JP3716294B2 - Three-position control method and three-position control apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a three-position control method and a three-position control apparatus. More specifically, for example, the present invention relates to a three-position control method and a three-position control apparatus that control the room temperature so as to keep the set temperature.
[0002]
[Prior art]
Conventionally, when the room temperature is controlled to a target value by a heating device (heater) and a cooling device (cooler), temperature control by the cooling device has a time delay and control accuracy cannot be secured due to the difficulty of the control. Therefore, the heating device is appropriately operated while continuously operating the cooling device.
[0003]
However, in such a conventional control method, the energy efficiency is low due to the large energy loss due to the fact that the cooling device is always operated and the heating device is heating while cooling by the cooling device. There is.
[0004]
Therefore, a two-position control method and a three-position control method have been proposed for the purpose of eliminating the above-mentioned drawbacks.
[0005]
In the two-position control method, as shown in FIG. 8, the detected value T of the indoor temperature to be controlled._prIs set temperature T_pkWhen the temperature is lower than, the heating device is operated, and when it is higher, the cooling device is operated to control the room temperature to be kept near the set value. Such a two-position control method can accurately control the temperature in the vicinity of the set temperature, but has a problem that the running cost is still high because it is necessary to always operate the heating device or the cooling device.
[0006]
In addition, as shown in FIG._pkCooling control target value T higher than the predetermined temperature_pcAnd set temperature T_pkHeating control target value T lower than the predetermined temperature_phSet. And indoor temperature T_prIs set temperature T_pkIf the temperature is lower than_prIs the heating control target value T_phIf the temperature falls below, the heating device is turned on and the room temperature T_prIs the heating control target value T_phIf it exceeds, the operation of turning off the heating device is repeated. Also, the room temperature T_prIs set temperature T_pkIf it is higher than the room temperature T_prIs the cooling control target value T_pcIf the temperature exceeds, the cooling device is turned on and the room temperature T_prIs the cooling control target value T_pcIf it falls below, the operation of turning off the cooling device is repeated.
[0007]
The three-position control method has an advantage that the running cost can be suppressed as compared with the two-position control method because the room temperature is controlled by turning on or off one of the heating device and the cooling device. However, since the room temperature is controlled not in the set temperature but in the vicinity of the cooling control target value or the heating control target value, there is a problem that control cannot be performed to the set temperature and control accuracy is poor.
[0008]
As an attempt to eliminate such disadvantages of the conventional two-position control method and three-position control method, Japanese Patent Application Laid-Open No. 8-54901 proposes a load selection control method. In this method, as shown in FIG._prFor example, heating control target value T_phThe heating device is turned on when the temperature falls below the temperature, and once the heating device is turned on, the room temperature T_prIs set temperature T_pkIf the temperature exceeds, the heating device is turned off and the room temperature T_prIs set temperature T_pkIf it falls below, the operation of turning on the heating device is repeated. Also, the room temperature T_prIs the cooling control target value T_pcIs exceeded, the cooling device is turned on. Once the cooling device is turned on, the room temperature T_prIs set temperature T_pkIf the temperature is lower than, the cooling device is turned off and the room temperature T_prIs set temperature T_pkIf it exceeds, the operation of turning on the cooling device is repeated.
[0009]
In this load selection control method, the control temperature can be controlled relatively close to the set temperature in a steady state, and the temperature is controlled by turning on or off only one of the heating device and the cooling device. There is an advantage that an increase in running cost can be suppressed.
[0010]
However, the load selection control method has a large control sag when switching between control by turning on / off the heating device and control by turning on / off the cooling device (see point G in FIG. 10), and control accuracy in a state other than the steady state There is a problem that may become worse.
[0011]
[Problems to be solved by the invention]
The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a three-position control method and a three-position control apparatus capable of suppressing running costs and improving control accuracy. It is said.
