JP2000054033A - Method for distributing load, device therefor and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the development of error in the total manipulated variables by suitably distributing fuel flow rate in each zone regardless of the upper and the lower limited values of the fuel flow rate in each zone. SOLUTION: In a distributing device for fuel flow rate, a distributing quantity operating part 7, in which the manipulated variable to be distributed in each manipulating end is calculated in order according to a prescribed distributing ratio based on a distributing objective manipulated variable excluding the already decided manipulated variable from the decided total manipulated variables and a limitor 9, in which the manipulated variable at the manipulating end is set to either one of the upper or lower limited value, in the case of exceeding the range of the upper and lower limited values at the manipulating end in the calculated manipulated variable are provided. For example, in the case that the calculated manipulated variable exceeds the upper limited value, the manipulated variable is clamped to the upper limited value and the remaining manipulated variable excluding this set manipulated variable from the total manipulated variables is distributed with the remaining manipulating end and thus, while regulating the set manipulated variable to each manipulating end to in the range of the upper and the lower limited values, the development of the error in the total manipulated variables distributing the load, is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load distribution method and apparatus, and more particularly to a technique for distributing a determined total operation amount to a plurality of operation terminals and controlling each operation amount. . For example, the present invention is suitable for use in a technique for controlling the plate temperature at the furnace outlet by distributing the load of the fuel flow rate to a heating furnace, a cooling furnace, and the like constituting a continuous annealing line for steelmaking.

[0002]

2. Description of the Related Art Generally, a continuous annealing furnace in a steel sheet (strip) production line is provided with a heating zone for heating a cold-rolled steel sheet and an equalizing temperature for maintaining the steel sheet coming out of the heating zone at a predetermined temperature. Various zones, such as a tropical zone and then a cooling zone for cooling the steel sheet, are juxtaposed along the transport path of the steel sheet. In such a continuous annealing furnace, an operation is performed in which each end of the strip is welded to form a continuous strip, and the strip is continuously passed through the heating furnace.

[0003] That is, in order to enable continuous annealing, each strip sent to the heating furnace is welded to the end of the strip being passed upstream of the heating furnace and the tip of the strip to be passed next is sequentially welded. Is done. Thus, the strip is always continuously passed through the heating furnace. in this case,
Depending on the required product type, the same strip may be welded, or different strips having different thicknesses, widths, materials or sheet temperature standards (target values) may be welded.

[0004] Usually, the heating furnace is divided into a plurality of zones, and the strip is heated by radiant heat from a heater (for example, a radiant tube) provided for each zone. The control of the sheet temperature at the furnace outlet of the strip heated by these is generally performed by directly or indirectly changing the set value of the fuel flow rate in the heating furnace as the manipulated variable. In this case, the fuel flow rate to each radiant tube is adjusted by a fuel flow rate controller provided for each zone, and the strip is controlled so as to have a target temperature as a whole.

Conventionally, in order to keep the strip at a target temperature at the heating furnace outlet, for example, Japanese Patent Application Laid-Open No.
In the technology disclosed in Japanese Patent Publication No. 35531 and Japanese Patent Publication No. 63-34210, a required fuel flow rate is determined for the entire heating furnace, and the entire flow rate is distributed to the radiant tubes in each zone at an appropriate ratio. I was This ratio is set, for example, in a uniform load pattern in which the entire zone is distributed at a uniform flow rate, or in a later zone high load pattern in which the zone is distributed so that the flow rate increases in a zone closer to the furnace outlet.

[0006]

However, in the actual continuous annealing furnace, the fuel flow rate that can be supplied to the radiant tube in each zone is limited to the upper and lower limits due to the performance or safety of the radiant tube. Exists. In this case, if the calculated total fuel flow is distributed to each zone according to a predetermined pattern,
In some cases, the allocated flow rate exceeds the upper and lower limits of the zone. In this case, the fuel flow rate for each zone is suppressed at the upper and lower limit values, and the excess is cut off.

For example, there are four annealing zones No. 1 to No. 4, and the upper and lower limits of the fuel flow rate in each zone are 100 [m ³ / h] and 0 [m ³ / h] (hereinafter referred to as “m ³ / h”). It is assumed that the upper and lower limits are represented as (100, 0), the distribution ratio of the fuel flow rate to each zone is 4: 3: 2: 1, and the total operation amount is 300 [m ³ / h]. In this case, the setting of the fuel flow rate for each zone is as follows according to the above distribution ratio.

No. 1 zone 300 × (4/10) = 120 No. 2 zone 300 × (3/10) = 90 No. 3 zone 300 × (2/10) = 60 No. 4 zone 300 × (1 / 10) = 30

In the case of this example, for the zones No. 2 to No. 4, the set fuel flow rate may be within the range of the upper and lower limits, but for the zone No. 1,
The fuel flow rate of 0 [m ³ / h] exceeds the upper limit of 100 [m ³ / h]. Therefore, the fuel flow rate for the No. 1 zone is suppressed to 100 [m ³ / h], and 20 [m ³ / h] is cut off. As a result, the total operation amount actually supplied to each zone is 280 [m ³ / h], and an error of 20 [m ³ / h] from the initial value occurs.

