Egr mixing device, engine and motor vehicle

Abstract

This disclosure provides an EGR mixing device, engine, and motor vehicle, relating to the field of exhaust gas recirculation technology. The device includes an intake manifold, a first EGR exhaust pipe, and a second EGR exhaust pipe. An EGR mixing chamber is disposed inside the intake manifold. The first EGR exhaust pipe is connected to one side of the EGR mixing chamber. The second EGR exhaust pipe is connected to the other side of the EGR mixing chamber. A mixing shuttle is disposed inside the EGR mixing chamber. The mixing shuttle has a hollow, three-dimensional shuttle-shaped structure. In the direction of fresh gas intake, the shell surface of the mixing shuttle is sequentially provided with an intake zone through-hole, an EGR zone through-hole, and an exhaust zone through-hole. EGR exhaust gas entering through the EGR zone through-hole and fresh gas entering through the intake zone through-hole form a mixed gas inside the mixing shuttle and are discharged along the exhaust zone through-hole. This device ensures zero contact between the EGR exhaust gas and the wall surface of the intake manifold, reducing the risk of wall icing.

Description

Technical Field

[0001] This disclosure belongs to the field of exhaust gas recirculation technology, specifically relating to an EGR mixing device, an engine, and a motor vehicle. Background Technology

[0002] With increasingly stringent emission regulations, the adoption of exhaust gas recirculation (EGR) in engines has become an important means of reducing nitrogen oxide (NOx) emissions. Under normal operating conditions, the temperature range of EGR exhaust gas is 70°C to 180°C. However, in low-temperature environments, due to the high water vapor content in EGR exhaust gas, this water vapor easily freezes on the inner wall of the intake manifold, reducing the intake flow area and affecting engine performance.

[0003] In related technologies, EGR mixing devices mainly employ either a natural mixing structure or a perforated mixing structure. For the natural mixing structure, small-displacement engines struggle to achieve a long mixing section, limiting the mixing effect of the EGR mixing device. Furthermore, in winter or cold regions, the high-temperature EGR exhaust gas collides with the low-temperature intake manifold, causing water in the EGR exhaust gas to precipitate and ic. For the perforated mixing structure, the EGR exhaust gas directly impacts the wall of the intake manifold; when the engine is in a cold environment, icing can also occur due to the low wall temperature of the intake manifold.

[0004] In summary, the intake pipe of the EGR mixing unit of the relevant technology is prone to icing in low-temperature environments. Utility Model Content

[0005] This disclosure provides an EGR mixing device, an engine, and a motor vehicle, which aims to at least partially solve the technical problem that the intake manifold is prone to icing in low-temperature environments.

[0006] At least one embodiment of this disclosure provides an EGR mixing apparatus, comprising:

[0007] An intake pipe is provided with a fresh gas inlet at one end and a mixed gas outlet at the other end, and an EGR mixing chamber is provided inside the intake pipe.

[0008] A first EGR exhaust pipe, wherein the first EGR exhaust pipe is connected to one side of the EGR mixing chamber; and,

[0009] The second EGR exhaust pipe is connected to the other side of the EGR mixing chamber;

[0010] The EGR mixing chamber is equipped with a mixing shuttle, which is located between the outlet end of the first EGR exhaust pipe and the outlet end of the second EGR exhaust pipe. The mixing shuttle is a hollow three-dimensional shuttle structure. In the direction of fresh gas intake, the shell surface of the mixing shuttle is sequentially provided with an intake zone through hole facing the fresh gas inlet, an EGR zone through hole facing the first EGR exhaust pipe and the second EGR exhaust pipe, and an outlet zone through hole facing the mixed gas outlet.

[0011] In at least one embodiment of the EGR mixing apparatus provided in this disclosure, the diameter of the EGR mixing chamber is larger than the diameter of the fresh gas inlet.

[0012] In at least one embodiment of the EGR mixing device provided in this disclosure, the mixing shuttle includes an air inlet structure facing the fresh gas inlet, an air outlet structure facing the mixed gas outlet, and an EGR zone structure facing the first EGR exhaust pipe and the second EGR exhaust pipe.

[0013] The surface of the air intake area structure is provided with a plurality of air intake through holes, the surface of the air outlet area structure is provided with a plurality of air outlet through holes, the surface of the EGR area structure is provided with a plurality of EGR through holes, and the pipe diameter of the EGR area structure is larger than the pipe diameter of the air intake area structure and the pipe diameter of the air outlet area structure.

[0014] In the EGR mixing device provided in at least one embodiment of this disclosure, in the direction of fresh gas intake, the pipe diameter at different positions of the mixing shuttle first increases and then decreases, and both the intake zone structure and the outlet zone structure are pointed structures.

[0015] In at least one embodiment of the EGR mixing apparatus provided in this disclosure, the interior of the EGR mixing chamber is further provided with:

[0016] A mixing shuttle support is fixed to the inner wall of the EGR mixing chamber, and the mixing shuttle support is provided with a mounting mechanism for the mixing shuttle, through which the mixing shuttle is installed in the middle position of the EGR mixing chamber.

