JP3053954B2 - Parent-child valve flow control method - Google Patents
Parent-child valve flow control methodInfo
- Publication number
- JP3053954B2 JP3053954B2 JP4047219A JP4721992A JP3053954B2 JP 3053954 B2 JP3053954 B2 JP 3053954B2 JP 4047219 A JP4047219 A JP 4047219A JP 4721992 A JP4721992 A JP 4721992A JP 3053954 B2 JP3053954 B2 JP 3053954B2
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- JP
- Japan
- Prior art keywords
- valve
- operation amount
- parent
- child
- lower limit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、ターンダウン比の大き
い制御系でレンジアビリティを大きくとるために利用さ
れる親子弁流量制御方法に係り、特に、親弁の制御限界
時に発生した制御偏差を補償する技術を設けた親子弁流
量制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a flow rate of a parent-child valve used for obtaining a large rangeability in a control system having a large turn-down ratio. The present invention relates to a parent-child valve flow control method provided with a compensation technique.
【０００２】[0002]
【従来の技術】従来、流体例えば空気の流量制御時に最
大流量と最小流量との制御比が大きい流量制御系では、
親弁と子弁とを用いてレンジアビリティを大きくとる親
子弁流量制御方法が広く用いられている。この親子弁流
量制御方法は、親弁を連続制御に用いるとともにこの親
弁が最適開度範囲で働くように子弁を補助的に用いる流
量制御であって、これにより空気流量を微調整すること
ができる。2. Description of the Related Art Conventionally, in a flow control system in which a control ratio between a maximum flow rate and a minimum flow rate is large when controlling a flow rate of a fluid such as air,
A parent-child valve flow control method that uses a parent valve and a child valve to increase the rangeability is widely used. This master-slave valve flow control method is a flow control that uses a master valve for continuous control and additionally uses a slave valve so that the master valve operates in an optimum opening degree range, thereby finely adjusting an air flow rate. Can be.
【０００３】図４は従来の親子弁流量制御方法のブロッ
クフローを示す図である。まず、親弁側の制御系は、空
気流量検出器１によって検出される空気流量ＰＶと空気
流量設定値ＳＶとの制御偏差から操作量ΔＭを求める空
気流量調節計２と、この操作量ΔＭを親弁側下限切替手
段３および親弁側上限切替手段４を介して受取った後、
位置形親弁操作量ＭＶ１に変換する信号変換手段５と、
この親弁操作量ＭＶ１が所定の上限値を越えた場合に上
限切替駆動信号を出力する上限判定手段６と、親弁操作
量ＭＶ１が所定の下限値を越えた場合に下限切替駆動信
号を出力する下限判定手段７と、親弁操作量ＭＶ１を受
けて空気流量を調整する親弁８とを備えている。FIG. 4 is a diagram showing a block flow of a conventional parent-child valve flow control method. First, a control system on the parent valve side includes an air flow controller 2 for obtaining an operation amount ΔM from a control deviation between an air flow rate PV detected by an air flow rate detector 1 and an air flow rate set value SV, and an operation amount ΔM. After receiving via the parent valve side lower limit switching means 3 and the parent valve side upper limit switching means 4,
Signal conversion means 5 for converting the position-type parent valve operation amount MV1;
Upper limit determining means 6 for outputting an upper limit switching drive signal when the master valve operation amount MV1 exceeds a predetermined upper limit value, and outputting a lower limit switching drive signal when the parent valve operation amount MV1 exceeds a predetermined lower limit value. And a master valve 8 that receives the master valve operation amount MV1 and adjusts the air flow rate.
【０００４】しかして、親弁側下限切替手段３は、下限
切替駆動信号を受けると空気流量調節計２の出力を解除
して単位操作量である＋ΔＭ１を順次出力する。同様
に、親弁側上限切替手段４は、上限切替駆動信号を受け
ると空気流量調節計２の出力を解除して単位操作量であ
る−ΔＭ１を順次出力する。ここで、信号変換手段５
は、これら単位操作量＋ΔＭ１または−ΔＭ１を前回の
親弁操作量ＭＶ１n-1 に加算して位置形親弁操作量ＭＶ
１n を順次求めて親弁８に印加する。[0004] When the parent valve side lower limit switching means 3 receives the lower limit switching drive signal, it cancels the output of the air flow controller 2 and sequentially outputs the unit operation amount + ΔM1. Similarly, when the parent valve side upper limit switching unit 4 receives the upper limit switching drive signal, it cancels the output of the air flow controller 2 and sequentially outputs the unit operation amount -ΔM1. Here, the signal conversion means 5
Adds the unit operation amount + ΔM1 or −ΔM1 to the previous parent valve operation amount MV1 n-1 to add the position type parent valve operation amount MV.
1 n is sequentially obtained and applied to the parent valve 8.
