JP2010048140A - Fuel injection device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection device for an internal combustion engine, capable of controlling separation to be promoted or suppressed in nozzle holes. <P>SOLUTION: The fuel injection device 1A comprises a first protruded part 24 provided at the front end of a needle 6 for suppressing the separation of fuel which occurs in a nozzle hole group 19, when interfering with fuel flowing from a fuel passage 20 to the nozzle hole group 19, a second protruded part 25 provided at the front end of the needle 6 for promoting the separation of fuel which occurs in the nozzle hole group 19 when interfering with the fuel flowing from the fuel passage 20 to the nozzle hole group 19, a motor 12 for rotating the needle 6, and a control device 14 for controlling the operation of the motor 12 to rotate the needle 6 between such a separation suppressing condition that the first protruded part 24 interferes with the fuel flowing from the fuel passage 20 to the nozzle hole group 19 and such a separation promoting condition that the second protruded part 25 interferes with the fuel flowing from the fuel passage 20 to the nozzle hole group 19. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel injection device for an internal combustion engine provided with a fuel injection valve provided with a needle housed in a nozzle body so as to be reciprocally movable and rotatable.

  A nozzle needle capable of reciprocating in the axial direction, and a nozzle body having an injection hole portion for injecting fuel. The injection hole portion of the nozzle body includes a plurality of injection hole flow paths through which the fuel enters the combustion chamber, and these There is known a fuel injection nozzle having an annular communication passage that communicates between the intermediate portions of the nozzle hole passage (see, for example, Patent Document 1). In addition, Patent Documents 2 and 3 exist as prior art documents related to the present invention.

JP 2004-316598 A JP-A-7-145767 Japanese Patent Laid-Open No. 7-22063

  It is known that fuel combustion efficiency is improved by atomization of fuel. For this reason, in the fuel injection nozzle of patent document 1, in order to improve the atomization performance of the fuel to inject, the injection hole shape which produces many separation points of a fuel flow is employ | adopted. In the fuel injection nozzle of Patent Document 1, fuel atomization is promoted by the fuel separation effect at the nozzle hole, while penetration is increased and the spray reach distance is extended. By extending the spray reach distance, depending on the injection conditions (injection timing), the fuel adhesion amount on the cylinder wall surface or the piston upper surface may increase, and the combustion efficiency may be lowered.

  Therefore, an object of the present invention is to provide a fuel injection device for an internal combustion engine that can control the promotion and suppression of separation at the nozzle hole.

  The fuel injection device of the present invention comprises a fuel injection valve provided with a nozzle body provided with an injection hole at the tip, and a needle accommodated in the nozzle body so as to be reciprocally movable and rotatable. In a fuel injection device for an internal combustion engine that injects fuel that has passed through a fuel passage formed between the nozzle and the needle from the nozzle hole of the nozzle body, the fuel injection device is provided at the tip of the needle and is injected from the fuel passage. A first protrusion capable of suppressing the separation of fuel generated in the nozzle hole when interfering with fuel flowing through the hole, and when interfering with fuel flowing from the fuel flow path to the nozzle hole provided at the tip of the needle The second protrusion that can promote the separation of the fuel generated in the nozzle hole, the drive means that can rotate the needle, and the first protrusion that dries the fuel flowing from the fuel flow path to the nozzle hole. Control means for controlling the operation of the driving means so that the needle rotates between a peeling suppression state in which the needle is rotated and a peeling promotion state in which the second protrusion interferes with fuel flowing from the fuel flow path to the nozzle hole To solve the above-described problem (claim 1).

  According to this fuel injection device, the first protrusion that can suppress the separation at the nozzle hole and the second protrusion that can promote the separation at the nozzle hole are provided at the tip of the needle, and the first protrusion is the fuel flow. It is controlled by the control means so that the needle rotates between a separation suppression state that interferes with the fuel flowing from the passage to the nozzle hole and a separation promotion state in which the second protrusion interferes with the fuel flowing from the fuel channel to the nozzle hole. The Therefore, for example, when it is desired to promote atomization of fuel, it can be in a peeling acceleration state, and when it is desired to suppress the spray reach distance, it can be in a peeling suppression state. You can use the state properly.

