Engine exhaust gas recirculation EGR system

Abstract

The present invention belongs to the technical field of engine exhaust gas purification, and proposes an engine exhaust gas recirculation EGR system, including an engine, an intake manifold, an exhaust manifold, a first cooler, a compressor, an intake pipe, a turbine, an engine exhaust pipe, a bypass pipe, a second cooler and an EGR valve, wherein the EGR valve includes a valve body, an intake interface, an EGR exhaust pipe, a valve core, a valve stem, a reset spring and a driving mechanism, wherein the driving mechanism includes two motors, and the two motors drive a spring to control the valve stem, and the top of the valve stem is connected to the spring through a driving handle, and the valve body is provided with a breathing assembly in a direction opposite to the valve core, and the EGR exhaust pipe is provided with a fracture at a position close to the valve body, and a smoke adsorption mechanism is provided at the fracture. The device has a reasonable design, a simple structure, is conducive to reducing carbon deposition, an EGR valve with a dual driving source, good stepless adjustment performance and high space utilization, and is suitable for large-scale promotion.

Description

Technical Field

[0001] The invention belongs to the technical field of engine exhaust gas purification, and in particular relates to an engine exhaust gas recirculation (EGR) system. Background Art

[0002] Exhaust Gas Recirculation, EGR (Exhaust Gas Return), the engine control computer, i.e. ECU, controls the solenoid valve to open in time according to the engine speed, load, temperature, intake flow, and exhaust temperature. The EGR valve opens, and a small amount of exhaust gas in the exhaust enters the intake system through the EGR valve, and enters the cylinder to participate in the combustion after mixing with the mixed gas. A small amount of exhaust gas enters the cylinder to participate in the combustion of the mixed gas, which reduces the temperature in the cylinder during combustion. Since NOx is generated under high temperature and rich oxygen conditions, the generation of NOx is suppressed, thereby reducing the NOx content in the exhaust gas. For example, CN114183278B discloses an EGR ejector piping system and an EGR control method, in which a supercharger and an intake pipe reversing valve, an EGR ejector and an EGR reversing valve of the EGR ejector piping system are sequentially arranged on a first passage; the EGR ejector piping system is connected to the engine body through a first passage; when the ECU determines that a first pressure is greater than or equal to a second pressure, the ECU controls the intake pipe reversing valve and the EGR reversing valve to open the first passage, so that air flows through the intake pipe reversing valve and the EGR ejector, and the engine exhaust gas is led back to the engine body under the action of the EGR ejector.

[0003] Excessive exhaust gas recirculation will affect the ignition and performance of the mixture, thus affecting the power of the engine, especially when the engine is running at full speed, low speed, small load or cold engine, the recirculated exhaust gas will obviously affect the engine performance. Therefore, when the engine is running at full speed, low speed, small load or cold engine, the ECU controls the exhaust gas not to recirculate to avoid affecting the engine performance. However, when the recirculated exhaust gas participates in the secondary intake, the smoke particles contained in the gas will also participate in the circulation system, and in the case of water, it will increase the generation of carbon deposits, affecting the intake quality and combustion efficiency; furthermore, for the electric EGR valve currently used, only an electric motor is used as the driving source, and its execution action generally adopts a cam transmission mechanism, which uses the cam transmission mechanism to drive the EGR valve stem to perform the opening and closing action. On the one hand, in order to ensure that the cam has a sufficient rotation range, the transmission housing needs to reserve sufficient margin, and the space utilization rate is low. On the other hand, once the motor fails, the cam transmission mechanism cannot operate, which will directly affect the opening and closing performance of the EGR valve, thereby affecting the exhaust gas recirculation process; secondly, after the exhaust gas circulation process is completed, there is a certain amount of gas residue inside the EGR valve. If the gas cannot be discharged in time, it will directly increase the resistance to the start-up of the valve core, which will not only increase energy consumption, but also be unfavorable for controlling the circulation flow of the exhaust gas recirculation. Summary of the invention

