JPH0631580B2 - Fuel injection valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fuel injection valve in which fuel injection is controlled by an electrostrictive actuator.

[Conventional technology]

As the time required for opening and closing the fuel injection valve decreases,
That is, the faster the opening / closing response, the higher the control accuracy and the better the performance of the internal combustion engine. There is an electrostrictive actuator as a fast response actuator, and recently, some fuel injection valves using this electrostrictive actuator have been proposed.

The present inventors have filed Japanese Patent Application No. 58-3637 (Japanese Patent Application Laid-Open No. 59-2).
In the fuel injection valve proposed in Japanese Laid-Open Patent Publication No. 06668), when the electrostrictive actuator is extended, it is energized by the fuel pressure in the pump chamber that rises, the nozzle needle blocks the injection port, and conversely the electrostrictive actuator contracts. The nozzle needle is configured to open the injection port by being urged by the fuel pressure that acts on the fuel pool during the operation. That is, the fuel in the fuel pool pushes up the nozzle needle by its own pressure and is ejected from the ejection port.

[Problems to be solved by the invention]

In the above conventional device, since the injected fuel acts to open the nozzle needle at the same time, when the injection pressure is low, the control response of the nozzle needle is poor,
Further, when the pressure of the injected fuel suddenly changes, the nozzle needle may vibrate accordingly. Due to such a decrease in responsiveness and vibration of the nozzle needle, desired fuel may not be produced depending on the usage conditions of the fuel injection valve, which is a problem.

In view of the above-mentioned problems of the prior art, the present invention provides a fuel injection valve using an electrostrictive actuator that can stably drive a valve body even if the injected fuel has a pressure fluctuation. It was made for the purpose of providing.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is provided with a nozzle body having a valve seat formed therein and reciprocally movable with respect to the nozzle body, and is connected to and separated from the valve seat to intermittently inject fuel from an injection hole. The valve body, the fuel pool for injection that supplies fuel upstream of the valve seat, and the fuel pool for injection are formed by being partitioned, and the fuel pressure supplied thereto is adjusted in the valve opening direction of the valve body. A control oil reservoir to be actuated, and a substantially closed chamber-like pump chamber formed facing the end surface of the valve body opposite to the valve seat, and the volume of the pump chamber is changed by expansion and contraction, An electrostrictive actuator for moving a body toward and away from the valve seat; and a first pressure-supplying fuel for supplying fuel to the fuel pool for injection.
Second fuel supply system, which is a system separate from the first fuel supply system and supplies a fuel having a constant pressure relatively higher than that of the fuel in the injection fuel pool to the control fuel pool. A technical means called a fuel injection valve, which has a supply system, is adopted.

[Action]

In the fuel injection valve of the present invention, the first fuel supply system that supplies fuel to the upstream side of the valve seat and the fuel having a higher pressure than the first fuel supply system in the control oil reservoir that urges the valve body Since the second fuel control system for supplying the fuel is independently provided as a separate system, the pressure of the fuel supplied to the control oil sump is supplied to the upstream side of the valve seat when the fuel injection valve opens. Even if the fuel is discharged, it is not affected by the pressure fluctuation. Therefore, the force acting on the valve body due to the pressure of the fuel in the control oil sump is always constant during the operation of the system, and the force causes the valve body to accurately respond to the operation of the electrostrictive actuator. As a result, it is possible to move up and down with respect to the valve seat, to intermittently interrupt the fuel injection, and to prevent the valve body from vibrating. Further, since the operation of the electrostrictive actuator is transmitted to the valve body through the fuel in the pump chamber, the response is high and accurate unlike the transmission by mechanical contact.

〔Example〕

 The present invention will be described below with reference to illustrated embodiments.

The fuel injection valve 100 is attached to an intake pipe of an internal combustion engine, a cylinder head, or the like, and injects fuel supplied from the feed pump 10 via the pressure regulator 11 from the injection port 102 by moving up and down the nozzle needle 101. The opening / closing operation of the nozzle needle 101 is performed by the electrostrictive actuator 103 and the control hydraulic pump 200. The hydraulic pump 200 is drive-controlled by the three-way valve 12 and supplies high-pressure fuel to the nozzle needle 101 via the reservoir 13. And urge it upwards.
The three-way valve 12 is switch-controlled by the controller 300,
The controller 300 is configured to operate in response to the pressure switch 14 attached to the reservoir 13.

