JPH0821333A - Fuel injection device - Google Patents

Abstract

PURPOSE:To provide a fuel injection device in which pressure pulsation wave can be easily damped by simple constitution, and control accuracy for a fuel injection quantity and a fuel injection rate is high. CONSTITUTION:A resonant chamber 20a and a neck passage 20b are formed in a resonator 20, and the resonant chamber 20a is communicated to the fuel passage formed in a fuel feed tube 3 through the neck passage 20b. A resonant chamber 21a and a neck passage 21b are formed in a resonator 21, and the resonant chamber 21a is communicated to the fuel passage formed in a branch feed tube 8 through the neck passage 21b. Pressure pulsation wave generated in the fuel feed tube 3 and the branch feed tube 8 is damped by resonance action of the respective resonators 20, 21, and hence the injection pressure of fuel injected from an injection valve 6 to an engine 5 can be accurately controlled to be a prescribed value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection device for an internal combustion engine (hereinafter "internal combustion engine" is called an engine).

[0002]

2. Description of the Related Art Instead of a conventional mechanical fuel injection pump and fuel injection system consisting of a fuel injection nozzle,
In recent years, as an electronically controlled fuel injection device with better controllability, a pressure-regulating mechanism is provided with a common rail that can be adjusted to a predetermined pressure, and a high-pressure fuel accumulated in the common rail is injected into an engine cylinder by an injection valve. Fuel injection devices are known.

In this type of fuel injection device, as shown in FIG. 9, a high pressure fuel supply pump 101 is used to supply a fuel supply pipe 102.
The high-pressure fuel is pumped into the common rail 103 through the, and the high-pressure fuel is accumulated in the common rail 103. High pressure fuel is distributed and supplied from the common rail 103 to each cylinder of the engine 105 through a branch supply pipe 104, and a solenoid valve 106 is provided.
The engine 10 through the injection valve 107 by opening
High-pressure fuel is injected into each cylinder of No. 5. Then, the injection valve 107 is rapidly closed to terminate the fuel injection. At this time, an oil hammer of the high-pressure fuel occurs in the branch supply pipe 104, and this oil hammer propagates in the branch supply pipe 104 and is transmitted to the common rail 103, which causes pressure pulsation.

That is, from the injection valve 107 to the branch supply pipe 1
When a part of the pressure wave propagating through 04 reaches the connecting portion with the common rail 103, the phase is inverted due to the cross-sectional area expanding action to become an expansion wave, which is reflected again from the branch supply pipe 104 toward the injection valve 107. Other pressure waves are common rail 10
Propagate within 3. From common rail 103 to injection valve 107
The pressure wave reflected by is reflected again at the seating portion of the injection valve 107, propagates through the branch supply pipe 104, and travels toward the common rail 103. In this way, the pressure pulsating wave is generated by the pressure wave reciprocating in the branch supply pipe 104. When this pressure pulsation wave propagates to the common rail 103, the injection pressure is changed while the injection valve 107 of another cylinder is injecting fuel, and this pressure interference changes the predetermined injection amount and injection rate. There is. In addition, there is a problem that pressure waves reflected in the same branch supply pipe 104 from the common rail 104 toward the injection valve 107 cause variations in the next valve opening timing of the injection valve 107, making it difficult to perform highly accurate fuel injection control. .

Further, a part of the fuel supplied from the high-pressure fuel supply pump 101 to the common rail 103 via the fuel supply pipe 102 is phase-inverted at the connecting portion between the fuel supply pipe 102 and the common rail 103 by the cross-sectional area expanding action. It becomes an expansion wave, and the high pressure fuel supply pump 101 is connected to the fuel supply pipe 102 again.
Reflect toward. The pressure wave reflected from the common rail 103 toward the high-pressure fuel supply pump 101 is reflected again by the check valve 108 for preventing backflow and propagates through the fuel supply pipe 102 toward the common rail 103. In this way, when the pressure wave reciprocates in the fuel supply pipe 102 and propagates to the common rail 103, as described above, a part of the pressure wave directly propagates into the common rail 103 and the injection valve 107 injects fuel. Sometimes, the injection pressure is changed, and there is a problem that the predetermined injection amount and injection rate change due to this pressure interference.

