Fuel injection device and fuel filling method for fuel injection device

Abstract

The present invention provides a fuel injection system and a fuel filling method for a fuel injection system that allow for easy fuel filling before starting the fuel injection system. [Solution] A fuel injection device for injecting fuel into an internal combustion engine comprises a fuel pump including a fuel injection unit, a storage unit communicating with the fuel injection unit for storing fuel, a pressure boosting unit configured to increase the pressure of the fuel by being driven in accordance with the operation of the internal combustion engine, and a pressure valve provided between the pressure boosting unit and the storage unit, which opens when the fuel pressure in the pressure boosting unit is equal to or greater than a predetermined pressure; a first fuel supply line for guiding fuel to the pressure boosting unit when the internal combustion engine is in operation; and a second fuel supply line different from the first fuel supply line, which is connected to the pressure boosting unit so as to be able to supply fuel and has a piping connector for connecting to other equipment capable of supplying fuel, and an on / off valve for opening and closing the second fuel supply line.

Description

Technical Field

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[0001] The present disclosure relates to a fuel injection device and a fuel filling method for a fuel injection device.

Background Art

[0002] In a common rail type diesel engine, a common rail (storage unit) for storing high-pressure fuel corresponding to the injection pressure of a fuel injection nozzle is provided, and fuel stored in the common rail is injected from an injector (fuel injection unit) connected to the common rail (see Patent Document 1).

[0003] As shown in Patent Document 1, a fuel pressure pump for pumping high-pressure fuel into a common rail includes a storage chamber for storing fuel, a pump camshaft that rotates by receiving a driving force (rotational force) from a diesel engine, and a plunger that reciprocates in conjunction with the rotation of the pump cam to pressurize the fuel stored in the storage chamber. There is a plunger type fuel pressure pump having these components.

Prior Art Documents

Patent Documents

[0006] In view of the circumstances described above, at least one embodiment of the present disclosure aims to provide a fuel injector and a fuel injector that can be easily filled with fuel before starting the fuel injector. [Means for solving the problem]

[0007] A fuel injection system according to at least one embodiment of the present disclosure is: A fuel injection device for injecting fuel into an internal combustion engine, At least one fuel injection unit configured to inject fuel into the internal combustion engine, A storage unit configured to communicate with at least one fuel injection unit and to store the fuel, A fuel pump including a pressure booster configured to increase the pressure of the fuel by being driven in accordance with the operation of the internal combustion engine, and a pressure valve provided between the pressure booster and the storage unit, configured to open when the pressure of the fuel in the pressure booster is equal to or greater than a predetermined pressure, A first fuel supply line for guiding the fuel to the booster unit during operation of the internal combustion engine, The system includes a second fuel supply line, distinct from the first fuel supply line, which is connected to the booster unit so as to be able to supply the fuel and has a piping connector for connecting to other equipment capable of supplying the fuel, and an on / off valve for opening and closing the second fuel supply line.

[0008] A fuel filling method for a fuel injection system according to at least one embodiment of this disclosure is: A method for refueling a fuel injection system for injecting fuel into an internal combustion engine, before starting the fuel injection system, The fuel injection device is At least one fuel injection unit configured to inject fuel into the internal combustion engine, A storage unit configured to communicate with at least one fuel injection unit and to store the fuel, A fuel pump including a pressure booster configured to increase the pressure of the fuel by being driven in accordance with the operation of the internal combustion engine, and a pressure valve provided between the pressure booster and the storage unit, configured to open when the pressure of the fuel in the pressure booster is equal to or greater than a predetermined pressure, A first fuel supply line for guiding the fuel to the booster unit during operation of the internal combustion engine, A second fuel supply line, distinct from the first fuel supply line, is connected to the booster unit in a manner that allows it to supply the fuel, The fuel filling method for the aforementioned fuel injection device is: A boost pump connection step involves connecting a boost pump configured to increase the pressure of the fuel to a predetermined pressure or higher to the second fuel supply line, The system includes a pumping step of driving the boost pump and pumping the fuel to the boost section at a predetermined pressure or higher via the second fuel supply line. [Effects of the Invention]

[0009] According to at least one embodiment of the present disclosure, a fuel injector and a method for refueling a fuel injector are provided that allow for easy refueling before starting the fuel injector. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram illustrating the configuration of an internal combustion engine system equipped with a fuel injection device according to one embodiment of the present disclosure. [Figure 2] This is a schematic cross-sectional view of a fuel pump according to one embodiment of the present disclosure. [Figure 3] This is a flowchart showing an example of a flow of a fuel filling method for a fuel injection system according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0011] Hereinafter, several embodiments of this disclosure will be described with reference to the attached drawings. However, the dimensions, materials, shapes, relative arrangements, etc., of the components described or shown in the drawings as embodiments are not intended to limit the scope of this disclosure, but are merely illustrative examples.