The casing of the fuel injection valve 100 includes a nozzle holder 104 and a retaining nut 105. The nozzle holder 104 has a cylindrical space 106 inside, and the retaining nut 105 has a cylindrical space 107 having an inner diameter larger than that of the space 106. Male screw 1 of nozzle holder 104
08 are connected to each other by a female screw 109 of the retaining nut 105, thereby forming a stepped cylindrical space inside. The electrostrictive actuator 103, the pump piston 111, the disc spring 112, the distance piece 113, and the nozzle body 114 are housed in this space from the upper side of FIG.

The nozzle body 114 has a nozzle 102 at the lower end, and the nozzle 102 has an opening 115 for the retaining nut 105.
Located inside. The nozzle needle 101 is housed in the inner space of the nozzle body 114 so as to be vertically movable. The nozzle needle 101 has a stepped cylindrical shape, and the upper half has a large diameter portion 1
16, the lower half is the small diameter portion 117. Small diameter part 11
The lower end of 7 has a hemispherical shape and closes the injection port 102 when it is seated on a conical valve seat 118 formed above the injection port 102, and opens the injection port 102 when it is separated from the valve seat 118. The large diameter portion 116 of the nozzle needle 101 slides in a large diameter hole 119 formed above the shaft portion of the nozzle body 114, and the clearance between the two is about 20 μm in diameter.
Is. The small diameter portion 117 of the nozzle needle 101 slides in the small diameter hole 120 formed below the shaft portion of the nozzle body 114, and the clearance between them is about 2 μm in diameter. The movable range of the nozzle needle 101 in the axial direction is about 50.
μm, the upper end is limited by the distance piece 113, and the lower end is limited by the valve seat 118.

The connecting portion of the large hole diameter 119 and the small hole 120 of the nozzle body 114 is an annularly expanded space and forms a control oil sump 121. A fuel sump 122 is formed below the small diameter hole 120, and this is a control oil sump 12
The diameter is larger than 1. The control oil sump 121 has a nozzle body 114, a distance piece 113,
A control oil passage 123 that communicates with and extends through the nozzle holder 104 is in communication, and the control oil passage 123 communicates with a control oil inlet port 124 formed on the upper right side of the nozzle holder 104. On the other hand, similarly to the control oil passage 123, a fuel passage 125 communicating with the nozzle body 114, the distance piece 113, and the nozzle holder 104 is connected to the fuel reservoir 122. The fuel passage 125 communicates with a fuel inlet port 125 formed on the upper left side of the nozzle holder 104. Fuel puddle 122
When the nozzle needle 101 is separated from the valve seat 118, the fuel inside is injected from the injection port 102, and the nozzle needle 10
No. 1 rises when the fuel pressure in the control oil sump 121 becomes larger than the force that urges the nozzle needle 101 downward, and moves away from the valve seat 118.

The upper end surface of the nozzle needle 101 is polished to have a smooth surface, and can be brought into close contact with the lower surface of the distance piece 113 which is also polished to have a smooth flat surface. A hole 127 is formed in the center of the distance piece 113, and the hole 127 is closed by the nozzle needle 101 being in close contact with the distance piece 113. A pump piston 111 is arranged above the distance piece 113, and a pump chamber 128 is formed between the distance piece 113 and the pump piston 111. The inside of the pump chamber 128 communicates with the space inside the nozzle body 114 through the hole 127 of the distance piece 113. The pump piston 111 is attached to the lower end of an electrostrictive actuator 103 provided above the pump piston 111, and is urged upward by a disc spring 112 provided inside a pump chamber 128. The pump piston 111 moves up and down due to the expansion and contraction of the electrostrictive actuator 103, thereby changing the volume of the pump chamber 128. Due to this pump action, the pump piston 11
An O-ring 129 for sealing is attached to the outer periphery of 1.

Here, between the upper end surface of the nozzle needle 101 at the time of valve closing and the distance piece 113, the nozzle needle 101
Is formed to allow the upward movement of the. This space is formed between the large-diameter portion 116 of the nozzle needle 101 and the large-diameter portion 119 of the nozzle body 114, and is about 20.
It communicates with the control oil sump 121 via a clearance of μm. Therefore, a passage with a narrowed clearance is formed between the large diameter portion 116 and the large diameter portion 119, and the fuel in the control oil sump 121 is guided to the upper space and further to the pump chamber 128.

