JPH0330886B2 - - Google Patents
Info
- Publication number
- JPH0330886B2 JPH0330886B2 JP8689582A JP8689582A JPH0330886B2 JP H0330886 B2 JPH0330886 B2 JP H0330886B2 JP 8689582 A JP8689582 A JP 8689582A JP 8689582 A JP8689582 A JP 8689582A JP H0330886 B2 JPH0330886 B2 JP H0330886B2
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- time
- maximum
- interrupter
- deviation
- 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.)
- Expired
Links
- 238000010977 unit operation Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Magnetically Actuated Valves (AREA)
- Flow Control (AREA)
Description
【発明の詳細な説明】
本発明は、マイクロコンピユータで電動弁の動
作を制御する流量制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow control device that controls the operation of an electric valve using a microcomputer.
従来、流量制御における電動弁の開度を複数回
に分割して操作するインタラプタは、スロースタ
ータあるいはクツシヨンスタータと呼ばれている
ように、無流量から設定流量に到達するまでの操
作端における急激な状態変化の防止が目的であ
り、設定流量に達したのちはPID制御を行なう場
合であつても、インタラプタの動作時間と停止時
間はあらかじめ適当に定められた一定時間に固定
した制御が行なわれており、これらの時間の変更
はもつぱら操作時間の調整にすぎなかつた。すな
わち、設定流量に早く到達するためには、第１図
に示すように、インタラプタの動作時間Taを比
較的長くし停止時間Tbを小さく設定すればよい
が、流量の追従遅れが大きな管系では、弁の開き
による流量変化が安定しないうちにつぎの動作指
令が出され、流量が過大になつて設定流量円越え
てＡで示すようにオーバーシユートを生じる危険
がある。なお、点線Ｂはつぎの開指令がなかつた
ときの流量変化特性を示す。 Conventionally, interrupters that operate the opening of an electric valve in flow control by dividing the opening into multiple times are called slow starters or cushion starters. Even if PID control is performed after the set flow rate is reached, the interrupter's operating time and stop time are controlled to be fixed at a predetermined fixed time. These time changes were merely adjustments to the operating time. In other words, in order to reach the set flow rate quickly, as shown in Figure 1, the interrupter's operating time Ta should be set relatively long and the stop time Tb should be set small. If the next operation command is issued before the change in flow rate due to the opening of the valve is stabilized, there is a danger that the flow rate will become excessive and exceed the set flow rate circle, resulting in an overshoot as shown at A. Note that the dotted line B shows the flow rate change characteristic when there is no next opening command.
また、第２図のように動作時間Taを短かく設
定し、停止時間Tbを長くしておけば、オーバー
シユートの影響は小さくなるが、設定流量Rsに
灯達するまでの時間が長くなり、弁を操作する電
動機のオン・オフの回数が増えて機械的消耗がは
げしくなるなどの欠点がある。 In addition, if the operating time Ta is set short and the stop time Tb is set long as shown in Figure 2, the effect of overshoot will be reduced, but the time required to reach the set flow rate Rs will be longer. This method has the disadvantage that the electric motor that operates the valve has to be turned on and off more frequently, resulting in increased mechanical wear and tear.
本発明は上述の点にかんがみ、弁の開動作と流
量を整定させるための停止動作を含む１回の単位
動作ごとに、インタラプタの動作を最適時間に調
整し、円滑に流量を設定値に到達させるようにし
たもので、これを第３図ないし第５図に示す実施
例について説明する。 In view of the above-mentioned points, the present invention adjusts the interrupter operation to the optimum time for each unit operation including the opening operation of the valve and the stopping operation to stabilize the flow rate, so that the flow rate smoothly reaches the set value. The embodiment shown in FIGS. 3 to 5 will be described below.
