Methanol-diesel oil dual-fuel internal mixing type oil injector capable of being independently controlled

Abstract

The invention relates to the field of power and energy engineering, in particular to a methanol-diesel dual-fuel internal mixing type fuel injector capable of being independently controlled. In order to overcome the defects that in the prior art, a dual-fuel injection system is complex in structure, the size of an oil injector is large, a cylinder cover is difficult to install, the fuel premixing capacity is poor, and injection control is not flexible, the technical scheme is that the methanol-diesel oil dual-fuel internal mixing type oil injector capable of being independently controlled comprises an oil injector shell; the fuel injector shell is provided with a methanol fuel inlet, a diesel fuel inlet, a fuel injection hole as well as a methanol oil way and a diesel oil way which are respectively connected with the methanol fuel inlet and the diesel fuel inlet; a methanol control assembly, a diesel oil control assembly, a pressure control chamber, a ball valve, a needle valve and a premixing pressure cavity are arranged in the oil injector, injection of methanol and injection of diesel oil can be controlled respectively, and mixed injection of two kinds of fuel can be achieved in the premixing pressure cavity. The methanol-diesel oil dual-fuel efficient mixed injection system is suitable for modification work of an engine oil injection system needing to achieve methanol-diesel oil dual-fuel efficient mixed injection and precise control in the fields of ship power, heavy vehicles, engineering machinery and the like.

Description

Technical Field

[0001] The present invention relates to the field of power and energy engineering, and in particular to a methanol-diesel dual-fuel internal mixing injector that can be independently controlled. Background Art

[0002] In the fields of ship propulsion, heavy vehicles and construction machinery, traditional diesel engines are still widely used due to their advantages such as high calorific value and high energy density. However, the emissions of pollutants such as particulate matter (PM), carbon monoxide (CO) and nitrogen oxides (NOx) in their combustion products can no longer meet the requirements of increasingly stringent environmental regulations. Promoting clean fuel alternative technologies has become a key research direction.

[0003] Methanol, a new clean fuel, is considered a promising diesel alternative due to its advantages, including low carbon emissions, high oxygen content, low price, widespread availability, and ease of storage and transportation at room temperature and pressure. Research has found that the high oxygen content in methanol molecules improves combustion efficiency and reduces CO and PM emissions. Its high latent heat of vaporization also helps lower combustion temperatures, effectively controlling NOx generation at the source.

[0004] To balance the cleanliness of methanol with the stability of diesel, methanol-diesel dual-fuel technology is currently being widely researched. This involves injecting a small proportion of diesel to ignite methanol, improving ignition reliability and combustion stability. For example, prior art discloses a methanol-diesel dual-fuel injection system that controls the injection of diesel and methanol separately by providing two independent injectors. However, this type of solution typically relies on two injectors positioned separately on the cylinder head, which not only requires high engine structural modifications but also suffers from poor injection synchronization and poor mixing uniformity in the cylinder during actual operation, making it difficult to achieve precise control of different loads and fuel ratios.

[0005] Some research has attempted to implement dual-fuel switching control within a single injector. For example, existing technologies have proposed a dual-fuel switching injection structure. However, this approach still primarily relies on a "switching" approach and fails to achieve synchronous premixing of the two fuels within the injector. Furthermore, key performance indicators such as injection control accuracy, response speed, and mixing consistency remain insufficient. This is particularly evident in real-world multi-operating-condition applications, resulting in complex systems, high control coupling, and a lack of injection pattern flexibility.

[0006] In summary, the existing technology has the following defects: complex structure of dual fuel injection system, large injector volume, difficult cylinder head installation, poor fuel premixing ability and inflexible injection control. Summary of the Invention

[0007] To address the defects of the prior art dual fuel injection system, such as complex structure, large injector volume, difficult cylinder head installation, poor fuel premixing capability, and inflexible injection control, the present invention provides the following technical solutions: A methanol-diesel dual-fuel internal mixing injector with independent controllable function, comprising: An injector housing, wherein the injector housing is provided with a methanol fuel inlet, a diesel fuel inlet, an injection hole, and methanol fuel lines and diesel fuel lines connected thereto; The injector is internally provided with a methanol control component, a diesel control component, a pressure control chamber, a ball valve, a needle valve and a premixing pressure chamber, which can control the injection of methanol and diesel separately and realize the mixed injection of the two fuels in the premixing pressure chamber.

