JP2000018138A - Flow controller of fluid injection valve and flow control method using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow controller of a fluid injection valve that allows easy and accurate adjustment and reduces the adjustment time, and a flow control method using same. SOLUTION: When removing a fuel injection valve 10, a test fuel is pressure fed to dummy supply means 63 such that a predetermined flow rate of the test fuel is injected through a dummy injection valve 62. This makes it possible to constantly inject the test fuel to either the fuel injection valve 10 or the dummy injection valve 62. Therefore, since a measurement limitation abnormality of flow rate measurement means 52 is able to be prevented, the flow rate control time can be decreased by reducing the time for flow rate measurement. Leakage check also makes it possible to confirm leakage of the test fuel from the junction between fluid supply means 51 and the upper end portion 32a of an adjusting pipe 32. Therefore, as the flow rate of the test fuel passing through the fluid supply means 51 can be accurately measured, the injection amount of the fuel injection valve 10 can be precisely adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device for a fluid injection valve and a flow control method using the same, and more particularly to a fuel injection valve for injecting fuel into an internal combustion engine (hereinafter referred to as an "internal combustion engine"). And a flow rate adjusting method using the same.

[0002]

2. Description of the Related Art As a fuel injection valve of an engine mounted on a vehicle, a contact portion of a needle valve is separated from a valve seat formed on an upstream side of an injection hole of a valve body, or a contact portion is seated on the valve seat. Injecting or shutting off a fluid from an injection hole is known.

[0003] Such a fuel injection valve is generally provided with an injection amount adjusting means capable of adjusting the injection amount of fuel injected from an injection hole. By adjusting the adjusting means, the fuel injection amount is adjusted according to the specifications of the engine. As the injection amount adjusting means, for example, an injection amount adjusting means comprising an adjusting pipe and a spring is known.

[0004]

In a conventional method for adjusting the flow rate of a fuel injection valve, a flow rate measuring method for measuring the flow rate of test oil passing through the oil supply means to oil supply means for supplying test oil to the fuel injection valve. A fuel injector is provided, and the injection amount of the fuel injection valve is adjusted by adjusting the injection amount adjusting means in accordance with a signal from the flow rate measuring device. For this reason, for example, when the difference in the flow rate caused by opening and closing the oil supply means is large, such as when the fuel injection valve is attached / detached, the measurement capability of the flow rate measuring device may be exceeded. If the measurement capability of the flow meter is exceeded, the flow meter will become measurement limit abnormal, and it will take time for the flow meter to return, so it will take time to measure the flow rate and it will take a long time to adjust the flow rate was there.

Further, in the conventional method for adjusting the flow rate of a fuel injection valve, there is a possibility that the test oil is overlooked from the connection between the fuel injection valve and the test oil supply means. If the test oil leaks from the connection between the fuel injection valve and the test oil supply means, the flow rate of the test oil passing through the oil supply means cannot be measured accurately, and the injection amount of the fuel injection valve can be precisely measured. There was a problem that it could not be adjusted.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and a flow rate adjusting device for a fluid injection valve which can be easily adjusted and which can reduce the adjusting time, and a flow rate using the same. It is intended to provide an adjustment method. It is another object of the present invention to provide a flow rate adjusting device for a fluid injection valve capable of precisely adjusting a flow rate and a flow rate adjusting method using the same.

[0007]

According to the flow control device for a fluid injection valve according to the first aspect of the present invention, a fluid supply means for supplying a fluid to the fluid injection valve and a performance equivalent to a master model of the fluid injection valve. And a dummy supply unit that branches from the fluid supply unit and supplies the fluid to the dummy injection valve, and ejects the fluid from the injection hole to inject the fluid according to the flow rate of the fluid passing through the fluid supply unit. The injection amount of the fluid injection valve is adjusted by adjusting the amount adjusting means. For this reason,
For example, when the fluid injection valve is attached / detached, the fluid is always supplied to one of the fluid injection valve and the dummy injection valve by pumping the fluid to the dummy supply unit and injecting a constant flow of the fluid from the dummy injection valve. It is possible. Therefore, for example, by providing a flow measuring device for measuring the flow rate of the fluid passing through the fluid supplying device in the fluid supplying device and adjusting the flow adjusting device in accordance with a signal from the flow measuring device, easily and precisely. The flow rate can be adjusted,
The flow control time can be reduced.

