Dual-fuel supply system, engine and mechanical equipment

Abstract

The invention discloses a dual-fuel supply system, an engine and mechanical equipment, and relates to the technical field of engines. The first end of the dual-fuel high-pressure oil pump module is connected with the first ends of the first and second fuel conveying modules, and the third end of the dual-fuel high-pressure oil pump module is connected with the second ends of the first and second fuel conveying modules; the first end of the dual-fuel high-pressure oil rail module is connected with the second end of the dual-fuel high-pressure oil pump module, and the third end is connected with the second ends of the first and second fuel conveying modules respectively; the first end of the dual-fuel direct injection module is connected with the second end of the dual-fuel high-pressure oil rail module, and the second end of the dual-fuel direct injection module is connected with the second end of the first fuel conveying module; and the dual-fuel supply controller is connected with the fourth end of the dual-fuel high-pressure oil pump module, the fourth end of the dual-fuel high-pressure oil rail module and the third end of the dual-fuel direct injection module, collects rail pressure information and controls the supply of the first fuel and / or the supply of the second fuel. The implementation cost of the dual-fuel supply system is reduced.

Description

[0001] Statement regarding priority reference: This application claims priority to the patent filed on May 14, 2025, with application number 202510620983.7 and application title "Dual-fuel supply system, engine and vehicle", the contents of which are incorporated herein by reference in part. Technical Field

[0002] This application relates to the field of engine technology, and in particular to a dual-fuel supply system, engine, and mechanical equipment. Background Technology

[0003] With the continuous development of engines, users have also put forward higher requirements for the structural design of fuel supply in engines, especially the structural design of dual fuel supply systems.

[0004] The traditional dual-fuel supply system is designed with two independent supply systems for each fuel. This design has certain drawbacks, as it requires two separate supply systems, which leads to high implementation costs.

[0005] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The main objective of this application is to provide a dual-fuel supply system, engine, and mechanical equipment, aiming to solve the technical problem of high implementation cost of dual-fuel supply systems.

[0007] To achieve the above objectives, this application provides a dual-fuel supply system, the dual-fuel supply system comprising: First fuel delivery module and second fuel delivery module; A dual-fuel high-pressure oil pump module, wherein the first end of the dual-fuel high-pressure oil pump module is connected to the first end of the first fuel delivery module and the first end of the second fuel delivery module, respectively, and the third end of the dual-fuel high-pressure oil pump module is connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module, respectively. A dual-fuel high-pressure fuel rail module, wherein the first end of the dual-fuel high-pressure fuel rail module is connected to the second end of the dual-fuel high-pressure fuel pump module, and the third end of the dual-fuel high-pressure fuel rail module is connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module, respectively. A dual-fuel direct injection module, wherein the first end of the dual-fuel direct injection module is connected to the second end of the dual-fuel high-pressure oil rail module, and the second end of the dual-fuel direct injection module is connected to the second end of the first fuel delivery module; A dual-fuel supply controller is connected to the fourth terminal of the dual-fuel high-pressure oil pump module, the fourth terminal of the dual-fuel high-pressure oil rail module, and the third terminal of the dual-fuel direct injection module. The dual-fuel supply controller is used to collect the rail pressure information of the dual-fuel high-pressure oil rail module and control the dual-fuel high-pressure oil pump module based on the rail pressure information, so that the first fuel delivery module supplies the first fuel and / or the second fuel delivery module supplies the second fuel.

[0008] In one embodiment, the dual-fuel supply controller includes a first direct injection control terminal and a second direct injection control terminal, the second terminal of the dual-fuel high-pressure fuel rail module includes a first fuel rail output port and a second fuel rail output port, and the dual-fuel direct injection module includes: A high-pressure oil pipe adapter, wherein the adapter input port of the high-pressure oil pipe adapter is connected to the first fuel rail output port via an oil outlet pipe; The first direct injection injector has its first direct injection input port connected to the first conversion output port of the high-pressure oil pipe adapter via an oil outlet pipe, and its first direct injection output port connected to the second end of the first fuel delivery module via a return oil pipe, and its first control valve connected to the first direct injection control end via a control line. The second direct injection injector has its second direct injection inlet connected to the second adapter outlet of the high-pressure fuel line adapter via an outlet pipe. The third direct injection inlet of the second direct injection injector is connected to the second fuel rail outlet via an outlet pipe. The second direct injection outlet of the second direct injection injector is connected to the second end of the first fuel delivery module via a return pipe. The second control valve on the second direct injection injector is connected to the second direct injection control end via a control line.

[0009] In one embodiment, the dual-fuel supply controller includes an integrated direct injection control terminal, the second terminal of the dual-fuel high-pressure fuel rail module includes a first fuel rail output port and a second fuel rail output port, and the dual-fuel direct injection module includes: An integrated direct injection injector is provided, wherein the first direct injection inlet of the integrated direct injection injector is connected to the first fuel rail outlet via an outlet pipe, the second direct injection inlet of the integrated direct injection injector is connected to the second fuel rail outlet via an outlet pipe, the first direct injection outlet of the integrated direct injection injector is connected to the second end of the first fuel delivery module via a return pipe, and the first control valve on the integrated direct injection injector is connected to the integrated direct injection control end via a control line. The integrated control valve can independently control the injection of the first fuel and the second fuel, and the injection outlet of the integrated direct injection injector is located at the center of the combustion chamber.

[0010] In one embodiment, a first needle valve and a second needle valve are coaxially disposed within the integrated direct injection injector. The first needle valve is disposed inside the second needle valve. The first needle valve is configured to control the first fuel injection, and the second needle valve is configured to control the second fuel injection.

[0011] In one embodiment, the dual-fuel supply controller includes a first rail pressure acquisition terminal, the second terminal of the dual-fuel high-pressure oil pump module includes a first oil pump output port, and the dual-fuel high-pressure oil rail module includes: The first fuel rail has a first oil rail inlet connected to the first oil pump outlet via an oil outlet pipe, and a first oil rail outlet connected to the second end of the first fuel delivery module via a return oil pipe. The second oil rail outlet of the first fuel rail serves as the first fuel rail outlet. The first rail pressure sensor is installed on the first fuel oil rail and is connected to the first rail pressure acquisition terminal via a communication line. A mechanical pressure relief valve is installed at the output port of the first oil rail.

[0012] In one embodiment, the dual-fuel supply controller includes a second rail pressure acquisition terminal and a first pressure control terminal; the second terminal of the dual-fuel high-pressure oil pump module includes a second oil pump output port; and the dual-fuel high-pressure oil rail module includes: The second fuel rail has a second fuel rail inlet and a second fuel pump outlet connected by an outlet pipe. The third fuel rail outlet is connected to the second end of the second fuel delivery module by a return pipe. The fourth fuel rail outlet serves as the second fuel rail outlet. The second rail pressure sensor is installed on the second fuel oil rail and is connected to the second rail pressure acquisition terminal via a communication line. The first pressure control valve is located at the output port of the third oil rail and is connected to the first pressure control terminal via a control line.