In order to solve such a problem, it is conceivable to connect a damping branch pipe whose end is closed to a branch supply pipe for supplying fuel from a common rail to an injection valve. This is because the pressure wave generated in the branch supply pipe generates another pressure wave in the damping pipe, which is out of phase, and the pressure wave in the attenuation branch pipe interferes with the pressure wave in the branch supply pipe. The pressure pulsation wave in the branch supply pipe is attenuated.

[0007]

However, in the case of attenuating the pressure pulsation wave by the phase-shifted pressure waves generated in the damping branch pipe, the phase difference is defined by the length of the damping branch pipe. However, there is a problem that the damping branch pipe cannot be formed in a desired length when the space in the engine room is limited.

The present invention has been made in order to solve such a problem, and a pressure pulsation wave can be easily attenuated with a simple structure, and a fuel injection device having a high control accuracy of the fuel injection amount and the fuel injection rate. The purpose is to provide.

[0009]

A fuel injection device according to claim 1 of the present invention for achieving the above object, a fuel supply pump, a common rail for accumulating fuel supplied from the fuel supply pump, and A fuel supply pipe having a first fuel passage connecting the fuel supply pump and the common rail and capable of supplying fuel from the fuel supply pump to the common rail; and an injection valve provided for each cylinder of the internal combustion engine,
A resonator having a branch supply pipe connecting the common rail and the injection valve, having a second fuel passage capable of supplying high-pressure fuel accumulated in the common rail to the injection valve, a neck passage, and a resonance chamber. A resonance provided in at least one of the fuel supply pipe and the branch supply pipe, the resonance chamber communicating with the first fuel passage or the second fuel passage and the neck passage. And a container. A fuel injection device according to claim 2 of the present invention is the fuel injection device according to claim 1, which is a resonator having a neck passage and a resonance chamber, wherein at least one of the fuel supply pipe and the branch supply pipe is provided. A first orifice provided on one side of the first fuel passage or the second fuel passage and formed in the fuel downstream side, instead of the resonator communicating with the resonance chamber via the neck passage. A second orifice formed on the fuel upstream side, and the first orifice
A resonance chamber formed between the first orifice and the second orifice, the resonance chamber being formed between the first orifice and the second supply orifice, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe. The second orifice and the resonance chamber form a part of the first fuel passage or the second fuel passage, and one of the first orifice and the second orifice has a diameter larger than that of the other. It is characterized by having a small resonator.

The fuel injection device according to claim 3 of the present invention is
The fuel injection device according to claim 1, wherein the resonator has a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, and the first fuel passage or In place of the resonator in which the resonance chamber communicates with the second fuel passage and the neck passage, a check valve provided on the fuel upstream side and closing the fuel upstream side is a check valve, and the check valve is the fuel upstream side. A resonator having an orifice on the downstream side of the fuel and a resonance chamber formed between the orifice and the check valve, the fuel supply pipe and the branch being provided. It is characterized in that a resonator is provided in at least one of the supply pipes, and the orifice and the resonance chamber include a resonator forming a part of the first fuel passage or the second fuel passage.

A fuel injection device according to a fourth aspect of the present invention is
The fuel injection device according to claim 1, wherein the resonator has a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, and the first fuel passage or In place of the resonator in which the resonance chamber communicates with the second fuel passage and the neck passage, an orifice valve penetrating in the axial direction and having an orifice penetrating in the axial direction and the orifice valve are energized. And a second seat for contacting the orifice valve, a check valve provided on the fuel upstream side, and a second urging means for urging the check valve toward the fuel upstream side. A resonator having a resonance chamber formed between an orifice valve and the check valve, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, and the orifice and the resonance chamber. Characterized in that it comprises a resonator which forms part of the serial first fuel passage or the second fuel passage.

The fuel injection device according to claim 5 of the present invention is
When the frequency of the pressure pulsation wave generated in the first fuel passage or the second fuel passage f, and the resonant frequency of the resonator and _{f r, (1 / 1.3)} f ≦ f r ≦ 1. It is preferably 75f.

[0013]

According to the fuel injection device of the first aspect of the present invention, a pressure pulsation wave propagating to the injection valve is attenuated by providing a resonator in at least one of the fuel supply pipe and the branch supply pipe. Because you can
The predetermined fuel injection amount and fuel injection rate can be maintained satisfactorily.

