An engine EGR system and method

Abstract

The application discloses an engine EGR system and method, wherein the system comprises an air intake assembly, an exhaust assembly, a combustion chamber and an EGR assembly, one end of the air intake assembly is provided with an air inlet, one end of the exhaust assembly is provided with an exhaust outlet, the air inlet end and the exhaust end of the combustion chamber are connected to the other end of the air intake assembly and the exhaust assembly respectively, the EGR assembly is used for transporting part of the exhaust from the exhaust assembly to the air intake assembly, wherein the air intake assembly is provided with a humidity sensor, an intercooler and a heating device, the humidity sensor is used for detecting the air humidity in the air intake assembly, the intercooler is used for reducing the temperature of the mixed gas of the air and the exhaust, and the heating device is used for heating the intercooler to a preset temperature corresponding to the air humidity when the air humidity is higher than a first preset humidity. The application prevents the engine misfire caused by the excessively high air humidity by means of the heating device cooperating with the humidity sensor in a heating mode, and reduces the condensate water without causing the reduction of the recirculated exhaust.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine, in particular to an engine EGR system and method. BACKGROUND

[0002] In the prior art, turbocharged engines are increasingly common, in order to further improve the economy of the engine, usually on the basis of turbocharged engine plus EGR (exhaust gas recirculation) device, that is, through the EGR valve control part of the exhaust gas backflow to the intake pipe, mixed with fresh air, after cooling through the intercooler into the engine combustion chamber, re-burning, and then improve the engine economy.

[0003] However, when the humidity of fresh air is too high, containing a large amount of water, when mixed with high-temperature exhaust gas through the intercooler, a large amount of condensate water will appear, too much condensate water into the combustion chamber will cause the engine misfire, which is extremely detrimental to the driving safety.

[0004] At present, in order to solve the problem that the engine misfire will occur when the humidity of fresh air is too high and mixed with high-temperature exhaust gas, the usual way is to add a humidity sensor in the intake pipe, when the humidity sensor detects that the humidity of fresh air is too high, the opening of the EGR valve will be controlled according to the measured value of the humidity sensor, that is, the higher the humidity, the less the recirculated exhaust gas, although it can solve the problem of engine misfire, but reduces the recirculated exhaust gas, which deteriorates the economy of the engine. SUMMARY

[0005] The present application aims to provide an engine EGR system and method, which aims to solve the problem that the air humidity is too high in the prior art, which will cause the engine misfire, and the use of humidity sensor to control the opening of the EGR valve reduces the recirculated exhaust gas.

[0006] To solve the above technical problems, the present application is realized by the following technical solutions: provide a kind of engine EGR system, comprising: air intake component, exhaust component, combustion chamber and EGR component, the air intake component one end is provided with air intake port;The exhaust component one end is provided with exhaust port;The air intake end and exhaust end of the combustion chamber are connected the other end of the air intake component and the exhaust component respectively;The EGR component is used to transport part of exhaust gas generated by the combustion chamber from the exhaust component to the air intake component;Wherein, the air intake component is provided with humidity sensor, intercooler and heating device, the humidity sensor is used to detect the air humidity in the air intake component, the intercooler is used to reduce the temperature of air and exhaust gas mixed gas, the heating device is used to when the air humidity is higher than the first preset humidity, the current air humidity in the air intake component is inquired from the preset air humidity in the air intake component and the intercooler heating temperature relationship table to determine the heating temperature of the intercooler, and the intercooler is heated according to the heating temperature of the intercooler;The air intake component includes: air intake pipe, mixed intake pipe and exhaust gas intake port, one end of the air intake pipe is connected with the air intake port, and the humidity sensor is arranged in the air intake pipe.

[0007] Further, the mixed intake pipe is connected to the other end of the air intake pipe, and the intercooler and the heating device are arranged in the mixed intake pipe;The exhaust gas intake port is arranged at the connection between the air intake pipe and the mixed intake pipe, and the exhaust gas intake port is connected with the EGR component for inputting exhaust gas into the mixed intake pipe.

