JPH09198942A - Conductor covering device for multi-extrusion process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductor covering device having a plurality of covering lines, which has an enhanced quality and producibility wherein the outside diameter of a covered conductor (covering thickness) in each line is controlled accurately and effectively. SOLUTION: In-line pressure compensated flow control valves 6a, 6b are installed on lines 1a, 1b, and an overflow pressure compensated flow-control valve 9 is provided for an extruder 3. The overflow rate, the outside diameter of a covered conductor on each line 1a/1b, and the supplied pressure of the insulative material are measured, and on the basis of the measurements and the control command, the revolving speed of the extruder 3 and the rates of flow of the insulative material given by the pressure compensated flow control valves 6a, 6b are regulated, and thus the outside diameters of the lines 1a, 1b are controlled by a multi-variable optimizing control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when a coating material such as a synthetic resin material is supplied from a single extruder to a plurality of conductive wire coating lines to coat the conductive wires in each line, the coating thickness in each line. The present invention relates to a conductor coating device in a multi-extrusion process equipped with control means capable of appropriately controlling (outer diameter of coated conductor).

[0002]

2. Related Background Art A covered conductive wire in which a conductive wire is covered with a covering material such as a synthetic resin usually extrudes a covering material in a molten state at a predetermined pressure by adjusting the screw rotation speed of an extruder, and While being guided around the conductor wire in the conductor wire coating line to cover the conductor wire, it is passed through a die having a predetermined inner diameter, and the outer diameter thereof is controlled to manufacture. In order to make the outer diameter (coating thickness) of the coated conductor wire constant in this way, for example, JP-A-60-35417 and JP-A-62-62 are used.
As disclosed in JP-A-177810, various methods for controlling the outer diameter (coating thickness) have been proposed.

By the way, a conductor coating apparatus by a so-called multi-extrusion process, in which a synthetic resin material is simultaneously supplied from a single extruder to a plurality of conductor coating lines to coat conductors in each line, is shown in FIG. It is configured. This example is provided with two coating lines 1a and 1b, and these lines 1a and 1b are melted from an extruder 3 which is a supply source thereof via manual flow valves 2b and 2b, respectively. The synthetic resin material is supplied at a predetermined pressure. Then, a die (not shown) selected according to the product size is provided on each line 1a, 1b to control the outer diameter (coating thickness) of the coated conductor wire, and according to the feed speed of the conductor wire 1a, 1b. The final outer diameter (coating thickness) of the coated conductor wire is set by adjusting the supply amount of the synthetic resin material to each of the manual flow valves 2b, 2b, 5 respectively.

A pressure sensor 4 is provided at the outlet of the extruder 3 and the rotation of the screw 3a of the extruder 3 is adjusted according to the resin pressure of the synthetic resin material detected by the pressure sensor 4. Thus, the resin pressure is stabilized. Further, by overflowing a part (small amount) of the synthetic resin material through the overflow flow valve 5, it is possible to stabilize the extrusion amount (supply amount) of the synthetic resin material to the respective lines 1a, 1b. .

[0005]

In the conventional apparatus described above, the supply amount of the synthetic resin material to the coating lines 1a and 1b is set by manually adjusting the manual flow valves 2b and 2b, respectively. Therefore, it is difficult to adjust the balance, and it takes a lot of time to adjust the balance. Especially, as the number of lines increases, the adjustment becomes difficult. Moreover, when starting the process, there is a problem that the flow of the synthetic resin material in each of the coating lines 1a and 1b cannot be controlled.

Further, since the outer diameter (coating thickness) of the coated conductor is only controlled by the open loop control mode, changes in the outer diameter (coating thickness) of the manufactured product (coated conductor) are properly grasped, and There is a problem that can not be corrected in real time. Furthermore, since the basic outer diameter (coating thickness) of the coated conductor is controlled by the die, there is a problem that it takes a lot of time to replace the die due to the change of the manufactured product. In particular, in the case of sequentially manufacturing a wide variety of products having different outer diameters (coating thicknesses), the work of exchanging dies becomes a considerable burden, which is a factor of productivity deterioration.

