Engine waste gas circulating system

Abstract

The invention relates to an engine exhaust gas circulation system. The engine exhaust gas circulation system includes: an engine; the first end of the waste gas cooler is connected with the exhaust end of the engine, and the waste gas cooler is used for cooling high-temperature waste gas exhausted by the engine; the first end of the gas supercharging assembly is connected with the exhaust end of the engine, and the second end of the gas supercharging assembly is connected with the gas inlet end of the engine; the first end of the waste gas ejector is connected with the waste gas cooler, the second end of the waste gas ejector is connected with the third end of the gas supercharging assembly, and the third end of the waste gas ejector is connected with the gas inlet end of the engine; the exhaust end of the engine and the first end of the gas supercharging assembly are both connected with the waste gas treater. According to the engine, the waste gas is introduced into the gas inlet system through the waste gas ejector, the temperature of the waste gas is reduced, the energy of the waste gas is reused, and the heat efficiency of the engine is further improved.

Description

Technical Field

[0001] This application relates to the technical field of mechanical equipment, and particularly to an engine exhaust gas recirculation system. Background Art

[0002] Exhaust gas recirculation technology (EGR), as one of the effective means for internal combustion engine emission control, is widely used to reduce nitrogen oxide (NOx) emissions and improve fuel economy. Its core principle is to recycle part of the exhaust gas into the intake system during the combustion process to inhibit the generation of nitrogen oxides by reducing the combustion temperature. Exhaust gas recirculation technology is not only of great significance to environmental protection but also plays a positive role in improving the overall performance of internal combustion engines.

[0003] In related technologies, exhaust gas recirculation technology mainly relies on taking exhaust gas after the catalytic converter and then introducing it into the intake pipe. This process uses an exhaust gas ejector device to bring the exhaust gas back into the intake system to reduce NOx emissions and improve fuel economy.

[0004] However, in related technologies, the vibration of the catalytic converter and the instability of the exhaust gas flow make the connecting pipes of the exhaust gas recirculation system vulnerable to intense vibration, resulting in pipe rupture or damage. In addition, the resistance of the catalytic converter increases the working load of the exhaust gas recirculation system, causing low exhaust gas recirculation efficiency. Summary of the Invention

[0005] Based on this, it is necessary to provide an engine exhaust gas recirculation system that can bring the exhaust gas generated by the engine back into the intake pipe and achieve controllable exhaust gas recirculation volume under different working conditions of the engine.

[0006] In a first aspect, this application provides an engine exhaust gas recirculation system. The engine exhaust gas recirculation system includes:

[0007] An engine;

[0008] An exhaust gas cooler, the first end of which is connected to the exhaust end of the engine for cooling the high-temperature exhaust gas discharged by the engine;

[0009] A gas supercharging assembly, the first end of which is connected to the exhaust end of the engine, and the second end of which is connected to the intake end of the engine;

[0010] An exhaust gas ejector, the first end of which is connected to the second end of the exhaust gas cooler, the second end of which is connected to the third end of the gas supercharging assembly, and the third end of which is connected to the intake end of the engine;

[0011] An exhaust gas processor, to which both the exhaust end of the engine and the first end of the gas supercharging assembly are connected.

[0012] In one embodiment, the exhaust gas ejector includes an inlet section, a mixing section, a diffuser section, and an outlet section, which are connected in sequence;

[0013] The inlet section forms an exhaust gas chamber, and the exhaust gas chamber is connected to the second end of the exhaust gas cooler through an exhaust gas pipeline;

[0014] A pressurization pipeline is provided in the inlet section, and the outlet end of the pressurization pipeline is located at the connection between the inlet section and the mixing section.

[0015] In one embodiment, the gas pressurization assembly includes a supercharger, a gas compressor, and a high-pressure gas storage tank;

[0016] The first end of the supercharger is connected to the exhaust end of the engine, the second end of the supercharger is connected to the intake end of the engine, and the second end of the supercharger is also connected to the exhaust end of the gas compressor;

[0017] The exhaust end of the gas compressor is also connected to the first end of the high-pressure gas storage tank, and the second end of the high-pressure gas storage tank is connected to the second end of the exhaust gas ejector.

