High-concentration and high-stability premixed fuel preparation and supply system and control method

Abstract

The present invention is applicable to the field of engine fuel pretreatment technology and provides a high-concentration, high-stability premixed fuel preparation and supply system and control method. The system includes a fuel tank, a fuel filter, a three-way valve, a gas filter, a high-pressure gas source, a constant-pressure oil pump, a high-pressure oil pump, a boost air pump, an engine combustion chamber, a fuel rail pressure sensor, a high-pressure fuel rail, a fuel injector, an electronic control unit, a two-way three-way valve, a one-way electromagnetic pressure reducing valve, a two-way electromagnetic pressure reducing valve, and a one-way electromagnetic valve, as well as a high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank and a high-pressure environment porous membrane tube-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank. The present invention prepares bulk micro-nanoscale bubbly flow premixed fuel under high-pressure conditions, wherein the micro-nanoscale bubble particle size is more concentrated and the stability is greatly improved, thereby achieving premixing of fuel and air and effectively improving the concentration and stability of micro-nanobubbles.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine fuel pretreatment, and in particular relates to a high-concentration and high-stability premixed fuel preparation and supply system and a control method. Background Art

[0002] Since the beginning of the 21st century, with the development of disciplines such as interfaces and nanoscience, nanoscale bubbly flows have attracted increasing attention and applications in diverse fields. Bulk micro- and nanoscale bubbly flow fuels are hydrocarbon fuels that contain countless bubbles of gas, each less than 1 μm in diameter, and are stably suspended. Bulk micro- and nanoscale bubbly flow fuels possess properties such as high surface area relative to gas phase, high discrete gas phase stability, self-pressurizing solubility, high gas phase solubility rate, and hydroxyl radical excitation. These fuels can modify fuels while transcending the single atomization and mixing method of oil and gas within the combustion chamber, thereby improving thermal efficiency and reducing pollutant emissions.

[0003] Because a large number of bulk micro- and nano-scale bubbles exist in the premixed fuel, they precipitate and implode due to pressure transients after the fuel is injected into the cylinder, creating a micro-explosion effect. This increases the fuel spray cone angle, reduces the spray penetration distance, and increases the radial length of the spray jet midsection, evenly distributing the fuel and gas within the cylinder. This effectively improves the uniformity of the mixture, thereby increasing the engine's thermal efficiency and reducing incomplete combustion emissions. However, the preparation and delivery systems for bulk micro- and nano-scale bubbly premixed fuels are still under laboratory bench testing and present challenges such as low and uneven bubble concentration in the premixed fuel, a wide and uncontrollable bubble size range, low bubble preparation efficiency, and an unstable delivery system. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-concentration and high-stability premixed fuel preparation and supply system and control method, aiming to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] High-concentration and high-stability premixed fuel preparation and supply system, including:

[0007] Fuel tank, fuel filter, three-way valve 1, gas filter, high-pressure gas source, constant boost oil pump, high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank, high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank, high-pressure fuel pump, boost air pump, engine combustion chamber, fuel rail pressure sensor, high-pressure fuel rail, injector, electronic control unit, three-way valve 2, one-way solenoid pressure reducing valve 1, one-way solenoid pressure reducing valve 2 and one-way solenoid valve. First, after filtering and reducing the gas pressure, it is sent into the high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank for preliminary preparation of bubbly flow fuel. Secondly, it is sent to the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank for further preparation to increase the micro-nano bubble gas phase density. The high-pressure fuel pump delivers the premixed fuel to the high-pressure fuel rail. Finally, the injector sprays the fuel into the engine combustion chamber according to the signal of the electronic control unit to mix with air for combustion.

[0008] Furthermore, the high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank includes a fixing bolt, an air intake pipe, an oil inlet, a Venturi-type micro-nano bubble generator, a pressure sensor, a liquid level sensor, an air inlet, an air inlet 2 and an oil outlet; the oil inlet 1 is connected to the oil outlet of the constant boost oil pump; the air inlet 1 is connected to the gas filter outlet; the air inlet 2 is connected to the boost air pump outlet.

