Exhaust aftertreatment system and vehicle

Abstract

The utility model belongs to the technical field of vehicles, and discloses an exhaust aftertreatment system and a vehicle, the exhaust aftertreatment system comprises a catalytic converter, a particle catcher and a separator, the separator is located between the catalytic converter and the particle catcher, and the separator is provided with a separation cavity, a first exhaust channel and a second exhaust channel; the first exhaust channel and the second exhaust channel communicate with the particle catcher, a catalytic conversion filter element is arranged in the second exhaust cavity, and the separation cavity can separate the particles according to the particle size of the particles, so that the particles with the particle size smaller than a set value enter the particle catcher through the first exhaust channel. The particulate matter with the particle size larger than the set value enters the second exhaust channel, is treated by the catalytic conversion filter element and then enters the particulate trapper, so that the time required for saturation of the carbon loading capacity of the particulate trapper is prolonged, the regeneration frequency of the particulate trapper is reduced, and the service life of the particulate trapper is guaranteed.

Description

Technical Field

[0001] This application belongs to the technical field of vehicles, specifically relating to an exhaust aftertreatment system and a vehicle. Background Technology

[0002] An automobile is a non-rail-mounted vehicle driven by a power unit and equipped with multiple wheels. It is mainly used to transport people and goods and is one of the most important means of transportation in modern society. As one of the power units of an automobile, the engine provides power to the vehicle through the combustion of fuel. In order to meet the requirements of environmental protection regulations, vehicles are generally required to be equipped with an exhaust aftertreatment system to reduce pollutant emissions during engine operation.

[0003] With increasingly stringent environmental regulations, exhaust aftertreatment systems typically include particulate filters to capture and treat particulate matter in exhaust gases, further reducing emissions. As more particulate matter accumulates on the particulate filter, it needs to burn it at high temperatures to restore its filtration efficiency. However, since exhaust gases treated by the catalytic converter directly enter the particulate filter, large particulate matter particles can easily enter, causing rapid carbon saturation. This necessitates frequent regeneration cycles, which not only increases fuel consumption and heat loss but also causes stress damage to the filter's carrier material due to repeated high temperatures, thus affecting its lifespan. Utility Model Content

[0004] This application provides an exhaust aftertreatment system that reduces the frequency of particulate filter regeneration, decreases engine fuel consumption and heat loss, and extends the service life of the particulate filter.

[0005] The technical solution adopted in this application is as follows:

[0006] An exhaust aftertreatment system includes a catalytic converter, a particulate filter, and a separator located between the catalytic converter and the particulate filter. The separator has a separation chamber communicating with the catalytic converter and a first exhaust passage and a second exhaust passage communicating with the separation chamber. Both the first exhaust passage and the second exhaust passage are connected to the particulate filter. A catalytic converter filter element is disposed in the second exhaust passage. The separation chamber is capable of separating particulate matter according to its particle size, so that particulate matter with a particle size smaller than a set value enters the particulate filter through the first exhaust passage, while particulate matter with a particle size larger than the set value enters the second exhaust passage, is treated by the catalytic converter filter element, and then enters the particulate filter.

[0007] By adopting the above technical solution, when installing the exhaust aftertreatment system in this application, the catalytic converter is connected to the exhaust port of the engine so that the exhaust gas generated by the engine directly enters the catalytic converter.

[0008] When the engine is running, the exhaust gas produced by the engine enters the catalytic converter, where the catalytic converter performs an oxidation-reduction reaction to treat the exhaust gas. The exhaust gas treated by the catalytic converter enters the separator, and then enters the separation chamber, where the separation chamber separates the exhaust gas. Soot particles with a diameter smaller than a set value in the exhaust gas directly enter the particulate filter through the first exhaust channel, while soot particles with a diameter larger than the set value enter the second exhaust channel. The catalytic converter filter element located in the second exhaust channel performs an oxidation-reduction reaction to treat the soot particles, thereby reducing the diameter of the soot particles or eliminating the soot particles. Finally, the exhaust gas in the second exhaust channel enters the particulate filter.

[0009] The exhaust aftertreatment system in this application uses a separator to separate carbon soot particles larger than a set value into a second exhaust channel. A catalytic converter filter element located in the second exhaust channel then performs an oxidation-reduction reaction on these larger particles, preventing them from directly entering the particulate filter. This extends the time required for the particulate filter to reach carbon saturation, reducing the frequency of filter regeneration. This avoids increased fuel consumption and heat loss due to frequent regeneration cycles, thus lowering engine fuel consumption and heat loss. Furthermore, it prevents stress damage to the filter's carrier material caused by repeated high temperatures, thereby extending the particulate filter's service life.

