Egr mixing system, engine and motor vehicle

Abstract

The disclosure provides an EGR mixing system, an engine and a motor vehicle, and relates to the technical field of exhaust gas recirculation, wherein the system comprises an air intake pipe, a first EGR exhaust pipe and a second EGR exhaust pipe. The inside of the air intake pipe is provided with an EGR mixing cavity. The first EGR exhaust pipe is in communication with one side of the EGR mixing cavity. The second EGR exhaust pipe is in communication with the other side of the EGR mixing cavity. The inside of the EGR mixing cavity is provided with a mixing shuttle body, which is a hollow three-dimensional shuttle-shaped structure. In the air intake direction of fresh air, the shell surface of the mixing shuttle body is sequentially provided with an air intake area through hole, an EGR area through hole and an air outlet area through hole, so that the EGR exhaust gas entering through the EGR area through hole and the fresh air entering through the air intake area through hole form mixed gas in the inside of the mixing shuttle body and are discharged along the air outlet area through hole. The system makes the EGR exhaust gas have zero contact with the wall surface of the air intake pipe, and reduces 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 hybrid system, an engine, and a motor vehicle. Background Technology

[0002] With increasingly stringent emission regulations, the use of exhaust gas recirculation (EGR) systems 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, because EGR exhaust gas contains a high amount of water vapor, 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 systems mainly employ either a natural mixing structure or a perforated mixing structure. For natural mixing structures, small-displacement engines struggle to achieve a long mixing section, limiting the mixing effect of the EGR system. 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 perforated mixing structures, the EGR exhaust gas directly impacts the walls 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 manifold of the EGR mixing system of the relevant technology is prone to icing in low-temperature environments. Summary of the Invention

[0005] This disclosure provides an EGR hybrid system, 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 hybrid system applied to an engine, 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 ends of the first EGR exhaust pipe and 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. This allows the EGR exhaust gas entering through the EGR zone through hole and the fresh gas entering through the intake zone through hole to form a mixed gas inside the mixing shuttle and be discharged along the outlet zone through hole.

[0011] The EGR hybrid system provided in at least one embodiment of this disclosure further includes:

[0012] EGR flow valve, which is installed in the first EGR exhaust pipe, is used to control the flow of EGR exhaust gas through the first EGR exhaust pipe.

[0013] The EGR flow valve is configured such that: during the cold start of the EGR mixing system, the EGR flow valve is set to a fully open state, so that the EGR exhaust gas simultaneously passes through the first EGR exhaust gas pipe and the second EGR exhaust gas pipe to warm up the EGR mixing system; and after the EGR mixing system is started, the set opening degree of the EGR flow valve is related to the temperature deviation between the temperature of the fresh gas and the temperature of the mixed gas.

[0014] The EGR hybrid system provided in at least one embodiment of this disclosure further includes:

[0015] Controller, which is connected to the EGR flow valve;

[0016] The controller is configured as follows:

[0017] Upon receiving the EGR mixing system start-up command, the system acquires the temperature of the fresh gas. When the temperature of the fresh gas is lower than a preset lower limit, it generates first information characterizing the cold start of the EGR mixing system, controls the EGR flow valve to fully open, allowing EGR exhaust gas to simultaneously enter the intake pipe through both the first and second EGR exhaust pipes, thus achieving the warm-up operation; and...

[0018] After the EGR mixing system is started, the temperature deviation between the temperature of the fresh gas and the temperature of the mixed gas, as well as the EGR flow rate formed by superimposing the flow rate of the first EGR exhaust pipe and the flow rate of the second EGR exhaust pipe, are obtained. Based on the temperature deviation and the EGR flow rate, the set opening degree of the EGR flow valve is dynamically adjusted.

[0019] In the EGR hybrid system provided in at least one embodiment of this disclosure, the controller is further configured to:

[0020] After the EGR mixing system is started at room temperature, the engine coolant temperature is monitored; and,

[0021] In response to the engine coolant temperature reaching a set temperature, second information is generated to indicate that the engine has entered a normal operating state, and the EGR flow valve is fully closed, so that the EGR exhaust gas enters the intake manifold through the second EGR exhaust gas pipe to increase the EGR exhaust gas pressure in the intake manifold.