[0008] Furthermore, a preferred embodiment is provided, in which the methanol control component includes a plunger 1 and an oil hole 1A arranged on the methanol oil circuit, and an electromagnet 1A and an electromagnet 1B for driving the plunger 1 to move up and down.

[0009] Furthermore, a preferred embodiment is provided, in which the diesel control assembly includes a plunger 2 and an oil through hole 2A and an oil through hole 2B arranged on the diesel oil circuit, and an electromagnet 2A and an electromagnet 2B for driving the plunger 2 to move up and down.

[0010] Furthermore, a preferred embodiment is provided, in which the pressure control chamber is connected to the pressure control oil circuit through the oil inlet hole, and is used to push the needle valve to close the oil injection hole under high pressure.

[0011] Furthermore, a preferred embodiment is provided in which the ball valve is arranged between the pressure control chamber and the oil return chamber, and is opened or closed by electromagnet three A and electromagnet three B to adjust the pressure relief state of the pressure control chamber.

[0012] Furthermore, a preferred embodiment is provided in which the premixing pressure chamber is arranged below the needle valve and is connected to the methanol oil circuit and the diesel oil circuit for mixing the two fuels before injection.

[0013] A method for controlling a methanol-diesel dual-fuel internal mixing injector that can be independently controlled is also provided, which is used to control the injector, comprising: a step of controlling an open or closed state of a methanol passage and a diesel passage according to an injection mode; In methanol injection mode, the methanol oil circuit is opened, and the diesel oil circuit and pressure control oil circuit are closed; In diesel injection mode, the diesel oil circuit and the pressure control oil circuit are opened, and the methanol oil circuit is closed; In dual fuel injection mode, the methanol oil circuit, diesel oil circuit and pressure control oil circuit are opened at the same time; During the injection start-up phase, the ball valve is opened to release the oil pressure in the pressure control chamber, and the needle valve is pulled up to complete the injection; At the end of injection, the ball valve is closed to restore the oil pressure, and the needle valve control is disconnected to reset it and close the injection hole.

[0014] A computer storage medium is also provided for storing a computer program, and when the computer program is read by a computer, the computer executes the method.

[0015] A computer is also provided, comprising a processor and a storage medium, wherein when the processor reads a computer program stored in the storage medium, the computer executes the method.

[0016] A computer program product is also provided, which is a computer program that implements the method when the computer program is executed.

[0017] Compared with the prior art, the technical solution provided by the present invention is beneficial in that: By installing an independent methanol control valve structure within the injector—composed of plunger 1, oil hole 1A, coil 1A, coil 1B, electromagnet 1A, and electromagnet 1B—the system achieves highly responsive and controllable opening and closing of the methanol fuel circuit, ensuring excellent independent control of the methanol injection process. Compared to the existing crude method of controlling methanol supply through a vehicle-level fuel solenoid valve, this approach provides greater timing precision and flow stability for methanol fuel injection, facilitating optimal methanol ratio matching under different operating conditions.

[0018] By installing an independent diesel control valve structure inside the injector—composed of plunger 2, oil holes 2A and 2B, coils 2A and 2B, and electromagnets 2A and 2B—the system can synchronously control the on / off states of the diesel oil circuit and the pressure control circuit. This allows for disconnection of the main diesel flow path while ensuring injection triggering, enabling refined diesel ignition control and optimized fuel conservation. Compared to the single pressure control structure used in existing technologies, this approach offers greater flexibility and stability, significantly improving fuel economy and injection control precision.

[0019] A premix pressure chamber is located within the injector, below the needle valve and above the injection port. This chamber serves as a shared mixing space for methanol and diesel before injection, enhancing fuel mixing uniformity in the internal-mix injection mode. Compared to the unstable in-cylinder mixing process of traditional dual-injector configurations, this internal-mix design completes the mixing process before injection, significantly improving mixing efficiency and combustion consistency, while effectively reducing the risk of in-cylinder knock and emissions fluctuations.