[0012]
[Means for Solving the Problems]
  Three-position control method of the present inventionFirst form ofIs a three-position control method for controlling the control amount so as to be held around the set value by a control amount increasing means for increasing the control amount and a control amount decreasing means for decreasing the control amount. An upper control target value for controlling the control amount lowering means is set at a predetermined position.Procedure andA lower control target value for controlling the control amount raising means is set at a predetermined position below the set value.Procedure and, Correction processing for correcting the control target value closer to the set valueIn the correction processing procedure, when the measured value of the control amount is higher than the set value, a deviation of the measured value from the set value is calculated, and the deviation is calculated by an integration coefficient. Calculate the current correction value, subtract the current correction value from the upper control target value, and set the subtraction result as a new upper control target valueIt is characterized by that.The second form of the three-position control method of the present invention is a three-position control in which the control amount is controlled to be held around the set value by the control amount raising means for raising the control amount and the control amount lowering means for lowering the control amount. A control method for setting an upper control target value for controlling the control amount lowering means at a predetermined position above the set value, and controlling the control amount increasing means at a predetermined position below the set value. And a correction processing procedure for performing correction processing to bring the control target value closer to the set value. In the correction processing procedure, the measured value of the control amount is less than or equal to the set value. In this case, a deviation between the measured value and the set value is calculated, the deviation is calculated using an integration coefficient to calculate a current correction value, and the current correction value is added to the lower control target value. The new downward control eyes And sets the value. The third form of the three-position control method of the present invention is a three-position control in which the control amount is controlled to be held around the set value by the control amount increasing means for increasing the control amount and the control amount decreasing means for decreasing the control amount. A control method for setting an upper control target value for controlling the control amount lowering means at a predetermined position above the set value, and controlling the control amount increasing means at a predetermined position below the set value. A procedure for setting a lower control target value for correction, and a correction processing procedure for performing correction processing for bringing the control target value closer to the set value,  In the correction processing procedure, a deviation between the measured value of the control amount and the set value is calculated, the deviation is calculated using an integration coefficient, a current correction value is calculated, and the current correction value is calculated as the upper control target value. And subtracting from the lower control target value, and setting the subtraction result as a new upper control target value and lower control target value.
[0013]
In the three-position control method of the present invention, when the control amount suddenly changes and exceeds the upper limit value, the upper control target value is forced to be the initial upper control target value, and the control amount suddenly changes and exceeds the lower limit value Preferably, the lower control target value is forcibly set as the initial lower control target value.
[0014]
On the other hand, the first embodiment of the three-position control device of the present invention includes a control amount raising means for raising the control amount, and a control amount lowering means for lowering the control amount.ControlControl amount is held around the set valueMakeA three-position control device, wherein the three-position control device comprises control means;The control target value is corrected based on the determination means and the determination result of the determination meansTarget value correction means, and the control means controls the control amount lowering means by the upper control target value.YouAnd the control amount raising means is controlled by the lower control target value.ShiThe target value correcting means isWhen it is determined by the determination means that the measured value of the control amount is higher than the set value, a deviation from the set value of the measured value is calculated, and the deviation is calculated by an integration coefficient and corrected this time Is calculated, the current correction value is subtracted from the upper control target value, and the subtraction result is set as a new upper control target value.Correction processing is performed.The second form of the three-position control device of the present invention is a three-position control in which the control amount is raised around the set value by controlling the control amount raising means for raising the control amount and the control amount lowering means for lowering the control amount. The three-position control device includes a control unit, a determination unit, and a target value correction unit that corrects a control target value based on a determination result of the determination unit. The control amount lowering means is controlled by a control target value, and the control amount increasing means is controlled by a downward control target value. The target value correcting means causes the determination means to make the measured value of the control amount equal to or less than the set value Is calculated, the deviation of the measured value from the set value is calculated, the deviation is calculated using an integration coefficient to calculate the current correction value, and the current correction value is added to the lower control target value. , This addition result to a new downward And correcting process is set as control target value. The third form of the three-position control device of the present invention is a three-position control that controls a control amount raising means for raising the control amount and a control amount lowering means for lowering the control amount to hold the control amount around the set value. The three-position control device includes a control unit and a target value correction unit that corrects a control target value, and the control unit controls the control amount lowering unit based on the upper control target value. The control amount increasing means is controlled by a downward control target value, and the target value correcting means calculates a deviation of the measured value of the control amount from the set value, and calculates the deviation using an integration coefficient. A correction value is calculated, the current correction value is subtracted from the upper control target value and the lower control target value, and correction processing is performed to set the subtraction result as a new upper control target value and a lower control target value. To do.
