Engine and integrated air inlet system thereof

Abstract

The utility model discloses an integrated air inlet system of an engine. The integrated air inlet system comprises an air inlet pipe, an EGR cooler mounting base and an EGR cooler. The gas inlet pipe is provided with a gas outlet, an air inlet and a waste gas channel; an EGR mixing cavity and an air inlet pressure stabilizing cavity are formed in the air inlet pipe. An outlet of the EGR mixing cavity communicates with an inlet of the air inlet pressure stabilizing cavity. The air inlet is communicated with an inlet of the EGR mixing cavity; an inlet of the waste gas channel is used for introducing waste gas; an outlet of the air inlet pressure stabilizing cavity is communicated with the air outlet; an EGR pre-cooling gas outlet communicated with an outlet of the waste gas channel and an EGR post-cooling gas inlet communicated with the EGR mixing cavity are formed in the EGR cooler mounting seat; and the exhaust gas inlet of the EGR cooler is in butt joint communication with the EGR pre-cooling gas outlet, and the exhaust gas outlet of the EGR cooler is in butt joint communication with the EGR post-cooling gas inlet, so that the problem of large EGR resistance caused by the EGR gas outlet pipe is prevented. The utility model further discloses an engine.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, and more specifically, to an integrated air intake system of an engine and also to an engine. Background Art

[0002] The engine's intake system includes an EGR (Exhaust Gas Re-circulation) route, which can lead part of the engine's exhaust gas back into the engine's cylinders and mix it with the engine's fresh intake air to improve engine efficiency, improve the combustion environment, reduce engine load, and reduce NO x Products that reduce the emission of compounds, knock and extend the service life of various components.

[0003] See also Figure 1 The air intake system of the engine includes an intake pipe 04, an intake pipe 03 connected to the intake pipe 04, and an EGR route connected to the intake pipe 04; the intake pipe 03 is supported by an intake pipe bracket 02, and an intake throttle valve 01 is provided on the intake pipe 03; the EGR route includes an EGR cooler 08 and an EGR outlet pipe 05; the EGR cooler 08 is supported by an EGR cooler bracket 09, and its exhaust gas outlet is connected to the intake pipe 04 through the above-mentioned EGR outlet pipe 05, the EGR outlet pipe 05 is supported by an EGR outlet pipe bracket 07, and an EGR cold-after temperature sensor 06 is provided on the EGR outlet pipe 05. The exhaust gas inlet of the EGR cooler 08 is connected to the EGR valve 011; the EGR cooler 08 is connected to the circulating cooling water through the EGR cooler outlet pipe 010 and the EGR cooler inlet pipe 012 connected thereto; the EGR valve 011 is connected to the circulating cooling water through the EGR valve inlet pipe 013 and the EGR valve outlet pipe 014.

[0004] However, in the above-mentioned intake system, the EGR cooler 08 in the EGR route is connected to the intake pipe 04 through the EGR outlet pipe 05. The EGR outlet pipe 05 is long and has bends, resulting in large EGR resistance and difficulty in increasing the EGR rate.

[0005] Therefore, how to solve the problem in the prior art that the EGR resistance is large due to the EGR outlet pipe, which makes it difficult to increase the EGR rate, is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the utility model provides an integrated air intake system of an engine, wherein an EGR cooler mounting seat is integrated on the air intake pipe, and the EGR cooler is assembled on the EGR cooler mounting seat through a fixing member, so as to avoid setting an EGR outlet pipe between the exhaust gas outlet of the EGR cooler and the air intake pipe, thereby preventing the generation of large EGR resistance due to the EGR outlet pipe and reducing the difficulty of improving the EGR rate. The utility model also provides an engine using the above integrated air intake system, which is convenient for improving the EGR rate.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] An integrated air intake system for an engine, comprising:

[0009] An intake pipe, wherein the intake pipe is provided with an air outlet, an air inlet and an exhaust gas channel; an EGR mixing chamber and an intake pressure stabilizing chamber are provided inside the intake pipe; the outlet of the EGR mixing chamber is communicated with the inlet of the intake pressure stabilizing chamber; the air inlet is communicated with the inlet of the EGR mixing chamber; the inlet of the exhaust gas channel is used to receive exhaust gas; the outlet of the intake pressure stabilizing chamber is communicated with the air outlet;

[0010] An EGR cooler mounting seat, the EGR cooler mounting seat is integrated with the intake pipe, and the EGR cooler mounting seat is provided with an EGR cold front gas outlet and an EGR cold rear gas inlet; the EGR cold front gas outlet is communicated with the outlet of the exhaust gas passage, and the EGR cold rear gas inlet is communicated with the EGR mixing chamber;

[0011] EGR cooler, the EGR cooler is assembled on the EGR cooler mounting seat through a fixing part, the exhaust gas inlet of the EGR cooler is connected with the EGR front-cooling gas outlet, and the exhaust gas outlet of the EGR cooler is connected with the EGR rear-cooling gas inlet.

