Dual-fuel oil injector and control method

Abstract

The invention relates to the technical field of engine fuel injection, and discloses a dual-fuel oil injector and a control method.The dual-fuel oil injector is characterized in that an oil injector body is provided with a gas path and an oil path, the gas path is used for conveying gas fuel, and the oil path is used for conveying fuel; the hydraulic mechanism comprises a first hydraulic circulation assembly and a second hydraulic circulation assembly, the first hydraulic circulation assembly is communicated with the gas path, and the second hydraulic circulation assembly is communicated with the oil path; the driving mechanism is connected with the first hydraulic circulation assembly and the second hydraulic circulation assembly, so that hydraulic oil in the first hydraulic circulation assembly and the second hydraulic circulation assembly can circularly flow, simultaneous injection and independent injection of two different types of fuel can be achieved, higher fuel selection flexibility is provided for a user, and the fuel injection efficiency is improved. And the engine can stably operate under different fuel supply conditions.

Description

Technical Field

[0001] The invention relates to the technical field of engine fuel injection, and in particular to a dual-fuel injector and a control method thereof. Background Art

[0002] The injector is an important component for fuel injection in the engine fuel supply system. It is also the most critical and complex component in the electronic common rail system, and the component with the most difficult process. According to the characteristics of the diesel engine mixture formation, the injector atomizes the fuel into fine oil droplets and sprays it into a specific part of the combustion chamber. It is mainly composed of a fuel injection nozzle and an injector body. The position and angle of installation on the cylinder head depends on the design of the combustion chamber. The injector receives the injection pulse signal sent by the electronic control unit and accurately controls the amount of fuel injection. The spray characteristics of the injector include atomization particle size, oil mist distribution, oil beam direction, range and diffusion cone angle, etc. These characteristics should meet the requirements of the internal combustion engine combustion system to make the mixture formation and combustion perfect, and obtain higher power and thermal efficiency.

[0003] However, at present, the injectors commonly used in internal combustion engines can only spray one fuel. But if two injectors with different fuels are installed in the cylinder in order to achieve the dual-fuel mode, this may involve many technical difficulties. The sprays of the two injectors may interfere with each other, resulting in a decrease in the quality of the oil-gas mixture. Summary of the invention

[0004] The object of the present invention is to provide a dual-fuel injector and a control method, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a dual-fuel injector, comprising:

[0006] The fuel injector body is provided with an air circuit and an oil circuit, wherein the air circuit is used to transport gas fuel and the oil circuit is used to transport fuel oil;

[0007] The hydraulic mechanism comprises a first hydraulic circulation component and a second hydraulic circulation component, wherein the first hydraulic circulation component is connected to the gas circuit, and the second hydraulic circulation component is connected to the oil circuit;

[0008] a driving mechanism connected to the first hydraulic circulation assembly and the second hydraulic circulation assembly so as to enable the hydraulic oil in the first hydraulic circulation assembly and the second hydraulic circulation assembly to circulate;

[0009] Wherein, when the first hydraulic circulation component is in a closed circuit state, the hydraulic oil in the first hydraulic circulation component can drive the gas circuit to be in a passage state, and when the first hydraulic circulation component is in a passage state, the hydraulic oil in the first hydraulic circulation component circulates to make the gas circuit in a closed circuit state;

[0010] When the second hydraulic circulation component is in a closed-circuit state, the hydraulic oil in the second hydraulic circulation component can drive the oil circuit to be in a passage state. When the second hydraulic circulation component is in a passage state, the hydraulic oil in the second hydraulic circulation component circulates to make the oil circuit in a closed-circuit state.

[0011] Optionally, the gas circuit includes:

[0012] a first on-off assembly, connected to the first hydraulic circulation assembly;

[0013] A gas channel, connected to the first on-off component;

[0014] An air filling cavity, connected to an end of the gas passage away from the first on-off assembly;

[0015] A plurality of gas spray holes are communicated with the inflation cavity.

[0016] Optionally, the first on-off component includes:

[0017] a first pressurized cabin, connected to the gas channel and the first hydraulic circulation assembly;

[0018] An air inlet plate, arranged above the first pressurized cabin;

[0019] A gas path plug is slidably disposed in the first pressurized cabin, and a connecting passage is provided on the gas path plug. When the gas path plug slides, the air inlet plate and the gas channel can be switched between an on-off state through the connecting passage;

[0020] A first stabilizing spring has one end fixedly connected to the end surface of the first pressurized cabin away from the air inlet plate, and the other end fixedly connected to the air path plug via a first piezoelectric ceramic sheet.

