JPWO2019097597A1 - Temperature control device and method of estimating temperature rise completion time - Google Patents

Abstract

The total power suppression coefficient common to each temperature control zone is set to a predetermined output limiter value that is set for each temperature control zone so that the temperatures of the temperature control zones 11 to 1N reach the target temperature at the same time. A reference output temperature calculated value obtained by substituting a reference condition into an approximate expression that approximates the temperature rise characteristic of the controlled object with the suppression output limiter value that is a multiplied value as the upper limit of the manipulated variable, and the above approximation A temperature rise time ratio, which is a ratio to a temperature rise time calculation value obtained by substituting a desired setting condition into the equation, is calculated, and the temperature increase time actually measured under the reference condition is multiplied by the temperature increase time ratio. Thus, the temperature control device is characterized in that the estimated temperature rise time is calculated.

Description

  The present invention relates to a temperature control device that controls the temperatures of a plurality of temperature control zones and a method for estimating the temperature rise completion time.

In plastic molding machines with multiple temperature control zones, reflow furnaces, heat treatment equipment, etc., heaters are designed according to the characteristics such as heat capacity in each temperature control zone, but in actual temperature control, each temperature control There are often variations in the time when the zone reaches the target temperature.
In the temperature control zone that has reached the target temperature early, it is necessary to maintain the target temperature until the other temperature control zones reach the target temperature, so the resin that is a molded product such as a plastic molding machine may burn. is there. In addition, wasteful power is consumed.
In order to solve such a problem, in Patent Document 1, in order to synchronize the temperature increase completion time, the temperature after a predetermined time has elapsed based on the temperature measurement value of the temperature control zone in which the time to reach the target temperature is the latest And a temperature control method for setting the predicted temperature to a temporary target temperature of another temperature control zone.
In Patent Document 2, even if the target temperatures of the plurality of temperature control zones are different, in order to be able to synchronize the temperature rising completion time, the temperature control zone (master There is disclosed a temperature control method for calculating a corrected temperature target value of another temperature control zone (slave section) by using the measured value arrival rate of the section).
In Patent Document 3, a value obtained by dividing the integrated value of the manipulated variables in each temperature control zone by the largest value of the integrated values of the manipulated variables in the plurality of temperature control zones is used as an output limiter value of each temperature control zone. By doing so, even when the temperatures of the plurality of temperature control zones interfere with each other, the time required to reach the target temperature of each temperature control zone can be made substantially the same without causing a large peak power. A temperature control device and a temperature control method capable of performing the same are disclosed.

JP, 10-315291, A JP 2005-35090 A International Publication No. 2016/0757586

The technique of Patent Document 3 makes the time required to reach the target temperature of each temperature control zone substantially the same for a control target having a plurality of temperature control zones without causing a large peak power. It is possible and very useful.
However, there are calls for further suppression of peak power. Further, if the peak power is suppressed, the time until the temperature rise is completed becomes longer. Therefore, there is a request to know how much the peak power is suppressed and how long the temperature rise time becomes. .

  In view of the above points, the present invention relates to a temperature control device capable of making the time required to reach the target temperature of each temperature control zone substantially the same for a control target having a plurality of temperature control zones. It is an object of the present invention to provide a temperature control device and a method for estimating the temperature rise completion time that can further suppress the peak power and can estimate the temperature rise completion time that fluctuates due to the suppression of the peak power.

(Structure 1)
A temperature control device for controlling the temperature of a controlled object having a plurality of temperature control zones, wherein each temperature control zone is determined so that the temperature of each temperature control zone reaches a target temperature at the same time. A predetermined output limiter value is multiplied by the total power suppression coefficient common to each temperature control zone to obtain a suppressed output limiter value, and the operation amount for temperature control in the temperature control zone calculated based on the target temperature and the measured temperature is If the suppression output limiter value or less, the calculated operation amount is used as the operation amount, and if the calculated operation amount is larger than the suppression output limiter value, the suppression output limiter value is used as the operation amount. , A temperature controller for controlling the temperature of each temperature control zone, and a reference increase obtained by substituting a reference condition into an approximate expression that approximates the temperature rise characteristics of the controlled object with a first-order lag. The temperature rise time ratio, which is the ratio of the time calculation value and the temperature rise time calculation value obtained by substituting desired setting conditions in the approximate expression, is calculated, and the temperature rise time measured under the reference conditions is A temperature control device comprising: a temperature rise time estimation unit that calculates an estimated temperature rise time by multiplying the temperature rise time multiplication factor.

