Pressure regulating system, dual fuel engine and pressure regulating method

Abstract

The present application relates to the technical field of engine, and discloses a pressure regulating system, a dual-fuel engine and a pressure regulating method, the pressure regulating system comprising a first regulating device, a second regulating device and a control device, the first regulating device comprising a first detection member and a first regulating assembly, the first detection member detecting an actual fuel rail pressure of a fuel common rail pipe, the control device controlling the first regulating assembly to regulate the actual fuel rail pressure according to a difference between the actual fuel rail pressure and a fuel rail pressure target value, the second regulating device comprising a second detection member and a plurality of buffer units, the second detection member detecting an actual gas rail pressure of a gas common rail pipe, and the control device controlling the plurality of buffer units to regulate the actual gas rail pressure according to a difference between the actual gas rail pressure and the fuel rail pressure target value.The present application realizes decoupling of the fuel rail pressure and the gas rail pressure, and can regulate the fuel rail pressure and the gas rail pressure separately, thereby improving the fuel pressure and the combustion effect.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a pressure regulation system, a dual-fuel engine, and a pressure regulation method. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] The HPDI engine is a diesel-ignition, dual-fuel engine. It includes both fuel and gas supply systems, using natural gas as its primary fuel while maintaining the power, torque, and efficiency of a traditional diesel engine. During fuel injection, the dual-fuel engine requires a certain pressure balance between the two fuels, necessitating pressure regulation of both the fuel and gas systems.

[0004] Existing pressure regulating devices include gas pressure regulating modules, which automatically adjust the gas pressure according to the fuel rail pressure via mechanical devices. This adjustment method causes the gas rail pressure to always change with the fuel rail pressure, making it impossible to increase the fuel pressure independently. Low fuel pressure leads to low thermal efficiency and affects engine performance. Summary of the Invention

[0005] The purpose of this invention is to at least solve the problem that existing dual-fuel engine pressure regulating devices cannot separately adjust the fuel rail pressure and the gas rail pressure, thus affecting engine performance. This objective is achieved through the following technical solution:

[0006] A first aspect of the present invention provides a pressure regulation system for use in a dual-fuel engine, comprising:

[0007] The first adjustment device includes a first detection element and a first adjustment assembly for connecting to the common fuel rail of the dual-fuel engine. The first detection element is used to detect the actual fuel rail pressure in the common fuel rail.

[0008] The second regulating device includes a second detection element and a second regulating assembly for connecting to the common gas rail of the dual-fuel engine. The second detection element is used to detect the actual gas rail pressure in the common gas rail. The second regulating assembly includes a plurality of buffer units, each of which is connected to the common gas rail.

[0009] A control device is connected to the first detection element, the first adjustment component, the second detection element, and the plurality of buffer units. The control device controls the first adjustment component to adjust the actual fuel rail pressure based on the difference between the actual fuel rail pressure and the target fuel rail pressure value. The control device also controls the plurality of buffer units to adjust the actual gas rail pressure based on the difference between the actual gas rail pressure and the target gas rail pressure value.

[0010] The pressure regulation system of this invention comprises a first regulating device, a second regulating device, and a control device. The first regulating device includes a first detection element and a first regulating component. The first detection element detects the actual fuel rail pressure in the common fuel rail. The control device controls the first regulating component to adjust the actual fuel rail pressure based on the difference between the actual fuel rail pressure and a target fuel rail pressure value. The second regulating device includes a second detection element and multiple buffer units. The second detection element detects the actual gas rail pressure in the common gas rail. The control device controls the multiple buffer units to adjust the actual gas rail pressure based on the difference between the actual gas rail pressure and the target fuel rail pressure value. This pressure regulation system decouples the fuel rail pressure and the common gas rail pressure, allowing for independent adjustment of both, thereby increasing fuel pressure and improving fuel combustion efficiency. It also eliminates the need for a gas pressure regulating module, reducing system complexity.