[0022] In the EGR hybrid system provided in at least one embodiment of this disclosure, the controller is further configured to:

[0023] Upon receiving the EGR mixing system start command, when the temperature of the fresh gas is higher than a preset upper temperature limit and the EGR flow rate formed by the sum of the flow rates of the first EGR exhaust pipe and the second EGR exhaust pipe is lower than the EGR flow rate limit, the system outputs second information indicating that there is no risk of icing in the EGR mixing system's intake pipe, and controls the EGR flow valve to be fully closed, allowing the EGR exhaust gas to enter the intake pipe through the second EGR exhaust pipe, thereby increasing the EGR exhaust gas pressure in the intake pipe; and,

[0024] Upon receiving the EGR mixing system start command, when the temperature of the fresh gas is between the lower temperature limit and the upper temperature limit, or when the temperature of the fresh gas is higher than the upper temperature limit and the EGR flow rate is higher than the EGR flow rate limit, the temperature deviation and the EGR flow rate are obtained, and the set opening degree of the EGR flow valve is adjusted based on the temperature deviation and the EGR flow rate.

[0025] In the EGR mixing system provided in at least one embodiment of this disclosure, the diameter of the EGR mixing chamber is larger than the diameter of the fresh gas inlet, and in the direction of fresh gas intake, the pipe diameter at different positions of the mixing shuttle shows a trend of first increasing and then decreasing.

[0026] The air intake area structure facing the fresh gas inlet and the air outlet area structure facing the mixed gas outlet of the mixing shuttle are both pointed structures. The surface of the air intake area structure is provided with air intake through holes, and the surface of the air outlet area structure is provided with air outlet through holes.

[0027] In the EGR mixing system provided in at least one embodiment of this disclosure, the interior of the EGR mixing chamber is further provided with:

[0028] A mixing shuttle support is fixed to the inner wall of the EGR mixing chamber, and the mixing shuttle support is used to install the mixing shuttle in the middle position of the EGR mixing chamber.

[0029] In the EGR mixing system provided in at least one embodiment of this disclosure, the diameter of the through hole in the EGR zone, the diameter of the through hole in the air inlet zone, and the diameter of the through hole in the air outlet zone increase sequentially.

[0030] The diameter of the intake zone through-hole is configured to be related to the maximum EGR rate of the engine and the diameter of the EGR zone through-hole, and the diameter of the exhaust zone through-hole is configured to be related to the diameter of the EGR zone through-hole and the diameter of the intake zone through-hole.

[0031] In the EGR mixing system 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.

[0032] At least one embodiment of this disclosure also provides an engine that includes the EGR hybrid system provided in any embodiment of this disclosure.

[0033] At least one embodiment of this disclosure also provides a motor vehicle including the EGR hybrid system provided in any embodiment of this disclosure.

[0034] Compared with related technologies, the EGR mixing system, 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.

[0035] 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

[0036] 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.

[0037] Figure 1 A schematic diagram of the structure of an EGR hybrid system provided for at least one embodiment of this disclosure;

[0038] Figure 2 A schematic diagram of the external shape of an EGR hybrid system provided for at least one embodiment of this disclosure;

[0039] Figure 3 A schematic diagram of another EGR hybrid system provided for at least one embodiment of this disclosure;

[0040] Figure 4 A schematic diagram of the structure of yet another EGR hybrid system provided in at least one embodiment of this disclosure;

[0041] Figure 5 A schematic diagram of the gas flow direction of another EGR mixing system provided for at least one embodiment of the present disclosure;

[0042] Figure 6 This is a schematic diagram of the structure of a hybrid shuttle provided in at least one embodiment of the present disclosure;

[0043] Figure 7 A schematic diagram of the external shape of an EGR exhaust pipe provided for at least one embodiment of this disclosure;

[0044] Figure 8 A cross-sectional schematic diagram of an EGR exhaust pipe provided in at least one embodiment of this disclosure;

[0045] Figure 9 A schematic diagram of the structure of an EGR hybrid system example provided in at least one embodiment of this disclosure;

[0046] Figure 10 A control diagram for an example of EGR hybrid system control logic provided in at least one embodiment of this disclosure;

[0047] Figure 11 A structural block diagram of an engine provided for at least one embodiment of this disclosure;

[0048] Figure 12 This is a structural block diagram of a motor vehicle provided for at least one embodiment of the present disclosure.

