JP2010190178A - Fuel injection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection apparatus having an injector with a solenoid device as an actuator, in which injection characteristics can be stably changed. <P>SOLUTION: The solenoid device of the injector has an irregular pitch coil spring as an energizing means 28 that energizes a control valve body for opening and closing a control chamber toward an opposite side of a lift direction. The energizing means 28 has spring characteristics such that, if an amount of deflection thereof due to compressive load is increased more than a boundary value, a spring coefficient thereof is also increased. Further, an ECU varies the maximum amount of current at an initial current feed according to the load of an engine. With this configuration, if the control valve body moves to pass through from a balanced position toward one side owing to its inertia, force of the spring abruptly grows strong. This prevents the control valve body from passing through too far and also attenuates vibration quickly. As a result, the fuel injection system can stably change injection characteristics. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel injection device that injects and supplies fuel to an engine.

  2. Description of the Related Art Conventionally, a fuel injection device includes an injector that injects fuel by opening a valve, an electronic control device (hereinafter referred to as an ECU) as control means for controlling the opening of the injector, and the like. Further, it is widely known that an injector includes a solenoid device as an actuator and opens a valve by using a suction force generated by energizing a solenoid coil, and an ECU of a fuel injection device including such an injector includes: The valve opening of the injector is controlled by controlling energization to the solenoid coil.

  For example, as shown in FIG. 5, the conventional injector 100 includes an injection valve body 102 that opens and closes an injection hole 101 and a solenoid device 104 that generates a suction force, and in a valve closing direction with respect to the injection valve body 102. A control chamber 105 for applying fuel pressure, an inflow channel 106 for allowing fuel to flow into the control chamber 105, and an outflow channel 107 for allowing fuel to flow out from the control chamber 105 are formed.

  The solenoid device 104 includes a solenoid coil 110 that generates a suction force when energized, an armature 111 that moves to one side upon receiving the suction force, a coil spring that serves as a biasing unit 112 that biases the armature 111 to the other side, and an armature 111. A control valve body 113 that opens and closes the control chamber 105 with respect to the outflow passage 107 and a stopper 114 that restricts the movement of the armature 111 by the suction force.

  Then, the armature 111 and the control valve element 113 move to one side when the energization of the solenoid coil 110 is started, thereby opening the control chamber 105 to the outflow passage 107. As a result, the fuel pressure in the control chamber 105 decreases, so that the injection valve body 102 is driven in the valve opening direction to open the injection hole 101. Further, the armature 111 and the control valve body 113 move to the other side by stopping energization of the solenoid coil 110, thereby closing the control chamber 105 with respect to the outflow passage 107. As a result, the fuel pressure in the control chamber 105 increases, and the injection valve body 102 is driven in the valve closing direction to close the injection hole 101.

  Further, the ECU calculates command values for energization start timing and energization period for the solenoid coil 110, and outputs a control signal corresponding to these command values, thereby controlling the energization to the solenoid coil 110 and the injector. 100 valve opening is controlled.

  In recent years, the injector 100 is required to have various injection characteristics according to the engine load (see FIG. 6). For example, in a low load region such as idling, it is possible to suppress an excessive injection amount by reducing the initial injection rate gradient by slowing the valve opening operation of the injection valve body 102 as in Pattern 1, resulting in a higher value. Accurate control is possible. On the other hand, in a high load region, it is preferable to inject a large amount of fuel in as short a time as possible from the viewpoint of improving combustion efficiency and exhaust gas purification. Therefore, it is advantageous to increase the initial injection rate gradient.

Incidentally, the valve opening operation of the injection valve body 102 depends on the lift amount from the seating position of the control valve body 113.
Here, the control valve body 113 before energization to the solenoid coil 110 is seated at a predetermined seating position by a biasing force (hereinafter referred to as a spring force) of a coil spring as the biasing means 112, thereby controlling the control chamber 105. Is closed with respect to the outflow channel 107. When energization of the solenoid coil 110 is started and the attractive force is increased as the energization amount is increased and becomes stronger than the spring force, the control valve body 113 is lifted away from the seating position.

