Engine air intake system and vehicle

Abstract

The present invention discloses an engine intake system and vehicle. The engine intake system includes a main pipe, an exhaust gas recirculation cooler, an intercooler, a valve group, two exhaust gas recirculation pipes, and two intercooler pipes. The main pipe includes a mixing pipe and an exhaust pipe, the mixing pipe being connected to the engine's air intake, and the exhaust pipe being connected to the engine's exhaust. Each exhaust gas recirculation pipe has two ends connected to the mixing pipe and the exhaust pipe, respectively. The exhaust gas recirculation cooler is provided in any exhaust gas recirculation pipe. One end of each intercooler pipe is connected to the mixing pipe. The intercooler is provided in any intercooler pipe. The valve group includes two sets of first opening valves and two sets of second opening valves, the two sets of first opening valves being provided in the two exhaust gas recirculation pipes, and the two sets of second opening valves being provided in the two intercooler pipes. This solution can optimize engine performance and flexibly adjust fresh air intake and exhaust gas treatment strategies according to different engine operating conditions and emission requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an engine air intake system and a vehicle. Background Art

[0002] The main function of the cooler of the EGR (exhaust gas recirculation) system is to reduce the temperature of the exhaust gas flowing back from the exhaust system to the intake system. Since the EGR rate under natural conditions is low and the exhaust temperature is relatively low, if the same cooling strategy as that under high-load conditions is adopted at this time, that is, all the exhaust gas in the EGR branch is allowed to flow through the EGR cooler for cooling, it may cause the exhaust gas to have an abnormally low temperature when it flows out of the EGR module. To this end, patent CN219654795U discloses an EGR module, an exhaust gas circulation system and a vehicle, which includes a cooler, a bypass pipe and a valve assembly. The valve assembly includes a valve body and a valve core. The valve body is provided with an air inlet. The valve core is arranged in the valve body and is movable between a first position and a second position. In the first position, the air inlet is connected to the cooler, and in the second position, the air inlet is connected to the bypass pipe. This can solve the problem of over-cooling the exhaust gas and generating coking when the EGR rate is low, which leads to blockage and aging of the cooler.

[0003] Furthermore, when the ambient temperature is low, if the supercharged air is still cooled by the intercooler, the intake air temperature may be too low, which will adversely affect engine performance. Excessively low intake air temperature will increase the engine's compression ratio, which may cause engine detonation or ignition difficulties.

[0004] Therefore, under low-load conditions in cold environments, it is necessary to adjust the cooling strategies of the EGR system and the intercooler system at the same time. There is an urgent need for an engine intake system that can adjust the EGR system and the intercooler system together to improve the performance of the engine in low-temperature environments. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose an engine intake system to solve the technical problem in the prior art that an engine intake system that can adjust the EGR system and the intercooler system together is urgently needed to improve the performance of the engine in a low temperature environment.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an engine intake system, comprising:

[0008] A main pipe, comprising a mixing pipe and an exhaust pipe, wherein the mixing pipe is used to connect to the air intake of the engine, and the exhaust pipe is used to connect to the exhaust port of the engine;

[0009] Two sets of exhaust gas recirculation pipes, with both ends of each exhaust gas recirculation pipe connected to the mixing pipe and the exhaust pipe respectively;

[0010] an exhaust gas recirculation cooler, provided in any of the exhaust gas recirculation pipelines;

[0011] Two groups of intercooler pipes, one end of each intercooler pipe is connected to the mixing pipe;

[0012] an intercooler, provided in any of the intercooling pipes; and

[0013] The valve group includes two groups of first opening valves and two groups of second opening valves. The two groups of the first opening valves are respectively arranged in the two groups of exhaust gas recirculation pipelines, and the two groups of the second opening valves are respectively arranged in the two groups of intercooler pipelines.

[0014] In some embodiments, one of the two groups of exhaust gas recirculation pipes is an exhaust gas main pipe, and the other group is an exhaust gas branch pipe, and the exhaust gas recirculation cooler is provided on the exhaust gas main pipe;

[0015] The engine intake system also includes a three-way butterfly valve, which includes a first butterfly valve and two second butterfly valves. The valve plate of the first butterfly valve and the valve plates of the two second butterfly valves are installed on the same rotating shaft, and have the same deflection on the rotating shaft as the valve plates of the adjacent second butterfly valves, and have a phase angle with the valve plates of the other second butterfly valves. The first butterfly valve constitutes the first opening valve located in the exhaust branch pipe, and the two second butterfly valves constitute the two second opening valves.

