JP2013041317A - Control device and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent instantaneous total energy from exceeding a fixed value and to heighten a probability of suppressing generation of overshoot of temperature.SOLUTION: A control device includes: a heat-up power amount prediction part 3 for predicting heat-up power amount PWi of each control loop Li; a heat-up execution order determination part 4 for determining that an order from a control loop of a large heat-up power amount PWi to a control loop of a small heat-up power amount is a heat-up execution order of the respective control loops Li; a heat-up target selection part 5 for selecting a control loop whose temperature is to be raised according to the heat-up execution order, when a first heat-up is started, or when it is determined that operation amount decreases and surplus of the power is generated, due to progress of the heat-up of the control loop whose temperature is to be raised; a power restriction operation part 6 for performing restriction operation of power to be supplied to a heater of each control loop Li; and a control part 7-i provided at each control loop Li.

Description

  The present invention relates to a control device and a control method for a multi-loop control system including a plurality of control loops.

  With the revision of the law caused by the global warming problem, there is a strong demand for energy usage management in factories and production lines. Since heating devices and air conditioners in factories are equipment devices that use a large amount of energy, they are often managed so that the upper limit of the amount of energy used is lower than the original maximum amount. For example, in an equipment device that uses electric power, an operation is performed to limit the amount of electric power used within a specific instantaneous power consumption amount according to an instruction from a power demand management system.

  In particular, in a heating apparatus including a plurality of electric heaters, Patent Documents 1 to 5 are patented in order to suppress instantaneous total power that is simultaneously supplied at the time of start-up (at the time of simultaneous temperature increase in a region where a plurality of electric heaters are installed). A technique as disclosed in Document 4 has been proposed. FIG. 6 shows an example of a heating device targeted by the control device disclosed in Patent Literature 1 to Patent Literature 4. A silicon wafer 105 is carried into the quartz tube 104 in the oxidation diffusion furnace 100. Temperature sensors 102-1 to 102-3 measure temperatures PV of control zones Z1 to Z3 heated by heaters 103-1 to 103-3, respectively. The controllers 101-1 to 101-3 calculate the operation amount MV so that the temperatures PV measured by the temperature sensors 102-1 to 102-3 coincide with the temperature set value SP, and the heaters 103-1 to 103 are calculated. To -3. Thus, the oxygen introduced into the quartz tube 104 in the oxidation diffusion furnace 100 and the silicon wafer 105 are heated to form an oxide film on the surface of the silicon wafer 105. In the heating apparatus shown in FIG. 6, three control loops for controlling the temperature PV of the control zones Z1 to Z3 to which the respective controllers 101-1 to 101-3 respectively correspond are formed.

Next, techniques disclosed in Patent Documents 1 to 4 will be described. In the reflow device disclosed in Patent Document 1, in order to reduce the current consumption at the time of start-up, the next heater is started after the vicinity of the heater is thermally saturated and the start-up time zone is shifted. It was like that.
In the semiconductor wafer processing apparatus disclosed in Patent Document 2, power is supplied to each heater while being shifted in time so that large power (instantaneous power) is not consumed at the time of startup. .

In the substrate processing apparatus disclosed in Patent Document 3, in order to reduce the maximum power (instantaneous power) simultaneously supplied from the power supply unit, each heat treatment unit is sequentially started up one by one in accordance with a predetermined startup sequence. I was going to go.
In the heating device disclosed in Patent Document 4, in order to prevent power failure due to excessive current consumption at the time of starting up the device, first, the necessary power is supplied to the heater located below the conveyor, and from the conveyor. By limiting the power supplied to the heater located above, the total power consumption (instantaneous power) is controlled below a certain value, and the temperature is switched below as a switching parameter as the temperature inside the furnace rises. Control was made to reduce the power supplied to the heater.

Japanese Patent No. 2885047 JP-A-11-126743 JP-A-11-204412 Japanese Patent No. 4426155

  Since the techniques disclosed in Patent Documents 1 to 4 are all a system in which a plurality of heaters are provided with time difference to supply electric power to raise the temperature, depending on the order of raising the temperature, the temperature between the control loops Due to the interference, a large overshoot occurs in the temperature PV of the control loop, which had previously increased in temperature. When such an overshoot occurs, the time until the settling state of the control is obtained becomes long, and the apparatus operating efficiency is impaired. If the temperature raising time is not shifted in consideration of the order in which the occurrence of overshoot can be suppressed, there is a problem that the probability of impairing the apparatus operating efficiency increases.

  The present invention has been made to solve the above-described problems, and relates to a plurality of control systems having temperature interference between control loops, and step response control (step change of the set value SP is performed to follow the set value SP). In a state where the control function is used as a control), the overshoot of the temperature PV is generated so that the instantaneous total energy (for example, the instantaneous total power) does not exceed a specified constant value (for example, the allocated instantaneous total power). It is an object of the present invention to provide a control device and method in which step response control is performed so that the probability of being suppressed is high.

  The control device of the present invention predicts, for each control loop Li, a temperature increase energy amount PWi that is an energy usage amount of the heater required when the temperature of the control zone of each control loop Li (i = 1 to n) is increased. A temperature rising energy amount predicting means to perform, a temperature rising execution order determining means for determining the order of increasing the temperature rising energy amount PWi of each control loop Li from the larger one to the smaller as the temperature rising execution order of each control loop Li, When the temperature rise starts, or when it is determined that the operation amount of the control loop decreases and the energy margin is generated due to the temperature rise of the control loop targeted for temperature rise, the temperature rise is performed according to the temperature rise execution sequence. The temperature increase target selection means for selecting the target control loop, and the sum of the energy supplied to the heaters of each control loop Li is within the predetermined allocated instantaneous total energy PT, and the temperature increase target Energy limiting operation means for limiting the energy supplied to the heaters of each control loop Li so that energy is preferentially supplied to the heaters of the control loops, and a temperature set value SPi provided for each control loop Li An operation amount MVi is calculated by control calculation with the temperature PVi as an input, and an upper limit process is performed to limit the operation amount MVi according to the setting of the energy limiting operation means, and the operation amount MVi after the upper limit process is set in the corresponding control loop Li. And a control means for outputting to the heater.

Further, in one configuration example of the control device of the present invention, the energy limiting operation unit performs an operation of limiting the energy supplied to the heater of each control loop Li, and sets the operation amount upper limit value OHi of the control unit of each control loop Li. It is characterized by being performed by changing.
Further, in one configuration example of the control device according to the present invention, the temperature increase target selecting means increases the temperature of the control loop targeted for temperature increase when the temperature of the control loop targeted for temperature increase reaches the temperature set value. Thus, it is determined that the operation amount has decreased and an energy margin has occurred.

  In addition, the control device of the present invention sets the temperature increase power amount PWi, which is the amount of heater power used when increasing the temperature of the control zone of each control loop Li (i = 1 to n), for each control loop Li. Temperature rising power amount predicting means that predicts the temperature rising power amount PWi of each control loop Li, and the temperature rising power execution order determining means for determining the order from the larger one to the smaller heating power amount PWi as the temperature rising execution order of each control loop Li When the first temperature increase starts or when it is determined that the operation amount of the control loop decreases and the power margin is generated due to the temperature increase of the control loop targeted for temperature increase, the temperature increase execution sequence is followed. The temperature increase target selection means for selecting the temperature increase target control loop and the sum of the electric power supplied to the heaters of each control loop Li are within the predetermined allocated instantaneous total power PT, and the temperature increase target control loop heater Prioritize power As shown, the power limiting operation means for limiting the power supplied to the heaters of each control loop Li, and the control amount MVi are provided for each control loop Li by the control calculation with the temperature set value SPi and the temperature PVi as inputs. And an upper limit process for limiting the manipulated variable MVi in accordance with the setting of the power limit operating means, and a control means for outputting the manipulated variable MVi after the upper limit process to the heater of the corresponding control loop Li. It is a feature.