  In one aspect of the fuel injection device of the present invention, the control means includes the separation suppression state, the separation promotion state, and the like according to a fuel injection condition including at least one of a fuel injection timing, an injection period, and an injection amount. The operation of the driving means may be controlled such that the needle rotates between the two (claims 2). In this case, the state of separation occurring at the nozzle hole is controlled according to the fuel injection conditions. Therefore, the peeled state can be properly used according to the fuel injection conditions. For example, if the fuel injection timing is delayed and there is a concern about the fuel adhering to the piston, the separation is suppressed, and if it is desired to promote fuel atomization by early fuel injection, the separation acceleration state It can be.

  In one aspect of the fuel injection device of the present invention, the first protrusion and the second protrusion may have any shape as long as fuel separation at the injection hole can be suppressed and promoted. For example, a flat bottom surface provided with the nozzle hole is formed at the tip of the nozzle body, and a flat bottom surface facing the bottom surface of the nozzle body is formed at the tip of the needle, The first protrusion is provided on the bottom surface of the needle, extends along the radial direction of the needle, and the amount of protrusion gradually decreases toward the center of rotation of the needle. The needle is provided on the bottom surface of the needle, extends along the radial direction of the needle, and gradually protrudes toward the rotation center of the needle. The peeling prevention position where the nozzle hole is located on the extension of the first protrusion is the peeling promotion state, and the peeling promotion position where the nozzle hole is located on the extension of the second protrusion in the radial direction of the needle is the peeling promotion state. Position, may be set respectively (claim 3).

  1 aspect of the fuel-injection apparatus of this invention WHEREIN: As an injection hole, the inner side injection hole located in the radial inside of the said nozzle body, and the outer side located in the radial direction outer side of the said nozzle body rather than the said inner injection hole The needle has an inner needle and an outer needle that are independently rotatable, and the tip of the inner needle has the first protrusion corresponding to the inner nozzle hole and the needle. A second protrusion is provided, and the tip of the outer needle is provided with the first protrusion and the second protrusion corresponding to the outer nozzle hole, and the driving means includes the inner needle and the second needle. An outer needle can be rotated independently, and the control means controls the operation of the driving means so that the inner needle rotates between the peeling suppression state and the peeling acceleration state, and Said exfoliation suppression Wherein said outer needle between the state and the peeling promoter condition may control the operation of said drive means to rotate (claim 4).

  According to this aspect, the interference state of the first protrusion and the second protrusion provided on the inner needle and the interference state of the first protrusion and the second protrusion provided on the outer needle are controlled independently. Is done. For this reason, the inner needle can be set in a peeling promotion state, and the outer needle can be set in a peeling suppression state. Conversely, the inner needle can be in a peel-inhibited state and the outer needle can be in a peel-promoted state. The flow resistance is larger in the nozzle hole in the peel-suppressed state. For this reason, when the inner needle is in the peeling acceleration state and the outer needle is in the peeling suppression state, the amount of fuel outflow from the inner nozzle hole is larger than that of the outer nozzle hole. Can be stretched. In addition, when the inner needle is set in the peeling suppression state and the outer needle is set in the peeling promotion state, the amount of fuel flowing out from the outer nozzle hole is increased more than the inner nozzle hole. It can be generated and atomization can be promoted. Therefore, the peeling state at the nozzle hole can be used more finely.

  As described above, according to the fuel injection device of the present invention, the first protrusion that can suppress the separation at the nozzle hole and the second protrusion that can promote the separation at the nozzle hole are provided at the tip of the needle. The needle rotates between the peel suppression state in which the first protrusion interferes with the fuel flowing from the fuel flow path to the nozzle hole and the separation promotion state in which the second protrusion interferes with the fuel flowing from the fuel flow path to the nozzle hole. It is controlled by the control means. For this reason, promotion and suppression of peeling at the nozzle hole can be controlled.