[0015]
Three-position control device of the present inventionInThe three-position control devicefurtherA target value forcibly changing means, the target value forcibly changing means,If the control amount changes suddenly and exceeds the upper limit value, the upper control target value is forcibly set to the initial upper control target value. If the control amount changes suddenly and exceeds the lower limit value, the lower control target value is forcibly set to the initial value. Lower control target valueRuIs preferred.
[0016]
[Action]
Since the present invention is configured as described above, the control amount increasing means and the control amount decreasing means can be controlled in the vicinity of the set value, and the control is disturbed when the control amount increasing means and the control amount decreasing means are switched. There is no risk of it occurring. Further, according to the preferred embodiment of the present invention, even if a sudden change occurs in the control amount, the influence can be minimized.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, although the present invention is explained based on an embodiment, referring to an accompanying drawing, the present invention is not limited only to this embodiment.
[0018]
Embodiment 1
FIG. 1 shows a schematic configuration of a temperature control system to which the three-position control method according to Embodiment 1 of the present invention is applied, and FIG. 2 shows a schematic flowchart of the temperature control system.
[0019]
The temperature control system 10 uses a room temperature T as a controlled variable._rSet value T_kIs a temperature management system for controlling to maintain a set value T_k, Cooling control target value (upward control target value) T_c, Heating control target value (downward control target value) T_h, Upper limit T_U, Lower limit T_L, The capacity (heat quantity) of the heating / cooling source, that is, the capacity of the heating device 60 and the cooling device 70 and the room temperature T_rAn input unit 20 for inputting an integration coefficient n set in accordance with a balance with a change amount (heat amount) of_rA detection unit 30 having a temperature sensor for measuring the temperature, and an indoor temperature T measured by the detection unit 30_rSet value T_kAnd a drive unit that drives the heating device (heating unit, control amount raising unit) 60 and the cooling device (cooling unit, control amount lowering unit) 70 in accordance with the control result of the control unit 40. 50.
[0020]
Here, the integration coefficient n is, for example, 10, and the cooling control target value T_cIs the set value T_kPredetermined temperature T₁Heat control target value T_hIs the set value T_kPredetermined temperature T₂Each is set to a low value. In addition, the upper limit value T_UIs generally the cooling control target value T_cPredetermined temperature T_ThreeHigher value, lower limit T_LIs generally a heating control target value T_hPredetermined temperature T_FourEach is set to a low value. However, the upper limit T_UIs the cooling control target value T_cTo the lower limit T_LIs the heating control target value T_hMay be matched.
[0021]
The control unit 40 controls, for example, activation or deactivation of each of the heating device (heating unit) 60 and the cooling device (cooling unit) 70 according to the measurement result by the detection unit 30 as in the normal three-position control. Control means 41 for on / off control and measured indoor temperature T_rIn the room temperature T_rIs the upper limit T_UOr lower limit T_LDetermination means 42 for determining whether or not the measured indoor temperature T_rHeating control target value T that functions as a threshold value for turning on and off heating device 60 and cooling device 70 respectively._hAnd cooling control target value T_cThe measured room temperature T_rTarget value correcting means 43 for correcting the temperature in accordance with the measured indoor temperature T_rWhen there is a sudden change in the heating control target value T_hAnd cooling control target value T_cAnd forcibly changing target value 44 to an initial value.
[0022]
Next, the control contents of the temperature control system 10 will be described with reference to FIG.
