JP3540627B2

JP3540627B2 - Distributing valve control device

Info

Publication number: JP3540627B2
Application number: JP27540698A
Authority: JP
Inventors: 瓶和彦二; 山泰治小; 島潮子宮; 本靖雄山; 島康行宮
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 1998-09-29
Filing date: 1998-09-29
Publication date: 2004-07-07
Anticipated expiration: 2018-09-29
Also published as: JP2000105610A

Description

【０００１】
【発明の属する技術分野】
本発明は、振り分け弁制御装置に係り、加圧された流体流入部に設置された第１の弁と前記流体流入部から流体が流入する複数の分岐した低圧の流体流出部の各々に設置された複数の第２の弁の各々の弁を制御する振り分け弁制御装置に関する。
【０００２】
【従来の技術】
例えば、上水道プラントにおいては、図１０に示すように、薬品注入機６から注入管３を介して、注入地点２に薬品を注入する。このとき、薬品注入機６には注入を行うために必要な圧力が加圧ポンプ１によって与えられている。注入地点２における薬品注入率は、一定に保つ必要がある。したがって、注入地点２の流量変化に応じて、薬品濃度を変更しなければならない。また、薬品濃度を変更する場合、注入管路長に起因する注入遅れを回避するために、補水弁Ｖ４によって一時的に流量Ｑの増減を行う。
【０００３】
これにより、管理者は、水質を監視しながら、薬品の注入率を決定し、必要な量の薬品を適宜、注入することができる。薬品の注入を行うために、図１１に示すような流量Ｑを目標流量Ｑｒに自動的に制御する弁制御が行われている。
【０００４】
弁Ｖ４には、弁制御部１０が設けられている。弁制御部１０内にはＰＩ制御演算部１２と弁Ｖ４を駆動する駆動制御部１１が組み込まれている。弁制御部１０は、流量計５で検出された注入管３の流量Ｑが目標流量Ｑｒになるように弁Ｖ４の開度ＵをＰＩ制御演算部１２によって自動制御する。
【０００５】
このように構成された図１１に示す弁制御装置１０の動作を図１２に示すグラフで説明する。目標流量Ｑｒを時間０秒において３０ｍ³／ｈから６０ｍ³／ｈへ変更した場合に、その後の流量Ｑの変化を示している。流量ＱがＰＩ制御によって目標流量に制御されていることがわかる。この場合、約５０秒後に目標流量に達する。
【０００６】
【発明が解決しようとする課題】
しかしながら、図１３に示すように薬品注入地点が複数存在する場合、注入管を途中で分岐させて薬品を注入する必要がある。このとき薬品注入点１０２，１０３における水量が異なる場合、それぞれ注入すべき薬品の量を変えなければならない。これは振り分け弁ＶＡ１０６、ＶＢ１０７を操作することによって実施できる。
【０００７】
ところが、このように複数に分岐した管路の場合、どれか１つの弁を操作すると、他の全ての管の流量が変動してしまう。つまり、単に注入地点の振り分け量を変更しようとして振り分け弁を操作すると、全体の流量Ｑまでもが変動してしまい、結果として正しい振り分けを行うことができない。
【０００８】
また、振り分け弁ＶＡ１０６、ＶＢ１０７によって１：２の流量比で振り分けを行っている最中に流量Ｑを２倍に変更した場合、それぞれの弁に特性があるので１：２の流量比に保たれない。このように、流量の異なる複数の薬品注入地点において、与えられた薬品注入率を一定に保つことは、それぞれの弁の操作が流量の変動要因となるため適正な制御を行うことができなかった。
【０００９】
そこで本発明の目的は、上記従来技術の有する問題を解消し、複数に分岐した管路の流量をそれぞれの管路に設置した振り分け弁を操作して振り分け、流入側の弁により振り分け弁うぃ操作することにより生じる流体流入部に流入する流体の流入量の変動を抑制することにより、必要な流入流量を分岐先に適切に振り分けることを可能にする振り分け弁制御装置を提供することである。
【００１０】
【課題を解決するための手段】
上記課題を解決するために、本願の第１の発明は、加圧された流体流入部に設置された第１の弁と前記流体流入部から流体が流入する複数の分岐した低圧の流体流出部の各々に設置された複数の第２の弁の各々の弁を制御する振り分け弁制御装置において、前記流体流入部に流入する流体の第１流入量と前記第１の弁の第１弁開度を検出する第１物理量検出部と、前記第１物理量検出部で検出される第１流入量が所定の第１目標流量となるように前記第１弁開度を操作するための第１操作量を演算する第１制御演算部と、前記第１制御演算部で演算した前記第１操作量に基づいて前記第１の弁を駆動する第１弁駆動制御部と、複数の前記流体流出部に流入する流体の各々の第２流入量と複数の前記第２の弁の各々の第２弁開度を検出する第２物理量検出部と、前記第２物理量検出部で検出される各々の前記第２流入量が所定の各々の第２目標流量となるように各々の前記第２弁開度を操作するための各々の第２操作量を演算する第２制御演算部と、前記第２制御演算部で演算した複数の前記第２操作量の大きさを互いに比較し、複数の前記第２の弁のうちの操作を実行する操作弁を判定する操作弁判定部と、前記操作弁判定部で判定した前記操作弁に対応する前記第２操作量に基づいて前記第２の弁を駆動する第２弁駆動制御部と、を備え、前記第２操作量が正の値をとることは対応する前記第２の弁の前記第２弁開度がより開く方向に操作されることを示す場合において、前記操作弁判定部は、複数の前記第２操作量の中の最大値が正の値であるか否かを判定し、前記最大値が正の値である場合に前記最大値をとる前記第２の弁を前記操作弁として判定し、前記最大値が正の値でない場合に複数の前記第２操作量の中の最小値をとる前記第の２弁を前記操作弁として判定することを特徴とする。
【００１１】
