Dual-fuel supply system, engine and vehicle

Abstract

The invention discloses a dual-fuel supply system, an engine and a vehicle, 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

Technical Field

[0001] The present application relates to the technical field of engines, and particularly to a dual-fuel supply system, an engine, and a vehicle. Background Art

[0002] With the continuous development of engines, users have also put forward higher requirements for the structural design of fuel supply in engines, especially for the structural design of dual-fuel supply systems.

[0003] The structural design of traditional dual-fuel supply systems is that the supply of both fuels is an independent system. This structural design of dual-fuel supply systems has certain defects. There is a phenomenon that two sets of independent supply systems need to be used. That is, because this new dual-fuel supply system needs to use two sets of independent supply systems, the implementation cost of the dual-fuel supply system is high.

[0004] The above content is only used to assist in understanding the technical solution of the present application, and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present application is to provide a dual-fuel supply system, an engine, and a vehicle, aiming to solve the technical problem of high implementation cost of the dual-fuel supply system.

[0006] To achieve the above object, the present application provides a dual-fuel supply system, which includes:

[0007] A first fuel delivery module and a second fuel delivery module;

[0008] A dual-fuel high-pressure oil pump module, the first end of the dual-fuel high-pressure oil pump module is respectively connected to the first end of the first fuel delivery module and the first end of the second fuel delivery module, and the third end of the dual-fuel high-pressure oil pump module is respectively connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module;

[0009] A dual-fuel high-pressure oil rail module, the first end of the dual-fuel high-pressure oil rail module is connected to the second end of the dual-fuel high-pressure oil pump module, and the third end of the dual-fuel high-pressure oil rail module is respectively connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module;

[0010] A dual-fuel direct injection module, 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;

[0011] Dual-fuel supply controller, the dual-fuel supply controller is connected to 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. 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.

[0012] In one embodiment, the dual-fuel supply controller includes a first direct injection control end and a second direct injection control end. The second end of the dual-fuel high-pressure oil rail module includes a first fuel oil rail outlet and a second fuel oil rail outlet. The dual-fuel direct injection module includes:

[0013] High-pressure fuel pipe adapter, the adapter input port of the high-pressure fuel pipe adapter is connected to the first fuel oil rail outlet through an outlet pipe;

[0014] First direct injection injector, the first direct injection input port of the first direct injection injector is connected to the first adapter output port of the high-pressure fuel pipe adapter through an outlet pipe. The first direct injection output port of the first direct injection injector is connected to the second end of the first fuel delivery module through a return pipe. The first control valve on the first direct injection injector is connected to the first direct injection control end through a control line;

[0015] Second direct injection injector, the second direct injection input port of the second direct injection injector is connected to the second adapter output port of the high-pressure fuel pipe adapter through an outlet pipe. The third direct injection input port of the second direct injection injector is connected to the second fuel oil rail outlet through an outlet pipe. The second direct injection output port of the second direct injection injector is connected to the second end of the first fuel delivery module through a return pipe. The second control valve on the second direct injection injector is connected to the second direct injection control end through a control line.

[0016] In one embodiment, the dual-fuel supply controller includes a first rail pressure acquisition end. The second end of the dual-fuel high-pressure oil pump module includes a first oil pump outlet. The dual-fuel high-pressure oil rail module includes:

[0017] First fuel oil rail, the first oil rail input port of the first fuel oil rail is connected to the first oil pump outlet through an outlet pipe. The first oil rail output port of the first fuel oil rail is connected to the second end of the first fuel delivery module through a return pipe. The second oil rail output port of the first fuel oil rail serves as the first fuel oil rail outlet;

[0018] The first rail pressure sensor is disposed on the first fuel oil rail, and the first rail pressure sensor is connected to the first rail pressure acquisition end through a communication line;

[0019] The mechanical pressure limiting valve is disposed at the first oil rail outlet.

[0020] In one embodiment, the dual-fuel supply controller includes a second rail pressure acquisition end and a first pressure control end. The second end of the dual-fuel high-pressure oil pump module includes a second oil pump outlet. The dual-fuel high-pressure oil rail module includes:

[0021] The second fuel oil rail. The second oil rail input port of the second fuel oil rail is connected to the second oil pump outlet through an oil outlet pipe. The third oil rail output port of the second fuel oil rail is connected to the second end of the second fuel delivery module through a return oil pipe. The fourth oil rail output port of the second fuel oil rail serves as the second fuel oil rail outlet;

[0022] The second rail pressure sensor is disposed on the second fuel oil rail, and the second rail pressure sensor is connected to the second rail pressure acquisition end through a communication line;

[0023] The first pressure control valve is disposed at the third oil rail output port, and the first pressure control valve is connected to the first pressure control end through a control line.

[0024] In one embodiment, the dual-fuel supply controller includes a first metering control end and a second metering control end. The dual-fuel high-pressure oil pump module includes:

[0025] The dual-fuel high-pressure oil pump. The first oil pump input port of the dual-fuel high-pressure oil pump is connected to the first end of the first fuel delivery module through an oil outlet pipe. The second oil pump input port of the dual-fuel high-pressure oil pump is connected to the first end of the second fuel delivery module through an oil outlet pipe. The first oil pump output port of the dual-fuel high-pressure oil pump serves as the first oil pump output port of the dual-fuel high-pressure oil pump module. The second oil pump output port of the dual-fuel high-pressure oil pump serves as the second oil pump output port of the dual-fuel high-pressure oil pump module. The third oil pump output port of the dual-fuel high-pressure oil pump is connected to the first end of the first fuel delivery module through a return oil pipe. The fourth oil pump output port of the dual-fuel high-pressure oil pump is connected to the first end of the second fuel delivery module through a return oil pipe;

[0026] The first meter is disposed at the first oil pump input port, and the first meter is connected to the first metering control end through a control line;

[0027] A second meter, the second meter is arranged at the input port of the second oil pump, and the second meter is connected to the second metering control end through a control line.

