Engine air inlet system and vehicle

Abstract

The invention discloses an engine air inlet system and a vehicle. The engine air inlet system comprises a main pipe, an exhaust gas recirculation cooler, an intercooler, a valve set, two sets of exhaust gas recirculation pipelines and two sets of intercooling pipelines. The main pipe comprises a mixing pipe and a waste gas pipe, the mixing pipe communicates with an air inlet of the engine, and the waste gas pipe communicates with a waste gas opening of the engine; two ends of each exhaust gas recirculation pipeline are respectively communicated with the mixing pipe and the exhaust gas pipe; the exhaust gas recirculation cooler is arranged on any exhaust gas recirculation pipeline; one end of each intercooling pipeline is communicated with the mixing pipe; the intercooler is arranged on any intercooling pipeline; the valve group comprises two groups of first opening valves and two groups of second opening valves, the two groups of first opening valves are respectively arranged on the two groups of exhaust gas recirculation pipelines, and the two groups of second opening valves are respectively arranged on the two groups of intercooling pipelines. According to the scheme, the performance of the engine can be optimized, and the treatment strategy of fresh air inlet and waste gas can be flexibly adjusted according to different working conditions and emission requirements of the engine.

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 the high-load condition 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 temperature of the exhaust gas to be abnormally low 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 excessive cooling of the exhaust gas and coking at low EGR rates, which leads to blockage and aging of the cooler.

[0003] In addition, 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 have an adverse effect on engine performance. Too low intake air temperature will increase the compression ratio of the engine, which may cause engine knock or ignition difficulty.

[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 adjusts 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: In a first aspect, the present invention provides an engine intake system, comprising: A main pipe, including a mixing pipe and an exhaust pipe, wherein the mixing pipe is used to connect to an air inlet of an engine, and the exhaust pipe is used to connect to an exhaust port of the engine; Two groups of exhaust gas recirculation pipelines, two ends of each exhaust gas recirculation pipeline are 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 pipelines, one end of each of the intercooler pipelines is connected to the mixing pipe; An intercooler, provided in any of the intercooling pipelines; and 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.

[0007] 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 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 two second opening valves.

[0008] 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.

[0009] In some embodiments, 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.

[0010] In some embodiments, the engine air intake system also includes an intercooler input pipe, an air filter and a supercharger, the intercooler input pipe is respectively connected to the two groups of intercooler pipes, the air filter and the compressor of the supercharger are arranged in the intercooler input pipe, and are arranged in sequence in a direction away from the intercooler pipe.

[0011] 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, The intercooler input pipe is connected to the two intercooler pipelines respectively, one end of each intercooler pipeline 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.

[0012] In some embodiments, the engine intake system further includes a throttle valve, which is disposed on the mixing pipe and located between the throttle valve and a connection with the exhaust gas recirculation pipeline and a connection with the intercooler pipeline.

[0013] In some embodiments, the exhaust pipe is also connected to the turbine of the supercharger.

[0014] In some embodiments, the engine 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.

[0015] In a second aspect, the present invention further provides a vehicle, comprising an engine intake system as described in any one of the above.