The present invention has been made in view of such circumstances, and an object thereof is to accurately measure the outer diameter (coating thickness) of the coated conductor in each line in a conductor coating apparatus having a plurality of coating lines. Another object of the present invention is to provide a conductor coating device provided with a control means capable of controlling efficiently.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, a wire coating apparatus in a multi-extrusion process according to the present invention supplies a coating material from a single extruder to a plurality of wire coating lines, and each line is coated with a coating material. Each of the conductor wires is coated, and in particular, a line flow control valve for adjusting the flow rate of the coating material supplied to each of the lines is provided, and the overflow flow rate of the coating material supplied from the extruder is adjusted. Provided with an overflow flow control valve,
On the other hand, while measuring the overflow flow rate with a flow sensor, the outer diameter sensor measures the outer diameter of the coated conductor wire coated with the coating material in each line, and the pressure sensor measures the outer diameter of the extruder. Control means for measuring the resin pressure of the coating material, and controlling the resin pressure of the coating material from the extruder and the outer diameter of the coated conductor in each line based on the detected value by each of these sensors and the control target value. Is provided.

That is, the outer diameter (coating thickness) of the coated conductor in each line, the overflow flow rate of the coating material, and the supply pressure of the coating material are obtained, and the rotational speeds of the flow rate control valve and the extruder are fed back in accordance with these information. By controlling, not only the resin pressure of the coating material but also the supply flow rate and the overflow flow rate of the coating material to each coating line are controlled to control the outer diameter (coating thickness) of the coated conductive wire.

According to a second aspect of the invention, as the control means in the first aspect, the number of revolutions of the extruder and the operation amount of each flow rate control valve are input variables of the process, the resin pressure, and the coated conductor in each line. Outer diameter or thickness of its coating,
And the state variable is calculated based on an autoregressive exogenous model with the output flow rate of the coating material as the output variable of the process, and the resin pressure of the extruder by the multivariable control using this state variable, the coating conductor of each line. It is characterized by controlling the outer diameter and the overflow flow rate, respectively.

Further, the invention according to claim 3 is the control means according to claim 1, wherein the number of revolutions of the extruder and the operation amount of each flow rate control valve are input variables of the process, the resin pressure, and the coated wire in each line. Outer diameter or thickness of its coating,
And the overflow flow rate of the coating material as the output variable of the process, the resin pressure of the extruder, the outer diameter of the coating wire in each line, and the overflow flow rate are controlled by model predictive control using a step response model. It is a thing.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A wire coating apparatus in a multi-extrusion process according to an embodiment of the present invention will be described below with reference to the drawings. It should be noted that although an apparatus having two coating lines will be described here, the same can be applied to an apparatus having three or more coating lines.

FIG. 2 is a block diagram showing a schematic configuration of the apparatus of the embodiment, which is basically constructed in the same manner as the conventional apparatus shown in FIG. In particular, the apparatus of this embodiment is characterized in that the manual flow rate valves 2a and 2b provided for the respective coating lines 1a and 1b are replaced with line flow rate control valves 6a and 6b for hydraulic or atmospheric pressure control. Further, the outer diameter sensors 7a and 7b for measuring the outer diameters of the coated conductors are provided on the coated lines 1a and 1b, respectively. The outer diameter sensors 7a and 7b are laser displacement sensors, for example. Further, the overflow passage 8 is provided with an overflow flow rate control valve 9 of hydraulic or atmospheric pressure control system,
The point is that a flow rate sensor 10 for measuring the overflow flow rate is provided. By measuring the outer diameter of the coated conductor with the outer diameter sensors 7a and 7b, the thickness (wall thickness) of the coating is substantially measured.