[0021] Optionally, the first hydraulic circulation component includes:

[0022] A first pressure supply cylinder connected to the driving mechanism;

[0023] a first oil inlet check valve, one end of which is connected to the first pressure supply cylinder and the other end of which is connected to the first pressurization cabin;

[0024] A first electromagnetic balancing valve, one end of which is connected to the first pressurized cabin;

[0025] A first liquid storage chamber connected to an end of the first electromagnetic balance valve away from the first pressurized chamber;

[0026] A first oil return check valve has one end connected to the first liquid storage chamber and the other end connected to the first pressure supply cylinder.

[0027] Optionally, the oil circuit includes:

[0028] a second on-off assembly, connected to the second hydraulic circulation assembly;

[0029] A plurality of fuel injection holes are connected to the second on-off assembly.

[0030] Optionally, the second on-off component includes:

[0031] The needle valve channel comprises an upper chamber, a lower oil channel and a pressure chamber which are connected in sequence, and the pressure chamber is connected to the plurality of fuel injection holes;

[0032] An oil inlet channel communicated with the upper chamber;

[0033] a second pressurized cabin, in communication with the upper chamber;

[0034] A needle valve plug is slidably disposed in the needle valve channel, and when the needle valve plug slides, the oil inlet channel and the pressure chamber can be switched between an on-off state;

[0035] A second stabilizing spring has one end connected to the needle valve plug, and the other end connected to an end of the second pressurizing chamber away from the upper chamber through a second piezoelectric ceramic sheet.

[0036] Optionally, the second hydraulic circulation component includes:

[0037] a second pressure supply cylinder connected to the driving mechanism;

[0038] a second oil inlet check valve, one end of which is connected to the second pressure supply cylinder and the other end of which is connected to the upper chamber;

[0039] A second electromagnetic balancing valve, one end of which is connected to the upper chamber;

[0040] A second liquid storage chamber connected to an end of the second electromagnetic balance valve away from the upper chamber;

[0041] A second oil return check valve has one end connected to the second liquid storage chamber and the other end connected to the second pressure supply cylinder.

[0042] Optionally, the angle between the axis of the gas spray hole and the axis of the injector body is 65°.

[0043] Optionally, the angle between the axis of the fuel spray hole and the axis of the injector body is 70°.

[0044] A control method for a dual-fuel injector, comprising:

[0045] Dual-fuel injection mode: the first hydraulic circulation component and the second hydraulic circulation component are controlled to be in a closed-circuit state, and the driving mechanism drives the hydraulic oil to flow along the first hydraulic circulation component and the second hydraulic circulation component, so that the gas circuit and the oil circuit are both in a passage state, for the transportation of gas fuel and fuel oil.

[0046] Single fuel injection mode: control one of the first hydraulic circulation component and the second hydraulic circulation component to be in a closed circuit state and the other to be in a passage state, and the driving mechanism drives the hydraulic oil to flow along the first hydraulic circulation component and the second hydraulic circulation component, so that one of the gas circuit and the oil circuit is in a closed circuit state and the other is in a passage state, so as to transport gas fuel or fuel oil.

[0047] The present invention discloses the following technical effects:

[0048] 1. By setting up independent gas circuits and oil circuits, and by controlling the passage and closed-circuit state of the first hydraulic circulation component and the second hydraulic circulation component, it is possible to control the passage and closed-circuit state of the gas circuit and the oil circuit respectively, so that the simultaneous injection and separate injection of two different types of fuels by the gas circuit and the oil circuit can be realized, providing users with greater flexibility in fuel selection. This flexibility enables the engine to operate stably under different fuel supply conditions without major modifications to the engine, thereby improving the reliability and adaptability of the engine.

[0049] 2. By providing the first hydraulic circulation component and the second hydraulic circulation component, precise control of the fuel injection system can be achieved with a smaller volume and mass, and can adapt to different working speeds and load requirements.

[0050] 3. Low-carbon fuels such as natural gas and ammonia can be used as alternative fuels in the gas line, which helps to significantly reduce the emission of CO2 and other greenhouse gases. In addition, the low sulfur content of fuels such as natural gas also helps to reduce the emission of sulfides. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0052] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0053] Figure 2 It is a schematic structural diagram of a first oil inlet check valve of the present invention;

[0054] Figure 3 It is a schematic structural diagram of a first electromagnetic balancing valve of the present invention;

[0055] Figure 4 It is a left side view of the driving mechanism of the present invention.