[0017] In at least one embodiment of the EGR mixing device provided in this disclosure, the diameters of the EGR zone through-hole, the inlet zone through-hole, and the outlet zone through-hole are the same. Furthermore, the opening direction of the EGR zone through-hole is the same as the outlet direction of the EGR exhaust gas in the first EGR exhaust pipe and the second EGR exhaust pipe, the opening direction of the inlet zone through-hole is the same as the inlet direction of the fresh gas, and the opening direction of the outlet zone through-hole is the same as the outlet direction of the mixed gas.

[0018] In the EGR mixing device provided in at least one embodiment of this disclosure, both the first EGR exhaust pipe and the second EGR exhaust pipe are hollow circular pipes, and both the outlet end of the first EGR exhaust pipe and the outlet end of the second EGR exhaust pipe are flared structures.

[0019] The EGR mixing apparatus provided in at least one embodiment of this disclosure further includes:

[0020] An EGR flow valve is provided in either the first EGR exhaust pipe or the second EGR exhaust pipe.

[0021] At least one embodiment of this disclosure also provides an engine that includes the EGR mixing device as provided in any embodiment of this disclosure.

[0022] At least one embodiment of this disclosure also provides a motor vehicle, the motor vehicle including the EGR mixing device as provided in any embodiment of this disclosure.

[0023] Compared with related technologies, the EGR mixing device, engine, and motor vehicle provided by the embodiments of this disclosure have an EGR mixing chamber set in the intake manifold and a mixing shuttle set in the EGR mixing chamber. During operation, the EGR exhaust gas and fresh gas are mixed in the mixing shuttle and discharged through the air outlet. This ensures that the EGR exhaust gas has zero contact with the wall of the intake manifold, reducing the risk of wall icing. As a result, the engine with the EGR route can operate stably during low-temperature start-up, solving the technical problem of the intake manifold being prone to icing in low-temperature environments in related technologies.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of an EGR mixing device provided for at least one embodiment of this disclosure;

[0027] Figure 2 A schematic diagram of the external shape of an EGR mixing device provided for at least one embodiment of this disclosure;

[0028] Figure 3 A schematic diagram of another EGR mixing device provided for at least one embodiment of this disclosure;

[0029] Figure 4 A schematic diagram of another EGR mixing device provided for at least one embodiment of the present disclosure;

[0030] Figure 5 A schematic diagram of the gas flow direction of another EGR mixing device provided for at least one embodiment of the present disclosure;

[0031] Figure 6 This is a schematic diagram of the structure of a hybrid shuttle provided in at least one embodiment of the present disclosure;

[0032] Figure 7 A schematic diagram of the external shape of an EGR exhaust pipe provided for at least one embodiment of this disclosure;

[0033] Figure 8 A cross-sectional schematic diagram of an EGR exhaust pipe provided in at least one embodiment of this disclosure;

[0034] Figure 9 A schematic diagram of the structure of an example of an EGR mixing device provided in at least one embodiment of this disclosure;

[0035] Figure 10 A partial structural schematic diagram of an example of an EGR mixing device provided for at least one embodiment of this disclosure;

[0036] Figure 11 A structural block diagram of an engine provided for at least one embodiment of this disclosure;

[0037] Figure 12 This is a structural block diagram of a motor vehicle provided for at least one embodiment of the present disclosure.

[0038] Figure Labels

[0039] 1-Inlet pipe; 2-First EGR exhaust pipe; 3-Second EGR exhaust pipe; 4-EGR flow valve; 11-Fresh gas inlet; 12-Mixed gas outlet; 13-EGR mixing chamber; 41-EGR flow valve plate; 131-Mixing shuttle body;

[0040] 132 - Hybrid shuttle support; 131a - Inlet zone through-hole; 131b - EGR zone through-hole; 131c - Outlet zone through-hole; zone a -Intake zone structure; zone b - Air outlet area structure; zone c -EGR zone structure; 100-engine; 101-EGR mixing unit; 200-motor vehicle. Detailed Implementation

[0041] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the disclosure. Similarly, the following embodiments are only some, not all, embodiments of the present disclosure, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0042] The terms "first," "second," and "third" used in the embodiments of this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," and "third" may explicitly or implicitly include at least one of that feature.

[0043] In the description of this disclosure, "multiple" means at least two, such as two or three, unless otherwise expressly and specifically limited.

[0044] In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. 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 may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] The terms “comprising” and “having”, and any variations thereof, used in this disclosure are intended to cover non-exclusive inclusion. For example, a process, EGR mixing apparatus, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to such processes, EGR mixing apparatus, products, or devices.

[0046] In this disclosure, the term "engine controller" (ECU) refers to an electronic controller with computation and control functions applied to an engine. When the engine is running, it collects signals from various sensors, performs calculations, and converts the results of the calculations into control signals to control the operation of the controlled object.