[0009] Furthermore, the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank includes two fixing bolts, two air intake pipes, an air intake pressure gauge, a micro-nanoscale porous membrane tube, a filter membrane, two oil inlets, two pressure sensors, two liquid level sensors, an air bleed port and two oil outlets; the second air intake pipe is connected to the air outlet of the gas filter; the second oil inlet is connected to the first oil outlet; the air bleed port is connected to the inlet of the boost air pump; the second oil outlet is connected to the inlet of the high-pressure oil pump.

[0010] Furthermore, in terms of oil circuit connections, the fuel tank outlet is connected to the fuel filter inlet; the fuel filter outlet is connected to the inlet of the three-way valve; the outlet of the three-way valve is connected to the inlet of the constant boost oil pump; the outlet of the constant boost oil pump is connected to the first oil inlet; the first oil outlet is connected to the second oil inlet; the second oil outlet is connected to the inlet of the high-pressure oil pump; the outlet of the high-pressure oil pump is connected to the inlet valve of the high-pressure oil rail; the outlet of the high-pressure oil rail is connected to the inlet of the injector, and the oil drain port of the high-pressure oil rail is connected to the second inlet of the three-way valve through a one-way electromagnetic pressure limiting valve; the oil return port of the injector is connected to the second inlet of the three-way valve; the second outlet of the three-way valve is connected to the inlet of the three-way valve; the injector is connected to the combustion chamber of the engine;

[0011] In terms of gas circuit connection, the high-pressure gas source outlet is connected to the gas filter inlet; the gas filter outlet is connected to the first air inlet through the first one-way electromagnetic pressure reducing valve, and the gas filter outlet is connected to the second air inlet pipe of the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank through the second one-way electromagnetic pressure reducing valve; the air outlet of the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank is connected to the air inlet of the booster air pump; the air outlet of the booster air pump is connected to the second air inlet;

[0012] In terms of signal connection, the input end of the electronic control unit is respectively connected to pressure sensor 1, liquid level sensor 1, pressure sensor 2 and liquid level sensor 2, and the output end of the electronic control unit is respectively connected to the air compressor, constant boost oil pump, high-pressure oil pump, injector, one-way electromagnetic pressure limiting valve, one-way electromagnetic pressure reducing valve 1, one-way electromagnetic pressure reducing valve 2 and one-way solenoid valve.

[0013] Furthermore, the three-way valve 1 has two inlets and one outlet, the inlet 1 is connected to the fuel filter outlet, the inlet 2 is connected to the three-way valve 2 outlet, and the outlet is connected to the constant boost oil pump inlet.

[0014] Furthermore, the three-way valve 2 has two inlets and one outlet. The inlet 1 is connected to the oil return port of the injector, the inlet 2 is connected to the high-pressure oil rail pressure relief port through a one-way electromagnetic pressure limiting valve, and the outlet is connected to the inlet 2 of the three-way valve 1.

[0015] Furthermore, the high-pressure oil rail has an oil inlet, an oil outlet and an oil drain port, the oil inlet is connected to the oil outlet of the high-pressure oil pump, the oil outlet is connected to the injector inlet, and the oil drain port is connected to the second inlet of the three-way valve through a one-way electromagnetic pressure limiting valve.

[0016] Furthermore, the one-way electromagnetic pressure reducing valve 1, the one-way electromagnetic pressure reducing valve 2, the one-way electromagnetic valve and the one-way electromagnetic pressure limiting valve remain in a normally closed state and are opened only when receiving a signal from the electronic control unit.

[0017] A control method for a high-concentration, high-stability premixed fuel preparation and supply system includes the following steps:

[0018] Step 1: The electronic control unit is initialized after receiving the power supply signal;

[0019] Step 2: Liquid level sensor 1 detects the liquid level in the tank; if the liquid level is below the lower limit, the constant pressure boost pump receives the signal to start working, and the one-way solenoid pressure reducing valve 1 receives the signal to open; if the liquid level is above the upper limit, the one-way solenoid pressure reducing valve 1 and the constant pressure boost pump are kept closed;

[0020] Step 3: Pressure sensor 1 detects the pressure inside the tank; if the pressure is lower than the lower limit, the one-way electromagnetic pressure reducing valve 1 receives the signal and opens;