[0016] In some embodiments, the first opening valve provided on the exhaust main pipe is located at one end of the exhaust main pipe close to the mixing pipe, the exhaust branch pipe is connected to the exhaust main pipe, and the connection with the exhaust main pipe is located between the first opening valve and the exhaust gas recirculation cooler.

[0017] In some embodiments, the engine intake system further includes a drive motor, the drive motor being drivably connected to the rotating shaft for driving the rotating shaft to rotate; and / or,

[0018] The seat bodies of the first butterfly valve and the two second butterfly valves are integrally arranged to form a butterfly valve seat. The butterfly valve seat is provided with a cooling flow channel, and the cooling flow channel surrounds the channels of the first butterfly valve and the two second butterfly valves.

[0019] In some embodiments, the engine air intake system further includes an intercooler inlet pipe, an air filter and a supercharger, wherein the intercooler inlet pipe is respectively connected to the two groups of intercooler pipes, and the air filter and the compressor of the supercharger are arranged in the intercooler inlet pipe and are arranged in sequence in a direction away from the intercooler pipe.

[0020] In some embodiments, the intercooler input pipe is connected to the inlet ends of the two second opening valves respectively, one end of each intercooler pipe is connected to the outlet end of the corresponding second opening valve, and the other end is connected to the mixing pipe, and the intercooler is located between the corresponding second opening valve and the mixing pipe; or,

[0021] The intercooler input pipe is connected to the two intercooler pipes respectively, and one end of each intercooler pipe away from the intercooler input pipe is connected to the inlet end of the corresponding second opening valve. The mixing pipe is connected to the outlet ends of the two second opening valves respectively, and the intercooler is located between the corresponding second opening valve and the intercooler input pipe.

[0022] In some embodiments, the engine intake system further includes a throttle valve, which is disposed on the mixing tube and located between a connection between the mixing tube and the exhaust gas recirculation line and a connection between the mixing tube and the intercooler line.

[0023] In some embodiments, the exhaust pipe is further connected to the turbine of the supercharger.

[0024] In some embodiments, the engine air intake system further includes a mixer, which is disposed in the mixing tube and located at one end of the mixing tube close to the engine.

[0025] In a second aspect, the present invention further provides a vehicle comprising the engine intake system as described in any one of the above.

[0026] Compared to the prior art, the engine intake system provided by the present invention comprises two separate exhaust gas recirculation (EGR) and intercooler lines, one of which is equipped with an EGR cooler, and another with an intercooler. The gas flow in each line is flexibly adjusted via an opening valve, thereby integrating an EGR cooling circuit, an EGR bypass branch, an intercooler circuit, and an intercooler bypass branch. The exhaust gas ratio and temperature are circulated and adjusted through the EGR line, while the fresh air ratio and temperature are adjusted via the intercooler line to form a mixed gas in the mixing tube for delivery to the engine. This has the following beneficial effects: 1) Improving emission performance: By precisely controlling the exhaust gas mixing ratio and recirculation volume, NOx emissions are effectively reduced. 2) Optimizing engine performance: While maintaining low emissions, the engine's combustion process is optimized by adjusting the exhaust gas recirculation volume, improving fuel economy and power performance. During low engine load or cold start phases, when exhaust gas temperatures are low, this solution can reduce the proportion of low-temperature gas by increasing the bypass flow rate, preventing the cooling medium from remaining in the heat exchanger for extended periods. This reduces the risk of icing or freezing and protects component safety. Furthermore, by regulating the temperature of the mixed gas, it indirectly affects the temperature and heat capacity of the mixture entering the cylinder, helping to optimize the combustion process and improve the engine's fuel economy and emissions performance. 3) Enhanced System Flexibility: This technical solution allows for flexible adjustment of fresh air intake and exhaust gas treatment strategies based on the engine's varying operating conditions and emissions requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of a first embodiment of an engine intake system (an intercooler is located upstream of a three-way butterfly valve) provided by an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 A partial flow diagram of the engine intake system;

[0029] Figure 3 This is a flow chart of a second embodiment of an engine air intake system (the intercooler is located downstream of the three-way butterfly valve) provided by an embodiment of the present invention;

[0030] Figure 4 for Figure 3 Schematic diagram of the partial flow of the engine intake system.

