JP4222286B2 - Fuel injection device - Google Patents

Description

  The present invention relates to a fuel injection device.

  As a fuel injection device, for example, a fuel injection valve that directly injects fuel into a cylinder of an internal combustion engine, that is, a combustion chamber is known. The fuel supplied from this type of fuel injection valve is mixed with air in the combustion chamber to form a combustible mixture in the combustion chamber. The combustible air-fuel mixture in the combustion chamber is compressed by piston motion, and then ignited and combusted by an ignition device such as a spark plug, and used as power for the internal combustion engine. The characteristics and shape of the fuel spray injected from the fuel injection valve are optimal depending on the engine operating state.

  As a means for realizing this, Patent Document 1 discloses a technique of switching the spray shape using two fuel injection valves provided in a cylinder. The first fuel injection valve is capable of fuel injection suitable for so-called stratified combustion into a cavity formed at the top of the piston during the compression stroke, and the second fuel injection valve is compared with the first fuel injection valve. It can be injected to the spark plug side and injected mainly during the intake stroke, and is suitable for homogeneous combustion.

Patent Document 2 discloses a technique for making the opening area of the injection hole formed in the injection hole plate variable. According to the prior art disclosed in this Patent Document 2, the nozzle hole plate is configured by a piezoelectric element, and a voltage is applied to the nozzle plate to expand or contract the nozzle hole plate so that the nozzle hole can be reduced or expanded. ing.
JP 2001-214744 A Japanese Patent Laid-Open No. 11-107890

  In the prior art, it is difficult to switch to a spray shape that is truly required for an engine operating state or the like using one fuel injection valve, for example, switching to a fuel spray suitable for stratified combustion and a fuel spray suitable for homogeneous combustion.

  In recent years, there has been a demand for variable nozzle technology. However, in the conventional technology such as Patent Document 2 described above, for example, it is necessary to provide a piezoelectric element in addition to the injection solenoid, which leads to a complicated system. There is a problem that cost increases are inevitable.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fuel injection device capable of simplifying a configuration having a function of switching the characteristics, shape, etc. of spraying with a single fuel injection valve. It is to provide.

  Another object is to simplify the structure having a function of switching the characteristics, shape, etc. of the spray with a single fuel injection valve and to change the fuel injection direction or to partially prohibit the fuel injection. To provide an apparatus.

In order to achieve the above object, the present invention comprises the following technical means. In the fuel injection device according to any one of claims 1 to 8 , a nozzle body having a first injection hole and a second injection hole, and a first needle that is movably disposed in the nozzle body and opens and closes the first injection hole. And a nozzle needle having a second needle that opens and closes the second nozzle hole, a movable core capable of cooperating with the nozzle needle, a core made of a magnetic material opposed to the movable core in the axial direction, and a movable core and a core A drive coil capable of applying a magnetic force by energization and a magnetized member capable of attracting and repelling the core to the non-movable core side, and the nozzle needle independently increase or decrease the opening area of the first nozzle hole and the second nozzle hole It is characterized by letting.

  According to this, the first nozzle hole and the second nozzle hole provided in the nozzle body are opened and closed by the first needle and the second needle constituting the nozzle needle, respectively. Furthermore, as drive means for driving the first needle and the second needle, a movable core, a core made of a magnetic material facing the movable core in the axial direction, and a drive coil capable of applying a magnetic force to the movable core and the core, For example, it has a core according to the magnetic pole direction of the magnetic force, and a magnetized member that can be attracted and repelled on the anti-movable core side, and the injection hole areas of the first injection hole and the second injection hole are independent. To increase or decrease. Accordingly, the first needle and the second needle can be driven and the nozzle hole areas of the first nozzle hole and the second nozzle hole can be switched independently by a simple configuration using an electromagnetic driving unit such as a magnetizing member and a driving coil. Therefore, it is possible to simplify the configuration having the function of switching the spray characteristics, shape, and the like with a single fuel injection valve.

  The magnetizing member may be any member that is magnetized so as to generate a predetermined magnetic force, such as a magnetized permanent magnet or a coil different from the drive coil.

In particular, magnetic fuel injection device according to claim 1 of the present invention, the magnetization member is a permanent magnet disposed in the counter movable core side of the core, which is formed around the drive coil when energized to drive coil Located outside the circuit.

  In the driving means for driving the first needle and the second needle, when the magnetizing member is a driving member such as a coil that generates magnetic force by supplying current, for example, in addition to the power consumption for driving the driving coil, the driving member The amount of power consumption for driving is required. On the other hand, in the fuel injection device according to claim 2, a permanent magnet that is magnetized and magnetized so as to always generate a predetermined magnetic force is used as the magnetizing member. The amount of power consumption for driving the fuel injection device having the above can be reduced.

In the fuel injection device according to the first aspect of the present invention, the first needle and the second needle are doubled inside and outside.

According to this, since the first needle and the second needle are doubly arranged inside and outside, the first needle and the second needle are connected to the nozzle body for opening and closing the first injection hole and the second injection hole. Sitting and leaving can be performed independently. When there are a plurality of first nozzle holes and second nozzle holes, the first nozzle holes and the second nozzle holes can be arranged in the circumferential direction.

The fuel injection device according to claim 2 of the present invention is characterized in that a magnetic material is disposed between the core and the permanent magnet.

According to this, it is preferable that a magnetic body is disposed between the core and the permanent magnet. For example, when the magnetic field (direction of magnetic force) generated in the movable core and the core due to energization of the drive coil is opposite to the magnetic field of the permanent magnet, the magnetic flux flow of the drive coil is relative to the magnetic flux flow. Since it does not act directly on the permanent magnet itself that becomes the magnetic resistance but acts on the magnetic body provided between the permanent magnet and the core, the influence of the magnetic flux of the permanent magnet can be reduced or eliminated. Therefore, the electromagnetic force generated in the drive coil can be used efficiently.

In the fuel injection device according to claim 3 of the present invention, the current direction to the drive coil, and when opening one of the first needle and the second needle opening both the first needle and the second needle It is characterized by reversing when you do.

  According to this, as a method for opening and closing the first nozzle hole and the second nozzle hole, the energization direction of the drive coil is simply reversed between when the first needle is sucked and when the second needle is sucked. Therefore, the variable injection hole can be executed relatively easily.

In the fuel injection device according to claim 4 of the present invention, in the fuel injection device according to any one of claims 1 to 3 , the nozzle needle is one of the first needle and the second needle. It is characterized in that one needle cooperates with the movable core and the other needle cooperates with the core.

  According to this, when the magnetic field generated in the core by energization of the drive coil is opposite to the magnetic field of the magnetizing member, only the nozzle hole corresponding to one needle cooperating with the movable core is opened, and the energization direction is When the magnetic field of the core is reversed and in the same direction as the magnetic field of the magnetizing member, the nozzle hole corresponding to the other needle cooperating with the core can be opened.

The fuel injection device according to claim 5 of the present invention is the fuel injection device according to any one of claims 1 to 3 , wherein the first needle and the second needle are brought into contact with each other, and the first needle is brought into contact. The second needle is moved in the valve opening direction.

  According to this, even if only one of the first needle and the second needle is configured to cooperate with the movable core, and the other needle does not directly cooperate with the core, The first needle and the second needle for opening and closing the first nozzle hole and the second nozzle hole can be moved in the valve opening direction.

In a fuel injection device according to a sixth aspect of the present invention, the fuel injection device according to any one of the first to fifth aspects includes an intake port and two seats seated on and separated from a wall surface of the intake port. Used in an internal combustion engine that includes an intake valve and a combustion chamber that guides air flowing in the intake port from a gap between the intake valve and a wall surface by separating the intake valve, and one of the two intake valves is separated. The first needle is moved in the valve opening direction when the two intake valves are separated, and the first needle and the second needle are moved in the valve opening direction when both of the two intake valves are separated.

  For example, when lean burn combustion is desired in so-called port injection in which fuel is injected into the intake port, a method of generating a relatively strong swirl by stopping one of the two intake valves is conceivable. However, if the intake valve is completely deactivated, the fuel injected by the port is attached to the deactivated intake valve, which causes a problem that the intake valve cannot be completely closed.

On the other hand, in the fuel injection device according to claim 6 , when one of the two intake valves is separated, that is, when the other is seated and rests, the first needle is moved in the valve opening direction. When both intake valves are separated from each other, the first needle and the second needle are moved in the valve opening direction, so that the injection of the second injection hole corresponding to the second needle is performed while the other intake valve is at rest. Is stopped, and both the intake valves are separated from each other, the injection of the first injection hole and the second injection hole corresponding to the first needle and the second needle is allowed. Therefore, when one of the two intake valves is at rest, it is possible to change the injection direction of the injected fuel as a whole or to prohibit the injection in a partial direction.

In the fuel injection device according to claim 7 of the present invention, the fuel injection device according to any one of claims 1 to 5 is used for an internal combustion engine in which fuel is directly supplied into a cylinder, and is stratified. The first needle is moved in the valve opening direction during the combustion operation, and the first needle and the second needle are moved in the valve opening direction during the homogeneous combustion operation.

  According to this, during the stratified combustion operation, the first needle is moved in the valve opening direction to allow only fuel from the first nozzle hole, and during the homogeneous combustion operation, the first needle and the second needle are moved in the valve opening direction. Since fuel injection in both the first injection hole and the second injection hole is allowed, it is possible to inject in one direction during the stratified combustion operation, and the fuel injection can be widely dispersed during the homogeneous combustion operation.

The fuel injection device according to claim 8 of the present invention is characterized by comprising switching means for switching the energization direction to the drive coil.