[0010] In some cases, there are zones where the radiant tube is malfunctioning or under maintenance, or zones where the valve is closed. In this case, the fuel is supplied to the other zones in accordance with the determined distribution ratio, but no fuel can be supplied to the zone such as a malfunction. Therefore, also in this case, the initial total operation amount cannot be realized, and a control error occurs.

In some cases, the control mode is manual, and there are zones in which the operation amount cannot be changed from the process computer. In this case, even if the fuel flow rate is set according to the determined distribution ratio for the zone in which the control mode is set to manual, the operation amount of that zone is not changed. Therefore, also in this case, the initial total operation amount cannot be realized, resulting in a control error.

The initial total manipulated variable is determined so that the strip exiting through the heating furnace constituted by each annealing zone has the target temperature. Therefore,
The occurrence of an error in the total manipulated variable causes a problem that the strip temperature at the outlet of the heating furnace cannot be accurately controlled to the target temperature. Such a problem is not limited to the above-described continuous annealing line, but commonly occurs in a technique of controlling the respective operation amounts by distributing a determined total operation amount to a plurality of operation ends.

The present invention has been made to solve such a problem, and it does not matter whether the upper or lower limit of the operation amount that can be set for each operation end or the operating state of each operation end. It is an object of the present invention to appropriately distribute the load of the total operation amount to each operation end so that an error does not occur in the total operation amount.

[0014]

SUMMARY OF THE INVENTION A load distribution method according to the present invention is a load distribution method for distributing a determined total operation amount to a plurality of operation terminals. The load distribution method calculates each operation terminal in accordance with a predetermined distribution ratio. When the set operation amount exceeds the range of the upper and lower limit values, the distribution operation amount for the operation end is set to one of the upper and lower limit values, and the remaining operation amount excluding the set operation amount is left. Is distributed at the operation end of

According to another aspect of the present invention, there is provided a load distribution method for distributing a determined total operation amount to a plurality of operation terminals, wherein a distribution operation amount for an operation terminal in a mode in which the operation amount cannot be changed is fixed. And the remaining operation amount obtained by excluding the set operation amount from the total operation amount is distributed to the remaining operation terminals of the mode in which the operation amount can be changed.

Another aspect of the present invention is characterized in that the operation amount distributed to the operation end that is not in the operating state is set to zero. Also, the operation amount may be distributed to the operation end that is not in the operating state in accordance with the determined distribution ratio.

In another aspect of the present invention, the load distribution of the operation amount to each operation end is sequentially performed. As a result, when the operation amount to be further distributed remains, the remaining operation amount is targeted. In addition, a load distribution of the operation amount to each operation end is further performed.

Further, the load distribution device of the present invention is a load distribution device for distributing a load of a determined total operation amount to a plurality of operation terminals, wherein the distribution is obtained by removing the already determined operation amount from the total operation amount. Calculating means for sequentially calculating the operation amount to be distributed to each operation end according to a predetermined distribution ratio based on the target operation amount; and whether the calculated operation amount is out of the range of the upper and lower limit values of the operation end. And a limiter for setting the amount of operation to be distributed to the operating end to one of the upper and lower limits when the operating end exceeds the upper and lower limit values.

According to another aspect of the present invention, there is provided a load distribution device for distributing a determined total operation amount to a plurality of operation terminals, wherein a distribution operation amount for an operation terminal in a mode in which the operation amount cannot be changed is fixed. Fixed manipulated variable setting means for setting the value to a value,
A mode in which the operation amount can be changed based on the operation amount obtained by subtracting the operation amount of the set fixed value from the total operation amount and the distribution target operation amount excluding the operation amount that has been determined. Calculating means for sequentially calculating an operation amount to be distributed to the operation end according to a predetermined distribution ratio.

According to another aspect of the present invention, there is provided a load distribution device for distributing a determined total operation amount to a plurality of operation terminals, wherein a distribution operation amount for an operation terminal in a mode in which the operation amount cannot be changed is fixed. A fixed operation amount setting means for setting the operation amount of the fixed value, and an operation amount as a result of subtracting the operation amount of the set fixed value from the total operation amount, the distribution target operation amount excluding the operation amount which has been already determined. Calculation means for sequentially calculating the operation amount to be distributed to the operation end of the mode in which the operation amount can be changed according to a predetermined distribution ratio, and the calculated operation amount exceeding the upper and lower limit value range of the operation end. Limiter means for judging whether or not a certain operation end exceeds the upper and lower limit values, and setting the distributed operation amount to the operation end to one of the upper and lower limit values. .

In another aspect of the present invention, there is further provided a zero setting means for setting an operation amount to an operation end which is not in an operation state among the plurality of operation ends to zero.

A computer-readable recording medium according to the present invention is characterized by recording a program for causing a computer to execute the processing procedure of the load distribution method according to any one of claims 1 to 9. I do. Further, a program for causing a computer to function as each means according to any one of claims 10 to 14 may be recorded.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a functional configuration diagram showing elemental features of a load distribution device according to the present invention;
FIG. 2 is a diagram showing an example of the overall configuration when the load distribution device shown in FIG. 1 is applied to a continuous annealing line.

The load distribution device shown in FIG. 1 mainly includes a CPU,
It comprises a process computer constituted by a microprocessor having a ROM, a RAM and the like. In FIG. 1, reference numeral 1 denotes a total operation amount setting unit which sets a total amount of operation amounts distributed to a plurality of operation terminals. Reference numeral 2 denotes a distribution ratio setting unit for presetting the distribution ratio of the operation amount to each operation end.