第１の発明において、第１制御演算部によって第１物理量検出部で検出される第１流入量が所定の第１目標流量となるように第１弁開度を操作するための第１操作量を演算し、第１弁駆動制御部によって第１制御演算部で演算した第１操作量に基づいて第１の弁を駆動する。一方、第２制御演算部によって第２物理量検出部で検出される第２流入量が所定の第２目標流量となるように前記第１弁開度を操作するための第２操作量を演算し、操作弁判定部によって複数の第２の弁のうちの操作を実行する操作弁を判定し、第２弁駆動制御部によって操作弁判定部で判定した操作弁に対応する第２操作量に基づいて第２の弁を駆動する。
【００１２】
第１の弁と第２の弁とを個別に制御することが可能であるので、流体流入部に流入する流体の流量を第１目標流量に制御できるとともに、複数の分岐した流体流出部の各々に流入する流体の流量を各々の第２目標流量に制御することが可能になる。
また、操作弁判定部は、複数の第２の弁のうち、最も操作効果の大きいものを操作弁として判定する。操作弁判定部は第２操作量の最大値が正であるか否かを調べて操作弁を判定し、第２の弁の開度を開き側を主体として制御するようにしたことにより、必要な流量を確保し、かつ安定した制御応答をもって振り分けることができる。
【００１３】
本願の第２の発明は、加圧された流体流入部から流体が流入する複数の分岐した低圧の流体流出部の各々に設置された複数の第２の弁の各々の弁を制御する振り分け弁制御装置において、複数の前記流体流出部に流入する流体の各々の第２流入量と複数の前記第２の弁の各々の第２弁開度を検出する第２物理量検出部と、前記第２物理量検出部で検出される各々の前記第２流入量が所定の各々の第２目標流量となるように各々の前記第２弁開度を操作するための各々の第２操作量を演算する第２制御演算部と、前記第２制御演算部で演算した複数の前記第２操作量の大きさを互いに比較し、複数の前記第２の弁のうちの操作を実行する操作弁を判定する操作弁判定部と、前記操作弁判定部で判定した前記操作弁に対応する前記第２操作量に基づいて前記第２の弁を駆動する第２弁駆動制御部と、を備え、前記第２操作量が正の値をとることは対応する前記第２の弁の前記第２弁開度がより開く方向に操作されることを示す場合において、前記操作弁判定部は、複数の前記第２操作量の中の最大値が正の値であるか否かを判定し、前記最大値が正の値である場合に前記最大値をとる前記第２の弁を前記操作弁として判定し、前記最大値が正の値でない場合に複数の前記第２操作量の中の最小値をとる前記第の２弁を前記操作弁として判定することを特徴とする。
【００１４】
第２の発明において、第２制御演算部によって第２物理量検出部で検出される第２流入量が所定の第２目標流量となるように前記第１弁開度を操作するための第２操作量を演算し、操作弁判定部によって複数の第２の弁のうちの操作を実行する操作弁を判定し、第２弁駆動制御部によって操作弁判定部で判定した操作弁に対応する第２操作量に基づいて第２の弁を駆動する。流体流入部へ流入する流体の流量の変動が大きく生じない場合や流体流入部へ流入する流体の流量の変動が生じても支障がない場合には、第１の弁を個別に制御することなく第２の弁を制御することで十分である。
また、操作弁判定部は、複数の第２の弁のうち、最も操作効果の大きいものを操作弁として判定する。操作弁判定部は第２操作量の最大値が正であるか否かを調べて操作弁を判定し、第２の弁の開度を開き側を主体として制御するようにしたことにより、必要な流量を確保し、かつ安定した制御応答をもって振り分けることができる。
【００１５】
本願の第３の発明は、前記第２物理量検出部で検出される各々の前記第２流入量に応じて、複数の前記流体流出部に流入する流体の各々の前記第２目標流量を設定する目標流量演算部をさらに備えることを特徴とする。
【００１６】
第３の発明において、目標流量演算部によって、第２物理量検出部で検出される各々の第２流入量に応じて各々の第２目標流量を設定することができる。
【００１９】
【発明の実施の形態】
以下、図面を参照して本発明の好適な実施の形態について説明する。
【００２０】
図１に、本発明の振り分け弁制御装置の一実施の形態の概略構成を示す。図１に示す振り分け弁制御装置は、ポンプ１で加圧された流体流入部５１とその流路３に設置された流入弁４の開度を調節することによって流体流入部５１からの流入量Ｑを目標流量Ｑｒに制御し、流体流入部５１の下流側で２カ所以上の低圧の流体流出部５２ａ、５２ｂに設置された弁２３ａ、２３ｂの開度を調節することによって、流体流出部５２ａ、５２ｂへの流出量ＱＡ、ＱＢを目標流量ＱＡｒ、ＱＢｒに制御するものである。
【００２１】
図１に振り分け弁制御装置は弁制御装置１１５、１１６を備えている。
【００２２】
弁制御装置１１５は、弁Ｖ４を駆動する弁駆動制御部１１０と、流体流入部５１に流入する流体の流入量Ｑと弁Ｖ４の開度Ｕを検出する物理量検出部１０８と、物理量検出部１０８にて検出された流入量が流体流入部５１の所定の目標流量Ｑｒになるように弁駆動制御部１１０への操作量△Ｕを送出する制御演算部１１２を備えている。
【００２３】
弁制御装置１１６は、流体流出部５２ａ、５２ｂに設置された流出弁ＶＡ２３ａ、ＶＢ２３ｂを駆動する弁駆動制御部１１１と、流体流入部５１から流体流出部５２ａ、５２ｂへ流出する流体の流出量ＱＡ、ＱＢと各弁ＶＡ２３ａ、ＶＢ２３ｂの開度ＵＡ、ＵＢを検出する物理量検出部１０９と、物理量検出部１０９にて検出された各々の流出量が流体流出部５２、５３の各々への目標流量ＱＡｒ、ＱＢｒになるように弁駆動制御部１１への操作量△ＵＡ、△ＵＢを演算する制御演算部１１３と、制御演算部１１３による演算結果から操作すべき操作弁を判定する操作弁判定部１１４とを備えている。
【００２４】
操作弁判定部１１４は、制御演算部１１３によって求められた弁操作量△ＵＡ、△ＵＢの最大値が正の場合、その弁を操作対象弁（操作弁）とし、弁操作量△ＵＡ、△ＵＢの最大値が正でない場合、操作量△ＵＡ、△ＵＢの最小値を求め、その弁を操作対象弁（操作弁）とする。
【００２５】