  If the lift amount of the control valve element 113 is small, the effective outflow area from the control chamber 105 is also small, so the outflow rate is small and the rate of decrease in the fuel pressure in the control chamber 105 is small. As a result, the valve opening operation of the injection valve body 102 becomes gentle. Further, if the lift amount of the control valve body 113 is large, the effective outflow area from the control chamber 105 is also large, so that the outflow flow rate increases and the rate of decrease in the fuel pressure in the control chamber 105 increases. As a result, the valve opening operation of the injection valve body 102 becomes quick.

In view of this, means for operating the suction force by varying the energization amount of the solenoid coil 110 has been studied in order to vary the lift amount of the control valve element 113 in accordance with the engine load.
However, when trying to vary the lift amount of the control valve body 113, the control valve body 113 may vibrate and the lift amount becomes unstable and the injection characteristics may become unstable. That is, when the lift amount is not variable, the energization amount is set so that the suction force is much larger than the urging force, and the armature 111 moved to one side by the suction force is brought into contact with the stopper 114. Therefore, it is difficult for the control valve body 113 to vibrate.

  On the other hand, when the lift amount of the control valve element 113 is to be varied, the lift amount depends on a balance of various forces such as a spring force and a suction force acting on the armature 111. That is, when trying to reduce the lift amount, it is necessary to stop the armature 111 before coming into contact with the stopper 114. The suction force is lowered so that the spring force, suction force, etc. (In the following description, the position where the armature 111 is not in contact with the stopper 114 and the position where the spring force, the suction force, etc. are balanced is called the balanced position).

  As a result, the armature 111 and the control valve body 113 vibrate excessively from the balance position to one side due to inertia, and the lift amount becomes unstable and the injection characteristics may become unstable.

  Patent Document 1 discloses an injector that includes a three-way valve as a control valve body and opens and closes a control chamber with respect to an outflow passage according to a seating position of the three-way valve. And the injector of patent document 1 also has the same problem when it is going to change an injection characteristic.

JP 2004-251205 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to make it possible to stably vary the injection characteristics in a fuel injection device including an injector having a solenoid device as an actuator. is there.

[Means of Claim 1]
The fuel injection device according to claim 1, which injects and supplies fuel to the engine, controls an injector that opens using a suction force generated by energization of the solenoid coil, and energization of the solenoid coil. And a control means for controlling the valve opening of the injector. The injector has a movable body that moves to one side by a suction force, and a biasing means that biases the movable body to the other side, and energization of the solenoid coil is started and the suction force is applied to the biasing means. When the force becomes stronger than the urging force, the movable body starts moving to one side to open the valve.

  The biasing means has a spring characteristic that the spring constant increases as the deflection amount due to the compressive load increases. The control means sets the maximum energization amount for the initial energization for starting the movement of the movable body to one side, and increases the energization amount to the maximum energization amount so that the suction force is stronger than the urging force. The maximum energization amount is varied according to the engine load.

  As a result, when a movable body such as an armature or a control valve body tries to go too far from the balance position to one side due to inertia, the urging force of the urging means is rapidly increased. That is, if the movable body tries to go too far to the one side, the amount of deflection of the biasing means increases and the spring constant increases, so the biasing force of the biasing means is rapidly strengthened. For this reason, even if the movable body tries to vibrate excessively to one side due to inertia, the overrun is suppressed and the vibration is attenuated early.

As a result, the armature and the control valve body as the movable body can be stably stopped at an early stage without vibrating at the balanced position.
As described above, since the lift amount of the movable body can be stably changed to a value smaller than the value determined by the armature contacting the stopper, the fuel injection device including the injector using the solenoid device as the actuator can stably inject fuel. The characteristics can be varied.

[Means of claim 2]
According to the fuel injection device of the second aspect, the injector includes the injection valve body that opens and closes the injection hole, and the control chamber and the control chamber for applying the fuel pressure to the injection valve body in the valve closing direction. An inflow channel for allowing the fuel to flow in and an outflow channel for allowing the fuel to flow out from the control chamber are formed.

In addition, the movable body moves to one side by starting energization to the solenoid coil to open the control chamber to the outflow passage, and moves to the other side by stopping energization to the solenoid coil to flow out from the control chamber. Close to the flow path. Further, the injection valve body is driven in the valve opening direction by opening the control chamber with respect to the outflow passage, and is driven in the valve closing direction by closing the control chamber with respect to the outflow passage.
This means shows one aspect of the injector that exhibits the function and effect of the means of claim 1.