(Configuration 2)
The temperature control device according to configuration 1, wherein the temperature rise time ratio is calculated by the following formula 1 or a formula obtained by modifying the formula 1 below.

上記式において、Ｃ：昇温時間倍率、Ｂ：総電力抑制係数、θ_SP：昇温後の制御安定時の負荷率。

In the above formula, C: temperature rise time ratio, B: total power suppression coefficient, θ _SP : load factor when control is stable after temperature rise.

(Structure 3)
The temperature control device according to configuration 1, wherein the temperature rise time ratio is calculated by the following formula 2 or a formula obtained by modifying the formula 2.

上記式において、Ｃ：昇温時間倍率、Ｂ：総電力抑制係数、θ_SP：昇温後の制御安定時の負荷率、Ｋ：プロセスゲイン、ΔＹ：基準条件と設定条件における周囲温度の差。

In the above formula, C: temperature rise time ratio, B: total power suppression coefficient, θ _SP : load factor when control is stable after temperature rise, K: process gain, ΔY: difference between ambient temperature under reference conditions and setting conditions.

(Structure 4)
The temperature control device according to configuration 2 or 3, wherein the load factor during stable control after the temperature rise is calculated by the following formula 3 or a formula obtained by modifying this.

上記式において、Ｐ_ｉ：各温度制御ゾーンの熱源の定格電力、θ_SPｉ：各温度制御ゾーンの昇温後の制御安定時の負荷率。

In the above equation, P _{i is} the rated power of the heat source in each temperature control zone, θ _{SPi is} the load factor when the temperature of each temperature control zone is stable and the control is stable.

(Structure 5)
A temperature control method for controlling the temperature of a control target having a plurality of temperature control zones, wherein the temperature control zones are set for each temperature control zone so that the temperatures of the temperature control zones reach the target temperature at the same time. A predetermined output limiter value is the upper limit of the manipulated variable that is the suppression output limiter value that is a value obtained by multiplying the total power suppression coefficient common to each temperature control zone, and the target temperature and the measured temperature are used for temperature control in the temperature control zone. The operation amount is calculated, and when the calculated operation amount is less than or equal to the suppression output limiter value, the calculated operation amount is used as the operation amount, and when the calculated operation amount is greater than the suppression output limiter value, the suppression output limiter A method of estimating temperature rise completion time in a temperature control method for controlling the temperature of each temperature control zone using a value as a manipulated variable, wherein the temperature rise characteristic of the controlled object is Ascending, which is the ratio of the reference temperature increase time calculated value obtained by substituting the reference condition to the approximate expression approximated by the first-order delay and the temperature increase time calculated value obtained by substituting the desired setting condition into the approximate expression. A method for estimating a temperature rise completion time, comprising: calculating a temperature-time multiplication factor, and multiplying the temperature-raising time actually measured under the reference condition by the temperature-raising time factor to calculate an estimated temperature-raising time.

(Structure 6)
6. The method of estimating temperature rise completion time according to the configuration 5, wherein the temperature rise time ratio is calculated by the following formula 4 or a formula obtained by modifying the formula 4 below.

上記式において、Ｃ：昇温時間倍率、Ｂ：総電力抑制係数、θ_SP：昇温後の制御安定時の負荷率。

In the above formula, C: temperature rise time ratio, B: total power suppression coefficient, θ _SP : load factor when control is stable after temperature rise.

(Structure 7)
6. The method of estimating temperature rise completion time according to the configuration 5, wherein the temperature rise time magnification is calculated by the following equation 5 or an equation obtained by modifying the equation.

上記式において、Ｃ：昇温時間倍率、Ｂ：総電力抑制係数、θ_SP：昇温後の制御安定時の負荷率、Ｋ：プロセスゲイン、ΔＹ：基準条件と設定条件における周囲温度の差。

In the above formula, C: temperature rise time ratio, B: total power suppression coefficient, θ _SP : load factor when control is stable after temperature rise, K: process gain, ΔY: difference between ambient temperature under reference conditions and setting conditions.