[0004] In view of the technical problems existing in the above-mentioned EGR system, the present invention proposes an engine exhaust gas recirculation EGR system which has a reasonable design, is conducive to reducing carbon deposits, has an EGR valve with dual driving sources, has good stepless adjustment performance and high space utilization.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is that the engine exhaust gas recirculation EGR system provided by the present invention includes an engine, wherein an intake manifold and an exhaust manifold are arranged on the engine, a first cooler, a compressor and an intake pipe are arranged on the intake side of the intake manifold, a turbine and an engine exhaust pipe are arranged on the exhaust side of the exhaust manifold, a bypass pipe is arranged on the engine exhaust pipe, a second cooler and an EGR valve are arranged in the output direction of the bypass pipe, the EGR valve includes a valve body, an intake interface connected to the second cooler and an EGR exhaust pipe connected to the intake manifold are arranged on the side of the valve body, a valve core, a valve stem and a return spring are arranged inside the valve body, and a driving end of the valve stem is provided with a driving Mechanism, the driving mechanism includes two motors, the power output ends of the motors are each provided with a gear set, the power output end of the gear set is provided with a shaft, the shaft is provided with a spring wheel, the transmission side of the spring wheel is provided with a guide wheel, the guide wheel is provided on a fixed hinge, the two spring wheels are connected by a spring, the spring is matched with the guide wheel for transmission and the middle part is connected with the top of the valve stem, the top of the valve stem is provided with a driving handle, the driving handle is provided with a through hole for passing the spring, the valve body is provided with a breathing assembly in the direction opposite to the valve core, the EGR exhaust pipe is provided with a fracture at a position close to the valve body, the two ends of the fracture are connected by bolts, and a flue gas adsorption mechanism is provided inside the fracture.

[0006] Preferably, the top surface of the driving handle is provided with an axial hole connected with the through hole in a cross shape, a guide bolt is provided in the axial hole, and a guide long hole matching with the guide bolt is provided on the mainspring, and the length of the guide long hole is twice the working length of the valve stem.

[0007] Preferably, the breathing assembly includes a bottom cover, which is movably matched with the breathing port arranged at the bottom of the valve body, and a plurality of breathing holes are arranged on the side of the bottom cover. A pull rod is arranged inside the bottom cover, and a push plate is arranged on the top of the pull rod. The top surface of the push plate is in contact with and matched with the ejector pin arranged at the bottom of the valve core, and the push plate and the pull rod are clearance-matched with the ejector pin hole arranged inside the valve body, and a preload spring is arranged between the ejector pin hole and the push plate.

[0008] Preferably, the smoke adsorption mechanism includes two bearing mounting plates distributed on the top and bottom surfaces of the fracture, multiple pairs of bearings are arranged on the bearing mounting plates, a pair of rotating adsorption parts cooperating with the bearings are arranged between the bearing mounting plates, and a guide pulley part is arranged between the rotating adsorption parts.

[0009] Preferably, the rotating adsorption component includes a hollow adsorption shaft petal, the cross-section of the adsorption shaft petal is fan-shaped, the two ends of all the adsorption shaft petals are connected by two adsorption end shafts, a butterfly plate is arranged on the side of the adsorption shaft petal, the side edge curve of the butterfly plate is W-shaped, the cross-section of the butterfly plate is fan-shaped and a plurality of adsorption holes are arranged on the plate surface, and an adsorption filler is arranged inside the butterfly plate.

[0010] Preferably, the guide wheel component includes a hollow guide shaft petal, the cross-section of the guide shaft petal is fan-shaped, both ends of all the guide shaft petals are connected by two guide end shafts, and the side of the guide shaft petal is provided with a waist drum-shaped piece that is clearance-fitted with the butterfly plate.

[0011] Preferably, the adsorption end shaft comprises a shaft cover, and an inner shaft is arranged inside the shaft cover.

[0012] Preferably, a core shaft is arranged between the inner shafts, and a plurality of armature plates for spacing adjacent butterfly plates are arranged on the side of the core shaft.

[0013] Preferably, an ejector is provided inside the EGR exhaust pipe, and the diameter of the ejector gradually decreases from its intake end to its exhaust end.

[0014] Preferably, the end of the EGR exhaust pipe has a rectangular cross-section and is provided with two branch pipes, and the two branch pipes are connected to different front and rear positions of the intake manifold.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are:

[0016] 1. The engine exhaust gas recirculation (EGR) system provided by the present invention can adsorb the exhaust gas that is about to be mixed with new air by setting a smoke adsorption mechanism, thereby reducing humidity and impurities such as smoke oil, which is beneficial to improving the quality of gas entering the engine and reducing carbon deposits.