[0021] Step 4: Liquid level sensor 2 detects the liquid level in the tank; if the liquid level is lower than the lower limit, the one-way solenoid pressure reducing valve 2 and the one-way solenoid valve receive the signal to open; if the liquid level is higher than the upper limit, the one-way solenoid pressure reducing valve 2 and the one-way solenoid valve receive the signal to close;

[0022] Step 5: Pressure sensor 2 detects the pressure in the tank; if the pressure is higher than the upper limit, the one-way solenoid pressure reducing valve 1, the one-way solenoid pressure reducing valve 2 and the one-way solenoid valve receive the signal to close, and the booster pump receives the signal to start working;

[0023] Step 6: The rail pressure sensor determines the pressure of the micro-nanoscale bubbly flow premixed fuel in the high-pressure rail. If the current rail pressure is less than the preset rail pressure, the opening of the high-pressure rail inlet valve is increased. If the current rail pressure is greater than the preset rail pressure, the high-pressure rail drain port is opened, and the fuel flows into the three-way valve 2 through the one-way electromagnetic pressure limiting valve.

[0024] Step 7: The high-pressure fuel rail supplies fuel to the injector;

[0025] Step 8: The fuel is sprayed into the engine combustion chamber through the injector, and the uninjected fuel flows into the three-way valve 2 through the injector return port;

[0026] Step 9: Repeat steps 2 to 8 above;

[0027] Step 10: Upon receiving a stop signal from the electronic control unit, the high-concentration and high-stability premixed fuel preparation and supply system stops working.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The high-concentration and high-stability premixed fuel preparation and supply system and control method first pass pressurized fuel into a venturi-type micro-nano bubble generator to inhale gas under high-pressure environment to prepare bubbly flow premixed fuel. Secondly, the premixed fuel is sent to a preparation tank of a porous membrane tubular micro-nano bubble generator under high-pressure environment for secondary preparation. Based on the two micro-nano bubble generating units, bulk micro-nanoscale bubbly flow premixed fuel is prepared under high-pressure environment. The micro-nanoscale bubble particle size is more concentrated and the stability is greatly improved, thereby realizing the premixing of fuel and air and effectively improving the concentration and stability of micro-nano bubbles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 This is a logic block diagram of the method of the present invention.

[0032] Figure 3This is a schematic structural diagram of a Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank in a medium- and high-pressure environment of the present invention.

[0033] Figure 4 This is a schematic structural diagram of the porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank in a medium- and high-pressure environment of the present invention.

[0034] Figure 5 Schematic diagram of the structure of the Wenqiuli type micro-nano bubble generator in the present invention.

[0035] In the figure: fuel tank 1, fuel filter 2, three-way valve 3, gas filter 4, high-pressure gas source 5, constant boost oil pump 6, high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank 7, high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8, high-pressure fuel pump 9, boost air pump 10, engine combustion chamber 11, fuel rail pressure sensor 12, high-pressure fuel rail 13, injector 14, electronic control unit 15, three-way valve 2 16, fixing bolt 301, intake pipe 302, fuel inlet 303 03. Venturi-type micro-nano bubble generator 304, pressure sensor 1 305, liquid level sensor 1 306, air inlet 1 307, air inlet 2 308, oil outlet 1 309, fixing bolt 2 401, air selection tube 2 402, air inlet pressure gauge 403, micro-nanoscale porous membrane tube 404, filter membrane 405, oil inlet 2 406, pressure sensor 2 407, liquid level sensor 2 408, air vent 409, oil outlet 2 410, oil inlet 3 501, air inlet 3 502, oil outlet 3 503. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0038] like Figure 1-5 As shown, a high-concentration and high-stability premixed fuel preparation and supply system provided by one embodiment of the present invention includes:

[0039] Fuel tank 1, fuel filter 2, three-way valve 1 3, gas filter 4, high-pressure gas source 5, constant boost fuel pump 6, high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank 7, high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8, high-pressure fuel pump 9, boost air pump 10, engine combustion chamber 11, fuel rail pressure sensor 12, high-pressure fuel rail 13, injector 14, electronic control unit 15, three-way valve 2 16, one-way electromagnetic pressure reducing valve 1, one-way electromagnetic pressure reducing valve 2 and a one-way solenoid valve. First, the gas is filtered and decompressed before being sent into a high-pressure Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank 7 to initially prepare the bubbly flow fuel. Secondly, it is sent into a high-pressure porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8 for further preparation to increase the gas phase density of the micro-nano bubbles. The high-pressure oil pump 9 delivers the premixed fuel to the high-pressure oil rail 13. Finally, the injector 14 sprays the fuel into the engine combustion chamber according to the signal of the electronic control unit 15 to mix with the air for combustion.

