Resonant drive EGR system and engine assembly

Abstract

This application relates to a resonant-driven EGR system and an engine assembly. The resonant-driven EGR system includes: a resonant chamber; a resonant tube connecting the inlet of the resonant chamber and the exhaust port; and a venturi tube having a power air inlet, an intake port, and an outlet. The power air inlet is connected to the outlet of the air supply device, the intake port is connected to the outlet of the resonant chamber, and the outlet port is connected to the intake port. Through the combined action of the resonant chamber and the resonant tube, the exhaust gas generates a resonant wave at a specific frequency, thereby amplifying the pressure wave of the exhaust gas and increasing the EGR rate. Furthermore, when the air supplied by the air supply device passes through the venturi tube, a low-pressure zone is formed at the throat. This low-pressure zone helps to attract more exhaust gas to mix with the air, thereby increasing the exhaust gas inflow and making it easier for the exhaust gas to enter the engine body, thus improving the overall EGR rate of the system.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to a resonant drive EGR system and engine assembly device and method. Background Technology

[0002] EGR (Exhaust Gas Recirculation) is a control system used in automotive engines. Its main purpose is to reintroduce some of the exhaust gases from the engine into the intake system, mix them with fresh air, and then re-enter the cylinders for combustion. Exhaust gas recirculation can improve the engine's combustion process to some extent, thereby increasing fuel economy and power performance.

[0003] However, under certain operating conditions, especially in the low-speed, high-load range, EGR gas has difficulty entering the engine, which is detrimental to improving engine combustion efficiency and reducing emissions. Summary of the Invention

[0004] Therefore, it is necessary to provide a resonant drive EGR system and engine assembly to address the problem that EGR gas is difficult to enter the engine under certain operating conditions, which is not conducive to improving engine combustion efficiency and reducing emissions.

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

[0006] According to one embodiment of this application, it further includes: a voltage regulator box connected between the resonant tube and the exhaust port.

[0007] According to one embodiment of this application, the resonant drive EGR system further 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 voltage regulator box; and a cooling pipe connected to the second heat exchange side.

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

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

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

[0011] According to one embodiment of this application, it further includes: an EGR valve, wherein the outlet of the resonant chamber is connected to the inlet via the EGR valve.

[0012] According to one embodiment of this application, the gas supply device includes: a booster, wherein the booster's vortex end is connected to the exhaust port, and the booster's pressure end is connected to the power gas inlet.

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

[0014] This application provides an engine assembly including the resonant drive EGR system of the above embodiments.

[0015] The aforementioned resonant drive EGR system and engine assembly, through the combined action of the resonant chamber and resonant tube, generate resonant waves in the exhaust gas at a specific frequency, thereby amplifying the pressure wave of the exhaust gas and thus improving the EGR rate. Furthermore, when the air supplied by the air supply device passes through the venturi tube, a low-pressure zone is formed at the throat. This low-pressure zone helps to attract more exhaust gas to mix with the air, thereby increasing the inflow of exhaust gas and making it easier for the exhaust gas to enter the engine body, thus improving the EGR rate of the entire system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the resonant drive EGR system provided in an embodiment of this application under a specific usage scenario.

[0017] 1. Engine block; 2. Turbocharger; 3. Aftertreatment system; 4. Air filter; 5. Intercooler; 6. Radiator; 7. Throttle valve; 8. EGR valve; 9. Cooler; 10. Voltage regulator box; 11. Resonance tube; 12. Resonance chamber; 13. Venturi tube. Detailed Implementation

[0018] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0019] In the description of this application, it should be understood that if 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" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening 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 intervening element. If so, 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 possible implementation.

[0024] Figure 1 This is a schematic diagram of the resonant-driven EGR system provided in an embodiment of this application, shown in a usage scenario. (See also...) Figure 1 The resonant drive EGR system provided in one embodiment of this application is applied to an engine assembly. The engine assembly includes an engine body 1 and an air supply device. The engine body 1 is provided with an air intake and an exhaust port. In this embodiment, the air supply device can supply air to the air intake of the engine body 1, thereby increasing the engine intake pressure and improving the output power and efficiency of the engine body 1.