第３図は本発明の実施例を示すブロツク図で、
１はマイクロコンピユータであり、たとえば本発
明を実施する上・下水道設備に設けられたコンピ
ユータの一部を利用することができる。２は電動
弁、３は流量検出、器、Rsは設定流量、Raは前
記流量検出器３の実測流量、４は設定流量Rs、
５は設定流量Rsと実測流量Raに入力し、電動弁
２の弁開指令６を出力する演算部、７は設定流量
と実測流量との流量偏差ｅ検出する比較器、８は
前記流量偏差ｅを入力し、各単位動作の動作時間
Taと停止時間Tbを演算する時間設定部、９は時
間設定部８の演算に必要な要素を記憶しておく記
憶部、１０は演算部５の弁指令６と時間設定部８
の出力により電動部２を動作させるインタラプタ
部である。 FIG. 3 is a block diagram showing an embodiment of the present invention.
Reference numeral 1 denotes a microcomputer, and for example, a part of a computer installed in a water supply/sewage system implementing the present invention can be used. 2 is an electric valve, 3 is a flow rate detector, Rs is a set flow rate, Ra is an actual flow rate measured by the flow rate detector 3, 4 is a set flow rate Rs,
5 is a calculation unit that inputs the set flow rate Rs and the measured flow rate Ra and outputs the valve opening command 6 for the electric valve 2; 7 is a comparator that detects the flow rate deviation e between the set flow rate and the measured flow rate; and 8 is the flow rate deviation e. Enter the operation time of each unit operation.
A time setting section that calculates Ta and stop time Tb; 9 a storage section that stores elements necessary for the calculation of the time setting section 8; 10 a valve command 6 of the calculation section 5 and the time setting section 8;
This is an interrupter section that operates the electric section 2 by the output of the .
まず、安全と保守を考慮し当該制御プロセスに
おける１回の単位動作として許容される最大動作
時間Tamを実測または推定によつて定め、電動
弁２を最大動作時間Tamで開いたときの動作完
了時から実際の流量が整定するまでの時間を最大
停止時間Tbmとして実測する。この場合、実測
流量の初期値が異なる状態で数回実測した平均値
をとることが望ましい。 First, in consideration of safety and maintenance, the maximum operation time Tam allowed for one unit operation in the control process is determined by actual measurement or estimation, and the operation is completed when the electric valve 2 is opened for the maximum operation time Tam. The time from when the actual flow rate settles is measured as the maximum stop time Tbm. In this case, it is desirable to take the average value of several measurements with different initial values of the measured flow rate.
つぎに、インタラプタを最大動作時間Tamと
最大停止時間Tbmで動作させてもオーバーシユ
ートを生じるおそれがない流量範囲、たとえば最
大動作時間と最大停止時間による１回の流量Rm
よりも大きい値の境界流量偏差ecを設定し、設定
流量Rsからこの境界流量偏差ecの範囲除いた流
量値Rc以下の範囲を固定するインタラプタ範囲
Ｃとして設定する。 Next, consider the flow rate range in which there is no risk of overshoot even if the interrupter is operated with the maximum operating time Tam and the maximum stopping time Tbm, for example, the flow rate Rm for one time depending on the maximum operating time and maximum stopping time.
A boundary flow rate deviation e c is set to a value larger than , and a range below the flow rate value Rc, which is obtained by subtracting the range of this boundary flow rate deviation e c from the set flow rate Rs, is set as an interrupter range C to be fixed.
記憶部９には、前記記最大動作時間Tam、最
大停止時間Tbm、境界流量偏差ecが記憶される
とともに、最大動作時間Tamに前記境界流量偏
差ecの逆数を乗じた値を流量−動作時間変換係数
Ｋとして、また最大停止時間Tbmに最大動作時
間Tamの逆数を乗じた値を最適時間比率Ｐとし
て記憶させる。 The storage unit 9 stores the maximum operating time Tam, the maximum stop time Tbm, and the boundary flow deviation e c , and calculates the value obtained by multiplying the maximum operation time Tam by the reciprocal of the boundary flow deviation e c as the flow rate - operation. A value obtained by multiplying the maximum stop time Tbm by the reciprocal of the maximum operation time Tam is stored as the time conversion coefficient K and as the optimum time ratio P.
