Engine EGR system and method

Abstract

The invention discloses an engine EGR system and method.The system comprises an air inlet assembly, an exhaust assembly, a combustion chamber and an EGR assembly, and an air inlet is formed in one end of the air inlet assembly; a waste gas exhaust port is formed in one end of the exhaust assembly; the air inlet end and the exhaust end of the combustion chamber are connected with the other ends of the air inlet assembly and the exhaust assembly correspondingly. The EGR assembly is used for transporting part of waste gas into the gas inlet assembly from the gas exhaust assembly; wherein a humidity sensor, an intercooler and a heating device are arranged in the air inlet assembly, the humidity sensor is used for detecting the humidity of air in the air inlet assembly, and the intercooler is used for reducing the temperature of gas obtained after air and waste gas are mixed; the heating device is used for heating the intercooler to the preset temperature corresponding to the air humidity when the air humidity is higher than the first preset humidity. The heating device is matched with the humidity sensor in a heating mode, so that the situation that the engine is on fire due to the fact that the air humidity is too high is prevented, and recirculation waste gas is not reduced on the premise that condensate water is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to an engine EGR system and method. Background Art

[0002] In the prior art, supercharged engines are becoming more and more common. In order to further improve the economy of the engine, an EGR (Exhaust Gas Recirculation) device is usually added to the supercharged engine, that is, part of the exhaust gas is controlled by an EGR valve to flow back to the intake pipe, mixed with fresh air, cooled by an intercooler and then enters the engine combustion chamber to burn again, thereby improving the economy of the engine.

[0003] However, when the humidity of the fresh air is too high and contains a large amount of water, a large amount of condensed water will appear when it is mixed with the high-temperature exhaust gas and passes through the intercooler. Excessive condensed water entering the combustion chamber will cause the engine to misfire, which has an extremely adverse effect on driving safety.

[0004] Currently, in order to solve the problem that the engine misfires due to too high humidity of the fresh air when mixed with the high-temperature exhaust gas, the common practice is to add a humidity sensor to the intake pipe. When the humidity sensor detects that the humidity of the fresh air is too high, it will control the opening of the EGR valve according to the measured value of the humidity sensor, that is, the higher the humidity, the less the recycled exhaust gas. Although the problem of engine misfiring can be solved, the recycled exhaust gas is reduced, deteriorating the economy of the engine. Summary of the Invention

[0005] The object of the present invention is to provide an engine EGR system and method, aiming to solve the problems in the prior art that too high air humidity will cause engine misfiring and only using a humidity sensor to control the opening of the EGR valve reduces the recycled exhaust gas.

[0006] To solve the above technical problems, the present invention is implemented through the following technical solutions: Provide an engine EGR system, including: an intake component, an exhaust component, a combustion chamber, and an EGR component. One end of the intake component is provided with an air intake port; one end of the exhaust component is provided with an exhaust gas outlet; the intake end and the exhaust end of the combustion chamber are respectively connected to the other ends of the intake component and the exhaust component; the EGR component is used to transport a part of the exhaust gas generated by the combustion chamber from the exhaust component into the intake component; wherein, a humidity sensor, an intercooler, and a heating device are arranged in the intake component. The humidity sensor is used to detect the air humidity in the intake component. The intercooler is used to reduce the temperature of the gas after the air and the exhaust gas are mixed. The heating device is used to, when the air humidity is higher than a first preset humidity, query a preset relationship table between the air humidity in the intake component and the heating temperature of the intercooler based on the current air humidity in the intake component, thereby determining the heating temperature of the intercooler, and heating the intercooler according to the heating temperature of the intercooler.

[0007] Further, the intake component includes: an air inlet pipe, a mixed inlet pipe, and an exhaust gas inlet. One end of the air inlet pipe is connected to the air intake port, and the humidity sensor is arranged in the air inlet pipe; the mixed inlet pipe is connected to the other end of the air inlet pipe, and the intercooler and the heating device are arranged in the mixed inlet pipe; the exhaust gas inlet is arranged at the connection of the air inlet pipe and the mixed inlet pipe, and the exhaust gas inlet is connected to the ERG component for inputting exhaust gas into the mixed inlet pipe.