[0031] Description of reference numerals:

[0032] 1. Mixing pipe; 2. Exhaust pipe; 3. Engine; 4. Exhaust gas recirculation line; 41. Exhaust main pipe; 42. Exhaust branch pipe; 43. EGR cooling circuit; 44. EGR cooling bypass branch; 5. Exhaust gas recirculation cooler; 6. Intercooler line; 61. Intercooler circuit; 62. Intercooler bypass branch; 7. Intercooler; 8. Three-way butterfly valve; 81. First opening valve; 82. Second opening valve; 83. First butterfly valve; 84. Second butterfly valve; 85. Rotating shaft; 86. EGR valve; 9. Intercooler inlet pipe; 10. Air filter; 20. Supercharger; 30. Throttle valve; 40. Mixer; 50. Control unit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] In order to solve the technical problem in the prior art that an engine intake system that can adjust the EGR system and the intercooler system together is urgently needed to improve the performance of the engine in a low-temperature environment, the present invention provides an engine intake system that can flexibly adjust the ratio of fresh air intake and exhaust gas and optimize engine performance.

[0035] It should be noted that the engine air intake system described in the present invention is used for but not limited to vehicles, etc. For the sake of convenience, in the present invention, only the application of the engine air intake system to vehicles, etc. is used as an example for explanation. The principles of the application of the engine air intake system to other types of equipment are essentially the same as those applied to vehicles, etc., and will not be repeated here.

[0036] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 Schematic diagram of the structure of the intake system of engine 3 in one embodiment of the present invention, the intake system of engine 3 includes a main pipe, an exhaust gas recirculation cooler 5, an intercooler 7, a valve group, two groups of exhaust gas recirculation pipes 4 and two groups of intercooler pipes 6; the main pipe includes a mixing pipe 1 and an exhaust pipe 2, the mixing pipe 1 is used to connect to the intake port of engine 3, and the exhaust pipe 2 is used to connect to the exhaust port of engine 3; the two ends of each exhaust gas recirculation pipe 4 are respectively connected to the mixing pipe 1 and the exhaust pipe 2; the exhaust gas recirculation cooler 5 is provided in any exhaust gas recirculation pipe 4; one end of each intercooler pipe 6 is connected to the mixing pipe 1; the intercooler 7 is provided in any intercooler pipe 6; the valve group includes two groups of first opening valves 81 and two groups of second opening valves 82, the two groups of first opening valves 81 are respectively provided in the two groups of exhaust gas recirculation pipes 4, and the two groups of second opening valves 82 are respectively provided in the two groups of intercooler pipes 6.

[0037] The intake system of the engine 3 provided by the present invention comprises two sets of exhaust gas recirculation (EGR) lines 4 and intercooler lines 6, respectively. An EGR cooler 5 is provided on one set of EGR lines 4, and an intercooler 7 is provided on the other set of intercooler lines 6. The gas flow rates of each line are flexibly adjusted via opening valves, thereby integrating an EGR cooling circuit 43, an EGR bypass branch 44, an intercooler circuit 61, and an intercooler bypass branch 62. Exhaust gas circulates and adjusts its ratio and temperature through the EGR line, while fresh air is delivered and adjusted through the intercooler line 6 to form a mixed gas in the mixing tube 1 for delivery to the engine 3. This has the following beneficial effects: 1) Improved emissions performance: By precisely controlling the exhaust gas mixing ratio and recirculation volume, NOx emissions are effectively reduced. 2) Optimized engine 3 performance: While maintaining low emissions, the combustion process of the engine 3 is optimized by adjusting the EGR volume, improving fuel economy and power performance. During low-load or cold-start phases of Engine 3, when exhaust gas temperatures are low, this solution increases the bypass flow rate, reducing the proportion of low-temperature gas and preventing the cooling medium from remaining in the heat exchanger for extended periods. This reduces the risk of icing or freezing and protects component safety. Furthermore, by regulating the temperature of the mixed gas, it indirectly affects the temperature and heat capacity of the mixture entering the cylinder, thereby helping to optimize the combustion process and improve Engine 3's fuel economy and emissions performance. 3) Enhanced System Flexibility: This technical solution allows for flexible adjustment of fresh air intake and exhaust gas treatment strategies based on the varying operating conditions and emissions requirements of Engine 3.

[0038] It should be noted that the above-mentioned EGR cooling circuit 43 refers to the exhaust gas recirculation pipeline 4 equipped with an exhaust gas recirculation cooler 5, while the other exhaust gas recirculation pipeline 4 is the EGR bypass branch 44; similarly, the intercooling circuit 61 refers to the intercooling pipeline 6 equipped with an intercooler 7, while the other intercooling pipeline 6 is the intercooling bypass circuit.