According to a second aspect of the present invention, the fluid injection valve is an electromagnetic injection valve, and the fluid injection valve or the fluid injection valve is driven by driving pulse generating means capable of generating a pulse having a constant period. Activate the dummy injection valve to inject fluid from the fluid injection valve or the dummy injection valve.
Therefore, the flow rate can be easily and precisely adjusted by passing the exciting current to the electromagnetic coil of the fluid injection valve by the drive pulse generating means so that the fluid injection valve performs an operation corresponding to the use condition. The adjustment time can be further reduced.

According to the flow rate adjusting method of the present invention, the fluid is pressure-fed to the fluid supply means for supplying the fluid to the fluid injection valve, branched from the fluid supply means, and is equivalent to the master model of the fluid injection valve. The fluid is pumped to dummy supply means for supplying the fluid to the dummy injection valve having the performance of the above, the fluid is injected from the dummy injection valve at a constant flow rate, and instead of the dummy injection valve, the fluid is injected at a constant flow rate. The injection amount of the fluid injection valve is adjusted by injecting the fluid from the injection hole and adjusting the injection amount adjusting means according to the flow rate of the fluid passing through the fluid supply means. For this reason, for example, when the fluid injection valve is attached or detached, the fluid is always injected to either the fluid injection valve or the dummy injection valve by forcing the fluid to the dummy supply means and injecting a constant flow rate of the fluid from the dummy injection valve. It is possible to do. Therefore, for example, the fluid supply means is provided with a flow rate measuring device for measuring the flow rate of the fluid passing through the fluid supply means, and the injection amount adjusting means is adjusted in accordance with a signal from the flow rate measuring device, so that it is easy and precise. The flow rate can be adjusted quickly, and the flow adjustment time can be reduced.

According to the flow rate adjusting method of the present invention, in the step of injecting a constant flow rate of fluid from the dummy injection valve, the connection between the fluid injection valve and the fluid supply means without injecting the fluid from the injection hole. Check for fluid leakage from parts. For this reason, it can be confirmed that the fluid leaks from the connection between the flow injection valve and the fluid supply means. Therefore, the flow rate of the fluid passing through the fluid supply means, that is, the injection amount of the flow injection valve can be measured more accurately, so that the flow rate of the flow injection valve can be adjusted more precisely.

According to the flow rate adjusting method of the present invention, in the step of injecting a constant flow rate of fluid from the dummy injection valve, the dummy injection valve ejects a constant flow rate of fluid from the injection hole of the fluid injection valve. The fluid is ejected, and air in the fluid supply means and the fluid injection valve is removed. For this reason, for example, even if the fluid supply means is provided with a flow rate measuring device for measuring the flow rate of the fluid passing through the fluid supply means, and the injection amount adjusting means is adjusted according to a signal from the flow rate measuring device, the fluid supply means By discharging the air mixed into the fluid injection valve, it is possible to prevent a measurement limit abnormality of the flow meter. Therefore, the flow measurement time can be reduced, and the flow adjustment time can be further reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. One embodiment in which the present invention is applied to a fuel injection valve of a fuel supply device for a gasoline engine is shown in FIGS. As shown in FIG. 2, a fuel injection valve 10 as a fluid injection valve has one end of a housing 11 resin-molded by a fixed core 12 made of a ferromagnetic material and a connector 41, and the other end thereof to a valve body 13 by laser welding. Have been. A spacer 14 is sandwiched between the housing 11 and the valve body 13. The thickness of the spacer 14 is adjusted so that the air gap between the fixed core 12 and the movable core 30 has a predetermined value.

A needle valve 20 as a valve member is supported by a valve body 13 so as to be able to reciprocate. Needle valve 20
The contact portion 20a having a conical surface formed at the end of the valve body 13 can be seated on the valve seat 13a formed on the inner peripheral wall 13c of the valve body 13. When the contact portion 20a is seated on the valve seat 13a, the injection hole 13b is closed. The joint 21 formed at the other end of the needle valve 20 is laser-welded to the movable core 30, and the needle valve 20 and the movable core 30 are integrally connected. A two-chamfered portion 2 is formed on the outer periphery of the joint portion 21 so as to form a fuel passage between the outer peripheral wall of the movable core 30 and the inner peripheral wall.
1a is provided. The needle valve 20 is supported by the inner peripheral wall 13c of the valve body 13 at the first sliding portion 22 and the second sliding portion 23 so as to be able to reciprocate. A small diameter portion 24 having a smaller diameter than the two sliding portions is formed between the first sliding portion 22 and the second sliding portion 23, and the small diameter portion 24 and the inner peripheral wall 13c are formed.
And a gap 35 through which fuel passes is formed. The first sliding portion 22 and the second sliding portion 23 are formed with four chamfers on the outer peripheral wall, and the fuel passes between the chamfer and the inner peripheral wall 13c.