[0012] (Internal combustion engine system) Figure 1 is a schematic diagram illustrating the configuration of an internal combustion engine system 10 equipped with a fuel injector 1 according to one embodiment of the present disclosure. As shown in Figure 1, the internal combustion engine system 10 comprises an internal combustion engine 2 and a fuel injector 1 for injecting fuel into the internal combustion engine 2. Several embodiments of the fuel injector 1 are mounted on the internal combustion engine system 10. The following embodiments describe the case where the internal combustion engine 2 is a four-stroke engine, but several embodiments of the present disclosure are also applicable when the internal combustion engine 2 is a two-stroke engine.

[0013] (Internal combustion engine) As shown in FIG. 1, the internal combustion engine 2 includes at least one (a plurality in the illustrated example) of cylinders 21. Each of the plurality of cylinders 21 has a combustion chamber 22 for burning fuel. Although not shown, the combustion chamber 22 is formed between a cylinder block and a piston housed inside the cylinder block. The internal combustion engine 2 is configured to burn fuel and combustion gas (e.g., air) in the combustion chamber 22 of each of the plurality of cylinders 21. In one embodiment, the internal combustion engine 2 is a diesel engine and is mounted on a stationary generator having the diesel engine as the main engine.

[0014] (Fuel injection device) As shown in FIG. 1, the fuel injection device 1 includes at least one (a plurality in the illustrated example) of fuel injection parts 3, a storage part 4, a fuel pump 5, a first fuel supply line 6, and a second fuel supply line 7.

[0015] (Fuel injection part) The plurality of fuel injection parts 3 are configured to inject liquid fuel into the combustion chamber 22 of each of the plurality of cylinders 21. The fuel injection part 3 is provided individually for each cylinder 21. In the illustrated embodiment, each of the plurality of fuel injection parts 3 is an injector including a fuel injection valve configured to inject liquid fuel into the combustion chamber 22 of the corresponding cylinder 21.

[0016] (Storage part) The storage part 4 communicates with each of the plurality of fuel injection parts 3 and is configured to store liquid fuel. The storage part 4 has an internal space 41 for storing liquid fuel. In the illustrated embodiment, the fuel injection device 1 includes a plurality of liquid fuel pipes 11 for guiding the liquid fuel stored in the storage part 4 to each of the plurality of fuel injection parts 3. Each of the plurality of liquid fuel pipes 11 has one end connected to the storage part 4 and the other end connected to the fuel injection part 3 corresponding to the liquid fuel pipe 11. The storage part 4 is a common rail to which the plurality of liquid fuel pipes 11 are connected.

[0017] (Fuel pump) As shown in Figure 1, the fuel pump 5 includes a booster unit 51 and a pressure valve 52. The booster unit 51 is configured to boost the pressure of the liquid fuel by being driven in response to the drive of the internal combustion engine 2. The pressure valve 52 is configured to open when the pressure of the liquid fuel in the booster unit 51 is equal to or greater than a predetermined pressure (opening pressure). The pressure valve 52 is configured to close when the pressure of the liquid fuel in the booster unit 51 is less than a predetermined pressure (opening pressure). In the illustrated embodiment, the fuel pump 5 is a high-pressure pump that pumps liquid fuel at or above a predetermined pressure (opening pressure) to the common rail.

[0018] Figure 2 is a schematic cross-sectional view of a fuel pump 5 according to one embodiment of the present disclosure. As shown in Figure 2, the fuel pump 5 includes a plunger 53, a cylinder 54 housing the plunger 53, a cylinder head 55, a tappet roller 56, a camshaft 57, and a housing 58 housing the tappet roller 56 and the camshaft 57.

[0019] The plunger 53 is housed inside the cylinder 54 and reciprocates within the cylinder 54 along the axial direction of the cylinder 54. The cylinder 54 has an opening opposite the camshaft 57 in the axial direction of the cylinder 54 that is covered by the cylinder head 55. The fuel pump 5 has a pressurized chamber 501 defined by the plunger 53, the cylinder 54 and the cylinder head 55. The pressurizing section 51 includes the plunger 53, the cylinder 54 and the cylinder head 55 and has a pressurized chamber 501.