In the control device 11 described later,
The sensing data (detection value) by the pressure sensor 4 of the extruder 3 and the sensors 7a, 7b, 10 described above are respectively input, and together with the rotation speed of the screw 3a of the extruder 3 according to the set control target value. By adjusting the supply flow rate and the overflow flow rate of the synthetic resin material to the coating lines 1a, 1b by the flow rate adjusting valves 6a, 6b, 9 respectively, feedback control of the outer diameter of the coated conductor in each line is performed. Has become.

In this feedback control, for example, multi-variable control is executed by obtaining the state variable based on an autoregressive exogenous model in which each of the sensing data is used as a variable,
Alternatively, it is performed by executing model predictive control using a step response model. By such multivariable optimum control, the outer diameter (coating thickness) of the coated conductor in each of the coating lines 1a and 1b is comprehensively managed in the entire process, and each is controlled with high accuracy and stability. It has a feature.

The multivariable optimum control executed according to the state variables based on the autoregressive exogenous model will be described. The above-described embodiment apparatus is expressed as a control system shown in FIG. In FIG. 3, reference numeral 21 is an input indicating the rotational speed of the screw 3a of the extruder 3 and the valve opening degree for adjusting the flow rate in each of the flow rate adjusting valves 6a, 6b, 9 and 22 is the operation by the input 21. Extruder 3
Process such as a cross head at the exit of the coating line or the coating lines 1a and 1b. Further, 23 is the operation result of the process 22, that is, the resin pressure measured by the pressure sensor 4, the outer diameter of the coated conductor measured by the outer diameter sensors 7a and 7b, and the overflow flow rate measured by the flow rate sensor 10. . The output y (n) of the sensor 23 is input to the control device 11.

In the control device 11, the sensor 23 is used.
Difference e (n) between the output y (n) and the control target value yr is calculated by the error calculator 24, and the state estimating unit 25 calculates the state variable according to the output y of the sensor 23 and the input u of the process. X (n) is obtained, and the controller 26 sets the difference e (n) to zero [0] according to the state variable X (n) and the difference e (n) under a predetermined control gain K. The control value u (n + 1) for the system input 21 is obtained. In addition, the state estimation unit 25 uses the control value u and the sensor 2
The state variable X (n) is calculated according to the autoregressive exogenous model (ARX model) based on the output y of 3.

Next, the state variable X based on the ARX model having the input u (vector) and the output y (vector) as variables.
The calculation process of (n) will be described. Regarding the basics of the ARX model, for example, [Hashimoto, Ohno: “Process modeling by time series data analysis”, Japan Society for the Promotion of Science 14
3 Committee Workshop Technical Report (1989)].

Taking a 4-input 4-output control system as an example (the same applies to an n-input n-output control system),
When the input / output relationship is expressed by the ARX model, it is shown as follows, for example. y ₁ (n) = a ₁ y ₁ (n-1) + a ₂ y ₁ (n-2) + a ₃ u ₁ (n-1) + a ₄ u ₁ (n-2) + a ₅ u ₂ (n-1 ) + A ₆ u ₂ (n-2) + a ₇ u ₃ (n-1) + a ₈ u ₃ (n-2) + a ₉ u ₄ (n-1) + a ₁₀ u ₄ (n-2) (1) y ₂ (n) = b ₁ y ₂ (n-1) + b ₂ y ₂ (n-2) + b ₃ u ₁ (n-1) + b ₄ u ₁ (n-2) + b ₅ u ₂ (n-1 ) + B ₆ u ₂ (n-2) + b ₇ u ₃ (n-1) + b ₈ u ₃ (n-2) + b ₉ u ₄ (n-1) + b ₁₀ u ₄ (n-2) (2) y ₃ (n) = c ₁ y ₃ (n-1) + c ₂ y ₃ (n-2) + c ₃ u ₁ (n-1) + c ₄ u ₁ (n-2) + c ₅ u ₂ (n-1 ) + C ₆ u ₂ (n-2) + c ₇ u ₃ (n-1) + c ₈ u ₃ (n-2) + c ₉ u ₄ (n-1) + c ₁₀ u ₄ (n-2) (3) y ₄ (n) = d ₁ y ₄ (n-1) + d ₂ y ₄ (n-2) + d ₃ u ₁ (n-1) + d ₄ u ₁ (n-2) + d ₅ u ₂ (n-1 ) + D ₆ u ₂ (n-2) + d ₇ u ₃ (n-1) + d ₈ u ₃ (n-2) + d ₉ u ₄ (n-1) + d ₁₀ u ₄ (n-2) (4) However, y ₁ , y ₂ , y ₃ , y ₄ are resin pressure, outer diameter 1, outer diameter 2,
It is an output amount indicating each overflow flow rate, and each output amount is detected by a sensor. Further, u ₁ , u ₂ , u ₃ , and u ₄ are input quantities indicating the extruder rotation speed and each control valve opening.