[0010] Optionally, the separator includes a circular cross-section housing, an air inlet pipe disposed in the housing, and a central pipe disposed inside the housing. The housing has an air inlet end and an air outlet end opposite to the air inlet end. The air inlet pipe is disposed at the air inlet end and is tangential to the inner circumferential surface of the housing. The central pipe is located at the air outlet end. A first exhaust channel is formed inside the central pipe. A second exhaust channel is formed between the central pipe and the inner wall of the housing.

[0011] By adopting the above technical solution, since the cross-section of the shell is circular and the intake pipe is tangentially set to the inner circumferential surface of the shell, the exhaust gas after the reaction of the catalytic converter enters the interior of the shell in the tangential direction of the inner circumferential surface of the shell. This allows for the separation of carbon soot particles using centrifugal force. Specifically, larger carbon soot particles are thrown towards the inner circumferential surface of the shell under the action of centrifugal force. Once the larger carbon soot particles come into contact with the inner circumferential surface of the shell, they lose inertial force and fall along the inner wall of the shell due to the momentum of the downward axial velocity near the inner circumferential surface of the shell. This allows the larger carbon soot particles to enter the second exhaust channel formed between the central pipe and the inner wall of the shell, while the smaller carbon soot particles enter the first exhaust channel formed inside the central pipe. This achieves the separation of carbon soot particles according to their particle size.

[0012] Optionally, the housing includes an intake section, a first guide section, and an exhaust section arranged sequentially. The diameter of the intake section is larger than the diameter of the exhaust section. The diameter of the first guide section gradually decreases along the direction from the intake section to the exhaust section. The separation chamber is formed inside the intake section. The central tube is located in the exhaust section. The catalytic converter filter element is located inside the exhaust section.

[0013] By adopting the above technical solution, since the diameter of the first guide section gradually decreases along the direction from the intake section to the exhaust section, the first guide section can guide larger carbon soot particles into the exhaust section, thereby avoiding the situation where carbon soot particles adhere to the inner wall of the intake section to a certain extent; at the same time, it can also reduce the internal space of the shell to a certain extent, so as to ensure the airflow pressure of the exhaust gas.

[0014] Optionally, the housing further includes a second guide section located at the end of the exhaust section opposite to the first guide section. The central tube extends in a direction opposite to the first guide section. The diameter of the second guide section gradually decreases in a direction away from the exhaust section. The end of the second guide section away from the exhaust section is connected to the central tube, so that an exhaust gas chamber is formed between the central tube and the second guide section. The central tube is provided with a communication hole communicating with the exhaust gas chamber.

[0015] By adopting the above technical solution, the exhaust gas entering the second exhaust channel is treated by the oxidation-reduction reaction of the catalytic conversion filter element and then enters the exhaust gas chamber. Finally, the exhaust gas enters the end of the central pipe away from the intake section through the connecting hole, so that all the exhaust gas enters the particulate filter through the central pipe, thereby reducing the volume of the separator and making it easier to arrange the separator.

[0016] Optionally, multiple connecting holes are provided, and at least some of the connecting holes are located at the end of the exhaust gas chamber away from the catalytic conversion filter element.

[0017] By adopting the above technical solution, since at least some of the connecting holes are located at the end of the exhaust gas chamber away from the catalytic conversion filter element, the exhaust gas entering the exhaust gas chamber can enter the central pipe as much as possible, so as to avoid the accumulation of carbon soot particles in the exhaust gas chamber, thereby ensuring the cleanliness of the exhaust gas chamber.

[0018] Optionally, a first bushing is provided between the central tube and the catalytic converter filter element, and a second bushing is provided between the catalytic converter filter element and the exhaust section.

[0019] By adopting the above technical solution, since a first bushing is provided between the central tube and the catalytic converter filter element, and a second bushing is provided between the catalytic converter filter element and the exhaust section, on the one hand, the catalytic converter filter element can be fixed inside the housing by using the first bushing and the second bushing to increase the stability of the catalytic converter filter element. On the other hand, the first bushing can be used to increase the sealing between the catalytic converter filter element and the central tube, and the second bushing can be used to increase the sealing between the catalytic converter filter element and the exhaust section, so as to ensure the oxidation reaction effect of the catalytic converter filter element on soot particles.

[0020] Optionally, the central tube is provided with a guide cover located in the first guide section, and the inner diameter of the guide cover gradually increases in the direction away from the central tube.

