Bubble flow premixed hydrocarbon fuel preparation, supply system and control method thereof

Abstract

The present invention belongs to the technical field of engine fuel pretreatment, specifically to a bubbly flow premixed hydrocarbon fuel preparation and supply system and a control method thereof, comprising a fuel tank, a fuel filter, a controllable four-way valve, a bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system, a bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device, a gas-liquid separator II, a high-pressure fuel pump, a high-pressure fuel rail, a fuel injector, a controllable three-way valve, an electronic control unit, a bubble concentration sensor I, a liquid level sensor, a bubble concentration sensor II, a fuel rail pressure sensor, an electronic control unit and a controllable three-way valve: the fuel tank outlet is connected to the fuel filter inlet to filter liquid fuel impurities and prevent the fuel supply system from being blocked. The structure is reasonable, and the hydrocarbon fuel can be pretreated, the mixing uniformity of the fuel and air can be improved, and the engine fuel combustion process can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of engine fuel pretreatment, in particular to a bubbly flow premixed hydrocarbon fuel preparation and supply system and a control method thereof. Background Art

[0002] At present, the main methods to improve the uniformity of fuel-air mixing are high-pressure injection technology, variable valve technology, intake coordinated control, etc. Although the application of the above technologies can improve the atomization degree of fuel and improve the uniformity of mixing, if the current technical route is used to further improve the uniformity of mixing, it will greatly increase the complexity of the engine system and control, increase the requirements of the actuator on the material strength, and greatly increase the manufacturing cost of the vehicle.

[0003] By premixing fuel and air at the nanoscale, the properties of the fuel can be improved, the mixing uniformity of the fuel and air can be effectively improved, the thermal efficiency of the engine can be improved, and the emission of incomplete combustion products can be reduced. However, the current bulk nanoscale bubble flow hydrocarbon fuel preparation and supply system is mainly used in experimental research, and the preparation rate and supply stability cannot meet the standards for actual vehicle application.

[0004] In order to solve the above problems, the present invention proposes a bulk nanoscale bubble flow hydrocarbon fuel preparation and supply system that can be applied to existing automobile power systems. The system can pre-treat hydrocarbon fuels, improve the mixing uniformity of fuel and air, and improve the engine fuel combustion process. A control method for this system is also proposed. The present invention proposes a bulk nanoscale bubble flow hydrocarbon fuel preparation and supply system that can be applied to existing automobile power systems. The system can pre-treat hydrocarbon fuels, improve the mixing uniformity of fuel and air, and improve the engine fuel combustion process. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the problems existing in the existing bubbly flow premixed hydrocarbon fuel preparation and supply system and control method thereof, the present invention is proposed.

[0007] Therefore, the purpose of the present invention is to provide a bubbly flow premixed hydrocarbon fuel preparation, supply system and control method thereof, which can achieve pretreatment of hydrocarbon fuel, improve the mixing uniformity of fuel and air, and improve the engine fuel combustion process.

[0008] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0009] A bubbly flow premixed hydrocarbon fuel preparation and supply system and a control method thereof, comprising a fuel tank, a fuel filter, a controllable four-way valve, a bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system, a bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device, a second gas-liquid separator, a high-pressure fuel pump, a high-pressure fuel rail, a fuel injector, a controllable three-way valve, an electronic control unit, a first bubble concentration sensor, a liquid level sensor, a second bubble concentration sensor, a fuel rail pressure sensor, an electronic control unit and a controllable three-way valve:

[0010] The fuel tank outlet is connected to the fuel filter inlet to filter liquid fuel impurities and prevent the fuel supply system from being blocked;

[0011] The fuel filter outlet, the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device outlet, and the controllable three-way valve outlet valve 3 are respectively connected to the inlet 1, inlet 2, and inlet 3 of the controllable four-way valve. The inlet valve 1 and valve 2 of the controllable four-way valve, and the outlet valve 3 and valve 4 of the controllable three-way valve can be controlled by an electronic control unit, and different working modes can be switched by switches of different valve bodies to meet the engine's demand for the bubble concentration of the bulk nanoscale bubbly flow premixed hydrocarbon fuel.

