CN118481847A - Pressure regulation system, dual fuel engine and pressure regulation method - Google Patents

Abstract

The present invention relates to the field of engine technology, and discloses a pressure regulating system, a dual-fuel engine and a pressure regulating method. The pressure regulating system comprises a first regulating device, a second regulating device and a control device. The first regulating device comprises a first detection member and a first regulating assembly. The first detection member detects the actual fuel rail pressure of the fuel common rail pipe. The control device controls the first regulating assembly to adjust the actual fuel rail pressure according to the difference between the actual fuel rail pressure and the target value of the fuel rail pressure. The second regulating device comprises a second detection member and a plurality of buffer units. The second detection member detects the actual fuel rail pressure of the gas common rail pipe. The control device controls the plurality of buffer units to adjust the actual gas rail pressure according to the difference between the actual gas rail pressure and the target value of the fuel rail pressure. The present invention realizes the decoupling of the fuel rail pressure and the gas rail pressure, and can adjust the fuel rail pressure and the gas rail pressure separately, thereby increasing the fuel pressure and improving the combustion effect.

Description

Pressure regulation system, dual fuel engine and pressure regulation method

Technical Field

The present invention relates to the technical field of engines, and in particular to a pressure regulating system, a dual-fuel engine and a pressure regulating method.

Background Art

This section merely provides background information related to the present disclosure and is not necessarily prior art.

The HPDI engine is a diesel-fueled diesel-gas dual-fuel engine. The engine includes two supply systems for fuel and gas. The engine uses natural gas as the main fuel, while ensuring the power, torque and efficiency of the original diesel engine. When the dual-fuel engine is injecting fuel, it is necessary to ensure that a certain pressure balance relationship is met between the two fuels, so the fuel system and the gas system need to be pressure-regulated.

The existing pressure regulating device includes a gas pressure regulating module, which is automatically adjusted according to the fuel rail pressure through a mechanical device. This adjustment method makes the gas rail pressure always change with the fuel rail pressure, and the fuel pressure cannot be increased alone. The low fuel pressure leads to low thermal efficiency and affects the engine performance.

Summary of the invention

The purpose of the present invention is to at least solve the problem that the existing dual-fuel engine pressure regulating device cannot regulate the fuel rail pressure and the gas rail pressure separately, which affects the engine performance. This purpose is achieved through the following technical solutions:

A first aspect of the present invention provides a pressure regulating system for a dual-fuel engine, comprising:

A first regulating device comprises a first detecting member and a first regulating assembly for being connected to a fuel common rail pipe of the dual-fuel engine, wherein the first detecting member is used to detect an actual fuel rail pressure in the fuel common rail pipe;

A second regulating device comprises a second detecting member and a second regulating assembly connected to the gas common rail pipe of the dual-fuel engine, wherein the second detecting member is used to detect an actual gas rail pressure in the gas common rail pipe, and the second regulating assembly comprises a plurality of buffer units, each of which is respectively connected to the gas common rail pipe;

a control device connected to the first detecting member, the first adjusting component, the second detecting member and the plurality of buffer units, wherein the control device controls the first adjusting component to adjust the actual fuel rail pressure according to a difference between the actual fuel rail pressure and a target fuel rail pressure value, and the control device controls the plurality of buffer units to adjust the actual gas rail pressure according to a difference between the actual gas rail pressure and a target gas rail pressure value.

The pressure regulating system of the present invention is provided with a first regulating device, a second regulating device and a control device. The first regulating device includes a first detection member and a first regulating assembly. The first detection member detects the actual fuel rail pressure of the fuel common rail pipe. The control device controls the first regulating assembly to adjust the actual fuel rail pressure according to the difference between the actual fuel rail pressure and the target value of the fuel rail pressure. The second regulating device includes a second detection member and a plurality of buffer units. The second detection member detects the actual gas rail pressure of the gas common rail pipe. The control device controls the plurality of buffer units to adjust the actual gas rail pressure according to the difference between the actual gas rail pressure and the target value of the fuel rail pressure. The pressure regulating system of the present invention realizes the decoupling of the fuel rail pressure and the gas rail pressure, and can adjust the fuel rail pressure and the gas rail pressure separately, thereby increasing the fuel pressure and improving the fuel combustion effect. At the same time, it can also realize the elimination of the gas pressure regulating module to reduce the complexity of the system.

