JP3317850B2 - Injection valve lift adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example relates to the lift amount regulating advice service location suitable injector with the injection valve for injecting fuel into an engine of an automobile or the like, in particular, adjusting the lift amount of the valve body The present invention relates to an injection valve lift amount adjusting device that adjusts an injection amount.

[0002]

2. Description of the Related Art In general, in an engine of an automobile or the like, an injection pulse width input to a fuel injection valve is controlled in accordance with an operation state of the engine, so that the injection valve has a predetermined injection amount corresponding to the injection pulse width. Inject fuel into each cylinder of the engine.

In a fuel injection valve of this type according to the related art, a valve body is provided in a valve casing so as to be opened and closed.
When driven by an electromagnetic actuator or the like, the valve element separates and seats on a valve seat member fixed to one end of the valve casing. When an injection pulse signal is input to the electromagnetic actuator or the like, the valve body separates (lifts) from the valve seat for a time corresponding to the injection pulse width, so that the amount of fuel substantially proportional to the injection pulse width is increased. Is injected outside.

However, since the amount of fuel injected with respect to the injection pulse width has manufacturing variations, it is necessary to strictly adjust the characteristics of the injection valve during manufacture. Thus, prior to shipment of the injection valve, the injection amount (flow rate) is adjusted.

[0005] Here, this flow rate adjusting device comprises a base on which an injection valve to be adjusted is mounted, a test liquid tank for supplying a test liquid to the injection valve, and a flow meter for measuring the injection amount (flow rate) of the injection valve. And a pusher mechanism for externally pressurizing the valve seat side of the injection valve, and a controller and the like for controlling these.

In the adjustment work for adjusting the flow rate of the injection valve, when a worker or the like operates the flow rate adjusting device after mounting the injection valve in a liquid-tight state on the base, the test liquid in the test liquid tank is injected. It is supplied into the valve and flows out of the injection port of the injection valve to the outside. At this time, the flow rate of the test solution is measured by a flow meter and input to the controller.

[0007] The controller drives and controls the pusher mechanism by a predetermined feed amount based on the measurement result of the flow meter, plastically deforms the injection valve by pressurizing the valve seat side, and together with the lift amount of the valve body, the test liquid. To change the flow rate.
Therefore, the controller adjusts the flow rate of the injection valve to a predetermined standard value by repeatedly driving the pusher mechanism several times based on the measurement result of the flow meter.

[0008]

In the above-described prior art, the flow rate is adjusted by actually flowing the test liquid through the injection valve.
A test liquid tank, a supply mechanism that supplies and stops the test liquid from the test liquid tank toward the base, and a return mechanism that returns the test liquid flowing out of the injection port of the injection valve to the test liquid tank, for example, are required. In addition, a seal mechanism for maintaining the injection valve in a liquid-tight state is required at the mounting portion of the base on which the injection valve is mounted, and there is a problem that the flow rate adjusting device becomes complicated and large.

At least before and after the adjustment work,
For example, it is necessary to replenish the test liquid in the test liquid tank or wipe off the test liquid leaking near the base when attaching and detaching the injection valve. Therefore, it takes time to maintain and prepare the flow control device. There is a problem.

Further, in the prior art, once the controller drives the pusher mechanism to change the flow rate of the injector once,
Since the pusher mechanism cannot be drive-controlled based on the flow rate until the flow rate after the change reaches the steady state, the control interval of the pusher mechanism by the controller becomes longer,
There is a problem that it takes time to adjust the flow rate.

The present invention has been made in view of the above-mentioned problems of the prior art. By adjusting the injection amount of the injection valve as the lift amount of the valve body, the adjustment device can be simplified, and the maintenance performance can be improved. It is another object of the present invention to provide a lift adjusting device for an injection valve, which can efficiently adjust a lift amount of a valve body.

