EGR mixing system, engine and motor vehicle

Abstract

The invention provides an EGR mixing system, an engine and a motor vehicle, and relates to the technical field of exhaust gas recirculation, and the system comprises a gas inlet connecting pipe, a first EGR exhaust gas pipe and a second EGR exhaust gas pipe. An EGR mixing cavity is formed in the air inlet connecting pipe. The first EGR waste gas pipe communicates with one side of the EGR mixing cavity. And the second EGR waste gas pipe is communicated with the other side of the EGR mixing cavity. A mixing shuttle body is arranged in the EGR mixing cavity and is of a hollow three-dimensional shuttle-shaped structure, and in the air inlet direction of fresh air, an air inlet area through hole, an EGR area through hole and an air outlet area through hole are sequentially formed in the surface of a shell of the mixing shuttle body. EGR waste gas entering through the EGR area through hole and fresh gas entering through the gas inlet area through hole form mixed gas in the mixing shuttle body, and the mixed gas is exhausted along the air outlet area through hole. According to the system, EGR waste gas is in zero contact with the wall face of the gas inlet connecting pipe, and the wall face icing risk is reduced.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of exhaust gas recirculation, and in particular relates to an EGR mixing system, an engine and a motor vehicle. Background Art

[0002] With increasingly stringent emissions regulations, exhaust gas recirculation (EGR) systems have become an important means of reducing nitrogen oxide (NOX) emissions. Under normal operating conditions, the temperature of EGR exhaust gas ranges from 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 forms ice on the inner wall of the intake manifold, reducing the intake air flow area and affecting engine performance.

[0003] In related technologies, EGR mixing systems primarily utilize natural mixing or perforated mixing structures. Natural mixing structures make it difficult for small-displacement engines to achieve a long mixing section, which limits the mixing effectiveness of the EGR mixing system. Furthermore, in winter or cold regions, the high-temperature EGR exhaust gas collides with the cool intake manifold, causing water in the EGR exhaust gas to precipitate and form ice. With perforated mixing structures, the EGR exhaust gas directly impacts the wall of the intake manifold. When the engine is in a cold environment, the low wall temperature of the intake manifold can also cause ice formation.

[0004] In summary, the intake pipe of the EGR mixing system of the related art is prone to icing risk in a low temperature environment. Summary of the Invention

[0005] The present disclosure provides an EGR mixing system, an engine, and a motor vehicle, which aim to at least to some extent solve the technical problem of the related art that an intake pipe is prone to icing risk in a low-temperature environment.

[0006] At least one embodiment of the present disclosure provides an EGR mixing system, applied to an engine, comprising:

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

[0008] a first EGR exhaust pipe, the first EGR exhaust pipe being in communication with one side of the EGR mixing chamber; and

[0009] a second EGR exhaust pipe, the second EGR exhaust pipe being in communication with the other side of the EGR mixing chamber;

[0010] In which, a mixing shuttle is provided inside the EGR mixing chamber, and the mixing shuttle is provided between the outlet end of the first EGR exhaust pipe and the outlet end of the second EGR exhaust pipe, and the mixing shuttle is a hollow three-dimensional shuttle-shaped structure. In the intake direction of the fresh gas, the shell surface of the mixing shuttle is sequentially provided with an intake area through-hole facing the fresh gas inlet, an EGR area through-hole facing the first EGR exhaust pipe and the second EGR exhaust pipe, and an outlet area through-hole facing the mixed gas outlet, so that the EGR exhaust gas entering through the EGR area through-hole and the fresh gas entering through the intake area through-hole form a mixed gas inside the mixing shuttle and are discharged along the outlet area through-hole.

[0011] At least one embodiment of the present disclosure provides an EGR mixing system further comprising:

[0012] an EGR flow valve, the EGR flow valve being provided in the first EGR exhaust pipe and being used for controlling the on-off of the EGR exhaust gas flowing through the first EGR exhaust pipe;

[0013] In which, the EGR circulation valve is configured as follows: when the EGR mixing system is cold-started, the EGR circulation valve is set to a fully open state so that the EGR exhaust gas passes through the first EGR exhaust pipe and the second EGR exhaust pipe at the same time to warm up the EGR mixing system, and after the EGR mixing system is started, the set opening of the EGR circulation valve is related to the temperature deviation between the temperature of the fresh gas and the temperature of the mixed gas.

[0014] At least one embodiment of the present disclosure provides an EGR mixing system further comprising:

[0015] a controller connected to the EGR flow valve;

[0016] Wherein, the controller is configured as follows:

[0017] After receiving the EGR mixing system start-up instruction, obtaining the temperature of the fresh gas, and when the temperature of the fresh gas is lower than a preset lower temperature limit, generating first information for indicating the cold start of the EGR mixing system, controlling the EGR flow valve to fully open so that the EGR exhaust gas enters the intake pipe through the first EGR exhaust pipe and the second EGR exhaust pipe at the same time, thereby 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 and the EGR flow formed by the flow of the first EGR exhaust pipe superimposed on the flow of the second EGR exhaust pipe are obtained, and the set opening of the EGR circulation valve is dynamically adjusted based on the temperature deviation and the EGR flow.