[0013] In one embodiment, the dual-fuel supply controller includes a first metering control terminal and a second metering control terminal, and the dual-fuel high-pressure oil pump module includes: A dual-fuel high-pressure oil pump, wherein the first oil pump inlet of the dual-fuel high-pressure oil pump is connected to the first end of the first fuel delivery module via an oil outlet pipe, the second oil pump inlet of the dual-fuel high-pressure oil pump is connected to the first end of the second fuel delivery module via an oil outlet pipe, the first oil pump outlet of the dual-fuel high-pressure oil pump serves as the first oil pump outlet of the dual-fuel high-pressure oil pump module, the second oil pump outlet of the dual-fuel high-pressure oil pump serves as the second oil pump outlet of the dual-fuel high-pressure oil pump module, the third oil pump outlet of the dual-fuel high-pressure oil pump is connected to the first end of the first fuel delivery module via a return oil pipe, and the fourth oil pump outlet of the dual-fuel high-pressure oil pump is connected to the first end of the second fuel delivery module via a return oil pipe; The first metering device is installed at the input port of the first oil pump and is connected to the first metering control terminal via a control line. The second meter is located at the inlet of the second oil pump and is connected to the second metering control terminal via a control line.

[0014] In one embodiment, the first fuel delivery module includes: The first fuel tank, the first return port of the first fuel tank is connected to the output port of the third fuel pump, the first fuel rail output port in the dual-fuel high-pressure fuel rail module and the first direct injection output port in the dual-fuel direct injection module through a return pipe; The first coarse filter, wherein the first coarse filter inlet of the first coarse filter is connected to the first oil outlet of the first fuel tank via an oil outlet pipe; The first oil pump is connected to the first coarse filter outlet of the first coarse filter via an oil outlet pipe. The first fine filter has its first fine filter inlet connected to the first oil outlet of the first oil pump via an oil outlet pipe, and its first fine filter outlet connected to the input port of the first oil pump via an oil outlet pipe.

[0015] In one embodiment, the second fuel delivery module includes: The second fuel tank, the second return port of the second fuel tank is connected to the output port of the fourth oil pump and the fourth oil rail output port in the dual-fuel high-pressure oil rail module through a return pipe; The second coarse filter, the second coarse filter inlet of the second coarse filter is connected to the second oil outlet of the second fuel tank through an oil outlet pipe; The second oil pump is connected to the second coarse filter outlet of the second coarse filter via an oil outlet pipe. The second fine filter has its second fine filter inlet connected to the second oil outlet of the second oil pump via an oil outlet pipe, and its second fine filter outlet connected to the input port of the second oil pump via an oil outlet pipe.

[0016] In one embodiment, if the rail pressure difference between the first rail pressure value and the second rail pressure value in the rail pressure information is less than a preset rail pressure difference threshold, the first pressure control valve in the dual-fuel high-pressure oil rail module is controlled to depressurize the second fuel.

[0017] In addition, to achieve the above objectives, this application also provides an engine that includes the aforementioned dual-fuel supply system.

[0018] In addition, to achieve the above objectives, this application also provides a mechanical device, which includes the engine described above.

[0019] This application provides a dual-fuel supply system, including a first fuel delivery module and a second fuel delivery module; a dual-fuel high-pressure oil pump module, the first end of which is connected to the first end of both the first and second fuel delivery modules, and the third end of which is connected to the second end of both the first and second fuel delivery modules; a dual-fuel high-pressure oil rail module, the first end of which is connected to the second end of both the first and second fuel delivery modules, and the third end of which is connected to the second end of both the first and second fuel delivery modules; a dual-fuel direct injection module, the first end of which is connected to the second end of both the dual-fuel high-pressure oil pump module, and the second end of which is connected to the second end of both the first and second fuel delivery modules; and a dual-fuel supply controller, which is connected to the dual-fuel high-pressure oil rail module. The fourth terminal of the fuel pump module, the fourth terminal of the dual-fuel high-pressure fuel rail module, and the third terminal of the dual-fuel direct injection module are connected. The dual-fuel supply controller is used to collect the rail pressure information of the dual-fuel high-pressure fuel rail module and control the dual-fuel high-pressure fuel pump module based on the rail pressure information, so that the first fuel delivery module supplies the first fuel and / or the second fuel delivery module supplies the second fuel. This dual-fuel supply system reaches the dual-fuel supply controller through the first fuel delivery module and the second fuel delivery module in sequence via the dual-fuel high-pressure fuel pump module and the dual-fuel high-pressure fuel rail module to complete the supply of the first fuel and the second fuel. At the same time, the rail pressure information of the dual-fuel high-pressure fuel rail module is collected, and the dual-fuel high-pressure fuel pump module is controlled based on the rail pressure information, so that the first fuel delivery module supplies the first fuel and / or the second fuel delivery module supplies the second fuel. This can avoid the phenomenon that the dual-fuel supply system needs to use two independent supply systems to achieve fuel supply. This dual-fuel supply system delivers fuel to the dual-fuel supply controller via a first fuel delivery module and a second fuel delivery module, which then pass through a dual-fuel high-pressure oil pump module and a dual-fuel high-pressure oil rail module. This reduces the use of high-pressure oil pumps and high-pressure oil rails in the two independent systems, thereby lowering the implementation cost of the dual-fuel supply system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the framework of the first embodiment of the dual-fuel supply system of this application; Figure 2 This is a schematic diagram of a frame of the dual-fuel direct injection module in the dual-fuel supply system of this application; Figure 3 This is another schematic diagram of the dual-fuel direct injection module in the dual-fuel supply system of this application; Figure 4 This is a schematic diagram of the structure of the integrated direct injection injector in the dual-fuel supply system of this application; Figure 5This is a schematic diagram of an injection system with an integrated direct injection injector in the dual-fuel supply system of this application. Figure 6 This is a schematic diagram of a frame of the dual-fuel high-pressure oil rail module in the dual-fuel supply system of this application; Figure 7 This is a schematic diagram of a frame of the dual-fuel high-pressure oil pump module in the dual-fuel supply system of this application; Figure 8 This is a schematic diagram of the fuel delivery module in the dual-fuel supply system of this application. Figure 9 This is a physical connection diagram of the dual-fuel supply system of this application; Figure 10 This is another physical connection diagram of the dual-fuel supply system of this application.