[0020] Active pressure relief and closing in the pressure control chamber are achieved through the installation of a ball valve and a matching solenoid control mechanism. This structure comprises the ball valve, coil 3A, solenoid 3A, and solenoid 3B. This mechanism, combined with the needle valve, precisely controls injection timing and duration, resolving issues with traditional injectors that can cause secondary injection or incomplete injection due to delayed oil pressure recovery, thereby enhancing the reliability and consistency of the injection process.

[0021] Electromagnet 4A and coil 4A are used in conjunction to control the needle valve lifting action. After the pressure is released, the needle valve is actively pulled up by magnetic force. Compared with the traditional spring-reset structure, it has faster response and more precise control, which can effectively shorten the fuel injection delay time and improve the dynamic response performance of the engine. It is especially suitable for advanced injection strategies such as high-frequency injection and multi-pulse injection.

[0022] By integrating the methanol fuel control mechanism, diesel fuel control mechanism, mixing mechanism, and injection control mechanism into the same injector structure, the system achieves switching control of multiple injection modes without increasing the number of cylinder head openings. The system has a compact structure and high integration, making it suitable for rapid retrofitting of existing engine platforms. Compared with alternative solutions on the market that require increasing the number of injectors or replacing the cylinder head, this approach significantly reduces system modification costs and engineering difficulty.

[0023] It is suitable for engine fuel injection system modification work in the fields of ship power, heavy vehicles and engineering machinery, which requires efficient methanol-diesel dual-fuel mixed injection and precise control. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a methanol-diesel dual-fuel internal mixing injector that can be independently controlled.

[0025] Figure 2 This is a schematic diagram of the plunger structure of the methanol oil circuit control valve (left view).

[0026] Figure 3 This is a schematic diagram of the plunger 2 structure of the diesel oil circuit control valve (left view).

[0027] Figure 4 This is a schematic diagram of the dual-fuel internal mixing injection mode structure of the methanol-diesel dual-fuel internal mixing injector that can be independently controlled.

[0028] Figure 5 This is a schematic diagram of the methanol injection mode structure of the methanol-diesel dual-fuel internal mixing injector that can be independently controlled.

[0029] Figure 6 This is a schematic diagram of the diesel injection mode structure of the methanol-diesel dual-fuel internal mixing injector that can be independently controlled.

[0030] Among them, 1-return oil channel, 2-electromagnet 3A, 3-coil 3A, 4-methanol fuel inlet, 5-electromagnet 1A, 6-coil 1A, 7-pressure control chamber, 8-plunger 1, 9-coil 1B, 10-electromagnet 1B, 11-coil 4A, 12-needle valve, 13-premix pressure chamber, 14-injection hole, 15-power cord, 16-return oil chamber, 17-ball valve, 18-diesel fuel inlet, 19-electromagnet 2A, 20-coil 2A, 21-oil drain hole, 22-oil inlet hole, 23-pressure control oil circuit, 24-plunger 2, 25-coil 2B, 26-electromagnet 2B, 27-electromagnet 3B, 28-electromagnet 4A, 29-injector housing, 30-oil hole 1A, 31-oil hole 2A, 32-oil hole 2B, 101-methanol oil circuit, 102-diesel oil circuit. DETAILED DESCRIPTION

[0031] In order to make the advantages and benefits of the technical solution provided by the present invention more clearly reflected, the technical solution provided by the present invention is now further described in detail with reference to the accompanying drawings, specifically: Embodiment 1: This embodiment provides a methanol-diesel dual-fuel internal mixing injector that can be independently controlled, including: An injector housing, wherein the injector housing is provided with a methanol fuel inlet, a diesel fuel inlet, an injection hole, and methanol fuel lines and diesel fuel lines connected thereto; The injector is internally provided with a methanol control component, a diesel control component, a pressure control chamber, a ball valve, a needle valve and a premixing pressure chamber, which can control the injection of methanol and diesel separately and realize the mixed injection of the two fuels in the premixing pressure chamber.