[0021] By adopting the above technical solution, since the guide hood is located in the first guide section and the inner diameter of the guide hood gradually increases in the direction away from the central tube, on the one hand, more small carbon soot particles can enter the central tube, and on the other hand, the guide hood can guide the small carbon soot particles to improve the smoothness of the small carbon soot particles entering the central tube.

[0022] Optionally, the intake pipe has an intake side connected to the catalytic converter and an outlet side connected to the housing, wherein the axial dimension of the intake side in the housing is smaller than the axial dimension of the outlet side in the housing.

[0023] By adopting the above technical solution, since the size of the air inlet side in the axial direction of the housing is smaller than that of the air outlet side in the axial direction of the housing, more exhaust gas can enter the separation chamber along the inner wall of the housing, thereby reducing the kinetic energy loss of the exhaust gas and ensuring the separation efficiency of carbon soot particles.

[0024] Optionally, the housing has a central axis, which is set at an angle to the horizontal plane;

[0025] And / or, the central tube is coaxially arranged with the housing;

[0026] And / or, the catalytic conversion filter element is fitted over the outside of the central tube.

[0027] By adopting the above technical solution, since the central axis of the shell is set at an angle to the horizontal plane, the separation efficiency of the separator for carbon soot particles can be guaranteed.

[0028] Because the central tube is coaxially arranged with the housing, it can ensure that all small carbon soot particles enter the first exhaust channel, while all large carbon soot particles can enter the second exhaust channel formed between the central tube and the exhaust section, thereby improving the separation effect of carbon soot particles.

[0029] Since the catalytic converter filter element is fitted outside the central tube, it increases the structural strength of the catalytic converter filter element on the one hand, and improves the oxidation-reduction reaction effect of the catalytic converter filter element on carbon soot particles on the other hand.

[0030] This application also discloses a vehicle to reduce fuel consumption and heat loss, increase the service life of the particulate filter, and reduce the vehicle's failure rate.

[0031] A vehicle including the exhaust aftertreatment system as described above.

[0032] By adopting the above technical solution, since the vehicle in this application uses the exhaust aftertreatment system, it avoids the direct entry of large-diameter carbon particulate matter into the particulate filter, thereby extending the time required for the particulate filter to reach carbon saturation, reducing the frequency of particulate filter regeneration, and reducing the increase in fuel consumption and heat loss caused by frequent start-up of the particulate filter regeneration process. This achieves the effect of reducing vehicle fuel consumption and heat loss, while also reducing stress damage to the particulate filter carrier material to ensure the service life of the particulate filter, thereby reducing the vehicle's failure rate.

[0033] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0034] 1. The exhaust aftertreatment system of this application includes a catalyst, a particulate filter, and a separator located between the catalytic converter and the particulate filter. The separator has a separation chamber communicating with the catalytic converter and a first exhaust passage and a second exhaust passage communicating with the separation chamber. Both the first exhaust passage and the second exhaust passage are connected to the particulate filter. A catalytic converter filter element is installed in the second exhaust passage. The separation chamber can separate particulate matter according to its particle size, so that particulate matter smaller than a set value enters the particulate filter through the first exhaust passage, while particulate matter larger than the set value enters the second exhaust passage, is processed by the catalytic converter filter element, and then enters the particulate filter. This avoids the situation where large carbon soot particles directly enter the particulate filter, thereby extending the time required for the carbon load of the particulate filter to saturate, reducing the frequency of regeneration of the particulate filter, and avoiding the increase in engine fuel consumption and heat loss due to frequent regeneration. This reduces engine fuel consumption and heat loss, and at the same time avoids stress damage to the carrier material of the particulate filter caused by repeated high temperatures, thereby improving the service life of the particulate filter.

[0035] 2. The separator in this application includes a circular cross-section shell, an inlet pipe disposed in the shell, and a central pipe disposed inside the shell. The shell has an inlet end and an outlet end opposite to the inlet end. The inlet pipe is disposed at the inlet end and tangentially disposed to the shell. The central pipe is located at the outlet end. A first exhaust channel is formed inside the central pipe, and a second exhaust channel is formed between the central pipe and the inner wall of the shell. This allows for the separation of carbon soot particles using centrifugal force. Specifically, larger carbon soot particles have a greater centrifugal force and move to the side of the shell, while smaller carbon soot particles have a smaller centrifugal force and move to the center of the shell. This allows larger carbon soot particles to enter the second exhaust channel formed between the central pipe and the inner wall of the shell, while smaller carbon soot particles enter the first exhaust channel formed inside the central pipe, thereby achieving the separation of carbon soot particles according to their particle size.