[0018] In one embodiment, the supercharger includes a turbine and a compressor, the turbine is connected to the exhaust end of the engine, and the compressor is connected to the intake end of the engine.

[0019] In one embodiment, the gas compressor is connected to the engine through a power connection assembly.

[0020] In one embodiment, the gas pressurization assembly further includes a solenoid valve, the first end of the solenoid valve is connected to the second end of the high-pressure gas storage tank, and the second end of the solenoid valve is connected to the second end of the exhaust gas ejector, for adjusting the amount of high-pressure gas entering the exhaust gas ejector.

[0021] In one embodiment, the gas pressurization assembly further includes an intake throttle valve, the first end of the intake throttle valve is connected to the intake end of the engine, and the second end of the supercharger and the exhaust end of the gas compressor are both connected to the second end of the intake throttle valve.

[0022] In one embodiment, the gas pressurization assembly further includes a boost bleed valve, the exhaust end of the engine, the first end of the gas pressurization assembly, and the first end of the exhaust gas cooler are all connected to the first end of the boost bleed valve, and the second end of the boost bleed valve and the first end of the supercharger are both connected to the exhaust gas processor.

[0023] In one embodiment, the engine exhaust gas recirculation system further includes a proportional valve, the exhaust end of the engine is connected to the first end of the proportional valve, and the second end of the proportional valve is connected to the second end of the exhaust gas ejector, for adjusting the amount of exhaust gas entering the exhaust gas ejector.

[0024] In one embodiment, the engine exhaust gas recirculation system further includes a control module, which is connected to the engine and used to receive engine signals.

[0025] For the above engine exhaust gas recirculation system, the exhaust gas cooler effectively reduces the temperature of the high-temperature exhaust gas discharged by the engine, enabling the exhaust gas to maintain within an appropriate temperature range when entering the exhaust gas ejector, thus avoiding overheating damage to the exhaust gas ejector and other components; the gas boosting assembly enhances the intake air volume of the engine through the supply of boosted air, improves the combustion efficiency, and enhances the power output performance; at the same time, the exhaust gas ejector introduces the exhaust gas into the intake system, not only reducing the temperature of the exhaust gas but also enabling the reuse of the exhaust gas energy, further improving the thermal efficiency of the engine. Brief Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the system architecture of the engine exhaust gas recirculation system provided for one embodiment.

[0027] Figure 2 It is a schematic diagram of the structure of the exhaust gas ejector provided for one embodiment.

[0028] Description of the Reference Numerals:

[0029] 10 - Engine, 20 - Exhaust Gas Cooler, 30 - Gas Boosting Assembly, 40 - Exhaust Gas Ejector, 50 - Exhaust Gas Processor, 60 - Control Module;

[0030] 310 - Supercharger, 320 - Gas Compressor, 330 - High-Pressure Gas Storage Tank, 340 - Solenoid Valve, 350 - Intake Throttle Valve, 360 - Boost Bleed Valve, 370 - Proportioning Valve;

[0031] 410 - Inlet Section, 420 - Mixing Section, 430 - Diffusion Section, 440 - Outlet Section, 450 - Boosting Pipeline, 460 - Exhaust Gas Pipeline. Detailed Embodiments

[0032] To make the above objects, features, and advantages of the present application more obvious and understandable, the following describes in detail the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application 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 thus should not be construed as a limitation on the present application.

[0034] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "connected to", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0038] Refer to Figure 1 , Figure 1 FIG. shows a schematic diagram of the system architecture of an engine exhaust gas recirculation system in an embodiment of the present application. The engine exhaust gas recirculation system includes an engine 10, an exhaust gas cooler 20, a gas boosting assembly 30 (not shown in the figure), an exhaust gas ejector 40, and an exhaust gas processor 50. The exhaust end of the engine 10 is respectively connected to the first end of the exhaust gas cooler 20, the first end of the gas boosting assembly 30, and the exhaust gas processor 50. The second end of the exhaust gas cooler 20 is connected to the first end of the exhaust gas ejector 40. The first end of the gas boosting assembly 30 is also connected to the exhaust gas processor 50. The second end of the gas boosting assembly 30 is respectively connected to the intake end of the engine 10 and the third end of the exhaust gas ejector 40. The third end of the gas boosting assembly 30 is connected to the second end of the exhaust gas ejector 40.

