JPH0340114A - Method and device for controlling fluid flow rate - Google Patents
Method and device for controlling fluid flow rateInfo
- Publication number
- JPH0340114A JPH0340114A JP17603889A JP17603889A JPH0340114A JP H0340114 A JPH0340114 A JP H0340114A JP 17603889 A JP17603889 A JP 17603889A JP 17603889 A JP17603889 A JP 17603889A JP H0340114 A JPH0340114 A JP H0340114A
- Authority
- JP
- Japan
- Prior art keywords
- opening
- flow rate
- command value
- deviation
- detected
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims description 24
- 230000007423 decrease Effects 0.000 claims description 39
- 238000001514 detection method Methods 0.000 claims description 14
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 21
- 101100491857 Columba livia ASL gene Proteins 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003973 irrigation Methods 0.000 description 3
- 230000002262 irrigation Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Flow Control (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、流体流量制御方法及びその装置に係り、特に
、流体源側から需要側へ供給される流体の流量を制御す
るに好適な流体流量制御方法及びその装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid flow rate control method and an apparatus thereof, and in particular, to a fluid flow rate control method and apparatus thereof, and particularly to a fluid flow rate control method and apparatus for controlling a fluid flow rate. The present invention relates to a flow rate control method and device.
従来、潅概用水路においては、幹線水路である幹線パイ
プラインに、このパイプラインから分岐した支線パイプ
を接続し、支線パイプを介して需要側へ水を供給する構
成が採用されている。この支線パイプの流量を制御する
場合、支線パイプに供給側バルブを設け、バルブの調整
によって流量を制御することがおこなわれている。この
バルブの制御方式としては、流量−量制御か開度−量制
御が採用されている。Conventionally, in irrigation canals, a configuration has been adopted in which a main pipeline, which is a main waterway, is connected to a branch pipe branched from this pipeline, and water is supplied to the demand side via the branch pipe. When controlling the flow rate of this branch pipe, the branch pipe is provided with a supply valve, and the flow rate is controlled by adjusting the valve. As a control method for this valve, flow rate-amount control or opening degree-amount control is adopted.
流量−量制御をおこなう場合は、特開昭６１６１４０１
号公報に記載されているように、目標流量と実流量とを
比較し、これらの偏差を零に抑制するために供給側バル
ブの開度が調整されるようになっている。このため、こ
の方式を用いれば、需要側に複数のバルブを設け、この
バルブを任意に開閉しても需要に応じた流量を需要側へ
供給することができる。When performing flow rate-volume control, please refer to Japanese Patent Application Laid-Open No. 6161401.
As described in the publication, the target flow rate and the actual flow rate are compared, and the opening degree of the supply side valve is adjusted in order to suppress the deviation between them to zero. Therefore, if this system is used, a plurality of valves are provided on the demand side, and even if the valves are arbitrarily opened and closed, a flow rate corresponding to the demand can be supplied to the demand side.
（発明が解決しようとする課題〕
上記従来技術においては、需要側バルブがすべ−
て全開状態に操作されることについては配慮されて′お
らず、供給側バルブと直列に配置された需要側バルブが
すべて全開状態に操作されると、支線パイプを流れる水
の流量か急激に減少する。このとき流量−量制御をその
まま継続すると、流量の減少を補正するために供給側バ
ルブの開度が順次全開方向に動作し、最終的には供給側
バルブが全開状態となる。この後需要側バルブを急激に
開弁操作すると、この開弁操作に応答して支線パイプ中
の水が需要側へ供給されるが、供給側バルブが全開状態
にあるため、供給側バルブの開度が設定開度となるまで
に多量の水が支線パイプに導入され、過剰取水状態とな
る。この過剰取水量が多い場合には、幹線パイプライン
内の流量が変動し、取水系にウォーターハンマーが生じ
たり、取水系に空気が混入したりする恐れがある。(Problems to be Solved by the Invention) In the above-mentioned prior art, no consideration is given to the fact that all the demand-side valves are operated in a fully open state, and the demand-side valves arranged in series with the supply-side valves are not considered. When all of the valves are fully open, the flow rate of water flowing through the branch pipe decreases rapidly.At this time, if flow rate control is continued as it is, the opening degrees of the supply side valves will be sequentially adjusted to compensate for the decrease in flow rate. It operates in the fully open direction, and finally the supply side valve becomes fully open.After this, when the demand side valve is suddenly opened, water in the branch pipe is supplied to the demand side in response to this valve opening operation. However, since the supply valve is fully open, a large amount of water is introduced into the branch pipe before the supply valve reaches the set opening, resulting in excessive water intake.This excess water intake is large. In such cases, the flow rate in the main pipeline may fluctuate, causing water hammer or air to enter the water intake system.
本発明の目的は、需要側の流体の需要量が急激に変化し
ても流体供給系に過剰な流体が導入されるのを防止する
ことができる流体流量制御方法及びその装置を提供する
ことにある。An object of the present invention is to provide a fluid flow rate control method and device that can prevent excessive fluid from being introduced into a fluid supply system even if the demand for fluid on the demand side changes rapidly. be.
前記目的を達成するために、本発明は、第１の制御方法
として、流体源側からの流体を導入して需要側へ導く流
体供給路の流量を検出すると共に前記流体供給路の流量
を調整するための供給側バルブの開度を検出し、検出開
度が許容範囲内に含まれるか否かを判定し、検出開度が
許容範囲内のときには前記検出流量と目標流量指令値と
の偏差を求め、この偏差を零に抑制するための開度指令
値を生成し、検出開度が許容範囲外のときには検出開度
が許容範囲外になったときの検出開度を開度指令値とし
て生成し、前記いずれかの開度指令値と供給側バルブの
検出開度との偏差を求め、この偏差を零に抑制するため
の操作指令値を生成し、この操作指令値に従って供給側
バルブの開度を調整する流体流量制御方法を採用したも
のである。In order to achieve the above object, the present invention provides a first control method that detects the flow rate of a fluid supply path that introduces fluid from the fluid source side and leads it to the demand side, and adjusts the flow rate of the fluid supply path. The opening degree of the supply side valve for the purpose of is calculated, and an opening command value is generated to suppress this deviation to zero, and when the detected opening is outside the allowable range, the detected opening when the detected opening is outside the allowable range is used as the opening command value. calculate the deviation between any of the opening command values and the detected opening of the supply-side valve, generate an operation command value to suppress this deviation to zero, and operate the supply-side valve according to this operation command value. This uses a fluid flow rate control method that adjusts the opening degree.
第２の制御方法として、流体源側からの流体を導入して
需要側へ導く流体供給路の流量を検出すると共に前記流
体供給路の流量を調整するための供給側バルブの開度を
検出し、検出開度が許容範囲内に含まれるか否かを判定
し、検出開度が許容範囲内のときには前記検出流量と目
標流量指令値との偏差を求め、この偏差を零に抑制する
ための開度指令値を生成し、検出開度が許容範囲外のと
きには特定の値を開度指令値として生成し、前記いずれ
かの開度指令値を供給側に供給側バルブの検出開度との
偏差を求め、この偏差を零に抑制するための操作指令値
を生成し、この操作指令値に従って供給側バルブの開度
を調整する流体流量制御方法を採用したものである。As a second control method, the flow rate of a fluid supply path that introduces fluid from the fluid source side to the demand side is detected, and the opening degree of a supply side valve for adjusting the flow rate of the fluid supply path is detected. , determines whether the detected opening is within the permissible range, determines the deviation between the detected flow rate and the target flow rate command value when the detected opening is within the permissible range, and calculates the deviation to suppress this deviation to zero. An opening command value is generated, and when the detected opening is outside the allowable range, a specific value is generated as the opening command value, and one of the opening command values is sent to the supply side to match the detected opening of the supply side valve. This method employs a fluid flow rate control method in which a deviation is determined, an operation command value for suppressing this deviation to zero is generated, and the opening degree of the supply side valve is adjusted in accordance with this operation command value.