[0011] In addition, the pressure regulating system according to the present invention may also have the following additional technical features:

[0012] In some embodiments of the present invention, each buffer unit includes a buffer gas tank and a control valve connected to the outlet of the buffer gas tank. The multiple buffer gas tanks are respectively provided with gas, and the pressure values ​​of the gas in the multiple buffer gas tanks correspond to different gas rail pressure target values. The multiple control valves are connected to the respective control devices.

[0013] In some embodiments of the present invention, the first detection element includes a first pressure sensor disposed on the fuel common rail, and the first adjustment assembly includes a first pump body and a fuel tank, wherein the first pump body is connected to the fuel tank and the fuel common rail respectively.

[0014] In some embodiments of the present invention, the second regulating component further includes a second pump body and a gas tank, with both ends of the second pump body connected to the gas tank and the common rail gas pipeline, respectively, and a plurality of the buffer units disposed between the gas tank and the common rail gas pipeline.

[0015] In some embodiments of the present invention, the second detection element includes a second pressure sensor disposed on the common rail gas line.

[0016] In some embodiments of the present invention, the pressure regulating device further includes a throttle detection component, which includes an accelerator pedal and a throttle sensor. The throttle sensor is electrically connected to the control device and is used to acquire the throttle signal emitted by the accelerator pedal.

[0017] In some embodiments of the present invention, the pressure regulating device further includes a speed detection component, the speed detection component including a phase sensor, the phase sensor being electrically connected to the control device, and the phase sensor being used to acquire a speed signal.

[0018] In some embodiments of the present invention, the pressure regulating device further includes a first filter and a second filter, wherein the first filter is disposed upstream of the fuel common rail and communicates with the fuel common rail, and the second filter is disposed in the gas common rail and communicates with the gas common rail.

[0019] A second aspect of the invention provides a dual-fuel engine, comprising an engine body and a pressure regulating system as described in any of the preceding claims, the engine body having a fuel common rail and a gas common rail, a first regulating device connected to the fuel common rail, and a second regulating device connected to the fuel common rail.

[0020] A third aspect of the present invention provides a pressure regulation method for pressure regulation of a dual-fuel engine as described above, the pressure regulation method comprising the following steps:

[0021] The control device obtains the actual fuel rail pressure of the fuel common rail and controls the first adjustment component to adjust the actual fuel rail pressure according to the difference between the actual fuel rail pressure and the target fuel rail pressure value, so that the actual fuel rail pressure reaches the target fuel rail pressure value.

[0022] The control device obtains the actual gas rail pressure of the common gas rail pipe, and controls the second adjustment component to adjust the actual gas rail pressure according to the difference between the actual gas rail pressure and the target gas rail pressure value, so that the actual gas rail pressure reaches the target gas rail pressure value. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0024] Figure 1 A schematic diagram of the structure of a pressure regulating system according to an embodiment of the present invention is shown.

[0025] Figure 2 A schematic diagram of the gas rail set pressure zone of a pressure regulating system according to an embodiment of the present invention is shown.

[0026] Figure 3A schematic flowchart of a pressure regulation method according to an embodiment of the present invention is shown.

[0027] The attached figures are labeled as follows:

[0028] 1. Fuel common rail; 2. Gas common rail; 3. First buffer gas tank; 4. First control valve; 5. Second buffer gas tank; 6. Second control valve; 7. Third buffer gas tank; 8. Third control valve; 9. First pressure sensor; 10. First pump body; 11. Fuel tank; 12. Second pump body; 13. Gas tank; 14. Second pressure sensor; 15. Accelerator pedal; 16. Phase sensor; 17. Electronic control unit; 18. First filter; 19. Second filter; 20. Intake pipe; 21. Exhaust pipe; 22. Nozzle. Detailed Implementation

[0029] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0030] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0031] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0032] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the system in use or operation, in addition to those depicted in the figure. For example, if the system in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both above and below orientations.