[0036] 3. The housing in this application includes an intake section, a first guide section, and an exhaust section arranged sequentially. The diameter of the intake section is larger than that of the exhaust section. The diameter of the first guide section gradually decreases along the direction from the intake section to the exhaust section. A separation chamber is formed inside the intake section. The central tube is located in the exhaust section, and the catalytic converter filter element is located inside the exhaust section. This allows the first guide section to guide larger carbon soot particles into the exhaust section, thereby avoiding carbon soot particles from adhering to the inner wall of the intake section to a certain extent. At the same time, it can also reduce the internal space of the housing to a certain extent to ensure the airflow pressure of the exhaust gas. Attached Figure Description

[0037] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0038] Figure 1 This is a schematic diagram of the exhaust aftertreatment system described in one embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the separator described in one embodiment of this application;

[0040] Figure 3 This is a cross-sectional view of the separator described in one embodiment of this application;

[0041] Figure 4 This is a cross-sectional view of the separator described in one embodiment of this application, mainly showing the tangency between the intake pipe and the housing;

[0042] Figure 5 This is a schematic diagram of the separator described in another embodiment of this application.

[0043] Figure label:

[0044] 1. Catalytic converter; 2. Particulate filter; 3. Separator; 31. Housing; 311. Intake section; 312. First guide section; 313. Exhaust section; 314. Second guide section; 315. Second bushing; 316. Second exhaust passage; 317. Catalytic converter filter element; 318. Exhaust gas chamber; 319. Connecting hole; 32. Intake pipe; 321. Separation chamber; 33. Central pipe; 331. First exhaust passage; 332. First bushing; 333. Guide cover; 34. Main intake pipe; 35. First exhaust pipe; 36. Second exhaust pipe; 37. Filter screen. Detailed Implementation

[0045] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0047] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0050] Reference Figures 1 to 5 An exhaust aftertreatment system is disclosed, comprising a catalytic converter 1, a particulate filter 2, and a separator 3 located between the catalytic converter 1 and the particulate filter 2. The separator 3 has a separation chamber 321 communicating with the catalytic converter 1 and a first exhaust passage 331 and a second exhaust passage 316 communicating with the separation chamber 321. Both the first exhaust passage 331 and the second exhaust passage 316 are connected to the particulate filter 2. A catalytic converter filter element 317 is provided in the second exhaust passage 316. The separation chamber 321 can separate particulate matter according to the particle size, so that particulate matter with a particle size smaller than a set value enters the particulate filter 2 through the first exhaust passage 331, and particulate matter with a particle size larger than the set value enters the second exhaust passage 316, is treated by the catalytic converter filter element 317, and then enters the particulate filter 2.

[0051] It is understandable that the catalytic converter 1 has a filter element inside, which is made of ceramic support and precious metal catalyst, and the catalytic conversion filter element 317 is made of the same material as the filter element inside the catalytic converter 1.

[0052] When installing the exhaust aftertreatment system of this application, the catalytic converter 1 is connected to the exhaust port of the engine so that the exhaust gas generated by the engine directly enters the catalytic converter 1.

[0053] When the engine is running, the exhaust gas produced by the engine enters the catalytic converter 1, where the catalytic converter 1 performs an oxidation-reduction reaction on the exhaust gas. The exhaust gas treated by the catalytic converter 1 enters the separator 3, and then enters the separation chamber 321, where the separation chamber 321 separates the exhaust gas. Thus, carbon soot particles with a particle size smaller than a set value in the exhaust gas directly enter the particulate filter 2 through the first exhaust passage 331, while carbon soot particles with a particle size larger than the set value enter the second exhaust passage 316. The catalytic converter filter element 317 installed in the second exhaust passage 316 performs an oxidation-reduction reaction on the carbon soot particles, thereby reducing the particle size of the carbon soot particles or eliminating the carbon soot particles. Finally, the exhaust gas in the second exhaust passage 316 enters the particulate filter 2.

[0054] The exhaust aftertreatment system in this application uses a separator 3 to separate carbon soot particles larger than a set value into a second exhaust channel 316. A catalytic converter filter 317 located in the second exhaust channel 316 then performs an oxidation-reduction reaction on these particles, preventing them from directly entering the particulate filter 2. This extends the time required for the particulate filter 2 to reach carbon saturation, reducing the frequency of regeneration and avoiding increased fuel consumption and heat loss due to frequent regeneration cycles. Furthermore, it prevents stress damage to the carrier material of the particulate filter 2 caused by repeated high temperatures, thereby improving its service life.