[0056] In the figure: 1. injector body; 2. air inlet orifice plate; 3. air circuit plug; 4. first hydraulic circulation assembly; 41. first pressure supply cylinder; 42. first pressurization chamber; 43. first liquid storage chamber; 44. first oil inlet check valve; 441. oil outlet; 442. oil inlet; 443. rubber plug; 444. closing spring; 445. support seat; 45. first electromagnetic balance valve; 451. moving iron plug; 452. balance valve channel; 453. fixed iron core; 454. coil; 455. iron core spring; 456. valve seat; 46. first oil return check valve; 47. first stabilizing spring; 48. first piezoelectric ceramic plate; 5. second hydraulic Circulation assembly; 51. second pressure supply cylinder; 52. second pressurization cabin; 53. second liquid storage chamber; 54. second oil inlet check valve; 55. second electromagnetic balance valve; 56. second oil return check valve; 57. second stabilizing spring; 58. second piezoelectric ceramic plate; 6. driving mechanism; 61. electric motor; 62. crankshaft; 63. motor base; 64. second piston; 65. first piston; 66. first connecting rod; 67. second connecting rod; 7. oil inlet channel; 8. needle valve channel; 81. upper chamber; 82. lower oil channel; 83. pressure chamber; 9. inflation chamber; 10. gas spray hole; 11. needle valve plug; 12. fuel spray hole. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] Reference Figure 1-Figure 4 The present invention provides a dual-fuel injector, comprising:

[0060] The fuel injector body 1 is provided with an air circuit and an oil circuit, wherein the air circuit is used to transport gas fuel and the oil circuit is used to transport fuel oil;

[0061] The hydraulic mechanism comprises a first hydraulic circulation component 4 and a second hydraulic circulation component 5, wherein the first hydraulic circulation component 4 is connected to the gas circuit, and the second hydraulic circulation component 5 is connected to the oil circuit;

[0062] A driving mechanism 6 connected to the first hydraulic circulation component 4 and the second hydraulic circulation component 5 so that the hydraulic oil in the first hydraulic circulation component 4 and the second hydraulic circulation component 5 can circulate;

[0063] When the first hydraulic circulation component 4 is in a closed circuit state, the hydraulic oil in the first hydraulic circulation component 4 can drive the gas circuit to be in a passage state. When the first hydraulic circulation component 4 is in a passage state, the hydraulic oil in the first hydraulic circulation component 4 circulates to make the gas circuit in a closed circuit state.

[0064] When the second hydraulic circulation component 5 is in a closed circuit state, the hydraulic oil in the second hydraulic circulation component 5 can drive the oil circuit to be in a passage state. When the second hydraulic circulation component 5 is in a passage state, the hydraulic oil in the second hydraulic circulation component 5 circulates to make the oil circuit in a closed circuit state.

[0065] By setting up independent gas circuits and oil circuits, and by controlling the passage and closed circuit states of the first hydraulic circulation component 4 and the second hydraulic circulation component 5, it is possible to control the passage and closed circuit states of the gas circuit and the oil circuit, so that the simultaneous injection and separate injection of two different types of fuels by the gas circuit and the oil circuit can be realized, providing users with greater flexibility in fuel selection. This flexibility enables the engine to operate stably under different fuel supply conditions without major modifications to the engine, thereby improving the reliability and adaptability of the engine.

[0066] In one embodiment of the present invention, the gas circuit comprises:

[0067] A first on-off assembly, connected to the first hydraulic circulation assembly 4;

[0068] A gas channel, connected to the first on-off component;

[0069] The gas filling cavity 9 is connected to an end of the gas passage away from the first on-off assembly;

[0070] A plurality of gas injection holes 10 are communicated with the gas filling cavity 9 .

[0071] The gas fuel can pass through the gas passage to the gas filling chamber 9 and be discharged through a plurality of gas spray holes 10 . The plurality of gas spray holes 10 are circumferentially arranged with the axis of the injector body 1 as the center.

[0072] In one embodiment of the present invention, the first on-off component comprises:

[0073] A first pressurized cabin 42, which is in communication with the gas passage and the first hydraulic circulation assembly 4;

[0074] The air inlet plate 2 is arranged above the first pressurized cabin 42;

[0075] The gas circuit plug 3 is slidably disposed in the first pressurized chamber 42. A connecting passage is provided on the gas circuit plug 3. When the gas circuit plug 3 slides, the connecting passage can switch the air inlet plate 2 and the gas channel between the on-off state.