(Structure 8)
8. The method for estimating the temperature rise completion time according to the configuration 6 or 7, wherein the load factor at the time of stable control after the temperature rise is calculated by the following formula 6 or a formula obtained by modifying it.

上記式において、Ｐ_ｉ：各温度制御ゾーンの熱源の定格電力、θ_SPｉ：各温度制御ゾーンの昇温後の制御安定時の負荷率。

In the above equation, P _{i is} the rated power of the heat source in each temperature control zone, θ _{SPi is} the load factor when the temperature of each temperature control zone is stable and the control is stable.

  According to the temperature control device of the present invention, in the temperature control device capable of making the time required to reach the target temperature of each temperature control zone substantially the same, the peak power is further suppressed and the peak power is reduced. It is possible to estimate the temperature rise completion time that fluctuates due to the suppression of.

Block diagram showing an outline of the configuration of a temperature control device of an embodiment according to the present invention Block diagram showing the outline of the configuration of the temperature control unit Schematic explanatory view showing a plastic molding machine having _N temperature control zones 1 ₁ to 1 _{N in} which the temperatures interfere with each other. A graph showing experimental results of temperature control when the temperature control method disclosed in Patent Document 3 is used. The graph which shows the experimental result of the temperature control when the temperature control method in the embodiment is used The graph which shows the experimental result of the temperature control when the temperature control method in the embodiment is used

The present invention is a temperature control device for controlling the temperature of a controlled object having a plurality of temperature control zones, and an operation in each temperature control zone is performed so that the temperature of each temperature control zone reaches a target temperature at the same time. It is a technique used for temperature control devices where the quantity is controlled. In the present invention, in order to suppress the peak power of the conventional device that is controlled so that the temperature rising time of each temperature control zone is the same, the operation amount (temperature rising time of each temperature control zone is The operation amount controlled to match) is multiplied by the total power suppression coefficient common to each temperature control zone. Further, the present invention is a temperature control device and a method of estimating the temperature rise completion time capable of estimating the temperature rise completion time that fluctuates as the peak power is suppressed.
In the embodiment described below, as a method of “controlling the manipulated variable in each temperature control zone so that the temperature of each temperature control zone reaches the target temperature at the same time” to which the present invention is applied, Patent Document 3 The technology disclosed in is used.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The following embodiment is one mode for embodying the present invention, and does not limit the present invention within the scope thereof.

The temperature control device 100 of the present embodiment controls the temperature of a controlled object having N (N is an integer of 1 or more) temperature control zones in which the temperatures interfere with each other, such as the plastic molding machine shown in FIG. Control.
FIG. 1 is a block diagram showing an outline of the configuration of the temperature control device of the present embodiment.
As shown in FIG. 1, the temperature control device 100 of the present embodiment includes a display unit 120 that displays various kinds of information, an input unit 130 to which a user inputs a set value, an operation instruction, and the like. The warm time estimation unit 110 and the temperature control unit 140 are provided.
The display unit 120 is composed of, for example, a liquid crystal panel or the like, and also displays the estimated value of the temperature increase completion time calculated by the temperature increase time estimation unit 110 described below.
The input unit 130 in this embodiment has a function as a UI that receives an input from a user, and also a function that receives a signal input from another device (for example, a temperature controller).