図１に示す振り分け弁制御装置においては、ポンプ１によって加圧された流体流入部５１から低圧の流体流出部５２ａ，５２ｂへ至る流路３には、弁Ｖ４、振り分け弁ＶＡ２３ａ、ＶＢ２３ｂが設置され、各弁の開度Ｕ、ＵＡ、ＵＢは物理検出部１０８，１０９にて検出される。また、各弁Ｖ４、ＶＡ２３ａ、ＶＢ２３ｂは、弁駆動制御部１１０、１１１にて駆動制御される。そして、制御演算部１１２は、物理検出部１０８にて検出された流量Ｑ（流入量）が目標流量Ｑｒになるように弁駆動制御部１１０へ操作量△Ｕを送出する。
【００２６】
制御演算部１１３は、物理検出部１０９にて検出された流量ＱＡ、ＱＢが目標流量ＱＡｒ、ＱＢｒになるように弁駆動制御部１１０へ操作量△ＵＡ、△ＵＢを送出する。ただし、操作弁判定部１１４は、弁開度ＵＡ、ＵＢ、操作量△ＵＡ、△ＵＢを用いて操作すべき振り分け弁を決定する。
【００２７】
例えば、振り分け弁による振り分け流量比ＱＡ：ＱＢを１：１から１：２に変更しようとした場合、振り分け弁ＶＡ２３ａによる目標流量ＱＡｒは減少、振り分け弁ＶＢ２３ｂによる目標流量ＱＢｒは、増加となるよう弁を操作しなければならない。しかし、どちらか一方の弁を操作すると、他方にもその影響が現れるので、適切に操作すべき弁を判定し、振り分け弁を操作するようにする。また、振り分け弁ＶＡ２３ａまたは振り分け弁ＶＢ２３ｂを操作すると、同時に、流入流量Ｑも変動してしまい、振り分け弁による目標流出流量であるＱＡｒ、ＱＢｒを満たすことができなくなる恐れがある。ところが、本発明によれば、弁Ｖ４は、目標流量Ｑｒを満たすように制御されるので、最終的に振り分け弁による目標流出流量ＱＡｒ、ＱＢｒを満たす制御が可能となる。
【００２８】
図２は、図１に示す振り分け弁制御装置をさらに説明するための概略構成図である。図２に示す振り分け弁制御装置においては、ポンプによって加圧された流体流入部５１と分岐した流出部５２ａ、５２ｂの間は管路３で接続されている。また、流入部５１には、弁Ｖ４と流入する水の単位時間当たりの流入量Ｑを検出する流量計５が設置されている。流出部５２ａ、５２ｂには、振り分け弁ＶＡ２３ａ、ＶＢ２３ｂと振り分け後の流出する水の単位時間当たりの流出量ＱＡ、ＱＢを検出する流量計２４ａ、２４ｂが設置されている。流量計２４ａ、２４ｂは、物理量検出部１０９を構成する。
【００２９】
弁Ｖ４には弁制御装置１１５を構成する弁制御部１０が接続され、振り分け弁ＶＡ２３ａには弁制御措置１１６を構成する弁制御部２０ａが接続され、振り分け弁ＶＢ２３ｂには弁制御装置１１６を構成する弁制御部１１６ｂが接続されている。弁制御部１０内には、ＰＩ制御演算部１２と弁Ｖ４を駆動する駆動制御部１１が組み込まれ、弁制御部２０ａ、２０ｂ内には、ＰＩ制御演算部２２ａ、２２ｂと各振り分け弁ＶＡ２３ａ、ＶＢ２３ｂを駆動する駆動制御部２１ａ、２１ｂとが組み込まれている。
【００３０】
なお、実施例のＰＩ制御演算部２２ａ、２２ｂには、各振り分け弁ＶＡ２３ａ、ＶＢ２３ｂの実際の開度ＵＡ、ＵＢに応じてゲインが変化するゲイン・スケジューリング式ＰＩ制御演算部２２ａ、２２ｂが採用されている。このようなゲイン・スケジューリング式ＰＩ制御演算部を用いることによって弁開度−弁抵抗特性の非線形特性が補正される。
【００３１】
そして、ＰＩ制御演算部１２は、流量計５で検出された流入量Ｑが目標流量ＱｒになるようにＰＩ制御演算を実行して、弁に対する操作量△Ｕを駆動制御部１１へ送出する。
【００３２】
また、ＰＩ制御演算部２２ａは、流量計２４ａで検出された流出量ＱＡが目標流量ＱＡｒになるようにＰＩ制御演算を実行して、振り分け弁ＶＡ２３ａに対する操作量△ＵＡを駆動制御部２１ａへ送出する。同様にＰＩ制御演算部２２ｂは、流量計２４ｂで検出された流出量ＱＢが目標流量ＱＢｒになるようにＰＩ制御演算を実行して、振り分け弁ＶＢ２３ｂに対する操作量△ＵＢを駆動制御部２１ｂへ送出する。
【００３３】
また、操作弁判定部１１４は、各振り分け弁ＶＡ２３ａ、ＶＢ２３ｂの操作量△ＵＡ、△ＵＢ、開度ＵＡ、ＵＢから操作すべき振り分け弁を決定する。したがって、複数の干渉関係にある弁の中で、ここで決定した振り分け弁のみが操作される。
【００３４】
以上説明したように目標流出流量ＱＡｒ、ＱＢｒが変化した場合に、振り分け弁ＶＡ２３ａ、ＶＢ２３ｂの開度を操作することによって、流出流量を目標に近づけることができる。
【００３５】
また、振り分け弁開度ＶＡ２３ａ、ＶＢ２３ｂを操作することによって生じる流入流量Ｑの増減は、弁Ｖ４の開度を操作することによって、流入流量を目標に近づけることができる。
【００３６】
したがって、１つの管路が途中で複数に分岐し、分岐した管路の流量を弁によって振り分ける振り分け弁制御において、安定した制御応答を得ることができる
【００３７】
図３は、図２に示す装置において目標流入流量Ｑｒを変更した場合の制御応答を示すグラフである。目標流入流量Ｑｒを１００秒に３０ｍ³／ｈから６０ｍ³／ｈに変更している。振り分け弁開度ＵＡ、ＵＢは流入流量の変動に応じながら、振り分け流量比を８：７に保つように、弁開度ＵＡ、ＵＢを変更することによって、安定した制御が実現されている。
【００３８】
図４は、図２に示す装置において、目標流出流量ＱＡｒ、ＱＢｒを変更した場合の制御応答を示すグラフである。目標流出流量ＱＡｒを５０秒に３０ｍ³／ｈから２８ｍ³／ｈ、６５０秒に２５．７ｍ³／ｈに変更している。振り分け弁開度ＵＡ、ＵＢを変更し、かつ流入流量の変更に対し、弁開度Ｕを変更することによって、安定した制御が実現されている。
【００３９】
また、本実施の形態では、弁Ｖ４を制御するためにＰＩ方式の制御演算部１２を採用し、振り分け弁ＶＡ２３ａ、ＶＢ２３ｂを制御するためにゲインスケジューリング式ＰＩ方式の制御演算部２２ａ、２２ｂを採用したが、それぞれＰＩＤ方式、ゲインスケジューリング式PI方式、Ｉ−ＰＤ方式、２自由度ＰＩＤ方式の制御演算部を採用してもよい。
【００４０】
図８は、図２に示す装置における操作弁判定部１１４のフローチャートを表している。
【００４１】