[0047] The term "exhaust gas recirculation" (EGR) used in this disclosure refers to a technology that returns a portion of the engine's EGR exhaust gas to the engine cylinders to mix with fresh gas entering the engine, thereby improving engine efficiency, improving the combustion environment, reducing engine load, reducing NOx emissions, reducing knocking, and extending the service life of various components.

[0048] In the embodiments of this disclosure, the term "EGR mixing device" refers to a structure that can uniformly mix the fresh gas entering the engine with the EGR exhaust gas, ensuring the uniformity of EGR exhaust gas introduction into each cylinder under various operating conditions.

[0049] In this disclosure, the term "intake pipe" refers to a portion of an engine intake manifold located between the intercooler and the engine intake manifold, with the purpose of mixing fresh air with EGR exhaust gas through an EGR mixing device.

[0050] The related technology is prone to icing in low-temperature environments, which reduces the air intake flow area of ​​the engine and thus affects engine performance.

[0051] Figure 1 This is a schematic diagram of the structure of an EGR mixing device provided for at least one embodiment of the present disclosure. Figure 1 As shown, the EGR mixing device may include an intake pipe 1, a first EGR exhaust pipe 2, and a second EGR exhaust pipe 3.

[0052] One end of the intake pipe 1 is provided with a fresh gas inlet 11, the other end of the intake pipe 1 is provided with a mixed gas outlet 12, and the interior of the intake pipe 1 is provided with an EGR mixing chamber 13.

[0053] The first EGR exhaust pipe 2 (also known as the first EGR outlet pipe) is connected to one side of the EGR mixing chamber 13.

[0054] The second EGR exhaust pipe 3 (also known as the second EGR outlet pipe) is connected to the other side of the EGR mixing chamber 13.

[0055] The EGR mixing chamber 13 is equipped with a mixing shuttle 131 (hereinafter referred to as the shuttle). The mixing shuttle 131 is located between the outlet end of the first EGR exhaust pipe 2 and the outlet end of the second EGR exhaust pipe 3. The mixing shuttle 131 is a hollow three-dimensional shuttle structure. In the direction of fresh gas intake, the surface of the mixing shuttle 131 is provided with an intake zone through hole 131a facing the fresh gas inlet 11, an EGR zone through hole 131b facing the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3, and an outlet zone through hole 131c facing the mixed gas outlet 12.

[0056] It should be noted that the position of the mixing shuttle 131 corresponds to the outlet end of the first EGR exhaust pipe 2 and the outlet end of the second EGR exhaust pipe 3, so as to isolate the EGR exhaust gas on both sides of the mixing shuttle 131. Regarding the orientation of the intake pipe 1, the embodiments of this disclosure are not limited, and can be set according to actual needs.

[0057] In the above scheme, the external structure of the EGR mixing unit is shown below. Figure 2 Each intake pipe 1 requires two EGR exhaust pipes, namely the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3. The gas flow direction of the EGR mixing unit is shown in [reference needed]. Figure 3 Fresh gas (such as air or fuel gas) flows in through the fresh gas inlet 11 and mixes with the EGR exhaust gas (hereinafter referred to as exhaust gas) from the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 in the mixing shuttle 131. The mixture then flows out of the intake pipe 1 as a gas mixture and enters the engine to participate in combustion. This design not only optimizes the utilization efficiency of exhaust gas but also effectively reduces the exhaust gas emission temperature, thereby reducing potential damage to the engine and other components of the vehicle.

[0058] For the mixing shuttle 131, the EGR exhaust gas entering through the EGR zone through-hole 131b and the fresh gas entering through the intake zone through-hole 131a form a mixed gas inside the mixing shuttle 131 and are discharged along the exhaust zone through-hole 131c.

[0059] The surface of the mixing shuttle 131 is perforated to achieve the mixing function and reduce intake resistance. After the EGR exhaust gas flows in from both sides of the EGR mixing chamber 13, it can flow into the interior of the mixing shuttle 131 through the EGR zone through-hole 131b. Fresh gas can also flow into the interior of the mixing shuttle 131, achieving mixing. At the same time, the drilling technology can significantly reduce the intake resistance caused by the EGR exhaust gas flowing backward along the surface of the mixing shuttle 131 to the fresh gas inlet 11, allowing the EGR exhaust gas to be smoothly introduced into the interior of the mixing shuttle 131.