[0019] In the EGR mixing system provided by at least one embodiment of the present disclosure, the controller is further configured to:

[0020] After the EGR mixing system is started at room temperature, monitoring the water temperature of the engine; and,

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

[0022] In the EGR mixing system provided by at least one embodiment of the present disclosure, the controller is further configured to:

[0023] After receiving the EGR mixing system start-up instruction, when the temperature of the fresh gas is higher than a preset temperature upper limit and the EGR flow rate formed by the sum of the flow rate of the first EGR exhaust pipe and the flow rate of the second EGR exhaust pipe is lower than the EGR flow rate limit, outputting second information indicating that there is no icing risk in the intake pipe of the EGR mixing system, and controlling the EGR flow valve to be fully closed so that the EGR exhaust gas enters the intake pipe through the second EGR exhaust pipe to increase the EGR exhaust gas pressure in the intake pipe; and

[0024] After receiving the EGR mixing system start-up command, when the temperature of the fresh gas is between the lower temperature limit and the upper temperature limit or 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 of the EGR circulation valve is adjusted based on the temperature deviation and the EGR flow rate.

[0025] In the EGR mixing system provided by at least one embodiment of the present disclosure, the diameter of the EGR mixing chamber is larger than the diameter of the fresh gas inlet, and in the intake direction of the fresh gas, the diameters of the pipes at different positions of the mixing shuttle first increase and then decrease.

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

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

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

[0029] In the EGR mixing system provided by at least one embodiment of the present disclosure, the diameters of the EGR area through-holes, the diameters of the intake area through-holes, and the diameters of the outlet area through-holes increase in sequence;

[0030] Among them, the diameter of the intake area through hole is configured to be related to the maximum EGR rate of the engine and the diameter of the EGR area through hole, and the diameter of the outlet area through hole is configured to be related to the diameter of the EGR area through hole and the diameter of the intake area through hole.

[0031] In the EGR mixing system provided by at least one embodiment of the present disclosure, the first EGR exhaust pipe and the second EGR exhaust pipe are both hollow circular pipes, and the outlet ends of the first EGR exhaust pipe and the second EGR exhaust pipe are both expanded.

[0032] At least one embodiment of the present disclosure further provides an engine, comprising the EGR mixing system provided in any embodiment of the present disclosure.

[0033] At least one embodiment of the present disclosure further provides a motor vehicle, comprising the EGR mixing system provided in any one of the embodiments of the present disclosure.

[0034] Compared with the related technologies, the EGR mixing system, engine and motor vehicle provided by the embodiments of the present disclosure have an EGR mixing chamber provided in the intake pipe, and a mixing shuttle provided in the EGR mixing chamber. During operation, the EGR exhaust gas and the fresh air are mixed in the mixing shuttle and discharged through the through holes in the air outlet area, so that the EGR exhaust gas has zero contact with the wall surface of the intake pipe, reducing the risk of wall icing, thereby ensuring stable operating performance of the engine with the EGR route when starting at low temperatures, and solving the technical problem of the related technologies in that the intake pipe is prone to icing in low temperature environments.

[0035] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0037] Figure 1 A schematic structural diagram of an EGR mixing system provided by at least one embodiment of the present disclosure;

[0038] Figure 2 A schematic diagram of an EGR mixing system provided by at least one embodiment of the present disclosure;

[0039] Figure 3 A schematic structural diagram of another EGR mixing system provided by at least one embodiment of the present disclosure;

[0040] Figure 4 A schematic structural diagram of another EGR mixing system provided by at least one embodiment of the present disclosure;

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

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

[0043] Figure 7 A schematic diagram of the appearance of an EGR exhaust pipe provided by at least one embodiment of the present disclosure;

[0044] Figure 8 A schematic cross-sectional view of an EGR exhaust pipe provided by at least one embodiment of the present disclosure;

[0045] Figure 9 A schematic structural diagram of an EGR mixing system example provided by at least one embodiment of the present disclosure;

[0046] Figure 10 A control diagram of an EGR mixing system control logic example provided by at least one embodiment of the present disclosure;

[0047] Figure 11 A structural block diagram of an engine provided by at least one embodiment of the present disclosure;

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

[0049] Reference numerals

[0050] 1-intake pipe; 2-first EGR exhaust pipe; 3-second EGR exhaust pipe; 4-EGR circulation valve; 11-fresh gas inlet; 12-mixed gas outlet; 13-EGR mixing chamber; 41-EGR circulation valve disc; 131-mixing shuttle;

[0051] 132-mixing shuttle support; 131a-intake zone through hole; 131b-EGR zone through hole; 131c-outlet zone through hole; zone a -Intake area structure; zone b -Outlet area structure; zone c -EGR area structure; 100-engine; 101-EGR mixing system; 200-motor vehicle. DETAILED DESCRIPTION

[0052] The present disclosure will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present disclosure and do not limit the scope of the present disclosure. Similarly, the following examples are only some embodiments of the present disclosure and not all embodiments. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present disclosure.

[0053] The terms "first," "second," and "third" in the embodiments of the present disclosure are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first," "second," and "third" may explicitly or implicitly include at least one of such features.

[0054] In the description of the present disclosure, “a plurality of” means at least two, such as two or three, etc., unless otherwise clearly and specifically defined.

[0055] In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0056] The terms "including" and "having," and any variations thereof, in the embodiments of the present disclosure are intended to cover non-exclusive inclusions. For example, a process, EGR mixing system, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to the process, EGR mixing system, product, or apparatus.

[0057] The term "engine controller" in the embodiments of the present disclosure, abbreviated as ECU, refers to an electronic controller with calculation and control functions applied to the 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", abbreviated as EGR, in the embodiments of the present disclosure refers to a technology that directs a portion of the engine's EGR exhaust gas back into the engine cylinder and mixes it with the fresh gas entering the engine to improve the engine's operating efficiency, improve the combustion environment, reduce engine load, reduce NOx compound emissions, reduce knock, and extend the service life of various components.

[0059] The term "EGR mixing system" in the embodiments of the present disclosure refers to a system that can evenly mix the fresh gas and EGR exhaust gas entering the engine, ensuring the uniformity of the introduction of EGR exhaust gas into each cylinder of the engine under various operating conditions.