[0012] The bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system comprises a low-pressure oil pump, a nanobubble generator, an air filter, and an air pump; the outlet of the controllable four-way valve is connected to the inlet of the low-pressure oil pump, the outlet of the low-pressure oil pump is connected to the liquid inlet of the nanobubble generator, the outlet of the air filter is connected to the inlet of the air pump, the outlet of the air pump is connected to the gas inlet of the nanobubble generator, and the outlet of the nanobubble generator is connected to the inlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device; under the mechanical action of the nanobubble generator, the hydrocarbon fuel and the gas are fully mixed, and the gas is broken into nanoscale bubbles under the action of shear force in the hydrocarbon fuel liquid phase and is stable in the hydrocarbon fuel for a long time, forming a bulk nanoscale bubbly flow premixed hydrocarbon fuel and supplying it to the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device for refinement and storage;

[0013] The bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device is integrated with a gas-liquid separator 1, a liquid level sensor, and a bubble concentration sensor; the gas outlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device is connected to the engine intake manifold, and the oil outlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device is connected to the gas-liquid separator 2; the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device stratifies bulk nanoscale bubbly flow premixed hydrocarbon fuels of different concentrations through flotation, and sucks out bulk nanoscale bubbly flow premixed hydrocarbon fuels with larger bubble sizes through the oil return outlet for refinement to obtain target size The gas-liquid separator is installed on the top of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device to separate the macro bubbles in the bulk nanoscale bubbly flow premixed hydrocarbon fuel from the hydrocarbon fuel, and supply the gas mixed with hydrocarbon fuel vapor to the engine through the intake manifold to participate in combustion; the liquid level sensor transmits the liquid level signal to the electronic control unit for processing by measuring the liquid level; the bubble concentration sensor is installed near the oil return outlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device to transmit the bubble concentration signal of the bulk nanoscale bubbly flow premixed hydrocarbon fuel to the electronic control unit for processing;

[0014] The second inlet of the gas-liquid separator is connected to the oil outlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device and the controllable three-way valve outlet valve 4, and the second outlet of the gas-liquid separator is connected to the inlet of the high-pressure oil pump;

[0015] The high-pressure oil pump outlet is connected to the high-pressure oil rail oil inlet, the high-pressure oil rail oil outlet is connected to the fuel injector, the high-pressure oil rail pressure regulating valve is connected to the controllable three-way valve inlet, and the pressure regulating valve is controlled by the electronic control unit to control the opening and closing of the high-pressure oil rail pressure, thereby establishing a high-pressure environment for the bulk nanoscale bubbly flow premixed hydrocarbon fuel, reducing the injection time and further promoting the atomization quality after injection;

[0016] The inlet of the electronic control unit is connected to the bubble concentration sensor 1 and the liquid level sensor in the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device, the oil rail pressure sensor and the bubble concentration sensor 2 of the high-pressure oil rail; the outlet of the electronic control unit is connected to the controllable four-way valve, the controllable three-way valve, the high-pressure oil rail pressure regulating valve, the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system and the high-pressure oil pump; the rail pressure control of the fuel supply system and the switching of different modes are completed by the electronic control unit controlling the actuator.

[0017] As a preferred solution of the bubbly flow premixed hydrocarbon fuel preparation and supply system and control method thereof described in the present invention, the high-pressure fuel rail is provided with a second bubble concentration sensor to obtain a bubble concentration signal of the bulk nanoscale bubbly flow premixed hydrocarbon fuel in the high-pressure fuel rail, which is used to determine the fuel supply cycle and can also be used for fault diagnosis and analysis.

[0018] As a preferred embodiment of the bubbly flow premixed hydrocarbon fuel preparation and supply system and control method thereof described in the present invention, the following steps are included:

[0019] Step 1: determining whether the bulk nanoscale bubbly flow premixed hydrocarbon fuel needs to be supplemented and prepared according to the liquid level sensor signal in the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device.

[0020] Step 2: Determine whether the bulk nanoscale bubbly flow premixed hydrocarbon fuel in the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device needs to be refined or re-prepared based on a signal from a bubble concentration sensor in the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device.

[0021] Step 3: Determine the cycle used for fuel supply and whether to re-refine the bulk nano-scale bubbly flow premixed hydrocarbon fuel in the high-pressure fuel rail according to the signals of the bubble concentration sensor 1 and the bubble concentration sensor 2.