According to a second aspect of the fuel injection device of the present invention, a resonator is provided in at least one of the fuel supply pipe and the branch supply pipe, and the first orifice, the second orifice, and the resonance chamber are provided. By forming a part of the first fuel passage or the second fuel passage, it is possible to easily install the resonator in the space in the engine room.

Further, according to the third aspect of the present invention, since the check valve is provided on the fuel upstream side, only one orifice is formed on the resonator on the fuel downstream side. The pressure loss at the time can be reduced. Further, according to the fuel injection device of claim 4 of the present invention, an orifice valve having an orifice penetrating in the axial direction is provided on the fuel downstream side, and the orifice valve lifts at the time of fuel supply, so that the pressure at the time of fuel supply is increased. The loss can be further reduced.

According to a fifth aspect of the fuel injection device of the present invention, the frequency of the pressure pulsation wave generated in the first fuel passage or the second fuel passage is f, and the resonance frequency of the resonator is f _r. And (1 / 1.3) f ≤ _fr ≤ 1.75
By forming the resonator so as to satisfy f, the pressure pulsation wave can be favorably damped.

[0017]

An embodiment of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 shows a fuel injection device according to a first embodiment of the present invention. A check valve 2 is arranged on the fuel discharge side of the high-pressure fuel supply pump 1, and the high-pressure fuel supply pump 1 is connected to a common rail 4 from the check valve 2 via a fuel supply pipe 3. A pressure sensor 19 that detects the fuel pressure in the common rail 4 is installed on the common rail 4.
In the engine 5, an injection valve 6 is arranged in each combustion chamber of each cylinder. The fuel injection into each cylinder by the injection valve 6 is controlled by opening and closing the electromagnetic valve 7 for injection control. Each injection valve 6 is connected to a common rail 4 common to each cylinder via a branch supply pipe 8. The resonator 20 is attached to the fuel supply pipe 3 on the fuel downstream side of the check valve 2, and
Is attached to the branch supply pipe 8 on the fuel upstream side of the injection valve 6.

An electronic control unit (ECU) 15 inputs information on engine speed and engine load from an engine speed sensor 16, an engine load sensor 17, etc., and responds to the engine operating condition judged by these engine operating information. The optimum fuel injection timing and fuel injection amount are calculated, and an opening / closing signal is sent to the solenoid valve 7. The ECU 15
Controls the discharge amount control device 18 of the high-pressure fuel supply pump 1 based on the pressure signal input from the pressure sensor 19 in order to optimize the pressure of the fuel supplied from the common rail 4 to the injection valve 6 according to the engine speed and engine load. Send a signal.

The fuel sucked up from the fuel tank 10 by the fuel pump 9 is supplied to the high-pressure fuel supply pump 1 and pressurized, and then supplied to the common rail 4 via the check valve 2 and the fuel supply pipe 3. The common rail 4 accumulates the supplied high pressure fuel and holds it at a high pressure. The high pressure fuel accumulated in the common rail 4 is supplied to each injection valve 6 at a constant pressure via the branch supply pipe 8.

A resonance chamber 20a and a neck passage 20b are formed in the resonator 20, and the resonance chamber 20a is formed in the neck passage 20b.
Through a fuel passage formed in the fuel supply pipe 3. The resonance chamber 21a and the neck passage 2 are also provided in the resonator 21.
1b is formed, and the resonance chamber 21a communicates with the fuel passage formed in the branch supply pipe 8 via the neck passage 21b.

Next, the operation of the fuel injection device of FIG. 1 will be described with reference to FIG. As shown in FIG. 2, the injection valve 6
When the injection needle 6a is seated on the valve seat 6b and the injection valve 6 is closed and fuel injection is completed, the branch supply pipe 8
An oil hammer occurs inside and a pressure wave 101 is generated. Pressure wave 101
Propagates in the branch supply pipe 8 at the speed of sound a and reaches the connecting portion 11 between the branch supply pipe 8 and the common rail 4. Pressure wave 101
Is reflected by the connecting portion 11 by the action of expanding the cross-sectional area from the branch supply pipe 8 to the common rail 4 and the phase is inverted to form an expansion wave 102 that is a negative pressure wave, and the inside of the branch supply pipe 8 is directed toward the injection valve 6. Propagate. The expansion wave 102 is reflected at the seating portions of the nozzle needle 6a and the valve seat 6b in the same phase, and the expansion wave 103 propagates to the common rail 4. The expansion wave 103 inverts the phase again due to the action of expanding the cross-sectional area in the connecting portion 11, and the pressure wave 104 flows through the branch supply pipe 8 into the injection valve
Propagate to