Further, in one configuration example of the control device of the present invention, the power limiting operation unit performs a limiting operation of power supplied to the heater of each control loop Li, and sets an operation amount upper limit value OHi of the control unit of each control loop Li. It is characterized by being performed by changing.
Further, in one configuration example of the control device according to the present invention, the temperature increase target selecting means increases the temperature of the control loop targeted for temperature increase when the temperature of the control loop targeted for temperature increase reaches the temperature set value. Thus, it is determined that the operation amount has decreased and a power margin has occurred.

  Further, the control method of the present invention is configured to calculate the temperature rise energy amount PWi, which is the amount of heater energy used when raising the temperature of the control zone of each control loop Li (i = 1 to n), for each control loop Li. A temperature rising energy amount prediction step that predicts the temperature rising energy amount PWi, and a temperature rising energy execution order determining step that determines the order of increasing the temperature rising energy amount PWi of each control loop Li from the larger one to the smaller temperature rising execution order of each control loop Li; When the first temperature increase starts or when it is determined that the operation amount of the control loop is lowered due to the temperature increase of the control loop targeted for temperature increase and an energy margin is generated, the temperature increase execution sequence is followed. The temperature increase target selection step for selecting the temperature increase target control loop and the sum of the energy supplied to the heaters of each control loop Li are within the predetermined allocated instantaneous total energy PT. And an energy limiting operation step for limiting the energy supplied to the heaters of each control loop Li so that energy is preferentially supplied to the heaters of the control loops to be heated, and the temperature set value SPi and the temperature PVi. The operation amount MVi is calculated by control calculation using the input, and an upper limit process is performed to limit the operation amount MVi according to the setting of the energy limiting operation step, and the operation amount MVi after the upper limit process is applied to the heater of the corresponding control loop Li. And a control step for outputting.

  In addition, the control method of the present invention determines the heating power amount PWi, which is the amount of heater power used when raising the temperature of the control zone of each control loop Li (i = 1 to n), for each control loop Li. A temperature rising power amount prediction step that predicts the temperature rising power amount, and a temperature rising power execution order determination step that determines the order of increasing the power rising power amount PWi of each control loop Li from the smaller one as the temperature rising execution order of each control loop Li When the first temperature increase starts or when it is determined that the operation amount of the control loop decreases and the power margin is generated due to the temperature increase of the control loop targeted for temperature increase, the temperature increase execution sequence is followed. The temperature increase target selection step for selecting the control loop for the temperature increase, and the sum of the electric power supplied to the heaters of each control loop Li is within the predetermined allocated instantaneous total power PT, and priority A power limiting operation step for limiting the power supplied to the heater of each control loop Li, and an operation amount MVi is calculated by a control calculation using the temperature set value SPi and the temperature PVi as inputs, And a control step of executing an upper limit process for limiting the manipulated variable MVi according to the setting of the power limiting operation step and outputting the manipulated variable MVi after the upper limit process to the heater of the corresponding control loop Li. It is.

  According to the present invention, the order from the larger temperature increase energy amount PWi to the smaller one is determined as the temperature increase execution order of each control loop Li, and the temperature increase target control loop is selected according to the temperature increase execution order. By limiting the energy supplied to the heater of each control loop Li, the instantaneous total energy supplied to the heater of each control loop Li is prevented from exceeding a predetermined allocated instantaneous total energy PT, and each control loop Li The probability of suppressing the occurrence of overshoot of the temperature PVi can be increased.

  Further, in the present invention, the order from the larger heating power amount PWi to the smaller heating power is determined as the heating execution order of each control loop Li, and the control loop to be heated is selected according to the heating execution order. Thus, it is possible to increase the probability that the instantaneous total power supplied to the heaters of each control loop Li does not exceed the predetermined allocated total instantaneous power PT and the occurrence of overshoot of the temperature PVi of each control loop Li can be suppressed.

It is a block diagram which shows the structure of the control apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart explaining operation | movement of the control apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the operation example of the control apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the operation example of the control apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the control apparatus which concerns on the 3rd Embodiment of this invention. It is a figure which shows the structural example of the heating apparatus provided with the several electric heater.

[Principle of the Invention]
In the present invention, “electric power” that is instantaneously consumed for a certain short period of time and “electric energy” that is cumulatively required to complete the temperature increase are handled.
In the present invention, it is assumed that the power usage amount prediction method disclosed in Japanese Patent No. 4468868 is applied. In multiple control systems where temperature interference exists between control loops, overshoot occurs when the temperature of each control system (each control loop) rises from almost the same low temperature to almost the same high temperature. The following two points (A) and (B) can be focused on as a mechanism that makes it difficult to perform.

(A) When each control loop uses a heater having substantially the same capacity, the temperature raising capability of each control loop is substantially the same, and the temperature raising capability is determined by the height of the manipulated variable MV in the equilibrium state before and after the temperature elevation. . A control loop with a larger predicted heating power amount has a temperature lowering capability, so it is easier to cope with overshoot due to thermal interference.

(B) When the heater capacities greatly differ among a plurality of control loops, the influence of thermal interference on the adjacent loops is less as the control loop has a smaller heating power predicted value due to the smaller heater capacity. Less likely to adversely affect adjacent loops that have already been heated.

  As described above, by predicting the temperature rising power amount of each control loop and preferentially raising the temperature by giving priority to the control loop having a large predicted temperature rising power amount, there is a high probability that the occurrence of temperature overshoot can be suppressed. Become. Specifically, the manipulated variable MV or the manipulated variable upper limit value is limited so that the instantaneous total power does not exceed a specified constant value (for example, the allocated instantaneous total power). The restriction on the manipulated variable MV or the manipulated variable upper limit value is eased by giving priority to a large control loop. By doing so, it becomes easier to sequentially raise the temperature so that unnecessary standby time and overshoot are reduced as a result.

In the case of a general-purpose controller such as a temperature controller, the technology is mounted in a state where the balance of the capacities of a plurality of heaters cannot be assumed in advance, and is distributed to device manufacturers and the like. Therefore, the provision of a method that can be handled in common between the case where each control loop uses a heater having substantially the same capacity and the case where the heater capacities differ greatly in each control loop leads to an expansion of the practical range.
Note that the above principle is not limited to temperature increase control, and similarly applies to temperature decrease control using a cooling device that consumes power.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a control device according to the first embodiment of the present invention.
The control device according to the present embodiment includes an allotted instantaneous total power input unit 1 that inputs the allocated instantaneous total power PT, a temperature rise start instructing unit 2 that instructs the start of temperature rise, and each control loop Li (i = 1 to n). , N is an integer equal to or greater than 2), the temperature rising power amount prediction unit 3 that predicts the temperature rising power amount PWi, which is the amount of electric power used by the heater required when the temperature is raised, for each control loop Li; A temperature increase execution order determination unit 4 that determines the order of increase in temperature increase power amount PWi of each control loop Li as the temperature increase execution order of each control loop Li, and at the start of the first temperature increase, or When it is determined that the control loop operation amount has decreased and the power margin has occurred due to the temperature increase of the control loop targeted for temperature increase, the temperature increase for selecting the control loop targeted for temperature increase according to the temperature increase execution order For the target selector 5 and the heater of each control loop Li A power limiting operation unit 6 that performs limit operation of the sheet to the power control loop Li (i = 1~n, n is an integer of 2 or more) composed of a control unit 7-i which is provided for each.

  The control unit 7-i includes a set value input unit 8-i, a control amount input unit 9-i, a PID control calculation unit 10-i, an operation amount upper limit processing unit 11-i, and an operation amount output unit 12-. i. In this embodiment, the control device is applied to the heating device shown in FIG. 6 and will be described using the reference numerals in FIG. In this case, the controller 101-i shown in FIG. 6 becomes the control unit 7-i.