第３の制御方法として、流体源側からの流体を需要側へ
導く流体供給路の流量を検出すると共に前記流体供給路
の流量を調整するための供給側バルブの開度を検出し、
検出流量と検出開度から流量と開度の増減傾向を監視し
、流量と開度の増減傾向が正常状態にあるときには検出
流量と目標流量指令値との偏差を零に抑制するための開
度指令値を生成し、流量と開度の増減傾向か正常状態か
ら外れ、流量減少時に開度が設定開度を越えたときには
設定開度以下の開度を開度指令値として生成し、前記い
ずれかの開度指令値と供給側バルブの開度との偏差を求
め、この偏差を零に抑制するための操作指令値を生成し
、この操作指令値に従って供給側バルブを調整する流体
流量制御方法を採用したものである。As a third control method, detecting the flow rate of a fluid supply path that guides fluid from the fluid source side to the demand side, and detecting the opening degree of a supply side valve for adjusting the flow rate of the fluid supply path,
The increase/decrease trend in flow rate and opening degree is monitored from the detected flow rate and detected opening degree, and when the increase/decrease trend in flow rate and opening degree is in a normal state, the opening degree is set to suppress the deviation between the detected flow rate and the target flow rate command value to zero. A command value is generated, and when the flow rate and opening degree deviate from the normal state and the opening degree exceeds the set opening degree when the flow rate decreases, the opening degree below the set opening degree is generated as the opening command value, and any of the above A fluid flow rate control method that calculates the deviation between the opening command value and the opening of the supply side valve, generates an operation command value to suppress this deviation to zero, and adjusts the supply side valve according to this operation command value. was adopted.
第４の制御方法として、流体源からの流体を需要側へ導
く流体供給路の流量を検出すると共に前記流体供給路の
流量を調整するための供給側バルブの開度を検出し、検
出開度と検出流量から流量と開度の増減傾向を監視しな
がら前記検出流量と目標流量指令値との偏差を求め、こ
の偏差を零に抑制するための開度指令値を生成し、前記
偏差が設定値を越え、かつ流量と開度が共に増加傾向に
あるときには開度指令値を間欠的に選択し、選択した開
度指令値と検出開度との偏差を求め、この偏差を零に抑
制するための操作指令値を生成し、この操作指令値に従
って供給側バルブの開度を調整する流体流量制御方法を
採用したものである。As a fourth control method, the flow rate of a fluid supply path that guides fluid from a fluid source to the demand side is detected, and the opening degree of a supply side valve for adjusting the flow rate of the fluid supply path is detected. The deviation between the detected flow rate and the target flow rate command value is determined from the detected flow rate while monitoring the increase/decrease trend in flow rate and opening degree, and an opening command value is generated to suppress this deviation to zero, and the deviation is set. When the value is exceeded and both the flow rate and opening are increasing, the opening command value is selected intermittently, the deviation between the selected opening command value and the detected opening is determined, and this deviation is suppressed to zero. This method employs a fluid flow rate control method that generates an operation command value for the operation and adjusts the opening degree of the supply-side valve according to this operation command value.
第１の制御装置として、流体源側からの流体を需要側へ
導く流体供給路の流量を検出する流量計１１
と、前記流体供給路の流量を検出指令値に従って調整す
る供給側バルブと、供給側バルブの開度を検出する開度
計と、開度計の検出による開度が許容範囲内に含まれる
か否かを判定する判定手段と、流量計の出力と目標流量
指令値との偏差を求め、この偏差を零に抑制するための
開度指令値を生成する開度指令値生成手段と、判定手段
により開度計の検出開度が許容範囲内に含まれると判定
されたときに開度指令値生成手段の出力を選択し、開度
計の検出開度が許容範囲外と判定されたときには開度計
の出力を選択する選択手段と、選択手段の選択による開
度と開度計の検出開度との偏差を求め、この偏差を零に
抑制するための操作指令値を生成して供給側バルブへ出
力する操作指令イ直生成手段を有する流体流量制御方法
を構成したものである。The first control device includes a flow meter 11 that detects the flow rate of a fluid supply path that guides fluid from the fluid source side to the demand side, a supply side valve that adjusts the flow rate of the fluid supply path according to a detected command value, and a supply side valve that adjusts the flow rate of the fluid supply path according to a detected command value. An opening meter that detects the opening of the side valve, a determination means that determines whether the opening detected by the opening meter is within the allowable range, and a deviation between the output of the flow meter and the target flow rate command value. and an opening command value generating means for generating an opening command value for suppressing this deviation to zero, and a determining means when it is determined that the opening detected by the opening meter is within a permissible range. a selection means that selects the output of the opening command value generation means and selects the output of the opening meter when the detected opening of the opening meter is determined to be outside the allowable range; and an opening and an opening determined by the selection means. This fluid flow rate control method includes direct generation means for determining the deviation from the opening degree detected by the meter, generating an operation command value for suppressing this deviation to zero, and outputting it to the supply side valve. be.
第２の制御装置として、流体源側からの流体を需要側へ
導く流体供給路の流量を検出する流量計と、前記流体供
給路の流量を操作指令値に従って調整する供給側バルブ
と、供給側バルブの開度を２
検出する開度計と、流量計と開度計の検出出力を監視し
て流量と開度の増減傾向が正常状態にあるか否かを判定
する判定手段と、流量計の出力と目標流量指令値との偏
差を求め、この偏差を零に抑制するための開度指令値を
生成する開度指令生成手段と、判定手段により流量と開
度の増減傾向が正常状態にあると判定されたときに開度
指令値生成手段の出力を選択し、流量と開度の増減傾向
が異常状態にあると判定されたときに開度計の出力を選
択する選択手段と、選択手段の選択による開度と開度計
の検出開度との偏差を求め、この偏差を零に抑制するた
めの操作指令値を生成して供給側バルブへ出力する操作
指令値生成手段とを有する流体流量制御方法を構成した
ものである。The second control device includes a flow meter that detects the flow rate of a fluid supply path that guides fluid from the fluid source side to the demand side, a supply side valve that adjusts the flow rate of the fluid supply path according to an operation command value, and a supply side valve that adjusts the flow rate of the fluid supply path according to an operation command value. 2. An opening meter that detects the opening degree of the valve; a determination means that monitors the detection outputs of the flow meter and the opening meter to determine whether the increase/decrease trend in the flow rate and opening degree is in a normal state; An opening command generating means calculates the deviation between the output of the output and the target flow rate command value, and generates an opening command value to suppress this deviation to zero, and a determining means determines the tendency of increase/decrease in the flow rate and opening to a normal state. selection means for selecting the output of the opening command value generation means when it is determined that the opening command value generation means is present, and selecting the output of the opening meter when it is determined that the increasing/decreasing tendency of the flow rate and opening is in an abnormal state; It has an operation command value generating means that calculates the deviation between the opening degree by selecting the means and the opening degree detected by the opening meter, generates an operation command value for suppressing this deviation to zero, and outputs it to the supply side valve. This is a configuration of a fluid flow rate control method.
第３の制御装置として、流体源側からの流体を需要側へ
導く流体供給路の流量を検出する流量計と、前記流体供
給路の流量を操作指令値に従って調整する供給側バルブ
と、供給側バルブの開度を検出する開度計と、流量計と
開度計の検出出力を監視して流量と開度が共に増加傾向
にあるか否かを判定する第１判定手段と、流量計の検出
流量と目標流量指令値との偏差が設定値を越えたか否か
を判定する第２判定手段と、流量計の検出流量と目標流
量指令値との偏差を求め、この偏差を零に抑制するため
の開度指令値を生成する開度指令生成手段と、第１判定
手段により流量と開度が共に増加傾向にあると判定され
、かつ第２判定手段により偏差が設定値を越えたと判定
されたことを条件に開度指令値生成手段の出力を間欠的
に選択する選択手段と、選択手段の選択による開度と開
度計の検出開度との偏差を求め、この偏差を零に抑制す
るための操作指令値を生成して供給側バルブへ出力する
操作指令値生成手段とを有する流体流量制御装置を構成
したものである。The third control device includes a flow meter that detects the flow rate of a fluid supply path that guides fluid from the fluid source side to the demand side, a supply side valve that adjusts the flow rate of the fluid supply path according to an operation command value, and a supply side valve that adjusts the flow rate of the fluid supply path according to an operation command value. an opening meter that detects the opening degree of the valve; a first determination means that monitors the detection outputs of the flow meter and the opening degree meter to determine whether both the flow rate and the opening degree are increasing; a second determining means for determining whether the deviation between the detected flow rate and the target flow rate command value exceeds a set value; and determining the deviation between the detected flow rate of the flowmeter and the target flow rate command value, and suppressing this deviation to zero. an opening command generation means for generating an opening command value for the opening, the first determination means determines that both the flow rate and the opening are on an increasing trend, and the second determination means determines that the deviation exceeds the set value. a selection means that intermittently selects the output of the opening command value generation means under the condition that the opening is determined, and the deviation between the opening selected by the selection means and the opening detected by the opening meter is suppressed to zero. This fluid flow rate control device includes an operation command value generation means for generating an operation command value for the supply side valve and outputting the generated operation command value to the supply side valve.