[0023]
First, the initial set value T of the room temperature_k0Initial heating control target value T_h0, Initial cooling control target value T_c0, Upper limit T_U, Lower limit T_LThen, an integration coefficient n and the like are set (step S1). Next, the room temperature T_rIs measured (step S2). Measured room temperature T_rIs sent to the control means 41 and the determination means 42. The control means 41 receives the input indoor temperature T_rBased on the above, on / off of the heating device 60 and the cooling device 70 is controlled (step S3). Further, the determination means 42 receives the input indoor temperature T_rIt is determined whether or not there has been a sudden change (step S4). Indoor temperature T_rIf there is no sudden change, the target value correcting process is performed by the target value correcting means 43 (step S5). On the other hand, the room temperature T_rIf there is a sudden change, the target control value is forcibly changed by the target value forced change means 44 (step S6).
[0024]
Hereinafter, the process in each means 41, 43, 44 is demonstrated more concretely.
[0025]
First, the processing in the control means 41 will be described with reference to FIG.
[0026]
The processing in the control means 41 is repeatedly executed every predetermined time (for example, 1000 ms).
[0027]
In the process by the control means 41, as shown in FIG._rIs the cooling control target value T_cIt is determined whether it is higher (step S11). If it is higher, it is determined whether or not the heating device (heater) 60 is off (step S12). If it is not off, it is turned off (step S13). If it is off, the cooling device (cooler) 70 is turned on as it is. It is determined whether or not (step S14). If the cooling device 70 is not on, it is turned on (step S15), and if it is on, the process returns to the start as it is.
[0028]
In step S11, the room temperature T_rIs the cooling control target value T_cIf it is lower, the room temperature T_rIs the heating control target value T_hIt is determined whether it is lower (step S16). If it is low, it is determined whether or not the heating device 60 is on (step S17). If it is off, it is turned on (step S18). If it is on, it is determined whether or not the cooling device 70 is off. Determination is made (step S19). If the cooling device 70 is not off, it is turned off (step S20), and if it is off, the process returns to the start as it is.
[0029]
In step S16, the room temperature T_rIs the heating control target value T_hIf higher, it is determined whether or not the heating device 60 is off (step S21). If not, the heating device 60 is turned off (step S22). If it is off, the cooling device 70 is turned off as it is. Is determined (step S23). If the cooling device 70 is not off, it is turned off (step S24), and if it is off, the process returns to the start.
[0030]
Thereby, the cooling control target value T_cIn the higher temperature range, the cooling device 70 is turned on, and the heating control target value T_hIn the lower temperature region, the heating device 60 is turned on, and the cooling control target value T_cAnd heating control target value T_hA normal three-position control process in which both the cooling device 70 and the heating device 60 are turned off is performed in the temperature region between the two.
[0031]
Next, the correction process of the control target value by the target value correcting unit 43 will be described with reference to FIG.
[0032]
In the control target value correction process, first, the measured indoor temperature T_rIs the set value T_kOr not (step S31). T if high_rT from the value_kThe value is subtracted from the room temperature T_rAnd set value T_kDeviation T_dIs calculated (step S32), and this T_dThe value is calculated by the integration coefficient n, for example, division or multiplication (step S33), and the current correction value T_dsAnd T calculated_dsValue is the cooling control target value T_cAnd subtract the result of this subtraction_cSet as a value (step S34) and return to the start.
[0033]
In step S31, the room temperature T_rIs the set value T_kT if_kT from the value_rThe value is subtracted from the room temperature T_rAnd set value T_kDeviation T_dIs calculated (step S35), and this T_dThe value is calculated by the integration coefficient n, for example, division or multiplication (step S36), and the current correction value T_dsAnd T calculated_dsValue is the heating control target value T_hAnd add the result of the addition to T_hSet as a value (step S37) and return to the start. The division or multiplication in the arithmetic processing is appropriately selected depending on the value of the integration coefficient n. For example, division is performed when the integration coefficient n is 10, while multiplication is performed when the integration coefficient n is 0.1. Made. However, generally, the capacity (heat amount) of the heating / cooling source, that is, the capacity of the heating device 60 and the cooling device 70 is larger than the amount of change in room temperature (heat amount), so the integration coefficient n is set to be a division.