For example, when the load distribution device of the present invention is applied to a continuous annealing line, the total operation amount corresponds to the total amount of fuel flow supplied to each radiant tube in the furnace. The total fuel flow is determined according to the target plate temperature of the strip at the furnace outlet. The distribution ratio of the fuel flow rate is set based on, for example, a uniform load pattern, a later zone high load pattern, or the like.

Reference numeral 3 denotes an operation amount distribution unit which distributes the total operation amount set by the total operation amount setting unit 1 to each operation terminal in accordance with the distribution ratio set by the distribution ratio setting unit 2. At this time, in the present embodiment, the ratio is not simply distributed as in the related art, but as described later,
The distribution is appropriately performed in consideration of the upper and lower limit values of the operation amount at each operation end, the operation state of each operation end, and the like.

In the following, the configuration within the manipulated variable distribution unit 3 will be described. Reference numeral 4 denotes a manual control detection unit. Of the plurality of operation terminals, an operation terminal (hereinafter, referred to as a control terminal) in which a manual mode in which the operation amount cannot be changed from the process computer and the operation amount can be set only manually is set as the control mode.
(Referred to as a manual operation end). The manual control detection unit 4 also detects an operation amount set at the manual operation end (hereinafter, referred to as a manual operation amount).

Here, the manual mode set externally (for example, an actual operation terminal not shown) and the manual operation amount at that time are detected by the manual control detection unit 4 in the operation amount distribution unit 3. However, the setting of the manual mode (that is, the setting of the manual operation end) and the setting of the fixed manual operation amount may be performed as an internal configuration of the operation amount distribution unit 3.

Next, reference numeral 5 denotes a manual operation amount setting unit, which sets the detected manual operation amount as an operation amount to be distributed to an operation end whose control mode is manual. Then, the manual operation amount is subtracted from the total operation amount set by the total operation amount setting unit 1, and the result is output.

Reference numeral 6 denotes a ratio calculation unit for sequentially calculating a distribution ratio in the process of performing a load distribution process. At the stage where the manual operation amount setting unit 5 has performed the distribution of the manual operation amount, a calculation for subtracting the distribution ratio of the manual operation end from the total of the distribution ratios for the respective operation terminals set by the distribution ratio setting unit 2 is performed. I do.

The manual mode is not set as the control mode, and the load distribution to the operation end (hereinafter, referred to as a controllable operation end) whose operation amount can be changed from the process computer is determined by the manual operation amount setting section 5. The operation amount remaining after the subtraction of the operation amount (hereinafter referred to as an initial distribution target operation amount) and the sum of the distribution ratios remaining after the subtraction (hereinafter referred to as an initial distribution target total ratio) are performed. .

Reference numeral 7 denotes a distribution amount calculation unit that calculates each operation amount for appropriately allocating the initial distribution target operation amount for controllable operation terminals other than the manual operation terminal. At this time, the distribution amount calculation unit 7 sequentially calculates the distribution operation amounts for the plurality of controllable operation terminals one by one. At this time, when the distribution operation amount for one controllable operation end is obtained, the obtained operation amount is subtracted from the current distribution target operation amount to obtain the remaining distribution. At the same time, the ratio calculation unit 6 subtracts the distribution ratio of the control terminals from which the above-mentioned allocated operation amounts are obtained from the total distribution ratio of the controllable control terminals that have not been distributed until then, and calculates the ratio total remaining. Ask for.

When calculating the distribution operation amount for the next controllable operation end, the current distribution target operation amount (remaining distribution) and distribution target total ratio (remaining ratio remaining) updated by such subtraction are obtained. Is used to calculate the manipulated variable. Such calculation is sequentially repeated for all controllable operation ends, thereby finally determining an operation amount to be allocated to all controllable operation ends.

Reference numeral 8 denotes an ON / OFF detection unit for detecting whether the operation state of the plurality of controllable operation ends is an ON state (operating state) or an OFF state (a pause state due to failure or maintenance). I do. The distribution amount calculation unit 7 sets this ON
The distribution operation amount for each operation end is determined according to the detection result by the / OFF detection unit 8. For example, when calculating the distribution operation amount for each controllable operation terminal, the operation amount to be distributed is set to 0 for the controllable operation terminal in the OFF state.

Reference numeral 9 denotes a limiter.
It is determined whether the distributed operation amount calculated for each controllable operation end does not exceed the upper and lower limit values that can be set for the operation end, and a limit operation is performed so that the operation amount does not exceed the upper and lower limit value. . When calculating the distribution operation amount for each controllable operation end, the distribution amount calculation unit 7 clamps the distribution operation amount so that the operation amount of the controllable operation end does not exceed the upper and lower limit values.

Next, the overall configuration and operation of the continuous annealing line in which the load distribution device of the present invention configured as described above is implemented will be described with reference to FIG. In FIG. 2, the strip 21 advances inside the heating furnace 24 by a plurality of hearth rolls 22. At this time, the strip 21 is heated by the radiant tube 23 and the inner wall of the heating furnace 24 heated by the radiant tube 23 and the atmosphere gas in the furnace.