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

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

[0027] The function of the resonant tube 11 is to adjust the vibration frequency. Through the design of the gas flow path, the resonant tube 11 enables the gas to generate fluctuations at a specific frequency as it passes through, thus preparing for the subsequent resonance process. The resonant tube 11 is typically based on acoustic principles, adjusting the resonant frequency by changing the length or diameter of the tube to adapt to the needs of different engine speeds. The length and diameter of the resonant tube 11 can be determined through calculation and testing to ensure that, under specific operating conditions, the gas flow can generate fluctuations at a specific frequency. In this embodiment, the specific dimensions and shape of the resonant tube 11 are not specifically limited.

[0028] The resonant chamber 12 forms a closed cavity, the volume and size of which can be determined according to the required EGR rate of the engine. When the exhaust gas passes through the resonant tube 11, a pressure wave is formed in the resonant chamber 12. The pressure wave can be reflected and superimposed within the resonant chamber 12. By optimizing the structural dimensions of the resonant chamber 12, the fluctuations generated during gas flow can be enhanced, causing the gas to resonate at a specific frequency, thereby amplifying the pressure wave of the EGR gas and improving the EGR rate. In this embodiment, the specific dimensions and shape of the resonant chamber 12 are not specifically limited.

[0029] The Venturi tube 13 has a power air inlet, an intake inlet, and an outlet. The power air inlet is connected to the outlet of the air supply device, the intake inlet is connected to the outlet of the resonant chamber 12, and the outlet is connected to the intake inlet. The Venturi tube 13 plays a crucial role in the resonant-driven EGR (exhaust gas recirculation) system of the natural gas engine. Air supplied by the air supply device enters the Venturi tube 13 through the power air inlet, and exhaust gas flowing out of the resonant chamber 12 enters the Venturi tube 13 through the intake inlet. The Venturi tube 13 utilizes the pressure drop on the wall 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 the EGR (exhaust gas) and the air, thereby further improving the EGR rate. Specifically, when the air supplied by the air supply device passes through the Venturi tube 13, a low-pressure zone is formed at the throat. This low-pressure zone helps to attract more exhaust gas to mix with the air, thereby increasing the inflow of exhaust gas and thus 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 range, thereby improving engine combustion efficiency and reducing emissions.

[0030] In some embodiments of this application, the resonant drive EGR system further includes a voltage regulator box 10, which is connected between the resonant tube 11 and the exhaust port.

[0031] In the direction of exhaust gas flow, the pressure regulator 10 is located upstream of the resonant tube 11, and its function is to regulate and control the exhaust pulse. The pressure regulator 10 has a relatively large space to hold a certain amount of gas, thereby buffering the pressure fluctuations generated by the resonant system, preventing these fluctuations from interfering with the normal exhaust process of the engine, and also ensuring the stable operation of the EGR system.

[0032] In some embodiments of this application, the resonant drive EGR system further includes a cooler 9 and a cooling pipe. 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 voltage regulator box 10. The cooling pipe is connected to the second heat exchange side.

[0033] The exhaust gas from the exhaust port first enters the cooler 9 through the inlet on the first heat exchange side. Here, 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. After being cooled, the exhaust gas flows out from the outlet on the first heat exchange side and then enters the pressure stabilizing tank 10.

[0034] The cooling pipes are connected to the second heat exchange side of the cooler 9. The cooling medium (such as coolant) reaches the second heat exchange side of the cooler 9 through the cooling pipes, where it continues to exchange heat with the exhaust gas. After completing the heat exchange, the cooling medium returns to the cooling system through the cooling pipes for continued recycling.