According to this, since the energization direction to the drive coil is switched by the switching means, the magnetic pole of the core or the movable core can be reversed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments in which a fuel injection device of the present invention is embodied will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a partial cross-sectional view showing the configuration of the fuel injection device of the present embodiment. FIG. 2 is a cross-sectional view showing a fuel path in the fuel injection valve in FIG. FIG. 3 is a schematic cross-sectional view showing the operating state of the fuel injection device of FIG. 1, and is a partial cross-sectional view showing a non-energized state of the drive coil. FIG. 4 is a schematic cross-sectional view showing the operating state of the fuel injection device of FIG. 1, and is a partial cross-sectional view showing a forward direction state of the energization direction to the drive coil. FIG. 5 is a schematic cross-sectional view showing the operating state of the fuel injection device of FIG. 1, and is a partial cross-sectional view showing a reverse state of the energization direction to the drive coil. FIG. 6 is a schematic circuit diagram showing an electrical configuration according to the present embodiment. FIG. 7 is a diagram showing a switching operation of switching means for switching the energization direction to the electromagnetic coil in FIG. In FIG. 1, the drive coil is in a non-energized state.

  The fuel injection device 1 is used for an internal combustion engine (engine), particularly a gasoline engine. As shown in FIG. 1, the fuel injection device 1 includes a fuel injection valve (referred to as an injector) 2 that injects fuel into a combustion chamber (not shown) of an engine, and control means (hereinafter referred to as an injection operation of the injector 2). , Referred to as an ECU) 100.

  More specifically, the injector 2 is attached to an intake pipe such as an intake port of a multi-cylinder (for example, 4-cylinder) gasoline engine (hereinafter referred to as an engine) or each cylinder, and injects fuel into a combustion chamber in the cylinder. To do. In this embodiment, it is assumed that the injector 2 is provided in each cylinder. The fuel pressurized by a fuel pump (not shown) is supplied to the injector 2 via a fuel distribution pipe (not shown). In general, fuel in a fuel tank (not shown) is sucked and discharged to a fuel distribution pipe by a fuel pump (not shown), and the discharged fuel is guided. The discharged fuel is regulated to a predetermined pressure by a pressure regulating device such as a pressure regulator (not shown) and sent to the fuel distribution pipe. When the engine is a direct injection engine, the pressure of the fuel supplied to the combustion chamber of the internal combustion engine is about 2 Mpa or more, and therefore, a predetermined low pressure (for example, 0.2 Mpa) sucked up from the fuel tank by the fuel pump. Is pressurized with a high-pressure pump (not shown), and the pressurized predetermined high-pressure fuel (for example, a predetermined fuel in the range of 2 to 13 MPa) is supplied to the injector 2 through the fuel distribution pipe. . The fuel discharged from the fuel pump and the fuel supplied from the high pressure pump to the fuel distribution pipe are regulated to a predetermined pressure by a pressure regulating device such as a pressure regulator (not shown). Hereinafter, the engine described in this embodiment is a gasoline direct injection engine.

  First, the injector 2 will be described with reference to FIGS. As shown in FIGS. 1 and 2, the injector 2 has a substantially cylindrical shape, receives fuel from one end, and injects fuel from the other end via an internal fuel passage (see FIG. 2). The injector 2 includes a valve portion B that blocks and allows fuel injection and an electromagnetic drive portion S that drives the valve portion B, and injects fuel that has flowed into the fuel passage from the valve portion B into the engine cylinder. Supply.

  As shown in FIG. 1, the valve portion B includes a nozzle body 11 as a valve body and a nozzle needle 30 as a valve member. The nozzle body 11 includes a guide hole 13 that accommodates the nozzle needle 30 so as to be movable in the axial direction, a conical surface 12, and an injection hole portion 20. The guide hole 13 is formed in a substantially round hole shape so that the movable core 50 capable of cooperating with the nozzle needle 30 is movable in the axial direction, and holds the movable core 50 so as to be movable. The conical surface 12 is formed on the inner peripheral surface that is reduced in diameter toward the injection hole 20 side in the fuel flow direction flowing through the internal passage, and is provided so as to be connected to the lower end side of the guide hole 13. A needle 30 can be separated from and seated on the conical surface 12. The conical surface 12 constitutes a valve seat on which the needle 30 can be separated and seated.

  The nozzle hole portion 20 includes a first nozzle hole 21 and a second nozzle hole 22 corresponding to a first needle 31 and a second needle 32, respectively, which divide a nozzle needle described later into two. The first nozzle hole 21 and the second nozzle hole 22 are provided substantially at the center side of the conical surface 12 and are formed so as to penetrate the inside and the outside of the nozzle body 11. A plurality of first nozzle holes 21 and second nozzle holes 22 are formed in the nozzle body 11. In addition, you may comprise so that one may be formed. The first injection hole 21 and the second injection hole 22 are determined in size, direction of the injection hole axis, injection hole arrangement, and the like according to the required fuel spray shape, direction, number, and the like. . Further, the opening area of the nozzle hole portion 22 (hereinafter referred to as the nozzle hole area) defines the flow rate when the valve is opened. The fuel injection amount of the injector 2 is measured by the opening area of the opened nozzle hole, the lift amount of the needle corresponding to the nozzle hole, and the valve opening period.

  In addition, the first nozzle hole 21 and the second nozzle hole 22 described in the present embodiment are assumed to be plural (for example, ten each). The first nozzle holes 21 and the second nozzle holes 22 are respectively arranged in the circumferential direction. In FIG. 1 and FIG. 2, two are shown for convenience of drawing.

  The nozzle needle 30 has a first needle 31 and a second needle 32. The first needle 31 and the second needle 32 are divided in the radial direction, and are arranged inside and outside so as to be movable in the axial direction. The first needle 31 has a second needle 32 disposed therein so as to be movable in the axial direction. The first needle 31 and the second needle 32 are independently movable in the axial direction, and open and close the first injection hole 21 and the second injection hole 22 by being separated and seated on the conical surface 12. The first needle 31 may be disposed inside the second needle 32 so as to be movable in the axial direction. The contact portion of the first needle 31 and the contact portion of the second needle 32 are in contact with and away from the conical surface 12. Even if these contact portions are conical surfaces 35 and 36 that contact and separate from the conical surface 12, the first needle 31 formed in a substantially cylindrical shape, the second circular ridge line portion 33 of the needle 32, Any of 35 may be sufficient. In the following embodiment, the contact portions that are seated and separated from the conical surface 12 are circular ridge line portions 33 and 35.

  As shown in FIG. 1, the electromagnetic drive unit S includes a movable core 50, a core 60 that faces the movable core 50 in the axial direction, a coil 70, and a magnetic member 70. The movable core 50 is a stepped substantially cylindrical body made of a magnetic material such as magnetic stainless steel. The movable core 50 is fixed to the first needle 31, and the movable core 50 and the first needle 31 cooperate. Note that the movable core 50 and the first needle 31 are not limited to those formed integrally by welding or the like as shown in FIG. 1, but may be formed integrally.

  The core 60 is a substantially cylindrical body made of a magnetic material such as magnetic stainless steel. The core 60 is fixed to the second needle 32, and the core 60 and the second needle 32 cooperate. The core 60 is accommodated in the inner circumferences 15a and 15b of the cylindrical member 15 so as to be movable in the axial direction. The cylindrical member 15 is formed of a pipe material made of a magnetic material or the like, and has a stepped portion made of stepped inner peripheries 15a and 15b. The stepped portion restricts the axial movement of the core 60. More specifically, the cylindrical member 15 has an inner circumference 15b larger than the inner circumference 15a. The outer periphery on the lower end side of the core 60 is movably held on the inner periphery 15a. Further, the annular portions 62 and 63 formed on the outer periphery on the upper end side of the core 60 are movably held on the inner periphery 15b, and the downward movement of the annular portion 62 is related to the step portion. Limited when stopped.

  The coil 70 is wound around the outer periphery of a resin spool (not shown) in a predetermined direction. The ends of the coil 70 are drawn out as two terminals (not shown). The terminal supplies current from an external power source or the like to the coil 70. The spool is attached to the outer periphery of the cylindrical member 15. Here, the coil 70, the spool, and the terminal constitute a drive coil. In addition, the resin mold 19 is arrange | positioned in the outer peripheral side of drive coils, such as the coil 70, and the connector part (not shown) which accommodates a terminal is provided.

  The magnetized member (hereinafter referred to as a permanent magnet) 80 is a magnetized magnetic material such as a ferrite magnet, a rare earth magnet, or an alnico magnet. As shown in FIG. 1, the permanent magnet 80 is formed in a substantially cylindrical body and is magnetized so as to generate a predetermined magnetic force. The permanent magnet 80 is disposed on the side of the core 60 opposite to the movable core 50 so as to face the core 60 in the axial direction.

  The magnetic pole of the permanent magnet 80 is not limited to a magnetic pole arrangement in which the end surface on the core 60 side is the S pole and the end surface on the anti-core 60 side is the N pole, but the end surface on the core 60 side is the N pole and the end surface on the anti-core 60 side is The magnetic pole arrangement may be the S pole. The end face on the core 60 side is the N pole and the end face on the anti-core 60 side is the S pole instead of the former in which the end face on the core 60 side is the S pole and the end face on the anti-core 60 side is the N pole. In the latter configuration in which the magnetic poles are arranged, the energization direction to the drive coil by the ECU 100 in the latter is reversed so that the relationship between the magnetic force by the permanent magnet 80 and the electromagnetic force by the drive coil is the same as the former.

  In the magnetic pole arrangement of the permanent magnet 80 described in the following embodiment, the end surface on the core 60 side is the S pole and the end surface on the anti-core 60 side is the N pole (see FIG. 3).

  Between the lower end surface of the core 60 and the spring seat 50s of the movable core 50, a spring 59 as an urging means is disposed. The spring 59 urges the operating core 50 toward the nozzle hole 20 side of the nozzle body 11.