[0049] Figure Labels

[0050] 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;

[0051] 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 hybrid system; 200-motor vehicle. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] In the description of this disclosure, "multiple" means at least two, such as two or three, unless otherwise expressly and specifically limited.

[0055] 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.

[0056] The terms “comprising” and “having”, and any variations thereof, used in embodiments of this disclosure, are intended to cover non-exclusive inclusion. For example, a process, EGR hybrid system, 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 hybrid systems, products, or devices.

[0057] 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.

[0058] 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.

[0059] In this disclosure, the term "EGR mixing system" refers to a system capable of uniformly mixing fresh gas entering the engine with EGR exhaust gas, ensuring the uniformity of EGR exhaust gas introduction into each cylinder under various operating conditions.

[0060] 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 system.

[0061] 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.

[0062] Figure 1 This is a schematic diagram of the structure of an EGR hybrid system provided for at least one embodiment of the present disclosure. Figure 1 As shown, the EGR mixing system may include an intake pipe 1, a first EGR exhaust pipe 2, and a second EGR exhaust pipe 3.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 exhaust zone through hole 131c facing the mixed gas outlet 12. This allows the EGR exhaust gas (hereinafter referred to as exhaust gas) entering through the EGR zone through hole 131b and the fresh gas entering through the intake zone through hole 131a to form a mixed gas inside the mixing shuttle 131 and be discharged along the exhaust zone through hole 131c.

[0067] 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.

[0068] In the above scheme, the external structure of the EGR hybrid system 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 system is shown in [reference needed]. Figure 5 Fresh gas (such as air or fuel gas) flows in from 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 flows out of the intake pipe 1 in the form of a gas mixture and enters the engine to participate in combustion.

[0069] 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.

[0070] During implementation, the EGR exhaust gas output from the engine can be effectively recirculated through the EGR mixing system. This EGR exhaust gas mixes with fresh gas in the EGR mixing chamber 13 before re-entering the engine cylinder for combustion. In this process, the EGR mixing system not only ensures thorough mixing of the EGR exhaust gas and fresh gas, but also, by having the EGR exhaust gas enter from both sides of the EGR mixing chamber 13, and a mixing shuttle 131 installed in the pipeline of the EGR mixing chamber 13, the EGR exhaust gas and fresh gas mix within the mixing shuttle 131. The impact of the fresh gas ensures zero contact between the EGR exhaust gas and the wall of the intake manifold 1, avoiding the risk of water precipitation and icing of the intake manifold 1 due to the low wall temperature of the intake manifold 1 in low-temperature environments.

[0071] Some embodiments of this disclosure also provide engines and motor vehicles corresponding to the above-described EGR hybrid system.

[0072] The EGR hybrid system provided in at least one embodiment of this disclosure is applicable to any existing engine application scenario with an EGR hybrid system, and the embodiments of this disclosure are not limited thereto. For example, this EGR hybrid system can be applied to diesel engines, gasoline engines, or hybrid engines, effectively improving engine fuel economy and emission performance by precisely controlling the EGR flow. Furthermore, due to its compact structure and high mixing efficiency, this system 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. In practical applications, this EGR hybrid system not only meets stringent emission regulations but also extends engine lifespan and reduces maintenance costs to a certain extent, demonstrating broad application potential and market value.

[0073] Compared with related technologies, the EGR mixing system proposed in this disclosure improves the structure of the intake manifold 1 by setting an EGR mixing chamber 13 inside the intake manifold 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 be discharged through the air outlet through-hole 131c. This ensures zero contact between the EGR exhaust gas and the wall of the intake manifold 1, reducing the risk of wall icing. As a result, the EGR engine can operate stably during low-temperature start-up, solving the technical problem of the intake manifold 1 being prone to icing in low-temperature environments in related technologies.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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 system, and lowering the intake resistance and pipeline resistance of the EGR mixing system. Furthermore, since the shell 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.

[0079] Figure 3 A schematic diagram of another EGR hybrid system provided for at least one embodiment of this disclosure. (See diagram below.) Figure 3 As shown, in Figure 1 Based on this, 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, capable of resisting the dynamic pressure generated during the flow of the mixed gas, effectively preventing displacement or vibration of the mixing shuttle 131. In terms of material selection, the mixing shuttle support 132 should ensure its reliability and durability under extreme operating conditions such as high temperature and high pressure. Through the installation of the mixing shuttle support 132, the overall performance of the EGR mixing system is significantly enhanced, providing solid technical support for the stable and efficient operation of the engine.