[0039] When the engine 10 is operating, it emits exhaust gas, and these exhaust gases enter the exhaust gas cooler 20 through the exhaust end of the engine 10. At the same time, the engine 10 outputs power to the gas compressor 320, and the fresh air is compressed by the compressor and stored in the high-pressure gas storage tank 330.

[0040] When it is necessary to start the exhaust gas recirculation, the cooled exhaust gas then enters the exhaust gas ejector 40. In the exhaust gas ejector 40, the high-pressure fresh air is used by the gas boosting assembly 30 to eject the exhaust gas. In this way, the exhaust gas is brought into the intake system of the engine 10.

[0041] In this process, the first end of the gas boosting assembly 30 is connected to the exhaust end of the engine 10, and thus the exhaust gas can be ejected into the exhaust gas ejector 40 when the gas boosting assembly 30 delivers the high-pressure fresh air to the exhaust gas ejector 40. The second end of the exhaust gas ejector 40 is connected to the third end of the gas boosting assembly 30, and then the mixed gas is introduced into the intake end of the engine 10 through the ejector, realizing the recycling of the exhaust gas.

[0042] In the above engine exhaust gas recirculation system, the high-temperature exhaust gas discharged from the engine 10 is effectively cooled by the exhaust gas cooler 20, so that the exhaust gas remains within a suitable temperature range when entering the exhaust gas ejector 40, avoiding overheating damage to the exhaust gas ejector 40 and other components; the gas supercharging assembly 30 enhances the intake air volume of the engine 10 through supercharged air supply, improves the combustion efficiency, and improves the power output performance; at the same time, the exhaust gas ejector 40 introduces the exhaust gas into the intake system, which not only reduces the temperature of the exhaust gas, but also enables the reuse of the exhaust gas energy, further improving the thermal efficiency of the engine 10.

[0043] Referring to Figure 2 , Figure 2 FIG. shows a schematic structural diagram of the exhaust gas ejector 40 in an embodiment of the present application. The exhaust gas ejector 40 includes an inlet section 410, a mixing section 420, a diffuser section 430, and an outlet section 440, and the inlet section 410, the mixing section 420, the diffuser section 430, and the outlet section 440 are connected in sequence. The inlet section 410 forms an exhaust gas chamber, and the exhaust gas chamber is connected to the second end of the exhaust gas cooler 20 through an exhaust gas pipeline 460. A pressurizing pipeline 450 is provided in the inlet section 410, and the outlet end of the pressurizing pipeline 450 is located at the connection between the inlet section 410 and the mixing section 420.

[0044] The exhaust gas enters the inlet section 410 of the ejector through the exhaust gas pipeline 460. A pressurizing pipeline 450 is provided in the inlet section 410, and the outlet end of the pressurizing pipeline 450 is located at the connection between the inlet section 410 and the mixing section 420. The function of the pressurizing pipeline 450 is to increase the exhaust gas flow rate by pressurization to ensure that the exhaust gas can smoothly enter the mixing section 420. The exhaust gas is mixed with other fluids (such as air or other gases) in the mixing section 420 to make the composition of the exhaust gas uniform. Then the mixed exhaust gas flows through the diffuser section 430, where the flow rate of the exhaust gas gradually slows down and the gas flow is evenly distributed. Finally, after passing through the diffuser section 430, the exhaust gas is discharged through the outlet section 440.