[0012] Optionally, in the above integrated air intake system, an EGR valve mounting seat is integrated on the air intake pipe and located between the EGR cold post-gas inlet and the EGR mixing chamber; the EGR valve mounting seat is installed with an EGR valve;

[0013] The intake pipe has a first connecting passage for connecting the valve core of the EGR valve with the EGR cold gas inlet, and a second connecting passage for connecting the valve core of the EGR valve with the EGR mixing chamber.

[0014] Optionally, in the above integrated air intake system, the EGR mixing chamber is axially connected to the air inlet;

[0015] The EGR mixing chamber has an exhaust gas inlet in the circumference thereof, and the exhaust gas inlet is communicated with the second connecting passage.

[0016] Optionally, in the above integrated air intake system, a partition plate is provided in the EGR mixing chamber.

[0017] The partition plate has a notch along the circumferential direction, the notch forms the exhaust gas inlet, and the axial channel surrounded by the partition plate forms the air inlet.

[0018] Optionally, in the above-mentioned integrated intake system, the partition plate is connected to the cavity wall of the EGR mixing chamber, and a gas channel is formed between the partition plate and the cavity wall of the EGR mixing chamber, and the exhaust gas inlet and the second connecting channel are connected through the gas channel.

[0019] Optionally, in the above integrated air intake system, there are multiple second connecting channels, and all of them are connected to the gas channel.

[0020] Optionally, in the above-mentioned integrated air intake system, an EGR bypass valve mounting seat is integrated on the air intake pipe, and an EGR bypass valve is mounted on the EGR bypass valve mounting seat; and a mounting through hole for connecting the EGR bypass valve with the exhaust gas channel is provided on the air intake pipe;

[0021] The mounting through hole connects the exhaust gas channel and the first connecting channel; the inlet of the EGR bypass valve connects the exhaust gas channel, one outlet of the EGR bypass valve connects to the EGR cold front gas outlet, and the other outlet of the EGR bypass valve connects to the first connecting channel.

[0022] Optionally, in the above-mentioned integrated air intake system, a first detection hole connected to the first connecting channel is integrated on the air intake pipe, and a first sensor is installed in the first detection hole, and the first sensor is used to detect the gas temperature at the first connecting channel.

[0023] Optionally, in the above-mentioned integrated air intake system, a thermostat interface is integrated on the air intake pipe;

[0024] and / or,

[0025] The air intake pipe is integrated with a second detection hole connected with the air intake pressure stabilizing chamber, and the second detection hole is installed with a second sensor, and the second sensor is used to detect the temperature and pressure of the gas in the air intake pressure stabilizing chamber.

[0026] An engine comprises an air intake system, wherein the air intake system is an integrated air intake system as described in any one of the above technical solutions.

[0027] The utility model provides an integrated air intake system of an engine, comprising an intake pipe, an EGR cooler mounting seat and an EGR cooler; the intake pipe is provided with an air outlet, an air inlet and an exhaust gas channel; an EGR mixing chamber and an intake pressure stabilizing chamber are provided inside the intake pipe; the outlet of the EGR mixing chamber is connected with the inlet of the intake pressure stabilizing chamber; the air inlet is connected with the inlet of the EGR mixing chamber; the inlet of the exhaust gas channel is used to receive the exhaust gas; the outlet of the intake pressure stabilizing chamber is connected with the air outlet; the EGR cooler mounting seat is integrated in the intake pipe, and the EGR cooler mounting seat is provided with an EGR cooling front gas outlet and an EGR cooling rear gas inlet; the EGR cooling front gas outlet is connected with the outlet of the exhaust gas channel, and the EGR cooling rear gas inlet is connected with the EGR mixing chamber; the EGR cooler is assembled on the EGR cooler mounting seat through a fixing piece, and the exhaust gas inlet of the EGR cooler is butt-connected with the EGR cooling front gas outlet, and the exhaust gas outlet of the EGR cooler is butt-connected with the EGR cooling rear gas inlet.