[0028] In one embodiment, the first fuel delivery module includes:

[0029] A first fuel tank, the first oil return port of the first fuel tank is connected to the output port of the third oil pump, the output port of the first oil rail in the dual-fuel high-pressure oil rail module, and the output port of the first direct injection in the dual-fuel direct injection module through an oil return pipe;

[0030] A first coarse filter, the first coarse filter inlet of the first coarse filter is connected to the first oil outlet of the first fuel tank through an oil outlet pipe;

[0031] A first fuel pump, the first fuel pump inlet of the first fuel pump is connected to the first coarse filter outlet of the first coarse filter through an oil outlet pipe;

[0032] A first fine filter, the first fine filter inlet of the first fine filter is connected to the first fuel pump outlet of the first fuel pump through an oil outlet pipe, and the first fine filter outlet of the first fine filter is connected to the first oil pump inlet through an oil outlet pipe.

[0033] In one embodiment, the second fuel delivery module includes:

[0034] A second fuel tank, the second oil return port of the second fuel tank is connected to the output port of the fourth oil pump and the output port of the fourth oil rail in the dual-fuel high-pressure oil rail module through an oil return pipe;

[0035] A 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;

[0036] A second fuel pump, the second fuel pump inlet of the second fuel pump is connected to the second coarse filter outlet of the second coarse filter through an oil outlet pipe;

[0037] A second fine filter, the second fine filter inlet of the second fine filter is connected to the second fuel pump outlet of the second fuel pump through an oil outlet pipe, and the second fine filter outlet of the second fine filter is connected to the second oil pump inlet through an oil outlet pipe.

[0038] In one embodiment, when 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 relieve pressure on the second fuel.

[0039] In addition, to achieve the above object, the present application further provides an engine, and the engine includes the above dual-fuel supply system.

[0040] In addition, to achieve the above object, the present application further provides a vehicle, and the vehicle includes the above engine.

[0041] An embodiment of the present application provides a dual-fuel supply system, which includes a first fuel delivery module and a second fuel delivery module; a dual-fuel high-pressure oil pump module, the first end of the dual-fuel high-pressure oil pump module is respectively connected to the first end of the first fuel delivery module and the first end of the second fuel delivery module, and the third end of the dual-fuel high-pressure oil pump module is respectively connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module; a dual-fuel high-pressure oil rail module, the first end of the dual-fuel high-pressure oil rail module is connected to the second end of the dual-fuel high-pressure oil pump module, and the third end of the dual-fuel high-pressure oil rail module is respectively connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module; a dual-fuel direct injection module, 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, the dual-fuel supply controller is connected to 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, and 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 passes through the first fuel delivery module and the second fuel delivery module in sequence 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 to complete the supply of the first fuel and the second fuel, and at the same time 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 controls the second fuel delivery module to supply the second fuel, thereby avoiding the occurrence of the phenomenon that the dual-fuel supply system needs to use two sets of independent supply systems to achieve fuel supply. This dual-fuel supply system passes through the first fuel delivery module and the second fuel delivery module in sequence 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 to complete the supply of the first fuel and the second fuel, which can reduce the use of high-pressure oil pumps and high-pressure oil rails in the two sets of independent systems, and further reduce the implementation cost of the dual-fuel supply system. Description of the Drawings

[0042] Figure 1 It is a schematic framework diagram of the first embodiment of the dual-fuel supply system of the present application;

[0043] Figure 2It is a schematic framework diagram of the dual-fuel direct injection module in the dual-fuel supply system of the present application;

[0044] Figure 3 It is a schematic framework diagram of the dual-fuel high-pressure oil rail module in the dual-fuel supply system of the present application;

[0045] Figure 4 It is a schematic framework diagram of the dual-fuel high-pressure oil pump module in the dual-fuel supply system of the present application;

[0046] Figure 5 It is a schematic framework diagram of the fuel delivery module in the dual-fuel supply system of the present application;

[0047] Figure 6 It is a schematic physical connection diagram of the dual-fuel supply system of the present application.

[0048] The realization of the purpose of the present application, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings.

[0049] Explanation of the reference numerals in the accompanying drawings:

[0050] 10. First fuel delivery module; 20. Second fuel delivery module; 30. Dual-fuel high-pressure oil pump module; 40. Dual-fuel high-pressure oil rail module; 50. Dual-fuel direct injection module; 60 (ECM). Dual-fuel supply controller; 61. First direct injection control end; 62. Second direct injection control end; 401. First fuel oil rail outlet; 402. Second fuel oil rail outlet; 51. High-pressure oil pipe adapter; 52. First direct injection injector; 53. Second direct injection injector; 54. First control valve; 55. Second control valve; 64. First rail pressure acquisition end; 65. First pressure control end; 66. Second rail pressure acquisition end; 301. First oil pump outlet; 302. Second oil pump outlet; 41. First fuel oil rail; 42. First rail pressure sensor; 43. Mechanical pressure limiting valve; 44. Second fuel oil rail; 45. Second rail pressure sensor; 46. First pressure control valve; 67. First metering control end; 68. Second metering control end; 31. Dual-fuel high-pressure oil pump; 32. First meter; 33. Second meter; 11. First fuel tank; 12. First coarse filter; 13. First fuel transfer pump; 14. First fine filter; 21. Second fuel tank; 22. Second coarse filter; 23. Second fuel transfer pump; 24. Second fine filter. Detailed implementation manners

[0051] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0052] In order to better understand the technical solution of the present application, the following will be described in detail in conjunction with the drawings in the specification and the specific implementation manners.