  In the present embodiment, it is preferable to provide the magnetic body 17 between the core 60 and the permanent magnet 80 as shown in FIG. The magnetic body 19 is not magnetized by magnetization like a permanent magnet, but uses a magnetic material such as a soft magnetic material that is relatively easily magnetized and has little residual magnetism. For example, depending on the energization direction of the drive coil, the magnetic field (direction of magnetic force) generated in the movable core 50 and the core 60 and the magnetic field of the permanent magnet 80 may be opposite to each other. In this case, by providing the magnetic body 17, the magnetic flux flow of the drive coil does not directly act on the permanent magnet 80 itself that becomes a magnetic resistance against the magnetic flux flow, and between the permanent magnet 80 and the core 60. It acts on the magnetic body 17 provided in the. Therefore, since the influence of the magnetic flux of the permanent magnet 80 can be reduced or eliminated, the electromagnetic force generated in the drive coil can be used efficiently.

  When the above-described magnetic body 17 is disposed between the permanent magnet 80 and the core 60, the magnetic body 17 is replaced with the permanent magnet 80 side direction of the core 60 (FIG. 1) instead of the permanent magnet 80 magnetized by magnetization. Then, it has a function of regulating the amount of movement in the upper axial direction. Note that the lower end surface 17 a of the magnetic body 17 is not limited to a substantially planar shape that makes contact with the core 60 almost entirely, but has a stepped shape having a substantially annular step (not shown) so as to make contact with a part of the core 60. It may be a flat one. In the configuration in which the shape of the lower end surface 17a of the magnetic body 17 is in contact with a part of the core 60, even if the core 60 is once connected by the magnetic force of the magnetic body 17, the magnetism of the core 60 is maintained. When reversed, it is easy to release the connection of the core 60 from the magnetic body 17.

  Furthermore, in the present embodiment, it is preferable that the core 60 is configured to include a biasing means (hereinafter referred to as a spring) 69 that biases the core 60 toward the nozzle hole 20 side of the nozzle body 11. Specifically, as shown in FIG. 1, the spring 69 is sandwiched between a bush (not shown) fixed in the internal fuel passage on one end side of the injector 2 and the core 60. Is biased toward the step portion with a predetermined biasing force.

  As shown in FIG. 2, the internal fuel passage of the injector 2 has an inner circumference of the permanent magnet 80, an inner circumference of the magnetic body 17, and an inner circumference 61 of the core 60 from the upstream to the downstream of the fuel flow. An axial passage 32 a of the second needle 32, a radial passage 32 k of the second needle 32, a radial passage 50 k of the movable core 50, a fuel passage formed by the guide hole 13 and the first needle 31. These are configured in order, and these constitute a fuel flow path toward the nozzle hole portion 20.

  The ECU 100 is configured as a microcomputer having a known configuration in which a read only memory (ROM), a random access memory (RAM), a microprocessor (CPU), an input port, and an output port (not shown) are connected to each other via a bidirectional bus. Yes. The ECU 100 controls the energization period of the injector 2 by starting and stopping energization of the terminal of the injector 2 using a power source such as a battery. The signals of various sensors (not shown) for detecting the operating state of the engine, such as the engine speed, intake pipe pressure (or intake air amount), cooling water temperature, etc., are read, and the injector 2 is operated according to various programs (not shown) for the engine. The operation of the electromagnetic drive unit B is controlled (see FIG. 1).

  The electrical configuration of the fuel injection device 1 according to the present embodiment will be described with reference to FIGS. The ECU 100 supplies current in a predetermined direction to two terminals of the injector 2 (specifically, a drive coil) based on signals from various sensors that detect the operating state of the engine. As shown in FIG. 6, the ECU 100 includes a control unit 100a and an energization direction switching circuit 100b. Since the control unit 100a is the microcomputer described above, description thereof is omitted.

  The energization direction switching circuit 100b has a configuration in which an H bridge circuit is assembled by four switching elements (hereinafter referred to as transistors) TR1, TR2, TR3, and TR4 with a driving coil (specifically, a coil 70) of the injector 2 as a center. ing. One end of the coil 70 wound in a predetermined direction is connected to an intermediate point between the first transistor TR1 on the battery power supply voltage Vb side and the second transistor TR1 on the ground side, which are connected in series. The other end side of the coil 70 is connected in series to an intermediate point between the third transistor TR3 on the battery power supply voltage Vb side and the fourth transistor TR4 on the ground side. In the energization direction switching circuit 100b, as shown in FIG. 7, only the energization of the base terminal of the first transistor TR1 and the base terminal of the fourth transistor TR4 is turned ON, whereby the direction of the current flowing through the coil 70 is changed. It becomes a predetermined direction. Further, by turning ON only the power supply to the base terminal of the second transistor TR2 and the base terminal of the third transistor TR3, the direction of the current flowing through the coil 70 is reversed from the predetermined direction and becomes the anti-predetermined direction. . In the following description of the present embodiment, the predetermined current direction is referred to as a forward direction, and the anti-predetermined current direction is referred to as a reverse direction.

  Here, ECU 100 has switching means for switching the energization direction to the drive coil of injector 2 as one of means for controlling the system. This switching means switches the direction of current flowing through the coil 70 from the normal direction to the reverse direction or from the reverse direction to the normal direction by switching the energization direction.

  The operation of the fuel injection device 1 having the above-described configuration, particularly the operation of the injector 2 will be described below with reference to FIGS. 3 to 5 schematically show the direction of the current of the battery power supply or the like supplied from the ECU 100 to the drive coil (specifically, the coil 70) by the direction of the battery. First, the non-energized state of the drive coil (see FIG. 3), the energized direction of the drive coil in the forward direction (see FIG. 4), and the energized direction of the drive coil in the reverse direction (see FIG. 5) will be described. . 3 to 5, the arrow direction indicates the direction of the magnetic field (magnetic flux flow).

  (1) When the drive coil (specifically, the coil 70) shown in FIG. 5 is in a non-energized state, the magnetic flux of the permanent magnet 80 forms a closed circuit through the magnetic body 17. Since the magnetic force of the permanent magnet 80 does not reach the core 60 through the magnetic body 17, no attractive force that attracts the core 60 to the permanent magnet 80 is generated. On the other hand, since the drive coil is in a non-energized state and no electromagnetic force is generated in the coil 70, the first needle 31 and the second needle 32 are moved to the conical surface (valve seat) 12 by the spring 59 and the spring 69, respectively. It is pressed. As a result, the injector 2 is closed and fuel is not injected from the first injection hole 31 and the second injection hole 32.

  Since the core 60 is biased toward the step portion of the cylindrical member 15 by the biasing force of the spring 69, the core 60 is locked to the step portion by this biasing force. For this reason, the movement position of the core 60 is restricted to the lower limit position of the axial movement (hereinafter referred to as a position restricted to a low lift state).

  (2) When the energization direction to the drive coil shown in FIG. 4 is a positive direction, the coil 70 is energized, and an electromagnetic force is generated in the coil 70. Furthermore, since the energizing direction of the drive coil is set to the positive direction, the magnetic pole on the end surface of the permanent magnet 80 side of the core 60 becomes the S pole and repels the N pole of the magnetic pole on the end surface of the permanent magnet 23 on the core 23 side. It becomes a relationship. As a result, the core 60 is maintained in a position that restricts the low lift state.

  On the other hand, the core 60 magnetized by the coil 70 attracts the movable core 50 and separates the first needle 31 from the conical surface (valve seat) 12 so that fuel injection from the first injection hole 21 is allowed. At this time, the lift amount H of the first needle 31 fixed to the movable core 50 by the core 60 is limited to a low lift state (H = HD1). The second needle 32 is pressed against the conical surface (valve seat) 12 so that fuel injection from the second injection hole 22 is blocked.

  At this time, the electromagnetic force of the coil 70 repelling against the magnetic force (hereinafter, referred to as steady magnetic force) by the permanent magnet 80 is acting on the core 60. As shown in FIG. 4, the electromagnetic force of the coil 70, that is, the flow of magnetic flux, does not directly act on the permanent magnet 80 itself but acts on the magnetic body 17. As a result, the flow of magnetic flux in the coil 70 is not hindered by the flow of magnetic flux in the permanent magnet 80 that becomes a magnetic resistance to the flow of magnetic flux. Therefore, compared with an injector having a configuration in which the permanent magnet 80 and the core 60 are directly opposed to each other in the axial direction without arranging the magnetic body 17 between the permanent magnet 80 and the core 60, the electromagnetic force generated in the coil 70 is reduced. Even if it is about half, it is possible to obtain the same or higher operating force.

  Here, the magnetic circuit formed by the magnetic force of the permanent magnet 80 and the magnetic circuit formed by the electromagnetic force of the coil 70 are respectively closed circuited through the magnetic body 17 sandwiched between the permanent magnet 80 and the core 60. Form.

  (3) In the state where the energization direction to the drive coil shown in FIG. 5 is in the reverse direction, the energization direction to the drive coil can be switched from the normal direction to the reverse direction, so the direction of the magnetic field due to the electromagnetic force generated in the coil 70 is The direction of the magnetic field always generated in the permanent magnet 80 is the same. At this time, the magnetic force biased by the electromagnetic force of the coil 70 acts on the core 60 in addition to the stationary magnetic force generated by the permanent magnet 80. As a result, the core 60 is attracted to the magnetic body 17 side and locked to the lower end surface 17a of the magnetic body 17. Therefore, the movement position of the core 60 is restricted to the upper limit position of the axial movement (hereinafter referred to as a position that is restricted to a high lift state).

  On the other hand, the core 60 magnetized by the coil 70 and the permanent magnet 80 attracts the movable core 50 to bring the lift amount H of the first needle 31 into a high lift state (H = HD2). Further, as the core 60 moves from the lower limit position to the upper limit position, the second needle 32 fixed to the core 60 moves away from the conical surface (valve seat) 12 and fuel injection is permitted from the second injection hole 22. . At this time, the lift amount H of the second needle 32 is limited to a high lift state (H = HD2) (HD2> HD1). As a result, fuel injection from the first injection hole 31 and the second injection hole 32 is allowed.

  When the energization direction of the drive coil is set to the forward direction state or the reverse direction state, the current flowing in the coil 70 according to the winding direction generates a magnetic field that acts in one axial direction. When the energization direction to the drive coil is switched from the normal direction state to the reverse direction state, the direction of the magnetic field applied to the core 60, that is, the direction of the magnetic force is reversed. The reversal of the magnetic force can also act to displace the core 60 in the axial direction.