[0060] During implementation, the EGR exhaust gas output from the engine can be effectively recirculated through the EGR mixing device. After the EGR exhaust gas and fresh gas are mixed in the EGR mixing chamber 13, they re-enter the engine cylinder to participate in combustion. In this process, the EGR mixing device not only ensures that the EGR exhaust gas and fresh gas are fully mixed, but also, because the EGR exhaust gas is introduced from both sides of the EGR mixing chamber 13, and a mixing shuttle 131 is installed in the pipeline of the EGR mixing chamber 13, the EGR exhaust gas and fresh gas mix in the mixing shuttle 131. Under the impact of the fresh gas, the EGR exhaust gas has zero contact with the wall surface of the intake manifold 1, avoiding the risk of water precipitation and icing of the intake manifold 1 after the high temperature EGR exhaust gas comes into contact with the wall surface of the intake manifold 1 due to the low temperature of the intake manifold 1 wall surface in low-temperature environments.

[0061] Some embodiments of this disclosure also provide engines and motor vehicles corresponding to the above-described EGR hybrid system.

[0062] The EGR mixing device provided in at least one embodiment of this disclosure is applicable to any existing engine application scenario with an EGR mixing device, and the embodiments of this disclosure are not limited thereto. For example, the EGR mixing device can be applied to diesel engines, gasoline engines, or hybrid engines, effectively improving the engine's fuel economy and emission performance by precisely controlling the EGR flow. Furthermore, due to its compact structure and high mixing efficiency, this device is also suitable for various types of motor vehicles, including but not limited to cars, trucks, buses, and construction machinery, providing a more environmentally friendly and efficient solution for vehicle power systems.

[0063] Compared with related technologies, the EGR mixing device proposed in this disclosure improves the structure of its intake pipe 1 by setting an EGR mixing chamber 13 inside the intake pipe 1 and a mixing shuttle 131 inside the EGR mixing chamber 13. This allows the EGR exhaust gas and fresh gas to mix in the mixing shuttle 131 during operation and then be discharged through the air outlet through hole 131c. This ensures zero contact between the EGR exhaust gas and the wall of the intake pipe 1, reducing the risk of wall icing. Consequently, the EGR-based engine can operate stably during low-temperature startup, solving the technical problem of the intake pipe 1 being prone to icing in low-temperature environments in related technologies.

[0064] The main function of the intake pipe 1 is to introduce fresh air into the EGR mixing chamber 13 to mix with the EGR exhaust gas flowing in through the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3, and then supply the mixed gas to the engine cylinders. The mixing shuttle 131 has a hollow internal structure and a three-dimensional shuttle shape. The outer surface of the mixing shuttle 131 has through holes with different functions in different directions. These through holes include an intake zone through hole 131a, an EGR zone through hole 131b, and an exhaust zone through hole 131c. The intake zone through hole 131a is used to introduce fresh gas, the EGR zone through hole 131b is used to introduce EGR exhaust gas, and the exhaust zone through hole 131c is used to discharge the mixed gas.

[0065] The primary function of the first EGR exhaust pipe 2 is to introduce a portion of the EGR exhaust gas from the engine into the EGR mixing chamber 13. The first EGR exhaust pipe 2 is designed with specific dimensions and shapes to ensure that the EGR exhaust gas can flow smoothly and stably, while achieving efficient mixing with the fresh air introduced by the intake pipe 1 within the mixing shuttle 131.

[0066] The main function of the second EGR exhaust pipe 3 is to introduce another portion of the EGR exhaust gas discharged from the engine into the EGR mixing chamber 13. Similar to the first EGR exhaust pipe 2, the second EGR exhaust pipe 3 is also designed with specific dimensions and shapes to optimize the flow characteristics of the EGR exhaust gas, ensuring that the EGR exhaust gas can smoothly and efficiently enter the mixing shuttle 131 and be further mixed with fresh air in the mixing chamber.

[0067] In some embodiments, to further improve mixing efficiency, the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 are symmetrically arranged. This design allows for a more uniform introduction of EGR exhaust gas, which is beneficial for forming a more uniform gas mixture within the EGR mixing chamber 13. This not only improves the mixing efficiency of EGR exhaust gas and fresh air but also enhances the stability and reliability of the system. Furthermore, the symmetrical EGR exhaust pipe layout helps reduce airflow resistance and improve overall gas flow efficiency, thereby optimizing engine performance and fuel economy.

[0068] In some embodiments, to avoid increased gas resistance during EGR exhaust gas emission, the diameter of the EGR mixing chamber 13 is larger than the diameter of the fresh gas inlet 11 (the diameter of the intake pipe at the fresh gas inlet). This design is an important design feature of this disclosure. With this design, the EGR mixing chamber 13 has an increased diameter cavity structure. After the EGR exhaust gas flows into the intake pipe 1, the total gas flow rate inside the intake pipe 1 is equal to the sum of the EGR exhaust gas and the fresh gas. By adopting a cavity structure with an increased diameter, the increase in pipeline pressure due to increased gas flow can be effectively prevented, thereby avoiding the problem of increased resistance during EGR exhaust gas emission, reducing the pipeline pressure of the EGR mixing device, and lowering the intake resistance and pipeline resistance of the EGR mixing device. Furthermore, since the surface of the mixing shuttle 131 is designed with EGR zone through holes 131b, the EGR exhaust gas flowing into the mixing shuttle 131 will not flow in the opposite direction to the intake along the surface of the mixing shuttle 131, thus reducing the intake resistance.