The electrostrictive actuator 103 has a cylindrical shape by stacking about 50 thin disk-shaped electrostrictive elements. The electrostrictive element is a ceramic called PZT, which contains lead zirconate titanate as a main component and which extends 1 μm when a voltage of 500 V is applied in its thickness direction. When 50 sheets are laminated and 500 V is applied in the thickness direction of each element, an extension of 50 μm is obtained as a whole. If this voltage is released or a slight negative voltage is applied, a reduction of 50 μm occurs and the length returns to the original length. Application and release of voltage is performed by an external control via a lead wire (not shown).

The nozzle holder 104 and the distance piece 11
A knock pin (not shown), for example, is provided to regulate the relative positions of the nozzle body 114 and the nozzle body 114 to secure the fuel passage 125 and the control oil passage 123.

The fuel injected by the injection valve 100 is supplied from the feed pump 10 to the fuel inlet port 126 via the pressure regulator 11. The feed pump 10 is an electric vane pump that pumps up and discharges fuel (gasoline) from the fuel dunk 15. This discharged fuel is 2.5 kg by the pressure regulator 11.
Maintain a pressure of / cm ² . Pressure regulator 11
Is a relief type, and the excess fuel is returned to the inlet of the feed pump 10 by the drain pipe 16.

Control oil for moving the nozzle needle 101 up and down to open and close the injection port 102 is supplied from the control hydraulic pump 200 to the control oil inlet port 124 via the check valve 17 and the reservoir 13. The hydraulic pump 200 is a diaphragm pump. That is, in the hydraulic pump 200, the inside of the casing 210 is transformed by the diaphragm 202 into the variable pressure chamber 20.
3 and the constant pressure chamber 204, and is constructed by attaching a piston 205 to the diaphragm 202. Piston 205
The front end cylindrical portion 206 of the above can face the inside of the pump chamber 207 formed below the casing 201, and can move up and down to change the volume of the pump chamber 207. Piston 20
5 is displaced downward when the pressure inside the variable pressure chamber 203 becomes relatively large to compress the pump chamber 207,
When the pressure in 3 becomes relatively small, the constant pressure chamber 240
It is biased by the pressure of the spring 208 provided inside and the pump chamber 207 to be displaced upward, and the pump chamber 207 is enlarged.
The effective area of the diaphragm 202 is about 25 times the effective area of the cylindrical portion 206 of the piston 205. The variable pressure chamber 203 is connected to the three-way valve 12 via the inlet port 209, and the constant pressure chamber 204 is connected to the fuel tank 15 via the hole 210. The pressure regulator 11 is connected to the pump chamber 207.
1 connecting the fuel inlet port 126 of the injection valve 100 with
A branch line 19 is connected in the middle of 8, and fuel having a pressure of 2.5 kg / cm ² is supplied through this line 19. A check valve 20 is provided in the middle of the pipeline 19.

The three-way valve 12 is an electromagnetic type, and when it is energized, the transformation chamber 20
3 is conducted to the discharge side of the feed pump 10, and the variable pressure chamber 203 is conducted to the fuel tank 15 when not energized. The energization of the three-way valve 12 is controlled by the controller 300, and the controller 300 detects the pressure in the reservoir 13 and controls it by the signal of the pressure switch 14 which opens and closes. The pressure in the reservoir 13 of the pressure switch 14 is 50 kg.
If it is less than / cm ^2, it will be closed (ON), and it will be over 50 kg / cm ² (OFF). When the pressure switch 14 is closed, the controller 300 energizes the three-way valve 12 for 3 seconds,
The stop for 3 seconds is periodically repeated. When the pressure switch 14 is open, the controller 300 does not energize the three-way valve 12.

FIG. 3 shows a circuit configuration of the controller 300. The battery 30 supplies a DC voltage of 12V to the controller 300 via an ignition switch 31 of the internal combustion engine,
This voltage is stabilized to 5V by the power supply circuit 301 and supplied to each part.

The oscillator circuit 302 having a well-known configuration generates a 682.7 Hz clock signal. This clock signal is connected to the clock input of a 12-bit binary counter 303, and a signal divided by Z ¹² = 4096, that is, a square wave with a period of 6 seconds is output to the Q ₁₂ terminal. This signal is inverted by the inverter 304 and connected to one input terminal of the 2-input AND gate 305.

