Post-processing system and vehicle with same

Abstract

The invention provides an after-treatment system and a vehicle with the same, and relates to the technical field of tail gas treatment. The post-treatment system comprises a urea tank, the urea tank is connected with the frame, the urea tank is provided with a containing cavity, and urea liquid is stored in the containing cavity; one end of the preceding-stage urea nozzle communicates with the containing cavity through a urea pipeline, the preceding-stage urea nozzle is provided with a preceding-stage nozzle, and the preceding-stage nozzle is arranged in an exhaust pipeline of the engine; one end of the rear-stage urea nozzle is communicated with the containing cavity through a urea pipeline, the rear-stage urea nozzle is provided with a rear-stage nozzle, and the rear-stage nozzle is arranged in an exhaust pipeline of the postprocessor; wherein the front-stage urea nozzle and the rear-stage urea nozzle are connected in parallel through a urea pipeline, the front-stage urea nozzle and the containing cavity are connected through a gas path pipeline, and the urea spraying operation and the gas path reverse blowing operation of the front-stage urea nozzle and the rear-stage urea nozzle are independently controlled. The problems that an after-treatment system is complex in structure, low in conversion efficiency and high in cost are solved.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, and more specifically, to an aftertreatment system and a vehicle having the same. Background Technology

[0002] In existing technologies, a urea injection device is typically installed at the inlet of the exhaust gas aftertreatment system. The conversion efficiency is affected by adjusting the injection volume. This results in a complex system structure, low conversion efficiency, and high cost.

[0003] There is currently no effective solution to the aforementioned technical problems. Summary of the Invention

[0004] The main objective of this invention is to provide an after-treatment system and a vehicle having the same, in order to solve the problems of complex structure, low conversion efficiency, and high cost of existing after-treatment systems.

[0005] To achieve the above objectives, according to one aspect of the present invention, an aftertreatment system is provided, comprising: a urea tank connected to a vehicle frame, the urea tank having a receiving cavity containing urea solution; a front-stage urea nozzle, one end of which is connected to the receiving cavity via a urea pipeline, the front-stage urea nozzle having a front-stage nozzle disposed in an engine exhaust pipe; and a rear-stage urea nozzle, one end of which is connected to the receiving cavity via a urea pipeline, the rear-stage urea nozzle having a rear-stage nozzle disposed in the aftertreatment system exhaust pipe; wherein the front-stage urea nozzle and the rear-stage urea nozzle are connected in parallel via urea pipelines, the front-stage urea nozzle is connected to the receiving cavity via an air passage pipeline, and the urea injection operation and air passage backflushing operation of the front-stage urea nozzle and the rear-stage urea nozzle are independently controlled.

[0006] Furthermore, the after-treatment system also includes an air pressure unit, which is connected to the containment cavity via a pressurization pipeline. The air pressure unit is used at least to provide a pressurization air source.

[0007] Furthermore, the urea pipeline includes: a first urea pipeline, one end of which is connected to the receiving cavity, and the other end of which is connected to the downstream urea nozzle; a second urea pipeline, one end of which is connected to the first urea pipeline, and the other end of which is connected to the upstream urea nozzle; wherein the other end of the first urea pipeline is connected to the second urea pipeline via a three-way valve.

[0008] Furthermore, the post-treatment system also includes a heating component, which includes a resistance wire connected to the urea pipeline. At least a portion of the resistance wire is disposed on the pipe wall of the urea pipeline along the extension direction of the urea pipeline. The resistance wire is connected to an external power source and is used to electrically heat the urea pipeline and the urea solution in the urea pipeline.

[0009] Furthermore, one end of the gas pipeline is connected to the pressure-building pipeline through the receiving cavity, and the other end of the gas pipeline is connected to at least one of the second urea pipeline and the pre-stage urea nozzle. The gas pipeline is used to backflush the urea solution in the urea pipeline.

[0010] Furthermore, the aftertreatment system also includes a cooling assembly, which includes a first cooling pipe. The first cooling pipe includes: a first inlet pipe, one end of which is connected to the engine coolant, and the other end of which extends into the second urea pipe near the end of the pre-stage urea nozzle; and a first outlet pipe, one end of which is connected to the first inlet pipe, and the other end of which is connected to the engine coolant, and extends into the first urea pipe near the end of the post-stage urea nozzle. The first inlet pipe and the first outlet pipe are connected in series, and the first cooling pipe is used to cool the pre-stage urea nozzle and the post-stage urea nozzle.