[0069] Figure 4 A schematic diagram of another EGR mixing device provided for at least one embodiment of this disclosure. (See diagram below.) Figure 4 As shown, in Figure 1 In addition to the above, a mixing shuttle support 132 is also provided inside the EGR mixing chamber 13. The mixing shuttle support 132 is fixed to the inner wall of the EGR mixing chamber 13, and is used to install the mixing shuttle 131 in the middle position of the EGR mixing chamber 13. The mixing shuttle support 132 has structural stability and can resist the dynamic pressure generated during the flow of mixed gas, effectively avoiding displacement or vibration of the mixing shuttle 131.

[0070] Figure 5 This is a schematic diagram of the structure of yet another EGR mixing device provided in at least one embodiment of the present disclosure. (See diagram below.) Figure 5 As shown, in Figure 1 In addition to the above, to optimize engine performance, the EGR mixing device also includes an EGR flow valve 4. The EGR flow valve 4 is located in the first EGR exhaust pipe 2 and is used to control the flow of EGR exhaust gas through the first EGR exhaust pipe 2.

[0071] It should be noted that the EGR flow valve 4 can also be installed in the second EGR exhaust pipe 3. Furthermore, the EGR flow valve 4 can be adjusted manually or automatically, and the embodiments disclosed herein do not impose any limitations on this.

[0072] By adding an EGR flow valve 4 to one of the EGR exhaust pipes, such as the first EGR exhaust pipe 2, the EGR pressure loss caused by the engine diverting the EGR exhaust gas to the two EGR exhaust pipes in non-cold regions (also known as non-low temperature environments) can be avoided, thereby improving the engine's performance and emission stability in non-cold regions.

[0073] As an exemplary implementation, the EGR flow valve 4 can be configured such that: during a cold start of the EGR mixing unit, the EGR flow valve 4 is set to a fully open state, allowing EGR exhaust gas to simultaneously pass through the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 to warm up the EGR mixing unit; and after the EGR mixing unit starts, the set opening degree of the EGR flow valve 4 is related to the temperature deviation between the temperature of the fresh gas and the temperature of the mixed gas. This structural design is another important design point of this disclosure. Through this EGR flow adjustment strategy (the configuration of the EGR flow valve 4), the engine performance under various operating conditions can be guaranteed.

[0074] Figure 6 This is a schematic diagram of the structure of a hybrid shuttle provided in at least one embodiment of the present disclosure. Figure 6 As shown, in Figure 1 Based on this, in order to achieve a good gas mixing effect, the pipe diameter at different positions of the mixing shuttle 131 is first increased and then decreased in the direction of fresh gas inlet. This structural design is another important design feature of this disclosure.

[0075] In this process, the fresh gas decreases in speed as the pipe diameter increases inside the mixing shuttle 131. This allows for better mixing with the EGR exhaust gas entering through the EGR zone through-hole 131b. Part of the EGR exhaust gas mixes with the fresh gas within the mixing shuttle 131, improving mixing uniformity. Furthermore, this change in pipe diameter helps reduce eddies and turbulence, thereby reducing energy loss and improving the overall efficiency of the EGR mixing device. In the section where the pipe diameter decreases, the gas is compressed, further enhancing the mixing between the EGR exhaust gas and fresh gas. This ensures that the EGR exhaust gas is evenly distributed among the fresh gas, optimizing the mixing effect and ensuring the stability and reliability of the EGR mixing device under various operating conditions, thus improving engine combustion efficiency and emission performance.

[0076] like Figure 6 As shown, the mixing shuttle 131 includes an intake zone structure facing the fresh gas inlet 11. a (Also known as the front end or windward side), the air outlet structure facing the mixed gas outlet 12. b (Also known as the rear end or leeward side) and the EGR zone structure facing the first and second EGR exhaust pipes. c Intake zone structure a The surface is provided with multiple air inlet through holes 131a, and the air outlet structure is zone b The surface is provided with multiple air outlet through holes 131c, and the EGR zone structure is zone cThe surface is provided with multiple EGR zone through-holes. EGR zone structure c The pipe diameter is larger than the intake zone structure. a Pipe diameter and air outlet zone structure b The pipe diameter. The intake zone structure... a The air outlet zone structure is responsible for guiding fresh gas smoothly into the mixing shuttle 131. b The EGR zone is responsible for efficiently extracting the homogeneous gas mixture from the mixing shuttle. Its moderately reduced pipe diameter aids in gas compression and acceleration, allowing the mixture to enter the engine's combustion chamber more forcefully. c The pipe diameter is larger than the intake zone structure. a Diameter and air outlet zone structure b The appropriate pipe diameter provides ample mixing space for EGR exhaust gas and fresh gas, allowing them to blend thoroughly and achieve optimal mixing results. This design not only improves the uniformity of the gas mixture but also effectively reduces energy loss, ensuring efficient operation of engines equipped with EGR mixing systems.