[0012]

According to the present invention, there is provided a pusher mechanism for variably adjusting a lift amount of a valve body by pressurizing a valve seat side of an injection valve. Lift amount measuring means for measuring a lift amount of the valve body by detecting a valve opening position and a valve closing position; a measurement result by the lift amount measuring means; and a standard value of a predetermined lift amount of the valve body And an initial adjustment amount calculating means for calculating an initial adjustment amount of the lift amount to be adjusted, and a drive control of the pusher mechanism based on the initial adjustment amount by the initial adjustment amount calculation means, and the valve of the injection valve is controlled by the pusher mechanism. First pusher control means for initially pressurizing the seat side, and the pusher machine based on at least the lift amount of the valve element measured by the lift amount measurement means after the initial pressurization by the first pusher control means. A target feed amount calculating means for calculating the target feed amount of the fuel injection valve; and a second control means for controlling the driving of the pusher mechanism by the target feed amount by the target feed amount calculating means and pressurizing the valve seat side of the injection valve by the pusher mechanism. And the pusher control means of (1).

The first aspect of the present invention is characterized in that the pusher mechanism is provided with a pressing force detecting means for detecting a pressing force of the injection valve on a valve seat side, and the initial adjustment amount calculating means is provided. An initial pressure on the valve seat side of the injection valve is obtained as an initial adjustment amount based on the lift amount in the initial state by the lift amount measurement means and the standard value, and the first pusher control means When the pressure value detected by the detecting means reaches the initial pressure, the driving of the pusher mechanism is stopped.

Accordingly, the initial adjustment amount calculating means can calculate the initial adjustment amount of the lift amount based on the measurement result of the lift amount of the valve element measured by the lift amount measurement means and the standard value of the lift amount. The pusher control means can initially pressurize the valve seat side of the injection valve by the pusher mechanism based on the calculation result of the initial adjustment amount, and the initial pressurization can adjust the lift amount of the valve body to a value close to the standard value. . Further, since the target feed amount calculating means can calculate the target feed amount of the pusher mechanism based on the lift amount of the valve body measured after the initial pressurization,
The second pusher mechanism control means can drive-control the pusher mechanism based on the calculation result of the target feed amount, and can perform feedback control of the pusher mechanism so that the lift amount of the valve body becomes a standard value.

In addition, since the initial adjustment amount calculating means can set the initial pressing force to the valve seat side by the pusher mechanism based on the lift amount of the valve body in the initial state and the standard value, the first pusher control means When the pressure value detected by the pressure detection means reaches the initial pressure, the driving of the pusher mechanism is stopped, and the lift amount of the valve body can be initially adjusted to a value close to the standard value.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

[0017] Here, FIGS. 1 to 3 show the actual施例of the present invention.

In the drawing, reference numeral 1 denotes an injection valve to be adjusted by the lift amount adjusting apparatus according to the present embodiment. The injection valve 1 has a substantially cylindrical valve casing 2, and the valve casing 2 has an inside thereof. Inflow ports 2A, 2A and return port 2 for inflow and outflow of fuel
B is provided. The distal end surface of the valve casing 2 is a contact surface 2C with which the anchor plate 10 abuts when a valve body 8 described later is opened.

Reference numeral 3 denotes a solenoid as an electromagnetic actuator built in the valve casing 2;
Is fixed to the outer periphery on the distal end side of the core tube 4 extending in the axial direction in the valve casing 2. When an injection pulse signal is input from the outside, the solenoid 3 is excited by this to generate a magnetic force from the tip side of the core cylinder 4 toward the anchor plate 10.

Reference numeral 5 denotes a nozzle holder which constitutes a part of the valve casing 2. The nozzle holder 5 is formed in a stepped cylindrical shape from a metal material or the like, and is fixed to the outer periphery of the valve casing 2 on the distal end side by means such as caulking. ing. A valve seat member 6 described later is fixed to the inner periphery of the tip end side of the nozzle holder 5, and an outer peripheral side of the fixed position is a valve seat that is deformed when the valve seat member 6 is pressed by a pusher 12 A described later. It is a deformed portion 5A on the 6A side.

Reference numeral 6 denotes an annular valve seat member fixed to the inner periphery of the tip end side of the nozzle holder 5. At the upper end side of the valve seat member 6, a valve seat 6A for separating and seating the valve body 8 is formed in a concavely curved shape. Is formed. An injection nozzle 7 for injecting fuel in the valve casing 2 to the outside when the valve body 8 is opened is fixed to the inner peripheral side of the valve seat member 6.