[0017] 2. The engine exhaust gas recirculation EGR system provided by the present invention is driven by a dual motor and has a flexible structure spring as a valve stem braking structure. Under the premise of ensuring the effective driving of the valve stem, it can not only improve the equipment space utilization rate, but also realize the opening and closing operation of the valve in the case of a single motor, which is beneficial to ensure the exhaust gas recirculation efficiency of the system.

[0018] 3. The engine exhaust gas recirculation (EGR) system provided by the present invention utilizes a breathing component to discharge a portion of the gas remaining in the previous working stroke while the valve core is started, thereby achieving automatic pressure relief, which is beneficial to ensuring the starting performance of the EGR valve, and to a certain extent reducing energy consumption, and is beneficial to improving the accuracy of controlling the circulation flow of the exhaust gas recirculation.

[0019] 4. The device has reasonable design, simple structure, is conducive to reducing carbon deposits, has an EGR valve with dual drive sources, has good stepless adjustment performance and high space utilization, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 An axonometric view of an EGR valve provided in an embodiment;

[0022] Figure 2 A schematic diagram of the structure of an engine exhaust gas recirculation (EGR) system provided in an embodiment;

[0023] Figure 3 An axonometric front view of an EGR valve provided in an embodiment;

[0024] Figure 4 A cross-sectional view of the EGR valve provided in the embodiment along the DD direction;

[0025] Figure 5 A schematic diagram of the internal structure of an EGR valve provided in an embodiment;

[0026] Figure 6 A cross-sectional view of the EGR valve provided in the embodiment in another direction;

[0027] Figure 7 An axonometric view of a drive mechanism, a valve stem, a valve core, and a breathing assembly provided for an embodiment;

[0028] Figure 8 Axonometric diagram of the distribution of the fume adsorption mechanism in the EGR exhaust pipe provided in the embodiment;

[0029] Fig. 9 A front view of the distribution of the flue gas adsorption mechanism in the EGR exhaust pipe provided in the embodiment;

[0030] Fig.10 A working diagram of a rotating adsorption member and a guide wheel member provided in an embodiment;

[0031] Fig.11 A front view of the mandrel and the armature provided in the embodiment;

[0032] Fig.12 An axonometric view of a branch pipe provided for an embodiment;

