Resonant drive EGR system and engine assembly

Abstract

The invention relates to a resonance drive EGR system and an engine assembly. The resonance-driven EGR system includes: a resonance chamber; the resonant tube is communicated with the inlet of the resonant chamber and the exhaust port; the Venturi tube is provided with a power gas inlet, a suction inlet and a gas outlet, the power gas inlet is communicated with the outlet of the gas supply device, the suction inlet is communicated with the outlet of the resonance chamber, and the gas outlet is communicated with the gas inlet. Resonance waves are generated by waste gas at a specific frequency under the combined action of the resonance chamber and the resonance tube, so that pressure waves of the waste gas are amplified, the EGR rate is improved, a low-pressure area is formed at the throat when air provided by the air supply device passes through the Venturi tube, the low-pressure area is beneficial to attracting more waste gas to be mixed with the air, and the EGR effect is improved. Therefore, the inflow amount of the waste gas is increased, the waste gas can enter the engine body more easily, and the EGR rate of the whole system is improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a resonantly driven EGR system and an engine assembly device and method. Background Art

[0002] The EGR (Exhaust Gas Recirculation) system is a control system for automobile engines. Its main purpose is to reintroduce part of the exhaust gas discharged by the engine into the intake system, mix it with fresh air and then re-enter the cylinder for combustion. Exhaust gas recirculation can improve the combustion process of the engine to a certain extent, and improve the fuel economy and power performance of the engine.

[0003] However, under certain specific operating conditions, especially in the low-speed and high-load area, it is difficult for EGR gas to enter the engine, which is not conducive to improving the engine's combustion efficiency and reducing emissions. Summary of the invention

[0004] Based on this, it is necessary to provide a resonantly driven EGR system and engine assembly to address the problem that under certain specific operating conditions of the EGR system, EGR gas is difficult to enter the engine, which is not conducive to improving the combustion efficiency of the engine and reducing emissions.

[0005] A resonance-driven EGR system is applied to an engine assembly, the engine assembly comprising an engine body and an air supply device, the engine body being provided with an air inlet and an exhaust port, the resonance-driven EGR system comprising: a resonance chamber; a resonance tube connecting the inlet of the resonance chamber and the exhaust port; a venturi tube having a power gas inlet, a suction port and an air outlet, the power gas inlet being connected to the outlet of the air supply device, the suction port being connected to the outlet of the resonance chamber, and the air outlet being connected to the air inlet.

[0006] According to one embodiment of the present application, it also includes: a pressure stabilizing box connected between the resonance tube and the exhaust port.

[0007] According to one embodiment of the present application, the resonantly driven EGR system also includes: a cooler having a first heat exchange side and a second heat exchange side, the inlet of the first heat exchange side being connected to the exhaust port, and the outlet of the first heat exchange side being connected to the pressure stabilizing tank; a cooling pipeline, the cooling pipeline being connected to the second heat exchange side.

[0008] According to one embodiment of the present application, the engine body is further provided with a coolant inlet and a coolant outlet, and the cooling pipeline connects the coolant inlet and the coolant outlet.

[0009] According to one embodiment of the present application, the engine assembly further includes: a radiator, the inlet of the radiator is connected to the outlet of the second heat exchange side through the cooling pipeline, and the outlet of the radiator is connected to the coolant inlet through the cooling pipeline.

[0010] According to one embodiment of the present application, it further includes: a throttle valve; an intercooler, wherein the inlet of the intercooler is connected to the outlet of the air supply device, and the outlet of the intercooler is connected to the power gas inlet through the throttle valve.

[0011] According to one embodiment of the present application, it further includes: an EGR valve, and the outlet of the resonance chamber is connected to the intake port through the EGR valve.

[0012] According to one embodiment of the present application, the air supply device includes: a supercharger, wherein the turbine end of the supercharger is connected to the exhaust port, and the pressure end of the supercharger is connected to the power gas inlet.

[0013] According to one embodiment of the present application, the air supply device further includes: an air filter connected to the inlet of the air supply device.

[0014] The present application provides an engine assembly, including the resonance driven EGR system of the above embodiment.