[0080] Figure 4 This is a schematic diagram of the structure of yet another EGR hybrid system provided in at least one embodiment of this disclosure. (See diagram below.) Figure 4 As shown, in Figure 1Building upon this foundation, to optimize engine performance, the EGR mixing system 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. The EGR flow valve 4 is configured such that: during a cold start of the EGR mixing system, the EGR flow valve 4 is fully open, allowing EGR exhaust gas to simultaneously flow through the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 to warm up the EGR mixing system; and after the EGR mixing system 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 design is another important design feature of this disclosure.

[0081] 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.

[0082] 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 splitting the EGR exhaust gas into two EGR exhaust pipes in non-cold-weather environments (also known as non-low-temperature environments) can be avoided, thus improving the engine's performance and emission stability in non-cold-weather environments. Simultaneously, in conjunction with an EGR flow adjustment strategy (the configuration of the EGR flow valve 4), the engine's performance under various operating conditions can be guaranteed. After the EGR mixing system is activated, i.e., when the engine is running, if the temperature difference between the fresh gas and the mixed gas does not meet the set conditions, the opening of the EGR flow valve 4 can be adjusted to reduce or increase the EGR exhaust gas flow, thereby effectively controlling the temperature of the mixed gas and ensuring the engine operates under optimal conditions. Furthermore, the EGR flow valve 4 allows the EGR mixing system to quickly adapt to different driving conditions, improving engine efficiency. Figure 4 In the illustrated embodiment, the integrated design of the EGR flow valve 4 and the first EGR exhaust pipe 2 not only simplifies the system structure but also effectively reduces manufacturing costs and maintenance difficulty. Simultaneously, this design facilitates the inspection and replacement of the EGR flow valve 4, further enhancing the reliability and service life of the EGR mixing system.

[0083] Figure 5 This is a schematic diagram of the gas flow direction of another EGR mixing system provided for at least one embodiment of this disclosure. (See diagram below.) Figure 5 As shown, in Figure 1 Based on this, the EGR exhaust gas simultaneously enters the EGR mixing chamber through both the first and second EGR exhaust pipes, mixes with fresh gas, and is then discharged. This design not only optimizes the utilization efficiency of exhaust gas but also effectively reduces the exhaust gas emission temperature, thereby minimizing potential damage to the engine and other vehicle components.

[0084] 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 in the direction of fresh gas inlet first increases and then decreases. This design is another important design feature of this disclosure.

[0085] In this system, 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 system. In the section with a smaller pipe diameter, 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 system under various operating conditions, thus improving engine combustion efficiency and emission performance.

[0086] 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 c The 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 fully blend 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 with EGR mixing structures.

[0087] 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.

[0088] 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 of the intake zone through-hole 131a is configured to be related to the engine's maximum EGR rate and the diameter of the EGR zone through-hole 131b, while the diameter of the exhaust zone through-hole 131c is directly configured to be related to the diameter of the EGR zone through-hole 131b and the diameter of the intake zone through-hole 131a. 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 of the exhaust zone through-hole 131c ensures that the mixed gas is discharged in a uniform and smooth manner. This structural design not only improves the quality of the gas-fuel 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 maximum EGR rate of the engine to meet the engine requirements under different operating conditions.

[0089] As an optional approach, such as Figure 6 As shown, the length of the mixing shuttle 131 in the fresh gas intake direction is L, which 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 exhaust zone is drilled along the direction of mixed gas exhaust, and the through-hole 131b in the EGR zone is drilled along the direction of EGR exhaust gas exhaust. This design not only ensures smooth gas flow but also effectively improves the overall efficiency of the EGR mixing system. The clear division of the intake, EGR, and exhaust 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.

[0090] As an optional implementation method, when the engine's maximum EGR rate is E%, D 进 D E and D 出 The relationship is as follows:

[0091]

[0092] D 出 =C(D) 进 +D E ),

[0093] In the formula, k is the first coefficient and C is the second coefficient.