検出開度が許容範囲内となったときには検出開度又は特
定の値を開度指令値として選択し、この開度指令値に従
って供給側バルブの開度を調整するようにしたため、供
給側バルブの開度が特定の開度に固定される。このため
需要側の流体の需要量が急激に変化しても、流体供給路
内に過剰な流体が導入されるのが防止される。When the detected opening is within the allowable range, the detected opening or a specific value is selected as the opening command value, and the opening of the supply side valve is adjusted according to this opening command value. The opening degree is fixed at a specific opening degree. Therefore, even if the amount of fluid demanded on the demand side changes rapidly, excessive fluid is prevented from being introduced into the fluid supply path.
また流量と開度の増減傾向が正常状態から外れ、流量減
少時に開度が設定開度を越えたときには特定の開度を開
度指令値として選択し、選択した開度指令値に従って供
給側バルブの開度を調整するようにしたため、供給側の
流体の需要量が急激に変化しても、供給側バルブの開度
が特定の開度に固定され、流体供給路内に過剰の流体が
導入されるのが防止される。In addition, if the increase/decrease trend of the flow rate and opening degree deviates from the normal state and the opening degree exceeds the set opening degree when the flow rate decreases, a specific opening value is selected as the opening command value, and the supply side valve is controlled according to the selected opening command value. Since the opening degree of the valve is adjusted, even if the demand for fluid on the supply side changes rapidly, the opening degree of the supply side valve will be fixed at a specific opening degree, and excess fluid will not be introduced into the fluid supply path. be prevented from being
また、検出流量と目標流量指令値との偏差が設定値を越
え、かつ流量と開度が増加傾向にあるときには開度指令
値を間欠的に選択し、選択した開度指令値に従って供給
側バルブの開度を調整するようにしたため、需要側の流
体の需要量が急激に増加しても、流体供給路内には段階
的に流体が導入され、流体供給路内に過剰の流体が導入
されるのを防止することが可能となる。In addition, when the deviation between the detected flow rate and the target flow rate command value exceeds the set value and the flow rate and opening are increasing, the opening command value is selected intermittently, and the supply side valve is adjusted according to the selected opening command value. Since the opening degree of the fluid supply path is adjusted, even if the demand for fluid on the demand side increases rapidly, fluid is introduced into the fluid supply path in stages, and excessive fluid is not introduced into the fluid supply path. It is possible to prevent this from happening.
本発明の一実施例を図面に基づいて説明する。 An embodiment of the present invention will be described based on the drawings.
］５−
第１図において、貯水池からの水が供給される幹線パイ
プライン１０には流体供給路を構成する支線パイプ１２
が接続されており、支線パイプ１２の管路途中には、イ
ンダクションモータの開動により支線パイプ１２の流量
を調整する供給側バルブ１４、供給側バルブ１４の開度
を検出する開度計上６、支線パイプ１２の流量を検出す
る流量計１８が配置されている。そして支線パイプ上２
の先端側が複数の水路に分岐され、需要側バルブ２０を
介して用水路２２に接続されている。]5- In FIG. 1, the main pipeline 10 to which water is supplied from the reservoir has a branch pipe 12 constituting a fluid supply path.
In the middle of the branch pipe 12, there is a supply valve 14 that adjusts the flow rate of the branch pipe 12 by opening the induction motor, an opening meter 6 that detects the opening of the supply valve 14, and a branch line. A flow meter 18 is arranged to detect the flow rate of the pipe 12. And on the branch pipe 2
The tip side is branched into a plurality of waterways, and is connected to an irrigation waterway 22 via a demand-side valve 20.
流量計１８の検出出力は偏差計算器２４に供給されてお
り、ここで流量計１８の検出出力と流量設定器２６によ
り設定された目標流量指令値との偏差が算出されるよう
になっている。そして偏差計算器２４からはこの偏差を
零に抑制するための開度指令値が出力されるようになっ
ている。すなわち偏差計算器２４は開度指令値生成手段
として構成されている。偏差計算器２４の出力信号は一
致検出器２８、比例積分調節器３０に供給されている。The detected output of the flow meter 18 is supplied to a deviation calculator 24, which calculates the deviation between the detected output of the flow meter 18 and the target flow rate command value set by the flow rate setting device 26. . The deviation calculator 24 outputs an opening command value for suppressing this deviation to zero. That is, the deviation calculator 24 is configured as opening command value generation means. The output signal of the deviation calculator 24 is supplied to a coincidence detector 28 and a proportional-integral regulator 30.
一致検出器２８は偏差言１算器２４の出力が】６
設定値内になったとき１例えば流量計上８の検出流量が
目標流量指令値に近似したときに一致信号をＡＮＤゲー
ト３２へ出力するようになっている。The coincidence detector 28 outputs a coincidence signal to the AND gate 32 when the output of the deviation calculator 24 is within the set value 1, for example, when the detected flow rate of the flow meter 8 approaches the target flow rate command value. It looks like this.
ＡＮＤゲート３２は一致検出器２８からの一致信号を入
力したときに、開度計１６の検１七出力を取り込み、開
度計１６の検出開度の値を開度記憶回路３４へ転送する
ようになっている。そしてこのときの検出開度が開度記
憶回路３４に記憶されるようになっている。開度記憶回
路３４に記憶された開度の値は比較器３６に出力され、
比較器３６において開度計１６の検出開度と比較される
。比較器３６からは開度記憶回路３４に記憶された開度
と開度計１６の検出開度との偏差に応じた信号が出力さ
れ、この信号が切換器３８に供給される。When the AND gate 32 receives the coincidence signal from the coincidence detector 28, it takes in the detection output of the opening degree meter 16 and transfers the value of the detected opening degree of the opening degree meter 16 to the opening degree storage circuit 34. It has become. The detected opening degree at this time is stored in the opening degree storage circuit 34. The opening value stored in the opening storage circuit 34 is output to the comparator 36,
The comparator 36 compares the opening degree detected by the opening meter 16. The comparator 36 outputs a signal corresponding to the deviation between the opening stored in the opening storage circuit 34 and the opening detected by the opening gauge 16, and this signal is supplied to the switch 38.
切換器３８は比較器３６出力の偏差が許容範囲内に含ま
れるか否かを判定し、偏差が＋△Ｐ又は△Ｐを越えたと
きにスイッチ４Ｑの接点を接点ａからｂ側へ切り換える
ように構成されている。すなわち、一致検出器２８、Ａ
ＮＤゲート３２、開度記憶回路３４、比較器３６、切換
器３８は判定手段として構成されており、切換器３８、
スイッチ４０は選択手段として構成されている。The switch 38 determines whether the deviation of the output of the comparator 36 is within the allowable range, and switches the contact of the switch 4Q from the contact a to the contact b side when the deviation exceeds +△P or △P. It is composed of That is, coincidence detector 28, A
The ND gate 32, the opening degree storage circuit 34, the comparator 36, and the switch 38 are configured as determination means, and the switch 38,
The switch 40 is configured as selection means.
スイッチ４０により選択された信号は開度比較器４２に
供給され、ここで開度側１６の検出開度と比較される。The signal selected by the switch 40 is supplied to the opening comparator 42, where it is compared with the detected opening of the opening side 16.