The pressure switch 14 has a pressure of the reservoir 13 of 50 kg / cm.
It operates so that when it is ² or less, it is on, and when it is more than ² , it is off. The unidirectional terminal of the pressure switch 14 is connected to the ground, and the other is input to the controller 300. This signal is sent to the inverter 30 via the resistor 306.
7 is connected. Since the input signal of the inverter 307 is further pulled up to the positive power source via the resistor 308 and the capacitor 309, it becomes the “1” level when the pressure switch 14 is OFF and the “0” level when the pressure switch 14 is ON.

The output of the inverter 307 is the 2-input AND gate 305.
Is connected to the other input terminal of the binary counter 303, is inverted by the inverter 310, and is connected to the reset input R of the binary counter 303. 2-input AND gate 305
Output of the transistor 31 via the resistors 311 and 312.
3 connected to the base. The collector of the transistor 313 is connected to the solenoid three-way valve 12,
The other terminal of is connected to the ignition switch 31. Reference numeral 32 is a diode for protecting the transistor 313.

The operation of the controller 300 having the above configuration will be described. When the ignition switch 31 is turned on, the power stabilized by the power supply circuit 301 is supplied to each part of the controller 300. Immediately after the power is turned on, the voltage of the capacitor 309 is 0V, so that the input of the inverter 307 becomes the "1" level and the binary counter 303 is reset. Immediately after the ignition switch 31 is turned on, the pressure in the reservoir 13 is still low.
The pressure switch 14 is in the ON state, and the resistor 306
The capacitor 309 is rapidly charged through the input terminal and the input of the inverter 307 immediately becomes "0" level. Therefore, the reset of the binary counter 303 is released, and the clock signal from the oscillation circuit 302 starts counting. The output of the Q ₁₂ terminal of the binary counter 303 is at “0” level immediately after reset and is inverted by the inverter 304 to be at “1” level, resulting in a 2-input AND gate 305.
Entered in. Since the other input of the 2-input AND gate 305 is the output of the inverter 307 and is at the "1" level, the output of the 2-input AND gate 305 is at the "1" level and the transistor 3 via the resistors 311 and 312.
13 is turned on to energize the electromagnetic three-way valve 12.

After 3 seconds, the output from the Q ₁₂ terminal of the binary counter 303 becomes “1” level and is inverted by the inverter 304.
Therefore, since the input of the 2-input AND gate 305 becomes the “0” level, the transistor 313 becomes non-conductive,
The electromagnetic three-way valve 12 is no longer energized. After a further 3 seconds, the output from the Q ₁₂ terminal of the binary counter 303 becomes “0” level again and the electromagnetic three-way valve 12 is energized. Such an operation is repeated while the pressure switch 14 is ON. When the pressure switch 14 is turned off, the input of the inverter 307 becomes "1" level by the resistor 308 and the input of the 2-input AND gate 305 becomes "0" level, so that the transistor 313 immediately becomes non-conductive,
Energization of the electromagnetic three-way valve 12 is stopped. At this time, the binary counter 303 is reset via the inverter 310 and stands by for the next time the pressure switch 14 is turned on.

As described above, the controller 300 includes the pressure switch 1
When 4 is ON, the electromagnetic three-way valve 12 is energized for 3 seconds and periodically stopped for 3 seconds, and when the pressure switch 14 is OFF, it is operated so as not to be energized.

Since the present embodiment is configured as described above, the fuel injection valve 1
00 operates as follows.

Electrostrictive actuator 1 at the time when fuel injection should be stopped
A voltage of 500 V is applied to 03. As a result, the electrostrictive actuator 103 extends about 50 μm to lower the pump piston 111, the fuel in the pump chamber 128 is compressed and becomes a high pressure, and acts on the upper end surface of the nozzle needle 101 through the hole 127 and lowers it. Let As a result, the lower end of the nozzle needle 101 is pressed against the valve seat 118 to close the injection port 102, and the fuel supply to the injection port 102 is cut off.