[0015] The above-mentioned resonance-driven EGR system and engine assembly, through the combined action of the resonance chamber and the resonance tube, make the exhaust gas generate resonance waves at a specific frequency, thereby amplifying the pressure wave of the exhaust gas and thus improving the EGR rate. In addition, when the air provided by the air supply device passes through the Venturi tube, a low-pressure area is formed at the throat. The low-pressure area helps to attract more exhaust gas to mix with the air, thereby increasing the inflow of exhaust gas, making it easier for the exhaust gas to enter the engine body, thereby improving the EGR rate of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of the structure of a resonantly driven EGR system provided in an embodiment of the present application in a usage scenario.

[0017] 1. Engine body; 2. Supercharger; 3. After-processor; 4. Air filter; 5. Intercooler; 6. Radiator; 7. Throttle; 8. EGR valve; 9. Cooler; 10. Voltage stabilizer box; 11. Resonance tube; 12. Resonance chamber; 13. Venturi tube. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of 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 violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0019] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0020] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0022] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0024] FIG1 is a schematic diagram of the structure of a resonance-driven EGR system provided in an embodiment of the present application in a usage scenario. Referring to FIG1 , the resonance-driven EGR system provided in an embodiment of the present application is applied to an engine assembly, and the engine assembly includes an engine body 1 and an air supply device, and the engine body 1 is provided with an air intake port and an exhaust port. In this embodiment, the air supply device can provide air to the air intake port of the engine body 1, increase the engine intake pressure, and improve the output power and efficiency of the engine body 1.

[0025] The resonance driven EGR system of this embodiment includes a resonance chamber 12 , a resonance tube 11 and a venturi tube 13 .

[0026] The resonance tube 11 connects the inlet and the exhaust port of the resonance chamber 12 , and the exhaust gas discharged from the exhaust port can enter the resonance chamber 12 through the resonance tube 11 .

[0027] The function of the resonance tube 11 is to adjust the vibration frequency. The resonance tube 11 is designed to design the gas flow path so that the gas can generate fluctuations of a specific frequency when passing through, thereby preparing for the subsequent resonance process. The resonance tube 11 is usually based on the acoustic principle, and the resonance frequency is adjusted by changing the length or diameter of the tube to meet the needs of different engine speeds. The length and diameter of the resonance tube 11 can be determined through calculation and testing to ensure that under specific working conditions, the gas can generate fluctuations of a specific frequency when flowing. In this embodiment, the specific size and shape of the resonance tube 11 are not specifically limited.

[0028] A closed chamber is formed inside the resonance chamber 12, and its volume and size can be determined according to the EGR rate required by the engine. When the exhaust gas passes through the resonance tube 11, a pressure wave is formed in the resonance chamber 12, and the pressure wave can be reflected and superimposed in the resonance chamber 12. By optimizing the structural dimensions of the resonance chamber 12, the fluctuations generated during gas flow can be enhanced, so that the gas resonates at a specific frequency, thereby amplifying the pressure wave of the EGR gas, thereby improving the EGR rate. In this embodiment, the specific size and shape of the resonance chamber 12 are not specifically limited.

[0029] Among them, the venturi tube 13 has a power gas inlet, a suction port and an air outlet. The power gas inlet is connected to the outlet of the air supply device, the suction port is connected to the outlet of the resonance chamber 12, and the air outlet is connected to the air inlet. The venturi tube 13 plays a vital role in the resonance-driven EGR (exhaust gas recirculation) system of the natural gas engine. The air provided by the air supply device enters the venturi tube 13 through the power gas inlet, and the exhaust gas flowing out of the resonance chamber 12 enters the venturi tube 13 through the suction port. The venturi tube 13 uses the wall pressure drop caused by the high-speed airflow generated when the air supplied by the air supply device flows through the venturi throat to create a pressure difference between EGR (exhaust gas) and air, thereby further improving the EGR rate. Specifically, when the air provided by the air supply device passes through the venturi tube 13, a low-pressure area will be formed at the throat. This low-pressure area helps to attract more exhaust gas to mix with the air, thereby increasing the inflow of exhaust gas, and then improving the EGR rate of the entire system. It helps to overcome the problem of EGR gas being difficult to enter the engine under specific operating conditions, especially in the low-speed and high-load area, thereby improving the engine's combustion efficiency and reducing emissions.