(A) is a block diagram of a fuel-injection apparatus, (b) is a time chart which shows the electricity supply pattern to a solenoid coil (Example). It is a block diagram of an injector (Example). (A) is a block diagram of the urging means, (b) is a characteristic diagram showing the spring characteristics of an unequal pitch coil spring as the urging means, and (c) is an initial energization pattern in the energization pattern to the solenoid coil. It is a time chart which shows the variable situation of the maximum energization amount (Example). It is a block diagram of a biasing means (modification example). It is a block diagram of an injector (conventional example). It is a time chart which shows an injection characteristic (conventional example).

  The fuel injection device supplies fuel by injecting fuel to the engine. The injector opens using the suction force generated by energizing the solenoid coil, and the injector opens by controlling energization to the solenoid coil. And control means for controlling. The injector has a movable body that moves to one side by a suction force, and a biasing means that biases the movable body to the other side, and energization of the solenoid coil is started and the suction force is applied to the biasing means. When the force becomes stronger than the urging force, the movable body starts moving to one side to open the valve.

  The biasing means has a spring characteristic that the spring constant increases as the deflection amount due to the compressive load increases. The control means sets the maximum energization amount for the initial energization for starting the movement of the movable body to one side, and increases the energization amount to the maximum energization amount so that the suction force is stronger than the urging force. The maximum energization amount is varied according to the engine load.

  The injector includes an injection valve body that opens and closes the injection hole, a control chamber for applying fuel pressure to the injection valve body in a valve closing direction, an inflow passage for allowing fuel to flow into the control chamber, and An outflow passage is formed for allowing fuel to flow out of the control chamber.

  The movable body moves to one side by starting energization to the solenoid coil to open the control chamber to the outflow passage, and moves to the other side by stopping energization to the solenoid coil to flow out of the control chamber. Close to the flow path. Further, the injection valve body is driven in the valve opening direction by opening the control chamber with respect to the outflow passage, and is driven in the valve closing direction by closing the control chamber with respect to the outflow passage.

[Configuration of Example]
The configuration of the fuel injection device 1 according to the embodiment will be described with reference to the drawings.
The fuel injection device 1 injects and supplies fuel to an engine (not shown). For example, as shown in FIG. 1A, the fuel injection device 1 includes a common rail 2 and a fuel tank 3 that accumulate fuel in a high pressure state. A supply pump 4 that sucks fuel into a high pressure and supplies it to the common rail 2, an injector 5 that is attached to each cylinder of the engine, receives fuel from the common rail 2, and injects fuel into the cylinder, the supply pump 4 and the injector 5 An electronic control unit (hereinafter referred to as ECU 6) for controlling the operation of

  For example, as shown in FIG. 2, the injector 5 includes an injection valve body 10 that opens and closes an injection hole 9 by opening and closing a valve, and a command piston that contacts the injection valve body 10 and moves integrally with the injection valve body 10. 11. A coil spring 12 that urges the injection valve body 10 in the valve closing direction, a solenoid device 13 as an actuator that causes the injection valve body 10 to open the valve, and the like. The injector 5 also has a control chamber 15 for applying fuel pressure to the injection valve body 10 in the valve closing direction, an inflow channel 16 for allowing fuel to flow into the control chamber 15, and fuel from the control chamber 15. An outflow channel 17 is formed for outflow.

  Here, the inflow and outflow passages 16 and 17 are respectively provided with an inflow side restrictor 18 that restricts the inflow of fuel into the control chamber 15 and an outflow side restrictor 19 that restricts the outflow of fuel from the control chamber 15. ing. In addition, the outflow side restrictor 19 is provided so that the fuel passage resistance is smaller than that of the inflow side restrictor 18.

  The injection valve body 10 is slidably supported by the valve body 22 and moves in the valve opening direction or the valve closing direction. In addition, the injection valve body 10 forms a nozzle chamber 23 in which high-pressure fuel received from the common rail 2 is accumulated, and opens and closes the nozzle hole 9 with respect to the nozzle chamber 23. The fuel pressure in the nozzle chamber 23 acts on the injection valve body 10 in the valve opening direction.

The command piston 11 is slidably supported by the valve body 22 and seals the control chamber 15. As a result, the volume of the control chamber 15 is varied according to the movement of the command piston 11, and the fuel pressure in the control chamber 15 acts on the injection valve body 10 via the command piston 11.
The fuel leaking from the control chamber 15 and the nozzle chamber 23 through the sliding gap flows into the spring chamber 24 that houses the coil spring 12. The fuel that has flowed into the spring chamber 24 is returned to the fuel tank 3 together with the fuel accompanying the dynamic leak that has flowed out of the control chamber 15 via the outflow passage 17.