設定流量４が設定されると、第４図のフローチ
ヤートに示すように、演算部５は設定流量Rsと
流量検出器３からの実測流量Raを比較し、Rsは
＞Raであれば弁開指令６を出力し、また比較器
７から流量偏差ｅが時間設定部８に入力される。 When the set flow rate 4 is set, the calculation unit 5 compares the set flow rate Rs with the measured flow rate Ra from the flow rate detector 3, and if Rs is > Ra, the valve is opened. A command 6 is output, and a flow rate deviation e is input from a comparator 7 to a time setting section 8.
時間設定部８は、この流量偏差ｅと境界流量偏
差ecを比較較し、ｅ＞cであれば、実際の流量が
固定インタラプタ領域Ｃ内にあると判断し、動作
時間Taを最大動作時間Tamに、停止時間Tbを
最大停止時間Tbmに設定し、この時間設定によ
りインタラプタ部１０は電動弁２を時間Tamだ
け開動作を行ない、これに引きつづいて時間
Tbmだけそのときの開状態のまま停止させて１
回の単位動作が終る。第５図で時刻t0，t1 での
流量偏差e0，ｅ（の場合がこれに相当する。 The time setting unit 8 compares the flow rate deviation e with the boundary flow rate deviation e c , and if e> c , determines that the actual flow rate is within the fixed interrupter area C, and sets the operating time Ta to the maximum operating time. Tam, the stop time Tb is set to the maximum stop time Tbm, and with this time setting, the interrupter section 10 opens the electric valve 2 for a time Tam, and then continues for a time
Stop only Tbm in the open state at that time 1
The unit operation ends. This corresponds to the case of flow rate deviations e 0 and e( at times t 0 and t 1 in FIG. 5).
時間設定部８は１回の単位動作が終るたびに、
流量偏差ｅと境界流量偏差ecとを比較しており、
時刻t2で流量偏差e2が境界流量偏差ecより小さく
なつたことを検出すると、実際の流量が固定イン
タラプタ領域Ｃを越えたと判断し、この流量偏差
e2の絶対値に流量−動作時間変換係数Ｋを乗じた
値を動作時間Ta2とし、さらに最適時間比率Ｐを
乗じた値を停止時間Tb2としてインタラプタ部１
０に出力する。時刻t3では新たな流量偏差e3で同
様に演算処理を行なわせ、このような演算処理を
実測流量Raが設定流量Rsと一致し、流量偏差ｅ
が０になるか一致したとみなされる不感帯に入る
まで繰り返えす。 Each time one unit operation is completed, the time setting section 8
Comparing the flow rate deviation e and the boundary flow rate deviation e c ,
When it is detected that the flow rate deviation e 2 has become smaller than the boundary flow rate deviation e c at time t 2 , it is determined that the actual flow rate has exceeded the fixed interrupter area C, and this flow rate deviation
The value obtained by multiplying the absolute value of e 2 by the flow rate-operating time conversion coefficient K is set as the operating time Ta 2 , and the value further multiplied by the optimum time ratio P is set as the stop time Tb 2 , and the interrupter section 1
Output to 0. At time t3 , the same calculation process is performed with a new flow rate deviation e3 , and this calculation process is performed until the measured flow rate Ra matches the set flow rate Rs and the flow rate deviation e
This process can be repeated until it reaches 0 or enters a dead zone where it is considered a match.