操作弁判定処理部２５は、各振り分け弁ＶＡ２３ａ、ＶＢ２３ｂ…Ｖｎ２３ｎの操作量△ＵＡ、△ＵＢ…△Ｕｎを受け取り、フローチャートに示す処理により操作すべき振り分け弁を決定する。
【００４２】
そのためにまず、操作量の最大値△ＵＭＡＸを求める（２００１）。次に、求められた操作量△ＵＭＡＸが正の場合（開方向動作）か否かを判断し（２００２）、△ＵＭＡＸが正の場合には、操作量が△ＵＭＡＸとなる弁を操作対象とする（２００３）。求められた操作量△ＵＭＡＸが負の場合（閉方向動作）（２００２）には、操作量の最小値△ＵＭＩＮを求め（２００４）、操作量が△ＵＭＩＮとなる弁を操作対象とする（２００５）。求められた分以外は、操作対象としない。
【００４３】
さらに、本実施の形態では流出部が２カ所である場合を示したが、３カ所以上の流出部を持つ場合にも同様に対処することができる。
【００４４】
図５は、分岐先が３カ所以上の流体流出部５２ａ、５２ｂ・・５２ｎである場合の概略構成図である。この場合も同様に振り分け制御を行うことができる。
【００４５】
図６は、他の実施の形態を示す概略構成図である。加圧された流体流入部が高台の池１０１によって代用される場合を示し、注入機が無い場合を示している。この場合も同様に振り分け制御を行うことができる。
【００４６】
図７は、さらに他の実施の形態を示す振り分け弁制御装置を示す概略構成図である。図７に示す装置は、低圧の流体流出部の流量計２０１、２０２と各低圧流体流出部の流量からそれぞれの流出部５２ａ、５２ｂに振り分けるべき流量目標値ＱＡｒ、ＱＢｒを計算する目標流量演算部２０３を備えている。
【００４７】
図７に示す装置によると、流体流出部５２ａ、５２ｂの流量に応じて、自動的に振り分け流量目標値ＱＡｒ、ＱＢｒを決定することができる。
【００４８】
図９は、さらに他の実施の形態を示す振り分け弁制御装置を示す概略構成図である。図９に示す装置は、図２に示す弁Ｖ４、弁制御装置１１５を備えていない振り分け弁制御装置である。この装置では、振り分け弁２３ａ，２３ｂの操作により流体流入部５１の流入流量Ｑに変動が発生してしまうが、振り分け弁２３ａ，２３ｂによる流入流量変動が少ない場合、あるいは、振り分け弁２３ａ，２３ｂによる流入流量変動が多少あってもプラントに支障をきたさない場合に、有効である。この場合、振り分け弁制御装置の装置構成を簡単にすることができる。
【００４９】
以上説明したように、本発明の実施の形態によれば、分岐した管路の流量をそれぞれの管路に設置した振り分け弁２３ａ，２３ｂを操作して振り分け、振り分け弁２３ａ，２３ｂを操作することによる流体流入部５１の流入流量Ｑの変動を流入側の弁Ｖ４により抑制することにより、必要な流入流量Ｑを分岐先２ａ，２ｂに適切に振り分けることができる。
【００５０】
また、弁Ｖ４とVＡ２３ａ、ＶＢ２３ｂ…Ｖｎ２３ｎとの制御を独立して行え、プロセス上は干渉し合うＶ４とＶＡ２３ａ、ＶＢ２３ｂ…Ｖｎ２３ｎとが独立に制御でき、調整を容易に行うことができる。
【００５１】
また、目標流量演算部２０３を備えているので、流量目標値ＱＡｒ、ＱＢｒを自動で決定し流出先２ａ，２ｂの流量に応じて、必要な流入流量Ｑを分岐先に振り分けることができる。
【００５２】
また、操作弁判定部１１４は各振り分け弁ＶＡ２３ａ、ＶＢ２３ｂの操作量△ＵＡ、△ＵＢの最大値が正であるか否かを調べて操作弁を判定し、振り分け弁VＡ２３ａ、ＶＢ２３ｂ…Ｖｎ２３ｎの開度を開き側を主体として制御するようにしたことにより、必要な流量を確保し、かつ安定した制御応答をもって振り分けることができる。
【００５３】
また、振り分け弁VＡ２３ａ、ＶＢ２３ｂ…Ｖｎ２３ｎの開度変更による流入量変動が問題にならない場合には、振り分け弁VＡ２３ａ、ＶＢ２３ｂ…Ｖｎ２３ｎの制御のみで、流入流量Ｑを分岐先２ａ，２ｂに適切に振り分けることができる。
【００５４】
【発明の効果】
以上説明したように、本発明の構成によれば、流体流入部を流れる流体の流量を適切に制御可能であるとともに、流体流出部から流出した流体を複数の分岐した流体流出部に流量を適切に振り分けることができる。
【図面の簡単な説明】
【図１】本発明の振り分け弁制御装置の一実施形態を示す概略構成図。
【図２】図１に示す装置を説明する概略構成図。
【図３】図１及び図２に示す装置の一動作特性図。
【図４】図１及び図２に示す装置の他の動作特性図。
【図５】本発明の振り分け弁制御装置の他の実施形態を示す概略構成図。
【図６】本発明の振り分け弁制御装置の他の実施形態を示す概略構成図。
【図７】本発明の振り分け弁制御装置の他の実施形態を示す概略構成図。
【図８】本発明の振り分け弁制御装置の操作弁判定部の動作を示す流れ図。
【図９】本発明の振り分け弁制御装置の他の実施形態を示す概略構成図。
【図１０】一般的な上水道プラントを示す模式図。
【図１１】従来の流入・流出弁制御装置を示す概略構成図。
【図１２】同従来装置の動作特性図。
【図１３】振り分け弁制御装置の構成を示す概念図。
【符号の説明】
１ポンプ
２３ａ、２３ｂ…２３ｎ振り分け弁
２４ａ、２４ｂ…２４ｎ流量計
１０８、１０９物理検出部
１１０、１１１弁駆動制御部
１１２、１１３制御演算部
１１４操作弁判定部
１１５、１１６弁制御装置
２０１、２０２流量計
２０３目標流量演算部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a distribution valve control device, and is provided at a first valve installed at a pressurized fluid inflow portion and at each of a plurality of branched low-pressure fluid outflow portions into which fluid flows from the fluid inflow portion. And a distribution valve control device that controls each of the plurality of second valves.