(First form)
FIG. 1 shows a fuel injection device according to an embodiment of the present invention. The fuel injection device 1A is applied to an internal combustion engine mounted on a vehicle as a driving power source. 1 A of fuel injection apparatuses are provided with the nozzle body 4, the needle 6, the motor 12 as a drive means which can rotate the needle 6, and the control apparatus 14 as a control means.

  The nozzle body 4 accommodates a needle 6 that can reciprocate and rotate about an axis Ax. The nozzle body 4 is formed in a substantially cylindrical shape, and a flat bottom surface 16 is formed at the tip. The needle 6 accommodated in the nozzle body 4 is also formed in a substantially columnar shape, and a flat bottom 18 facing the bottom 16 of the nozzle body 4 is formed at the tip. The nozzle body 4 is provided with a nozzle hole group 19 on the bottom surface 16 at the tip. A fuel flow path 20 is formed between the nozzle body 4 and the needle 6. When the needle 6 in the nozzle body 4 is lifted upward from the valve seat 21, the fuel flow path 20 is opened, and the fuel that has passed through the fuel flow path 20 is injected from the nozzle hole group 19 provided at the tip of the nozzle body 4. The In a state where the needle 6 is in contact with the valve seat 21 of the nozzle body 4, the fuel flow path 20 is closed, so that fuel is not injected from the injection hole group 19.

  2 and 4 are explanatory diagrams viewed from the direction of the axis Ax of the fuel injection device 1A according to the first embodiment of the present invention. The nozzle hole group 19 includes four inner nozzle holes 22 provided radially inward of the bottom surface 16 of the nozzle body 4, and four outer nozzle holes 23 provided radially outward of the inner nozzle holes 22. It is included. The inner nozzle hole 22 and the outer nozzle hole 23 are arranged at a substantially constant interval in the radial direction. Moreover, each nozzle hole 22 and 23 is arranged in the 90 degree space | interval regarding the circumferential direction. 3 is a schematic cross-sectional view taken along the line III-III in FIG. 2, and FIG. 5 is a schematic cross-sectional view taken along the line V-V in FIG. As shown in FIGS. 3 and 5, each nozzle hole 22, 23 is formed such that the center line thereof is inclined at an acute angle with respect to the axis Ax of the needle 6. Thereby, the jet direction of the fuel from each nozzle hole 22, 23 forms an acute angle with respect to the fuel flow flowing through the fuel flow path 20.

  A first protrusion 24 and a second protrusion 25 having different functions are provided at the tip of the needle 6 in order to control separation occurring at the nozzle holes 22 and 23. The first protrusion 24 can suppress the separation that occurs at each nozzle hole 22, 23 when it interferes with the fuel flowing through each nozzle hole 22, 23. On the other hand, the second protrusion 25 can promote the separation that occurs at each nozzle hole 22, 23 when it interferes with the fuel flowing through each nozzle hole 22, 23. 2 and 3 show a case where the first protrusion 24 is in a peeling suppression state in which it interferes with the fuel flowing through the nozzle holes 22 and 23. On the other hand, FIGS. 4 and 5 show a case where the second protrusion 25 is in a peeling acceleration state in which it interferes with the fuel flowing through the nozzle holes 22 and 23. Four first protrusions 24 and two second protrusions 25 are provided on the inner side in the radial direction so as to correspond to the inner injection hole 22, and four on the outer side in the radial direction so as to correspond to the outer injection hole 23. Yes. The first protrusions 24 provided on the inner side and the outer side are arranged at intervals of 90 ° with respect to the rotation direction. Similarly to the first protrusion 24, the second protrusions 25 provided on the inner side and the outer side are also arranged at intervals of 90 ° with respect to the rotation direction. Since the first protrusion 24 and the second protrusion 25 are provided on the bottom surface 18 of the needle 6 at an interval of 45 ° with respect to the rotation direction, the needle 6 is rotated 45 ° from the peel-suppressed state shown in FIGS. By doing so, the peeling acceleration state shown in FIGS. 4 and 5 is obtained.

