Fuel injection device and fuel filling method for fuel injection device

Abstract

Provided are a fuel injection device that enables easy filling of fuel before starting the fuel injection device, and a fuel filling method for the fuel injection device. 【Solution means】 A fuel injection device for injecting fuel into an internal combustion engine includes a fuel injection unit, a storage unit that communicates with the fuel injection unit and stores fuel, a boosting unit configured to boost the fuel by being driven in response to the drive of the internal combustion engine, and a pressure valve provided between the boosting unit and the storage unit that opens when the pressure of the fuel in the boosting unit is equal to or higher than a predetermined pressure. The fuel injection device further includes a fuel pump including the pressure valve, a first fuel supply line for guiding fuel to the boosting unit during operation of the internal combustion engine, and a second fuel supply line different from the first fuel supply line. The second fuel supply line is connected to the boosting unit so as to be able to supply fuel, and has a pipe connector for connecting to other devices capable of supplying fuel, and an on-off valve for opening and closing the second fuel supply line.

Description

Technical Field

[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 section) 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 section) 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 the 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.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The reservoir chamber, common rail, and injector may contain air when the internal combustion engine starts. Fuel injection cannot be performed unless the air present in the reservoir chamber, common rail, and injector is pushed out and the liquid fuel is filled. During the rotation (cranking) of the rotating shaft of the internal combustion engine at the start of the internal combustion engine, the rotational speed of the rotating shaft is insufficient, and there is a risk that the reservoir chamber with air cannot be sufficiently pressurized by the reciprocating motion of the plunger. Therefore, in order to push out the air from the reservoir chamber, common rail, and injector and fill the fuel at the start of the internal combustion engine, it is necessary to perform long-time cranking multiple times. For this reason, it is desired to fill the reservoir chamber, common rail, and injector with fuel before starting the internal combustion engine.

[0006] In view of the above circumstances, at least one embodiment of the present disclosure aims to provide a fuel injection device that can be easily filled with fuel before starting the fuel injection device and a fuel filling method for the fuel injection device.

Means for Solving the Problems

[0007] The fuel injection device 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 part configured to inject fuel into the internal combustion engine, a reservoir part communicating with the at least one fuel injection part and configured to store the fuel, a pressure boosting part configured to boost the fuel by being driven in response to the drive of the internal combustion engine, and a pressure valve provided between the pressure boosting part and the reservoir part and configured to open the valve when the pressure of the fuel in the pressure boosting part is equal to or higher than a predetermined pressure, including a fuel pump, a first fuel supply line for guiding the fuel to the pressure boosting part during the operation of the internal combustion engine, A second fuel supply line different from the first fuel supply line, the second fuel supply line being connectable to supply the fuel to the boosting section and having a pipe connector for connecting to other equipment capable of supplying the fuel, and a switching valve for opening and closing the second fuel supply line.

[0008] A fuel filling method for a fuel injection device according to at least one embodiment of the present disclosure is A fuel filling method for a fuel injection device for filling fuel before starting a fuel injection device for injecting fuel into an internal combustion engine, The fuel injection device is At least one fuel injection section configured to inject fuel into the internal combustion engine, A storage section communicating with the at least one fuel injection section and configured to store the fuel, A fuel pump including a boosting section configured to boost the fuel by being driven in response to driving of the internal combustion engine, and a pressure valve provided between the boosting section and the storage section and configured to open when the pressure of the fuel in the boosting section is equal to or higher than a predetermined pressure, A first fuel supply line for guiding the fuel to the boosting section during operation of the internal combustion engine, A second fuel supply line different from the first fuel supply line, the second fuel supply line being connectable to supply the fuel to the boosting section, The fuel filling method of the fuel injection device is A boosting pump connection step of connecting a boosting pump configured to boost the fuel to equal to or higher than the predetermined pressure to the second fuel supply line, A pumping step of driving the boosting pump and pumping the fuel equal to or higher than the predetermined pressure to the boosting section via the second fuel supply line.