  The solenoid device 13 includes a solenoid coil 26 that generates an attractive force when energized, an armature 27 that moves to one side upon receiving the attractive force, a coil spring as an urging means 28 that urges the armature 27 to the other side, A control valve body 29 that is held at the end and opens and closes the control chamber 15 with respect to the outflow passage 17, a stopper 30 that restricts the movement of the armature 27 by the suction force, and the like.

  With the above configuration, when energization of the solenoid coil 26 is started and a suction force is generated, the armature 27 and the control valve element 29 are displaced to one side, and the control chamber 15 is opened to the outflow passage 17. Here, since the outflow side restrictor 19 allows fuel to pass through more easily than the inflow side restrictor 18, when the control chamber 15 is opened to the outflow passage 17, the fuel from the inflow passage 16 to the control chamber 15. The amount of fuel flowing out from the control chamber 15 to the outflow passage 17 becomes larger than the amount of flowing in, and the fuel pressure in the control chamber 15 decreases. For this reason, the resultant force acting on the injection valve body 10 becomes stronger in the valve opening direction, the injection valve body 10 is driven in the valve opening direction to open the injection hole 9, and fuel injection is started.

  Here, the control valve element 29 before the start of energization of the solenoid coil 26 is seated at a predetermined seating position by a biasing force (hereinafter referred to as a spring force) of a coil spring as the biasing means 28, thereby controlling the control chamber 15. Is closed with respect to the outflow channel 17. When energization of the solenoid coil 26 is started and the attraction force is increased as the energization amount increases and becomes stronger than the spring force, the control valve element 29 is lifted away from the seating position.

  Eventually, when the energization of the solenoid coil 26 is stopped and the attractive force disappears, the armature 27 and the control valve element 29 are biased by the spring force and displaced to the other side. Then, the control valve body 29 is seated at the seating position, whereby the control chamber 15 is closed with respect to the outflow channel 17. As a result, the outflow of fuel from the control chamber 15 to the outflow passage 17 stops, and the fuel pressure in the control chamber 15 rises due to the inflow of fuel from the inflow passage 16 to the control chamber 15. For this reason, the resultant force acting on the injection valve body 10 becomes stronger in the valve closing direction, the injection valve body 10 is driven in the valve closing direction to close the injection hole 9, and fuel injection is stopped.

  As shown in FIG. 1A, the ECU 6 includes a microcomputer 33 that outputs a control signal for controlling the valve opening of the injector 5, a drive circuit 34 that receives power from the control signal and supplies power to the solenoid device 13. Have The microcomputer 33 has a well-known structure having a storage device such as a CPU, ROM, and RAM, an input device, an output device, and the like having a control function and an arithmetic function.

  The microcomputer 33 receives detection signals from various sensors such as a rail pressure sensor 35 that detects the fuel pressure in the common rail 2, and starts energization and energization period to the solenoid coil 26 based on these detection signals. Command values are calculated for these, and control signals corresponding to these command values are output to the drive circuit 34.

  Further, the drive circuit 34 has a high voltage generation circuit 36 for generating a suction force that lifts the control valve body 29 away from the seating position. Here, when energization of the solenoid coil 26 is started, a strong suction force is required to lift the control valve element 29 away from the seating position against the spring force.

Therefore, as shown in FIG. 1B, at the start of energization, a high voltage is applied to the solenoid coil 26 from the high voltage generation circuit 36, the energization amount is greatly increased, and the attraction force is enhanced (hereinafter referred to as “the energization force”) In this description, energization performed by applying a high voltage to the solenoid coil 26 to separate and lift the control valve body 29 is referred to as initial energization).
As described above, the ECU 6 controls the opening of the injector 5 by controlling the energization of the solenoid coil 26.

[Features of Examples]
The features of the fuel injection device 1 according to the embodiment will be described with reference to the drawings.
According to the fuel injection device 1 of the embodiment, as shown in FIG. 3, the biasing means 28 included in the solenoid device 13 of the injector 5 is an unequal pitch coil spring having a non-uniform pitch, and a sparse part 38 having a large pitch. And a dense portion 39 having a smaller pitch than the sparse portion 38. As a result, when the amount of deflection exceeds a predetermined boundary value due to the increase of the compressive load applied to the urging means 28, the effective number of windings acting as a spring decreases and the spring constant (compressive load / deflection amount) increases.