[0002]
[Prior art]
For example, in a waterworks plant, as shown in FIG. 10, a chemical is injected from a chemical injector 6 to an injection point 2 via an injection pipe 3. At this time, the pressure required for performing injection is given to the chemical injection machine 6 by the pressurizing pump 1. The chemical injection rate at injection point 2 must be kept constant. Therefore, the chemical concentration must be changed according to the change in the flow rate at the injection point 2. When the chemical concentration is changed, the flow rate Q is temporarily increased or decreased by the rehydration valve V4 in order to avoid an injection delay caused by the injection pipe length.
[0003]
Accordingly, the administrator can determine the injection rate of the chemical while monitoring the water quality, and can appropriately inject the required amount of the chemical. In order to inject the chemical, valve control for automatically controlling the flow rate Q to the target flow rate Qr as shown in FIG. 11 is performed.
[0004]
A valve control unit 10 is provided for the valve V4. The valve control unit 10 incorporates a PI control calculation unit 12 and a drive control unit 11 that drives the valve V4. The valve control unit 10 automatically controls the opening degree U of the valve V4 by the PI control calculation unit 12 so that the flow rate Q of the injection pipe 3 detected by the flow meter 5 becomes the target flow rate Qr.
[0005]
The operation of the thus configured valve control device 10 shown in FIG. 11 will be described with reference to a graph shown in FIG. When changing to 60 m ³ / h from 30 m ³ / h at a target flow rate Qr time 0 seconds, shows the change in the subsequent flow Q. It can be seen that the flow rate Q is controlled to the target flow rate by PI control. In this case, the target flow rate is reached after about 50 seconds.
[0006]
[Problems to be solved by the invention]
However, when there are a plurality of drug injection points as shown in FIG. 13, it is necessary to split the injection pipe midway and inject the drug. At this time, if the amounts of water at the chemical injection points 102 and 103 are different, the amount of the chemical to be injected must be changed. This can be performed by operating the distribution valves VA106 and VB107.
[0007]
However, in the case of such a branched pipeline, operating any one of the valves causes the flow rates of all other pipelines to fluctuate. That is, if the distribution valve is operated simply to change the distribution amount of the injection point, even the entire flow rate Q fluctuates, and as a result, correct distribution cannot be performed.
[0008]
Further, when the flow rate Q is changed to twice while the distribution valves VA106 and VB107 perform distribution at a flow ratio of 1: 2, the flow ratio is maintained at 1: 2 because each valve has characteristics. Absent. As described above, at a plurality of chemical injection points having different flow rates, maintaining the given chemical injection rate constant could not perform appropriate control because the operation of each valve would cause a variation in the flow rate. .
[0009]
Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to distribute the flow rate of a plurality of branched pipelines by operating a distribution valve installed in each pipeline, and to distribute the flow by a valve on the inflow side. An object of the present invention is to provide a distribution valve control device capable of appropriately distributing a required inflow flow rate to a branch destination by suppressing a change in an inflow amount of a fluid flowing into a fluid inflow section caused by the above operation.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a first invention of the present application is directed to a first valve installed in a pressurized fluid inflow portion and a plurality of branched low-pressure fluid outflow portions into which fluid flows from the fluid inflow portion. In the distribution valve control device that controls each of the plurality of second valves installed in each of the first and second valves, the first inflow amount of the fluid flowing into the fluid inflow portion and the first valve opening degree of the first valve And a first operation amount for operating the first valve opening degree such that the first inflow amount detected by the first physical amount detection unit becomes a predetermined first target flow rate. And a first valve drive control unit that drives the first valve based on the first operation amount calculated by the first control calculation unit; and a plurality of the fluid outflow units. A second valve for detecting a second inflow amount of each of the flowing fluids and a second valve opening of each of the plurality of second valves; Each for controlling the second valve opening degree such that each of the second inflows detected by the second physical quantity detection section becomes a predetermined second target flow rate. A second control operation unit that calculates the second operation amount of the second control operation unit, and compares the magnitudes of the plurality of second operation amounts calculated by the second control operation unit with each other to determine the operation of the plurality of second valves. And a second valve drive control unit that drives the second valve based on the second operation amount corresponding to the operation valve determined by the operation valve determination unit. The operation valve determination is performed in a case where the second operation amount has a positive value, indicating that the second valve opening degree of the corresponding second valve is operated in a direction to open more. The unit determines whether a maximum value among the plurality of second operation amounts is a positive value, and determines that the maximum value is positive. When the value is a value, the second valve that takes the maximum value is determined as the operation valve, and when the maximum value is not a positive value, the second valve that takes the minimum value among the plurality of second operation amounts is determined. Two valves are determined as the operation valves .
[0011]
In the first invention, a first operation amount for operating the first valve opening such that the first inflow amount detected by the first physical quantity detection unit by the first control calculation unit becomes a predetermined first target flow rate. Is calculated, and the first valve is driven by the first valve drive control unit based on the first operation amount calculated by the first control calculation unit. On the other hand, a second operation amount for operating the first valve opening degree is calculated by the second control operation unit so that the second inflow amount detected by the second physical amount detection unit becomes a predetermined second target flow rate. An operating valve for performing an operation of the plurality of second valves is determined by the operating valve determining unit, and based on the second operation amount corresponding to the operating valve determined by the operating valve determining unit by the second valve drive control unit. To drive the second valve.
[0012]
Since the first valve and the second valve can be individually controlled, the flow rate of the fluid flowing into the fluid inflow section can be controlled to the first target flow rate, and each of the plurality of branched fluid outflow sections can be controlled. Can be controlled to the respective second target flow rates.
Further, the operation valve determination unit determines, as the operation valve, a valve having the largest operation effect among the plurality of second valves. The operation valve determination unit determines whether the maximum value of the second operation amount is positive, determines the operation valve, and controls the opening degree of the second valve mainly on the opening side, which is necessary. A flow rate can be secured and the distribution can be performed with a stable control response.