[0053] At present, the commonly used second fuel (taking methanol as an example in this application, and of course it can also be other second fuels with the same properties, which are not limited here) engines mainly adopt the intake port injection + spark plug ignition method, that is, methanol is injected into the intake port and then ignited in the combustion chamber. At this time, due to the corrosiveness and large latent heat of vaporization of methanol, the spark plug ignition methanol engine generally has difficulties in cold start (that is, due to the large latent heat of vaporization, it is difficult to form a sufficient mixture during low-temperature start, and ignition is difficult), wet wall wear in the cylinder (that is, entering the combustion chamber from the air passage, part of the methanol does not vaporize and evaporate, and the liquid methanol flushes the inner surface of the cylinder liner, resulting in a decrease in lubrication performance and thus exacerbating the cylinder liner wear), etc. At the same time, the improvement of thermal efficiency is restricted by pre-mixed combustion knock (in the methanol intake port injection mode, methanol and air are fully mixed to form a mixture before ignition. When the spark plug ignites, the flame propagates from the fire kernel position into the combustion chamber. If the mixture far from the spark plug position auto-ignites before the flame arrives, the engine will produce knock, and the cylinder pressure of the engine will rise sharply, resulting in severe vibration of the engine, which has a serious impact on the performance and life of the engine), and the power per liter (the maximum power that can be generated per liter of displacement) is also lower than that of a diesel engine. In the research of dual-fuel methanol engines, the methanol intake port injection pre-mixing + diesel direct injection ignition scheme is mostly adopted. However, the combustion mode of methanol intake port injection pre-mixing is still affected by factors such as knock and combustion stability, resulting in a generally low methanol substitution rate. In addition, the structural design method of the existing dual-fuel supply system is that the supply of both fuels is an independent system, that is, two independent high-pressure supply systems need to be used, and there is no installation space for the engine.

[0054] Therefore, based on the above deficiencies of the dual-fuel supply system, the dual-fuel supply system of this application is proposed. The main solution of the embodiment of this application is: The first fuel delivery module and the second fuel delivery module reach the dual-fuel supply controller through the dual-fuel high-pressure oil pump module and the dual-fuel high-pressure oil rail module in sequence 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 controls the second fuel delivery module to supply the second fuel, thereby avoiding the occurrence of the phenomenon that the dual-fuel supply system needs to use two independent supply systems to achieve fuel supply. This dual-fuel supply system reaches the dual-fuel supply controller through the first fuel delivery module and the second fuel delivery module through the dual-fuel high-pressure oil pump module and the dual-fuel high-pressure oil rail module in sequence to complete the supply of the first fuel and the second fuel, which can reduce the use of high-pressure oil pumps and high-pressure oil rails in the two independent systems, and thus reduce the implementation cost of the dual-fuel supply system.

[0055] Based on this, the embodiment of this application provides a dual-fuel supply system, referring to Figure 1 , Figure 1This is a schematic framework diagram of the first embodiment of the dual-fuel supply system of the present application.

[0056] Referring to Figure 1 , the present application provides a dual-fuel supply system 100, and the dual-fuel supply system 100 includes:

[0057] A first fuel delivery module 10 and a second fuel delivery module 20;

[0058] A dual-fuel high-pressure oil pump module 30, the first end of the dual-fuel high-pressure oil pump module 30 is respectively connected to the first end of the first fuel delivery module 10 and the first end of the second fuel delivery module 20, and the third end of the dual-fuel high-pressure oil pump module 30 is respectively connected to the second end of the first fuel delivery module 10 and the second end of the second fuel delivery module 20;

[0059] A dual-fuel high-pressure oil rail module 40, the first end of the dual-fuel high-pressure oil rail module 40 is connected to the second end of the dual-fuel high-pressure oil pump module 30, and the third end of the dual-fuel high-pressure oil rail module 40 is respectively connected to the second end of the first fuel delivery module 10 and the second end of the second fuel delivery module 20;

[0060] A dual-fuel direct injection module 50, the first end of the dual-fuel direct injection module 50 is connected to the second end of the dual-fuel high-pressure oil rail module 40, and the second end of the dual-fuel direct injection module 50 is connected to the second end of the first fuel delivery module 10;

[0061] A dual-fuel supply controller 60, the dual-fuel supply controller 60 is connected to the fourth end of the dual-fuel high-pressure oil pump module 30, the fourth end of the dual-fuel high-pressure oil rail module 40 and the third end 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.

[0062] In this embodiment, the dual-fuel supply system 100 realizes the integrated supply of dual fuels by designing the dual-fuel high-pressure oil pump module 30 and the dual-fuel high-pressure oil rail module 40. That is, based on the dual-fuel supply controller 60, the rail pressure information of the dual-fuel high-pressure oil rail module 40 can be collected, and then the dual-fuel high-pressure oil rail module 40 can be controlled based on the rail pressure information to achieve 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 rail pressure value of the fuel collected by the dual-fuel high-pressure oil rail module 40. The flow rates of the two fuels are mainly controlled based on the dual-fuel high-pressure oil rail module 40. The flow rate information refers to the fuel flow rates of the first fuel delivery module 10 and the second fuel delivery module 20 delivered to the dual-fuel high-pressure oil pump module 30. For example, if the engine operating condition determines that the rail pressure value of fuel D is A, while the actually collected rail pressure value is B, and B is less than A, the flow rate of fuel D will be increased, and then the rail pressure value of fuel D will be increased to complete the dual-fuel supply control. Since the dual-fuel high-pressure oil pump module 30 and the dual-fuel high-pressure oil rail module 40 adopt an integrated design, the oil pump drives the common rail systems of the first fuel and the second fuel (but the dual fuels are independently controlled and driven without affecting each other), meeting the engine mounting and driving requirements, and thus the implementation cost of the dual-fuel supply system can be reduced. It should be noted that if one of the fuels in the dual-fuel supply is corrosive, another fuel can be used for hydraulic drive on the fuel injector of this fuel to avoid corrosion damage to the control components. For example, 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 components of the injector of the second fuel (clean fuel, such as methanol), thereby increasing the service life of the dual-fuel supply system.

