Exhaust gas recirculation system, powertrain, and vehicle

Abstract

The present invention relates to an exhaust gas recirculation system, a powertrain, and a vehicle. The exhaust gas recirculation system includes a catalyst, an intake manifold, an exhaust pipe, an air intake sleeve, and an air intake duct. The catalyst is used to receive exhaust gas generated by an engine cylinder; the intake manifold is used to connect a throttle valve and the engine cylinder; the exhaust pipe has an outlet connected to the intake manifold; a mounting channel is formed in the air intake sleeve, the catalyst passes through the mounting channel and is fixedly connected to the mounting channel, and a closed air intake chamber is formed in the side wall of the mounting channel; the exhaust pipe has an air inlet connected to the air intake chamber; the air intake duct is arranged on the side wall of the mounting channel, one end of the air intake duct is connected to the air intake chamber, and the other end of the air intake duct is connected to the interior of the catalyst. The present invention can buffer exhaust gas in the air intake chamber before entering the exhaust pipe, thereby reducing fluctuations in exhaust gas pressure, thereby making the exhaust gas flow more stable in the exhaust pipe, and further making the exhaust gas more stable after entering the intake manifold.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle exhaust gas recirculation, and in particular to an exhaust gas recirculation system, a power assembly and a vehicle. Background Art

[0002] As environmental protection requirements become increasingly stringent, vehicle exhaust emission requirements are also getting higher and higher. Therefore, current vehicles usually guide the exhaust gas in the catalyst through the EGR pipe to the intake manifold, so that the EGR gas is mixed with fresh air and then enters the engine cylinder for combustion, so as to reduce the emission of NOx in the exhaust gas emitted by the vehicle, thereby reducing air pollution.

[0003] However, current vehicles usually connect the air intake of the EGR pipe directly to the inside of the catalyst. In addition, the naturally aspirated engines used in current vehicles usually have four cylinders, and the exhaust gas pressure generated in the four cylinders fluctuates. This will cause the exhaust gas in the four cylinders to enter the catalyst and mix. There will be pressure fluctuations, which will cause the airflow of the exhaust gas to be unstable after entering the EGR pipe, which will affect the uniformity of the mixing of the EGR gas and the fresh air in the intake manifold. Summary of the Invention

[0004] This application provides an exhaust gas recirculation system, powertrain, and vehicle to at least address the related technical problem of unstable airflow entering the EGR duct, which affects the uniform mixing of EGR gas with fresh air in the intake manifold. The technical solutions employed by this invention are as follows:

[0005] According to the first aspect of the present application, an exhaust gas recirculation system is provided, comprising a catalyst, an intake manifold, an exhaust gas pipe, an air intake sleeve and an air intake pipe, wherein the catalyst is used to receive exhaust gas generated by the engine cylinder; the intake manifold is used to connect the throttle valve and the engine cylinder; the air outlet of the exhaust gas pipe is connected to the intake manifold; an installation channel is formed in the air intake sleeve, the catalyst passes through the installation channel and is fixedly connected to the installation channel, and a closed air intake chamber is formed in the side wall of the installation channel; the air inlet of the exhaust gas pipe is connected to the air intake chamber; the air intake pipe is arranged on the side wall of the installation channel, and one end of the air intake pipe is connected to the air intake chamber, and the other end of the air intake pipe is connected to the interior of the catalyst.

[0006] According to the above technical means, by fixing the catalyst on the installation channel in the air intake sleeve, and providing a closed air intake chamber in the air intake sleeve, and then connecting the air intake chamber and the interior of the catalyst through the air intake pipe, the exhaust gas generated by the engine cylinder can enter the catalyst and then flow through the air intake pipe into the air intake chamber, so that the exhaust gas can be cached in the air intake chamber; the air inlet of the exhaust gas pipe is connected to the air intake chamber, and the exhaust gas can enter the exhaust gas pipe after being cached in the air intake chamber. After the exhaust gas is cached in the air intake chamber, the exhaust gas can be fully mixed, so that the pressure of the exhaust gas is relatively stable, reducing the fluctuation of the exhaust gas pressure, and then there will be no large pressure fluctuation after the exhaust gas enters the exhaust gas pipe, so that the exhaust gas can flow more stably in the exhaust gas pipe.

[0007] The outlet of the exhaust pipe is connected to the intake manifold, and the exhaust gas in the exhaust pipe can enter the intake manifold. At the same time, the intake manifold is connected to the throttle valve and the engine cylinder. Fresh air will enter the intake manifold through the throttle valve, so that the fresh air and exhaust gas can be mixed in the intake manifold and then enter the engine cylinder for combustion. Since the exhaust gas flows relatively stably in the exhaust pipe, the exhaust gas is also relatively stable after entering the intake manifold, so that the exhaust gas and fresh air can be stably mixed, so that the two are mixed evenly, and then the mixed gas can enter the engine cylinder and burn more stably and fully.

[0008] In one possible embodiment, the interior of the catalyst has an air flow channel for exhaust gas circulation, the air flow channel is connected to the other end of the air intake pipe, the air flow channel includes a first area and a second area, the exhaust gas pressure in the first area is greater than the exhaust gas pressure in the second area; there are multiple air intake pipes, a part of the multiple air intake pipes connects the air intake chamber and the first area, and the other part connects the air intake chamber and the second area, and the number of air intake pipes connecting the air intake chamber and the first area is greater than the number of air intake pipes connecting the air intake chamber and the second area.