[0033] The HPDI engine is a diesel-ignition, dual-fuel engine, comprising both fuel and gas supply systems. It uses natural gas as its primary fuel while maintaining the power, torque, and efficiency of a traditional diesel engine. During fuel injection, the dual-fuel engine requires a certain pressure balance between the two fuels, necessitating pressure regulation of both the fuel and gas systems. The fuel supply system in related technologies is similar in composition to that of a diesel engine, primarily consisting of a high-pressure fuel pump, common rail, and injectors. The natural gas supply system comprises a gas pressure regulating module, common rail, and injectors. The gas pressure regulating module automatically adjusts the gas rail pressure based on the fuel rail pressure via mechanical means, ensuring the gas rail pressure always follows the fuel rail pressure. However, using a gas pressure regulating module for pressure regulation means the gas rail pressure constantly fluctuates with the fuel rail pressure, making it impossible to decouple the fuel and gas rail pressures separately. It also prevents the independent adjustment of the fuel rail pressure to achieve better combustion.

[0034] In view of this, this embodiment provides a pressure regulation system, which aims to adjust the fuel rail pressure and gas rail pressure independently by setting a first regulation device, a second regulation device and a control device, thereby increasing the fuel pressure and improving the fuel combustion effect, thus solving the above-mentioned technical problems.

[0035] like Figures 1 to 2As shown, according to an embodiment of the present invention, a pressure regulation system is proposed for use in a dual-fuel engine. The pressure regulation system includes a first regulating device, a second regulating device, and a control device. The first regulating device includes a first detection element and a first regulating assembly for connection to the common fuel rail 1 of the dual-fuel engine. The first detection element is used to detect the actual fuel rail pressure within the common fuel rail 1. The second regulating device includes a second detection element and a second regulating assembly for connection to the common gas rail 2 of the dual-fuel engine. The second detection element is used to detect the actual gas rail pressure within the common gas rail 2. The second regulating assembly includes multiple buffer units, each of which is connected to the common gas rail 2. The control device includes an electronic control unit 17, which can send control signals to electronic control elements to control the operation of product modules containing electronic control elements. Specifically, the electronic control unit 17 is connected to the first detection element, the first adjustment component, the second detection element, and multiple buffer units. Based on the difference between the actual fuel rail pressure and the target fuel rail pressure, the electronic control unit 17 controls the first adjustment component to adjust the actual fuel rail pressure, and based on the difference between the actual gas rail pressure and the target gas rail pressure, controls the multiple buffer units to adjust the actual gas rail pressure. The electronic control unit 17 monitors and adjusts the actual fuel rail pressure in the common fuel rail 1 and the actual gas rail pressure in the common gas rail 2 in real time to ensure that the actual fuel rail pressure and the actual gas rail pressure are within a stable range.

[0036] The pressure regulation system of the present invention comprises a first regulating device, a second regulating device, and a control device. The first regulating device includes a first detection element and a first regulating component. The first detection element detects the actual fuel rail pressure of the common rail 1. The control device controls the first regulating component to regulate the actual fuel rail pressure based on the difference between the actual fuel rail pressure and the target fuel rail pressure value. The second regulating device includes a second detection element and multiple buffer units. The second detection element detects the actual gas rail pressure of the common rail 2. The control device controls the multiple buffer units to regulate the actual gas rail pressure based on the difference between the actual gas rail pressure and the target fuel rail pressure value. The pressure regulation system of the present invention decouples the fuel rail pressure and the gas rail pressure, allowing for independent regulation of both, thereby increasing fuel pressure and improving fuel combustion efficiency. Simultaneously, it eliminates the need for a gas pressure regulating module, reducing system complexity.

[0037] In some embodiments of the present invention, the pressure regulating device further includes a throttle detection component and a speed detection component. The throttle detection component includes an accelerator pedal 15 and a throttle sensor. The throttle sensor is electrically connected to the electronic control unit 17 and is used to acquire the throttle signal emitted by the accelerator pedal 15. The speed detection component includes a phase sensor 16, which is electrically connected to the electronic control unit 17. The phase sensor 16 is a sensor for detecting the engine valve timing. By detecting the camshaft position angle, it determines the engine ignition timing and acquires the speed signal.