The movable core 30 is arranged to face the fixed core 12 in the axial direction and to form a predetermined gap with the lower end surface of the fixed core 12. The spring 31 moves the needle valve 20 and the movable core 30 downward in FIG.
0a urges in the direction of sitting on the valve seat 13a.

The adjusting pipe 32 is a fixed core 1
2 is pressed into the inner circumference. The biasing force of the spring 31 can be adjusted by adjusting the press-fitting position of the adjusting pipe 32 after assembly. The adjusting pipe 32 and the spring 31 constitute injection amount adjusting means. The filter 33 is disposed on the upstream side of the adjusting pipe 32. The filter 33 is pumped from a fuel tank by a fuel pump or the like, and removes foreign matter such as dust in the fuel flowing into the fuel injection valve 10.

The electromagnetic coil 40 is wound around an outer periphery of a resin spool 41, and the spool 41 is disposed around the outer periphery of the fixed core 12. When an exciting current flows from the terminal 43 inserted into the connector 42 to the electromagnetic coil 40 via a lead wire (not shown) by an electronic control device (not shown), the needle valve 20 and the movable core 3
0 is attracted in the direction of the fixed core 12 against the urging force of the spring 31, and the contact portion 20a is separated from the valve seat 13a. When the contact portion 20a is separated from the valve seat 13a, the fuel filter 33, the inner circumference of the adjusting pipe 32, the gap between the chamfered portion 21a and the movable core 30, the gap between the second sliding portion 23 and the inner peripheral wall 13c, Fuel is injected from the injection hole 13b through the gap 35, the gap between the first sliding portion 22 and the inner peripheral wall 13c, and the opening between the contact portion 20a and the valve seat 13a.

In a state where the power supply to the electromagnetic coil 40 is off, as shown in FIG. 2, the needle valve 20 and the movable core 30 are urged downward in FIG. Is seated on the valve seat 13a. Thereby, the fuel injection from the injection hole 13b is shut off.

Next, the system configuration of the flow control device for the fuel injection valve 10 having the above configuration will be described with reference to FIG. The flow control device 100 includes a pump 50, a fluid supply unit 51, a flow measurement unit 52, a pressure measurement unit 53,
First switching valve 54, press-fitting means 55, and calculating means 61
A dummy injection valve 62, a dummy supply unit 63, a bypass supply unit 65, a second switching valve 64, a drive pulse generation unit 70, a first switching unit 71, a valve opening signal generation unit 80, 2 switching means 81. FIG.
In the fuel injection valve 10, the filter 33 shown in FIG. 2 is removed.

The fluid supply means 51 is a fluid supply means having a passage for supplying a test oil as a fluid to be pumped from the pump 50 to the fuel injection valve 10. The adjusting pipe 32 extends to the upper end 32a.

The flow rate measuring means 52 is provided in the fluid supply means 51 between a branch point 65a between the fluid supply means 51 and the bypass supply means 65 and a branch point 63a between the fluid supply means 51 and the dummy supply means 63. This is a gear pump type (volume type) flow meter for measuring the flow rate of the test oil passing through the fluid supply means 51 and transmitting it as a pulse signal. The flow rate measuring means 52 is configured to detect and correct the pressure difference between the inlet and the outlet of the flow rate measuring means 52 so that the flow rate of the test oil can be accurately measured.

The pressure measuring means 53 is provided in the fluid supplying means 51 between the junction 65b of the fluid supplying means 51 and the bypass supplying means 65 and the upper end 32a of the adjusting pipe 32. This is for confirming the fluctuation of the pressure of the test oil in the fluid supply means 51 before and after the flow rate measurement.

The first switching valve 54 is provided in the fluid supply means 51 between the junction 63a and the junction 65b, and enables the test oil after passing through the junction 63a to be supplied to the fuel injection valve 10. It is. By switching the first switching valve 54, the test oil pumped from the pump 6 is supplied to the dummy supply unit 6.
It is possible to select either to supply only to the fuel injection valve 3 or to both the fuel injection valve 10 and the dummy supply means 63.