Advantages of the Invention

[0009] According to at least one embodiment of the present disclosure, there are provided a fuel injection device and a fuel filling method for a fuel injection device that can easily fill fuel before starting the fuel injection device.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

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

[0012] (Internal Combustion Engine System) FIG. 1 is a schematic configuration diagram schematically showing the configuration of an internal combustion engine system 10 including a fuel injection device 1 according to an embodiment of the present disclosure. As shown in FIG. 1, the internal combustion engine system 10 includes an internal combustion engine 2 and a fuel injection device 1 for injecting fuel into the internal combustion engine 2. The fuel injection device 1 according to some embodiments is mounted on the internal combustion engine system 10. In the following embodiments, the case where the internal combustion engine 2 is a four-stroke engine will be described, but some embodiments of the present disclosure are also applicable to the case where 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 a certain 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 respectively. 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. One end of each of the plurality of liquid fuel pipes 11 is connected to the storage part 4, and the other end of the liquid fuel pipe 11 is connected to the corresponding fuel injection part 3. 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 FIG. 1, the fuel pump 5 includes a pressure boosting section 51 and a pressure valve 52. The pressure boosting section 51 is configured to boost the liquid fuel by being driven in response to the driving of the internal combustion engine 2. The pressure valve 52 is configured to open when the pressure of the liquid fuel in the pressure boosting section 51 is equal to or higher than a predetermined pressure (valve opening pressure). The pressure valve 52 is configured to close when the pressure of the liquid fuel in the pressure boosting section 51 is lower than the predetermined pressure (valve opening pressure). In the illustrated embodiment, the fuel pump 5 is a high-pressure pump that pumps liquid fuel equal to or higher than the predetermined pressure (valve opening pressure) to the common rail.

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

[0019] The plunger 53 is housed inside the cylinder 54 and is configured to reciprocate along the axial direction of the cylinder 54 inside the cylinder 54. An opening of the cylinder 54 on the side opposite to the camshaft 57 in the axial direction of the cylinder 54 is covered by the cylinder head 55. In the fuel pump 5, a pressurizing chamber 501 defined by the plunger 53, the cylinder 54, and the cylinder head 55 is formed. The pressure boosting section 51 includes the plunger 53, the cylinder 54, and the cylinder head 55 and has the pressurizing chamber 501.

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

[0021] Inside the housing 58, a cam chamber 502 for accommodating the tappet roller 56 and the camshaft 57 is formed. The camshaft 57 is mechanically connected to the rotating shaft 23 of the internal combustion engine 2 and is configured to rotate in response to the rotation of the rotating shaft 23 of the internal combustion engine 2. The camshaft 57 is configured to rotate at a predetermined rotation ratio with respect to the rotation of the rotating shaft 23. The tappet roller 56 abuts against the camshaft 57 and is configured to convert the rotation of the camshaft 57 into a linear reciprocating motion and transmit it to the plunger 53. Here, "the tappet roller 56 abuts against the camshaft 57" includes not only the direct contact of the tappet roller 56 with the camshaft 57 but also the indirect contact of the tappet roller 56 with the camshaft 57 through 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 side.

[0022] In the illustrated embodiment, the fuel pump 5 includes a connection line 503 connecting the pressure boosting portion 51 and the storage portion 4. The connection line 503 forms a flow path for guiding the liquid fuel from the pressurizing chamber 501 of the pressure boosting portion 51 to the internal space 41 of the storage portion 4. The connection line 503 includes a discharge port 505 for discharging the liquid fuel from the pressurizing chamber 501 formed in the wall surface 504 forming the pressurizing chamber 501 of the cylinder 54 or the cylinder head 55.

[0023] In the illustrated embodiment, the pressure valve 52 is disposed in the pressurizing chamber 501 and has a valve body 521 for opening and closing the discharge port 505. In some other embodiments, the pressure valve 52 may be provided in the connection line 503 and have a valve body for opening and closing the connection line 503.