[0020] In the illustrated embodiment, the cylinder 54 and cylinder head 55 are attached to the housing 58, but in some other embodiments, the cylinder 54 and cylinder head 55 may be integrally formed with the housing 58. In this case, the plunger 53 is housed inside the housing 58, and a pressurizing chamber 501 is formed inside the housing 58.

[0021] A cam chamber 502 is formed inside the housing 58 to house the tappet roller 56 and the camshaft 57. The camshaft 57 is mechanically connected to the rotating shaft 23 of the internal combustion engine 2 and rotates in accordance with the rotation of the rotating shaft 23 of the internal combustion engine 2. The camshaft 57 rotates at a predetermined rotation ratio with respect to the rotation of the rotating shaft 23. The tappet roller 56 is in contact with the camshaft 57 and is configured to convert the rotation of the camshaft 57 into linear reciprocating motion and transmit it to the plunger 53. Here, "the tappet roller 56 is in contact with the camshaft 57" includes not only direct contact between the tappet roller 56 and the camshaft 57, but also indirect contact between the tappet roller 56 and the camshaft 57 via an oil film formed by lubricating oil. In the illustrated embodiment, the fuel pump 5 further includes a pump spring 59 for biasing the plunger 53 and the tappet roller 56 toward the camshaft 57.

[0022] In the illustrated embodiment, the fuel pump 5 includes a connecting line 503 that connects the booster section 51 and the storage section 4. The connecting line 503 forms a flow path for guiding liquid fuel from the pressurizing chamber 501 of the booster section 51 to the internal space 41 of the storage section 4. The connecting line 503 includes an outlet 505 for discharging liquid fuel from the pressurizing chamber 501 formed in the wall surface 504 that forms the pressurizing chamber 501 of the cylinder 54 or cylinder head 55.

[0023] In the illustrated embodiment, the pressure valve 52 is located in the pressurizing chamber 501 and has a valve body 521 that opens and closes the outlet 505. In some other embodiments, the pressure valve 52 may also have a valve body located in the connecting line 503 that opens and closes the connecting line 503.

[0024] (First fuel supply line) The first fuel supply line 6 forms a passage for guiding liquid fuel to the pressurizing chamber 501 of the pressurizing section 51 of the fuel pump 5 when the internal combustion engine 2 is in operation. The first fuel supply line 6 is connected to the liquid fuel supply source (in the illustrated example, a storage tank for storing liquid fuel) 100 when the internal combustion engine 2 is in operation. When the internal combustion engine 2 is in operation, liquid fuel is guided from the liquid fuel supply source 100 to the pressurizing chamber 501 of the pressurizing section 51 through the first fuel supply line 6.

[0025] In the illustrated embodiment, the first fuel supply line 6 includes a first supply port 61 for supplying liquid fuel to a pressurized chamber 501 formed by a wall surface 504 forming a pressurized chamber 501 of a cylinder 54 or cylinder head 55. The first fuel supply line 6 includes a first on-off valve 62 provided between the pressurizing section 51 and the storage section 4 for opening and closing the first fuel supply line 6. The first on-off valve 62 may be an on-off valve 62A located in the pressurized chamber 501 and having a valve body 621 for opening and closing the first supply port 61, or it may be an on-off valve 62B provided in the first fuel supply line 6 and having a valve body for opening and closing the first fuel supply line 6. In the illustrated embodiment, the first fuel supply line 6 includes both on-off valve 62A and on-off valve 62B.

[0026] During operation of the internal combustion engine 2, the fuel pump 5 is configured such that the camshaft 57 rotates in accordance with the drive of the internal combustion engine 2, i.e., the rotation of the rotary shaft 23, and the plunger 53 reciprocates in accordance with the rotation of the camshaft 57. The reciprocating motion of the plunger 53 draws liquid fuel F into the pressurizing chamber 501, compresses the drawn-in liquid fuel F, and discharges it from the pressurizing chamber 501. The liquid fuel, which has been pressurized above a predetermined pressure (valve opening pressure) in the pressurizing chamber 501, flows into the storage section 4 and the fuel injection section 3 when the pressure valve 52 opens, and fills the storage section 4 and the fuel injection section 3.