[0009] According to the above technical means, the amount of exhaust gas from the area with high gas pressure in the air flow channel entering the air intake chamber and the amount of exhaust gas from the area with low gas pressure in the air flow channel entering the air intake chamber can be relatively balanced, so that the exhaust gas entering the air intake chamber can be quickly and fully mixed to reduce the fluctuation of exhaust gas pressure.

[0010] In a possible implementation, the first area and the second area are arranged around the axis of the installation channel, and the plurality of air extraction pipes are arranged at intervals around the axis of the installation channel.

[0011] According to the above technical means, the communication between the air flow channel and the air intake chamber can be made more reasonable, so that the gas in the air flow channel can be further allowed to enter the air intake chamber in a more balanced manner.

[0012] In one possible embodiment, the catalyst includes a first-stage catalyst, a second-stage catalyst and a connecting pipe. The first-stage catalyst is used to receive the exhaust gas generated by the engine cylinder and perform initial purification of the exhaust gas; the second-stage catalyst is arranged on the outlet side of the first-stage catalyst, and is used to re-process and discharge the exhaust gas treated by the first-stage catalyst; the connecting pipe is connected between the first-stage catalyst and the second-stage catalyst, and connects the outlet of the first-stage catalyst and the inlet of the second-stage catalyst. The connecting pipe is passed through the installation channel, and the other end of the air intake pipe is connected to the connecting pipe.

[0013] According to the above technical means, the layout of the space in the cabin can be effectively utilized, and the processing of the connecting pipes and the air extraction sleeve is facilitated.

[0014] In one possible embodiment, the intake manifold includes an intake duct, a mixing duct and a resonance chamber, one end of the intake duct is used to connect to the throttle valve; the intake end of the mixing duct is connected to the other end of the intake duct; the intake end of the resonance chamber is connected to the outlet end of the mixing duct, and the outlet end of the resonance chamber is used to connect to the engine cylinder; the exhaust gas recirculation system also includes a guide duct, a first end of the guide duct is connected to the outlet of the exhaust pipe, and the second end of the guide duct extends into the interior of the mixing duct, and the end of the second end of the guide duct is closed and opposite to the intake duct; an outlet hole is opened on the side wall of the guide duct, the outlet hole is located inside the mixing duct, and connects the guide duct and the mixing duct.

[0015] According to the above technical means, the exhaust gas entering the mixing duct can be prevented from flowing in the direction of the fresh air entering, so that the fresh air and exhaust gas can smoothly enter the engine cylinder along the mixing duct and the resonance chamber, thereby increasing the mixing path of the exhaust gas and the fresh air, so that the exhaust gas and the fresh air can be fully mixed.

[0016] In a possible embodiment, there are two air outlet holes, an extension direction of one air outlet hole is perpendicular to an extension direction of the air inlet pipe, and an extension direction of the other air outlet hole is consistent with an extension direction of the mixing pipe and faces the resonance chamber.

[0017] According to the above technical means, the exhaust gas flowing out of one air outlet can be directly mixed with the fresh air, and the exhaust gas flowing out of the other air outlet can flow directly into the resonance chamber, so that the exhaust gas and fresh air can be fully mixed and the recycling rate of the exhaust gas can be improved.

[0018] In a possible implementation, an angle formed between an extension direction of the intake duct and an extension direction of the mixing duct is greater than 90° and less than 180°.

[0019] According to the above technical means, the resistance to the flow of fresh air at the connection between the intake duct and the mixing duct can be reduced, so that the fresh air entering the intake duct can enter the mixing duct more smoothly.

[0020] In a possible embodiment, the air extraction chamber extends around the axis of the installation channel, and along the radial direction of the air extraction chamber, the size of the air extraction chamber is greater than or equal to 5.5 mm and less than or equal to 8 mm.

[0021] According to the above-mentioned technical means, the volume of the air intake chamber can be increased while ensuring that the air intake chamber occupies a smaller space, so that the exhaust gas can be mixed and cached more effectively in the air intake chamber, and the air intake chamber can also be insulated from the outside of the catalyst to protect other components near the catalyst. In addition, the thickness of the air intake chamber is the same at various locations along its radial direction, which can facilitate the connection of the exhaust gas pipe to multiple positions of the air intake chamber, thereby facilitating the arrangement of the exhaust gas pipe in the cabin.

[0022] According to the second aspect provided by the present application, a powertrain is provided, comprising the above-mentioned exhaust gas recirculation system and an engine cylinder, wherein the air intake of the engine cylinder is connected to the air outlet end of the intake manifold, and the air outlet of the engine cylinder is connected to the air intake of the catalyst.

[0023] According to a third aspect provided by the present application, a vehicle is provided, comprising the above-mentioned powertrain.