  FIG. 2 is a flowchart for explaining the operation of the control device, and FIGS. 3A to 3F are diagrams showing an operation example of the control device. In the present embodiment, a case of three loops having the same temperature rising capability will be described. 3A, 3C, and 3E are diagrams showing changes in the control amounts PV1, PV2, and PV3 of the control loops L1, L2, and L3, respectively, FIG. 3B and FIG. 3D. FIG. 3F is a diagram showing changes in the manipulated variables MV1, MV2, and MV3 of the control loops L1, L2, and L3, respectively.

  Here, the outline of the effect will be described. In the case of the prior art disclosed in Patent Documents 1 to 4, if the temperature of each control loop is accidentally increased in the order of increasing temperature rise PW, the order of temperature increase is Due to thermal interference from the second control loop, an overshoot of the controlled variable occurs in the control loop with the first temperature increase order, and it becomes difficult to eliminate this overshoot state. If an excessive overshoot occurs, if the operation is performed to start the temperature increase of the third control loop in the temperature increase order after waiting for the cancellation of the overshoot state, the temperature increase order is the first. The control loop having the third temperature increase order waits for a long time until the temperature increase starts.

  On the other hand, when the temperature of each control loop is increased in the order of increasing heating power amount PW (that is, in the order of increasing operation amount MVi) as in the present embodiment, the thermal interference from the second control loop in the rising temperature order. It is possible to relatively easily eliminate the overshoot state in the control loop with the first temperature increase order. In addition, it is possible to relatively easily eliminate the overshoot state in the first and second control loops that are generated due to thermal interference from the third control loop. Therefore, in this embodiment, it is possible to reduce the standby time until the temperature rise starts and the overshoot of the control amount.

  Hereinafter, the operation of the control device will be specifically described. In the present embodiment, there are three control loops L1 to L3 as preconditions, and the instantaneous power consumption of the heaters 103-1 to 103-3 of each control loop L1 to L3 is linearly related to the operation amounts MV1 to MV3, respectively. Assuming proportionality, each condition is further assumed as follows.

First, the heater capacity coefficients HP1 to HP3 representing the heating capacity of the heaters 103-1 to 103-3 of the control loops L1 to L3 are set to HP1 = 400W, HP2 = 400W, and HP = 400W. Here, the heater capacity is used as the heater capacity coefficients HP1 to HP3.
Next, the temperature increase time coefficients TH1 to TH3 representing the time required to heat the control zones Z1 to Z3 of the control loops L1 to L3 at unit temperature are set to TH1 = 10 sec. / ° C., TH2 = 10 sec. / ° C., TH3 = 10 sec. / ° C.

Further, the temperature set values SP1 to SP3 after the start of temperature increase in each control loop L1 to L3 are set to SP1 = 200 ° C., SP2 = 200 ° C., SP3 = 200 ° C., and the control amounts PV1 to PV3 (temperature) before the temperature increase is started. ) PV1 = 100 ° C., PV2 = 100 ° C., PV3 = 100 ° C.
Further, the initial values of the operation amount upper limit values OH1 to OH3 of the control loops L1 to L3 are set to OH1 = 100%, OH2 = 100%, OH3 = 100%, and the operation amounts MV1 to MV3 before the start of temperature increase are set to MV1. = 30%, MV2 = 10%, MV3 = 40%.

  Further, the maximum instantaneous total power PM is set to PM = 1200 W (= HP1 + HP2 + HP3), and the allocated instantaneous total power PT input to the allocated instantaneous total power input unit 1 is PT = 720 W (60% of the maximum instantaneous total power PM). To do.

  As described above, the control loops L1 to L3 have almost the same conditions, but the reason why the operation amount before the start of temperature rise is different is that the amount of heat radiation is different due to the difference in the arrangement of the control zones Z1 to Z3 to be heated. Because there is. In the control zone where the amount of heat radiation is large, the instantaneous power (or operation amount) necessary for maintaining a constant temperature is high. At the same time, since the heat dissipation characteristic is also high, a large amount of heat dissipation means that there is a cooling ability.

  The temperature set value SPi of each control loop Li (i = 1 to 3) is set by the operator of the control device and is input to the PID control calculation unit 10-i via the set value input unit 8-i (FIG. 2). Step S100). Further, the temperature set value SPi is input to the temperature rising power amount prediction unit 3 and the temperature rising target selection unit 5 via the set value input unit 8-i.

  The control amount PVi (temperature) of each control loop Li is measured by a temperature sensor (temperature sensor 102-i in the example of FIG. 6) provided for each control loop Li, and PID is transmitted via the control amount input unit 9-i. The data is input to the control calculation unit 10-i (step S101). Further, the control amount PVi is input to the temperature increase power amount prediction unit 3 and the temperature increase target selection unit 5 via the control amount input unit 9-i.

When the temperature increase start instruction unit 2 inputs a temperature increase start instruction signal in response to an instruction from the operator, for example (YES in step S102), the temperature increase power amount prediction unit 3 increases the power increase amount of each control loop L1 to L3. PW1 to PW3 are calculated as follows (step S103).
PW1 = (SP1-PV1) HP1TH1 {OH1 / (OH1-MV1)}
= (200-100) 400 × 10 {100 / (100-30)} = 571429
... (1)
PW2 = (SP2-PV2) HP2TH2 {OH2 / (OH2-MV2)}
= (200-100) 400 × 10 {100 / (100-10)} = 444444
... (2)
PW3 = (SP3-PV3) HP3TH3 {OH3 / (OH3-MV3)}
= (200-100) 400 × 10 {100 / (100-40)} = 666667
... (3)

When formulas (1) to (3) are generalized, the following formula is obtained.
PWi = (SPi−PVi) HPiTHi {OHi / (OHi−MVi)}
... (4)

  Since the calculation principle of the heating power amounts PW1 to PW3 according to the equations (1) to (4) is disclosed in Japanese Patent No. 4468868, detailed description thereof is omitted. The temperature rise start instructing unit 2 is not an instruction from the operator, but when the temperature set value SPi acquired from each set value input unit 8-i is simultaneously changed in the same direction (herein, the temperature rise direction), A temperature start instruction signal may be generated.

  The temperature increase execution order determination unit 4 determines the order of increasing the power increase amounts PW1 to PW3 of the control loops L1 to L3 from the larger one to the smaller as the temperature increase execution order of the control loops L1 to L3 (step S104). ). According to the formulas (1) to (3), the predicted results of the heating power amounts PW1 to PW3 are in the order of PW3> PW1> PW2, and therefore, the heating execution order of the control loops L1 to L3 is L3 → L1 → L2. It becomes the order of. Note that the processes in steps S103 to S104 need only be performed once at the start of temperature increase.

  Next, the temperature increase target selection unit 5 determines whether or not the control loop temperature increase start condition is satisfied (step S105), and when the control loop temperature increase start condition is satisfied, the temperature increase execution order determination unit The control loop Li to be heated is selected according to the heating execution order determined by 4 (step S106). The control loop temperature rise start condition is satisfied at the time of the first temperature rise start or when the temperature rise of the control loop Li targeted for temperature rise advances, the manipulated variable MVi of this control loop Li decreases and the power This is when it is determined that there is a margin. Specifically, when the control amount PVi of the control loop Li targeted for temperature increase reaches the temperature set value SPi, it is determined that the operation amount MVi of the control loop Li decreases and a power margin is generated. Here, since it is time to start the first temperature increase, the temperature increase target selection unit 5 determines that the control loop temperature increase start condition is satisfied and follows the first temperature increase target control loop according to the temperature increase execution order. L3 is selected (step S106).

  Then, the power limiting operation unit 6 determines that the sum of the power supplied to the heaters 103-1 to 103-3 in each control loop L1 to L3 is within the allocated instantaneous total power PT and the heater in the control loop L3 to be heated The operation of limiting the power supplied to each of the control loops L1 to L3 is performed so that power is preferentially supplied to 103-3 (step S107). Specifically, the power limiting operation unit 6 sets the operation amount upper limit value OH3 of the control unit 7-3 constituting the control loop L3 for the first temperature increase selected by the temperature increase target selection unit 5 to the maximum value 100. Set to%. In addition, the power limiting operation unit 6 sets the operation amount upper limit value OH1 of the control unit 7-1 constituting the control loop L1 that is not subject to temperature increase to the operation amount MV1 before starting temperature increase = 30%. The operation amount upper limit value OH2 of the control unit 7-2 configuring the control loop L2 that is not the target is set to the operation amount MV2 before starting temperature increase = 10%.