[0013]
According to a second aspect of the present invention, there is provided a distribution valve for controlling each of a plurality of second valves installed at each of a plurality of branched low-pressure fluid outlets into which fluid flows from a pressurized fluid inlet. In the control device, a second physical quantity detection unit that detects a second inflow amount of each of the fluids flowing into the plurality of fluid outflow units and a second valve opening degree of each of the plurality of second valves; A second operation amount for calculating each second operation amount for operating each second valve opening degree such that each of the second inflow amounts detected by the physical amount detection unit becomes a predetermined second target flow rate; (2) an operation of comparing the magnitudes of the plurality of second manipulated variables calculated by the second control computation unit with each other and determining an operation valve to execute an operation of the plurality of second valves; A valve determination unit and a second operation amount corresponding to the operation valve determined by the operation valve determination unit. And a second valve drive control unit that drives the second valve, wherein when the second manipulated variable takes a positive value, the second valve opening of the corresponding second valve is further opened. When indicating that the operation is performed in the direction, the operation valve determination unit determines whether a maximum value among the plurality of second operation amounts is a positive value, and the maximum value is a positive value. If the maximum value is not a positive value, the second valve that takes the maximum value is determined as the operation valve, and if the maximum value is not a positive value, the second valve takes the minimum value among the plurality of second operation amounts. A valve is determined as the operating valve .
[0014]
In the second invention, a second operation for operating the first valve opening degree such that a second inflow amount detected by a second physical quantity detection unit by a second control calculation unit becomes a predetermined second target flow rate. The amount is calculated, the operating valve determining unit determines the operating valve that performs the operation of the plurality of second valves, and the second valve drive control unit determines the second operating valve corresponding to the operating valve determined by the operating valve determining unit. The second valve is driven based on the operation amount. If the flow rate of the fluid flowing into the fluid inflow section does not greatly fluctuate, or if the flow rate of the fluid flowing into the fluid inflow section does not interfere, the first valves are not individually controlled. It is sufficient to control the second valve.
Further, the operation valve determination unit determines, as the operation valve, a valve having the largest operation effect among the plurality of second valves. The operation valve determination unit determines whether the maximum value of the second operation amount is positive, determines the operation valve, and controls the opening degree of the second valve mainly on the opening side, which is necessary. A flow rate can be secured and the distribution can be performed with a stable control response.
[0015]
In a third aspect of the present invention, the second target flow rate of each of the fluids flowing into the plurality of fluid outlets is set in accordance with each of the second inflows detected by the second physical quantity detector. It is characterized by further comprising a target flow rate calculation unit.
[0016]
In the third invention, each of the second target flow rates can be set by the target flow rate calculation section in accordance with each of the second inflow rates detected by the second physical quantity detection section.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 shows a schematic configuration of a distribution valve control device according to an embodiment of the present invention. The distribution valve control device shown in FIG. 1 adjusts the opening degree of the fluid inflow section 51 pressurized by the pump 1 and the inflow valve 4 provided in the flow path 3 thereof, thereby controlling the inflow amount Q from the fluid inflow section 51. Is controlled to the target flow rate Qr, and by adjusting the opening degrees of the valves 23a and 23b installed in two or more low-pressure fluid outlets 52a and 52b downstream of the fluid inlet 51, the fluid outlet 52a, The outflow amounts QA and QB to 52b are controlled to target flow rates QAr and QBr.
[0021]
In FIG. 1, the distribution valve control device includes valve control devices 115 and 116.
[0022]
The valve control device 115 includes a valve drive control unit 110 that drives the valve V4, a physical quantity detection unit 108 that detects the inflow amount Q of the fluid flowing into the fluid inflow unit 51 and the opening degree U of the valve V4, and a physical quantity detection unit 108. Is provided with a control operation unit 112 that sends out the operation amount △ U to the valve drive control unit 110 so that the inflow amount detected by the above becomes the predetermined target flow amount Qr of the fluid inflow unit 51.
[0023]
The valve control device 116 includes a valve drive control unit 111 that drives the outflow valves VA23a and VB23b installed in the fluid outflow units 52a and 52b, and an outflow amount QA of the fluid that flows from the fluid inflow unit 51 to the fluid outflow units 52a and 52b. , QB and the physical quantity detection unit 109 for detecting the opening degrees UA, UB of the valves VA23a, VB23b, and the respective outflow amounts detected by the physical quantity detection unit 109 are the target flow rates QAr to the fluid outflow units 52, 53, respectively. , UA and UB to the valve drive control unit 11, and an operation valve determination unit 114 that determines an operation valve to be operated based on the calculation result by the control operation unit 113. And
[0024]
When the maximum values of the valve operation amounts △ UA and △ UB obtained by the control operation unit 113 are positive, the operation valve determination unit 114 sets the valve as an operation target valve (operation valve) and sets the valve operation amount △ UA, △ When the maximum value of UB is not positive, the minimum values of the manipulated variables △ UA and △ UB are obtained, and the valves are set as the valves to be operated (operated valves).
[0025]
In the distribution valve control device shown in FIG. 1, a valve V4 and distribution valves VA23a and VB23b are provided in a flow path 3 from a fluid inlet 51 pressurized by a pump 1 to low-pressure fluid outlets 52a and 52b. The opening degrees U, UA, and UB of each valve are detected by the physical detection units 108 and 109. The valves V4, VA23a, and VB23b are driven and controlled by valve drive controllers 110 and 111. Then, the control calculation unit 112 sends the operation amount ΔU to the valve drive control unit 110 so that the flow rate Q (inflow amount) detected by the physical detection unit 108 becomes the target flow rate Qr.
[0026]
The control calculation unit 113 sends the manipulated variables △ UA, △ UB to the valve drive control unit 110 such that the flow rates QA, QB detected by the physical detection unit 109 become the target flow rates QAr, QBr. However, the operation valve determination unit 114 determines a distribution valve to be operated using the valve openings UA and UB and the operation amounts △ UA and △ UB.
[0027]
For example, when the distribution flow ratio QA: QB by the distribution valve is to be changed from 1: 1 to 1: 2, the target flow QAr by the distribution valve VA23a decreases and the target flow QBr by the distribution valve VB23b increases. Must be operated. However, when one of the valves is operated, the influence is exerted on the other valve. Therefore, the valve to be operated is determined appropriately, and the distribution valve is operated. Further, when the distribution valve VA23a or the distribution valve VB23b is operated, the inflow flow rate Q also fluctuates, and there is a possibility that the target outflow flow rates QAr and QBr by the distribution valve cannot be satisfied. However, according to the present invention, since the valve V4 is controlled so as to satisfy the target flow rate Qr, it becomes possible to finally control the target outflow flow rates QAr and QBr by the distribution valve.
