. The function of the second spring 21 is to continuously apply a preset elastic force to the control plate 19, keeping it in its initial position when there is no external air pressure, and pushing the control plate 19 back to its original position after the air pressure decreases. Once the force exerted by the air pressure on the control plate 19 is less than the preload of the second spring 21, the elastic restoring force of the second spring 21 can quickly and accurately push the control plate 19 back to its original position, thereby closing the backflush vent 20. This automatic control mechanism based on force balance not only ensures that the backflush vent 20 can be opened in a timely and accurate manner when needed, avoiding abnormal increases in exhaust back pressure and system performance degradation due to insensitive response, but also ensures reliable reset and closure after cleaning, preventing unnecessary energy loss or gas leakage. Compared to simple mechanisms that rely solely on air pressure sensing, this solution achieves precise control of the opening and closing of the backflush vent 20 through the synergistic action of the core seat 18, the control plate 19, and the second spring 21, significantly improving the reliability and efficiency of the particulate filter regeneration process and extending the system's service life.

[0024] In another implementation, a filter element baffle 22 is fixed on the core seat 18. The filter element baffle 22 slides in contact with the cavity wall of the catalytic chamber 17, meaning that when the filter element baffle 22 moves inside the catalytic chamber 17, its outer edge maintains continuous contact with the inner wall of the catalytic chamber 17. The filter element baffle 22 intercepts impurities in the catalytically treated gas, preventing impurities from entering the backflush vent 20. This allows impurities or particulate matter to continue catalyzing within the catalytic chamber 17, ensuring that only the catalytically treated gas enters the backflush vent 20 and is blown towards the purified gas discharge port 14 for reuse.

[0025] In another implementation, the outlet end of the particle collecting pipe 5 is provided with a sealing plate 6. One end of the second spring 21 abuts against the control plate 19, and the other end abuts against the sealing plate 6. The sealing plate 6 is a sealing structure on the outlet end of the particle collecting pipe 5, that is, the outlet end of the particle collecting pipe 5 is not open. The sealing plate 6 serves as a support point for the second spring 21. The sealing plate 6 is also used to block the inlet of the outlet pipe 3 after the particle collecting pipe 5 moves axially towards the outlet side.

[0026] In another embodiment, the particulate collection pipe 5 is provided with a variable diameter cavity 16 at one end where the sealing plate 6 is installed. The two ends of the catalytic chamber 17 are connected to the exhaust chamber 13 and the variable diameter cavity 16. The control plate 19 is in sliding contact with the cavity wall of the variable diameter cavity 16.

[0027] The variable-diameter cavity 16 refers to the cavity inside the particulate trap 5, near the end of the sealing plate 6, where its inner diameter changes. It is designed to provide a specific spatial layout and functional area for the internal components. Specifically, the inner diameter gradually increases from the diameter of the catalytic chamber 17, forming a step to accommodate the movement of the control plate 19 or provide a limit. This variable-diameter cavity 16 provides the necessary space and guidance for the sliding of the control plate 19, preventing interference or jamming with the pipe wall during movement, thus ensuring smooth movement. The inner end of the backflush port 20 communicates with the variable-diameter cavity 16. The catalytic chamber 17 is the core area inside the particulate trap 5 where the catalytic reaction takes place. Its two ends communicate with the exhaust chamber 13 and the variable-diameter cavity 16, meaning that gas can flow freely between these three cavities. This communication can be achieved through direct openings or channels; for example, the inlet end of the catalytic chamber 17 can communicate directly with the exhaust chamber 13, and the outlet end can communicate directly with the variable-diameter cavity 16, ensuring smooth airflow and effective pressure transmission. This connectivity ensures that pressure changes within the catalytic chamber 17 are effectively transmitted to the variable-diameter cavity 16, and subsequently act on the control plate 19, forming the basis for the normal operation of the pressure response mechanism. The control plate 19 is a key component of the pressure response mechanism. It slides in contact with the cavity wall of the variable-diameter cavity 16. The control plate 19 can be piston-shaped, with its outer diameter slightly smaller than the inner diameter of the variable-diameter cavity 16. It forms a sliding seal with the cavity wall through a sealing ring (such as an O-ring or piston ring) to reduce gas leakage and provide stable sliding guidance. This sliding contact ensures that the control plate 19 can move stably and accurately under pressure, avoiding skewness, jamming, or irregular movement, thereby improving the sensitivity and reliability of the pressure response mechanism.

