Low-pressure exhaust gas recirculation system, engine and vehicle

Abstract

The present invention provides a low-pressure exhaust gas recirculation system, an engine and a vehicle. The low-pressure exhaust gas recirculation system includes a cooler, a drainer and a supercharger. The supercharger includes a turbine and a compressor connected to the turbine. The turbine is used to be connected to the exhaust manifold of the engine, and the compressor is used to be connected to the intake manifold of the engine; the cooler is connected to the turbine and the compressor; the drainer is connected to the cooler and the compressor, and the compressor conveys gas to the drainer so that the pressure in the drainer is less than the pressure in the cooler. The low-pressure exhaust gas recirculation system provided by the present invention has relatively high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a low-pressure exhaust gas recirculation system, an engine and a vehicle. Background Art

[0002] In order to further reduce the energy consumption of the engine, an exhaust gas recirculation (EGR) system is used in the engine to re-introduce part of the exhaust gas discharged from the engine into the cylinder, reduce the in-cylinder combustion temperature, increase the compression ratio, and thus reduce the energy consumption. Among them, the EGR system is mainly divided into a high-pressure EGR system and a low-pressure EGR system.

[0003] In the related art, the low-pressure EGR system takes exhaust gas from behind the turbine of the engine supercharger, and the exhaust gas returns to the front of the engine to be mixed with the fresh intake air after passing through components such as an EGR cooler and an EGR valve.

[0004] However, in the above low-pressure EGR system, the condensed water generated by the exhaust gas cooling is likely to enter the compressor of the supercharger, causing damage to the compressor of the supercharger. Summary of the Invention

[0005] The present invention provides a low-pressure exhaust gas recirculation system, an engine and a vehicle to solve the technical problem that the condensed water generated by the exhaust gas cooling is likely to enter the compressor of the supercharger, causing damage to the compressor of the supercharger.

[0006] In a first aspect, the present invention provides a low-pressure exhaust gas recirculation system applied to an engine. The low-pressure exhaust gas recirculation system includes a cooler, a drainer, and a supercharger. The supercharger includes a turbine and a compressor connected to the turbine. The turbine is used to connect to the exhaust manifold of the engine, and the compressor is used to connect to the intake manifold of the engine;

[0007] The cooler is connected to the turbine and the compressor;

[0008] The drainer is connected to the cooler and the compressor, and the compressor delivers gas to the drainer so that the pressure inside the drainer is less than the pressure inside the cooler.

[0009] In a possible implementation manner, for the low-pressure exhaust gas recirculation system provided by the present invention, the drainer includes a drainer body. A first channel and a second channel are provided on the drainer body. One end of the first channel is connected to the cooler, the other end of the first channel communicates with the outside, and the extending direction of the first channel is the same as the extending direction of the drainer body. One end of the second channel is connected to the compressor, and the other end of the second channel communicates with the first channel;

[0010] The cooler has a drain port, and the drain port communicates with the first channel.

[0011] In a possible implementation, the low-pressure exhaust gas recirculation system provided by the present invention, the second channel includes a first connecting section and a second connecting section, one end of the first connecting section is connected to the compressor, the other end of the first connecting section is connected to one end of the second connecting section, and the other end of the second connecting section is in communication with the first channel;

[0012] The extension direction of the second connecting section is consistent with the extension direction of the first channel, and the extension direction of the first connecting section and the extension direction of the second connecting section form an included angle.

[0013] In a possible implementation, in the low-pressure exhaust gas recirculation system provided by the present invention, the inner diameter of the end of the second connecting section away from the first connecting section is smaller than the inner diameter of the end of the second connecting section close to the first connecting section.

[0014] In a possible implementation, the low-pressure exhaust gas recirculation system provided by the present invention, the drainer also includes a heating jacket, the outer wall of the heating jacket is connected to the drainer body, and the heating jacket is used to communicate with the cylinder head of the engine to form a circuit for the circulation of antifreeze.