[0028]
FIG. 2 is a schematic configuration diagram for further explaining the distribution valve control device shown in FIG. In the distribution valve control device shown in FIG. 2, a line 3 is connected between a fluid inflow portion 51 pressurized by a pump and branching outflow portions 52 a and 52 b. Further, the inflow section 51 is provided with a flowmeter 5 for detecting the inflow amount Q per unit time of water flowing into the valve V4. Distributing valves VA23a and VB23b and flow meters 24a and 24b for detecting the outflow amounts QA and QB per unit time of the outflowing water after distribution are installed in the outflow portions 52a and 52b. The flow meters 24a and 24b constitute a physical quantity detection unit 109.
[0029]
The valve control unit 10 constituting the valve control unit 115 is connected to the valve V4, the valve control unit 20a constituting the valve control unit 116 is connected to the distribution valve VA23a, and the valve control unit 116 is composed to the distribution valve VB23b. The valve control unit 116b is connected. In the valve control unit 10, a PI control calculation unit 12 and a drive control unit 11 for driving the valve V4 are incorporated, and in the valve control units 20a and 20b, PI control calculation units 22a and 22b and each distribution valve VA23a, Drive controllers 21a and 21b for driving the VB 23b are incorporated.
[0030]
Note that the PI control calculation units 22a and 22b of the embodiment employ gain-scheduled PI control calculation units 22a and 22b in which the gain changes according to the actual opening UA and UB of each of the distribution valves VA23a and VB23b. ing. By using such a gain-scheduling PI control calculation unit, the non-linear characteristic of the valve opening-valve resistance characteristic is corrected.
[0031]
Then, the PI control calculation unit 12 executes the PI control calculation so that the inflow amount Q detected by the flow meter 5 becomes the target flow rate Qr, and sends the operation amount △ U for the valve to the drive control unit 11.
[0032]
Further, the PI control calculation unit 22a executes the PI control calculation so that the outflow amount QA detected by the flow meter 24a becomes the target flow rate QAr, and sends the operation amount △ UA to the distribution valve VA23a to the drive control unit 21a. I do. Similarly, the PI control calculation unit 22b executes the PI control calculation so that the outflow amount QB detected by the flow meter 24b becomes the target flow amount QBr, and sends the operation amount △ UB to the distribution valve VB23b to the drive control unit 21b. I do.
[0033]
Further, the operation valve determination unit 114 determines a distribution valve to be operated based on the operation amounts △ UA, 、 UB and the opening degrees UA, UB of the respective distribution valves VA23a, VB23b. Therefore, among the valves having a plurality of interference relationships, only the distribution valve determined here is operated.
[0034]
As described above, when the target outflow flow rates QAr and QBr change, the outflow flow rate can be made closer to the target by operating the opening degrees of the distribution valves VA23a and VB23b.
[0035]
Further, the increase / decrease of the inflow flow rate Q caused by operating the distribution valve opening degrees VA23a and VB23b can be made to approach the target by operating the opening degree of the valve V4.
[0036]
Accordingly, a stable control response can be obtained in the distribution valve control in which one pipe is branched into a plurality of pipes on the way and the flow rate of the branched pipe is distributed by the valve.
FIG. 3 is a graph showing a control response when the target inflow flow rate Qr is changed in the apparatus shown in FIG. It has been changed to 60m ³ / h the target inflow flow rate Qr from 30m ³ / h to 100 seconds. Stable control is realized by changing the valve opening degrees UA and UB so that the distribution valve opening degrees UA and UB keep the distribution flow ratio at 8: 7 while varying the inflow flow rate.
[0038]
FIG. 4 is a graph showing a control response when the target outflow rates QAr and QBr are changed in the apparatus shown in FIG. The target outflow rate QAr to 50 seconds from 30 m ³ / h to 28m ³ / h, 650 seconds are changed to 25.7m ³ / h. By changing the distribution valve openings UA and UB and changing the valve opening U in response to a change in the inflow flow rate, stable control is realized.
[0039]
Further, in the present embodiment, the PI-based control calculation unit 12 is used to control the valve V4, and the gain scheduling PI-based control calculation units 22a and 22b are used to control the distribution valves VA23a and VB23b. However, a PID system, a gain scheduling PI system, an I-PD system, and a two-degree-of-freedom PID system control operation unit may be employed.
[0040]
FIG. 8 shows a flowchart of the operation valve determination unit 114 in the device shown in FIG.
[0041]
The operation valve determination processing unit 25 receives the operation amounts △ UA, △ UB... △ Un of the respective distribution valves VA23a, VB23b... Vn23n, and determines the distribution valve to be operated by the processing shown in the flowchart.
[0042]
For this purpose, first, a maximum value △ UMAX of the operation amount is obtained (2001). Next, it is determined whether or not the obtained operation amount △ UMAX is positive (opening operation) (2002). If △ UMAX is positive, a valve whose operation amount is △ UMAX is determined as an operation target. (2003). When the obtained operation amount △ UMAX is negative (closing direction operation) (2002), a minimum operation amount △ UMIN is obtained (2004), and a valve whose operation amount is △ UMIN is set as an operation target (2005). ). Except for the calculated amount, it is not set as the operation target.
[0043]
Furthermore, in the present embodiment, the case where the number of outflow portions is two has been described, but the case where there are three or more outflow portions can be similarly handled.
[0044]
FIG. 5 is a schematic configuration diagram in the case where the branch destinations are three or more fluid outlets 52a, 52b,. In this case, the distribution control can be performed similarly.
[0045]
FIG. 6 is a schematic configuration diagram showing another embodiment. The case where the pressurized fluid inflow portion is substituted by the pond 101 on the hill is shown, and the case where there is no injector is shown. In this case, the distribution control can be performed similarly.
[0046]
FIG. 7 is a schematic configuration diagram showing a distribution valve control device according to still another embodiment. The apparatus shown in FIG. 7 is a flow rate calculating section for calculating flow rate target values QAr, QBr to be distributed to the respective outflow sections 52a, 52b from the flow meters 201, 202 of the low pressure fluid outflow sections and the flow rates of the respective low pressure fluid outflow sections. 203 is provided.
[0047]
According to the device shown in FIG. 7, the distribution flow target values QAr and QBr can be automatically determined according to the flow rates of the fluid outflow portions 52a and 52b.