[0060] The term "intake pipe" in the embodiment of the present disclosure refers to a part of the engine intake pipe located between the intercooler and the engine intake pipe, the purpose of which is to evenly mix the fresh air with the EGR exhaust gas through the EGR mixing system.

[0061] Related technologies have the risk of icing on the intake pipe in low-temperature environments. At this time, the intake flow area of ​​the engine is reduced, thereby affecting engine performance.

[0062] Figure 1 A schematic diagram of the structure of an EGR mixing system provided by 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] A fresh gas inlet 11 is provided at one end of the intake pipe 1 , a mixed gas outlet 12 is provided at the other end of the intake pipe 1 , and an EGR mixing chamber 13 is provided inside the intake pipe 1 .

[0064] The first EGR exhaust pipe 2 (also called the first EGR exhaust pipe) is communicated with one side of the EGR mixing chamber 13 .

[0065] The second EGR exhaust pipe 3 (also called the second EGR outlet pipe) is communicated with the other side of the EGR mixing chamber 13 .

[0066] Among them, a mixing shuttle 131 (referred to as the shuttle) is provided inside the EGR mixing chamber 13. The mixing shuttle 131 is provided between the outlet end of the first EGR exhaust pipe 2 and the outlet end of the second EGR exhaust pipe 3, and the mixing shuttle 131 is a hollow three-dimensional shuttle-shaped structure. In the intake direction of the fresh gas, the surface of the mixing shuttle 131 is sequentially provided with an intake area through hole 131a facing the fresh gas inlet 11, an EGR area through hole 131b facing the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3, and an outlet area through hole 131c facing the mixed gas outlet 12, so that the EGR exhaust gas (referred to as exhaust gas) entering through the EGR area through hole 131b and the fresh gas entering through the intake area through hole 131a form a mixed gas inside the mixing shuttle 131 and is discharged along the outlet area through hole 131c.

[0067] It should be noted that the position of the mixing shuttle 131 corresponds to the outlet of the first EGR exhaust pipe 2 and the outlet of the second EGR exhaust pipe 3, thereby isolating the EGR exhaust gas on both sides of the mixing shuttle 131. The embodiment of the present disclosure does not limit the direction of the intake pipe 1 and can be set according to actual needs.

[0068] In the above scheme, the external structure of the EGR mixing system is shown in Figure 2 Each intake pipe 1 needs to be equipped with two EGR outlet 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 Figure 5 After fresh gas (such as air and fuel gas) flows in from the fresh gas inlet 11, it is mixed with the EGR exhaust gas (referred to as exhaust gas) from the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 in the mixing shuttle 131, and flows out of the intake pipe 1 in the form of mixed gas, and enters the engine to participate in combustion.

[0069] The surface of mixing shuttle 131 is perforated to facilitate mixing and reduce intake resistance. After EGR exhaust gas flows from both sides of the EGR mixing chamber 13, it can flow into the interior of mixing shuttle 131 through the EGR area through-holes 131b. Fresh air can also flow into mixing shuttle 131, achieving mixing between the two. Furthermore, this drilling technique significantly reduces intake resistance caused by EGR exhaust gas flowing back along the surface of mixing shuttle 131 to the fresh air inlet 11, allowing EGR exhaust gas to be smoothly introduced into mixing shuttle 131.

[0070] During implementation, the EGR exhaust gas output by the engine can be effectively recirculated through the EGR mixing system. After mixing with fresh air in the EGR mixing chamber 13, the EGR exhaust gas re-enters the engine cylinder for combustion. During this process, the EGR mixing system not only ensures sufficient mixing of the EGR exhaust gas and the fresh air, but also, since the EGR exhaust gas enters from both sides of the EGR mixing chamber 13 and a mixing shuttle 131 is provided in the pipeline of the EGR mixing chamber 13, the EGR exhaust gas and the fresh air are mixed in the mixing shuttle 131. Under the impact of the fresh air, the EGR exhaust gas has zero contact with the wall surface of the intake pipe 1. This avoids the risk of water precipitation and ice formation in the intake pipe 1 due to the low wall temperature of the intake pipe 1 when the high-temperature EGR exhaust gas contacts the wall surface of the intake pipe 1 due to the low temperature of the engine in a low-temperature environment.

[0071] Some embodiments of the present disclosure also provide an engine and a motor vehicle corresponding to the above-mentioned EGR mixing system.

[0072] The EGR mixing system provided by at least one embodiment of the present disclosure is applicable to any existing engine application scenario with an EGR mixing system, and the embodiments of the present disclosure are not limited to this. For example, the EGR mixing system can be applied to a diesel engine, a gasoline engine, or a hybrid engine, and effectively improves the fuel economy and emission performance of the engine by precisely controlling the EGR flow. In addition, due to its compact structure and high mixing efficiency, the system is also applicable to various types of motor vehicles, including but not limited to cars, trucks, buses, and construction machinery, etc., providing a more environmentally friendly and efficient solution for the vehicle's power system. In actual applications, the EGR mixing system can not only meet strict emission regulations, but also extend the service life of the engine to a certain extent, reduce maintenance costs, and demonstrate broad application potential and market value.

[0073] Compared with the related art, the EGR mixing system proposed in the present disclosure improves the structure of the intake pipe 1, sets an EGR mixing chamber 13 in the intake pipe 1, and sets a mixing shuttle 131 in the EGR mixing chamber 13, so that during operation, the EGR exhaust gas and the fresh gas are mixed in the mixing shuttle 131 and discharged through the through hole 131c in the air outlet area, so that the EGR exhaust gas has zero contact with the wall surface of the intake pipe 1, reducing the risk of wall icing, and thus enabling the performance of the engine of the EGR route to be stable when started at low temperature, solving the technical problem of the related art that the intake pipe 1 is prone to icing risk in low temperature environment.