[0015] In a possible implementation, in the low-pressure exhaust gas recirculation system provided by the present invention, the drainer body has a recessed portion, and at least a portion of the heating sleeve is embedded in the recessed portion.

[0016] In a possible implementation, the low-pressure exhaust gas recirculation system provided by the present invention further includes a catalytic converter and a control valve, wherein the catalytic converter is connected to the turbine;

[0017] The control valve is arranged in the connecting pipeline between the cooler and the compressor.

[0018] In a possible implementation, the low-pressure exhaust gas recirculation system provided by the present invention further includes an intake throttle valve, an air filter and an intake intercooler;

[0019] The air filter is connected to the compressor, and the air intake throttle valve is arranged on the connecting pipeline between the air filter and the compressor;

[0020] The compressor is connected to an intake intercooler, and the intake intercooler is used to be connected to an intake manifold of the engine.

[0021] In a second aspect, the present invention provides an engine, comprising an engine body and the low-pressure exhaust gas recirculation system provided in the first aspect above, connected to the engine body.

[0022] In a third aspect, the present invention provides a vehicle, comprising a vehicle body and the engine provided in the second aspect above connected to the vehicle body.

[0023] The low-pressure exhaust gas recirculation system, engine and vehicle provided by the present invention. The low-pressure exhaust gas recirculation system is provided with a cooler, a drainer and a supercharger. The supercharger includes a turbine and a compressor connected to the turbine. The turbine is connected to the exhaust manifold of the engine, and the compressor is connected to the intake manifold of the engine. The cooler is connected to the turbine and the compressor, and the drainer is connected to the cooler and the compressor. The compressor is used to transport the gas compressed by the compressor into the drainer, so that the pressure in the drainer is less than the pressure in the cooler. In this way, the condensed water is easily sucked into the drainer, effectively avoiding the condensed water from entering the compressor of the supercharger and causing damage to the compressor of the supercharger. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 Structural schematic diagram of the low-pressure exhaust gas recirculation system provided by the embodiment of the present invention;

[0026] Figure 2 Structural schematic diagram of the drainer in the low-pressure exhaust gas recirculation system provided by the embodiment of the present invention;

[0027] Figure 3 Left view of the drainer in the low-pressure exhaust gas recirculation system provided by the embodiment of the present invention;

[0028] Figure 4 Top view of the drainer in the low-pressure exhaust gas recirculation system provided by the embodiment of the present invention;

[0029] Figure 5 Structural schematic diagram of the engine provided by the embodiment of the present invention;

[0030] Figure 6 Structural schematic diagram of the vehicle provided by the embodiment of the present invention.

[0031] Description of the reference numerals:

[0032] 100 - cooler;

[0033] 200 - drainer;

[0034] 210 - drainer body;

[0035] 211 - first channel;

[0036] 212 - second channel;

[0037] 2121 - First connection segment;

[0038] 2122 - Second connection segment;

[0039] 213 - Concave part;

[0040] 220 - Heating sleeve;

[0041] 300 - Supercharger;

[0042] 310 - Turbine;

[0043] 320 - Compressor;

[0044] 400 - Engine;

[0045] 410 - Exhaust manifold;

[0046] 420 - Intake manifold;

[0047] 430 - Cylinder head;

[0048] 440 - Engine body;

[0049] 500 - Catalytic converter;

[0050] 600 - Control valve;

[0051] 700 - Intake throttle valve;

[0052] 800 - Air filter;

[0053] 900 - Intercooler;

[0054] 1000 - Low - pressure exhaust gas recirculation system;

[0055] 1100 - Vehicle;

[0056] 1110 - Vehicle body. Detailed implementation manners

[0057] In the description of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected to" shall be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] In the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0059] In the specification and claims of the present invention and the above-mentioned drawings, the terms "first", "second", "third" (if any) are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein, for example.

[0060] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or maintenance tool that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or maintenance tools.

