Fuel injection pump, fuel injector, fuel injection system and internal combustion engine

Abstract

A fuel injection pump, an injector, a fuel injection system and an internal combustion engine. The fuel injection pump includes: a pump body and a plunger; the pump body includes: a first switching component for opening or closing a first lubrication passage and a first fuel passage in the fuel injection pump; wherein, a first sealing component is arranged on the first switching component, and the first sealing component is used for isolating the lubricating oil flowing through the first lubrication passage from the fuel flowing through the first fuel passage. By applying the above solution, fuel leakage in the fuel injection pump can be avoided from affecting the normal operation of the fuel injection pump.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to a fuel injection pump, an injector, a fuel injection system, and an internal combustion engine. Background Art

[0002] An internal combustion engine is a power machine, which is a thermal engine that directly converts the heat energy released by the combustion of fuel inside the machine into power. Internal combustion engines are widely used in all walks of life in the national economy, such as automobiles, agricultural machinery, construction machinery, ships, trains, aviation, ships, and war vehicles.

[0003] An internal combustion engine is equipped with a fuel injection system for delivering fuel into the cylinder. The mixture of fuel and air in the cylinder outputs kinetic energy after combustion.

[0004] The fuel injection pump and the injector are the main components of the fuel injection system of an internal combustion engine. Solenoid valves are usually provided in the fuel injection pump and the injector. By controlling the energization or de-energization of the solenoid valve in the fuel injection pump, the lubrication channel and the fuel channel in the fuel injection pump can be opened or closed to deliver fuel or return oil to the injector. By controlling the energization or de-energization of the solenoid valve in the injector, the lubrication channel and the fuel channel in the injector can be opened or closed to deliver fuel or return oil to the cylinder.

[0005] However, in the existing fuel injection pump or injector, the normal operation of the device is often affected due to solenoid valve failures. Summary of the Invention

[0006] The problem to be solved by the present invention is to avoid fuel leakage in the fuel injection pump from affecting the normal operation of the fuel injection pump.

[0007] Alternatively, the problem to be solved by the present invention is to avoid fuel leakage in the injector from affecting the normal operation of the injector.

[0008] To solve the above problems, an embodiment of the present invention provides a fuel injection pump, which includes: a pump body and a plunger; a plunger hole, a first lubrication channel, and a first fuel channel are provided in the pump body; the plunger is movably located in the plunger hole;

[0009] The pump body further includes: a first switching component for opening or closing the first lubrication channel and the first fuel channel in the fuel injection pump;

[0010] Wherein, a first sealing component is provided on the first switching component, and the first sealing component is used to isolate the lubricating oil flowing through the first lubrication channel from the fuel flowing through the first fuel channel.

[0011] Optionally, the first switching component is a first solenoid valve.

[0012] Optionally, the first solenoid valve includes: an electromagnetic coil, a valve sleeve connected to the electromagnetic coil, and a valve core movably located in the inner cavity of the valve sleeve.

[0013] Optionally, the first sealing member is clamped on the valve core of the first solenoid valve.

[0014] Optionally, the first lubrication channel includes: an oil outlet channel and an oil inlet channel; the first fuel channel includes: a feed and return channel and a discharge channel; on the valve core, at a position corresponding to between the first lubrication channel and the discharge channel, a groove is provided, and the first sealing member is clamped in the groove and is in interference fit with the groove.

[0015] Optionally, when the valve of the first solenoid valve is closed, the first sealing member is located between the first lubrication channel and the discharge channel with the smallest first distance; the first distance is the distance between any first lubrication channel and the discharge channel in the moving direction of the valve core of the first solenoid valve.

[0016] Optionally, the first sealing member is a sealing ring.

[0017] An embodiment of the present invention further provides an injector, which includes: an injector body and a needle valve; a needle valve hole, a second lubrication channel and a second fuel channel are provided in the injector body; the needle valve is movably located in the needle valve hole; the needle valve is used to open or close the second lubrication channel and the second fuel channel in the injector;

[0018] Wherein, a second sealing member is provided on the needle valve, and the second sealing member is used to isolate the lubricating oil flowing through the second lubrication channel from the fuel flowing through the second fuel channel.

[0019] Optionally, the needle valve is a second solenoid valve.