  According to the explanation of the operation of the injector 2 described above, when the injector 2 is not energized, the first needle 31 and the second needle 32 are seated on the conical surface (valve seat) 12 (hereinafter referred to as valve closing), and the first injection is performed. Fuel injection from the hole 21 and the second injection hole 22 is blocked. Next, when the energization direction of the drive coil of the injector 2 is positive, the magnetic field acting on the core 60 by the electromagnetic force of the coil 70 (the direction of the magnetic force) and the magnetic field of the permanent magnet 80 are reversed and repelled. Because of this relationship, the movement position of the core 60 is restricted to a position (lower limit position) that restricts the low lift state. Therefore, the movable core 50 is attracted to the core 60 by the electromagnetic force of the coil 70, and only the first needle 31 cooperating with the movable core 50 is separated from the conical surface (valve seat) 12 (hereinafter referred to as valve opening). Call). As a result, only the injection from the first injection hole 21 is allowed when the energization direction is the positive direction. On the other hand, the energization direction to the drive coil is switched, and in the reverse state, the magnetic field acting on the core 60 (the direction of the magnetic force) and the magnetic field of the permanent magnet 80 are in the same direction. The movement position of the core 60 is regulated at a position (upper limit position) where the movement position is limited to a high lift state. Therefore, the second needle 32 cooperating with the core 60 is also opened. As a result, injection from both the first nozzle hole 21 and the second nozzle hole 22 is allowed when the energization direction is the reverse direction.

  Next, the overall operation of the fuel injection device 1 will be described. ECU 100 detects the operating state of the engine from signals from various sensors. Based on the detected engine operating state, the ECU 100 determines the spray shape, characteristics, and the like for fuel injection from the injection hole portion 20 (specifically, the first injection hole 21 and the second injection hole 22) suitable for the operation state. Determine the injection pattern. When the ECU 100 determines that the injection pattern suitable for the operating state is that the injection is made only from the first injection hole 21, the ECU 100 sets the first and fourth transistors TR1 and TR4 of the energization direction switching circuit 100b. Turn on and set the energization direction to the drive coil to the positive direction. As a result, the movement position of the core 60 is restricted to a position that restricts the low lift state, only the first needle 31 is opened, and the lift amount H of the first needle 31 is controlled to H = HD1. On the other hand, when the ECU 100 determines that the injection pattern suitable for the operating state is to be injected from the first injection hole 21 and the second injection hole 22, the ECU 100 determines the second and second energization direction switching circuits 100b. 3 transistors TR2 and TR3 are turned on, and the energization direction to the drive coil is reversed. As a result, the movement position of the core 60 is restricted to a position that restricts the lifted state to the high lift state, both the first needle 31 and the second needle 32 are opened, and the lift amount H of the first needle 31 and the second needle 32 is increased. Is controlled to H = HD2.

  Note that, by changing the lift amount, for example, the opening area for fuel injection changes, so the injection amount per unit time can be changed. As a result, the injection amount injected from the injector 2 is adjusted by adjusting the energization period to the coil 70. Furthermore, even if the energization period to the coil 70 is the same, the injection amount can be changed by setting the lift amount H to either H = HD1 or H = HD2.

  In this way, the polarity (magnetic pole) of the core 80 can be reversed by switching the energization direction to the drive coil by the ECU 100 (specifically, the energization direction switching circuit 100b). When the polarity of the core 80 is reversed, either the stationary magnetic force of the permanent magnet 80 and the magnetic force biased by the electromagnetic force of the coil 70 or the electromagnetic force of the coil 31 repelling the stationary magnetic force of the permanent magnet 80 acts on the core 60. . When a biased magnetic force acts on the core 60, the upper limit position (which is restricted to a high lift state) is attracted to the permanent magnet 80 side (specifically, the lower end surface 17a of the magnetic body 17) and can move upward in the axial direction of the core 60. To be controlled). On the other hand, when the electromagnetic force of the coil 70 repelling the permanent magnet 80 acts on the core 60, the core 70 is pressed against the anti-permanent magnet 80 side, that is, the conical surface (valve seat) 12 side, and the core 60 is moved downward in the axial direction. It is restricted to the lower limit position where it can move to (the position that restricts to the low lift state). In addition, the electromagnetic force of the drive coil can act on the core 60 and the movable core 50. In both the low lift state (see FIG. 4) and the high lift state (see FIG. 5), the coil 70 is energized, and electromagnetic force is generated in the coil 70. The movable core 25 is attracted by this electromagnetic force.

  Here, the permanent magnet 80 and the energization direction switching circuit 100b constitute lift amount changing means for inverting the magnetic pole of the core 60 or the movable core and displacing the core 60 or the movable core 50. By the displacement operation of the core 60, the displacement amount of the movable core 50, that is, the lift amount H of the first needle 31 can be changed from HD2 to HD1 or from HD1 to HD2. Further, the lift amount H of the second needle 32 can be changed to HD2 by the displacement of the core 60 itself (specifically, to a position where it is restricted to the high lift state).

  Here, the core 60, the permanent magnet 80, and the energization direction switching circuit 100b constitute lift variable means for making the lift amounts of the first needle 31 and the second needle 32 variable. By the lift variable means 60, 80, 100b, the lift amount of the injector 2 is switched between the low lift state (H = HD1) and the high lift state (H = HD2).

  Next, the operation and effect of the present embodiment will be described. (1) The first injection hole 21 and the second injection hole 22 provided in the nozzle body 11 are the first needle 31 and the first needle 31 constituting the nozzle needle 30, respectively. Opened and closed by the second needle 32. Further, as a driving means for driving the first needle 31 and the second needle 32 in the axial direction, the movable core 50, the core 60 made of a magnetic material facing the movable core in the axial direction, and the movable core 50 and the core 60 are provided. And a permanent magnet 80 that can be attracted and repelled on the side of the movable core 50 in accordance with the magnetic pole direction of the magnetic force. Thereby, the 1st needle 31 and the 2nd needle 32 are driven by the simple composition by electromagnetic drive parts S, such as permanent magnet 80 and a drive coil, and the nozzle hole area of the 1st nozzle hole 21 and the 2nd nozzle hole 22 is made independent. Can be switched. Therefore, it is possible to simplify the configuration having the function of switching the injection pattern such as the characteristics and shape of the spray with one injector 2.

  (2) The permanent magnet 80 is not limited to a magnet that is always magnetized, such as a permanent magnet, but is a coil that is different from the drive coil (specifically, the coil 70). Any member may be used as long as it is magnetized so as to generate a predetermined magnetic force.

  In the case of a member that generates a magnetic force by current supply (hereinafter referred to as a drive member) such as the above-described coil, the power consumption amount for driving the drive member is not limited to the power consumption amount for driving the drive coil. Necessary. On the other hand, since the permanent magnet 80 is used in the present embodiment, it is possible to reduce the power consumption for driving the fuel injection device 1 having a function of switching the injection pattern such as spray characteristics and shape.

  (3) In the present embodiment, it is preferable that the magnetic body 17 is disposed between the core 60 and the permanent magnet 80. When the magnetic field (direction of magnetic force) generated in the movable core 50 and the core 60 and the magnetic field of the permanent magnet 80 are opposite to each other due to energization of the drive coil (specifically, the energization direction is a positive direction) The magnetic flux flow does not act directly on the permanent magnet 80 itself, which becomes a magnetic resistance against the magnetic flux flow, but acts on the magnetic body 17, so that the influence of the magnetic flux of the permanent magnet 80 can be reduced or eliminated. Therefore, the electromagnetic force generated in the drive coil can be used efficiently.

  (4) In the present embodiment, the nozzle needle 30 includes a first needle 31 and a second needle 32, and the first needle 31 and the second needle 32 are internally and externally divided so as to be radially divided. Is arranged. As a result, the first needle 31 and the second needle 32 are doubly arranged inside and outside, so that the first needle 31 and the second needle 32 open and close the first injection hole 31 and the second injection hole 32. The nozzle body 11 can be seated on and separated from the conical surface (valve seat) 12 independently. Further, when there are a plurality of the first nozzle holes 21 and the second nozzle holes 22, the degree of freedom in designing the first nozzle holes 21 and the second nozzle holes 22 in the circumferential direction can be increased (for example, described later). (Refer to the fourth to seventh embodiments).

  (5) In this embodiment, the energization direction to the drive coil is reversed between when the first needle 31 is sucked through the movable core 50 and when the second needle 32 is sucked through the core 60. I try to let them. Thereby, as a method for opening and closing the first nozzle hole 21 and the second nozzle hole 22, the energizing direction of the drive coil is reversed between when the first needle 31 is sucked and when the second needle 32 is sucked. Therefore, the variable injection hole can be executed relatively easily.

  In the present embodiment, the first needle 31 cooperates with the movable core 50 and the second needle 32 cooperates with the core 60. However, the configuration of the nozzle needle 30 is not limited to this configuration. Any one of the needle 31 and the second needle 32 may cooperate with the movable core 50, and the other needle may cooperate with the core 60. Even in such a configuration, when the magnetic field generated in the core 60 by energization of the drive coil is opposite to the magnetic field of the permanent magnet 80, only the injection hole corresponding to one needle cooperating with the movable core 50 is used. When the energizing direction is reversed and the magnetic field of the core 60 becomes the same direction as the magnetic field of the magnetizing member, the nozzle hole corresponding to the other needle cooperating with the core 60 can be opened.

(Second Embodiment)
A second embodiment will be described with reference to FIG. In the following description, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and description thereof will not be repeated. FIG. 8 is a partial cross-sectional view showing the configuration of the fuel injection device of the present embodiment. In FIG. 8, the core 60 is restricted to a position where it is restricted to a low lift state.

  In the second embodiment, instead of the core 60 described in the first embodiment being fixed and cooperating with the second needle 32, the movable core 150 is replaced with the second needle as shown in FIG. It shall be fixed to 132 and cooperate. More specifically, the movable core 150 does not accommodate the second needle so as to be movable therein, and fixes the second needle 32 to the inner periphery 151 by bonding or the like.