[0040] In an embodiment of the present invention, preferably, the electronic control unit 15 controls the actuator to complete the rail pressure control of the fuel supply system, the changes in different time effects, the switching of different gas phase densities and different bubble concentrations. The present invention is divided into two parts. The first part is a bulk micro-nanoscale bubbly flow premixed fuel preparation system, which uses a two-stage mixed fuel preparation method to ensure that the fuel supplied to the engine for combustion has a sufficiently large micro-nano bubble gas phase density; the second part is a supply system proposed for the two-stage premixed fuel preparation system, so that the preparation system can meet the high pressure, safety and stable environment while quickly supplying the premixed fuel to the combustion chamber for combustion. The fuel tank 1 uses, but is not limited to, gasoline, diesel, biodiesel, coal-to-liquids and other combustible hydrocarbon fuels as liquid phase carriers to prepare bulk micro-nanoscale bubbly flow premixed fuel. The high-pressure gas source 5 uses compressed storage gases such as oxygen and hydrogen in addition to air to prepare bulk micro-nanoscale bubbly flow premixed fuel.

[0041] like Figure 1 and Figure 3 As shown, as a preferred embodiment of the present invention, the high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank 7 includes a fixing bolt 301, an air intake pipe 302, an oil inlet 303, a Venturi-type micro-nano bubble generator 304, a pressure sensor 305, a liquid level sensor 306, an air inlet 307, an air inlet 2 308 and an oil outlet 309; the oil inlet 1 303 is connected to the oil outlet of the constant boost oil pump 6; the air inlet 1 307 is connected to the outlet of the gas filter 4; the air inlet 2 308 is connected to the outlet of the boost air pump 10.

[0042] In this embodiment of the present invention, the Venturi-type micro-nano bubble generator 304 preferably includes an oil inlet 3 501, an air inlet 3 502, and an oil outlet 3 503. A pressure sensor 1 305 measures the pressure within the storage tank and transmits the signal to the electronic control unit 15 for processing to maintain the tank pressure and prevent the release of micro-nano bubbles within the premixed fuel due to pressure fluctuations. A liquid level sensor 1 306 measures the liquid level and transmits the signal to the electronic control unit for processing to ensure the supply of bulk micro-nano bubbly fuel during engine operation.

[0043] like Figure 1 and Figure 4 As shown, as a preferred embodiment of the present invention, the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8 includes a fixing bolt 2 401, an air intake pipe 2 402, an air intake pressure gauge 403, a micro-nanoscale porous membrane tube 404, a filter membrane 405, an oil inlet 2 406, a pressure sensor 2 407, a liquid level sensor 2 408, an air bleed port 409 and an oil outlet 2 410; the air intake pipe 2 402 is connected to the air outlet of the gas filter 4; the oil inlet 2 406 is connected to the oil outlet 1 309; the air bleed port 409 is connected to the inlet of the boost air pump 10; the oil outlet 2 410 is connected to the inlet of the high-pressure oil pump 9.

[0044] In this embodiment of the present invention, pressure sensor 2 407 preferably measures the pressure within the storage tank and transmits the signal to the electronic control unit 15 for processing, maintaining the tank pressure and preventing the release of micro- and nano-scale bubbles within the premixed fuel due to pressure changes. Liquid level sensor 2 408 measures the liquid level and transmits the signal to the electronic control unit 15 for processing, ensuring the supply of bulk micro- and nano-scale bubbly fuel during engine operation. Micron-scale filter membrane 405 removes micron-sized bubbles from the fuel and prevents them from mixing into the fuel supply and participating in engine combustion.