  That is, the urging means 28 has a non-linear spring characteristic in which the spring constant increases as the deflection amount due to the compressive load increases. According to the spring characteristics of the biasing means 28, the spring constant increases when the amount of deflection due to the compressive load exceeds the boundary value. For this reason, the correlation between the spring force acting on the armature 27 and the control valve element 29 as a reaction force of the compression load and the lift amount of the control valve element 29 corresponding to the deflection amount is also nonlinear. As a result, when the lift amount exceeds a threshold value corresponding to the boundary value, the rate of increase of the spring force with respect to the lift amount increases, and the control valve element 29 is unlikely to lift rapidly.

  Further, the ECU 6 sets the maximum energization amount for the initial energization, and increases the energization amount to the maximum energization amount so that the attraction force is stronger than the spring force, thereby enhancing the attraction force. Thereby, the control valve body 29 can continue to be reliably lifted even after being separated from the seating position. Then, the ECU 6 varies the set value of the maximum energization amount according to the engine load, and outputs a control signal to the drive circuit 34 so that a voltage corresponding to the set value can be applied to the solenoid coil 26.

  For example, when the engine load is large, the ECU 6 increases the set value of the maximum energization amount to increase the maximum value of the suction force. Thereby, the control valve element 29 is lifted until the armature 27 comes into contact with the stopper 30, so that the lift amount is large and the effective outflow area from the control chamber 15 is also large. For this reason, since the flow rate of the fuel flowing out from the control chamber 15 is increased, the rate of decrease in the fuel pressure in the control chamber 15 is increased, and the valve opening operation of the injection valve element 10 is accelerated.

  Further, the ECU 6 reduces the maximum value of the suction force by lowering the set value of the maximum energization amount when the engine load is small as in the idling operation. As a result, the control valve body 29 stops the lift at the balance position where the spring force, the suction force and the like balance before the armature 27 contacts the stopper 30, so that the lift amount is small and the effective outflow area from the control chamber 15 is also small. . For this reason, the outflow flow rate of the fuel from the control chamber 15 becomes small, the rate of decrease in the fuel pressure in the control chamber 15 becomes small, and the valve opening operation of the injection valve body 10 becomes gentle.

[Effects of Examples]
According to the fuel injection device 1 of the embodiment, the solenoid device 13 of the injector 5 lifts the control valve body 29 by lifting the control valve body 29 by lifting from the seating position by the suction force of the solenoid coil 26 and opening the control chamber 15. There is a biasing means 28 biasing in the direction opposite to the direction. When the energization of the solenoid coil 26 is started and the suction force becomes stronger than the spring force, the injector 5 opens when the control valve body 29 is lifted away from the seating position.

  The biasing means 28 has a spring characteristic such that the spring constant increases as the deflection amount due to the compressive load increases beyond the boundary value. Further, the ECU 6 sets the maximum energization amount for the initial energization for separating and lifting the control valve body 29, and increases the energization amount to the maximum energization amount so that the suction force becomes stronger than the spring force. . The ECU 6 varies the maximum energization amount according to the engine load.

  Thereby, when it is desired to stop the control valve element 29 in a state where the effective outflow area from the control chamber 15 is small based on the small load of the engine, the control valve element 29 can be stably stopped.

  That is, the biasing means 28 and the maximum energization amount are set so that the deflection amount of the biasing means 28 exceeds the boundary value at a balance position where the effective outflow area corresponding to the engine load is obtained. As a result, when the armature 27 and the control valve body 29 are going to go too far from the balanced position to the one side due to inertia, the spring force suddenly increases.

  In other words, if the armature 27 and the control valve element 29 try to go too far beyond the balanced position, the amount of deflection of the urging means 28 becomes larger than the boundary value and the spring constant increases, so the spring force is rapidly strengthened. Is done. For this reason, even if the armature 27 and the control valve element 29 try to vibrate excessively to one side due to inertia, the overshoot is suppressed and the vibration is attenuated early.