[0011] Furthermore, the cooling assembly also includes a second cooling pipe, which includes: a second inlet pipe, one end of which is connected to the engine coolant and the other end of which extends into the receiving cavity; and a second outlet pipe, one end of which is connected to the engine coolant and the other end of which is connected to the second inlet pipe; wherein the second cooling pipe is used to cool the urea solution in the receiving cavity.

[0012] Furthermore, the aftertreatment system also includes a sensor assembly, which is located at least on the side of the pressure-building line near the urea tank, and is used to monitor the pressure of the compressed air in the containment chamber.

[0013] Furthermore, the frame includes at least a longitudinal beam extending along the length of the vehicle body, and at least a portion of the urea pipeline, at least a portion of the air pipeline, at least a portion of the first cooling pipeline, and at least a portion of the second cooling pipeline are arranged to extend along the extension direction of the longitudinal beam.

[0014] According to another aspect of the present invention, a vehicle is provided having an after-treatment system, the after-treatment system being the aforementioned after-treatment system.

[0015] By applying the technical solution of this invention, the aftertreatment system uses two urea nozzles, a pre-stage urea nozzle and a post-stage urea nozzle, connected in parallel on the urea pipeline. These nozzles inject urea into both the engine exhaust pipe and the aftertreatment system exhaust pipe, allowing for precise urea injection based on engine operating conditions. This improves NOx conversion efficiency, enhances emission reduction, and saves urea consumption. Simultaneously, an air passage is installed between the pre-stage urea nozzle and the receiving cavity. This air passage allows for backflushing of the pre-stage urea nozzle after urea injection, preventing urea from remaining in the urea pipeline, preventing urea crystallization and blockage, and ensuring the stability and reliability of the system. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of a first embodiment of the post-processing system according to the present invention is shown;

[0018] Figure 2 A schematic diagram of a second embodiment of the post-processing system according to the present invention is shown.

[0019] The above figures include the following reference numerals:

[0020] 1. Urea tank; 3. Pre-stage urea nozzle; 4. Post-stage urea nozzle; 5. Urea pipeline; 51. First urea pipeline; 52. Second urea pipeline; 6. Gas pipeline; 7. Pressure build-up pipeline; 8. Cooling assembly; 81. First cooling pipeline; 811. First liquid inlet pipeline; 812. First liquid outlet pipeline; 82. Second cooling pipeline; 821. Second liquid inlet pipeline; 822. Second liquid outlet pipeline. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0025] Combination Figures 1 to 2 As shown, according to a specific embodiment of this application, a post-processing system is provided.

[0026] Specifically, such as Figure 1 As shown, the aftertreatment system includes a urea tank 1, a front-stage urea nozzle 3, and a rear-stage urea nozzle 4. The urea tank 1 is connected to the vehicle frame and has a receiving cavity containing urea solution. One end of the front-stage urea nozzle 3 is connected to the receiving cavity via a urea pipeline 5. The front-stage urea nozzle 3 has a front-stage nozzle located in the engine exhaust pipe. One end of the rear-stage urea nozzle 4 is connected to the receiving cavity via a urea pipeline 5. The rear-stage urea nozzle 4 has a rear-stage nozzle located in the aftertreatment system exhaust pipe. The front-stage urea nozzle 3 and the rear-stage urea nozzle 4 are connected in parallel via the urea pipeline 5. The front-stage urea nozzle 3 is connected to the receiving cavity via an air passage pipeline 6. The urea injection and air backflushing operations of the front-stage urea nozzle 3 and the rear-stage urea nozzle 4 are controlled independently.