[0021] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0022] Explanation of icon numbers: 10. First fuel delivery module; 20. Second fuel delivery module; 30. Dual-fuel high-pressure fuel pump module; 40. Dual-fuel high-pressure fuel rail module; 50. Dual-fuel direct injection module; 60 (ECM), dual-fuel supply controller; 61. First direct injection control terminal; 62. Second direct injection control terminal; 401. First fuel rail output port; 402. Second fuel rail output port; 51. High-pressure fuel line adapter; 52. First direct injection injector; 53. Second direct injection injector; 54. First control valve; 55. Second control valve; 64. First rail pressure acquisition terminal; 65. First pressure control terminal; 66. Second rail pressure acquisition terminal; 301. First fuel pump output port; 30 2. Second fuel pump output port; 41. First fuel rail; 42. First rail pressure sensor; 43. Mechanical pressure relief valve; 44. Second fuel rail; 45. Second rail pressure sensor; 46. First pressure control valve; 67. First metering control terminal; 68. Second metering control terminal; 31. Dual-fuel high-pressure fuel pump; 32. First metering device; 33. Second metering device; 11. First fuel tank; 12. First coarse filter; 13. First fuel pump; 14. First fine filter; 21. Second fuel tank; 22. Second coarse filter; 23. Second fuel pump; 24. Second fine filter; 63. Integrated direct injection control terminal; 56. Integrated direct injection injector; 57. Integrated control valve. Detailed Implementation

[0023] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0024] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Currently, commonly used secondary fuel engines (this application uses methanol as an example, but other secondary fuels with similar properties can also be used, and are not limited here) mainly employ intake manifold injection + spark plug ignition. This means that methanol is injected into the intake manifold and then ignited in the combustion chamber. However, due to the corrosive nature and high latent heat of vaporization of methanol, spark plug-ignition methanol engines generally suffer from cold start difficulties (i.e., due to the high latent heat of vaporization, it is difficult to form a sufficient air-fuel mixture during low-temperature starts, making ignition difficult), and cylinder wall wear (i.e., some methanol enters the combustion chamber from the intake manifold without vaporizing, resulting in liquid methanol...). The methanol-fueled engine suffers from several problems, including the erosion of cylinder liner inner surface oil by methanol, leading to decreased lubrication and accelerated cylinder liner wear. Furthermore, its thermal efficiency is limited by premixed combustion knock (in methanol port injection mode, methanol and air are fully mixed before ignition to form a mixture; when the spark plug ignites, the flame propagates from the ignition core to the combustion chamber; if the mixture far from the spark plug spontaneously combusts before the flame reaches it, the engine will knock, causing a sharp rise in cylinder pressure and severe engine vibration, seriously affecting engine performance and lifespan). Its power-to-displacement ratio (the maximum power produced per liter of displacement) is also lower than that of diesel engines. In dual-fuel methanol engine research, a methanol port injection premixed system combined with diesel direct injection ignition is commonly used. However, the methanol port injection premixed combustion mode is still affected by knock and combustion stability, resulting in a generally low methanol substitution rate. In addition, the existing dual-fuel supply system design uses two independent high-pressure supply systems for each fuel, leaving no space for the engine itself.

[0026] Therefore, based on the shortcomings of the above-mentioned dual-fuel supply systems, this application proposes a dual-fuel supply system. The main solution of this application's embodiments is as follows: the first fuel delivery module and the second fuel delivery module sequentially pass through the dual-fuel high-pressure oil pump module and the dual-fuel high-pressure oil rail module to reach the dual-fuel supply controller, thereby completing the supply of the first fuel and the second fuel. Simultaneously, the rail pressure information of the dual-fuel high-pressure oil rail module is collected, and the dual-fuel high-pressure oil pump module is controlled based on the rail pressure information, so that the first fuel delivery module supplies the first fuel and / or the second fuel delivery module supplies the second fuel. This avoids the need for two independent supply systems to achieve fuel supply in a dual-fuel supply system. This dual-fuel supply system, by having the first fuel delivery module and the second fuel delivery module sequentially pass through the dual-fuel high-pressure oil pump module and the dual-fuel high-pressure oil rail module to reach the dual-fuel supply controller, completes the supply of the first fuel and the second fuel, reducing the use of high-pressure oil pumps and high-pressure oil rails in two independent systems, thereby reducing the implementation cost of the dual-fuel supply system.

[0027] Based on this, embodiments of this application provide a dual-fuel supply system, referring to... Figure 1 , Figure 1This is a schematic diagram of the framework of the first embodiment of the dual-fuel supply system of this application.

[0028] Reference Figure 1 This application provides a dual-fuel supply system 100, which includes: First fuel delivery module 10 and second fuel delivery module 20; The dual-fuel high-pressure oil pump module 30 has its first end connected to the first end of the first fuel delivery module 10 and the first end of the second fuel delivery module 20, respectively, and its third end connected to the second end of the first fuel delivery module 10 and the second end of the second fuel delivery module 20, respectively. The dual-fuel high-pressure oil rail module 40 has its first end connected to the second end of the dual-fuel high-pressure oil pump module 30, and its third end connected to the second end of the first fuel delivery module 10 and the second end of the second fuel delivery module 20, respectively. The dual-fuel direct injection module 50 has its first end connected to the second end of the dual-fuel high-pressure oil rail module 40, and its second end connected to the second end of the first fuel delivery module 10. The dual-fuel supply controller 60 is connected to the fourth terminal of the dual-fuel high-pressure oil pump module 30, the fourth terminal of the dual-fuel high-pressure oil rail module 40, and the third terminal of the dual-fuel direct injection module 50. The dual-fuel supply controller 60 is used to collect the rail pressure information of the dual-fuel high-pressure oil rail module 40 and control the dual-fuel high-pressure oil rail module 40 based on the rail pressure information, so that the first fuel delivery module 10 supplies the first fuel and / or the second fuel delivery module 20 supplies the second fuel.

[0029] In this embodiment, the dual-fuel supply system 100 achieves integrated dual-fuel supply by designing a dual-fuel high-pressure fuel pump module 30 and a dual-fuel high-pressure fuel rail module 40. Specifically, the dual-fuel supply controller 60 collects the rail pressure information of the dual-fuel high-pressure fuel rail module 40, and then controls the dual-fuel high-pressure fuel rail module 40 based on this rail pressure information. This achieves the purpose of the first fuel delivery module 10 supplying the first fuel and / or controlling the second fuel delivery module 20 to supply the second fuel. The rail pressure information refers to the fuel rail pressure value collected by the dual-fuel high-pressure fuel rail module 40. Control is mainly based on the flow rate of the two fuels controlled by the dual-fuel high-pressure fuel rail module 40. The flow rate information refers to the fuel flow rate delivered from the first fuel delivery module 10 and the second fuel delivery module 20 to the dual-fuel high-pressure fuel pump module 30. If the engine operating condition determines that the required rail pressure value for fuel D is A, and the actual collected rail pressure value is B, and B is less than A, the flow rate of fuel D will be increased, thereby increasing the rail pressure value of fuel D to complete the dual-fuel supply control. Because the dual-fuel high-pressure fuel pump module 30 and the dual-fuel high-pressure fuel rail module 40 adopt an integrated design, the fuel pump drives the first fuel and the second fuel common rail system (but the two fuels are independently controlled and driven, and do not affect each other), meeting the engine's drive requirements, thereby reducing the implementation cost of the dual-fuel supply system. It is worth noting that if one of the fuels in the dual-fuel supply is corrosive, the other fuel can be used for hydraulic drive on the injector of that fuel to avoid corrosion damage to the control components. If the second fuel is corrosive, the first fuel (ignition fuel, such as diesel) can be used to drive the injector of the second fuel to avoid corrosion damage to the injector components of the second fuel (clean fuel, such as methanol), thereby improving the service life of the dual-fuel supply system.