[0038] In some embodiments of the present invention, the first detection element includes a first pressure sensor 9, which is disposed on the common rail 1. The first adjustment assembly includes a first pump body 10 and a fuel tank 11, with the first pump body 10 connected to both the fuel tank 11 and the common rail 1. Specifically, the first pressure sensor 9 is disposed on and connected to the common rail 1. The outlet of the fuel tank 11 is connected to the inlet of the first pump body 10, and the outlet of the first pump body 10 is connected to the fuel inlet of the common rail 1. The outlet of the common rail 1 is connected to the engine nozzle 22. The first pump body 10 is a high-pressure fuel pump, which can increase fuel pressure. By pressurizing the fuel to a high-pressure state, high-pressure fuel injection and atomization are achieved, thereby improving the atomization quality of the fuel and enabling more complete combustion. It also controls the fuel output, generates fuel pressure within the common rail, and ensures normal engine operation. When the engine is running, the electronic control unit 17 determines the engine's operating conditions based on the throttle signal (obtained from the accelerator pedal 15) and the engine speed signal (obtained from the phase sensor 16). According to these operating conditions, it controls the pumping volume of the first pump body 10 to establish high-pressure diesel fuel in the common fuel rail 1. The first pressure sensor 9 monitors the actual fuel rail pressure in the common fuel rail 1 in real time and feeds this pressure back to the electronic control unit 17. The electronic control unit 17 compares this actual fuel rail pressure with a preset target value and controls the first pump body 10 to maintain the actual fuel rail pressure at the target value. The electronic control unit 17 monitors and adjusts the actual fuel rail pressure in the common fuel rail 1 in real time to ensure that the actual fuel rail pressure remains within a stable range.

[0039] In some embodiments of the present invention, the second regulating component further includes a second pump body 12 and a gas tank 13. Both ends of the second pump body 12 are connected to the gas tank 13 and the common gas rail 2, respectively. Multiple buffer units are disposed between the gas tank 13 and the common gas rail 2. The second detection element includes a second pressure sensor 14, which is disposed on the common gas rail 2. Specifically, the second pressure sensor 14 is disposed on and connected to the common gas rail 2. The outlet of the gas tank 13 is connected to the inlet of the second pump body 12, the outlet of the second pump body 12 is connected to the air inlet of the common gas rail 2, and the outlet of the common gas rail 2 is connected to the engine nozzle 22. The second pump body 12 is a gas booster pump, capable of increasing the input pressure of the gas to the operating pressure required by the equipment, thereby increasing the gas pressure and thus improving the gas combustion efficiency. When the gas pressure is regulated, the gas in the gas tank 13 is pressurized by the second pump body 12 to obtain high-pressure gas. The second pressure sensor 14 detects the actual gas rail pressure in the common gas pipe 2 in real time and feeds the actual gas rail pressure back to the electronic control unit 17. The electronic control unit 17 compares the actual gas rail pressure with the preset gas rail pressure target value and controls the second pump body 12 to control the actual gas rail pressure so that the actual gas rail pressure reaches the gas rail pressure target value.

[0040] In some embodiments of the present invention, each buffer unit includes a buffer gas tank and a control valve connected to the outlet of the buffer gas tank. Multiple buffer gas tanks are respectively provided with gas, and the pressure values ​​of the gas in the multiple buffer gas tanks correspond to different gas rail pressure target values. Multiple control valves are connected to respective control devices. Specifically, as... Figure 1 and 2As shown, there are three buffer units: a first buffer unit, a second buffer unit, and a third buffer unit. The first buffer unit includes a first buffer gas tank 3 and a first control valve 4. The outlet of the first buffer gas tank 3 is connected to the inlet of the common gas rail 2. The first control valve 4 is electrically connected to an electronic control unit 17, which controls the opening and closing of the first buffer gas tank 3. The first buffer gas tank 3 is filled with low-pressure gas, with a pressure range of 175 bar to 185 bar. The second buffer unit includes a second buffer gas tank 5 and a second control valve 6. The outlet of the second buffer gas tank 5 is connected to the inlet of the common gas rail 2. The second control valve 6 is electrically connected to the electronic control unit 17, which controls the opening and closing of the second buffer gas tank 5. The second buffer tank 5 is filled with medium-pressure gas, with a pressure range of 235 bar to 245 bar. The third buffer unit includes a third buffer gas tank 7 and a third control valve 8. The outlet of the third buffer gas tank 7 is connected to the inlet of the common gas rail 2. The third control valve 8 is electrically connected to an electronic control unit 17, which controls the opening and closing of the third buffer gas tank 7. The third buffer gas tank 7 is filled with high-pressure gas, with a pressure range of 295 bar to 305 bar. The electronic control unit 17 monitors and adjusts the actual gas rail pressure in the common gas rail 2 in real time to ensure that the actual gas rail pressure is within a stable range. By setting up the first, second, and third buffer units, different gas rail pressure target values ​​can be achieved according to... Figure 2 By adjusting the actual gas rail pressure in zones, the pressure fluctuation of the gas can be reduced, the difficulty of gas adjustment can be reduced, and the energy consumption of the second pump body 12 can also be effectively reduced.