Numeral 8 denotes a hemispherical valve element which is disposed between the valve casing 2 and the nozzle holder 5 and is displaceable in the up-down direction. To the valve seat 6 of the valve seat member 6 in the closed state.
Sitting on A. When the valve 8 is opened by being driven by the solenoid 3, the anchor plate 10 is displaced upward until the anchor plate 10 contacts the contact surface 2 </ b> C of the valve casing 2, and the displacement at this time is the lift of the valve 8. L.

Reference numeral 10 denotes an anchor plate fixed to the back side of the valve body 8. The anchor plate 10 is formed in a substantially annular shape with a magnetic material or the like, and is generated on the tip end side of the core cylinder 4 when the solenoid 3 is excited. The magnetic force is sucked upward together with the valve element 8 and displaces the valve element 8 in the valve opening direction.

Reference numeral 11 denotes a cylindrical adjusting cylinder for adjusting the spring load of the valve spring 9. The adjusting cylinder 11 is fitted on the inner peripheral side of the core cylinder 4. The inner peripheral side of the adjusting cylinder 11 is a through hole 11A facing the valve body 8 from the outside of the injection valve 1, and this through hole 11A is a cover (not shown) except when adjusting the lift amount of the valve body 8. And the like.

Thus, when an injection pulse signal is input from the outside to the solenoid 3, the injection valve 1 opens the valve element 8 by the suction of the anchor plate 10 into the core cylinder 4, and the valve body 8 opens from the inflow port 2A. Part of the fuel flowing into the valve casing 2 is injected from the injection nozzle 7 to the outside.

On the other hand, reference numeral 12 denotes a pusher mechanism which constitutes a lift adjusting device for the injection valve 1 according to the present embodiment. The pusher mechanism 12 is a base (not shown) of the lift adjusting device for mounting the injection valve 1. It is provided in. Further, the pusher mechanism 12 is provided with a cylindrical pusher 12A as a movable part that can move in the vertical direction. The pusher 12A is provided via a power transmission mechanism (not shown) such as a precision ball screw capable of fine feed. It is driven by a pusher motor 13 described later and the like, and presses upward a valve seat member 6 of the injection valve 1 attached to the base.

Reference numeral 13 denotes a pusher motor as a pusher driving means. The pusher motor 13 is constituted by, for example, a stepping motor, and as shown in FIG. 2, a pusher of the pusher mechanism 12 is driven by a drive signal output from a controller 17 described later. 12A is sent upward by a desired amount of movement or returned downward.

Numeral 14 designates a valve element position detector for detecting the position of the valve element 8. The valve element position detector 14 is provided with a rod-shaped measuring element 14A movably in the vertical direction as shown in FIG. Have been. When the lift amount of the injection valve 1 is adjusted, the tracing stylus 14A is inserted into the through-hole 11A of the injection valve 1, and the tip end thereof contacts the rear surface of the valve body 8 so as to follow the valve body 8 and move up and down. Displace in the direction. Thereby, the valve body position detector 14 detects the vertical position of the valve body 8 as the position of the tracing stylus 14 </ b> A, and outputs a detection signal to the controller 17.

Reference numeral 15 denotes a pusher position detector for detecting the position of the pusher 12A. The pusher position detector 15 detects the position of the pusher 12A in the vertical direction as shown in FIG. Output.

Reference numeral 16 denotes a pressure detector as pressure detection means for detecting a pressure applied by the pusher 12A. The pressure detector 16 is constituted by, for example, a pressure sensor such as a load cell, and the pusher 12A is a valve seat member of the injection valve 1. 6 is detected as a pressing force of the pusher 12 </ b> A, and a detection signal is output to the controller 17.

Reference numeral 17 denotes a controller serving as a control unit of the lift amount adjusting device. As shown in FIG. 2, the controller 17 has a storage area 17 composed of, for example, a ROM and a RAM.
A is configured by a microcomputer provided with A. Then, in the storage area 17A, a program for the lift amount adjustment processing shown in FIG.
And data tables shown in Tables 1 and 2 for calculating the correction coefficient a. A valve element position detector 14, a pusher position detector 15 and a pressure detector 16 are connected to the input side of the controller 17, and the solenoid 3 of the injection valve 1 and the pusher motor 13 are connected to the output side of the controller 17. Is connected.