[0028] In another implementation, a cavity 7 is formed on the inner wall of the outlet end of the particulate collection pipe 5. A baffle 8 is fixed inside the cavity 7, and an outlet 10 is formed on the baffle 8. A moving volume 9 is formed between the baffle 8 and the sealing plate 6. The two ends of the outlet 10 are connected to the outlet pipe 3 and the moving volume 9. The outlet 10 is a hole or gap on the baffle 8, and its function is to allow purified gas to pass through. The design of the outlet 10 is crucial for gas emission efficiency and uniformity. The outlet 10 can be designed as a circular, elliptical, rectangular, or slit-shaped hole. To further optimize gas emission, there can be multiple outlets 10, arranged in a ring array, linear array, or irregular distribution. A moving volume 9 is formed between the baffle 8 and the sealing plate 6. The moving volume 9 is a specific space between the baffle 8 and the sealing plate 6. When the sealing plate 6 presses against the baffle 8, the moving volume 9 closes, and the purified gas stops being emitted. Instead, the gas discharged from the backflush port 20 is used to backflush the purified gas discharge port 14 to prevent blockage. When the sealing plate 6 moves away from the baffle 8, the moving volume 9 opens, indicating that the gas pressure in the particle collection tube 5 is stable. After post-treatment, the gas is directly discharged from the purified gas discharge port 14 and finally enters the moving volume 9, and then enters the outlet pipe 3 for external discharge.

[0029] In another embodiment, the end of the variable diameter chamber 16 connected to the exhaust chamber 13 is provided with an end face limiting part 23. After the control plate 19 moves axially to reset, it abuts against the limiting part 23 to form a stroke limit. When the control plate 19 moves to a predetermined position during the reset process, its end face contacts the end face limiting part 23, thereby preventing the control plate 19 from continuing to move in that direction, realizing precise stroke control, and ensuring that the backflush port 20 switches from closed to open.

[0030] Working principle: Exhaust gas first enters the integrated pipe 1 through the inlet pipe 2, and then flows to the particulate collection pipe 5 inside the outer cover 4. The particulate collection pipe 5 has a catalytic chamber 17 inside, which contains a catalyst used to capture particulate matter in the exhaust gas and promote its oxidation and regeneration. Under normal operating conditions, the purified gas treated by the catalytic chamber 17 is discharged through the purified gas discharge hole 14 on the wall of the particulate collection pipe 5, enters the gas discharge channel 15 formed between the outer cover 4 and the outer wall of the particulate collection pipe 5, and is finally discharged into the atmosphere through the moving volume 9 and the outlet pipe 3. The outer wall of the particulate collection pipe 5 has an outwardly protruding shoulder 11, and a first spring 12 connects the shoulder 11 to the inner wall of the outlet end of the outer cover 4 to support and buffer the particulate collection pipe 5. An exhaust chamber 13 is provided at the end of the particulate collection pipe 5 near the inlet end, and the purified gas discharge holes 14 are arranged in a ring array on the exhaust chamber 13.

[0031] With prolonged vehicle operation, even after catalytic regeneration, some incompletely oxidized or newly generated extremely fine particles may still flow out with the purified gas and gradually adhere to the inner wall or edge of the purified gas emission port 14, causing these emission ports 14 to gradually become blocked. When the blockage of the purified gas emission port 14 reaches a certain level, the gas emission in the catalytic chamber 17 is obstructed, causing the gas pressure inside the catalytic chamber 17 to begin to rise. At this time, the gas pressure response mechanism provided on the particulate collection tube 5 begins to function. This gas pressure response mechanism includes a control plate 19 fixed to the core seat 18 inside the catalytic chamber 17, and the control plate 19 is slidably disposed inside the catalytic chamber 17. The gas pressure response mechanism also includes a second spring 21 that provides an elastic restoring force to the control plate 19. One end of the second spring 21 abuts against the control plate 19, and the other end abuts against the sealing plate 6 provided at the gas outlet end of the particulate collection tube 5. A filter element baffle 22 is fixed on the core seat 18, and the filter element baffle 22 slides in contact with the cavity wall of the catalytic chamber 17. The particulate collection pipe 5 has a variable diameter cavity 16 at one end where the sealing plate 6 is installed. The two ends of the catalytic chamber 17 are connected to the exhaust chamber 13 and the variable diameter cavity 16. The control plate 19 is in sliding contact with the cavity wall of the variable diameter cavity 16.