At this time, the instantaneous power consumption PS of the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is estimated as follows, and is within the allocated instantaneous total power PT = 720W. Note that, in the assumption of the present embodiment, the estimated value and the actual value of the instantaneous power consumption PS coincide with each other.
PS = (HP1MV1 / 100) + (HP2MV2 / 100)
+ (HP3MV3 / 100)
= (400 x 30/100) + (400 x 10/100)
+ (400 x 100/100)
= 120 + 40 + 400 = 560W (5)

  The instantaneous power consumption PS is 560 W with respect to the allocated instantaneous total power PT = 720 W, and a margin of 160 W is generated. The power limiting operation unit 6 may turn this margin to increase the operation amount upper limit value OH1 of the control loop L1 that is predicted to have the largest heating power amount next to the control loop L3. In the present embodiment, even if there is a margin of power, the margin is still generated, and first, an operation for completing the temperature increase of the control loop L3 is performed.

When the instantaneous power consumption PS is estimated to exceed the allocated total instantaneous power PT = 720 W, the power limiting operation unit 6 sets the operation amount upper limit value OH3 of the control unit 7-3 constituting the control loop L3 to be heated. What is necessary is just to reduce suitably. As a method for lowering the operation amount upper limit value OH3, the setting is made such that the instantaneous power consumption PS does not exceed the allocated instantaneous total power PT = 720 W while the operation amount upper limit value OH3 is decreased by 5% from the maximum value 100%. Alternatively, the operation amount upper limit value OH3 may be directly calculated by the following mathematical formula. When Expression (6) is used, the right side of the inequality sign is the manipulated variable upper limit value OH3.
MV3 ≦ 100 {PS− (HP1MV1 / 100) − (HP2MV2 / 100)}
/ HP3
= 100 {720- (400 × 30/100) − (400 × 10/100)}
/ 400 = 140% (6)

  However, equation (6) can be used when the calculation result is smaller than 100%, and when the calculation result is 140% as in the example of equation (6), this value is used as the manipulated variable upper limit value OH3. Cannot be used.

  Next, the PID control calculation unit 10-i of the control unit 7-i is based on the temperature set value SPi input from the set value input unit 8-i and the control amount PVi input from the control amount input unit 9-i. Then, the manipulated variable MVi is calculated by a known PID control calculation (step S108).

The operation amount upper limit processing unit 11-i performs an upper limit process of the operation amount MVi as in the following equation (step S109).
IF MVi> OHi THEN MVi = OHi (7)
That is, when the operation amount MVi is larger than the operation amount output upper limit value OHi, the operation amount upper limit processing unit 11-i performs an upper limit process for setting the operation amount MVi = OHi.

The operation amount output unit 12-i outputs the operation amount MVi subjected to the upper limit processing by the operation amount upper limit processing unit 11-i to the control target (the actual output destination is the heater 103-i in the example of FIG. 6) (step S110). ). Since the control unit 7-i is provided corresponding to the control loop Li, the processes in steps S108 to S110 are performed for each control unit 7-i.
The control device performs the processes in steps S100 to S110 as described above at regular intervals until the control is terminated by, for example, an operator instruction (YES in step S111).

  Thus, when the temperature set values SP1 to SP3 are simultaneously changed as shown in FIGS. 3 (A), 3 (C), and 3 (E), as shown in FIGS. 3 (E) and 3 (F). Since the operation amount upper limit value OH3 of the control loop L3 is set to the maximum value 100%, the temperature rise is started in the control loop L3, and the control amount PV3 starts to rise. On the other hand, as shown in FIGS. 3B and 3D, the operation amount upper limit value OH1 of the control loop L1 is set to 30%, and the operation amount upper limit value OH2 of the control loop L2 is set to 10%. When the temperature rise is started in the control loop L3, the control amounts PV1 and PV2 of the control loops L1 and L2 do not change and are maintained at 100 ° C.

  When the control amount PV3 of the control loop L3 substantially reaches the temperature set value SP3 = 200 ° C., the operation amount MV3 calculated by the PID control calculation unit 10-3 is slightly higher than the operation amount 40% before the start of temperature increase. (For example, 45%). When the control amount PV3 of the control loop L3 is in an overshoot state due to thermal interference from the subsequent control loops L1 and L2, the operation amount MV3 is secured as an overshoot elimination capability by about 45%. It means that. That is, it means that the control loop L3 in which the overshoot elimination capability is most secured among the control loops L1 to L3 has a high probability of being appropriately selected as the first control loop for temperature increase.

  Due to thermal interference from the control loop L1, an overshoot state as indicated by 30 in FIG. 3E occurs in the control amount PV3 of the control loop L3. At this time, it can be seen that the overshoot is eliminated by decreasing the operation amount MV3 as indicated by 31 in FIG. Similarly, due to thermal interference from the control loops L1 and L2, an overshoot state as indicated by 32 in FIG. 3E occurs in the control amount PV3 of the control loop L3. At this time, it is understood that the overshoot is eliminated by decreasing the operation amount MV3 as indicated by 33 in FIG.

  Next, when the control amount PV3 of the control loop L3 reaches the temperature set value SP3 = 200 ° C., the temperature increase target selection unit 5 determines that the operation amount MV3 of the control loop L3 that is the temperature increase decreases and a power margin occurs. Judgment is made and it is determined that the control loop temperature rise start condition is satisfied (YES in step S105). Then, the temperature increase target selection unit 5 selects the second temperature increase target control loop L1 in accordance with the temperature increase execution order (step S106).

  The power limiting operation unit 6 is configured such that the sum of the power supplied to the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is within the allocated instantaneous total power PT and the heater 103- in the control loop L1 to be heated. The power to be supplied to each of the control loops L1 to L3 is limited so that power is preferentially supplied to 1 (step S107). Specifically, the power limiting operation unit 6 sets the operation amount upper limit value OH1 of the control unit 7-1 constituting the control loop L1 of the second temperature increase target selected by the temperature increase target selection unit 5 to the maximum value 100. Set to%. Further, the power limiting operation unit 6 keeps the operation amount upper limit value OH2 of the control unit 7-2 constituting the control loop L2 that is not subject to temperature increase set to the operation amount MV2 before starting temperature increase = 10%. In addition, the power limiting operation unit 6 keeps the operation amount upper limit value OH3 set to the maximum value of 100% because the temperature rise is completed and there is no need to limit the power for the control loop L3.

At this time, the instantaneous power consumption PS of the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is estimated as follows, and is within the allocated instantaneous total power PT = 720W.
PS = (HP1MV1 / 100) + (HP2MV2 / 100)
+ (HP3MV3 / 100)
= (400 x 100/100) + (400 x 10/100)
+ (400 x 45/100)
= 400 + 40 + 180 = 620W (8)

  The instantaneous power consumption PS is 620 W with respect to the allocated instantaneous total power PT = 720 W, and a margin of 100 W is generated. The power limiting operation unit 6 may use this margin for increasing the operation amount upper limit value OH2 of the remaining control loop L2. In the present embodiment, even if there is a margin of power, the margin remains, and first, an operation for completing the temperature rise of the control loop L1 is performed.