[0048]
FIG. 9 is a schematic configuration diagram illustrating a distribution valve control device according to still another embodiment. The device illustrated in FIG. 9 is a distribution valve control device that does not include the valve V4 and the valve control device 115 illustrated in FIG. In this device, the inflow flow rate Q of the fluid inflow section 51 fluctuates due to the operation of the distribution valves 23a and 23b. However, when the inflow flow rate fluctuation by the distribution valves 23a and 23b is small, or when the distribution valves 23a and 23b operate. This is effective when the fluctuation of the inflow flow rate does not hinder the plant. In this case, the configuration of the distribution valve control device can be simplified.
[0049]
As described above, according to the embodiment of the present invention, the flow rates of the branched pipelines are distributed by operating the distribution valves 23a and 23b installed in the respective pipelines, and the distribution valves 23a and 23b are operated. By suppressing the fluctuation of the inflow flow rate Q of the fluid inflow section 51 by the inflow side valve V4, the necessary inflow flow rate Q can be appropriately distributed to the branch destinations 2a and 2b.
[0050]
In addition, the valves V4 and VA23a, VB23b... Vn23n can be controlled independently, and V4 and VA23a, VB23b... Vn23n that interfere with each other in the process can be controlled independently, and adjustment can be easily performed.
[0051]
Further, since the target flow rate calculation unit 203 is provided, the flow rate target values QAr and QBr can be automatically determined, and the necessary inflow flow rate Q can be distributed to the branch destinations according to the flow rates of the outflow destinations 2a and 2b.
[0052]
The operation valve determination unit 114 determines whether the maximum value of the operation amount △ UA, △ UB of each of the distribution valves VA23a, VB23b is positive, determines the operation valve, and opens the distribution valves VA23a, VB23b,. By controlling the opening side mainly, the required flow rate can be secured and the distribution can be performed with a stable control response.
[0053]
If the change in the inflow amount due to the change in the opening degree of the distribution valves VA23a, VB23b,. be able to.
[0054]
【The invention's effect】
As described above, according to the configuration of the present invention, it is possible to appropriately control the flow rate of the fluid flowing through the fluid inflow section, and to adjust the flow rate of the fluid flowing out of the fluid outflow section to the plurality of branched fluid outflow sections. Can be sorted.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a distribution valve control device of the present invention.
FIG. 2 is a schematic configuration diagram illustrating the apparatus shown in FIG.
FIG. 3 is an operational characteristic diagram of the device shown in FIGS. 1 and 2;
FIG. 4 is another operating characteristic diagram of the device shown in FIGS. 1 and 2;
FIG. 5 is a schematic configuration diagram showing another embodiment of the distribution valve control device of the present invention.
FIG. 6 is a schematic configuration diagram showing another embodiment of the distribution valve control device of the present invention.
FIG. 7 is a schematic configuration diagram showing another embodiment of the distribution valve control device of the present invention.
FIG. 8 is a flowchart showing an operation of an operation valve determination unit of the distribution valve control device of the present invention.
FIG. 9 is a schematic configuration diagram showing another embodiment of the distribution valve control device of the present invention.
FIG. 10 is a schematic diagram showing a general water supply plant.
FIG. 11 is a schematic configuration diagram showing a conventional inflow / outflow valve control device.
FIG. 12 is an operation characteristic diagram of the conventional device.
FIG. 13 is a conceptual diagram showing a configuration of a distribution valve control device.
[Explanation of symbols]
1 pumps 23a, 23b... 23n Distributing valves 24a, 24b. Total 203 target flow rate calculation unit

Claims

A first valve installed at a pressurized fluid inlet and a plurality of second valves installed at each of a plurality of branched low pressure fluid outlets into which fluid flows from the fluid inlet; In the distribution valve control device for controlling the
A first physical quantity detection unit that detects a first inflow amount of the fluid flowing into the fluid inflow unit and a first valve opening degree of the first valve;
A first control operation unit that calculates a first operation amount for operating the first valve opening degree such that the first inflow amount detected by the first physical amount detection unit becomes a predetermined first target flow rate;
A first valve drive control unit that drives the first valve based on the first operation amount calculated by the first control calculation unit;
A second physical quantity detection unit that detects a second inflow amount of the fluid flowing into the plurality of fluid outflow units and a second valve opening of each of the plurality of second valves;
Each second operation amount for operating each of the second valve openings such that each of the second inflow amounts detected by the second physical amount detection unit becomes a predetermined second target flow rate. A second control calculation unit for calculating,
An operation valve determination unit that compares the magnitudes of the plurality of second operation amounts calculated by the second control calculation unit with each other and determines an operation valve that executes an operation of the plurality of second valves;
A second valve drive control unit that drives the second valve based on the second operation amount corresponding to the operation valve determined by the operation valve determination unit;
Equipped with a,
In a case where the second operation amount has a positive value, indicating that the corresponding second valve is operated in a direction in which the second valve opening degree is further opened, the operation valve determination unit includes:
Determining whether the maximum value of the plurality of second manipulated variables is a positive value,
When the maximum value is a positive value, the second valve that takes the maximum value is determined as the operation valve,
The distribution valve control device , wherein the second valve that takes the minimum value among the plurality of second operation amounts when the maximum value is not a positive value is determined as the operation valve .

In a distribution valve control device that controls each of a plurality of second valves installed in each of a plurality of branched low-pressure fluid outflow portions into which fluid flows from a pressurized fluid inflow portion,
A second physical quantity detection unit that detects a second inflow amount of the fluid flowing into the plurality of fluid outflow units and a second valve opening of each of the plurality of second valves;
Each second operation amount for operating each of the second valve openings such that each of the second inflow amounts detected by the second physical amount detection unit becomes a predetermined second target flow rate. A second control calculation unit for calculating,
An operation valve determination unit that compares the magnitudes of the plurality of second operation amounts calculated by the second control calculation unit with each other and determines an operation valve that executes an operation of the plurality of second valves;
A second valve drive control unit that drives the second valve based on the second operation amount corresponding to the operation valve determined by the operation valve determination unit;
Equipped with a,
In a case where the second operation amount has a positive value, indicating that the corresponding second valve is operated in a direction in which the second valve opening degree is further opened, the operation valve determination unit includes:
Determining whether the maximum value of the plurality of second manipulated variables is a positive value,
When the maximum value is a positive value, the second valve that takes the maximum value is determined as the operation valve,
The distribution valve control device , wherein the second valve that takes the minimum value among the plurality of second operation amounts when the maximum value is not a positive value is determined as the operation valve .

The apparatus further includes a target flow rate calculation unit that sets the second target flow rate of each of the fluids flowing into the plurality of fluid outflow units according to each of the second inflow amounts detected by the second physical quantity detection unit. The distribution valve control device according to claim 1, wherein: