JPH04311676A - Static flow regulating device for fuel injection valve - Google Patents

Abstract

PURPOSE:To improve the straightness of the optimum combination between a valve assembly and a nozzle plate so as to enable the automation of flow adjustment. CONSTITUTION:A flow measuring means 130 measures the actual flow at the combined time of a valve assembly 1 rank-divided by lift quantities and a nozzle plate 2 selected according to the lift quantity. A judging means 140 judges whether the actual flow is within the specified value, and when the actual flow is out of the specified value, a selecting means 150 refers to a data base 120 to select the nozzle plate 2 in the optimum flow rank again and to perform automatic flow adjustment by the combination of the optimum nozzle plate 2.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention enables fuel injection by selecting and combining the most suitable valve assemblies classified according to valve needle lift amounts and nozzle plates classified according to individual flow rates. The present invention relates to a static flow rate adjustment device for a fuel injection valve that adjusts the static flow rate of the valve.

0002

2. Description of the Related Art A fuel injection valve used in an electronically controlled fuel injection system for an internal combustion engine is known to have a valve assembly 1 and a nozzle plate 2, as shown in FIG. The valve assembly 1 is comprised of a valve body 3 and a valve needle 4 slidably fitted into the valve body 3. Further, the nozzle plate 2 is attached to the nozzle tip end surface 3a of the valve body 3, and has a fine nozzle nozzle 2a in the center.

By the way, the flow rate of the fuel injection valve is determined by the lift amount of the valve needle and the individual flow rate of the nozzle plate, and the adjustment of the static flow rate of the fuel injection valve is performed by selecting the optimal nozzle plate for the valve assembly. This is done by combining.

Conventionally, when adjusting the static flow rate of a fuel injection valve, first, the valve assemblies are ranked by lift amount in units of 1 μm, for example, and the nozzle plates are ranked by unit flow rate in units of 1 cc/min, for example. I'll keep it. Next, from among the ranked valve assemblies and nozzle plates that the operator has judged to be an optimal combination, they are assembled and set in the flow rate measuring device as shown in FIG. Then, the test liquid at a predetermined pressure is caused to flow through the valve assembly and the nozzle plate while the valve needle is lifted, and the flow rate is measured. At this time, if the measured value is within the standard value, the combination of the valve assembly and nozzle plate is an acceptable product. In addition, if the initial combination fails to adjust to the standard flow rate, the operator selects a nozzle plate of a different rank based on the difference between the measured value and the standard value.
Assemble this into the valve assembly in place of the previous nozzle plate and measure the flow rate again. Here, if the measured value does not reach the standard value, the nozzle plate is replaced with a nozzle plate of another rank selected by the operator, and the flow rate is measured again. Thereafter, similar operations are repeated until the adjustment can be made to the standard value.

On the other hand, when selecting a nozzle plate,
For example, even if the measured value is 2 cc/min less than the standard value, even if you simply select a nozzle plate with a rank 2 cc/min higher than the current nozzle plate and assemble it into the valve assembly, the flow rate will still meet the standard value. It is not always possible to adjust the value, and there are cases where a nozzle plate with a rank of 2cc or more or less is better. The factors that lead to this are
This is due to variations in the diameter of the nozzle holes in the nozzle plate. Therefore, in the past, a nozzle plate of a rank determined to be optimal based on the operator's past experience was selected, and the flow rate was adjusted accordingly.

[0006]

[Problems to be Solved by the Invention] However, such conventional static flow rate adjustment methods rely on the operator's intuition based on past experience and data to determine the relationship between the valve assembly and the nozzle plate. Since the optimum combination is selected, a skilled worker is required, a large amount of manpower is required, and ambiguity tends to occur in the selection of nozzle plates. For this reason, the number of nozzle plate selections required for flow rate adjustment increases, and the combination direct rate increases, i.e., once or twice.
The problem is that the probability of reaching an optimal combination decreases after only a few nozzle plate selection operations, and the flow rate adjustment operation becomes complicated, making it impossible to support mass production. SUMMARY OF THE INVENTION An object of the present invention is to provide a static flow rate adjustment device for a fuel injection valve that can improve the combination directness of a valve assembly and a nozzle plate, and can automate flow rate adjustment.

[0007]

[Means for Solving the Problems] The present invention will be explained with reference to FIG. 1, which is a diagram corresponding to the claims. Applicable to devices that adjust the static flow rate of valves. The above purpose is achieved by a classification means 10 for ranking the valve assembly 1 into predetermined lift amount units.
0, a classification means 110 for ranking the nozzle plate 2 into predetermined individual flow rate units, and determining an optimal combination of the ranked lift amount of the valve assembly 1 and the ranked nozzle plate 2. a database 120 for constructing data for the valve assembly 1;
a flow rate measuring means 130 for measuring the actual flow rate by combining the nozzle plate selected according to the lift amount; and a determining means 140 for determining whether the actual flow rate measured by the flow rate measuring means 130 is within a standard value. This can be achieved by including a selection means 150 that selects the optimum nozzle plate by referring to the database 120 when the actual flow rate is outside the standard value.

[0008]

[Operation] The flow rate measuring means 130 measures the valve assembly 1 and the nozzle plate 2 selected according to its lift amount.
Measure the actual flow rate when combined with Actual flow rate is determination means 1
40, it is determined whether the nozzle plate 2 is within the standard value, and when it is determined that it is outside the standard value, the nozzle plate 2 with the optimum flow rate rank is reselected by the selection means 150 with reference to the database 120, and the nozzle plate 2 with the optimum flow rate is selected. The flow rate can be adjusted by combining suitable nozzle plates.

[0009]

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 2 to 7. FIG. 2 shows an overall configuration diagram. In FIG. 2, reference numeral 10 is a classification device that classifies the valve assemblies 1 by lift amount in microns by measuring the lift amount of the valve assembly 1, and 11 is a classification device that measures the individual flow rate of the nozzle plate 2. nozzle play
This is a classification device that classifies the 2 types of water by flow rate in units of 1 cc/min. The data for each lift amount of the valve assembly 1 obtained by the classification device 10 and the data for each individual flow rate of the nozzle plate 2 obtained by the classification device 11 are inputted into a control circuit 12 to be described later. It has become.

The control circuit 12 is composed of a microprocessor, etc., and has the function of selecting the nozzle plate 2 of the single flow rate rank that is optimal for the lift amount of the valve assembly 1, and the function of selecting the nozzle plate 2 of the selected valve assembly 1 and the nozzle plate. -In addition to having a function to determine whether the flow rate when combined with Toto 2 is within the standard value and a learning function to improve the combination direct rate, it also has a function to control various devices necessary for static flow rate adjustment. There is.

13 is the selected valve assembly 1
This flow rate measuring device 13 measures the actual static flow rate when the nozzle plate 2 and the nozzle plate 2 are combined.
is connected to the control circuit 12, and the measurement result is sent to the control circuit 1.
Incorporated into 2. Further, reference numeral 14 refers to one of the valve assemblies 1 classified by the classification device 10 to the flow rate measuring device 13.
15 is a conveying device that conveys one of the nozzle plates 2 classified by the sorting device 11 to the flow rate measuring device 13, and these conveying devices 14 and 15 are composed of manipulators and the like, It is controlled by a control device 12. Reference numeral 16 denotes a storage device for storing the learning control map shown in FIG. 5 and other data, and this storage device 16 is connected to the control circuit 12. Further, 17 is a keyboard for inputting the lift amount of the valve assembly 1 whose flow rate is adjusted, and this keyboard 17 is connected to the control circuit 12.
It is connected to the.

FIG. 3 is a schematic diagram of the valve assembly classification device 10. As shown in FIG. In the figure, reference numeral 101 indicates a reference plate 10 inside which restricts the upward movement of the valve needle 4.
An upper clamper 1a has an upper clamper 1a, and a lower clamper 102 holds the valve assembly 1 in a vertical state by clamping the upper end edge of the valve body 3 from above and below by both clampers 101 and 102.

Above the valve assembly 1, the amount of movement of the valve needle 4 pushed up by the pusher pin 103, that is, the amount of lift H until the flange 4a of the valve needle 4 comes into contact with the reference plate 101a is indicated. A lift measuring device 104 such as a differential transformer for detection is installed. The sorting device 105 consisting of a robot etc. sorts the valve assembly 1 into six ranks V1 to V6 in units of 5 μm, for example, as shown in FIG. 5, based on the output signal from the lift measuring device 104. They are arranged and stored in pallets 106 classified by lift amount.