[0028] In the integrated air intake system of the above-mentioned engine, an EGR cooler mounting seat is integrated on the air intake pipe, and the EGR cooler is assembled on the EGR cooler mounting seat through fixings, thereby avoiding the provision of an EGR outlet pipe between the exhaust gas outlet of the EGR cooler and the air intake pipe, preventing the generation of large EGR resistance due to the EGR outlet pipe, and reducing the difficulty of increasing the EGR rate.

[0029] The utility model also provides an engine using the integrated air intake system, which is convenient for improving the EGR rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of an intake system of an engine in the prior art;

[0032] Figure 2 It is a schematic diagram of the structure of the air intake pipe disclosed in the embodiment of the utility model;

[0033] Figure 3 It is a schematic structural diagram of the air intake pipe in another direction disclosed in the embodiment of the utility model;

[0034] Figure 4 It is a front view of the air intake pipe disclosed in the embodiment of the utility model;

[0035] Figure 5 for Figure 4Schematic diagram of the structure in the AA direction;

[0036] Figure 6 It is a partial structural schematic diagram of the air intake pipe disclosed in the embodiment of the utility model;

[0037] Figure 7 for Figure 6 Schematic diagram of the structure in the middle BB direction;

[0038] Figure 8 A gas flow diagram of an intake pipe disclosed in an embodiment of the utility model;

[0039] Fig. 9 It is a structural schematic diagram of the integrated air intake system disclosed in the embodiment of the utility model;

[0040] Fig.10 It is a structural schematic diagram of the EGR bypass valve 211 disclosed in the embodiment of the utility model;

[0041] Fig.11 It is a structural schematic diagram of another direction of the integrated air intake system disclosed in the embodiment of the utility model;

[0042] Fig.12 It is a cross-sectional view of the integrated air intake system disclosed in the embodiment of the utility model;

[0043] Fig.13 Another positional cross-sectional view of the integrated air intake system disclosed in the embodiment of the utility model;

[0044] Fig.14 A schematic diagram of the connection of the second connecting channel disclosed in the embodiment of the utility model;

[0045] in, Figure 2-Figure 14 middle:

[0046] EGR valve core hole 1; EGR valve mounting seat 2; EGR mixing chamber 3; intake pipe mounting seat 4; first mounting surface 5; second detection hole 6; EGR cooler mounting seat 7; EGR cold rear gas inlet 8; EGR cold front gas outlet 9; EGR bypass valve mounting seat 10; mounting through hole 11; first detection hole 12; exhaust gas channel 13; first gas outlet 14; second gas outlet 15; intake manifold mounting surface 16; thermostat interface 17; reinforcing rib 18; partition plate 19; intake pressure stabilizing chamber 20; first connecting channel 21; second connecting channel 22; gas channel 23;

[0047] EGR valve 201; EGR valve disc 2011; EGR valve stem 2012; EGR valve channel 2013; intake pipe 202; intake throttle valve 203; intake pipe 204; EGR cooler 205; EGR water inlet pipe 206; EGR water inlet temperature sensor 207; EGR water outlet pipe 208; EGR water outlet pipe temperature sensor 209; EGR bypass valve connector 210; EGR bypass valve 211; EGR bypass valve disc 2111; EGR cold after temperature sensor 212; intake air temperature and pressure sensor 213. DETAILED DESCRIPTION

[0048] The utility model embodiment discloses an integrated air intake system of an engine, wherein an EGR cooler mounting seat is integrated on the air intake pipe, and the EGR cooler is assembled on the EGR cooler mounting seat through a fixing member, so as to avoid setting an EGR outlet pipe between the exhaust gas outlet of the EGR cooler and the air intake pipe, thereby preventing the generation of large EGR resistance due to the EGR outlet pipe and reducing the difficulty of improving the EGR rate. The utility model embodiment also provides an engine using the above integrated air intake system, which is convenient for improving the EGR rate.

[0049] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] See also Figure 2-14 The utility model provides an integrated air intake system of an engine, including an air intake pipe 204, an EGR cooler mounting seat 7 and an EGR cooler 205.