【０００５】一方、子弁側の制御系は、上限切替駆動信
号を受けて単位操作量である＋ΔＭ２を順次出力する子
弁側上限切替手段９と、下限切替駆動信号を受けて単位
操作量である−ΔＭ２を順次出力する子弁側下限切替手
段１０と、前回の子弁操作量ＭＶ２n-1 に単位操作量＋
ΔＭ２または−ΔＭ２を加えて位置形子弁操作量ＭＶ２
n を順次求める子弁側信号変換手段１１と、子弁操作量
ＭＶ２を受けて空気流量を調整する子弁１２とで構成さ
れている。On the other hand, the child valve side control system receives the upper limit switching drive signal and sequentially outputs the unit operation amount + ΔM2. and Koben side lower switching means 10 for sequentially outputting certain -Derutaemu2, last child valve operation amount MV2 n-1 to the unit operation amount +
ΔM2 or −ΔM2 is added to the position type valve operation amount MV2
It comprises a child valve side signal converting means 11 for sequentially obtaining n and a child valve 12 for adjusting the air flow rate by receiving the child valve operation amount MV2.
【０００６】図５は、親子弁流量制御の動作を示すタイ
ムチャートであり、そのうち同図（ａ）は親弁操作量Ｍ
Ｖ１と子弁操作量ＭＶ２との関係を示し、同図（ｂ）は
流量設定値ＳＶと空気流量ＰＶとの関係を示す図であ
る。なお、図示する期間Ａは空気流量ＰＶが一定の場合
を示し、期間Ｂは空気流量ＰＶが変化した場合を示して
いる。FIG. 5 is a time chart showing the operation of the master-slave valve flow control, in which FIG.
FIG. 4B shows the relationship between V1 and the child valve operation amount MV2, and FIG. 4B shows the relationship between the flow rate set value SV and the air flow rate PV. The illustrated period A indicates a case where the air flow rate PV is constant, and the period B indicates a case where the air flow rate PV has changed.
【０００７】期間Ａおよび期間Ｂでは、それぞれ期間の
始めに親弁操作量ＭＶ１が所定の上限値を越えると、上
限判定手段６が上限切替駆動信号を与えて親弁側上限切
替手段４を駆動し、単位操作量−ΔＭ１が順次、信号変
換手段５で加算されて親弁操作量ＭＶ１となり親弁８に
印加される。ここで、順次加算される単位操作量−ΔＭ
１が所定値のために、空気流量ＰＶの変化の有無に拘ら
ず、期間Ａと期間Ｂとは互いに等しい時間を示す。In the periods A and B, when the parent valve operation amount MV1 exceeds a predetermined upper limit value at the beginning of each period, the upper limit determination means 6 provides an upper limit switching drive signal to drive the parent valve side upper limit switching means 4. Then, the unit operation amount -ΔM1 is sequentially added by the signal conversion means 5 to become the parent valve operation amount MV1 and applied to the parent valve 8. Here, the unit operation amount sequentially added-ΔM
Since 1 is a predetermined value, the period A and the period B indicate the same time regardless of the presence or absence of a change in the air flow rate PV.
【０００８】また、これら両期間中での子弁１２は、子
弁側上限切替手段９が上述の上限切替駆動信号を受けて
単位操作量＋ΔＭ２を出力し、この単位操作量＋ΔＭ２
から子弁側操作量印加手段１１が子弁操作量ＭＶ２を求
めて子弁１２に印加することにより制御される。In the child valve 12 during these two periods, the child valve side upper limit switching means 9 outputs the unit operation amount + ΔM2 in response to the above upper limit switching drive signal, and outputs the unit operation amount + ΔM2.
Thus, the child valve side operation amount application means 11 is controlled by obtaining the child valve operation amount MV2 and applying it to the child valve 12.
【０００９】ここで、親弁８の制御に用いた単位操作量
−ΔＭ１と子弁１２の制御に用いた単位操作量＋ΔＭ２
との符号が異なるので、親弁８と子弁１２とは互いに逆
の開閉状態で制御される。Here, the unit operation amount -ΔM1 used for controlling the parent valve 8 and the unit operation amount + ΔM2 used for controlling the child valve 12
Are different from each other, the parent valve 8 and the child valve 12 are controlled in the opposite open / closed state.
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、以上の
ような親子弁流量制御方法は、親弁操作量ＭＶ１が所定
の上下限値を越えているとき（以下、親弁の制限限界時
という。）に、所定の変化率の単位操作量±ΔＭ１のみ
から親弁操作量ＭＶ１を求めているので、制御系の現状
を示す空気流量ＰＶが流量制御に反映されない問題があ
る。However, in the above-described parent-child valve flow control method, when the parent valve operation amount MV1 exceeds a predetermined upper and lower limit value (hereinafter, referred to as a parent valve limit limit time). In addition, since the parent valve operation amount MV1 is obtained only from the unit operation amount ± ΔM1 of the predetermined change rate, there is a problem that the air flow rate PV indicating the current state of the control system is not reflected in the flow rate control.
【００１１】このため、親弁８の制限限界時に空気流量
ＰＶが変化した場合、親弁操作量ＭＶ１が上下限値内に
復帰しても空気流量ＰＶとは偏差が生じるので、制御精
度が著しく悪化する問題が出る。For this reason, if the air flow rate PV changes at the time of the limit limit of the master valve 8, even if the master valve operation amount MV1 returns within the upper and lower limit values, a deviation from the air flow rate PV occurs. There is a problem that gets worse.