  As shown in FIG. 8, the second needle 132 is formed in a substantially cylindrical body with a step, and the outer periphery on the lower end side is formed larger than the outer periphery on the upper end side. The first needle 131 is formed in a substantially cylindrical shape, and the inner periphery thereof is formed in a stepped inner periphery so as to hold the second needle 132 movably in the axial direction. The stepped portion 132s formed on the outer peripheral side of the second needle 132 and the stepped portion 131s formed on the inner peripheral side of the first needle 131 are disposed so as to be latchable with each other.

  Further, the first needle 131 is not directly fixed to the movable core 150, and is disposed away from the movable core 150 by a predetermined gap in the axial direction. Further, as shown in FIG. 8, the movable core 150 and the core 60 are arranged apart from each other by a gap δ2 in the axial direction. The stepped portion 132s and the stepped portion 131s are arranged apart from each other in the axial direction by a gap δ3. The relationship between the clearances δ1 and δ2 and the lift amount HD1 in the low lift state is set to HD1 = δ2, and the relationship between the clearance δ3 and the low lift amount HD1 and the high lift amount HD2 = δ1 + δ2 is set to HD2 ≧ δ3 ≧ HD1. Yes. The gap δ1 is an air gap between the core 60 and the magnetic body 17 (a movable amount of the core 60).

  The operation of the injector 2 in the fuel injection device 1 having the above-described configuration will be described below. (1) In a non-energized state of the drive coil, the first needle 131 and the second needle 132 are closed, and fuel injection from the first injection hole 21 and the second injection hole 22 is blocked. At this time, the core 60 is restricted to a position (lower limit position) where the core 60 is restricted to a low lift state.

  (2) When the energization direction of the drive coil is in the positive direction, the magnetic field acting on the core 60 by the electromagnetic force of the coil 70 (the direction of the magnetic force) and the magnetic field of the permanent magnet 80 are in opposite directions and repel each other. Therefore, the core 60 remains restricted at a position that restricts the low lift state. Therefore, the movable core 150 is attracted to the core 60 by the electromagnetic force of the coil 70, and only the second needle 132 that cooperates with the movable core 150 opens. As a result, only the injection from the second injection hole 22 is allowed when the energization direction is the positive direction. At this time, the lift amount H of the second needle 132 is limited to the low lift state (H = HD1).

  (3) The energization direction to the drive coil is switched, and in the reverse direction, the magnetic field acting on the core 60 and the magnetic field of the permanent magnet 80 are in the same direction, so the core 60 is attracted to the permanent magnet 80 side, The core 60 is regulated at a position (upper limit position) where the core 60 is restricted to a high lift state. On the other hand, since the movable core 150 is attracted to the core 60, the lift amount H of the second needle 132 is displaced from the low lift state (H = HD1) and is limited in the high lift state (H = HD2). Become. At this time, since the gap δ3 ≦ HD2 is set, the stepped portion 132s of the second needle 132 abuts on the stepped portion 131s of the first needle 131, and the first needle 131 is locked to the second needle 132. When locked to the second needle 132, the first needle 131 is opened. As a result, fuel injection from both the first injection hole 21 and the second injection hole 22 is allowed.

  According to the present embodiment described above, the second needle 132 cooperates with the movable core 150, and the second needle 132 and the first needle 131 are brought into contact with and locked according to the movement position of the core 60. Therefore, even when the first needle 131 and the second needle 132 are not in direct cooperation with the core 60, the first nozzle hole 21 and the second nozzle hole 22 are opened and closed. The first needle 131 and the second needle 132 can be moved in the valve opening direction. Therefore, even if it is the above structures, the effect similar to 1st Embodiment can be acquired. The first needle may be biased in the valve closing direction by an elastic member.

(Third embodiment)
In the third embodiment, instead of the relationship in which the first needle 31 and the second needle 32 described in the first embodiment can move in the axial direction, as shown in FIG. The first needle 231 is housed inside and the relative movement of the first needle and the second needle is limited within a predetermined gap δ3. FIG. 9 is a partial cross-sectional view showing the configuration of the fuel injection device of the present embodiment.

  The movable core 250 is fixed to the first needle 231 and the movable core 250 and the first needle 231 cooperate. A cylindrical bushing 58 is fixed to the inner periphery of the movable core 250, and a spring 59 is interposed between the upper end surface side of the bushing 58 and the core 60. A spring 39 is sandwiched between the lower end surface of the bush 58 and the upper end surface of the second needle 232. The spring 39 urges the second needle 232 toward the conical surface (valve seat) 12 side.

  As shown in FIG. 9, the second needle 232 is formed in a stepped substantially cylindrical body, and the outer periphery on the upper end side is formed larger than the outer periphery on the lower end side. The first needle 231 is formed in a substantially cylindrical shape, and the inner periphery thereof is formed in a stepped inner periphery so as to hold the second needle 232 so as to be movable in the axial direction within the gap δ3. Yes. The step portion 232 s formed on the outer peripheral side of the second needle 232 and the step portion 231 s formed on the inner peripheral side of the first needle 231 are disposed so as to be locked with each other.

  Further, as shown in FIG. 9, the movable core 250 and the core 60 are arranged apart from each other by a gap δ4 in the axial direction. The step portion 232s and the step portion 231s are arranged apart from each other by a gap δ5 in the axial direction. The relationship between the gaps δ4 and δ5 and the lift amounts HD1 and HD2 in the low lift state is set to HD1 = δ4 and HD2 ≧ δ5 ≧ HD1, respectively.

  The operation of the injector 2 in the fuel injection device 1 having the above-described configuration will be described below. (1) In the non-energized state of the drive coil, the first needle 231 and the second needle 232 are closed, and fuel injection from the first injection hole 21 and the second injection hole 22 is blocked. At this time, the core 60 is restricted to a position (lower limit position) where the core 60 is restricted to a low lift state.

  (2) When the energization direction of the drive coil is in the positive direction, the magnetic field acting on the core 60 by the electromagnetic force of the coil 70 (the direction of the magnetic force) and the magnetic field of the permanent magnet 80 are in opposite directions and repel each other. Therefore, the core 60 remains restricted at a position that restricts the low lift state. Therefore, the movable core 250 is attracted to the core 60 by the electromagnetic force of the coil 70, and only the first needle 231 cooperating with the movable core 250 is opened. As a result, only the injection from the first injection hole 21 is allowed when the energization direction is the positive direction. At this time, the lift amount H of the first needle 132 is limited to a low lift state (H = HD1).

  (3) The energization direction to the drive coil is switched, and in the reverse direction, the magnetic field acting on the core 60 and the magnetic field of the permanent magnet 80 are in the same direction, so the core 60 is attracted to the permanent magnet 80 side, The core 60 is regulated at a position (upper limit position) where the core 60 is restricted to a high lift state. On the other hand, since the movable core 250 is attracted to the core 60, the lift amount H of the first needle 232 is displaced from the low lift state (H = HD1) and is limited in the high lift state (H = HD2). Become. At this time, since the clearance δ5 ≦ HD2 is set, the step portion 231s of the first needle 231 contacts the step portion 132s of the second needle 232, and the second needle 232 is locked to the first needle 231. When locked to the first needle 231, the second needle 132 is opened. As a result, fuel injection from both the first injection hole 21 and the second injection hole 22 is allowed.

  According to the present embodiment described above, the first needle 231 cooperates with the movable core 250, and the first needle 231 and the second needle 232 are brought into contact with each other and locked according to the moving position of the core 60. Therefore, even when the first needle 231 and the second needle 232 are not in direct cooperation with the core 60, the first nozzle hole 21 and the second nozzle hole 22 are opened and closed. The first needle 231 and the second needle 232 can be moved in the valve opening direction. Therefore, even if it is the above structures, the effect similar to 1st Embodiment can be acquired.

(Fourth embodiment)
Hereinafter, other embodiments such as the arrangement of the first nozzle holes 21 and the second nozzle holes 22 described in the first embodiment will be described with reference to FIGS. 10 and 11. In 4th Embodiment, the 1st nozzle hole 21 and the 2nd nozzle hole 22 are arrange | positioned as shown to Fig.11 (a). FIG. 10 is a schematic view showing an example of the spray shape of the injected fuel from the valve portion according to the present embodiment, and FIG. FIG. 10B is a perspective view showing the shape of the tip side of the spray. FIG. 11 is a schematic view showing another example of the spray shape of the injected fuel from the valve portion according to the present embodiment, and FIG. FIG. 11B is a perspective view showing the shape of the tip side of the spray. In FIGS. 10 and 11, F1 and F2 indicate the fuel injected from the first injection hole 21 and the second injection hole 22, that is, the fuel jet flow, respectively.

  As shown to Fig.11 (a), the 1st nozzle hole 21 and the 2nd nozzle hole 22 have two or more, respectively, and are arrange | positioned in the circumferential direction. The first nozzle hole 21 and the second nozzle hole 22 are provided on a double circle. In addition, the 1st nozzle hole 21 comprises an outer peripheral side nozzle hole group here, and the 2nd nozzle hole 22 comprises the inner peripheral side nozzle hole group here.

  Each of the first nozzle hole 21 and the second nozzle hole 22 has a predetermined inclination angle θ1, θ2 with respect to the central axis (not shown) of the injector 2 (specifically, the valve portion B). And inclined toward the direction away from the central axis. The inclination angle θ1 of the first injection hole 21 is smaller than the inclination angle θ2 of the second injection hole 22 (θ1 <θ2), and the injection hole axes intersect each other.

  The degree of intersection is substantially perpendicular to the fuel jets F1 and F2 at the collision point where the fuels (fuel jets) F1 and F2 injected from the first injection hole 21 and the second injection hole 22 collide. In addition, it is preferable that the fuel jets F1 and F2 are joined so that a thin liquid film fuel jet F3 is spread. In addition, as shown in FIG.11 (b), a collision point is comparatively directly under the downstream of the valve part B (the 1st injection hole 21 and the 2nd injection hole 22) compared with the spray arrival distance (penetration) of a spray. It is formed nearby.