[0077] like Figure 6 As shown, the air intake zone structure a and air outlet zone structure b All components feature a pointed structure, designed to promote more efficient gas flow along the shuttle surface and ensure smooth exhaust of the mixed gas from the EGR mixing chamber 13. This pointed structure not only reduces resistance during gas flow but also effectively prevents gas stagnation on the shuttle surface, further enhancing mixing efficiency. The arrangement of the inlet through-hole 131a and outlet through-hole 131c ensures uniform and thorough mixing of fresh gas and EGR exhaust gas, achieving precise control of the EGR rate. This design significantly improves engine combustion efficiency and helps reduce the content of harmful components in emissions, meeting environmental standards.

[0078] like Figure 6 As shown, the diameter D of the through hole 131b in the EGR region is... E The diameter D of the intake through-hole 131a 进 The diameter D of the air outlet through hole 131c 出 Increasing sequentially, thus satisfying D 出 >D 进 >D E The diameter D of the intake through-hole 131a 进 The diameter D of the exhaust port 131c is configured to be related to the engine's maximum EGR rate and the diameter of the EGR zone through-hole 131b. 出 Configured to have a diameter D of the EGR region via 131b EThe diameter D of the intake through-hole 131a 进 Relatedly, this diameter design further optimizes the gas flow path. The intake zone through-hole 131a, serving as the channel for fresh gas to enter the mixing shuttle 131, has a larger diameter than the EGR zone through-hole 131b, facilitating a rapid influx of fresh gas and providing ample gas supply for the subsequent mixing process. The maximized diameter design of the exhaust zone through-hole 131c ensures that the mixed gas is discharged uniformly and smoothly. This structural design not only improves the quality of the gas mixture but also effectively avoids turbulence and stratification during the exhaust process, thereby further enhancing the engine's combustion efficiency and performance. Furthermore, by precisely calculating and controlling the diameter ratio of each through-hole, the system can accurately adjust the engine's maximum EGR rate to meet the engine's requirements under different operating conditions.

[0079] like Figure 6 As shown, the length of the mixing shuttle 131 in the direction of fresh gas intake (hereinafter referred to as the length of the mixing shuttle 131) is L. L is greater than a set length to ensure mixing effect. Intake zone structure a EGR zone structure c and air outlet zone structure b Each through-hole's opening direction is consistent with the gas transmission direction; specifically, the through-hole 131a in the intake zone is drilled along the direction of fresh air intake, the through-hole in the outlet zone is drilled along the direction of mixed gas outlet, and the through-hole 131b in the EGR zone is drilled along the direction of EGR exhaust gas outlet. This design not only ensures smooth gas flow but also effectively improves the overall efficiency of the EGR mixing device. The clear division of the intake, EGR, and outlet zones allows each part to fully utilize its specific function, working together to achieve optimal gas mixing. Furthermore, the relatively long length L of the mixing shuttle 131 in the direction of fresh gas intake ensures sufficient time and space for thorough mixing within the mixing shuttle 131, further enhancing the uniformity and stability of the mixed gas. This design not only improves engine combustion efficiency but also helps reduce emissions, providing strong support for the environmental performance of motor vehicles.

[0080] In some embodiments, the diameter D of the EGR region via 131b is... E The diameter D of the intake through-hole 131a 进 The diameter D of the air outlet through hole 131c 出The design features consistent diameters, which simplify the manufacturing process and reduce production costs. Furthermore, the uniform diameter of the through-holes in each region ensures relatively balanced flow resistance of the gas as it flows through different areas, preventing localized excessively fast or slow airflow caused by diameter differences. This further ensures smooth gas flow throughout the EGR mixing unit. Additionally, the consistent diameter design helps maintain pressure balance between regions, providing favorable conditions for efficient gas mixing. In practical applications, this design allows the EGR mixing unit to better adapt to gas flow requirements under different operating conditions, improving engine operational stability and response speed.

[0081] In some embodiments, the shell surface of the mixing shuttle 131 is uniformly provided with holes of the same size from different directions. This uniformly distributed hole design further optimizes the gas flow characteristics. The uniformly distributed holes from all directions ensure that gas can enter the mixing shuttle 131 omnidirectionally and uniformly, avoiding excessive concentration or absence of gas in one direction, thereby improving the uniformity and efficiency of gas mixing. Furthermore, this uniformly distributed hole design also helps reduce stress concentration on the shell surface, improving the structural strength and durability of the mixing shuttle 131.

[0082] In some embodiments, the outlet ends of both the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 are close to the mixing shuttle 131 but at a certain distance from it. The EGR exhaust gas directly contacts the mixing shuttle 131, preventing it from contacting the wall of the low-temperature intake pipe 1, effectively preventing icing in the EGR pipeline. Even in low-temperature environments, if icing occurs at the head of the mixing shuttle 131 due to the low intake air temperature, because the head of the mixing shuttle 131 is located in the center of the pipeline and the cavity there has an enlarged diameter, it will not affect the intake of fresh gas from all sides, ensuring engine operation.