When the instantaneous power consumption PS is estimated to exceed the allocated instantaneous total power PT = 720 W, the power limiting operation unit 6 sets the operation amount upper limit value OH1 of the control unit 7-1 constituting the control loop L1 to be heated. What is necessary is just to reduce suitably. As a method for lowering the operation amount upper limit value OH1, the operation amount upper limit value OH1 is decreased by 5% from the maximum value 100% while repeatedly searching for a setting where the instantaneous power consumption PS does not exceed the allocated instantaneous total power PT = 720W. Alternatively, the operation amount upper limit value OH1 may be directly calculated by the following mathematical formula. When Expression (9) is used, the right side of the inequality sign is the manipulated variable upper limit value OH1.
MV1 ≦ 100 {PS− (HP2MV2 / 100) − (HP3MV3 / 100)}
/ HP1
= 100 {720- (400 × 10/100) − (400 × 45/100)}
/ 400 = 125% (9)

  However, the equation (9) can be used when the calculation result is smaller than 100%. When the calculation result is 125% as in the example of the equation (9), this value is set as the operation amount upper limit value OH1. Cannot be used.

  The processing of steps S108 to S110 is as described above. Thus, when the control amount PV3 of the control loop L3 reaches the temperature set value SP3 = 200 ° C., as shown in FIGS. 3A and 3B, the operation amount upper limit value OH1 of the control loop L1 is 100% maximum. Therefore, the temperature rise is started in the control loop L1, and the control amount PV1 starts to rise. On the other hand, as shown in FIG. 3 (D), the operation amount upper limit value OH2 of the control loop L2 remains set at 10%, so that the control amount of the control loop L2 is reached when the temperature rise is started in the control loop L1. PV2 remains unchanged and remains at 100 ° C.

  When the control amount PV1 of the control loop L1 substantially reaches the temperature set value SP1 = 200 ° C., the operation amount MV1 calculated by the PID control calculation unit 10-1 is a value slightly higher than the operation amount 30% before the start of temperature increase. (For example, 40%). This manipulated variable MV1 means that when the control loop L1 is in an overshoot state due to thermal interference from the subsequent control loop L2, a reduction amount of about 40% is secured as the overshoot elimination capability. That is, it means that there is a high probability that, among the control loops L1 and L2, the control loop L1 in which the overshoot elimination capability is ensured is appropriately selected as the second temperature increase target control loop.

  Due to thermal interference from the control loop L2, an overshoot state as indicated by 34 in FIG. 3A occurs in the control amount PV1 of the control loop L1. At this time, it is understood that the overshoot is eliminated by decreasing the operation amount MV1 as indicated by 35 in FIG.

  Next, when the control amount PV1 of the control loop L1 reaches the temperature setting value SP1 = 200 ° C., the temperature increase target selection unit 5 determines that the operation amount MV1 of the control loop L1 that is the temperature increase decreases and a power margin occurs. Judgment is made and it is determined that the control loop temperature rise start condition is satisfied (YES in step S105). The temperature increase target selection unit 5 selects the third temperature increase target control loop L2 in accordance with the temperature increase execution order (step S106).

  The power limiting operation unit 6 is configured such that the sum of the power supplied to the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is within the allocated instantaneous total power PT, and the heater 103- The power to be supplied to the control loops L1 to L3 is limited so that power is preferentially supplied to 2 (step S107). Specifically, the power limiting operation unit 6 sets the operation amount upper limit value OH2 of the control unit 7-2 constituting the control loop L2 of the third temperature increase target selected by the temperature increase target selection unit 5 to the maximum value 100. Set to%. In addition, the power limiting operation unit 6 does not need to limit the electric power for the control loops L1 and L3, and thus the operation amount upper limit values OH1 and OH3 are set to the maximum value of 100%. And

At this time, the instantaneous power consumption PS of the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is estimated as follows, and is within the allocated instantaneous total power PT = 720W.
PS = (HP1MV1 / 100) + (HP2MV2 / 100)
+ (HP3MV3 / 100)
= (400 × 40/100) + (400 × 100/100)
+ (400 x 45/100)
= 160 + 400 + 180 = 740W (10)

When the instantaneous power consumption PS is estimated to exceed the allocated instantaneous total power PT = 720 W, the power limiting operation unit 6 sets the operation amount upper limit value OH2 of the control unit 7-2 constituting the control loop L2 to be heated. What is necessary is just to reduce suitably. As a method for lowering the operation amount upper limit value OH2, the operation amount upper limit value OH2 is decreased by 5% from the maximum value 100% while repeatedly searching for a setting in which the instantaneous power consumption PS does not exceed the allocated instantaneous total power PT = 720W. Alternatively, the operation amount upper limit value OH2 may be directly calculated by the following mathematical formula. When Expression (11) is used, the right side of the inequality sign is the manipulated variable upper limit value OH2.
MV2 ≦ 100 {PS− (HP1MV1 / 100) − (HP3MV3 / 100)}
/ HP2
= 100 {720- (40040/100)-(40045/100)}
/ 400 = 95% (11)

  That is, the operation amount MV2 is calculated to be within 95%. The power limiting operation unit 6 can raise the temperature within the allocated instantaneous total power PT = 720 W by setting the operation amount upper limit value OH2 to 95%.

  The processing of steps S108 to S110 is as described above. Thus, when the control amount PV1 of the control loop L1 reaches the temperature set value SP1 = 200 ° C., the operation amount upper limit value OH2 of the control loop L2 is set to 95% as shown in FIGS. 3 (C) and 3 (D). Therefore, the temperature rise is started in the control loop L2, and the control amount PV2 starts to rise. Further, the power limiting operation unit 6 eliminates the need to limit the power when the control amount PV2 reaches the temperature set value SP2 = 200 ° C., so that the operation amount upper limit value OH2 is returned to the maximum value 100%.

  As described above, in the present embodiment, the order from the larger heating power amount PWi to the smaller heating power amount PWi is determined as the temperature increase execution order of each control loop Li, and the temperature increase target control is performed according to the temperature increase execution order. By performing the operation of limiting the power to be supplied while selecting the loop, it is possible to increase the probability that the overshoot of the control amount PVi can be suppressed.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the present embodiment, a description will be given of a case of three loops having greatly different temperature raising capabilities. Also in the present embodiment, the configuration of the control device and the flow of processing are the same as those in the first embodiment, and therefore description will be made using the reference numerals in FIGS. FIG. 4A to FIG. 4F are diagrams illustrating an operation example of the control device of the present embodiment. 4A, 4C, and 4E are diagrams showing changes in the control amounts PV1, PV2, and PV3 of the control loops L1, L2, and L3, respectively, FIG. 4B and FIG. 4D. FIG. 4F is a diagram showing changes in the operation amounts MV1, MV2, and MV3 of the control loops L1, L2, and L3, respectively.

  Here, the outline of the effect will be described. In the case of the prior art disclosed in Patent Documents 1 to 4, if the temperature of each control loop is accidentally increased in the order of increasing temperature rise PW, the order of temperature increase is Due to the thermal interference from the first control loop, the adjacent control loop is unlikely to increase in temperature. Therefore, in this case, the temperature increase in the second control loop in the temperature increase order can be started quickly. And since the control loop with the 3rd temperature increase order has large temperature increase electric power PW, the temperature of the adjacent control loop rises even temporarily due to thermal interference. Since the adjacent control loop has already completed the temperature increase, the temperature increase due to the thermal interference corresponds to a substantial overshoot state. When excessive overshoot occurs, it is normal to handle the completion of the temperature rise as the target by eliminating the overshoot state, so it takes a long time to complete the temperature rise of 3 loops. .

  On the other hand, when the temperature of each control loop is increased in the order of increasing heating power amount PW (that is, in the order of increasing thermal interference with the adjacent loop) as in the present embodiment, first, the heating loop is first in the order of increasing temperature. Due to the thermal interference from the adjacent control loop, the temperature rises even temporarily. The adjacent control loop has a low temperature before the temperature rise, and the probability of a temperature rise exceeding the target temperature due to this thermal interference is very low, so the temperature rise of the second control loop in the order of temperature rise can be started quickly. . And since the control loop with the 3rd temperature rising order has small temperature rising power amount PW, the thermal interference with the adjacent control loop is also small. Although the adjacent control loop has already completed the temperature increase, the temperature rise due to this heat interference is small and does not cause an excessive overshoot state. That is, it does not take a long time to complete the temperature increase of the three loops.