The press-fitting means 55 is a press-fitting means for press-fitting the adjusting pipe 32 into the fixed core 12, and includes a motor 56, gears 57 and 58, and a nut 59.
And a screw 60. The motor 56 is for transmitting the rotational force of the motor 56 to the screw 60,
It is electrically connected to the calculating means 61. The gears 57 and 58 are gears for transmitting the rotational force from the motor 56 to the screw 60. The gear 57 is fixed to a driving force output shaft of a motor 56, and the gear 58 is fixed to a screw 60. Since the nut 59 is fixed by a fixing member (not shown), the screw 60 can be moved in the arrow Z direction shown in FIG. By moving the screw 60 in the direction of the arrow Z, the press-fitting position of the adjusting pipe 32 is adjusted, the urging force of the spring 31 is adjusted, and the injection amount of the fuel injection valve 10 is adjusted.

The arithmetic means 61 is an arithmetic means which receives a pulse signal from the flow rate measuring means 52, counts the number of pulses in a certain fixed time, calculates, and gives a rotation command to the motor 56.

The dummy injection valve 62 is a dummy injection valve having the same performance as the master model of the fuel injection valve 10,
It has the same configuration as the fuel injection valve 10. In the dummy injection valve 62, the adjustment of the injection amount has already been completed.

The dummy supply means 63 includes a flow rate measurement means 52
This is a supply unit that branches off from the fluid supply unit 51 at a branch point 63 a between the fluid supply unit 51 and the first switching valve 54, and has a passage for supplying test oil pumped from the pump 6 to the dummy injection valve 62.

The bypass supply means 65 is connected to the fluid supply means 5 at a branch point 65a between the pump 50 and the flow rate measurement means 52.
1 and joins the fluid supply unit 51 at a junction 65b between the first switching valve 54 and the pressure measurement unit 53. The bypass supply unit 65 includes the flow rate measurement unit 5.
2. The test oil pumped from the pump 6 bypassing the dummy supply means 63 and the first switching valve 54 is supplied to the fuel injection valve 10
This is a supply unit having a bypass passage for supplying the air to the supply passage.

The second switching valve 64 is provided in the middle of the bypass supply means 65, and is used for forming a bypass circuit for the test oil passing through the bypass supply means 65 by switching.

The driving pulse generating means 70 operates the fuel injection valve 10 in accordance with the conditions of use, that is, the same operation as when mounted on a vehicle.
Is a driving pulse generating means for generating a driving pulse for causing an exciting current to flow through the electromagnetic coil 40. The drive pulse generating means 70 can supply an exciting current to an electromagnetic coil (not shown) of the dummy injection valve 62 by switching the first switching means 71.

The first switching means 71 is provided between the driving pulse generating means 70 and the second switching means 81, and outputs the driving pulse generated by the driving pulse generating means 70 to the fuel injection valve 10 and the dummy injection valve 62. It is possible to select and supply either one of these. As shown in FIG. 1, when the terminal 71a on the fuel injection valve 10 side is connected, a drive pulse can be supplied to the fuel injection valve 10, and the terminal 71b on the dummy injection valve 62 side is connected. Then, the drive pulse can be supplied to the dummy injection valve 62. The valve-opening signal generating means 80 is a valve-opening signal generating means for generating a valve-opening signal for supplying an exciting current to the electromagnetic coil 40 so that the fuel injection valve 10 is opened.

The second switching means 81 is provided between the first switching means 71 and the electromagnetic coil 40, and includes a driving pulse generated by the driving pulse generating means 70 and an opening signal generated by the valve opening signal generating means 80. An excitation current can be supplied to the electromagnetic coil 40 by selecting one of the valve signals. FIG.
As shown in the figure, when the drive pulse generating means 70 terminal 81a is connected, a drive pulse can be supplied to the fuel injection valve 10, and the terminal 81b on the valve opening signal generating means 80 side is connected. Then, a valve opening signal can be supplied to the fuel injection valve 10.