[0034]
In the process according to FIG. 4, the room temperature T is determined in step S31._rIs the set value T_kWhen it is determined that the heating control target value T_hDeviation T_dHowever, depending on the conditions of the surrounding environment, the room temperature T_rIs the set value T_kIn the case where it is kept, the processing of steps S35 to S37 may be skipped without performing this correction processing, and the processing may return to step S31. This eliminates the need to operate the heating device 60 and the cooling device 70 and provides an advantage that unnecessary power is not used.
[0035]
With the above processing, the room temperature T_rIs controlled by turning on / off the cooling device 70, the cooling control target value T_cIs the set value T at a speed corresponding to the integration coefficient n._kThe room temperature T_rFollows the set value T_kIt is controlled by turning on / off the cooling device 70 in the vicinity of.
[0036]
On the other hand, the room temperature T_rIs controlled by turning on / off the heating device 60, the heating control target value T_hIs the set value T at a speed corresponding to the integration coefficient n._kThe room temperature T_rFollows the set value T_kIs controlled by turning the heating device 60 on and off.
[0037]
That is, as shown in FIG._rIs controlled by turning on / off the cooling device 70, the indoor temperature T_rGradually decreases and the heating control target value T_hWhen the temperature falls below the value, the heating control target value T_hThe room temperature T when the heating device 60 is turned on and off with reference value_rIs started and the heating control target value T_hIs the set value T_kGradually approaching. At this time, the cooling control target value T_cThe initial cooling control target value T_c0To the heating control target value T_hAnd cooling control target value T_cIt is preferable to control so as to keep the interval between and constant.
[0038]
Similarly, the room temperature T_rIs controlled by turning on / off the heating device 60, and the room temperature T_rGradually increases and the cooling control target value T_cExceeds the cooling control target value T_cThe room temperature T due to turning on / off of the cooling device 70 with reference as the reference value_rIs started and the cooling control target value T_cIs the set value T_kGradually approaching. At this time, the heating control target value T_hInitial heating control target value T_h0To the heating control target value T_hAnd cooling control target value T_cIt is preferable to control so as to keep an interval between
[0039]
As a result, the room temperature T is always maintained._rSet value T_kIt can be held around. Next, forcibly changing the control target value by the target value forcibly changing means 44 will be described with reference to FIG.
[0040]
First, the measured room temperature T_rIs the upper limit T_UIs determined (step S41). Indoor temperature T_rIs the upper limit T_UIf it exceeds, the control target value is set to the initial cooling control target value T._c0Forcibly change to (step S42). On the other hand, the room temperature T_rIs the upper limit T_UIf not, the control target value is set to the initial heating control target value T._h0Forcibly change to (step S43). As a result, the room temperature T_rSuddenly changes and the upper limit T_UAnd lower limit T_LEven if the situation exceeds, the room temperature T_rQuickly target value T_kCan approach. In this case, the first measured indoor temperature T_rIs the lower limit T_LIt may be determined whether or not the number exceeds.
[0041]
Thus, in the temperature control system 10 of the first embodiment, the room temperature T_rIs the set value T_kIn a higher state, a cooling control target value T that functions as a reference value for turning on / off the cooling device 70_cSet value T_kThe temperature is controlled to be close to the room temperature T_rIs the set value T_kIn a lower state, the heating control target value T that functions as a reference value for turning on / off the heating device 60_hSet value T_kThe room temperature T_rCan be controlled with high accuracy and low running cost, and control dripping at the time of switching the operation of the cooling device 70 and the heating device 60 can be suppressed._rIs the upper limit T_UAnd lower limit T_LIt is possible to respond quickly to any abnormal situation exceeding.
[0042]
Embodiment 2
Next, Embodiment 2 of the present invention will be described with reference to FIG. The temperature control system to which the three-position control method according to the second embodiment is applied differs from the first embodiment only in the correction processing of the control target value by the target value correction means 43, and the procedure will be described. Description is omitted.
[0043]
The control target value correction process of the second embodiment is repeatedly executed every predetermined time (for example, 1000 ms) as in the first embodiment. That is, first, the measured room temperature T_rTo set value T_kIs subtracted (step S51), and the room temperature T_rAnd set value T_kDeviation T_dIs calculated (step S52). This T_dThe value is calculated by the integration coefficient n, for example, division or multiplication (step S53), and the current correction value T_dsAnd T calculated_dsValue is the cooling control target value T_cAnd heating control target value T_hAnd subtracting the results of these subtractions from T_cValue and T_hSet as a value (step S54) and return to the start.