[0016] Compared with the prior art, the engine intake system provided by the present invention is provided with two groups of exhaust gas recirculation pipelines and intercooler pipelines, and an exhaust gas recirculation cooler is provided on one group of exhaust gas recirculation pipelines, and an intercooler is provided on one group of intercooler pipelines. At the same time, the gas flow of each pipeline is flexibly adjusted through the opening valve, so that the EGR cooling circuit, EGR bypass branch, intercooler circuit and intercooler bypass branch are integrated, and the exhaust gas ratio and temperature are circulated and adjusted through the EGR pipeline, and the fresh air ratio and temperature are transported and adjusted through the intercooler pipeline to form a mixed gas in the mixing tube and transported to the engine. This has the following beneficial effects: 1) Improve emission performance: By accurately controlling the mixing ratio and recirculation amount of the exhaust gas, NOx emissions are effectively reduced. 2) Optimize engine performance: While maintaining low emissions, by adjusting the exhaust gas recirculation amount, the combustion process of the engine is optimized to improve fuel economy and power performance. During the low-load or cold-start phase of the engine, when the exhaust gas temperature is low, this solution can reduce the proportion of low-temperature gas by increasing the flow of the bypass branch, avoiding the cooling medium from staying in the heat exchanger for a long time, thereby reducing the risk of icing or freezing and protecting the safety of components. In addition, by adjusting the temperature of the mixed gas, it also indirectly affects the temperature and heat capacity of the mixed gas entering the cylinder, which helps to optimize the combustion process and improve the fuel economy and emission performance of the engine. 3) Enhanced system flexibility: This technical solution allows for flexible adjustment of fresh air intake and exhaust gas treatment strategies according to different engine operating conditions and emission requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic flow chart of a first embodiment of an engine air intake system provided by an embodiment of the present invention (the intercooler is located upstream of the three-way butterfly valve); Figure 2 yes Figure 1 A partial flow diagram of the engine intake system; Figure 3 It is a flow chart of a second embodiment of the engine air intake system provided by an embodiment of the present invention (the intercooler is located downstream of the three-way butterfly valve); Figure 4 for Figure 3 Schematic diagram of the partial flow of the engine intake system.

[0018] Description of reference numerals: 1. Mixing pipe; 2. Exhaust pipe; 3. Engine; 4. Exhaust gas recirculation pipeline; 41. Exhaust main pipe; 42. Exhaust branch pipe; 43. ERG cooling circuit; 44. EGR cooling bypass branch; 5. Exhaust gas recirculation cooler; 6. Intercooler pipeline; 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 input pipe; 10. Air filter; 20. Supercharger; 30. Throttle valve; 40. Mixer; 50. Control unit. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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.

[0020] In order to solve the technical problem in the prior art that an engine intake system that can adjust an EGR system and an 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.

[0021] 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 of explanation, in the present invention, only the application of the engine air intake system to vehicles, etc. is used as an example for explanation, and 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.

[0022] See also Figure 1 and Figure 2 , Figure 1 and Figure 21 is a schematic diagram of the structure of the intake system of the engine 3 in one embodiment of the present invention, wherein the intake system of the engine 3 comprises a main pipe, an exhaust gas recirculation cooler 5, an intercooler 7, a valve group, two groups of exhaust gas recirculation pipelines 4 and two groups of intercooler pipelines 6; the main pipe comprises a mixing pipe 1 and an exhaust pipe 2, the mixing pipe 1 is used to connect to the intake port of the engine 3, and the exhaust pipe 2 is used to connect to the exhaust port of the engine 3; both ends of each exhaust gas recirculation pipeline 4 are respectively connected to the mixing pipe 1 and the exhaust pipe 2; the exhaust gas recirculation cooler 5 is arranged on any exhaust gas recirculation pipeline 4; one end of each intercooler pipeline 6 is connected to the mixing pipe 1; the intercooler 7 is arranged on any intercooler pipeline 6; the valve group comprises 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 arranged on the two groups of exhaust gas recirculation pipelines 4, and the two groups of second opening valves 82 are respectively arranged on the two groups of intercooler pipelines 6.