[0076] One end of the first stabilizing spring 47 is fixedly connected to the end surface of the first pressurizing chamber 42 away from the air inlet plate 2 , and the other end is fixedly connected to the gas path plug 3 through the first piezoelectric ceramic sheet 48 .

[0077] The connecting channel has an L-shaped structure. When one end of the connecting channel on the gas circuit plug 3 corresponds to the gas channel, the dual-fuel gas can enter the gas channel through the connecting channel from the air inlet plate 2. The first stabilizing spring 47 is used for automatic resetting of the gas circuit plug 3. The first piezoelectric ceramic plate 48 is used to obtain the pressure signal and output it to the electronic control unit. The electronic control unit is a prior art and will not be described in detail here.

[0078] In one embodiment of the present invention, the first hydraulic circulation component 4 includes:

[0079] The first pressure supply cylinder 41 is connected to the driving mechanism 6;

[0080] A first oil inlet check valve 44, one end of which is connected to the first pressure supply cylinder 41, and the other end of which is connected to the first pressurizing chamber 42;

[0081] A first electromagnetic balance valve 45, one end of which is connected to the first pressurized chamber 42;

[0082] The first liquid storage chamber 43 is connected to an end of the first electromagnetic balance valve 45 away from the first pressurization chamber 42;

[0083] One end of the first oil return check valve 46 is connected to the first liquid storage chamber 43 , and the other end is connected to the first pressure supply cylinder 41 .

[0084] The first oil inlet check valve 44 is used to prevent the hydraulic oil from flowing back to the first pressure supply cylinder 41, the first oil return check valve 46 is used to prevent the hydraulic oil from flowing back to the first liquid storage chamber 43, and the first electromagnetic balance valve 45 is used to control the on-off state between the first booster chamber 42 and the first liquid storage chamber 43.

[0085] In one embodiment of the present invention, the oil circuit comprises:

[0086] A second on-off assembly, connected to the second hydraulic circulation assembly 5;

[0087] A plurality of fuel injection holes 12 are connected to the second on-off assembly.

[0088] A plurality of fuel injection holes 12 are arranged circumferentially around the axis of the injector body 1 .

[0089] In one embodiment of the present invention, the second on-off component comprises:

[0090] The needle valve channel 8 comprises an upper chamber 81, a lower oil channel 82 and a pressure chamber 83 which are connected in sequence, and the pressure chamber 83 is connected to the plurality of fuel injection holes 12;

[0091] The oil inlet channel 7 is connected with the upper chamber 81;

[0092] The second pressurized cabin 52 is in communication with the upper chamber 81;

[0093] The needle valve plug 11 is slidably disposed in the needle valve channel 8, and when the needle valve plug 11 slides, the oil inlet channel 7 and the pressure chamber 83 can be switched between an on-off state;

[0094] One end of the second stabilizing spring 57 is connected to the needle valve plug 11 , and the other end is connected to an end of the second pressurizing chamber 52 away from the upper chamber 81 through the second piezoelectric ceramic plate 58 .

[0095] When the needle valve plug 11 slides, its blocking part is misaligned with the oil inlet channel 7, so that the oil inlet channel 7 can be connected with the pressure chamber 83, so that the fuel enters the pressure chamber 83 and is sprayed out from the multiple fuel spray holes 12. The second stabilizing spring 57 is used for automatic resetting of the needle valve plug 11, and the second piezoelectric ceramic plate 58 is used to obtain the pressure signal and output it to the electronic control unit.

[0096] In one embodiment of the present invention, the second hydraulic circulation component comprises:

[0097] The second pressure supply cylinder 51 is connected to the driving mechanism;

[0098] A second oil inlet check valve 54, one end of which is connected to the second pressure supply cylinder 51, and the other end of which is connected to the upper chamber 81;

[0099] The second electromagnetic balance valve 55 has one end connected to the upper chamber 81;

[0100] The second liquid storage chamber 53 is connected to an end of the second electromagnetic balance valve 55 away from the upper chamber 81;

[0101] One end of the second oil return check valve 56 is connected to the second liquid storage chamber 53 , and the other end is connected to the second pressure supply cylinder 51 .

[0102] The second oil inlet check valve 54 is used to prevent the hydraulic oil from flowing back to the second pressure supply cylinder 51, the second oil return check valve 56 is used to prevent the hydraulic oil from flowing back to the second liquid storage chamber 53, and the second electromagnetic balance valve 55 is used to control the on-off state between the second booster chamber 52 and the second liquid storage chamber 53.