開度比較器４２からは、スイッチ４０により選択された
開度と開度側１６の検出開度との偏差を零に抑制するた
めの操作指令値が出力されるようになっている。そして
開度比較器４２の出力信号は不感帯回路４４を介して供
給バルブ１４へ出力されるようになっている。不感帯回
路４４は、第２図に示されるように、操作指令値に対し
て不感帯の領域を有し、一致検出器２８から一致信号が
出力されるまでは不感帯△Ｐ□が設定され、一致検出器
２８から一致信号が出力されたときには不感帯ΔＰ２が
設定されるようになっている。すなわち操作指令値が不
感帯△Ｐ４、△Ｐ２の範囲外となったときにのみその値
が変化するようになっている。The opening comparator 42 outputs an operation command value for suppressing the deviation between the opening selected by the switch 40 and the detected opening of the opening side 16 to zero. The output signal of the opening comparator 42 is outputted to the supply valve 14 via a dead band circuit 44. As shown in FIG. 2, the dead zone circuit 44 has a dead zone area with respect to the operation command value, and until a coincidence signal is output from the coincidence detector 28, a dead zone △P□ is set, and a coincidence detection is performed. When a coincidence signal is output from the device 28, a dead zone ΔP2 is set. That is, the value changes only when the operation command value falls outside the range of the dead zones ΔP4 and ΔP2.
以上の構成において、目標流量指令値が第２図の特性Ｑ
、で示されるように変化すると、流量計１８の検出によ
る実流量Ｑ２と目標流量指令値Ｑｌとの偏差が偏差計算
器２４で算出され、この偏差に応じた信号が比例積分調
節器３０、スイッチ４０を介して開度比較器４２に供給
され、開度計１６の検出による検出開度との比較演算が
おこなわれる。このときの演算値は開度を増加方向にす
る操作指令値に変換され、この操作指令値によって供給
側バルブ１４の開度が増加方向に調整される。In the above configuration, the target flow rate command value is
, the deviation between the actual flow rate Q2 detected by the flow meter 18 and the target flow rate command value Ql is calculated by the deviation calculator 24, and a signal corresponding to this deviation is sent to the proportional integral regulator 30 The signal is supplied to the opening comparator 42 via the opening comparator 40, and a comparison operation is performed with the opening detected by the opening meter 16. The calculated value at this time is converted into an operation command value for increasing the opening degree, and the opening degree of the supply side valve 14 is adjusted in the increasing direction by this operation command value.
供給側バルブ１４の調整により実流量Ｑ２が目標流量指
令値Ｑｌにほぼ一致すると、一致検出器２８から一致信
号が出力され、不感帯回路４４に不感帯△Ｐ２が設定さ
れる。このときには、操作指令値が不感帯△Ｐ２を越え
たときにのみ供給側バルブ１４の開度が調整されること
になる。When the actual flow rate Q2 substantially matches the target flow rate command value Ql by adjusting the supply side valve 14, a coincidence signal is output from the coincidence detector 28, and a dead zone ΔP2 is set in the dead zone circuit 44. At this time, the opening degree of the supply side valve 14 is adjusted only when the operation command value exceeds the dead zone ΔP2.
次に、実流量Ｑ２が目標流量指令値Ｑ□にほぼ一致した
後、需要側バルブ２０が閉しられ実流量Ｑ２が急激に減
少すると、実流量Ｑ２と目標流量指令値Ｑｌとの偏差が
大きくなり、偏差計算器２４からは供給側バルブ１４の
開度を大きくするための開度指令値が出力される。これ
により開度比較器９−
４２から出力される操作指令値の値も大きくなり、供給
側バルブ１４の開度がさらに増加方向に移行する。そし
て開度計■６の検出開度が許容範囲子△Ｐを越えると、
切換器３８からの指令によってスイッチ４０が切り換え
られ、開度比較器４２には、開度指令値として開度臼１
６の検出開度が選択されることになる。すなわち開度比
較器４２には開度計１６の検出開度が共に入力されるた
め、開度比較器４２の操作指令値は一定値に固定される
。Next, after the actual flow rate Q2 almost matches the target flow rate command value Q□, when the demand side valve 20 is closed and the actual flow rate Q2 decreases rapidly, the deviation between the actual flow rate Q2 and the target flow rate command value Ql becomes large. Therefore, the deviation calculator 24 outputs an opening degree command value for increasing the opening degree of the supply side valve 14. As a result, the value of the operation command value output from the opening degree comparator 9-42 also increases, and the opening degree of the supply side valve 14 moves further in the increasing direction. If the opening detected by the opening gauge ■6 exceeds the allowable range △P,
The switch 40 is switched by the command from the changeover device 38, and the opening comparator 42 receives the opening mill 1 as the opening command value.
6 is selected. That is, since the opening degree detected by the opening degree meter 16 is also input to the opening degree comparator 42, the operation command value of the opening degree comparator 42 is fixed to a constant value.
すなわちスイッチ４０が切り換えられた時点の検出開度
を目標開度として供給側バルブ１４の開度が固定される
。これにより、実流量Ｑ２が急激に減少しても、供給側
バルブ上４の開度が一定開度に固定されるため、支線パ
イプ１２内に多量の水が導入されることはなく、過剰取
水を防止することができると共に過剰取水に伴うウォー
ターハンマーを防止することができる。That is, the opening degree of the supply side valve 14 is fixed with the detected opening degree at the time the switch 40 is switched as the target opening degree. As a result, even if the actual flow rate Q2 suddenly decreases, the opening degree of the upper supply valve 4 is fixed at a constant opening degree, so a large amount of water will not be introduced into the branch pipe 12, and excessive water intake will occur. It is possible to prevent water hammer caused by excessive water intake.
次に、流量と開度の増減傾向を監視して併給側バルブ１
４の開度を調整する実施例を第３図及び第４図に基づい
て説明する。Next, we monitor the increase/decrease trend in flow rate and opening degree, and
An example of adjusting the opening degree of No. 4 will be described based on FIGS. 3 and 4.
本実施例は、第１図に示されるＡＮＤゲート３２、開度
記憶回路３４、比較器３６、切換器３８の代わりに、逆
動作検出回路４６と、スイッチ４０關動用のタイマ４８
を設けたものであり、他の構成は前記実施例と同様であ
るので、同一のもの又は相当するものには同一符号を付
してそれらの説明は省略する。This embodiment uses a reverse operation detection circuit 46 and a timer 48 for operating the switch 40 instead of the AND gate 32, opening degree storage circuit 34, comparator 36, and switch 38 shown in FIG.
Since the other configurations are the same as those in the previous embodiment, the same or corresponding parts are given the same reference numerals and their explanation will be omitted.
逆動作検出回路４６は流量計１８の検出による検出流量
と開度計１６の検出による検出開度を監視し、流量と開
度の増減傾向が正常状態にあるか否かを判定する判定手
段として構成されている。The reverse operation detection circuit 46 serves as a determination means for monitoring the detected flow rate detected by the flow meter 18 and the detected opening degree detected by the opening degree meter 16, and determines whether the increasing/decreasing tendency of the flow rate and the opening degree is in a normal state. It is configured.
すなわち検出流量及び検出開度が共に増加するとき又は
共に減少するときを正常状態として判定し、検出流量が
減少状態にあるときに検出開度が増加傾向にあるときに
は異常状態と判定し、異常状態と判定したときには異常
信号をタイマ４８に出方するようになっている。タイマ
４８は異常信号を受けたときに起動し、異常信号が一定
時間以上入力されたとき、スイッチ４ｏに切換信号を出
力し、スイッチ４０の接点を接点ａ側から接点す側へ切
り換えるようになっている。すなわちタイマ４８とスイ
ッチ４０は選択手段として構成されている。In other words, when the detected flow rate and the detected opening degree both increase or decrease, it is determined to be a normal state, and when the detected flow rate is in a decreasing state and the detected opening degree tends to increase, it is determined to be an abnormal state. When it is determined that this is the case, an abnormal signal is output to the timer 48. The timer 48 starts when it receives an abnormal signal, and when the abnormal signal is input for a certain period of time or more, it outputs a switching signal to the switch 4o and switches the contact of the switch 40 from the contact a side to the contact side. ing. That is, the timer 48 and switch 40 are configured as selection means.