[0033] In the above figures, 1, EGR valve; 11, valve body; 12, intake interface; 13, EGR exhaust pipe; 14, valve core; 15, valve stem; 16, reset spring; 17, driving mechanism; 171, motor; 172, gear set; 173, spring shaft; 174, spring wheel; 175, guide wheel; 176, fixed hinge; 177, spring; 177a, guide long hole; 18, driving handle; 181, through hole; 182, shaft hole; 183, guide bolt; 19, breathing assembly; 191, bottom cover; 192, breathing hole; 193, pull rod; 194, push plate; 195, ejector pin; 196, ejector pin hole; 197, preload spring; 110, fracture; 1 11. ejector; 112. branch pipe; 2. engine; 21. intake manifold; 22. exhaust manifold; 3. first cooler; 4. compressor; 5. intake pipe; 6. turbine; 7. engine exhaust pipe; 8. bypass pipe; 9. second cooler; 10. flue gas adsorption mechanism; 101. bearing mounting plate; 102. rotating adsorption member; 102a. adsorption shaft petal; 102b. adsorption end shaft member; 102b1. shaft cover; 102b2. inner shaft; 102c. butterfly plate; 102d. adsorption hole; 103. guide dial member; 103a. guide shaft petal; 103b. guide end shaft member; 103c. waist drum-shaped piece; 104. core shaft; 105. armature piece. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the accompanying drawings themselves, and do not limit the structure.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0036] Examples, such as Figures 1 to 12As shown, the engine exhaust gas recirculation EGR system provided by the present invention includes an engine 2, wherein the engine 2 is provided with an intake manifold 21 and an exhaust manifold, the intake side of the intake manifold 21 is provided with a first cooler 3, a compressor 4 and an intake pipe 5, the exhaust side of the exhaust manifold is provided with a turbine 6 and an engine exhaust pipe 7, the engine exhaust pipe 7 is provided with a bypass pipe 8, and the output direction of the bypass pipe 8 is provided with a second cooler 9 and an EGR valve 1, the EGR valve 1 includes a valve body 11, the side of the valve body 11 is provided with an intake interface 12 connected to the second cooler 9 and an EGR exhaust pipe 13 connected to the intake manifold 21, the interior of the valve body 11 is provided with a valve core 14, a valve stem 15 and a return spring 16, and the driving end of the valve stem 15 is provided with a driving mechanism 17. Among them, the driving mechanism 17 drives the valve stem 15 to rise and fall to control the valve core 14 to cooperate with the intake valve port, the intake valve port is opposite to the intake interface 12, and the exhaust valve port of the EGR valve 1 is opposite to the intake end of the EGR exhaust pipe 13. The first cooler 3 cools the compressed air entering the intake pipe 5, and the second cooler 9 cools the circulating exhaust gas. The bypass pipe 8 is provided with an automatic valve plate at the connection node between it and the exhaust port of the engine 2. The automatic valve plate can be automatically opened when negative pressure appears in the direction of the EGR valve 1, that is, when the EGR valve 1 is opened, so as to introduce part of the exhaust gas into the EGR system. On this basis, the driving mechanism 17 provided by the present invention includes two motors 171, and the power output ends of the motors 171 are each provided with a gear set 172, and the power output end of the gear set 172 is provided with a shaft 173, and a spring wheel 174 is provided on the shaft 173, and a guide wheel 175 is provided on the transmission side of the spring wheel 174, and the guide wheel 175 is provided on the fixed hinge 176, and the two spring wheels 174 are connected by a spring 177, and the spring 177 is matched with the guide wheel 175 for transmission and is connected to the top of the valve stem 15 in the middle, and a driving handle 18 is provided on the top of the valve stem 15, and a through hole 181 for passing the spring 177 is provided on the driving handle 18, and the valve body 11 is provided with a breathing assembly 19 in the direction opposite to the valve core 14, and the EGR exhaust pipe 13 is provided with a break 110 at its position close to the valve body 11, and the two ends of the break 110 are connected by bolts, and a flue gas adsorption mechanism 10 is provided inside the break 110.

[0037] Specifically, by providing the flue gas adsorption mechanism 10, the exhaust gas to be mixed with the new air can be adsorbed to reduce humidity and impurities such as smoke oil, which is beneficial to improving the quality of the gas entering the engine 2, thereby reducing carbon deposition and improving the combustion performance of the air in the engine 2. Furthermore, the drive mechanism 17 is driven by a dual motor 171, and a flexible structure spring 177 is used as a structure for braking the valve stem 15. Under the premise of ensuring the effective driving of the valve stem 15, it can not only improve the space utilization of the equipment, but also realize the opening and closing operation of the valve in the case of a single motor, which is beneficial to ensuring the exhaust gas recirculation efficiency of the system. More specifically, in addition to the motor 171, the other structures of the driving mechanism 17 are arranged inside the transmission box. The interior of the transmission box can provide axial end support for the gear group 172, the barrel shaft 173 and the guide wheel 175. The gear group 172 includes a vertical driving gear and a driven gear. The driven gear is coaxially connected to the barrel shaft 173. The motor 171 drives the driving gear and the driven gear to achieve a certain deceleration effect, and the decelerated power is transmitted to the spring wheel 174 through the barrel shaft 173. The spring wheel 174 is used to adjust the actual length of the spring 177. For example, when the release length of the spring 177 becomes shorter, the valve stem 15 can be lowered, thereby achieving the purpose of opening the EGR valve 1; conversely, if the release length of the spring 177 becomes longer, the valve stem 15 can be reset under the dynamic balance of the reset spring 16 and the spring 177, thereby causing the valve core 14 to close the intake valve port, that is, to close the EGR valve 1. The entire adjustment process of the spring 177 has the characteristics of stepless adjustment, which can effectively improve the control accuracy of the exhaust gas recirculation flow, thereby improving the operating performance of the engine 2 under different loads. The drive mechanism 17 provided by the present invention can adjust the length of the spring 177 when the two motors 171 work simultaneously, and can also adjust the length of the spring 177 when a single motor 171 works. The spring 177 is a structure that directly drives the valve stem 15, and has a flexible characteristic. While achieving force transmission at multiple node positions, it has a high space utilization rate.