[0103] In one embodiment of the present invention, the angle between the axis of the gas injection hole 10 and the axis of the injector body 1 is 65°.

[0104] In one embodiment of the present invention, the angle between the axis of the fuel injection hole 12 and the axis of the injector body 1 is 70°.

[0105] Furthermore, the first oil inlet check valve 44, the first oil return check valve 46, the second oil inlet check valve 54 and the second oil return check valve 56 have the same structure. Specifically, the first oil inlet check valve 44 has an oil inlet 442 at one end and an oil outlet 441 at the other end. The support seat 445 is connected to the outer shell of the first oil inlet check valve 44 and retains the channel of the oil outlet 441. The inner side of the support seat 445 is connected to a closing spring 444, and the other end of the closing spring 444 is connected to a rubber plug 443, whose initial position just blocks the oil inlet 442. The first oil inlet check valve 44 is hydraulically controlled to open and close. When the pressure at the oil inlet 442 is greater than the pressure at the oil outlet 441, the rubber plug 443 overcomes the preload force of the closing spring 444 and moves toward the oil outlet 441, and the channel opens; when the pressure at the oil inlet 442 is less than or equal to the pressure at the oil outlet 441, the closing spring 444 returns to its original position and the rubber plug 443 blocks the oil inlet 442.

[0106] Furthermore, the first electromagnetic balancing valve 55 and the second electromagnetic balancing valve 55 have the same structure. Specifically, the first electromagnetic balancing valve 45 includes a moving iron plug 451, a balancing valve channel 452, a fixed iron core 453, a coil 454, an iron core spring 455, and a valve seat 456. When the power is on, the coil 454 generates an electromagnetic force to pull the moving iron plug 451 to overcome the preload force of the iron core spring 455 and lift it upward from the valve seat 456, and the valve is opened; when the power is off, the electromagnetic force disappears, and the iron core spring 455 presses the moving iron plug 451 onto the valve seat 456, and the valve is closed.

[0107] Furthermore, the driving mechanism 6 includes an electric motor 61, a crankshaft 62; a motor base 63, a second piston 64, a first piston 65, a first connecting rod 66, and a second connecting rod 67. The electric motor 61 drives the crankshaft 62 to rotate, and the crankshaft 62 drives the first piston 65 and the second piston 64 to supply pressure to the first pressure supply cylinder 41 and the second pressure supply cylinder 51.

[0108] A control method for a dual-fuel injector, comprising:

[0109] Dual fuel injection mode: the first hydraulic circulation assembly 4 and the second hydraulic circulation assembly 5 are controlled to be in a closed circuit state, and the driving mechanism 6 drives the hydraulic oil to flow along the first hydraulic circulation assembly 4 and the second hydraulic circulation assembly 5, so that the gas circuit and the oil circuit are both in a passage state, and the gas fuel and the fuel oil are delivered. Specifically, the first electromagnetic balance valve 45 and the second electromagnetic balance valve 55 are controlled to be closed, and the motor 61 drives the crankshaft 62 to rotate, thereby driving the first piston 65 and the second piston 64 to move up and down. When the first piston 65 moves downward, the liquid pressure in the first pressure supply cylinder 41 increases, so that the first oil inlet check valve 44 opens, the first oil return check valve 46 closes, and the first pressure supply cylinder 41 pumps liquid into the first booster cabin 42, and the hydraulic pressure in the first booster cabin 42 increases; when the first piston 65 moves upward, the liquid pressure in the first pressure supply cylinder 41 decreases, so that the first oil return check valve 46 opens, the first oil inlet check valve 44 closes, and the first liquid storage chamber 43 pumps liquid into the first pressure supply cylinder 41, and the liquid pressure in the first pressure supply cylinder 41 is balanced. As the hydraulic pressure in the first pressurized chamber 42 overcomes the preload force of the first stabilizing spring 47, the gas circuit plug 3 is lifted up, so that the L-shaped connecting channel in the gas circuit plug 3 is connected with the left gas circuit and the upper air inlet orifice plate 2 respectively, so that the entire gas circuit is connected, and the gas fuel enters from the air inlet orifice plate 2 and is ejected from the gas spray hole 10. When the gas circuit plug 3 reaches the top, the upper end is blocked by the air inlet orifice plate 2 and cannot move further upward. At this time, the pressure on the first piezoelectric ceramic sheet 48 squeezed by the gas circuit plug 3 and the first stabilizing spring 47 reaches the maximum value, and a stop signal is returned. When the second piston 64 moves downward, the liquid pressure in the second pressure supply cylinder 51 increases, so that the second oil inlet check valve 54 opens, the second oil return check valve 56 closes, the second pressure supply cylinder 51 pumps liquid into the upper chamber 81, and the hydraulic pressure in the upper chamber 81 increases; when the second piston 64 moves upward, the liquid pressure in the second pressure supply cylinder 51 decreases, so that the second oil return check valve 56 opens, the second oil inlet check valve 54 closes, the second liquid storage chamber 53 pumps liquid into the second pressure supply cylinder 51, and the liquid pressure in the second pressure supply cylinder 51 is balanced. As the hydraulic pressure in the upper chamber 81 overcomes the preload of the second stabilizing spring 57 and lifts the needle valve plug 11, the oil inlet channel 7 is connected to the lower oil channel 82, so the entire oil circuit is connected, diesel is pumped in from the oil inlet channel 7, and sprayed out from the fuel spray hole 12. When the needle valve plug 11 reaches the top, the second stabilizing spring 57 connected to the upper end presses against the second piezoelectric ceramic plate 58 at the top of the second booster chamber 52. At this time, the pressure on the second piezoelectric ceramic plate 58 reaches the maximum value and returns a stop signal. When the electronic control unit receives the stop signal from the first piezoelectric ceramic plate 48 and the second piezoelectric ceramic plate 58, the motor 61 stops working. When the injector body 1 is closed, the first electromagnetic balance valve 45 and the second electromagnetic balance valve 55 are opened, and the hydraulic pressure of the first booster chamber 42 and the upper chamber 81 causes the liquid to flow back to the first liquid storage chamber 43 and the second liquid storage chamber 53. At this time, the gas circuit plug 3 drops back to its original position, the gas circuit is closed, the needle valve plug 11 drops back to its original position, the oil circuit is closed, and the injection of fuel stops.