[0055] This application does not impose specific limitations on the structure of separator 3, which can adopt any of the following embodiments:

[0056] Implementation Method 1, in this implementation method, refer to Figures 1 to 3The separator 3 includes a circular cross-section housing 31, an air inlet pipe 32 disposed in the housing 31, and a central pipe 33 disposed inside the housing 31. The housing 31 has an air inlet end and an air outlet end opposite to the air inlet end. The air inlet pipe 32 is disposed at the air inlet end and is tangent to the inner circumferential surface of the housing 31. The central pipe 33 is located at the air outlet end. A first exhaust channel 331 is formed inside the central pipe 33. A second exhaust channel 316 is formed between the central pipe 33 and the inner wall of the housing 31.

[0057] It is understandable that the air inlet pipe 32 is located outside the housing 31, and the housing 31, the air inlet pipe 32, and the central pipe 33 together constitute the cyclone separator.

[0058] It should be noted that the inner wall of the intake pipe 32 has an inner wall near the central axis of the housing and an outer wall opposite to the inner wall. The aforementioned tangential arrangement of the intake pipe 32 and the inner circumferential surface of the housing 31 refers to the tangential arrangement of the outer inner wall of the intake pipe 32 and the inner circumferential surface of the housing 31 (e.g., Figure 4 (As shown).

[0059] Because the cross-section of the housing 31 is circular and the intake pipe 32 is tangential to the inner circumferential surface of the housing 31, the exhaust gas after being reacted by the catalytic converter 1 enters the interior of the housing 31 in the tangential direction of the inner circumferential surface of the housing 31, so that the exhaust gas changes from linear motion to circular motion. This allows for the separation of carbon soot particles using centrifugal force. Larger carbon soot particles are thrown toward the inner circumferential surface of the housing 31 under the action of centrifugal force. Once the larger carbon soot particles come into contact with the inner circumferential surface of the housing 31, they lose inertia and fall along the inner wall of the housing 31 due to the momentum of the downward axial velocity of the inner circumferential surface attachment. Finally, the larger carbon soot particles enter the second exhaust channel 316 formed between the central pipe 33 and the inner wall of the housing 31, while the smaller carbon soot particles enter the first exhaust channel 331 formed inside the central pipe 33, thereby achieving the separation of carbon soot particles according to their particle size.

[0060] Furthermore, refer to Figure 2 and Figure 3 The housing 31 includes an intake section 311, a first guide section 312, and an exhaust section 313 arranged sequentially. The diameter of the intake section 311 is larger than the diameter of the exhaust section 313. The diameter of the first guide section 312 gradually decreases along the direction from the intake section 311 to the exhaust section 313. A separation chamber 321 is formed inside the intake section 311. A central tube 33 is located in the exhaust section 313. A catalytic converter filter element 317 is located inside the exhaust section 313.

[0061] It is understandable that the intake section 311, the first guide section 312, and the exhaust section 313 are arranged sequentially along the axial direction of the housing 31, and the three are arranged coaxially.

[0062] Since the diameter of the first guide section 312 gradually decreases along the direction from the intake section 311 to the exhaust section 313, the first guide section 312 can guide larger carbon soot particles to the exhaust section 313, thereby avoiding carbon soot particles from adhering to the inner wall of the intake section 311 to a certain extent; at the same time, it can also reduce the internal space of the housing 31 to a certain extent, so as to ensure the airflow pressure of the exhaust gas.

[0063] This application does not specifically limit the connection method between the first exhaust channel 331 and the second exhaust channel 316 and the particulate filter 2. Preferably, refer to Figure 2 and Figure 3 The housing 31 also includes a second guide section 314 located at the end of the exhaust section 313 away from the first guide section 312. The central tube 33 extends in the direction away from the first guide section 312. The diameter of the second guide section 314 gradually decreases in the direction away from the exhaust section 313. The end of the second guide section 314 away from the exhaust section 313 is connected to the central tube 33, so that an exhaust gas chamber 318 is formed between the central tube 33 and the second guide section 314. The central tube 33 is provided with a connecting hole 319 that communicates with the exhaust gas chamber 318.

[0064] It is understandable that the inner diameter of the second guide section 314 at the end furthest from the exhaust section 313 is equal to the outer diameter of the central pipe 33, and the central pipe 33 is connected to the particulate trap 2 through a pipe.

[0065] The exhaust gas entering the second exhaust passage 316 is treated by the oxidation-reduction reaction of the catalytic conversion filter element 317 and then enters the exhaust gas chamber 318. Finally, the exhaust gas enters the end of the central pipe 33 away from the intake section 311 through the connecting hole 319, so that all the exhaust gas enters the particulate filter 2 through the central pipe 33, thereby reducing the volume of the separator 3 and making it easier to arrange the separator 3.