[0030] It is worth noting that, in this application, the connection of the first end of the dual-fuel high-pressure oil pump module 30 to the first end of the first fuel delivery module 10 and the first end of the second fuel delivery module 20 respectively means that part A of the first end of the dual-fuel high-pressure oil pump module 30 is connected to the first end of the first fuel delivery module 10, and part B of the first end of the dual-fuel high-pressure oil pump module 30 is connected to the first end of the second fuel delivery module 20. Here, A and B do not belong to the same position. That is, the connection means that different parts of a certain position are connected to different modules respectively. The subsequent connection has the same meaning as above and is not limited here.

[0031] It is worth noting that the dual-fuel supply system 100 also includes the assembly design of cylinder liners, pistons and cylinder heads to form a combustion chamber, so that the fuel can be burned in the combustion chamber. Of course, the combustion chamber may also include other components, such as air inlets and outlets for air exchange between the combustion chamber and the outside, as well as opening or closing devices provided at the air inlets and outlets, etc., which will not be described in detail here. For special combustion chamber structures, the second direct injection injector in the dual-fuel direct injection module 50 can be designed to be installed at the center of the inner wall of the cylinder head, while the first direct injection injector in the dual-fuel direct injection module 50 is designed at a position on the inner wall of the cylinder head that is less than a preset first distance value from the center. The inner wall of the cylinder head is the side of the cylinder head that forms the combustion chamber. By designing the second direct injection injector in the middle position (at this time, the combustion chamber can use a W-shaped rotating chamber, which, together with the fuel jet arrangement of the second direct injection injector, optimizes the combustion process of the second fuel), the clean fuel in the second direct injection injector can be fully combusted. At the same time, the first direct injection injector is designed close to the second direct injection injector to ensure that the first direct injection injector can accurately increase the combustion space temperature of the clean fuel and ensure the ignition effect of the clean fuel.

[0032] In this embodiment, a dual-fuel supply system is provided, including a first fuel delivery module and a second fuel delivery module; a dual-fuel high-pressure oil pump module, the first end of which is connected to the first end of both the first fuel delivery module and the first end of both the second fuel delivery module, and the third end of which is connected to the second end of both the first fuel delivery module and the second end of both the second fuel delivery module; a dual-fuel high-pressure oil rail module, the first end of which is connected to the second end of both the dual-fuel high-pressure oil pump module, and the third end of which is connected to the second end of both the first fuel delivery module and the second end of both the second fuel delivery module; a dual-fuel direct injection module, the first end of which is connected to the second end of both the dual-fuel high-pressure oil rail module, and the second end of which is connected to the second end of both the first fuel delivery module; and a dual-fuel supply controller, which is connected to the dual-fuel high-pressure oil rail module. The fourth terminal of the high-pressure oil pump module, the fourth terminal of the dual-fuel high-pressure oil rail module, and the third terminal of the dual-fuel direct injection module are connected. The dual-fuel supply controller is used to collect the rail pressure information of the dual-fuel high-pressure oil rail module and control the dual-fuel high-pressure oil pump module based on the rail pressure information, so that the first fuel delivery module supplies the first fuel and / or the second fuel delivery module supplies the second fuel. This dual-fuel supply system reaches the dual-fuel supply controller through the first fuel delivery module and the second fuel delivery module in sequence via the dual-fuel high-pressure oil pump module and the dual-fuel high-pressure oil rail module to complete the supply of the first fuel and the second fuel. At the same time, the rail pressure information of the dual-fuel high-pressure oil rail module is collected, and the dual-fuel high-pressure oil pump module is controlled based on the rail pressure information, so that the first fuel delivery module supplies the first fuel and / or the second fuel delivery module supplies the second fuel. This can avoid the phenomenon that the dual-fuel supply system needs to use two independent supply systems to achieve fuel supply. This dual-fuel supply system delivers fuel to the dual-fuel supply controller via a first fuel delivery module and a second fuel delivery module, which then pass through a dual-fuel high-pressure oil pump module and a dual-fuel high-pressure oil rail module. This reduces the use of high-pressure oil pumps and high-pressure oil rails in the two independent systems, thereby lowering the implementation cost of the dual-fuel supply system.

[0033] Furthermore, based on the first embodiment of this application described above, a second embodiment of the dual-fuel supply system of this application is proposed, referring to... Figure 2 , Figure 2 This is a schematic diagram of a dual-fuel direct injection module in the dual-fuel supply system of this application. The dual-fuel supply controller 60 includes a first direct injection control terminal 61 and a second direct injection control terminal 62. The second terminal of the dual-fuel high-pressure fuel rail module 40 includes a first fuel rail output port 401 and a second fuel rail output port 402. The dual-fuel direct injection module 50 includes: The high-pressure oil pipe adapter 51 is connected to the first fuel oil rail output port 401 via an oil outlet pipe. The first direct injection injector 52 (a commonly used direct injection injector) is connected to the first direct injection input port of the first direct injection injector 52 and the first conversion output port of the high-pressure oil pipe adapter 51 through an oil outlet pipe. The first direct injection output port of the first direct injection injector 52 is connected to the second end of the first fuel delivery module 10 through a return oil pipe. The first control valve 54 on the first direct injection injector 52 is connected to the first direct injection control terminal 61 through a control line. The second direct injection injector 53 (a commonly used direct injection injector) has its second direct injection inlet connected to the second adapter outlet of the high-pressure fuel line adapter 51 via an outlet pipe. The third direct injection inlet of the second direct injection injector 53 is connected to the second fuel rail outlet 402 via an outlet pipe. The second direct injection outlet of the second direct injection injector 53 is connected to the second end of the first fuel delivery module 10 via a return pipe. The second control valve 55 on the second direct injection injector 53 is connected to the second direct injection control terminal 62 via a control line.

[0034] In this embodiment, the dual-fuel direct injection module 50 includes a high-pressure fuel line adapter 51, wherein the high-pressure fuel line adapter 51 is connected by a high-pressure fuel line to a first direct injection injector 52 (generally an injector for igniting fuel) and a second direct injection injector 53 (generally an injector for clean fuel) to output the first fuel and the second fuel. The design of the high-pressure fuel line adapter 51 can reduce the number of high-pressure interfaces on the dual-fuel high-pressure fuel rail module 40 and simplify the high-pressure pipeline connection. At this time, the high-pressure fuel output from the first fuel rail output port 401 and the second fuel rail output port 402 is connected by a high-pressure fuel line to the first direct injection injector 52 and the second direct injection injector 53. Then, the first control valve 54 and the second control valve 55 on the two injectors are controlled by the first direct injection control terminal 61 and the second direct injection control terminal 62 to achieve direct injection control. Its control principle can be as follows: The engine ECM (Engine Control Module) independently controls the injection parameters, including injection pressure, injection initiation angle, and injection quantity, which are the relevant parameters of the fuel output to the fuel jet. The above parameters can be adaptively controlled based on the engine operating conditions. The engine operating conditions include at least engine speed, engine torque, engine coolant temperature, and intake air temperature. The injection parameters (including the first fuel injection parameter and the second fuel injection parameter) corresponding to the above operating conditions are determined in the corresponding parameter table based on the above four operating conditions. The dual-fuel direct injection module 50 is then controlled based on its respective parameters. It is worth noting that, in addition to parameter control, there is also control over the direct injection time. The first direct injection injector 52 in the dual-fuel direct injection module 50 starts injecting before the engine top dead center. After the first direct injection injector 52 injects, the fuel jet atomizes and diffuses, mixes with the surrounding air and burns, increasing the overall temperature in the combustion chamber. At this time, the injection start time of the second direct injection injector 53 in the dual-fuel direct injection module 50 is later than that of the first direct injection injector 52. At the injection moment, the overall temperature in the cylinder is already higher than the auto-ignition temperature of the second fuel. The second fuel adopts a diffusion combustion mode, and the fuel jet mixes with the surrounding air and burns at the same time, avoiding a large amount of second fuel evaporation and heat absorption that would cause the cylinder temperature to drop. During cold start, the proportion of the first fuel can be increased to optimize cold start performance.