FIG. 2 is a block diagram showing a schematic configuration of the temperature control unit 140.
The temperature control unit 140 includes temperature control means 10 ₁ to 10 _N corresponding to the _N temperature control zones 1 ₁ to 1 _N , respectively, and controls power supply to the heaters 2 ₁ to 2 _N. By performing each, the temperature control for each temperature control zone 1 ₁ to 1 _N is performed.
Each of the temperature control means 10 ₁ to 10 _N has the same configuration, and switches the signals of the correction target temperature setting unit 11, the target temperature setting unit 12, the correction target temperature setting unit 11 and the target temperature setting unit 12 to change the SV value. The output changeover switch 13, the temperature measuring unit 14 for measuring the temperature (PV value) of the temperature control zone, the difference calculating unit 15 for calculating the difference between the PV value and the SV value from the changeover switch 13, the SV value and the PV value The PID control calculation unit 16 that calculates the MV value by performing the PID control based on the difference between the calculated MV value and the suppression output limiter value output from the total power suppression coefficient multiplication unit 60 described below. By comparison, an output limiter 17 that outputs the MV value if the MV value is less than or equal to the suppression output limiter value, and outputs the suppression output limiter value if the MV value exceeds the suppression output limiter value. It comprises a changeover switch 18, to output as MV by switching the signal of the output limiter 17 and the PID control calculation unit 16.
As described above, the temperature control device 100 according to the present embodiment is a method of "controlling the manipulated variable in each temperature control zone so that the temperature of each temperature control zone reaches the target temperature at the same time". 3 is used, and the only difference between the temperature control unit 140 and Patent Document 3 is the total power suppression coefficient multiplication unit 60.
The parts other than the total power suppression coefficient multiplication unit 60 have the same configuration and processing concept as in Patent Document 3, and therefore a simplified description will be given here. The processing concept related to the same configuration as in Patent Document 3 is to use an output limiter value for matching the temperature rising times and suppressing the peak power for each of the temperature control zones 1 ₁ to 1 _N. The output limiter value is measured once by raising the temperature of the temperature control zones 1 ₁ to 1 _N once with an operation amount controlled so that the temperature raising completion times of the temperature control zones 1 ₁ to 1 _N are coincident with each other. It is calculated by dividing the integrated value of the operation amount of each temperature control zone by the largest value among the integrated values of the operation amount of each temperature control zone.
To be more specific, first, the temperature control zones 1 ₁ to 1 _N are raised by SV ₁ ′ (corresponding to the manipulated variable controlled so that the temperature raising times coincide with each other) set by the correction target temperature setting unit 11. The temperature is once (the changeover switch 13 outputs SV ₁ ′ from the correction target temperature setting unit 11, the changeover switch 18 outputs MV ₁ from the PID control calculation unit 16), and the operation amount for each temperature control zone at this time The integrated value of is stored in the operation amount integrated value storage unit 40.
Next, in the output limiter value calculation unit 50, the operation amount of each temperature control zone is set to the largest value among the integrated values of the operation amount for each temperature control zone stored in the operation amount integrated value storage unit 40. by dividing the integrated value by the output limiting value L ₁ ~L N corresponding to each of the temperature control zones 1 ₁ to 1 _{N (as} described above, the maximum amount of operation of the integrated value (the maximum value of the output), the temperature A value of 0 to 1 obtained by normalizing the integrated value of the manipulated variables of the control zone) is calculated.
In the temperature increase control after the output limiter values L _{1 to} L _N are obtained, the changeover switch 13 outputs the target temperature setting unit 12 (for example, SV input from the temperature controller), and the changeover switch 18 outputs the output limiter. The output from 17 is switched to select each. The output limiter 17 outputs the MV value as it is if the MV value from the PID control calculation unit 16 is less than or equal to the output limiter value, and if the MV value from the PID control calculation unit 16 exceeds the output limiter value. Output the output limiter value. Thereby, the operation amount for controlling the power supply to the heater is controlled with the output limiter value corresponding to each temperature control zone 1 ₁ to 1 _N as the upper limit. The technique of Patent Document 3 is to match the temperature rising times and suppress the peak power by the above processing.

In the temperature control device 100 of the present embodiment, the total power suppression coefficient multiplication unit 60 is provided in addition to the technique of Patent Document 3, so that the output limiter value for each temperature control zone described above can be used for each temperature. By multiplying the total power suppression coefficient (0 <total power suppression coefficient <1) common to the control zones, the “suppressed output limiter value” in which the output limiter value is further limited is calculated. The output limiter 17 outputs the MV value as it is if the MV value from the PID control calculation unit 16 is less than or equal to the suppression output limiter value, and when the MV value from the PID control calculation unit 16 exceeds the suppression output limiter value. Outputs the suppression output limiter value.
As a result, in the temperature control device 100 of the present embodiment, the temperature rise completion time of each temperature control zone is made to coincide with each other, and the peak power is further suppressed.
That is, in the temperature control of the control target having a plurality of temperature control zones, the temperature control unit 140 in the temperature control device 100 of the present embodiment ensures that the temperature of each temperature control zone reaches the target temperature at the same time. The target output temperature and the measured temperature are set as the upper limit of the manipulated variable, which is the suppression output limiter value, which is the product of the predetermined output limiter value set for each temperature control zone and the total power suppression coefficient that is common to each temperature control zone. The operation amount for temperature control in the temperature control zone is calculated from, and when the calculated operation amount is less than or equal to the suppression output limiter value, the calculated operation amount is used as the operation amount, and the calculated operation amount is the suppression output. When it is larger than the limiter value, the suppression output limiter value is used as the manipulated variable to control the temperature of each temperature control zone.