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

In some embodiments of the present invention, each of the buffer units 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, and the multiple control valves are connected to the respective control devices.

In some embodiments of the present invention, the first detection component includes a first pressure sensor, which is arranged on the fuel common rail pipe. The first adjustment component includes a first pump body and a fuel tank, and the first pump body is connected to the fuel tank and the fuel common rail pipe respectively.

In some embodiments of the present invention, the second regulating assembly further 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 gas common rail pipe, and the plurality of buffer units are arranged between the gas tank and the gas common rail pipe.

In some embodiments of the present invention, the second detection component includes a second pressure sensor, and the second pressure sensor is arranged on the gas common rail pipe.

In some embodiments of the present invention, the pressure regulating device further includes a throttle detection component, which includes a throttle pedal and a throttle sensor. The throttle sensor is electrically connected to the control device for acquiring a throttle signal emitted by the throttle pedal.

In some embodiments of the present invention, the pressure regulating device further includes a rotation speed detection component, the rotation speed detection component includes a phase sensor, the phase sensor is electrically connected to the control device, and the phase sensor is used to obtain a rotation speed signal.

In some embodiments of the present invention, the pressure regulating device also includes a first filter and a second filter, the first filter is arranged upstream of the fuel common rail pipe and communicated with the fuel common rail pipe, and the second filter is arranged on the gas common rail pipe and communicated with the gas common rail pipe.

A second aspect of the present invention proposes a dual-fuel engine, comprising an engine body and a pressure regulating system as described in any one of the above items, wherein the engine body has a fuel common rail pipe and a gas common rail pipe, the first regulating device is connected to the fuel common rail pipe, and the second regulating device is connected to the fuel common rail pipe.

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

acquiring the actual fuel rail pressure of the fuel common rail pipe, and the control device controlling the first regulating component to regulate 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 actual gas rail pressure of the gas common rail pipe is obtained, and the control device controls the second regulating component to regulate the actual gas rail pressure according to the difference between the actual gas rail pressure and the target gas rail pressure, so that the actual gas rail pressure reaches the target gas rail pressure.

BRIEF DESCRIPTION OF THE DRAWINGS

Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

FIG1 schematically shows a schematic structural diagram of a pressure regulating system according to an embodiment of the present invention;

FIG2 schematically shows a schematic diagram of a gas rail set pressure area of a pressure regulating system according to an embodiment of the present invention;

FIG3 schematically shows a flow chart of a pressure regulation method according to an embodiment of the present invention.

The reference numerals are as follows:

1. Fuel common rail pipe; 2. Gas common rail pipe; 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 DESCRIPTION

The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and/or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and/or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the system in use or operation in addition to the orientation depicted in the figure. For example, if the system in the figure is flipped, then the elements described as "below other elements or features" or "below other elements or features" will 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.

The HPDI engine is a diesel-fueled diesel-gas dual-fuel engine ignited by diesel, and the engine includes two supply systems for fuel and gas. The engine uses natural gas as the main fuel, while ensuring the power, torque and efficiency of the original diesel engine. When the dual-fuel engine is performing fuel injection, it is necessary to ensure that a certain pressure balance relationship is met between the two fuels, so it is necessary to regulate the pressure of the fuel system and the gas system. In the related art, the fuel supply system component composition is similar to that of the diesel engine, mainly consisting of a high-pressure oil pump, a common rail pipe and an injector; the gas supply system includes a gas pressure regulating module, a common rail pipe and an injector. Among them, the gas pressure regulating module is automatically adjusted by a mechanical device according to the fuel rail pressure to ensure that the gas rail pressure always follows the fuel rail pressure. However, the use of the gas pressure regulating module for pressure regulation makes the gas rail pressure always change with the fuel rail pressure, and the fuel rail pressure and the gas rail pressure cannot be decoupled, the fuel rail pressure and the gas rail pressure cannot be adjusted separately, and the fuel rail pressure cannot be increased alone to obtain a better combustion effect.

In view of this, the present embodiment provides a pressure regulating system, which aims to separately regulate the fuel rail pressure and the gas rail pressure by setting a first regulating device, a second regulating device and a control device, thereby increasing the fuel pressure and improving the fuel combustion effect, thereby solving the above technical problems.