[0008] Further, the EGR component includes: an exhaust gas inlet pipe and an EGR valve. One end of the exhaust gas inlet pipe is connected to the exhaust component, and the other end is connected to the exhaust gas inlet; the EGR valve is connected in the exhaust gas inlet pipe and is used to adjust the EGR valve to an opening corresponding to the air humidity when the air humidity is higher than a 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 sleeved outside the intercooler.

[0011] Further, the heating device includes: a heating component, a temperature controller, a control wire harness, and a temperature sensor. The heating component is used to heat the intercooler; the temperature controller is used to control the heating component to heat the intercooler to a preset temperature; the control wire harness is used to connect the heating component and the temperature controller; the temperature sensor is used to detect the temperature of the intercooler; wherein, the preset temperature is determined according to the preset relationship table between the air humidity in the intake assembly and the heating temperature of the intercooler.

[0012] Further, the exhaust assembly includes: an exhaust gas pipe, one end of the exhaust gas pipe is connected to the exhaust gas outlet, and the other end is connected to one end of the exhaust gas inlet pipe.

[0013] Further, the engine EGR system further includes: an exhaust gas turbocharger, the exhaust gas turbocharger includes a turbine section, a connecting shaft, and a supercharging section. The two ends of the connecting shaft are respectively connected to the turbine section and the supercharging section. The turbine section is arranged in the exhaust gas pipe and is used to drive the connecting shaft to rotate. The supercharging section is arranged in the air inlet pipe and is used to compress the air in the air inlet pipe.

[0014] Further, the engine EGR system further includes: an air filter, the air filter is arranged at one end of the air inlet pipe close to the air inlet, and is used to filter the air entering the air inlet pipe from the air inlet.

[0015] The present invention also provides an engine EGR method for the above-mentioned engine EGR system, including:

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

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

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

[0019] Discharge the exhaust gas in the combustion chamber through the exhaust assembly;

[0020] Transport a part of the exhaust gas from the exhaust assembly to the intake assembly through the EGR assembly.

[0021] An embodiment of the present invention provides an engine EGR system and method. The system includes: an intake assembly, an exhaust assembly, a combustion chamber, and an EGR assembly. One end of the intake assembly is provided with an air intake port; one end of the exhaust assembly is provided with an exhaust gas outlet; the intake end and the exhaust end of the combustion chamber are respectively connected to the other ends of the intake assembly and the exhaust assembly; the EGR assembly is used to transport a part of the exhaust gas generated in the combustion chamber from the exhaust assembly to the intake assembly. Among them, a humidity sensor, an intercooler, and a heating device are arranged in the intake assembly. The humidity sensor is used to detect the air humidity in the intake assembly. The intercooler is used to reduce the temperature of the gas after the air and the exhaust gas are mixed. The heating device is used to heat the intercooler to a preset temperature corresponding to the air humidity when the air humidity is higher than the first preset humidity. The present invention prevents the engine from misfiring due to excessive air humidity in a heating manner by the cooperation of the heating device and the humidity sensor, and does not cause a reduction in the recirculated exhaust gas on the premise of reducing condensate water. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. 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.

[0023] Figure 1 Structural schematic diagram of an engine EGR system provided by an embodiment of the present invention;

[0024] Figure 2 Structural schematic diagram of the heating device provided by an embodiment of the present invention;

[0025] Figure 3 Flow schematic diagram of an engine EGR method provided by an embodiment of the present invention;

[0026] Figure 4 Table of the relationship between the air humidity in the intake assembly and the heating temperature of the intercooler provided by an embodiment of the present invention;

[0027] Figure 5 Table of the relationship between the air humidity in the intake assembly and the EGR valve opening provided by an embodiment of the present invention.