Next, in order to obtain the state variable, the above equation (1) is converted into X ₁ (n) = y ₁ (n) X ₂ (n) = y ₁ (n-1) → X ₂ (n + 1) = y ₁ (n) = X ₁ (n) X ₃ (n) = u ₁ (n-1) → X ₃ (n + 1) = u ₁ (n) X ₄ (n) = u ₂ (n-1) ) → X ₄ (n + 1) = u ₂ (n) X ₅ (n) = u ₃ (n-1) → X ₅ (n + 1) = u ₃ (n) X ₆ (n) = u ₄ The following relation is obtained by converting and rearranging as (n-1) → X ₆ (n + 1) = u ₄ (n).

[0021]

[Equation 1]

Similarly, the following relations are obtained from the above equations (2), (3) and (4).

[0023]

[Equation 2]

[0024]

(Equation 3)

[0025]

(Equation 4)

By rearranging these equations (5), (6), (7) and (8), the following equation is obtained, and it becomes possible to calculate the process state from this equation.

[0027]

(Equation 5)

That is, the autoregressive exogenous model is the process 2
The present output is estimated from the past values of input and output in 2. By using this autoregressive exogenous model, the process model shown in FIG. 3 is expressed as, for example, the following state equation. X (n + 1) = ΦX (n) + Γu (n) y (n) = CX (n) In the above equation, X (n) is a state variable at a certain time point n, and u (n) is the screw 3a. Input variables (4 variables) that respectively represent the rotational speed of each of the flow control valves 6a, 6b, and 9 and the opening (operation amount) of each of the flow control valves 6a, 6b, 9; , 1b each outer diameter of the coated conductor, and the output variable (4
Variable). Further, Φ, Γ and C are the above-mentioned model coefficients.

On the other hand, based on the state variable X (n) represented by the above state equation, in order to execute the multivariable optimum control,
The difference between the control target value yr and the output variable y (n) is set to e (n) = yr−y (n) (10), and the state variable X (n at each time point is set to zero (0). ) And the amount of change in the input variable u (n) by ΔX (n) = X (n + 1) -X (n) (11) Δu (n) = u (n + 1) -u (n) ... ( 12), ΔX (n + 1) = X (n + 2) -X (n + 1) = ΦX (n + 1) + Γu (n + 1) -ΦX (n) -Γu (n) = .PHI.X (n) +. GAMMA.u (n) (13) e (n + 1) = yr-y (n + 1) = yr- [CX (n + 1)] = yr- [C (.DELTA.X (n) + X ( n))] = yr-CΔX (n) -CX (n) = e (n) -CΔX (n) (14), and the above equation of state can be modified and organized as follows.