[0066] Furthermore, refer to Figure 3 Multiple connecting holes 319 are provided, and at least some of the connecting holes 319 are located at the end of the exhaust gas chamber 318 away from the catalytic conversion filter element 317.

[0067] Since at least part of the connecting hole 319 is located at the end of the exhaust gas chamber 318 away from the catalytic conversion filter element 317, the exhaust gas entering the exhaust gas chamber 318 can enter the central pipe 33 as much as possible, so as to avoid the accumulation of carbon soot particles in the exhaust gas in the exhaust gas chamber 318, thereby ensuring the cleanliness of the exhaust gas chamber 318.

[0068] Preferably, multiple connecting holes 319 are provided at intervals along the circumference and axial direction of the central tube 33 to increase the communication area between the first exhaust channel 331 and the exhaust gas chamber 318, thereby ensuring the efficiency of gas entering the first exhaust channel 331 from the exhaust gas chamber 318.

[0069] In other implementation examples, the second guide section 314 can be omitted, and the exhaust section 313 can be directly connected to the housing of the particulate filter 2, with the central tube 33 extending into the housing of the particulate filter 2, in order to reduce the volume of the exhaust aftertreatment system and facilitate the arrangement of the exhaust aftertreatment system.

[0070] This application does not specify a particular method for installing the catalytic converter filter element 317; preferably, refer to... Figure 3 A first bushing 332 is provided between the central tube 33 and the catalytic converter filter element 317, and a second bushing 315 is provided between the catalytic converter filter element 317 and the exhaust section 313.

[0071] Understandably, the inner circumferential surface of the first bushing 332 contacts the outer circumferential surface of the central pipe 33, the outer circumferential surface of the first bushing 332 contacts the inner circumferential surface of the catalytic converter filter element 317, the inner circumferential surface of the second bushing 315 contacts the outer circumferential surface of the catalytic converter filter element 317, and the inner circumferential surface of the second bushing 315 contacts the inner circumferential surface of the exhaust section 313.

[0072] Since a first bushing 332 is provided between the central tube 33 and the catalytic converter filter element 317, and a second bushing 315 is provided between the catalytic converter filter element 317 and the exhaust section 313, the catalytic converter filter element 317 can be fixed inside the housing 31 using the first bushing 332 and the second bushing 315 to increase the stability of the catalytic converter filter element 317. On the other hand, the first bushing 332 can increase the sealing between the catalytic converter filter element 317 and the central tube 33, and the second bushing 315 can increase the sealing between the catalytic converter filter element 317 and the exhaust section 313, so as to ensure the oxidation reaction effect of the catalytic converter filter element 317 on soot particles.

[0073] This application does not specifically limit the materials used to manufacture the first bushing 332 and the second bushing 315. Preferably, both the first bushing 332 and the second bushing 315 are made of ceramic fiber or polycrystalline fiber (such as polycrystalline alumina fiber) to improve the high-temperature stability of the first bushing 332 and the second bushing 315 and reduce their thermal conductivity. In other embodiments, the first bushing 332 and the second bushing 315 may also be made of other materials, such as steel or other high-temperature resistant materials.

[0074] In other embodiments, the catalytic conversion filter element 317 can also be fixed inside the housing 31 by means of fasteners or snap-fit ​​fasteners.

[0075] Furthermore, refer to Figure 3 The central tube 33 is provided with a guide cover 333 located in the first guide section 312, and the inner diameter of the guide cover 333 gradually increases in the direction away from the central tube 33.

[0076] It is understandable that there is a gap between the end of the guide cover 333 away from the central tube 33 and the inner wall of the first guide section 312.

[0077] Since the guide shroud 333 is located in the first guide section 312, and the inner diameter of the guide shroud 333 is gradually increased in the direction away from the central tube 33, it can allow more small carbon soot particles to enter the central tube 33 on the one hand, and guide the small carbon soot particles on the other hand, thereby improving the smoothness of the small carbon soot particles entering the central tube 33.

[0078] Furthermore, refer to Figure 1 and Figure 2 The intake pipe 32 has an intake side connected to the catalytic converter 1 and an outlet side connected to the housing 31. The axial dimension of the intake side in the housing 31 is smaller than the axial dimension of the outlet side in the housing 31.

[0079] Since the axial dimension of the intake side of the housing 31 is smaller than that of the exhaust side of the housing 31, more exhaust gas can enter the separation chamber 321 along the inner wall of the housing 31, thereby reducing the kinetic energy loss of the exhaust gas and ensuring the separation efficiency of carbon soot particles.

