Injector Vibration System

Abstract

To provide an injector vibration system capable of appropriately dripping condensed water adhering to an injector tip after stop of an internal combustion engine during the operation.SOLUTION: An injector unit 3a is inserted into an insertion hole 9a of a cylinder head 9, and has an injector body 5, a case part 4 and a compression coil spring 6. The injector body 5 is slidable in an insertion hole 4h, and the compression coil spring 6 is disposed between a magnetic body part 5b and an electromagnet part 4c, and is expandable and contractible. When the internal combustion engine 10 is stopped, the injector body 5 is vibrated along an axial direction of a cylindrical part 4a by controlling energization of the electromagnet part 4c after a predetermined period passes after stop. When the internal combustion engine 10 is in an operational state, the electromagnet part 4c is energized, and kept stationary in a state that the injector body 5 moves downward. Fuel filled in the case part 4 flows from a fuel pipe connected to a lid part 4b to a fuel inflow port 5a.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an injector vibration system that vibrates an injector that injects fuel into a combustion chamber of an internal combustion engine. [Background technology]

[0002] In direct-injection internal combustion engines such as diesel engines, the tip of an injector (fuel injection valve) extends into the combustion chamber, and the injection holes for injecting fuel are located within the combustion chamber. Therefore, after the internal combustion engine is stopped, sulfuric acid-containing condensed water, which is generated by condensation of sulfur and water vapor remaining in the combustion chamber, may adhere to the tip of the injector and corrode the tip of the injector. If this corrosion by sulfuric acid extends to the injection hole of the injector and the diameter of the injection hole increases, fuel atomization will not be performed properly, which will undesirably cause a decrease in fuel efficiency, etc. Therefore, it is desirable to prevent this corrosion.

[0003] For example, Patent Document 1 discloses an injector with a tapered tip. Specifically, the injector is formed so that the longitudinal cross section of a predetermined area below the opening end of the injection hole tapers downward and the edge line relative to the central axis forms an acute angle. It also discloses that the tapered tip of the injector may be covered with a hydrophilic coating. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-109225 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the injector described in Patent Document 1, some of the condensed water generated by dew condensation grows until it falls off under its own weight, while other condensed water becomes tiny particles that do not fall off under their own weight, so not all of the condensed water can necessarily drip off.To prevent corrosion, it is desirable to allow the condensed water adhering to the outer surface to drip off regardless of its amount or size.

[0006] An object of the present invention is to provide an injector vibration system that can more appropriately drip condensed water adhering to the tip of an injector after an internal combustion engine that has been running is stopped. [Means for solving the problem]

[0007] In order to solve the above problems, the injector vibration system according to the present disclosure is an injector vibration system that vibrates an injector that injects fuel into a combustion chamber of an internal combustion engine, the injector vibration system comprising: an injector unit that is inserted into an insertion hole that extends in a vertical direction and is formed in a cylinder head so as to communicate with the combustion chamber; and a control device that controls the supply of electricity to the injector unit, wherein the injector unit has the injector, a case that houses a part of the injector, and an elastic member that applies a biasing force to the injector, and the case has a cylindrical part made of a non-magnetic material that extends in a vertical direction along the insertion hole, a lid that seals an upper part of the cylindrical part, and an electromagnet part that is attached to a lower part of the cylindrical part, and a through hole is formed in the electromagnet part in the axial direction of the cylindrical part, which is the central axis of the cylindrical part, and the injector is inserted into the through hole while a gap between the injector and the through hole is sealed with a seal member, and the injector is slidable relative to the electromagnet part along the axial direction of the cylindrical part. and an injector vibration unit configured to, when the internal combustion engine is in operation, control energization of the electromagnet unit so that the injector, which is slidable in the axial direction of the cylindrical portion, is stationary and, when the internal combustion engine is in operation, control energization of the electromagnet unit so that the injector, which is slidable in the axial direction of the cylindrical portion, is stationary, and, when the internal combustion engine is in operation, control energization of the electromagnet unit so that the injector, which is slidable in the axial direction of the cylindrical portion, is stationary, when the internal combustion engine is in operation, is stopped, control energization of the electromagnet unit so that the injector, which is slidable in the axial direction of the cylindrical portion, is stationary,