[0110] Single fuel injection mode: control one of the first hydraulic circulation component 4 and the second hydraulic circulation component 5 to be in a closed-circuit state and the other to be in a passage state, and drive the hydraulic oil along the first hydraulic circulation component 4 and the second hydraulic circulation component 5 by the driving mechanism 6, so that one of the gas circuit and the oil circuit is in a closed-circuit state and the other is in a passage state, to transport gas fuel or fuel oil. Specifically, when only fuel injection is required, the electronic control unit controls the first electromagnetic balance valve 45 to open and the second electromagnetic balance valve 55 to close, and the motor 61 drives the first piston 65 and the second piston 64 to move up and down. When the first piston 65 moves downward, the liquid pressure in the first pressure supply cylinder 41 increases, so that the first oil inlet check valve 44 opens, the first oil return check valve 46 closes, and the first pressure supply cylinder 41 pumps liquid into the first pressurization chamber 42 and the first liquid storage chamber 43; when the first piston 65 moves upward, the liquid pressure in the first pressure supply cylinder 41 decreases, so that the first oil return check valve 46 opens, the first oil inlet check valve 44 closes, the first pressurization chamber 42 and the first liquid storage chamber 43 pump liquid into the first pressure supply cylinder 41, and the hydraulic pressure in the first pressurization chamber 42 and the first liquid storage chamber 43 decreases. Therefore, the hydraulic pressure in the first pressurization chamber 42 remains unchanged, the air circuit plug 3 remains stationary, and the air circuit remains closed. When the second piston 64 moves downward, the liquid pressure in the second pressure supply cylinder 51 increases, so that the second oil inlet check valve 54 opens, the second oil return check valve 56 closes, the second pressure supply cylinder 51 pumps liquid into the upper chamber 81, and the hydraulic pressure in the upper chamber 81 increases; when the second piston 64 moves upward, the liquid pressure in the second pressure supply cylinder 51 decreases, so that the second oil return check valve 56 opens, the second oil inlet check valve 54 closes, the second liquid storage chamber 53 pumps liquid into the second pressure supply cylinder 51, and the liquid pressure in the second pressure supply cylinder 51 is balanced. As the hydraulic pressure in the upper chamber 81 overcomes the preload of the second stabilizing spring 57 and lifts the needle valve plug 11, the oil inlet channel 7 is connected to the lower oil channel 82, and the lower oil channel 82 is connected to the pressure chamber 83, so the entire oil circuit is connected, and diesel is sprayed from the fuel injection hole 12. When the needle valve plug 11 reaches the top, the second stabilizing spring 57 connected to the upper end pressurizes the second piezoelectric ceramic plate 58 at the top of the second booster chamber 52. At this time, the second piezoelectric ceramic plate 58 is subjected to the maximum pressure and returns a stop signal. When the electronic control unit receives the stop signal from the second piezoelectric ceramic plate 58, the motor 61 stops working. When the injector is closed, the second electromagnetic balance valve 55 is opened, and the hydraulic pressure of the upper chamber 81 causes the liquid to flow back to the second liquid storage chamber 53. At this time, the needle valve plug 11 drops back to its original position, the oil circuit is closed, and the injection stops. When only gas fuel needs to be injected, the electronic control unit controls the first electromagnetic balance valve 45 to close and the second electromagnetic balance valve 55 to open, and the motor 61 drives the first piston 65 and the second piston 64 to move up and down.When the first piston 65 moves downward, the liquid pressure in the first pressure supply cylinder 41 increases, so that the first oil inlet check valve 44 opens, the first oil return check valve 46 closes, and the first pressure supply cylinder 41 pumps liquid into the first booster chamber 42; when the first piston 65 moves upward, the liquid pressure in the first pressure supply cylinder 41 decreases, so that the first oil return check valve 46 opens, the first oil inlet check valve 44 closes, and the first liquid storage chamber 43 pumps liquid into the first pressure supply cylinder 41, and the hydraulic pressure in the first booster chamber 42 and the first liquid storage chamber 43 decreases, so the hydraulic pressure in the first booster chamber 42 increases, pushing the gas circuit plug 3 to move upward, and the gas circuit is opened. When the gas circuit plug 3 reaches the top, its upper end is blocked by the air inlet orifice plate 2, and at this time, the first piezoelectric ceramic plate 48 connected to the lower end is subjected to the maximum pressure and returns a stop signal. When the second piston 64 moves downward, the liquid pressure in the second pressure supply cylinder 51 increases, so that the second oil inlet check valve 54 opens, the second oil return check valve 56 closes, and the second pressure supply cylinder 51 pumps liquid into the upper chamber 81 and the second liquid storage chamber 53; when the second piston 64 moves upward, the liquid pressure in the second pressure supply cylinder 51 decreases, so that the second oil return check valve 56 opens, the second oil inlet check valve 54 closes, and the second liquid storage chamber 53 and the upper chamber 81 pump liquid into the second pressure supply cylinder 51, so the liquid pressure in the upper chamber 81 remains unchanged, the hydraulic pressure in the upper chamber 81 cannot lift the needle valve plug 11, and the oil circuit remains closed. When the electronic control unit receives the stop signal from the first piezoelectric ceramic plate 48 in the single fuel mode, the motor 61 stops working. When the injector is closed, the first electromagnetic balance valve 45 is opened, and the hydraulic pressure of the first booster chamber 42 causes the liquid to flow back to the first liquid storage chamber 43. At this time, the gas circuit plug 3 drops back to its original position, the gas circuit is closed, and the injection stops.