[0038] The engine exhaust gas recirculation (EGR) system provided by the present invention. The breathing component 19 can discharge the gas remaining in the previous working stroke simultaneously when the valve core 14 is activated, which is beneficial to ensuring the starting performance of the EGR valve 1, reducing energy consumption to a certain extent, and improving the accuracy of controlling the recirculation flow rate of the exhaust gas recirculation. Specifically, the breathing component 19 includes a bottom cover 191, the bottom cover 191 is movably matched with the breathing port provided at the bottom of the valve body 11. A plurality of breathing holes 192 are provided on the side surface of the bottom cover 191. A pull rod 193 is provided inside the bottom cover 191. A push plate 194 is provided at the top of the pull rod 193. The top surface of the push plate 194 is in contact and cooperation with the ejector pin 195 provided at the bottom of the valve core 14. The push plate 194 and the pull rod 193 are in clearance fit with the ejector pin hole 196 provided inside the valve body 11. A pre-tightening spring 197 is provided between the ejector pin hole 196 and the push plate 194. Among them, the ejector pin 195 rises and falls synchronously with the valve core 14. When the valve core 14 is driven by the driving mechanism 17 to make a descending movement, that is, when the EGR valve 1 is activated, the ejector pin 195 pushes the push plate 194, the pull rod 193 and the bottom cover 191 to descend. A part of the redundant gas in the previous working stroke enters the bottom cover 191 from the gap of the ejector pin hole 196 and is then discharged from the breathing holes 192 to achieve automatic pressure relief. The pre-tightening spring 197 can make the bottom cover 191 seal the breathing port to a certain extent after the EGR valve 1 is closed and maintain a certain seal.

[0039] In order to improve the driving performance of the driving mechanism 17 on the valve stem 15, the top surface of the driving handle 18 provided by the present invention is provided with a shaft hole 182 that is cross-connected with the through hole 181. A guiding bolt 183 is provided in the shaft hole 182. A guiding long hole 177a that cooperates with the guiding bolt 183 is provided on the hairspring 177. The length of the guiding long hole 177a is twice the working length of the valve stem 15. Among them, the through hole 181 can ensure that the hairspring 177 and the driving handle 18 have a repeated contact area so as to apply pressure to the driving handle 18. When the hairspring 177 is synchronously driven to release or wind up by two motors 171, the guiding bolt 183 is near the middle position of the guiding long hole 177a. When a single motor 171 drives the hairspring 177, the displacement of the hairspring 177 is consistent with the relative displacement between the guiding bolt 183 and the guiding long hole 177a. In this way, the working rotation angle of a single motor is twice the rotation angle when the two motors 171 work synchronously, so that it can drive the valve stem 15 to complete a complete opening and closing action in a single-acting manner and ensure the working performance of the EGR valve 1 in the system.

[0040] In order to improve the quality of the exhaust gas circulation entering the engine 2, the fume adsorption mechanism 10 provided by the present invention includes two bearing mounting plates 101 distributed on the top surface and the bottom surface of the fracture 110, and multiple pairs of bearings are arranged on the bearing mounting plates 101. A pair of rotating adsorption members 102 cooperating with the bearings are arranged between the bearing mounting plates 101, and a guide paddle wheel member 103 is arranged between the rotating adsorption members 102. In this way, in the process of entering the fracture 110 position from the exhaust valve port of the EGR valve 1, a part of the exhaust gas is rotated to the rotating adsorption member 102 by the guide paddle wheel member 103, and the rotating adsorption member 102 removes oil, dries and filters part of the exhaust gas; at the same time, although the guide paddle wheel member 103 and the rotating adsorption member 102 reduce the actual flow diameter at the fracture 110, the exhaust gas rate can be increased in a rotating manner, thereby ensuring that the flow rate of the exhaust gas is within a reasonable control range.