[0051] The intake pipe 204 is provided with an air outlet, an air inlet and an exhaust gas channel 13; the interior of the intake pipe 204 is provided with an EGR mixing chamber 3 and an intake pressure stabilizing chamber 20; the outlet of the EGR mixing chamber 3 is connected to the inlet of the intake pressure stabilizing chamber 20; the air inlet is connected to the inlet of the EGR mixing chamber 3; the inlet of the exhaust gas channel 13 is used to receive the exhaust gas; the outlet of the intake pressure stabilizing chamber 20 is connected to the outlet of the intake pipe 204; the outlet of the intake pipe 204 is connected to the cylinder head of the engine. The intake pressure stabilizing chamber 20 is used to store a certain amount of air to alleviate the problem of air grabbing between the cylinders of the engine caused by the interference of the resonance wave on the intake of each cylinder of the engine. The shape, size and position of the intake pressure stabilizing chamber 20 can be set according to different needs. The EGR mixing chamber 3 is used to mix the fresh intake air and the EGR exhaust gas to ensure the uniformity of the introduction of the EGR exhaust gas of each cylinder under various working conditions of the engine.

[0052] In some embodiments, the air outlet includes a first air outlet 14 and a second air outlet 15, and the first air outlet 14 and the second air outlet 15 are different types of air passages, including but not limited to, the first air outlet 14 is a spiral air passage, and the second air outlet is a straight passage. The spiral air passage can prolong the oil-gas mixing time, so that the oil-gas mixing effect is better; the straight passage can increase the air intake of the cylinder head. Those skilled in the art can set the number and type of air outlets according to different needs, and all are within the protection scope.

[0053] The EGR cooler mounting seat 7 is integrated into the intake pipe 204, and the EGR cooler mounting seat 7 is provided with an EGR cooling front gas outlet 9 and an EGR cooling rear gas inlet 8; the EGR cooling front gas outlet 9 is connected with the outlet of the exhaust gas channel 13, and the EGR cooling rear gas inlet 8 is connected with the EGR mixing chamber 3; the EGR cooler 205 is assembled on the EGR cooler mounting seat 7 through a fixing part, and the exhaust gas inlet of the EGR cooler 205 is connected with the EGR cooling front gas outlet 9, and the exhaust gas outlet of the EGR cooler 205 is connected with the EGR cooling rear gas inlet 8.

[0054] In the integrated air intake system of the above-mentioned engine, an EGR cooler mounting seat 7 is integrated on the air intake pipe 204, and the EGR cooler 205 is assembled on the EGR cooler mounting seat 7 through fixings, so as to avoid setting an EGR outlet pipe between the exhaust gas outlet of the EGR cooler 205 and the air intake pipe 204, prevent the generation of large EGR resistance due to the EGR outlet pipe, and reduce the difficulty of increasing the EGR rate.

[0055] In the existing intake system of the engine, such as Figure 1 As shown, the inlet and outlet ends of the EGR cooler 08 need to be connected to the upstream EGR valve 011 and the downstream EGR outlet pipe 05, respectively, and the connection requires seals and fasteners. In the integrated air intake system provided in this embodiment, the exhaust gas channel 13 is embedded in the air intake pipe 204, and the EGR cooler 205 is only connected to the EGR cooler mounting seat 7 on the air intake pipe 204, so there is only one connection point, which reduces the reliability risk and improves the simplicity of the structure, making the integrated air intake system compact and highly reliable.

[0056] In the integrated intake system disclosed in some embodiments, an EGR valve mounting seat 2 is also integrated on the intake pipe 204, and an EGR valve core hole 1 for the valve core of the EGR valve 201 to extend into is provided on the intake pipe 204. The EGR valve mounting seat 2 is mounted with the EGR valve 201, and during the installation of the EGR valve 201, the valve body of the EGR valve 201 is mounted on the EGR valve mounting seat 2, and the valve core of the EGR valve extends into the EGR valve core hole 1.

[0057] It should be noted that the EGR valve mounting seat 2 is located between the EGR cold gas inlet 8 and the EGR mixing chamber 3 .

[0058] like Figure 1 As shown, the air inlet and outlet of the conventional EGR valve 011 need to be connected to the upstream exhaust manifold and the downstream EGR cooler 08 respectively, and the connection requires seals and fasteners. In the integrated air intake system provided by the present invention, the air path of the EGR valve 201 is embedded in the intake pipe 204, and the EGR valve 201 is only connected to the EGR valve mounting seat 2, so there is only one connection point, which reduces the reliability risk and improves the simplicity of the structure.