[0039] In one embodiment, one of the two groups of exhaust gas recirculation pipes 4 is an exhaust gas main pipe 41, and the other group is an exhaust gas branch pipe 42. The exhaust gas recirculation cooler 5 is arranged on the exhaust gas main pipe 41; the intake system of the engine 3 also includes a three-way butterfly valve 8, which includes a first butterfly valve 83 and two second butterfly valves 84. The valve plate of the first butterfly valve 83 and the valve plates of the two second butterfly valves 84 are installed on the same rotating shaft 85, and have the same deflection on the rotating shaft 85 as the valve plate of the adjacent second butterfly valve 84, and have a phase angle with the valve plate of the other second butterfly valve 84. In this embodiment, the first butterfly valve 83 constitutes a first opening valve 81 located in the exhaust gas branch pipe 42, and the two second butterfly valves 84 constitute two second opening valves 82.

[0040] In this embodiment, the first opening valve 81 on the EGR bypass branch 44 and the second opening valve 82 on the two intercooler lines 6 are integrated into a three-way butterfly valve 8. The valve plates of the three passages are mounted on the same rotating shaft 85 to synchronously adjust the opening of the valve plates of the three passages. It should be understood that the exhaust main pipe 41 constitutes the EGR cooling circuit 43, while the exhaust branch pipe 42 constitutes the EGR bypass branch 44. In this way, this solution allows a portion of the exhaust gas to be cooled by the EGR cooler before entering the mixing pipe 1, while the other portion bypasses the EGR cooler through the EGR bypass branch 44 and is mixed downstream of the EGR cooler by the three-way butterfly valve 8, thereby precisely controlling the temperature and flow of the exhaust gas entering the mixing pipe 1. Similarly, this solution allows a portion of the fresh air to be cooled by the intercooler 7 before entering the mixing tube 1, while the remaining portion bypasses the intercooler 7 through the intercooler bypass branch 62 and is mixed downstream of the intercooler 7 by the three-way butterfly valve 8. This allows for precise control of the temperature and flow of the gas entering the mixing tube 1. Through the combined action of these two measures, precise control of the overall intake temperature and flow of the engine 3 is achieved.

[0041] It should be noted that, from the perspective of engineering application, when the fluid temperature in one channel of the three-way butterfly valve 8 is significantly different from the fluid temperature in the other two channels, the gas flowing in the three channels of the three-way butterfly valve 8 should preferably be distributed in either hot, hot, cold, or cold, cold, hot, and it should be ensured that there is only one hot and cold interface.

[0042] To this end, in one embodiment, the EGR cooler and the intercooler 7 are Figure 1 and Figure 2 , and the first butterfly valve 83 and the two second butterfly valves 84 are arranged in sequence. At this time, the two butterfly valves on the left of the three-way butterfly valve 8 (i.e., the first butterfly valve and the second butterfly valve on the left) are filled with hot gas, while the rightmost butterfly valve (i.e., the second butterfly valve on the right) is filled with cooled gas, with a hot, hot, and cold distribution. There is only one hot and cold interface in the valve body, which is more reasonable.

[0043] It should be understood that if the intercooler 7 is placed on another intercooler pipeline 6, the three-way butterfly valve 8 will be hot, cold, and hot distributed, with two hot and cold interfaces, which will affect the thermal reliability of the valve body itself, and the heat transfer on both sides will have a greater impact on the cooled gas in the middle channel.

[0044] Specifically, in Figure 1 and Figure 2In the illustrated embodiment, a first butterfly valve 83 and two second butterfly valves 84 are arranged sequentially. Because the temperatures of the gases flowing through the first butterfly valve 83 and its adjacent second butterfly valves 84 are similar, the valve discs of the first butterfly valve 83 and its adjacent second butterfly valves 84 are aligned on the rotating shaft 85 and are simultaneously positioned 90° out of phase with the other second butterfly valves 84. That is, when the first butterfly valve 83 and its adjacent second butterfly valve 84 are fully closed, the other second butterfly valve 84 is fully open. This ensures that the valve discs in the two high-temperature channels of the three-way butterfly valve 8 are aligned and 90° out of phase with the valve disc in the low-temperature channel.

[0045] Furthermore, in another embodiment, the first butterfly valve 83 of the three-way butterfly valve 8 constitutes the first opening valve 81 located on the exhaust main pipe 41 (not shown in the corresponding figure). That is, in this embodiment, the EGR cooler is connected to the first butterfly valve 83 and is positioned upstream of the first butterfly valve 83. Simultaneously, the intercooler 7 is also positioned upstream of the three-way butterfly valve 8, and a second butterfly valve 84 connected to the intercooler 8 is positioned adjacent to the first butterfly valve 83, while another second butterfly valve 84 is positioned away from the first butterfly valve 83. In this case, the fluids flowing through the three channels of the three-way butterfly valve 8 are distributed as cold, hot, and cold, with only one hot-cold interface.