  Hereinafter, the operation of the control device will be specifically described. In the present embodiment, there are three control loops L1 to L3 as preconditions, and the instantaneous power consumption of the heaters 103-1 to 103-3 of each control loop L1 to L3 is linearly related to the operation amounts MV1 to MV3, respectively. Assuming proportionality, each condition is further assumed as follows.

First, the heater capacity coefficients HP1 to HP3 representing the heating capacities of the heaters 103-1 to 103-3 of the control loops L1 to L3 are set to HP1 = 200W, HP2 = 800W, and HP3 = 200W.
Next, the temperature increase time coefficients TH1 to TH3 representing the time required to heat the control zones Z1 to Z3 of the control loops L1 to L3 at unit temperature are set to TH1 = 10 sec. / ° C., TH2 = 10 sec. / ° C., TH3 = 10 sec. / ° C.

Further, the temperature set values SP1 to SP3 after the start of temperature increase in each control loop L1 to L3 are set to SP1 = 200 ° C., SP2 = 200 ° C., SP3 = 200 ° C., and the control amounts PV1 to PV3 (temperature) before the temperature increase is started. ) PV1 = 100 ° C., PV2 = 100 ° C., PV3 = 100 ° C.
Further, the initial values of the operation amount upper limit values OH1 to OH3 of the control loops L1 to L3 are set to OH1 = 100%, OH2 = 100%, OH3 = 100%, and the operation amounts MV1 to MV3 before the start of temperature increase are set to MV1. = 10%, MV2 = 10%, MV3 = 10%.

Further, the maximum instantaneous total power PM is set to PM = 1200 W (= HP1 + HP2 + HP3), and the allocated instantaneous total power PT input to the allocated instantaneous total power input unit 1 is PT = 720 W (60% of the maximum instantaneous total power PM). To do.
Thus, in the present embodiment, only the heater capacity coefficients HP1 to HP3 are greatly different in the control loops L1 to L3. As the heater capacity coefficient HP is larger, the temperature increase effect due to thermal interference is greater as an influence on the adjacent loop.

The processes in steps S100 and S101 in FIG. 2 are the same as those in the first embodiment. When temperature setting values SP1 to SP3 are changed and temperature increase start instructing unit 2 inputs a temperature increase start instructing signal (YES in step S102 in FIG. 2), temperature rising power amount predicting unit 3 changes each of control loops L1 to L3. The heating power amounts PW1 to PW3 are calculated as follows (step S103).
PW1 = (SP1-PV1) HP1TH1 {OH1 / (OH1-MV1)}
= (200-100) 200 × 10 {100 / (100-10)} = 222222
(12)
PW2 = (SP2-PV2) HP2TH2 {OH2 / (OH2-MV2)}
= (200-100) 800 × 10 {100 / (100-10)} = 888889
(13)
PW3 = (SP3-PV3) HP3TH3 {OH3 / (OH3-MV3)}
= (200-100) 200 × 10 {100 / (100-10)} = 222222
(14)

  The temperature increase execution order determination unit 4 determines the order of increasing the power increase amounts PW1 to PW3 of the control loops L1 to L3 from the larger one to the smaller as the temperature increase execution order of the control loops L1 to L3 (step S104). ). According to the equations (12) to (14), the predicted results of the heating power amounts PW1 to PW3 are in the order of PW2> PW1 = PW3. It becomes the order of. It should be noted that since the heating power amounts PW1 and PW3 are equal, either of the control loops L1 and L3 may be heated first, but here the control loop L1 precedes the control loop L3 according to the numerical order of the control loop. I will let you.

  Next, the temperature increase target selection unit 5 determines whether or not the control loop temperature increase start condition is satisfied (step S105). Here, since it is time to start the first temperature increase, the temperature increase target selection unit 5 determines that the control loop temperature increase start condition is satisfied and follows the first temperature increase target control loop according to the temperature increase execution order. L2 is selected (step S106).

  The power limiting operation unit 6 is configured such that the sum of the power supplied to the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is within the allocated instantaneous total power PT, and the heater 103- The power to be supplied to the control loops L1 to L3 is limited so that power is preferentially supplied to 2 (step S107). Specifically, the power limiting operation unit 6 sets the operation amount upper limit value OH2 of the control unit 7-2 constituting the control loop L2 of the first temperature increase target selected by the temperature increase target selection unit 5 to the maximum value 100. Set to%. The power limiting operation unit 6 sets the operation amount upper limit value OH1 of the control unit 7-1 constituting the control loop L1 that is not subject to temperature increase to the operation amount MV1 before start of temperature increase MV1 = 10%. The operation amount upper limit value OH3 of the control unit 7-3 configuring the non-target control loop L3 is set to the operation amount MV3 before starting temperature increase = 10%.

At this time, the instantaneous power consumption PS of the heaters 103-1 to 103-3 in each control loop L1 to L3 is estimated as follows, and does not fall within the allocated instantaneous total power PT = 720W.
PS = (HP1MV1 / 100) + (HP2MV2 / 100)
+ (HP3MV3 / 100)
= (200 × 10/100) + (800 × 100/100)
+ (200 x 10/100)
= 20 + 800 + 20 = 840W (15)

When the instantaneous power consumption PS is estimated to exceed the allocated instantaneous total power PT = 720 W, the power limiting operation unit 6 can appropriately lower the operation amount upper limit value OH2 of the control unit 7-2 that constitutes the control loop L2 to be heated. That's fine. As a method for lowering the operation amount upper limit value OH2, the operation amount upper limit value OH2 is decreased by 5% from the maximum value 100% while repeatedly searching for a setting in which the instantaneous power consumption PS does not exceed the allocated instantaneous total power PT = 720W. Alternatively, the operation amount upper limit value OH2 may be directly calculated by the following mathematical formula. When Expression (16) is used, the right side of the inequality sign is the manipulated variable upper limit value OH2.
MV2 ≦ 100 {PS− (HP1MV1 / 100) − (HP3MV3 / 100)}
/ HP2
= 100 {720- (200 × 10/100) − (200 × 10/100)}
/ 800 = 85% (16)

  That is, the operation amount MV2 is calculated to be within 85%. The power limiting operation unit 6 can raise the temperature within the allocated instantaneous total power PT = 720 W by setting the operation amount upper limit value OH2 to 85%.

  The processing in steps S108 to S110 in FIG. 2 is the same as that in the first embodiment. Thus, when the temperature set values SP1 to SP3 are simultaneously changed as shown in FIGS. 4 (A), 4 (C), and 4 (E), as shown in FIGS. 4 (C) and 4 (D). Since the operation amount upper limit value OH2 of the control loop L2 is set to 85%, the temperature rise is started in the control loop L2, and the control amount PV2 starts to rise. On the other hand, as shown in FIGS. 4B and 4F, the operation amount upper limit values OH1 and OH3 of the control loops L1 and L3 are set to 10%, and therefore, when the temperature increase is started in the control loop L2. Then, the control amounts PV1 and PV3 of the control loops L1 and L3 do not change immediately. However, since there is thermal interference from the control loop L2, the control amounts PV1 and PV3 gradually increase.

When the control amount PV2 of the control loop L2 substantially reaches the temperature set value SP2 = 200 ° C., the operation amount MV2 calculated by the PID control calculation unit 10-2 is slightly higher than the operation amount 10% before the start of temperature increase. (For example, 15%).
During the temperature increase of the control loop L2, as described above, the control amounts PV1 and PV3 of the adjacent control loops L1 and L3 rise even temporarily due to the thermal interference from the control loop L2. The control loops L1 and L3 are at a low temperature before the temperature rise, and the probability that a temperature rise exceeding the temperature set values SP1 and SP3 will occur due to this thermal interference is extremely low, for example, the temperature rise is only about 100 ° C. to 120 ° C. Therefore, it is possible to quickly start raising the temperature of the next control loop L1.