[0032] The methanol control assembly includes a plunger 1 and an oil hole 1A arranged on the methanol oil line, and an electromagnet 1A and an electromagnet 1B for driving the plunger 1 to move up and down.

[0033] The diesel control component includes a plunger 2 and oil holes 2A and 2B arranged on the diesel oil circuit, as well as electromagnets 2A and 2B for driving the plunger 2 to move up and down.

[0034] The pressure control chamber is connected to the pressure control oil circuit through the oil inlet hole, and is used to push the needle valve to close the injection hole under high pressure.

[0035] The ball valve is set between the pressure control chamber and the oil return chamber, and is controlled to open or close by electromagnet 3A and electromagnet 3B to adjust the pressure relief state of the pressure control chamber.

[0036] The premixing pressure chamber is arranged below the needle valve and is connected to the methanol oil circuit and the diesel oil circuit for mixing the two fuels before injection.

[0037] A method for controlling a methanol-diesel dual-fuel internal mixing injector that can be independently controlled is also provided, which is used to control the injector, comprising: a step of controlling an open or closed state of a methanol passage and a diesel passage according to an injection mode; In methanol injection mode, the methanol oil circuit is opened, and the diesel oil circuit and pressure control oil circuit are closed; In diesel injection mode, the diesel oil circuit and the pressure control oil circuit are opened, and the methanol oil circuit is closed; In dual fuel injection mode, the methanol oil circuit, diesel oil circuit and pressure control oil circuit are opened at the same time; During the injection start-up phase, the ball valve is opened to release the oil pressure in the pressure control chamber, and the needle valve is pulled up to complete the injection; At the end of injection, the ball valve is closed to restore the oil pressure, and the needle valve control is disconnected to reset it and close the injection hole.

[0038] Implementation Method 2: This implementation method further describes the technical solution provided in Implementation Method 1 in detail. Specifically: A methanol-diesel dual-fuel, independently controllable internal mixing injector enables independent injection control or coordinated mixed injection of methanol and diesel fuels within a single injector, effectively improving injection response speed and mixing uniformity, and adapting to fuel switching and injection modes under various operating conditions. The injector has a compact structure, making it easy to install in existing engine cylinder head structures, and offers excellent engineering adaptability and control flexibility.

[0039] It includes an injector housing, a methanol fuel passage control structure, a diesel fuel passage control structure, a pressure control structure, an injection control structure, and a premixing pressure chamber.

[0040] The injector housing 29 is the installation body of the device, and is provided with a methanol fuel inlet 4, a diesel fuel inlet 18, a methanol oil circuit 101, a diesel oil circuit 102, a pressure control oil circuit 23, an oil inlet hole 22, an oil drain hole 21, an oil return chamber 16 and an oil return channel 1.

[0041] The methanol fuel passage control structure includes plunger 8, oil hole A 30, coil A 6, coil B 9, electromagnet A 5, and electromagnet B 10. Plunger 8 is positioned perpendicular to the center axis of the methanol fuel passage, with oil hole A 30 located in the center of the plunger. When electromagnet B is energized and electromagnet A is de-energized, plunger 1 moves downward, aligning oil hole A with methanol fuel passage 101 and allowing methanol fuel to flow. Conversely, oil hole A deviates from the methanol fuel passage, shutting off methanol fuel flow.

[0042] The diesel fuel passage control structure includes plunger 24, oil hole 2A 31, oil hole 2B 32, coil 2A 20, coil 2B 25, electromagnet 2A 19, and electromagnet 2B 26. Plunger 2 is located at the junction of the diesel fuel circuit and the pressure control circuit. When electromagnet 2B is energized and electromagnet 2A is de-energized, plunger 2 moves downward, aligning oil hole 2A with the pressure control circuit and oil hole 2B with the diesel fuel circuit, allowing diesel to flow into the injector. Otherwise, the two circuits are disconnected.