The pressure pulsation wave propagating in the branch supply pipe 8 is
Two cycles are made in the branch supply pipe 8 to form one cycle. Since the pressure pulsation wave propagates in the branch supply pipe 8 at the speed of sound, the pulsation frequency f
_i is represented by the following equation 1.

[0023]

[Equation 1]

Here, L _i is the nozzle needle 6a and the valve seat 6
The path length from the seated portion with b to the connection portion 11 is shown. On the other hand, the resonance frequency f _r of the resonator 21, the volume V _r of resonance chambers 21a, path length of the neck passage 21b L _r, neck passage 21b
It is defined by the flow path cross-sectional area S _r of and is expressed by the following equation 2.

[0025]

[Equation 2]

Regarding the pressure pulsation wave in the fuel supply pipe 3,
The pulsation frequency f _p is expressed by the following equation 3.

[0027]

(Equation 3)

Where L_pCheck with common rail 4
It represents the length of the passage of the valve 2 to the seat. On the other hand, the resonator 20
Ringing frequency f_rIs the same as the resonator 21 in the resonance chamber 20a.
Volume V _r, Passage length L of the neck passage 20b_r, Neck passage 20
b channel cross-sectional area S_rDefined by
Be done. Next, the resonator 20 is propagated through the fuel supply pipe 3.
Pulsation frequency f of pressure pulsation wave _pAnd the resonator 20
Experiments were conducted on the pulsation damping effect of. The results are shown in Fig. 3 and
And shown in FIG. The horizontal axis and the vertical axis of FIG. 4 are logarithmic scales.

As shown in FIG. 3, f_p= F_rThen pressure
The force pulsation wave has the best damping characteristics, but f_p= (1 / 1.7
5) f_rIn the case of as well, the damping characteristic of the pressure pulsation wave is good. here
And the fuel flow rate dQ flowing through the neck passage 20b of the resonator 20
The frequency characteristic of / dt is shown in FIG. Resonator 20 is neck
The flow in the passage 20b and the pressure change at the inlet of the resonator 20
Resonance damps pulsation. In other words, of the resonator 20
Fuel flow in the neck passage 20b with respect to pressure change ΔP at the inlet
The larger the amount, the higher the pulsation damping effect. See Figure 3 and Figure 4.
, (1 / 1.75) f_r≤ f_p≦ 1.3f_rWhen d
Q / dt has a large value and the pulsation damping effect is good.
On the contrary, the resonance frequency f_rIs (1 / 1.3) f _p≤ f_r≤
1.75f_pIf the resonator 20 is created so that
The dynamic damping effect is increased. Also for the resonator 21, f_p
F_iInstead, the same relational expression holds.

In the first embodiment, the resonators 20 and 21 are installed on both the fuel supply pipe 3 and the branch supply pipe 8, but in the present invention, the resonator is installed on either the fuel supply pipe or the branch supply pipe. It is also possible. (Second Embodiment) A second embodiment of the present invention is shown in FIG.

The resonator 30 is disposed in the middle of the fuel supply pipe 3 or the branch supply pipe 8, and has an orifice 33 and a resonance chamber 3.
1, the fuel can flow through the orifice 32. The orifice 32 acts as the neck passage of the resonator of the first embodiment, and the space between the orifice 32 and the orifice 33 becomes the resonance chamber 31. By making the flow passage cross-sectional area S ₀ of the orifice 33 sufficiently smaller than the flow passage cross-sectional area S _{r of the} orifice 32, the pressure pulsation wave in the fuel supply pipe 3 or the branch supply pipe 8 can be favorably damped.