[0041] Furthermore, the rotating adsorption component 102 provided by the present invention includes a hollow adsorption shaft petal 102a, the cross-section of the adsorption shaft petal 102a is fan-shaped, the two ends of all the adsorption shaft petals 102a are connected by two adsorption end shaft components 102b, a butterfly plate 102c is arranged on the side of the adsorption shaft petal 102a, the side edge curve of the butterfly plate 102c is W-shaped, the cross-section of the butterfly plate 102c is fan-shaped and a plurality of adsorption holes 102d are arranged on the plate surface, and an adsorption filler is arranged inside the butterfly plate 102c. In this way, the open butterfly plate 102c can generate rotational power under the power of exhaust gas and the injection of new air, thereby promoting the exhaust gas to flow toward the EGR exhaust pipe 13; furthermore, the present invention distributes adsorption fillers inside each butterfly plate 102c, which can increase the contact area between the flowing exhaust gas and the entire rotating adsorption component 102, and the exhaust gas entrained by the rotating butterfly plate 102c can complete material exchange with the adsorption filler, and the proximal port diameter of the adjacent butterfly plate 102c is smaller than the distal port diameter. The exhaust gas enters between the adjacent butterfly plates 102c and can flow in the upper and lower directions, passing over the adsorption filler to achieve flue gas treatment, so the rotating adsorption component 102 can achieve the purpose of rapid treatment of exhaust gas.

[0042] The guide wheel component 103 provided by the present invention includes a hollow guide shaft petal 103a, the cross-section of the guide shaft petal 103a is fan-shaped, and both ends of all the guide shaft petals 103a are connected by two guide end shaft components 103b. The side of the guide shaft petal 103a is provided with a waist drum-shaped piece 103c that is clearance-matched with the butterfly plate 102c. The waist drum-shaped piece 103c cooperates with the butterfly plate 102c to reduce the amount of waste gas that is leaked, and the waist drum-shaped piece 103c guides a part of the waste gas to between the butterfly plates 102c during rotation, thereby promoting the treatment effect of the flue gas adsorption mechanism 10 on the flue gas.

[0043] In order to facilitate the replacement of the rotating adsorption member 102 and the guide dial member 103, in the smoke adsorption mechanism 10 provided by the present invention, the adsorption end shaft member 102b and the guide end shaft member 103b adopt the same structure and are used to constrain all adsorption shaft petals 102a and guide shaft petals 103a, such as the adsorption end shaft member 102b includes a shaft cover 102b1, and an inner shaft 102b2 is arranged inside the shaft cover 102b1. The shaft cover 102b1 is used to rotate with the bearing, and the inner shaft 102b2 is used to control the spacing between adjacent adsorption shaft petals 102a and the spacing between adjacent guide shaft petals 103a.

[0044] Furthermore, in the present invention, a core shaft 104 is arranged between the inner shafts 102b2, and a plurality of armature pieces 105 for spacing adjacent butterfly plates 102c are arranged on the side of the core shaft 104. By setting different numbers of armature pieces 105, the spacing between adjacent adsorption shaft petals 102a and the spacing between adjacent guide shaft petals 103a can be effectively fine-tuned, so that the rotating adsorption component 102 and the guide dial component 103 are set with different numbers of unit groups according to the requirements of the system, thereby obtaining different adsorption and exhaust gas treatment capabilities.

[0045] In order to improve the performance of exhaust gas entering the intake manifold 21, in addition to using the pressure of compressed air in the intake manifold 21 to eject, the present invention also provides an ejector 111 inside the EGR exhaust pipe 13, and the diameter of the ejector 111 gradually decreases from its intake end to its exhaust end. Under the joint action of the ejector 111 and the intake manifold 21, the exhaust gas obtains a certain flow rate to mix with the compressed air, and the smoke adsorption mechanism 10 can further promote the efficiency of exhaust gas entering the intake manifold 21 in a rotating manner.