[0008] Further, the EGR component includes: exhaust gas intake pipe and EGR valve, one end of the exhaust gas intake pipe is connected with the exhaust component, and the other end is connected with the exhaust gas intake port;The EGR valve is connected in the exhaust gas intake pipe, for adjusting the opening degree of the EGR valve corresponding to the air humidity when the air humidity is higher than the second preset humidity;Wherein, the second preset humidity is greater than the first preset humidity.

[0009] Further, the heating device is arranged in the intercooler.

[0010] Further, the heating device is arranged outside the intercooler.

[0011] Further, the heating device comprises a heating component, a temperature controller, a control wire harness and a temperature sensor, the heating component is used for heating the intercooler; the temperature controller is used for controlling the heating component to heat the intercooler to a preset temperature; the control wire harness is used for connecting the heating component and the temperature controller; and the temperature sensor is used for detecting the temperature of the intercooler; wherein the preset temperature is determined according to a preset air humidity in the air intake assembly and the intercooler heating temperature relationship table.

[0012] Further, the exhaust assembly comprises an exhaust pipe, one end of the exhaust pipe is connected with the exhaust outlet, and the other end of the exhaust pipe is connected with one end of the exhaust inlet pipe.

[0013] Further, the engine EGR system further comprises an exhaust turbocharger, the exhaust turbocharger comprises a turbine part, a connecting shaft and a supercharging part, two ends of the connecting shaft are connected with the turbine part and the supercharging part respectively, the turbine part is arranged in the exhaust pipe and used for driving the connecting shaft to rotate, and the supercharging part is arranged in the air inlet pipe and used for compressing the air in the air inlet pipe.

[0014] Further, the engine EGR system further comprises an air filter, the air filter is arranged at one end of the air inlet pipe close to the air inlet port and used for filtering the air entering the air inlet pipe through the air inlet port.

[0015] The application further provides an engine EGR method of the engine EGR system as described above, comprising:

[0016] detecting the air humidity in the air intake assembly through a humidity sensor;

[0017] if the air humidity is higher than a first preset humidity, heating the intercooler to a preset temperature through a heating device;

[0018] intaking air into the combustion chamber through the air intake assembly;

[0019] discharging the exhaust gas of the combustion chamber through the exhaust assembly;

[0020] transporting part of the exhaust gas from the exhaust assembly into the air intake assembly through the EGR assembly.

[0021] The embodiment of the present application provides an engine EGR system and method, wherein the system comprises: an air intake assembly, an exhaust assembly, a combustion chamber and an EGR assembly, one end of the air intake assembly is provided with an air inlet; one end of the exhaust assembly is provided with an exhaust outlet; the air inlet end and the exhaust end of the combustion chamber are connected to the other end of the air intake assembly and the exhaust assembly respectively; the EGR assembly is used for transporting part of the exhaust gas generated by the combustion chamber from the exhaust assembly to the air intake assembly; wherein the air intake assembly is provided with a humidity sensor, a intercooler and a heating device, the humidity sensor is used for detecting the air humidity in the air intake assembly, the intercooler is used for reducing the temperature of the gas mixed by the air and the exhaust gas, and the heating device is used for heating the intercooler to a preset temperature corresponding to the air humidity when the air humidity is higher than a first preset humidity. The heating device cooperates with the humidity sensor to prevent the engine misfire caused by the too high air humidity in a heating mode, and does not cause the reduction of the recirculated exhaust gas under the premise of reducing the condensed water. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 A structural schematic diagram of an engine EGR system provided by the embodiment of the present application is provided.

[0024] Figure 2 A structural schematic diagram of a heating device provided by the embodiment of the present application is provided.

[0025] Figure 3 A flowchart of an engine EGR method provided by the embodiment of the present application is provided.

[0026] Figure 4 A table of the relationship between the air humidity in the air intake assembly and the heating temperature of the intercooler provided by the embodiment of the present application is provided.

[0027] Figure 5 A table of the relationship between the air humidity in the air intake assembly and the opening degree of the EGR valve provided by the embodiment of the present application is provided.