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0062] In the related art, the EGR system is mainly divided into a high-pressure EGR system and a low-pressure EGR system. The high-pressure EGR system extracts exhaust gas from the front of the turbine of the supercharger. The exhaust gas passes through components such as an EGR cooler and an EGR valve and returns to the engine intake pipe to be mixed with fresh intake air. The driving force of the exhaust gas is the relatively high exhaust pressure. The low-pressure EGR system extracts exhaust gas from the rear of the turbine of the supercharger, generally from the rear of the aftertreatment (catalytic converter). The exhaust gas passes through components such as an EGR cooler and an EGR valve and returns to the front of the engine compressor to be mixed with fresh intake air. The driving force of the exhaust gas is the suction of the compressor of the supercharger with a relatively low pressure.

[0063] In a low-pressure EGR system, when the high-temperature exhaust gas flows through the EGR cooler, a large amount of condensed water is generated because the gas temperature drops below the dew point of water. At this time, since the pressure inside the EGR cooler is lower than the external atmospheric pressure, it is difficult for the condensed water to be discharged to the atmosphere by gravity, and the condensed water is easily carried into the compressor by the gas, causing damage to the impeller. If it enters the cylinder, it will have a negative impact on the combustion of the engine.

[0064] To solve the above technical problems, the low-pressure exhaust gas recirculation system provided by the present invention is provided with a drainer. The drainer is connected to the cooler and the compressor. The compressor is used to transport the gas compressed by the compressor into the drainer, so as to form a low-pressure area in the drainer. That is to say, the pressure in the low-pressure area in the drainer is less than the pressure in the cooler. The condensed water can be discharged to the atmosphere through the drainer under the action of the pressure difference, thus effectively avoiding being carried into the compressor by the gas and causing damage to the impeller, and improving the reliability of the engine.

[0065] Figure 1 It is a schematic structural diagram of the low-pressure exhaust gas recirculation system provided by an embodiment of the present invention.

[0066] See Figure 1 As shown, the low-pressure exhaust gas recirculation system 1000 provided by the present invention is applied to an engine 400. The low-pressure exhaust gas recirculation system 1000 includes a cooler 100, a drainer 200, and a supercharger 300. The supercharger 300 includes a turbine 310 and a compressor 320 connected to the turbine 310. The turbine 310 is used to be connected to the exhaust manifold 410 of the engine 400, and the compressor 320 is used to be connected to the intake manifold 420 of the engine 400.

[0067] The cooler 100 is connected to the turbine 310 and the cooler 100 is connected to the compressor 320.

[0068] The drainer 200 is connected to the cooler 100 and the drainer 200 is connected to the compressor 320. The compressor 320 transports gas to the drainer 200 so that the pressure in the drainer 200 is less than the pressure in the cooler 100.

[0069] During use, a part of the exhaust gas discharged from the exhaust manifold 410 enters the cooler 100, the condensed water generated by the exhaust gas enters the drainer 200, and a part of the gas enters the intake manifold 420 of the engine 400 through the compressor 320.

[0070] Specifically, the bottom of the cooler 100 has a drain port. In order to prevent gas from overflowing from the drain port, the size of the drain port is small, and the pressure inside the cooler 100 is lower than the external atmospheric pressure. The condensed water is easily accumulated near the drain port, and it is difficult to discharge the condensed water.

[0071] Therefore, by setting up the drainer 200, which is connected to the drain outlet of the condenser, and using the compressor 320 to deliver the gas compressed by the compressor into the drainer 200, the pressure inside the drainer 200 is made less than the pressure inside the cooler 100. As a result, the condensed water is easily sucked into the drainer 200 and then discharged into the atmosphere through the drainer 200.

[0072] It can be understood that using the compressor 320 to deliver the gas compressed by the compressor 320 into the drainer 200, making the pressure inside the drainer 200 less than the pressure inside the cooler 100, is of low implementation difficulty, has a simple structure, occupies little space, and is beneficial to the layout and setting of the low-pressure exhaust gas recirculation system 1000.