The fuel flow to each zone constituted by a plurality of radiant tubes 23 is controlled by a plurality of fuel flow controllers 27 (corresponding to the respective operating terminals described with reference to FIG. 1) provided for each zone. ). The set value of each fuel flow controller 27 is output by a fuel flow distributor 28 (corresponding to the manipulated variable distributor 3 in FIG. 1). The fuel flow distributor 28 distributes the total fuel flow set value to each zone according to the setting of the distribution pattern setter 26 (corresponding to the distribution ratio setting unit 2 in FIG. 1).

The total fuel flow rate set value is output from the temperature controller 29 (including the total manipulated variable setting unit 1 in FIG. 1). That is, the temperature of the strip 21 is
At the outlet of 4, the temperature is detected by the temperature detector 25, and the fuel flow rate of each zone is detected by the fuel flow rate detector 31 and input to the temperature controller 29, respectively. The temperature controller 29 controls the total fuel flow based on these detected values so that the strip temperature does not deviate from the target temperature set by the temperature setting device 30.

Hereinafter, a calculation example of the manipulated variable for each annealing zone will be described, taking as an example a case where the load distribution device of the present invention is applied to a continuous annealing line as shown in FIG. Here, there are four annealing zones from No. 1 to No. 4 for load distribution, and the upper and lower limits of the fuel flow rate in each zone are (10).
0,0) [m ³ / h], the initial total operation amount set by the total operation amount setting unit 1 is 300 [m ³ / h], and the fuel flow rate for each zone set by the distribution ratio setting unit 2 It is assumed that the distribution ratio is 4: 3: 2: 1.

Further, it is assumed that there is no manual operation end in which the control mode is set to manual, and that all the zones can change the fuel flow rate from the process computer, and all the zones are in the ON state (operating state). There is. In this case, since there is no manual operation amount to be subtracted by the manual operation amount setting unit 5, the initial distribution target operation amount given to the distribution amount calculation unit 7 is 300.
[m ³ / h]. At this time, when the fuel flow rate is sequentially calculated from the No. 1 zone to the No. 4 zone, the calculation result is as follows.

No. 1 zone 300 × (4/10) = 120 → suppressed to the upper limit and set to 100 No. 2 zone 200 × (3/6) = 100 [(300-100) × (3 / ( 10-4))] No. 3 zone 100 x (2/3) = 66.7 [(200-100) x (2 / (6-3))] No. 4 zone 33.3 x (1/1) = 33.3 [ (100-66.7) × (1 / (3-2))]

That is, in the initial stage, No. 1 to No.
All of the four zones are zones to which the fuel flow is to be distributed (hereinafter, referred to as distribution target zones). In this case, when the fuel flow rate is calculated by simply assigning the ratio to the No. 1 zone, the flow rate is 120 [m ³ / h]. However, in this example, the upper limit is set to 100 [m ³ / h]. Therefore, the distribution amount calculation unit 7 sets the fuel flow rate in the No. 1 zone to 100 [m ³ / h] by the operation of the limiter 9.

Next, when calculating the fuel flow rate of the No. 2 zone, the No. 1 zone for which the fuel flow rate has already been determined is excluded from the allocation target zones, and the No. 2 to No. 4 zones are allocated. It is a target zone. In this case, 100 [m ³ / h], the fuel flow rate of the determined No. 1 zone, is subtracted from 300 [m ³ / h], which is the initial operation amount to be distributed, to obtain the remaining distribution. The allocation ratio of the No. 1 zone whose fuel flow rate has already been determined from the total allocation target ratio (= 10) (=
4) is subtracted to obtain a ratio total remaining.

Then, the fuel flow rate of the No. 2 zone is calculated by using the updated distribution target operation amount (remaining distribution) and distribution target total ratio (remaining ratio remaining). Similarly, each time the fuel flow rate for one distribution target zone is determined, the fuel flow rates of the No. 3 zone and the No. 4 zone are sequentially calculated while updating the distribution target operation amount and the distribution target total ratio. .

No. 1 to No. 4 calculated in this way
When the fuel flow rates of the respective annealing zones are summed up, the total fuel flow rate becomes 300 [m ³ / h], which matches the initial total operation amount. As described above, according to the present embodiment, regardless of the upper and lower limits of the fuel flow rate for each annealing zone and the operation state of each annealing zone, it is possible to perform load distribution so that an error does not occur in the total operation amount. it can.

According to the load distribution method of the present embodiment, the finally determined distribution ratio for each zone is almost the same as the distribution ratio set by the distribution ratio setting unit 2. Not exactly. However, in order for the strip plate temperature at the heating furnace outlet to accurately reach the target temperature, it is preferable that the total fuel flow rate strictly match rather than strictly control the distribution ratio. The results obtained are favorable in actual operation.

Next, the load distribution method according to the present embodiment is as follows.
This will be described in detail with reference to the flowcharts shown in FIGS. In FIG. 3, first, in step S1, the total operation amount and the distribution ratio set by the total operation amount setting unit 1 and the distribution ratio setting unit 2 are stored in the operation amount distribution unit 3.
Take in. Next, after setting the value of the counter N representing the zone number to 1 in step S2, the process proceeds to step S3.

In step S3, it is determined whether or not the operation end of the zone number is in the OFF state.
The determination is made by the F detection unit 8. If it is in the OFF state, the process proceeds to step S4, and the operation amount A for that zone is
After setting (N) to 0, the process proceeds to step S5. on the other hand,
If the zone is in the ON state, the process jumps to step S5 without performing the process of step S4.