FIG. 4 is a schematic diagram of the nozzle plate sorting device 11. As shown in FIG. In the figure, 111 is a nozzle plate.
This is a parts feeder that aligns the nozzle plates 2 in a predetermined posture.
are supplied one by one to a flow measuring device 112, the individual flow rate of which is measured, and the measurement results are output to a sorting device 113 consisting of a robot or the like. The sorting device 113 sorts the nozzle plates 2 into 13 ranks RN1 to RN1 in units of 2 cc/min, for example, as shown in FIG. 5, based on the measurement results.
The RNs are divided into RNs 13, and these are arranged and stored in pallets 114 classified by flow rate.

Next, the operation of this embodiment configured as described above will be explained with reference to the flowcharts of FIGS. 6 and 7. When the flow rate adjustment flow shown in FIG. 6 starts, first, in step S1, the control circuit 12
An operation command is given to 4. As a result, the transport device 14
picks up only one valve assembly 1 ranked by the sorting device 10 from an arbitrary pallet 106 and loads it into the flow rate measuring device 13. In the next step S2, the nozzle plate 2 with the optimum flow rate that matches the loaded valve assembly 1 is
The learning control map shown in FIG. 5 is selected based on the lift amount of the valve assembly. In the next step S3, the conveying device 15 is operated based on the nozzle plate selection command, and the selected nozzle plate 2 is transferred to the sorting device 11.
The flow measuring device 1 is picked up from the pallet 114 of
Load to 3.

In FIG. 5, the numerical values shown in the column of each lift amount rank of the valve assembly represent the optimum number of combinations of nozzle plates for each rank flow rate for the valve assembly. These numerical values are updated every time an optimal combination is made. Further, such a learning control map is constructed in the storage device 16, and when selecting a nozzle plate for the first time for a valve assembly using this map, for example, in a valve assembly with a lift amount rank V1, The nozzle plate of rank RN10 with the largest number of combinations is selected. This increases the first combination directness rate.

Note that at the initial stage before the learning control map is constructed as shown in FIG. 5, the optimum combination values of nozzle plates in each column are all zero. Therefore, 1
When selecting the nozzle plate for the second time, rank RN7 located in the center of the flow rate ranks is automatically selected.

In the next step S4, the flow rate measuring device 13 is operated in response to a command from the control circuit 12, and the static flow rate is measured with the valve assembly 1 and nozzle plate 2 in the combined state shown in FIG. In the next step S5,
By taking in the flow rate data measured by the flow rate measuring device 13 into the control circuit 12, it is determined whether the flow rate is within the standard value. Here, when it is determined that the flow rate value is within the standard value, the process proceeds to step S6, and when it is determined that the flow rate value is outside the standard value, the process proceeds to step S9.

In step S6, processing is performed to indicate that the valve assembly is an acceptable product whose flow rate is adjusted within the standard value by the nozzle plate. Then, the next step S7
Now, the optimal combination value of the nozzle plate selected for the valve assembly in the learning control map is updated. In the next step S8, the valve assembly and nozzle plate, which are accepted products, are taken out from the flow rate measuring device 13, and after each is washed and dried, the valve assembly and nozzle plate are assembled as a set into an adjusted product. Store on a pallet.

On the other hand, in step S9, it is determined whether the number of reselections of the nozzle plate 2 for the same valve assembly 1 is the fourth time. Here, if it is determined that the number of reselections is the fourth time, the process proceeds to step S10, where a process is performed to indicate that the valve assembly is a defective product, and the process moves to the next process. If it is determined that the number of times of reselection is not the fourth, the process proceeds to step S11, and the following combination nozzle play-trunk calculation formula for the second and subsequent times is executed. Next rank = Previous air flow rate value - α (combined flow rate value - standard value) However, α is the conversion count of the nozzle plate, and 1
The values are as follows.

For example, if the previous nozzle plate reflow rate was 114 (cc/min) and the combined flow rate was 104 (cc/min),
min), the standard value is 100 (cc/min), and α=1, then the flow rate rank of the nozzle plate to be selected next is as follows: Next rank = 114-1 x (104-10
0)=110. That is, the next nozzle plate will have rank RN6 corresponding to 110 (cc/min).
The nozzle plate will be selected (step S
12). Then, the process returns to step S4, and the flow rate is adjusted by executing the processes from step S4 onwards again.