[0094] Since only a portion of the fresh gas enters the mixing shuttle 131, while most of the EGR exhaust gas does, the value of k ranges from 0.3 to 0.5. Because the gas mass increases after mixing with the EGR exhaust gas, the diameter of the outlet orifice 131c is slightly larger than the diameter of the inlet orifice 131a, which helps reduce pipeline resistance; the value of C ranges from 1.1 to 1.2. This range ensures effective mixing of the gas within the mixing shuttle 131 while avoiding excessive pipeline resistance that could affect gas flow efficiency. Furthermore, by precisely controlling the values ​​of k and C, the performance of the EGR mixing system can be further optimized, maintaining optimal operating conditions under various circumstances. This design not only improves engine fuel economy but also contributes to enhancing the overall performance of the vehicle, providing strong support for the user's driving experience.

[0095] 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.

[0096] 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.

[0097] Figure 8 This 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.

[0098] Figure 9 A schematic diagram of the structure of an EGR hybrid system example provided in at least one embodiment of this disclosure. For example... 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.

[0099] In some embodiments, the EGR mixing system 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. Data from the first temperature sensor helps to understand the initial temperature of the gas entering the system, while 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.

[0100] In some embodiments, to improve the start-up and operating efficiency of the EGR hybrid system, the EGR hybrid system further includes a controller connected to the EGR flow valve 4. This controller may be, but is not limited to, the engine controller or the vehicle controller. The controller may be configured to perform the following steps S11-S12.

[0101] Step S11: After receiving the EGR mixing system start command, obtain the temperature of the fresh gas, and when the temperature of the fresh gas is lower than the preset lower limit, generate the first information to characterize the cold start of the EGR mixing system, control the EGR flow valve 4 to be fully open, so that the EGR exhaust gas enters the intake pipe 1 through the first EGR exhaust gas pipe 2 and the second EGR exhaust gas pipe 3 at the same time to realize the warm-up operation.

[0102] Step S12: After the EGR mixing system is started, the temperature deviation between the temperature of the fresh gas and the temperature of the mixed gas (also known as the EGR cooling temperature) and the EGR flow rate formed by the superposition of the flow rate of the first EGR exhaust pipe 2 and the flow rate of the second EGR exhaust pipe 3 are obtained. Based on the temperature deviation and the EGR flow rate, the set opening degree of the EGR flow valve 4 is dynamically adjusted.

[0103] In step S11, when the temperature of the fresh gas is low, by setting the EGR flow valve 4 to the fully open state (100% opening), the EGR exhaust gas can enter the intake manifold 1 from both ends simultaneously, thereby reducing the risk of icing. In step S12, the system precisely adjusts the opening of the EGR flow valve 4 based on real-time temperature deviation and EGR flow rate to ensure that the opening of the EGR flow valve 4 meets the engine performance requirements while effectively preventing icing. During the engine warm-up phase, the fully open state of the EGR flow valve 4 ensures full utilization of the EGR exhaust gas, accelerates the temperature rise of the intake manifold 1 and related components, shortens the warm-up time, and improves engine starting efficiency. Furthermore, this strategy also comprehensively considers the changes in EGR flow rate under different operating conditions. By dynamically adjusting the opening of the EGR flow valve 4, the optimal mixing ratio of EGR exhaust gas and fresh gas is achieved, further improving engine operating efficiency and emission performance.

[0104] In some embodiments, the engine undergoes a cold-pack test, using icing tests at different temperatures to determine the upper limit of the initiation temperature for icing of the fresh gas and the lower limit of the icing expansion temperature. This test precisely defines the critical point at which the fresh gas in the EGR mixing system begins to ic under different temperature conditions. When the temperature of the fresh gas drops below the lower limit of the icing initiation temperature, the system immediately activates an anti-icing strategy, as described in steps S11 and S12, by fully opening the EGR flow valve 4 and dynamically adjusting its opening to prevent icing. This implementation not only improves the system's reliability in extreme low-temperature environments but also provides data support for subsequent optimization design and performance enhancement.

[0105] As an optional implementation, if the temperature of the fresh gas, i.e., the first temperature, is lower than the preset lower limit, the engine operates at its rated speed and maximum torque condition. At this condition, there will be EGR flow. In this case, the controller controls the opening of the EGR flow valve 4 to 100% via step S11. After the engine starts, the set opening of the EGR flow valve 4 is dynamically adjusted based on the aforementioned temperature deviation and EGR flow. In this way, even in extremely low-temperature environments, the effective operation of the EGR system can be ensured, avoiding system failure caused by icing. Furthermore, this implementation also considers the engine's needs under different operating conditions, especially at the rated speed and maximum torque condition, further optimizing engine performance by ensuring the presence of EGR flow. By monitoring the temperature deviation and EGR flow in real time and dynamically adjusting the set opening of the EGR flow valve 4, the controller achieves precise control of the EGR exhaust gas to fresh gas mixing ratio, enhancing its adaptability and stability under various operating conditions.