[0046] It should be noted that in the above-mentioned embodiment of the three-way butterfly valve 8 for conveying cold, hot and cold fluids, the valve plates of the first butterfly valve 83 and its adjacent second butterfly valve 84 still have the same deflection on the rotating shaft 85, and also have a phase difference of 90° with the other second butterfly valve 84.

[0047] In one embodiment, the first opening valve 81 provided on the exhaust gas main pipe 41 is located at one end of the exhaust gas main pipe 41 close to the mixing pipe 1 , and the exhaust gas branch pipe 42 is connected to the exhaust gas main pipe 41 , and the connection with the exhaust gas main pipe 41 is located between the first opening valve 81 and the exhaust gas recirculation cooler 5 .

[0048] In this embodiment, the first opening valve 81 on the exhaust main pipe 41 is defined as the EGR valve 86. Before passing through the EGR valve 86, a portion of the exhaust gas is cooled by the EGR cooler, while the remaining portion bypasses the EGR cooler (exhaust gas recirculation cooler 5) via the EGR bypass branch 44. The exhaust gas is then mixed downstream of the EGR cooler by the three-way butterfly valve 8 to precisely control the temperature and flow of the exhaust gas entering the mixing pipe 1. The connection between the outlet of the exhaust branch pipe 42 and the exhaust main pipe 41 is located between the EGR valve 86 and the EGR cooler.

[0049] In one embodiment, the intake system of the engine 3 also includes a drive motor, which is driven and connected to the rotating shaft 85 for driving the rotating shaft 85 to rotate; the seat bodies of the first butterfly valve 83 and the two second butterfly valves 84 are integrally arranged to form a butterfly valve seat, and the butterfly valve seat is provided with a cooling flow channel, which surrounds the channels of the first butterfly valve 83 and the two second butterfly valves 84.

[0050] In this embodiment, the three-way butterfly valve 8 comprises a butterfly valve seat, a rotating shaft 85, three valve discs, a drive motor, and a cooling water jacket disposed within the butterfly valve seat. The butterfly valve seat has three independent airflow channels, each corresponding to a valve disc. The valve discs are connected to the drive motor via the rotating shaft 85 for synchronous control.

[0051] It should be noted that in this solution, combining the above-mentioned opening valves into a three-way butterfly valve 8 has the following advantages: 1) Single drive shaft control: A single drive shaft is used to simultaneously control the opening and closing of the three valve plates, and it is driven by a single motor, which simplifies the structure, reduces costs, and improves reliability. 2) Cooling flow channel design: A cooling water jacket is provided in the butterfly valve seat, and the circulating cooling water is used to cool the high-temperature gas flowing through the valve body or to keep the low-temperature gas warm, thereby expanding the application range of the valve. 3) Flexible opening adjustment: Through the precise control of the drive motor, all valve plates can be adjusted to any opening between fully closed and fully open, including a half-open state, to meet the gas flow requirements under different working conditions. 4) Variable channel diameter: According to actual usage, channels of different diameters can be selected to optimize the gas flow resistance and improve the throttling efficiency.

[0052] In one embodiment, the air intake system of the engine 3 further includes an intercooler inlet pipe 9, an air filter 10, and a supercharger 20. The intercooler inlet pipe 9 is connected to the two sets of intercooler pipes 6 respectively. The compressors of the air filter 10 and the supercharger 20 are arranged on the intercooler inlet pipe 9 and are arranged in sequence in a direction away from the intercooler pipes 6.

[0053] In this embodiment, the fresh air after being pressurized by the supercharger 20 is divided into two paths at a specific position, one path entering the intercooler circuit 61, and the other path passing through the intercooler bypass branch 62. The supercharged gas entering the intercooler 7 undergoes heat exchange with the external environment through the cooling channel, and the temperature is significantly reduced. The cooled supercharged gas and the uncooled supercharged gas are mixed at the outlet of the three-way butterfly valve 8. The opening of the butterfly valve is adjusted according to the operating conditions of the engine 3 and the ambient temperature to optimize the mixing ratio. In this way, the supercharged mixture and the exhaust gas mixture after temperature adjustment through the three-way butterfly valve 8 can enter the mixing pipe 1 respectively, and finally enter the cylinder for combustion and work.