[0044]
That is, the room temperature T_rIs the set value T_kIn the case of the above, the cooling control target value T that functions as a reference value for turning on and off the cooling device 70_cIs the set value T_kGradually approaches the heating control target value T_hIs the cooling control target value T_cCooling control target value T so that the difference between_cIt changes following.
[0045]
Similarly, the room temperature T_rIs the set value T_kIf it is less than the heating control target value T that functions as a reference value for turning the heating device 60 on and off_hIs the set value T_kGradually approaches the cooling control target value T_cIs the heating control target value T_hHeating control target value T so that the difference between_hIt changes following.
[0046]
Thereby, the cooling control target value T_cAnd heating control target value T_hInitial value T_c0, T_h0Cooling control target value T without resetting to_cAnd heating control target value T_hIt is possible to keep a predetermined interval.
[0047]
As mentioned above, although this invention has been demonstrated based on each embodiment, this invention is not limited only to this embodiment, A various change is possible. For example, in the present embodiment, the control amount is the room temperature, but the control amount is not limited to the room temperature, and can be various, for example, the water temperature.
[0048]
【The invention's effect】
As described above in detail, in the present invention, when the control amount is controlled to be kept at the set value by the operation of the control amount increasing means for increasing the control amount and the control amount decreasing means for decreasing the control amount, Each control target value for switching on / off of each of the control amount raising means and the control amount lowering means is set based on a set value, and each control target value is set according to a deviation between the control amount and the set value. Since the correction is performed, it is possible to control the control amount in the vicinity of the set value by controlling only one of the control amount increasing means and the control amount decreasing means, for example, switching between ON and OFF, thereby suppressing the running cost. It is possible to achieve the excellent effect that the control accuracy can be improved.
[0049]
Further, according to the preferred embodiment of the present invention, even if a sudden change occurs in the control amount, the influence can be minimized.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a temperature control system to which a three-position control method according to Embodiment 1 of the present invention is applied.
FIG. 2 is a schematic flowchart of the temperature control system.
FIG. 3 is a flowchart showing a processing procedure by a control unit.
FIG. 4 is a flowchart showing a processing procedure by a target value correcting unit.
FIG. 5 is a graph showing an example of control by the temperature control system.
FIG. 6 is a flowchart illustrating a processing procedure performed by a target value forced change unit.
FIG. 7 is a flowchart showing a processing procedure by target value correction means of a temperature control system to which a three-position control method according to Embodiment 2 of the present invention is applied.
FIG. 8 is a graph for explaining conventional two-position control.
FIG. 9 is a graph for explaining the conventional three-position control.
FIG. 10 is a graph for explaining an example of a conventional improved technique.
[Explanation of symbols]
10 Temperature control system
20 Input section
30 detector
40 Control unit
41 Control means
42 judging means
43 Target value correction means
44 Target value forced change means
50 Drive unit
60 Heating device (heater, heating means, control amount raising means)
70 Cooling device (cooler, cooling means, control amount lowering means)
T_r         Indoor temperature (control amount)
T_k         Setting value
T_c         Cooling control target value (upward control target value)
T_h         Heating control target value (downward control target value)
T_U         upper limit
T_L         lower limit

Claims (8)

A three-position control method for controlling a control amount to be held around a set value by a control amount raising means for raising the control amount and a control amount lowering means for lowering the control amount,
A procedure for setting an upper control target value for controlling the control amount lowering means at a predetermined position above the set value;
A procedure for setting a lower control target value for controlling the control amount raising means at a predetermined position below the set value;
Correction processing procedure for correcting the control target value closer to the set value
Including
In the correction processing procedure, when the measured value of the control amount is higher than the set value, the deviation of the measured value from the set value is calculated, and the current correction value is calculated by calculating the deviation using an integration coefficient. The three-position control method , wherein the current correction value is subtracted from the upper control target value, and the subtraction result is set as a new upper control target value . A three-position control method for controlling a control amount to be held around a set value by a control amount raising means for raising the control amount and a control amount lowering means for lowering the control amount,
A procedure for setting an upper control target value for controlling the control amount lowering means at a predetermined position above the set value;
A procedure for setting a lower control target value for controlling the control amount raising means at a predetermined position below the set value;
Correction processing procedure for correcting the control target value closer to the set value
Including
In the correction processing procedure, when the measured value of the control amount is equal to or less than the set value, a deviation between the measured value and the set value is calculated, and the current correction value is calculated by calculating the deviation using an integration coefficient. The current correction value is added to the lower control target value, and the addition result is set as a new lower control target value.