Here, it was confirmed by an experiment that the temperature control device 100 of the present embodiment can further suppress the peak power while making the temperature rising completion time of each temperature control zone the same.
4 to 6 are graphs showing experimental results of an experiment in which the temperature of each temperature control zone is raised to 100 degrees in the plastic molding machine having four temperature control zones shown in FIG.
FIG. 4 is an experimental result when the temperature control method disclosed in Patent Document 3 is used, and FIGS. 5 and 6 show the total power suppression coefficient in the temperature control device 100 of the present embodiment as 0.8 ( FIG. 7 is a graph showing the results of an experiment conducted with FIG. 5) and 0.6 (FIG. 6).
As shown in FIGS. 4 to 6 as “PV for each CH (that is, measured temperature of each temperature control zone)”, in the case of control by the temperature control device 100 of the present embodiment (FIGS. 5 and 6), It was possible to match the temperature rising completion time of each temperature control zone at a level comparable to the control of Patent Document 3 (FIG. 4).
Further, in the case of the control by the temperature control device 100 of the present embodiment (FIGS. 5 and 6), as shown as “total power ΣMV of 4CH” in FIGS. It was possible to further suppress the peak power.

Here, as also shown in FIGS. 4 to 6, by using the suppression output limiter value in which the output limiter value is further restricted by the total power suppression coefficient, the time until the temperature rise is completed becomes longer. Specifically, in the control of FIG. 4 (FIG. 4), the temperature rise is completed in about 32 minutes, whereas when the total power suppression coefficient is 0.8 (FIG. 5), the temperature rise is completed. When the completion time is about 43 minutes and the total power suppression coefficient is 0.6 (FIG. 6), the temperature increase completion time is about 58 minutes, which is long.
In this regard, the temperature control device 100 of the present embodiment is provided with the temperature increase time estimation unit 110, so that it is possible to calculate the estimated value of the temperature increase completion time that increases according to the total power suppression coefficient.
The temperature rise time estimation unit 110 substitutes a reference temperature rise time calculated value obtained by substituting the reference condition into an approximate expression that approximates the temperature rise characteristic of the control target with a first-order delay, and a desired setting condition into the approximate expression. The temperature rise time ratio, which is the ratio to the calculated temperature rise time value, is calculated, and the estimated temperature rise time is calculated by multiplying the temperature rise time actually measured under the reference conditions by the temperature rise time ratio. It is to be calculated.

  A calculation formula for calculating the estimated value of the temperature rise completion time will be described.

First, the process gain K is a value that means the coefficient of the fluctuation range of the manipulated variable (electric power) and the fluctuation range of the controlled variable, and the final value of the controlled variable (temperature) when the manipulated variable = P ₁ is Y ₁ When the final value of the control amount when the amount = P ₂ is Y ₂ , it is a value represented by Expression 7. However, the operation amount is generally a load factor θ which is a value normalized by the maximum value P _MAX of the operation amount. Is expressed by Equation 7. That is, the load factor corresponding to the maximum value of the operation amount corresponds to the maximum operation amount normalized by the maximum value of the operation amount.

Further, in the control theory, the relationship between the manipulated variable and the final value of the controlled variable is treated as linear (K is the same value regardless of the values of Y and P), and generally, the manipulated variable P is the maximum value P thereof. A value normalized by _MAX (hereinafter, this value is referred to as a load factor θ) is used. If defined in this way, the relationship between the change width Y (Y = Y ₂ −Y ₁ ) of the final value of the controlled variable (temperature) and the change width θ (θ = θ ₂ −θ ₁ ) of the load factor is that K is a coefficient. It is expressed by the equation 8.

  Next, related variables and their relational expressions are defined as shown in Table 1 below.