  As shown in FIGS. 2 and 3, the first protrusion 24 extends along the radial direction of the needle 6, and the amount of protrusion gradually decreases toward the rotation center of the needle 6. That is, the first protrusion 24 has a radius of the bottom surface 18 until the cross-sectional area of the fuel flow path 20 between the bottom surface 18 of the needle 6 and the bottom surface 16 of the nozzle body 4 is once reduced and then returns to the original cross-sectional area. It is formed so as to gradually increase the cross-sectional area linearly toward the inner side in the direction. On the other hand, as shown in FIGS. 4 and 5, the second protrusion 25 extends along the radial direction of the needle 6, and the amount of protrusion gradually increases toward the center of rotation of the needle 6. That is, the cross-sectional area of the fuel flow path 20 between the bottom surface 18 of the needle 6 and the bottom surface 16 of the nozzle body 4 is formed so as to be gradually reduced linearly toward the inside in the radial direction of the bottom surface 18. In other words, the second protrusion 25 is formed in a shape in which the first protrusion 24 is directed in the direction opposite to the radial direction of the bottom surface 18 at the tip of the needle 6.

  2 and 3, the nozzle holes 22 and 23 are positioned on the extension of the first protrusion 24 in the radial direction of the needle 6, and the first protrusion 24 is set at the separation suppressing position. In this case, the fuel injection device 1 </ b> A is in a peeling suppression state. On the other hand, in FIG.4 and FIG.5, each nozzle hole 22 and 23 is located on extension of the 2nd protrusion 25 regarding the radial direction of the needle 6, and the 2nd protrusion 25 is set to the peeling acceleration | stimulation position. In this case, the fuel injection device 1A is in a peeling acceleration state.

  FIG. 6 is a view schematically showing the fuel flow and separation state generated in the nozzle holes 22 and 23 when the first protrusion 24 and the second protrusion 25 are not in an interference state. A solid line arrow 26 indicates a fuel flow, and a broken line arrow 28 indicates a peeling state. As shown in FIG. 6, since the center line of each nozzle hole 22, 23 forms an acute angle with respect to the fuel flow flowing through the fuel flow path 20, the flow direction of the fuel flow in each nozzle hole 22, 23 is It is changed to an acute angle and peeling occurs.

  FIG. 7 is a diagram schematically showing the fuel flow when in the peeling suppression state. As shown in FIG. 7, when in the peel suppression state, unlike the case shown in FIG. 6, the fuel that wraps around in accordance with the inclination of the center line of the nozzle holes 22 and 23 due to the interference of the first protrusion 24. Stream 26 is produced. For this reason, compared with the case of FIG. 6, when it exists in a peeling suppression state, the peeling which arises in the nozzle holes 22 and 23 can be suppressed.

  FIG. 8 is a diagram schematically showing the fuel flow in the peeling acceleration state. In this case, unlike the cases of FIGS. 6 and 7, the flow direction of the fuel flow is changed at an acute angle toward the nozzle holes 22 and 23 due to the interference of the second protrusion 25. For this reason, when it is in the peeling acceleration state, the peeling occurring at the nozzle holes 22 and 23 can be further promoted as compared with the case of FIG.

  The control device 14 is configured as a computer that controls the operation of the motor 12 according to a predetermined program while referring to signals output from various sensors (not shown). The control device 14 obtains injection timing information from a sensor (not shown), and when the fuel is injected late, controls the operation of the motor 12 to rotate the needle 6 so as to be in a peeling suppression state. On the other hand, when the fuel is injected at an early stage, the operation of the motor 12 is controlled so as to be in the peeling acceleration state, and the needle 6 is rotated. Depending on the injection conditions, the operation of the motor 12 can be controlled so that neither the first protrusion 24 nor the second protrusion 25 interferes.