[0008] According to this, after a predetermined period of time has passed since the internal combustion engine was stopped, condensed water adheres to the lower end of the injector that protrudes below the electromagnet, but the vibration of the injector itself forcibly shakes off the adhered condensed water, so that all the condensed water can be dripped off regardless of the amount or size of the condensed water adhering to the outer surface.

[0009] In the injector vibration system, the elastic member is a compression coil spring having an inner diameter larger than an outer diameter of the injector, and is provided between the magnetic material portion and the electromagnet portion with the injector passing through its center; the case portion has a stopper on either the cylindrical portion or the lid portion; when the compression coil spring returns from a compressed state to its natural length, the injector provided with the magnetic material portion moves in the axial direction of the cylindrical portion and collides with the stopper to stop; and the control device, when the internal combustion engine is in an operating state, maintains the supply of electricity to the electromagnet portion by means of the injector stationary portion, Department The electromagnet Department and the injector is stopped in a state in which the compression coil spring is compressed by the injector vibration unit, and when the internal combustion engine that was in operation is stopped by the injector vibration unit, the electromagnet unit may be energized and de-energized at least once after a predetermined period has elapsed since the engine was stopped, thereby vibrating the injector along the axial direction of the cylindrical unit.

[0010] This causes the injector to collide with the stopper once for each vibration of the injector. In other words, the vibration of the injector itself forcibly shakes off any condensed water that has adhered to the stopper, and the impact of the collision also scatters the condensed water. Therefore, the condensed water can be more effectively dropped than when the injector is simply vibrated. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic configuration diagram of an internal combustion engine equipped with an injector vibration system according to a first embodiment. [Figure 2] 10 is a diagram showing the injector unit in a state in which the magnetic body portion is attracted to the electromagnet portion together with the injector main body; FIG. [Figure 3] 10 is a view showing the injector unit in a state where the magnetic material portion receives only the biasing force of the compression coil spring and is separated from the electromagnet portion together with the injector main body and abuts against the stopper. FIG. [Figure 4] 10 is a flowchart illustrating an example of a processing procedure of an "injector vibration processing." [Figure 5] 10 is a view showing the injector unit in a state in which the magnetic body, which is subjected to the biasing force of a compression coil spring, is pressed against the electromagnet together with the injector body. FIG. [Figure 6] 10 is a diagram showing the injector unit in a state where the magnetic body, which receives the repulsive force of the electromagnet, is separated from the electromagnet together with the injector main body. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] [Internal combustion engine equipped with an injector vibration system according to embodiment 1 (Fig. 1)] As shown in Fig. 1, an internal combustion engine 10 equipped with the injector vibration system 1 has a plurality of cylinders 8a to 8d, and injector units 3a to 3d including injector bodies (see Fig. 2) are provided for the cylinders 8a to 8d, respectively. Fuel is supplied to the injector bodies of the injector units 3a to 3d via a common rail 11 and fuel pipes 11a to 11d.

[0013] The control device 2 drives the injector main body by a control signal to inject fuel into each of the cylinders 8a to 8d, and also controls the energization of the injector units 3a to 3d (more specifically, the energization of the electromagnet portion 4c, see FIG. 2). The injector vibration system 1 thus includes the injector units 3a to 3d and the control device 2. The control device 2 according to this embodiment is a so-called ECU (Electronic Control Unit) to which a function for controlling the energization of the injector units 3a to 3d has been added, but a control device that controls only the energization of the injector units 3a to 3d may also be provided separately from the ECU.

[0014] The internal combustion engine 10 is provided with a rotation detection device 14. The rotation detection device 14 is, for example, a rotation sensor, and outputs a detection signal corresponding to the rotation angle of the crankshaft of the internal combustion engine 10 to the control device 2.