[0063] It should be noted that 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 in this application 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, where A and B are not in the same position. That is, the separate connection means that different parts of a certain position are separately connected to different modules. The subsequent separate connections also have the same meaning as above, and are not limited here.

[0064] It should be noted that the dual-fuel supply system 100 further includes the assembly design of the cylinder liner, piston and cylinder head to form a combustion chamber, so as to realize the combustion of fuel in the combustion chamber. Of course, the combustion chamber may further include other components, such as the air inlet and outlet for air exchange between the combustion chamber and the outside, and the opening or closing device provided at the air inlet and outlet, etc., which will not be elaborated here one by one. For a special combustion chamber structure, the second direct injection injector in the dual-fuel direct injection module 50 can be designed to be installed at the central position of the inner wall of the cylinder head in 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 less than a preset first distance value from the central position. Herein, the inner wall of the cylinder head is the side of the cylinder head that forms the combustion chamber, that is, by designing the second direct injection injector at the middle position (at this time, the combustion chamber can use a W-shaped rotating cavity, combined with the fuel injection beam arrangement of the second direct injection injector, to optimize the combustion process of the second fuel), the clean fuel in the second direct injection injector can be fully burned. 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.

[0065] In this embodiment, a dual-fuel supply system is provided, which includes a first fuel delivery module and a second fuel delivery module; a dual-fuel high-pressure oil pump module, the first end of the dual-fuel high-pressure oil pump module is respectively connected to the first end of the first fuel delivery module and the first end of the second fuel delivery module, and the third end of the dual-fuel high-pressure oil pump module is respectively connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module; a dual-fuel high-pressure oil rail module, the first end of the dual-fuel high-pressure oil rail module is connected to the second end of the dual-fuel high-pressure oil pump module, and the third end of the dual-fuel high-pressure oil rail module is respectively connected to the second end of the first fuel delivery module and the second end of the second fuel delivery module; a dual-fuel direct injection module, 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, the dual-fuel supply controller is connected to 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. 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 passes through the first fuel delivery module and the second fuel delivery module to reach the dual-fuel supply controller via the dual-fuel high-pressure oil pump module and the dual-fuel high-pressure oil rail module in sequence 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 controls the second fuel delivery module to supply the second fuel, thereby avoiding the occurrence of the phenomenon that two sets of independent supply systems are required for the fuel supply of the dual-fuel supply system. This dual-fuel supply system passes through the first fuel delivery module and the second fuel delivery module to reach the dual-fuel supply controller via the dual-fuel high-pressure oil pump module and the dual-fuel high-pressure oil rail module in sequence to complete the supply of the first fuel and the second fuel, which can reduce the use of high-pressure oil pumps and high-pressure oil rails in the two sets of independent systems, and further reduce the implementation cost of the dual-fuel supply system.

[0066] Further, based on the first embodiment of the present application above, a second embodiment of the dual-fuel supply system of the present application is proposed. Refer to Figure 2 , Figure 2 is a frame schematic diagram of the dual-fuel direct injection module in the dual-fuel supply system of the present application. The dual-fuel supply controller 60 includes a first direct injection control end 61 and a second direct injection control end 62. The second end of the dual-fuel high-pressure oil 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:

[0067] High-pressure fuel pipe adapter 51, the transfer input port of the high-pressure fuel pipe adapter 51 is connected to the first fuel rail output port 401 through an outlet pipe;

[0068] The first direct injection injector 52 (a commonly used direct injection injector), the first direct injection input port of the first direct injection injector 52 is connected to the first transfer output port of the high-pressure fuel pipe adapter 51 through an 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 pipe, and the first control valve 54 on the first direct injection injector 52 is connected to the first direct injection control end 61 through a control line;

[0069] The second direct injection injector 53 (a commonly used direct injection injector), the second direct injection input port of the second direct injection injector 53 is connected to the second transfer output port of the high-pressure fuel pipe adapter 51 through an outlet pipe, the third direct injection input port of the second direct injection injector 53 is connected to the second fuel rail output port 402 through an outlet pipe, the second direct injection output port of the second direct injection injector 53 is connected to the second end of the first fuel delivery module 10 through a return pipe, and the second control valve 55 on the second direct injection injector 53 is connected to the second direct injection control end 62 through a control line.