[0041] Specifically, such as Figure 2 As shown, during startup, after establishing the fuel rail pressure, the first control valve 4 is opened, and the actual gas rail pressure is P1. When (P1-180) bar < -5 bar, that is, when the difference between P1 and 180 bar is less than -5 bar, the electronic control unit 17 controls the second pump body 12 to work, and controls the actual gas rail pressure within the range of 175 bar-185 bar.

[0042] When the load is increased, if the target value of the gas rail pressure is from Figure 2When the gas rail pressure changes from zone 3 to zone 2, the first control valve 4 is closed and the second control valve 6 is opened. The actual gas rail pressure is P2. When (P2-240) bar < -5 bar, that is, when the difference between P2 and 240 bar is less than -5 bar, the electronic control unit 17 controls the second pump body 12 to start, controlling the actual gas rail pressure within the range of 235 bar-245 bar. If the target gas rail pressure changes from zone 3 to zone 1, the electronic control unit 17 controls the first control valve 4 to close and the third control valve 8 to open. The actual gas rail pressure is P3. When (P3-300) bar < -5 bar, that is, when the difference between P2 and 240 bar is less than -5 bar, the actual gas rail pressure is P3. When the difference between 300 bar and 300 bar is less than -5 bar, the electronic control unit 17 controls the second pump body 12 to start, controlling the actual gas rail pressure within the range of 295 bar to 305 bar. If the target value of the gas rail pressure changes from region 2 to region 1, the electronic control unit 17 controls the second control valve 6 to close and the third control valve 8 to open. The actual gas rail pressure is P4. When (P4-300) bar < -5 bar, that is, when the difference between P4 and 300 bar is less than -5 bar, the electronic control unit 17 controls the second pump body 12 to start, controlling the actual gas rail pressure within the range of 295 bar to 305 bar.

[0043] When reducing load, if the target value of the gas rail pressure is from Figure 2 In zone 1 to zone 2, the third control valve 8 is closed and the second control valve 6 is opened. The actual gas rail pressure is P5. When (P5-240) bar < -5 bar, that is, when the difference between P5 and 240 bar is less than -5 bar, the electronic control unit 17 controls the second pump body 12 to start, controlling the actual gas rail pressure within the range of 235 bar-245 bar. If the target gas rail pressure value changes from zone 1 to zone 3, the electronic control unit 17 controls the third control valve 8 to close and the first control valve 4 to open. The actual gas rail pressure is P6. When (P6-180) bar < -5 bar, that is, when the difference between P5 and 240 bar is less than -5 bar, the actual gas rail pressure is P6. When the difference between 180 bar and 180 bar is less than -5 bar, the electronic control unit 17 controls the second pump body 12 to start, and controls the actual gas rail pressure within the range of 175 bar to 185 bar. If the target value of the gas rail pressure changes from region 2 to region 3, the electronic control unit 17 controls the second control valve 6 to close and the first control valve 4 to open. The actual gas rail pressure is P7. When (P7-180) bar < -5 bar, that is, when the difference between P7 and 180 bar is less than -5 bar, the electronic control unit 17 controls the second pump body 12 to start, and controls the actual gas rail pressure within the range of 175 bar to 185 bar.

[0044] When the engine stops, the second pump body 12 does not work, the electronic control unit 17 controls the first control valve 4, the second control valve 6 and the third control valve 8 to close, stop fuel injection, the nozzle 22 injects gas without fuel, reduces the pressure in the common rail 2, and the engine stops.