[0043] The pressure control structure includes pressure control oil circuit 23, oil inlet 22, pressure control chamber 7, ball valve 17, coil 3A3, electromagnet 3A2, and electromagnet 3B 27. The pressure control oil circuit introduces high-pressure diesel fuel into pressure control chamber 7, hydraulically compressing needle valve 12 downward. When ball valve 17 opens, the high-pressure fuel in the pressure control chamber is released through drain hole 21, oil return chamber 16, and oil return channel 1. The oil pressure above the needle valve drops, creating conditions for injection.

[0044] The ball valve control section is wound around the upper end of the ball valve through coil 3A3, which works in conjunction with electromagnets 3A2 and 3B27. When electromagnet 3A is energized, the ball valve opens upward to relieve pressure; when electromagnet 3B is energized, the ball valve moves downward to close and restore the seal.

[0045] The injection control structure includes a needle valve 12, a coil 11, and an electromagnet 28. Coil 11 is wound around the upper end of the needle valve. When electromagnet 28 is energized, coil 11 attracts coil 11, lifting the needle valve and enabling fuel injection. When electromagnet 28 is de-energized, the needle valve returns to its original position and drops downward, closing the injection port 14, due to the combined effects of increased pressure in the upper chamber and the weight of the needle valve.

[0046] The injection hole 14 is set at the very end of the injector and is the fuel output port; the premixing pressure chamber 13 is formed between the lower end of the needle valve and the injector housing, which is used for the preliminary mixing of the fuel in the dual-fuel injection mode, so that the methanol and diesel are evenly atomized before being sprayed, thereby improving combustion efficiency.

[0047] In actual work, three spray modes can be realized: In methanol injection mode, only plunger 1 is controlled to conduct the methanol oil circuit, while plunger 2 is disconnected from the diesel oil circuit. After the needle valve is opened, methanol is sprayed out independently. In diesel injection mode, plunger 2 is controlled to connect the diesel oil circuit, while plunger 1 disconnects the methanol oil circuit. After the needle valve is opened, diesel is sprayed out independently. In the dual-fuel internal mixing injection mode, the methanol oil circuit and the diesel oil circuit are opened at the same time. The two fuels are mixed in the premixing pressure chamber and then sprayed out through the needle valve and the injection hole.

[0048] The power line 15 in the above structure is connected to each electromagnet to provide driving current for the entire control system.

[0049] Implementation Method 3: Combination Figure 1-6 This embodiment further describes the above technical solution in detail through specific examples, specifically: like Figure 1 As shown, a methanol-diesel dual-fuel independently controllable internal mixing injector in this embodiment mainly includes an injector housing 29, a needle valve 12, an injection hole 14, and a ball valve 17. The injector housing is provided with a methanol fuel inlet 4, a diesel fuel inlet 18, a methanol oil circuit 101, and a diesel oil circuit 102.

[0050] The opening and closing of the methanol oil circuit 101 in this embodiment is controlled by a control valve composed of a plunger 8, a coil 1A6, a coil 1B9, an electromagnet 1A5 and an electromagnet 1B10. The electromagnet 1A5 and the electromagnet 1B10 are respectively arranged on the upper and lower sides of the plunger 8. Figure 2 This is a left side view of plunger 8. The plunger is cylindrical and features an oil hole A30. Coil A6 and coil B9 are connected to its upper and lower ends, respectively. When electromagnet A5 is energized and electromagnet B10 is de-energized, plunger 8 moves upward. This causes oil hole A30 to become misaligned with methanol fuel line 101, disrupting methanol fuel delivery. De-energizing electromagnet A5 and energizing electromagnet B10 causes plunger 8 to move downward. This aligns oil hole A30 with methanol fuel line 101, unblocking it and allowing normal methanol fuel injection.

[0051] The opening and closing of the diesel oil circuit 102 in this embodiment is controlled by a control valve composed of a plunger 24, a coil 2 A20, a coil 2 B25, an electromagnet 2 A19 and an electromagnet 2 B26. The electromagnet 2 A19 and the electromagnet 2 B26 are respectively arranged on the upper and lower sides of the plunger 24. Figure 3 This is a left view of plunger 2. The plunger is cylindrical and features two oil holes A31 and B32. Coil A20 and B25 are connected to its upper and lower ends, respectively. When electromagnet A19 is energized and electromagnet B26 is de-energized, plunger 24 moves upward. This causes oil hole A31 to misalign with pressure control oil circuit 23, while oil hole B32 is misaligned with diesel fuel circuit 102 and aligned with pressure control oil circuit 23, interrupting diesel fuel delivery. When electromagnet A19 is de-energized and electromagnet B26 is energized, plunger 24 moves downward. This causes oil hole A31 to align with pressure control oil circuit 23, while oil hole B32 aligns with diesel fuel circuit 102. This aligns diesel fuel circuit 102, allowing normal diesel fuel injection.

[0052] The pressure control oil circuit 23 of this embodiment is connected to the pressure control chamber 7 through the oil inlet hole 22. High-pressure diesel is supplied to the pressure control chamber 7 through the pressure control oil circuit 23 to force the needle valve 12 to move downward to close the injection hole 14, thereby interrupting the injection.

[0053] In this embodiment, the pressure control chamber 7 is connected to the oil return chamber 16 via the oil drain hole 21 and the ball valve 17. The oil return chamber 16 is connected to the oil return channel 1. A coil 3 A3 is wound around the upper end of the ball valve 17, and electromagnet 3 A2 and electromagnet 3 B 27 are positioned at the upper and lower ends of the ball valve 17, respectively. When electromagnet 3 A2 is energized and electromagnet 3 B 27 is deenergized, the ball valve 17 moves upward. This allows the high-pressure fuel in the pressure control chamber 7 to flow through the oil drain hole 21, the ball valve 17, and the oil return chamber 16, ultimately returning through the oil return channel 1. When electromagnet 3 A2 is deenergized and electromagnet 3 B 27 is energized, the ball valve 17 moves downward. At this point, the high-pressure fuel in the pressure control chamber 7 cannot return, and the pressure generated in the pressure control chamber 7 forces the needle valve 12 to move downward, closing the injection port 14.

[0054] In this embodiment, the needle valve 12 has a coil 24A11 wound around its upper end and an electromagnet 24A28 attached. When electromagnet 24A28 is energized, it generates a magnetic force that attracts the coil 24A11, which in turn activates the ball valve 17. Diesel fuel in the pressure control chamber 7 is released and returned through the oil drain hole 21, the ball valve 17, the oil return chamber 16, and the oil return passage 1, lifting the needle valve 12 and injecting fuel.

[0055] In this embodiment, a premix pressure chamber 13 is formed between the lower end of the needle valve 12 and the injector housing 29. This premix pressure chamber 13 can stabilize the fuel pressure and ensure that the fuel is fully mixed when the injector switches to dual-fuel internal mixing injection.

[0056] The oil drain hole 21 and oil inlet hole 22 of this embodiment can throttle and stabilize the diesel fuel in the pressure control chamber 7, preventing drastic changes in the diesel fuel pressure in the pressure control chamber 7. This allows the diesel fuel pressure in the pressure control chamber 7 to steadily decrease when the ball valve 17 opens, thereby causing the needle valve 12 to lift due to the pressure differential and the action of the solenoid valve 28.

[0057] The power supply line 15 of this embodiment can be connected to an external power source and provide power to electromagnet 1 A5, electromagnet 1 B10, electromagnet 2 A19, electromagnet 2 B26, electromagnet 3 A2, electromagnet 3 B27 and electromagnet 4 A28.

[0058] The following will be combined with the Figure 4 、 5 , 6, clearly and completely describe the three injection modes in this embodiment.