[0074] The main function of the intake pipe 1 is to introduce fresh air into the EGR mixing chamber 13, mix it with the EGR exhaust gas flowing in through the first and second EGR exhaust pipes 2 and 3, and then supply the mixed gas to the engine cylinders. The mixing shuttle 131 has a hollow interior and a three-dimensional spindle-shaped exterior. The outer surface of the mixing shuttle 131 is provided with through-holes with different functions in different directions. These through-holes include intake through-holes 131a, EGR through-holes 131b, and outlet through-holes 131c. The intake through-holes 131a allow fresh air to enter, the EGR through-holes 131b allow EGR exhaust gas to enter, and the outlet through-holes 131c allow the mixed gas to exit.

[0075] The primary function of the first EGR exhaust pipe 2 is to direct a portion of the EGR exhaust gas exhausted by the engine into the EGR mixing chamber 13. The first EGR exhaust pipe 2 is designed with a specific size and shape to ensure smooth and stable flow of the EGR exhaust gas while efficiently mixing with the fresh air introduced from the intake pipe 1 within the mixing shuttle 131.

[0076] The primary function of the second EGR exhaust pipe 3 is to direct 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 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 the 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 arranged symmetrically. This design allows for more uniform introduction of EGR exhaust gas, facilitating the formation of a more uniform mixed gas within the EGR mixing chamber 13. This not only improves the mixing efficiency of EGR exhaust gas and fresh air, but also enhances system stability and reliability. 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 prevent increased gas resistance during EGR exhaust gas discharge, 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 a key feature of the present disclosure. This design allows the EGR mixing chamber 13 to have an enlarged diameter. After the EGR exhaust gas flows into the intake pipe 1, the total gas flow rate within the intake pipe 1 is equal to the sum of the EGR exhaust gas and the fresh gas. This enlarged diameter structure effectively prevents increases in pipeline pressure caused by increased gas flow, thereby avoiding increased resistance during EGR exhaust gas discharge. This reduces pipeline pressure in the EGR mixing system, lowering both intake and total EGR mixing system resistance. Furthermore, because the mixing shuttle 131 housing is provided with an EGR zone through-hole 131b, EGR exhaust gas flowing into the mixing shuttle 131 does not flow along the surface of the mixing shuttle 131 in the opposite direction of the intake air flow, thereby reducing intake resistance.

[0079] Figure 3 A schematic diagram of another EGR mixing system provided by at least one embodiment of the present disclosure. Figure 3 As shown, in Figure 1 On the basis of the above, a mixing shuttle bracket 132 is further provided inside the EGR mixing chamber 13. The mixing shuttle bracket 132 is fixed to the inner wall of the EGR mixing chamber 13, and the mixing shuttle bracket 132 is used to install the mixing shuttle 131 in the middle position of the EGR mixing chamber 13. Among them, the mixing shuttle bracket 132 has structural stability and can withstand the dynamic pressure generated during the flow of the mixed gas, effectively avoiding the displacement or vibration of the mixing shuttle 131. In terms of material selection, the mixing shuttle bracket 132 should ensure its reliability and durability under extreme working conditions such as high temperature and high pressure. Through the provision of the mixing shuttle bracket 132, the overall performance of the EGR mixing system has been significantly enhanced, providing solid technical support for the stable and efficient operation of the engine.

[0080] Figure 4 A schematic diagram of the structure of another EGR mixing system provided by at least one embodiment of the present disclosure. Figure 4 As shown, in Figure 1On the basis of this, in order to optimize the engine performance, the EGR mixing system also includes an EGR circulation valve 4. The EGR circulation valve 4 is arranged in the first EGR exhaust pipe 2, and is used to control the on-off of the EGR exhaust gas flowing through the first EGR exhaust pipe 2. The EGR circulation valve 4 is configured as follows: when the EGR mixing system is cold-started, the EGR circulation valve 4 is set to a fully open state, so that the EGR exhaust gas passes through the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 at the same time to warm up the EGR mixing system, and after the EGR mixing system is started, the set opening of the EGR circulation 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 point of the present disclosure.

[0081] It should be noted that the EGR flow valve 4 may also be provided in the second EGR exhaust pipe 3. Furthermore, the EGR flow valve 4 may be adjusted manually or automatically, which is not limited in the embodiments of the present disclosure.

[0082] Among them, by adding an EGR circulation valve 4 to one of the EGR exhaust pipes, such as the first EGR exhaust pipe 2, the EGR pressure loss caused by the EGR exhaust gas being diverted to two EGR exhaust pipes when the engine is in a non-cold area (also called a non-low temperature environment) can be avoided, thereby improving the performance of the engine in a non-cold area and the emission stability. At the same time, in conjunction with the EGR flow adjustment strategy (the scheme in which the EGR circulation valve 4 is configured), the performance of the engine in various working conditions can be guaranteed. After the EGR mixing system is started, that is, when the engine is running, when the temperature deviation between the temperature of the fresh gas and the temperature of the mixed gas does not meet the set conditions, the opening of the EGR circulation valve 4 can be adjusted to reduce or increase the flow of the EGR exhaust gas, thereby effectively controlling the temperature of the mixed gas and ensuring that the engine operates in the best working state. In addition, the provision of the EGR circulation valve 4 enables the EGR mixing system to quickly adapt to different motor vehicle driving conditions, thereby improving engine efficiency. Figure 4 In the illustrated embodiment, the integrated design of the EGR circulation valve 4 and the first EGR exhaust pipe 2 not only simplifies the system structure but also effectively reduces manufacturing costs and maintenance. This design also facilitates the inspection and replacement of the EGR circulation valve 4, further improving the reliability and service life of the EGR mixing system.