[0028] Explanation of the identification in the figure:

[0029] 1, air intake assembly; 11, air inlet; 12, air inlet pipe; 13, mixed air inlet pipe; 14, exhaust gas inlet;

[0030] 2, exhaust assembly; 21, exhaust outlet; 22, exhaust pipe;

[0031] 3, combustion chamber; 31, air inlet end; 32, exhaust end;

[0032] 4. EGR assembly; 41, exhaust gas intake pipe; 42, EGR valve;

[0033] 5. Humidity sensor;

[0034] 6. Intercooler;

[0035] 7. Heating device; 71, heating component; 72, temperature controller; 73, control harness; 74, temperature sensor;

[0036] 8. Exhaust turbocharger; 81, turbine portion; 82, connecting shaft; 83, supercharging portion;

[0037] 9. Air cleaner. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0039] It should be understood that the terms “comprise” and “include” as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0040] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0041] It should be further understood that the term “and / or” as used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0042] Combination Figures 1-5As shown in the figure, the present application provides an engine EGR system, comprising: an air intake assembly 1, an exhaust assembly 2, a combustion chamber 3 and an EGR assembly 4, one end of the air intake assembly 1 is provided with an air inlet 11; one end of the exhaust assembly 2 is provided with an exhaust outlet 21; the air inlet end 31 and the exhaust end 32 of the combustion chamber 3 are respectively connected to the other end of the air intake assembly 1 and the exhaust assembly 2; the EGR assembly 4 is used to transport part of the exhaust gas generated by the combustion chamber 3 from the exhaust assembly 2 to the air intake assembly 1; wherein, the air intake assembly 1 is provided with a humidity sensor 5, a intercooler 6 and a heating device 7, the humidity sensor 5 is used to detect the humidity of the air in the air intake assembly 1, the intercooler 6 is used to reduce the temperature of the mixed gas of air and exhaust gas, and the heating device 7 is used to determine the heating temperature of the intercooler 6 by querying the preset air humidity in the air intake assembly 1 and the intercooler 6 heating temperature relationship table according to the current air humidity in the air intake assembly when the air humidity is higher than the first preset humidity, and heating the intercooler 6 according to the heating temperature of the intercooler 6; the air intake assembly 1 comprises: an air inlet pipe 12, a mixed air inlet pipe 13 and an exhaust gas inlet 14, one end of the air inlet pipe 12 is connected to the air inlet 11, and the humidity sensor 5 is arranged in the air inlet pipe 12.

[0043] In the embodiment of the present application, when the engine is working normally, air enters the air intake assembly 1 from the air inlet 11, and enters the combustion chamber 3 through the air inlet end 31, the exhaust gas generated after the air burns in the combustion chamber 3 enters the exhaust assembly 2 through the exhaust end 32, and is discharged from the engine through the exhaust outlet 21, and part of the exhaust gas is transported from the exhaust assembly 2 to the air intake assembly 1 by the EGR assembly 4, which is controlled by the EGR assembly 4 to flow back to the air intake assembly 1, mixed with fresh air, cooled by the intercooler 6 and then enters the engine combustion chamber 3 for re-combustion, thereby improving the economy of the engine, and the heating device 7 cooperates with the humidity sensor 5 to prevent the engine from misfiring due to excessive air humidity, and reduces the condensate water without reducing the recirculated exhaust gas.

[0044] The first preset humidity is set according to the actual situation of the combustion chamber 3 of the engine, and the preset air humidity in the air intake assembly 1 and the intercooler 6 heating temperature relationship table is as follows Figure 4 As shown in the figure, the first column of data is the air humidity in the air intake assembly 1, the first row of data is the initial temperature of the intercooler 6, which is in Celsius, the initial temperature of the intercooler 6 is taken as the abscissa, the air humidity in the air intake assembly 1 is taken as the ordinate, and the output is the target temperature of the intercooler 6 heated by the heating device 7, for example, when the initial temperature of the intercooler 6 is 20 degrees Celsius, the air humidity in the air intake assembly 1 is 20%, the heating device 7 is in the off state, that is, off state, at this time, the first preset humidity is 50%, when the air humidity in the air intake assembly 1 is 50%, the heating device 7 is turned on and the temperature in the intercooler 6 is heated to 25 degrees Celsius.

[0045] In some embodiments, the mixed intake pipe 13 is connected to the other end of the air intake pipe 12, the intercooler 6 and the heating device 7 are arranged in the mixed intake pipe 13; the exhaust gas intake port 14 is arranged at the connection between the air intake pipe 12 and the mixed intake pipe 13, and the exhaust gas intake port 14 is connected to the EGR assembly 4 for inputting exhaust gas into the mixed intake pipe 13.

[0046] In this embodiment, air enters the air intake pipe 12 from the air intake port 11, part of the exhaust gas generated by the combustion chamber 3 enters the connection between the air intake pipe 12 and the mixed intake pipe 13 from the exhaust gas intake port 14, and the air and the exhaust gas enter the intercooler 6 after being mixed in the mixed intake pipe 13. By arranging the humidity sensor 5 in the air intake pipe 12 to detect the humidity of the air, arranging the intercooler 6 and the heating device 7 in the mixed intake pipe 13, it is convenient to heat the mixed gas in the intercooler 6 when the humidity of the air detected by the humidity sensor 5 is higher than the first preset humidity, to reduce the existence of condensed water and prevent too much condensed water from entering the combustion chamber 3 to cause engine misfire.

[0047] In some embodiments, the EGR assembly 4 includes: an exhaust gas intake pipe 41 and an EGR valve 42, one end of the exhaust gas intake pipe 41 is connected to the exhaust assembly 2, and the other end is connected to the exhaust gas intake port 14; the EGR valve 42 is connected in the exhaust gas intake pipe 41, for adjusting the opening of the EGR valve 42 to the humidity of the air when the humidity of the air is higher than the second preset humidity; wherein the second preset humidity is greater than the first preset humidity.

[0048] In this embodiment, part of the exhaust gas generated by the combustion chamber 3 enters the exhaust gas intake pipe 41 from the exhaust assembly 2, passes through the exhaust gas intake pipe 41 to enter the exhaust gas intake port 14, and the opening of the EGR valve 42 controls the amount of exhaust gas entering the combustion chamber 3. Reducing the amount of exhaust gas entering the combustion chamber 3 can protect the combustion chamber 3. The second preset humidity is set according to the actual situation of the combustion of the combustion chamber 3 of the engine. When the humidity of the air is higher than the second preset humidity, the existence of condensed water cannot be reduced only by the heating device 7. By reducing the opening of the EGR valve 42, that is, reducing the degree of combustion in the combustion chamber 3, engine misfire can be prevented.

[0049] The second preset humidity is set according to the actual situation of the combustion of the combustion chamber 3 of the engine, and the relationship table of the humidity of the air in the intake assembly 1 and the opening of the EGR valve 42 is as follows: Figure 5As shown, the first column of data is the air humidity in the air intake assembly 1, the first row of data is the temperature of the intercooler 6 in Celsius, the temperature of the intercooler 6 is taken as the horizontal coordinate, the air humidity in the air intake assembly 1 is taken as the vertical coordinate, and the output is the opening of the EGR valve 42. For example, when the temperature of the intercooler 6 is 20 degrees Celsius, the air humidity in the air intake assembly 1 is 20%, and the opening of the EGR valve 42 is 0.08, i.e., 8% open, when the air humidity in the air intake assembly 1 is 50%, the opening of the EGR valve 42 is 0.05, i.e., 5% open.

[0050] In some embodiments, the heating device 7 is arranged in the intercooler 6.

[0051] In this embodiment, the heating device 7 is arranged in the intercooler 6, which facilitates the detection of the temperature in the intercooler 6, so as to determine whether the intercooler 6 needs to be continuously heated or stopped.

[0052] In some embodiments, the heating device 7 is arranged outside the intercooler 6.

[0053] In this embodiment, the heating device 7 is arranged outside the intercooler 6, which facilitates the rapid heating of the intercooler 6 and can rapidly reduce the presence of condensed water.

[0054] In some embodiments, the heating device 7 comprises a heating component 71, a temperature controller 72, a control wire harness 73, and a temperature sensor 74. The heating component 71 is used to heat the intercooler 6. The temperature controller 72 is used to control the heating component 71 to heat the intercooler 6 to a preset temperature. The control wire harness 73 is used to connect the heating component 71 and the temperature controller 72. The temperature sensor 74 is used to detect the temperature of the intercooler 6. The preset temperature is determined according to a preset air humidity in the air intake assembly 1 and intercooler 6 heating temperature relationship table.