なお、前記実施例では固定インタラプタ領域Ｃ
を設定し、この領域内の動作時間は一定にし、設
定流量Rsから１回の最大動作時間で与えられる
流量よりも大きな流量差の範囲内でのみインタラ
プタの動作時間を調整するようにしてあるが、操
作時間に余裕があるときは、境界流量偏差ecを設
定流量Rsと等しく設定して固定インタラプタ領
域Ｃを実質的になくして判御してもよい。また、
電動弁を閉じるように制御する場合も本発明を同
様に実施しうることは明らかである。 In the above embodiment, the fixed interrupter area C
is set, the operating time within this region is kept constant, and the interrupter operating time is adjusted only within the range of a flow rate difference larger than the flow rate given by the maximum operating time of one time from the set flow rate Rs. If there is sufficient operating time, the boundary flow rate deviation e c may be set equal to the set flow rate Rs to substantially eliminate the fixed interrupter region C. Also,
It is clear that the present invention can be implemented in the same manner when controlling the electric valve to close.
このように本発明は、設定流量Rsと実測流量
Raを入力して電動弁の開、停止、閉の動作を指
令する演算部と、からかじめ実測または推定した
インタラプタの最大動作時間Tam、および最大
停止時間Tbmを記憶し、１回の単位動作ごとに
流量偏差ｅを検出して、この流量偏差ｅが境界流
量偏差ecより大きいときはインタラプタの動作時
間を最大動作時間と最大停止時間に設定し、流量
偏差ｅが境界流量偏差ecより小さくなつたときは
流量偏差ｅに流量一動作時間変換係数Ｋを乗じて
動作時間Taとし、この動作時に最適時間比率Ｐ
を乗じて停止時間Tbを設定するようにしてある
から、各単位動作での流量の整定が確実に行なわ
れ、流量偏差の検出が正確になり、この流量偏差
が小さくなり、設定流量に近づくにしたがつて動
作時間を短縮して流量変化が小さくなり、流量を
なめらかにかつオーバーシユートを生ずることな
く制御することができ、操作に要する時間も短縮
される効果があり、操作端の故障が管系に不当な
影響を与えることがなく、信頼性の高い制御を行
なうことができる。 In this way, the present invention allows the set flow rate Rs and the measured flow rate to be
A calculation unit inputs Ra to command the opening, stopping, and closing operations of the electric valve, and stores the maximum operation time Tam and maximum stop time Tbm of the interrupter, which were actually measured or estimated in advance, and performs one unit operation. If the flow rate deviation e is larger than the boundary flow deviation e c , the interrupter operating time is set to the maximum operating time and maximum stop time, and the flow deviation e is larger than the boundary flow deviation e c . When the flow rate deviation e becomes smaller, the flow rate deviation e is multiplied by the flow rate-to-operation time conversion coefficient K to obtain the operation time Ta, and the optimum time ratio P during this operation is calculated.
Since the stop time Tb is set by multiplying by Therefore, the operating time is shortened, the flow rate change is small, the flow rate can be controlled smoothly and without overshoot, the time required for operation is also shortened, and failure of the operating end is prevented. Highly reliable control can be performed without unduly affecting the pipe system.
第１図および第２図は従来の実施例を示す制御
特性図、第３図は本発明の実施例を示すブロツク
図、第４図はそのフローチヤート、第５図は制御
特性図である。
１はマイクロコンピユータ、２は電動弁、３は
流量検出器、４は設定流量、５は演算部、７は比
較器、８は時間設定部、９は記憶部、１０はイン
タラプタ部、Taは動作時間、Tbは停止時間、
Tamは最大動作時間、Tbmは最大停止時間、Rs
は設定流量、Raは実測流量、ｅは流量偏差ｅ、
ecは境界流量偏差、Ｃは固定インタラプタ領域で
ある。
1 and 2 are control characteristic diagrams showing a conventional embodiment, FIG. 3 is a block diagram showing an embodiment of the present invention, FIG. 4 is a flowchart thereof, and FIG. 5 is a control characteristic diagram. 1 is a microcomputer, 2 is an electric valve, 3 is a flow rate detector, 4 is a set flow rate, 5 is a calculation section, 7 is a comparator, 8 is a time setting section, 9 is a storage section, 10 is an interrupter section, Ta is an operation time, Tb is the stop time,
Tam is maximum operating time, Tbm is maximum stopping time, Rs
is the set flow rate, Ra is the measured flow rate, e is the flow rate deviation e,
e c is the boundary flow deviation and C is the fixed interrupter region.