[0070] In the present embodiment, the dual-fuel direct injection module 50 includes a high-pressure oil pipe adapter 51, wherein the high-pressure oil pipe adapter 51 is connected to a first direct injection injector 52 (generally an injector for ignition fuel) and a second direct injection injector 53 (generally an injector for clean fuel) by a high-pressure oil pipe to output the first fuel and the second fuel. The design of the high-pressure oil pipe adapter 51 can reduce the high-pressure interface on the dual-fuel high-pressure oil rail module 40 and simplify the high-pressure pipeline connection. At this time, the high-pressure fuel outputted from the first fuel rail output port 401 and the second fuel rail output port 402 is connected to the first direct injection injector 52 and the second direct injection injector 53 by the high-pressure oil pipe, and then the first direct injection control end 61 and the second direct injection control end 62 control the first control valve 54 and the second control valve 55 on the two injectors to realize direct injection control. The control principle may be as follows: the engine ECM (Engine Control Module) independently controls the injection parameters, the injection parameters include injection pressure, injection start angle, injection amount, that is, the relevant parameters of the fuel output to the oil beam. The above parameters may be adaptively controlled based on the engine operating conditions. The engine operating conditions include at least engine speed, engine torque, engine water temperature, and intake air temperature. The injection parameters corresponding to the above conditions (including first fuel injection parameters and second fuel injection parameters) are determined in the corresponding parameter table at least according to the above four conditions, and the dual-fuel direct injection module 50 is controlled based on the respective parameters. It is worth mentioning that in addition to parameter control, there is also control of direct injection time. The first direct injection injector 52 in the dual-fuel direct injection module 50 starts to spray before the top dead center of the engine. After the first direct injection injector 52 sprays, the oil beam is atomized and diffused, mixed with the surrounding air and burned, thereby 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 moment of injection, the overall temperature in the cylinder is higher than the auto-ignition temperature of the second fuel. The second fuel is diffused and burned. The oil beam mixes with the surrounding air while burning, thereby avoiding a large amount of second fuel evaporating and absorbing heat, causing the temperature in the cylinder to drop. During cold start, the proportion of the first fuel can be increased to optimize the cold start performance.

[0071] It is worth noting that, because the first direct injection fuel injector 52 and the second direct injection fuel injector 53 are both driven by the first fuel, the first direct injection fuel injector 52 and the second direct injection fuel injector 53 will return the fuel used for driving to the first fuel delivery module 10 through a return pipe to ensure fuel recycling. In addition, the spray holes of the first direct injection fuel injector 52 and the second direct injection fuel injector 53 are arranged according to the set spatial position, and the fuel oil beams are sprayed from the spray holes, and the two oil beams sprayed from the spray holes are staggered in space to avoid the rear direct injection fuel affecting the flame of the front direct injection fuel (such as being directly sprayed out), thereby ensuring the normal driving combustion of the dual fuel supply.

[0072] In one embodiment, based on the first embodiment and / or the second embodiment of the present application above, a third embodiment of the dual-fuel supply system of the present application is proposed. Refer to Figure 3 , Figure 3 which is a schematic framework diagram of the dual-fuel high-pressure oil rail module in the dual-fuel supply system of the present application. The dual-fuel supply controller 60 includes a first rail pressure acquisition end 64. The second end of the dual-fuel high-pressure oil pump module 30 includes a first oil pump output port 301. The dual-fuel high-pressure oil rail module 40 includes:

[0073] A first fuel oil rail 41. The first oil rail input port of the first fuel oil rail 41 is connected to the first oil pump output port 301 through an oil outlet pipe. The first oil rail output port of the first fuel oil rail 41 is connected to the second end of the first fuel delivery module 10 through a return pipe. The second oil rail output port of the first fuel oil rail 41 serves as the first fuel oil rail output port 401;

[0074] A first rail pressure sensor 42. The first rail pressure sensor 42 is arranged on the first fuel oil rail 41. The first rail pressure sensor 42 is connected to the first rail pressure acquisition end 64 through a communication line;

[0075] A mechanical pressure limiting valve 43. The mechanical pressure limiting valve 43 is arranged at the first oil rail output port.

[0076] In one embodiment, the dual-fuel supply controller 60 includes a second rail pressure acquisition end 66 and a first pressure control end 65. The second end of the dual-fuel high-pressure oil pump module 30 includes a second oil pump output port 302. The dual-fuel high-pressure oil rail module 40 includes:

[0077] A second fuel oil rail 44. The second oil rail input port of the second fuel oil rail 44 is connected to the second oil pump output port 302 through an oil outlet pipe. The third oil rail output port of the second fuel oil rail 44 is connected to the second end of the second fuel delivery module 20 through a return pipe. The fourth oil rail output port of the second fuel oil rail 44 serves as the second fuel oil rail output port 402;

[0078] A second rail pressure sensor 45. The second rail pressure sensor 45 is arranged on the second fuel oil rail 44. The second rail pressure sensor 45 is connected to the second rail pressure acquisition end 66 through a communication line;

[0079] A first pressure control valve 46. The first pressure control valve 46 is arranged at the third oil rail output port. The first pressure control valve 46 is connected to the first pressure control end 65 through a control line.

[0080] 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 transporting the first fuel and the second fuel. At this time, since more of the second fuel is required, more than two fuel outlet pipes can be used to connect between the second fuel rail 44 and the second fuel pump outlet 302 to ensure the normal use of the second fuel. On the one hand, a first rail pressure sensor 42 is also designed on the first fuel rail 41 to collect the rail pressure of the first fuel rail 41, so as to determine whether the first fuel needs to be controlled by the dual-fuel high-pressure fuel pump module (i.e., increase the flow rate of the first fuel) when the rail pressure is lower than the required rail pressure. A mechanical pressure limiting valve 43 is also provided at the first fuel rail outlet. The main function of the mechanical pressure limiting valve 43 is to reduce the pressure of the first fuel rail 41 when the pressure of the first fuel rail 41 is too high (directly mechanically controlled). For example, by controlling the mechanical pressure limiting valve 43, the first fuel is returned from the first fuel rail outlet of the first fuel rail 41 to the first fuel delivery module 10 to achieve pressure reduction of the first fuel rail 41. The first direct injection injector 52 and the first fuel rail outlet of the first fuel rail 41 can achieve the return of the first fuel, and the fuel flows back to the first fuel delivery module 10 through the low-pressure fuel pipe. On the other hand, a second rail pressure sensor 45 is also 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 fuel pump module (i.e., increase the flow rate of the second fuel) when the rail pressure is lower than the required rail pressure. A first pressure control valve 46 is also provided at the third fuel rail outlet, such as a PVC (Pressure Control Valve) valve. The main function of the first pressure control valve 46 is to reduce the pressure of the second fuel rail 44 when the pressure of the second fuel rail 44 is too high. By controlling the first pressure control valve 46 through the first pressure control end 65, the second fuel is returned from the third fuel rail outlet of the second fuel rail 44 to the second fuel delivery module 20 to achieve pressure reduction of the second fuel rail 44. The dual-fuel high-pressure fuel pump 31 and the third fuel rail outlet of the second fuel rail 44 can achieve the return of the second fuel, and the fuel flows back to the second fuel delivery module 20 through the low-pressure fuel pipe. Furthermore, the rail pressure control of the first fuel and the second fuel can be completed to ensure the normal supply of the first fuel and the second fuel.