[0111] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0112] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A dual fuel injector, characterized in that: include: The fuel injector body (1) is provided with an air circuit and an oil circuit, wherein the air circuit is used to transport gas fuel and the oil circuit is used to transport fuel oil; A hydraulic mechanism, comprising a first hydraulic circulation component (4) and a second hydraulic circulation component (5), wherein the first hydraulic circulation component (4) is connected to the gas circuit, and the second hydraulic circulation component (5) is connected to the oil circuit; A driving mechanism (6) connected to the first hydraulic circulation component (4) and the second hydraulic circulation component (5) so as to enable the hydraulic oil in the first hydraulic circulation component (4) and the second hydraulic circulation component (5) to circulate; When the first hydraulic circulation component (4) is in a closed circuit state, the hydraulic oil in the first hydraulic circulation component (4) can drive the gas circuit to be in a passage state; when the first hydraulic circulation component (4) is in a passage state, the hydraulic oil in the first hydraulic circulation component (4) circulates to make the gas circuit in a closed circuit state; When the second hydraulic circulation component (5) is in a closed circuit state, the hydraulic oil in the second hydraulic circulation component (5) can drive the oil circuit to be in a passage state. When the second hydraulic circulation component (5) is in a passage state, the hydraulic oil in the second hydraulic circulation component (5) circulates to make the oil circuit in a closed circuit state.