As a result, the armature 27 and the control valve element 29 can be stably stopped early without vibrating at the balanced position.
As described above, the lift amount of the control valve body 29 can be stably changed to a numerical value smaller than the numerical value determined by the armature 27 coming into contact with the stopper 30. Therefore, the fuel injection device including the injector 5 using the solenoid device 13 as an actuator. 1, the injection characteristic can be varied stably.

[Modification]
According to the injector 5 of the embodiment, the biasing means 28 of the solenoid device 13 is an unequal pitch coil spring having one sparse part 38 and one dense part 39, and the spring characteristic has one boundary value. However, an unequal pitch coil spring having two or more boundary values of spring characteristics may be adopted as the biasing means 28. That is, an unequal pitch coil spring having three or more portions having different pitches may be adopted as the biasing means 28. In this case, since a plurality of balance positions can be set for each boundary value, the injection characteristics can be varied more finely.

  Further, according to the injector 5 of the embodiment, the urging means 28 is an unequal pitch coil spring in which the sparse portion 38 and the dense portion 39 are provided in series, but a plurality of coil springs having different lengths in the expansion / contraction direction. The urging means 28 may be configured by arranging them in parallel.

  For example, as shown in FIG. 4, when the biasing means 28 is configured by two long and short coil springs 41 and 42 to bias the armature 27, the longer coil spring 41 is lifted by the attraction force. Until the arm spring 27 abuts against the shorter coil spring 42. Eventually, when the armature 27 comes into contact with the coil spring 42, both the coil springs 41, 42 exert a spring force on the armature 27, and the spring force increases rapidly. For this reason, the spring characteristic of the biasing means 28 is non-linear as in the embodiment, and the same effect as in the embodiment can be obtained.

  Further, the injector 5 of the embodiment forms a control chamber 15 for applying fuel pressure to the injection valve body 10 in the valve closing direction, and opens and closes the control chamber 15 with respect to the outflow passage 17. 29 is held at the other end of the armature 27, but the aspect of the injector 5 to which the present invention can be applied is not limited to this.

  For example, an injector that does not form the control chamber 15 and that directly drives the injection valve body 10 with suction force may be used in a balanced position where the suction force and spring force acting on the injection valve body 10 are balanced. The present invention may be applied in order to stop stably.

  Further, the configuration of the fuel injection device 1 is not limited to the embodiment. For example, the common rail 2 may not be provided, and fuel may be directly supplied from the supply pump 4 to the injector 5 for injection. The injector 5 may be arranged in the intake pipe instead of in the cylinder, and the fuel may be injected and supplied into the intake pipe.

DESCRIPTION OF SYMBOLS 1 Fuel injection apparatus 5 Injector 6 ECU (control means)
DESCRIPTION OF SYMBOLS 9 Injection hole 10 Injection valve body 15 Control chamber 16 Inflow flow path 17 Outflow flow path 26 Solenoid coil 27 Armature (movable body)
28 Biasing means 29 Control valve body (movable body)

Claims (2)

In a fuel injection device for injecting and supplying fuel to an engine,
An injector that opens using the attractive force generated by energizing the solenoid coil;
Control means for controlling energization to the solenoid coil to control valve opening of the injector,
The injector is
A movable body that moves to one side by the suction force, and a biasing means that biases the movable body to the other side;
When energization to the solenoid coil is started and the attraction force becomes stronger than the urging force of the urging means, the movable body starts moving to one side and opens,
The biasing means has a spring characteristic such that the greater the amount of deflection due to the compressive load, the greater the spring constant,
The control means includes
The maximum energization amount is set with respect to initial energization for causing the movable body to start moving to one side, and the energization amount is increased to the maximum energization amount so that the suction force is stronger than the urging force,
The fuel injection device characterized in that the maximum energization amount is varied according to the load of the engine. The fuel injection device according to claim 1,
The injector includes an injection valve body that opens and closes an injection hole, a control chamber for applying fuel pressure to the injection valve body in a valve closing direction, an inflow channel for allowing fuel to flow into the control chamber, And forming an outflow passage for allowing fuel to flow out of the control chamber,
The movable body moves to one side by starting energization to the solenoid coil to open the control chamber to the outflow passage, and moves to the other side by stopping energization to the solenoid coil. Closing the control chamber against the outflow channel;
The fuel injection device, wherein the injection valve body is driven in a valve opening direction by opening the control chamber with respect to the outflow passage, and is driven in a valve closing direction by closing the control chamber with respect to the outflow passage. .

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