[0045] Continuing to refer to Figure 1 , the gas supercharging assembly 30 includes a supercharger 310, a gas compressor 320, and a high-pressure gas storage tank 330. The first end of the supercharger 310 is connected to the exhaust end of the engine 10, the second end of the supercharger 310 is connected to the intake end of the engine 10, the second end of the supercharger 310 is also connected to the exhaust end of the gas compressor 320, the exhaust end of the gas compressor 320 is also connected to the first end of the high-pressure gas storage tank 330, and the second end of the high-pressure gas storage tank 330 is connected to the second end of the exhaust gas ejector 40.

[0046] The first end of the supercharger 310 is connected to the exhaust end of the engine 10, and the exhaust gas enters the supercharger 310 through the exhaust system. The turbine inside the supercharger 310 rotates at high speed under the push of the exhaust gas, thereby increasing the pressure of the exhaust gas.

[0047] Meanwhile, the gas compressor 320 is responsible for obtaining fresh air from the outside and pressurizing it. The air enters the system through the gas compressor 320 and is pressurized to a higher pressure inside the compressor. The pressurized air enters the high-pressure gas storage tank 330 for storage and awaits use when needed. The function of the high-pressure gas storage tank 330 is to ensure that when the engine 10 requires more air to support high-performance operation, an adequate air source can be provided. During the exhaust gas ejecting process, the air in the high-pressure gas storage tank 330 is transmitted through a pipeline to the exhaust gas ejector 40 to inject pressurized air into the exhaust system of the engine 10. In one embodiment, the gas compressor 320 is connected to the engine 10 through a power connection assembly, and the power connection assembly includes, but is not limited to, belts and gears, etc.

[0048] Continue to refer to Figure 1 , the supercharger 310 includes a turbine and a compressor. The turbine is connected to the exhaust end of the engine 10, and the compressor is connected to the intake end of the engine 10.

[0049] The supercharger 310 operates through the cooperation of the turbine and the compressor. The turbine is located at the first end of the supercharger 310 and is connected to the exhaust end of the engine 10. The exhaust gas enters the supercharger 310 through the exhaust system and drives the turbine to rotate at high speed. The rotation of the turbine increases the pressure of the exhaust gas, and this pressurized exhaust gas is then guided to the compressor. The compressor is responsible for sucking fresh air from the outside and pressurizing the pressurized exhaust gas.

[0050] Continue to refer to Figure 1 , the gas boosting assembly 30 further includes a solenoid valve 340. The first end of the solenoid valve 340 is connected to the second end of the high-pressure gas storage tank 330, and the second end of the solenoid valve 340 is connected to the second end of the exhaust gas ejector 40.

[0051] The first end of the solenoid valve 340 is connected to the second end of the high-pressure gas storage tank 330, and the second end is connected to the second end of the exhaust gas ejector 40. Its main function is to control the gas flow from the high-pressure gas storage tank 330 to the exhaust gas ejector 40, thereby precisely adjusting the working state of the exhaust gas ejector 40.

[0052] During the working process, the high-pressure gas stored in the high-pressure gas storage tank 330 is provided for the exhaust gas ejector 40 to use. The solenoid valve 340 adjusts the gas flow through an electric control signal according to the needs of the system. When the engine 10 operates and requires more high-pressure gas, the solenoid valve 340 opens more channels to allow more gas to enter the exhaust gas ejector 40. When it is necessary to reduce the gas flow, the solenoid valve 340 closes some channels to reduce the amount of gas entering the exhaust gas ejector 40.

[0053] Continue to refer to Figure 1, the gas supercharging assembly 30 further includes an intake throttle valve 350. The first end of the intake throttle valve 350 is connected to the intake end of the engine 10, and the second end of the supercharger 310 and the exhaust end of the gas compressor 320 are both connected to the second end of the intake throttle valve 350.

[0054] The first end of the intake throttle valve 350 is connected to the intake end of the engine 10, and the second end is respectively connected to the second end of the supercharger 310 and the exhaust end of the gas compressor 320. Its main function is to regulate the air flow into the engine 10, thereby controlling the intake air volume and combustion efficiency of the engine 10.