[0020] Optionally, the second solenoid valve includes: an electromagnetic coil and a valve core movably located in the inner cavity of the needle valve hole.

[0021] Optionally, the second sealing member is clamped on the valve core of the needle valve.

[0022] Optionally, the second lubrication channel includes: an oil outlet channel and an oil inlet channel; the second fuel channel includes: a feed channel;

[0023] On the valve core, at a position corresponding to between the second lubrication channel and the feed channel, a groove is provided, and the second sealing member is clamped in the groove and is in interference fit with the groove.

[0024] Optionally, the second sealing member is located between the second lubricating passage and the feed passage with the smallest second distance; the second distance is the distance between any second lubricating passage and any second fuel passage in the moving direction of the needle valve.

[0025] Optionally, the second sealing member is a sealing ring.

[0026] An embodiment of the present invention further provides a fuel injection system, which includes any one of the above-mentioned fuel injection pumps and any one of the above-mentioned fuel injectors.

[0027] An embodiment of the present invention further provides an internal combustion engine, including the above-mentioned fuel injection system.

[0028] Compared with the prior art, the technical solution of the embodiment of the present invention has the following advantages:

[0029] Applying the solution of the present invention, by providing the first sealing member on the first switching member, the lubricating oil flowing through the first lubricating passage can be isolated from the fuel flowing through the first fuel passage, avoiding the fuel flowing through the first fuel passage from leaking into the first switching member and affecting the normal operation of the first switching member, and further affecting the normal operation of the fuel injection pump. At the same time, it can also avoid the decrease in the purity of the lubricating oil due to the leakage of the fuel flowing through the first fuel passage, affecting the lubrication effect.

[0030] Applying the solution of the present invention, by providing the second sealing member on the second switching member, the lubricating oil flowing through the second lubricating passage can be isolated from the fuel flowing through the second fuel passage, avoiding the fuel flowing through the second fuel passage from leaking into the second switching member and affecting the normal operation of the second switching member, and further affecting the normal operation of the fuel injector. At the same time, it can also avoid the decrease in the purity of the lubricating oil due to the leakage of the fuel flowing through the second fuel passage, affecting the lubrication effect. Description of the Drawings

[0031] Figure 1 is a simplified schematic diagram of an internal combustion engine in an embodiment of the present invention, and the dotted arrow in the figure indicates the fuel delivery direction;

[0032] Figure 2 is a layout schematic diagram of a fuel injector and a glow plug on a cylinder head in an embodiment of the present invention;

[0033] Figure 3 is a partial simplified schematic diagram of a fuel injection pump in an embodiment of the present invention;

[0034] Figure 4 is a partial simplified schematic diagram of a fuel injector in an embodiment of the present invention. Detailed Description

[0035] Figure 1 is a simplified schematic diagram of an internal combustion engine. Referring to Figure 1 , this embodiment provides an internal combustion engine that can not only burn traditional diesel fuel, but also burn low-viscosity fuels such as alternative fuels like methanol, ethanol, dimethyl ether, and gasoline. These alternative fuels have high energy efficiency, low pollution, low cost, energy diversification, and energy security. Therefore, this internal combustion engine has good application prospects. It should be noted that in the technical solution of the present invention, the so-called low-viscosity fuel refers to a fuel with a viscosity less than that of diesel. Combining Figures 1 to 2 as shown, this internal combustion engine includes a body 1 and a fuel injection system P. Among them:

[0036] The body 1 includes a cylinder block 10 and a cylinder head 11 covering the cylinder block 10. A piston (not labeled) is movably located within the cylinder block 10. The cylinder block 10, the cylinder head 11, and the piston enclose a cylinder 12, and fuel burns within the cylinder 12 to generate power to drive the piston to move.

[0037] An electric glow plug 2 is also provided in the internal combustion engine. The electric glow plug 2 is installed on the cylinder head 11 and extends into the cylinder 12. The electric glow plug 2 can provide heat energy, enabling the atomized fuel injected into the cylinder 12 to quickly evaporate in the air flow and be fully and evenly mixed with the air in the cylinder 12 to form a mixture, and the mixture burns under the combustion assistance of the electric glow plug 2.