  When the control amount PV2 of the control loop L2 reaches the temperature set value SP2 = 200 ° C., the temperature increase target selection unit 5 determines that the operation amount MV2 of the control loop L2 that is the temperature increase decreases and a power margin occurs. It is determined that the control loop temperature rise start condition is satisfied (YES in step S105). Then, the temperature increase target selection unit 5 selects the second temperature increase target control loop L1 in accordance with the temperature increase execution order (step S106).

  The power limiting operation unit 6 is configured such that the sum of the power supplied to the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is within the allocated instantaneous total power PT and the heater 103- in the control loop L1 to be heated. The power to be supplied to each of the control loops L1 to L3 is limited so that power is preferentially supplied to 1 (step S107). Specifically, the power limiting operation unit 6 sets the operation amount upper limit value OH1 of the control unit 7-1 constituting the control loop L1 of the second temperature increase target selected by the temperature increase target selection unit 5 to the maximum value 100. Set to%. Further, the power limiting operation unit 6 keeps the operation amount upper limit value OH3 of the control unit 7-3 constituting the control loop L3 that is not subject to temperature increase set to the operation amount MV3 before starting temperature increase = 10%. Further, the power limiting operation unit 6 returns the operation amount upper limit value OH2 from 85% to the maximum value of 100% because the temperature rise is completed and there is no need to limit the power for the control loop L2.

At this time, the instantaneous power consumption PS of the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is estimated as follows, and is within the allocated instantaneous total power PT = 720W.
PS = (HP1MV1 / 100) + (HP2MV2 / 100)
+ (HP3MV3 / 100)
= (200 x 100/100) + (800 x 15/100)
+ (200 x 10/100)
= 200 + 120 + 20 = 340W (17)

  The instantaneous power consumption PS is 340 W with respect to the allocated instantaneous total power PT = 720 W, and a margin of 380 W is generated. The power limiting operation unit 6 may use this margin to increase the operation amount upper limit value OH3 of the remaining control loop L3. In the present embodiment, even if there is a margin of power, the margin remains, and first, an operation for completing the temperature rise of the control loop L1 is performed.

  When the instantaneous power consumption PS is estimated to exceed the allocated instantaneous total power PT = 720 W, the power limiting operation unit 6 sets the operation amount upper limit value OH1 of the control unit 7-1 constituting the control loop L1 to be heated. What is necessary is just to reduce suitably. As a method for lowering the operation amount upper limit value OH1, the operation amount upper limit value OH1 is decreased by 5% from the maximum value 100% while repeatedly searching for a setting in which the instantaneous power consumption PS does not exceed the allocated instantaneous total power PT = 720W. Alternatively, the operation amount upper limit value OH1 may be directly calculated by the following mathematical formula. When Expression (18) is used, the right side of the inequality sign is the manipulated variable upper limit value OH1.

MV1 ≦ 100 {PS− (HP2MV2 / 100) − (HP3MV3 / 100)}
/ HP1
= 100 {720- (800 × 15/100) − (200 × 10/100)}
/ 200 = 290% (18)

  However, equation (18) can be used when the calculation result is smaller than 100%, and when the calculation result is 290% as in the example of equation (18), this value is set as the manipulated variable upper limit value OH1. Cannot be used.

  The processing of steps S108 to S110 is as described above. Thus, when the control amount PV2 of the control loop L2 reaches the temperature set value SP2 = 200 ° C., as shown in FIGS. 4A and 4B, the operation amount upper limit value OH1 of the control loop L1 is 100% maximum. Therefore, the temperature rise is started in the control loop L1, and the control amount PV1 greatly increases. On the other hand, as shown in FIG. 4 (F), the operation amount upper limit value OH3 of the control loop L3 remains set at 10%, and therefore, when the temperature rise is started in the control loop L1, the control amount of the control loop L3. PV3 does not change greatly and gradually rises due to thermal interference from the control loops L1 and L2.

When the control amount PV1 of the control loop L1 substantially reaches the temperature setting value SP1 = 200 ° C., the operation amount MV1 calculated by the PID control calculation unit 10-1 is a value slightly higher than the operation amount 10% before the start of temperature increase. (For example, 15%).
During the temperature increase of the control loop L1, the control amounts PV2 and PV3 of the adjacent control loops L2 and L3 rise even temporarily due to thermal interference from the control loop L1. However, the control loop L1 is a control loop with a low heater capacity coefficient, and the temperature rise due to thermal interference from the control loop L1, for example, the control amount PV2 of the control loop L2 rises from 200 ° C. to 205 ° C., and the control loop L3 Therefore, the control amount PV3 of the first control loop need only be relatively small, such as a temperature rise from 120 ° C. to 125 ° C., so that the next control loop L3 can be quickly heated up.

  When the control amount PV1 of the control loop L1 reaches the temperature set value SP1 = 200 ° C., the temperature increase target selection unit 5 determines that the operation amount MV1 of the control loop L1 that is the temperature increase decreases and a power margin occurs, It is determined that the control loop temperature rise start condition is satisfied (YES in step S105). Then, the temperature increase target selection unit 5 selects the third temperature increase target control loop L3 in accordance with the temperature increase execution order (step S106).

  The power limiting operation unit 6 is configured such that the sum of the power supplied to the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is within the allocated instantaneous total power PT, and the heater 103- The power to be supplied to each of the control loops L1 to L3 is limited so that power is preferentially supplied to 3 (step S107). Specifically, the power limiting operation unit 6 sets the operation amount upper limit value OH3 of the control unit 7-3 constituting the control loop L3 for the third temperature increase selected by the temperature increase target selection unit 5 to the maximum value 100. Set to%. In addition, the power limiting operation unit 6 does not need to limit the power for the control loops L1 and L2, so that the operation amount upper limit values OH1 and OH2 are set to the maximum value of 100%. And

At this time, the instantaneous power consumption PS of the heaters 103-1 to 103-3 in each of the control loops L1 to L3 is estimated as follows, and is within the allocated instantaneous total power PT = 720W.
PS = (HP1MV1 / 100) + (HP2MV2 / 100)
+ (HP3MV3 / 100)
= (200 × 15/100) + (800 × 15/100)
+ (200 x 100/100)
= 30 + 120 + 200 = 350W (19)

  The processing of steps S108 to S110 is as described above. Thus, when the control amount PV1 of the control loop L1 reaches the temperature set value SP1 = 200 ° C., as shown in FIGS. 4E and 4F, the operation amount upper limit value OH3 of the control loop L3 is 100% maximum. Therefore, the temperature rise is started in the control loop L3, and the control amount PV3 increases greatly.

  During the temperature rise of the control loop L3, the control amounts PV1 and PV2 of the adjacent control loops L1 and L2 rise even temporarily due to thermal interference from the control loop L3. However, the control loop L3 is a control loop with a low heater capacity coefficient, and the temperature rise due to thermal interference from the control loop L3, for example, the control amounts PV1 and PV2 of the control loops L1 and L2 rise from 200 ° C. to 205 ° C. And so on.

  As described above, even when the temperature raising capabilities of the plurality of control loops Li are greatly different, the same effect as that of the first embodiment can be obtained.

[Third Embodiment]
In the first and second embodiments, the temperature increase execution order is determined based on the temperature increase power amount PWi. However, the order is not limited to this. For example, the temperature increase execution amount PWi such as the fuel usage amount is used. Thus, the order of temperature increase execution may be determined. That is, the present invention includes a form in which the physical quantity “power” used in the first and second embodiments is replaced with “energy”.

FIG. 5 shows the configuration of a control device in which the physical quantity “power” used in the control devices of the first and second embodiments is replaced with “energy”.
The control device in FIG. 5 includes an allotted instantaneous total energy input unit 1a, a temperature increase start instruction unit 2a, a temperature increase energy amount prediction unit 3a, a temperature increase execution order determination unit 4a, a temperature increase target selection unit 5a, The energy limiting operation unit 6a and a control unit 7-i provided for each control loop Li are configured. Since the configuration of the control device corresponds to that obtained by replacing “electric power” with “energy” in the first and second embodiments, a detailed description thereof will be omitted.