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

[0036] The coolant in the engine block 1 enters the cooling pipes through the coolant outlet and reaches the second heat exchange side of the cooler 9 through the cooling pipes. Here, the coolant exchanges heat with the exhaust gas, absorbing heat from the exhaust gas. Subsequently, the cooled coolant enters the cooling cycle of the engine block 1 through the cooling pipes to cool down, and then circulates back to the coolant inlet, thus repeating the cycle. In this embodiment, the cooler 9 is connected to the cooling cycle of the engine block 1 through the cooling pipes, allowing the cooler 9 to utilize the engine's own coolant circulation system to cool the exhaust gas. This not only simplifies the system's complexity and reduces costs, but also avoids the problems of increased weight, energy consumption, and maintenance complexity caused by introducing an additional cooling cycle. In addition, the exhaust gas is effectively cooled before entering components such as the voltage regulator 10, the resonant tube 11, and the resonant chamber 12, which improves the system's efficiency and reliability.

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

[0038] The above configuration allows the cooling system to operate in a closed loop, ensuring that the coolant circulates between the engine block 1, cooler 9, and radiator 6 without requiring additional cooling circulation power structures or heat dissipation structures. This effectively transfers heat from the exhaust gas, ensuring that the exhaust gas is cooled to a suitable temperature before entering the engine cylinders, thereby improving EGR efficiency and reliability. Simultaneously, this integrated cooling solution simplifies system complexity, reduces costs, and improves overall system efficiency.

[0039] In some embodiments, the resonant drive EGR system further includes a throttle valve 7 and an intercooler 5. 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 air inlet through the throttle valve 7.

[0040] The primary function of the intercooler 5 is to cool the air before it enters the engine. Before entering the intercooler 5, the air undergoes preliminary treatment by the air supply system, and then the intercooler 5 cools the air, lowering its temperature and increasing its density, thus providing the engine with a higher quality air-fuel mixture. The throttle valve 7 is located after the outlet of the intercooler 5, and its main function is to control the amount of air entering the engine. The driver controls the opening of the throttle valve 7 via the accelerator pedal. This configuration ensures that the air entering the engine has a lower temperature and higher density, which is beneficial for improving engine combustion efficiency and also provides better conditions for the effective operation of the EGR system.

[0041] In some embodiments, the resonant drive EGR system further includes an EGR valve 8, and the outlet of the resonant chamber 12 is connected to the inlet via the EGR valve 8.

[0042] EGR valve 8 is located downstream of resonant chamber 12 and its function is to control the EGR rate. When exhaust gas, after passing through resonant chamber 12 and amplifying the resonant wave, passes through EGR valve 8, EGR valve 8 adjusts its opening according to preset parameters (such as engine speed, load, etc.), thereby controlling the amount of exhaust gas entering engine body 1. By precisely controlling the amount of exhaust gas introduced, the air-fuel mixture composition of engine body 1 can be optimized to be closer to the stoichiometric air-fuel ratio, thereby improving combustion efficiency and reducing nitrogen oxide (NOx) emissions.

[0043] Furthermore, the EGR valve 8 also protects the engine block 1, preventing excessive exhaust gas from entering and causing performance degradation or malfunctions. Therefore, the EGR valve 8 ensures effective engine operation under various conditions while also guaranteeing the system's safety and reliability.

[0044] In this embodiment, the EGR valve 8 can be a butterfly valve, a ball valve, or a solenoid valve, etc., and no specific limitation is made here.

[0045] In some embodiments, the air supply device includes a booster 2, the vortex end of the booster 2 being connected to the exhaust port, and the pressure end of the booster 2 being connected to the power air inlet.

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

[0047] Therefore, the turbocharger 2 can utilize the energy of the exhaust gas to drive the pressure end, thereby increasing the air density entering the venturi tube 13, and further increasing the air density entering the engine body 1, thus improving the engine's output power and efficiency. Specifically, the engine body 1 can utilize the exhaust gas energy that would otherwise be wasted to increase the intake pressure, thereby improving combustion efficiency and engine performance. When air passes through the venturi tube 13, due to the Venturi effect (i.e., fluid speed increases and pressure decreases when passing through a narrow channel), a low-pressure zone is generated at the throat of the venturi tube 13, thereby attracting more exhaust gas to mix with the air. This not only increases the intake air density but also enhances the mixing effect of 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, which is connected to the inlet of the air supply device.