[0022] Step 4: Wait for the engine start signal and wait for the rail pressure to be established.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: through the ingenious arrangement and connection of various devices, the bulk nanoscale bubbly flow premixed hydrocarbon fuel required by the engine can be quickly prepared, and the bulk nanoscale bubbly flow premixed hydrocarbon fuel can be quickly supplied to the engine while ensuring the smooth operation of the engine, thereby utilizing the properties of the bulk nanoscale bubbly flow to improve the oxygen concentration, premixing ratio and mixing uniformity of the fuel during the spray process, thereby achieving the purpose of promoting efficient and clean combustion of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0025] Figure 1 A schematic diagram of the structure of a vehicle bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation and supply system and a control method thereof;

[0026] Figure 2 The present invention is a logic block diagram of the preparation and supply control method of bulk nanoscale bubbly flow premixed hydrocarbon fuel.

[0027] In the figure; 1-fuel tank, 2-fuel filter, 3-controllable four-way valve, 4-bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system, 5-low-pressure fuel pump, 6-air filter, 7-nano bubble generator, 8-air pump, 9-bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device, 10-gas-liquid separator II, 11-high-pressure fuel pump, 12-gas-liquid separator I, 13-high-pressure fuel rail, 14-bubble concentration sensor I, 15-intake manifold, 16-engine, 17-injector, 18-high-pressure fuel rail, 19-bubble concentration sensor II, 20-fuel rail pressure sensor, 21-electronic control unit, 22-controllable three-way valve. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] The bubbly flow premixed hydrocarbon fuel preparation and supply system and control method thereof include a fuel tank 1, a fuel filter 2, a controllable four-way valve 3, a bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4, a bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9, a gas-liquid separator 2 10, a high-pressure oil pump 11, a high-pressure oil rail 18, an injector 17, a controllable three-way valve 22, an electronic control unit 21, a bubble concentration sensor 13, a liquid level sensor 14, a bubble concentration sensor 2 19, an oil rail pressure sensor 20, an electronic control unit 21, and a controllable three-way valve 22. The hydrocarbon fuel is preliminarily processed by the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4 to generate bulk nanoscale bubbly flow premixed hydrocarbon fuel, enters the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9 for refinement and storage, then enters the high-pressure oil rail 18 to establish rail pressure, and finally receives an engine start signal and is injected into the engine by the injector to mix with air for combustion.

[0034] In terms of oil circuit connection, the outlet of the oil tank 1 is connected to the inlet of the fuel filter 2; the inlet of the fuel filter 2 is connected to the inlet valve 1 of the controllable four-way valve 3; the outlet of the controllable four-way valve 3 is connected to the inlet of the low-pressure oil pump 5 of the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4; the outlet of the low-pressure oil pump 5 is connected to the liquid inlet of the nano bubble generator 7; the outlet of the nano bubble generator 7 is connected to the inlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9, the oil return port of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9 is connected to the inlet valve 2 of the controllable four-way valve 3, and the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9 is connected to the inlet valve 2 of the controllable four-way valve 3. The oil outlet of the fuel storage device 9 is connected to the inlet 1 of the gas-liquid separator 2 10; the gas outlet of the gas-liquid separator 2 10 is connected to the intake manifold 15, and the outlet of the gas-liquid separator 2 10 is connected to the inlet of the high-pressure oil pump 11; the outlet of the high-pressure oil pump 11 is connected to the inlet of the high-pressure oil rail 18, the oil outlet of the high-pressure oil rail 18 is connected to the injector 17, and the pressure regulating valve of the high-pressure oil rail 18 is connected to the inlet of the controllable three-way valve 22; the outlet valve 3 of the controllable three-way valve 22 is connected to the inlet 3 of the controllable four-way valve 3, and the outlet valve 4 of the controllable three-way valve 22 is connected to the inlet 2 of the gas-liquid separator 2 10; the injection port of the injector 17 is connected to the engine combustion chamber.

[0035] In terms of gas circuit connection, the outlet of the air filter 6 is connected to the inlet of the air pump 8, and the air pump 8 is connected to the gas inlet of the nano bubble generator 7; the gas outlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9 is connected to the engine intake manifold 15.