[0024] (First Fuel Supply Line) The first fuel supply line 6 forms a flow path for guiding liquid fuel to the pressure chamber 501 of the pressure boosting section 51 of the fuel pump 5 during the operation of the internal combustion engine 2. The first fuel supply line 6 is connected to a supply source of liquid fuel (in the illustrated example, a storage tank 100 for storing liquid fuel) 100 during the operation of the internal combustion engine 2. During the operation of the internal combustion engine 2, liquid fuel is guided from the supply source 100 of liquid fuel to the pressure chamber 501 of the pressure boosting 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 the pressure chamber 501 formed by the wall surface 504 forming the pressure chamber 501 of the cylinder 54 or the cylinder head 55. The first fuel supply line 6 is provided between the pressure boosting section 51 and the storage section 4 and includes a first on-off valve 62 for opening and closing the first fuel supply line 6. The first on-off valve 62 may be an on-off valve 62A having a valve body 621 disposed in the pressure chamber 501 and opening and closing the first supply port 61, or 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 the on-off valve 62A and the on-off valve 62B.

[0026] During the operation of the internal combustion engine 2, the fuel pump 5 is configured such that the camshaft 57 rotates in response to the drive of the internal combustion engine 2, that is, the rotation of the rotating shaft 23, and the plunger 53 reciprocates in response to the rotation of the camshaft 57. By the reciprocating motion of the plunger 53, liquid fuel F is inhaled into the pressure chamber 501, and the inhaled liquid fuel F is compressed and discharged from the pressure chamber 501. The liquid fuel pressurized to a predetermined pressure (valve opening pressure) or higher in the pressure chamber 501 flows into the storage section 4 and the fuel injection section 3 by the opening of the pressure valve 52, and the storage section 4 and the fuel injection section 3 are filled.

[0027] At the start of the internal combustion engine 2, the pressure chamber 501 of the pressure boosting section 51 of the fuel pump 5, the storage section 4, and the fuel injection section 3 may contain air. The fuel injection device 1 cannot perform fuel injection unless the air present in the pressure chamber 501 of the pressure boosting section 51, the storage section 4, and the fuel injection section 3 is expelled and the liquid fuel is filled. At the start of the internal combustion engine 2, during the rotation (cranking) of the rotating shaft 23, the rotational speed of the rotating shaft 23 is insufficient, and it is difficult to boost the pressure chamber 501 where air exists to a predetermined pressure (valve opening pressure) or higher by the reciprocating motion of the plunger 53. Therefore, at the start of the internal combustion engine 2, in order to expel the air from the pressure chamber 501 of the pressure boosting section 51, the storage section 4, and the fuel injection section 3 and fill it with liquid fuel, it is necessary to perform cranking multiple times until the heat generation limit time of the starter.

[0028] (Second fuel supply line) The second fuel supply line 7 forms a flow path for guiding liquid fuel at a predetermined pressure (valve opening pressure) or higher to the pressure chamber 501 of the pressure boosting section 51 of the fuel pump 5 when the internal combustion engine 2 is stopped, such as before the start of the fuel injection device 1 and the internal combustion engine 2. Before the start of the fuel injection device 1 and the internal combustion engine 2, liquid fuel at a predetermined pressure (valve opening pressure) or higher is guided from the liquid fuel supply source 100 through the second fuel supply line 7 to the pressure boosting section 51 (pressure chamber 501). The pressure chamber 501 of the pressure boosting section 51, the fuel injection section 3, and the storage section 4 are filled with the liquid fuel by having the air pushed out from the inside by the liquid fuel at a predetermined pressure (valve opening pressure) or higher guided through the second fuel supply line 7.

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

[0030] The second fuel supply line 7 has a pipe 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 boosting the liquid fuel led from a liquid fuel supply source 100 to a pressure equal to or higher than a predetermined pressure (valve opening pressure). The pipe connector 8 has a fitting portion that fits into a mating connector 102 provided in the booster pump 101. By connecting the pipe connector 8 and the mating connector 102, it becomes possible to pump the 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 pumping the liquid fuel from the booster pump 101 to the pressurizing chamber 501, and is closed otherwise, that is, when not pumping the liquid fuel from the booster pump 101 to the pressurizing chamber 501. At least one of the on-off valve 62A or the on-off valve 62B is closed when pumping the liquid fuel from the booster pump 101 to the pressurizing chamber 501.