[0032] When the gas pressure inside the catalytic chamber 17 continues to rise, and the force exerted on the control plate 19 exceeds the preload of the second spring 21, the control plate 19 moves towards the sealing plate 6 under the action of the pressure difference, overcoming the elastic force of the second spring 21. The movement of the control plate 19 opens the inlet of the backflush vent 20, which was originally blocked by it. The backflush vent 20 is arranged in a ring array on the shoulder 11, with its inner end connected to the catalytic chamber 17 and its outer end connected to the gas emission channel 15. The outlet of the backflush vent 20 faces the purified gas emission port 14. After the backflush vent 20 opens, the high-pressure gas inside the catalytic chamber 17 is ejected at high speed through the backflush vent 20. At the same time, the increased gas pressure inside the catalytic chamber 17 pushes the particulate trap 5 to move towards the outlet pipe 3, overcoming the elastic force of the first spring 12. This causes the sealing plate 6 to temporarily close the inlet of the outlet pipe 3, resulting in a further accumulation and increase in gas pressure inside the catalytic chamber 17, forming a stronger pulse jet. These high-speed airflows are blown along the outer wall of the tapered particle collection tube 5 toward the purified gas discharge port 14. Due to the high kinetic energy of the airflow, it can effectively impact and sweep away the particles attached to the purified gas discharge port 14, peeling them off the port wall and re-blowing them into the catalytic chamber 17 for catalytic treatment, thus achieving automatic cleaning.

[0033] Compared to existing technologies where fixed exhaust ports are prone to clogging and lack an active cleaning mechanism, this solution introduces a pressure response mechanism and a backflush port 20 to achieve on-demand, automatic cleaning of the purified gas exhaust port 14. When the purified gas exhaust port 14 becomes clogged, causing the gas pressure inside the catalytic chamber 17 to rise to a first threshold, the pressure response mechanism activates, and the backflush port 20 opens, utilizing the self-pressure within the catalytic chamber 17 for backflush cleaning, eliminating the need for an additional power source or complex control system.

[0034] As the purified gas exhaust port 14 is cleaned, the gas pressure inside the catalytic converter chamber 17 gradually decreases. When the gas pressure inside the catalytic converter chamber 17 drops to the second threshold, the force exerted by the gas pressure on the control plate 19 decreases, and the elastic restoring force of the second spring 21 pushes the control plate 19 back to its initial position. One end of the variable diameter chamber 16 connected to the exhaust chamber 13 is provided with an end face limiting part 23. After the control plate 19 undergoes axial reset movement, it abuts against the limiting part 23 to form a stroke limit. After the control plate 19 resets, it again seals the inlet of the backflush port 20, closing the backflush port 20. The entire cleaning process is completed automatically, ensuring the long-term efficient operation of the particulate filter, maintaining the normal performance of the engine, and extending the service life of the aftertreatment system.

[0035] Supplementary Explanation: The specific values ​​of the first and second thresholds are determined by the structural parameters and preload of the first spring. The elastic resistance generated by the first spring under high-pressure gas pressure directly serves as the core basis for threshold setting. That is, the first threshold corresponds to the maximum elastic support force that the first spring can withstand. When the pressure exerted on the first spring by the gas pressure inside the catalytic chamber exceeds this support force, the first spring is compressed, triggering the gas pressure response mechanism. The second threshold corresponds to the initial preload of the first spring. When the gas pressure inside the catalytic chamber decreases and the pressure exerted on the first spring is lower than this preload, the first spring resets, causing the gas pressure response mechanism to close the backflush vent, adapting to actual pressure changes and cleaning requirements under actual working conditions. In this embodiment, the inner wall or interior of the catalytic chamber 17 is filled with a catalyst coating known in the art, such as a precious metal catalyst, used for catalytic oxidation of captured particulate matter to achieve passive regeneration. The specific type of catalyst, coating amount, and coating process can employ existing technologies, and will not be elaborated here.