[0027] The pressurizing chamber 501, storage section 4, and fuel injection section 3 of the pressurizing section 51 of the fuel pump 5 may contain air when the internal combustion engine 2 is started. The fuel injection device 1 cannot inject fuel unless the air present in the pressurizing chamber 501, storage section 4, and fuel injection section 3 of the pressurizing section 51 is pushed out and liquid fuel is filled in. During the rotation (cranking) of the rotating shaft 23 when the internal combustion engine 2 is started, the rotational speed of the rotating shaft 23 is insufficient, making it difficult to increase the pressure of the pressurizing chamber 501, where air is present, to a predetermined pressure (valve opening pressure) or higher by the reciprocating motion of the plunger 53. Therefore, when starting the internal combustion engine 2, in order to push out the air from the pressurizing chamber 501, storage section 4, and fuel injection section 3 of the pressurizing section 51 and fill them with liquid fuel, it is necessary to crank the engine multiple times until the starter reaches its heat generation limit.

[0028] (Second fuel supply line) The second fuel supply line 7 forms a passage for guiding liquid fuel at a predetermined pressure (opening pressure) or higher to the pressurizing chamber 501 of the fuel pump 5's booster section 51 when the internal combustion engine 2 is stopped, such as before starting the fuel injection device 1 and the internal combustion engine 2. Before starting the fuel injection device 1 and the internal combustion engine 2, liquid fuel at a predetermined pressure (opening pressure) or higher is guided from the liquid fuel supply source 100 to the booster section 51 (pressurizing chamber 501) through the second fuel supply line 7. The pressurizing chamber 501 of the booster section 51, the fuel injection section 3 and the storage section 4 are filled with liquid fuel at a predetermined pressure (opening pressure) or higher that is guided through the second fuel supply line 7, which pushes out air from the inside.

[0029] The second fuel supply line 7 is different from the first fuel supply line 6 and is connected to supply liquid fuel to the pressurizing chamber 501 of the pressurizing unit 51. In the illustrated embodiment, the second fuel supply line 7 includes a second supply port 71 for supplying liquid fuel to the pressurizing chamber 501 formed in the wall surface 504 that forms the pressurizing chamber 501 of the cylinder 54 or cylinder head 55. The second supply port 71 is formed in a different location on the wall surface 504 from the first supply port 61.

[0030] The second fuel supply line 7 includes a piping connector 8 for connecting to other equipment capable of supplying liquid fuel, and a second on-off valve (on-off valve) 9 for opening and closing the second fuel supply line 7. In the illustrated embodiment, the other equipment capable of supplying liquid fuel is a booster pump 101 for pressurizing liquid fuel drawn from a liquid fuel supply source 100 to a predetermined pressure (valve opening pressure) or higher. The piping connector 8 has a fitting portion that fits into a mating connector 102 on the booster pump 101. By connecting the piping connector 8 and the mating connector 102, it becomes possible to pump liquid fuel from the booster pump 101 to the pressurizing chamber 501 via the second fuel supply line 7.

[0031] The second on-off valve 9 is opened when liquid fuel is being pumped from the booster pump 101 to the pressurized chamber 501, and is closed at all other times, i.e., when liquid fuel is not being pumped from the booster pump 101 to the pressurized chamber 501. At least one of the on-off valves 62A or 62B is closed when liquid fuel is being pumped from the booster pump 101 to the pressurized chamber 501.

[0032] Before starting the fuel injection system 1, the booster unit 51, the storage unit 4, and the fuel injection unit 3 may not be filled with fuel. In particular, before the first start-up after assembling the fuel injection system 1, the booster unit 51, the storage unit 4, and the fuel injection unit 3 are not filled with fuel. The fuel injection system 1 can receive fuel from the other equipment (for example, a booster pump 101 for boosting fuel to a predetermined pressure (valve opening pressure) or higher) through a second fuel supply line 7 by connecting the piping connector 8 to the other equipment. By providing a second fuel supply line 7 that is different from the first fuel supply line 6 that supplies fuel when the internal combustion engine 2 is running, the fuel injection system 1 can easily fill the booster unit 51, the storage unit 4, and the fuel injection unit 3 with fuel through the second fuel supply line 7 before starting the fuel injection system 1.

[0033] In some embodiments of the fuel injection system 1, the second on-off valve 9 described above consists of a check valve 9A configured to suppress backflow from the pressurizing chamber 501 of the pressure boosting unit 51. In the illustrated embodiment, the piping connector 8 is a connector with a check valve. In other words, the check valve 9A is mounted on the piping connector 8.