[0038] The electric glow plug 2 is close to the exhaust passage (not shown) on the cylinder head 11, and the electric glow plug 2 and the fuel injector 7 are symmetrical about the central connection line of the intake valve and the exhaust valve (not shown) on the cylinder head 11, so that the openings (not labeled) on the cylinder head 11 for arranging the electric glow plug 2 and the openings (not labeled) for arranging the fuel injector 7 are also symmetrically arranged, making the structure of the cylinder head 11 roughly symmetrical and the mechanical properties relatively balanced.

[0039] The fuel injection system P is used to deliver fuel into the cylinder 12 and includes a fuel injection pump 6 and a fuel injector 7 connected through a pipeline 9. In the fuel delivery direction (as shown by the dotted arrow in the figure), the fuel injection pump 6 is located upstream of the fuel injector 7. The fuel injector 7 is installed on the cylinder head 11 and extends into the cylinder 12. After the fuel is delivered from the fuel injection pump 6 to the fuel injector 7, the fuel injector 7 sprays atomized fuel into the cylinder 12, and the mixture of fuel and air in the cylinder 12 outputs kinetic energy after combustion.

[0040] It has been discovered by the inventor that the fuel in the fuel injection pump 6 often leaks into the solenoid valve, thereby affecting the normal operation of the solenoid valve and ultimately affecting the operation of the fuel injection pump 6.

[0041] Similarly, the fuel in the fuel injector 7 also leaks into the solenoid valve, thereby affecting the normal operation of the solenoid valve and ultimately affecting the operation of the fuel injector 7.

[0042] In view of this problem, the present invention provides a fuel injection pump. By providing a sealing member on the first switching member of the fuel injection pump, the lubricating oil flowing through the first lubricating passage can be isolated from the fuel flowing through the first fuel passage, thereby preventing the fuel flowing through the first fuel passage from leaking into the interior of the first switching member, avoiding affecting the normal operation of the fuel injection pump, and preventing the purity of the lubricating oil from decreasing.

[0043] The present invention also provides an injector. By providing a second sealing member on the second switching member, the lubricating oil flowing through the second lubricating passage can be isolated from the fuel flowing through the second fuel passage, thereby preventing the fuel flowing through the second fuel passage from leaking into the interior of the second switching member, avoiding affecting the normal operation of the injector, and preventing the purity of the lubricating oil from decreasing.

[0044] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of specific embodiments of the present invention will be given with reference to the accompanying drawings.

[0045] Figure 3 It is a partially simplified structural schematic diagram of a fuel injection pump 6. Referring to Figure 3 , the fuel injection pump 6 includes a pump body 60 and a plunger 61. The pump body 60 is provided with a plunger hole 600, a first lubricating passage, and a first fuel passage. Among them, the plunger 61 is axially movable within the plunger hole 600. The first lubricating passage may include an oil inlet passage 63 and an oil outlet passage 64. The first fuel passage may include a fuel inlet and return passage 65 and a fuel outlet passage 66. The fuel inlet and return passage 65 can serve as both a fuel inlet passage and a fuel return passage.

[0046] The pump body 60 further includes a first switching member for opening or closing the first lubricating passage and the first fuel passage within the fuel injection pump 6.

[0047] Among them, a first sealing member 674 is provided on the first switching member, and the first sealing member 674 is used to isolate the lubricating oil flowing through the first lubricating passage from the fuel flowing through the first fuel passage.

[0048] In an embodiment of the present invention, the first switch component 67 may be a first solenoid valve. The first solenoid valve 67 may include: an electromagnetic coil 671, a valve sleeve 672 connected to the electromagnetic coil, and a valve core 673 movably located in the inner cavity of the valve sleeve. A valve 675 is further provided at one end of the valve core 673 opposite to the electromagnetic coil 671. When the electromagnetic coil 671 is energized, the electromagnetic coil 671 generates an electromagnetic force, which causes the valve core 673 to move to the left. When the electromagnetic coil 671 is de-energized, the electromagnetic force generated by the electromagnetic coil 671 disappears, causing the valve core 673 to move to the right.