[0030]

(Equation 6)

In order to perform the optimization control in which the output offset e (n) is set to zero [0] by this new state equation, a control algorithm that minimizes the evaluation function, that is, an optimum algorithm with an integrator is executed. good. Specifically, u may be selected so as to minimize the evaluation function J such that J = ΣΔy (n) 'QΔy (n) + Δu (n)' RΔu (n). In order to minimize this evaluation function J, the following Riccati's equation P = Φ ^T PΦ + C ^T QC-Φ, which is described in detail in [Setsuo Sagara et al .: “Basics of digital control” (Corona Corp.)], is equivalent. ^The input u is obtained by solving ^T P Γ (R + Γ ^T P Γ) ⁻¹ Γ ^T P Φ, and the relational expression is

[0032]

(Equation 7)

The control algorithm may be expressed as In the above equation, Q is positive definite or semi-positive definite (Q ≧ 0), and P is positive definite (P> 0).
K is a control gain. Thus, according to the control device 11 that executes the multivariable optimization control according to the control algorithm described above, the outer diameter of the coated conductor wire coated with the synthetic resin material in the conductor wire coating lines 1a and 1b, the supply pressure of the synthetic resin material, and the like. Based on the overflow flow rate, the number of rotations of the screw 3a of the extruder 3 as well as the flow rate control valve 6a,
Since the multi-variable control is performed in consideration of the interrelation between the supply flow rate and the overflow flow rate of the synthetic resin material to the lines 1a and 1b by 6b and 9, the outer diameters of the coated conductors in the lines 1a and 1b are managed with high accuracy. Can be controlled.

Further, since the state variables of the process are obtained according to the autoregressive exogenous model and the optimization control is executed based on these state variables, each line 1a, 1b of the constituent resin material is
It is possible to manage the outer diameter of the coated conductor while properly grasping the supply flow rate to the conductor to achieve full automation of the conductor coating.
In particular, the supply flow rate of the synthetic resin material can be adjusted in a well-balanced manner for the plurality of conductor coating lines 1a and 1b, and since there is no need for manipulating the adjustment, the work efficiency is very good and the productivity is improved. It is possible to plan. Further, by adjusting the overflow flow rate, it is possible to stabilize the supply amount of the synthetic resin material from the extruder 3 and also to significantly reduce the interference with the supply of the synthetic resin material between the lines 1a and 1b. Because each line can be 1
It is possible to stably and accurately perform the conductive wire coating steps in a and 1b. Regarding the overflow flow rate, it is desirable to reduce the weight in the actual control process so as to absorb some fluctuations and prevent the fluctuations from affecting the entire control system. However, it goes without saying that the overflow flow rate itself is limited to a small amount.

Further, according to the present apparatus which executes the control as described above, since the supply amount of the synthetic resin material to each of the lines 1a and 1b can be individually controlled, for example, the die can be changed each time according to the product specifications. Even if it is not replaced, a die having a certain inner diameter can have an allowable width with respect to the wire diameter (outer diameter). Specifically, the supply flow rate of the synthetic material can be adjusted according to the feeding speed of the conductive wire. Therefore, it is no longer necessary to adjust the outer diameter (coating thickness) of the coated conductor by individually relying on the inner diameter of the die for each size as in the conventional case, and the outer diameter (coating thickness) of the coated conductor of a certain size width It is possible to use a common die, and it is possible to widen the allowable width of the die. In other words, the outer diameter (coating thickness) can be managed with high accuracy within a certain width by the above control without exchanging the dies for a certain range of products. The work time required for exchanging the dies when manufacturing various types of coated conductors of different types) is significantly reduced, and the production efficiency can be improved.

By the way, in the above description, the state variable of the process is obtained based on the autoregressive exogenous model and the optimal control is executed. For example, as shown in FIG. You may make it perform optimal control using the method of control prediction. Regarding this model control prediction, for example, [Takamatsu, Hashimoto, Oshima, Ohno:
"A Study on Structure of Model Predictive Control", Chemical Engineering Papers, 13, 1 (1987)], [Matsuyama, et al .: "New Chemical Engineering ・
Process system engineering "Ohmsha Co., Ltd.] basically uses a dynamic model of the process to predict the value of the output (control amount) in the future from the present time, and the predicted value is the target value as much as possible. It is an algorithm that decides the input so that it approaches.