  The "mathematical expression expressing the step response of the controlled variable (an expression that approximates the controlled object with a temporary delay)" in Table 1 is repeated as the mathematical expression 9.

Here, when Ta is calculated by substituting y (t) = Ysp, t = Ta, θ = 1, and Ye = Y ₀ into Equation 9, Equation 10 is obtained. This Ta is a "reference temperature increase time calculated value obtained by substituting the reference condition into an approximate expression that approximates the temperature increase characteristics of the controlled object with a first-order delay".

Next, by substituting y (t) = Ysp, t = Tb, θ = B, and Ye = Y ₀ + ΔY into Expression 9, and Tb is calculated, Expression 11 is obtained. This Tb is "a temperature rise time calculation value obtained by substituting desired setting conditions into an approximate expression that approximates the temperature rise characteristics of the controlled object with a first-order delay".

Here, if θ _SP = (Y _SP −Y ₀ ) / K and C = Tb / Ta is obtained, Equation 12 is obtained.

C obtained by the equation 12 is “the reference temperature rise time calculated value (Ta) obtained by substituting the reference condition into the approximation formula that approximates the temperature rise characteristic of the controlled object by the first-order delay, and the desired value for the approximation formula. It is a ratio of a temperature rise time calculation value (Tb) obtained by substituting the setting conditions, that is, a temperature rise time magnification ”.
Expression 12 is the case where the maximum value of the manipulated variable is set to a value (desired setting condition) obtained by multiplying the maximum value of the manipulated variable up to that time (standard condition) by the coefficient B, and the ambient temperature is Y ₀ (standard condition). This is a mathematical expression for calculating how many times the time required to reach the target temperature becomes when compared with the reference condition when the condition is deviated by ΔY (desired setting condition).

However, Equation 12 is a mathematical expression in which the controlled object is derived as one controlled object, but in the case of a controlled object having a plurality of temperature control zones, the load factor θ _SPi when it stabilizes at the target value is Since the values are different, it is necessary to calculate one load factor θ _SP to be used for this calculation. Formula 13 below is a formula for calculating the load factor θ _SP to be substituted into Formula 12. In Expression 13, P _i is the rated power of the heat source (heater) in each temperature control zone, and θ _SPi is the load factor when the temperature of each temperature control zone is stable and the control is stable.

When the amount of operation (load factor) applied to the controlled object is A, and the time required for the temperature (controlled amount) of the controlled object to reach the target value is Ta, and the temperature of the controlled object (control Target value when the maximum value of the manipulated variable (load factor) is A / B, when the manipulated variable (load factor) is θ _SP when a sufficient amount of time has elapsed in a stable state The time Tc required for reaching can be calculated by Expression 14.

From the above, if Ta and θ _SP are measured in advance, the time Tc required to raise the temperature can be calculated by Equation 14 when the operation amount (load factor) is A · B. That is, once the actual temperature rise control is actually performed in the actual machine and Ta, which is the temperature rise time under the reference conditions, the load factor θ _SP at the time of temperature stabilization, and the process gain K are measured, An estimated value of the temperature increase completion time can be calculated when the suppression coefficient B is changed or when the ambient temperature is changed (desired setting condition). The load factor θ _SP when the temperature is stable is the load factor when the control is stable after the temperature is raised (the control target is stable at the target temperature).

In the temperature control device 100 of the present embodiment, the temperature increase time estimation unit 110 calculates the estimated value of the temperature increase completion time.
Specifically, temperature increase control is performed in advance on an actual machine, and Ta, θ _SP , and K (reference conditions) measured by this are acquired, and these values are stored in the temperature increase time estimation unit 110.
In the temperature increase control to be performed thereafter, when the user inputs the set value of the total power suppression coefficient B and the ambient temperature information (desired setting condition) from the input unit 130, the temperature increase time estimation unit 110 uses the expressions 12 and 14. An estimated value of the temperature rise completion time is calculated based on this, and this is output to the display unit 120. The user can know the estimated value of the temperature rise completion time when setting the temperature rise control, which is very convenient.
In the control, the characteristics of the controlled object are generally approximated by “temporary delay + waste time”, but in the description so far, the waste time has been omitted. Therefore, the case of including the waste time will be described below. To do.
Since the waste time is a constant value regardless of the coefficient for the manipulated variable, the waste time is simply subtracted from the time required from the start of temperature rise to the completion of temperature rise, the previous period is calculated, and the waste time is added after the calculation. Then, the time required to reach the target value in the case of “temporary delay + waste time” when the output limiter value is set to the output limiter value × total power suppression coefficient B can be calculated.