[0055] When the engine 10 is running, the intake throttle valve 350 adjusts the air flow according to the driver's acceleration demand. Under low load conditions, the intake throttle valve 350 is partially opened to reduce the air volume entering the engine 10 to maintain fuel economy. As the acceleration demand increases, the throttle valve gradually opens to allow more air to enter the engine 10 to increase the output power of the engine 10. The second end of the supercharger 310 is connected to the intake throttle valve 350. The supercharger 310 ensures that the air entering the engine 10 is denser by providing high-pressure air, thereby improving combustion efficiency and power output. At the same time, the exhaust end of the gas compressor 320 also supplies compressed air to the engine 10 through the intake throttle valve 350.

[0056] Continue to refer to Figure 1 , the gas supercharging assembly 30 further includes a supercharger bleed valve 360. The exhaust end of the engine 10, the first end of the gas supercharging assembly 30, and the first end of the exhaust gas cooler 20 are all connected to the first end of the supercharger bleed valve 360. The second end of the supercharger bleed valve 360 and the first end of the supercharger 310 are both connected to the exhaust gas processor 50.

[0057] When the load of the engine 10 is high, the supercharger 310 works to provide high-pressure gas, and the supercharger bleed valve 360 maintains the optimal working pressure of the supercharger 310 by regulating the exhaust gas flow. When the supercharger 310 generates excessive pressure, the supercharger bleed valve 360 will automatically open to release the excess exhaust gas to the exhaust gas processor 50, thereby avoiding damage to the system caused by overboost. The second end of the supercharger bleed valve 360 is connected to the first end of the supercharger 310, ensuring that the exhaust gas can quickly flow into the exhaust gas processor 50 after passing through the bleed valve.

[0058] Continue to refer to Figure 1 , the engine exhaust gas recirculation system further includes a proportional valve 370. The exhaust end of the engine 10 is connected to the first end of the proportional valve 370, and the second end of the proportional valve 370 is connected to the second end of the exhaust gas ejector 40 for adjusting the exhaust gas volume entering the exhaust gas ejector 40.

[0059] The first end of the proportional valve 370 is connected to the exhaust end of the engine 10, and the second end is connected to the second end of the exhaust gas ejector 40. Through the proportional valve 370, the system can precisely control the amount of exhaust gas entering the exhaust gas ejector 40. When the working load of the engine 10 changes, the proportional valve 370 adjusts the flow rate of the exhaust gas according to the demand to ensure an appropriate amount of exhaust gas enters the exhaust gas ejector 40, thereby adjusting the exhaust gas supercharging amount. Through this adjustment mechanism, the proportional valve 370 ensures that the exhaust gas ejector 40 can operate at the best efficiency, avoiding too much or too little exhaust gas, and ensuring the stability of the supercharging effect and the efficient operation of the engine 10.

[0060] Continue to refer to Figure 1 , the engine exhaust gas recirculation system further includes a control module 60, and the control module 60 is connected to the engine 10. The control module 60 receives signals from the engine 10, including but not limited to speed, load, etc., and can output electrical signals to adjust the actions of each valve.

[0061] In an exemplary embodiment, an engine exhaust gas recirculation system is provided, which includes an engine 10, an exhaust gas cooler 20, a gas supercharging assembly 30, an exhaust gas ejector 40, an exhaust gas processor 50, a proportional valve 370, and a control module 60.

[0062] The exhaust end of the engine 10 is respectively connected to the first end of the exhaust gas cooler 20, the first end of the gas supercharging assembly 30, and the exhaust gas processor 50. The second end of the exhaust gas cooler 20 is connected to the first end of the exhaust gas ejector 40. The first end of the gas supercharging assembly 30 is also connected to the exhaust gas processor 50. The second end of the gas supercharging assembly 30 is respectively connected to the intake end of the engine 10 and the third end of the exhaust gas ejector 40. The third end of the gas supercharging assembly 30 is connected to the second end of the exhaust gas ejector 40. The exhaust end of the engine 10 is connected to the first end of the proportional valve 370, and the second end of the proportional valve 370 is connected to the second end of the exhaust gas ejector 40. The control module 60 is connected to the engine 10.