Next, the operation of the flow control device 100 having the above configuration will be described with reference to FIGS. 1, 3 and 4. (1) In step S1 of FIG. 4, as shown in FIG.
By switching the first switching valve 54 and the second switching valve 64, the test oil supplied from the pump 50 to the fluid supply unit 51 is supplied to the dummy supply unit 63 in order to supply the test oil to the dummy injection valve 62. The terminal 71b of the first switching unit 71 on the side of the dummy injection valve 62 is connected to supply the drive pulse of the drive pulse generation unit 70 to the dummy injection valve 62, and the exciting current is supplied to the electromagnetic coil of the dummy injection valve 62 to perform the dummy injection. The needle valve (not shown) of the valve 62 is reciprocated. Then, in step S2 of FIG. 4, it is confirmed that the injection amount of the dummy injection valve 62 is within a certain flow rate range.

(2) In step S3 of FIG. 4, the fuel injection valve 10 is installed as shown in FIG. And FIG.
In step S4, the first switching valve 54 is switched, and the pressure of the test oil is checked by the pressure measuring means 53 while the exciting current flows through the electromagnetic coil of the dummy injection valve 62.

(3) In step S5 of FIG. 4, the fluid supply means 51 and the upper end 32 of the adjusting pipe 32
Check the leakage of the test oil at the connection with a. At this time, if the test oil is not leaking from the connection portion, the dummy injection valve 62 has the same performance as the master model of the fuel injection valve 10, so that the flow measurement value of the flow measurement unit 52 is adjusted to the target adjustment value. It is within the flow rate range. Therefore, even if the first switching valve 54 is switched so that the test oil is supplied to the fuel injection valve 10 side, the setup can be performed smoothly without exceeding the limit flow rate measurement area of the flow rate measurement means 52, that is, without measurement abnormality. Becomes When the test oil leaks from the connection between the fluid supply unit 51 and the upper end 32a of the adjusting pipe 32, the flow measurement unit 52 recognizes that the flow measurement value is out of the target adjustment flow range. By using the dummy injection valve 62, a measurement abnormality can be confirmed as a leak check.

(4) In step S 6 in FIG. 4, the second switching valve 64 is switched to remove the mixed air in the fluid supply means 51 and the fuel injection valve 10, and the test oil passes through the bypass supply means 65. . Then, the terminal 81b of the second switching means on the valve opening signal generating means 80 side is connected, and the valve opening signal generated by the valve opening signal generating means 80 is supplied to the fuel injection valve 10.
And an exciting current is supplied to the electromagnetic coil 40 so that the test oil is injected from the fuel injection valve 10 for a certain time. After a certain period of time, the air mixed in the fluid supply means 51 and the fuel injection valve 10 can be discharged by the test oil supplied through the bypass supply means 65. The above series of operations is called static flushing. Using the bypass supply means 65,
By performing the static flushing by bypassing the flow rate measuring means 52, the variation in the flow rate due to the air discharge does not increase, and the so-called measurement limit abnormality exceeding the measuring capability of the flow rate measuring means 52 can be prevented. .

(5) The second switching valve 64 is switched again, and the bypass supply means 65 is closed. Then, the first switching valve 54 is switched so that the test oil passes through the fluid supply means 51 and is supplied to the fuel injection valve 10. At this time, the terminal 71a of the first switching means 71 on the side of the fuel injection valve 10 is connected, and the driving pulse generating means 70 of the second switching means 81 is connected.
The terminal 81a on the side is connected, an exciting current flows through the electromagnetic coil 40, and the needle valve 20 is reciprocated. The above series of operations is called dynamic flushing. By performing the dynamic flushing, the flow rate measurement can be stabilized.

(6) In step S7 of FIG. 4, continuous flow rate adjustment is performed. This adjusting method will be further described with reference to FIGS. (6-1) In step S71 of FIG. 5, the control waits for a fixed time to stabilize the injection immediately after flushing, that is, to stabilize the flow rate measuring means 52. (6-2) In step S72 in FIG. 5, the motor 56 is driven to rotate at a constant speed, and the adjusting pipe 32 is pressed by moving the screw 60 in the arrow Z direction shown in FIG.

(6-3) In step S73 of FIG. 5, when the specified flow rate 1 shown in FIG. 6 is reached, a deceleration signal is given to the motor 56 by the calculating means 61, and the screw speed is reduced while the driving speed of the motor 56 is reduced. The adjusting pipe 32 is pressed by 60. (6-4) When the specified flow rate 2 shown in FIG. 6 is reached in step S74 of FIG. 5, a stop signal is given to the motor 56 to stop the driving of the motor 56 in step S75 of FIG. The movement and the pressing of the adjusting pipe 32 are stopped.