As shown in Figures 1 and 2, according to an embodiment of the present invention, a pressure regulating system is proposed, which is applied to a dual-fuel engine. The pressure regulating system includes a first regulating device, a second regulating device and a control device. The first regulating device includes a first detection member and a first regulating assembly for connecting to a fuel common rail pipe 1 of the dual-fuel engine, and the first detection member is used to detect the actual fuel rail pressure in the fuel common rail pipe 1; the second regulating device includes a second detection member and a second regulating assembly for connecting to a gas common rail pipe 2 of the dual-fuel engine, and the second detection member is used to detect the actual gas rail pressure in the gas common rail pipe 2, and the second regulating assembly includes a plurality of buffer units, each of which is respectively connected to the gas common rail pipe 2; the control device includes an electronic control unit 17, and the electronic control unit 17 can send a control signal to the electronic control element to control the operation of the product module containing the electronic control element. Specifically, the electronic control unit 17 is connected to the first detection member, the first adjustment component, the second detection member and the plurality of buffer units. The electronic control unit 17 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, and controls the plurality of buffer units to adjust the actual gas rail pressure according to the difference between the actual gas rail pressure and the target gas rail pressure. The electronic control unit 17 monitors and adjusts the actual fuel rail pressure in the fuel common rail pipe 1 and the actual gas rail pressure in the gas common rail pipe 2 in real time to ensure that the actual fuel rail pressure and the actual gas rail pressure are within a stable range.

The pressure regulating system of the present invention is provided with a first regulating device, a second regulating device and a control device. The first regulating device includes a first detection member and a first regulating assembly. The first detection member detects the actual fuel rail pressure of the fuel common rail pipe 1. The control device controls the first regulating assembly to adjust the actual fuel rail pressure according to the difference between the actual fuel rail pressure and the target value of the fuel rail pressure. The second regulating device includes a second detection member and a plurality of buffer units. The second detection member detects the actual gas rail pressure of the gas common rail pipe 2. The control device controls the plurality of buffer units to adjust the actual gas rail pressure according to the difference between the actual gas rail pressure and the target value of the fuel rail pressure. The pressure regulating system of the present invention realizes the decoupling of the fuel rail pressure and the gas rail pressure, and can adjust the fuel rail pressure and the gas rail pressure separately, thereby increasing the fuel pressure and improving the fuel combustion effect. At the same time, it can also realize the elimination of the gas pressure regulating module to reduce the complexity of the system.

In some embodiments of the present invention, the pressure regulating device further includes a throttle detection component and a speed detection component, wherein the throttle detection component includes a throttle pedal 15 and a throttle sensor, and the throttle sensor is electrically connected to the electronic control unit 17, and is used to obtain a throttle signal sent by the throttle pedal 15. The speed detection component includes a phase sensor 16, and the phase sensor 16 is electrically connected to the electronic control unit 17. The phase sensor 16 is a sensor for detecting the engine valve timing, and the engine ignition timing is judged and the speed signal is obtained by detecting the camshaft position angle.

In some embodiments of the present invention, the first detection member includes a first pressure sensor 9, which is arranged on the fuel common rail pipe 1, and the first adjustment assembly includes a first pump body 10 and a fuel tank 11, and the first pump body 10 is connected to the fuel tank 11 and the fuel common rail pipe 1 respectively. Specifically, the first pressure sensor 9 is arranged on the fuel common rail pipe 1 and is connected to the fuel common rail pipe 1, the outlet of the fuel tank 11 is connected to the inlet of the first pump body 10, the outlet of the first pump body 10 is connected to the fuel inlet of the fuel common rail pipe 1, and the outlet of the fuel common rail pipe 1 is connected to the nozzle 22 of the engine. The first pump body 10 is a high-pressure oil pump, which can increase the fuel pressure, and realize the high-pressure injection and atomization effect of the fuel by pressurizing the fuel to a high-pressure state, thereby improving the atomization quality of the fuel and enabling the fuel to burn more fully; controlling the fuel output, generating fuel pressure in the common rail pipe, and ensuring the normal operation of the engine. When the engine is running, the electronic control unit 17 determines the operating condition of the engine according to the throttle signal and the engine speed signal, the throttle signal is obtained by the accelerator pedal 15, and the engine speed signal is obtained by the phase sensor 16, and controls the pumping amount of the first pump body 10 according to the specific operating condition, and establishes high-pressure diesel in the fuel common rail pipe 1. The first pressure sensor 9 detects the actual fuel rail pressure in the fuel common rail pipe 1 in real time, and feeds the actual fuel rail pressure back to the electronic control unit 17. The electronic control unit 17 compares the actual fuel rail pressure with the preset fuel rail pressure target value, and controls the first pump body 10 to control the actual fuel rail pressure so that the actual fuel rail pressure reaches the fuel rail pressure target value. The electronic control unit 17 monitors and adjusts the actual fuel rail pressure in the fuel common rail pipe 1 in real time to ensure that the actual fuel rail pressure is within a stable range.