[0028] Explanation of the markings in the figures:

[0029] 1. Intake assembly; 11. Air intake port; 12. Air intake pipe; 13. Mixed intake pipe; 14. Exhaust gas intake port;

[0030] 2. Exhaust assembly; 21. Exhaust gas outlet; 22. Exhaust gas exhaust pipe;

[0031] 3. Combustion chamber; 31. Intake end; 32. Exhaust end;

[0032] 4. EGR assembly; 41. Exhaust gas inlet pipe; 42. EGR valve;

[0033] 5. Humidity sensor;

[0034] 6. Intercooler;

[0035] 7. Heating device; 71. Heating component; 72. Temperature controller; 73. Control wire harness; 74. Temperature sensor;

[0036] 8. Exhaust gas turbocharger; 81. Turbine section; 82. Connecting shaft; 83. Supercharging section;

[0037] 9. Air filter. Detailed implementation manner

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

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

[0041] It should be further understood that the term " / and / " used in this specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0042] In the present invention, the coasting of the vehicle does not include coasting under the braking state. Since braking triggers the braking energy recovery, the first consideration at this time is safety, and energy recovery is carried out on the premise of safety. The magnitude setting of energy recovery depends on multiple aspects, such as the braking system structure, the torque distribution relationship between mechanical braking and electric braking, and the user braking torque demand corresponding to the braking pedal opening, etc. These are not within the setting scope of the present invention. The present invention only considers the energy recovery intensity during the coasting process under the non-braking state.

[0043] Combined with Figures 1-5 As shown, the present invention provides an engine EGR system, including: an intake assembly 1, an exhaust assembly 2, a combustion chamber 3, and an EGR assembly 4. One end of the intake assembly 1 is provided with an air intake port 11; one end of the exhaust assembly 2 is provided with an exhaust gas outlet 21; the intake end 31 and the exhaust end 32 of the combustion chamber 3 are respectively connected to the other ends of the 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 into the intake assembly 1; wherein, a humidity sensor 5, an intercooler 6, and a heating device 7 are arranged in the intake assembly 1. The humidity sensor 5 is used to detect the air humidity in the intake assembly 1. The intercooler 6 is used to reduce the temperature of the gas after the air and the exhaust gas are mixed. The heating device 7 is used to, when the air humidity is higher than the first preset humidity, query the preset relationship table between the air humidity in the intake assembly 1 and the heating temperature of the intercooler 6 based on the current air humidity in the intake assembly to determine the heating temperature of the intercooler 6, and heat the intercooler 6 according to the heating temperature of the intercooler 6.

[0044] In the embodiment of the present invention, when the engine is operating normally, air enters the intake assembly 1 from the air intake port 11 and enters the combustion chamber 3 through the intake end 31. After the air in the combustion chamber 3 burns, exhaust gas is generated. The exhaust gas enters the exhaust assembly 2 through the exhaust end 32 and is discharged from the engine through the exhaust gas outlet 21. The EGR assembly 4 transports part of the exhaust gas from the exhaust assembly 2 into the intake assembly 1. By controlling the EGR assembly 4, part of the exhaust gas is recycled into the intake assembly 1, 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. Moreover, the heating device 7 cooperates with the humidity sensor 5 to prevent the engine from misfiring due to excessive air humidity in a heating manner and does not cause a reduction in the recirculated exhaust gas on the premise of reducing condensate.

[0045] Among them, the first preset humidity is set according to the actual combustion situation of the combustion chamber 3 of the engine. The preset relationship table between the air humidity in the intake assembly 1 and the heating temperature of the intercooler 6 is as Figure 4As shown, the first column of data is the air humidity inside the intake assembly 1, and the first row of data is the initial temperature of the intercooler 6 in degrees Celsius. Taking the initial temperature of the intercooler 6 as the abscissa and the air humidity inside the intake assembly 1 as the ordinate, the output is the target temperature for the heating device 7 to heat the intercooler 6. For example, when the initial temperature of the intercooler 6 is 20 degrees Celsius and the air humidity inside the intake assembly 1 is 20%, the heating device 7 is in the off state, that is, the off state. At this time, the first preset humidity is 50%. When the air humidity inside the intake assembly 1 is 50%, the heating device 7 is turned on and heats the temperature inside the intercooler 6 to 25 degrees Celsius.