【００１２】本発明は上記実情を考慮してなされたもの
で、親弁の制御限界時に発生した制御偏差に対して制御
補償を行い、制御系の制御精度を確保する親子弁流量制
御方法を提供することを目的とする。The present invention has been made in view of the above circumstances, and provides a method of controlling a flow rate of a master-slave valve, which performs control compensation for a control deviation generated at the time of a control limit of the master valve to secure control accuracy of a control system. The purpose is to do.
【００１３】[0013]
【課題を解決するための手段】請求項１に対応する発明
は、最適開度範囲で連続して流量を制御する親弁と、こ
の親弁を補助する子弁とを有し、流量検出器によって検
出された流体流量と流量設定値との制御偏差から得られ
た親弁操作量に基づいて前記各弁を操作する親子弁流量
制御方法において、前記親弁および子弁に対応して設け
られ、親弁操作量の大きさに応じてそれぞれ零値または
単位操作量を出力する親弁側上下限切替手段および子弁
側上下限切替手段と、親弁操作量に前記親弁側上下限切
替手段の出力を加えて前記親弁操作量を抑制する操作量
抑制手段とを設け、前記親弁操作量が所定の上下限値内
にある場合には前記切替手段の零値に基づき、前記制御
偏差から得られた親弁操作量により親弁のみを操作し、
前記親弁操作量が所定の上下限値を越えた場合には前記
親弁側上下限切替手段の所定の単位操作量によって抑制
された親弁操作量により親弁を操作する一方，前記子弁
側上下限切替手段の所定の単位操作量を用いて子弁を操
作し、制御偏差を補償する親子弁流量制御方法である。According to a first aspect of the present invention, there is provided a flow rate detector having a master valve for continuously controlling a flow rate within an optimum opening range and a slave valve for assisting the master valve. In the parent-child valve flow control method for operating each valve based on the parent valve operation amount obtained from the control deviation between the fluid flow rate and the flow rate set value detected by the control method, the parent valve and the child valve are provided corresponding to the parent valve and the child valve. the upper and lower limit switch means parent valve-side upper and lower limit switch means and Koben side outputs the respective zero value or unit operation amount in accordance with the size of the parent valve operation amount, the parent valve-side upper and lower limit switch to a parent valve operation amount An operation amount suppression unit that suppresses the master valve operation amount by adding an output of the unit, wherein when the master valve operation amount is within a predetermined upper and lower limit value, the control is performed based on a zero value of the switching unit. Only the parent valve is operated by the parent valve operation amount obtained from the deviation,
When the parent valve operation amount exceeds a predetermined upper / lower limit value, the parent valve is operated with the parent valve operation amount suppressed by a predetermined unit operation amount of the parent valve side upper / lower limit switching means, while the child valve is operated. This is a parent-child valve flow control method for operating a child valve using a predetermined unit operation amount of a side upper / lower limit switching means and compensating for a control deviation.
【００１４】請求項２に対応する発明は、最適開度範囲
で連続して流量を制御する親弁と、この親弁を常に開度
を保持して補助する子弁とを有し、流量検出器によって
検出された流体流量と流量設定値との制御偏差から得ら
れた親弁操作量を用いて前記各弁を可変操作する親子弁
流量制御方法において、零値または単位操作量を出力す
る子弁側上下限切替手段と、前記親弁操作量の大きさに
応じて前記子弁側上下限切替手段の出力を子弁に印加す
る子弁側操作量印加手段とを設け、常時は制御偏差から
得られた親弁操作量により親弁のみを操作し、前記親弁
操作量が所定の上下限値を越えた場合には当該親弁操作
量による前記親弁の操作の他、前記単位操作量を用いて
前記子弁を操作し、制御偏差を補償する親子弁流量制御
方法である。According to a second aspect of the present invention, there is provided a master valve for continuously controlling a flow rate within an optimum opening range, and the master valve always having an opening degree.
A child valve for holding and assisting, and variably operating each of the valves using a parent valve operation amount obtained from a control deviation between a fluid flow rate detected by a flow rate detector and a flow rate set value. In the flow rate control method, a child valve side upper / lower limit switching unit that outputs a zero value or a unit operation amount, and an output of the child valve side upper / lower limit switching unit according to the magnitude of the parent valve operation amount is applied to the child valve. A child valve side operation amount application means, and always operates only the parent valve with the parent valve operation amount obtained from the control deviation, and when the parent valve operation amount exceeds a predetermined upper / lower limit, the parent valve is operated. A parent-child valve flow control method for operating the child valve using the unit operation amount and compensating for a control deviation in addition to the operation of the parent valve by a valve operation amount.
【００１５】[0015]
【作用】従って、本発明は以上のような手段を講じたこ
とにより、親弁操作量が所定の上下限値内にある場合に
は両弁側上下限切替手段が出力する零値に基づき、制御
偏差に基づいて得られた親弁操作量を用いて親弁のみを
操作し、親弁操作量が所定の上下限値を越えた場合には
両弁側上下限切替手段が出力する所定の単位量に基づ
き、操作量抑制手段が制御偏差から得られた操作量に単
位量を加えて親弁を操作し、かつ、子弁側上下限切替手
段が出力する単位量に基づいて子弁を操作するので、親
弁操作量を適切に抑制して制御偏差を補償するようにな
り、しかも親弁操作量の抑制時でも制御系の制御精度を
確保することができる。According to the present invention, by taking the above means, when the parent valve operation amount is within the predetermined upper / lower limit value, based on the zero value output from both valve side upper / lower limit switching means, Only the parent valve is operated using the parent valve operation amount obtained based on the control deviation, and when the parent valve operation amount exceeds a predetermined upper / lower limit value, a predetermined value output from both valve side upper / lower limit switching means is output. Based on the unit amount, the operation amount suppression unit operates the parent valve by adding the unit amount to the operation amount obtained from the control deviation, and operates the child valve based on the unit amount output by the child valve side upper / lower limit switching unit. Since the operation is performed, the master valve operation amount is appropriately suppressed to compensate for the control deviation, and the control accuracy of the control system can be ensured even when the master valve operation amount is suppressed.