The high-pressure fuel that acts on the upper end surface of the nozzle needle 101 leaks to the control oil sump 121 through the clearance between the large diameter portion 116 and the large diameter hole 119.
The hydraulic pressure of 21, that is, the fuel pressure of the reservoir 13 cannot be lowered, and the fuel pressure of at least 50 kg / cm ² continues to act on the entire upper end surface of the nozzle needle 101.
In the area corresponding to the difference in cross-sectional area between the large diameter portion 116 and the small diameter portion 117 of the nozzle needle 101, the oil pressure of the oil sump 121 is 5
Although 0 kg / cm ² acts upward, this hydraulic pressure is smaller than the downward force, and due to the difference force, the nozzle needle 10
1 continues to be pressed against the valve seat 118. That is, fuel puddle 1
22 of 2.5 kg / cm ² of fuel is cut off from the nozzle 102,
The injection valve 100 continues to maintain the closed state.

On the other hand, a slight negative voltage is applied to the electrostrictive actuator 103 at the time when fuel injection should be started, and
Release the voltage of 00V. As a result, the electrostrictive actuator 103 contracts by about 50 μm, and the pump piston 111
Is pushed by the disc spring 112 and rises. As a result, the pump chamber 128 expands to generate a negative pressure, and the pressure acting on the upper end surface of the nozzle needle 101 via the hole 127 is reduced.
Therefore, a pressure difference is generated above and below the large-diameter portion 116 of the nozzle needle 101 via the clearance between the large-diameter portion 116 and the large-diameter portion 119, and the nozzle needle 101 is affected by the hydraulic pressure of the oil sump 121 of 50 kg / cm ² . The upper surface of the nozzle needle 101 is pushed up and the distance piece 11
It adheres to the lower end surface of 3. In this state, the nozzle needle 1
There is no downward force acting on 01, the nozzle needle 101 remains at the upper end position, and the injection port 102 conducts with the fuel pool 122 to continue fuel injection. That is, the injection valve 100 continues to maintain the open state. After that, the operation for stopping the fuel injection is the same as described above, and the fuel can be injected by any engine at any time and in any engine according to the request of the internal combustion engine.

Next, the operation of supplying hydraulic pressure to the control oil sump 121 of the injection valve 100 will be described.

When the operation of the internal combustion engine is stopped, in the control hydraulic pump 200, the piston 206 is in the upper position in the figure due to the urging force of the spring 208, and the volume of the pump chamber 207 is maximized. At this time, although the pump chamber 207, the reservoir 13, the oil sump 121, and the fuel passage connecting them are filled with the fuel, the hydraulic pressure thereof is almost equal to the atmospheric pressure. When starting the internal combustion engine, close the ignition switch (O
When set to N), the feed pump 10 starts operating, and at the same time, the three-way valve 12 is energized for 3 seconds. Therefore, the discharge pressure of the feed pump 10 of 2.5 kg / cm ² is equal to that of the diaphragm 20.
It is possible to generate a pressure in the pump chamber 207 that is 25 times that of the pressure in the pump chamber 207. However, the discharge volume of the pump chamber 207 is 0.2 cc, whereas the front volume on the discharge side centering on the reservoir 13 exceeds 20 cc, so that even if the piston 206 makes a full stroke, the hydraulic pressure in the reservoir 13 will immediately increase. In some cases, it may not be possible to raise it above 50 kg / cm ² . At this time, the pressure switch 14 remains closed (ON). After the three-way valve 12 is energized for 3 seconds, the three-way valve 12 is de-energized for 3 seconds. Transformer room 2 during this power interruption
Since 03 is connected to the fuel tank 15,
The hydraulic pressure in 03 is reduced to atmospheric pressure, the urging force of the spring 208 raises the piston 206, and the pump chamber 207 performs the suction process. In the suction process, the fuel discharged from the foot pump 10 flows into the pump chamber 207 via the pressure regulator 11 and the check valve 20. In this way, the three-way valve 12 is de-energized for 3 seconds, during which the pump chamber 207 is sucked, and then energized again for 3 seconds. That is, the pump chamber 207 performs the discharging process again. If this operation is repeated several times at most, the reservoir 13
The internal hydraulic pressure reaches 50 kg / cm ² , the pressure switch 14 provided there is opened (OFF), at that moment the energization of the three-way valve 12 is stopped, and the pressure switch 14 is closed (ON) again. Until that state is maintained. Oil sump 1
Since 21 is electrically connected to the fuel pool 122 through the clearance between the small diameter portion 117 of the nozzle needle 101 and the small diameter portion 120, there is a slight leak of hydraulic pressure, and the pressure switch 14 is closed (ON) within a few minutes. Becomes
At this time, the three-way valve 12 is energized and the above-mentioned operation is performed. Therefore, in the reservoir 13, the hydraulic pressure with a small swing width centering on 50 kg / cm ² is constantly maintained.