[0054] In one embodiment, see Figure 3 and Figure 4 The intercooler input pipe 9 is connected to the inlet ends of the two second opening valves 82 respectively, one end of each intercooler pipeline 6 is connected to the outlet end of the corresponding second opening valve 82, and the other end is connected to the mixing pipe 1. The intercooler 7 is located between the corresponding second opening valve 82 and the mixing pipe 1.

[0055] In this embodiment, the intercooler 7 is arranged downstream of the three-way butterfly valve 8, that is, the fresh air pressurized by the supercharger 20 is directly diverted to the intercooler circuit 61 and the intercooler bypass branch 62 through the three-way butterfly valve 8, and then mixed into the mixing pipe 1.

[0056] It should be noted that in Figure 3 and Figure 4 In the illustrated embodiment, when the intercooler 7 is located downstream of the three-way butterfly valve 8, the fluid flowing through the two second butterfly valves 84 is a hot fluid. Furthermore, because the EGR bypass branch 44 connects to the first butterfly valve 83 and lacks an EGR cooler, the gas flowing through the first butterfly valve 83 is also a hot fluid. In this case, the fluids in the three channels of the three-way butterfly valve 8 are distributed in a hot, hot, and hot manner, preventing adverse effects caused by different fluid temperatures in adjacent channels.

[0057] In another embodiment, see Figure 1 and Figure 2 The intercooler input pipe 9 is connected to the two intercooler pipes 6 respectively, and the end of each intercooler pipe 6 away from the intercooler input pipe 9 is connected to the inlet end of the corresponding second opening valve 82. The mixing pipe 1 is connected to the outlet end of the two second opening valves 82 respectively, and the intercooler 7 is located between the corresponding second opening valve 82 and the intercooler input pipe 9.

[0058] In this embodiment, the intercooler 7 is positioned upstream of the three-way butterfly valve 8. Fresh air, pressurized by the supercharger 20, is directly delivered from the intercooler inlet pipe 9 to the intercooler circuit 61 and the intercooler bypass branch 62, and then to the mixing pipe 1 via the three-way butterfly valve 8. This allows the position of the three-way butterfly valve 8 and the intercooler 7 to be flexibly adjusted according to actual conditions, improving assembly flexibility.

[0059] In one embodiment, the intake system of the engine 3 further includes a throttle valve 30 , which is disposed in the mixing pipe 1 and located between the connection between the mixing pipe 1 and the exhaust gas recirculation pipe 4 and the connection with the intercooler pipe 6 .

[0060] In this embodiment, a portion of the supercharged gas is allowed to pass through the intercooler 7 for cooling before passing through the throttle valve 30, while the other portion bypasses the intercooler 7 through the intercooler bypass branch 62 and is mixed through the three-way butterfly valve 8 downstream of the intercooler 7, so as to accurately control the temperature and flow rate of the supercharged gas entering the intake manifold.

[0061] In one embodiment, the exhaust pipe 2 is also connected to the turbine of the supercharger 20 .

[0062] In this embodiment, part of the exhaust gas is also transported to the supercharger 20 through a branch of the exhaust pipe 2 to provide power to the supercharger 20, thereby recycling the exhaust gas and improving the energy recovery rate.

[0063] In one embodiment, the intake system of the engine 3 further includes a mixer 40 . The mixer 40 is disposed in the mixing pipe 1 and is located at one end of the mixing pipe 1 close to the engine 3 .

[0064] In this embodiment, when the exhaust gas mixed through the two sets of EGR pipes and the fresh air mixed through the two sets of intercooler pipes 6 flow in the mixing pipe 1 to the mixer 40, they are mixed through the mixer 40, so that the exhaust gas and the fresh air are fully mixed before entering the engine 3, thereby improving combustion efficiency.

[0065] In addition, the present invention further provides a vehicle, comprising an engine 3 air intake system as described in any one of the above. It should be noted that the detailed structure of the vehicle's engine 3 air intake system can be referenced to the aforementioned embodiments of the engine 3 air intake system, and will not be further described here. Since the aforementioned engine 3 air intake system is used in the vehicle of the present invention, the embodiments of the vehicle of the present invention include all technical solutions of all the aforementioned embodiments of the engine 3 air intake system, and the technical effects achieved are also identical, and will not be further described here.

[0066] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the present invention is described in detail:

[0067] This program consists of the following parts:

[0068] 1) EGR cooler: Responsible for cooling part of the exhaust gas discharged from the engine 3, reducing its temperature to reduce the generation of nitrogen oxides (NOx).

[0069] 2) EGR bypass branch 44: provides a passage for uncooled exhaust gas to bypass the EGR cooler.