[0023] In the intake system of the engine 3 provided by the present invention, two groups of exhaust gas recirculation pipelines 4 and intercooler pipelines 6 are respectively provided, and an exhaust gas recirculation cooler 5 is provided on one group of exhaust gas recirculation pipelines 4, and an intercooler 7 is provided on one group of intercooler pipelines 6. At the same time, the gas flow of each pipeline is flexibly adjusted by the opening valve, so that the EGR cooling circuit 43, the EGR bypass branch 44, the intercooler circuit 61 and the intercooler bypass branch 62 are integrated, and the exhaust gas ratio and temperature are circulated and adjusted through the EGR pipeline, and the fresh air ratio and temperature are transported and adjusted through the intercooler pipeline 6 to form a mixed gas in the mixing tube 1 and transported to the engine 3. This has the following beneficial effects: 1) Improve emission performance: By accurately controlling the mixing ratio and recirculation amount of the exhaust gas, the emission of NOx is effectively reduced. 2) Optimize the performance of the engine 3: While maintaining low emissions, by adjusting the exhaust gas recirculation amount, the combustion process of the engine 3 is optimized to improve fuel economy and power performance. During the low load or cold start phase of the engine 3, when the exhaust gas temperature is low, this solution can reduce the proportion of low-temperature gas by increasing the flow of the bypass branch, avoiding the cooling medium from staying in the heat exchanger for a long time, thereby reducing the risk of icing or freezing and protecting the safety of components. In addition, by adjusting the temperature of the mixed gas, it also indirectly affects the temperature and heat capacity of the mixed gas entering the cylinder, which helps to optimize the combustion process and improve the fuel economy and emission performance of the engine 3. 3) Enhanced system flexibility: This technical solution allows flexible adjustment of the fresh air intake and exhaust gas treatment strategies according to the different operating conditions and emission requirements of the engine 3.

[0024] 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, and the other exhaust gas recirculation pipeline 4 is the EGR bypass branch 44; similarly, the intercooler circuit 61 refers to the intercooler pipeline 6 equipped with an intercooler 7, and the other intercooler pipeline 6 is the intercooler bypass circuit.

[0025] In one embodiment, one of the two groups of exhaust gas recirculation pipelines 4 is an exhaust gas main pipe 41, and the other group is an exhaust gas branch pipe 42, and the exhaust gas recirculation cooler 5 is arranged on the exhaust gas main pipe 41; the engine 3 intake system also includes a three-way butterfly valve 8, the three-way butterfly valve 8 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, and 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.

[0026] In this embodiment, the first opening valve 81 on the EGR bypass branch 44 and the second opening valve 82 on the two sets of intercooler pipes 6 are integrated into the form of a three-way butterfly valve 8, and the valve plates of the three passages are installed on the same rotating shaft 85 to synchronously adjust the openings of the valve plates of the three passages. It should be understood that the above-mentioned exhaust main pipe 41 constitutes the EGR cooling circuit 43, and the exhaust branch pipe 42 constitutes the EGR bypass branch 44. In this way, this scheme allows a part of the exhaust gas to be cooled by the EGR cooler before entering the mixing pipe 1, while the other part bypasses the EGR cooler through the EGR bypass branch 44 and is mixed by the three-way butterfly valve 8 downstream of the EGR cooler to accurately control the temperature and flow of the exhaust gas entering the mixing pipe 1. Similarly, this solution allows a portion of the fresh gas to be cooled by the intercooler 7 before entering the mixing tube 1, while the other portion bypasses the intercooler 7 through the intercooler bypass branch 62 and is mixed by the three-way butterfly valve 8 downstream of the intercooler 7, so as to accurately control the temperature and flow of the gas entering the mixing tube 1. Through the combined effect of the above two, the overall intake temperature and flow of the engine 3 can be accurately controlled.

[0027] 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 a hot, hot, and cold manner, or in a cold, cold, and hot manner, and it should be ensured that there is only one hot and cold interface.

[0028] To this end, in one embodiment, the EGR cooler and the intercooler 7 are Figure 1 and Figure 2 The arrangement is shown in , 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 gas with a relatively high temperature, while the butterfly valve on the far right (i.e., the second butterfly valve on the right) is filled with cooled gas, which is distributed in hot, hot, and cold forms. There is only one hot and cold interface in the valve body, which is more reasonable.

[0029] 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.

[0030] Specifically, in Figure 1 and Figure 2 In the embodiment shown, the first butterfly valve 83 and the two second butterfly valves 84 are arranged in sequence. Since the temperatures of the gases flowing through the first butterfly valve 83 and the second butterfly valves 84 adjacent thereto are similar, the valve plates of the first butterfly valve 83 and the second butterfly valves 84 adjacent thereto are arranged in the same direction on the rotating shaft 85, and at the same time, they are arranged with a phase difference of 90° with the other second butterfly valve 84. That is, when the first butterfly valve 83 and the second butterfly valve 84 adjacent thereto are fully closed, the other second butterfly valve 84 is fully opened. This ensures that the valve plates in the two high-temperature channels of the three-way butterfly valve 8 are in the same position, and have a phase difference of 90° with the valve plates in the low-temperature channel.

[0031] In addition, in another embodiment, the first butterfly valve 83 of the three-way butterfly valve 8 constitutes a first opening valve 81 (not shown in the corresponding figure) located on the exhaust gas main pipe 41, that is, in this embodiment, the EGR cooler is connected to the first butterfly valve 83, and the EGR cooler is arranged upstream of the first butterfly valve 83. At the same time, the intercooler 7 is also placed upstream of the three-way butterfly valve 8, and the second butterfly valve 84 connected to the intercooler 8 is arranged adjacent to the first butterfly valve 83, and the other second butterfly valve 84 is far away from the first butterfly valve 83. At this time, the fluids flowing through the three channels of the three-way butterfly valve 8 are distributed in cold, cold and hot, and there is only one cold and hot interface.

[0032] It should be noted that in the above-mentioned embodiments 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.

[0033] 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, 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.

[0034] In this embodiment, the first opening valve 81 on the exhaust main pipe 41 is defined as an EGR valve 86. Before the exhaust gas passes through the EGR valve 86, a part of the exhaust gas is cooled by the EGR cooler, while the other part bypasses the EGR cooler (exhaust gas recirculation cooler 5) through the EGR bypass branch 44 and is mixed by the three-way butterfly valve 8 downstream of the EGR cooler to accurately control the temperature and flow of the exhaust gas entering the mixing pipe 1. The connection point between the outlet end of the exhaust branch pipe 42 and the exhaust main pipe 41 is located between the EGR valve 86 and the EGR cooler.

[0035] In one embodiment, the intake system of the engine 3 also includes a drive motor, which is drivably connected to the rotating shaft 85 and is used to drive 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.

[0036] In this embodiment, the three-way butterfly valve 8 includes a butterfly valve seat, a rotating shaft 85, three valve plates, a driving motor and a cooling water jacket arranged in the butterfly valve seat. The butterfly valve seat is provided with three independent air flow channels, each channel corresponds to a valve plate, and the valve plate is connected to the driving motor through the rotating shaft 85 to achieve synchronous control.

[0037] It should be noted that in this solution, the combination of the above-mentioned opening valves into a three-way butterfly valve 8 has the following advantages: 1) Single drive shaft control: One drive shaft is used to simultaneously control the opening and closing of three valve plates, and it is driven by a single motor, which simplifies the structure, reduces costs, and improves reliability. 2) Cooling channel design: A cooling water jacket is provided in the butterfly valve seat, and the high-temperature gas flowing through the valve body is cooled or the low-temperature gas is kept warm by circulating cooling water, which expands 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 from fully closed to fully open, including 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 gas flow resistance and improve throttling efficiency.

[0038] In one embodiment, the intake system of the engine 3 further includes an intercooler input pipe 9, an air filter 10 and a supercharger 20. The intercooler input pipe 9 is connected to two sets of intercooler pipes 6 respectively. The compressors of the air filter 10 and the supercharger 20 are arranged on the intercooler input pipe 9 and are arranged in sequence in a direction away from the intercooler pipe.

[0039] In this embodiment, the fresh air after being pressurized by the supercharger 20 is divided into two paths at a specific position, one path enters the intercooler circuit 61, and the other path passes through the intercooler bypass branch 62. The supercharged gas entering the intercooler 7 exchanges heat 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 mixed gas and the exhaust gas mixed gas 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.

[0040] 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 pipe 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.

[0041] 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.