A three-position control method characterized by that. A three-position control method for controlling a control amount to be held around a set value by a control amount raising means for raising the control amount and a control amount lowering means for lowering the control amount,
A procedure for setting an upper control target value for controlling the control amount lowering means at a predetermined position above the set value;
A procedure for setting a lower control target value for controlling the control amount raising means at a predetermined position below the set value;
Correction processing procedure for correcting the control target value closer to the set value
Including
In the correction processing procedure, a deviation between the measured value of the control amount and the set value is calculated, the deviation is calculated using an integration coefficient, a current correction value is calculated, and the current correction value is calculated as the upper control target value. And the lower control target value is subtracted, and the subtraction result is set as a new upper control target value and lower control target value.
A three-position control method characterized by that. If the control amount exceeds the upper limit value suddenly changes, and the upper side control target value forcibly initial upper side control target value, when the control quantity exceeds the lower limit value suddenly changes, forcing the lower side control target value claim 1, 2 or 3 SL placing three position control method characterized by to the initial under side control target value. A three-position control device for controlling a control amount raising means for raising a control amount and a control amount lowering means for lowering the control amount to hold the control amount around a set value;
The three-position control device includes a control unit, a determination unit, and a target value correcting means for correcting the control target value based on the determination result of the determination means,
It said control means, The rewritable control the control amount lowering means by the upper control target value, controls the control amount increases means by downregulating the target value,
When the target value correcting means determines that the measured value of the control amount is higher than the set value by the determining means, the deviation of the measured value from the set value is calculated, and the deviation is calculated by an integration coefficient. A three-position control device characterized in that a correction value is calculated by calculating a current correction value, subtracting the current correction value from the upper control target value, and setting the subtraction result as a new upper control target value . A three-position control device for controlling a control amount raising means for raising a control amount and a control amount lowering means for lowering the control amount to hold the control amount around a set value;
The three-position control device has control means, determination means, and target value correction means for correcting the control target value based on the determination result of the determination means,
The control means controls the control amount lowering means with an upper control target value, and controls the control amount raising means with a lower control target value,
The target value correcting unit calculates a deviation of the measured value from the set value when the measured value of the control amount is determined to be equal to or less than the set value by the determining unit, and calculates the deviation using an integration coefficient. Then, the current correction value is calculated, the current correction value is added to the lower control target value, and the correction result is set as a new lower control target value.
A three-position control device characterized by that. A three-position control device for controlling a control amount raising means for raising a control amount and a control amount lowering means for lowering the control amount to hold the control amount around a set value;
The three-position control device has control means and target value correction means for correcting the control target value,
The control means controls the control amount lowering means with an upper control target value, and controls the control amount raising means with a lower control target value,
The target value correction means calculates a deviation of the measured value of the control amount from the set value, calculates the current correction value by calculating the deviation using an integration coefficient, and uses the current correction value as the upper control target. Subtraction is performed from the value and the lower control target value, and the subtraction result is set as a new upper control target value and lower control target value.
A three-position control device characterized by that. The three-position control device further has a target value forced change means,
When the target value forced change means suddenly changes the control amount to exceed the upper limit value, the upper control target value is forcibly set as the initial upper control target value, and when the control amount suddenly changes and exceeds the lower limit value, three position control device according to claim 5, 6 or 7, wherein the forcing said initial lower control target value and to Rukoto the control target value.

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