This model control prediction method will be briefly described. In the 1-input 1-output step response model, for example, as shown in the basic concept of FIG. 7, the output j steps ahead from the current time t is y _M (t. + j)

[0038]

(Equation 8)

Is represented as That is,

[0040]

[Equation 9]

[Mathematical formula-see original document] and can be expressed as a vector matrix as y _M = y _M0 + A _F Δun + A ₀ Δu ₀ . However, in the above equation, y _M is a model value of the process, u is an input value of the process, and A _F and A ₀ are model coefficients. However, since the process output calculated from the step response model and the output value of the actual process rarely match, the actual output value y (t) at time t is used as follows. Predict the output value y (t + j) after j steps.

[0042] _{y P (t + j) =} y M (t + j) + y (t) -y M (t) vector matrix representation of the predicted output value is indicated as _{y P = y M + y-} y M0. However, y _P = [y _P (t + L), y _P (t + L + 1), ... y _P (t + L + P-1)] ^T y = [y (t), y (t) , ... Y (t)] ^T y _M0 = [y _M (t), y _M (t), ... Y _M (t)] ^T. On the other hand, the ideal variation curve of the process output, as shown in FIG. _{7, y R (t + j)} = α j-L + 1 y (t) + (1-α j-L + 1) r (t + j) is represented by the reference trajectory. When this reference trajectory is represented by a vector matrix, y _R = αy + (1-α) r. However

[0043]

(Equation 10)

Is as follows. Therefore, in the controller 27 of the control device 11 in FIG.

[0045]

[Equation 11]

In order to minimize the evaluation function as follows, the input of the process 22 is optimized and controlled according to the control algorithm Δun = (A _F ^T A _F ) ⁻¹ A _F ^T (y _R −y −A ₀ Δu ₀ ). It should be done. In this way, using the method of model control prediction, the screw 3 of the extruder 3 is
Even if the flow rate control valves 6a, 6b, and 9 supply the synthetic resin material to the respective lines 1a and 1b and the overflow rate together with the rotational speed of a, the above-mentioned embodiment apparatus The same effect as can be obtained.

When executing the above-mentioned optimization control, the processing procedure may be advanced in accordance with the processing procedure shown in FIG. 5 or FIG. 6, for example. Specifically, the target value is set, the control parameter is set, and the control sampling time is set before starting the process (step S1). After confirming the necessity of resetting (resetting) the setting (step S2), the sampling time is checked (step S3).

Every time a predetermined control sampling time is measured in this state, the output variable Y is read from the process, the state variable X is calculated, and the calculated state variable X is stored (step S4). In the case of model predictive control, Δu ₀ is calculated instead of the state variable X (step S4). Then, the input variable u is calculated based on the calculated and stored state variable X according to the control algorithm described above, and the value is stored (step S5).
At the same time, the calculated input variable u is output to the process to execute the adjustment described above (step S6). Such a processing procedure is repeatedly executed at every control sampling time described above until the end time point associated with the stop of the process (step S7).

Thus, according to the embodiment apparatus configured as described above and executing the multivariable optimization control, the outer diameter (coating thickness) of the coated conductor wire of each line in the multi-extrusion processing can be efficiently managed. In addition, it is possible to improve the working efficiency while improving the accuracy of manufactured products. Moreover, from the start of the process, it is possible to manage the outer diameter of the coated conductor (the thickness of the coating), and the control system is robust against disturbance and executes the optimized control for the set target. While mitigating the strict requirement for the inner diameter of the die, the outer diameter (coating thickness) of the final coated conductive wire can be controlled with high accuracy, which is a great practical effect.

The present invention is not limited to the above embodiment. For example, in the embodiment, the conductor coating apparatus having two lines has been described as an example, but the same can be applied to a process having three or more lines.
Further, instead of the outer diameter of the coated conductor, the thickness of the coating may be adopted as an output variable to execute the multivariable optimization control. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0051]

As described above, according to the present invention, 1
In a conductor coating apparatus for coating a plurality of conductor coating lines from a single extruder to coat conductors in each line, a line flow control valve is provided for each line and an overflow flow control valve is provided. On the other hand, the overflow flow rate and the outer diameter of the coated conductor in each line, and the supply pressure of the coating material from the extruder is measured, respectively, based on these measured values and control target value the supply pressure and the Since the flow rate of the coating material is adjusted by each flow rate control valve, the outer diameter (coating thickness) of the coated conductive wire in each line can be managed efficiently and highly accurately. Therefore, it is possible to simplify the automation and save labor and improve productivity.