[0045] like Figure 1-4 As shown, as a preferred embodiment of the present invention:

[0046] In terms of oil circuit connection, the outlet of the fuel tank 1 is connected to the inlet of the fuel filter 2; the outlet of the fuel filter 2 is connected to the inlet of the three-way valve 3; the outlet of the three-way valve 3 is connected to the inlet of the constant boost oil pump 6; the outlet of the constant boost oil pump 6 is connected to the oil inlet 303; the oil outlet 309 is connected to the oil inlet 406; the oil outlet 410 is connected to the inlet of the high-pressure oil pump 9; the outlet of the high-pressure oil pump 9 is connected to the inlet valve of the high-pressure oil rail 13; the outlet of the high-pressure oil rail 13 is connected to the inlet of the injector 14, and the oil drain port of the high-pressure oil rail 13 is connected to the inlet of the three-way valve 2 16 through a one-way electromagnetic pressure limiting valve; the oil return port of the injector 14 is connected to the inlet of the three-way valve 2 16; the outlet of the three-way valve 2 16 is connected to the inlet of the three-way valve 3; the injector 14 is connected to the engine combustion chamber 11;

[0047] In terms of gas circuit connection, the outlet of the high-pressure gas source 5 is connected to the inlet of the gas filter 4; the outlet of the gas filter 4 is connected to the air inlet 1 307 through a one-way electromagnetic pressure reducing valve 1, and the outlet of the gas filter 4 is connected to the air inlet 2 402 of the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8 through a one-way electromagnetic pressure reducing valve 2; the air outlet of the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8 is connected to the air inlet of the booster air pump 10; the air outlet of the booster air pump 10 is connected to the air inlet 2 308;

[0048] In terms of signal connection, the input end of the electronic control unit 15 is respectively connected to the pressure sensor 1 305, the liquid level sensor 1 306, the pressure sensor 2 407 and the liquid level sensor 2 408, and the output end of the electronic control unit 15 is respectively connected to the air compressor 4, the constant boost oil pump 6, the high-pressure oil pump 13, the injector 14, the one-way electromagnetic pressure limiting valve, the one-way electromagnetic pressure reducing valve 1, the one-way electromagnetic pressure reducing valve 2 and the one-way solenoid valve.

[0049] In an embodiment of the present invention, preferably, the fuel injector 14 sprays fuel into the engine combustion chamber 11 to participate in combustion. The outlet of the fuel tank 1 is connected to the inlet of the fuel filter 2 to realize the supply of fuel and the filtration of fuel impurities, thereby preventing the fuel supply system from being blocked. The outlet of the high-pressure gas source 5 is connected to the inlet of the gas filter 4 to realize the filtration of gas impurities and prevent the gas supply system from being mixed with foreign matter. The outlet of the gas filter 4 is connected to the air inlet 1 307 through a one-way electromagnetic pressure reducing valve 1 to ensure the constant pressure in the tank and the requirements for premixed fuel preparation. The air outlet of the booster air pump 10 is connected to the air inlet 2 308 to realize that when the pressure in the high-pressure environment porous membrane tubular bulk micro-nanoscale bubble flow premixed fuel preparation tank 8 exceeds the preset value, the pressure is boosted and sent to the high-pressure environment Venturi-type bulk micro-nanoscale bubble flow premixed fuel preparation tank 7. The outlet of gas filter 4 is connected to intake pipe 2 402 of high-pressure porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8 via one-way solenoid pressure reducing valve 2, supplying the required premixed fuel. The outlet of high-pressure porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8 is connected to the inlet of booster air pump 10. This allows atomized fuel gas to be promptly delivered to high-pressure porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 7 when the pressure in high-pressure porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8 exceeds a preset value. The electronic control unit 15 provides a pressure control signal to the high-pressure fuel rail 13. Simultaneously, the fuel rail pressure sensor 12 sends a signal to the electronic control unit 15, which in turn provides a signal to the one-way solenoid pressure limiting valve, thereby maintaining the high-pressure fuel rail pressure.