[0030] In some embodiments of the present application, the resonance driven EGR system further includes a pressure stabilizing tank 10 , and the pressure stabilizing tank 10 is connected between the resonance pipe 11 and the exhaust port.

[0031] In the direction of exhaust gas flow, the pressure regulator tank 10 is located upstream of the resonance tube 11, and its function is to stabilize the exhaust pulse. The pressure regulator tank 10 has a relatively large space inside, which can accommodate a certain amount of gas, so as to buffer the pressure fluctuations generated by the resonance system, prevent these fluctuations from interfering with the normal exhaust process of the engine, and also ensure the stable operation of the EGR system.

[0032] In some embodiments of the present application, the resonantly driven EGR system also includes a cooler 9 and a cooling pipeline, the cooler 9 has a first heat exchange side and a second heat exchange side, the inlet of the first heat exchange side is connected to the exhaust port, and the outlet of the first heat exchange side is connected to the pressure stabilizing tank 10; the cooling pipeline is connected to the second heat exchange side.

[0033] The exhaust gas from the exhaust port first enters the cooler 9 through the inlet of the first heat exchange side, where the exhaust gas exchanges heat with the cooling medium (such as coolant), and the heat of the exhaust gas is absorbed by the cooling medium, thereby reducing the temperature of the exhaust gas. The cooled exhaust gas flows out from the outlet of the first heat exchange side and then enters the pressure regulator tank 10.

[0034] The cooling pipeline is connected to the second heat exchange side of the cooler 9, and the cooling medium (such as coolant) reaches the second heat exchange side of the cooler 9 through the cooling pipeline, where it continues to exchange heat with the exhaust gas. After the cooling medium completes the heat exchange, it returns to the cooling system through the cooling pipeline and continues to be circulated.

[0035] Furthermore, the engine body 1 is also provided with a coolant inlet and a coolant outlet, and a cooling pipeline connects the coolant inlet and the coolant outlet.

[0036] The coolant of the engine body 1 enters the cooling pipeline through the coolant outlet, and reaches the second heat exchange side of the cooler 9 through the cooling pipeline, where the coolant exchanges heat with the exhaust gas and absorbs the heat in the exhaust gas. Subsequently, the coolant with a raised temperature enters the cooling cycle of the engine body 1 through the cooling pipeline to cool down, and then circulates back to the coolant inlet, and the cycle repeats. In this embodiment, the cooler 9 is connected to the cooling cycle of the engine body 1 through the cooling pipeline, so that the cooler 9 can use the coolant circulation system of the engine itself to complete the cooling of the exhaust gas, which not only simplifies the complexity of the system and reduces the cost, but also avoids the problems of increased weight, energy consumption and maintenance complexity caused by the introduction of additional cooling cycles. In addition, the exhaust gas is effectively cooled before entering components such as the voltage regulator box 10, the resonance tube 11 and the resonance chamber 12, which can improve the efficiency and reliability of the system.

[0037] Optionally, the engine assembly further includes a radiator 6, the inlet of the radiator 6 is connected to the outlet of the second heat exchange side through a cooling pipeline, and the outlet of the radiator 6 is connected to the coolant inlet through the cooling pipeline. In this embodiment, the cooling pipeline includes a first pipeline and a second pipeline, the inlet of the radiator 6 is connected to the outlet of the second heat exchange side through the first pipeline, and the outlet of the radiator 6 is connected to the coolant inlet through the second pipeline.

[0038] The above arrangement enables the cooling system to operate in a closed loop, ensuring that the coolant circulates between the engine body 1, the cooler 9, and the radiator 6 without the need for an additional cooling cycle power structure and a heat dissipation structure. The heat in the exhaust gas is effectively transferred out to ensure that the exhaust gas has been cooled to a suitable temperature before entering the engine cylinder, thereby improving EGR efficiency and reliability. At the same time, this integrated cooling solution simplifies the complexity of the system, reduces costs, and improves the overall efficiency of the system.