In step S5, the manual control detector 4 determines whether the zone is a manual zone. If the zone is a manual zone, the process proceeds to step S6, and the operation amount A for the zone is
(N) is set to the manual operation amount JIS (N). Then, in step S7, the current distribution target operation amount (N = 1)
In this case, the value of the distribution target operation amount ZAN is updated by subtracting the manual operation amount from the total operation amount input in step S1).

Then, the process proceeds to step S8, where the value of the zone number counter N is increased by one. If it is determined in step S5 that the current zone is not a manual zone, steps S6 and S7 are not performed and step S8 is performed.
And the value of the zone number counter N is increased by one. Next, in step S9, based on the updated zone number, it is determined whether or not the above processing has been completed for all the zones. If not, the processing returns to step S3 to repeat the above processing. .

With the above processing, the operation amount of the manual operation end whose control mode is manual is subtracted from the total operation amount set by the total operation amount setting unit 1, and the initial distribution target operation amount described above is calculated. That is, the total of the operation amounts for the initial distribution target zones excluding the zones in the manual mode or the OFF state is obtained. At the same time, the operation amount for the zone in the OFF state is set to 0. In the following, the distribution of the fuel flow rate is calculated for a zone in which the control mode is not set to the manual mode and the operation state is the ON state.

That is, after exiting the process of step S9, the process proceeds to step S10 of FIG. 4, where the value of the counter N representing the zone number is set to 1, and then the process proceeds to step S1.
In step 1, it is determined whether the zone is a distribution target zone. If the zone is a distribution target zone, the process proceeds to step S12. If not (in the manual mode or the OFF state, or if the zone has already been distributed), the operation amount for that zone has already been determined. Jump to S19.

In step S12, the sum of distribution ratios for each distribution target zone, that is, the above-mentioned distribution target total ratio TDR is calculated. In the next step S13, using the calculated distribution target total ratio TDR, the operation amount A (N) of the zone is calculated as in the following equation (1). A (N) = ZAN × DR (N) / TDR (1) In the equation (1), DR (N) is the distribution ratio set by the distribution ratio setting unit 2 for the zone of the number N. .

Next, proceeding to step S14, it is determined whether or not the operation amount A (N) of the zone calculated in step S13 exceeds the upper limit value of the zone. If so, the process proceeds to step S15, where the operation amount A (N) for the zone is set to the upper limit, and then the process proceeds to step S16. On the other hand, if the calculated manipulated variable A (N) does not exceed the upper limit, the process jumps to step S16 without performing the process of step S15.

In step S16, the above-mentioned step S13 is executed.
It is determined whether or not the operation amount A (N) of the zone calculated in the step is smaller than the lower limit value of the zone. If it is below, the process proceeds to step S17, where the operation amount A (N) for that zone is set to the lower limit, and then the process proceeds to step S1.
Proceed to 8. On the other hand, if the calculated operation amount A (N) is not smaller than the lower limit, the process jumps to step S18 without performing the process of step S17.

In step S18, from the current distribution target operation amount (when N = 1, the initial distribution target operation amount calculated in step S7 in FIG. 3), the above steps S12 to S12 are executed.
The value of the distribution target operation amount ZAN is updated by subtracting the operation amount of the zone set in the processing of step S17. Then, the process proceeds to step S19, and the value of the zone number counter N is increased by one.

Thereafter, in step S20, it is determined whether or not the above processing has been completed for all the zones. If not, the flow returns to step S11 to repeat the above processing. In the processing after N = 2, in step S12, the allocation target total ratio TDR is calculated excluding the allocation ratio of the zone in which the manipulated variable has already been determined (in this case, it is not already the allocation target zone).

As described in detail above, according to this embodiment, the manual operation amount is set for the zone in which the control mode is set to manual, and the remaining operation amount is set to a value other than the manual operation end. Are distributed to the controllable operation terminals. In addition, at this time, the operation amount of the zone in the OFF state is set to 0, and the operation amount distributed to each zone in the ON state is set so as not to exceed the upper and lower limit values. I have.

Thus, while satisfying various conditions such as the upper and lower limits of the operation amount for each zone and the operation state of each zone, the operation amount is appropriately distributed to each zone, and an error occurs in the total operation amount. Can not be. Therefore, for example, when the present invention is applied to a continuous annealing line, it is possible to prevent an error from occurring in the total fuel flow rate for each zone, and to accurately control the strip plate temperature at the heating furnace outlet to the target temperature. become able to.

In the above embodiment, the operation amount is set to 0 for the zone in the OFF state, and the zone is kept in the OFF state. Such an embodiment is particularly effective in the following cases.

For example, in a gas-fired furnace, switching between ON and OFF causes pressure fluctuations in the combustion control system and fluctuations in exhaust gas component values. In the cooling gas blower control in the cooling furnace, the blower is turned on.
Switching between / OFF causes fluctuations in the furnace pressure and fluctuations in the blower motor starting current.

If it is desired to avoid such fluctuations as much as possible, an OF OF
It is effective to keep the zone in the F state in the OFF state. Therefore, in any of the examples described above, as described above, the load distribution is performed within the range of the control end that is in the ON state among the controllable control ends.