In some embodiments of the present invention, the second regulating assembly further includes a second pump body 12 and a gas tank 13, the two ends of the second pump body 12 are respectively connected to the gas tank 13 and the gas common rail pipe 2, and a plurality of buffer units are arranged between the gas tank 13 and the gas common rail pipe 2; the second detection part includes a second pressure sensor 14, and the second pressure sensor 14 is arranged on the gas common rail pipe 2. Specifically, the second pressure sensor 14 is arranged on the gas common rail pipe 2 and is connected to the gas common rail pipe 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 gas common rail pipe 2, and the outlet of the gas common rail pipe 2 is connected to the nozzle 22 of the engine. The second pump body 12 is a gas booster pump, which can increase the input pressure of the gas to the working pressure required by the equipment, and can increase the gas pressure, thereby improving the gas combustion efficiency. When the gas pressure is adjusted, 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 gas common rail pipe 2 in real time, and feeds back the actual gas rail pressure 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.

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, and multiple control valves are connected to the respective control devices. Specifically, as shown in Figures 1 and 2, the number of buffer units is three, namely the first buffer unit, the second buffer unit and the 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 air inlet of the gas common rail pipe 2, the first control valve 4 is electrically connected to the electronic control unit 17, and the electronic control unit 17 is used to control the first control valve 4 to open/close the first buffer gas tank 3, and the first buffer gas tank 3 is filled with low-pressure gas, and the pressure range of the low-pressure gas is 175bar-185bar. 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 air inlet of the gas common rail pipe 2. The second control valve 6 is electrically connected to the electronic control unit 17. The electronic control unit 17 is used to control the second control valve 6 to open/close the second buffer gas tank 5. The second buffer gas tank 5 is filled with medium-pressure gas, and the pressure range of the medium-pressure gas is 235bar-245bar. 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 air inlet of the gas common rail pipe 2. The third control valve 8 is electrically connected to the electronic control unit 17. The electronic control unit 17 is used to control the third control valve 8 to open/close the third buffer gas tank 7. The third buffer gas tank 7 is filled with high-pressure gas, and the pressure range of the high-pressure gas is 295bar-305bar. The electronic control unit 17 monitors and adjusts the actual gas rail pressure in the gas common rail pipe 2 in real time to ensure that the actual gas rail pressure is within a stable range. By setting the first buffer unit, the second buffer unit and the third buffer unit, the actual gas rail pressure can be adjusted in different zones according to FIG. 2 according to different gas rail pressure target values, which can reduce the pressure fluctuation of the gas, reduce the difficulty of gas adjustment, and effectively reduce the energy consumption of the second pump body 12.

Specifically, as shown in FIG. 2 , at startup, the fuel rail pressure is first established, and then the first control valve 4 is opened. The actual gas rail pressure is P1. When (P1-180) bar<–5 bar, that is, 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.

When the load is added, if the target value of the gas rail pressure changes from area 3 to area 2 in Figure 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, 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 and control the actual gas rail pressure within the range of 235 bar-245 bar; if the target value of the gas rail pressure changes from area 3 to area 1, the electronic control unit 17 controls the first control valve 4 to close and opens the third control valve 8. The actual gas rail pressure is P3. When (P3-300) bar<–5 bar, the actual gas rail pressure is P4. When ar, that is, the difference between P3 and 300bar is less than -5bar, the electronic control unit 17 controls the second pump body 12 to start, and the actual gas rail pressure is controlled within the range of 295bar-305bar; if the target value of the gas rail pressure changes from area 2 to area 1, the electronic control unit 17 controls the second control valve 6 to close, and opens the third control valve 8, and the actual gas rail pressure is P4. When (P4-300)bar<-5bar, that is, the difference between P4 and 300bar is less than -5bar, the electronic control unit 17 controls the second pump body 12 to start, and the actual gas rail pressure is controlled within the range of 295bar-305bar.

When the load is reduced, if the target value of the gas rail pressure changes from area 1 to area 2 in Figure 2, the third control valve 8 is closed, the second control valve 6 is opened, and the actual gas rail pressure is P5. When (P5-240) bar<–5 bar, that is, 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 and control the actual gas rail pressure within the range of 235 bar-245 bar; if the target value of the gas rail pressure changes from area 1 to area 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, the second pump body 12 is started and the actual gas rail pressure is controlled within the range of 235 bar-245 bar. When ar, that is, when the difference between P6 and 180bar is less than -5bar, the electronic control unit 17 controls the second pump body 12 to start, and controls the actual gas rail pressure within the range of 175bar-185bar; if the target value of the gas rail pressure changes from area 2 to area 3, the electronic control unit 17 controls the second control valve 6 to close, and opens the first control valve 4, and the actual gas rail pressure is P7. When (P7-180)bar<-5bar, that is, when the difference between P7 and 180bar is less than -5bar, the electronic control unit 17 controls the start of the second pump body 12 to control the actual gas rail pressure within the range of 175bar-185bar.

When the vehicle is stopped, 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 injecting fuel, and the nozzle 22 injects gas in vain to reduce the pressure in the gas common rail pipe 2, and the engine stops.

In some embodiments of the present invention, the pressure regulating device further includes a first filter 18 and a second filter 19, wherein the first filter 18 is disposed upstream of the fuel common rail pipe 1 and communicated with the fuel common rail pipe 1, and the second filter 19 is disposed at the gas common rail pipe 2 and communicated with the gas common rail pipe 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 oil inlet of the fuel common rail pipe 1. By disposing the first filter 18 at the oil inlet of the fuel common rail pipe 1, the fuel entering the fuel common rail pipe 1 can be filtered to prevent particulate matter, water and debris in the fuel from clogging the nozzle 22, thereby protecting the precision components of the fuel system from wear and other damage, reducing mechanical wear, ensuring stable operation of the engine, and improving reliability. The inlet of the second filter 19 is communicated with the outlet of the second pump body 12, and the outlet of the second filter 19 is communicated with the air inlet of the fuel common rail pipe 2. By arranging the second filter 19 at the air inlet of the fuel common rail pipe 2, the fuel gas entering the fuel common rail pipe 1 can be filtered to prevent particulate matter, water and debris in the fuel gas from clogging the nozzle 22, thereby protecting the precision parts of the fuel system from wear and other damages, reducing mechanical wear, ensuring stable operation of the engine, and improving reliability.

The second aspect of the present invention proposes a dual-fuel engine, including an engine body and the above-mentioned pressure regulating system, the engine body has a fuel common rail pipe 1 and a gas common rail pipe 2, the first regulating device is connected to the fuel common rail pipe 1, and the second regulating device is connected to the fuel common rail pipe 2. Specifically, the engine body is provided with an intake pipe 20 and an exhaust pipe 21, and a nozzle 22 is also provided on the engine body. The oil outlet of the fuel common rail pipe 1 and the gas outlet of the gas common rail pipe 2 are both connected to the nozzle 22. The nozzle 22 sprays liquid fuel and gas fuel into the engine combustion chamber to achieve efficient and clean combustion of the engine and ensure stable operation of the whole vehicle. Of course, the dual-fuel engine also has the structures and components that all existing dual-fuel engines have. Since these structures and components are not involved in this embodiment, they are not described in detail.

The dual-fuel engine of the present invention regulates the pressure through the pressure regulating system, realizes the 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 increasing the fuel pressure and improving the fuel combustion effect. At the same time, it can also achieve the elimination of the gas pressure regulating module to reduce the complexity of the system. In addition, the actual gas rail pressure is regulated in different areas, which can reduce the pressure fluctuation of the gas, reduce the difficulty of gas adjustment, and effectively reduce the energy consumption of the second pump body 12.

The third aspect of the present invention provides a pressure regulation method for regulating the pressure of the dual-fuel engine. As shown in FIG3 , the pressure regulation method comprises the following steps:

S100: The actual fuel rail pressure of the fuel common rail pipe 1 is obtained. The control device controls the first regulating component to regulate the actual fuel rail pressure according to the difference between the actual fuel rail pressure and the target fuel rail pressure, so that the actual fuel rail pressure reaches the target fuel rail pressure. Specifically, the actual fuel rail pressure in the fuel common rail pipe 1 is detected in real time by the first pressure sensor 9, and the actual fuel rail pressure is fed 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. If the difference between the actual fuel rail pressure and the target fuel rail pressure exceeds the preset difference range, the first pump body 10 is controlled to control the actual fuel rail pressure so that the actual fuel rail pressure reaches the target fuel rail pressure.