Then, the controller 17 measures the lift amount L from the valve opening position and the valve closing position of the valve body 8 detected by the valve body position detector 14, and based on the measured lift amount, the pusher motor By controlling the drive of the valve 13, the lift amount L of the valve body 8 is adjusted so as to be a predetermined standard value L0.

The lift adjusting device for the injection valve 1 according to the present embodiment has the above-described configuration. Next, the lift adjusting process will be described with reference to FIG.

First, an operator or the like attaches the injection valve 1 to the base of the lift amount adjusting device, and then pushes the pusher 12A of the pusher mechanism 12 against the valve seat member 6 of the injection valve 1 from below. Further, the tracing stylus 14A of the valve body position detector 14 is inserted into the through hole 11A of the injection valve 1, and the tip end thereof is brought into contact with the back side of the valve body 8.

Then, when the controller 17 is operated, the controller 17 starts a lift amount adjustment process. In step 1, the controller 17 measures an initial lift amount L1 of the valve body 8 as a first lift amount measurement step. That is, the valve body position detector 1
After reading the detected valve closing position of the valve element 8, the solenoid 3 is driven to open the valve element 8, and in this state, the valve element 8 is opened.
Is newly read, the lift amount L of the valve body 8 is measured from the difference between the valve opening position and the valve closing position,
The measurement result is stored as the initial lift amount L1 in the unadjusted state (initial state) of the valve body 8.

Next, in step 2, the difference ΔL between the initial lift amount L1 and the standard value L0 is calculated as follows:

[0037]

## EQU1 ## Obtained as ΔL = L1−L0.

Here, the standard value L0 is a standard value of the lift amount of the valve body 8 which is predetermined so that the injection valve 1 injects a fuel with a predetermined injection amount, and is set to, for example, about 60 μm. I have. Then, the lift amount of the injection valve 1 is within a predetermined standard range (for example, L0 ± 5 μm) from the standard value L0.
m).

Next, in step 3, an initial pressurizing force P when the valve seat member 6 of the injection valve 1 is pressurized by the pusher 12A in an initial pressurizing step described later is initially calculated from the following Table 1 by an initial adjustment amount calculating step. The initial pressure P is calculated based on the difference ΔL between the lift amounts from a data table stored in the storage area 17A in advance. That is,
An appropriate initial pressing force P is set to deform the deformed portion 5A of the injection valve 1 by the lift amount difference ΔL.

[0040]

[Table 1]

In this case, assuming that the initial lift amount L1 is 85 μm, the difference ΔL = 25 μm in the lift amount, so that the initial pressure P is obtained as 60 kg.

In step 4, the pusher motor 13 is driven to drive the pusher 12A to the injection valve 1
, And an initial pressurizing step is performed as a first pressurizing step in which the valve seat member 6 is initially pressurized by the pusher 12A. Then, when the pressure detection value of the pusher 12A detected by the pressure detector 16 reaches the initial pressure P, the drive of the pusher motor 13 is stopped to end the initial pressurization step, and the pusher 12A is moved to its position. Hold with.

As a result, the deformed portion 5A of the nozzle holder 5 is deformed upward in response to the initial pressure P, and the valve seat member 6 (valve seat 6A) is pushed in the valve opening direction of the valve body 8, and 8 is reduced to a value close to the standard value L0. Therefore, in step 5, the lift amount L of the valve body 8 at this time is measured by the second lift amount measurement step in the same procedure as in step 1, and the measurement result is applied by the valve seat member 6 to the initial pressurization by the pusher 12A. It is stored as the pressurized lift amount L2 in the pressed state.

Subsequently, in step 6, the pusher motor 13 is reversely driven to return the pusher 12A downward with a return amount B of, for example, about 200 μm.
The injection valve 1 is separated from the valve seat member 6. As a result, since the deformed portion 5A of the nozzle holder 5 is restored (spring back) by the elastic force, the valve seat member 6 is displaced downward, and the lift amount of the valve body 8 is increased from the pressurized lift amount L2.

Therefore, in step 6, the lift amount at this time is measured by the third lift amount measurement step, and the measurement result is changed from the initial pressurized state by the pusher 12A to the valve seat member 6.
Is stored as the lift amount L3 at the time of opening in the state in which it is opened. As a result, the lift amount of the valve body 8 is adjusted from the initial lift amount L1 to the opening lift amount L3 by the initial pressurizing step.