【００１６】また、常に親弁操作量が制御偏差を補償す
るようにしたので、親弁の制御動作が子弁の動作に追従
するときには親弁側上下限切替手段および操作量抑制手
段を省略しても、同様に制御偏差の補償により制御系の
制御精度を確保することができる。Since the master valve operation amount always compensates for the control deviation, when the master valve control operation follows the slave valve operation, the master valve upper / lower limit switching means and the operation amount suppression means are omitted. Even in this case, control accuracy of the control system can be ensured by compensating the control deviation.
【００１７】[0017]
【実施例】以下、本発明の実施例について図面を参照し
て説明する。図１は本発明に係る親子弁流量制御方法の
一実施例を説明するブロックフローを示す図であり、図
５と同一部分には同一符号を付してその詳しい説明は省
略し、ここでは異なる部分についてのみ述べる。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a block flow for explaining an embodiment of a master-slave valve flow control method according to the present invention. The same parts as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted. Only the part will be described.
【００１８】すなわち、本発明方法は、制御偏差から得
られる親弁操作量を常に親弁に与えることにより、親弁
操作量の抑制時でも親弁に制御偏差を補償させて制御系
の制御精度を確保するとともに制御系の変化に対する追
従速度を格段に速める方法であって、具体的には、空気
流量調節計２と信号変換手段５との間に操作量抑制手段
２１を設け、空気流量調節計２の出力である操作量ΔＭ
に、親弁側下限切替手段３の零値または単位操作量であ
る＋ΔＭ１を、また親弁側上限切替手段４の零値または
単位操作量である−ΔＭ１を加算して信号変換手段５に
与える構成となっている。That is, according to the method of the present invention, the master valve operation amount obtained from the control deviation is always given to the master valve, so that the master valve compensates for the control deviation even when the master valve operation amount is suppressed, thereby controlling the control accuracy of the control system. In this method, the operation amount suppressing means 21 is provided between the air flow controller 2 and the signal conversion means 5 to adjust the air flow rate. The manipulated variable ΔM that is the output of the total 2
To the signal conversion means 5 by adding the zero value of the parent valve side lower limit switching means 3 or + ΔM1 which is the unit operation amount, and the zero value of the parent valve side upper limit switching means 4 or -ΔM1 which is the unit operation amount. It has a configuration.
【００１９】前記操作量抑制手段２１は、親弁操作量の
大きさに応じて前記親弁側上下限切替手段の出力を加え
て前記親弁操作量を抑制するものであって、例えば親弁
操作量ＭＶ１が上下限値内にある場合、空気流量調節計
２からの操作量ΔＭしか入力がないので、この操作量Δ
Ｍを信号変換手段５に印加することにより親弁操作量Ｍ
Ｖ１を抑制する。The manipulated variable suppressing means 21 suppresses the master valve operation amount by adding the output of the master valve upper / lower limit switching means in accordance with the magnitude of the master valve operation amount. When the manipulated variable MV1 is within the upper and lower limit values, only the manipulated variable ΔM is input from the air flow controller 2, so that the manipulated variable Δ
By applying M to the signal conversion means 5, the parent valve operation amount M
V1 is suppressed.
【００２０】また、親弁操作量ＭＶ１が上下限値を越え
た場合、空気流量調節計２が出力する操作量ΔＭと、親
弁側下限切替手段３が出力する単位操作量＋ΔＭ１また
は親弁側上限切替手段４が出力する単位操作量−ΔＭ１
のいずれかとを加算して信号変換手段５に印加すること
により、同様に親弁操作量ＭＶ１を抑制する。次に、こ
のような構成の親子弁流量制御方法の動作について説明
する。まず、親弁操作量ＭＶ１が所定の上限値を越える
場合について述べる。When the master valve operation amount MV1 exceeds the upper and lower limit values, the operation amount ΔM output by the air flow controller 2 and the unit operation amount + ΔM1 output by the master valve side lower limit switching means 3 or the master valve side Unit manipulated variable output by upper limit switching means 4 -ΔM1
The parent valve operation amount MV1 is similarly suppressed by adding any one of the above and applying the result to the signal conversion means 5. Next, the operation of the parent-child valve flow control method having such a configuration will be described. First, a case where the master valve operation amount MV1 exceeds a predetermined upper limit will be described.