[0034] By making the second on-off valve 9 a check valve 9A, the valve for opening and closing the second fuel supply line 7 can be opened and closed without external operation such as manual operation or remote operation by electronic equipment, thus simplifying the fuel supply operation through the second fuel supply line 7. In addition, by making the second on-off valve 9 a check valve 9A, backflow from the pressure boosting unit 51 can be suppressed.

[0035] In some embodiments of the fuel injection system 1, the internal combustion engine 2 described above consists of a stationary diesel engine 2A. A typical stationary diesel engine 2A fuel injection system 1 includes a fuel pump 5, but does not include an electric pump for pressurizing and supplying fuel to the pressure booster 51. Even without an electric pump, the fuel injection system 1 can easily fill the pressure booster 51, the storage unit 4, and the fuel injection unit 3 with fuel before starting the fuel injection system 1.

[0036] (Method for refueling a fuel injection system) Figure 3 is a flowchart showing an example of a fuel filling method for a fuel injector 1 according to one embodiment of the present disclosure. The fuel filling method for the fuel injector 1 is a method for filling the fuel injector 1 with fuel before starting the fuel injector 1. A fuel filling method for the fuel injector 1 according to several embodiments comprises a booster pump connection step S1 and a pumping step S2, as shown in Figure 3.

[0037] In step S1, the booster pump is connected to the second fuel supply line 7. The booster pump 101 is configured to boost the liquid fuel to a predetermined pressure (valve opening pressure) or higher. The booster pump 101 is connected to the liquid fuel supply source (storage tank in the illustrated example) 100, and liquid fuel is drawn from the liquid fuel supply source. In the illustrated embodiment, the connection between the second fuel supply line 7 and the booster pump 101 is completed by connecting the piping connector 8 and the mating connector 102.

[0038] In the pumping step S2, the booster pump 101 is driven to pump liquid fuel to the booster unit 51 at a predetermined pressure (valve opening pressure) or higher via the second fuel supply line 7. The liquid fuel is pressurized to a predetermined pressure (valve opening pressure) or higher in the booster pump 101.

[0039] According to the fuel filling method for the fuel injector 1, the booster unit 51, the storage unit 4, and the fuel injection unit 3 may not be filled with fuel before the fuel injector 1 is started. In the booster pump connection step S1, by connecting the booster pump 101 to the second fuel supply line 7 (step S1), fuel can be supplied from the booster pump 101 to the booster unit 51, the storage unit 4, and the fuel injection unit 3 through the second fuel supply line 7 (step S2). The second fuel supply line 7 is easier to connect the booster pump 101 to than the first fuel supply line 6 which supplies fuel when the internal combustion engine 2 is in operation. According to the fuel filling method for the fuel injector 1, the booster unit 51, the storage unit 4, and the fuel injection unit 3 can be easily filled with fuel through the second fuel supply line 7 before the fuel injector 1 is started.

[0040] In some embodiments of the fuel injection device 1 fuel filling method, the above-described pressurization step S2 is performed for a period longer than or equal to a predetermined set period. The set period is the period required to fill the pressurization unit 51, the storage unit 4, and the fuel injection unit 3 with fuel during the pressurization step S2. The set period may be set based on the period required for fuel filling obtained as a result of performing fuel filling on a test fuel injection device 1 through the second fuel supply line 7.

[0041] In the fuel filling method for the fuel injection device 1, by performing the pressurization step S2 for a period longer than the set period, the booster unit 51, the storage unit 4, and the fuel injection unit 3 can be filled with fuel without any shortage.

[0042] A fuel filling method for a fuel injection system 1 according to several embodiments further includes a booster pump disconnection step S3, as shown in Figure 3. The booster pump disconnection step S3 is performed after the pumping step S2. In the booster pump disconnection step S3, the connection between the booster pump 101 and the second fuel supply line 7 is disconnected. In the illustrated embodiment, the connection between the second fuel supply line 7 and the booster pump 101 is disconnected by disconnecting the connection between the piping connector 8 and the mating connector 102. Operation of the fuel injection system 1 is started S4 by closing the second on-off valve 9 after the pumping step S2.