[0083] Figure 7 This is a schematic diagram of the external shape of an EGR exhaust pipe provided for at least one embodiment of this disclosure. Figure 7 As shown, in Figure 1 Building upon this foundation, to further enhance gas mixing and flow efficiency, both the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 are hollow circular pipes of a predetermined diameter. Furthermore, the outlet ends of both the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 employ flared structures (also known as irregular structures or flared umbrella structures). These flared structures are designed to guide gas into the mixing shuttle 131 structure more effectively. This design not only helps the EGR exhaust gas enter the mixing shuttle 131 more smoothly, but also achieves more efficient gas mixing.

[0084] Figure 8This is a cross-sectional schematic diagram of an EGR exhaust pipe provided in at least one embodiment of this disclosure. Figure 8 As shown, the internal structure of the flared structure is shown in detail in the cross-sectional direction indicated by the two A's in 7. This design can improve the gas flow trajectory, reduce eddies and turbulence, and ensure that the EGR exhaust gas can be mixed with the fresh gas more evenly and efficiently, thus improving the mixing effect.

[0085] In some embodiments, for any one of the first EGR exhaust pipe 2 or the second EGR exhaust pipe 3, the flared diameter D2 of the EGR exhaust pipe is 1.2 to 1.3 times the inner diameter D1 of the EGR exhaust pipe, i.e., D2 = (1.2 to 1.3)D1, and the flared height H of the EGR exhaust pipe is 0.15 to 0.3 times the flared diameter D2 of the EGR exhaust pipe, i.e., H = (0.15 to 0.3)D2. For obtaining the flared diameter D2, inner diameter D1, and flared height H of the EGR exhaust pipe, see [link to relevant documentation]. Figure 8 At this size, the EGR exhaust gas can diffuse before entering the mixing shuttle. Diffusion can better reduce the pipeline resistance of the first and second EGR exhaust pipes and increase the contact area with the mixing shuttle. Controlling the flare diameter D2 and flare height H of the EGR exhaust pipe is to avoid gas separation problems caused by long-distance diffusion, which is detrimental to the performance of the EGR mixing device.

[0086] In some embodiments, for either the first EGR exhaust pipe 2 or the second EGR exhaust pipe 3, the flared diameter D2 of the EGR exhaust pipe is 0.9 to 0.95 times the length L of the mixing shuttle 131 in the fresh gas inlet direction, i.e., D2 = (0.9 - 0.95)L. The length L of the mixing shuttle 131 in the fresh gas inlet direction is obtained from [reference needed]. Figure 6 Specifically, the flared diameter D2 of the EGR exhaust pipe must not exceed the length L of the mixing shuttle 131 in the fresh gas inlet direction to ensure that as much EGR exhaust gas as possible enters the interior of the mixing shuttle 131, guaranteeing effective mixing between the EGR exhaust gas and the fresh intake gas. The flared section can slow down the EGR exhaust gas. Setting the flared diameter D2 of the EGR exhaust pipe slightly larger, and greater than 0.9L, ensures sufficient contact between the EGR exhaust gas and the surface of the mixing shuttle 131, guaranteeing that more EGR exhaust gas enters the interior of the mixing shuttle 131.

[0087] In some embodiments, for any one of the first EGR exhaust pipe 2 or the second EGR exhaust pipe 3, the distance W from the outlet plane of the EGR exhaust pipe to the surface of the mixing shuttle is 0.3-0.4 times the inner diameter D1 of the EGR exhaust pipe. The distance W from the outlet plane of the EGR exhaust pipe to the surface of the mixing shuttle is obtained from [reference needed]. Figure 10 The control distance W enables the control of the engine's EGR rate. When the distance W is less than the first set distance, the outlet end of the EGR exhaust pipe is in contact with the surface of the mixing shuttle, which will cause excessive EGR exhaust gas resistance, which is not conducive to improving the engine's EGR rate. When the distance W exceeds the second set distance, it will cause gas diffusion, which is not conducive to the EGR exhaust gas entering the interior of the mixing shuttle.

[0088] Figure 9 A schematic diagram of an example of an EGR mixing device provided in at least one embodiment of this disclosure. (See attached diagram.) Figure 9 As shown, the EGR flow valve 4 includes an EGR flow valve plate 41. The EGR flow valve plate 41 is designed to precisely control the flow rate of EGR exhaust gas. The opening and closing degree of the EGR flow valve plate 41 can be flexibly adjusted by an electronic controller to adapt to the engine's needs under different operating conditions. When the engine is under low load, the EGR flow valve plate 41 is moderately open, allowing a suitable amount of EGR exhaust gas to flow back to the intake manifold to reduce combustion temperature and reduce nitrogen oxide emissions. When the engine is under high load or requires high power output, the EGR flow valve plate 41 is almost completely closed to ensure an adequate supply of fresh air to maintain efficient engine operation. Furthermore, the overall structure of the EGR flow valve 4 is robust and durable, capable of withstanding the high temperature and high pressure environment during engine operation, ensuring long-term stable operation.