[0024] Therefore, the above technical features of this application have the following beneficial effects:

[0025] (1) The present invention provides an air intake sleeve, forms an air intake chamber in the air intake sleeve, and provides an air intake pipe, so that the exhaust gas can be buffered in the air intake chamber before entering the exhaust gas pipeline, so that the exhaust gas can be fully mixed in the air intake chamber, thereby reducing the fluctuation of the exhaust gas pressure, so that the exhaust gas can flow more stably in the exhaust gas pipeline, and thus the exhaust gas can be more stable after entering the intake manifold, so that the exhaust gas and fresh air can be stably mixed, so that the two can be mixed evenly, and then the mixed gas can enter the engine cylinder and burn more stably and fully.

[0026] (2) The present invention makes the number of air intake pipes connecting the air intake chamber and the first area greater than the number of air intake pipes connecting the air intake chamber and the second area, so that the amount of exhaust gas from the area with high gas pressure in the air flow channel entering the air intake chamber and the amount of exhaust gas from the area with low gas pressure in the air flow channel entering the air intake chamber are relatively balanced, thereby enabling the exhaust gas entering the air intake chamber to be quickly and fully mixed to reduce the fluctuation of the exhaust gas pressure.

[0027] (3) The present invention arranges the first area and the second area around the axis of the installation channel, and arranges multiple air intake pipes around the axis of the installation channel at intervals, which can make the connection between the air flow channel and the air intake chamber more reasonable, thereby further allowing the gas in the air flow channel to enter the air intake chamber in a more balanced manner.

[0028] (4) The present invention can effectively utilize the layout of the space in the cabin by passing the connecting pipe through the installation channel, and facilitates the processing of the connecting pipe and the air extraction sleeve.

[0029] (5) The present invention extends the second end of the guide duct into the interior of the mixing duct, the end of the second end of the guide duct is closed, and an air outlet is opened on the side wall of the guide duct, which can prevent the exhaust gas entering the mixing duct from flowing in the direction of the fresh air entering, so that the fresh air and exhaust gas can smoothly enter the engine cylinder along the mixing duct and the resonance chamber, thereby increasing the mixing path of the exhaust gas and the fresh air, so that the exhaust gas and the fresh air are fully mixed.

[0030] (6) The present invention can fully mix the exhaust gas and fresh air by providing two air outlets, thereby improving the recycling rate of the exhaust gas.

[0031] (7) The present invention can reduce the resistance to the flow of fresh air at the connection between the intake duct and the mixing duct by making the angle between the extension direction of the intake duct and the extension direction of the mixing duct greater than 90° and less than 180°, so that the fresh air entering the intake duct can enter the mixing duct more smoothly.

[0032] (8) The present invention extends the air intake chamber around the axis of the installation channel, thereby increasing the volume of the air intake chamber while ensuring that the air intake chamber occupies a smaller space, so that the exhaust gas can be more effectively mixed and cached in the air intake chamber, and the air intake chamber can also insulate the outside of the catalyst to protect other components near the catalyst. In addition, the thickness of the air intake chamber is the same at various locations along its radial direction, so that the exhaust gas pipeline can be connected to multiple locations of the air intake chamber, thereby facilitating the arrangement of the exhaust gas pipeline in the engine room.

[0033] It should be noted that the technical effects brought about by any implementation method in the second to third aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0034] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0036] Figure 1 is a schematic structural diagram of an exhaust gas recirculation system according to an exemplary embodiment;

[0037] Figure 2is a schematic diagram of an air extraction sleeve according to an exemplary embodiment;

[0038] Figure 3 is a schematic cross-sectional view of an air extraction sleeve according to an exemplary embodiment;

[0039] Figure 4 is a schematic structural diagram of a flow guide pipe according to an exemplary embodiment;

[0040] Figure 5 is a schematic cross-sectional view of a flow guide pipe according to an exemplary embodiment.

[0041] in,

[0042] 1-catalyst; 11-first pipeline; 12-first stage catalyst; 13-second stage catalyst; 14-second pipeline; 15-connecting pipeline;

[0043] 2-intake manifold; 21-intake pipe; 22-mixing pipe; 23-resonance chamber; 24-mixed gas outlet pipe;

[0044] 3-exhaust pipe; 31-EGR intake pipe; 32-EGR cooler; 33-EGR valve; 34-EGR outlet pipe;

[0045] 4-air extraction sleeve; 41-installation channel; 411-air extraction chamber;

[0046] 5-Gas extraction pipeline;

[0047] 6- flow guide pipe; 61- air outlet; 611- first air outlet; 612- second air outlet. DETAILED DESCRIPTION

[0048] In order to enable ordinary people in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0049] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0050] At present, the layout of various components in the engine compartment of vehicles is becoming more and more compact, resulting in insufficient space in front of the throttle valve to arrange the EGR pipeline. As a result, some vehicles arrange the EGR pipeline after the throttle valve, which will cause the EGR gas to directly hit the cavity wall of the resonance cavity, resulting in the EGR gas and fresh air cannot be fully mixed in the resonance box, resulting in unstable combustion of the mixed gas in the engine cylinder, which will also cause large fluctuations in the exhaust gas pressure discharged from each cylinder of the engine, and due to the inconsistent length of the exhaust manifold, the pressure fluctuation of the exhaust gas entering the catalyst from the engine cylinder is large, resulting in unstable flow of the exhaust gas after entering the EGR pipeline, and then causing the exhaust gas to enter the intake manifold and mix unevenly with the fresh air, which will eventually affect the stability of the combustion of the mixed gas in the engine cylinder again.