[0063] The exhaust gas ejector 40 includes an inlet section 410, a mixing section 420, a diffuser section 430, and an outlet section 440, and the inlet section 410, the mixing section 420, the diffuser section 430, and the outlet section 440 are connected in sequence. The inlet section 410 forms an exhaust gas chamber, and the exhaust gas chamber is connected to the second end of the exhaust gas cooler 20 through an exhaust gas pipeline 460. A supercharging pipeline 450 is provided in the inlet section 410, and the outlet end of the supercharging pipeline 450 is located at the connection between the inlet section 410 and the mixing section 420.

[0064] The gas boosting assembly 30 includes a supercharger 310, a gas compressor 320, a high-pressure gas storage tank 330, a solenoid valve 340, an intake throttle valve 350 and a boosting and releasing valve 360. The first end of the supercharger 310 is connected to the exhaust end of the engine 10, the second end of the supercharger 310 is connected to the intake end of the engine 10, the second end of the supercharger 310 is also connected to the exhaust end of the gas compressor 320, the exhaust end of the gas compressor 320 is also connected to the first end of the high-pressure gas storage tank 330, and the second end of the high-pressure gas storage tank 330 is connected to the second end of the exhaust gas ejector 40. The first end of the solenoid valve 340 is connected to the second end of the high-pressure gas storage tank 330, and the second end of the solenoid valve 340 is connected to the second end of the exhaust gas ejector 40. The first end of the intake throttle valve 350 is connected to the intake end of the engine 10, and the second end of the supercharger 310 and the exhaust end of the gas compressor 320 are both connected to the second end of the intake throttle valve 350. The exhaust end of the engine 10, the first end of the gas supercharging assembly 30 and the first end of the exhaust gas cooler 20 are all connected to the first end of the supercharging bleed valve 360, and the second end of the supercharging bleed valve 360 ​​and the first end of the supercharger 310 are all connected to the exhaust gas processor 50. The supercharger 310 includes a turbine and a compressor, the turbine is connected to the exhaust end of the engine 10, and the compressor is connected to the intake end of the engine 10. The gas compressor 320 is connected to the engine 10 through a power connection assembly, which includes but is not limited to belts and gears.

[0065] During the operation of the engine 10, the exhaust gas enters the exhaust gas cooler 20 through the exhaust end for cooling, and then enters the exhaust gas ejector 40. At this time, the high-pressure fresh air is compressed by the gas compressor 320 and stored in the high-pressure gas storage tank 330. When the exhaust gas circulation needs to be started, the cooled exhaust gas enters the intake system of the engine 10 through the exhaust gas ejector 40. In the exhaust gas ejector 40, the gas booster assembly 30 uses high-pressure air to eject the exhaust gas into the mixing section 420, and ensures that the exhaust gas and air are fully mixed through the booster pipe 450 and the mixing section 420. The mixed exhaust gas enters the diffusion section 430, and is discharged through the outlet section 440 after gradually decelerating.

[0066] At the same time, the supercharger 310 uses the exhaust gas to drive the turbine to rotate through the cooperation of the turbine and the compressor, thereby increasing the exhaust gas pressure, and then pressurizes the external fresh air through the compressor. The supercharger 310 adjusts the pressure according to the load of the engine 10, and the supercharged air release valve 360 ​​is responsible for controlling the exhaust gas flow to avoid excessive supercharging.

[0067] The solenoid valve 340 controls the gas flow of the high-pressure gas storage tank 330 and adjusts the working state of the exhaust gas ejector 40. The intake throttle 350 adjusts the air flow according to the acceleration demand to ensure the best combustion efficiency. The proportional valve 370 adjusts the exhaust gas flow according to the load, optimizes the exhaust gas boost amount, and ensures that the engine 10 runs efficiently and stably.