[0045] In some embodiments of the present invention, the pressure regulating device further includes a first filter 18 and a second filter 19. The first filter 18 is disposed upstream of the fuel common rail 1 and communicates with the fuel common rail 1, and the second filter 19 is disposed in the gas common rail 2 and communicates with the gas common rail 2. Specifically, the inlet of the first filter 18 is communicated with the outlet of the first pump body 10, and the outlet of the first filter 18 is communicated with the fuel inlet of the fuel common rail 1. By providing the first filter 18 at the fuel inlet of the fuel common rail 1, the fuel entering the fuel common rail 1 can be filtered to prevent particulate matter, water, and impurities in the fuel from clogging the nozzle 22, ensuring that the precision components of the fuel system are protected from wear and other damage, reducing mechanical wear, ensuring stable engine operation, and improving reliability. The inlet of the second filter 19 is connected to the outlet of the second pump body 12, and the outlet of the second filter 19 is connected to the air inlet of the common rail 2. By installing the second filter 19 at the air inlet of the common rail 2, the gas entering the common rail 1 can be filtered to prevent particulate matter, water and impurities in the gas from clogging the nozzle 22, ensuring that the precision components of the gas system are protected from wear and other damage, reducing mechanical wear, ensuring stable engine operation and improving reliability.

[0046] A second aspect of the present invention provides a dual-fuel engine, comprising an engine body and the aforementioned pressure regulating system. The engine body has a fuel common rail 1 and a gas common rail 2. A first regulating device is connected to the fuel common rail 1, and a second regulating device is connected to the fuel common rail 2. Specifically, the engine body is provided with an intake pipe 20 and an exhaust pipe 21. The engine body is also provided with a nozzle 22. The fuel outlet of the fuel common rail 1 and the gas outlet of the gas common rail 2 are both connected to the nozzle 22. The nozzle 22 injects liquid fuel and gaseous fuel into the engine combustion chamber, achieving efficient and clean combustion and ensuring stable operation of the vehicle. Of course, this dual-fuel engine also has the structures and components common to existing dual-fuel engines. Since this embodiment does not involve these structures and components, they will not be described in detail.

[0047] The dual-fuel engine of this invention uses a pressure regulation system to decouple the fuel rail pressure and the gas rail pressure, allowing for independent adjustment of both. This increases fuel pressure and improves combustion efficiency, while also eliminating the need for a separate gas pressure regulation module, reducing system complexity. Furthermore, zoned adjustment of the actual gas rail pressure reduces gas pressure fluctuations, simplifies gas adjustment, and effectively lowers the energy consumption of the second pump body 12.

[0048] A third aspect of the invention provides a pressure regulation method for pressure regulation in the aforementioned dual-fuel engine, such as... Figure 3 As shown, the pressure regulation method includes the following steps:

[0049] S100: Obtain the actual fuel rail pressure in the common rail 1. Based on the difference between the actual fuel rail pressure and the target fuel rail pressure value, the control device controls the first adjustment component to adjust the actual fuel rail pressure so that it reaches the target value. Specifically, the first pressure sensor 9 detects the actual fuel rail pressure in the common rail 1 in real time and feeds it back to the electronic control unit 17. The electronic control unit 17 compares the actual fuel rail pressure with the preset target fuel rail pressure value. If the difference between the actual fuel rail pressure and the target fuel rail pressure value exceeds the preset difference range, it controls the first pump body 10 to control the actual fuel rail pressure so that it reaches the target value.

[0050] S200: Obtain the actual gas rail pressure in the common gas rail 2. Based on the difference between the actual gas rail pressure and the target gas rail pressure value, the control device controls the second regulating component to adjust the actual gas rail pressure so that it reaches the target value. Specifically, the second pressure sensor 14 detects the actual gas rail pressure in the common gas rail 2 in real time and feeds it back to the electronic control unit 17. The electronic control unit 17 compares the actual gas rail pressure with the preset target gas rail pressure value. If the difference between the actual gas rail pressure and the target gas rail pressure value exceeds the preset difference range, the electronic control unit 17 controls the second pump body 12 to control the actual gas rail pressure so that it reaches the target value.