Branch supply pipe 8 on the fuel downstream side of the common rail
When the resonator 30 is mounted on the fuel tank, a check valve is not required on the fuel upstream side of the resonator 30, but when the resonator 30 is mounted on the fuel supply pipe 3 on the fuel upstream side of the common rail, the check valve is installed on the high-pressure fuel supply pump to prevent backflow. It is necessary to install a check valve. In the second embodiment, the resonator 30 is mounted so that the resonance chamber 31, the orifice 32, and the orifice 33 of the resonator 30 form a part of the fuel passage formed in the fuel supply pipe 3 or the branch supply pipe 8. It is easy to install the resonator in the space in the engine room, and the degree of freedom in installing the resonator 30 is high.

(Third Embodiment) FIG. 6 shows a third embodiment of the present invention.
Shown in An orifice 41 is formed on the fuel downstream side of the resonator 40, and a check valve 43 is provided so that the fuel upstream side of the resonator 40 can be opened and closed. The check valve 43 is biased by a compression coil spring 44 in the valve closing direction on the fuel upstream side. In the third embodiment, the orifice 41 acts as the neck passage of the first embodiment, and the orifice 41 and the check valve 43 are used.
The space between and becomes the resonance chamber 42. The check valve 43 is
It opens when fuel is supplied, and closes when pressure pulsation waves are reflected to prevent back flow of fuel.

Since the third embodiment has only one orifice as compared with the second embodiment, the pressure loss during fuel supply is small. (Fourth Embodiment) FIG. 7 shows a fourth embodiment of the present invention. An orifice valve 51 is provided on the fuel downstream side of the resonator 50. An orifice 51a is formed in the center of the orifice valve 51 so as to penetrate the orifice valve 51 in the axial direction. The orifice valve 51 is biased to the valve seat 53 by the compression coil spring 52. A check valve 54 is provided on the fuel upstream side of the resonator 50, and is biased by a compression coil spring 55 in the valve closing direction on the fuel upstream side. A space formed between the orifice valve 51 and the check valve 54 becomes a resonance chamber 56. At the time of fuel supply, the orifice valve 51 is opened together with the check valve 54. When the orifice valve 51 opens, not only the fuel flows through the orifice 51a, but also
Fuel can flow through the space formed by the outer peripheral wall of the orifice valve 51 on the radially outer side and the inner wall 57 of the container of the resonator 50. When the pressure pulsation wave is reflected, the orifice valve 51 is seated on the valve seat 53 and the fuel can flow only through the orifice 51a, and the check valve 54 is closed to prevent the backflow of the fuel.

In the fourth embodiment, since the orifice valve 51 is opened at the time of fuel supply and the fuel supply amount can be increased, the pressure loss at the time of fuel supply can be further reduced. (Fifth Embodiment) FIG. 8 shows a fifth embodiment of the present invention. Fifth
In the embodiment, the fuel supply pipe 3 is provided with the resonators 50a and 50b having a check valve having the same structure as the resonator of the fourth embodiment.
And the branch supply pipe 8. When the resonator 50a having a check valve is attached to the fuel supply pipe 3 on the upstream side of the common rail 4, it is not necessary to provide a check valve for backflow prevention in the high-pressure fuel supply pump 1 other than the check valve in the resonator 50a.

When the resonator 50b having a check valve is attached to the branch supply pipe 8 on the fuel downstream side of the common rail 4, the pressure pulsation wave reflected by the injection valve 6 is reflected by the check valve in the resonator 50b and the cross-sectional area expanding action is performed. It is not received and is reflected toward the injection valve 6 in the same phase. Therefore, one cycle of the pressure pulsation wave is 2L _i , and the pulsation frequency f _i is expressed by the following equation 4. Resonance frequency f _r of the resonator 50b is expressed by two numbers of the foregoing.

[0037]

[Equation 4]

The pulsation frequency f _p of the fuel supply pipe 3 and the resonance frequency f _r of the resonator 50a are expressed by equations 3 and 2, respectively. In the fifth embodiment, the resonators 50a and 50b having the same structure as in the fourth embodiment are attached to the fuel supply pipe 3 and the branch supply pipe 8, respectively, but in the present invention, the resonators of the second embodiment and the third embodiment are mounted. A resonator can be attached, and the resonators of the first to fourth embodiments can be used in combination.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a fuel injection device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing the propagation of pressure waves in the branch supply pipe of the first embodiment.