[0036] In terms of signal connection, the bubble concentration sensor 1 13, the liquid level sensor 14, the bubble concentration sensor 2 19, and the fuel rail pressure sensor 20 are connected to the inlet of the electronic control unit 21, and the outlet of the electronic control unit 21 is connected to the controllable four-way valve 3, the controllable three-way valve 22, the high-pressure fuel rail 18 pressure regulating valve, the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4 and the high-pressure fuel pump 11.

[0037] The preparation of bulk nanoscale bubbly flow premixed hydrocarbon fuel begins, and hydrocarbon fuel is sucked from the fuel tank 1 into the fuel filter 2 for filtration to remove impurities. Then, it enters the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4 through the controllable four-way valve 3 for pretreatment, and the generated bulk nanoscale bubbly flow premixed hydrocarbon fuel enters the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9. If further refinement is required, the bulk nanoscale bubbly flow premixed hydrocarbon fuel enters the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4 through the oil return port of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9 and the controllable four-way valve 3 for further refinement; if refinement is not required, it is temporarily stored in the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9. When the fuel supply starts, the bulk nanoscale bubbly flow premixed hydrocarbon fuel enters the high-pressure fuel rail 18 through the gas-liquid separator 2 10 and the high-pressure oil pump 11 to establish the rail pressure, waits for the engine start signal, and enters the engine through the injector 17. The pressure of the high-pressure fuel rail 18 is regulated by the pressure regulating valve of the high-pressure fuel rail 18. When it is necessary to make the bulk nanoscale bubbly flow premixed hydrocarbon fuel in the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9 quickly enter the high-pressure fuel rail 18, under the premise of meeting the engine starting oil pressure requirement, the hydrocarbon fuel in the high-pressure fuel rail 18 quickly enters the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4 through the controllable three-way valve 22 and the controllable four-way valve 3 for re-preparation / refinement; otherwise, the fuel re-enters the high-pressure fuel rail 18 through the controllable three-way valve 22, the gas-liquid separator 10, and the high-pressure fuel pump 11.

[0038] The present invention proposes a control method for the preparation and supply system of the above-mentioned bulk nanoscale bubbly flow premixed hydrocarbon fuel. The control method is divided into two parts. The first part is the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation and refinement control method to ensure that the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9 stores enough bulk nanoscale bubbly flow premixed hydrocarbon fuel to meet the engine requirements; the second part is the bulk nanoscale bubbly flow premixed hydrocarbon fuel supply control method proposed for the application of bulk nanoscale bubbly flow premixed hydrocarbon fuel to the existing fuel supply system control method to ensure that the concentration of the bulk nanoscale bubbly flow premixed hydrocarbon fuel meets the engine requirements.

[0039] The bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation and refinement control method comprises the following steps:

[0040] Step 1: After receiving the power supply signal, the electronic control unit 21 performs initialization to keep all valve bodies and oil pumps in a closed state.

[0041] Step 2: Determine the liquid level signal obtained by the liquid level sensor 14 in the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device 9. If the liquid level is lower than the minimum liquid level, open the controllable four-way valve 3 and the valve 1 connected to the center of the fuel tank 1; otherwise, perform a second determination. If the liquid level is lower than the maximum liquid level, the states of the valve 1 and the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4 remain unchanged. If the liquid level is higher than the maximum liquid level, the valve 1 is closed.

[0042] Step 3: Further, the bubble concentration signal obtained by the bubble concentration sensor 13 is judged. If the bubble concentration is less than the target bubble concentration, the valve 2 is opened to allow the bulk nanoscale bubbly flow premixed hydrocarbon fuel to return to the nanobubble generator 7 for further refinement; otherwise, the valve 2 is closed, the preparation is completed, and the bulk nanoscale bubbly flow premixed hydrocarbon fuel is supplied to the engine according to the engine requirements.