[0068] In the above process, the control module 60 receives signals from the engine 10, including but not limited to speed, load, etc. Then, it controls the intake throttle valve 350, the proportional valve 370, the solenoid valve 340, and the supercharger bleed valve 360 according to the information. The amount of fresh air is jointly controlled by the throttle valve, the supercharger 310 bleed valve, and the solenoid valve 340. During use and control, the priority order is the throttle valve, the supercharger 310 bleed valve, and the solenoid valve 340. The amount of recirculated exhaust gas is controlled in sequence by the proportional valve 370, the solenoid valve 340, and the supercharger 310 bleed valve. During use and control, the priority order is the proportional valve 370, the solenoid valve 340, and the supercharger 310 bleed valve.

[0069] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0070] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An engine exhaust gas recirculation system, characterized in that, The engine exhaust gas recirculation system includes: An engine; An exhaust gas cooler, the first end of which is connected to the exhaust end of the engine and is used to cool the high-temperature exhaust gas discharged by the engine; A gas supercharging assembly, the first end of which is connected to the exhaust end of the engine, and the second end of which is connected to the intake end of the engine; An exhaust gas ejector, the first end of which is connected to the second end of the exhaust gas cooler, the second end of which is connected to the third end of the gas supercharging assembly, and the third end of which is connected to the intake end of the engine; An exhaust gas processor, to which both the exhaust end of the engine and the first end of the gas supercharging assembly are connected.

2. The engine exhaust gas recirculation system according to claim 1, wherein The exhaust gas ejector includes an inlet section, a mixing section, a diffuser section, and an outlet section, which are connected in sequence; The inlet section forms an exhaust gas chamber, and the exhaust gas chamber is connected to the second end of the exhaust gas cooler through an exhaust gas pipeline; A pressurizing pipeline is arranged in the inlet section, and the outlet end of the pressurizing pipeline is located at the connection between the inlet section and the mixing section.

3. The engine exhaust gas recirculation system according to claim 1, wherein The gas supercharging assembly includes a supercharger, a gas compressor, and a high-pressure gas storage tank; The first end of the supercharger is connected to the exhaust end of the engine, the second end of the supercharger is connected to the intake end of the engine, and the second end of the supercharger is also connected to the exhaust end of the gas compressor; The exhaust end of the gas compressor is also connected to the first end of the high-pressure gas storage tank, and the second end of the high-pressure gas storage tank is connected to the second end of the exhaust gas ejector.

4. The engine exhaust gas recirculation system according to claim 3, characterized in that, The supercharger includes a turbine and a compressor, the turbine is connected to the exhaust end of the engine, and the compressor is connected to the intake end of the engine.

5. The engine exhaust gas recirculation system according to claim 3, characterized in that, The gas compressor is connected to the engine through a power connection assembly.

6. The engine exhaust gas recirculation system according to claim 3, characterized in that, The gas supercharging assembly further includes an electromagnetic valve, the first end of which is connected to the second end of the high-pressure gas storage tank, and the second end of which is connected to the second end of the exhaust gas ejector, and is used to adjust the amount of high-pressure gas entering the exhaust gas ejector.

7. The engine exhaust gas recirculation system according to claim 3, wherein, The gas supercharging assembly further includes an intake throttle valve, the first end of which is connected to the intake end of the engine, and the second end of the supercharger and the exhaust end of the gas compressor are both connected to the second end of the intake throttle valve.

8. The engine exhaust gas recirculation system according to claim 3, characterized in that, The gas supercharging assembly further includes a supercharging bleed valve, to which the exhaust end of the engine, the first end of the gas supercharging assembly, and the first end of the exhaust gas cooler are all connected, and the second end of the supercharging bleed valve and the first end of the supercharger are both connected to the exhaust gas processor.

9. The engine exhaust gas recirculation system according to claim 3, characterized in that, The engine exhaust gas recirculation system further includes a proportional valve, the first end of which is connected to the exhaust end of the engine, and the second end of which is connected to the second end of the exhaust gas ejector, and is used to adjust the amount of exhaust gas entering the exhaust gas ejector.

10. The engine exhaust gas recirculation system according to claim 1, wherein The engine exhaust gas recirculation system further includes a control module, which is connected to the engine and is used to receive engine signals.

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