Ta and the like were measured in the experiment of FIG. 4 by setting the experiment shown in FIG. 4 as “temperature increase control under reference conditions performed in advance on an actual machine”. The estimated value of the temperature rise completion time calculated by the above-mentioned calculation method using the actual measurement value under the reference condition, B = 0.8 and ΔY = 0.0 ° C. as the “desired setting condition” is about It was 41.5 minutes. Further, when the “desired setting conditions” are B = 0.6 and ΔY = 2.0 ° C., the estimated value of the temperature increase completion time calculated by the above calculation method was about 57.4 minutes. .
Table 2 summarizes these conditions.

  B = 0.8 and ΔY = 0.0 ° C. are the experimental conditions of FIG. 5, and as shown in FIG. 5, the actual heating completion time was about 43 minutes. Further, B = 0.6 and ΔY = 2.0 ° C. are the experimental conditions in FIG. 6, and the actual temperature rising completion time was about 58 minutes. It was confirmed that the estimated values (about 41.5 minutes, about 57.4 minutes) calculated by the above method are values close to the actual heating completion time and have practical accuracy.

As described above, according to the temperature control device 100 of the present embodiment, the total power suppression coefficient (0 <total power suppression coefficient <1) common to the temperature control zones is set for the output limiter value for each temperature control zone. By multiplying it by the “suppressed output limiter value”, which is a more limited output limiter value, as the upper limit of the manipulated variable, it is possible to further suppress the peak power while making the temperature rise completion time of each temperature control zone match. can do.
In addition, since it is possible to calculate an estimated value of the temperature rise completion time that varies depending on the setting of the total power suppression coefficient, it is highly convenient.

In the present embodiment, in the calculation of the estimated value of the temperature rise completion time, the difference (ΔY) in the ambient temperature is also used as a parameter, and this is input by the user. However, the temperature sensor is provided. Therefore, the ambient temperature may be automatically measured and ΔY which is the difference from the “reference condition” may be automatically calculated.
Further, for example, when the installation environment of the device is basically temperature controlled and it is not necessary to consider the difference in ambient temperature, by not using ΔY in Equation 12 (ΔY = 0), It may be simplified as 15.

In the present embodiment, the formula 12 (or the formula 15) and the formula 14 are shown as the form of the formula for calculating the estimated value of the temperature rise completion time, but the form of the formula is not limited to this, and these formulas are not limited thereto. Of course, it does not matter even if the formula is appropriately modified and used.
Further, in the present embodiment, the temperature rise time estimation unit 110 has been described as performing the calculation process based on the equations 12 and 14, but based on the equation 12 (or the equation 15), the increase corresponding to each condition in advance is performed. The temperature-time magnification C is calculated in advance, and the temperature-rise time magnification C corresponding to each condition is set in the apparatus as a table. The temperature-rise time estimation unit 110 calculates the estimated value of the temperature-rise completion time. , C may be obtained from the table and only the calculation based on Expression 14 may be performed.

In the present embodiment, the case where the present invention is used in an apparatus for controlling the temperature of a plurality of temperature control zones where the temperatures interfere with each other has been described as an example. Of course, it can be used for the target.
Further, in the present embodiment, a method of “controlling the manipulated variable in each temperature control zone so that the temperature of each temperature control zone reaches the target temperature in the same time” in the temperature control device to which the present invention is applied Although the method of Patent Document 3 is used as an example, the present invention can be applied to a method of synchronizing the temperature raising time by another method.