[0032] Before the start of the fuel injection device 1, the pressurizing section 51, the storage section 4, and the fuel injection section 3 may not be filled with fuel. In particular, before the first start after assembling the fuel injection device 1, the pressurizing section 51, the storage section 4, and the fuel injection section 3 are not filled with fuel. The fuel injection device 1 can supply fuel from the other equipment to the pressurizing section 51, the storage section 4, and the fuel injection section 3 through the second fuel supply line 7 by connecting the pipe connector 8 to the other equipment (for example, a booster pump 101 for boosting the fuel to a pressure equal to or higher than a predetermined pressure (valve opening pressure)). By providing a second fuel supply line 7 different from the first fuel supply line 6 that supplies fuel during the operation of the internal combustion engine 2, the fuel injection device 1 can easily fill the pressurizing section 51, the storage section 4, and the fuel injection section 3 with fuel through the second fuel supply line 7 before the start of the fuel injection device 1.

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

[0034] By using the check valve 9A as the second on-off valve 9, it is possible to open and close the valve for opening and closing the second fuel supply line 7 without performing an external operation such as manual operation or remote operation by an electronic device. Thus, the fuel supply operation through the second fuel supply line 7 becomes easy. Also, by using the check valve 9A as the second on-off valve 9, backflow from the pressure boosting section 51 can be suppressed.

[0035] In the fuel injection device 1 according to some embodiments, the above-described internal combustion engine 2 comprises a stationary diesel engine 2A. A fuel injection device 1 for a general stationary diesel engine 2A includes a fuel pump 5, but does not include an electric pump for pumping fuel to the pressure boosting section 51. Even when the fuel injection device 1 does not include an electric pump, fuel can be easily filled into the pressure boosting section 51, the storage section 4, and the fuel injection section 3 before starting the fuel injection device 1.

[0036] (Fuel filling method of fuel injection device) FIG. 3 is a flowchart showing an example of the flow of a fuel filling method of the fuel injection device 1 according to an embodiment of the present disclosure. The fuel filling method of the fuel injection device 1 is a method for filling the fuel injection device 1 with fuel before starting the fuel injection device 1. The fuel filling method of the fuel injection device 1 according to some embodiments includes a pressure boosting pump connection step S1 and a pumping step S2, as shown in FIG. 3.

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

[0038] In the pumping step S2, the boost pump 101 is driven to pump the liquid fuel at a predetermined pressure (valve opening pressure) or higher to the boosting section 51 through the second fuel supply line 7. The liquid fuel is boosted to a predetermined pressure (valve opening pressure) or higher in the boost pump 101.

[0039] According to the fuel filling method of the fuel injection device 1, before the start of the fuel injection device 1, the boosting section 51, the storage section 4, and the fuel injection section 3 may not be filled with fuel. In the boost pump connection step S1, by connecting the boost pump 101 to the second fuel supply line 7 (step S1), fuel can be supplied from the boost pump 101 to the boosting section 51, the storage section 4, and the fuel injection section 3 through the second fuel supply line 7 (step S2). The second fuel supply line 7 is easier to connect to the boost pump 101 than the first fuel supply line 6 that supplies fuel during the operation of the internal combustion engine 2. According to the fuel filling method of the fuel injection device 1, before the start of the fuel injection device 1, the boosting section 51, the storage section 4, and the fuel injection section 3 can be easily filled with fuel through the second fuel supply line 7.

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

[0041] In the fuel filling method of the fuel injection device 1, by performing the pressure feeding step S2 for a period equal to or longer than the set period, the boosting section 51, the storage section 4, and the fuel injection section 3 can be filled with fuel without shortage.

[0042] The fuel filling method of the fuel injection device 1 according to some embodiments further includes a pressure pump connection release step S3 as shown in FIG. 3. The pressure pump connection release step S3 is performed after the pressure feeding step S2. In the pressure pump connection release step S3, the connection between the pressure pump 101 and the second fuel supply line 7 is released. In the illustrated embodiment, the connection between the second fuel supply line 7 and the pressure pump 101 is released by releasing the connection between the pipe connector 8 and the mating connector 102. The start of operation S4 of the fuel injection device 1 becomes possible by closing the second on-off valve 9 after the pressure feeding step S2.