Next, in step 7, it is determined whether or not the opening lift amount L3 falls within a predetermined standard range (for example, L0 ± 5 μm) based on the standard value L0 of the lift amount. When it is determined "YES" in step 7, the process proceeds to step 8 to end the lift amount adjustment processing of the injection valve 1, and the worker removes the injection valve 1 from the base of the lift amount adjustment device. Another injection valve 1 to be newly adjusted is mounted on the base.

On the other hand, if "NO" is determined in step 7, it is necessary to further adjust the opening lift amount L3 of the valve body 8, so that the process proceeds to the target feed amount calculation process shown in steps 9 to 13, and will be described later. The target feed amount Y1 to which the pusher 12A is to be fed in the adjusting and pressurizing step is calculated.

That is, in step 9, the remaining adjustment amount A1 of the lift amount to be newly adjusted in the adjustment pressurization step is determined based on the lift amount L3 at the time of opening after the initial pressurization step and the standard value L0 of the lift amount.

[0049]

## EQU2 ## In step 10, in step 10, the amount of springback S in which the nozzle holder 5 (deformation portion 5A) springs back when the pusher 12A is returned in step 6 is determined by the above-described lift during pressurization. Based on the amount L2 and the lift amount L3 when opening,

[0050]

Calculate as S = L3−L2. In this case, the lift amount under pressure L2 = 58
If the opening lift amount L3 is 73 μm, the springback amount S is 15 μm.

In step 11, the plastic deformation D of the deformed portion 5A of the nozzle holder 5 in the initial pressurizing step is determined by the initial lift L1 and the open lift L3 after the initial pressurizing step. By comparing

[0052]

Calculate as D = L1−L3.

Further, in step 12, the correction coefficient a of the remaining adjustment amount A1 is converted into the remaining adjustment amount A1 and the plastic deformation amount D from the data table of the correction coefficient a according to Table 2 previously stored in the storage area 17A. Calculate based on Here, the correction coefficient a is a correction coefficient determined based on experimental data and the like in order to plastically deform the nozzle holder 5 and the like by the remaining adjustment amount A1.

[0054]

[Table 2]

In this case, using the specific examples of the standard value L0, the initial lift amount L1, and the lift amount L3 at the time of opening, the remaining adjustment amount A1 = 13 μm and the plastic deformation amount D = 12 μm.
m, it is obtained as the correction coefficient a = 2.63. The data table of the correction coefficient a described above is an example in which the initial pressing force P = 60 kg in step 3 is used.
Are provided in accordance with the value of.

Then, in step 13, the pusher 12
The target feed amount Y1 of A is calculated based on the remaining adjustment amount A1, the springback amount S, the plastic deformation amount D, the correction coefficient a, and the return amount B of the pusher 12A in step 6.

[0057]

Calculated as Y1 = A1 * a + S + B, and the feed amount for feeding the pusher 12A toward the valve seat member 6 from the state returned in step 6 is obtained. That is, according to the specific example described above, the target feed amount Y1 =
It is determined as 13 × 2.63 + 15 + 200 = 249.19 μm.

Next, at step 14, the pusher 12A is driven by the target feed amount Y1 by controlling the drive of the pusher motor 13 while detecting the position of the pusher 12A by the pusher position detector 15. Member 6
And pressurizes the valve seat member 6 to perform an adjusting pressurizing step as a second pressurizing step.

Then, after the end of step 14, the flow returns to steps 5 and 6 again to newly measure the lift amount L2 during pressurization and the lift amount L3 during release. It is determined whether or not the lift amount L3 falls within the above-mentioned predetermined standard range. Here, "YE
When the determination is "S", the process proceeds to step 8 to terminate the lift amount adjustment processing of the injection valve 1, and when the determination is "NO", the processing after step 9 is repeated, and the target feed amount Y1 is calculated again to adjust the lift amount. A pressure step and the like are performed.