【００２１】親弁操作量ＭＶ１が所定の上限値を越える
と、上限判定手段６が上限切替駆動信号を与えて親弁側
上限切替手段４を駆動する。この親弁側上限切替手段４
は、単位操作量である−ΔＭ１を順次出力する。一方、
空気流量調節計２は、流量設定値ＳＶおよび空気流量Ｐ
Ｖから操作量ΔＭを出力する。When the parent valve operation amount MV1 exceeds a predetermined upper limit value, the upper limit judging means 6 supplies an upper limit switching drive signal to drive the parent valve side upper limit switching means 4. This parent valve side upper limit switching means 4
Sequentially outputs -ΔM1, which is a unit operation amount. on the other hand,
The air flow controller 2 calculates the flow set value SV and the air flow P
The operation amount ΔM is output from V.
【００２２】操作量抑制手段２１は、操作量ΔＭに単位
操作量である−ΔＭ１を加算して速度形の操作量抑制値
である−ΔＭ１′を順次求め、信号変換手段５に印加す
る。ここで、信号変換手段５は、前回の親弁操作量ＭＶ
１n-1 に操作量−ΔＭ１′を加算して現時点の位置形親
弁操作量ＭＶ１n を順次求めて親弁８に印加する。従っ
て、親弁８は親弁操作量ＭＶ１n に基づいて流量を調節
する。The operation amount suppression means 21 sequentially adds -ΔM1 which is a unit operation amount to the operation amount ΔM to obtain -ΔM1 'which is a speed-type operation amount suppression value, and applies it to the signal conversion means 5. Here, the signal conversion means 5 determines the last master valve operation amount MV.
The operation amount -ΔM1 ′ is added to 1 n−1 to sequentially determine the current position type parent valve operation amount MV1 n and apply it to the parent valve 8. Therefore, Oyaben 8 adjusts the flow rate based on Oyaben manipulated variable MV1 n.
【００２３】一方、子弁側の制御系は、子弁側上限切替
手段９が前記上限切替駆動信号を受けて単位操作量であ
る＋ΔＭ２を順次出力し、さらに、子弁操作量印加手段
１１では単位操作量＋ΔＭ２を前回の子弁操作量ＭＶ２
n-1 に加算して子弁操作量ＭＶ２n を順次求めて子弁１
２に印加する。従って、子弁１２は子弁操作量ＭＶ２n
に基づいて流量を調節する。同様に、親弁操作量ＭＶ１
が所定の下限値を越える場合について述べる。On the other hand, in the control system on the child valve side, the child valve side upper limit switching means 9 receives the upper limit switching drive signal and sequentially outputs + ΔM2 which is a unit operation amount. The unit operation amount + ΔM2 is the previous child valve operation amount MV2
n−1 to obtain the child valve operation amount MV2 n sequentially, and
2 Accordingly, the child valve 12 is controlled by the child valve operation amount MV2 n
Adjust the flow rate based on. Similarly, parent valve operation amount MV1
Is greater than a predetermined lower limit.
【００２４】親弁操作量ＭＶ１が所定の下限値を越える
と、下限判定手段７が下限切替駆動信号を与えて親弁側
下限切替手段３を駆動し、親弁側下限切替手段３は単位
操作量＋ΔＭ１を順次出力する。一方、空気流量調節計
２は流量設定値ＳＶおよび空気流量ＰＶから操作量ΔＭ
を出力する。When the master valve operation amount MV1 exceeds a predetermined lower limit, the lower limit determining means 7 supplies a lower limit switching drive signal to drive the master valve lower limit switching means 3, and the master valve lower limit switching means 3 performs unit operation. The amount + ΔM1 is sequentially output. On the other hand, the air flow controller 2 calculates the manipulated variable ΔM from the flow set value SV and the air flow PV.
Is output.
【００２５】操作量抑制手段２１は、操作量ΔＭに単位
操作量＋ΔＭ１を加算して速度形の操作量抑制値である
＋ΔＭ１′を順次求め、信号変換手段５に印加する。こ
の信号変換手段５は、前回の親弁操作量ＭＶ１n-1 に操
作量＋ΔＭ１′を加算して現時点の位置形親弁操作量Ｍ
Ｖ１n を順次求めて親弁８に印加する。従って、親弁８
は親弁操作量ＭＶ１n に基づいて流量を調節する。The manipulated variable suppressing means 21 sequentially adds the unit manipulated variable + ΔM1 to the manipulated variable ΔM to obtain + ΔM1 ', which is the speed-based manipulated variable suppression value, and applies it to the signal converting means 5. The signal conversion means 5 adds the operation amount + ΔM1 ′ to the previous master valve operation amount MV1 n−1 to obtain the current position type master valve operation amount M
V1 n is sequentially obtained and applied to the parent valve 8. Therefore, parent valve 8
Adjusting the flow rate based on Oyaben manipulated variable MV1 n is.
【００２６】また、子弁１２の制御について述べる。子
弁側下限切替手段１０が前記下限切替駆動信号を受けて
単位操作量−ΔＭ２を順次出力し、子弁操作量印加手段
１１が、この単位操作量−ΔＭ２を前回の子弁操作量Ｍ
Ｖ２n-1 に加算して子弁操作量ＭＶ２n を求めて子弁１
２に印加する。The control of the child valve 12 will be described. The slave valve side lower limit switching means 10 receives the lower limit switching drive signal and sequentially outputs the unit operation amount -ΔM2, and the slave valve operation amount applying means 11 converts the unit operation amount -ΔM2 to the previous slave valve operation amount M
V2 n−1 to obtain the child valve operation amount MV2 n to obtain the child valve 1
2
【００２７】次に、実際の制御状況を図２を用いて説明
する。なお、この説明は、親弁操作量ＭＶ１が所定の上
限値を越えた場合について行い、所定の下限値を越えた
場合については上限値を越えた場合と同様とする。Next, an actual control situation will be described with reference to FIG. This description is made for the case where the master valve operation amount MV1 exceeds a predetermined upper limit, and when the master valve operation amount MV1 exceeds a predetermined lower limit, the same as when the upper limit is exceeded.