[0043] The pressure pump 101 is a facility that is temporarily connected to the second fuel supply line 7 when filling the fuel injection device 1 with fuel, and it is not necessary for the pressure pump 101 to be an attached facility of the fuel injection device 1. In the fuel filling method of the fuel injection device 1, the boosting section 51, the storage section 4, and the fuel injection section 3 can be easily filled with fuel by using the pressure pump 101 that is not an attached facility of the fuel injection device 1. In the fuel filling method of the fuel injection device 1, a single pressure pump 101 can be repeatedly used to fill a plurality of fuel injection devices 1 with fuel.

[0044] In the fuel filling method of the fuel injection device 1 according to some embodiments, the above-described pressure pump connection step S1, pressure feeding step S2, and pressure pump connection release step S3 are performed at the assembly factory 200 where the fuel injection device 1 is assembled.

[0045] Immediately after assembly in the assembly plant 200, the fuel injection device 1 has no liquid fuel filled in the pressure boosting section 51, the storage section 4, and the fuel injection section 3, and is filled with air. By performing the fuel filling method of the fuel injection device 1 in the assembly plant 200, it can be carried out when starting the test run of the fuel injection device 1 in the assembly plant 200. Before the pressure feeding step S2, by connecting the first fuel supply line 6 and the supply source of the liquid fuel (in the illustrated example, the storage tank) 100, the test run of the fuel injection device 1 can be promptly started after the pressure feeding step S2.

[0046] By performing the fuel filling method of the fuel injection device 1 in the assembly plant 200, the pressure boosting pump 101 placed in the assembly plant 200 can be used for the pressure feeding of the liquid fuel in the pressure feeding step S2. Also, the storage tank 100 placed in the assembly plant 200 can be used as the supply source of the liquid fuel. Note that the fuel filling method of the fuel injection device 1 is also applicable before starting the fuel injection device 1 transferred from the assembly plant 200 to the installation location and before restarting after the operation is stopped.

[0047] In this specification, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only strictly represent such arrangements, but also represent a state of being relatively displaced with tolerances or at an angle or distance that allows the same function to be obtained. For example, expressions representing that things such as "identical", "equal", and "homogeneous" are in an equal state not only strictly represent an equal state, but also represent a state in which there are tolerances or differences that allow the same function to be obtained. Also, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent the shapes such as a rectangular shape or a cylindrical shape in a geometrically strict sense, but also represent shapes including concave and convex portions, chamfered portions, etc. within a range where the same effect can be obtained. Also, in this specification, the expression of a component "comprising", "including", or "having" is not an exclusive expression that excludes the existence of other components.

[0048] The present disclosure is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

[0049] The content described in some of the above-described embodiments can be understood as follows, for example.

[0050] 1) The fuel injection device (1) according to at least one embodiment of the present disclosure is a fuel injection device (1) for injecting fuel into an internal combustion engine (2), at least one fuel injection part (3) configured to inject fuel into the internal combustion engine (2), a storage part (4) that communicates with the at least one fuel injection part (3) and is configured to store the fuel, a pressure boosting part (51) configured to boost the fuel by being driven in response to the driving of the internal combustion engine (2), and a pressure valve (52) provided between the pressure boosting part (51) and the storage part (4) and configured to open when the pressure of the fuel in the pressure boosting part (51) is equal to or higher than a predetermined pressure, a fuel pump (5) including, a first fuel supply line (6) for guiding the fuel to the pressure boosting part (51) during operation of the internal combustion engine (2), a second fuel supply line (7) different from the first fuel supply line (6), which is connected to the pressure boosting part (51) so as to be able to supply the fuel, and a pipe connector (8) for connecting to other devices capable of supplying the fuel, and a second fuel supply line (7) having an opening / closing valve (9) for opening and closing the second fuel supply line (7).