[0055] In this embodiment, the heating component 71 is controlled by the temperature controller 72 to heat the intercooler 6 to a preset temperature, and the temperature of the intercooler 6 is detected by the temperature sensor 74. Under the premise of reducing the presence of condensed water, the temperature of the mixed gas is prevented from being too high to cause damage to the engine.

[0056] In some embodiments, the exhaust assembly 2 comprises an exhaust gas exhaust pipe 22. One end of the exhaust gas exhaust pipe 22 is connected to the exhaust gas exhaust port 21, and the other end is connected to one end of the exhaust gas intake pipe 41.

[0057] In this embodiment, part of the exhaust gas generated by the combustion chamber 3 enters the exhaust gas intake pipe 41, and the other part is discharged from the exhaust gas exhaust pipe 22. The exhaust gas entering the exhaust gas intake pipe 41 is controlled according to the opening of the EGR valve 42.

[0058] In some embodiments, the engine EGR system further comprises: an exhaust turbocharger 8, the exhaust turbocharger 8 comprising a turbine part 81, a connecting shaft 82 and a supercharging part 83, the connecting shaft 82 being connected to the turbine part 81 and the supercharging part 83 respectively, the turbine part 81 being arranged in the exhaust pipe 22 for driving the connecting shaft 82 to rotate, the supercharging part 83 being arranged in the air intake pipe 12 for compressing air in the air intake pipe 12.

[0059] In the embodiment, the exhaust turbocharger 8 introduces the exhaust gas discharged by the engine into the turbine part 81, and drives the turbine part 81 to rotate by using the energy of the exhaust gas, thereby driving the supercharging part 83 coaxial with the turbine part 81 to realize supercharging of air in the air intake pipe 12, increasing the efficiency of air entering the air intake pipe 12, and accelerating the combustion in the combustion chamber 3, further accelerating the output power of the engine.

[0060] In some embodiments, the engine EGR system further comprises: an air filter 9, the air filter 9 being arranged at one end of the air intake pipe 12 close to the air inlet 11, for filtering air entering the air intake pipe 12 through the air inlet 11.

[0061] In the embodiment, filtering air entering the air intake pipe 12 through the air inlet 11 by the air filter 9 can reduce impurities in the air, and to some extent reduce the moisture in the air, thereby reducing the amount of condensed water.

[0062] The application also provides an engine EGR method of the engine EGR system as described above, comprising steps S10-S50:

[0063] S10, detecting the air humidity in the air intake assembly 1 by the humidity sensor 5;

[0064] S20, if the air humidity is higher than the first preset humidity, heating the intercooler 6 to a preset temperature by the heating device 7;

[0065] S30, air intake to the combustion chamber 3 by the air intake assembly 1;

[0066] S40, exhaust gas discharged from the combustion chamber 3 by the exhaust assembly 2;

[0067] S50, transporting part of the exhaust gas from the exhaust assembly 2 to the air intake assembly 1 by the EGR assembly 4.

[0068] In the embodiment of the present application, air enters the combustion chamber 3 from the air intake assembly 1, and exhaust gas is generated after the air burns in the combustion chamber 3, and the exhaust gas is discharged from the engine through the exhaust assembly 2, and part of the exhaust gas is transported from the exhaust assembly 2 to the air intake assembly 1 by the EGR assembly 4, and the part of the exhaust gas is controlled to flow back to the air intake assembly 1 by the EGR assembly 4, mixed with fresh air, cooled by the intercooler 6, and then enters the engine combustion chamber 3 to burn again, thereby improving the economy of the engine, and the heating device 7 cooperates with the humidity sensor 5 to prevent the engine from misfiring due to excessive air humidity in a heated manner, and to prevent the reduction of recirculated exhaust gas under the premise of reducing condensate water

[0069] Among them, steps S10-S50 are only used for marking for easy understanding, and do not represent the order of steps. In actual application scenarios, steps S10-S50 are generally performed synchronously.