[0080] Preferably, the cross-sectional shape of the air intake side is circular, and the cross-sectional shape of the air outlet side is racetrack-shaped, in order to further ensure the separation efficiency of carbon soot particles.

[0081] In a preferred embodiment, the housing 31 has a central axis that is angled to the horizontal plane, thereby ensuring the separation efficiency of the separator 3 for carbon soot particles.

[0082] It should be noted that the horizontal plane refers to the horizontal plane on which the vehicle is located after the exhaust aftertreatment system is installed; and the position of the air intake end of the housing 31 is higher than the position of the air outlet end of the housing 31.

[0083] Preferably, the central axis of the housing 31 is arranged perpendicular to the horizontal plane, and the intake section 311, the first guide section 312, the exhaust section 313 and the second guide section 314 are arranged sequentially from top to bottom to improve the separation efficiency of the separator 3 for carbon soot particles.

[0084] Of course, in other implementation examples, the central axis of the housing 31 can also be set at other angles with the horizontal plane, such as 85°, 80°, etc., to facilitate the installation of the separator 3.

[0085] In a preferred embodiment, refer to Figure 3 The central tube 33 is coaxially arranged with the housing 31, which ensures that all small carbon soot particles enter the first exhaust channel 331, while all large carbon soot particles enter the second exhaust channel 316 formed between the central tube 33 and the exhaust section 313, thereby improving the separation effect of carbon soot particles.

[0086] In a preferred embodiment, refer to Figure 3 The catalytic conversion filter element 317 is fitted outside the central tube 33. In other words, the catalytic conversion filter element 317 has a ring structure, which increases the structural strength of the catalytic conversion filter element 317 on the one hand, and improves the oxidation-reduction reaction effect of the catalytic conversion filter element 317 on carbon soot particles on the other hand.

[0087] Of course, in other embodiments, the catalytic conversion filter element 317 may also be provided with multiple segments at intervals along the circumference of the central tube 33, and the cross-section of each segment of the catalytic conversion filter element 317 is arc-shaped.

[0088] Implementation Method Two: In this implementation method, refer to... Figure 5 The separator 3 includes an intake manifold 34, a first outlet manifold 35, a second outlet manifold 36, and a filter screen 37. Both the first and second outlet manifolds 35 and 36 are connected to the intake manifold 34. The filter screen 37 is located inside the intake manifold 34 and at the connection point between the first and second outlet manifolds 35 and 36. The second outlet manifold 36 is located to the side of the first outlet manifold 35. The filter screen 37 extends obliquely from the intake manifold 34 to the first outlet manifold 35 towards the direction of the second outlet manifold 36. The internal space of the intake manifold 34 constitutes... The separation chamber 321 is formed by the first exhaust pipe 35, which constitutes the first exhaust channel 331, and the second exhaust pipe 36, which constitutes the second exhaust channel 316. Both the first exhaust pipe 35 and the second exhaust pipe 36 are connected to the particulate trap 2. The filter screen 37 has filter holes of a set size so that carbon soot particles with a particle size smaller than the diameter of the filter holes can pass through the filter screen 37 and directly enter the first exhaust pipe 35, while carbon soot particles with a particle size larger than the diameter of the filter holes are blocked by the filter screen and enter the second exhaust pipe 36 under the tilting action of the filter screen, so as to achieve separation of carbon soot particles according to their different particle sizes.

[0089] In a preferred embodiment, the exhaust aftertreatment system further includes a muffler connected to the particulate filter 2, so that the exhaust gas treated by the particulate filter 2 directly enters the muffler and is finally discharged into the air through the muffler.

[0090] This application does not specify the exact value of the set value. Preferably, the set value is 100nm, so that more carbon soot particles can enter the second exhaust channel 316 and be oxidized and reduced by the catalytic conversion filter element 317, thereby further extending the time required for the carbon load of the particulate filter 2 to be saturated, and further reducing the frequency of regeneration of the particulate filter 2.

[0091] It should be noted that, in the first embodiment described above, the carbon soot particles exceeding a set value can enter the second exhaust channel 316 by adjusting the exhaust gas pressure entering the housing 31; in the second embodiment described above, the carbon soot particles exceeding a set value can enter the second exhaust channel 316 by providing a filter screen 37 with filter holes equal to a set value.

[0092] In other embodiments, the set value can be any value between 100nm and 1μm, or the set value can be any value range between 100nm and 1μm.

[0093] This application also discloses a vehicle including the exhaust aftertreatment system described above.