[0106] As an optional implementation, during normal engine operation, the set opening of the EGR flow valve 4 is determined by the current EGR flow rate and temperature deviation. The set opening of the EGR flow valve 4 is obtained by consulting the EGR flow valve opening setting MAP based on the temperature deviation and EGR flow rate. The EGR flow valve opening setting MAP is a table or function graph pre-stored in the controller, providing the optimal set opening of the EGR flow valve 4 for different combinations of temperature deviation and EGR flow rate. In this way, the controller can quickly and accurately adjust the opening of the EGR flow valve 4 according to actual operating conditions, thereby ensuring that the EGR exhaust gas and fresh gas mix in the best ratio, further improving the engine's fuel economy and emission performance. Furthermore, this implementation enhances the flexibility and responsiveness of the EGR mixing system under various operating conditions, providing strong support for the stable operation and environmental performance of the vehicle.

[0107] In some embodiments, in order to optimize the ambient temperature operation performance of the EGR mixing system, the controller is further configured to perform the following steps S21-S22.

[0108] Step S21: After the EGR mixing system is started at room temperature, monitor the engine coolant temperature.

[0109] Step S22: In response to the engine coolant temperature reaching the set temperature, second information is generated to characterize the engine entering normal operating condition, and the EGR flow valve 4 is fully closed, so that the EGR exhaust gas enters the intake manifold 1 through the second EGR exhaust gas pipe 3 to increase the EGR exhaust gas pressure of the intake manifold 1.

[0110] In step S21, the controller monitors the engine's operating status using a water temperature sensor in the engine cooling system. This step is crucial for ensuring the engine reaches the optimal operating temperature, as excessively low water temperatures can negatively impact combustion efficiency and emissions performance. When the water temperature gradually rises and reaches the preset set temperature, it indicates that the engine has preheated and is ready for normal operation. In step S22, once the controller receives a signal that the water temperature has reached the set value, it immediately generates a second message, which serves as a marker that the engine has entered normal operating condition. Subsequently, the controller responds quickly by fully closing the EGR flow valve 4. This action aims to increase the EGR exhaust gas pressure within the intake manifold 1, as more precise control of the EGR exhaust gas recirculation is required during normal engine operation to ensure optimal combustion and emissions control. By closing the EGR flow valve 4, the EGR exhaust gas pressure is increased, allowing the engine to more flexibly adjust the intake pressure according to current operating demands, thereby optimizing overall performance.

[0111] As an optional implementation, under normal temperature testing, the engine operates at its rated speed and maximum torque condition. At this condition, there is EGR flow. When the engine coolant temperature reaches 90°C, the engine has entered normal operating condition, and the opening of the EGR flow valve 4 is set to 0%. Under this condition, the EGR flow valve 4 is completely closed, ensuring that EGR exhaust gas does not enter the intake manifold 1 uncontrolled. This is crucial for maintaining the stability and efficiency of the engine at its rated speed and maximum torque condition.

[0112] In some embodiments, the controller is also configured to perform the following steps S13-S14.

[0113] Step S13: After receiving the EGR mixing system start command, when the temperature of the fresh gas is higher than the preset temperature limit and the EGR flow rate formed by the sum of the flow rate of the first EGR exhaust pipe 2 and the flow rate of the second EGR exhaust pipe 3 is lower than the EGR flow rate limit, output the second information to indicate that there is no risk of icing in the intake pipe 1 of the EGR mixing system, and control the EGR flow valve 4 to be fully closed, so that the EGR exhaust gas enters the intake pipe 1 through the second EGR exhaust pipe 3 to increase the EGR exhaust gas pressure in the intake pipe 1.

[0114] Step S14: After receiving the EGR mixing system start command, when the temperature of the fresh gas is between the lower temperature limit and the upper temperature limit, or when the temperature of the fresh gas is higher than the upper temperature limit and the EGR flow rate (also known as EGR flow) is higher than the EGR flow limit, the temperature deviation and EGR flow are obtained, and the set opening degree of the EGR flow valve 4 is adjusted based on the temperature deviation and EGR flow.