[0049] In a specific implementation, a plurality of holes are usually provided on the valve sleeve 672 to communicate with the first lubrication channel and the first fuel channel. For example, four holes, namely hole 1, hole 2, hole 3, and hole 4, can be provided on the valve sleeve 672. It can be set that hole 1 communicates with the oil inlet passage 63, hole 2 communicates with the oil outlet passage 64, and hole 3 and hole 4 communicate with the discharge passage 66 interrupted by the first solenoid valve.

[0050] When the plunger 61 moves towards the bottom of the plunger hole 600, the electromagnetic coil 671 is de-energized, the valve core 673 moves to the right, the valve 675 is opened, the inlet and return passage 65 is opened, the fuel injection pump 6 starts to suck oil, and the fuel enters the top of the plunger hole 600 through the inlet and return passage 65.

[0051] When the plunger 61 moves towards the top of the plunger hole 600, the fuel injection pump 6 starts to press oil, and a certain pressure is applied to the fuel at the top of the plunger hole 600. At this time, the electromagnetic coil 671 is energized, and the energized electromagnetic coil 671 generates an electromagnetic force, which attracts the valve core 673 to move to the left. Eventually, the valve 675 closes the inlet and return passage 65, stopping the fuel from entering the plunger hole 600. After the pressure applied to the fuel at the top of the plunger hole 600 reaches a certain value, the fuel enters the cavity between the first solenoid valve and the valve sleeve 672 from the discharge passage 66, and then enters the injector 7 from the discharge passage 66.

[0052] When the electromagnetic coil 671 is de-energized again, the valve core 673 moves to the right, the valve 675 is opened again, and the residual fuel in the cavity between the first solenoid valve and the valve sleeve 672 flows into the inlet and return passage 65, completing a fuel supply cycle.

[0053] In a specific implementation, the oil inlet passage 63 and the oil outlet passage 64 penetrate through the pump body 60 from outside the pump body 60 and lead to the first switch component. Thus, after the valve 675 closes the inlet and return passage 65, the oil inlet passage 63 and the oil outlet passage 64 are opened, and the lubricating oil can flow into the first switch component from one end outside the pump body 60 through the first lubrication channel to lubricate the first switch component and reduce wear.

[0054] To improve the lubrication and sealing effects, preferably, the lubricating oil in the oil inlet passage 63 has a relatively high pressure. In this embodiment, the lubricating oil comes from the lubrication system of the internal combustion engine itself. This lubrication system sucks the lubricating oil from the oil sump and then transports it to various components in the internal combustion engine that need lubrication, such as the piston in the cylinder block.

[0055] Since there is usually a certain gap between the valve core 673 and the valve sleeve 672, fuel will leak through this gap into the electromagnetic coil 671, which will then cause the electromagnetic coil 671 to fail to respond to the control instructions for energization or de-energization in a timely manner, affecting the normal operation of the first solenoid valve.

[0056] Therefore, in the embodiment of the present invention, in order to prevent fuel leakage, the valve core 673 can be provided with a first sealing member 674. This first sealing member 674 can isolate the lubricating oil flowing through the first lubrication passage from the fuel flowing through the first fuel passage, preventing the fuel from flowing into the electromagnetic coil 671 or into the area that needs to be lubricated by the lubricating oil.

[0057] In a specific implementation, the first sealing member 674 can be made of a material with a certain elasticity and can prevent the corrosion of fuel and lubricating oil. After the first sealing member 674 is provided, it only slows down the moving speed of the valve core 673, but does not prevent the valve core 673 from moving within the valve sleeve 672. The first sealing member 674 protrudes from the outer surface of the valve core 673 and closely adheres to the inner surface of the valve sleeve 672.

[0058] In a specific implementation, the structure of the first sealing member 674 can be various, and there is no specific limitation, as long as it can isolate the lubricating oil flowing through the first lubrication passage from the fuel flowing through the first fuel passage.

[0059] In an embodiment of the present invention, the first sealing member 674 can be a sealing ring, and the sealing ring is clamped on the outer surface of the valve core 673.

[0060] In a specific implementation, the sealing ring 674 can be clamped on the outer surface of the valve core 673 in various ways.

[0061] In an embodiment of the present invention, in order to enhance the fixing effect, a groove can be provided at a corresponding position on the outer surface of the valve core 673. The depth and width of this groove match those of the sealing ring 674. By setting the thickness of the sealing ring 674, the sealing ring 674 is in interference fit with the groove, so that the sealing ring 671 can isolate the lubricating oil flowing through the first lubrication passage from the fuel flowing through the first fuel passage.