The above is the flow of the continuous flow rate adjusting method. In this embodiment, a pulse signal from the flow rate measuring means 52 is input by the calculating means 61, and the time, which is the pulse width of the pulse signal, is measured and confirmed as a flow rate. Give a directive,
A series of operations of pressing the adjusting pipe 32 by the press-fitting means 55 are continuously performed in parallel. In addition,
In the above continuous flow rate adjusting method, the specified flow rate 1 and the specified flow rate 2 are obtained by experiments and the like.

(7) In step S8 of FIG. 4, it is determined whether or not the target adjusted flow rate has been reached. If the upper limit of the target adjusted flow rate has not been reached, in step S9 of FIG.
Fine adjustment by continuous flow adjustment. In step S10 of FIG. 4, if the fuel injection valve 10 has reached the target adjustment flow rate range, the fuel injection valve 10 is detached and replaced with the next unadjusted fuel injection valve. In addition, a fuel injection valve exceeding the lower limit of the target adjustment flow rate is excluded as a defective product.

Next, according to the embodiment shown in FIG. 1, the first switching valve 54, the dummy injection valve 62, the dummy supply means 63, the bypass supply means 65, the second switching valve 64, the first switching means 71, the valve opening signal Generating means 80 and second switching means 81
A comparative example of the configuration from which the above has been removed will be described with reference to FIG. FIG.
In the comparative example shown in FIG. 7, the same components as those in the first embodiment shown in FIG.

As shown in FIG. 7, the flow control device 200
Is composed of a pump 50, a fluid supply unit 51, a flow measurement unit 52, a pressure measurement unit 53, a press-fit unit 55, a calculation unit 61, and a drive pulse generation unit 70.

In the comparative example, when the flow rate fluctuation difference caused by opening and closing the fluid supply means 51 is large, such as when the fuel injection valve 10 is attached / detached, the measurement capability of the flow rate measurement means 52 may be exceeded. If the measurement capability of the flow rate measuring means 52 is exceeded, the flow rate measuring means 52 becomes a measurement limit abnormality and it takes time for the flow rate measuring means 52 to return, so it takes time to measure the flow rate, and it takes a long time to adjust the flow rate. It costs. For example, when the drive pulse signal from the drive pulse generating means 70 is set to 100 Hz and 2.5 ms,
Was driven to inject test oil, and the flow rate of the fuel injection valve 10 was adjusted. As a result, an adjustment time of 27 sec was required.

On the other hand, in this embodiment, the fuel injection valve 1
At the time of desorption of the fuel injection valve 10 or the dummy injection valve 62, the test oil is supplied to the dummy supply means 63 by pressure and the test oil is injected from the dummy injection valve 62 at a constant flow rate.
It is possible to always inject the test oil to either one of the two. Therefore, the measurement limit abnormality of the flow rate measuring means 52 can be prevented, so that the flow rate measurement time can be reduced and the flow rate adjustment time can be reduced. For example, the drive pulse signal from the drive pulse generation means 70 is set to 100 Hz,
The fuel injection valve 10 was driven under the condition of 2.5 ms to perform test oil injection, and the flow rate of the fuel injection valve 10 was adjusted.
The flow rate could be adjusted by ec. That is, in the present embodiment, the flow rate of the fuel injection valve 10 can be adjusted in a short time that is twice or more that of the comparative example.

In the comparative example, the fluid supply means 51
There is a risk of overlooking that the test oil is leaking from the connection between the adjusting pipe 32 and the upper end 32a of the adjusting pipe 32. If the test oil leaks from the above connection, the flow rate of the test oil passing through the fluid supply means 51 cannot be accurately measured, and the injection amount of the fuel injection valve 10 cannot be precisely adjusted.

On the other hand, in the present embodiment, by performing a leak check, it is possible to confirm that the test oil leaks from the connection between the fluid supply means 51 and the upper end 32a of the adjusting pipe 32. Therefore, since the flow rate of the test oil passing through the fluid supply means 51 can be accurately measured, the injection amount of the fuel injection valve 10 can be precisely adjusted.

Further, in this embodiment, by performing the static flushing, the air mixed in the fluid supply means 51 and the fuel injection valve 10 is discharged, thereby preventing the measurement limit abnormality of the flow rate measurement means 52. be able to. Therefore, the flow control time can be further reduced.