[0027] Applying the technical solution of this embodiment, the aftertreatment system uses two urea nozzles, a pre-stage urea nozzle 3 and a post-stage urea nozzle 4, connected in parallel on the urea pipeline 5. These nozzles inject urea into both the engine exhaust pipe and the aftertreatment system exhaust pipe, allowing for precise urea injection based on engine operating conditions. This improves NOx conversion efficiency, enhances emission reduction, and saves urea consumption. Simultaneously, an air passage 6 is installed between the pre-stage urea nozzle 3 and the receiving cavity. This air passage 6 allows for backflushing of the pre-stage urea nozzle 3 after the urea injection process, preventing urea from remaining in the urea pipeline 5, preventing urea crystallization and blockage, and ensuring the stability and reliability of the system.

[0028] In this embodiment, by independently controlling the urea injection and backflushing operations of the front-stage urea nozzle 3 and the rear-stage urea nozzle 4, the coordinated operation and autonomous maintenance of the two-stage injection system are achieved. For example, under different engine operating conditions, the front-stage urea nozzle 3 can inject urea solution in advance for preliminary reduction based on the exhaust temperature and NOx concentration, while the rear-stage urea nozzle 4 can perform precise supplementary injection based on the ammonia distribution and temperature conditions at the aftertreatment inlet, thereby improving the overall SCR conversion efficiency. After each injection, the front-stage urea nozzle 3 and the rear-stage urea nozzle 4 can initiate backflushing to remove residual urea solution and crystals from the nozzles using compressed air, avoiding injection failure or local crystal accumulation caused by nozzle blockage. This solves the problems of inaccurate injection timing and difficulty in removing crystal blockage caused by synchronous front-stage injection and backflushing linkage in the prior art, significantly improving the conversion efficiency and long-term operational reliability of the aftertreatment system.

[0029] Specifically, the aftertreatment system also includes an air pressure unit, which is connected to the receiving cavity via a pressure-building pipeline 7. The air pressure unit is used at least to provide a pressure-building air source. By introducing the air pressure unit and directly connecting it to the receiving cavity of the urea tank 1 via the pressure-building pipeline 7, a system-level pressure-building driving force is provided for the urea solution, improving the urea's response speed and supply stability in low-temperature environments, and creating a synergistic effect with subsequent closed-loop backflushing operations. This ensures that the upstream urea nozzle 3 and the downstream urea nozzle 4 have sufficient and consistent pneumatic power when performing airflow backflushing operations, effectively overcoming problems such as insufficient backflushing pressure, delayed backflushing triggering, or failure caused by unclear air sources.

[0030] Furthermore, the urea pipeline 5 includes a first urea pipeline 51 and a second urea pipeline 52. One end of the first urea pipeline 51 is connected to the receiving cavity, and the other end is connected to the downstream urea nozzle 4. One end of the second urea pipeline 52 is connected to the first urea pipeline 51, and the other end is connected to the upstream urea nozzle 3. The other end of the first urea pipeline 51 and the second urea pipeline 52 are connected via a three-way valve. This connection between the first urea pipeline 51 and the second urea pipeline 52 ensures a unidirectional supply path for urea solution from the urea tank 1 to the downstream urea nozzle 4 and then to the upstream urea nozzle 3, guaranteeing priority injection from the downstream stage and supplementary injection from the upstream stage. In addition, by switching via a three-way valve, compressed air can flow from the front-stage urea nozzle 3 to the second urea pipeline 52, then to the rear-stage urea nozzle 4 and the first urea pipeline 51, and finally back to the urea tank 1, forming a complete closed-loop purging path. The liquid supply and purging functions are achieved through only one three-way valve and urea pipeline 5, which greatly simplifies the control logic and pipeline layout, and reduces the overall cost and complexity.

[0031] Furthermore, the aftertreatment system also includes a heating assembly comprising a resistance wire connected to the urea pipeline 5. At least a portion of the resistance wire is disposed on the wall of the urea pipeline 5 along its extension direction. The resistance wire is connected to an external power source and is used to electrically heat the urea pipeline 5 and the urea solution within it. By directly attaching or embedding the resistance wire into the pipeline wall, heat conduction to the urea solution via the resistance wire can be achieved at zero distance, improving the heating efficiency of the urea and reducing cold start time. Moreover, direct electric heating using the resistance wire eliminates the need for an engine heat source, allows for independent control of operation, and provides instant heating upon power-up, making it suitable for engine cold starts, idling, and short-distance operating conditions.