[0073] The low-pressure exhaust gas recirculation system 1000 provided in this embodiment includes a cooler 100, a drainer 200, and a supercharger 300. The supercharger 300 includes a turbine 310 and a compressor 320 connected to the turbine 310. The turbine 310 is connected to the exhaust manifold 410 of the engine 400, and the compressor 320 is connected to the intake manifold 420 of the engine 400. The cooler 100 is connected to the turbine 310 and also connected to the compressor 320. The drainer 200 is connected to the cooler 100 and also connected to the compressor 320. By using the compressor 320 to deliver the gas compressed by the compressor 320 into the drainer 200, the pressure inside the drainer 200 is made less than the pressure inside the cooler 100. In this way, the condensed water is easily sucked into the drainer 200, effectively preventing the condensed water from entering the compressor 320 of the supercharger 300 and causing damage to the compressor 320 of the supercharger 300.

[0074] Figure 2 It is a schematic structural view of the drainer in the low-pressure exhaust gas recirculation system provided by an embodiment of the present invention. Figure 3 It is a left view of the drainer in the low-pressure exhaust gas recirculation system provided by an embodiment of the present invention. Figure 4 It is a top view of the drainer in the low-pressure exhaust gas recirculation system provided by an embodiment of the present invention.

[0075] See Figures 2 to 4 As shown, the drainer 200 includes a drainer body 210. A first channel 211 and a second channel 212 are provided on the drainer body 210. One end of the first channel 211 is connected to the cooler 100, and the other end of the first channel 211 is in communication with the outside. The extending direction of the first channel 211 is the same as the extending direction of the drainer body 210. In this way, the overall volume of the drainer 200 is small, it occupies little space, and it has a simple structure, which is convenient for processing.

[0076] One end of the second channel 212 is connected to the compressor 320, and the other end of the second channel 212 is located within the first channel 211. That is to say, the other end of the second channel 212 communicates with the first channel 211.

[0077] Among them, the first channel 211 is a condensate drainage channel, and the second channel 212 is a gas channel.

[0078] Specifically, in order to save space, one end of the drainer body 210 abuts against the bottom of the cooler 100, so that the first channel 211 communicates with the drain port of the cooler 100.

[0079] During use, the compressor 320 is used to transport the gas compressed by the compressor 320 into the second channel 212, so that the pressure in the first channel 211 is less than the pressure in the cooler 100, and the condensate is easily sucked into the first channel 211 and then discharged into the atmosphere through the first channel 211.

[0080] In a possible implementation manner, the second channel 212 includes a first connection section 2121 and a second connection section 2122. One end of the first connection section 2121 is connected to the compressor 320, the other end of the first connection section 2121 is connected to one end of the second connection section 2122, and the other end of the second connection section 2122 communicates with the first channel 211.

[0081] Among them, the extending direction of the second connection section 2122 is the same as the extending direction of the first channel 211, and the extending direction of the first connection section 2121 has an included angle with the extending direction of the second connection section 2122.

[0082] It can be understood that the extending direction of the first connection section 2121 has an included angle with the extending direction of the second connection section 2122. In this way, the connection position between the drainer 200 and the compressor 320 can be set on the side wall of the drainer 200, which is convenient for the layout of the first channel 211 and the second channel 212, so that the overall structure of the drainer 200 is compact.

[0083] Specifically, the extending direction of the first connection section 2121 and the extending direction of the second connection section 2122 may be perpendicular to each other.

[0084] It should be noted that in order to reduce the pressure loss of the gas compressed by the compressor 320 and transported into the second channel 212 by the compressor 320, one end of the first connection section 2121 and one end of the second connection section 2122 are smoothly connected.

[0085] In another possible implementation manner, the extending direction of the second channel 212 is the same as the extending direction of the first channel 211.