[0094] Because the vehicle in this application uses the aforementioned exhaust aftertreatment system, it avoids the direct entry of large-diameter carbon particulate matter into the particulate filter 2, thereby extending the time required for the particulate filter 2 to reach carbon saturation. This reduces the frequency of regeneration required by the particulate filter 2, thereby reducing the increase in fuel consumption and heat loss caused by frequent activation of the particulate filter 2 regeneration process. This achieves the effect of reducing vehicle fuel consumption and heat loss, while also reducing stress damage to the carrier material of the particulate filter 2 to ensure the service life of the particulate filter 2, and thus reducing the vehicle's failure rate.

[0095] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0096] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0097] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. An exhaust aftertreatment system, characterized in that, The device includes a catalytic converter (1), a particulate filter (2), and a separator (3) located between the catalytic converter (1) and the particulate filter (2). The separator (3) has a separation chamber (321) communicating with the catalytic converter (1) and a first exhaust passage (331) and a second exhaust passage (316) communicating with the separation chamber (321). The first exhaust passage (331) and the second exhaust passage (316) are both connected to the particulate filter (2). A catalytic converter filter element (317) is provided in the second exhaust passage (316). The separation chamber (321) can separate particulate matter according to the particle size, so that particulate matter with a particle size smaller than a set value enters the particulate filter (2) through the first exhaust passage (331), and particulate matter with a particle size larger than the set value enters the second exhaust passage (316) and is processed by the catalytic converter filter element (317) before entering the particulate filter (2).

2. The exhaust aftertreatment system according to claim 1, characterized in that, The separator (3) includes a circular cross-section housing (31), an air inlet pipe (32) disposed in the housing (31), and a central pipe (33) disposed inside the housing (31). The housing (31) has an air inlet end and an air outlet end opposite to the air inlet end. The air inlet pipe (32) is disposed at the air inlet end and is tangential to the inner circumferential surface of the housing (31). The central pipe (33) is located at the air outlet end. The first exhaust channel (331) is formed inside the central pipe (33). The second exhaust channel (316) is formed between the central pipe (33) and the inner wall of the housing (31).

3. The exhaust aftertreatment system according to claim 2, characterized in that, The housing (31) includes an intake section (311), a first guide section (312), and an exhaust section (313) arranged sequentially. The diameter of the intake section (311) is larger than the diameter of the exhaust section (313). The diameter of the first guide section (312) gradually decreases along the direction from the intake section (311) to the exhaust section (313). The separation chamber (321) is formed inside the intake section (311). The central tube (33) is located in the exhaust section (313). The catalytic converter filter element (317) is located inside the exhaust section (313).

4. The exhaust aftertreatment system according to claim 3, characterized in that, The housing (31) further includes a second guide section (314) located at the end of the exhaust section (313) away from the first guide section (312). The central tube (33) extends in a direction away from the first guide section (312). The diameter of the second guide section (314) gradually decreases in a direction away from the exhaust section (313). The end of the second guide section (314) away from the exhaust section (313) is connected to the central tube (33) so that an exhaust gas chamber (318) is formed between the central tube (33) and the second guide section (314). The central tube (33) is provided with a connecting hole (319) communicating with the exhaust gas chamber (318).

5. The exhaust aftertreatment system according to claim 4, characterized in that, Multiple connecting holes (319) are provided, and at least some of the connecting holes (319) are located at the end of the exhaust gas chamber (318) away from the catalytic conversion filter element (317).

6. The exhaust aftertreatment system according to claim 3, characterized in that, A first bushing (332) is provided between the central tube (33) and the catalytic converter filter element (317), and a second bushing (315) is provided between the catalytic converter filter element (317) and the exhaust section (313).

7. The exhaust aftertreatment system according to claim 3, characterized in that, The central tube (33) is provided with a guide cover (333) located in the first guide section (312), and the inner diameter of the guide cover (333) gradually increases in the direction away from the central tube (33).

8. An exhaust aftertreatment system according to any one of claims 2-7, characterized in that, The intake pipe (32) has an intake side connected to the catalytic converter (1) and an outlet side connected to the housing (31), wherein the axial dimension of the intake side in the housing (31) is smaller than the axial dimension of the outlet side in the housing (31).

9. An exhaust aftertreatment system according to any one of claims 2-7, characterized in that, The housing (31) has a central axis, which is set at an angle to the horizontal plane; And / or, the central tube (33) is coaxially arranged with the housing (31); And / or, the catalytic conversion filter element (317) is fitted over the outside of the central tube (33).

10. A vehicle, characterized in that, Includes the exhaust aftertreatment system as described in any one of claims 1-9 above.

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