  Since the combustion efficiency of fuel is increased by atomization, the combustion efficiency increases when the separation is promoted to promote atomization. On the other hand, when the fuel injection timing is late, if the separation is promoted, the spray reach distance may be extended and the fuel may adhere to the piston or the like, resulting in low combustion efficiency. However, according to this embodiment, the control device 14 controls the separation suppression state and the separation promotion state according to the fuel injection timing. Therefore, if you want to promote atomization of fuel, you can use the peeling acceleration state, and if you want to suppress the spray reach, you can set the peeling suppression state. Can be used properly. The control device 14 may be provided exclusively for controlling the rotation of the needle 6, but an engine control unit (ECU) that controls the operating state of the internal combustion engine may function as the control device 14.

(Second form)
A fuel injection device 1B according to a second embodiment of the present invention will be described with reference to FIGS. 9 and 11 are explanatory diagrams viewed from the direction of the axis Ax of the fuel injection device 1B according to the second embodiment of the present invention. Below, the same code | symbol is attached | subjected to FIGS. As shown in FIG. 9, in the 2nd form, the needle 6 has the inner needle 30 and the outer needle 32 which can rotate independently, respectively. The bottom surface 18 of the inner needle 30 includes four first protrusions 24 and four second protrusions 25 provided inside the bottom surface 18 of the needle 6 in the radial direction. The first protrusion 24 and the second protrusion 25 correspond to the inner injection hole 22 of the bottom surface 16 of the nozzle body 4. The bottom surface 18 at the tip of the outer needle 32 includes four first protrusions 24 and four second protrusions 8 provided on the radially outer side of the bottom surface 18 of the needle 6. These first protrusion 24 and second protrusion 25 correspond to the outer injection hole 23 of the bottom surface 16 of the nozzle body 4. The motor 12 can rotate the inner needle 30 and the outer needle 32 independently.

  10 is a schematic cross-sectional view taken along line XX in FIG. 9 and 10 show a case where the inner needle 30 is in a peel-promoting state and the outer needle 32 is in a peel-inhibiting state. On the other hand, FIG. 12 is a schematic sectional view taken along line XII-XII in FIG. 11 and 12 show a case where the inner needle 30 is in a peel-inhibited state and the outer needle 32 is in a peel-promoting state. When the inner needle 30 and the outer needle 32 are rotated together from the state of FIGS. 9 and 10, the state of FIGS. 11 and 12 is obtained.

  According to this embodiment, the control device 14 includes an operation in which the inner needle 30 rotates between the peeling suppression state and the peeling acceleration state and an operation in which the outer needle 32 rotates between the peeling suppression state and the peeling acceleration state. Controlled independently. For this reason, the inner needle 30 shown in FIG. 10 is in the peeling acceleration state and the outer needle 32 is in the peeling suppression state, and the inner needle 30 shown in FIG. 12 is in the peeling suppression state and the outer needle 32 is in the peeling acceleration state. The state to be used can be further properly used. The flow resistance is larger in the peeling suppression state than in the peeling acceleration state. For this reason, in a state in which peeling is promoted by the inner needle 30 and peeling is suppressed by the outer needle 32, the second protrusion 25 of the inner needle 30 is more than the outer nozzle hole 23 with which the first protrusion 24 of the outer needle 32 interferes. Since the amount of fuel outflow from the inner nozzle hole 22 that interferes increases, the contraction of the spray can be promoted and the spray reach distance can be extended. Further, in the state where the inner needle 30 suppresses the separation and the outer needle 32 promotes the separation, the fuel from the outer injection hole 23 in which the second protrusion 25 interferes rather than the inner injection hole 22 in which the first protrusion 24 interferes. Since the outflow amount increases, sufficient separation occurs on the outside of the injected fuel, and atomization can be promoted. As described above, in the second embodiment, variations in the peeled state are increased as compared with the first embodiment, and therefore, the peeled state at each of the nozzle holes 22 and 23 can be used more finely.