[0059] Methanol fuel injection mode: Figure 4As shown, when electromagnet B10 of the control valve controlling methanol fuel line 101 is energized to generate magnetic force, electromagnet A5 is de-energized, attracting coil B9, thereby moving plunger 8 downward and aligning oil hole A30 on plunger 8 with methanol fuel line 101, thus unblocking methanol fuel line 101. Electromagnet A19 of the control valve controlling diesel fuel line 102 generates magnetic force, attracting coil A20, thereby moving plunger 24 upward, dislocating oil hole A31 on plunger 24 from pressure control fuel line 23 and aligning oil hole B32 on plunger 24 with diesel fuel line 102, thus interrupting diesel fuel line 102. Furthermore, magnet A2 is energized to generate magnetic force attracting coil A3, thereby opening ball valve 17, reducing the fuel pressure in pressure control chamber 7 and returning fuel through oil drain hole 21, ball valve 17, oil return chamber 16, and oil return channel 1. At the same time, electromagnet 4A28 at the upper end of needle valve 12 generates a magnetic force that attracts coil 4A11 wrapped around the needle valve, controlling the lift of needle valve 12. Methanol flows through methanol oil circuit 101 and premix pressure chamber 13 before being ejected through injection port 14. Furthermore, electromagnet 3B27 is energized to generate a magnetic force that attracts coil 3A3, thereby closing ball valve 17. Diesel fuel enters pressure control chamber 7 through pressure control oil circuit 23 and oil inlet 22, boosting the diesel fuel in pressure control chamber 7 and balancing the oil pressure at the upper and lower ends of needle valve 17. Simultaneously, electromagnet 4A28 at the upper end of needle valve 17 is de-energized, and the needle valve 17's own gravity closes injection port 14, concluding injection.

[0060] Diesel fuel injection mode: Figure 5As shown, when electromagnet A5 of the control valve controlling methanol oil circuit 101 is energized to generate magnetic force, electromagnet B10 is de-energized, attracting coil A6, thereby moving plunger 8 upward, misaligning oil hole A30 on plunger 8 with methanol oil circuit 101 and interrupting methanol oil circuit 101. Electromagnet B19 of the control valve controlling diesel oil circuit 102 generates magnetic force, attracting coil B25, thereby moving plunger 24 downward, aligning oil hole A31 on the plunger with pressure control oil circuit 23 and oil hole B32 on the plunger with diesel oil circuit 102, thus unblocking diesel oil circuit 102. Furthermore, magnet A2 is energized to generate magnetic force attracting coil A3, thereby opening ball valve 17, reducing the fuel pressure in pressure control chamber 7 and allowing oil to return through oil drain hole 21, ball valve 17, oil return chamber 16, and oil return channel 1. At the same time, electromagnet 4A28 at the upper end of needle valve 12 generates a magnetic force that attracts coil 4A11 wrapped around the needle valve, controlling the lift of needle valve 12. Diesel fuel flows through diesel oil circuit 102 and premix pressure chamber 13 before being ejected through injection port 14. Furthermore, electromagnet 3B27 is energized to generate a magnetic force that attracts coil 3A3, thereby closing ball valve 17. Diesel fuel flows into pressure control chamber 7 through pressure control oil circuit 23 and oil inlet 22, increasing the pressure of the diesel fuel in pressure control chamber 7 and balancing the oil pressure at the upper and lower ends of needle valve 17. Simultaneously, electromagnet 4A28 at the upper end of needle valve 17 is de-energized, and the gravity of needle valve 17 cooperates to close injection port 14, concluding injection.

[0061] Methanol-diesel dual fuel internal mixing injection mode: Figure 6As shown, when electromagnet B10, which controls the control valve for methanol fuel line 101, is energized to generate magnetic force, electromagnet A5 is de-energized, attracting coil B9, which in turn moves plunger 8 downward, aligning oil hole A30 on plunger 8 with methanol fuel line 101 and unblocking it. Electromagnet B19, which controls the control valve for diesel fuel line 102, generates magnetic force, attracting coil B25, which in turn moves plunger 24 downward, aligning oil hole A31 on plunger 24 with pressure control fuel line 23 and oil hole B32 on plunger 24 with diesel fuel line 102, unblocking diesel fuel line 102. Furthermore, magnet A2 is energized to generate magnetic force, attracting coil A3, which opens ball valve 17, reducing the fuel pressure in pressure control chamber 7 and allowing oil to return through oil drain hole 21, ball valve 17, oil return chamber 16, and oil return channel 1. At the same time, the electromagnet 4A28 at the upper end of the needle valve 12 generates a magnetic force to attract the coil 4A11 wrapped around the needle valve, controlling the needle valve 12 to lift. Methanol and diesel are mixed in the premix pressure chamber 13 through the methanol oil circuit 101 and the diesel oil circuit 102, respectively, and then sprayed out through the injection hole 14. Further, the electromagnet 3B27 is energized to generate a magnetic force to attract the coil 3A3, thereby closing the ball valve 17. Diesel fuel enters the pressure control chamber 7 through the pressure control oil circuit 23 and the oil inlet 22, thereby increasing the pressure of the diesel fuel in the pressure control chamber 7 and balancing the oil pressure at the upper and lower ends of the needle valve 17. At the same time, the electromagnet 4A28 at the upper end of the needle valve 17 is de-energized, and the needle valve 17's own gravity closes the injection hole 14, and the injection ends.