[0059] Combination Figure 8 As shown, the intake pipe 204 has a first connecting passage 21 for connecting the valve core of the EGR valve 201 with the EGR cold gas inlet 8, and a second connecting passage 22 for connecting the valve core of the EGR valve 201 with the EGR mixing chamber 3. After the EGR valve 201 is installed, the EGR valve 201 can control the connection relationship between the first connecting passage 21 and the second connecting passage 22.

[0060] An EGR valve mounting seat 2 for mounting an EGR valve 201 is integrated on the intake pipe 204. The EGR valve 201 can be directly mounted on the intake pipe 204, and a first connecting channel 21 and a second connecting channel 22 are provided on the intake pipe 204. The first connecting channel 21 and the second connecting channel 22 enable the EGR cold gas inlet 8 to be connected to the EGR mixing chamber 3.

[0061] In combination with the above-mentioned arrangement, an exhaust gas channel 13, a first connecting channel 21 and a second connecting channel 22 are arranged on the intake pipe 204 in the present application, so that the exhaust gas can enter the first connecting channel 21 after passing through the EGR cooler 205 from the exhaust gas channel 13, and then enter the second connecting channel 22 after passing through the EGR valve 201, and then enter the EGR mixing chamber 3 with the air.

[0062] like Figure 1 In the conventional intake system shown, the EGR outlet pipe 05 needs to guide the EGR exhaust gas from the exhaust outlet of the EGR cooler 8 to the intake pipe 04, and the pipe is relatively long: the EGR outlet pipe 05 needs to be supported and fixed by the EGR outlet pipe bracket 07, and parts such as brackets and fasteners are added; the EGR outlet pipe 05 needs to be fastened and sealed by the front and rear connectors; the EGR outlet pipe 05 is exposed to the air, which will dissipate heat for the EGR exhaust gas, and the heat dissipation is related to the ambient temperature and has uncertainty, thus increasing the difficulty of engine control. In the integrated intake system provided by this embodiment, the EGR cooler 205 is assembled on the EGR cooler mounting seat 7 through a fixing part, eliminating the EGR outlet pipe, and there is no need to fix the EGR outlet pipe, and the path of the first connecting channel 21 between the exhaust outlet of the EGR cooler 205 and the EGR valve 201 is shorter, without heat dissipation, so that the temperature of the EGR exhaust gas led back can be controlled, and the performance accuracy of the engine is improved.

[0063] It should be noted that the first connecting channel 21 and the second connecting channel 22 are both channels opened on the intake pipe 204, that is, the first connecting channel 21 and the second connecting channel 22 are integrated on the intake pipe 204, thereby reducing the use of external pipes, further reducing the number of parts, and reducing the assembly of parts, making the structure more compact.

[0064] The shapes, sizes and opening positions of the first connection channel 21 and the second connection channel 22 can be set according to different needs and are all within the protection range. In some embodiments, the first connection channel 21 and the second connection channel 22 are arranged based on the principle of the shortest path.

[0065] Combination Figure 2 and Figure 3 as well as Figure 7 As shown, the EGR mixing chamber 3 in the present application has an air inlet in the axial direction. In some embodiments, the intake pipe 204 has an intake pipe mounting seat 4 for mounting the intake pipe 202, and the intake pipe mounting seat 4 has a through hole communicating with the intake pipe 202, and the through hole is communicated with the EGR mixing chamber 3.

[0066] In some embodiments, the through hole on the intake pipe mounting seat 4 serves as the air inlet of the EGR mixing chamber 3 , and the axial direction of the through hole serves as the axial direction of the EGR mixing chamber 3 .

[0067] In some embodiments, the EGR mixing chamber 3 has an exhaust gas inlet (not shown) in the circumference thereof, and the exhaust gas inlet is connected to the second connecting channel 22 to ensure that the exhaust gas in the second connecting channel 22 enters the EGR mixing chamber 3 through the exhaust gas inlet.