  The control devices of the first to third embodiments include a control unit 7-i and other devices (allocation instantaneous total power input unit 1, allocation instantaneous total energy input unit 1a, temperature increase start instruction units 2, 2a, The temperature increase power amount prediction unit 3, the temperature increase energy amount prediction unit 3a, the temperature increase execution order determination units 4 and 4a, the temperature increase target selection units 5 and 5a, the power limit operation unit 6, and the energy limit operation unit 6a) are divided. Each device can be realized by a computer having a CPU, a storage device, and an interface, and a program for controlling these hardware resources. The CPU of each device executes the processing described in the first to third embodiments in accordance with a program stored in the storage device.

  The present invention can be applied to a multi-loop control system having a plurality of control loops.

  DESCRIPTION OF SYMBOLS 1 ... Allocation instantaneous total electric power input part, 1a ... Allocation instantaneous total energy input part, 2, 2a ... Temperature rising start instruction | indication part, 3 ... Temperature rising electric energy prediction part, 3a ... Temperature rising energy amount prediction part, 4, 4a ... Temperature increase execution order determination unit, 5, 5a ... Temperature increase target selection unit, 6 ... Power limit operation unit, 6a ... Energy limit operation unit, 7-i ... Control unit, 8-i ... Set value input unit, 9-i ... control amount input unit, 10-i ... PID control calculation unit, 11-i ... operation amount upper limit processing unit, 12-i ... operation amount output unit.

Claims (12)

A temperature rise energy amount predicting means for predicting, for each control loop Li, a temperature rise energy amount PWi that is an energy consumption amount of a heater required when raising the temperature of the control zone of each control loop Li (i = 1 to n). When,
A temperature increase execution order determining means for determining the order of increase in the temperature increase energy amount PWi of each control loop Li from the larger one to the smaller as the temperature increase execution order of each control loop Li;
When the first temperature rise starts or when it is determined that the amount of operation of the control loop has decreased due to the temperature rise in the control loop targeted for temperature rise and an energy margin has been generated, A temperature increase target selection means for selecting a control loop for the temperature target;
The total energy supplied to the heaters of each control loop Li is within a predetermined allocated instantaneous total energy PT, and the energy of each control loop Li is preferentially supplied to the heater of the control loop to be heated. Energy limiting operation means for limiting the energy supplied to the heater;
Provided for each control loop Li, calculate the manipulated variable MVi by control calculation with the temperature set value SPi and the temperature PVi as inputs, and execute an upper limit process for limiting the manipulated variable MVi according to the setting of the energy limiting operation means, And a control means for outputting the manipulated variable MVi to the heater of the corresponding control loop Li. The control device according to claim 1,
The control device according to claim 1, wherein the energy limiting operation means performs a limiting operation of energy supplied to the heater of each control loop Li by changing an operation amount upper limit value OHi of the control means of each control loop Li. The control device according to claim 2, wherein
When the temperature of the control loop targeted for temperature rise reaches the temperature set value, the temperature increase target selection means determines that the operation amount has decreased due to the temperature rise of the control loop targeted for temperature rise, resulting in an energy margin. A control device characterized by determining. Temperature rising power amount predicting means for predicting, for each control loop Li, a temperature rising power amount PWi, which is a power consumption amount of the heater required when the temperature of the control zone of each control loop Li (i = 1 to n) is raised. When,
A temperature increase execution order determination means for determining an order from a larger one to a smaller temperature increase electric power amount PWi of each control loop Li as a temperature increase execution order of each control loop Li;
When the first temperature rise starts or when it is determined that the control loop operation amount has decreased due to the temperature rise in the control loop targeted for temperature rise and a power margin has occurred, the temperature rise is performed according to the temperature rise execution sequence. A temperature increase target selection means for selecting a control loop for the temperature target;
The total power supplied to the heaters of each control loop Li is within a predetermined allocated instantaneous total power PT, and the power of each control loop Li is preferentially supplied to the heater of the control loop to be heated. Power limiting operation means for performing a limiting operation of power supplied to the heater;
Provided for each control loop Li, the operation amount MVi is calculated by control calculation with the temperature set value SPi and the temperature PVi as inputs, and an upper limit process for limiting the operation amount MVi in accordance with the setting of the power limiting operation means is executed. And a control means for outputting the manipulated variable MVi to the heater of the corresponding control loop Li. The control device according to claim 4, wherein
The control apparatus according to claim 1, wherein the power limiting operation unit performs a limiting operation of power supplied to the heater of each control loop Li by changing an operation amount upper limit value OHi of the control unit of each control loop Li. The control device according to claim 5,
When the temperature of the control loop targeted for temperature rise reaches the temperature set value, the temperature rise target selection means determines that the operation amount has decreased due to the temperature rise of the control loop targeted for temperature rise, resulting in a power margin. A control device characterized by determining. A step-up energy amount prediction step for predicting, for each control loop Li, a heat-up energy amount PWi, which is an energy usage amount of a heater required when the control zone of each control loop Li (i = 1 to n) is heated. When,
A temperature increase execution order determination step for determining the order of increase in the temperature increase energy amount PWi of each control loop Li from the larger one to the smaller as the temperature increase execution order of each control loop Li;
When the first temperature rise starts or when it is determined that the amount of operation of the control loop has decreased due to the temperature rise in the control loop targeted for temperature rise and an energy margin has been generated, A temperature increase target selection step for selecting a control loop for the temperature target;
The total energy supplied to the heaters of each control loop Li is within a predetermined allocated instantaneous total energy PT, and the energy of each control loop Li is preferentially supplied to the heater of the control loop to be heated. An energy limiting operation step for limiting the energy supplied to the heater;
The operation amount MVi is calculated by control calculation with the temperature set value SPi and the temperature PVi as inputs, and an upper limit process for limiting the operation amount MVi according to the setting of the energy limiting operation step is executed, and the operation amount MVi after the upper limit process is handled. And a control step of outputting to the heater of the control loop Li. The control method according to claim 7,
The control method characterized in that the energy limiting operation step performs a limiting operation of energy supplied to the heater of each control loop Li by changing an operation amount upper limit value OHi of the control step for each control loop Li. The control method according to claim 8, wherein
In the temperature increase target selection step, when the temperature of the control loop targeted for temperature increase reaches the temperature set value, the operation amount is decreased due to the temperature increase of the control loop targeted for temperature increase, resulting in an energy margin. A control method characterized by judging. A step-up power amount prediction step for predicting, for each control loop Li, a step-up power amount PWi, which is a power consumption amount of the heater required when the control zone of each control loop Li (i = 1 to n) is raised. When,
A temperature increase execution order determination step for determining the order of increase in the temperature increase power amount PWi of each control loop Li from the larger one to the smaller as the temperature increase execution order of each control loop Li;
When the first temperature rise starts or when it is determined that the control loop operation amount has decreased due to the temperature rise in the control loop targeted for temperature rise and a power margin has occurred, the temperature rise is performed according to the temperature rise execution sequence. A temperature increase target selection step for selecting a control loop for the temperature target;
The total power supplied to the heaters of each control loop Li is within a predetermined allocated instantaneous total power PT, and the power of each control loop Li is preferentially supplied to the heater of the control loop to be heated. A power limiting operation step for limiting the power supplied to the heater;
The operation amount MVi is calculated by control calculation with the temperature set value SPi and the temperature PVi as inputs, and an upper limit process for limiting the operation amount MVi according to the setting of the power limiting operation step is executed, and the operation amount MVi after the upper limit process is handled. And a control step of outputting to the heater of the control loop Li. The control method according to claim 10, wherein
In the control method, the power limiting operation step performs a limiting operation of power supplied to the heater of each control loop Li by changing an operation amount upper limit value OHi of the control step for each control loop Li. The control method according to claim 11, wherein
In the temperature increase target selection step, when the temperature of the control loop targeted for temperature increase reaches the temperature set value, the operation amount decreases and a power margin is generated as the temperature increase of the control loop targeted for temperature increase proceeds. A control method characterized by judging.