[0051] Based on this, the present application provides a vehicle, which may be a fuel vehicle, a hybrid vehicle, or the like.

[0052] For ease of understanding, the vehicle provided in this application is described in detail below with reference to the accompanying drawings.

[0053] The vehicle includes a powertrain, which includes an engine block (not shown) and an exhaust gas recirculation system. Figure 1 is a schematic structural diagram of an exhaust gas recirculation system according to an exemplary embodiment. Figure 2 is a schematic diagram of an air extraction sleeve according to an exemplary embodiment. Figure 1 and Figure 2 As shown, the exhaust gas recirculation system includes a catalyst 1, an intake manifold 2, an exhaust gas pipe 3, an air intake sleeve 4 and an air intake pipe 5. The air inlet of the catalyst 1 is connected to the air outlet of the engine cylinder to receive the exhaust gas generated by the engine cylinder. After the exhaust gas enters the catalyst 1, it will be divided into two paths. One path flows through the catalyst 1 and is discharged from the air outlet of the catalyst 1, and the other path enters the exhaust gas pipe 3.

[0054] Specifically, such as Figure 2 As shown, a mounting channel 41 is formed in the air extraction sleeve 4 , and the catalyst 1 passes through the mounting channel 41 and is fixedly connected to the mounting channel 41 , that is, part of the catalyst 1 is located in the mounting channel 41 .

[0055] A closed air intake chamber 411 is formed in the side wall of the installation channel 41, and the air intake pipe 5 is arranged on the side wall of the installation channel 41, and one end of the air intake pipe 5 is connected to the air intake chamber 411, and the other end of the air intake pipe 5 is connected to the interior of the catalyst 1. The other exhaust gas in the catalyst 1 will enter the air intake chamber 411 through the air intake pipe 5 and be buffered in the air intake chamber 411.

[0056] The air inlet of the exhaust gas pipe 3 is connected to the air intake chamber 411, and the air outlet of the exhaust gas pipe 3 is connected to the intake manifold 2. The exhaust gas buffered in the air intake chamber 411 can enter the exhaust gas pipe 3, and enter the intake manifold 2 after flowing through the exhaust gas pipe 3. At the same time, the intake manifold 2 is connected to the throttle valve and the engine cylinder. The fresh air from the outside will enter the intake manifold 2 through the throttle valve, so that the fresh air will be mixed with the exhaust gas in the intake manifold 2. The mixed gas flows through the intake manifold 2 and enters the engine cylinder for combustion.

[0057] By setting up the air intake chamber 411 and the air intake pipe 5, the exhaust gas in the catalyst 1 can be first buffered in the air intake chamber 411 before entering the exhaust gas pipe 3. During this process, the exhaust gas with unstable pressure entering the catalyst 1 will be fully mixed when entering the air intake chamber 411, so that the pressure of the mixed exhaust gas is in a relatively stable state, so that the exhaust gas pressure fluctuation in the air intake chamber 411 is small, and the pressure fluctuation after the exhaust gas enters the exhaust gas pipe 3 is also small. Therefore, the flow process of the exhaust gas in the exhaust gas pipe 3 is relatively stable and smooth, so that the exhaust gas can be relatively stable after entering the intake manifold 2, thereby facilitating the exhaust gas and fresh air to be mixed more evenly in the intake manifold 2, and then the mixed gas can be burned more stably and fully after entering the engine cylinder.

[0058] Among them, the catalyst 1 includes a first pipe 11, a first-stage catalyst 12, a second-stage catalyst 13, a second pipe 14 and a connecting pipe 15. One end of the first pipe 11 is connected to the air outlet of the engine cylinder, and the other end of the first pipe 11 is connected to the air inlet of the first-stage catalyst 12, which is used to guide the exhaust gas generated by the engine cylinder to the first-stage catalyst 12. The first-stage catalyst 12 is used for the exhaust gas generated by the engine cylinder and performs initial purification on the exhaust gas it receives.

[0059] The secondary catalyst 13 is arranged on the outlet side of the primary catalyst 12, and the connecting pipe 15 is connected between the primary catalyst 12 and the secondary catalyst 13, and connects the outlet of the primary catalyst 12 and the inlet of the secondary catalyst 13. The exhaust gas after purification by the primary catalyst 12 will enter the secondary catalyst 13 through the connecting pipe 15. The secondary catalyst 13 is used to purify the exhaust gas entering it again.

[0060] One end of the second pipe 14 is connected to the air outlet of the secondary catalyst 13 , and the other end of the second pipe 14 is connected to the outside. The exhaust gas purified by the secondary catalyst 13 flows through the second pipe 14 and is discharged to the outside.

[0061] In order to facilitate the arrangement of the air intake sleeve 4 and the catalyst 1 in the engine compartment, as well as the processing of the air intake sleeve 4 and the connection between the air intake sleeve 4 and the catalyst 1, as shown in FIG. Figure 1 and Figure 2As shown, the air intake sleeve 4 can be mounted on the connecting pipe 15, that is, the connecting pipe 15 of the catalyst 1 is passed through the installation channel 41, and one end of the air intake pipe 5 is connected to the air intake chamber 411, and the other end of the air intake pipe 5 is connected to the connecting pipe 15, thereby connecting to the interior of the catalyst 1.