Thus, according to the present embodiment, the lift amount of the valve body 8 is adjusted to the standard value L0 by the lift amount adjusting device including the pusher mechanism 12, the pusher motor 13, the valve body position detector 14, the controller 17 and the like. The injection valve 1 is adjusted so that the injection valve 1 has a specified injection amount. Therefore, the injection amount is adjusted without flowing the test liquid or the like to the injection valve 1 as in the related art. be able to.

Therefore, the structure of the lift adjusting device can be greatly simplified, downsized, and its maintenance can be easily performed. Further, the valve opening position and the valve closing position of the valve body 8 can be easily detected by the valve body position detector 14,
Since the lift amount of the valve body 8 can be measured immediately by each lift amount measurement step based on these detected values, there is no need to stabilize the flow rate of the test liquid or the like during the adjustment work and then measure it. Work efficiency can be greatly improved.

Further, the lift amount adjusting process of the injection valve 1 includes a first lift amount measuring step of measuring the initial lift amount L 1,
An initial adjustment amount calculating step of calculating an initial pressure P of the pusher 12A based on the initial lift amount L1;
Pressurizing step for initially pressurizing the valve seat member 6 until the pressing force by the pressure reaches the initial pressurizing P, and the second and third lift amount measuring steps for measuring the lift amount L2 during pressurization and the lift amount L3 during opening. And a target adjustment amount calculation step of calculating a target feed amount Y1 based on the lift amount L2 at the time of pressurization, the lift amount L3 at the time of opening, the initial lift amount L1, and the like, and the adjustment pressurization for moving the pusher 12A by the target feed amount Y1. In the initial pressurizing step and the adjusting pressurizing step, the valve seat member 6 can be appropriately pressurized by the pusher 12A so that the lift amount of the valve body 8 becomes the standard value L0. Efficient feedback control can be performed on the pusher mechanism 12.

That is, in the initial adjustment amount calculation step shown in step 3 in FIG. 3, the initial pressing force P can be appropriately set based on the difference ΔL between the initial lift amount L1 of the valve body 8 and the standard value L0. In the initial pressurizing step shown in step 4, when the pressure value detected by the pressure detector 16 reaches the initial pressure P, the pusher mechanism 12 is stopped, so that the lift amount of the valve 8 is set to the standard value L0. Initial adjustment can be performed efficiently to a near value.

In the target feed amount calculation step shown in steps 9 to 13, the plastic deformation amount D of the nozzle holder 5 (deformation portion 5A) and the remaining adjustment amount A1 of the lift amount in the initial pressurization step.
From the above, the correction coefficient a is calculated based on the data table of Table 2, and the springback amount S on the valve seat member 6 side is calculated, so that only the remaining adjustment amount A1 after the deformed portion 5A of the nozzle holder 5 springs back. The target feed amount Y1 can be set accurately so as to cause plastic deformation.

Thus, in the adjustment pressurizing step shown in step 14, the deformed portion 5A of the nozzle holder 5 is
Since the plastic deformation can be accurately performed for one minute, it is possible to reliably adjust the lift amount of the valve body 8 to the standard value L0.

Further, the target feed amount Y1 can be set in advance by the correction coefficient a.
2A can be quickly sent to the target position determined by the target feed amount Y1, and the adjustment pressurizing step can be performed efficiently.

Further, since the spring back amount S in the initial pressurizing step is fed back to the target feed amount Y1 in the adjusting pressurizing step, the lift amount of the valve body 8 is different for each production lot due to the difference in the spring back amount. Variations can be reliably prevented.

On the other hand, since the pusher 12A is driven by the pusher motor 13 composed of a stepping motor via a precision ball screw or the like, the controller 17
The pusher 12A can be sent with a desired feed amount with high accuracy by the drive signal output from the.

[0069] It should be noted that, in the previous you施例, step 3,9～
1 3 shows the adjustment amount calculating means, step 1 with a first lift amount measuring means, step 3 of initial adjustment amount calculation means, step 4 a first pusher controller, scan <br/> Step 5 represents second lift amount measuring means, step 6 represents third lift amount measuring means, steps 9 to 13 represent target feed amount calculating means, and step 14 represents second pusher control means. ing. The target adjustment amount indicates to the initial pressure P, a initial adjustment amount A1 or target feed amount Y1,.