(Third form)
A fuel injection device 1C according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 13 is an explanatory diagram viewed from the direction of the axis Ax of the fuel injection device 1C according to the third embodiment of the present invention. Below, the same code | symbol is attached | subjected to FIGS. As shown in FIG. 13, in the third embodiment, instead of the first protrusion 24 and the second protrusion 25, a first convex recess 36 and a second convex recess 38 are annular on the bottom surface 18 at the tip of the needle 6. Is provided. The first convex recess 36 interferes with the fuel flowing through the inner injection hole 22 of the nozzle body 4, and the second convex recess 38 is formed so as to interfere with the fuel flowing through the outer injection hole 23 of the nozzle body 4. FIG. 14 is a schematic cross-sectional view regarding the XIV-XIV line in FIG. FIG. 15 is a diagram showing the relationship between the height of the first convex recess 36 and the second convex recess 38 and the rotation angle of the needle 6 with respect to the bottom surface position of the needle 6. The heights of the first convex recess 36 and the second convex recess 38 are equal to the bottom surface position of the needle 6 at a rotation angle of 0 °. Then, the heights of the first convex recess 36 and the second convex recess 38 increase according to the change in angle with respect to the circumferential direction, and are highest at the rotation angle θ, and then decrease in height to the original needle 6 at the rotation angle θmax. Return to the height of the bottom position. Until the rotation angle returns to 0 ° with respect to the circumferential direction, the heights of the first and second concave portions 36 and 38 repeat the same change.

  According to this embodiment, by adjusting the rotation angle of the needle 6, the heights of the first convex recess 36 and the second convex recess 38 that interfere with the fuel flowing through the nozzle holes 22, 23 can be finely adjusted. Thereby, the optimal peeling state according to various fuel injection conditions can be used properly finely. The needle 6 according to the third embodiment has an inner needle 30 and an outer needle 32, the inner needle 30 is provided with a first convex recess 36, the outer needle 32 is provided with a second convex recess 38, The needle 30 and the outer needle 32 may be rotated independently, and the separation state may be used more finely.

  The present invention is not limited to the above embodiments, and can be implemented in various forms within the scope of the gist of the present invention. The number of each of the nozzle holes 22 and 23 may be any number, and is not limited to each of the above forms. Further, the nozzle holes 22 and 23 may be provided at any interval in the circumferential direction. Further, the first protrusion 24 and the second protrusion 25 correspond to the positions of the nozzle holes provided in the nozzle body and can be interfered with the fuel flowing through the nozzle holes, so long as they are provided anywhere on the needle. Good. The nozzle hole may be configured in any shape, and is not limited to a configuration in which the center line is inclined at an acute angle on the bottom surface of the tip of the nozzle body 4. Further, the shapes of the first protrusion and the second protrusion are not limited to the above-described forms, and may be any shape as long as separation at the nozzle hole can be suppressed or promoted.

  Further, the control of the rotation operation of the needle 6 by the control device 14 is not limited to that performed according to the fuel injection timing. For example, the rotation operation of the needle 6 may be controlled according to the fuel injection conditions such as the fuel injection amount and the fuel injection period. The driving means for rotating the needle 6 is not limited to the motor 12. For example, the structure which drives mechanically using the motive power which an internal combustion engine outputs may be sufficient.