[0081] Based on the first embodiment, the second embodiment, and / or the third embodiment of the present application described above, a fourth embodiment of the dual-fuel supply system of the present application is proposed. Refer to Figure 4 , Figure 4 which is a schematic framework diagram of the dual-fuel high-pressure fuel pump module in the dual-fuel supply system of the present application. The dual-fuel supply controller 60 includes a first metering control end 67 and a second metering control end 68. The dual-fuel high-pressure fuel pump module 30 includes:

[0082] Dual-fuel high-pressure oil pump 31. An oil outlet pipe is used to connect the first oil pump input port of the dual-fuel high-pressure oil pump 31 and the first end of the first fuel delivery module 10. An oil outlet pipe is used to connect the second oil pump input port of the dual-fuel high-pressure oil pump 31 and the first end of the second fuel delivery module 20. The first oil pump output port of the dual-fuel high-pressure oil pump 31 serves as the first oil pump output port 301 of the dual-fuel high-pressure oil pump module 30. The second oil pump output port of the dual-fuel high-pressure oil pump 31 serves as the second oil pump output port 302 of the dual-fuel high-pressure oil pump module 30. A return oil pipe is used to connect the third oil pump output port of the dual-fuel high-pressure oil pump 31 and the first end of the first fuel delivery module 10. A return oil pipe is used to connect the fourth oil pump output port of the dual-fuel high-pressure oil pump 31 and the first end of the second fuel delivery module 20;

[0083] First meter 32. The first meter 32 is arranged at the first oil pump input port, and a control line is used to connect the first meter 32 and the first metering control end 67;

[0084] Second meter 33. The second meter 33 is arranged at the second oil pump input port, and a control line is used to connect the second meter 33 and the second metering control end 68.

[0085] 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 perform high-pressure processing on the first fuel and the second fuel. That is, the low-pressure first fuel and second fuel are pressurized by the dual-fuel high-pressure oil pump 31 and then pumped to the first fuel rail 41 and the second fuel rail 44 in the dual-fuel high-pressure fuel rail module 40 respectively. At the same time, it can also realize the return of the first fuel and the second fuel through the third oil pump output port and the fourth oil pump output port respectively. Furthermore, the high-pressure processing of the two fuels can be realized by one dual-fuel high-pressure oil pump 31, so as to reduce the implementation cost of the dual-fuel system. In order to realize the supply control of the two fuels, a first meter 32 is arranged at the first oil pump input port, and a second meter 33 is arranged at the second oil pump input port. Of course, it can also be arranged at the oil inlet and outlet of the first fuel and the second fuel at the same time to realize the control of the fuel flow rate (the function of the fuel metering unit on the oil pump is to control the fuel flow rate), so as to facilitate the subsequent supply control based on the flow rate and the collected rail pressure value. For example, if the rail pressure is small, the flow rate can be appropriately increased to reach the required rail pressure to ensure the normal supply of the dual fuel.

[0086] Based on the first embodiment, the second embodiment, the third embodiment, and / or the fourth embodiment of the present application above, the fifth embodiment of the dual-fuel supply system of the present application is proposed. Refer to Figure 5 , Figure 5 which is a schematic framework diagram of the fuel delivery module in the dual-fuel supply system of the present application. The first fuel delivery module 10 includes:

[0087] The first fuel tank 11, and a return oil pipe is connected between the first return oil port of the first fuel tank 11, the output port of the third oil pump, 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;

[0088] The first coarse filter 12, and an oil outlet pipe (generally defined that the oil outlet pipe after passing through the dual-fuel high-pressure oil pump 31 is a high-pressure oil pipe) is connected between the first coarse filter inlet of the first coarse filter 12 and the first oil outlet of the first fuel tank 11;

[0089] The first fuel transfer pump 13, and an oil outlet pipe is connected between the first fuel transfer inlet of the first fuel transfer pump 13 and the first coarse filter outlet of the first coarse filter 12;

[0090] The first fine filter 14, an oil outlet pipe is connected between the first fine filter inlet of the first fine filter 14 and the first fuel transfer outlet of the first fuel transfer pump 13, and an oil outlet pipe is connected between the first fine filter outlet of the first fine filter 14 and the first oil pump inlet.

[0091] In an embodiment, the second fuel delivery module 20 includes:

[0092] The second fuel tank 21, and a return oil pipe is connected between the second return oil port of the second fuel tank 21, the output port of the fourth oil pump, and the fourth oil rail output port in the dual-fuel high-pressure oil rail module 40;

[0093] The second coarse filter 22, and an oil outlet pipe is connected between the second coarse filter inlet of the second coarse filter 22 and the second oil outlet of the second fuel tank 21;

[0094] The second fuel transfer pump 23, and an oil outlet pipe is connected between the second fuel transfer inlet of the second fuel transfer pump 23 and the second coarse filter outlet of the second coarse filter 22;

[0095] The second fine filter 24, an oil outlet pipe is connected between the second fine filter inlet of the second fine filter 24 and the second fuel transfer outlet of the second fuel transfer pump 23, and an oil outlet pipe is connected between the second fine filter outlet of the second fine filter 24 and the second oil pump inlet.