[0062] In other embodiments of the present invention, the friction force can also be increased at corresponding positions on the outer surface of the valve core 673. By means of this friction force, the sealing ring 674 is fixed on the outer surface of the valve core 673.

[0063] In an embodiment of the present invention, when the valve of the first solenoid valve is closed, the first sealing member 674 is located between the first lubricating channel with the smallest first distance and the discharge channel. Wherein, the first distance is the distance between any first lubricating channel and the discharge channel in the moving direction of the valve core 673.

[0064] Refer to Figure 3 , in an embodiment of the present invention, the first lubricating channel and the oil outlet channel in the first fuel channel are both in a direction perpendicular to the moving direction of the valve core 673. The first distance can be the distance between the discharge channel 62 and the oil inlet channel 63, or the distance between the discharge channel 62 and the oil outlet channel 64.

[0065] If the first distance between the discharge channel 62 and the oil inlet channel 63 is less than the first distance between the discharge channel 62 and the oil outlet channel 64, when the valve of the first solenoid valve is closed, the first sealing member 674 is located on the outer surface of the valve core 673 between the discharge channel 62 and the oil inlet channel 63.

[0066] If the first distance between the discharge channel 62 and the oil inlet channel 63 is greater than the first distance between the discharge channel 62 and the oil outlet channel 64, when the valve of the first solenoid valve is closed, the first sealing member 674 is located on the outer surface of the valve core 673 between the discharge channel 62 and the oil outlet channel 64.

[0067] In a specific implementation, in order to enhance the sealing effect, one or more first sealing members 674 can be provided on the outer surface of the valve core 673. Each of the first sealing members 674 can be implemented with reference to the above embodiments.

[0068] It can be understood that when multiple first sealing members 674 are provided, all the first sealing members 674 are located between the first lubricating channel with the smallest first distance and the discharge channel when the valve of the first solenoid valve is closed.

[0069] Refer to Figure 4 , an embodiment of the present invention further provides an injector 7, which can include: an injector body 70 and a needle valve 71; a needle valve hole 700, a second lubricating channel and a second fuel channel are provided in the injector body 70; the needle valve 71 is axially movably located in the needle valve hole 700. By moving the needle valve 71 in the needle valve hole 700, the second lubricating channel and the second fuel channel in the injector 70 can be opened or closed. The second lubricating channel includes an oil outlet channel 73 and an oil inlet channel 72; the second fuel channel includes: a feed channel 74.

[0070] Wherein, a second sealing member 710 is provided on the needle valve 71, and the second sealing member 710 is used to isolate the lubricating oil flowing through the second lubricating passage from the fuel flowing through the second fuel passage.

[0071] In an embodiment of the present invention, the needle valve 71 may be a second solenoid valve. The second solenoid valve 71 may include: an electromagnetic coil 711 and a valve core 712. The valve core 712 can move in the inner cavity of the needle valve hole 700. A nozzle 700a is provided at one end of the needle valve hole 700 away from the electromagnetic coil 711.

[0072] When the electromagnetic coil 711 is energized, the electromagnetic coil 711 generates an electromagnetic force, which causes the valve core 712 to move to the left. When the electromagnetic coil 711 is de-energized, the electromagnetic force generated by the electromagnetic coil 711 disappears, causing the valve core 712 to move to the right.

[0073] In a specific implementation, a plurality of holes are usually provided on the needle valve hole 700 to communicate with the second lubricating passage and the second fuel passage. For example, four holes, namely hole k1, hole k2 and hole k3, can be provided on the needle valve hole 700. It can be set that hole k1 communicates with the oil inlet passage 72, hole k2 communicates with the oil outlet passage 73, and hole k3 communicates with the feed passage 74.

[0074] In a specific implementation, when the electromagnetic coil 711 is energized, the valve core 712 moves to the left, the injector 7 sucks oil, and the fuel injection pump 6 transports high-pressure fuel to the injector 7 through the feed passage 74 and stores it in the cavity between the needle valve 71 and the needle valve hole 700.