[0062] When the exhaust gas in the catalyst 1 flows from the primary catalyst 12 to the secondary catalyst 13 , part of the exhaust gas will be diverted to the air intake chamber 411 through the air intake pipe 5 , and then flow through the exhaust pipe 3 into the intake manifold 2 to mix with fresh air.

[0063] The connecting pipe 15 can be connected to the first-stage catalyst 12 and the second-stage catalyst 13 by welding, screwing, interference fit, etc., and the air intake sleeve 4 is placed on the connecting pipe 15. At the same time, the connecting pipe 15 is connected to the first-stage catalyst 12 and the second-stage catalyst 13, and the air intake chamber 411 in the air intake sleeve 4 can be connected with the inside of the catalyst 1, which facilitates the connection between the air intake sleeve 4 and the catalyst 1, and also facilitates the arrangement of the air intake sleeve 4 and the catalyst 1 in the cabin, reducing the space occupied by the air intake sleeve 4.

[0064] The air extraction sleeve 4 may be an integral structure with the connecting pipe 15 , or may be fixedly connected to the connecting pipe 15 by welding or other methods.

[0065] On this basis, in order to facilitate the control of the temperature and amount of the exhaust gas entering the intake manifold 2 through the pipeline, as shown in FIG. Figure 1 As shown, the exhaust gas pipeline 3 includes an EGR intake pipe 31, an EGR cooler 32, an EGR valve 33 and an EGR outlet pipe 34. The air inlet of the EGR intake pipe 31 is connected to the air intake chamber 411, and the air outlet of the EGR intake pipe 31 is connected to the air inlet of the EGR cooler 32. The exhaust gas buffered in the air intake chamber 411 will enter the EGR intake pipe 31, and enter the EGR cooler 32 after flowing through the EGR intake pipe 31. The EGR cooler 32 cools down the exhaust gas entering it to avoid the exhaust gas temperature being too high, which will cause the temperature of the mixed gas after the exhaust gas and fresh air are mixed to be too high, thereby preventing the mixed gas from entering the engine cylinder and causing detonation of the engine cylinder.

[0066] The outlet of the EGR cooler 32 is connected to the inlet of the EGR valve 33, and the outlet of the EGR valve 33 is connected to the inlet of the EGR exhaust pipe. The exhaust gas from the EGR cooler 32 enters the EGR outlet pipe 34 through the EGR valve 33, and the outlet of the EGR outlet pipe 34 is connected to the intake manifold 2, so as to allow the exhaust gas therein to enter the intake manifold 2. The EGR valve 33 is used to control the amount of exhaust gas entering the EGR outlet pipe 34, thereby controlling the amount of exhaust gas entering the intake manifold 2.

[0067] In some embodiments, in order to ensure that the exhaust gas entering the catalyst 1 can enter the air intake chamber 411 in a balanced manner, the interior of the catalyst 1 can be divided into two areas according to the exhaust gas pressure distribution inside the catalyst 1, and the number of air intake pipes 5 connecting the corresponding areas can be set according to the exhaust gas pressure of the two areas. Specifically, Figure 3 FIG. 1 is a cross-sectional schematic diagram of an air extraction sleeve according to an exemplary embodiment. Figure 2 and Figure 3 As shown, the interior of the catalyst 1 has an air flow channel for exhaust gas circulation, that is, a channel formed by the first pipe 11, the first-stage catalyst 12, the connecting pipe 15, the second-stage catalyst 13 and the second pipe 14 being connected in sequence.

[0068] One end of the air intake pipe 5 is connected to the air intake chamber 411, and the air flow channel is connected to the other end of the air intake pipe 5. The air flow channel includes a first area and a second area. The exhaust gas pressure in the first area is greater than the exhaust gas pressure in the second area, that is, the air flow channel is divided into a first area and a second area according to the size of the exhaust gas pressure at each point in the air flow channel, wherein the first area is an area with higher exhaust gas pressure, and the second area is an area with lower exhaust gas pressure.

[0069] On this basis, the number of air intake pipes 5 can be set to multiple, a part of the multiple air intake pipes 5 connects the air intake chamber 411 with the first area, and the other part connects the air intake chamber 411 with the second area, and the number of air intake pipes 5 connecting the air intake chamber 411 and the first area is greater than the number of air intake pipes 5 connecting the air intake chamber 411 and the second area.

[0070] In this way, the amount of exhaust gas entering the air intake chamber 411 from the first area can be larger, while the amount of exhaust gas entering the air intake chamber 411 from the second area can be smaller. In addition, the exhaust gas from the first area with higher pressure enters the air intake chamber 411 through multiple air intake pipes 5, which can relieve the exhaust gas pressure after the exhaust gas enters the air intake chamber 411, thereby facilitating the rapid and sufficient mixing of the exhaust gas entering the air intake chamber 411 from the first area and the exhaust gas entering the air intake chamber 411 from the second area, thereby facilitating the exhaust gas to be relatively stable after entering the exhaust pipe 3.

[0071] Among them, the division of the first area and the second area can be divided along the axial direction of the installation channel 41, or around the axis of the installation channel 41. Multiple air extraction pipes 5 can be distributed irregularly, or arranged along the axial direction of the installation channel 41, or around the axis of the installation channel 41.