[0046] In some embodiments, the intake assembly 1 includes: an air inlet pipe 12, a mixing inlet pipe 13, and an exhaust gas inlet 14. One end of the air inlet pipe 12 is connected to the air intake 11, and the humidity sensor 5 is disposed inside the air inlet pipe 12; the mixing inlet pipe 13 is connected to the other end of the air inlet pipe 12, and the intercooler 6 and the heating device 7 are disposed inside the mixing inlet pipe 13; the exhaust gas inlet 14 is disposed at the connection of the air inlet pipe 12 and the mixing inlet pipe 13, and the exhaust gas inlet 14 is connected to the EGR assembly for inputting exhaust gas into the mixing inlet pipe 13.

[0047] In this embodiment, air enters the air inlet pipe 12 from the air intake 11, and a part of the exhaust gas generated by the combustion chamber 3 enters the connection of the air inlet pipe 12 and the mixing inlet pipe 13 from the exhaust gas inlet 14. The air and the exhaust gas are mixed in the mixing inlet pipe 13 and then enter the intercooler 6. By disposing the humidity sensor 5 inside the air inlet pipe 12 to detect the air humidity, and the intercooler 6 and the heating device 7 are disposed inside the mixing inlet pipe 13, it is convenient to heat the mixed gas inside the intercooler 6 when the air humidity detected by the humidity sensor 5 is higher than the first preset humidity, reduce the presence of condensed water, and prevent too much condensed water from entering the combustion chamber 3 and causing engine misfire.

[0048] In some embodiments, the EGR assembly 4 includes: an exhaust gas inlet pipe 41 and an EGR valve 42. One end of the exhaust gas inlet pipe 41 is connected to the exhaust assembly 2, and the other end is connected to the exhaust gas inlet 14; the EGR valve 42 is connected inside the exhaust gas inlet pipe 41 for adjusting the EGR valve 42 to the opening 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.

[0049] In this embodiment, a part of the exhaust gas generated by the combustion chamber 3 enters the exhaust gas inlet pipe 41 from the exhaust assembly 2, passes through the exhaust gas inlet pipe 41 and enters the exhaust gas inlet 14. The opening degree 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 combustion situation of the combustion chamber 3 of the engine. When the air humidity is higher than the second preset humidity, the condensate cannot be reduced only by the heating device 7. By reducing the opening degree of the EGR valve 42, that is, reducing the combustion degree in the combustion chamber 3, engine misfire can be prevented.

[0050] Among them, the second preset humidity is set according to the actual combustion situation of the combustion chamber 3 of the engine. The relationship table between the air humidity in the intake assembly 1 and the opening degree of the EGR valve 42 is as Figure 5 shown. The data in the first column is the air humidity in the intake assembly 1, and the data in the first row is the temperature of the intercooler 6, with the unit of degree Celsius. Taking the temperature of the intercooler 6 as the abscissa and the air humidity in the intake assembly 1 as the ordinate, the output is the opening degree of the EGR valve 42. For example, when the temperature of the intercooler 6 is 20 degrees Celsius, when the air humidity in the intake assembly 1 is 20%, the opening degree of the EGR valve 42 is 0.08, that is, it is opened 8%. When the air humidity in the intake assembly 1 is 50%, the opening degree of the EGR valve 42 is 0.05, that is, it is opened 5%.

[0051] In some embodiments, the heating device 7 is arranged inside the intercooler 6.

[0052] In this embodiment, arranging the heating device 7 inside the intercooler 6 facilitates detecting the temperature inside the intercooler 6, so as to judge whether it is necessary to continue heating the intercooler 6 or stop heating.

[0053] In some embodiments, the heating device 7 is sleeved outside the intercooler 6.