  In addition, the nozzle hole adjacent to the radial direction in Fig.11 (a) is made into a group, and another group of nozzle holes formed in an annular shape is arranged in the circumferential direction.

  The operation of the injector 2 in the fuel injection device 1 having the above-described configuration will be described below.

  (1) When the energization direction to the drive coil of the injector 2 is in the positive direction, only the first needle 31 opens and only injection from the first injection hole 21 is allowed (see FIG. 10A). . Since the inclination angle θ2 of the first injection hole 21 is relatively small (θ1 <θ2), the spray (jet stream F1 group) formed by being injected from the first injection hole 21, that is, the outer peripheral injection hole group, is relatively wide. And a substantially hollow cone-shaped spray (see FIG. 10B). At this time, the lift amount H of the first needle 31 is in a low lift state (H = HD1).

  (2) The energization direction to the drive coil is switched, and in the reverse direction, the second needle 32 is also opened, and injection from both the first injection hole 21 and the second injection hole 22 is allowed (FIG. 11 (a)). The spray (jet stream F3 group) formed by joining the jets F1 and F2 injected from the first nozzle hole 21 and the second nozzle hole 22 is a substantially hollow conical spray (FIG. b)). Since the spray (jet F3 group) is formed from a thin liquid film-like fuel jet F3, the contact area with air can be increased. At this time, the lift amount H of the first needle 31 and the second needle 32 is in a high lift state (H = HD2).

  According to the present embodiment described above, when the energization direction of the drive coil is in the positive direction, the fuel F1 is injected from the first injection hole 21, and the spray shape formed by the fuel jet F1 is relatively small. It can be formed into a compact spray shape such as a substantially hollow conical shape having a spread. In the reverse direction, the energization direction to the drive coil is switched, and fuels F1 and F2 are injected from the first injection hole 21 and the second injection hole 22, and the spray shape formed by the combined jet flow F3 is relatively It can be formed into a widely dispersed spray shape such as a substantially hollow cone having a large spread.

  In an engine operation state, for example, in a low load state (specifically, relatively low load side and relatively low speed side) such as idle operation, fuel efficiency is emphasized. In the state of the high load side or the relatively high speed side, since the output is emphasized, there is a case where homogeneous combustion is performed. In this case, by switching the energization direction to the drive coil, during stratified combustion operation, fuel is injected only from the first injection hole 21 and has a relatively small extent toward the cavity of the top of the engine, for example, the piston. A spray can be formed. During the homogeneous combustion operation, fuel can be injected from both the first nozzle hole 21 and the second nozzle hole 22 to form a spray having a relatively large spread in the cylinder (combustion chamber).

(Fifth embodiment)
In the fifth embodiment, in the first nozzle hole 21 and the second nozzle hole 22 described in the fourth embodiment, fuel (fuel jet) F1 injected from the first nozzle hole 21 and the second nozzle hole 22; As shown in FIG. 13B, the first nozzle holes 21 and the second nozzle holes 22 are arranged in a so-called staggered manner so that F2 does not collide. FIG. 12 is a schematic view showing an example of the spray shape of the injected fuel from the valve portion according to the present embodiment, and FIG. FIG. 12B is a perspective view showing the shape of the tip side of the spray. FIG. 13 is a schematic view showing another example of the sprayed shape of the injected fuel from the valve portion according to the present embodiment, and FIG. 13A is a first nozzle hole and a second nozzle hole that the valve portion has. FIG. 13B is a perspective view showing the shape of the tip side of the spray.

  As shown to Fig.13 (a), the 1st nozzle hole 21 and the 2nd nozzle hole 22 are arrange | positioned by mutually shifting the position of the circumferential direction.

  According to the present embodiment described above, when the energization direction to the drive coil is in the positive direction, the fuel F1 is injected from the first injection hole 21 (see FIG. 12A) and is formed by the fuel jet F1. The spray shape can be formed into a substantially hollow conical spray shape having a relatively small extent (see FIG. 12B). In the reverse direction, the energization direction to the drive coil is switched, and fuels F1 and F2 are injected from the first injection hole 21 and the second injection hole 22 (see FIG. 13A), and the fuel jets F1 and F2 are injected. The spray formed in (2) is arranged in duplicate inside and outside (see FIG. 13 (b)). Specifically, a substantially hollow conical spray (jet F1 group) having a relatively small expanse is arranged inside a substantially hollow conical spray (jet F2 group) having a relatively large expanse. As a result, these sprays can increase the contact area with air as a whole.

  Even if it is such a structure, the effect similar to 4th Embodiment can be acquired.

(Sixth embodiment)
In the sixth embodiment, the first nozzle holes 21 and the second nozzle holes 22 described in the fifth embodiment are replaced with an arrangement capable of forming double sprays inside and outside, and shown in FIG. As described above, the fuel injection directions of the entire spray are different between the spray of the first nozzle hole 21 and the spray of the second nozzle hole 22. FIG. 14 is a schematic view showing an example of the spray shape of the injected fuel from the valve portion according to the present embodiment, and FIG. FIG. 14B is a perspective view showing the shape of the tip side of the spray. FIG. 15 is a schematic view showing another example of the sprayed shape of the injected fuel from the valve portion according to the present embodiment, and FIG. 15 (a) shows the first injection hole and the second injection hole that the valve portion has. FIG. 15B is a perspective view showing the shape of the tip side of the spray.

  As shown to Fig.15 (a), the 1st nozzle hole 21 and the 2nd nozzle hole 22 are arrange | positioned by mutually shifting the position of the circumferential direction. The nozzle hole shaft of the first nozzle hole 21 is arranged so as to be jetted toward the right direction in FIG. The nozzle hole axis of the second nozzle hole 22 is arranged so as to be jetted toward the left in FIG. 15A as a whole.

  Even if it is such a structure, the effect similar to 5th Embodiment can be acquired.

  In the stratified charge combustion operation, it may be injected toward the ignition device such as a plug, and in the case of homogeneous combustion, it may be desired to disperse widely throughout the cylinder (combustion chamber). In this case, during the stratified combustion operation, fuel can be injected only from the first injection holes 21 to form a spray (see FIG. 14B) having a relatively small spread in the plug direction. During the homogeneous combustion operation, fuel is injected from both the first nozzle hole 21 and the second nozzle hole 22, and even if each spray is a spray having a relatively small spread, the entire spray is in the cylinder (combustion chamber). ) Widely dispersed (see FIG. 15B).

(Seventh embodiment)
In the seventh embodiment, in the first nozzle hole 21 and the second nozzle hole 22 described in the sixth embodiment, the sprays of the first nozzle hole 21 and the second nozzle hole 22 are formed in a substantially conical shape. Instead, as shown in FIG. 17B, it is arranged so as to form a deformed deflected spray. FIG. 16 is a schematic diagram showing an example of the spray shape of the injected fuel from the valve portion according to the present embodiment, and FIG. 16 (a) shows the fuel injected from the first injection hole in the valve portion. FIG. 16B is a perspective view showing the shape of the tip side of the spray. FIG. 17 is a schematic view showing another example of the spray shape of the injected fuel from the valve portion according to the present embodiment, and FIG. 17A shows the first injection hole and the second injection hole that the valve portion has. FIG. 17B is a perspective view showing the shape of the tip side of the spray.

  As shown to Fig.17 (a), the 1st nozzle hole 21 and the 2nd nozzle hole 22 are each arrange | positioned on a substantially semicircle, and it is arrange | positioned so that the position of the mutual circumferential direction of a substantially semicircle may not overlap. Yes.

  Even if it is such a structure, the effect similar to 6th Embodiment can be acquired.

(Eighth embodiment)
In order to perform stratified combustion when fuel is directly injected into a cylinder of an internal combustion engine (specifically, a combustion chamber), the fuel is injected into the combustion chamber during the compression stroke, and a combustible range is located near a local area such as a spark plug. It is necessary to form an air-fuel mixture, and to form an ultra-lean air-fuel mixture having an air-fuel ratio (A / F) of 25 to 50) in the entire combustion chamber (overall). On the other hand, in order to perform homogeneous combustion, it is necessary to inject fuel into the combustion chamber during the intake stroke and to widely disperse the spray throughout the combustion chamber without colliding with the wall of the combustion chamber such as a piston or cylinder. For this reason, the fuel spray reach distance (hereinafter referred to as penetration) in the fuel injection mode for stratified combustion and the fuel injection mode for homogeneous combustion may be different.

  In the eighth embodiment, in the first nozzle hole 21 and the second nozzle hole 22 described in the fifth embodiment, the nozzle hole area A1 of the first nozzle hole 21 is set to the second as shown in FIG. The nozzle hole 22 is configured to be smaller than the nozzle hole area A2 (A1 <A2). FIG. 18 is a schematic view showing an example of the spray shape of the injected fuel from the valve portion according to the present embodiment, and FIG. 18 (a) shows the fuel injected from the first injection hole in the valve portion. FIG. 18B is a perspective view showing the shape of the tip side of the spray. FIG. 19 is a schematic view showing another example of the spray shape of the injected fuel from the valve portion according to the present embodiment, and FIG. 19A is a first nozzle hole and a second nozzle hole provided in the valve portion. The perspective view which shows the injection shape of the fuel injected from FIG. 19, FIG.19 (b) is a perspective view which shows the shape of the front end side of the spray. FIG. 20 is a flowchart showing a control process for switching the fuel injection mode according to the embodiment. FIG. 21 is a map configuration diagram for setting the combustion mode executed in the internal combustion engine according to the present embodiment. FIG. 22 is a schematic cross-sectional view showing an example of a spray state in the combustion chamber of the internal combustion engine according to the present embodiment. FIG. 23 is a schematic cross-sectional view showing another example of the spray state to the combustion chamber of the internal combustion engine according to the present embodiment.