100. ． ． Temperature control device 110. ． ． Temperature rising time estimation unit 140. ． ． Temperature control unit 1 ₁ to 1 _N. ． ． Temperature control zone 10 ₁ to 10 _N. ． ． Temperature control means 50. ． ． Total power suppression coefficient multiplier

Claims (8)

A temperature control device for controlling the temperature of a controlled object having a plurality of temperature control zones, wherein each temperature control zone is determined so that the temperature of each temperature control zone reaches a target temperature at the same time. A predetermined output limiter value is multiplied by the total power suppression coefficient common to each temperature control zone to obtain a suppressed output limiter value, and the operation amount for temperature control in the temperature control zone calculated based on the target temperature and the measured temperature is If the suppression output limiter value or less, the calculated operation amount is used as the operation amount, and if the calculated operation amount is larger than the suppression output limiter value, the suppression output limiter value is used as the operation amount. A temperature control unit for controlling the temperature of each temperature control zone,
Reference temperature increase time calculated value obtained by substituting reference conditions into an approximate expression that approximates the temperature increase characteristics of the controlled object with a first-order delay, and temperature increase time obtained by substituting desired setting conditions into the approximate expression A temperature rise time estimation unit that calculates an estimated temperature rise time by calculating a temperature rise time ratio that is a ratio with a calculated value, and multiplying the temperature rise time actually measured under the reference condition by the temperature rise time ratio. When,
A temperature control device comprising: The temperature control device according to claim 1, wherein the temperature rise time ratio is calculated by the following formula 1 or a formula obtained by modifying the formula 1 below.

In the above formula, C: temperature rise time ratio, B: total power suppression coefficient, θ _SP : load factor when control is stable after temperature rise. The temperature control device according to claim 1, wherein the temperature rise time ratio is calculated by the following expression 2 or an expression obtained by modifying the expression 2.

In the above formula, C: temperature rise time ratio, B: total power suppression coefficient, θ _SP : load factor when control is stable after temperature rise, K: process gain, ΔY: difference between ambient temperature under reference conditions and setting conditions. The temperature control device according to claim 2 or 3, wherein the load factor at the time of stable control after the temperature rise is calculated by the following formula 3 or a formula obtained by modifying this.

In the above equation, P _{i is} the rated power of the heat source in each temperature control zone, θ _{SPi is} the load factor when the temperature of each temperature control zone is stable and the control is stable. A temperature control method for controlling the temperature of a control target having a plurality of temperature control zones, wherein the temperature control zones are set for each temperature control zone so that the temperatures of the temperature control zones reach the target temperature at the same time. A predetermined output limiter value is the upper limit of the manipulated variable that is the suppression output limiter value that is a value obtained by multiplying the total power suppression coefficient common to each temperature control zone, and the target temperature and the measured temperature are used for temperature control in the temperature control zone. The operation amount is calculated, and when the calculated operation amount is less than or equal to the suppression output limiter value, the calculated operation amount is used as the operation amount, and when the calculated operation amount is greater than the suppression output limiter value, the suppression output limiter Using the value as a manipulated variable, in the temperature control method for controlling the temperature of each temperature control zone, a method of estimating the temperature rise completion time,
Reference temperature increase time calculated value obtained by substituting reference conditions into an approximate expression that approximates the temperature increase characteristics of the controlled object with a first-order delay, and temperature increase time obtained by substituting desired setting conditions into the approximate expression The estimated temperature rise time is calculated by calculating a temperature rise time ratio that is a ratio with the calculated value, and multiplying the temperature rise time actually measured under the reference condition by the temperature rise time ratio. Method for estimating the temperature rise completion time. The method of estimating the temperature rise completion time according to claim 5, wherein the temperature rise time magnification is calculated by the following formula 4 or a formula obtained by modifying the formula 4 below.

In the above formula, C: temperature rise time ratio, B: total power suppression coefficient, θ _SP : load factor when control is stable after temperature rise. The method of estimating the temperature rise completion time according to claim 5, wherein the temperature rise time magnification is calculated by the following formula 5 or a formula obtained by modifying the formula 5 below.

In the above formula, C: temperature rise time ratio, B: total power suppression coefficient, θ _SP : load factor when control is stable after temperature rise, K: process gain, ΔY: difference between ambient temperature under reference conditions and setting conditions. The method of estimating the temperature rise completion time according to claim 6 or 7, wherein the load factor at the time of stable control after the temperature rise is calculated by the following formula 6 or a formula obtained by modifying this.

In the above equation, P _{i is} the rated power of the heat source in each temperature control zone, θ _{SPi is} the load factor when the temperature of each temperature control zone is stable and the control is stable.

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