S200: The actual gas rail pressure of the gas common rail pipe 2 is obtained. The control device controls the second regulating component to regulate 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. Specifically, the second pressure sensor 14 detects the actual gas rail pressure in the gas common rail pipe 2 in real time, and feeds back the actual gas rail pressure 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 the actual gas rail pressure reaches the target gas rail pressure value.

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. The fuel rail pressure and the gas rail pressure can be regulated separately, thereby increasing the fuel pressure and improving the fuel combustion effect.

The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A pressure regulating system for a dual fuel engine, comprising:

The first adjusting device comprises a first detecting piece and a first adjusting component, wherein the first detecting piece and the first adjusting component are used for being connected with a fuel common rail pipe of the dual-fuel engine, and the first detecting piece is used for detecting actual fuel rail pressure in the fuel common rail pipe;

The second adjusting device comprises a second detecting piece and a second adjusting component, wherein the second detecting piece is used for being connected with a gas common rail pipe of the dual-fuel engine, the second detecting piece is used for detecting actual gas rail pressure in the gas common rail pipe, the second adjusting component comprises a plurality of buffer units, and each buffer unit is respectively connected with the gas common rail pipe;

The control device is connected with the first detection part, the first adjusting component, the second detection part and the buffer units, and is used for controlling the first adjusting component to adjust the actual fuel rail pressure according to the difference value between the actual fuel rail pressure and the fuel rail pressure target value, and controlling the buffer units to adjust the actual fuel rail pressure according to the difference value between the actual fuel rail pressure and the fuel rail pressure target value.

2. The pressure regulating system according to claim 1, wherein each of the buffer units includes a buffer gas tank and a control valve connected to an outlet of the buffer gas tank, a plurality of the buffer gas tanks are respectively provided with gas therein, and pressure values of the gas in the plurality of buffer gas tanks correspond to different gas rail pressure target values, and the plurality of the control valves are connected to the respective control devices.

3. The pressure regulating system of claim 1, wherein the first sensing element comprises a first pressure sensor disposed in the fuel rail, and the first regulating assembly comprises a first pump body and a fuel tank, the first pump body in communication with the fuel tank and the fuel rail, respectively.

4. The pressure regulating system of claim 1, wherein the second regulating assembly further comprises a second pump body and a gas tank, both ends of the second pump body are respectively communicated with the gas tank and the gas common rail pipe, and a plurality of the buffer units are disposed between the gas tank and the gas common rail pipe.

5. The pressure regulating system of claim 1, wherein the second sensing element comprises a second pressure sensor disposed on the gas common rail.

6. The pressure regulating system of any one of claims 1 to 5, wherein the pressure regulating device further comprises a throttle detection assembly comprising a throttle pedal and a throttle sensor electrically connected to the control device for acquiring a throttle signal from the throttle pedal.

7. The pressure regulating system of any one of claims 1 to 5, wherein the pressure regulating device further comprises a rotational speed detection assembly comprising a phase sensor electrically connected to the control device, the phase sensor for acquiring a rotational speed signal.

8. The pressure regulating system of any one of claims 1 to 5, wherein the pressure regulating device further comprises a first filter disposed upstream of and in communication with the fuel common rail pipe and a second filter disposed in communication with the fuel common rail pipe.

9. A dual fuel engine comprising an engine block and a pressure regulating system as claimed in any one of claims 1 to 8, the engine block having a fuel rail and a gas rail, the first regulating means being connected to the fuel rail and the second regulating means being connected to the fuel rail.

10. A pressure regulating method for a dual fuel engine as claimed in claim 9, the pressure regulating method comprising the steps of:

The actual fuel rail pressure of the fuel common rail pipe is obtained, and the control device controls the first adjusting component to adjust the actual fuel rail pressure according to the difference value between the actual fuel rail pressure and a fuel rail pressure target value so that the actual fuel rail pressure reaches the fuel rail pressure target value;

The actual gas rail pressure of the gas common rail pipe is obtained, and the control device controls the second adjusting assembly to adjust the actual gas rail pressure according to the difference value between the actual gas rail pressure and the gas rail pressure target value so that the actual gas rail pressure reaches the gas rail pressure target value.