[0089] In some embodiments, the EGR mixing unit further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located at the fresh gas inlet 11 to acquire the temperature of the fresh gas. The second temperature sensor is located at the mixed gas outlet 12 to acquire the temperature of the mixed gas. The use of these two temperature sensors allows for real-time monitoring of temperature changes in both the fresh gas and the mixed gas. The data from the first temperature sensor helps to understand the initial temperature of the gas entering the system, while the data from the second temperature sensor reflects the temperature state of the mixed gas before it leaves the system. This data is crucial for engine performance optimization and emissions control.

[0090] Figure 11 This is a structural block diagram of an engine provided for at least one embodiment of the present disclosure. (See diagram below.) Figure 11 As shown, the engine 100 includes an EGR mixing device 101 as described in the above embodiment.

[0091] Figure 12 This is a structural block diagram of a motor vehicle provided for at least one embodiment of the present disclosure. For example... Figure 12 As shown, the motor vehicle 200 includes an EGR mixing device 101 as described in the above embodiment.

[0092] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. An EGR mixing device, characterized in that, include: An intake pipe is provided with a fresh gas inlet at one end and a mixed gas outlet at the other end, and an EGR mixing chamber is provided inside the intake pipe. A first EGR exhaust pipe, wherein the first EGR exhaust pipe is connected to one side of the EGR mixing chamber; and, The second EGR exhaust pipe is connected to the other side of the EGR mixing chamber; The EGR mixing chamber is equipped with a mixing shuttle, which is located between the outlet end of the first EGR exhaust pipe and the outlet end of the second EGR exhaust pipe. The mixing shuttle is a hollow three-dimensional shuttle structure. In the direction of fresh gas intake, the shell surface of the mixing shuttle is sequentially provided with an intake zone through hole facing the fresh gas inlet, an EGR zone through hole facing the first EGR exhaust pipe and the second EGR exhaust pipe, and an outlet zone through hole facing the mixed gas outlet.

2. The EGR mixing device according to claim 1, characterized in that, The diameter of the EGR mixing chamber is larger than the diameter of the fresh gas inlet.

3. The EGR mixing apparatus according to claim 1 or 2, characterized in that, The mixing shuttle includes an air intake zone structure facing the fresh gas inlet, an air outlet zone structure facing the mixed gas outlet, and an EGR zone structure facing the first EGR exhaust pipe and the second EGR exhaust pipe. The surface of the air intake area structure is provided with a plurality of air intake through holes, the surface of the air outlet area structure is provided with a plurality of air outlet through holes, the surface of the EGR area structure is provided with a plurality of EGR through holes, and the pipe diameter of the EGR area structure is larger than the pipe diameter of the air intake area structure and the pipe diameter of the air outlet area structure.

4. The EGR mixing apparatus according to claim 3, characterized in that, In the direction of fresh gas intake, the pipe diameter at different positions of the mixing shuttle first increases and then decreases, and both the intake zone structure and the outlet zone structure are pointed structures.

5. The EGR mixing apparatus according to claim 1 or 2, characterized in that, The interior of the EGR mixing chamber is also equipped with: A mixing shuttle support is fixed to the inner wall of the EGR mixing chamber, and the mixing shuttle support is provided with a mounting mechanism for the mixing shuttle, through which the mixing shuttle is installed in the middle position of the EGR mixing chamber.

6. The EGR mixing apparatus according to claim 1 or 2, characterized in that, The diameters of the EGR zone through-hole, the air inlet zone through-hole, and the air outlet zone through-hole are the same. Furthermore, the opening direction of the EGR zone through-hole is the same as the air outlet direction of the EGR exhaust gas in the first EGR exhaust pipe and the second EGR exhaust pipe. The opening direction of the air inlet zone through-hole is the same as the air inlet direction of the fresh gas. The opening direction of the air outlet zone through-hole is the same as the air outlet direction of the mixed gas.

7. The EGR mixing apparatus according to claim 1 or 2, characterized in that, Both the first EGR exhaust pipe and the second EGR exhaust pipe are hollow circular pipes, and both the outlet end of the first EGR exhaust pipe and the outlet end of the second EGR exhaust pipe have a flared structure.

8. The EGR mixing apparatus according to claim 1 or 2, characterized in that, Also includes: An EGR flow valve is provided in either the first EGR exhaust pipe or the second EGR exhaust pipe.

9. An engine, characterized in that, The engine includes the EGR mixing unit as described in any one of claims 1 to 8.

10. A motor vehicle, characterized in that, The motor vehicle includes the EGR mixing device as described in any one of claims 1 to 8.

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