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

[0084] Figure 6 A schematic diagram of the structure of a hybrid shuttle provided by at least one embodiment of the present disclosure. Figure 6 As shown, in Figure 1 On the basis of this, in order to achieve a good gas mixing effect, in the intake direction of the fresh gas, the pipe diameters at different positions of the mixing shuttle 131 tend to increase first and then decrease. This design is another important design point of the present disclosure.

[0085] As the fresh gas enters the mixing shuttle 131 where the pipe diameter increases, its velocity decreases. This allows for better mixing with the EGR exhaust gas entering through the EGR zone through-holes 131b. Part of the EGR exhaust gas mixes with the fresh gas within the mixing shuttle 131, improving mixing uniformity. Furthermore, this variation in pipe diameter helps reduce eddy currents and turbulence, thereby reducing energy losses and improving the overall efficiency of the EGR mixing system. In the reduced pipe diameter section, the gas is compressed, further enhancing mixing between the EGR exhaust gas and the fresh gas, ensuring uniform distribution of the EGR exhaust gas into the fresh gas. This not only optimizes mixing but also ensures the stability and reliability of the EGR mixing system under various operating conditions, thereby improving engine combustion efficiency and emissions performance.

[0086] like Figure 6 As shown, the mixing shuttle 131 includes an intake zone structure zone facing the fresh gas inlet 11. a (also called the front end or windward side), the wind outlet area structure zone facing the mixed gas outlet 12 b (also called the rear end or leeward side) and the EGR zone structure zone facing the first EGR exhaust pipe and the second EGR exhaust pipe c Intake area structure zone a The surface of the air inlet area is provided with a plurality of through holes 131a, and the air outlet area structure zone b The surface of the EGR zone is provided with a plurality of air outlet holes 131c. c The surface of the EGR zone is provided with multiple EGR zone through holes. c The pipe diameter is larger than the intake zone structure zone a Pipe diameter and air outlet zone structure b The diameter of the pipe. Among them, the air intake zone structure zone a Responsible for guiding the fresh air to smoothly enter the mixing shuttle 131, the air outlet zone structure zone b It is responsible for efficiently guiding the mixed gas out of the mixing shuttle. The moderate reduction of the pipe diameter helps to compress and accelerate the gas, so that the mixed gas can enter the engine's combustion chamber more effectively.c The pipe diameter is larger than the intake zone structure zone a Diameter and outlet zone structure b The large pipe diameter provides ample mixing space for EGR exhaust gas and fresh air, allowing them to fully blend and achieve optimal mixing. This design not only improves the uniformity of the mixed gas, but also effectively reduces energy loss, ensuring efficient operation of engines with EGR mixing structures.

[0087] like Figure 6 As shown, the intake area structure zone a and outlet zone structure zone b Each of these features a pointed structure, which promotes more efficient gas flow along the shuttle body surface and ensures smooth discharge of the mixed gas from the EGR mixing chamber 13. This pointed design not only reduces resistance to gas flow but also effectively prevents gas stagnation on the shuttle body surface, further improving mixing efficiency. The layout of the intake and outlet holes 131a and 131c ensures uniform and thorough mixing of fresh gas and EGR exhaust, enabling 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 EGR area through hole 131b is E , the diameter D of the air inlet area through hole 131a 进 and the diameter D of the outlet hole 131c 出 Increasing in sequence, that is, satisfying D 出 >D 进 >D E The diameter of the intake area through-hole 131a is configured to correlate with the engine's maximum EGR rate and the diameter of the EGR area through-hole 131b. The diameter of the outlet area through-hole 131c is configured to correlate with the diameters of the EGR area through-hole 131b and the intake area through-hole 131a. This diameter design further optimizes the gas flow path. The intake area through-hole 131a, serving as the channel for fresh gas to enter the mixing shuttle 131, has a larger diameter than the EGR area through-hole 131b. This facilitates the rapid influx of large amounts of fresh gas, providing a sufficient gas source for the subsequent mixing process. The maximized diameter of the outlet area through-hole 131c ensures that the mixed gas is discharged uniformly and smoothly. This structural design not only improves the quality of the mixed gas but also effectively avoids turbulence and stratification of the mixed gas during discharge, thereby further enhancing the engine's combustion efficiency and performance. In addition, by accurately 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 alternative, Figure 6 As shown, the length of the mixing shuttle 131 in the fresh gas intake direction is L, which is greater than the set length to ensure the mixing effect. a 、EGR zone structure zone c and outlet zone structure zone b The opening directions of each through-hole are aligned with the direction of gas transmission: the intake area through-holes 131a are oriented along the fresh air intake direction, the outlet area through-holes are oriented along the mixed gas exhaust direction, and the EGR area through-holes 131b are oriented along the EGR exhaust gas exhaust direction. This design not only ensures smooth gas flow but also effectively improves the overall efficiency of the EGR mixing system. The clear division between the intake, EGR, and outlet areas allows each to fully utilize its specific functions, working together to achieve optimal gas mixing. Furthermore, the long length L of the mixing shuttle 131 in the fresh air intake direction ensures ample time and space for the gases to mix thoroughly 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, effectively safeguarding the environmental performance of the vehicle.

[0090] As an optional embodiment, when the maximum EGR rate of the engine is E%, D 进 、D E and D 出 The relationship is as follows:

[0091]

[0092] D 出 =C(D 进 +D E ),

[0093] Where k is the first coefficient and C is the second coefficient.