The figure which shows the fuel-injection apparatus which concerns on one form of this invention. In the fuel-injection apparatus which concerns on the 1st form of this invention, explanatory drawing seen from the axis line Ax direction in the case of being in a peeling suppression state. The cross-sectional schematic diagram regarding the III-III line in FIG. In the fuel-injection apparatus which concerns on the 1st form of this invention, explanatory drawing seen from the axis line Ax direction in the case of being in a peeling acceleration state. The cross-sectional schematic diagram regarding the VV line in FIG. The schematic diagram of the fuel flow and peeling state in a nozzle hole in case a 1st protrusion and a 2nd protrusion are not in an interference state. The schematic diagram which shows the fuel flow in a nozzle hole when it exists in a peeling suppression state. The schematic diagram which shows the fuel flow in a nozzle hole in the case of being in a peeling acceleration | stimulation state. In the fuel-injection apparatus which concerns on a 2nd form, explanatory drawing seen from the axis line Ax direction in case an inner needle is a peeling acceleration state and an outer needle is in a peeling suppression state. The cross-sectional schematic diagram regarding the XX line in FIG. In the fuel-injection apparatus which concerns on a 2nd form, explanatory drawing seen from the axis line Ax direction in case an inner needle is in a peeling suppression state and an outer needle is in a peeling acceleration state. FIG. 12 is a schematic sectional view taken along line XII-XII in FIG. 11. Explanatory drawing seen from the axis line Ax direction of the fuel-injection apparatus which concerns on a 3rd form. FIG. 14 is a schematic cross-sectional view related to the XIV-XIV line in FIG. 13. The figure which shows the relationship between the height of a 1st convex recessed part and a 2nd convex recessed part, and the rotation angle of a needle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Fuel injection apparatus 2 Internal combustion engine 4 Nozzle body 6 Needle 12 Motor (drive means)
14 Control device (control means)
16 bottom surface 18 bottom surface 19 nozzle hole group 20 fuel flow path 24 first protrusion 25 second protrusion

Claims (4)

A fuel injection valve provided with a nozzle body provided with a nozzle hole at the tip and a needle housed in the nozzle body so as to reciprocate and rotate freely is formed between the nozzle body and the needle. In a fuel injection device for an internal combustion engine that injects fuel that has passed through a fuel flow path from the nozzle hole of the nozzle body,
A first protrusion that is provided at a tip of the needle and that can suppress fuel peeling that occurs in the nozzle hole when it interferes with fuel flowing from the fuel flow path to the nozzle hole;
A second protrusion that is provided at the tip of the needle and can promote the separation of fuel generated in the nozzle hole when it interferes with fuel flowing from the fuel flow path to the nozzle hole;
Drive means capable of rotating the needle;
A separation suppression state in which the first protrusion interferes with fuel flowing from the fuel flow path to the nozzle hole, and a separation promotion state in which the second protrusion interferes with fuel flowing from the fuel flow path to the nozzle hole. And a control means for controlling the operation of the drive means so that the needle rotates between them.   The control means is configured so that the needle rotates between the separation suppression state and the separation promotion state according to a fuel injection condition including at least one of a fuel injection timing, an injection period, and an injection amount. The fuel injection device according to claim 1, wherein the operation of the driving means is controlled. A flat bottom surface provided with the nozzle holes is formed at the tip of the nozzle body,
A flat bottom surface facing the bottom surface of the nozzle body is formed at the tip of the needle,
The first protrusion is provided on the bottom surface of the needle, extends along a radial direction of the needle, and gradually protrudes toward the rotation center of the needle,
The second protrusion is provided on the bottom surface of the needle, extends along the radial direction of the needle, and gradually protrudes toward the rotation center of the needle,
In the peeling suppression state, the peeling suppression position where the nozzle hole is located on the extension of the first protrusion in the radial direction of the needle is in the peeling acceleration state, and the second protrusion in the radial direction of the needle is in the peeling acceleration state. The fuel injection device according to claim 1 or 2, wherein a separation promoting position where the nozzle hole is located on an extension is set. As the nozzle hole, an inner nozzle hole located on the inner side in the radial direction of the nozzle body and an outer nozzle hole located on the outer side in the radial direction of the nozzle body than the inner nozzle hole are provided,
The needle has an inner needle and an outer needle that are independently rotatable,
The tip of the inner needle is provided with the first protrusion and the second protrusion corresponding to the inner nozzle hole,
The tip of the outer needle is provided with the first protrusion and the second protrusion corresponding to the outer nozzle hole,
The drive means can rotate the inner needle and the outer needle independently,
The control means controls the operation of the driving means so that the inner needle rotates between the peeling suppression state and the peeling acceleration state, and between the peeling suppression state and the peeling acceleration state. The fuel injection valve according to claim 1 or 2, wherein the operation of the driving means is controlled so that the outer needle rotates.

Images