[0075] When the electromagnetic coil 711 is de-energized, the valve core 712 moves to the right, and the fuel stored in the injector 7 is sprayed towards the cylinder 12 through the nozzle 700a to complete a fuel supply cycle.

[0076] In a specific implementation, the oil inlet passage 72 and the oil outlet passage 73 penetrate through the injector body 70 from the outside of the injector body 70 and lead to the needle valve 71. Thus, after the needle valve 71 is opened, the oil inlet passage 72 and the oil outlet passage 73 will be opened, and the lubricating oil can flow into the needle valve 71 from one end of the oil inlet passage 72 penetrating through the outside of the pump body 60 to lubricate the needle valve 71 and reduce wear.

[0077] In order to improve the lubrication and sealing effects, preferably, the lubricating oil in the oil inlet passage 72 has a relatively high pressure. In this embodiment, the lubricating oil comes from the lubrication system of the internal combustion engine itself. The lubrication system sucks the lubricating oil from the oil sump and transports it to each component that needs to be lubricated in the internal combustion engine, such as the piston in the cylinder block.

[0078] Since there is usually a certain gap between the valve core 712 and the needle valve hole 700, fuel will leak through this gap into the electromagnetic coil 711, which will cause the electromagnetic coil 711 to fail to respond to the control instructions of energization or de-energization in a timely manner, affecting the normal operation of the needle valve 71.

[0079] Therefore, in the embodiments of the present invention, in order to avoid fuel leakage, the valve core 712 can be provided with a second sealing member 710. The second sealing member 710 can isolate the lubricating oil flowing through the second lubricating channel from the fuel flowing through the second fuel channel, preventing the fuel from flowing into the electromagnetic coil 711 or into the area that needs to be lubricated by the lubricating oil.

[0080] In a specific implementation, the second sealing member 710 can be made of a material with a certain elasticity and can prevent the corrosion of fuel and lubricating oil. After the second sealing member 710 is provided, it will only slow down the moving speed of the second sealing member 710, but will not prevent the second sealing member 710 from moving within the needle valve hole 700. The second sealing member 710 will protrude from the outer surface of the valve core 712 and be in close contact with the inner surface of the needle valve hole 700.

[0081] In a specific implementation, the structure of the second sealing member 710 can be various, and there is no specific limitation, as long as it can isolate the lubricating oil flowing through the second lubricating channel from the fuel flowing through the second fuel channel.

[0082] In an embodiment of the present invention, the second sealing member 710 can be a sealing ring, and the sealing ring is clamped on the outer surface of the needle valve hole 700.

[0083] In a specific implementation, the sealing ring 711 can be clamped on the outer surface of the needle valve hole 700 in various ways.

[0084] In an embodiment of the present invention, in order to enhance the fixing effect, a groove can be provided at a corresponding position on the outer surface of the valve core 712. The depth and width of the groove match the sealing ring 711. By setting the thickness of the sealing ring 711, the sealing ring 711 is in interference fit with the groove, so that the sealing ring 711 can isolate the lubricating oil flowing through the second lubricating channel from the fuel flowing through the second fuel channel.

[0085] In other embodiments of the present invention, the friction can also be increased at a corresponding position on the outer surface of the valve core 712, and by means of this friction, the sealing ring 711 is fixed on the outer surface of the valve core 712.

[0086] In an embodiment of the present invention, when the valve of the needle valve 71 is closed, the second sealing member 710 is located between the second lubricating passage and the feed passage where the second distance is the smallest. Herein, the second distance is the distance between any second lubricating passage and the feed passage in the moving direction of the valve core 712 of the needle valve 71.

[0087] Referring to Figure 4 , in an embodiment of the present invention, the second lubricating passage and the oil outlet passage in the second fuel passage are both perpendicular to the moving direction of the valve core 712 of the needle valve 71. The second distance can be the distance between the feed passage 74 and the oil outlet passage 73, or the distance between the feed passage 74 and the oil passage 72.

[0088] If the second distance between the feed passage 74 and the oil outlet passage 73 is less than the second distance between the feed passage 74 and the oil inlet passage 72, when the needle valve 71 is closed, the second sealing member 710 is located on the outer surface of the valve core 712 between the feed passage 74 and the oil outlet passage 73.