[0043] The bulk nanoscale bubbly flow premixed hydrocarbon fuel supply control method is improved on the basis of the existing high pressure fuel rail 18 control strategy, and the following steps are added before establishing the rail pressure:

[0044] Step 4: Determine the bubble concentration signal obtained by the bubble concentration sensor 19. If the bubble concentration is greater than the target bubble concentration, open valve 4 and close valve 3. The bulk nanoscale bubble flow premixed hydrocarbon fuel supply preparation is completed and waits for the start signal and the rail pressure to be established. If the bubble concentration is less than the target bubble concentration, determine the bubble concentration signal obtained by the bubble concentration sensor 13. If the bubble concentration is less than the target bubble concentration, open valve 4 and close valve 3. Adjust the opening of the high-pressure rail pressure regulating valve to the maximum, start the high-pressure oil pump, and wait for the rail pressure to be established. Allow the hydrocarbon fuel to pass through the gas-liquid separator 10 to avoid air resistance caused by bubble aggregation and precipitation, which affects the rail pressure establishment. Prioritize the supply preparation and wait for the bulk nanoscale bubble flow premixed hydrocarbon fuel preparation; if the bubble concentration is greater than the target bubble concentration, open valve 3 and close valve 4. Adjust the opening of the high-pressure rail pressure regulating valve to the maximum, and re-refine the bulk nanoscale bubble flow premixed hydrocarbon fuel in the high-pressure rail 18.

[0045] Step 5: Determine whether valves 1, 2, and 3 are all closed. If all are closed, then close the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4; if not, then open the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4.

[0046] Step six: output opening and closing signals of valve 1, valve 2, valve 3, valve 4 and bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system 4.

[0047] Step 7: Wait for the engine start signal and wait for the rail pressure to be established.

[0048] Step 8: Repeat steps 2 to 7 above.