2. A dual fuel injector according to claim 1, characterized in that: The gas circuit comprises: a first on-off assembly, connected to the first hydraulic circulation assembly (4); A gas channel, connected to the first on-off component; An air filling cavity (9) connected to an end of the gas passage away from the first on-off assembly; A plurality of gas spray holes (10) are connected to the gas filling chamber (9).

3. A dual fuel injector according to claim 2, characterized in that: The first on-off component comprises: A first pressurized cabin (42) in communication with the gas channel and the first hydraulic circulation assembly (4); An air inlet plate (2) disposed above the first pressurized cabin (42); A gas circuit plug (3) is slidably disposed in the first pressurized chamber (42), and a connecting channel is provided on the gas circuit plug (3). When the gas circuit plug (3) slides, the connecting channel can switch the air inlet plate (2) and the gas channel between an on-off state and an off-off state; A first stabilizing spring (47) has one end fixedly connected to the end surface of the first pressurized chamber (42) away from the air inlet plate (2), and the other end fixedly connected to the air path plug (3) via a first piezoelectric ceramic sheet (48).

4. A dual fuel injector according to claim 3, characterized in that: The first hydraulic circulation component (4) comprises: A first pressure supply cylinder (41) connected to the driving mechanism (6); A first oil inlet check valve (44), one end of which is connected to the first pressure supply cylinder (41), and the other end of which is connected to the first pressurizing chamber (42); A first electromagnetic balancing valve (45), one end of which is connected to the first pressurized chamber (42); A first liquid storage chamber (43) connected to an end of the first electromagnetic balance valve (45) away from the first pressurized chamber (42); A first oil return check valve (46) has one end connected to the first liquid storage chamber (43) and the other end connected to the first pressure supply cylinder (41).

5. A dual fuel injector according to claim 1, characterized in that: The oil circuit comprises: a second on-off assembly, connected to the second hydraulic circulation assembly (5); A plurality of fuel injection holes (12) are connected to the second on-off assembly.

6. A dual fuel injector according to claim 5, characterized in that: The second on-off component comprises: The needle valve channel (8) comprises an upper chamber (81), a lower oil channel (82) and a pressure chamber (83) which are connected in sequence, and the pressure chamber (83) is connected to the plurality of fuel injection holes (12); An oil inlet channel (7) communicates with the upper chamber (81); a second pressurized cabin (52) in communication with the upper chamber (81); A needle valve plug (11) is slidably disposed in the needle valve channel (8), and when the needle valve plug (11) slides, the oil inlet channel (7) and the pressure chamber (83) can be switched between an on-off state; A second stabilizing spring (57) has one end connected to the needle valve plug (11), and the other end connected to an end of the second pressurizing chamber (52) away from the upper chamber (81) through a second piezoelectric ceramic sheet (58).

7. A dual fuel injector according to claim 6, characterized in that: The second hydraulic circulation component comprises: A second pressure supply cylinder (51) connected to the driving mechanism; A second oil inlet check valve (54), one end of which is connected to the second pressure supply cylinder (51), and the other end of which is connected to the upper chamber (81); A second electromagnetic balancing valve (55), one end of which is connected to the upper chamber (81); A second liquid storage chamber (53) connected to an end of the second electromagnetic balance valve (55) away from the upper chamber (81); A second oil return check valve (56) has one end connected to the second liquid storage chamber (53) and the other end connected to the second pressure supply cylinder (51).

8. A dual fuel injector according to claim 2, characterized in that: The angle between the axis of the gas spray hole (10) and the axis of the fuel injector body (1) is 65°.

9. A dual fuel injector according to claim 5, characterized in that: The angle between the axis of the fuel injection hole (12) and the axis of the fuel injector body (1) is 70°.

10. A control method for a dual-fuel injector, based on a dual-fuel injector according to any one of claims 1 to 9, characterized in that: include: Dual fuel injection mode: the first hydraulic circulation component (4) and the second hydraulic circulation component (5) are controlled to be in a closed circuit state, and the driving mechanism (6) drives the hydraulic oil to flow along the first hydraulic circulation component (4) and the second hydraulic circulation component (5), so that the gas circuit and the oil circuit are both in a passage state, and gas fuel and fuel oil are transported; Single fuel injection mode: Control one of the first hydraulic circulation component (4) and the second hydraulic circulation component (5) to be in a closed circuit state and the other to be in a passage state, and drive the hydraulic oil to flow along the first hydraulic circulation component (4) and the second hydraulic circulation component (5) by the driving mechanism (6), so that one of the gas circuit and the oil circuit is in a closed circuit state and the other is in a passage state, thereby delivering gas fuel or fuel oil.

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