[0035] It is worth noting that since both the first direct injection injector 52 and the second direct injection injector 53 are driven by the first fuel, both injectors 52 and 53 return the fuel used for driving to the first fuel delivery module 10 through a return oil pipe to ensure fuel recycling. Furthermore, the nozzles of the first direct injection injector 52 and the second direct injection injector 53 are arranged in a predetermined spatial position, and the fuel jets are injected from the nozzles. The two types of fuel jets are spatially staggered to prevent the fuel injected later from affecting the flame of the fuel injected earlier (e.g., being directly extinguished), thus ensuring normal combustion driven by the dual fuel supply.

[0036] Furthermore, based on the first and / or second embodiments of this application described above, a third embodiment of the dual-fuel supply system of this application is proposed, referring to... Figure 3 , Figure 3 This is another schematic diagram of the dual-fuel direct injection module in the dual-fuel supply system of this application. The dual-fuel supply controller 60 includes an integrated direct injection control terminal 63, the second terminal of the dual-fuel high-pressure fuel rail module 40 includes a first fuel rail output port 401 and a second fuel rail output port 402, and the dual-fuel direct injection module 50 includes: The integrated direct injection injector 56 has its first direct injection inlet connected to the first fuel rail outlet 401 via an outlet pipe, its second direct injection inlet connected to the second fuel rail outlet 402 via an outlet pipe, and its first direct injection outlet connected to the second end of the first fuel delivery module 10 via a return pipe. The integrated control valve 55 on the integrated direct injection injector 56 is connected to the integrated direct injection control terminal 63 via a control line. The integrated control valve 55 can independently control the injection of the first fuel and the second fuel. The injection outlet of the integrated direct injection injector 56 is located at the center of the combustion chamber.

[0037] Furthermore, a first needle valve and a second needle valve are coaxially arranged inside the integrated direct injection injector 56. The first needle valve is located inside the second needle valve. The first needle valve is configured to control the first fuel injection, and the second needle valve is configured to control the second fuel injection.

[0038] In this embodiment, the dual-fuel direct injection module 50 includes an integrated direct injection injector 56 capable of injecting a first fuel and a second fuel. In this case, the integrated direct injection injector 56 can directly receive fuel from the first fuel rail output port 401 and the second fuel rail output port 402, and then achieve the injection of the first fuel or the second fuel through the control of the integrated control valve 55. For example, refer to... Figure 4 , Figure 4 This is a schematic diagram of an integrated direct injection injector in the dual-fuel supply system of this application. The integrated direct injection injector 56 has one outlet and two inlets. Taking diesel as the first fuel and methanol as the second fuel, diesel is injected as both an ignition fuel and the driving fluid for the entire integrated direct injection injector 56. This means the diesel also needs to return through the outlet. Because of the single integrated direct injection injector 56 design, it can be positioned in the center of the combustion chamber, eliminating the need for a diagonally positioned first direct injection injector. This significantly reduces the overall design complexity while ensuring the correct diesel injection volume, avoiding the issue of a smaller injection volume due to diagonal positioning. Further details can be found in... Figure 5 , Figure 5This is a schematic diagram of an integrated direct injection injector in the dual-fuel supply system of this application. A first needle valve and a second needle valve are coaxially arranged within the integrated direct injection injector 56. The first needle valve is located inside the second needle valve. The principle of the integrated direct injection injector 56 is that driving the first needle valve achieves the first fuel injection, and driving the second needle valve achieves the second fuel injection. Both needle valves are hydraulically driven using diesel fuel. The principle is that driving the needle valves to move them propels fuel through the outlet. The needle valves act as a stopper blocking the outlet. For example, because the first and second needle valves are coaxially arranged, and the first needle valve is located inside the second needle valve, the diesel needle valve in the middle can be cooled during methanol injection to prevent overheating and ensure the safety of the entire control system.

[0039] In one embodiment, based on the first, second, and / or third embodiments of this application described above, a fourth embodiment of the dual-fuel supply system of this application is proposed, referring to... Figure 6 , Figure 6 This is a schematic diagram of a dual-fuel high-pressure fuel rail module in the dual-fuel supply system of this application. The dual-fuel supply controller 60 includes a first rail pressure acquisition terminal 64, the second end of the dual-fuel high-pressure fuel pump module 30 includes a first fuel pump output port 301, and the dual-fuel high-pressure fuel rail module 40 includes: The first fuel rail 41 has a first oil rail inlet connected to the first oil pump outlet 301 via an oil outlet pipe, and a first oil rail outlet connected to the second end of the first fuel delivery module 10 via a return oil pipe. The second oil rail outlet of the first fuel rail 41 serves as the first fuel rail outlet 401. The first rail pressure sensor 42 is installed on the first fuel oil rail 41 and is connected to the first rail pressure acquisition terminal 64 via a communication line. Mechanical pressure relief valve 43 is installed at the output port of the first oil rail.

[0040] In one embodiment, the dual-fuel supply controller 60 includes a second rail pressure acquisition terminal 66 and a first pressure control terminal 65; the second terminal of the dual-fuel high-pressure oil pump module 30 includes a second oil pump output port 302; and the dual-fuel high-pressure oil rail module 40 includes: The second fuel rail 44 has a second oil rail inlet connected to the second oil pump outlet 302 via an oil outlet pipe, a third oil rail outlet connected to the second end of the second fuel delivery module 20 via a return oil pipe, and a fourth oil rail outlet serving as the second fuel rail outlet 402. The second rail pressure sensor 45 is installed on the second fuel oil rail 44, and the second rail pressure sensor 45 is connected to the second rail pressure acquisition terminal 66 via a communication line. The first pressure control valve 46 is located at the output port of the third oil rail and is connected to the first pressure control terminal 65 via a control line.

[0041] In this embodiment, the dual-fuel high-pressure fuel rail module 40 includes a first fuel rail 41 and a second fuel rail 44 for transferring the first fuel and the second fuel. Since the second fuel is required in larger quantities, two or more fuel outlet pipes can be connected between the second fuel rail 44 and the second fuel pump output port 302 to ensure the normal use of the second fuel. Furthermore, a first rail pressure sensor 42 is designed on the first fuel rail 41 to collect the rail pressure of the first fuel rail 41, thereby determining whether the first fuel needs to be controlled by the dual-fuel high-pressure fuel pump module (i.e., increasing the flow rate of the first fuel) when the rail pressure is lower than the required rail pressure. A mechanical pressure relief valve 43 will also be installed at the first fuel rail output port. The main function of the mechanical pressure relief valve 43 is to reduce the pressure of the first fuel rail 41 when the pressure is too high (directly controlled mechanically). For example, the mechanical pressure relief valve 43 can be controlled to return the first fuel to the first fuel delivery module 10 from the first fuel rail output port of the first fuel rail 41, so as to reduce the pressure of the first fuel rail 41. The first direct injection injector 52 and the first fuel rail output port of the first fuel rail 41 can realize the return of the first fuel, which flows back to the first fuel delivery module 10 through the low-pressure oil pipe. On the other hand, a second rail pressure sensor 45 will also be designed on the second fuel rail 44 to collect the rail pressure of the second fuel rail 44, so as to determine whether the second fuel needs to be controlled by the dual-fuel high-pressure oil pump module (i.e., increase the flow rate of the second fuel) when it is lower than the required rail pressure. A first pressure control valve 46, such as a PVC (Pressure Control Valve), is also installed at the third fuel rail output port. The main function of the first pressure control valve 46 is to reduce the pressure of the second fuel rail 44 when the pressure is too high, controlled by the first pressure control terminal 65. For example, the first pressure control valve 46 can be controlled to return the second fuel to the second fuel delivery module 20 from the third fuel rail output port of the second fuel rail 44, thereby reducing the pressure of the second fuel rail 44. The dual-fuel high-pressure oil pump 31 and the third fuel rail output port of the second fuel rail 44 can achieve the return of the second fuel, which flows back to the second fuel delivery module 20 through the low-pressure oil pipe. This completes the control of the rail pressure of the first and second fuels, ensuring the normal supply of the first and second fuels.

[0042] Based on the first, second, third, and / or fourth embodiments of this application described above, a fifth embodiment of the dual-fuel supply system of this application is proposed, with reference to... Figure 7 , Figure 7 This is a schematic diagram of a dual-fuel high-pressure oil pump module in the dual-fuel supply system of this application. The dual-fuel supply controller 60 includes a first metering control terminal 67 and a second metering control terminal 68. The dual-fuel high-pressure oil pump module 30 includes: The dual-fuel high-pressure oil pump 31 has a first oil pump inlet connected to the first end of the first fuel delivery module 10 via an oil outlet pipe, a second oil pump inlet connected to the first end of the second fuel delivery module 20 via an oil outlet pipe, a first oil pump outlet serving as the first oil pump outlet 301 of the dual-fuel high-pressure oil pump module 30, a second oil pump outlet serving as the second oil pump outlet 302 of the dual-fuel high-pressure oil pump module 30, a third oil pump outlet connected to the first end of the first fuel delivery module 10 via a return oil pipe, and a fourth oil pump outlet connected to the first end of the second fuel delivery module 20 via a return oil pipe. The first metering device 32 is located at the inlet of the first oil pump and is connected to the first metering control terminal 67 via a control line. The second metering device 33 is located at the inlet of the second oil pump and is connected to the second metering control terminal 68 via a control line.

[0043] In this embodiment, the dual-fuel high-pressure oil pump module 30 includes a dual-fuel high-pressure oil pump 31. The dual-fuel high-pressure oil pump 31 can achieve high-pressure processing of the first fuel and the second fuel. That is, the low-pressure first fuel and the second fuel are pressurized by the dual-fuel high-pressure oil pump 31 and pumped to the first fuel rail 41 and the second fuel rail 44 in the dual-fuel high-pressure oil rail module 40, respectively. At the same time, the first fuel and the second fuel can also return through the third oil pump output port and the fourth oil pump output port, respectively. Thus, high-pressure processing of the two fuels can be achieved by a single dual-fuel high-pressure oil pump 31, thereby reducing the implementation cost of the dual-fuel system. In order to achieve supply control of the two fuels, a first meter 32 is set at the first oil pump input port and a second meter 33 is set at the second oil pump input port. Of course, they can also be set at the inlet and outlet ports of the first fuel and the second fuel to achieve fuel flow control (the function of the fuel metering unit on the oil pump is to control the fuel flow). This allows for subsequent supply control based on the flow rate and the collected rail pressure value. If the rail pressure is low, the flow rate can be appropriately increased to meet the required rail pressure, thereby ensuring the normal supply of dual fuels.

[0044] Based on the first, second, third, fourth, and / or fifth embodiments of this application described above, a sixth embodiment of the dual-fuel supply system of this application is proposed, with reference to... Figure 8 , Figure 8 This is a schematic diagram of a fuel delivery module in the dual-fuel supply system of this application. The first fuel delivery module 10 includes: The first fuel tank 11, the first return oil port of the first fuel tank 11, the third oil pump output port, the first oil rail output port in the dual-fuel high-pressure oil rail module 40 and the first direct injection output port in the dual-fuel direct injection module 50 are connected by a return oil pipe. The first coarse filter 12 is connected to the first oil outlet of the first fuel tank 11 via an oil outlet pipe (generally defined as the oil outlet pipe after passing through the dual-fuel high-pressure oil pump 31 is a high-pressure oil pipe). The first oil pump 13 is connected to the first oil inlet of the first oil pump 13 and the first coarse filter outlet of the first coarse filter 12 via an oil outlet pipe. The first fine filter 14 is connected to the first oil outlet of the first oil pump 13 via an oil outlet pipe, and the first fine filter outlet of the first fine filter 14 is connected to the first oil pump inlet via an oil outlet pipe.

[0045] In one embodiment, the second fuel delivery module 20 includes: The second fuel tank 21, the second oil return port of the second fuel tank 21 is connected to the fourth oil pump output port and the fourth oil rail output port in the dual-fuel high-pressure oil rail module 40 through an oil return pipe; The second coarse filter 22 is connected to the second oil outlet of the second fuel tank 21 via an oil outlet pipe. The second oil pump 23 is connected to the second oil inlet of the second oil pump 23 and the second coarse filter outlet of the second coarse filter 22 via an oil outlet pipe. The second fine filter 24 is connected to the second oil outlet of the second oil pump 23 via an oil outlet pipe, and the second fine filter outlet of the second fine filter 24 is connected to the input port of the second oil pump via an oil outlet pipe.