[0036] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations of the references. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0037] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vehicle exhaust aftertreatment assembly with a particulate trap, comprising an integrated pipe (1), wherein an intake pipe (2) is connected to the intake end of the integrated pipe (1), and an exhaust pipe (3) is connected to the exhaust end; an outer cover (4) is connected between the intake pipe (2) and the exhaust pipe (3), and a particulate trap (5) is provided inside the outer cover (4), characterized in that: The particle collection tube (5) is provided with a catalytic chamber (17) inside, and a purified gas discharge hole (14) is opened on its tube wall to discharge the purified gas; a gas discharge channel (15) is formed between the outer cover (4) and the outer wall of the particle collection tube (5) and is connected to the gas outlet pipe (3). The particle collection tube (5) is also provided with a backflush port (20), the outlet of the backflush port (20) faces the purified gas discharge port (14), and the inlet is connected to the catalyst chamber (17); The outer wall of the particle collecting tube (5) is provided with an outwardly protruding shoulder (11), and a first spring (12) is connected between the shoulder (11) and the inner wall of the air outlet of the outer cover (4), so that the particle collecting tube (5) can move along the axial direction. The particle collection tube (5) is provided with a pressure response mechanism, which includes a control plate (19) slidably disposed in the catalyst chamber (17) and a second spring (21) that provides elastic restoring force to the control plate (19); the control plate (19) is used to block or open the inlet of the backflush vent (20); When the gas discharge port (14) of the purified gas is blocked, causing the gas pressure in the catalytic chamber (17) to rise, the gas pressure response mechanism is activated, causing the backflush port (20) to open. At the same time, the gas pressure in the catalytic chamber (17) pushes the particle collection tube (5) to move towards the outlet pipe (3) against the elastic force of the first spring (12) until the sealing plate (6) closes the inlet of the outlet pipe (3), causing the gas pressure in the catalytic chamber (17) to rise further. The gas is then blown at high speed through the backflush port (20) to the gas discharge port (14) for cleaning. When the blockage is cleared, the gas pressure in the catalytic chamber (17) drops, the first spring (12) pushes the particle collection tube (5) to reset, the outlet pipe (3) reopens, and the second spring (21) pushes the control plate (19) to reset and close the backflush port (20).

2. The automotive exhaust aftertreatment assembly with a particulate filter according to claim 1, characterized in that, The particulate collection tube (5) has an exhaust chamber (13) at one end near the air inlet. There are several purified gas discharge holes (14) arranged in a ring array on the exhaust chamber (13). There are several backflush holes (20) arranged in a ring array on the shoulder (11). The inner end of the backflush hole (20) is connected to the catalyst chamber (17), and the outer end is connected to the gas discharge channel (15). The gas outlet path blows along the outer wall of the particulate collection tube (5) toward the purified gas discharge hole (14).

3. The automotive exhaust aftertreatment assembly with a particulate filter according to claim 1, characterized in that, The catalyst chamber (17) is provided with a core seat (18), and the control board (19) is fixed on the core seat (18).

4. The automotive exhaust aftertreatment assembly with a particulate filter according to claim 3, characterized in that, A filter element baffle (22) is fixed on the core seat (18), and the filter element baffle (22) slides in contact with the cavity wall of the catalyst chamber (17).

5. The automotive exhaust aftertreatment assembly with a particulate filter according to claim 4, characterized in that, The air outlet of the particle collection tube (5) is provided with a sealing plate (6), and one end of the second spring (21) abuts against the control plate (19), and the other end abuts against the sealing plate (6).

6. The automotive exhaust aftertreatment assembly with a particulate filter according to claim 5, characterized in that, The particulate collection pipe (5) is provided with a variable diameter cavity (16) at one end of the sealing plate (6). The two ends of the catalytic chamber (17) are connected to the exhaust chamber (13) and the variable diameter cavity (16). The control plate (19) is in sliding contact with the cavity wall of the variable diameter cavity (16).

7. The automotive exhaust aftertreatment assembly with a particulate filter according to claim 6, characterized in that, The inner wall of the air outlet of the particle collection tube (5) is provided with a cavity (7), a baffle (8) is fixed in the cavity (7), and an air outlet (10) is provided on the baffle (8). A moving volume (9) is formed between the baffle (8) and the sealing plate (6). The two ends of the air outlet (10) are connected to the air outlet tube (3) and the moving volume (9).

8. The automotive exhaust aftertreatment assembly with a particulate filter according to claim 7, characterized in that, The variable diameter cavity (16) is connected to the exhaust cavity (13) at one end with an end face limiting part (23). After the control plate (19) moves axially to reset, it abuts against the limiting part (23) to form a stroke limit.

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