[0096] In this embodiment, the low-pressure first fuel is extracted from the first fuel tank 11 by the first fuel transfer pump 13 and is delivered to the dual-fuel high-pressure oil pump 31 through the first coarse filter 12, the first fuel transfer pump 13, and the first fine filter 14 in the low-pressure oil pipe; the low-pressure second fuel is extracted from the second fuel tank 21 by the second fuel transfer pump 23 and is delivered to the dual-fuel high-pressure oil pump 31 through the second coarse filter 22, the second fuel transfer pump 23, and the second fine filter 24 in the low-pressure oil pipe. Of course, in order to ensure the integration of the entire system, the second fuel transfer pump 23 and the first fuel transfer pump 13 can be integrated on 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, reference can be made toFigure 6 , Figure 6 This is a schematic diagram of the physical connection of the dual-fuel supply system of the present application. The figure illustrates the fuel flow direction of the entire dual-fuel supply system (the straight lines with arrows in the figure are fuel pipes, including at least the return pipe and the outlet pipe, and the outlet pipe includes at least the high-pressure outlet pipe and the low-pressure outlet pipe), and the connection control relationship between the engine control module (i.e., the dual-fuel supply controller) and each module (the non-straight lines without arrows in the figure). It is worth noting that the second direct injection injector 53 is simultaneously connected to the high-pressure first fuel and the high-pressure second fuel, and the first fuel is used for hydraulic drive to avoid corrosion damage of the control components caused by the second fuel. Furthermore, dual-fuel supply can be achieved through the above dual-fuel supply system, and thus there is no need to use two sets of independent systems, so as to reduce the implementation cost of the dual-fuel supply system.

[0097] Based on the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, and / or the fifth embodiment of the present application described above, a sixth embodiment of the dual-fuel supply system of the present application is proposed. When the rail pressure difference between the first rail pressure value and the second rail pressure value in the rail pressure information is less than the preset rail pressure difference threshold, the first pressure control valve 46 in the dual-fuel high-pressure rail module 40 is controlled to relieve the pressure of the second fuel.

[0098] In this embodiment, since 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, on the one hand, the required rail pressure value can be determined based on parameters such as the current engine speed, torque, and temperature, and then the flow measurement can be realized through their respective meters, and further the supply control of the first fuel and the second fuel can be realized. 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 set value of the ECM under the current operating condition, and is measured in real time by the first rail pressure sensor 42 on the first fuel rail 41 for closed-loop control. For example, when the rail pressure value collected by the first rail pressure sensor 42 is low, operations such as increasing the first fuel flow are carried out through the rail pressure value collected by the first rail pressure sensor 42. The same is true for the control of the second fuel, which will not be repeated here. It should be noted that to achieve normal dual-fuel supply, it is necessary to design the first fuel rail pressure setting to be always 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, and at the same time make the first fuel slightly penetrate to the needle valve end of the second direct injection injector 53 to lubricate the needle valve assembly and avoid damage to the second direct injection injector 53 caused by the second fuel. That is, in the supply control, a first rail pressure sensor 42 is provided on the first fuel rail 41. When the first fuel rail pressure is higher than the defined pressure limit (customized) of the supply system, the mechanical pressure limiting valve 43 opens to release the first fuel to ensure the safety of the supply system; a second rail pressure sensor 45 is provided on the second fuel rail 44. When the actual pressure difference between the second fuel rail pressure and the first fuel rail pressure exceeds the set value (the set value can be 0), the second fuel rail pressure is adjusted by the first pressure control valve 46 (PCV valve) to prevent damage to the device caused by the reverse penetration of the second fuel. It should be noted that when the engine stops, the pressure drop of the first fuel is faster than that of the second fuel. The first pressure control valve 46 is used to release the pressure to prevent the second fuel from leaking back into the first fuel oil circuit when the engine stops (at this time, device corrosion may occur due to the return of the second fuel, and the above control exists). Of course, other control methods can also be used, which are not limited here.

[0099] Based on the above embodiments of the dual-fuel supply system, an engine is proposed, and the engine includes the above dual-fuel supply system.

[0100] In this embodiment, the above engine 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. Meanwhile, 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 as to enable the first fuel delivery module to supply the first fuel and / or control the second fuel delivery module to supply the second fuel, thereby avoiding the occurrence of the phenomenon that the dual-fuel supply system needs to use two sets of independent supply systems to achieve fuel supply. 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, which can reduce the use of high-pressure oil pumps and high-pressure oil rails in the two sets of independent systems, and further reduce the implementation cost of the dual-fuel supply system.

[0101] Based on the above embodiments of the dual-fuel supply system, a vehicle is proposed, and the vehicle includes the above engine.

[0102] In this embodiment, in the above vehicle, in the engine, the first fuel delivery module and the second fuel delivery module reach the dual-fuel supply controller 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, which can reduce the use of high-pressure oil pumps and high-pressure oil rails in the two sets of independent systems, and further reduce the implementation cost of the dual-fuel supply system.