[0043] The booster pump 101 is a piece of equipment that is temporarily connected to the second fuel supply line 7 when filling the fuel injector 1 with fuel, and does not need to be an attachment to the fuel injector 1. In the fuel filling method for the fuel injector 1, fuel can be easily filled into the booster section 51, the storage section 4, and the fuel injection section 3 using the booster pump 101, which is not an attachment to the fuel injector 1. In the fuel filling method for the fuel injector 1, fuel can be filled into multiple fuel injectors 1 by repeatedly using one booster pump 101.

[0044] In some embodiments of the fuel injection system 1 fuel filling method, the above-described booster pump connection step S1, pumping step S2, and booster pump disconnection step S3 are performed at the assembly plant 200 where the fuel injection system 1 is assembled.

[0045] Immediately after assembly at the assembly plant 200, the fuel injector 1 does not have liquid fuel in the pressurizing section 51, storage section 4, and fuel injection section 3, and is filled with air. By performing the fuel filling method for the fuel injector 1 at the assembly plant 200, it can be done when starting the trial run of the fuel injector 1 at the assembly plant 200. By connecting the first fuel supply line 6 and the liquid fuel supply source (storage tank in the illustrated example) 100 before the pressurizing step S2, the trial run of the fuel injector 1 can be started quickly after the pressurizing step S2.

[0046] By performing the fuel filling method for the fuel injection device 1 at the assembly plant 200, the booster pump 101 located at the assembly plant 200 can be used for pumping the liquid fuel in the pumping step S2. In addition, the storage tank 100 located at the assembly plant 200 can be used as the source of liquid fuel. Furthermore, the fuel filling method for the fuel injection device 1 can also be applied before starting the fuel injection device 1 after it has been transported from the assembly plant 200 to the installation site, and before restarting it after it has been shut down.

[0047] In this specification, expressions describing relative or absolute arrangements such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" shall not only describe such arrangements strictly, but also describe states of relative displacement with tolerances or angles or distances that allow for the same function to be achieved. For example, expressions such as "identical," "equal," and "homogeneous" that describe things being in an equal state not only describe a state of being strictly equal, but also describe a state in which there is a tolerance or a difference that is sufficient to achieve the same function. Furthermore, in this specification, expressions describing shapes such as quadrilaterals and cylindrical shapes shall not only represent geometrically precise quadrilaterals and cylindrical shapes, but also shapes that include uneven surfaces, chamfered surfaces, etc., to the extent that the same effect can be achieved. Furthermore, in this specification, the expressions “equipment,” “includes,” or “possess” of a component are not exclusive expressions that exclude the existence of other components.

[0048] This disclosure is not limited to the embodiments described above, but also includes modified forms of the embodiments described above, as well as forms that combine these forms as appropriate.

[0049] The contents described in some of the embodiments above can be understood, for example, as follows:

[0050] 1) A fuel injection system (1) according to at least one embodiment of the present disclosure is A fuel injector (1) for injecting fuel into an internal combustion engine (2), The internal combustion engine (2) is provided with at least one fuel injection unit (3) configured to inject fuel, A storage unit (4) is configured to communicate with at least one fuel injection unit (3) and to store the fuel, A fuel pump (5) includes a pressure booster (51) configured to increase the pressure of the fuel by being driven in response to the operation of the internal combustion engine (2), and a pressure valve (52) provided between the pressure booster (51) and the storage unit (4), configured to open when the pressure of the fuel in the pressure booster (51) is equal to or greater than a predetermined pressure. A first fuel supply line (6) for guiding the fuel to the pressure booster (51) when the internal combustion engine (2) is in operation, The system includes a second fuel supply line (7) which is different from the first fuel supply line (6), and which is connected to the booster unit (51) so as to be able to supply the fuel, and has a piping connector (8) for connecting to other equipment that can supply the fuel, and an on / off valve (9) for opening and closing the second fuel supply line (7).

[0051] According to the configuration described in 1) above, the fuel injector (1) may not be filled with fuel before it is started. The fuel injector (1) can be supplied with fuel from the other equipment (for example, a booster pump (101) for boosting the fuel to a predetermined pressure or higher) via a second fuel supply line (7) by connecting the piping connector (8) to the other equipment. The fuel injector (1) is equipped with a second fuel supply line (7) that is different from the first fuel supply line (6) that supplies fuel when the internal combustion engine (2) is running, so that the fuel injector (1) can be easily filled with fuel from the booster (51), the storage unit (4) and the fuel injector (3) via the second fuel supply line (7) before it is started.