なお、不感帯回路４４は、一致検出器４８から一致信号
が出力されるまでは、第４図に示されるように、不感帯
△Ｐ、が設定され、一致信号が入力されたときに不感帯
△Ｐ２が設定されるようになっている。In the dead zone circuit 44, as shown in FIG. 4, a dead zone ΔP is set until a coincidence signal is output from the coincidence detector 48, and when a coincidence signal is input, a dead zone ΔP2 is set. It is now set.
以上の構成において、目標流量指令値が第５図の特性Ｑ
□のように設定されると、流量計上８の検出による実流
量Ｑ２が目標流量指令値Ｑｌにほぼ一致するまでは、実
流量Ｑ２と目標流量指令値Ｑ工との偏差に応じた開度指
令値が偏差計算器２４から出力され、供給側バルブ上４
の開度が増加する方向に調整される。供給側バルブ１４
の開度の調整により実流量Ｑ２が目標流量指令値Ｑｌに
ほぼ一致すると、−Ｍ検出器２８からの信号により不感
帯回路４４の不感帯がΔＰ２に設定される。さらに逆動
作検出回路４６には、一致検出器２８からの信号により
、このときの検出開度が基準値として設定される。In the above configuration, the target flow rate command value is
When set as shown in □, until the actual flow rate Q2 detected by the flow meter 8 almost matches the target flow rate command value Ql, the opening command is executed according to the deviation between the actual flow rate Q2 and the target flow rate command value Q. The value is output from the deviation calculator 24 and the value is output from the supply side valve 4.
The opening degree is adjusted in the direction of increasing. Supply side valve 14
When the actual flow rate Q2 almost coincides with the target flow rate command value Ql by adjusting the opening degree, the dead zone of the dead zone circuit 44 is set to ΔP2 by the signal from the -M detector 28. Further, in the reverse operation detection circuit 46, the detected opening degree at this time is set as a reference value by a signal from the coincidence detector 28.
実流量Ｑ２が目標流量指令値Ｑ工にほぼ一致した動作が
継続されているときに、各需要バルブ２０が閉じられて
実流量Ｑ２が急激に減少すると、実流量Ｑ２と目標流量
指令値Ｑｌとの偏差が大きくなり、偏差計算器２４から
は供給側バルブ１４の開度を増加させるための開度指令
値が出力される。If each demand valve 20 is closed and the actual flow rate Q2 rapidly decreases while the operation in which the actual flow rate Q2 substantially matches the target flow rate command value Q, the actual flow rate Q2 and the target flow rate command value Ql The deviation becomes large, and the deviation calculator 24 outputs an opening degree command value for increasing the opening degree of the supply side valve 14.
これにより供給側バルブ１４の開度が徐々に増加方向に
調整される。この状態が継続されると、逆動作検出回路
４６において、実流量Ｑ２が減少するときに検出開度が
増加傾向にあると判定し、このときの検出開度が設定開
度を越えると逆動作検出回路４６から異常信号が出力さ
れる。さらしこ異常信号が一定時間以上継続して出力さ
れるとタイマ４８から切換信号が出力され、スイッチ４
０が切り換えられる。As a result, the opening degree of the supply side valve 14 is gradually adjusted in the increasing direction. If this state continues, the reverse operation detection circuit 46 determines that the detected opening is increasing when the actual flow rate Q2 decreases, and if the detected opening at this time exceeds the set opening, the reverse operation is performed. An abnormality signal is output from the detection circuit 46. When the exposed abnormality signal continues to be output for a certain period of time or more, a switching signal is output from the timer 48, and the switch 4
0 is switched.
スイッチ４０の接点が接点ａから接点す側に切り換えら
れると、開度計↓６の検出開度が開度指令値として比例
積分調節器３０に供給されることになる。すなわち、ス
イッチ４０が取り換えられ３
たときの検出開度が開度指令値として固定され、この開
度指令値に従って供給側バルブ１４の開度が調整される
。このため需要側バルブ２０が閉じられて実流量Ｑ２が
急激に減少しても、供給側バルブ上４の開度が一定の開
度に固定されるので、過剰取水及び過剰取水に伴うウオ
ターハンマーを防止することができる。When the contact of the switch 40 is switched from the contact a to the contact side, the opening detected by the opening gauge ↓6 is supplied to the proportional-integral regulator 30 as an opening command value. That is, the opening degree detected when the switch 40 is replaced is fixed as the opening degree command value, and the opening degree of the supply side valve 14 is adjusted in accordance with this opening degree command value. Therefore, even if the demand-side valve 20 is closed and the actual flow rate Q2 suddenly decreases, the opening degree of the upper supply-side valve 4 is fixed at a constant opening degree, so water hammer due to excessive water intake and excessive water intake can occur. can be prevented.
また、前記実施例において、スイッチ４０を切り換えた
ときに、開度計１６の検出開度を開度指令値とする代り
に、特定の開度指令値を発生する設定器を比例積分調節
器３０の入力端に供給するようにしても、前記実施例と
同様な効果を得ることができる。Further, in the above embodiment, when the switch 40 is switched, instead of using the detected opening of the opening gauge 16 as the opening command value, a setting device that generates a specific opening command value is set to the proportional-integral regulator 30. Even if the signal is supplied to the input end of the input terminal, the same effect as in the above embodiment can be obtained.
次に本発明の他の実施例を第５図及び第６図に基づいて
説明する。Next, another embodiment of the present invention will be described based on FIGS. 5 and 6.
本実施例は、前記実施例における一致検出器２８の代り
に偏差検出器６０を設け、逆動作検出回路４６の代りに
増減傾向判別器５０、タイマ４８の代りにタイマ５２を
設け、さらにスイッチ４０の代りにスイッチ５８を設け
、スイッチ５８の接点す側に制限目標計算器５４、制限
目標幅設定器５６を設けたものであり、前記実施例と同
−又は相当するものには同一符号を付してそれらの説明
を省略する。In this embodiment, a deviation detector 60 is provided in place of the coincidence detector 28 in the previous embodiment, an increase/decrease trend discriminator 50 is provided in place of the reverse operation detection circuit 46, a timer 52 is provided in place of the timer 48, and a switch 40 is provided in place of the timer 48. A switch 58 is provided in place of the switch 58, and a limit target calculator 54 and a limit target width setter 56 are provided on the contact side of the switch 58. Components that are the same as or equivalent to those in the previous embodiment are given the same reference numerals. and their explanation will be omitted.
偏差検出器６０は偏差計算器２４の出力を監視し、実流
量Ｑ２と目標流量Ｑ□との偏差がほぼ零になったときに
一致信号を不感帯回路４４とタイマ５２及び増減傾向判
別器５０へ出力し、この一致検出後に実流量Ｑ２と目標
流量指令値Ｑｌとの偏差が設定値を越えたときに、異常
信号をタイマ５２に出力するようになっている。増減傾
向判別器５０は流量計上８の検出流量と開度計１６の検
出開度を監視し、流量及び開度が共に増加傾向にあると
きには１′１”の信号をタイマ５２に出力し、流量及び
開度が共に減少傾向にあるときには、○″の信号をタイ
マ５２に出力するようになっている。タイマ５２は増減
傾向判別器５０からＩＩ ＯＩＩの信号を受けたときに
はスイッチ５８へ第１の切換信号を出力し、スイッチ５
８の接点ａを接点す側へ切り換えさせるようになってい
る。またタイマ５２は増減傾向判別器５０からＩＩ Ｉ
ＩＩの信号が入力され、かつ偏差検出器６０から異常
信号が入力されたときには、スイッチ５８へ第２の切換
信号を出力し、スイッチ５８の接点を接点ａから接点Ｃ
側に一定時間ごとに切り換えるようになっている。すな
わち偏差計算器２４から出力される開度指令値を間欠的
に選択するようになっている。The deviation detector 60 monitors the output of the deviation calculator 24 and sends a coincidence signal to the dead band circuit 44, timer 52, and increase/decrease trend discriminator 50 when the deviation between the actual flow rate Q2 and the target flow rate Q□ becomes almost zero. After detecting the coincidence, when the deviation between the actual flow rate Q2 and the target flow rate command value Ql exceeds a set value, an abnormality signal is output to the timer 52. The increase/decrease trend discriminator 50 monitors the flow rate detected by the flow meter 8 and the opening degree detected by the opening gauge 16, and when both the flow rate and the opening degree are in an increasing trend, it outputs a signal of 1'1'' to the timer 52, and the flow rate is increased. When the opening degree and the opening degree both tend to decrease, a signal of ◯'' is output to the timer 52. When the timer 52 receives the II OII signal from the increase/decrease trend discriminator 50, it outputs a first switching signal to the switch 58, and the switch 5
The contact a of No. 8 is switched to the contact side. Also, the timer 52 is connected to the increase/decrease trend discriminator 50 to
When the signal II is input and an abnormal signal is input from the deviation detector 60, a second switching signal is output to the switch 58, and the contacts of the switch 58 are changed from contact A to contact C.