[0068] The exhaust gas inlet in the present application is arranged in the circumferential direction of the EGR mixing chamber 3, and the air inlet is arranged in the axial direction of the EGR mixing chamber 3, so that the axis of the exhaust gas inlet and the axis of the air inlet are arranged to intersect, which facilitates the exhaust gas to enter the EGR mixing chamber 3 with the flow of air.

[0069] Combination Figure 4 and Figure 7 As shown, a partition plate 19 is arranged in the EGR mixing chamber 3, and the partition plate 19 has a notch along the circumferential direction. The notch forms an exhaust gas inlet, and the axial channel surrounded by the partition plate 19 forms an air inlet.

[0070] In some embodiments, the partition plate 19 may be in the shape of a cylindrical structure, and a groove is provided on the circumferential side wall of the partition plate 19, where the groove forms an exhaust gas inlet, and the axial through hole of the cylindrical structure forms an air inlet. The size of the groove may be set according to different needs, and in some embodiments, the opening position of the groove may be set according to different needs, the number of the grooves includes but is not limited to three, and the grooves are distributed along the circumference of the partition plate 19, including but not limited to uniform distribution.

[0071] Figure 8 The partition plate 19 in the exhaust gas mixing chamber 3 is connected to the chamber wall of the EGR mixing chamber 3, and a gas passage 23 is formed between the partition plate 19 and the chamber wall of the EGR mixing chamber 3. The exhaust gas inlet and the second connecting passage 22 are communicated through the gas passage 23.

[0072] The EGR mixing chamber 3 is a cavity structure on the intake pipe 204, and a partition plate 19 is arranged at the inlet of the cavity structure, and the lower edge of the partition plate 19 has a flange facing the wall of the cavity structure, and the flange is connected to the wall of the cavity structure, and an annular gas channel 23 is formed between the flange of the partition plate 19, the partition plate 19 and the wall of the cavity structure.

[0073] In the present application, by adding the gas channel 23 , the exhaust gas can enter the EGR mixing chamber 3 after being buffered by the gas channel 23 , thereby reducing the impact on the air and ensuring that the air and the exhaust gas can smoothly enter the EGR mixing chamber 3 .

[0074] In some embodiments, there are multiple second connecting channels 22, and all of them are connected to the gas channel 23. The second connecting channels 22 include but are not limited to two, and are arranged in a Y shape and are connected to the gas channel 23, so that the exhaust gas can flow around the gas channel 23 and enter the EGR mixing chamber 3 from the exhaust gas inlet during the flow process.

[0075] Combination Figure 2 As shown, the intake pipe 204 disclosed in the present application is integrated with an EGR bypass valve mounting seat 10 , an EGR bypass valve 211 is mounted on the EGR bypass valve mounting seat 10 , and the intake pipe 204 has a mounting through hole 11 for connecting the EGR bypass valve 211 with the exhaust gas channel 13 .

[0076] The mounting through hole 11 is connected to the exhaust passage 13 and the first connecting passage 21. Specifically, the inlet of the EGR bypass valve 211 is connected to the exhaust passage 13, one outlet of the EGR bypass valve 211 is connected to the EGR cold front gas outlet 9, and the other outlet of the EGR bypass valve 211 is connected to the first connecting passage 21.

[0077] By integrating the EGR bypass valve mounting seat 10 on the intake pipe 204, the installation of the EGR bypass valve 211 can be facilitated, and the brackets required during the installation of the EGR bypass valve 211 are reduced, that is, the parts and the connections between the parts are reduced, making the structure more compact, occupying less space, and having higher reliability after connection.

[0078] It should be noted that in the present application, the EGR cooler mounting seat 7, the EGR valve mounting seat 2 and the EGR bypass valve mounting seat 10 are integrated on the intake pipe 204, and the first connecting channel 21 and the second connecting channel 22 are integrated on the intake pipe 204, thereby reducing the setting of the bracket and the pipeline, making the structure compact and the reliability after connection high. Since the structure of the intake pipe 204 is compact, it has strong adaptability and can be applied to different requirements, thereby increasing the adaptability of the product.

[0079] In some embodiments, a thermostat interface 17 is integrated on the air intake pipe 204. By providing the thermostat interface 17, the thermostat can be directly installed on the air intake pipe 204, thereby reducing the use of brackets during the thermostat installation process and further simplifying the structure.

[0080] The intake pipe is integrated with a first detection hole 12 connected to the first connecting channel. The first detection hole 12 is installed with a first sensor, which is used to detect the gas temperature at the first connecting channel 21. The first sensor is an EGR cold post temperature sensor 212.