[0049] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A control method for a bubbly flow premixed hydrocarbon fuel preparation and supply system, Features: The bubbly flow premixed hydrocarbon fuel preparation and supply system comprises a fuel tank (1), a fuel filter (2), a controllable four-way valve (3), a bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system (4), a bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9), a second gas-liquid separator (10), a high-pressure fuel pump (11), a high-pressure fuel rail (18), a fuel injector (17), a controllable three-way valve (22), an electronic control unit (21), a first bubble concentration sensor (13), a liquid level sensor (14), a second bubble concentration sensor (19), a fuel rail pressure sensor (20), and a hydrocarbon The fuel is processed by a bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system (4) to generate bulk nanoscale bubbly flow premixed hydrocarbon fuel, enters a bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9) to be refined and stored, then enters a high-pressure fuel rail (18) to establish rail pressure, and finally receives an engine start signal and is injected into the engine by a fuel injector to mix with air for combustion; wherein a bubble concentration sensor 1 (13) is integrated in the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9), and a bubble concentration sensor 2 (19) is provided in the high-pressure fuel rail (18); The controllable four-way valve (3) has three inlets and one outlet; wherein the three inlets of the controllable four-way valve (3) include inlet one, inlet two, and inlet three, and inlet one, inlet two, and inlet three are respectively connected to the outlet of the fuel filter (2), the oil return port of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9), and outlet valve three of the controllable three-way valve (22); the outlet of the controllable four-way valve (3) is connected to the inlet of a low-pressure oil pump (5) of the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system; The controllable three-way valve (22) has an inlet and two outlets, wherein the inlet of the controllable three-way valve (22) is connected to the high-pressure oil rail (18) and the oil return port of the injector (17), and the outlet of the controllable three-way valve (22) includes an outlet valve 3 and an outlet valve 4, and the outlet valve 3 and the outlet valve 4 are respectively connected to the inlet 3 of the controllable four-way valve (3) and the inlet 2 of the gas-liquid separator 2 (10); In terms of oil circuit connection, the outlet of the oil tank (1) is connected to the inlet of the fuel filter (2); the outlet of the fuel filter (2) is connected to the inlet 1 of the controllable four-way valve (3); the outlet of the controllable four-way valve (3) is connected to the inlet of the low-pressure oil pump (5) of the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system (4); the outlet of the low-pressure oil pump (5) is connected to the liquid inlet of the nano bubble generator (7); the outlet of the nano bubble generator (7) is connected to the inlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9); the oil return port of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9) is connected to the inlet 2 of the controllable four-way valve (3); The oil outlet of the bubbly premixed hydrocarbon fuel storage device (9) is connected to the inlet 1 of the gas-liquid separator 2 (10); the outlet of the gas-liquid separator 2 (10) is connected to the inlet of the high-pressure oil pump (11); the outlet of the high-pressure oil pump (11) is connected to the inlet of the high-pressure oil rail (18), the oil outlet of the high-pressure oil rail (18) is connected to the injector (17), and the pressure regulating valve of the high-pressure oil rail (18) is connected to the inlet of the controllable three-way valve (22); the outlet valve 3 of the controllable three-way valve (22) is connected to the inlet 3 of the controllable four-way valve (3), and the outlet valve 4 of the controllable three-way valve (22) is connected to the inlet 2 of the gas-liquid separator 2 (10); the injection port of the injector (17) is connected to the engine combustion chamber; The control method of the bubbly flow premixed hydrocarbon fuel preparation and supply system comprises the following steps: Step 1: After receiving the power supply signal, the electronic control unit (21) performs initialization to keep all valve bodies and oil pumps in a closed state; Step 2: judging the liquid level signal obtained by the liquid level sensor (14) in the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9); if the liquid level is lower than the minimum liquid level, opening the inlet 1 of the controllable four-way valve (3) connected to the fuel tank (1); if the liquid level is higher than the maximum liquid level, closing the inlet 1 of the controllable four-way valve (3); Step 3: Determine the bubble concentration signal obtained by the bubble concentration sensor 1 (13). If the bubble concentration obtained by the bubble concentration sensor 1 (13) is less than the target bubble concentration, open the inlet 2 of the controllable four-way valve (3) to return the bulk nanoscale bubbly flow premixed hydrocarbon fuel to the nanobubble generator (7) for further refinement; otherwise, close the inlet 2 of the controllable four-way valve (3), the preparation is completed, and the bulk nanoscale bubbly flow premixed hydrocarbon fuel is supplied to the engine according to the engine demand; Step 4: Determine the bubble concentration signal obtained by the bubble concentration sensor 2 (19). If the bubble concentration obtained by the bubble concentration sensor 2 (19) is greater than the target bubble concentration, open the outlet valve 4 of the controllable three-way valve (22), close the outlet valve 3 of the controllable three-way valve (22), and wait for the start signal to be completed for the bulk nanoscale bubbly flow premixed hydrocarbon fuel supply. Close the high-pressure oil pump and wait for the oil rail pressure to be established. If the bubble concentration obtained by the bubble concentration sensor 2 (19) is less than the target bubble concentration, determine the bubble concentration signal obtained by the bubble concentration sensor 1 (13). If the bubble concentration obtained by the bubble concentration sensor 1 (13) is less than the target bubble concentration, concentration, then open the outlet valve 4 of the controllable three-way valve (22), close the outlet valve 3 of the controllable three-way valve (22), adjust the opening of the high-pressure oil rail pressure regulating valve to the maximum, start the high-pressure oil pump, wait for the oil rail pressure to be established, and allow the hydrocarbon fuel to pass through the gas-liquid separator 2 (10) to avoid the bubble aggregation and precipitation causing air resistance to affect the rail pressure establishment; if the bubble concentration obtained by the bubble concentration sensor 1 (13) is greater than the target bubble concentration, then open the outlet valve 3 of the controllable three-way valve (22), close the outlet valve 4 of the controllable three-way valve (22), adjust the opening of the high-pressure oil rail pressure regulating valve to the maximum, and re-refine the bulk nanoscale bubble flow premixed hydrocarbon fuel in the high-pressure oil rail (18); Step 5: determining whether the inlet 1 of the controllable four-way valve (3), the inlet 2 of the controllable four-way valve (3), and the outlet valve 3 of the controllable three-way valve (22) are all closed; if all are closed, closing the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system (4); if not all are closed, opening the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system (4); Step 6: outputting the inlet 1 of the controllable four-way valve (3), the inlet 2 of the controllable four-way valve (3), the outlet valve 3 of the controllable three-way valve (22), the outlet valve 4 of the controllable three-way valve (22) and the opening and closing signals of the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system (4); Step 7: Wait for the engine start signal and wait for the rail pressure to be established.