[0046] In this embodiment, low-pressure first fuel is drawn from the first fuel tank 11 by the first fuel pump 13, and transported through a low-pressure oil pipe via a first coarse filter 12, the first fuel pump 13, and a first fine filter 14 to the dual-fuel high-pressure oil pump 31; low-pressure second fuel is drawn from the second fuel tank 21 by the second fuel pump 23, and transported through a low-pressure oil pipe via a second coarse filter 22, the second fuel pump 23, and a second fine filter 24 to the dual-fuel high-pressure oil pump 31. Of course, to ensure the integration of the entire system, the second fuel pump 23 and the first fuel pump 13 can be integrated into the dual-fuel high-pressure oil pump 31 to improve the integration of the dual-fuel supply system and reduce the layout difficulty and complexity of the system. Further details can be found in... Figure 9 , Figure 9 This is a physical connection diagram of the dual-fuel supply system of this application. The diagram illustrates the fuel flow of the entire dual-fuel supply system (the straight lines marked with arrows in the diagram represent fuel pipes, including at least return and outlet pipes, and the outlet pipes include at least high-pressure and low-pressure outlet pipes), and the connection and control relationships between the engine control module (i.e., the dual-fuel supply controller) and each module (the non-straight lines without arrows in the diagram). It is worth noting that the second direct injection injector 53 is simultaneously connected to both high-pressure first fuel and high-pressure second fuel, using the first fuel for hydraulic drive to avoid corrosion damage to control components caused by the second fuel. Thus, dual-fuel supply can be achieved through the above dual-fuel supply system, eliminating the need for two independent systems and reducing the implementation cost of the dual-fuel supply system. In another embodiment, refer to... Figure 10 , Figure 10 This is another physical connection diagram of the dual-fuel supply system of this application. In this case, an integrated direct injection injector 56 can be used to inject the first fuel and the second fuel. This reduces the use of the high-pressure fuel line adapter 51, thereby reducing the complexity of the entire hardware connection. Moreover, an integrated direct injection injector 56 can reduce the design complexity of the entire system.

[0047] Based on the first, second, third, fourth, fifth and / or sixth embodiments of this application, a seventh embodiment of the dual-fuel supply system of this application is proposed. When the rail pressure difference between the first rail pressure value in the rail pressure information and the second rail pressure value in the rail pressure information is less than a preset rail pressure difference threshold, the first pressure control valve 46 in the dual-fuel high-pressure oil rail module 40 is controlled to depressurize the second fuel.

[0048] In this embodiment, because the dual-fuel supply controller 60 collects the first rail pressure value of the first fuel and the second rail pressure value of the second fuel in real time, it can determine the required rail pressure value based on parameters such as the current engine speed, torque, and temperature, and then realize flow measurement through their respective meters, thereby achieving supply control of the first and second fuels. That is, the first fuel rail pressure is controlled by the first meter 32 on the dual-fuel high-pressure oil pump 31 according to the ECM's set value under the current operating conditions, and is measured in real time by the first rail pressure sensor 42 on the first fuel rail 41 for closed-loop control. If the rail pressure value collected by the first rail pressure sensor 42 is low, operations such as increasing the first fuel flow rate are performed based on the rail pressure value collected by the first rail pressure sensor 42. The control of the second fuel is the same, and will not be repeated here. It is worth noting that, in order to achieve normal dual-fuel supply, the first fuel rail pressure needs to be set to always be higher than the second fuel rail pressure by a certain value (the specific pressure difference is adjusted according to the rail pressure) to prevent the second fuel from leaking back into the first fuel circuit through the second direct injection injector 53. At the same time, the first fuel is allowed to seep slightly into the needle valve end of the second direct injection injector 53 to lubricate the needle valve assembly, while preventing the second direct injection injector 53 from being damaged by the second fuel. In the supply control, a first rail pressure sensor 42 is installed on the first fuel rail 41. When the first fuel rail pressure is higher than the supply system's limit pressure (customizable), the mechanical pressure relief valve 43 opens, releasing the first fuel pressure to ensure the safety of the supply system. A second rail pressure sensor 45 is installed on the second fuel rail 44. When the actual pressure difference between the second fuel rail pressure and the first fuel rail pressure exceeds a set value (which can be 0), the second fuel rail pressure is adjusted through the first pressure control valve 46 (PCV valve) to prevent the second fuel from back-seeping and causing damage to the components. It is worth noting that when the system is shut down, the first fuel pressure drops faster than the second fuel rail pressure. The first pressure control valve 46 releases the pressure to prevent the second fuel from back-seeping into the first fuel circuit when the system is shut down (at this time, the second fuel will cause corrosion of the components, hence the above control). Of course, other control methods can also be used, which are not limited here.

[0049] Based on the above embodiments of the dual-fuel supply system, an engine is proposed, which includes the aforementioned dual-fuel supply system.

[0050] In this embodiment, the engine, via a first fuel delivery module and a second fuel delivery module, sequentially passes through a dual-fuel high-pressure fuel pump module and a dual-fuel high-pressure fuel rail module to reach the dual-fuel supply controller, thus supplying the first and second fuels. Simultaneously, the rail pressure information of the dual-fuel high-pressure fuel rail module is collected, and the dual-fuel high-pressure fuel pump module is controlled based on this information. This ensures that the first fuel delivery module supplies the first fuel and / or controls the second fuel delivery module to supply the second fuel. This avoids the need for two independent supply systems for fuel supply in a dual-fuel system. This dual-fuel supply system, by using a first fuel delivery module and a second fuel delivery module sequentially via a dual-fuel high-pressure fuel pump module and a dual-fuel high-pressure fuel rail module to reach the dual-fuel supply controller, reduces the use of high-pressure fuel pumps and high-pressure fuel rails in two independent systems, thereby reducing the implementation cost of the dual-fuel supply system.

[0051] Based on the above embodiments of the dual-fuel supply system, a mechanical device is proposed, which includes the aforementioned engine. It is worth noting that the mechanical device can be any equipment requiring an engine, such as a car, ship, mining machinery, excavator, or power generation equipment.

[0052] In this embodiment, the above-mentioned mechanical equipment, through the engine, the first fuel delivery module and the second fuel delivery module, sequentially reach the dual fuel supply controller via the dual fuel high-pressure oil pump module and the dual fuel high-pressure oil rail module, to complete the supply of the first fuel and the second fuel. This can reduce the use of high-pressure oil pumps and high-pressure oil rails in the two independent systems, thereby reducing the implementation cost of the dual fuel supply system.

[0053] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A dual-fuel supply system, characterized in that, The dual-fuel supply system includes: First fuel delivery module and second fuel delivery module; A dual-fuel high-pressure oil pump module, wherein the first end of the dual-fuel high-pressure oil pump module is connected to the first end of the first fuel delivery module and the first end of the second fuel delivery module, respectively, and the third end of the dual-fuel high-pressure oil pump module is connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module, respectively. A dual-fuel high-pressure fuel rail module, wherein the first end of the dual-fuel high-pressure fuel rail module is connected to the second end of the dual-fuel high-pressure fuel pump module, and the third end of the dual-fuel high-pressure fuel rail module is connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module, respectively. A dual-fuel direct injection module, wherein the first end of the dual-fuel direct injection module is connected to the second end of the dual-fuel high-pressure oil rail module, and the second end of the dual-fuel direct injection module is connected to the second end of the first fuel delivery module; A dual-fuel supply controller is connected to the fourth terminal of the dual-fuel high-pressure oil pump module, the fourth terminal of the dual-fuel high-pressure oil rail module, and the third terminal of the dual-fuel direct injection module. The dual-fuel supply controller is used to collect the rail pressure information of the dual-fuel high-pressure oil rail module and control the dual-fuel high-pressure oil pump module based on the rail pressure information, so that the first fuel delivery module supplies the first fuel and / or the second fuel delivery module supplies the second fuel.