[0042] It should be noted that in Figure 3 and Figure 4 In the embodiment shown, when the intercooler 7 is located downstream of the three-way butterfly valve 8, the fluids flowing through the two second butterfly valves 84 are all hot fluids. At the same time, since the EGR bypass branch 44 is connected to the first butterfly valve 83 and no EGR cooler is provided thereon, the gas flowing through the first butterfly valve 83 is also a hot fluid. At this time, the fluids in the three channels of the three-way butterfly valve 8 are distributed in a hot, hot, and hot manner, avoiding adverse effects caused by different fluid temperatures in adjacent channels.

[0043] In another embodiment, see Figure 1 and Figure 2 The intercooler input pipe 9 is connected to the two intercooler pipes 6 respectively, one 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 ends 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.

[0044] In this embodiment, the intercooler 7 is arranged upstream of the three-way butterfly valve 8. At this time, the fresh air pressurized by the supercharger 20 is directly delivered from the intercooler input pipe 9 to the intercooler circuit 61 and the intercooler bypass branch 62, and then delivered to the mixing pipe 1 through the three-way butterfly valve 8. In this way, the positions of the three-way butterfly valve 8 and the intercooler 7 can be flexibly adjusted according to actual conditions, thereby improving assembly flexibility.

[0045] In one embodiment, the air 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 between the intercooler pipe 6 .

[0046] In this embodiment, a portion of the supercharged gas is allowed to be cooled through the intercooler 7 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.

[0047] In one embodiment, the exhaust pipe 2 is also connected to a turbine of a supercharger 20 .

[0048] In this embodiment, part of the exhaust gas is also transported to the supercharger 20 through the branch of the exhaust pipe 2 to provide power to the supercharger 20, thereby realizing the recycling of the exhaust gas and improving the energy recovery rate.

[0049] In one embodiment, the air 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 .

[0050] 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 the combustion efficiency.

[0051] In addition, the present invention also provides a vehicle, the vehicle includes the engine 3 intake system as described in any one of the above. It should be noted that the detailed structure of the vehicle's engine 3 intake system can refer to the above-mentioned engine 3 intake system embodiment, which will not be repeated here; since the above-mentioned engine 3 intake system is used in the vehicle of the present invention, the embodiment of the vehicle of the present invention includes all technical solutions of all embodiments of the above-mentioned engine 3 intake system, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0052] 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: This program consists of the following parts: 1) EGR cooler: responsible for cooling part of the exhaust gas discharged from the engine 3, lowering its temperature to reduce the generation of nitrogen oxides (NOx).

[0053] 2) EGR bypass branch 44: provides a passage for uncooled exhaust gas to bypass the EGR cooler.

[0054] 3) Intercooler 7: responsible for cooling the high-temperature and high-pressure gas from the supercharger 20, reducing its density and increasing the intake volume of the engine 3.

[0055] 4) Intercooler bypass branch 62 : provides a passage for uncooled pressurized gas to bypass the intercooler 7 .

[0056] 5) Three-way butterfly valve 8: Installed downstream or upstream of the EGR cooler and intercooler 7, it is divided into two air chambers on the left and right, one side is used to adjust the mixing ratio of cooled exhaust gas and uncooled exhaust gas, and the other side is used to adjust the mixing ratio of cooled boost gas and uncooled boost gas. The degree of opening of the butterfly valve determines the mixing ratio of hot and cold gases. The characteristics of the three-way butterfly valve 8 include: the valve body is made of corrosion-resistant and high-temperature resistant materials to withstand the high temperature and high pressure environment of the exhaust gas and boost gas. The valve plate is used as a control element to change the opening of the channel by rotation, thereby adjusting the flow of the exhaust gas. The edge of the valve plate is usually specially treated to reduce fluid resistance and improve sealing performance. A sealing ring or sealing gasket is arranged between the valve plate and the butterfly valve seat to ensure that the exhaust gas leakage can be effectively prevented in the closed state. The actuator of the butterfly valve (such as electric, pneumatic or hydraulic drive) receives a signal from the engine 3 control unit 50 (ECU) 50, accurately controls the rotation angle of the valve plate, and realizes accurate adjustment of the exhaust gas flow rate.