[0050] like Figure 1 As shown, as a preferred embodiment of the present invention, the three-way valve 1 3 has two inlets and one outlet, the inlet 1 is connected to the outlet of the fuel filter 2, the inlet 2 is connected to the outlet of the three-way valve 2 16, and the outlet is connected to the inlet of the constant boost oil pump 6.

[0051] like Figure 1 As shown, as a preferred embodiment of the present invention, the three-way valve 2 16 has two inlets and one outlet, the inlet 1 is connected to the oil return port of the injector 14, the inlet 2 is connected to the pressure relief port of the high-pressure oil rail 13 through a one-way electromagnetic pressure limiting valve, and the outlet is connected to the inlet 2 of the three-way valve 1 3.

[0052] like Figure 1 As shown, as a preferred embodiment of the present invention, the high-pressure oil rail 13 has an oil inlet, an oil outlet and an oil drain port, the oil inlet is connected to the oil outlet of the high-pressure oil pump 9, the oil outlet is connected to the inlet of the injector 14, and the oil drain port is connected to the inlet 2 of the three-way valve 16 through a one-way electromagnetic pressure limiting valve.

[0053] like Figure 1As shown, as a preferred embodiment of the present invention, the one-way electromagnetic pressure reducing valve 1, the one-way electromagnetic pressure reducing valve 2, the one-way electromagnetic valve and the one-way electromagnetic pressure limiting valve remain in a normally closed state and are opened only when receiving the electronic control unit signal 15.

[0054] like Figure 2 As shown, a control method for a high-concentration and high-stability premixed fuel preparation and supply system provided by one embodiment of the present invention includes the following steps:

[0055] Step 1: The electronic control unit 15 is initialized after receiving the power supply signal;

[0056] Step 2: Liquid level sensor 1 306 detects the liquid level in the tank; if the liquid level is below the lower limit, the constant pressure boost pump 6 receives the signal to start working, and the one-way electromagnetic pressure reducing valve 1 receives the signal to open; if the liquid level is above the upper limit, the one-way electromagnetic pressure reducing valve 1 and the constant pressure boost pump 6 are kept closed;

[0057] Step 3: The pressure sensor 305 detects the pressure inside the tank; if the pressure is lower than the lower limit, the one-way electromagnetic pressure reducing valve 1 receives the signal and opens;

[0058] Step 4: The second liquid level sensor 408 detects the liquid level in the tank; if the liquid level is below the lower limit, the second one-way solenoid pressure reducing valve and the one-way solenoid valve receive the signal to open; if the liquid level is above the upper limit, the second one-way solenoid pressure reducing valve and the one-way solenoid valve receive the signal to close;

[0059] Step 5: The second pressure sensor 407 detects the pressure in the tank; if the pressure is higher than the upper limit, the one-way electromagnetic pressure reducing valve 1, the one-way electromagnetic pressure reducing valve 2 and the one-way electromagnetic valve receive the signal to close, and the booster pump 10 receives the signal to start working;

[0060] Step 6: The rail pressure sensor 12 determines the pressure of the micro-nanoscale bubbly flow premixed fuel in the high-pressure rail 13. If the current rail pressure is less than the preset rail pressure, the opening of the inlet valve of the high-pressure rail 13 is increased. If the current rail pressure is greater than the preset rail pressure, the drain port of the high-pressure rail 13 is opened, and the fuel flows into the three-way valve 16 through the one-way electromagnetic pressure limiting valve.

[0061] Step 7: The high-pressure fuel rail 13 supplies fuel to the fuel injector 14;

[0062] Step 8: The fuel is sprayed into the engine combustion chamber 11 through the injector 14, and the uninjected fuel flows into the three-way valve 2 16 through the oil return port of the injector 14;

[0063] Step 9: Repeat steps 2 to 8 above;

[0064] Step 10: Upon receiving a stop signal from the electronic control unit 15 , the high-concentration and high-stability premixed fuel preparation and supply system stops working.