  22 shows an intake stroke in which the piston moves downward (arrow direction in the drawing), and FIG. 23 shows a compression stroke in which the piston moves upward (arrow direction in the drawing). FIG. 21 shows the rotational speed Ne of the internal combustion engine on the horizontal axis and the load T of the internal combustion engine on the vertical axis, and combustion occurs in an operation region such as a partial load where the rotational speed Ne is approximately Ne1 and T1 or less. It shows that the combustion mode is homogeneous combustion in the operation region such as stratified combustion and other regions such as high load.

  Since the injection hole area A1 of the first injection hole 21 is smaller than the injection hole area A2 of the second injection hole 22 (A1 <A2), the penetration L1 of the fuel F1 injected from the first injection hole 21 is the second It becomes shorter than the penetration L2 of the fuel F2 injected from the injection hole 22. The spray formation means is not limited to the nozzle hole area A1 of the first nozzle hole 21 smaller than the nozzle hole area A2 of the second nozzle hole 22, and the penetration L1 of the fuel F1 is shorter than the penetration L2 of the fuel F2. Any forming means may be used.

  The flow rate of the fuel injected from the first injection hole 21 changes according to the lift amount of the first needle 31. Therefore, in the stratified charge combustion operation as shown in FIGS. 18 and 22, the fuel is injected in the low lift state (H = HD1), and in the homogeneous combustion operation as shown in FIGS. 19 and 23, the high lift state (H = HD2). Therefore, the penetration L1 of the fuel F1 injected during the stratified combustion operation (specifically, the low lift state) is compared with the penetration L1 of the fuel F1 injected during the homogeneous combustion operation (specifically, the high lift state). Become shorter.

  Since the fuel F1 is injected from the first injection hole 21 having a relatively small injection hole area A1, it is easily atomized. As a result, the fuel F1 is easily atomized even when it is injected in a limited manner (refer to the cavity 104a in detail) in the combustion chamber 106 (see FIG. 22), so the fuel F1 is the air around the fuel. Therefore, it is possible to form an air-fuel mixture in a combustible range that can be ignited and combusted by an ignition device such as a spark plug.

  22 and 23, the engine 100 includes a cylinder block 101, a cylinder head 102, a piston 104, an inner peripheral wall of a cylinder block (hereinafter referred to as a cylinder) 101, a piston 104, and a cylinder. This is a known internal combustion engine including a combustion chamber 106 defined by the ceiling inner wall of the head 102. The reciprocating motion of the piston 104 in the inner peripheral wall of the cylinder 101 is converted into a continuous rotational motion of a crankshaft (not shown) via a connecting rod (not shown). A cavity 104 a is formed in a concave shape at the top of the piston 104. Here, FIGS. 22 and 23 show only one of the four cylinders in the drawing, and FIGS. 18 and 19 show fuel injection valves provided in the cylinders shown in FIGS. 22 and 23. Is shown.

  A fuel injection control method for the fuel injection device 1 having the above-described configuration, particularly a method for switching the fuel injection mode, will be described with reference to FIGS. As shown in FIG. 20, in S201 (S is a step), signals from various sensors (not shown) for detecting the operating state of the engine such as the engine speed Ne, the intake pipe pressure (or intake air amount) PM, the cooling water temperature Tw, and the like. Is read into the ECU 100. From these signals, the operating state of the engine 100 (specifically, the relationship between the load T and the rotational speed Ne) is detected. In S202, it is determined whether the required combustion mode is stratified combustion based on the load T corresponding to the detected operating state and the rotational speed Ne. If the rotational speed Ne and the load T are in a partial load state (for example, Ne1 or less, T1 or less), it is determined that the combustion mode is stratified combustion based on the map shown in FIG. 21, and the process proceeds to S203. If the rotational speed Ne and the load T are in an operating state such as a high load other than the partial load, it is determined that the combustion mode is homogeneous combustion based on the map shown in FIG. 21, and the process proceeds to S204.

  In S203, if it is determined that the combustion mode required in S202 is stratified combustion, the ECU 100 sets the lift amount of the injector 2 to a low lift state (H = HD1). Specifically, the ECU 100 sets the energization direction to the drive coil to the positive direction by the energization direction switching circuit 100b.

  Note that, in a low lift state (specifically, when the energization direction to the drive coil is a positive direction), the fuel F1 is injected from the first injection hole 21, and the penetration L1 of the fuel jet F1 is the injection of the first injection hole 21. Since the hole area (opening area) is relatively small, it becomes relatively short (refer to FIG. 18B), and the comparison is made toward the combustion chamber 106 having a relatively small volume during the compression stroke (specifically, the cavity 104a of the piston 104). A spray having a small spread (specifically, spray angle α1) can be formed (see FIG. 22).

  In S204, if it is determined that the combustion mode required in S202 is homogeneous combustion, the ECU 100 sets the lift amount of the injector 2 to a high lift state (H = HD2). Specifically, the ECU 100 sets the energization direction to the drive coil in the reverse direction.

  In the high lift state (specifically, the energization direction of the drive coil is the reverse direction), the fuels F1 and F2 are injected from the first injection hole 21 and the second injection hole 22 (see FIG. 19A). The sprays formed by the fuel jets F1 and F2 are doubled inside and outside (see FIG. 19B), and these sprays can increase the contact area with air as a whole. Further, since the nozzle hole area (opening area) of the second nozzle hole 22 is relatively large, the penetration L2 of the fuel jet F2 is longer than that of the fuel jet F12 (L2> L1). As a result, it is possible to form a substantially hollow conical spray (jet F2 group) having a relatively large spread α2 (α2> α1) in the combustion chamber 106 having a relatively large volume during the intake stroke.

  In the present embodiment described above, the variable lift means 60, 80, 100 b are provided, and the variable lift means 60, 80, 100 b open the first needle 31 when the engine 100 performs the stratified combustion operation, thereby making the engine 100 homogeneous. Since the first needle 31 and the second needle 32 are opened during the combustion operation, the fuel F1 is supplied from the first injection hole 21 during the stratified combustion operation, and the fuel can be injected toward the internal portion of the combustion chamber 106 during the compression stroke. . On the other hand, during the homogeneous combustion operation, the fuels F1 and F2 are supplied from both the first nozzle hole 21 and the second nozzle hole 22, and the fuel can be injected so as to be widely dispersed throughout the combustion chamber 106 during the intake stroke.

(Ninth embodiment)
In an engine 100 including two intake valves 107a and 107b and a combustion chamber 106 that guides air when the intake valves 107a and 107b are opened, there is a so-called port injection that injects fuel into an intake port such as a cylinder head 102 ( (Refer FIG.24 (b)). The intake valves 107a and 107b are seated and separated from the wall surface of the intake port, thereby closing and closing the intake valves. The air flowing in the intake port is guided to the combustion chamber 106 from the gap between the intake valves 107a and 107b and the wall surface by separating the intake valves 107a and 107b.

  When lean burn combustion is desired in this port injection, a method of generating a relatively strong swirl by stopping one of the intake valves 107a and 107b is conceivable. However, if the intake valve is completely deactivated, the fuel injected by the port is attached to the deactivated intake valve, which causes a problem that the intake valve cannot be completely closed.

  In the ninth embodiment, the injector 2 having the first injection hole 21 and the second injection hole 22 described in the sixth embodiment is replaced with two intake valves 107a and 107b as shown in FIG. The present invention is applied to an engine 100 that can temporarily keep one intake valve 107a completely closed (hereinafter referred to as an engine with a valve pause function). FIG. 24 is a schematic cross-sectional view showing a sprayed state around the intake valve of the internal combustion engine according to the present embodiment, and FIG. 24 (a) shows that one of the two intake valves is not operating. FIG. 24B is a schematic cross-sectional view showing the spray state when both of the two intake valves are in valve operation. FIG. 25 is a flowchart showing a fuel injection control process according to this embodiment.

  In FIG. 24A and FIG. 24B, when the valve operation in which the intake valves 107a and 107b are separated and seated on the wall surface of the port is in a resting valve resting state, the inside of the circle is indicated by hatching. On the other hand, in the normal valve operation state, the circle is shown in white. In order to distinguish the pause of the intake valve 107a and the intake valve 107b, the circle on the intake valve 107a side is marked with a symbol IN1, and the circle on the intake valve 107b side is marked with a symbol IN2. In this embodiment, as shown in FIG. 24A, the valve operation on the intake valve 107a side is stopped.

  A fuel injection control method of the fuel injection device 1 having the above configuration will be described with reference to FIG. As shown in FIG. 25, in S301, signals of various sensors (not shown) for detecting the operating state of the engine such as the engine rotational speed Ne, the intake pipe pressure (or intake air amount) PM, and the cooling water temperature Tw are read into the ECU 100. In S302, based on these signals, the ECU 100 determines a required operating state. Thereby, for example, the lean burn combustion mode is selected as the required operating state. In this case, in order to generate a relatively strong swirl, it is necessary to perform a valve operation of stopping one of the two intake valves.

  In S303, it is determined whether or not the two intake valves 107a and 107b are to be operated based on the requested operation state. If the requested operation state is one in which one of the intake valves 107a and 107b such as lean burn combustion operation is stopped, it is determined that the entire operation is not performed, and the process proceeds to S304. If the requested operation state is something other than lean burn combustion operation or the like, it is determined that both intake valves 107a and 107b are fully operated, and the process proceeds to S306.

  In S304, if it is determined in S303 that both intake valves 107a and 107b are fully operated, both intake valve 107a (IN1) and intake valve 107b (IN2) are put into a valve operating state, and the process proceeds to S305. In S305, the ECU 100 sets the lift amount of the injector 2 to a high lift state (H = HD2). Specifically, the ECU 100 sets the energization direction to the drive coil in the reverse direction.

  In S306, if it is determined in S303 that the entire operation of the intake valves 107a and 107b is not to be performed, the valve operation of the intake valve 107a (IN1) is set to a pause state. On the other hand, the intake valve 107b (IN2) is operated to remain in the valve operating state. In step S307, the ECU 100 sets the lift amount of the injector 2 to a low lift state (H = HD1). Specifically, the ECU 100 sets the energization direction to the drive coil to the positive direction.