[0054] In this embodiment, sleeving the heating device 7 outside the intercooler 6 facilitates quickly heating the intercooler 6 and can relatively quickly reduce the presence of condensate.

[0055] In some embodiments, the heating device 7 includes: 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; among them, the preset temperature is determined according to the preset relationship table between the air humidity in the intake assembly 1 and the heating temperature of the intercooler 6, so as to determine the heating temperature of the intercooler 6.

[0056] 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, so as to prevent the mixed gas from damaging the engine due to excessive temperature while reducing the presence of condensed water.

[0057] In some embodiments, the exhaust assembly 2 includes: an exhaust gas pipe 22, one end of the exhaust gas pipe 22 is connected to the exhaust gas outlet 21, and the other end is connected to one end of the exhaust gas inlet pipe 41.

[0058] In this embodiment, a part of the exhaust gas generated by the combustion chamber 3 enters the exhaust gas inlet pipe 41, and the other part is discharged from the exhaust gas pipe 22. The exhaust gas entering the exhaust gas inlet pipe 41 is controlled according to the opening degree of the EGR valve 42.

[0059] In some embodiments, the engine EGR system further includes: an exhaust gas turbocharger 8, the exhaust gas turbocharger 8 includes a turbine section 81, a connecting shaft 82 and a supercharging section 83. The two ends of the connecting shaft 82 are respectively connected to the turbine section 81 and the supercharging section 83. The turbine section 81 is arranged in the exhaust gas pipe 22 and is used to drive the connecting shaft 82 to rotate. The supercharging section 83 is arranged in the air inlet pipe 12 and is used to compress the air in the air inlet pipe 12.

[0060] In this embodiment, the exhaust gas turbocharger 8 introduces the exhaust gas discharged from the engine into the turbine section 81, and uses the energy of the exhaust gas to drive the turbine section 81 to rotate, thereby driving the supercharging section 83 coaxial with the turbine section 81 to realize the supercharging of the air in the air inlet pipe 12, increasing the efficiency of the air entering the air inlet pipe 12, and accelerating the combustion degree in the combustion chamber 3, and further accelerating the output power of the engine.

[0061] In some embodiments, the engine EGR system further includes: an air filter 9, the air filter 9 is arranged at one end of the air inlet pipe 12 close to the air inlet 11, and is used to filter the air entering the air inlet pipe 12 from the air inlet 11.

[0062] In this embodiment, filtering the air entering the air inlet pipe 12 from the air inlet 11 through the air filter 9 can reduce the impurities in the air and, to a certain extent, reduce the moisture in the air, thereby reducing the amount of condensed water.

[0063] The present invention also provides an engine EGR method for the above-mentioned engine EGR system, and the steps include S10 to S50:

[0064] S10. Detect the air humidity in the intake assembly 1 through the humidity sensor 5;

[0065] S20. If the air humidity is higher than the first preset humidity, heat the intercooler 6 to the preset temperature through the heating device 7;

[0066] S30. Intake air into the combustion chamber 3 through the intake assembly 1;

[0067] S40. Discharge the exhaust gas from the combustion chamber 3 through the exhaust assembly 2;

[0068] S50. Transport part of the exhaust gas from the exhaust assembly 2 to the intake assembly 1 through the EGR assembly 4.

[0069] In the embodiment of the present invention, air enters the combustion chamber 3 from the intake assembly 1. After the air in the combustion chamber 3 burns, exhaust gas is generated. The exhaust gas is discharged from the engine through the exhaust assembly 2. The EGR assembly 4 transports part of the exhaust gas from the exhaust assembly 2 to the intake assembly 1. By controlling the EGR assembly 4, part of the exhaust gas is recycled back into the intake assembly 1, 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. Moreover, the heating device 7 cooperates with the humidity sensor 5 to prevent the engine from misfiring due to excessive air humidity in a heating manner, and without reducing the recirculated exhaust gas on the premise of reducing condensate.