According to the second aspect of the present invention, the state variable is determined based on an autoregressive exogenous model in which the outer diameter of the coated conductor in each line or the thickness of the coating and the overflow flow rate of the coating material are variables. The outer diameter of each coating line is controlled by adjusting the resin pressure and each flow rate control valve of the extruder by multivariable control using this state variable, so that a plurality of control objects (lines) are mutually controlled. While associating, they can be controlled individually with high accuracy and efficiency.

According to the third aspect of the present invention, the outer diameter of the coated conductor in each line or the thickness of the coating, and the overflow flow rate of the coating material are used as output variables, and the rotation speed of the extruder and the flow control valve. According to the model control prediction algorithm with the opening as an input variable, the resin pressure of the extruder and the flow control valves are adjusted to control the outer diameter of each coating line, so that it is effective while predicting the progress of the process. There are practically great effects such as control being possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a conventional wire coating apparatus by multi-extrusion processing.

FIG. 2 is a block diagram showing a schematic configuration of a conductor coating device according to an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a multivariable optimization control system using an autoregressive exogenous model.

FIG. 4 is a schematic configuration diagram of a multivariable optimization control system using a model control prediction algorithm.

FIG. 5 is a diagram showing an example of a control processing procedure using an autoregressive exogenous model in the embodiment apparatus.

FIG. 6 is a diagram showing an example of a control processing procedure using model predictive control in the embodiment apparatus.

FIG. 7 is a diagram showing a basic concept of model predictive control.

[Explanation of symbols]

 1a, 1b Conductor coating line 3 Extruder 4 Pressure sensor 6a, 6b Line flow control valve 7a, 7b Outer diameter sensor 9 Overflow flow control valve 10 Flow sensor 11 Control device

Claims (3)

[Claims] 1. A conductor wire coating apparatus in a multi-extrusion process in which a coating material is supplied from a single extruder to a plurality of conductor wire coating lines to coat the conductor wires in each line, respectively. A flow rate control valve for the line that controls the supply flow rate of the coating material to the line, an overflow flow rate control valve that is provided in the overflow passage from the extruder and that controls the overflow flow rate of the coating material, and measures the overflow flow rate. A flow sensor,
An outer diameter sensor that is provided in each of the lines and measures the outer diameter of the coated conductor covered with the coating material, a pressure sensor that measures the resin pressure of the coating material from the extruder, and each of these. A multi-variable control means for controlling the resin pressure of the coating material from the extruder and the flow rate of the coating material by each of the flow rate control valves based on the detection value by the sensor and the control target value is provided. Conductor coating device. 2. The multivariable control means sets the input variable of the process to the rotation speed of the extruder and the operation amount of each of the flow rate control valves, and sets the output variable of the process to the resin pressure of the coating material from the extruder. , The outer diameter of the coated conductor in each line, and calculate the state variable based on the autoregressive exogenous model as the overflow flow rate of the coating material, the resin pressure of the extruder, each by the multivariable control using this state variable, The conductor coating device in the multi-extrusion process according to claim 1, wherein the outer diameter and the overflow flow rate of the coated conductor in the line are respectively controlled. 3. The control means sets the input variable of the process to the rotation speed of the extruder and the operation amount of each of the flow rate control valves,
By the model predictive control using a step response model in which the output variable of the process is the resin pressure of the coating material from the extruder, the outer diameter of the coating conductor in each line, and the overflow flow rate of the coating material, the resin of the extruder is The conductor coating apparatus in the multi-extrusion process according to claim 1, wherein the pressure, the outer diameter of the coated conductor in each line, and the overflow flow rate are controlled respectively.