[0057] The workflow is as follows: 1) Exhaust gas diversion: The exhaust gas discharged from 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.

[0058] 2) Supercharged gas diversion: The gas supercharged 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.

[0059] 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.

[0060] 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.

[0061] 5) Mixing of hot and cold exhaust gas: The cooled exhaust gas and the uncooled exhaust gas are mixed at the outlet of the three-way butterfly valve 8 downstream of the EGR cooler. The opening of the first butterfly valve 83 is adjusted according to the operating conditions of the engine 3 and the emission requirements to optimize the mixing ratio.

[0062] 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 working condition of the engine 3 and the ambient temperature to optimize the mixing ratio.

[0063] 7) Exhaust gas recirculation: The mixed exhaust gas enters the mixing pipe 1 through the EGR valve 86, and then enters the combustion chamber of the engine 3 again after mixing with the fresh air. The opening of the EGR valve 86 is adjusted in real time by the engine 3 control unit 50 (ECU) according to parameters such as the engine 3 speed, load, and temperature to control the recirculation amount of the exhaust gas.

[0064] 8) Intake of engine 3: The supercharged mixture and the exhaust gas mixture after temperature adjustment by the three-way butterfly valve 8 enter the mixing pipe 1 after the flow is regulated by the throttle 30 and the EGR valve 86, and finally enter the cylinder of the engine 3 for combustion and work.

[0065] The patent of the present invention has a high degree of integration. The design using the three-way butterfly valve 8 is often more compact and can be more easily integrated with other system components (such as EGR cooler, EGR valve 86, intercooler 7, etc.), thereby significantly reducing the length and complexity of the bypass line. This not only helps to save valuable engine 3 compartment space, but also reduces the difficulty and cost of pipeline layout. This high degree of integration not only reduces system complexity, but also improves the reliability and maintainability of the overall system. By closely combining the three-way butterfly valve 8 with the EGR cooler and intercooler 7 circuits, a functional and compact overall module can be formed. This modular design simplifies the installation process and improves the overall performance and reliability of the system. At the same time, it also facilitates subsequent maintenance and replacement work because the entire module can be disassembled and assembled as a whole.

[0066] 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. Small gas flow resistance: By adjusting the channel diameter and the valve plate opening, the gas flow resistance can be accurately controlled and the throttling efficiency can be improved.

[0067] It is very important to optimize the performance of the engine 3 and reduce emissions. The exhaust gas in the EGR system has a high temperature and may contain corrosive substances. The three-way butterfly valve 8 is usually made of high temperature resistant and corrosion resistant materials to ensure long-term stable operation.

[0068] The specific implementation of the present invention described above does not constitute a limitation on the protection scope 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 protection scope of the claims of the present invention.

Claims

1. An engine air intake system, characterized in that: include: A main pipe, including a mixing pipe and an exhaust pipe, wherein the mixing pipe is used to connect to an air inlet of an engine, and the exhaust pipe is used to connect to an exhaust port of the engine; Two groups of exhaust gas recirculation pipelines, two ends of each exhaust gas recirculation pipeline are 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 pipelines, one end of each of the intercooler pipelines is connected to the mixing pipe; An intercooler, provided in any of the intercooling pipelines; and 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.

2. The engine intake system according to claim 1, characterized in that: One of the two groups of exhaust gas recirculation pipelines 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 two second opening valves.

3. The engine air intake system according to claim 2, 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.

4. The engine air intake system according to claim 2, characterized in that: The engine intake system further comprises a driving 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.

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

6. The engine air intake system according to claim 5, 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 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, The intercooler input pipe is connected to the two intercooler pipelines respectively, one end of each intercooler pipeline 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.

7. The engine air intake system according to claim 6, 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 throttle valve and the exhaust gas recirculation pipeline and the connection between the intercooling pipeline.

8. The engine air intake system according to claim 5, characterized in that: The exhaust gas pipe is also connected to the turbine of the supercharger.

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

10. A vehicle, characterized in that: Comprising an engine intake system as described in any one of claims 1-9.

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