[0051] According to the configuration of 1) above, before the start of the fuel injection device (1), the pressure boosting section (51), the storage section (4), and the fuel injection section (3) may not be filled with fuel. The fuel injection device (1) can supply fuel from the other device to the pressure boosting section (51), the storage section (4), and the fuel injection section (3) through the second fuel supply line (7) by connecting the pipe connector (8) to the other device (for example, the pressure boosting pump (101) for boosting the fuel to the predetermined pressure or higher). By providing the fuel injection device (1) with a second fuel supply line (7) different from the first fuel supply line (6) for supplying fuel during the operation of the internal combustion engine (2), before the start of the fuel injection device (1), the pressure boosting section (51), the storage section (4), and the fuel injection section (3) can be easily filled with fuel through the second fuel supply line (7).

[0052] 2) In some embodiments, it is the fuel injection device (1) described in 1) above, The on-off valve (9) comprises a check valve (9A) configured to suppress backflow from the pressure boosting section (51).

[0053] According to the configuration of 2) above, by using the on-off valve (9) as the check valve (9A), the valve for opening and closing the second fuel supply line (7) can be opened and closed without performing an external operation such as manual operation or remote operation by an electronic device, so that the fuel supply work through the second fuel supply line (7) becomes easy. Further, by using the on-off valve (9) as the check valve (9A), backflow from the pressure boosting section (51) can be suppressed.

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

[0055] According to the configuration of 3) above, the fuel injection device (1) of a general stationary diesel engine (2A) includes a fuel pump (5), but does not include an electric pump for pumping fuel to the pressure boosting section (51). Even when the fuel injection device (1) does not include an electric pump, fuel can be easily filled into the pressure boosting section (51), the storage section (4), and the fuel injection section (3) before starting the fuel injection device (1).

[0056] 4) The fuel filling method of the fuel injection device (1) according to at least one embodiment of the present disclosure is A fuel filling method of a fuel injection device (1) for filling fuel before starting a fuel injection device (1) for injecting fuel into an internal combustion engine (2), The fuel injection device (1) is At least one fuel injection section (3) configured to inject fuel into the internal combustion engine (2), A storage section (4) communicating with the at least one fuel injection section (3) and configured to store the fuel, A pressure boosting section (51) configured to boost the fuel by being driven in response to the driving of the internal combustion engine (2), and a pressure valve (52) provided between the pressure boosting section (51) and the storage section (4) and configured to open when the pressure of the fuel in the pressure boosting section (51) is equal to or higher than a predetermined pressure, including a fuel pump (5), A first fuel supply line (6) for guiding the fuel to the pressure boosting section (51) during operation of the internal combustion engine (2), A second fuel supply line (7) different from the first fuel supply line (6), and a second fuel supply line (7) connected to be able to supply the fuel to the pressure boosting section (51), The fuel filling method of the fuel injection device (1) is A pressure boosting pump connection step (S1) of connecting a pressure boosting pump (101) configured to boost the fuel to equal to or higher than the predetermined pressure to the second fuel supply line (7), A pressure pumping step (S2) of driving the pressure boosting pump (101) and pumping the fuel equal to or higher than the predetermined pressure to the pressure boosting section (51) via the second fuel supply line (7).

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

[0058] 5) In some embodiments, it is the fuel filling method of the fuel injection device (1) described in 4) above, After the pumping step (S2), it includes a boosting pump connection release step (S3) of releasing the connection between the boosting pump (101) and the second fuel supply line (7).

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

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

[0061] According to the method of 6) above, in the fuel pumping step (S2), the period required to fill the pressure boosting section (51), the storage section (4), and the fuel injection section (3) with fuel is set as the set period. In the fuel filling method of the fuel injection device (1), by performing the fuel pumping step (S2) for a period equal to or longer than the set period, the pressure boosting section (51), the storage section (4), and the fuel injection section (3) can be filled with fuel without shortage.

[0062] 7) In some embodiments, it is a fuel filling method of the fuel injection device (1) according to any one of 4) to 6) above, the pressure boosting pump connection step (S1) and the fuel pumping step (S2) are carried out in the assembly factory where the fuel injection device (1) is assembled.

[0063] According to the method of 7) above, the fuel injection device (1) immediately after assembly is not filled with fuel in the pressure boosting section (51), the storage section (4), and the fuel injection section (3). The fuel filling method of the fuel injection device (1) can be carried out when starting the test run of the fuel injection device (1) in the assembly factory. Also, for the fuel pumping in the fuel pumping step (S2), the pressure boosting pump (101) placed in the assembly factory can be used.