[0032] Furthermore, one end of the air passage 6 is connected to the pressure-building passage 7 through the receiving cavity, and the other end of the air passage 6 is connected to at least one of the second urea passage 52 and the pre-stage urea nozzle 3. The air passage 6 is used to backflush the urea solution in the urea passage 5. The air passage 6 is directly connected to the second urea passage 52 or the pre-stage urea nozzle 3. Compressed air enters from the front inlet of the pre-stage urea nozzle 3, and reaches the urea tank 1 along the second urea passage 52 and the first urea passage 51 to achieve purging from the nozzle end to the tank. This avoids the urea solution from stagnating and crystallizing inside the passage or nozzle, significantly improving the backflush coverage and cleaning efficiency. It ensures that the backflush airflow can accurately act on areas prone to liquid accumulation, achieving targeted cleaning of key pipe sections, further reducing the risk of system blockage, and ensuring the long-term stable operation of the front and rear injection systems.

[0033] Furthermore, such as Figure 1 , Figure 2As shown, the aftertreatment system also includes a cooling assembly 8, which includes a first cooling pipe 81. The first cooling pipe 81 includes a first inlet pipe 811 and a first outlet pipe 812. One end of the first inlet pipe 811 is connected to the engine coolant, and the other end extends into the second urea pipe 52 near the end of the front-stage urea nozzle 3. One end of the first outlet pipe 812 is connected to the first inlet pipe 811, and the other end of the first outlet pipe 812 is connected to the engine coolant. The first outlet pipe 812 extends into the first urea pipe 51 near the end of the rear-stage urea nozzle 4. The first inlet pipe 811 and the first outlet pipe 812 are connected in series, and the first cooling pipe 81 is used to cool the front-stage urea nozzle 3 and the rear-stage urea nozzle 4. By connecting the first cooling pipe 81 to the urea nozzle, the first cooling pipe 81 allows the coolant to flow directly through the urea nozzle, achieving zero-distance contact cooling. Furthermore, the first inlet pipe 811 is used to cool the pre-stage urea nozzle 3, and the first outlet pipe 812 is used to cool the post-stage urea nozzle 4, enabling precise temperature control at two points. Simultaneously, the first cooling pipe 81 is axially aligned with the urea pipe 5, improving the heat exchange rate. Through the cooperation of the first cooling pipe 81 and the resistance heating component, an intelligent thermal balance system is formed, which can control the temperature of the urea solution within the desired range, effectively suppressing material creep and seal aging caused by localized overheating of the nozzle body. It also reduces the risk of urea solution crystallizing due to high-temperature decomposition within the nozzle cavity, improving the long-term reliability and conversion efficiency of the system.

[0034] Furthermore, the cooling assembly 8 also includes a second cooling pipe 82, which includes a second inlet pipe 821 and a second outlet pipe 822. One end of the second inlet pipe 821 is connected to the engine coolant, and the other end extends into the receiving cavity. One end of the second outlet pipe 822 is connected to the engine coolant, and the other end is connected to the second inlet pipe 821. The second cooling pipe 82 is used to cool the urea solution in the receiving cavity. By using the engine coolant as a heat exchange medium, the temperature of the urea solution in the receiving cavity is directly controlled, effectively suppressing the risk of abnormal viscosity increase or local crystallization of the urea solution in low-temperature environments. This ensures that when the air pressure unit applies air pressure to the receiving cavity through the pressure-building pipe 7, the urea solution can maintain good fluidity and be stably pushed to the urea pipe 5. This ensures that the front-stage urea nozzle 3 and the rear-stage urea nozzle 4 can still achieve rapid response and continuous liquid supply under cold start or low-temperature conditions, improving the overall reliability and stability of the aftertreatment system.

[0035] Furthermore, the aftertreatment system also includes a sensor assembly, which is at least located on the side of the pressure-building pipeline 7 near the urea tank 1. The sensor assembly is used to monitor the pressure of the compressed air in the containment chamber. By setting up the sensor assembly, the compressed air pressure in the urea tank can be sensed in real time and accurately. Based on the actual air pressure, it can dynamically determine whether the pressure building is complete, whether the purging is thorough, and whether there is a leak in the air path. This allows for precise control of the start-up, shutdown, and operating time of the air pressure unit, which not only significantly improves purging efficiency and system reliability, but also eliminates injection failure caused by insufficient air pressure or energy waste caused by over-purging, solves the problem of urea crystallization blockage, and ensures that the system maintains stable operation under complex working conditions.