2. The dual-fuel supply system as described in claim 1, characterized in that, The dual-fuel supply controller includes a first direct injection control terminal and a second direct injection control terminal. The second terminal of the dual-fuel high-pressure fuel rail module includes a first fuel rail output port and a second fuel rail output port. The dual-fuel direct injection module includes: A high-pressure oil pipe adapter, wherein the adapter input port of the high-pressure oil pipe adapter is connected to the first fuel rail output port via an oil outlet pipe; The first direct injection injector has its first direct injection input port connected to the first conversion output port of the high-pressure oil pipe adapter via an oil outlet pipe, and its first direct injection output port connected to the second end of the first fuel delivery module via a return oil pipe, and its first control valve connected to the first direct injection control end via a control line. The second direct injection injector has its second direct injection inlet connected to the second adapter outlet of the high-pressure fuel line adapter via an outlet pipe. The third direct injection inlet of the second direct injection injector is connected to the second fuel rail outlet via an outlet pipe. The second direct injection outlet of the second direct injection injector is connected to the second end of the first fuel delivery module via a return pipe. The second control valve on the second direct injection injector is connected to the second direct injection control end via a control line.

3. The dual-fuel supply system as described in claim 1, characterized in that, The dual-fuel supply controller includes an integrated direct injection control terminal, and the second terminal of the dual-fuel high-pressure fuel rail module includes a first fuel rail output port and a second fuel rail output port. The dual-fuel direct injection module includes: An integrated direct injection injector is provided, wherein the first direct injection inlet of the integrated direct injection injector is connected to the first fuel rail outlet via an outlet pipe, the second direct injection inlet of the integrated direct injection injector is connected to the second fuel rail outlet via an outlet pipe, the first direct injection outlet of the integrated direct injection injector is connected to the second end of the first fuel delivery module via a return pipe, and the integrated control valve on the integrated direct injection injector is connected to the integrated direct injection control end via a control line. The integrated control valve can independently control the injection of the first fuel and the second fuel, and the injection outlet of the integrated direct injection injector is located at the center of the combustion chamber.

4. The dual-fuel supply system as described in claim 3, characterized in that, The integrated direct injection injector is coaxially provided with a first needle valve and a second needle valve. The first needle valve is located inside the second needle valve. The first needle valve is configured to control the first fuel injection, and the second needle valve is configured to control the second fuel injection.

5. The dual-fuel supply system as described in claim 2, characterized in that, The dual-fuel supply controller includes a first rail pressure acquisition terminal, and the second terminal of the dual-fuel high-pressure oil pump module includes a first oil pump output port. The dual-fuel high-pressure oil rail module includes: The first fuel rail has a first oil rail inlet connected to the first oil pump outlet via an oil outlet pipe, and a first oil rail outlet connected to the second end of the first fuel delivery module via a return oil pipe. The second oil rail outlet of the first fuel rail serves as the first fuel rail outlet. The first rail pressure sensor is installed on the first fuel oil rail and is connected to the first rail pressure acquisition terminal via a communication line. A mechanical pressure relief valve is installed at the output port of the first oil rail.

6. The dual-fuel supply system as described in claim 2, characterized in that, The dual-fuel supply controller includes a second rail pressure acquisition terminal and a first pressure control terminal; the second terminal of the dual-fuel high-pressure oil pump module includes a second oil pump output port; the dual-fuel high-pressure oil rail module includes: The second fuel rail has a second fuel rail inlet and a second fuel pump outlet connected by an outlet pipe. The third fuel rail outlet is connected to the second end of the second fuel delivery module by a return pipe. The fourth fuel rail outlet serves as the second fuel rail outlet. The second rail pressure sensor is installed on the second fuel oil rail and is connected to the second rail pressure acquisition terminal via a communication line. The first pressure control valve is located at the output port of the third oil rail and is connected to the first pressure control terminal via a control line.

7. The dual-fuel supply system as described in claim 2, characterized in that, The dual-fuel supply controller includes a first metering control terminal and a second metering control terminal, and the dual-fuel high-pressure oil pump module includes: A dual-fuel high-pressure oil pump, wherein the first oil pump inlet of the dual-fuel high-pressure oil pump is connected to the first end of the first fuel delivery module via an oil outlet pipe, the second oil pump inlet of the dual-fuel high-pressure oil pump is connected to the first end of the second fuel delivery module via an oil outlet pipe, the first oil pump outlet of the dual-fuel high-pressure oil pump serves as the first oil pump outlet of the dual-fuel high-pressure oil pump module, the second oil pump outlet of the dual-fuel high-pressure oil pump serves as the second oil pump outlet of the dual-fuel high-pressure oil pump module, the third oil pump outlet of the dual-fuel high-pressure oil pump is connected to the first end of the first fuel delivery module via a return oil pipe, and the fourth oil pump outlet of the dual-fuel high-pressure oil pump is connected to the first end of the second fuel delivery module via a return oil pipe; The first metering device is installed at the input port of the first oil pump and is connected to the first metering control terminal via a control line. The second meter is located at the inlet of the second oil pump and is connected to the second metering control terminal via a control line.

8. The dual-fuel supply system as described in claim 7, characterized in that, The first fuel delivery module includes: The first fuel tank, the first return port of the first fuel tank is connected to the output port of the third fuel pump, the first fuel rail output port in the dual-fuel high-pressure fuel rail module and the first direct injection output port in the dual-fuel direct injection module through a return pipe; The first coarse filter, wherein the first coarse filter inlet of the first coarse filter is connected to the first oil outlet of the first fuel tank via an oil outlet pipe; The first oil pump is connected to the first coarse filter outlet of the first coarse filter via an oil outlet pipe. The first fine filter has its first fine filter inlet connected to the first oil outlet of the first oil pump via an oil outlet pipe, and its first fine filter outlet connected to the input port of the first oil pump via an oil outlet pipe.

9. The dual-fuel supply system as described in claim 7, characterized in that, The second fuel delivery module includes: The second fuel tank, the second return port of the second fuel tank is connected to the output port of the fourth oil pump and the fourth oil rail output port in the dual-fuel high-pressure oil rail module through a return pipe; The second coarse filter, the second coarse filter inlet of the second coarse filter is connected to the second oil outlet of the second fuel tank through an oil outlet pipe; The second oil pump is connected to the second coarse filter outlet of the second coarse filter via an oil outlet pipe. The second fine filter has its second fine filter inlet connected to the second oil outlet of the second oil pump via an oil outlet pipe, and its second fine filter outlet connected to the input port of the second oil pump via an oil outlet pipe.

10. The dual-fuel supply system as described in any one of claims 1 to 9, characterized in that, If the rail pressure difference between the first rail pressure value and the second rail pressure value in the rail pressure information is less than a preset rail pressure difference threshold, the first pressure control valve in the dual-fuel high-pressure oil rail module is controlled to depressurize the second fuel.

11. An engine, characterized in that, The engine includes the dual-fuel supply system as described in any one of claims 1 to 10.

12. A mechanical device, characterized in that, The mechanical equipment includes the engine as described in claim 11.

Images