[0070] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An engine EGR system characterized by, The application relates to an air intake assembly, an exhaust assembly, a combustion chamber, an EGR assembly and an exhaust turbocharger. The air intake assembly is provided with an air intake port at one end. The exhaust assembly is provided with an exhaust port at one end. The air intake end and the exhaust end of the combustion chamber are respectively connected to the other ends of the air intake assembly and the exhaust assembly. The EGR assembly is used for transporting part of exhaust gas generated by the combustion chamber from the exhaust assembly into the air intake assembly. The air intake assembly is provided with a humidity sensor, a middle cooler and a heating device. The humidity sensor is used for detecting the air humidity in the air intake assembly.

2. The engine EGR system of claim 1, wherein, The middle cooler is used for reducing the temperature of the gas after the air and the exhaust gas are mixed.

3. The engine EGR system of claim 2, wherein, When the air humidity is higher than a first preset humidity, the heating device is used for determining the heating temperature of the middle cooler according to a preset air humidity in the air intake assembly and the middle cooler heating temperature relationship table, and heating the middle cooler according to the heating temperature of the middle cooler. The air intake assembly comprises an air intake pipe, a mixed intake pipe and an exhaust gas intake port. One end of the air intake pipe is connected to the air intake port, and the humidity sensor is arranged in the air intake pipe. The mixed intake pipe is connected to the other end of the air intake pipe, and the middle cooler and the heating device are arranged in the mixed intake pipe.

4. The engine EGR system of claim 2, wherein, The exhaust gas intake port is arranged at the connection position of the air intake pipe and the mixed intake pipe, and is connected to the EGR assembly and used for inputting exhaust gas into the mixed intake pipe.

5. The engine EGR system of claim 2, wherein, The EGR assembly comprises an exhaust gas intake pipe and an EGR valve.

6. The engine EGR system of claim 4 or 5, wherein, One end of the exhaust gas intake pipe is connected to the exhaust assembly, and the other end is connected to the exhaust gas intake port. The EGR valve is connected in the exhaust gas intake pipe and is used for adjusting the opening degree of the EGR valve corresponding to the air humidity when the air humidity is higher than a second preset humidity. The second preset humidity is greater than the first preset humidity. The heating device is arranged in the middle cooler. The heating device is arranged outside the middle cooler. The heating device comprises a heating component, a temperature controller, a control wire harness and a temperature sensor.

7. The engine EGR system of claim 3, wherein, The heating component is used for heating the middle cooler. The temperature controller is used for controlling the heating component to heat the middle cooler to a preset temperature.

8. The engine EGR system of claim 7, wherein, The control wire harness is used for connecting the heating component and the temperature controller. The temperature sensor is used for detecting the temperature of the middle cooler. The preset temperature is determined according to the preset air humidity in the air intake assembly and the middle cooler heating temperature relationship table. The exhaust assembly comprises an exhaust gas exhaust pipe. One end of the exhaust gas exhaust pipe is connected to the exhaust port, and the other end is connected to one end of the exhaust gas intake pipe. The exhaust turbocharger comprises a turbine part, a connecting shaft and a supercharging part. The connecting shaft is connected to the turbine part and the supercharging part at two ends. The turbine part is arranged in the exhaust gas exhaust pipe and is used for driving the connecting shaft to rotate. The supercharging part is arranged in the air intake pipe and is used for compressing the air in the air intake pipe.

9. The engine EGR system of claim 2, wherein, Also comprising: An air filter, which is arranged at one end of the air intake pipe close to the air intake port, for filtering the air entering the air intake pipe through the air intake port.

10. An engine EGR method comprising the engine EGR system according to any one of claims 1 to 9, characterized by, Comprising: Detecting the air humidity in the air intake assembly by a humidity sensor; If the air humidity is higher than a first preset humidity, heating the intercooler to a preset temperature by a heating device; Intaking air into the combustion chamber through the air intake assembly; Discharging the exhaust gas of the combustion chamber through the exhaust assembly; Transporting part of the exhaust gas from the exhaust assembly into the air intake assembly by the EGR assembly.

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