[0036] Furthermore, the frame includes at least longitudinal beams extending along the length of the vehicle body. At least a portion of the urea pipe 5, at least a portion of the air pipe 6, at least a portion of the first cooling pipe 81, and at least a portion of the second cooling pipe 82 are arranged along the extension direction of the longitudinal beams. By coordinating the arrangement of the urea pipe 5, the air pipe 6, and the two cooling pipes along the length of the frame longitudinal beams, a highly integrated, compact, safe, and reliable vehicle layout is constructed. Using the longitudinal beams as the physical framework, spatial reuse and structural integration of the powertrain aftertreatment piping system are achieved, shortening the total length of the piping, reducing the number of joints, reducing leakage risk and pressure drop loss, and greatly improving the durability and wear resistance of the piping under vehicle vibration and impact environments. At the same time, the arrangement along the longitudinal beams allows all pipes to share the same mounting support system, significantly simplifying the fixing structure, reducing assembly complexity and cost, and creating favorable space conditions for subsequent thermal management (such as the thermal coupling between the coolant circuit and the exhaust heat source).

[0037] According to another specific embodiment of this application, a vehicle is also provided with an aftertreatment system, which is the aftertreatment system described in the above embodiments. Applying the aftertreatment system described in the above embodiments to a vehicle enables coordinated injection from front and rear nozzles under different operating conditions, improving NOx conversion efficiency and reducing urea consumption. Simultaneously, residual urea is drawn back to the urea tank via air backflushing, effectively reducing the risk of crystallization in the nozzles and pipelines. Combined with electrically heated urea pipes and a coolant circulation loop, it ensures rapid system start-up and continuous stable operation in low-temperature environments, improving the reliability and durability of the entire vehicle's aftertreatment system.

[0038] This application also provides a preferred embodiment of an aftertreatment system. Specifically, the aftertreatment system employs two urea nozzles arranged in parallel, located at the pre-stage and post-stage processors of the engine exhaust pipe, respectively. The entire urea system consists of a urea tank 1, an air pressure unit (APU), a supply module, and two parallel urea nozzles at the pre- and post-stages. It can achieve coordinated injection according to operating conditions, which not only improves the conversion function but also realizes precise control of on-demand injection, thereby improving efficiency while saving urea consumption.

[0039] like Figure 2 As shown, the urea pipeline 5 and water pipe between the front-stage urea nozzle 3 and the rear-stage urea nozzle 4 are connected in series. The engine provides coolant to cool the two nozzles and then returns to form the cooling circuit of the first cooling pipeline 81. The APU provides a pressurized air source to the urea tank 1, and the urea tank 1 is connected to the front-stage urea nozzle 3 through the backflush pipe in the air pipeline 6. After the injection is completed, the control system opens the air path to purge the two-stage nozzles connected in series, blowing the residual urea back into the urea tank 1. This reduces the risk of blockage of the urea nozzles and urea pipeline 5 due to urea crystallization and ice expansion, and improves the reliability of the system.

[0040] The urea pipeline 5 from the urea tank 1 to the downstream urea nozzle 4, and from the downstream urea nozzle 4 to the upstream urea nozzle 3, are all electrically heated urea pipelines containing resistance wires. They use a three-way integrated assembly to simultaneously power and control the electric heating function of these two pipelines with a single connecting wire.

[0041] As can be seen from the above description, the post-processing system in the above embodiments has the following beneficial effects:

[0042] By adopting a two-stage parallel urea nozzle design, the NOx conversion efficiency is significantly improved, enabling precise injection based on engine operating conditions. This enhances emission reduction while saving urea consumption. Simultaneously, the cooling circulation and electric heating piping system effectively prevents urea crystallization and blockage, ensuring system stability and reliability. It also simplifies wiring layout, reduces overall cost and complexity, and ensures normal operation and rapid start-up in low-temperature environments.