[0065] The working principle of the present invention is:

[0066] When the engine is started, the electronic control unit 15 gives a start signal to the constant boost oil pump 6. The fuel in the fuel tank 1 is filtered by the fuel filter 2 and pumped by the three-way valve 3 to the oil inlet of the high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank 7. At the same time, the gas in the high-pressure gas source 5 is filtered by the gas filter 4 and decompressed by the one-way solenoid valve 1 and then sent to the high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank 7; the preliminarily prepared premixed fuel is transported to the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank 8 through the one-way solenoid valve. At the same time, the gas in the high-pressure gas source 5 is filtered by the gas filter 4 and decompressed by the one-way solenoid valve 2 and then sent to the intake pipe 2 402, and undergoes secondary preparation in the preparation tank to increase the micro-nano bubble gas phase density. When fuel supply starts, the bulk micro-nanoscale bubbly flow fuel is delivered to the high-pressure fuel rail 13 through the high-pressure fuel pump 9 to establish the rail pressure. The injection signal is issued and the fuel is injected into the engine combustion chamber 11 through the injector 14 to mix with the air and participate in combustion. The uninjected fuel flows back to the controllable three-way valve 2 16 through the return port.

[0067] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention. These should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. High-concentration and high-stability premixed fuel preparation and supply system, characterized by: include: Fuel tank, fuel filter, three-way valve 1, gas filter, high-pressure gas source, constant boost oil pump, high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank, high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank, high-pressure fuel pump, boost air pump, engine combustion chamber, fuel rail pressure sensor, high-pressure fuel rail, injector, electronic control unit, three-way valve 2, one-way solenoid pressure reducing valve 1, one-way solenoid pressure reducing valve 2 and one-way solenoid valve. First, after filtering and reducing the gas pressure, it is sent into the high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank for preliminary preparation of bubbly flow fuel. Secondly, it is sent to the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank for further preparation to increase the micro-nano bubble gas phase density. The high-pressure fuel pump delivers the premixed fuel to the high-pressure fuel rail. Finally, the injector sprays the fuel into the engine combustion chamber according to the signal of the electronic control unit to mix with air for combustion. The high-pressure environment Venturi-type bulk micro-nanoscale bubbly flow premixed fuel preparation tank includes a fixing bolt, an air inlet pipe, an oil inlet, a Venturi-type micro-nano bubble generator, a pressure sensor, a liquid level sensor, an air inlet, an air inlet, an air inlet, an oil outlet, an oil outlet; the oil inlet is connected to the oil outlet of the constant boost oil pump; the air inlet is connected to the outlet of the gas filter; the air inlet is connected to the outlet of the boost air pump; The high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank includes two fixing bolts, two air inlet pipes, an air inlet pressure gauge, a micro-nanoscale porous membrane tube, a filter membrane, two oil inlets, two pressure sensors, two liquid level sensors, an air bleed port and two oil outlets; the second air inlet pipe is connected to the air outlet of the gas filter; the second oil inlet is connected to the first oil outlet; the air bleed port is connected to the inlet of the booster air pump; the second oil outlet is connected to the inlet of the high-pressure oil pump; In terms of oil circuit connections, the fuel tank outlet is connected to the fuel filter inlet; the fuel filter outlet is connected to the inlet of the three-way valve; the outlet of the three-way valve is connected to the inlet of the constant boost oil pump; the outlet of the constant boost oil pump is connected to the first oil inlet; the first oil outlet is connected to the second oil inlet; the second oil outlet is connected to the inlet of the high-pressure oil pump; the outlet of the high-pressure oil pump is connected to the inlet valve of the high-pressure oil rail; the outlet of the high-pressure oil rail is connected to the inlet of the fuel injector, and the oil drain port of the high-pressure fuel rail is connected to the second inlet of the three-way valve through a one-way electromagnetic pressure limiting valve; the oil return port of the fuel injector is connected to the second inlet of the three-way valve; the second outlet of the three-way valve is connected to the inlet of the three-way valve; the fuel injector is connected to the combustion chamber of the engine; In terms of gas circuit connection, the high-pressure gas source outlet is connected to the gas filter inlet; the gas filter outlet is connected to the first air inlet through the first one-way electromagnetic pressure reducing valve, and the gas filter outlet is connected to the second air inlet pipe of the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank through the second one-way electromagnetic pressure reducing valve; the air outlet of the high-pressure environment porous membrane tubular bulk micro-nanoscale bubbly flow premixed fuel preparation tank is connected to the air inlet of the booster air pump; the air outlet of the booster air pump is connected to the second air inlet; In terms of signal connection, the input end of the electronic control unit is respectively connected to pressure sensor 1, liquid level sensor 1, pressure sensor 2 and liquid level sensor 2, and the output end of the electronic control unit is respectively connected to the air compressor, constant boost oil pump, high-pressure oil pump, injector, one-way electromagnetic pressure limiting valve, one-way electromagnetic pressure reducing valve 1, one-way electromagnetic pressure reducing valve 2 and one-way solenoid valve.