[0015] The battery 12 is electrically connected to the injector units 3a to 3d via the switch 13. The switch 13 switches whether or not a current flows from the battery 12 to the injector units 3a to 3d in response to a control signal from the control device 2.

[0016] The control device 2 includes a CPU 2a, a RAM 2d, a storage device 2e, a timer 2f, etc. The control device 2 (CPU 2a) receives detection signals from various detectors, including the rotation detector 14. The control device 2 (CPU 2a) outputs control signals to various actuators, including the switch 13. Note that the inputs and outputs of the control device 2 are not limited to the above-mentioned detectors and actuators. The control device 2 detects the operating state of the internal combustion engine 10 based on detection signals from various detectors, including the above-mentioned detectors, and controls various actuators, including the above-mentioned actuators. The storage device 2e is, for example, a flash-ROM or other storage device, and stores programs, data, etc. for controlling the internal combustion engine, performing self-diagnosis, etc. The control device 2 (CPU 2a) also includes an injector stationary unit 2b, an injector vibrating unit 2c, etc., the details of which will be described later.

[0017] [Configuration of the injector unit according to the first embodiment (Figs. 2 and 3)] Since the injector units 3a to 3d all have the same configuration, only the injector unit 3a will be described, and descriptions of the remaining injector units 3b to 3d will be omitted. Fig. 2 shows injector unit 3a in a state in which the magnetic material portion 5b is attracted to the electromagnet portion 4c together with the injector main body 5. Fig. 3 shows injector unit 3a in a state in which the magnetic material portion 5b is separated from the electromagnet portion 4c together with the injector main body 5 by the biasing force of the compression coil spring 6 alone and abuts against the stopper 4k.

[0018] As shown in FIG. 2, an internal combustion engine 10 has a cylinder block 8 and a cylinder head 9. The cylinder block 8 forms the cylindrical portion of the cylinder 8a and houses components of the so-called main moving system, such as the piston and crankshaft. The cylinder head 9 has a structure similar to that of a conventional cylinder head, except for the insertion hole 9a through which the injector unit 3a is inserted. For example, the cylinder head 9 has an intake port and an exhaust port formed toward the combustion chamber 8f. The cylinder head 9 also supports the so-called valve train, which is the intake and exhaust valves that open and close the openings of the intake and exhaust ports, and the mechanisms that open and close the intake and exhaust valves (such as a camshaft, lash adjuster, and rocker arm). The insertion hole 9a is larger than a conventional insertion hole through which only the injector body 5 is inserted.

[0019] The injector unit 3a has an injector body 5, a case portion 4 that partially accommodates the injector body 5, and a compression coil spring 6 (corresponding to an elastic member) that applies a biasing force to the injector body 5.

[0020] The case 4 is fixed at the insertion hole 9a and has a tubular portion 4a, a lid portion 4b, and an electromagnet portion 4c. The tubular portion 4a is made of a non-magnetic material and extends in the vertical direction at the insertion hole 9a. The tubular portion 4a has, for example, a cylindrical shape to fit the shape of the insertion hole 9a, but may also have a polygonal tubular shape (triangular tubular or rectangular tubular).

[0021] The lid portion 4b seals the upper part of the cylindrical portion 4a. The lid portion 4b is connected to a fuel pipe 11a extending from a common rail 11. The cylindrical portion 4a and the lid portion 4b may not be separate bodies, but may be integrally formed.

[0022] The electromagnet portion 4c is attached to the lower part of the cylindrical portion 4a, and a through-hole 4h is formed in the direction of the cylindrical portion axis L, which is the central axis of the cylindrical portion 4a. The electromagnet portion 4c is, for example, formed by housing a coil 4e in a yoke portion 4d, and the injector body 5 passes through the through-hole 4h. The electromagnet portion 4c generates magnetic poles when a current flows through the coil 4e. When the magnetic poles are generated, for example, the upper surface 4f of the electromagnet portion 4c becomes a north pole and the lower surface 4g becomes a south pole. In other words, when the switch 13 is turned on by a control signal from the control device 2, the electromagnet portion 4c generates magnetic poles due to the current flowing from the battery 12. On the other hand, when the switch 13 is turned off by a control signal from the control device 2, the current from the battery 12 stops flowing and the magnetic poles of the electromagnet portion 4c disappear.