The control hydraulic pump 200 is omitted and the reservoir 13
The fuel passage 18 and the fuel passage 18 may be connected only via the check valve 17. This is because if the discharge pressure of the feed pump 10 varies greatly, the highest hydraulic pressure can be used as the control hydraulic pressure.

Further, the pressure switch 14 may be omitted, and energization and stop of the three-way valve 12 may be periodically repeated. In this case, the power consumption for driving the three-way valve 12 may increase and the internal pressure of the reservoir 13 may rise too much, but the basic operation is the same as that of the above-described embodiment.

〔The invention's effect〕

In the fuel injection valve according to the present invention, a second fuel supply system for supplying fuel at a constant pressure higher than that of the first fuel supply diameter for supplying fuel to the upstream side of the valve seat is provided. Since the fuel supplied from the second fuel supply system is guided to the control hot water pool to urge the valve element, the pressure of the fuel supplied to the upstream side of the valve seat is Even if the pressure becomes low, the pressure of the fuel in the second fuel supply system for driving the valve disc does not fluctuate, and the valve disc can always be reliably energized. As a result, the electrostrictive actuator stabilizes the valve. Thus, the fuel injection valve can be opened and closed accurately. Further, since the magnitude of the force for urging the valve body is constant, the valve body does not vibrate even when the valve is opened, so that the fluctuation of the fuel amount injected from the fuel injection valve is suppressed. Furthermore, since the operation of the electrostrictive actuator is transmitted to the valve body via the fluid in the pump chamber, the response is higher and more accurate than that by mechanical contact.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, a system diagram with a cross section of the main part, FIG. 2 is a graph showing the operating relationship between a three-way valve and a pressure switch, and FIG. 3 is a circuit diagram of a controller. 100 ... Fuel injection valve, 101 ... Nozzle needle, 102 ... Injection port, 103 ... Electrostrictive actuator 118 ... Valve seat, 121 ... Control oil sump (opening means), 122 ... Material sump (fuel Supply means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Yoshinaga 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Prefecture Japan Auto Parts Research Institute (72) Inventor Masayuki Abe 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Stock Association Japan Auto Parts Research Institute (72) Inventor Kazuhide Watanabe 14 Iwatani, Shimohakaku-cho, Nishio City, Aichi Prefecture Japan Auto Parts Research Institute (56) Reference JP-A-59-58129 (JP, A) JP 57-79256 (JP, A)

Claims (4)

[Claims] 1. A nozzle body (114) having a valve seat (118) formed therein, and a fuel injection from a nozzle hole (102) provided so as to be reciprocally movable with respect to the nozzle body and contacting and separating from the valve seat. A valve body (101) for connecting and disconnecting the fuel, and an injection fuel pool (1) for supplying fuel upstream of the valve seat.
22) and the fuel pool for injection are formed so as to be partitioned from each other, and the fuel pressure supplied thereto acts on the control oil pool (121) to act in the valve opening direction of the valve body; A pump chamber (128) having a substantially closed chamber shape formed facing the end face on the side opposite to the valve seat, and the volume of the pump chamber is changed by expanding and contracting so that the valve body is brought into contact with the valve seat. An electrostrictive actuator (103) to be separated, and a first for supplying fuel of a predetermined pressure to the fuel pool for injection
Second fuel supply system, which is a system separate from the first fuel supply system and supplies a fuel having a constant pressure relatively higher than that of the fuel in the injection fuel pool to the control fuel pool. And a supply system. 2. The fuel of the second fuel supply system is supplied to the pump chamber via a passage narrowed from the control oil sump. Fuel injection valve. 3. A distance piece (113) is provided between the pump chamber and the end surface of the valve body, the distance piece (113) contacting the valve body when the valve body separates from the valve seat. The fuel injection valve according to claim 1, wherein a hole (127) is formed which is closed by the end surface of the valve body when the valve body separates from the valve seat. 4. The second fuel supply system introduces fuel from the first fuel supply system and blocks outflow of fuel from the second fuel supply system to the first fuel supply system. Fuel injection valve according to claim 1, characterized in that it comprises a check valve (20).