Claims (1)
応じて電動弁の開、停止、閉の動作を指令する演
算部５と、電動弁の動作時間Taと停止時間Tbを
設定する時間設定部８とをそなえ、あらかじめ実
測または推定したインタラプタの最大動作時間
Tamおよび最大停止時間Tbmと、前記最大動作
時間および最大停止時間によるインタラプタの１
回の単位動作で与えられる流量Rmよりも大きい
値の境界流量偏差ecと、最大動作時間Tamに境
界流量偏差ecの逆数を乗じた流量−動作時間変換
係数Ｋ、および最大停止時間Tbmに最大動作時
間Tamの逆数を乗じた最適時間比率Ｐとを記憶
したマイクロコンピユータ１を設け、 このマイクロコンピユータにより、インタラプ
タの１回の単位動作ごとに流量偏差ｅを前記境界
流量偏差ecと比較し、ｅ≧ecのときはインタラプ
タの動作時間を最大動作時間と最大停止時間に設
定し、ｅ＜ecのときは流量偏差ｅに流量−動作時
間変換係数Ｋを乗じて動作時間Taとし、この動
作時間に最適時間比率Ｐを乗じて停止時間Tbを
設定するようにしたことを特徴とする流量制御装
置。 ２ 前記境界流量偏差ecが設定流量Rsに等しく
設定された特許請求の範囲第１項記載の流量制御
装置。[Claims] 1. A calculation unit 5 that commands the opening, stopping, and closing operations of the motor-operated valve according to the flow rate deviation e between the set flow rate Rs and the measured flow rate Ra, and the operation time Ta and stop time Tb of the motor-operated valve. A time setting section 8 is provided to set the maximum operating time of the interrupter, which is actually measured or estimated in advance.
1 of the interrupter based on Tam and maximum stop time Tbm and the maximum operation time and maximum stop time
The boundary flow rate deviation e c is larger than the flow rate Rm given in one unit operation, the flow rate-operation time conversion coefficient K is the maximum operation time Tam multiplied by the reciprocal of the boundary flow rate deviation e c , and the maximum stop time Tbm. A microcomputer 1 is provided which stores an optimal time ratio P multiplied by the reciprocal of the maximum operation time Tam, and this microcomputer compares the flow rate deviation e with the boundary flow rate deviation e c for each unit operation of the interrupter. , when e≧e c , set the interrupter operating time to the maximum operating time and maximum stop time, and when e<e c , set the operating time Ta by multiplying the flow rate deviation e by the flow rate-operating time conversion coefficient K, A flow control device characterized in that the stop time Tb is set by multiplying this operating time by an optimum time ratio P. 2. The flow rate control device according to claim 1, wherein the boundary flow rate deviation e c is set equal to the set flow rate Rs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8689582A JPS58203522A (en) | 1982-05-21 | 1982-05-21 | Controlling device of flow rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8689582A JPS58203522A (en) | 1982-05-21 | 1982-05-21 | Controlling device of flow rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58203522A JPS58203522A (en) | 1983-11-28 |
| JPH0330886B2 true JPH0330886B2 (en) | 1991-05-01 |
Family
ID=13899564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8689582A Granted JPS58203522A (en) | 1982-05-21 | 1982-05-21 | Controlling device of flow rate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58203522A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60169473U (en) * | 1984-04-20 | 1985-11-09 | 株式会社ノーリツ | Water flow control device |
| JPS6446079A (en) * | 1987-08-14 | 1989-02-20 | Seibu Electric & Machinery Co | Controlling system for valve opening/closing of valve driving actuator |
-
1982
- 1982-05-21 JP JP8689582A patent/JPS58203522A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58203522A (en) | 1983-11-28 |
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