The side is switched at regular intervals. That is, the opening command value output from the deviation calculator 24 is selected intermittently.
また制御目標幅設定値５６には制御目標幅としてΔＰＱ
が設定されるようになっており、スイッチ５８の接点が
接点ａから接点す側に切り換えられると、流量計１８の
検出流量に目標制限幅ΔＰＱが加算され、この加算され
た値が開度指令値として比例積分調節器３０へ入力され
るようになっている。In addition, the control target width setting value 56 includes ΔPQ as the control target width.
is set, and when the contact of the switch 58 is switched from the contact a to the contact side, the target limit width ΔPQ is added to the flow rate detected by the flow meter 18, and this added value becomes the opening command. It is designed to be input as a value to the proportional-integral regulator 30.
以上の構成において、流量設定器２６により目標流量指
令値が第６図の特性Ｑｌで示されるように設定されると
、実流量Ｑ２が目標流量指令値Ｑ。In the above configuration, when the target flow rate command value is set by the flow rate setter 26 as shown by the characteristic Ql in FIG. 6, the actual flow rate Q2 becomes the target flow rate command value Q.
にほぼ一致するまで目標流量指令値Ｑｌと実流量Ｑｌと
の偏差に応じた開度指令値が偏差計算器２４から出力さ
れ、供給側バルブ１４の開度を増加方向に調整する制御
がおこなわれる。そして目標流量指令値Ｑ□と実流量Ｑ
２がほぼ一致すると、偏差検出器６０から一致信号が出
力される。これにより、このときの検出流量及び検出開
度が基準値として増減傾向判別器５０に設定される。さ
らに一致信号によりタイマ５２が起動し一定時間後にス
イッチ５８の接点が接点ａから接点す側に切り換えられ
る。すなわち流量計１８の検出流量に制限目標幅ΔＰＱ
が加算され、この値が開度指令値として比例積分調節器
３０に入力される。このため、需要側バルブ２０が閉じ
られ、実流量Ｑ２が徐々に減少した場合、実流量Ｑ２の
減少に追従して開度指令値の値が徐々に小さくなり、供
給側バルブ１４の開度が減少する方向に調整される。An opening command value corresponding to the deviation between the target flow rate command value Ql and the actual flow rate Ql is output from the deviation calculator 24 until the target flow rate command value Ql and the actual flow rate Ql almost match, and control is performed to adjust the opening degree of the supply side valve 14 in an increasing direction. . Then, the target flow rate command value Q□ and the actual flow rate Q
2 substantially match, the deviation detector 60 outputs a match signal. Thereby, the detected flow rate and the detected opening degree at this time are set as reference values in the increase/decrease tendency discriminator 50. Furthermore, the timer 52 is activated by the coincidence signal, and after a certain period of time, the contact of the switch 58 is switched from the contact a to the contact side. In other words, the target width ΔPQ is limited to the detected flow rate of the flow meter 18.
is added, and this value is input to the proportional-integral regulator 30 as the opening command value. Therefore, when the demand-side valve 20 is closed and the actual flow rate Q2 gradually decreases, the opening command value gradually decreases following the decrease in the actual flow rate Q2, and the opening degree of the supply-side valve 14 decreases. Adjusted to decrease.
次に実流量Ｑ２が減少した後、需要側バルブ２０が開か
れて実流量Ｑ２が増加すると、実流量Ｑ２の増加に伴っ
て供給側バルブ１４の開度も増加方向に調整される。そ
してこの状態が継続されると、増減傾向判別器５０によ
り検出流量及び検７
出開度が共に増加傾向にあるとして判定し、タイマ５２
に起動信号が出力される。さらにこのときには、目標流
量指令値Ｑユと実流量Ｑｌとの偏差が設定値を越えてい
るため、タイマ２２から第２の切換信号が出力され、ス
イッチ５８の接点が接点ａ側から接点Ｃ側に間欠的に切
り換えられる。すなわち偏差計算器２４からの開度指令
値が間欠的に選択される。このため、第６図の時間上□
からｔ２に示されるように、スイッチ５８が接点Ｃ側へ
切り換えられたときには実流量Ｑ２及び検出開度が一定
値に維持され、スイッチ５８の接点がａ側に切り換えら
れたときには、時間Ｌ２からＬ３に示されるように、実
流量Ｑ２の増加に応じて供給側バルブ１４の開度が増加
方向に調整される。このような制御は実流量Ｑ２が目標
流量指令値Ｑｌにほぼ一致するまで継続され、一致した
時点ではスイッチ５８の接点が接点ａに固定され、実流
量Ｑ２と目標流量指令値Ｑｌとの偏差に応じて供給側バ
ルブ上４の開度が調整されることになる。Next, after the actual flow rate Q2 decreases, when the demand side valve 20 is opened and the actual flow rate Q2 increases, the opening degree of the supply side valve 14 is also adjusted in the increasing direction as the actual flow rate Q2 increases. If this state continues, the increase/decrease trend discriminator 50 determines that both the detected flow rate and the detection opening are in an increasing trend, and the timer 52
A start signal is output. Furthermore, at this time, since the deviation between the target flow rate command value QU and the actual flow rate Ql exceeds the set value, the second switching signal is output from the timer 22, and the contact of the switch 58 changes from the contact A side to the contact C side. is switched intermittently. That is, the opening degree command value from the deviation calculator 24 is selected intermittently. For this reason, above the time in Figure 6 □
As shown from t2 to t2, when the switch 58 is switched to the contact C side, the actual flow rate Q2 and the detected opening degree are maintained at constant values, and when the contact of the switch 58 is switched to the a side, the time is changed from L2 to L3. As shown in FIG. 2, the opening degree of the supply side valve 14 is adjusted in the increasing direction in accordance with the increase in the actual flow rate Q2. This kind of control is continued until the actual flow rate Q2 almost matches the target flow rate command value Ql, and at the point when they match, the contact point of the switch 58 is fixed at contact a, and the deviation between the actual flow rate Q2 and the target flow rate command value Ql is The opening degree of the upper supply valve 4 is adjusted accordingly.
このように、本実施例においては、需要側パル８
ブ２０のバルブがすべて閉じられた後需要側バルブ２０
がすべて開かれた場合でも、供給側バルブ１４が段階的
に開かれるため、支線パイプ上２に急激に水が導入され
るのが防止され、支線パイプ１２に連結された給水系に
擾乱が発生するのを防止することができると共に過剰取
水を防止することができる。In this way, in this embodiment, after all the valves of the demand-side valves 8 and 20 are closed, the demand-side valves 20
Even if all of It is possible to prevent this from occurring and also to prevent excessive water intake.