[0072] Normally, in order to facilitate the gas distribution around the axis of the air flow channel to enter the air intake chamber 411 in a balanced manner, as shown in FIG. Figure 2 and Figure 3As shown, the first area and the second area can be arranged around the axis of the installation channel 41, and multiple air intake pipes 5 can be arranged at intervals around the axis of the installation channel 41. In this way, the exhaust gas within the range of the air flow channel around its axis can enter the air intake chamber 411 through the air intake pipe 5, thereby further making the exhaust gas in the air flow channel enter the air intake chamber 411 in a balanced manner.

[0073] Exemplarily, the number of air intake pipes 5 can be 5-10, and the specific number of air intake pipes 5 can be 7, of which the number connecting the first area and the air intake chamber 411 can be 5, and the number connecting the second area and the air intake chamber 411 can be 2. The number of air intake pipes 5 can also be 9, of which the number connecting the first area and the air intake chamber 411 can be 6, and the number connecting the second area and the air intake chamber 411 can be 3.

[0074] In addition, in order to ensure the fluidity of exhaust gas in the air intake pipe 5, the inner diameter of the air intake pipe 5 can be greater than or equal to 2 mm and less than or equal to 4 mm. For example, the inner diameter of the air intake pipe 5 can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc.

[0075] In some embodiments, in order to ensure that the air intake sleeve 4 occupies a smaller cabin space, the volume of the air intake chamber 411 is increased so that the exhaust gas entering the air intake chamber 411 can be quickly and fully mixed. Figure 2 and Figure 3 As shown, the air extraction chamber 411 can be extended around the axis of the installation channel 41 to form an annular closed chamber, thereby increasing the volume of the air extraction chamber 411 as much as possible without changing the volume of the air extraction sleeve 4.

[0076] Along the radial direction of the air extraction chamber 411, the size of the air extraction chamber 411 (eg Figure 2 The thickness H) shown in FIG is greater than or equal to 5.5 mm and less than or equal to 8 mm. For example, the size of the air extraction chamber 411 can be 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, etc. In this way, the radial size of the air extraction chamber 411 can be increased as much as possible, further ensuring the volume of the air extraction chamber 411.

[0077] In addition, the air intake chamber 411 is an annular closed chamber, which, when filled with gas, can insulate the catalyst 1, thereby reducing the heat radiated outward from the air intake sleeve 4 of the catalyst 1, and further protecting the components near the catalyst 1.

[0078] In addition, the air intake chamber 411 is an annular closed chamber, and the EGR air intake pipe 31 in the exhaust gas pipe 3 can also be connected to any position on the extended circumference of the air intake chamber 411, thereby facilitating the arrangement of the EGR air intake pipe 31 in the cabin, so as to effectively and reasonably utilize the space in the cabin.

[0079] In some embodiments, as Figure 1 As shown, the intake manifold 2 includes an intake pipe 21, a mixing pipe 22 and a resonance chamber 23. One end of the intake pipe 21 is used to connect with the throttle valve so that fresh air from the outside enters the intake pipe 21 through the throttle valve.

[0080] The intake end of the mixing duct 22 is connected to the other end of the intake duct 21, allowing fresh air in the intake duct 21 to enter the mixing duct 22. Furthermore, the outlet of the exhaust pipe 3 is connected to the intake manifold 2. Specifically, the outlet of the EGR outlet pipe 34 of the exhaust pipe 3 is connected to the intake end of the mixing duct 22. As fresh air enters the mixing duct 22 through the intake duct 21, exhaust gas from the EGR outlet pipe 34 also enters the mixing duct 22, causing the fresh air and exhaust gas to contact and mix within the mixing duct 22.

[0081] The air inlet end of the resonance chamber 23 is connected to the air outlet end of the mixing pipe 22, and the air outlet end of the resonance chamber 23 is connected to the engine cylinder, so that the mixed gas in the mixing pipe 22 can flow through the resonance chamber 23 and then enter the engine cylinder for combustion.

[0082] Due to the limitation of the space in the cabin, when the exhaust pipe 3 is set after the throttle valve, the EGR outlet pipe 34 and the intake pipe 21 are usually set relative to each other, that is, Figure 1 As shown in FIG, the exhaust gas entering the mixing pipe 22 from the EGR outlet pipe 34 flows toward the intake pipe 21. In addition, the outlet end of the resonance chamber 23 is arranged on a side adjacent to the side where the resonance chamber 23 is connected to the mixing pipe 22.

[0083] For example, the mixing duct 22 is connected to the left side of the resonance chamber 23, the outlet end of the resonance chamber 23 is located at the rear side of the resonance chamber 23, and the intake duct 21 is connected to the rear side of the mixing duct 22, and the EGR outlet pipe 34 is connected to the front side of the mixing duct 22.

[0084] The air intake pipe 21 is relatively close to the air outlet end of the resonance chamber 23, and the flow direction of the exhaust gas is also relatively close to the air outlet end of the resonance chamber 23. Therefore, the exhaust gas entering the mixing pipe 22 flows toward the air intake pipe 21 and mixes with the fresh air. It will quickly flow out from the air outlet end of the resonance chamber 23, thereby reducing the mixing path of the exhaust gas and the fresh air, which will affect the uniformity of the mixing of the two.