On the other hand, the zone that is currently in the OFF state may be processed as a load distribution target in the same manner as the zone that is in the ON state. In this case, the configuration of the ON / OFF detection unit 8 shown in FIG. 1 and the processing of steps S3 and S4 shown in FIG. 3 are unnecessary. Such an embodiment is, for example, a CAPL (Contin
It is necessary to positively turn ON / OFF the number of cooling stages in processes where not only the end plate temperature but also the cooling rate are important from the viewpoint of ensuring the quality of the strip, such as rapid cooling furnaces in continuous annealing and processing lines). This is effective in some cases.

It is also possible to arbitrarily switch between distributing the load in the OFF state as it is and distributing the load also in the OFF state.

(Second Embodiment) In the above embodiment,
Although the case where there are four annealing zones No. 1 to No. 4 and the distribution ratio to each zone is 4: 3: 2: 1, the invention is not limited to this. Note that the distribution ratio for each zone is 1: 2: under the same conditions as in the above-described example.
In the case of 3: 4, when the fuel flow rate is obtained in order from the No. 1 zone to the No. 4 zone, the calculation result is as follows.

No. 1 zone 300 × (1/10) = 30 No. 2 zone 270 × (2/9) = 60 No. 3 zone 210 × (3/7) = 90 No. 4 zone 120 × (4 / 4) = 120 → It is suppressed to the upper limit and set to 100

In this case, the total fuel flow rate in each of the annealing zones No. 1 to No.
[m ³ / h], which is an error of 20 [m ³ / h] from the initial total operation amount. As described above, even with the load distribution method of the present embodiment as described above, a control error may occur in the total manipulated variable depending on the situation.

The second embodiment described below is for preventing such inconvenience. That is, in the second embodiment, No. is performed in the same procedure as in the first embodiment.
The operation amount of each zone of No. 1 to No. 4 is determined in order, and if there is still a distribution remaining, the remaining distribution is targeted and the procedure of No. 4 to No. 1 is performed in a reverse procedure to the first embodiment. The operation amount of each zone is determined in order.

In the second embodiment, steps S31 to S42 as shown in FIG. 5 are added after step S20 in FIG. In FIG. 5, in a step S31, it is determined whether or not the distribution target operation amount still remains as a result of the processing shown in FIGS. If not, the process ends here.
If there are, the process proceeds to step S32.

In step S32, after setting the value of the counter N representing the zone number to the value of the last zone, it is determined in step S33 whether the zone is a distribution target zone. If it is a distribution target zone, step S3
Go to step S4, otherwise jump to step S41. In step S34, the sum of the distribution ratios for each distribution target zone, that is, the above-described distribution target total ratio T
Calculate DR.

In the next step S35, using the calculated distribution target total ratio TDR, the operation amount A '(N) of the zone is calculated as in the following equation (2). AA (N) = ZAN × DR (N) / TDR A ′ (N) = A (N) + AA (N) (2) where A (N) in FIGS. AA (N) of the operation amount of the zone obtained as a result of the processing of FIG. 3 is an additional operation calculated in accordance with the distribution ratio DR (N) of the zone with respect to the distribution remaining ZAN remaining as a result of the processing of FIGS. Quantity.

Then, the process proceeds to a step S36, and it is determined whether or not the operation amount A '(N) of the zone calculated in the step S35 exceeds the upper limit value of the zone.
If it exceeds, the operation proceeds to step S37, the operation amount A '(N) for the zone is set to the upper limit, and the operation proceeds to step S38. On the other hand, the calculated manipulated variable A '(N)
If does not exceed the upper limit, the process jumps to step S38 without performing the process of step S37.

In step S38, the above-mentioned step S35
It is determined whether or not the manipulated variable A '(N) of the zone calculated at is below the lower limit of the zone. If it is below, the operation proceeds to step S39, the operation amount A '(N) for the zone is set to the lower limit, and then the operation proceeds to step S40. On the other hand, if the calculated manipulated variable A '(N) is not below the lower limit, the process jumps to step S40 without performing the process of step S39.

In step S40, the value of the operation amount ZAN to be distributed is subtracted from the current operation amount to be allocated by subtracting the operation amount for the zone newly set in steps S34 to S39. Update. Then, the process proceeds to step S41, in which the value of the zone number counter N is reduced by one, and it is determined in step S42 whether or not the above-described processing has been completed for all zones. If not, the process returns to step S33. Repeat the above process.

As described above, according to the second embodiment,
Even if the sum of the manipulated variables set for each zone in the first process deviates from the initial total manipulated variable, the manipulated variable is further distributed by the second process in the reverse order of the first process. Thereby, the control error of the total manipulated variable can be finally eliminated.

That is, when the processing of the flowchart of FIG. 5 is performed on the calculation result shown in the above paragraph 0066, the calculation result is as follows. This is a result similar to the example described in the first embodiment, and it can be seen that the control error of the total operation amount is eliminated. No. 1 zone 30 + 3.3 × (1/1) = 33.3 No. 2 zone 60 + 10 × (2/3) = 66.7 No. 3 zone 90 + 20 × (3/6) = 100 No. 4 zone 100 ( (It can be suppressed to the upper limit in the first processing)

Although the second processing is performed in the reverse order of the first processing here, it may be performed in the same order as the first processing. Also, the number of times the process is repeated is not limited to two, and the process may be repeated a greater number of times.