[0023] The injector body 5 has a configuration similar to that of existing injectors, except for the magnetic material portion 5b, which is integrally formed. The injector body 5 is inserted into the through-hole 4h of the electromagnet portion 4c in the case portion 4 with both ends protruding. The lower end of the injector body 5, located outside the case portion 4, extends into the combustion chamber 8f. Meanwhile, the injector body 5 has a fuel inlet 5a at its upper end, located inside the case portion 4, through which fuel flows, and a magnetic material portion 5b attached to it, which faces the electromagnet portion 4c along the axis L of the cylindrical portion. When inserted into the through-hole 4h, the injector body 5 is slidable relative to the electromagnet portion 4c along the axis L of the cylindrical portion. There is a gap between the injector body 5 and the through-hole 4h of the electromagnet portion 4c, but this gap is sealed with a seal member 5e.

[0024] In the injector unit 3a, the case 4 is connected to a fuel pipe 11a of a common rail 11 via a lid 4b, and a gap between the injector body 5 and a through hole 4h of the electromagnet 4c is sealed with a seal member 5e. Therefore, the case 4 forms an enclosed space 4m filled with high-pressure fuel. The high-pressure fuel filled in the enclosed space 4m is supplied to the injector body 5 through a fuel inlet 5a.

[0025] The magnetic material portion 5b is integrally formed above the injector body 5 located inside the case 4. The magnetic material portion 5b extends radially from the injector body 5, for example, has a flange shape, and has an upper surface 5c and a lower surface 5d. The upper surface 5c of the magnetic material portion 5b is flush with the upper end of the injector body 5. The lower surface 5d of the magnetic material portion 5b faces the upper surface 4f of the electromagnet portion 4c. As shown in FIG. 2, the magnetic material portion 5b is attracted to the electromagnet portion 4c together with the injector body 5 due to the magnetic pole generated in the electromagnet portion 4c.

[0026] The compression coil spring 6 is expandable and contractible along the axis L of the cylindrical portion. The compression coil spring 6 is disposed around the injector body 5 so as to be compressible between the electromagnet portion 4c and the magnetic material portion 5b, and is interposed between the upper surface 4f of the electromagnet portion 4c and the lower surface 5d of the magnetic material portion 5b. The compression coil spring 6 always exerts an upward biasing force on the injector body 5 (magnetic material portion 5b) as it attempts to return to its natural length. Therefore, as shown in FIG. 3, when no magnetic pole is generated in the electromagnet portion 4c, the biasing force of the compression coil spring 6 moves the magnetic material portion 5b together with the injector body 5 away from the electromagnet portion 4c.

[0027] In the injector unit 3a, the case 4 has a stopper 4k on the lid 4b. As shown in FIG. 3, the stopper 4k is cylindrical and collides with the upper surface 5c of the magnetic material portion 5b and the upper end of the injector body 5, thereby stopping the injector body, which is moving under the biasing force of the compression coil spring 6. Returning to FIG. 2, the distance from the upper surface 5c of the magnetic material portion 5b, which is attracted by the electromagnet portion 4c, to the collision surface 4n of the stopper 4k is set to, for example, 1 mm. Note that, to protect the injector body 5, the stopper 4k may be cylindrical and collide only with the upper surface 5c of the magnetic material portion 5b.

[0028] The injector unit 3a is configured as described above, and by generating a magnetic pole in the electromagnet portion 4c, the magnetic material portion 5b is attracted to the electromagnet portion 4c together with the injector body 5. Alternatively, by not generating a magnetic pole in the electromagnet portion 4c, the injector unit 3a causes the magnetic material portion 5b together with the injector body 5 to move away from the electromagnet portion 4c and abut against the stopper 4k. That is, the control device 2 controls the current flowing from the battery 12 to the electromagnet portion 4c by switching the switch 13 on and off, thereby vibrating the injector body 5.

[0029] [Processing procedure of the control device 2 in the first embodiment (FIG. 4)] Next, the flow of processing by the control device 2 will be described with reference to the flowchart shown in FIG.

[0030] The control device 2 (CPU 2a) repeatedly starts the [injector vibration process] shown in FIG. 4 at predetermined time intervals (several [ms] to several tens [ms]), for example, and proceeds to step S110.

[0031] If the process proceeds to step S110, the control device 2 determines whether the internal combustion engine 10 is stopped or not based on the rotation status of the crankshaft of the internal combustion engine 10 acquired from the rotation detection device 14. If the internal combustion engine 10 is stopped (Yes), the control device 2 proceeds to step S120, and if the internal combustion engine 10 is not stopped (No), the control device 2 proceeds to step S115.

[0032] If the process proceeds to step S120, the control device 2 determines whether the standby timer is running. If the standby timer is running (Yes), the control device 2 proceeds to step S130, and if the standby timer is not running (No), the control device 2 proceeds to step S125.

[0033] If the process proceeds to step S125, the control device 2 initializes (resets to zero) and starts the standby timer, and then the process proceeds to step S130.

[0034] In step S130, the control device 2 acquires a preset waiting time from the storage device 2e, and proceeds to step S135.

[0035] If the process proceeds to step S135, the control device 2 determines whether the time measured by the standby timer is equal to or longer than the standby time. If the time measured by the standby timer is equal to or longer than the standby time (Yes), the control device 2 proceeds to step S140, and if not (No), the control device 2 proceeds to step S170A. The standby time is the time it takes for condensed water to adhere to the tip of the injector body 5, and is set to, for example, 10 minutes.

[0036] If the process proceeds to step S140, the control device 2 determines whether the vibration timer is running. If the vibration timer is running (Yes), the control device 2 proceeds to step S150, and if the vibration timer is not running (No), the control device 2 proceeds to step S145.

[0037] If the process proceeds to step S145, the control device 2 initializes (resets to zero) and starts the vibration timer, and then proceeds to step S150.

[0038] In step S150, the control device 2 acquires a preset vibration duration time from the storage device 2e, and proceeds to step S155.

[0039] If the process proceeds to step S155, the control device 2 determines whether the time measured by the vibration timer is equal to or shorter than the vibration duration. If the time measured by the vibration timer is equal to or shorter than the vibration duration (Yes), the control device 2 proceeds to step S160. If the time measured by the vibration timer is not equal to or shorter than the vibration duration (No), the control device 2 proceeds to step S170A. The vibration duration is preferably the time required for all condensed water adhering to the injector body 5 to be shaken off, and is set to, for example, one minute.

[0040] If the process proceeds to step S160, the control device 2 determines whether or not the electromagnet unit 4c is energized. If the electromagnet unit 4c is energized (Yes), the control device 2 proceeds to step S170A, and if the electromagnet unit 4c is not energized (No), the control device 2 proceeds to step S170B. Even if the process proceeds from step S115 to step S115, the control device 2 stops the wait timer and vibration timer, and proceeds to step S170B.

[0041] If the process proceeds to step S170A, the control device 2 de-energizes the electromagnet portion 4c and ends the process shown in Fig. 4. If the process proceeds to step S170B, the control device 2 energizes the electromagnet portion 4c and ends the process shown in Fig. 4. In this way, particularly when the time measured by the vibration timer is equal to or less than the vibration duration (step S155, Yes), steps S170A and S170B are repeated alternately, and the injector body 5 vibrates at predetermined time intervals (several [ms] to several tens [ms]).

[0042] The control device 2 (CPU 2a) executing the processing of steps S135 to S170B corresponds to the injector vibration unit 2c (see FIG. 1) that, when the internal combustion engine 10 that was in an operating state is stopped, controls the energization of the electromagnet unit 4c to vibrate the injector body 5 along the direction of the cylindrical portion axis L at least once after a predetermined period has elapsed since the internal combustion engine 10 was stopped. The control device 2 (CPU 2a) executing the processing of step S170B corresponds to the injector stationary unit 2b (see FIG. 1) that, when the internal combustion engine 10 is in an operating state, controls the energization of the electromagnet unit 4c so that the injector body 5, which is slidable in the direction of the cylindrical portion axis L, is stationary in a downwardly moved state.

[0043] [Configuration of the injector unit according to the second embodiment (FIGS. 5 and 6)] The second embodiment will be described with reference to Figures 5 and 6. The injector unit 23a according to the second embodiment is formed in substantially the same manner as the first embodiment. As in the first embodiment, the injector unit 23a is inserted into an insertion hole 9a formed in the cylinder head 9. Therefore, Figures 5 and 6 show only the configuration of the injector unit 23a, and omit other components. Figure 5 shows the injector unit in a state in which the magnetic material portion 25b, which receives only the biasing force of the compression coil spring 6, is pressed against the electromagnet portion 4c together with the injector main body 25. Figure 6 shows the injector unit in a state in which the magnetic material portion 25b, which receives the repulsive force of the electromagnet portion 4c, is separated from the electromagnet portion 4c together with the injector main body 25.

[0044] As shown in FIG. 5, the injector unit 23a has an injector body 25, a case portion 24 that partially accommodates the injector body 25, and a compression coil spring 6 that applies a biasing force to the injector body 25.

[0045] The case 24 has a lid 24b instead of the lid 4b of the embodiment 1. The lid 24b has a guide portion 24k that houses and guides a part of the compression coil spring 6.

[0046] The injector body 25 has substantially the same configuration as the injector body 5 of the first embodiment, except that the magnetic body 25b is integrally provided. The magnetic body 25b is, for example, a permanent magnet with an upper surface 5c having an S pole and a lower surface 5d having an N pole. Therefore, when the electromagnet 4c generates magnetic poles such that the upper surface 4f has an N pole and the lower surface 4g has an S pole, the lower surface 5d (N pole) of the magnetic body 25b and the upper surface 4f (N pole) of the electromagnet 4c repel each other. As a result, the compression coil spring 6 is compressed along the guide portion 24k (see FIG. 6). The repulsive force between the electromagnet 4c and the magnetic body 25b (permanent magnet) is set so that the compression coil spring 6 is compressed by, for example, 1 mm.

[0047] The injector vibration system of the present invention is not limited to the appearance, configuration, structure, etc. described in this embodiment, and various changes, additions, and deletions are possible within the scope of the gist of the present invention. Furthermore, the numerical values used in the description of this embodiment are merely examples, and the present invention is not limited to these numerical values. For example, in the first embodiment, the standby time is set to 10 minutes, and the vibration duration is set to 5 minutes, but appropriate times determined by experiments or the like for each vehicle can be set.

[0048] In addition, in embodiment 1, after the waiting time has elapsed, the electromagnet portion 4c is repeatedly energized and de-energized for the duration of the vibration, but it may also be configured to repeatedly energize and de-energize the electromagnet portion 4c a predetermined number of times.

[0049] In the first embodiment, the case 4 has the stopper 4k on the cover 4b. However, the stopper 4k may be provided on the cylindrical portion 4a as long as it collides with the upper surface 5c of the magnetic material portion 5b.