[0081] In the traditional engine intake system, the EGR cold temperature sensor 06 is arranged on the EGR outlet pipe 05. Since the length of the EGR outlet pipe 05 is relatively long, the arrangement position of the EGR cold temperature sensor 06 has a greater impact on the measured value: when the arrangement position is close to the intake side of the EGR outlet pipe 05, its measured value cannot reflect the temperature of the EGR exhaust gas entering the intake pipe 04; when the arrangement position is close to the outlet side of the EGR outlet pipe 05, its measured value is far away from the EGR valve 011, and the control of the EGR valve 011 has a certain lag, which affects the performance control response timeliness of the whole machine. In the present application, the EGR cold temperature sensor 212 can accurately measure the temperature of the EGR exhaust gas in the intake pipe 204, and is closer to the EGR valve 201, with higher accuracy, and avoids the control lag of the EGR valve 201, ensuring the performance control response timeliness of the whole machine.

[0082] Combination Figure 6 and Figure 7 In the embodiment shown, the air intake pipe 204 is integrated with a second detection hole 6 which is connected to the pressure stabilizing chamber 20 and is used for a second sensor to extend into, wherein the second sensor is used to detect the temperature and / or pressure of the gas in the pressure stabilizing chamber 20 for performance calibration. The second sensor is an intake air temperature and pressure sensor 213.

[0083] In some embodiments, the air inlet pipe 204 has a first mounting surface 5, and the second sensor is used to be mounted on the first mounting surface 5. The shape and size of the first mounting surface 5 need to be adapted to the first sensor. After the second sensor is installed, the probe of the second sensor extends into the pressure stabilizing chamber 20 through the second detection hole 6 to detect the temperature and / or pressure in the pressure stabilizing chamber 20.

[0084] In the present application, the setting of the external pipeline is reduced, and the pipeline is integrated on the intake pipe 204, which reduces the gas flow, so that the control accuracy of EGR is high, and the EGR cold temperature measurement point is close to the EGR valve and the outlet, which can control EGR more accurately.

[0085] The air intake pipe 204 in the present application has an air intake manifold mounting surface 16 and a reinforcing rib 18 . The shape and size of the air intake pipe 204 can be set according to different needs and are all within the protection range. The air outlet of the air intake pipe 204 is opened on the air intake manifold mounting surface 16 .

[0086] The EGR valve 201 and the EGR cooler 205 are cooled by different cooling water circuits. The EGR cooler 205 is connected to the EGR water inlet pipe 206 and the EGR water outlet pipe 208; the EGR water inlet pipe 206 is provided with an EGR water inlet temperature sensor 207; the EGR water outlet pipe 208 is provided with an EGR water outlet temperature sensor 209.

[0087] Water temperature sensors are arranged at the inlet and outlet water of the EGR cooler 205 for strategic calculation and accurate calculation and control of the EGR cooling temperature. However, the traditional structure cannot achieve accurate monitoring of the water temperature because the water circuit of the EGR cooler is shared with the EGR valve.

[0088] The EGR bypass valve 211 is provided with an EGR bypass valve connector 210 for externally connecting to an ECU (Electronic Control Unit), which can realize electronic control, control the bypass opening, and realize controllable temperature after EGR cooling. By adjusting the position of the EGR bypass valve plate 2111 in the EGR bypass valve 211, the exhaust gas channel 13 can be directly connected to the first connecting channel 21, and all the exhaust gas transported by the exhaust gas channel 13 is passed into the first connecting channel 21; it can also be realized that the exhaust gas channel 13 is only connected to the EGR cooler 205, and all the exhaust gas transported by the exhaust gas channel 13 is passed into the EGR cooler 205; it can also be realized that a part of the exhaust gas transported by the exhaust gas channel 13 is passed into the EGR cooler 205, and the other part is directly passed into the first connecting channel 21, and the ratio of the two parts can be adjusted.

[0089] The EGR valve 201 is a lifting valve, and the position of its EGR valve plate 2011 is controlled by the ECU. When the EGR valve stem 2012 drives the EGR valve plate 2011 to move upward and there is a gap with the EGR valve channel 2013, the EGR exhaust gas enters the EGR mixing chamber 3, mixes with the fresh intake air, and then enters the combustion chamber in the engine cylinder through the intake pipe 204 to participate in combustion.