[0046] In order to improve the mixing performance of exhaust gas and compressed air, the end of the EGR exhaust pipe 13 provided by the present invention has a rectangular cross-section and is provided with two branch pipes 112. The two branch pipes 112 are connected at different positions in front and behind the intake manifold 21. The branch pipes 112 are used to divert and inject the circulating exhaust gas from different positions into the compressed air, which is beneficial to improving the performance of the injected exhaust gas and improving the stability of the airflow in the intake manifold 21, thereby improving the actual operating performance of the engine 2.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An engine exhaust gas recirculation (EGR) system, comprising an engine, wherein an intake manifold and an exhaust manifold are provided on the engine, a first cooler, a compressor and an intake pipe are provided on the intake side of the intake manifold, a turbine and an engine exhaust pipe are provided on the exhaust side of the exhaust manifold, a bypass pipe is provided on the engine exhaust pipe, a second cooler and an EGR valve are provided in the output direction of the bypass pipe, the EGR valve comprises a valve body, an intake interface connected to the second cooler and an EGR exhaust pipe connected to the intake manifold are provided on the side of the valve body, a valve core, a valve stem and a return spring are provided inside the valve body, a driving mechanism is provided on the driving end of the valve stem, and the valve body is characterized in that: The driving mechanism includes two motors, each of which is provided with a gear set at the power output end of the motor, and a shaft is provided at the power output end of the gear set, and a spring wheel is provided on the shaft, and a guide wheel is provided on the transmission side of the spring wheel, and the guide wheel is provided on a fixed hinge, and the two spring wheels are connected by a spring, and the spring cooperates with the guide wheel in transmission and is connected to the top of the valve stem in the middle, and a driving handle is provided on the top of the valve stem, and a through hole for inserting the spring is provided on the driving handle, and a breathing assembly is provided on the valve body in a direction opposite to the valve core, and a fracture is provided on the EGR exhaust pipe at a position close to the valve body, and the two ends of the fracture are connected by bolts, and a flue gas adsorption mechanism is provided inside the fracture.

2. The engine exhaust gas recirculation (EGR) system according to claim 1, characterized in that: The top surface of the driving handle is provided with an axial hole connected with the through hole in a cross shape, a guide bolt is provided in the axial hole, and a guide long hole matching with the guide bolt is provided on the mainspring, and the length of the guide long hole is twice the working length of the valve stem.

3. The engine exhaust gas recirculation (EGR) system according to claim 1, characterized in that: The breathing assembly includes a bottom cover, which is movably matched with the breathing port arranged at the bottom of the valve body, and a plurality of breathing holes are arranged on the side of the bottom cover. A pull rod is arranged inside the bottom cover, and a push plate is arranged on the top of the pull rod. The top surface of the push plate is in contact with and matched with the ejector pin arranged at the bottom of the valve core, and the push plate and the pull rod are clearance-matched with the ejector pin hole arranged inside the valve body, and a preload spring is arranged between the ejector pin hole and the push plate.

4. The engine exhaust gas recirculation (EGR) system according to claim 1, characterized in that: The smoke adsorption mechanism includes two bearing mounting plates distributed on the top and bottom surfaces of the fracture, multiple pairs of bearings are arranged on the bearing mounting plates, a pair of rotating adsorption parts matching with the bearings are arranged between the bearing mounting plates, and a guide pulley part is arranged between the rotating adsorption parts.

5. The engine exhaust gas recirculation (EGR) system according to claim 4, characterized in that: The rotating adsorption component includes a hollow adsorption shaft petal, the cross-section of the adsorption shaft petal is fan-shaped, the two ends of all the adsorption shaft petals are connected by two adsorption end shafts, a butterfly plate is arranged on the side of the adsorption shaft petal, the side edge curve of the butterfly plate is W-shaped, the cross-section of the butterfly plate is fan-shaped and a plurality of adsorption holes are arranged on the plate surface, and an adsorption filler is arranged inside the butterfly plate.

6. The engine exhaust gas recirculation (EGR) system according to claim 5, characterized in that: The guide thumbwheel component comprises a hollow guide shaft petal, the cross section of the guide shaft petal is fan-shaped, both ends of all the guide shaft petals are connected by two guide end shafts, and the side of the guide shaft petal is provided with a waist drum-shaped piece which is clearance-matched with the butterfly plate.

7. The engine exhaust gas recirculation (EGR) system according to claim 6, characterized in that: The adsorption end shaft comprises a shaft cover, and an inner shaft is arranged inside the shaft cover.

8. The engine exhaust gas recirculation (EGR) system according to claim 7, characterized in that: A core shaft is arranged between the inner shafts, and a plurality of armature plates for spacing adjacent butterfly plates are arranged on the side of the core shaft.

9. The engine exhaust gas recirculation (EGR) system according to claim 1, characterized in that: An ejector is arranged inside the EGR exhaust pipe, and the diameter of the ejector gradually decreases from its intake end to its exhaust end.

10. The engine exhaust gas recirculation (EGR) system according to claim 1, characterized in that: The end of the EGR exhaust pipe has a rectangular cross section and is provided with two branch pipes, which are connected to different front and rear positions of the intake manifold.

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