  In the present embodiment described above, the variable lift means 60, 80, and 100b are provided, and the variable lift means 60, 80, and 100b are configured such that one of the two intake valves 107a and 107b stops the valve operation. The first needle 31 is opened when the intake valve 107a and 107b are both operating, and the first needle 31 and the second needle 32 are opened when both the intake valves 107a and 107b are operating. In this case, the fuel supply to one intake valve 107a is stopped, and the fuel F1 can be supplied from the first injection hole 21 to the other intake valve 107b (see FIG. 24A).

(Other embodiments)
In the ninth embodiment described above, the injector 2 having the first injection hole 21 and the second injection hole 22 described in the sixth embodiment is applied to the engine 100 with a valve pause function. The injector 2 having the first injection hole 21 and the second injection hole 22 described in the seventh embodiment may be applied. When one of the two intake valves is at rest, the first needle 31 is opened, and when both of the two intake valves are separated, the first needle 31 and the second needle 32 are opened. Can be opened. Accordingly, when the other intake valve is at rest, the injection of the second injection hole 22 corresponding to the second needle 32 is stopped, and when both intake valves are separated, the first needle 31 and the second needle 32 are used. The injection of the first injection hole 21 and the second injection hole 22 corresponding to is allowed. As a result, when one of the two intake valves is at rest, it is possible to change the injection direction of the injected fuel as a whole or to prohibit the injection in a partial direction.

  Here, when the engine 100 is stratified combustion operation and homogeneous combustion operation, the stratified combustion operation is mainly a partial load operation region such as a medium speed and a medium load or less of the engine 100, and is required in this operation region. The injection amount is relatively small. On the other hand, the homogeneous combustion operation is mainly in a high load operation region such as high speed and high load of the engine 100, and the injection amount required in this operation region is relatively large. On the other hand, in the fuel injection device 1 described in the first to ninth embodiments, the lift variable means 60, 80, 100b are lift amounts (specifically, high amounts when the first needle and the second needle are opened). Since the lift H = HD2) is formed to be larger than the lift amount (specifically, the low lift H = HD2) at the time of opening the first needle, it is possible to improve the injection amount dynamic range in which the injection amount can be adjusted.

It is a fragmentary sectional view showing the composition of the fuel injection device of a 1st embodiment of the present invention. It is sectional drawing which shows the fuel path | route in the fuel injection valve in FIG. It is typical sectional drawing which shows the operation state of the fuel-injection apparatus of FIG. 1, Comprising: It is a fragmentary sectional view which shows the non-energized state of a drive coil. It is a typical sectional view showing the operation state of the fuel injection device of Drawing 1, and is a fragmentary sectional view showing the forward direction state of the energization direction to a drive coil. It is a typical sectional view showing the operation state of the fuel injection device of Drawing 1, and is a fragmentary sectional view showing the reverse direction state of the energization direction to a drive coil. It is a typical circuit diagram which shows the electrical structure concerning 1st Embodiment. It is a figure showing the switching operation of the switching means which switches the electricity supply direction to the electromagnetic coil in FIG. It is a fragmentary sectional view showing the composition of the fuel injection device of a 2nd embodiment. It is a fragmentary sectional view showing the composition of the fuel injection device of a 3rd embodiment. FIG. 10A is a schematic diagram illustrating an example of a spray shape of injected fuel from a valve portion according to the fourth embodiment, and FIG. 10A is an injection shape of fuel injected from a first injection hole provided in the valve portion. FIG. 10B is a perspective view showing the shape of the tip side of the spray. It is a schematic diagram which shows the other Example of the spray shape of the injection fuel from the valve part concerning 4th Embodiment, Comprising: Fig.11 (a) is injected from the 1st injection hole and 2nd injection hole which have in a valve part. FIG. 11B is a perspective view showing the shape of the tip side of the spray. FIG. 12A is a schematic diagram illustrating an example of a spray shape of injected fuel from a valve portion according to the fifth embodiment, and FIG. 12A is an injection shape of fuel injected from a first injection hole provided in the valve portion. FIG. 12B is a perspective view showing the shape of the tip side of the spray. FIG. 13A is a schematic view showing another example of the spray shape of the injected fuel from the valve portion according to the fifth embodiment, and FIG. 13A is injected from the first injection hole and the second injection hole that the valve portion has. FIG. 13B is a perspective view showing the shape of the tip side of the spray. FIG. 14A is a schematic diagram illustrating an example of a spray shape of injected fuel from a valve portion according to a sixth embodiment, and FIG. 14A is an injection shape of fuel injected from a first injection hole provided in the valve portion. FIG. 14B is a perspective view showing the shape of the tip side of the spray. It is a schematic diagram which shows the other Example of the spray shape of the injection fuel from the valve part concerning 6th Embodiment, Comprising: Fig.15 (a) is injected from the 1st nozzle hole and 2nd nozzle hole which have in a valve part. FIG. 15B is a perspective view showing the shape of the tip side of the spray. It is a schematic diagram which shows one Example of the spray shape of the injection fuel from the valve part concerning 7th Embodiment, Comprising: Fig.16 (a) is the injection shape of the fuel injected from the 1st injection hole which has in a valve part. FIG. 16B is a perspective view showing the shape of the tip side of the spray. It is a schematic diagram which shows the other Example of the spray shape of the injection fuel from the valve part concerning 7th Embodiment, Comprising: Fig.17 (a) is injected from the 1st nozzle hole and 2nd nozzle hole which have in a valve part. FIG. 17B is a perspective view showing the shape of the tip side of the spray. FIG. 18A is a schematic diagram illustrating an example of a spray shape of injected fuel from a valve portion according to an eighth embodiment, and FIG. 18A is an injection shape of fuel injected from a first injection hole provided in the valve portion. FIG. 18B is a perspective view showing the shape of the tip side of the spray. It is a schematic diagram which shows the other Example of the spray shape of the injection fuel from the valve part concerning 8th Embodiment, Comprising: Fig.19 (a) is injected from the 1st nozzle hole and 2nd nozzle hole which have in a valve part. FIG. 19B is a perspective view showing the shape of the tip side of the spray. It is a flowchart which shows the control processing for switching the fuel-injection mode concerning 8th Embodiment. It is a map block diagram for setting the combustion form performed with the internal combustion engine concerning 8th Embodiment. It is typical sectional drawing which shows one Example of the spray state to the combustion chamber of the internal combustion engine concerning 8th Embodiment. It is typical sectional drawing which shows the other Example of the spray state to the combustion chamber of the internal combustion engine concerning 8th Embodiment. FIG. 24A is a schematic cross-sectional view showing a spray state around the intake valve of the internal combustion engine according to the ninth embodiment, and FIG. 24A is a view when one of the two intake valves is not operating. FIG. 24B is a schematic cross-sectional view showing the spray state when both of the two intake valves are operating. It is a flowchart which shows the control processing of the fuel injection concerning 9th Embodiment.

Explanation of symbols

1 Fuel injector 2 Injector (fuel injection valve)
11 Nozzle body (valve body)
12 Conical surface (valve seat)
DESCRIPTION OF SYMBOLS 15 Cylindrical member 17 Magnetic body 20 Injection hole part 21 1st injection hole 22 2nd injection hole 30 Nozzle needle (valve member)
31 1st needle 32 2nd needle 50 Movable core 60 Core 70 Coil (part of drive coil)
80 Permanent magnet (magnetizing member)
100 ECU (control means)
100a Control unit 100b Energizing direction switching circuit B Valve unit S Electromagnetic drive unit

Claims (8)

A nozzle body having a first nozzle hole and a second nozzle hole;
A nozzle needle that is movably disposed in the nozzle body and has a first needle that opens and closes the first nozzle hole, and a second needle that opens and closes the second nozzle hole;
A movable core capable of cooperating with the nozzle needle;
A core made of a magnetic material facing the movable core in the axial direction;
A drive coil capable of applying a magnetic force to the movable core and the core;
A magnetizing member capable of attracting the core to the non-movable core and repelling the movable core;
The nozzle needle formed by doubling the first needle and the second needle inside and outside independently increases or decreases the opening area of the first nozzle hole and the second nozzle hole ,
The magnetizing member is a permanent magnet disposed on the non-movable core side of the core, and is located outside a magnetic circuit formed around the driving coil when the driving coil is energized. Injection device. The fuel injection device according to claim 1, wherein a magnetic body is disposed between the core and the permanent magnet . The energization direction to the drive coil is reversed between when one of the first needle and the second needle is opened and when both the first needle and the second needle are opened. The fuel injection device according to claim 1 or 2. In the fuel-injection apparatus as described in any one of Claims 1-3,
The nozzle needle of the first needle and the second needle, one of the needle in cooperation with the movable core, to that fuel injection and the other needle, characterized in that cooperating with said core apparatus. In the fuel-injection apparatus as described in any one of Claims 1-3,
Fuel injection device it and moving the first is brought into contact needle and the second needle of the first needle and the second needle in the opening direction. The fuel injection device according to any one of claims 1 to 5 ,
An intake port;
Two intake valves seated on and away from the wall of the intake port;
Used in an internal combustion engine comprising a combustion chamber that guides air flowing in the intake port from a gap between the intake valve and the wall surface by separating the intake valve,
When one of the two intake valves is separated, the first needle is moved in the valve opening direction,
The fuel injection device, wherein when both of the two intake valves are separated, the first needle and the second needle are moved in a valve opening direction . The fuel injection device according to any one of claims 1 to 5 ,
Used in internal combustion engines where fuel is directly supplied into the cylinder,
During the stratified combustion operation, the first needle is moved in the valve opening direction,
A fuel injection apparatus, wherein the first needle and the second needle are moved in a valve opening direction during homogeneous combustion operation . The fuel injection device according to any one of claims 1 to 7, further comprising switching means for switching an energization direction to the drive coil .

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