[0039] In some embodiments, the resonance driven EGR system further includes a throttle valve 7 and an intercooler 5 , wherein the inlet of the intercooler 5 is connected to the outlet of the air supply device, and the outlet of the intercooler 5 is connected to the power gas inlet through the throttle valve 7 .

[0040] The main function of the intercooler 5 is to cool the air before it enters the engine. Before entering the intercooler 5, the air is first processed by the air supply device, and then the cooling effect of the intercooler 5 reduces the temperature of the air and increases its density, so that a higher quality air mixture can be provided to the engine. The throttle valve 7 is located after the outlet of the intercooler 5. The main function of the throttle valve 7 is to control the amount of air entering the engine. The driver controls the opening of the throttle valve 7 through the accelerator pedal. The above-mentioned setting ensures that the air entering the engine has a lower temperature and higher density, which is conducive to improving the combustion efficiency of the engine, and also provides better conditions for the effective operation of the EGR system.

[0041] In some embodiments, the resonance driven EGR system further includes an EGR valve 8 , and the outlet of the resonance chamber 12 is connected to the intake port through the EGR valve 8 .

[0042] The EGR valve 8 is arranged downstream of the resonance chamber 12, and its function is to control the size of the EGR rate. When the exhaust gas that has passed through the resonance chamber 12 to amplify the resonance wave passes through the EGR valve 8, the EGR valve 8 will adjust its opening according to pre-set parameters (such as engine speed, load, etc.), thereby controlling the amount of exhaust gas entering the engine body 1. By accurately controlling the amount of exhaust gas introduced, the mixed gas composition of the engine body 1 can be optimized to make it closer to the theoretical air-fuel ratio, thereby improving combustion efficiency and reducing nitrogen oxide (NOx) emissions.

[0043] In addition, the EGR valve 8 also protects the engine body 1, preventing the introduction of excessive exhaust gas from causing performance degradation or malfunction of the engine body 1. Therefore, the EGR valve 8 ensures that the engine can operate effectively under different working conditions while also ensuring the safety and reliability of the system.

[0044] The EGR valve 8 in this embodiment may be a butterfly valve, a ball valve, a solenoid valve, etc., which is not specifically limited here.

[0045] In some embodiments, the air supply device includes a supercharger 2, a turbine end of the supercharger 2 is connected to an exhaust port, and a pressure end of the supercharger 2 is connected to a power gas inlet.

[0046] In this embodiment, the vortex end (i.e., turbine end) of the supercharger 2 is connected to the exhaust port of the engine, and the exhaust gas enters the vortex end through the exhaust port, and the energy of the exhaust gas is used to drive the turbine to rotate. The compression end (i.e., the air pressure end) is connected to the power air inlet of the venturi tube 13, and the rotation of the turbine drives the coaxial compression end blades to rotate, and the compression end blades compress the air and send it into the venturi tube 13.

[0047] As a result, the supercharger 2 can use the energy of the exhaust gas to drive the compression end, thereby increasing the density of the air entering the venturi tube 13, and then increasing the density of the air entering the engine body 1, thereby improving the output power and efficiency of the engine. Specifically, the engine body 1 can use the exhaust gas energy that would otherwise be wasted to increase the intake pressure, thereby improving the combustion efficiency and engine performance. When air passes through the venturi tube 13, due to the Venturi effect (that is, the fluid speed increases and the pressure decreases when passing through a narrow channel), a low-pressure area will be generated at the throat of the venturi tube 13, thereby attracting more exhaust gas to mix with the air. Not only does it increase the density of the intake air, but it also enhances the mixing effect of the exhaust gas and air through the venturi tube 13, further improving the EGR rate, thereby optimizing the combustion process of the engine body 1 and reducing emissions.

[0048] In some embodiments, the air supply device further includes an air filter 4, and the air filter 4 is connected to the inlet of the air supply device.

[0049] In this embodiment, the type of the air filter 4 is not specifically limited, and is determined according to the specific use environment, cost considerations, and required filtering performance. For example, a paper filter or a foam filter may be used in a vehicle traveling on a city road, while a cyclone filter or an oil bath filter may be used in an industrial environment.