[0115] In step S13, when the temperature of the fresh gas is high and the current EGR flow rate is low, the system is considered to have no risk of icing, and the EGR flow valve 4 is fully closed. At this time, the EGR exhaust gas enters the intake manifold 1 from one side. In step S14, by adjusting the set opening of the EGR flow valve 4, the amount of EGR exhaust gas entering the intake manifold 1 can be precisely controlled. This ensures the EGR mixing effect under normal operating conditions while preventing the intake manifold 1 from icing due to excessively low EGR exhaust gas temperature, thus ensuring stable engine operation. Furthermore, this control method can flexibly adjust the EGR strategy according to real-time operating conditions, improving engine fuel economy and emissions performance.

[0116] As an optional implementation, for example, when the engine is operating under cyclic loading conditions and the opening of the EGR flow valve 4 is not zero, the EGR flow rate and the temperature deviation between the data from the first and second temperature sensors are measured. The opening of the EGR flow valve 4 is then controlled based on the EGR flow rate and temperature deviation. When the opening of the EGR flow valve 4 is adjusted to an appropriate position, the mixing effect of EGR exhaust gas and fresh gas in the intake manifold 1 can be further optimized. At this time, if the EGR flow rate is large and the temperature deviation is small, it indicates that the temperature of the EGR exhaust gas is relatively high. The opening of the EGR flow valve 4 can be appropriately reduced to reduce the amount of EGR exhaust gas entering the intake manifold 1, thereby preventing the engine intake temperature from becoming too high and affecting combustion efficiency. Conversely, if the EGR flow rate is low and the temperature deviation is large, it indicates that the temperature of the EGR exhaust gas is relatively low. In this case, the opening of the EGR flow valve 4 should be increased appropriately to increase the amount of EGR exhaust gas entering the intake manifold 1, thereby improving the mixing uniformity of the EGR exhaust gas and fresh gas. At the same time, the heat of the exhaust gas is used to increase the intake temperature, which helps to improve the combustion process of the engine, reduce emissions, and improve fuel economy.

[0117] In some embodiments, the EGR flow limit in steps S13 and S14 is set to 20% to 30% of the engine's maximum EGR flow. During engine operation, if the EGR flow is too low, it may not meet the EGR mixing system's demand for EGR exhaust gas, thus affecting the EGR effect. If the EGR flow is too high, it may lead to excessive EGR exhaust gas in the intake manifold 1, increasing the risk of icing and negatively impacting the engine's fuel economy and emissions performance. Therefore, setting the EGR flow limit to 20% to 30% of the engine's maximum EGR flow ensures both EGR effectiveness and engine stability and fuel economy. This setting range also offers some flexibility, allowing for fine-tuning based on different engine operating conditions and emission requirements to meet practical application needs.

[0118] Figure 10 A control diagram illustrating an example of EGR hybrid system control logic provided in at least one embodiment of this disclosure. (See diagram for example.) Figure 10 As shown, the control logic of this EGR mixing system controls the opening of the EGR flow valve based on the current temperature of the fresh gas, the EGR flow rate, and the temperature of the mixed gas. When the temperature of the fresh gas is below the lower limit, the EGR flow valve is set to fully open, and the EGR exhaust gas enters the inlet pipe from both sides simultaneously, reducing the risk of icing. When the temperature of the fresh gas is above the upper limit and the current EGR flow rate is low, the system is considered to have no risk of icing, and the EGR flow valve is set to fully close, and the EGR exhaust gas enters the inlet pipe from one side. Except for the above two cases, the required opening of the EGR flow valve is determined by the current EGR flow rate and temperature deviation. The set opening of the EGR flow valve is obtained by looking up the EGR flow valve opening setting MAP based on the temperature deviation and EGR flow rate.

[0119] 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 system 101 as described in the above embodiment.

[0120] 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 hybrid system 101 as described in the above embodiment.

[0121] 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 hybrid system applied to an engine, 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 ends of the first EGR exhaust pipe and 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. This allows the EGR exhaust gas entering through the EGR zone through hole and the fresh gas entering through the intake zone through hole to form a mixed gas inside the mixing shuttle and be discharged along the outlet zone through hole.