[0086] In order to increase the flow rate of the gas delivered by the compressor 320 into the second channel 212, the inner diameter of the end of the second connection section 2122 that is away from the first connection section 2121 is smaller than the inner diameter of the end of the second connection section 2122 that is close to the first connection section 2121. In this way, the amount of gas delivered by the compressor 320 into the second channel 212 can be reduced, thereby reducing energy consumption.

[0087] Specifically, as shown in Figure 2 the inner diameter of the end of the second connection section 2122 that is away from the first connection section 2121 gradually decreases.

[0088] It should be noted that in order to reduce the size of the drainer 200 and the occupied space, the inner diameter of the end of the first channel 211 that is away from the cooler 100 is smaller than the inner diameter of the part of the first channel 211 that houses the second channel 212.

[0089] In some embodiments, the drainer 200 further includes a heating jacket 220. The outer wall of the heating jacket 220 is connected to the drainer body 210. The heating jacket 220 is used to communicate with the cylinder head 430 of the engine 400 to form a loop for the antifreeze to flow through.

[0090] It should be noted that the inner cavity of the heating jacket 220 is isolated from both the first channel 211 and the second channel 212.

[0091] It can be understood that in a cold environment, the condensed water is likely to freeze and block the drain port of the cooler 100, resulting in a failure where the condensed water cannot be discharged. Therefore, by providing the heating jacket 220, the heating jacket 220 and the cylinder head 430 of the engine 400 form a heating water circuit, and the antifreeze in the cylinder head 430 is circulated and delivered into the heating jacket 220, so that the heat of the antifreeze is transferred to the first channel 211 through the heating jacket 220 and the drainer body 210.

[0092] Moreover, the heat of the gas in the second channel 212 is transferred to the first channel 211, which can also achieve a heating effect.

[0093] In order to improve the heating effect, the drainer body 210 has a recessed portion 213, and at least part of the heating jacket 220 is embedded in the recessed portion 213. In this way, the distance from the heating jacket 220 to the first channel 211 can be reduced, thereby improving the efficiency of heat transfer of the antifreeze and also improving the utilization rate of the heat of the antifreeze.

[0094] Among them, in order to facilitate the connection between the heating jacket 220 and the cylinder head 430 of the engine 400, the extending direction of the heating jacket 220 and the extending direction of the first channel 211 form an angle.

[0095] Exemplarily, the extending direction of the heating jacket 220 and the extending direction of the first channel 211 can be perpendicular to each other.

[0096] In a possible implementation, the low-pressure exhaust gas recirculation system 1000 further includes a catalytic converter 500 and a control valve 600. The catalytic converter 500 is connected to the turbine 310, and the cooler 100 is connected to the catalytic converter 500.

[0097] The control valve 600 is disposed on the connecting pipeline between the cooler 100 and the compressor 320.

[0098] Wherein, the catalytic converter 500 is used to convert CO, HC, and NO in the exhaust gas x into gases harmless to the human body.

[0099] Wherein, the control valve 600 is used to control the amount of exhaust gas entering the compressor 320.

[0100] In some embodiments, the low-pressure exhaust gas recirculation system 1000 further includes an intake throttle valve 700, an air filter 800, and an intake air intercooler 900.

[0101] The air filter 800 is connected to the compressor 320, and the intake throttle valve 700 is disposed on the connecting pipeline between the air filter 800 and the compressor 320.

[0102] The compressor 320 is connected to the intake air intercooler 900, and the intake air intercooler 900 is used to be connected to the intake manifold 420 of the engine 400.

[0103] Wherein, the intake throttle valve 700 is used to control the amount of fresh air entering the compressor 320.

[0104] Wherein, the air filter 800 is used to remove impurities in the fresh air.

[0105] Wherein, the intake air intercooler 900 is used to cool the gas entering the engine 400.

[0106] Figure 5 It is a schematic structural diagram of the engine provided by the embodiment of the present invention.

[0107] See Figure 5 As shown, the engine 400 provided by the present invention includes an engine body 440 and the low-pressure exhaust gas recirculation system 1000 provided by the above embodiment, which is connected to the engine body 440.