[0051] The pressure regulation method of the present invention regulates the engine pressure through a pressure regulation system, thereby decoupling the fuel rail pressure and the gas rail pressure. It allows for independent regulation of the fuel rail pressure and the gas rail pressure, thereby increasing the fuel pressure and improving the fuel combustion efficiency.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A pressure regulation system applied to a dual-fuel engine, characterized in that, include: The first adjustment device includes a first detection element and a first adjustment assembly for connecting to the common fuel rail of the dual-fuel engine. The first detection element is used to detect the actual fuel rail pressure in the common fuel rail. The second regulating device includes a second detection element and a second regulating assembly for connecting to the common gas rail of the dual-fuel engine. The second detection element is used to detect the actual gas rail pressure in the common gas rail. The second regulating assembly includes a plurality of buffer units, each of which is connected to the common gas rail. A control device is connected to the first detection element, the first adjustment component, the second detection element, and the plurality of buffer units. The control device controls the first adjustment component to adjust the actual fuel rail pressure based on the difference between the actual fuel rail pressure and the target fuel rail pressure value. The control device also controls the plurality of buffer units to adjust the actual gas rail pressure based on the difference between the actual gas rail pressure and the target gas rail pressure value. Each buffer unit includes a buffer gas tank and a control valve connected to the outlet of the buffer gas tank. The multiple buffer gas tanks are respectively provided with gas, and the pressure values ​​of the gas in the multiple buffer gas tanks correspond to different gas rail pressure target values. The multiple control valves are respectively connected to the control device.

2. The pressure regulating system according to claim 1, characterized in that, The first detection element includes a first pressure sensor, which is disposed on the fuel common rail. The first adjustment component includes a first pump body and a fuel tank, with the first pump body connected to the fuel tank and the fuel common rail respectively.

3. The pressure regulating system according to claim 1, characterized in that, The second regulating component also includes a second pump body and a gas tank. The two ends of the second pump body are respectively connected to the gas tank and the common rail gas pipeline, and a plurality of the buffer units are disposed between the gas tank and the common rail gas pipeline.

4. The pressure regulating system according to claim 1, characterized in that, The second detection element includes a second pressure sensor, which is disposed on the common rail gas pipe.

5. The pressure regulating system according to any one of claims 1 to 4, characterized in that, The pressure regulation system also includes a throttle detection component, which includes an accelerator pedal and a throttle sensor. The throttle sensor is electrically connected to the control device and is used to acquire the throttle signal emitted by the accelerator pedal.

6. The pressure regulating system according to any one of claims 1 to 4, characterized in that, The pressure regulation system also includes a speed detection component, which includes a phase sensor. The phase sensor is electrically connected to the control device and is used to acquire speed signals.

7. The pressure regulating system according to any one of claims 1 to 4, characterized in that, The pressure regulation system further includes a first filter and a second filter. The first filter is located upstream of the fuel common rail and is connected to the fuel common rail. The second filter is located on the gas common rail and is connected to the gas common rail.

8. A dual-fuel engine, characterized in that, The system includes an engine body and a pressure regulating system as described in any one of claims 1 to 7, wherein the engine body has a fuel common rail and a gas common rail, the first regulating device is connected to the fuel common rail, and the second regulating device is connected to the gas common rail.

9. A pressure regulation method, characterized in that, For pressure regulation of the dual-fuel engine as described in claim 8, the pressure regulation method includes the following steps: The control device obtains the actual fuel rail pressure of the fuel common rail and controls the first adjustment component to adjust the actual fuel rail pressure according to the difference between the actual fuel rail pressure and the target fuel rail pressure value, so that the actual fuel rail pressure reaches the target fuel rail pressure value. The control device obtains the actual gas rail pressure of the common gas rail pipe, and controls the second adjustment component to adjust the actual gas rail pressure according to the difference between the actual gas rail pressure and the target gas rail pressure value, so that the actual gas rail pressure reaches the target gas rail pressure value.

Images