2. The control method of the bubbly flow premixed hydrocarbon fuel preparation and supply system according to claim 1, Features: In terms of gas circuit connection, the outlet of the air filter (6) is connected to the inlet of the air pump (8), and the air pump (8) is connected to the gas inlet of the nano bubble generator (7); the gas outlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9) is connected to the engine intake manifold (15); In terms of signal connection, the bubble concentration sensor 1 (13), the liquid level sensor (14), the bubble concentration sensor 2 (19), and the fuel rail pressure sensor (20) are connected to the inlet of the electronic control unit (21), and the electronic control unit (21) is connected to the controllable four-way valve (3), the controllable three-way valve (22), the high-pressure fuel rail (18) pressure regulating valve, the bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system (4) and the high-pressure fuel pump (11).

3. The control method of the bubbly flow premixed hydrocarbon fuel preparation and supply system according to claim 1, Features: The opening and closing of the inlet valve 1 of the inlet 1 and the inlet valve 2 of the inlet 2 of the controllable four-way valve (3) are controlled by an opening and closing signal of the electronic control unit.

4. The control method of the bubbly flow premixed hydrocarbon fuel preparation and supply system according to claim 1, Features: The opening and closing of the outlet valve 3 and the outlet valve 4 of the controllable three-way valve (22) are controlled by the opening and closing signals of the electronic control unit (21).

5. The control method of the bubbly flow premixed hydrocarbon fuel preparation and supply system according to claim 1, Features: The bulk nanoscale bubbly flow premixed hydrocarbon fuel preparation system (4) comprises a low-pressure oil pump (5), a nanobubble generator (7), an air filter (6), and an air pump (8); the outlet of the low-pressure oil pump (5) is connected to the liquid inlet of the nanobubble generator (7), the outlet of the air filter (6) is connected to the inlet of the air pump (8), and the outlet of the air pump (8) is connected to the gas inlet of the nanobubble generator (7); wherein the nanobubble generator adopts the method of mechanically cutting and breaking bubbles with an impeller, ultrasonic cavitation, porous membrane penetration or pressure change to prepare the bulk nanoscale bubbly flow premixed hydrocarbon fuel.

6. The control method of the bubbly flow premixed hydrocarbon fuel preparation and supply system according to claim 1, Features: The bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9) is also integrated with a gas-liquid separator 1 (12) and a liquid level sensor (14); the gas outlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9) is connected to an engine intake manifold (15), the oil outlet of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9) is connected to a gas-liquid separator 2 (10), and the gas outlet of the gas-liquid separator 2 (10) is connected to the engine intake manifold (15); the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9) stratifies bulk nanoscale bubbly flow premixed hydrocarbon fuels of different concentrations through flotation, and separates bulk nanoscale bubbly flow premixed hydrocarbon fuels of large-scale bubbles into layers. The hydrocarbon fuel is sucked out through the oil return outlet for refinement to obtain a bulk nanoscale bubbly flow of target size; the gas-liquid separator (12) is installed on the top of the bulk nanoscale bubbly flow premixed hydrocarbon fuel storage device (9) to separate the macro bubbles in the bulk nanoscale bubbly flow premixed hydrocarbon fuel from the hydrocarbon fuel, and supply the gas mixed with hydrocarbon fuel vapor to the engine through the intake manifold (15) to participate in combustion; the liquid level sensor (14) transmits the liquid level signal to the electronic control unit (21) for processing by measuring the liquid level; the bubble concentration sensor (13) transmits the bubble concentration signal of the bulk nanoscale bubbly flow premixed hydrocarbon fuel to the electronic control unit (21) for processing.

7. The control method of the bubbly flow premixed hydrocarbon fuel preparation and supply system according to claim 1, Features: The bubble concentration sensor 1 (13) and the bubble concentration sensor 2 (19) characterize the nanoscale bubble concentration in the hydrocarbon fuel by measuring the oxygen concentration and zeta potential in the hydrocarbon fuel.

8. The control method of the bubbly flow premixed hydrocarbon fuel preparation and supply system according to claim 1, Features: The second bubble concentration sensor (19) provided in the high-pressure fuel rail (18) is used to obtain a bubble concentration signal of the bulk nanoscale bubble flow premixed hydrocarbon fuel in the high-pressure fuel rail, which is used to determine the fuel supply cycle and can also be used for fault diagnosis and analysis.

Images