[0094] Because only a portion of the fresh gas enters the mixing shuttle 131, while the majority of the EGR exhaust gas does, k is set in the range of 0.3 to 0.5. Since the gas mass increases after mixing with the EGR exhaust gas, the diameter of the outlet hole 131c is slightly larger than the diameter of the intake hole 131a, which can reduce pipeline resistance. C is set in the range of 1.1 to 1.2. This range ensures effective mixing of the gases within the mixing shuttle 131 while preventing the loss of gas flow efficiency due to excessive pipeline resistance. Furthermore, by precisely controlling the values ​​of k and C, the performance of the EGR mixing system can be further optimized, maintaining optimal operation under various operating conditions. This design not only improves engine fuel economy but also enhances the overall performance of the vehicle, providing a strong driving experience for the user.

[0095] In some embodiments, the outlet ends of the first and second EGR exhaust pipes 2 and 3 are both located near the mixing shuttle 131 but at a distance therefrom. This allows the EGR exhaust gas to directly contact the mixing shuttle 131, preventing contact with the cold intake pipe 1 wall, effectively preventing EGR line icing. Even in low-temperature environments, if ice forms at the head of the mixing shuttle 131 due to the low intake air temperature, the center of the mixing shuttle 131, with its enlarged diameter, does not affect fresh air intake from all sides, ensuring engine operation.

[0096] Figure 7 A schematic diagram of the appearance of an EGR exhaust pipe provided by at least one embodiment of the present disclosure. Figure 7 As shown, in Figure 1 On this basis, to further enhance gas mixing and flow efficiency, both the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 utilize hollow circular tubes of a predetermined diameter. Furthermore, the outlet ends of the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 each utilize a flared structure (also known as a flared umbrella-shaped structure). The flared structure is intended to better guide gas flow into the mixing shuttle 131. This design not only facilitates smoother entry of EGR exhaust gas into the mixing shuttle 131, but also achieves more efficient gas mixing.

[0097] Figure 8 A schematic cross-sectional view of an EGR exhaust pipe provided by at least one embodiment of the present disclosure. Figure 8 As shown, in the cutting direction indicated by the two A's in 7 of 7, the internal structure of the flared structure is displayed in detail. This design can improve the flow trajectory of the gas, reduce eddy currents and turbulence, ensure that the EGR exhaust gas can be mixed with the fresh gas more evenly and efficiently, and improve the mixing effect.

[0098] Figure 9 A schematic diagram of the structure of an EGR mixing system example provided by at least one embodiment of the present disclosure. Figure 9 As shown, the EGR circulation valve 4 includes an EGR circulation valve disc 41. The EGR circulation valve disc 41 is intended to precisely control the flow rate of EGR exhaust gas. The degree of opening and closing of the EGR circulation valve disc 41 can be flexibly adjusted by an electronic controller to adapt to the needs of the engine under different operating conditions. When the engine is in a low-load state, the EGR circulation valve disc 41 opens moderately, allowing an appropriate amount of EGR exhaust gas to flow back to the intake manifold to reduce the combustion temperature and reduce nitrogen oxide emissions. When the engine is under high load or requires high power output, the EGR circulation valve disc 41 is almost completely closed to ensure sufficient supply of fresh air to maintain efficient operation of the engine. In addition, the overall structure of the EGR circulation valve 4 is sturdy and durable, and can withstand the high temperature and high pressure environment when the engine is running, 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 disposed at the fresh gas inlet 11 and is used to obtain the temperature of the fresh gas. The second temperature sensor is disposed at the mixed gas outlet 12 and is used to obtain the temperature of the mixed gas. The provision of these two temperature sensors enables real-time monitoring of temperature changes of 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 optimizing engine performance and controlling emissions.

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

[0101] Step S11: After receiving the EGR mixing system start-up instruction, the temperature of the fresh gas is obtained, and when the temperature of the fresh gas is lower than the preset lower temperature limit, the first information for characterizing the cold start of the EGR mixing system is generated, and the EGR circulation valve 4 is controlled to be fully opened, so that the EGR exhaust gas enters the intake pipe 1 through the first EGR exhaust pipe 2 and the second EGR exhaust pipe 3 at the same time to achieve 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 called the EGR cold temperature) and the EGR flow formed by the flow of the first EGR exhaust pipe 2 and the flow of the second EGR exhaust pipe 3 are obtained, and the set opening of the EGR circulation valve 4 is dynamically adjusted based on the temperature deviation and the EGR flow.

[0103] In step S11, when the fresh air temperature is low, the EGR valve 4 is set to a fully open state (i.e., 100% opening), allowing EGR exhaust gas to 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 valve 4 based on the real-time temperature deviation and EGR flow rate to ensure that the opening of the EGR valve 4 meets both engine performance requirements and effectively prevents icing. During the engine warm-up phase, the fully open state of the EGR 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. In addition, this strategy comprehensively considers the changes in EGR flow rate under different operating conditions. By dynamically adjusting the opening of the EGR valve 4, the optimal mixing ratio of EGR exhaust gas and fresh air is achieved, further improving the engine's operating efficiency and emissions performance.

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

[0105] As an optional embodiment, if the temperature of the fresh gas, i.e., the first temperature, is lower than the preset lower temperature limit, the engine operates at the rated speed and maximum torque operating condition, and there will be EGR flow at this operating point. At this time, the controller controls the opening of the EGR circulation valve 4 to 100% through step S11. After the engine is started, the set opening of the EGR circulation valve 4 is dynamically adjusted based on the above-mentioned temperature deviation and EGR flow. In this way, the effective operation of the EGR system can be ensured even in extremely low temperature environments, avoiding system failure caused by icing. In addition, this embodiment also takes into account the needs of the engine under different operating conditions, especially under the rated speed and maximum torque operating condition, and further optimizes the engine performance by ensuring the existence of EGR flow. The controller dynamically adjusts the set opening of the EGR circulation valve 4 by monitoring the temperature deviation and EGR flow in real time, thereby achieving precise control of the mixing ratio of EGR exhaust gas and fresh gas, and enhancing its adaptability and stability under various operating conditions.