[0043] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0044] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0045] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A post-processing system, characterized in that, include: A urea tank (1) is connected to the vehicle frame. The urea tank (1) has a receiving cavity in which urea solution is stored. A front-stage urea nozzle (3) is provided, one end of which is connected to the receiving cavity via a urea pipeline (5). The front-stage urea nozzle (3) has a front-stage nozzle, which is located in the engine exhaust pipe. The rear urea nozzle (4) has one end connected to the receiving cavity through the urea pipeline (5), and the rear urea nozzle (4) has a rear nozzle, which is located in the exhaust pipe of the post-processor. The pre-stage urea nozzle (3) and the post-stage urea nozzle (4) are connected in parallel through the urea pipeline (5), and the pre-stage urea nozzle (3) is connected to the receiving cavity through the air pipeline (6). The urea injection operation and air backflushing operation of the pre-stage urea nozzle (3) and the post-stage urea nozzle (4) are controlled independently.

2. The post-processing system according to claim 1, characterized in that, The post-processing system also includes an air pressure unit, which is connected to the containment cavity via a pressure-building pipeline (7). The air pressure unit is used to provide at least a pressure-building air source.

3. The post-processing system according to claim 2, characterized in that, The urea pipeline (5) includes: The first urea pipeline (51) has one end connected to the receiving cavity and the other end connected to the downstream urea nozzle (4). The second urea pipeline (52) has one end connected to the first urea pipeline (51) and the other end connected to the front urea nozzle (3). The other end of the first urea pipeline (51) is connected to the second urea pipeline (52) via a three-way valve.

4. The post-processing system according to claim 3, characterized in that, The post-processing system further includes a heating component, which includes a resistance wire connected to the urea pipeline (5). At least a portion of the resistance wire is disposed on the pipe wall of the urea pipeline (5) along the extension direction of the urea pipeline (5). The resistance wire is connected to an external power source and is used to electrically heat the urea pipeline (5) and the urea solution in the urea pipeline (5).

5. The post-processing system according to claim 4, characterized in that, One end of the gas pipeline (6) is connected to the pressure-building pipeline (7) through the receiving cavity, and the other end of the gas pipeline (6) is connected to at least one of the second urea pipeline (52) and the pre-stage urea nozzle (3). The gas pipeline (6) is used to backflush the urea liquid in the urea pipeline (5).

6. The post-processing system according to any one of claims 3-5, characterized in that, The post-processing system further includes a cooling assembly (8), which includes a first cooling pipe (81) comprising: The first liquid inlet pipe (811) has one end connected to the engine coolant and the other end extended into the second urea pipe (52) near the end of the front-stage urea nozzle (3). The first liquid outlet pipe (812) has one end connected to the first liquid inlet pipe (811) and the other end connected to the engine coolant. The first liquid outlet pipe (812) extends into the first urea pipe (51) near the end of the rear urea nozzle (4). The first liquid inlet pipe (811) is connected in series with the first liquid outlet pipe (812), and the first cooling pipe (81) is used to cool the front urea nozzle (3) and the rear urea nozzle (4).

7. The post-processing system according to claim 6, characterized in that, The cooling assembly (8) further includes a second cooling pipe (82), the second cooling pipe (82) comprising: The second liquid inlet pipe (821) has one end connected to the engine coolant and the other end extending into the receiving cavity; The second liquid outlet pipe (822) has one end connected to the engine coolant and the other end connected to the second liquid inlet pipe (821). The second cooling pipe (82) is used to cool the urea solution in the receiving cavity.

8. The post-processing system according to claim 2, characterized in that, The post-processing system also includes a sensor assembly, which is at least located on the side of the pressure-building pipeline (7) near the urea tank (1), and is used to monitor the pressure of compressed air in the containment chamber.

9. The post-processing system according to claim 7, characterized in that, The frame includes at least a longitudinal beam that extends along the length of the vehicle body, and at least a portion of the urea pipe (5), at least a portion of the air pipe (6), at least a portion of the first cooling pipe (81), and at least a portion of the second cooling pipe (82) are arranged to extend along the extension direction of the longitudinal beam.

10. A vehicle, characterized in that, The vehicle has an after-treatment system, which is the after-treatment system according to any one of claims 1-9.

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