[0070] Among them, steps S10 to S50 are only for convenient understanding and do not represent the order of steps. In actual application scenarios, steps S10 to S50 are generally carried out simultaneously.

[0071] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An engine EGR system, characterized in that: include: An air intake assembly, one end of which is provided with an air intake port; An exhaust assembly, one end of which is provided with an exhaust gas outlet; A combustion chamber, wherein the air intake end and the exhaust end of the combustion chamber are respectively connected to the other end of the air intake assembly and the other end of the exhaust assembly; An EGR component, the EGR component is used to transport part of the exhaust gas generated by the combustion chamber from the exhaust component to the intake component; Among them, a humidity sensor, an intercooler and a heating device are arranged in the air intake component, the humidity sensor is used to detect the air humidity in the air intake component, the intercooler is used to reduce the temperature of the gas after the air and exhaust gas are mixed, and the heating device is used to use the current air humidity in the air intake component to query the preset relationship table of the air humidity in the air intake component and the heating temperature of the intercooler when the air humidity is higher than the first preset humidity, so as to determine the heating temperature of the intercooler, and heat the intercooler according to the heating temperature of the intercooler.

2. The engine EGR system according to claim 1, characterized in that: The air intake assembly comprises: An air intake pipe, one end of which is connected to the air inlet port, and the humidity sensor is arranged in the air intake pipe; A mixing intake pipe, the mixing intake pipe is connected to the other end of the air intake pipe, the intercooler and the heating device are arranged in the mixing intake pipe; An exhaust gas inlet port is arranged at the connection between the air intake pipe and the mixing intake pipe, and the exhaust gas inlet port is connected to the ERG component to input the exhaust gas into the mixing intake pipe.

3. The engine EGR system according to claim 2, characterized in that: The EGR component comprises: An exhaust gas intake pipe, one end of which is connected to the exhaust assembly, and the other end of which is connected to the exhaust gas intake port; An EGR valve, the EGR valve being connected to the exhaust gas intake pipe and being used for adjusting the EGR valve to an opening corresponding to the air humidity when the air humidity is higher than a second preset humidity; Wherein, the second preset humidity is greater than the first preset humidity.

4. The engine EGR system according to claim 2, characterized in that: The heating device is arranged in the intercooler.

5. The engine EGR system according to claim 2, characterized in that: The heating device is sleeved outside the intercooler.

6. The engine EGR system according to claim 4 or 5, characterized in that: The heating device comprises: a heating component, the heating component being used to heat the intercooler; a temperature controller, the temperature controller being used to control the heating component to heat the intercooler to a preset temperature; A control harness, the control harness being used to connect the heating component and the temperature controller; A temperature sensor, the temperature sensor is used to detect the temperature of the intercooler; The preset temperature is determined according to a preset relationship table between the air humidity in the air intake assembly and the heating temperature of the intercooler to determine the heating temperature of the intercooler.

7. The engine EGR system according to claim 3, characterized in that: The exhaust assembly comprises: An exhaust gas exhaust pipe, one end of which is connected to the exhaust gas exhaust port, and the other end of which is connected to one end of the exhaust gas intake pipe.

8. The engine EGR system according to claim 7, characterized in that: Also includes: An exhaust gas turbocharger comprises a turbine part, a connecting shaft and a supercharging part, wherein the two ends of the connecting shaft are respectively connected to the turbine part and the supercharging part, the turbine part is arranged in the exhaust gas exhaust pipe to drive the connecting shaft to rotate, and the supercharging part is arranged in the air intake pipe to compress the air in the air intake pipe.

9. The engine EGR system according to claim 2, characterized in that: Also includes: An air filter is arranged at one end of the air intake pipe close to the air intake port, and is used 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 in that: include: Detecting the air humidity in the air intake assembly by means of 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; Air is introduced into the combustion chamber through the air intake assembly; Exhaust gases are discharged from the combustion chamber through an exhaust assembly; A portion of the exhaust gas is transported from the exhaust component to the intake component through the EGR component.

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