[0052] 2) In some embodiments, the fuel injection device (1) described in 1) above, The on / off valve (9) consists of a check valve (9A) configured to suppress backflow from the pressure boosting unit (51).

[0053] According to the configuration described in 2) above, by using a check valve (9A) instead of an on-off valve (9), the valve for opening and closing the second fuel supply line (7) can be opened and closed without external operation such as manual operation or remote operation by electronic equipment, thus simplifying the fuel supply operation through the second fuel supply line (7). In addition, by using a check valve (9A) instead of an on-off valve (9), backflow from the pressure booster (51) can be suppressed.

[0054] 3) In some embodiments, the fuel injection device (1) described in 1) or 2) above, The internal combustion engine (2) consists of a stationary diesel engine (2A).

[0055] According to the configuration described in 3) above, the fuel injection system (1) of a typical stationary diesel engine (2A) is equipped with a fuel pump (5), but it is not equipped with an electric pump to pressurize and deliver fuel to the booster unit (51). Even without an electric pump, the fuel injection system (1) can be easily filled with fuel into the booster unit (51), the storage unit (4), and the fuel injection unit (3) before starting the fuel injection system (1).

[0056] 4) A fuel filling method for a fuel injection device (1) according to at least one embodiment of the present disclosure is: A method for refueling a fuel injector (1) for injecting fuel into an internal combustion engine (2), before starting the fuel injector (1), The fuel injection device (1) is The internal combustion engine (2) is provided with at least one fuel injection unit (3) configured to inject fuel, A storage unit (4) is configured to communicate with at least one fuel injection unit (3) and to store the fuel, A fuel pump (5) includes a pressure booster (51) configured to increase the pressure of the fuel by being driven in response to the operation of the internal combustion engine (2), and a pressure valve (52) provided between the pressure booster (51) and the storage unit (4), configured to open when the pressure of the fuel in the pressure booster (51) is equal to or greater than a predetermined pressure. A first fuel supply line (6) for guiding the fuel to the pressure booster (51) when the internal combustion engine (2) is in operation, A second fuel supply line (7) is different from the first fuel supply line (6) and is connected to the booster unit (51) so as to be able to supply the fuel, The fuel filling method for the fuel injection device (1) is as follows: A boost pump connection step (S1) is performed by connecting a boost pump (101), configured to raise the fuel to a predetermined pressure or higher, to the second fuel supply line (7), The system includes a pumping step (S2) which drives the boost pump (101) and pumps the fuel at a predetermined pressure or higher to the boost unit (51) via the second fuel supply line (7).

[0057] According to the method described in 4) above, the booster unit (51), storage unit (4), and fuel injection unit (3) may not be filled with fuel before the fuel injection device (1) is started. In the booster pump connection step (S1), by connecting the booster pump (101) to the second fuel supply line (7) (step S1), fuel can be supplied from the booster pump (101) to the booster unit (51), storage unit (4), and fuel injection unit (3) through the second fuel supply line (7) (step S2). The second fuel supply line (7) is easier to connect the booster pump (101) to than the first fuel supply line (6) which supplies fuel when the internal combustion engine (2) is in operation. According to the fuel filling method for the fuel injection device (1), the booster unit (51), storage unit (4), and fuel injection unit (3) can be easily filled with fuel through the second fuel supply line (7) before the fuel injection device (1) is started.

[0058] 5) In some embodiments, a fuel filling method for the fuel injection device (1) described in 4) above, Following the pumping step (S2), a booster pump disconnection step (S3) is included, in which the connection between the booster pump (101) and the second fuel supply line (7) is disconnected.

[0059] According to method 5) above, the booster pump (101) is equipment that is temporarily connected to the second fuel supply line (7) when filling the fuel injector (1), and does not need to be equipment attached to the fuel injector (1). In the fuel filling method for the fuel injector (1), fuel can be easily filled into the booster section (51), the storage section (4), and the fuel injection section (3) using a booster pump (101) that is not equipment attached to the fuel injector (1).

[0060] 6) In some embodiments, a fuel filling method for the fuel injection device (1) described in 4) or 5) above, The aforementioned pumping step (S2) is performed for a period longer than or equal to a predetermined set period.

[0061] According to the method described in 6) above, the set period is the time required to fill the booster unit (51), the storage unit (4), and the fuel injection unit (3) with fuel during the pumping step (S2). In the fuel filling method for the fuel injection device (1), by performing the pumping step (S2) for a period longer than the set period, the booster unit (51), the storage unit (4), and the fuel injection unit (3) can be filled with fuel without any shortage.