【００２８】図２は親子弁流量制御方法の動作タイムチ
ャートであり、図５と同様に同図（ａ）は親弁操作量Ｍ
Ｖ１と子弁操作量ＭＶ２との関係を示し、同図（ｂ）は
流量設定値ＳＶと空気流量ＰＶとの関係を示す図であ
る。なお、図示する期間Ａ′は空気流量ＰＶが一定の場
合を示し、期間Ｂ′は空気流量ＰＶが変化した場合を示
している。FIG. 2 is an operation time chart of the master-slave valve flow control method. As shown in FIG.
FIG. 4B shows the relationship between V1 and the child valve operation amount MV2, and FIG. 4B shows the relationship between the flow rate set value SV and the air flow rate PV. It should be noted that the illustrated period A ′ indicates a case where the air flow rate PV is constant, and the period B ′ indicates a case where the air flow rate PV has changed.
【００２９】まず、期間Ａ′および期間Ｂ′では、現時
点の親弁操作量ＭＶ１n を、前回の親弁操作量ＭＶ１
n-1 に対して制御偏差を解消する向きの操作量ΔＭと所
定の単位操作量−ΔＭ１とを加算して求めている。この
ため、操作量ΔＭの分だけ期間Ａ′および期間Ｂ′は、
従来の期間Ａ，ｔB よりも短くなっている。[0029] First, in the period A 'and the period B', the parent valve operation amount MV1 n of current, previous parent valve operation amount MV1
It is obtained by adding the operation amount ΔM in the direction in which the control deviation is eliminated to n−1 and a predetermined unit operation amount −ΔM1. Therefore, the period A ′ and the period B ′ are equivalent to the operation amount ΔM,
The period is shorter than the conventional periods A and tB.
【００３０】しかし、期間Ａ′では、流量設定値ＳＶと
空気流量ＰＶとの偏差が小さいために操作量ΔＭも小さ
い値となり、実際には、期間Ａ′と期間Ａとの差はほと
んど見られない。However, in the period A ', the deviation between the flow set value SV and the air flow PV is small, so that the manipulated variable .DELTA.M is also a small value. In fact, the difference between the period A' and the period A is hardly found. Absent.
【００３１】次に、期間Ｂ′では、流量設定値ＳＶを越
える空気流量ＰＶの偏差が大きいために操作量ΔＭも負
の大きな値となる。このため、操作量抑制値であるΔＭ
＋（−ΔＭ１）も負の大きな値をとり、親弁操作量ＭＶ
１n と前回の親弁操作量ＭＶ１n-1 との差が大きくな
る。このとき、親弁操作量ＭＶ１n を求める時間間隔が
一定なので、親弁操作量ＭＶ１の傾きが大きくなり、期
間Ｂ′は、従来の期間Ｂより大幅に短くなっている。こ
れは、偏差に対する親弁操作量ＭＶ１の追従速度が向上
したことを意味している。Next, in the period B ', since the deviation of the air flow rate PV exceeding the flow rate set value SV is large, the manipulated variable .DELTA.M also has a large negative value. Therefore, the operation amount suppression value ΔM
+ (− ΔM1) also takes a large negative value, and the parent valve operation amount MV
The difference between 1 n and the previous master valve operation amount MV1 n-1 increases. At this time, since the time interval for obtaining the parent valve operation amount MV1 n is constant, the inclination of the parent valve operation amount MV1 becomes large, and the period B ′ is significantly shorter than the conventional period B. This means that the following speed of the master valve operation amount MV1 with respect to the deviation is improved.
【００３２】従って、以上のような実施例の構成によれ
ば、親弁操作量ＭＶ１を抑制するときに、操作量抑制手
段２１が、所定の変化率としての単位操作量±ΔＭ１
と、制御系の偏差を解消する向きの操作量ΔＭとを加算
して速度形の操作量抑制値を求め、信号変換手段５がこ
の操作量抑制値に基づいて位置形親弁操作量を求めて親
弁８に印加し、この親弁操作量ＭＶ１に基づいて各弁の
開閉を制御するので、制御系の変化に追従して制御系の
偏差を補償し、制御精度を格段に向上するとともに制御
速度を速めることができる。Therefore, according to the configuration of the embodiment described above, when the master valve operation amount MV1 is suppressed, the operation amount suppressing means 21 sets the unit operation amount ± ΔM1 as a predetermined change rate.
And an operation amount ΔM in the direction to eliminate the deviation of the control system to obtain a speed-type operation amount suppression value, and the signal conversion means 5 calculates a position-type master valve operation amount based on the operation amount suppression value. Control valve MV1 to control the opening and closing of each valve based on the master valve operation amount MV1, so that the deviation of the control system is compensated for following the change of the control system, and the control accuracy is remarkably improved. The control speed can be increased.