2. The EGR hybrid system according to claim 1, characterized in that, Also includes: EGR flow valve, which is installed in the first EGR exhaust pipe, is used to control the flow of EGR exhaust gas through the first EGR exhaust pipe. The EGR flow valve is configured such that: during the cold start of the EGR mixing system, the EGR flow valve is set to a fully open state, so that the EGR exhaust gas simultaneously passes through the first EGR exhaust gas pipe and the second EGR exhaust gas pipe to warm up the EGR mixing system; and after the EGR mixing system is started, the set opening degree of the EGR flow valve is related to the temperature deviation between the temperature of the fresh gas and the temperature of the mixed gas.

3. The EGR hybrid system according to claim 2, characterized in that, Also includes: Controller, which is connected to the EGR flow valve; The controller is configured as follows: Upon receiving the EGR mixing system start-up command, the system acquires the temperature of the fresh gas. When the temperature of the fresh gas is lower than a preset lower limit, it generates first information characterizing the cold start of the EGR mixing system and controls the EGR flow valve to fully open, allowing EGR exhaust gas to simultaneously enter the intake manifold through both the first and second EGR exhaust pipes to achieve the warm-up operation; and... After the EGR mixing system is started, the temperature deviation between the temperature of the fresh gas and the temperature of the mixed gas, as well as the EGR flow rate formed by superimposing the flow rate of the first EGR exhaust pipe and the flow rate of the second EGR exhaust pipe, are obtained. Based on the temperature deviation and the EGR flow rate, the set opening degree of the EGR flow valve is dynamically adjusted.

4. The EGR hybrid system according to claim 3, characterized in that, The controller is also configured to: After the EGR mixing system is started at room temperature, the engine coolant temperature is monitored; and, In response to the engine coolant temperature reaching a set temperature, second information is generated to indicate that the engine has entered a normal operating state, and the EGR flow valve is fully closed, so that the EGR exhaust gas enters the intake manifold through the second EGR exhaust gas pipe to increase the EGR exhaust gas pressure in the intake manifold.

5. The EGR hybrid system according to claim 3 or 4, characterized in that, The controller is also configured to: Upon receiving the EGR mixing system start command, when the temperature of the fresh gas is higher than a preset upper temperature limit and the EGR flow rate formed by the sum of the flow rates of the first EGR exhaust pipe and the second EGR exhaust pipe is lower than the EGR flow rate limit, the system outputs second information indicating that there is no risk of icing in the EGR mixing system's intake pipe, and controls the EGR flow valve to be fully closed, allowing the EGR exhaust gas to enter the intake pipe through the second EGR exhaust pipe, thereby increasing the EGR exhaust gas pressure in the intake pipe; and, Upon receiving the EGR mixing system start command, when the temperature of the fresh gas is between the lower temperature limit and the upper temperature limit, or when the temperature of the fresh gas is higher than the upper temperature limit and the EGR flow rate is higher than the EGR flow rate limit, the temperature deviation and the EGR flow rate are obtained, and the set opening degree of the EGR flow valve is adjusted based on the temperature deviation and the EGR flow rate.

6. The EGR hybrid system according to any one of claims 1-4, characterized in that, The diameter of the EGR mixing chamber is larger than the diameter of the fresh gas inlet, and in the direction of fresh gas intake, the pipe diameter at different positions of the mixing shuttle first increases and then decreases. The air intake area structure facing the fresh gas inlet and the air outlet area structure facing the mixed gas outlet of the mixing shuttle are both pointed structures. The surface of the air intake area structure is provided with air intake through holes, and the surface of the air outlet area structure is provided with air outlet through holes.

7. The EGR hybrid system according to any one of claims 1-4, 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 used to install the mixing shuttle in the middle position of the EGR mixing chamber.

8. The EGR hybrid system according to any one of claims 1-4, characterized in that, The diameters of the through holes in the EGR zone, the air inlet zone, and the air outlet zone increase sequentially. The diameter of the intake zone through-hole is configured to be related to the maximum EGR rate of the engine and the diameter of the EGR zone through-hole, and the diameter of the exhaust zone through-hole is configured to be related to the diameter of the EGR zone through-hole and the diameter of the intake zone through-hole.

9. The EGR hybrid system according to any one of claims 1-4, 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.

10. An engine, characterized in that, The engine includes the EGR hybrid system as described in any one of claims 1 to 9.

11. A motor vehicle, characterized in that, The motor vehicle includes the EGR hybrid system as described in any one of claims 1 to 9.

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