[0085] In addition, the outlet end of the resonance chamber 23 is connected to four mixed gas outlet pipes 24, and the four mixed gas outlet pipes 24 are arranged at intervals in the direction away from the mixing pipe 22. The four mixed gas outlet pipes 24 correspond one-to-one to the four cylinder bodies of the engine cylinder. One mixed gas outlet pipe 24 is connected to one cylinder body, and is used to guide the mixed gas in the resonance chamber 23 to the corresponding cylinder body.

[0086] In this way, after the exhaust gas and fresh air are mixed and flow quickly to the outlet end of the resonance chamber 23, most of the mixed gas will first enter a mixed gas outlet pipe 24 close to the mixing pipe 22, resulting in a smaller amount of mixed gas entering the mixed gas outlet pipe 24 far away from the mixing pipe 22. This will cause uneven intake volume in each cylinder of the engine cylinder, resulting in uneven combustion of the gas in each cylinder, and even detonation.

[0087] Based on this, Figure 4 is a schematic structural diagram of a flow guide pipe according to an exemplary embodiment. Figure 1 and Figure 4 As shown, the exhaust gas recirculation system also includes a guide pipe 6, a first end of the guide pipe 6 is connected to the outlet of the EGR outlet pipe 34 of the exhaust pipe 3, and a second end of the guide pipe 6 extends into the interior of the mixing pipe 22. The end of the second end of the guide pipe 6 is closed and opposite to the intake pipe 21; an outlet hole 61 is opened on the side wall of the guide pipe 6, and the outlet hole 61 is located inside the mixing pipe 22 and connects the guide pipe 6 and the mixing pipe 22. The exhaust gas in the EGR outlet pipe 34 first enters the guide pipe 6 before entering the mixing pipe 22, and flows out into the mixing pipe 22 through the outlet hole 61 of the guide pipe 6. Since the outlet hole 61 is arranged on the side wall of the guide pipe 6 and the end of the second end of the guide pipe 6 is closed, the exhaust gas entering the mixing pipe 22 can be prevented from flowing toward the intake pipe 21, so as to prevent the exhaust gas entering the mixing pipe 22 from flowing quickly to the outlet end of the resonance chamber 23 without being fully mixed with the fresh air, so that the exhaust gas entering the mixing pipe 22 and the fresh air can be mixed in the mixing pipe 22 and the resonance chamber 23, so as to increase the mixing path of the exhaust gas and the fresh air, so that the two are mixed more fully.

[0088] Moreover, after the exhaust gas is mixed with the fresh air, it enters each mixed gas outlet pipe 24 from the resonance chamber 23, which enables the mixed gas to enter each mixed gas outlet pipe 24 relatively evenly, thereby avoiding uneven gas entering each cylinder body of the engine cylinder, which affects the combustion of the gas in each cylinder body.

[0089] On this basis, Figure 5 is a schematic cross-sectional view of a flow guide pipe according to an exemplary embodiment. Figure 4 and Figure 5As shown, the number of the air outlet holes 61 can be two, the extension direction of one air outlet hole 61 is perpendicular to the extension direction of the air inlet pipe 21, and the extension direction of the other air outlet hole 61 is consistent with the extension direction of the mixing pipe 22 and faces the resonance chamber 23.

[0090] The two air outlets 61 can be named the first air outlet 611 and the second air outlet 612 respectively, wherein the extension direction of the first air outlet 611 can be perpendicular to the extension direction of the air intake pipe 21, and the extension direction of the second air outlet 612 can be consistent with the extension direction of the mixing pipe 22 and toward the resonance chamber 23.

[0091] The exhaust gas flowing out of the first air outlet 611 flows away from the air outlet end of the resonance chamber 23, and can quickly intersect with the fresh air flowing out of the intake pipe 21 through convection, thereby quickly mixing the fresh air and exhaust gas, thereby improving the mixing efficiency and uniformity of the fresh air and exhaust gas.

[0092] The second air outlet 612 can make the exhaust gas flow quickly into the resonance chamber 23, and the exhaust gas flowing out of the first air outlet 611 and the fresh air will also flow into the resonance chamber 23 after mixing, thereby mixing with the exhaust gas flowing out of the second air outlet 612 in the resonance chamber 23, thereby increasing the mixing path of the fresh air and the exhaust gas, making the mixing of the two more sufficient and uniform.

[0093] In addition, the combination of the air intake chamber 411 and the air intake pipe 5 makes the pressure of the exhaust gas in the catalyst 1 relatively stable after entering the mixing pipe 22, so that the fresh air and exhaust gas can be mixed more fully and more stably to enter the engine cylinder for combustion, thereby ensuring the stability of the combustion of the mixed gas in the engine cylinder.

[0094] The length of the diversion pipe 6 may be greater than or equal to 35 mm and less than or equal to 40 mm. For example, the length of the diversion pipe 6 may be 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, etc.

[0095] The length of the portion of the guide pipe 6 extending into the mixing pipe 22 is greater than or equal to 15 mm and less than or equal to 19 mm. For example, the length of the portion of the guide pipe 6 extending into the mixing pipe 22 can be 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, etc.

[0096] The inner diameter of the diversion pipe 6 is greater than or equal to 8 mm and less than or equal to 10 mm. For example, the inner diameter of the diversion pipe 6 can be 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, etc.