[0089] If the second distance between the feed passage 74 and the oil outlet passage 73 is greater than the second distance between the feed passage 74 and the oil inlet passage 72, when the needle valve 71 is closed, the second sealing member 710 is located on the outer surface of the valve core 712 between the feed passage 74 and the oil inlet passage 72.

[0090] In a specific implementation, to enhance the sealing effect, one or more second sealing members 710 can be provided on the outer surface of the valve core 712. Each of the second sealing members 710 can be implemented with reference to the above embodiments.

[0091] It can be understood that when multiple second sealing members 710 are provided, all the second sealing members 710 are located between the second lubricating passage and the feed passage where the second distance is the smallest when the needle valve 71 is closed.

[0092] In a specific implementation, referring to Figure 1 , the fuel injection system P may further include a fuel tank 3, a control valve 4, a fuel pump 5, and an electronic control device 8. The fuel is sequentially transported from the fuel tank 3, the control valve 4, and the fuel pump 5 to the fuel injection pump 6.

[0093] Among them, the fuel tank 3 has fuel chambers 3a and 3b that are isolated from each other, and different types of fuels are stored between the fuel chambers 3a and 3b. The control valve 4 has an oil outlet and two oil inlets (not labeled). The oil outlet is connected to the fuel transfer pump 5 through a pipeline 9. One of the oil inlets corresponds to the fuel chamber 3a and is connected through the pipeline 9, and the other oil inlet corresponds to the fuel chamber 3b and is connected through the pipeline 9. The fuel transfer pump 5 is connected to the fuel injection pump 6 through the pipeline 9. The working pressure of the fuel transfer pump 5 is less than the working pressure of the fuel injection pump 6. That is, relatively speaking, the fuel transfer pump 5 is a low-pressure pump, and the fuel injection pump 6 is a high-pressure pump. Under the combined action of the fuel transfer pump 5 and the fuel injection pump 6, the pressure of the fuel ejected by the fuel injector 7 can be increased, enabling the fuel to be better atomized, thereby reducing emissions and saving fuel.

[0094] The control valve 4 is configured to: when the electronic control unit 8 of the fuel injection system P receives a fuel type selection command, control the oil outlet of the control valve 4 to communicate with one of the oil inlets according to the command output by the electronic control unit 8, and the one oil inlet communicates with the fuel chamber containing the corresponding type of fuel.

[0095] Specifically, when the electronic control unit 8 receives a command to select the fuel in the fuel chamber 3a, the electronic control unit 8 controls the oil outlet of the control valve 4 to communicate with the oil inlet communicating with the fuel chamber 3a. In this way, under the conveying action of the fuel transfer pump 5 and the fuel injection pump 6, the fuel in the fuel chamber 3a is conveyed into the engine block 1 for combustion. When the electronic control unit 8 receives a command to select the fuel in the fuel chamber 3b, the electronic control unit 8 controls the oil outlet of the control valve 4 to communicate with the oil inlet communicating with the fuel chamber 3b. In this way, under the conveying action of the fuel transfer pump 5 and the fuel injection pump 6, the fuel in the fuel chamber 3b is conveyed into the engine block 1 for combustion.

[0096] In this embodiment, the fuel chamber 3a is used to store alternative fuels such as methanol, ethanol, or dimethyl ether, and the fuel chamber 3b is used to store traditional fuels such as diesel or gasoline, enabling the internal combustion engine to select to burn alternative fuels or traditional fuels according to the actual situation. In this way, when the use area of the internal combustion engine has a relatively rich energy storage of alternative fuels, more alternative fuels can be selected for combustion. When the supply of alternative fuels is insufficient, the internal combustion engine can select to burn traditional fuels.

[0097] In a variant of this embodiment, the fuel tank 3 may also have more than three fuel chambers, so that the internal combustion engine can select to burn more than three types of fuels.

[0098] In another variant of this embodiment, the fuel tank 3 may also have only one fuel chamber. In this way, the internal combustion engine can only burn one type of fuel, which can be a traditional fuel or an alternative fuel. In this case, there is no control valve 4 in the fuel injection system P, and the fuel tank 3 is directly connected to the fuel transfer pump 5 through a pipeline.