Further, in this embodiment, the fuel injection valve 10 or the dummy injection valve 62 is operated by the drive pulse generation means 70 capable of generating a pulse of a fixed period.
The test oil is injected from the fuel injection valve 10 or the dummy injection valve 62. Therefore, the flow rate can be easily and precisely adjusted by supplying an exciting current to the electromagnetic coil 40 by the drive pulse generating means 70 so that the fuel injection valve 10 performs an operation corresponding to the use condition. Time can be further reduced.

In this embodiment, the present invention is applied to the adjustment of the injection amount of the electromagnetic fuel injection valve 10, but the present invention may be applied to the adjustment of the injection amount of a mechanical or magnetic injection valve. In this embodiment, the screw 60 is used for the press-fitting means 55. However, in the present invention, a rack pinion, a hydraulic servo, a linear motor, or the like may be used for the press-fitting means.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a fuel injection valve flow control device according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a fuel injection valve according to one embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining a method of adjusting a flow rate of a fuel injection valve according to one embodiment of the present invention.

FIG. 4 is a flowchart illustrating a method for adjusting a flow rate of a fuel injection valve according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating a method of adjusting a flow rate of a fuel injection valve according to an embodiment of the present invention.

FIG. 6 is a time chart for explaining a method of adjusting a flow rate of a fuel injection valve according to an embodiment of the present invention.

FIG. 7 is a schematic view showing a fuel injection valve flow control device according to a comparative example.

[Description of Signs] 10 Fuel injection valve (fluid injection valve) 13 Valve body 13a Valve seat 13b Injection hole 20 Needle valve (valve member) 20a Contact portion 31 Spring (injection amount adjusting means) 32 Adjusting pipe (injection amount adjustment) Means) 40 electromagnetic coil 51 fluid supply means 52 flow rate measurement means 54 first switching valve 55 press-fitting means 62 dummy injection valve 63 dummy supply means 64 second switching valve 65 bypass supply means 70 drive pulse generation means 71 first switching means 80 open Valve signal generating means 81 Second switching means

Claims (5)

[Claims] 1. A valve body having a valve seat provided on a fluid upstream side of an injection hole, and a contact portion supported reciprocally by the valve body and capable of seating on the valve seat. A valve member that ejects or shuts off the fluid from the injection hole by separating from the valve seat and sitting on the valve seat, and an injection amount adjustment unit that can adjust the injection amount of the fluid injected from the injection hole. An apparatus for adjusting a flow rate of a fluid injection valve comprising: a fluid supply unit that supplies fluid to the fluid injection valve; a dummy injection valve having performance equivalent to a master model of the fluid injection valve; A dummy supply unit for branching from a supply unit and supplying a fluid to the dummy injection valve, wherein the injection amount adjusting unit is configured to cause the fluid to be injected from the injection hole and to flow according to a flow rate of the fluid passing through the fluid supply unit. By adjusting the Flow control device of a fluid injection valve and adjusts the injection amount of the valve. 2. The fluid injection valve is an electromagnetic injection valve, comprising a drive pulse generating means capable of generating a pulse having a constant period, and operating the fluid injection valve or the dummy injection valve by the drive pulse generation means. The flow control device for a fluid injection valve according to claim 1, wherein fluid is injected from the fluid injection valve or the dummy injection valve. 3. A flow rate adjusting method using the flow rate adjusting device for a fluid injection valve according to claim 1, wherein a step of pumping the fluid to the fluid supply unit and a step of pumping the fluid to the dummy supply unit. A step of injecting a constant flow rate of fluid from the dummy injection valve; and injecting a fluid from the injection hole without injecting a constant flow rate of fluid from the dummy injection valve, and a fluid passing through the fluid supply unit. Adjusting the injection amount of the fluid injection valve by adjusting the injection amount adjusting means in accordance with the flow rate of the fluid. 4. In the step of injecting a fixed flow rate of fluid from the dummy injection valve, a fluid leak from a connection portion between the fluid injection valve and the fluid supply means is confirmed without injecting fluid from the injection hole. 4. The method according to claim 3, further comprising a step. 5. The step of injecting a constant flow rate of fluid from the dummy injection valve includes the step of injecting fluid from the injection hole to remove air in the fluid supply means and the fluid injection valve. The flow rate adjusting method according to claim 3, wherein