[0097] The diameter of the air outlet hole 61 is greater than or equal to 6.5 mm and less than or equal to 8.5 mm. For example, the diameter of the air outlet hole 61 can be 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, etc.

[0098] By setting the guide duct 6 and the air outlet 61 according to the above-mentioned dimensions, the guide duct 6 can occupy a more appropriate space in the cabin while ensuring that the exhaust gas flows into the mixing duct 22 more stably.

[0099] In order to increase the smoothness of the flow of fresh air into the mixing duct 22, as shown in FIG. Figure 1 As shown, the angle between the extending direction of the intake duct 21 and the extending direction of the mixing duct 22 can be made Figure 1 The angle α shown in FIG is greater than 90° and less than 180°.

[0100] For example, the angle formed between the extension direction of the intake duct 21 and the extension direction of the mixing duct 22 can be 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0101] The angle formed between the extension direction of the intake duct 21 and the extension direction of the mixing duct 22 is within the above-mentioned angle range, which can reduce the resistance to the flow of fresh air at the connection between the intake duct 21 and the mixing duct 22, so that the fresh air entering the intake duct 21 can enter the mixing duct 22 more smoothly.

[0102] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An exhaust gas recirculation system, characterized in that: include: A catalyst (1), the catalyst (1) being used to receive exhaust gas generated by an engine cylinder; An intake manifold (2), the intake manifold (2) being used to connect the throttle valve and the engine cylinder; an exhaust gas pipeline (3), wherein an outlet of the exhaust gas pipeline (3) is in communication with the intake manifold (2); An air intake sleeve (4), wherein a mounting channel (41) is formed in the air intake sleeve (4), the catalyst (1) passes through the mounting channel (41) and is fixedly connected to the mounting channel (41), and a closed air intake chamber (411) is formed in the side wall of the mounting channel (41); the air inlet of the exhaust gas pipeline (3) is in communication with the air intake chamber (411); An air intake pipe (5), wherein the air intake pipe (5) is multiple, and the multiple air intake pipes (5) are arranged at intervals around the axis of the installation channel (41); The catalyst (1) comprises: a first-stage catalyst (12), the first-stage catalyst (12) being used to receive the exhaust gas generated by the engine cylinder and perform primary purification on the exhaust gas; A secondary catalyst (13), the secondary catalyst (13) being arranged on the outlet side of the primary catalyst (12) and used for re-processing and discharging the exhaust gas processed by the primary catalyst (12); A connecting pipe (15) is connected between the first-stage catalyst (12) and the second-stage catalyst (13), and is in communication with the air outlet of the first-stage catalyst (12) and the air inlet of the second-stage catalyst (13). The air extraction sleeve (4) is sleeved on the connecting pipe (15). The connecting pipe (15) is passed through the installation channel (41), and one end of the air extraction pipe (5) is in communication with the air extraction chamber (411). The other end of the air extraction pipe (5) is in communication with the connecting pipe (15), thereby being in communication with the interior of the catalyst (1).

2. The exhaust gas recirculation system according to claim 1, characterized in that The intake manifold (2) comprises: An air intake pipe (21), one end of the air intake pipe (21) being connected to a throttle valve; a mixing pipe (22), wherein an air inlet end of the mixing pipe (22) is connected to the other end of the air inlet pipe (21); a resonance chamber (23), wherein the air inlet end of the resonance chamber (23) is connected to the air outlet end of the mixing pipe (22), and the air outlet end of the resonance chamber (23) is used to be connected to the engine cylinder; The exhaust gas recirculation system further comprises a guide pipe (6), a first end of the guide pipe (6) being in communication with the air outlet of the exhaust gas pipeline (3), a second end of the guide pipe (6) extending into the interior of the mixing pipe (22), an end portion of the second end of the guide pipe (6) being closed and opposite to the air intake pipe (21); an air outlet hole (61) is formed on a side wall of the guide pipe (6), the air outlet hole (61) being located inside the mixing pipe (22) and connecting the guide pipe (6) and the mixing pipe (22).

3. The exhaust gas recirculation system according to claim 2, characterized in that: There are two air outlet holes (61), the extension direction of one air outlet hole (61) is perpendicular to the extension direction of the air inlet pipe (21), and the extension direction of the other air outlet hole (61) is consistent with the extension direction of the mixing pipe (22) and faces the resonance chamber (23).

4. The exhaust gas recirculation system according to claim 3, characterized in that: The angle formed between the extension direction of the air intake duct (21) and the extension direction of the mixing duct (22) is greater than 90° and less than 180°.

5. The exhaust gas recirculation system according to claim 1, characterized in that The air extraction chamber (411) extends around the axis of the installation channel (41), and along the radial direction of the air extraction chamber (411), the size of the air extraction chamber (411) is greater than or equal to 5.5 mm and less than or equal to 8 mm.

6. A powertrain, characterized in that: include: The exhaust gas recirculation system according to any one of claims 1 to 5; An engine cylinder, wherein the air inlet of the engine cylinder is connected to the air outlet end of the intake manifold (2), and the air outlet of the engine cylinder is connected to the air inlet of the catalyst (1).

7. A vehicle, characterized in that: Comprising the powertrain as claimed in claim 6.

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