[0062] The above further describes the technical solution provided by the present invention in detail through several specific embodiments in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the several specific embodiments described above are not intended to limit the present invention. Any reasonable modification and improvement of the present invention, combination of embodiments and equivalent replacement based on the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A methanol-diesel dual-fuel internal mixing injector with independent control, comprising: An injector housing, wherein the injector housing is provided with a methanol fuel inlet, a diesel fuel inlet, an injection hole, and methanol fuel lines and diesel fuel lines connected thereto; It is characterized in that the injector is equipped with a methanol control component, a diesel control component, a pressure control chamber, a ball valve, a needle valve and a premixing pressure chamber, which can control the injection of methanol and diesel respectively and realize the mixed injection of the two fuels in the premixing pressure chamber.

2. The methanol-diesel dual-fuel independently controllable internal mixing injector according to claim 1, characterized in that: The methanol control component includes a plunger 1 and an oil hole 1A arranged on the methanol oil line, and an electromagnet 1A and an electromagnet 1B for driving the plunger 1 to move up and down.

3. The methanol-diesel dual-fuel independently controllable internal mixing injector according to claim 1, characterized in that: The diesel control component includes a plunger 2 and oil holes 2A and 2B arranged on the diesel oil circuit, as well as electromagnets 2A and 2B for driving the plunger 2 to move up and down.

4. The methanol-diesel dual-fuel independently controllable internal mixing injector according to claim 1, characterized in that: The pressure control chamber is connected to the pressure control oil circuit through the oil inlet hole, and is used to push the needle valve to close the oil injection hole under high pressure.

5. The methanol-diesel dual-fuel independently controllable internal mixing injector according to claim 1, characterized in that: The ball valve is set between the pressure control chamber and the oil return chamber, and is controlled to open or close by electromagnet 3A and electromagnet 3B to adjust the pressure relief state of the pressure control chamber.

6. The methanol-diesel dual-fuel independently controllable internal mixing injector according to claim 1, characterized in that: The premixing pressure chamber is arranged below the needle valve and is connected to the methanol oil circuit and the diesel oil circuit, and is used to mix the two fuels before injection.

7. A method for controlling a methanol-diesel dual-fuel internal mixing injector that can be independently controlled, characterized in that: Used to control the fuel injector according to claim 1, comprising: a step of controlling an open or closed state of a methanol passage and a diesel passage according to an injection mode; In methanol injection mode, the methanol oil circuit is opened, and the diesel oil circuit and pressure control oil circuit are closed; In diesel injection mode, the diesel oil circuit and the pressure control oil circuit are opened, and the methanol oil circuit is closed; In dual fuel injection mode, the methanol oil circuit, diesel oil circuit and pressure control oil circuit are opened at the same time; During the injection start-up phase, the ball valve is opened to release the oil pressure in the pressure control chamber, and the needle valve is pulled up to complete the injection; At the end of injection, the ball valve is closed to restore the oil pressure, and the needle valve control is disconnected to reset it and close the injection hole.

8. A computer storage medium for storing a computer program, characterized in that When the computer program is read by a computer, the computer executes the method according to claim 7 .

9. A computer comprising a processor and a storage medium, characterized in that When the processor reads the computer program stored in the storage medium, the computer executes the method according to claim 7 .

10. A computer program product, being a computer program, characterized in that When the computer program is executed, the method according to claim 7 is implemented.

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