[0062] 7) In some embodiments, a fuel filling method for a fuel injection device (1) described in any of 4) to 6) above, The booster pump connection step (S1) and the pumping step (S2) are performed at the assembly plant where the fuel injection device (1) is assembled.

[0063] According to the method described in 7) above, the fuel injector (1) immediately after assembly does not have fuel filled in the booster section (51), storage section (4), and fuel injection section (3). The fuel injector (1) can be filled with fuel when the test run of the fuel injector (1) is started at the assembly plant. In addition, the fuel injector (1) can utilize a booster pump (101) located at the assembly plant for pumping fuel in the pumping step (S2). [Explanation of symbols]

[0064] 1 Fuel injection device 2 Internal Combustion Engine 2A Diesel Engine 3 Fuel injection part 4. Storage section 5. Fuel pump 6. First fuel supply line 7. Second fuel supply line 8. Pipe connectors 9. Second shut-off valve 9A Check valve 10 Internal Combustion Engine Systems 11 Liquid fuel pipe 21 cylinders 22 Combustion chamber 23 Rotating shaft 41 Interior space 51 Booster section 52 Pressure valve 53 Plunger 54 cylinders 55 Cylinder head 56 Tappet roller 57 Camshaft 58 Housing 59 Pump spring 61 1st supply port 62 First shut-off valve 62A, 62B Shut-off valves 71 2nd supply port 100 Sources of liquid fuels 101 Booster pump 102 Mating connector 200 Assembly Plants 501 Pressurized Chamber 502 Cam chamber 503 connection line 504 Wall 505 Outlet 521,621 valve body F liquid fuel

Claims

1. A fuel injection device for injecting fuel into an internal combustion engine, At least one fuel injection unit configured to inject fuel into the internal combustion engine, A storage unit configured to communicate with at least one fuel injection unit and to store the fuel, A fuel pump including a pressure booster configured to increase the pressure of the fuel by being driven in accordance with the operation of the internal combustion engine, and a pressure valve provided between the pressure booster and the storage unit, configured to open when the pressure of the fuel in the pressure booster is equal to or greater than a predetermined pressure, A first fuel supply line for guiding the fuel to the booster unit during operation of the internal combustion engine, A second fuel supply line, distinct from the first fuel supply line, is connected to the booster unit so as to be able to supply the fuel and includes a piping connector for connecting to other equipment capable of supplying the fuel, and an on / off valve for opening and closing the second fuel supply line. Fuel injection device.

2. The aforementioned on-off valve consists of a check valve configured to suppress backflow from the pressure boosting section. The fuel injection device according to claim 1.

3. The aforementioned internal combustion engine consists of a stationary diesel engine. A fuel injection device according to claim 1 or 2.

4. A method for refueling a fuel injection system for injecting fuel into an internal combustion engine, before starting the fuel injection system, The fuel injection device is At least one fuel injection unit configured to inject fuel into the internal combustion engine, A storage unit configured to communicate with at least one fuel injection unit and to store the fuel, A fuel pump including a pressure booster configured to increase the pressure of the fuel by being driven in accordance with the operation of the internal combustion engine, and a pressure valve provided between the pressure booster and the storage unit, configured to open when the pressure of the fuel in the pressure booster is equal to or greater than a predetermined pressure, A first fuel supply line for guiding the fuel to the booster unit during operation of the internal combustion engine, A second fuel supply line, distinct from the first fuel supply line, is connected to the booster unit in a manner that allows it to supply the fuel, The fuel filling method for the aforementioned fuel injection device is: A boost pump connection step involves connecting a boost pump configured to increase the pressure of the fuel to a predetermined pressure or higher to the second fuel supply line, The system includes a pumping step of driving the boost pump and pumping the fuel to the boost section at a predetermined pressure or higher via the second fuel supply line, A method for refueling a fuel injection system.

5. The pumping step is followed by a boost pump disconnection step, in which the boost pump is disconnected from the second fuel supply line. A method for refueling a fuel injection device according to claim 4.

6. The aforementioned pumping step is performed over a period longer than a predetermined set period. A method for refueling a fuel injection device according to claim 4 or 5.

7. The aforementioned booster pump connection step and the aforementioned pumping step are performed at the assembly plant where the fuel injection system was assembled. A method for refueling a fuel injection device according to claim 4 or 5.

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