[0050] The air filter 4 can be connected to the supercharger 2 through a rubber interface or a dedicated connecting pipe to ensure smooth air circulation and good sealing. The air filter 4 is installed at the front end of the inlet of the air supply device, and its function is to remove impurities such as dust and sand that may exist in the air. The air filter 4 can capture tiny particles in the air to prevent these impurities from entering the engine and causing wear or other damage.

[0051] Optionally, the resonant driven EGR system provided in an embodiment of the present application further includes an after-processor 3, which is connected to the turbine end outlet of the supercharger 2. The function of the after-processor 3 is to reduce the content of harmful substances in the engine exhaust by chemical reaction or physical method. The after-processor 3 can be a three-way catalytic converter (TWC), which can process pollutants such as CO (carbon monoxide), HC (hydrocarbons) and NOx (nitrogen oxides) in the exhaust gas and convert them into substances that are less harmful to the human body and the environment, such as carbon dioxide, water and nitrogen.

[0052] The connection between the post-processor 3 and the turbine outlet of the supercharger 2 not only utilizes the energy of the exhaust gas to improve the intake efficiency, but also purifies the exhaust gas before it is discharged, reducing the impact on the environment. It helps to improve the efficiency of the engine and meet strict emission standards.

[0053] The embodiment of the present application also provides an engine assembly, including the above-mentioned resonance-driven EGR system. Since the engine assembly of this embodiment adopts the above-mentioned resonance-driven EGR system, it can effectively improve the EGR rate of the engine body 1 in the low-speed and high-load area, improve combustion stability, reduce nitrogen oxide (NOx) emissions, and improve overall efficiency.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A resonance driven EGR system, characterized in that: Applied to an engine assembly, the engine assembly includes an engine body and an air supply device, the engine body is provided with an air inlet and an exhaust port, and the resonance driven EGR system includes: Resonance chamber; A resonance pipe, communicating the inlet of the resonance chamber and the exhaust port; The venturi tube has a power gas inlet, a suction port and an air outlet, wherein the power gas inlet is connected to the outlet of the air supply device, the suction port is connected to the outlet of the resonance chamber, and the air outlet is connected to the air inlet.

2. The resonance driven EGR system according to claim 1, characterized in that: Also includes: A pressure stabilizing box is connected between the resonance tube and the exhaust port.

3. The resonance driven EGR system according to claim 2, characterized in that: The resonant drive EGR system further comprises: A cooler having a first heat exchange side and a second heat exchange side, wherein an inlet of the first heat exchange side is connected to the exhaust port, and an outlet of the first heat exchange side is connected to the pressure stabilizing tank; A cooling pipeline is communicated with the second heat exchange side.

4. The resonance driven EGR system according to claim 3, characterized in that: The engine body is also provided with a coolant inlet and a coolant outlet. The cooling pipeline is connected with the cooling liquid inlet and the cooling liquid outlet.

5. The resonance driven EGR system according to claim 4, characterized in that: The engine assembly further comprises: A radiator, wherein the inlet of the radiator is connected to the outlet of the second heat exchange side through the cooling pipeline, and the outlet of the radiator is connected to the coolant inlet through the cooling pipeline.

6. The resonance driven EGR system according to any one of claims 1 to 5, characterized in that: Also includes: Throttle; An intercooler, wherein the inlet of the intercooler is communicated with the outlet of the air supply device, and the outlet of the intercooler is communicated with the power gas inlet through the throttle valve.

7. The resonance driven EGR system according to claim 4, characterized in that: Also includes: An EGR valve, the outlet of the resonance chamber is communicated with the intake port through the EGR valve.

8. The resonance driven EGR system according to any one of claims 1 to 5, characterized in that: The gas supply device comprises: A supercharger, wherein the turbine end of the supercharger is communicated with the exhaust port, and the pressure end of the supercharger is communicated with the power gas inlet.

9. The resonance driven EGR system according to claim 8, characterized in that: The air supply device also includes: An air filter is connected to the inlet of the air supply device.

10. An engine assembly, characterized in that: It comprises the resonance driven EGR system as claimed in any one of claims 1 to 9.

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