[0070] 3) Intercooler 7: Responsible for cooling the high-temperature and high-pressure gas from the supercharger 20, reducing its density and increasing the air intake of the engine 3.

[0071] 4) Intercooler bypass branch 62 : provides a passage for uncooled pressurized gas to bypass the intercooler 7 .

[0072] 5) Three-way butterfly valve 8: Installed downstream or upstream of the EGR cooler and intercooler 7, it is divided into two chambers: one for adjusting the mixing ratio of cooled and uncooled exhaust gas, and the other for adjusting the mixing ratio of cooled and uncooled boost gas. The degree of opening of the butterfly valve determines the mixing ratio of the hot and cold gases. Features of the three-way butterfly valve 8 include: the valve body is made of corrosion-resistant, high-temperature materials to withstand the high-temperature and high-pressure environments of exhaust and boost gas. The valve disc serves as a control element, rotating to change the opening of the channel, thereby regulating the exhaust gas flow. The valve disc edge is typically specially treated to reduce fluid resistance and improve sealing performance. A sealing ring or gasket is placed between the valve disc and the butterfly valve seat to effectively prevent exhaust gas leakage when closed. The butterfly valve actuator (e.g., electric, pneumatic, or hydraulic) receives signals from the engine control unit 50 (ECU) 50 to precisely control the rotation angle of the valve disc, achieving precise regulation of exhaust flow.

[0073] The workflow is as follows:

[0074] 1) Exhaust gas diversion: The exhaust gas discharged by the engine 3 is divided into two paths at a specific position, one path enters the EGR cooler, and the other path passes through the EGR bypass branch 44.

[0075] 2) Supercharged gas diversion: The gas pressurized by the supercharger 20 is divided into two paths at a specific position, one path enters the intercooler 7, and the other path passes through the intercooler bypass branch 62.

[0076] 3) Exhaust gas cooling: The exhaust gas entering the EGR cooler exchanges heat with the coolant through the cooling pipe, and the temperature is significantly reduced.

[0077] 4) Supercharged gas cooling: The supercharged gas entering the intercooler 7 exchanges heat with the external environment through the cooling channel, and the temperature is significantly reduced.

[0078] 5) Mixing of hot and cold exhaust gases: Cooled and uncooled exhaust gases mix at the outlet of three-way butterfly valve 8 downstream of the EGR cooler. The opening of first butterfly valve 83 is adjusted based on the operating conditions of engine 3 and emission requirements to optimize the mixing ratio.

[0079] 6) Mixing of hot and cold supercharged gas: The cooled supercharged gas and the uncooled supercharged gas are mixed at the outlet of the three-way butterfly valve 8. The opening of the second butterfly valve 84 is adjusted according to the operating conditions of the engine 3 and the ambient temperature to optimize the mixing ratio.

[0080] 7) Exhaust Gas Recirculation: The mixed exhaust gas enters mixing pipe 1 through EGR valve 86, mixes with fresh air, and then re-enters the combustion chamber of engine 3. The opening of EGR valve 86 is adjusted in real time by engine 3 control unit 50 (ECU) based on parameters such as engine 3 speed, load, and temperature to control the amount of exhaust gas recirculation.

[0081] 8) Engine 3 intake: The supercharged mixture and exhaust gas mixture, after temperature adjustment through the three-way butterfly valve 8, are respectively regulated in flow by the throttle 30 and the EGR valve 86, and then enter the mixing pipe 1, and finally enter the cylinder of the engine 3 for combustion and work.

[0082] This patented invention features a high level of integration. The design using the three-way butterfly valve 8 is often more compact, allowing for easier integration with other system components (such as the EGR cooler, EGR valve 86, and intercooler 7), significantly reducing the length and complexity of the bypass piping. This not only helps save valuable engine compartment space but also reduces the difficulty and cost of piping layout. This high level of integration not only reduces system complexity but also improves overall system reliability and maintainability. By tightly integrating the three-way butterfly valve 8 with the EGR cooler and intercooler 7 circuits, a fully functional, compact integrated module is formed. This modular design simplifies installation and improves overall system performance and reliability. It also facilitates subsequent maintenance and replacement, as the entire module can be disassembled and assembled as a single unit.

[0083] In addition, the three-way butterfly valve 8 has better flow regulation performance and can more accurately control the mixing ratio of hot and cold gases in different air chambers and the amount of exhaust gas recirculation. Simple structure, high reliability, and reduced cost: The design of one rotating shaft 85 controlling three valve plates greatly simplifies the structure, improves the reliability and stability of the system, and reduces manufacturing costs compared to the traditional method of independent control of multiple valve plates. Wide range of applications: The integrated cooling function enables the valve to handle high-temperature and low-temperature gases at the same time, broadening the scope of application. Low gas flow resistance: By adjusting the channel diameter and the valve plate opening, precise control of the gas flow resistance can be achieved, thereby improving the throttling efficiency.