In each of the above embodiments, the case where the load distribution device of the present invention is applied to a heating furnace of a continuous annealing line has been described as an example. However, the application target is not limited to this heating furnace. . For example, it may be applied to a cooling furnace of a continuous annealing line, or may be applied to a completely different field from the continuous annealing line. In short, as long as the total operation amount is determined and is distributed to a plurality of operation terminals, the present invention can be applied to any of them.

(Other Embodiments) As described above, each of the functional blocks 1 to 9 shown in FIG. 1 is constituted by a microcomputer system including a CPU or an MPU, a ROM and a RAM in the present embodiment. The operation is realized according to a program stored in a ROM or a RAM, but this may be implemented by hardware.

A program for realizing the functions of the functional blocks 1 to 9 may be externally supplied to a process computer, and the functional blocks 1 to 9 may be operated according to the program. in this case,
Means for supplying the program to a computer,
For example, a recording medium storing such a program constitutes the present invention.

As a recording medium for storing such a program, for example, a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-I,
CD-R, CD-RW, DVD, zip, magnetic tape,
Alternatively, a nonvolatile memory card or the like can be used.

The functions of the above-described embodiments are implemented when the computer executes the supplied program, and the program is executed by an OS (operating system) or other application software running on the computer. Such a program is also included in the embodiment of the present invention when the functions of the above-described embodiment are realized in cooperation with.

Further, after the supplied program is stored in the memory provided in the function expansion board of the computer or the function expansion unit connected to the computer, the program is provided in the function expansion board or the function expansion unit based on the instruction of the program. The present invention also includes a case where the CPU or the like performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0084]

As described above, according to the present invention, when the operation amount calculated for each operation end exceeds the range of the upper and lower limits, the distribution operation amount for the operation end is set to one of the upper and lower limits. And the remaining operation amount excluding the set operation amount is distributed to the remaining operation terminals, so that the operation amount distributed to each operation terminal falls within the range of the upper and lower limit values. However, it is possible to prevent an error from occurring in the total operation amount distributed to the load.

According to another feature of the present invention, the distribution operation amount for the operation end in the mode in which the operation amount cannot be changed is set to a fixed value, and the set operation amount is excluded from the total operation amount. Since the remaining operation amount is distributed to the remaining operation terminals in the mode in which the operation amount can be changed, the operation amount distributed to each operation terminal is assigned to the operation terminal in the mode in which the operation amount cannot be changed. Can set the fixed operation amount and prevent an error from occurring in the total operation amount distributed to the load.

According to another feature of the present invention, the limitation of the distribution operation amount based on the upper and lower limit values as described above, and the restriction of the distribution operation amount based on the operation end of the mode in which the operation amount cannot be changed. The fixed operation amount is set for the operation end in the mode in which the operation amount cannot be changed, and the upper and lower limit range is set as the operation amount distributed to each operation end. It is possible to prevent an error from occurring in the total operation amount distributed with the load, while keeping the inside.

Further, according to another feature of the present invention,
Since the manipulated variable for the operating terminal that is not in the operating state is set to zero, the operating amount is appropriately applied to each operating terminal regardless of the upper and lower limit values of the operating amount for each operating terminal and the operating state of each operating terminal. The load can be distributed so that no error occurs in the total manipulated variable.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing elemental features of a load distribution device according to the present invention.

FIG. 2 is a block diagram showing an example of an overall configuration when the load distribution device of the present invention shown in FIG. 1 is applied to a continuous annealing line.

FIG. 3 is a flowchart illustrating a load distribution method according to the first embodiment of the present invention.

FIG. 4 is a flowchart for explaining a load distribution method according to the first embodiment of the present invention.

FIG. 5 is a flowchart illustrating a load distribution method according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Total operation amount setting part 2 Distribution ratio setting part 3 Operation amount distribution part 4 Manual control detection part 5 Manual operation amount setting part 6 Ratio calculation part 7 Distribution amount calculation part 8 ON / OFF detection part 9 Limiter 26 Distribution pattern setting unit 27 Fuel flow controller 28 Fuel flow distributor 29 Temperature controller

Claims (16)