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

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

[0108] Step S21: After the EGR mixing system is started at room temperature, the water temperature of the engine is monitored.

[0109] Step S22: In response to the engine water temperature reaching the set temperature, second information is generated to indicate that the engine has entered a normal operating state, and the EGR circulation valve 4 is controlled 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 of the intake pipe 1.

[0110] Among them, in step S21, the controller obtains the operating status of the engine by monitoring the water temperature sensor of the engine cooling system. This step is key to ensuring that the engine reaches the appropriate operating temperature, because too low a water temperature may affect the engine's combustion efficiency and emission performance. When the water temperature gradually rises and reaches the preset set temperature, it indicates that the engine has completed preheating and can enter the normal operating state. 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 sign that the engine has entered the normal operating state. Subsequently, the controller will respond quickly and control the EGR circulation valve 4 to be fully closed. The purpose of this action is to increase the EGR exhaust gas pressure in the intake pipe 1, because under the normal operating state of the engine, the recirculation amount of EGR exhaust gas needs to be controlled more accurately to ensure the best combustion effect and emission control. By closing the EGR circulation valve 4, the pressure of the EGR exhaust gas can be increased, allowing the engine to more flexibly adjust the intake pressure according to the current operating requirements, thereby optimizing the overall performance.

[0111] As an optional implementation, during a normal temperature test, the engine operates at rated speed and maximum torque, at which point EGR flow occurs. When the engine water temperature reaches 90°C, the engine enters normal operation, and the opening of EGR valve 4 is set to 0%. Under this operating condition, EGR valve 4 is fully closed, ensuring that EGR exhaust gas does not enter the intake pipe 1 uncontrolled. This is crucial for maintaining engine stability and efficiency at rated speed and maximum torque.

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

[0113] Step S13: After receiving the EGR mixing system start-up instruction, when the temperature of the fresh gas is higher than the preset temperature upper limit and the EGR flow formed by the flow of the first EGR exhaust pipe 2 and the flow of the second EGR exhaust pipe 3 is lower than the EGR flow limit, the second information is output to characterize that there is no icing risk in the intake pipe 1 of the EGR mixing system, and the EGR circulation valve 4 is controlled 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-up instruction, when the temperature of the fresh gas is between the lower temperature limit and the upper temperature limit or the temperature of the fresh gas is higher than the upper temperature limit and the EGR flow (also called EGR flow) is higher than the EGR flow limit, the temperature deviation and EGR flow are obtained, and the set opening of the EGR circulation valve 4 is adjusted based on the temperature deviation and EGR flow.

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

[0116] As an optional embodiment, for example, when the engine is operating under a cyclic loading condition and the opening of EGR valve 4 is not zero, the EGR flow rate and the temperature deviation between the first and second temperature sensor data are measured. The opening of EGR valve 4 is then controlled based on the EGR flow rate and temperature deviation. When the opening of EGR valve 4 is adjusted to the appropriate position, the mixing effect of EGR exhaust gas and fresh air in 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. In this case, the opening of EGR valve 4 can be appropriately reduced to reduce the amount of EGR exhaust gas entering intake manifold 1, thereby preventing excessively high engine intake temperature from affecting combustion efficiency. On the contrary, if the EGR flow is small and the temperature deviation is large, it means that the temperature of the EGR exhaust gas is relatively low. At this time, the opening of the EGR circulation valve 4 should be appropriately increased to increase the amount of EGR exhaust gas entering the intake pipe 1, thereby improving the mixing uniformity of the EGR exhaust gas and the 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 rate limit in steps S13 and S14 is set to 20% to 30% of the engine's maximum EGR flow rate. During engine operation, if the EGR flow rate is too low, it may not meet the EGR mixing system's demand for EGR exhaust gas, thereby affecting the EGR effect. If the EGR flow rate is too high, it may lead to excessive EGR exhaust gas in the intake manifold 1, increasing the risk of icing and also detrimental to the engine's fuel economy and emissions performance. Therefore, setting the EGR flow rate limit to 20% to 30% of the engine's maximum EGR flow rate can ensure EGR effectiveness while taking into account engine stability and fuel economy. This setting range also has a certain degree of flexibility and can be fine-tuned according to different engine operating conditions and emission requirements to meet actual application needs.

[0118] Figure 10 A control diagram of an EGR mixing system control logic example provided by at least one embodiment of the present disclosure. Figure 10 As shown, the EGR mixing system control logic controls the opening of the EGR circulation valve based on the current fresh gas temperature, EGR flow rate, and mixed gas temperature. When the temperature of the fresh gas is lower than the lower temperature limit, the EGR circulation valve is set to fully open. At this time, the EGR exhaust gas enters the intake pipe from both sides at the same time, reducing the risk of freezing. When the temperature of the fresh gas is higher than the upper temperature limit and the current EGR flow rate is small, it is considered that there is no risk of freezing in the system, and the EGR circulation valve is set to fully closed. At this time, the EGR exhaust gas enters the intake pipe from one side. In addition to the above two cases, the required opening of the EGR circulation valve is determined by the current EGR flow rate and temperature deviation. The set opening of the EGR circulation valve is obtained by looking up the EGR circulation 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 by at least one embodiment of the present disclosure. Figure 11 As shown, the engine 100 includes the EGR mixing system 101 according to the above-mentioned embodiment.