[0049] In this embodiment, the type of air filter 4 is not specifically limited, and is determined based on the specific usage environment, cost considerations, and required filtration performance. For example, paper filters or foam filters can be used in vehicles traveling on urban roads, while cyclone filters or oil bath filters can be used in industrial environments.

[0050] Air filter 4 can be connected to turbocharger 2 via a rubber connector or a dedicated connecting pipe to ensure smooth airflow and a good seal. Air filter 4 is installed at the inlet of the air supply device, and its function is to remove dust, sand, and other impurities that may be present in the air. Air filter 4 can capture tiny particles in the air, preventing these impurities from entering the engine and causing wear or other damage.

[0051] Optionally, the resonant drive EGR system provided in one embodiment of this application further includes an after-processor 3, which is connected to the vortex end outlet of the turbocharger 2. The function of the after-processor 3 is to reduce the content of harmful substances in engine emissions through chemical reactions or physical methods. The after-processor 3 may be a three-way catalytic converter (TWC), capable of treating pollutants such as CO (carbon monoxide), HC (hydrocarbons), and NOx (nitrogen oxides) in exhaust gas, converting them into substances less harmful to human health and the environment, such as carbon dioxide, water, and nitrogen.

[0052] The connection between the aftertreatment system 3 and the turbocharger 2's turbine outlet not only utilizes the energy of the exhaust gas to improve intake efficiency but also purifies the exhaust gas before it is emitted, reducing its environmental impact. This helps improve engine efficiency while meeting stringent emission standards.

[0053] This application embodiment also provides an engine assembly including the aforementioned resonant drive EGR system. Because the engine assembly of this embodiment employs the aforementioned resonant drive EGR system, it can effectively improve the EGR rate of the engine body 1 in the low-speed, high-load region, improve combustion stability, reduce nitrogen oxide (NOx) emissions, and improve overall efficiency.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A resonant-driven EGR system, characterized in that, Applied to an engine assembly, the engine assembly including an engine body and an air supply device, the engine body being provided with an air intake port and an exhaust port, the resonant drive EGR system including: Resonance chamber; A resonant tube connects the inlet of the resonant chamber and the exhaust port; The venturi tube has a power gas inlet, an intake port, and an outlet. The power gas inlet is connected to the outlet of the gas supply device, the intake port is connected to the outlet of the resonant chamber, and the outlet is connected to the intake port. Also includes: A voltage regulator box is connected between the resonant tube and the exhaust port; The resonant-driven EGR system also includes: The cooler 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 box. Cooling pipes, which are connected to the second heat exchange side; The engine body is also provided with a coolant inlet and a coolant outlet. The cooling pipe connects the coolant inlet and the coolant outlet.

2. The resonant drive EGR system according to claim 1, characterized in that, The engine assembly also includes: The radiator has its inlet connected to the outlet of the second heat exchange side via the cooling pipe, and its outlet connected to the coolant inlet via the cooling pipe.

3. The resonant drive EGR system according to claim 1 or 2, characterized in that, Also includes: Throttle body; An intercooler, the inlet of which is connected to the outlet of the air supply device, and the outlet of the intercooler connected to the power air inlet through the throttle valve.

4. The resonant drive EGR system according to claim 1, characterized in that, Also includes: The outlet of the resonant chamber is connected to the inlet via the EGR valve.

5. The resonant drive EGR system according to claim 1 or 2, characterized in that, The gas supply device includes: A turbocharger, wherein the turbocharger's vortex end is connected to the exhaust port, and the turbocharger's pressure end is connected to the power gas inlet.

6. The resonant drive EGR system according to claim 5, characterized in that, The gas supply device also includes: An air filter is connected to the inlet of the air supply device.

7. An engine assembly, characterized in that, Including the resonant drive EGR system as described in any one of claims 1 to 6.

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