[Claims] A load distribution method for distributing a determined total operation amount to a plurality of operation terminals, wherein an operation amount calculated for each operation terminal according to a predetermined distribution ratio exceeds a range of upper and lower limit values. In this case, the operation amount to be allocated to the operation terminal is set to one of the upper and lower limits, and the remaining operation amount excluding the set operation amount is allocated to the remaining operation terminals. And load distribution method. 2. A load distribution method for distributing a determined total operation amount to a plurality of operation terminals, wherein a distribution operation amount for an operation terminal in a mode in which the operation amount cannot be changed is set to a fixed value, A load distribution method, wherein the remaining operation amount obtained by excluding the set operation amount from the total operation amount is distributed to the remaining operation terminals of the mode in which the operation amount can be changed. 3. The load distribution method according to claim 1, wherein the operation amount distributed to the operation end that is not in the operating state is set to zero. 4. The load distribution method according to claim 1, wherein the operation amount is distributed to the operation end that is not in the operating state in accordance with the determined distribution ratio. 5. A load distribution of an operation amount to each operation end is performed in order, and as a result, when an operation amount to be further distributed remains, an operation to each operation end is performed on the remaining operation amount. The load distribution method according to any one of claims 1 to 4, wherein the load distribution of the quantity is further performed. 6. A load distribution method for load-distributing a determined total operation amount to a plurality of operation terminals, wherein an operation amount to be distributed to a certain operation terminal according to a predetermined distribution ratio is determined from a current distribution target operation amount. A calculation step of calculating; and determining whether the operation amount calculated for the certain operation end exceeds a range of the upper and lower limit values of the operation end. A setting step of setting any of the upper and lower limits and, if not exceeding, setting the calculated operation amount as a distribution operation amount for the operation end; and setting the set operation amount to the current distribution target operation. The update amount is updated by subtracting the operation amount from the distribution target by subtracting the operation ratio from the operation amount, and by subtracting the distribution ratio from the certain operation terminal from the current total ratio from the distribution target. And a step of repeatedly executing the processes of the calculation step, the setting step, and the update step. 7. A load distribution method for distributing a determined total operation amount to a plurality of operation terminals, wherein a distribution operation amount for an operation terminal in a mode in which the operation amount cannot be changed is set to a fixed value. And setting the operation amount to be distributed to an operation end having a mode in which the operation amount can be changed from a predetermined operation amount to be distributed based on a result of subtracting the operation amount of the set fixed value from the total operation amount. A calculation step of calculating according to the distribution ratio; a second setting step of setting the operation amount calculated for the certain operation end as a distribution operation amount for the operation end; An update step of subtracting from the allocation target operation amount to update the allocation target operation amount. After the processing of the first setting step, the calculation step and the second setting step -Up and load distribution method characterized in that the process of updating step was to run repeatedly for each operating end of the mutable mode the operation amount. 8. A load distribution method for distributing a determined total operation amount to a plurality of operation terminals, wherein a distribution operation amount for an operation terminal in a mode in which the operation amount cannot be changed is set to a fixed value. And setting the operation amount to be distributed to an operation end having a mode in which the operation amount can be changed from a predetermined operation amount to be distributed based on a result of subtracting the operation amount of the set fixed value from the total operation amount. A calculation step of calculating according to the distribution ratio; and determining whether the operation amount calculated for the certain operation end exceeds the range of the upper and lower limit values of the operation end. A second setting step of setting any one of the upper and lower limits as the amount, and if not exceeding, setting the calculated operation amount as a distribution operation amount to the operation end; Subtracting the operation amount set in the setting step from the current allocation target operation amount, and updating the distribution target operation amount, after the processing in the first setting step, the calculation step, A load distribution method, wherein the processing of the second setting step and the update step is repeatedly executed for each operation terminal in a mode in which the operation amount can be changed. 9. A method according to claim 1, further comprising, after the first setting step, a third setting step of setting an operation amount to an operation end that is not in an operation state among operation ends in a mode in which the operation amount can be changed. The load distribution method according to claim 8, wherein 10. A load distribution of an operation amount to each operation end is performed in order, and as a result, when an operation amount to be further distributed remains, an operation to each operation end is performed on the remaining operation amount. The load distribution method according to any one of claims 6 to 9, wherein the load distribution of the quantity is further performed. 11. A load distribution device for distributing a determined total operation amount to a plurality of operation terminals, wherein the load distribution device performs a load distribution operation on the basis of a distribution target operation amount obtained by removing the already determined operation amount from the total operation amount. Calculating means for sequentially calculating an operation amount to be allocated to each operation terminal according to a predetermined distribution ratio; and determining whether the calculated operation amount is outside the range of upper and lower limit values of the operation terminal, A load distribution device comprising: a limiter for setting a distribution operation amount to the operation end to one of the upper and lower limits when the value exceeds the upper and lower limits. 12. A load distribution device for distributing a determined total operation amount to a plurality of operation terminals, wherein a fixed operation for setting a distribution operation amount for an operation terminal in a mode in which the operation amount cannot be changed to a fixed value. An operation amount based on an operation amount obtained by subtracting the operation amount of the set fixed value from the total operation amount and excluding the operation amount that has already been determined. And a calculating means for sequentially calculating an operation amount to be distributed to the operation end in a mode in which the operation amount can be changed according to a predetermined distribution ratio. 13. A load distributing device for distributing a determined total operation amount to a plurality of operation terminals, wherein a fixed operation for setting a distribution operation amount for an operation terminal in a mode in which the operation amount cannot be changed to a fixed value. An operation amount based on an operation amount obtained by subtracting the operation amount of the set fixed value from the total operation amount and excluding the operation amount that has already been determined. Calculating means for sequentially calculating the operation amount to be allocated to the operation end of the mode in which the operation amount can be changed in accordance with a predetermined distribution ratio; and determining whether the calculated operation amount exceeds the range of the upper and lower limit values of the operation end. A load distributing apparatus comprising: a limiter for setting an operation amount to be distributed to the operation end to one of the upper and lower limits when an operation end exceeds the upper and lower limit values. 14. The apparatus according to claim 11, further comprising: a zero setting unit for setting an operation amount of an operation end that is not in operation to zero among the plurality of operation ends. Load distribution device. 15. A computer-readable recording medium on which a program for causing a computer to execute the processing procedure of the load distribution method according to claim 1 is recorded. 16. A computer-readable recording medium on which a program for causing a computer to function as each of the means according to claim 10 is recorded.