以上説明したように、本発明によれば、流体供給路に接
続された流路の需要側バルブが閉じられて需要量が急変
した場合、供給側バルブの開度を一定の開度に保持する
ようにしたため、過剰取水を防止することができると共
に過剰取水に伴う衝撃を流体供給系に与えるのを防止す
ることができる。また需要側バルブが閉しられた後、需
要側バルブが開かれて需要量が急激に増加した場合でも
。As explained above, according to the present invention, when the demand side valve of the flow path connected to the fluid supply path is closed and the demand quantity suddenly changes, the opening degree of the supply side valve is maintained at a constant opening degree. As a result, it is possible to prevent excessive water intake, and it is also possible to prevent the fluid supply system from being subjected to shock due to excessive water intake. Also, even if the demand-side valve is closed and then the demand-side valve is opened, resulting in a sudden increase in demand.
流体を段階的に供給するようにしたため、流体供給路に
連結された流体供給系に擾乱が発生するのを防止するこ
とができると共に過剰な流体の導入を防止することがで
きる。Since the fluid is supplied in stages, it is possible to prevent disturbance from occurring in the fluid supply system connected to the fluid supply path, and it is also possible to prevent excessive fluid from being introduced.
第１図は本発明の第１実施例を示す構成図、第２図は第
１図の作用を説明するための説明図、第３図は本発明の
第２実施例を示す構成図、第４図は第３図の作用を説明
するための説明図、第５図は本発明の第３実施例を示す
構成図、第６図は第５図の作用を説明するための説明図
である。
↓０・・幹線パイプライン、］−２・・・支線パイプ、
１４・・供給側バルブ、１６ 開度計、１８・・・流量
計、２０・需要側バルブ、２２・用水路、２４・・偏差
計算器、
２６・流量測定器、２８・・一致検出器、３０ ・比例
積分調節器、３２・・Ａ、 Ｎ Ｄゲート、３４・開度
記憶回路、３６ 比較器、
３８・切換器、４０ スイッチ、
４２・開度比較器、４４・・不感帯回路、４６ ・逆動
作検出回路、４８・・タイマ、５０・・増減傾向判別器
、５２ タイマ、５４・制限目標計算器、５６・・・制
限目標幅設定器５８・スイッチ、６０・・・偏差検出器
。1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining the operation of FIG. 1, and FIG. 3 is a block diagram showing a second embodiment of the present invention. 4 is an explanatory diagram for explaining the operation of FIG. 3, FIG. 5 is a configuration diagram showing a third embodiment of the present invention, and FIG. 6 is an explanatory diagram for explaining the operation of FIG. 5. . ↓0... Main pipeline, ]-2... Branch pipe,
14. Supply side valve, 16 Openness meter, 18. Flow meter, 20. Demand side valve, 22. Irrigation channel, 24. Deviation calculator, 26. Flow rate measuring device, 28. Coincidence detector, 30・Proportional integral regulator, 32...A, ND gate, 34・Opening memory circuit, 36 Comparator, 38・Switcher, 40 Switch, 42・Opening comparator, 44・Dead band circuit, 46 ・Reverse Operation detection circuit, 48...Timer, 50...Increase/decrease trend discriminator, 52 Timer, 54...Limit target calculator, 56... Limit target width setter 58/Switch, 60... Deviation detector.
Claims (1)
給路の流量を検出すると共に前記流体供給路の流量を調
整するための供給側バルブの開度を検出し、検出開度が
許容範囲内に含まれるか否かを判定し、検出開度が許容
範囲内のときには前記検出流量と目標流量指令値との偏
差を求め、この偏差を零に抑制するための開度指令値を
生成し、検出開度が許容範囲外のときには検出開度が許
容範囲外になったときの検出開度を開度指令値として生
成し、前記いずれかの開度指令値と供給側バルブの検出
開度との偏差を求め、この偏差を零に抑制するための操
作指令値を生成し、この操作指令値に従って供給側バル
ブの開度を調整する流体流量制御方法。 ２、流体源側からの流体を導入して需要側へ導く流体供
給路の流量を検出すると共に前記流体供給路の流量を調
整するための供給側バルブの開度を検出し、検出開度が
許容範囲内に含まれるか否かを判定し、検出開度が許容
範囲内のときには前記検出流量と目標流量指令値との偏
差を求め、この偏差を零に抑制するための開度指令値を
生成し、検出開度が許容範囲外のときには特定の値を開
度指令値として生成し、前記いずれかの開度指令値を供
給側に供給側バルブの検出開度との偏差を求め、この偏
差を零に抑制するための操作指令値を生成し、この操作
指令値に従って供給側バルブの開度を調整する流体流量
制御方法。３、流体源側からの流体を需要側へ導く流体
供給路の流量を検出すると共に前記流体供給路の流量を
調整するための供給側バルブの開度を検出し、検出流量
と検出開度から流量と開度の増減傾向を監視し、流量と
開度の増減傾向が正常状態にあるときには検出流量と目
標流量指令値との偏差を零に抑制するための開度指令値
を生成し、流量と開度の増減傾向が正常状態から外れ、
流量減少時に開度が設定開度を越えたときには設定開度
以下の開度を開度指令値として生成し、前記いずれかの
開度指令値と供給側バルブの開度との偏差を求め、この
偏差を零に抑制するための操作指令値を生成し、この操
作指令値に従って供給側バルブを調整する流体流量制御
方法。 ４、流体源からの流体を需要側へ導く流体供給路の流量
を検出すると共に前記流体供給路の流量を調整するため
の供給側バルブの開度を検出し、検出開度と検出流量か
ら流量と開度の増減傾向を監視しながら前記検出流量と
目標流量指令値との偏差を求め、この偏差を零に抑制す
るための開度指令値を生成し、前記偏差が設定値を越え
、かつ流量と開度が共に増加傾向にあるときには開度指
令値を間欠的に選択し、選択した開度指令値と検出開度
との偏差を求め、この偏差を零に抑制するための操作指
令値を生成し、この操作指令値に従って供給側バルブの
開度を調整する流体流量制御方法。 ５、流体源側からの流体を需要側へ導く流体供給路の流
量を検出する流量計と、前記流体供給路の流量を検出指
令値に従って調整する供給側バルブと、供給側バルブの
開度を検出する開度計と、開度計の検出による開度が許
容範囲内に含まれるか否かを判定する判定手段と、流量
計の出力と目標流量指令値との偏差を求め、この偏差を
零に抑制するための開度指令値を生成する開度指令値生
成手段と、判定手段により開度計の検出開度が許容範囲
内に含まれると判定されたときに開度指令値生成手段の
出力を選択し、開度計の検出開度が許容範囲外と判定さ
れたときには開度計の出力を選択する選択手段と、選択
手段の選択による開度と開度計の検出開度との偏差を求
め、この偏差を零に抑制するための操作指令値を生成し
て供給側バルブへ出力する操作指令値生成手段を有する
流体流量制御方法。 ６、流体源側からの流体を需要側へ導く流体供給路の流
量を検出する流量計と、前記流体供給路の流量を操作指
令値に従って調整する供給側バルブと、供給側バルブの
開度を検出する開度計と、流量計と開度計の検出出力を
監視して流量と開度の増減傾向が正常状態にあるか否か
を判定する判定手段と、流量計の出力と目標流量指令値
との偏差を求め、この偏差を零に抑制するための開度指
令値を生成する開度指令生成手段と、判定手段により流
量と開度の増減傾向が正常状態にあると判定されたとき
に開度指令値生成手段の出力を選択し、流量と開度の増
減傾向が異常状態にあると判定されたときに開度計の出
力を選択する選択手段と、選択手段の選択による開度と
開度計の検出開度との偏差を求め、この偏差を零に抑制
するための操作指令値を生成して供給側バルブへ出力す
る操作指令値生成手段とを有する流体流量制御方法。 ７、流体源側からの流体を需要側へ導く流体供給路の流
量を検出する流量計と、前記流体供給路の流量を操作指
令値に従って調整する供給側バルブと、供給側バルブの
開度を検出する開度計と、流量計と開度計の検出出力を
監視して流量と開度が共に増加傾向にあるか否かを判定
する第１判定手段と、流量計の検出流量と目標流量指令
値との偏差が設定値を越えたか否かを判定する第２判定
手段と、流量計の検出流量と目標流量指令値との偏差を
求め、この偏差を零に抑制するための開度指令値を生成
する開度指令生成手段と、第１判定手段により流量と開
度が共に増加傾向にあると判定され、かつ第２判定手段
により偏差が設定値を越えたと判定されたことを条件に
開度指令値生成手段の出力を間欠的に選択する選択手段
と、選択手段の選択による開度と開度計の検出開度との
偏差を求め、この偏差を零に抑制するための操作指令値
を生成して供給側バルブへ出力する操作指令値生成手段
とを有する流体流量制御装置。[Claims] 1. Detecting the flow rate of a fluid supply path that introduces fluid from the fluid source side to the demand side, and detecting the opening degree of a supply side valve for adjusting the flow rate of the fluid supply path. Then, it is determined whether the detected opening is within the permissible range, and when the detected opening is within the permissible range, the deviation between the detected flow rate and the target flow rate command value is determined, and this deviation is suppressed to zero. When the detected opening is outside the allowable range, the detected opening when the detected opening is outside the allowable range is generated as an opening command value, and one of the above opening command values is generated. A fluid flow rate control method that calculates the deviation between the detected opening of the supply valve, generates an operation command value to suppress this deviation to zero, and adjusts the opening of the supply valve according to this operation command value. 2. Detect the flow rate of a fluid supply path that introduces fluid from the fluid source side and guide it to the demand side, and also detect the opening degree of the supply side valve for adjusting the flow rate of the fluid supply path, and detect the opening degree of the fluid supply path. Determine whether or not the detected opening is within the permissible range, and if the detected opening is within the permissible range, find the deviation between the detected flow rate and the target flow rate command value, and set the opening command value to suppress this deviation to zero. When the detected opening is outside the allowable range, a specific value is generated as the opening command value, and the deviation between the opening command value and the detected opening of the supply side valve is determined on the supply side. A fluid flow rate control method that generates an operation command value to suppress the deviation to zero, and adjusts the opening degree of the supply side valve according to this operation command value. 3. Detect the flow rate of a fluid supply path that guides fluid from the fluid source side to the demand side, and also detect the opening degree of the supply side valve for adjusting the flow rate of the fluid supply path, and from the detected flow rate and the detected opening degree. The increase/decrease trend in flow rate and opening degree is monitored, and when the increase/decrease trend in flow rate and opening degree is in a normal state, an opening degree command value is generated to suppress the deviation between the detected flow rate and the target flow rate command value to zero, and the flow rate is and the tendency of increase/decrease in the opening degree deviates from the normal state,