【００３３】次に、第２の実施例について図面を参照し
ながら説明する。図３は本発明に係る親子弁流量制御方
法のブロックフローを示す図であり、図１と同一部分に
は同一符号を付してその詳しい説明は省略し、ここでは
異なる部分についてのみ述べる。Next, a second embodiment will be described with reference to the drawings. FIG. 3 is a diagram showing a block flow of the parent-child valve flow control method according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, detailed description thereof will be omitted, and only different parts will be described here.
【００３４】すなわち、第２の実施例は、第１の実施例
と比べて簡易な構成で同様な制御精度を確保するもの
で、具体的には、親弁側下限切替手段３、親弁側上限切
替手段４および操作量抑制手段２１を省略して、空気流
量調節計２から操作量ΔＭを信号変換手段５に入力する
構成である。That is, the second embodiment secures the same control accuracy with a simpler configuration than the first embodiment. Specifically, the parent valve lower limit switching means 3, the parent valve side The configuration is such that the upper limit switching unit 4 and the operation amount suppression unit 21 are omitted, and the operation amount ΔM is input from the air flow controller 2 to the signal conversion unit 5.
【００３５】ここで、制御偏差から得られた操作量であ
るΔＭのみに基づいて親弁操作量ＭＶ１を抑制するの
で、親弁８の制御動作が子弁１２の動作に追従する場合
には制御系の偏差を補償して制御精度を確保することが
できる。Here, since the master valve operation amount MV1 is suppressed based only on the operation amount ΔM obtained from the control deviation, the control is performed when the control operation of the master valve 8 follows the operation of the slave valve 12. Control accuracy can be ensured by compensating for system deviations.
【００３６】上述したように、第２の実施例によれば、
制御系の偏差から得られた操作量ΔＭのみを信号変換手
段５に与えて親弁操作量ＭＶ１を抑制するので、第１の
実施例と比べて簡易な構成で制御偏差に対する補償を行
うことができる。As described above, according to the second embodiment,
Since only the operation amount ΔM obtained from the deviation of the control system is given to the signal conversion means 5 to suppress the parent valve operation amount MV1, it is possible to compensate for the control deviation with a simpler configuration than in the first embodiment. it can.
【００３７】なお、第１および第２の実施例は、流体を
空気として説明したが、他の流体を用いても同様に実施
できる。その他、本発明は、その要旨を逸脱しない範囲
で種々変形して実施できる。In the first and second embodiments, the fluid has been described as air. However, the present invention can be similarly implemented by using another fluid. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.
【００３８】[0038]
【発明の効果】以上説明したように本発明によれば、次
のような効果を奏する。As described above, according to the present invention, the following effects can be obtained.
【００３９】請求項１の発明においては、親弁操作量が
所定の上下限値内にある場合には両弁側上下限切替手段
の零値に基づき、制御偏差から得られた親弁操作量によ
り親弁のみを操作し、親弁操作量が所定の上下限値を越
えた場合には親弁側上下限切替手段の所定の単位量を与
え、制御偏差から得られる親弁操作量を抑制して親弁に
与える一方、子弁側上下限切替手段から所定の単位量を
与えて子弁を操作するので、親弁の制御限界時に発生し
た偏差に対して制御補償を行い、制御系の制御精度を確
保する親子弁流量制御方法を提供できる。According to the first aspect of the present invention, when the master valve operation amount is within the predetermined upper and lower limit values, the master valve operation amount obtained from the control deviation based on the zero value of the upper and lower limit switching means on both valve sides. By operating only the parent valve, if the parent valve operation amount exceeds the predetermined upper and lower limit value, a predetermined unit amount of the parent valve side upper and lower limit switching means is given, and the parent valve operation amount obtained from the control deviation is suppressed And the child valve is operated by supplying a predetermined unit amount from the child valve side upper / lower limit switching means. A parent-child valve flow rate control method that ensures control accuracy can be provided.
【００４０】次に、請求項２の発明においては、常に親
弁操作量が制御偏差を補償するようにしたので、親弁の
制御動作が子弁の動作に追従するときには親弁側上下限
切替手段および操作量抑制手段を省略しても、同様に親
弁の制御限界時に発生した偏差に対して制御補償を行
い、制御系の制御精度を確保する親子弁流量制御方法を
提供できる。Next, in the second aspect of the invention, the master valve operation amount is always compensated for the control deviation. Therefore, when the master valve control operation follows the slave valve operation, the master valve upper / lower limit switching is performed. Even if the means and the manipulated variable suppressing means are omitted, it is possible to provide a master-slave valve flow rate control method that similarly performs control compensation for a deviation generated when the master valve has a control limit and ensures control accuracy of the control system.
【図１】本発明に係る親子弁流量制御方法のブロックフ
ローを示す図。FIG. 1 is a diagram showing a block flow of a parent-child valve flow control method according to the present invention.
【図２】本発明に係る親子弁流量制御方法の動作タイム
チャート。FIG. 2 is an operation time chart of the parent-child valve flow control method according to the present invention.
【図３】本発明に係る親子弁流量制御方法の第２の実施
例におけるブロックフローを示す図。FIG. 3 is a diagram showing a block flow in a second embodiment of the parent-child valve flow control method according to the present invention.