[0108] Wherein, the structure and principle of the low-pressure exhaust gas recirculation system 1000 have been described in detail in the above embodiment, and will not be elaborated herein one by one.

[0109] The engine 400 provided in this embodiment can reduce the failures of the engine 400 and improve the reliability of the engine 400 by providing an engine body 440 and a low-pressure exhaust gas recirculation system 1000 connected to the engine body 440.

[0110] Figure 6 It is a schematic structural diagram of a vehicle provided in an embodiment of the present invention.

[0111] See Figure 6 As shown, the vehicle 1100 provided by the present invention includes a vehicle body 1110 and the engine 400 provided in the above embodiment connected to the vehicle body 1110.

[0112] Among them, the structure and principle of the engine 400 have been described in detail in the above embodiment, and will not be repeated one by one in this embodiment.

[0113] The vehicle provided in this embodiment can improve the overall reliability of the vehicle 1100 and enhance the user experience by providing a vehicle body 1110 and an engine 400 connected to the vehicle body 1110, and the reliability of the engine 400 is relatively high.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-pressure exhaust gas recirculation system, characterized in that, Applied to an engine, the low-pressure exhaust gas recirculation system includes a cooler, a drainer, and a supercharger. The supercharger includes a turbine and a compressor connected to the turbine. The turbine is used to connect to the exhaust manifold of the engine, and the compressor is used to connect to the intake manifold of the engine; The cooler is connected to the turbine and the compressor; The drainer is connected to the cooler and the compressor. The compressor delivers gas to the drainer so that the pressure inside the drainer is less than the pressure inside the cooler; The drainer includes a drainer body. A first channel and a second channel are provided on the drainer body. One end of the first channel is connected to the cooler, and the other end of the first channel communicates with the outside. The extending direction of the first channel is the same as the extending direction of the drainer body; One end of the second channel is connected to the compressor, and the other end of the second channel communicates with the first channel; The cooler has a drain port, and the drain port communicates with the first channel; The drainer further includes a heating jacket. The outer wall of the heating jacket is connected to the drainer body. The heating jacket is used to communicate with the cylinder head of the engine to form a circuit for the antifreeze to flow through; the inner cavity of the heating jacket is isolated from both the first channel and the second channel; The drainer body has a recessed portion, and at least part of the heating jacket is partially embedded in the recessed portion.

2. The low-pressure exhaust gas recirculation system according to claim 1, characterized in that, The second channel includes a first connection section and a second connection section. One end of the first connection section is connected to the compressor, the other end of the first connection section is connected to one end of the second connection section, and the other end of the second connection section communicates with the first channel; The extending direction of the second connection section is the same as the extending direction of the first channel, and the extending direction of the first connection section has an included angle with the extending direction of the second connection section.

3. The low-pressure exhaust gas recirculation system according to claim 2, wherein The inner diameter of the end of the second connection section away from the first connection section is smaller than the inner diameter of the end of the second connection section close to the first connection section.

4. The low-pressure exhaust gas recirculation system according to any one of claims 1 to 3, characterized in that, It further includes a catalytic converter and a control valve. The catalytic converter is connected to the turbine, and the cooler is connected to the catalytic converter; The control valve is provided in the connecting pipeline between the cooler and the compressor.

5. The low-pressure exhaust gas recirculation system according to any one of claims 1 to 3, characterized in that, It further includes an intake throttle valve, an air filter, and an intake air intercooler; The air filter is connected to the compressor, and the intake throttle valve is provided in the connecting pipeline between the air filter and the compressor; The compressor is connected to the intake air intercooler, and the intake air intercooler is used to connect to the intake manifold of the engine.

6. An engine, characterized in that, It includes an engine body and the low-pressure exhaust gas recirculation system according to any one of claims 1 to 5 connected to the engine body.

7. A vehicle, characterized in that, It includes a vehicle body and the engine according to claim 6 connected to the vehicle body.

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