[0084] This is crucial for optimizing engine 3 performance and reducing emissions. The exhaust gas in the EGR system is hot and may contain corrosive substances. The three-way butterfly valve 8 is typically made of high-temperature and corrosion-resistant materials to ensure long-term stable operation.

[0085] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An engine air intake system, characterized in that: include: A main pipe, comprising a mixing pipe and an exhaust pipe, wherein the mixing pipe is used to connect to the air intake of the engine, and the exhaust pipe is used to connect to the exhaust port of the engine; Two sets of exhaust gas recirculation pipes, with both ends of each exhaust gas recirculation pipe connected to the mixing pipe and the exhaust pipe respectively; an exhaust gas recirculation cooler, provided in any of the exhaust gas recirculation pipelines; Two groups of intercooler pipes, one end of each intercooler pipe is connected to the mixing pipe; an intercooler, provided in any of the intercooling pipes; and A valve group, comprising two groups of first opening valves and two groups of second opening valves, the two groups of the first opening valves being respectively provided in the two groups of exhaust gas recirculation pipes, and the two groups of the second opening valves being respectively provided in the two groups of intercooler pipes; Among them, one of the two groups of exhaust gas recirculation pipes is an exhaust gas main pipe, and the other group is an exhaust gas branch pipe, and the exhaust gas recirculation cooler is arranged on the exhaust gas main pipe; The engine intake system also includes a three-way butterfly valve, which includes a first butterfly valve and two second butterfly valves. The valve plate of the first butterfly valve and the valve plates of the two second butterfly valves are installed on the same rotating shaft, and have the same deflection on the rotating shaft as the valve plates of the adjacent second butterfly valves, and have a phase angle with the valve plates of the other second butterfly valves. The first butterfly valve constitutes the first opening valve located in the exhaust branch pipe, and the two second butterfly valves constitute the two second opening valves.

2. The engine intake system according to claim 1, characterized in that: The first opening valve provided on the exhaust main pipe is located at one end of the exhaust main pipe close to the mixing pipe. The exhaust branch pipe is connected to the exhaust main pipe, and the connection with the exhaust main pipe is located between the first opening valve and the exhaust gas recirculation cooler.

3. The engine intake system according to claim 1, characterized in that: The engine intake system further includes a drive motor, which is drivingly connected to the rotating shaft and is used to drive the rotating shaft to rotate; and / or, The seat bodies of the first butterfly valve and the two second butterfly valves are integrally arranged to form a butterfly valve seat. The butterfly valve seat is provided with a cooling flow channel, and the cooling flow channel surrounds the channels of the first butterfly valve and the two second butterfly valves.

4. The engine intake system according to claim 1, characterized in that: The engine air intake system also includes an intercooler inlet pipe, an air filter and a supercharger. The intercooler inlet pipe is connected to the two groups of intercooler pipes respectively. The air filter and the compressor of the supercharger are arranged on the intercooler inlet pipe and are arranged in sequence in a direction away from the intercooler pipe.

5. The engine air intake system according to claim 4, characterized in that: The intercooler input pipe is connected to the inlet ends of the two second opening valves respectively, one end of each intercooler pipeline is connected to the outlet end of the corresponding second opening valve, and the other end is connected to the mixing pipe, and the intercooler is located between the corresponding second opening valve and the mixing pipe; or, The intercooler input pipe is connected to the two intercooler pipes respectively, and one end of each intercooler pipe away from the intercooler input pipe is connected to the inlet end of the corresponding second opening valve. The mixing pipe is connected to the outlet ends of the two second opening valves respectively, and the intercooler is located between the corresponding second opening valve and the intercooler input pipe.

6. The engine air intake system according to claim 5, characterized in that: The engine air intake system further comprises a throttle valve, which is arranged on the mixing pipe and located between the connection between the mixing pipe and the exhaust gas recirculation pipeline and the connection between the mixing pipe and the intercooling pipeline.

7. The engine air intake system according to claim 4, characterized in that: The exhaust pipe is also connected to the turbine of the supercharger.

8. The engine air intake system according to claim 1, characterized in that: The engine air intake system further includes a mixer, which is provided in the mixing pipe and located at one end of the mixing pipe close to the engine.

9. A vehicle, characterized in that: The invention comprises an engine air intake system according to any one of claims 1 to 8.

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