When the opening exceeds the set opening when the flow rate decreases, an opening below the set opening is generated as an opening command value, and the deviation between any of the opening command values and the opening of the supply side valve is determined; A fluid flow rate control method that generates an operation command value to suppress this deviation to zero, and adjusts a supply-side valve according to this operation command value. 4. Detect the flow rate of the fluid supply path that leads fluid from the fluid source to the demand side, and also detect the opening degree of the supply side valve for adjusting the flow rate of the fluid supply path, and calculate the flow rate from the detected opening degree and the detected flow rate. The deviation between the detected flow rate and the target flow rate command value is determined while monitoring the increase/decrease trend in the opening degree, an opening command value is generated to suppress this deviation to zero, and the deviation exceeds the set value, and When both flow rate and opening are increasing, the opening command value is selected intermittently, the deviation between the selected opening command value and the detected opening is determined, and the operation command value is used to suppress this deviation to zero. A fluid flow control method that generates a flow rate and adjusts the opening of the supply valve according to this operation command value. 5. A flow meter that detects the flow rate of a fluid supply path that leads fluid from the fluid source side to the demand side, a supply side valve that adjusts the flow rate of the fluid supply path according to a detected command value, and an opening degree of the supply side valve. An opening meter to be detected, a determination means for determining whether the opening degree detected by the opening meter is within an allowable range, and a deviation between the output of the flow meter and the target flow rate command value, and this deviation is determined. An opening command value generation means for generating an opening command value for suppressing the opening to zero, and an opening command value generation means when the determination means determines that the opening detected by the opening meter is within an allowable range. a selection means for selecting the output of the position meter and selecting the output of the position meter when the position detected by the position meter is determined to be outside the permissible range; 1. A fluid flow rate control method comprising an operation command value generation means for determining a deviation of the deviation, generating an operation command value for suppressing this deviation to zero, and outputting the generated operation command value to a supply side valve. 6. A flow meter that detects the flow rate of a fluid supply path that leads fluid from the fluid source side to the demand side, a supply side valve that adjusts the flow rate of the fluid supply path according to an operation command value, and an opening degree of the supply side valve. An opening meter to detect, a determination means to monitor the detection outputs of the flow meter and the opening meter to determine whether the increase/decrease tendency of the flow rate and opening degree is in a normal state, and an output of the flow meter and a target flow rate command. an opening command generating means that calculates the deviation from the opening command value and generates an opening command value for suppressing this deviation to zero, and a determining means when it is determined that the increase/decrease trend in flow rate and opening is in a normal state. a selection means for selecting the output of the opening command value generating means when the flow rate and the opening degree are determined to be in an abnormal state; and an operation command value generation means for determining the deviation between the opening degree detected by the opening degree meter, generating an operation command value for suppressing this deviation to zero, and outputting the generated operation command value to the supply side valve. 7. A flow meter that detects the flow rate of a fluid supply path that leads fluid from the fluid source side to the demand side, a supply side valve that adjusts the flow rate of the fluid supply path according to an operation command value, and an opening degree of the supply side valve. a first determination means that monitors the detection outputs of the flow meter and the opening degree to determine whether both the flow rate and the opening degree are increasing, and the flow rate detected by the flow meter and the target flow rate. a second determining means for determining whether the deviation from the command value exceeds a set value; and an opening command for determining the deviation between the detected flow rate of the flowmeter and the target flow rate command value and suppressing this deviation to zero. The condition is that the opening command generating means for generating the value and the first determining means determine that both the flow rate and the opening are on an increasing trend, and the second determining means determines that the deviation exceeds the set value. A selection means for intermittently selecting the output of the opening command value generation means, and an operation command for determining the deviation between the opening selected by the selection means and the opening detected by the opening meter, and suppressing this deviation to zero. A fluid flow rate control device comprising operation command value generation means for generating a value and outputting it to a supply side valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1176038A JPH087629B2 (en) | 1989-07-07 | 1989-07-07 | Fluid flow rate control method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1176038A JPH087629B2 (en) | 1989-07-07 | 1989-07-07 | Fluid flow rate control method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0340114A true JPH0340114A (en) | 1991-02-20 |
| JPH087629B2 JPH087629B2 (en) | 1996-01-29 |
Family
ID=16006636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1176038A Expired - Lifetime JPH087629B2 (en) | 1989-07-07 | 1989-07-07 | Fluid flow rate control method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH087629B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100482381B1 (en) * | 2003-06-24 | 2005-04-14 | 쌍용자동차 주식회사 | Side panel of carrying room for goods automobile |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012020597A1 (en) | 2010-08-12 | 2012-02-16 | 日本応用光学株式会社 | Illumination device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57187715A (en) * | 1981-05-13 | 1982-11-18 | Toshiba Corp | Control system for constant flow rate of gate valve |
| JPS62152001A (en) * | 1985-12-26 | 1987-07-07 | Fuji Electric Co Ltd | Water supply system |
| JPS6356701A (en) * | 1986-08-28 | 1988-03-11 | Ishikawajima Harima Heavy Ind Co Ltd | Steam temperature advance controller for boiler |
-
1989
- 1989-07-07 JP JP1176038A patent/JPH087629B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57187715A (en) * | 1981-05-13 | 1982-11-18 | Toshiba Corp | Control system for constant flow rate of gate valve |
| JPS62152001A (en) * | 1985-12-26 | 1987-07-07 | Fuji Electric Co Ltd | Water supply system |
| JPS6356701A (en) * | 1986-08-28 | 1988-03-11 | Ishikawajima Harima Heavy Ind Co Ltd | Steam temperature advance controller for boiler |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100482381B1 (en) * | 2003-06-24 | 2005-04-14 | 쌍용자동차 주식회사 | Side panel of carrying room for goods automobile |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH087629B2 (en) | 1996-01-29 |
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