FIG. 7 is a conceptual processing flow for updating the combined numerical values of the learning control map, and shows the case where the lift amount rank of the valve assembly is V1. first,
In step S30, it is determined whether the selected nozzle plate is of rank RN1. If the rank is RN1, the process advances to step S31, and it is determined whether the nozzle plates are an optimal combination. In the case of an optimal combination, in step S32, the combination value of the nozzle plate rank RN1 in the lift amount rank V1 is incremented by 1. After determining the end in step S33, the process returns. When a negative determination is made in step S30, the process proceeds to step S34, and the nozzle play trunk RN2 is updated in the same manner as the nozzle play trunk RN1. Hereinafter, the same process is performed for the nozzle play trunk RN3.

In this embodiment, a nozzle plate is automatically selected with reference to a learning control map in which combination values are updated when the combination is determined to be optimal for the valve assembly. This reduces the number of unnecessary combinations of nozzle plates during flow rate adjustment, and improves the orthogonal rate of nozzle plate combinations at the first time. In addition, when selecting nozzle plates from the second time onwards, we used the calculation formula of the previous respiration flow rate value - α (combination flow rate value - standard value), so the nozzle plate combinations from the second time onwards The direct rate can also be improved. Furthermore, automation of the flow rate adjustment of the valve assembly becomes easy, and mass production can be supported.

It should be noted that the present invention is not limited to the configuration shown in the above embodiments, but can be modified in various ways without departing from the scope set forth in the claims.

In the above embodiment, the valve assembly classification device 10 is the valve assembly classification means 100.
The nozzle plate sorting means 11 sorts the nozzle plate sorting device 11, the flow rate measuring device 13 sorts the flow rate measuring means 130, the control circuit 12 sorts the determining means 140 and the nozzle plate selecting means 150, and the storage device 16 sorts the data. tabase 120
Configure each.

[0026]

[Effects of the Invention] As explained above, according to the present invention, the optimum combination of nozzle plates is selected according to the lift amount of the valve assembly by referring to a database. This reduces the number of combinations of nozzle plates, improves the perpendicular rate of nozzle plate combinations at the first time, and facilitates automation of flow rate adjustment by changing the nozzle plate combinations.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a static flow rate adjustment device for a fuel injection valve that corresponds to a complaint.

FIG. 2 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a valve assembly classification device in this embodiment.

FIG. 4 is a schematic configuration diagram of a nozzle plate sorting device in this embodiment.

FIG. 5 is a diagram showing an example of a learning control map in this embodiment.

FIG. 6 is a flowchart showing a flow rate adjustment procedure in this embodiment.

FIG. 7 is a flowchart showing updating of a learning control map in this embodiment.

FIG. 8 is a cross-sectional view of the valve assembly and nozzle plate assembled together.

[Explanation of symbols]

1 Valve assembly 2 Nozzle plate 10 Valve assembly classification device 11 Nozzle plate classification device 12 Control circuit 13 Flow rate measurement devices 14, 15 Transfer device 16 Storage device 100 Valve assembly classification means 110 Nozzle plate classification means 120 Table base 130 Flow rate measurement means 140 Judgment means 150 Nozzle plate selection means

Claims (3)

[Claims] [Claim 1] Valve assembly and nozzle plate
In the static flow rate adjustment device for a fuel injection valve, the flow rate is adjusted by combining the valve assembly with a classification means for ranking the valve assembly into predetermined lift amount units, and the nozzle plate into a predetermined individual flow rate unit. a classification means for ranking; a database for constructing data for determining an optimal combination of the lift amount of the ranked valve assembly and the ranked nozzle plate; a flow rate measuring means for measuring an actual flow rate by combining the valve assembly and a nozzle plate selected in accordance with the lift amount thereof; A static control system for a fuel injection valve, characterized in that it comprises a determination means for making a determination, and a selection means for selecting an optimal nozzle plate by referring to the database when the actual flow rate is outside the standard value. Flow rate adjustment device. 2. The fuel injection valve according to claim 1, wherein the data for determining the optimum nozzle plate is updated by learning control every time the actual flow rate and the standard value match. Static flow regulator. [Claim 3] When selecting a nozzle plate from the second time onwards, {previous air flow rate - (nozzle plate conversion count α)
2. The static flow rate adjustment device for a fuel injection valve according to claim 1, wherein the nozzle plate is selected based on the equation: x (actual flow rate - standard value)}.