[0090] An embodiment of the present application also provides an engine, including an intake system, and the intake system is the integrated intake system provided in the above embodiment.

[0091] The engine provided by the utility model uses the integrated air intake system provided by the above embodiment to facilitate improving the EGR rate. Of course, the engine provided by this embodiment also has other effects of the integrated air intake system provided by the above embodiment, which will not be repeated here.

[0092] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0093] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated air intake system for an engine, characterized in that: include: An intake pipe, wherein the intake pipe is provided with an air outlet, an air inlet and an exhaust gas channel; an EGR mixing chamber and an intake pressure stabilizing chamber are provided inside the intake pipe; the outlet of the EGR mixing chamber is communicated with the inlet of the intake pressure stabilizing chamber; the air inlet is communicated with the inlet of the EGR mixing chamber; the inlet of the exhaust gas channel is used to receive exhaust gas; the outlet of the intake pressure stabilizing chamber is communicated with the air outlet; An EGR cooler mounting seat, the EGR cooler mounting seat is integrated with the intake pipe, and the EGR cooler mounting seat is provided with an EGR cold front gas outlet and an EGR cold rear gas inlet; the EGR cold front gas outlet is communicated with the outlet of the exhaust gas passage, and the EGR cold rear gas inlet is communicated with the EGR mixing chamber; EGR cooler, the EGR cooler is assembled on the EGR cooler mounting seat through a fixing part, the exhaust gas inlet of the EGR cooler is connected with the EGR front-cooling gas outlet, and the exhaust gas outlet of the EGR cooler is connected with the EGR rear-cooling gas inlet.

2. The integrated air intake system according to claim 1, characterized in that: An EGR valve mounting seat is integrated on the intake pipe and located between the EGR cold post-gas inlet and the EGR mixing chamber; an EGR valve is mounted on the EGR valve mounting seat; The intake pipe has a first connecting passage for connecting the valve core of the EGR valve with the EGR cold gas inlet, and a second connecting passage for connecting the valve core of the EGR valve with the EGR mixing chamber.

3. The integrated air intake system according to claim 2, characterized in that: The EGR mixing chamber is axially connected to the air inlet; The EGR mixing chamber has an exhaust gas inlet in the circumference thereof, and the exhaust gas inlet is communicated with the second connecting passage.

4. The integrated air intake system according to claim 3, characterized in that: A partition plate is provided in the EGR mixing chamber. The partition plate has a notch along the circumferential direction, the notch forms the exhaust gas inlet, and the axial channel surrounded by the partition plate forms the air inlet.

5. The integrated air intake system according to claim 4, characterized in that: The partition plate is connected to a cavity wall of the EGR mixing cavity, and a gas channel is formed between the partition plate and the cavity wall of the EGR mixing cavity, and the exhaust gas inlet and the second connecting channel are communicated through the gas channel.

6. The integrated air intake system according to claim 5, characterized in that: There are multiple second connecting channels, and all of them are connected to the gas channel.

7. The integrated air intake system according to claim 2, characterized in that: The intake pipe is integrated with an EGR bypass valve mounting seat, and the EGR bypass valve is mounted on the EGR bypass valve mounting seat; the intake pipe is provided with a mounting through hole for connecting the EGR bypass valve with the exhaust gas channel; The mounting through hole connects the exhaust gas channel and the first connecting channel; the inlet of the EGR bypass valve connects the exhaust gas channel, one outlet of the EGR bypass valve connects to the EGR cold front gas outlet, and the other outlet of the EGR bypass valve connects to the first connecting channel.

8. The integrated air intake system according to claim 7, characterized in that: The air intake pipe is integrated with a first detection hole connected with the first connecting channel. The first detection hole is installed with a first sensor, and the first sensor is used to detect the gas temperature at the first connecting channel.

9. The integrated air intake system according to any one of claims 1 to 6, characterized in that: The air intake pipe is integrated with a thermostat interface; and / or, The air intake pipe is integrated with a second detection hole connected with the air intake pressure stabilizing chamber, and the second detection hole is installed with a second sensor, and the second sensor is used to detect the temperature and pressure of the gas in the air intake pressure stabilizing chamber.

10. An engine, comprising an air intake system, characterized in that: The air intake system is an integrated air intake system as described in any one of claims 1-9.

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