[0099] In this embodiment, a manual selection button can be set. By operating this button, the driver can select which fuel to use and send the fuel type selection instruction to the electronic control device 8. In a variant of this embodiment, it is also possible to intelligently select which fuel to use by automatically detecting the remaining amount of various fuels and send the fuel type selection instruction to the electronic control device 8.

[0100] The electronic control device 8 is also used to control the glow plug 2 to heat up when receiving the starting instruction of the internal combustion engine, so as to prepare for the combustion of the fuel. The fuel injection pump 6 is used to deliver fuel according to the fuel injection pulse signal sent by the electronic control device 8, so that fuel can be delivered into the cylinder 12 of the internal combustion engine (as shown in the reference Figure 2 ) at a fixed time and in a fixed quantity. When the glow plug 2 is replaced by a spark plug, the electronic control device 8 is also used to control the spark plug to ignite when receiving the starting instruction of the internal combustion engine.

[0101] The electronic control device 8 is also used to control the energization and de-energization of the first solenoid valve in the fuel injection pump 6 and the needle valve 71 in the fuel injector 7.

[0102] In a specific implementation, the fuel injection pump 6 can be a unit pump. A unit pump means that the number of fuel injection pumps is the same as the number of cylinders of the internal combustion engine, and each cylinder is equipped with a fuel injection pump.

[0103] In summary, for the fuel injection pump 6 in the embodiment of the present invention, by setting a sealing ring on the first solenoid valve that opens or closes the second lubrication channel and the second fuel channel in the fuel injector 70, it is possible to prevent the fuel flowing through the first fuel channel from leaking into the first solenoid valve, thereby improving the reliability of the fuel injection pump 6.

[0104] In addition, for the fuel injector 7 in the embodiment of the present invention, by setting a sealing ring on the needle valve 71, it is possible to prevent the fuel flowing through the second fuel channel from leaking into the electromagnetic coil of the needle valve 71, thereby improving the reliability of the fuel injector 7.

[0105] The embodiment of the present invention also provides a fuel injection system, which may include any one of the above-mentioned fuel injection pumps and any one of the above-mentioned fuel injectors.

[0106] The embodiment of the present invention also provides an internal combustion engine, including any one of the above-mentioned fuel injection systems.

[0107] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A fuel injection pump, characterized in that, the fuel injection pump includes: a pump body and a plunger; a plunger hole, a first lubrication passage and a first fuel passage are provided in the pump body; the plunger is movably located in the plunger hole; the pump body further includes: a first switch component; the first lubrication passage and the first fuel passage in the fuel injection pump are opened or closed by using the same first switch component; wherein, a first sealing component is provided on the first switch component, and the first sealing component is made of a material with certain elasticity; the first switch component is a first electromagnetic valve; the first electromagnetic valve includes: an electromagnetic coil, a valve sleeve connected to the electromagnetic coil, and a valve core movably located in the inner cavity of the valve sleeve; the first sealing component is located on the valve core of the first electromagnetic valve and is in close contact with the inner surface of the valve sleeve; the first sealing component is used to isolate the fuel in the first fuel passage from the electromagnetic coil of the first electromagnetic valve.

2. The fuel injection pump according to claim 1, characterized in that, The first sealing component is clamped on the valve core of the first electromagnetic valve.

3. The fuel injection pump according to claim 1, characterized in that, The first lubrication passage includes: an oil outlet passage and an oil inlet passage; the first fuel passage includes: a fuel inlet and return passage and a fuel outlet passage; on the valve core, at a position corresponding to between the first lubrication passage and the fuel outlet passage, a groove is provided, and the first sealing component is clamped in the groove and is in interference fit with the groove.

4. The fuel injection pump according to claim 1, characterized in that, when the valve of the first electromagnetic valve is closed, the first sealing component is located between the first lubrication passage and the fuel outlet passage with the smallest first distance; the first distance is the distance between any first lubrication passage and the fuel outlet passage in the moving direction of the valve core of the first electromagnetic valve.

5. The fuel injection pump according to claim 1, characterized in that, The first sealing component is an O-ring.

6. A fuel injection system, characterized in that, A fuel injection system including the fuel injection pump according to any one of claims 1 to 5, and an injector.

7. An internal combustion engine, characterized in that, A fuel injection system including the fuel injection system according to claim 6.

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