【図４】従来の親子弁流量制御方法のブロックフローを
示す図。FIG. 4 is a diagram showing a block flow of a conventional parent-child valve flow control method.
【図５】従来の親子弁流量制御の動作タイムチャート。FIG. 5 is an operation time chart of a conventional parent-child valve flow control.
８…親弁、１２…子弁、２１…操作量抑制手段、ＭＶ１
…親弁操作量。8 Parent valve, 12 Child valve, 21 Operation amount suppression means, MV1
… Parent valve operation amount.
Claims (2)
親弁と、この親弁を補助する子弁とを有し、流量検出器
によって検出された流体流量と流量設定値との制御偏差
から得られた親弁操作量に基づいて前記各弁を操作する
親子弁流量制御方法において、 前記親弁および子弁に対応して設けられ、親弁操作量の
大きさに応じてそれぞれ零値または単位操作量を出力す
る親弁側上下限切替手段および子弁側上下限切替手段
と、 親弁操作量に前記親弁側上下限切替手段の出力を加えて
前記親弁操作量を抑制する操作量抑制手段とを設け、 前記親弁操作量が所定の上下限値内にある場合には前記
切替手段の零値に基づき、前記制御偏差から得られた親
弁操作量により親弁のみを操作し、前記親弁操作量が所
定の上下限値を越えた場合には前記親弁側上下限切替手
段の所定の単位操作量によって抑制された親弁操作量に
より親弁を操作する一方，前記子弁側上下限切替手段の
所定の単位操作量を用いて子弁を操作し、制御偏差を補
償することを特徴とする親子弁流量制御方法。1. A control valve for controlling a flow rate and a set flow rate of a fluid detected by a flow rate detector, comprising a master valve for controlling the flow rate continuously within an optimum opening range and a slave valve for assisting the master valve. In the parent-child valve flow control method for operating each of the valves based on the parent valve operation amount obtained from the deviation, the parent-child valve and the child valve are provided corresponding to the parent valve operation amount.
And upper and lower limit switch means on the parent valve-side lower switching means and Koben side outputs the respective zero value or unit operation amount in accordance with the size, in addition to the output of the parent valve-side upper and lower limit switch means to the parent valve operation amount An operation amount suppressing means for suppressing the master valve operation amount, wherein when the master valve operation amount is within a predetermined upper and lower limit value, a master obtained from the control deviation based on a zero value of the switching means. Only the parent valve is operated by the valve operation amount, and when the parent valve operation amount exceeds a predetermined upper / lower limit value, the parent valve operation amount suppressed by a predetermined unit operation amount of the parent valve side upper / lower limit switching means. A child valve is operated by using a predetermined unit operation amount of the child valve side upper / lower limit switching means, thereby compensating for a control deviation.
親弁と、この親弁を常に開度を保持して補助する子弁と
を有し、流量検出器によって検出された流体流量と流量
設定値との制御偏差から得られた親弁操作量を用いて前
記各弁を可変操作する親子弁流量制御方法において、 零値または単位操作量を出力する子弁側上下限切替手段
と、 前記親弁操作量の大きさに応じて前記子弁側上下限切替
手段の出力を子弁に印加する子弁側操作量印加手段とを
設け、 常時は制御偏差から得られた親弁操作量により親弁のみ
を操作し、前記親弁操作量が所定の上下限値を越えた場
合には当該親弁操作量による前記親弁の操作の他、前記
単位操作量を用いて前記子弁を操作し、制御偏差を補償
することを特徴とする親子弁流量制御方法。2. A fluid flow rate detected by a flow rate detector having a master valve for continuously controlling the flow rate in an optimum opening range and a slave valve for constantly supporting the master valve while maintaining the opening degree. A parent-child valve flow control method for variably operating each of the valves by using a parent valve operation amount obtained from a control deviation between the flow rate set value and a child valve side upper and lower limit switching unit that outputs a zero value or a unit operation amount. A child valve side operation amount application means for applying an output of the child valve side upper / lower limit switching means to the child valve in accordance with the magnitude of the parent valve operation amount, and a parent valve operation normally obtained from a control deviation. When only the parent valve is operated by the amount and the parent valve operation amount exceeds a predetermined upper and lower limit value, in addition to the operation of the parent valve by the parent valve operation amount, the child valve is operated by using the unit operation amount. And controlling the control deviation to control the flow rate of the parent-child valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4047219A JP3053954B2 (en) | 1992-03-04 | 1992-03-04 | Parent-child valve flow control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4047219A JP3053954B2 (en) | 1992-03-04 | 1992-03-04 | Parent-child valve flow control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05250043A JPH05250043A (en) | 1993-09-28 |
| JP3053954B2 true JP3053954B2 (en) | 2000-06-19 |
Family
ID=12769069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4047219A Expired - Fee Related JP3053954B2 (en) | 1992-03-04 | 1992-03-04 | Parent-child valve flow control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3053954B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1280472B1 (en) * | 1995-09-21 | 1998-01-20 | Rotfil Srl | TUBULAR HEATING ELEMENT AND ITS PRODUCTION PROCESS |
-
1992
- 1992-03-04 JP JP4047219A patent/JP3053954B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05250043A (en) | 1993-09-28 |
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