2. The high-concentration and high-stability premixed fuel preparation and supply system according to claim 1, characterized in that: The three-way valve 1 has two inlets and one outlet. The first inlet is connected to the outlet of the fuel filter, the second inlet is connected to the second outlet of the three-way valve, and the outlet is connected to the inlet of the constant boost oil pump.

3. The high-concentration and high-stability premixed fuel preparation and supply system according to claim 1, characterized in that: The three-way valve 2 has two inlets and one outlet. The inlet 1 is connected to the oil return port of the injector, the inlet 2 is connected to the high-pressure oil rail pressure relief port through a one-way electromagnetic pressure limiting valve, and the outlet is connected to the inlet 2 of the three-way valve 1.

4. The high-concentration and high-stability premixed fuel preparation and supply system according to claim 1, characterized in that: The high-pressure oil rail has an oil inlet, an oil outlet and an oil drain port. The oil inlet is connected to the oil outlet of the high-pressure oil pump, the oil outlet is connected to the injector inlet, and the oil drain port is connected to the second inlet of the three-way valve through a one-way electromagnetic pressure limiting valve.

5. The high-concentration and high-stability premixed fuel preparation and supply system according to claim 1, characterized in that: The one-way electromagnetic pressure reducing valve 1, the one-way electromagnetic pressure reducing valve 2, the one-way electromagnetic valve and the one-way electromagnetic pressure limiting valve are kept in a normally closed state and are opened only when receiving a signal from the electronic control unit.

6. The control method for a high-concentration, high-stability premixed fuel preparation and supply system according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: The electronic control unit is initialized after receiving the power supply signal; Step 2: Liquid level sensor 1 detects the liquid level in the tank; if the liquid level is below the lower limit, the constant pressure boost pump receives the signal to start working, and the one-way solenoid pressure reducing valve 1 receives the signal to open; if the liquid level is above the upper limit, the one-way solenoid pressure reducing valve 1 and the constant pressure boost pump are kept closed; Step 3: Pressure sensor 1 detects the pressure inside the tank; if the pressure is lower than the lower limit, the one-way electromagnetic pressure reducing valve 1 receives the signal and opens; Step 4: Liquid level sensor 2 detects the liquid level in the tank; if the liquid level is lower than the lower limit, the one-way solenoid pressure reducing valve 2 and the one-way solenoid valve receive the signal to open; if the liquid level is higher than the upper limit, the one-way solenoid pressure reducing valve 2 and the one-way solenoid valve receive the signal to close; Step 5: Pressure sensor 2 detects the pressure in the tank; if the pressure is higher than the upper limit, the one-way solenoid pressure reducing valve 1, the one-way solenoid pressure reducing valve 2 and the one-way solenoid valve receive the signal to close, and the booster pump receives the signal to start working; Step 6: The rail pressure sensor determines the pressure of the micro-nanoscale bubbly flow premixed fuel in the high-pressure rail. If the current rail pressure is less than the preset rail pressure, the opening of the high-pressure rail inlet valve is increased. If the current rail pressure is greater than the preset rail pressure, the high-pressure rail drain port is opened, and the fuel flows into the three-way valve 2 through the one-way electromagnetic pressure limiting valve. Step 7: The high-pressure fuel rail supplies fuel to the injector; Step 8: The fuel is sprayed into the engine combustion chamber through the injector, and the uninjected fuel flows into the three-way valve 2 through the return port of the injector; Step 9: Repeat steps 2 to 8 above; Step 10: Upon receiving a stop signal from the electronic control unit, the high-concentration and high-stability premixed fuel preparation and supply system stops working.

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