Explanation of Signs

[0064] 1 Fuel injection device 2 Internal combustion engine 2A Diesel engine 3 Fuel injection section 4 Storage section 5 Fuel pump 6 First fuel supply line 7 Second fuel supply line 8 Pipe connector 9 Second on-off valve 9A Check valve 10 Internal combustion engine system 11 Liquid fuel pipe 21 Cylinder 22 Combustion chamber 23 Rotating shaft 41 Internal space 51 Pressure boosting section 52 Pressure valve 53 Plunger 54 Cylinder 55 Cylinder head 56 Tappet roller 57 Camshaft 58 Housing 59 Spring for pump 61 First supply port 62 First on-off valve 62A, 62B On-off valves 71 Second supply port 100 Supply source of liquid fuel 101 Boost pump 102 Mate connector 200 Assembly plant 501 Pressurization chamber 502 Cam chamber 503 Connection line 504 Wall surface 505 Discharge port 521, 621 Valve bodies F Liquid fuel

Claims

1. A fuel injection device for injecting fuel into an internal combustion engine, comprising: at least one fuel injection unit configured to inject fuel into the internal combustion engine; a storage unit communicating with the at least one fuel injection unit and configured to store the fuel; a pressure boosting unit configured to boost the fuel by being driven in response to driving of the internal combustion engine, and a pressure valve provided between the pressure boosting unit and the storage unit and configured to open when the pressure of the fuel in the pressure boosting unit is equal to or higher than a predetermined pressure, the fuel pump including the pressure valve; a first fuel supply line for guiding the fuel to the pressure boosting unit during operation of the internal combustion engine; a second fuel supply line different from the first fuel supply line, the second fuel supply line being connectable to the pressure boosting unit to supply the fuel thereto, and being connectable to another device capable of supplying the fuel at a pressure equal to or higher than the predetermined pressure to the pressure boosting unit before starting of the fuel injection device, and an on-off valve for opening and closing the second fuel supply line, the on-off valve being configured to open when supplying the fuel to the pressure boosting unit and to close when not supplying the fuel to the pressure boosting unit; A fuel injection device.

2. The on-off valve comprises a check valve configured to suppress backflow from the pressure boosting unit. The fuel injection device according to claim 1.

3. The internal combustion engine comprises a stationary diesel engine. The fuel injection device according to claim 1 or 2.

4. A fuel filling method of a fuel injection device for filling fuel before starting of a fuel injection device for injecting fuel into an internal combustion engine, wherein the fuel injection device comprises: at least one fuel injection unit configured to inject fuel into the internal combustion engine; a storage unit communicating with the at least one fuel injection unit and configured to store the fuel; a pressure boosting unit configured to boost the fuel by being driven in response to driving of the internal combustion engine, and a pressure valve provided between the pressure boosting unit and the storage unit and configured to open when the pressure of the fuel in the pressure boosting unit is equal to or higher than a predetermined pressure, the fuel pump including the pressure valve; a first fuel supply line for guiding the fuel to the pressure boosting unit during operation of the internal combustion engine; a second fuel supply line different from the first fuel supply line and connectable to the pressure boosting unit to supply the fuel thereto; The fuel filling method of the fuel injection device comprises: A boosting pump connection step of connecting a boosting pump configured to boost the fuel to a pressure equal to or higher than the predetermined pressure to the second fuel supply line; A pumping step of driving the boosting pump and pumping the fuel at a pressure equal to or higher than the predetermined pressure to the boosting section via the second fuel supply line. A fuel filling method for a fuel injection device. **Claim 5** After the pumping step, a boosting pump connection release step of releasing the connection between the boosting pump and the second fuel supply line is provided. The fuel filling method for a fuel injection device according to claim 4. **Claim 6** The pumping step is performed for a period equal to or longer than a preset setting period. The fuel filling method for a fuel injection device according to claim 4 or 5. **Claim 7** The boosting pump connection step and the pumping step are performed at an assembly factory where the fuel injection device is assembled. The fuel filling method for a fuel injection device according to claim 4 or 5.

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