[0050] In the first embodiment, the upper surface 5c of the magnetic material portion 5b is flush with the upper end of the injector main body 5. However, the magnetic material portion 5b may be provided above the injector main body 5 located inside the case 4. For example, the upper end of the injector main body 5 may protrude from the upper surface 5c of the magnetic material portion 5b. In this case, in order to protect the injector main body 5, it is desirable that the stopper 4k be cylindrical and collide only with the upper surface 5c of the magnetic material portion 5b. [Explanation of symbols]

[0051] 1 Injector vibration system 2. Control device 2a CPU 2b Injector stationary part 2c Injector vibration part 2d RAM 2e storage device 2f timer 3a~3d, 23a Injector unit 4, 24 Case part 4a Cylindrical part 4b, 24b Lid 4c Electromagnet part 4d Yoke 4e coil 4f top surface 4g bottom 4h through hole 4k stopper 4m closed space 4n collision surface 5, 25 Injector body 5a Fuel inlet 5b, 25b Magnetic body part 5c Top 5d bottom side 5e Sealing material 6 compression coil springs 8 Cylinder block 8a cylinder 8f Combustion chamber 9. Cylinder head 9a Insertion hole 10 Internal combustion engine 11 Common rail 11a~11d Fuel piping 12 Battery 13 Switch 14 Rotation detection device 24k guide part L Cylindrical part axis

Claims

1. An injector vibration system that vibrates an injector that injects fuel into a combustion chamber of an internal combustion engine, an injector unit inserted into a through-hole formed in the cylinder head and extending in the vertical direction so as to communicate with the combustion chamber; a control device that controls the supply of electricity to the injector unit; and The injector unit includes: the injector, a case that houses a portion of the injector, and an elastic member that applies a biasing force to the injector, the case portion includes a non-magnetic cylindrical portion extending vertically along the insertion hole, a lid portion sealing an upper portion of the cylindrical portion, and an electromagnet portion attached to a lower portion of the cylindrical portion, The electromagnet portion has a through hole formed in the axial direction of the cylindrical portion, which is the central axis of the cylindrical portion, The injector is inserted into the through hole with a gap between the injector and the through hole sealed with a seal member, and is slidable relative to the electromagnet portion along the axial direction of the cylindrical portion. The injector has an upper side located within the case portion, and is provided with a fuel inlet through which fuel flows in, and a magnetic portion facing the electromagnet portion in the axial direction of the cylindrical portion, and a lower end portion of the injector protrudes downward beyond the electromagnet portion. the elastic member is provided between the magnetic material portion and the lid portion of the cylindrical portion, or between the magnetic material portion and the electromagnet portion, and is expandable and contractible along the axial direction of the cylindrical portion, the fuel filled in the case portion flows into the fuel inlet of the injector from a fuel pipe connected to the lid portion or the cylindrical portion, The control device an injector stationary portion that controls energization of the electromagnet portion so that the injector, which is slidable in the axial direction of the cylindrical portion, is stationary in a downward position when the internal combustion engine is in operation; an injector vibration unit that, when the internal combustion engine that was in an operating state is stopped, controls energization of the electromagnet unit to vibrate the injector along the axial direction of the cylindrical portion at least once after a predetermined period has elapsed since the internal combustion engine was stopped; having Injector vibration system.

2. 2. The injector vibration system of claim 1, the elastic member is a compression coil spring having an inner diameter larger than an outer diameter of the injector, and is disposed between the magnetic material portion and the electromagnet portion with the injector passing through its center, the case portion has a stopper on either the cylindrical portion or the lid portion, When the compression coil spring returns from a compressed state to its natural length, the injector provided with the magnetic material portion, which moves in the axial direction of the cylindrical portion, collides with the stopper and stops; The control device the injector stationary portion maintains the energization of the electromagnet portion when the internal combustion engine is in an operating state, so that the magnetic material portion is attracted to the electromagnet portion, and the compression coil spring is compressed to hold the injector stationary; when the internal combustion engine that was in operation is stopped by the injector vibration unit, after a predetermined period of time has elapsed since the engine was stopped, energizing and deenergizing the electromagnet unit at least once to vibrate the injector along the axial direction of the cylindrical portion; Injector vibration system.

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