[0070] On the other hand, before you施例has been initial pressing step and the adjusting pressing step in a configuration to send a pusher 12A with the same feed speed, the invention is not limited to this, for example, the actual施例pusher 12A and rough feed control in about the first period pressurization step a, may be configured to fine adjustment feed control in about adjusting pressurizing step.

[0071] In the front you施例, the valve position detector 1
4 is configured to detect the position by contacting the tracing stylus 14A with the back side of the valve body 8, but the present invention is not limited to this. For example, an ultrasonic sensor or the like may be used as a valve body position detector. Is also good.

[0072]

As described in detail above, according to the first aspect of the present invention, the initial adjustment amount of the lift is calculated by the initial adjustment amount calculating means, and the pusher control is performed based on the calculation result of the initial adjustment amount. Since the pusher mechanism is driven and controlled by the means to initially pressurize the valve seat side of the injection valve, the pusher mechanism can efficiently adjust the lift amount of the valve body to a value close to the standard value. The target feed amount of the pusher mechanism is calculated by the target feed amount calculating means based on the lift amount of the valve element measured after the initial pressurization, and the pusher mechanism is controlled by the second pusher mechanism control means based on the calculation result of the target feed amount. Since the mechanism is driven and controlled, the pusher mechanism can be efficiently feedback-controlled so that the lift amount of the valve body becomes a standard value, and the work efficiency of the lift amount adjustment operation can be greatly improved.

Further, according to the first aspect of the present invention,
The initial pressure of the pusher mechanism is obtained by the initial adjustment amount calculating means, and the first pusher control means drives and controls the pusher mechanism until the pressure of the pusher mechanism reaches the initial pressure. The initial pressing force can be appropriately calculated by the initial adjustment amount calculating means based on the amount,
The first pusher control means can efficiently adjust the lift amount of the valve body to a value close to the standard value.

[Brief description of the drawings]

1 is a longitudinal sectional view showing with a lift amount adjusting device injection valve according to real施例of the present invention.

FIG. 2 is a control block diagram showing a lift amount adjusting device in FIG. 1;

FIG. 3 is a flowchart showing lift amount adjustment processing by a controller in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Injection valve 5 Nozzle holder 5A Deformation part (valve seat side) 6 Valve seat member 6A Valve seat 8 Valve body 12 Pusher mechanism 12A Pusher 14 Valve body position detector (lift amount measuring means) 16 Pressure detector (Pressing force detecting means) L0 Specified value L1 Initial lift amount L2 Press lift amount L3 Open lift amount P Initial pressing force (Initial adjustment amount) A1 Remaining adjustment amount S Springback amount D Plastic deformation amount a Correction coefficient

Continuation of the front page (56) References WO 95/30830 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02M 61/16 F02M 51/06 F02M 65/00 306

Claims (1)

(57) [Claims] 1. A pusher mechanism for variably adjusting a lift amount of a valve body by pressurizing a valve seat side of an injection valve, and detecting a valve opening position and a valve closing position of the valve body to detect the valve body. Lift amount measuring means for measuring the lift amount of the valve, and initial adjustment for calculating an initial adjustment amount of the lift amount to be adjusted from the measurement result by the lift amount measuring means and a predetermined standard value of the lift amount of the valve body. A first pusher control means for controlling the drive of the pusher mechanism based on the initial adjustment amount by the initial adjustment amount calculation means and initially pressurizing the valve seat side of the injection valve by the pusher mechanism; and Based on the lift amount of the valve body measured by the lift amount measurement unit after the initial pressurization by the first pusher control unit,
A target feed amount calculating means for calculating a target feed amount of the pusher mechanism; and a drive control of the pusher mechanism by an amount corresponding to the target feed amount by the target feed amount calculating means, whereby the valve seat side of the injection valve is pressurized by the pusher mechanism. A second pusher control means for controlling the lift amount of the injection valve, wherein the pusher mechanism is provided with a pressing force detecting means for detecting a pressing force of the injection valve against a valve seat side; Calculates an initial pressure on the valve seat side of the injection valve as an initial adjustment amount based on the lift amount in the initial state by the lift amount measuring means and the standard value, and the first pusher control means When the pressure value detected by the pressure detection means reaches the initial pressure, the drive of the pusher mechanism is stopped. Place.