[0120] Figure 12 A structural block diagram of a motor vehicle provided by at least one embodiment of the present disclosure. Figure 12 As shown, the motor vehicle 200 includes the EGR mixing system 101 according to the above-described embodiment.

[0121] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. An EGR mixing system, applied to an engine, characterized in that: include: An intake pipe, wherein one end of the intake pipe is provided with a fresh gas inlet, the other end of the intake pipe is provided with a mixed gas outlet, and an EGR mixing chamber is provided inside the intake pipe; a first EGR exhaust pipe, the first EGR exhaust pipe being in communication with one side of the EGR mixing chamber; and a second EGR exhaust pipe, the second EGR exhaust pipe being in communication with the other side of the EGR mixing chamber; In which, a mixing shuttle is provided inside the EGR mixing chamber, and the mixing shuttle is provided between the outlet end of the first EGR exhaust pipe and the outlet end of the second EGR exhaust pipe, and the mixing shuttle is a hollow three-dimensional shuttle-shaped structure. In the intake direction of the fresh gas, the shell surface of the mixing shuttle is sequentially provided with an intake area through-hole facing the fresh gas inlet, an EGR area through-hole facing the first EGR exhaust pipe and the second EGR exhaust pipe, and an outlet area through-hole facing the mixed gas outlet, so that the EGR exhaust gas entering through the EGR area through-hole and the fresh gas entering through the intake area through-hole form a mixed gas inside the mixing shuttle and are discharged along the outlet area through-hole.

2. The EGR mixing system according to claim 1, characterized in that Also includes: an EGR flow valve, the EGR flow valve being provided in the first EGR exhaust pipe and being used for controlling the on-off of the EGR exhaust gas flowing through the first EGR exhaust pipe; In which, the EGR circulation valve is configured as follows: when the EGR mixing system is cold-started, the EGR circulation valve is set to a fully open state so that the EGR exhaust gas passes through the first EGR exhaust pipe and the second EGR exhaust pipe at the same time to warm up the EGR mixing system, and after the EGR mixing system is started, the set opening of the EGR circulation valve is related to the temperature deviation between the temperature of the fresh gas and the temperature of the mixed gas.

3. The EGR mixing system according to claim 2, characterized in that: Also includes: a controller connected to the EGR flow valve; Wherein, the controller is configured as follows: After receiving the EGR mixing system start-up instruction, obtaining the temperature of the fresh gas, and when the temperature of the fresh gas is lower than a preset lower temperature limit, generating first information for indicating the cold start of the EGR mixing system, and controlling the EGR flow valve to fully open so that the EGR exhaust gas enters the intake pipe through the first EGR exhaust pipe and the second EGR exhaust pipe at the same time, thereby achieving 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 and the EGR flow formed by the flow of the first EGR exhaust pipe superimposed on the flow of the second EGR exhaust pipe are obtained, and the set opening of the EGR circulation valve is dynamically adjusted based on the temperature deviation and the EGR flow.

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

5. The EGR mixing system according to claim 3 or 4, characterized in that: The controller is further configured to: After receiving the EGR mixing system start-up instruction, when the temperature of the fresh gas is higher than a preset temperature upper limit and the EGR flow rate formed by the sum of the flow rate of the first EGR exhaust pipe and the flow rate of the second EGR exhaust pipe is lower than the EGR flow rate limit, outputting second information indicating that there is no icing risk in the intake pipe of the EGR mixing system, and controlling the EGR flow valve to be fully closed so that the EGR exhaust gas enters the intake pipe through the second EGR exhaust pipe to increase the EGR exhaust gas pressure in the intake pipe; and After receiving the EGR mixing system start-up command, when the temperature of the fresh gas is between the lower temperature limit and the upper temperature limit or 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 of the EGR circulation valve is adjusted based on the temperature deviation and the EGR flow rate.

6. The EGR mixing system according to any one of claims 1 to 4, characterized in that: The diameter of the EGR mixing chamber is larger than the diameter of the fresh gas inlet, and in the intake direction of the fresh gas, the diameters of the pipes at different positions of the mixing shuttle show a trend of first increasing and then decreasing; Among them, the air intake area structure of the mixing shuttle facing the fresh gas inlet and the air outlet area structure of the mixing shuttle facing the mixed gas outlet are both pointed structures, and the surface of the air intake area structure is provided with air intake area through holes, and the surface of the air outlet area structure is provided with air outlet area through holes.

7. The EGR mixing system according to any one of claims 1 to 4, characterized in that: The interior of the EGR mixing chamber is further provided with: A mixing shuttle bracket is fixed to the inner wall of the EGR mixing chamber, and is used to install the mixing shuttle in the middle position of the EGR mixing chamber.

8. The EGR mixing system according to any one of claims 1 to 4, characterized in that: The diameters of the through holes in the EGR area, the diameters of the through holes in the air intake area, and the diameters of the through holes in the air outlet area increase in sequence; Among them, the diameter of the intake area through hole is configured to be related to the maximum EGR rate of the engine and the diameter of the EGR area through hole, and the diameter of the outlet area through hole is configured to be related to the diameter of the EGR area through hole and the diameter of the intake area through hole.

9. The EGR mixing system according to any one of claims 1 to 4, characterized in that: The first EGR exhaust pipe and the second EGR exhaust pipe are both hollow circular pipes, and the outlet ends of the first EGR exhaust pipe and the outlet ends of the second EGR exhaust pipe are both expanded.

10. An engine, characterized in that: The engine comprises the EGR mixing system according to any one of claims 1 to 9.

11. A motor vehicle, characterized in that: The motor vehicle comprises the EGR mixing system according to any one of claims 1 to 9.

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