[0103] The above are only partial embodiments of the present application, and thus do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A dual fuel supply system, characterized in that, The dual-fuel supply system includes: a first fuel delivery module and a second fuel delivery module; a dual-fuel high-pressure oil pump module, a first end of the dual-fuel high-pressure oil pump module is respectively connected to a first end of the first fuel delivery module and a first end of the second fuel delivery module, and a third end of the dual-fuel high-pressure oil pump module is respectively connected to a second end of the first fuel delivery module and a second end of the second fuel delivery module; a dual-fuel high-pressure oil rail module, a first end of the dual-fuel high-pressure oil rail module is connected to a second end of the dual-fuel high-pressure oil pump module, and a third end of the dual-fuel high-pressure oil rail module is respectively connected to a second end of the first fuel delivery module and a second end of the second fuel delivery module; a dual-fuel direct injection module, a first end of the dual-fuel direct injection module is connected to a second end of the dual-fuel high-pressure oil rail module, and a second end of the dual-fuel direct injection module is connected to a second end of the first fuel delivery module; a dual-fuel supply controller, the dual-fuel supply controller is connected to a fourth end of the dual-fuel high-pressure oil pump module, a fourth end of the dual-fuel high-pressure oil rail module, and a third end of the dual-fuel direct injection module, and the dual-fuel supply controller is configured to collect 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 a first fuel and / or the second fuel delivery module supplies a second fuel.

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

3. The dual-fuel supply system according to claim 2, characterized in that, The dual-fuel supply controller includes a first rail pressure acquisition end, a second end of the dual-fuel high-pressure oil pump module includes a first oil pump outlet, and the dual-fuel high-pressure oil rail module includes: The first fuel oil rail, with an oil pipe connecting between the first oil rail input port of the first fuel oil rail and the output port of the first oil pump, and a return pipe connecting between the first oil rail output port of the first fuel oil rail and the second end of the first fuel delivery module. The second oil rail output port of the first fuel oil rail serves as the first fuel oil rail output port; The first rail pressure sensor, which is arranged on the first fuel oil rail and connected to the first rail pressure acquisition end through a communication line; The mechanical pressure limiting valve, which is arranged at the first oil rail output port.

4. The dual-fuel supply system according to claim 2, characterized in that, The dual-fuel supply controller includes a second rail pressure acquisition end and a first pressure control end. The second end 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 oil rail, with an oil pipe connecting between the second oil rail input port of the second fuel oil rail and the second oil pump output port, and a return pipe connecting between the third oil rail output port of the second fuel oil rail and the second end of the second fuel delivery module. The fourth oil rail output port of the second fuel oil rail serves as the second fuel oil rail output port; The second rail pressure sensor, which is arranged on the second fuel oil rail and connected to the second rail pressure acquisition end through a communication line; The first pressure control valve, which is arranged at the third oil rail output port and connected to the first pressure control end through a control line.

5. The dual fuel supply system according to claim 2, wherein, The dual-fuel supply controller includes a first metering control end and a second metering control end. The dual-fuel high-pressure oil pump module includes: The dual-fuel high-pressure oil pump, with an oil pipe connecting between the first oil pump input port of the dual-fuel high-pressure oil pump and the first end of the first fuel delivery module, and an oil pipe connecting between the second oil pump input port of the dual-fuel high-pressure oil pump and the first end of the second fuel delivery module. The first oil pump output port of the dual-fuel high-pressure oil pump serves as the first oil pump output port of the dual-fuel high-pressure oil pump module, and the second oil pump output port of the dual-fuel high-pressure oil pump serves as the second oil pump output port of the dual-fuel high-pressure oil pump module. A return pipe connects between the third oil pump output port of the dual-fuel high-pressure oil pump and the first end of the first fuel delivery module, and a return pipe connects between the fourth oil pump output port of the dual-fuel high-pressure oil pump and the first end of the second fuel delivery module; The first meter, which is arranged at the first oil pump input port and connected to the first metering control end through a control line; The second meter, which is arranged at the second oil pump input port and connected to the second metering control end through a control line.

6. The dual fuel supply system according to claim 5, characterized in that, The first fuel delivery module includes: The first fuel tank, with a return pipe connecting between the first return oil port of the first fuel tank, the third oil pump output port, the first oil rail output port in the dual-fuel high-pressure oil rail module, and the first direct injection output port in the dual-fuel direct injection module; A first coarse filter, wherein an oil outlet pipe is connected between a first coarse filter inlet of the first coarse filter and a first oil outlet of the first fuel tank; A first fuel pump, wherein an oil outlet pipe is connected between a first fuel pump inlet of the first fuel pump and a first coarse filter outlet of the first coarse filter; A first fine filter, wherein an oil outlet pipe is connected between a first fine filter inlet of the first fine filter and a first fuel pump outlet of the first fuel pump, and an oil outlet pipe is connected between a first fine filter outlet of the first fine filter and a first oil pump inlet; 7. The dual-fuel supply system according to claim 5, characterized in that, The second fuel delivery module includes: A second fuel tank, wherein a return oil pipe is connected between a second return oil port of the second fuel tank, an output port of the fourth oil pump, and an output port of a fourth oil rail in the dual-fuel high-pressure oil rail module; A second coarse filter, wherein an oil outlet pipe is connected between a second coarse filter inlet of the second coarse filter and a second oil outlet of the second fuel tank; A second fuel pump, wherein an oil outlet pipe is connected between a second fuel pump inlet of the second fuel pump and a second coarse filter outlet of the second coarse filter; A second fine filter, wherein an oil outlet pipe is connected between a second fine filter inlet of the second fine filter and a second fuel pump outlet of the second fuel pump, and an oil outlet pipe is connected between a second fine filter outlet of the second fine filter and a second oil pump inlet; 8. The dual fuel supply system according to any one of claims 1 to 7, characterized in that, When a rail pressure difference between a first rail pressure value and a second rail pressure value in the rail pressure information is less than a preset rail pressure difference threshold, control a first pressure control valve in the dual-fuel high-pressure oil rail module to relieve pressure on the second fuel; 9. An engine, characterized in that, The engine includes the dual-fuel supply system according to any one of claims 1 to 8; 10. A vehicle, characterized in that, The vehicle includes the engine according to claim 9.

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