FIG. 3 is a characteristic diagram showing a damping characteristic of a pressure pulsation wave.

FIG. 4 is a characteristic diagram showing a relationship between a pulsation frequency and a flow rate of a resonator.

FIG. 5 is a schematic sectional view showing a resonator according to a second embodiment of the present invention.

FIG. 6 is a schematic sectional view showing a resonator according to a third embodiment of the present invention.

FIG. 7 is a schematic sectional view showing a resonator according to a fourth embodiment of the present invention.

FIG. 8 is a configuration diagram showing a fuel injection device according to a fifth embodiment of the present invention to which the resonator of the fourth embodiment is applied.

FIG. 9 is a configuration diagram showing a conventional fuel injection device.

[Explanation of symbols]

 1 High-pressure fuel supply pump (fuel supply pump) 2 Check valve 3 Fuel supply pipe 4 Common rail 5 Engine 6 Injection valve 7 Electromagnetic valve 8 Branch supply pipe 20 Resonator 20a Resonance chamber 20b Neck passage 21 Resonator 21a Resonance chamber 21b Neck Passage 30 Resonator 31 Resonance chamber 32 Orifice (first orifice) 33 Orifice (second orifice) 40 Resonator 41 Orifice 43 Check valve 44 Compression coil spring (biasing means) 50 Resonator 51 Orifice valve 51a Orifice 52 Compression Coil spring (first urging means) 53 Valve seat 54 Check valve 55 Compression coil spring (second urging means)

Claims (5)

[Claims] 1. A fuel supply pump, a common rail for accumulating fuel supplied from the fuel supply pump, the fuel supply pump and the common rail are connected, and fuel can be supplied from the fuel supply pump to the common rail. A fuel supply pipe having a first fuel passage, an injection valve provided for each cylinder of an internal combustion engine, the common rail and the injection valve are connected, and high-pressure fuel accumulated in the common rail is supplied to the injection valve. A branch supply pipe having a possible second fuel passage, and a resonator having a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe. The fuel injection device, further comprising: a resonator in which the resonance chamber communicates with the fuel passage or the second fuel passage through the neck passage. 2. The fuel injection device according to claim 1, wherein
A resonator having a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, the first fuel passage or the second fuel passage, and the neck portion. A first orifice formed on the fuel downstream side, a second orifice formed on the fuel upstream side, and the first orifice and the first orifice instead of the resonator communicating with the resonance chamber via a passage. A resonator having a resonance chamber formed between the first orifice and the second orifice, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe. The resonance chamber forms a part of the first fuel passage or the second fuel passage, and one of the first orifice and the second orifice includes a resonator having a smaller diameter than the other. Fuel injection device according to claim Rukoto. 3. The fuel injection device according to claim 1, wherein
A resonator having a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, the first fuel passage or the second fuel passage, and the neck portion. Instead of the resonator communicating with the resonance chamber via the passage, a check valve provided on the fuel upstream side and having the fuel upstream side in the valve closing direction and a biasing means for biasing the check valve to the fuel upstream side are provided. A resonator having an orifice on the fuel downstream side and having a resonance chamber formed between the orifice and the check valve, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe. The fuel injector, wherein the orifice and the resonance chamber each include a resonator forming a part of the first fuel passage or the second fuel passage. 4. The fuel injection device according to claim 1, wherein
A resonator having a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, the first fuel passage or the second fuel passage, and the neck portion. Instead of the resonator in which the resonance chamber communicates via a passage, an orifice valve that has an axially penetrating orifice and is provided on the fuel downstream side, and a first biasing unit that biases the orifice valve and the orifice A valve seat with which the valve can come into contact, a check valve provided on the fuel upstream side, and a second urging means for urging the check valve toward the fuel upstream side,
A resonator having a resonance chamber formed between the orifice valve and the check valve, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe,
The fuel injection device, wherein the orifice and the resonance chamber each include a resonator forming a part of the first fuel passage or the second fuel passage. 5. When the frequency of the pressure pulsation wave generated in the first fuel passage or the second fuel passage is f and the resonance frequency of the resonator is f _r , (1 / 1.3) f ≦ f _r
≦ 1.75f, Claims 1, 2, 3
Alternatively, the fuel injection device according to item 4.