JPH11194832A - Flow rate control method - Google Patents

Flow rate control method

Info

Publication number
JPH11194832A
JPH11194832A JP118498A JP118498A JPH11194832A JP H11194832 A JPH11194832 A JP H11194832A JP 118498 A JP118498 A JP 118498A JP 118498 A JP118498 A JP 118498A JP H11194832 A JPH11194832 A JP H11194832A
Authority
JP
Japan
Prior art keywords
value
flow rate
correction
deviation
unit period
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
Application number
JP118498A
Other languages
Japanese (ja)
Other versions
JP3523997B2 (en
Inventor
Tetsuya Nagao
哲也 長尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP00118498A priority Critical patent/JP3523997B2/en
Publication of JPH11194832A publication Critical patent/JPH11194832A/en
Application granted granted Critical
Publication of JP3523997B2 publication Critical patent/JP3523997B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Feedback Control In General (AREA)
  • Flow Control (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

PROBLEM TO BE SOLVED: To always accurately control flow rte without needing manual adjustment operation by correcting periodic target flow rate value for every correction unit period based on an error between measured total flow rate value as total quantity that actually flowed in the past control unit period and total flow rate plan value. SOLUTION: The target correction deviation Esv is calculated from the error between measured total flow rate TPVc and total flow rare plan value TSVn (St1). Whether or not to correct cyclic target flow rte value SVn with the deviation Esv is judged and when correction is performed (St2), the deviation Esv is added to the value SVn to correct periodic target flow rate value SVc (St3). Deviation E between the current flow rate value PV that is acquired by real measurement and corrected cyclic target flow rate value SVn is calculated (St4). The necessary opening degree of a valve in a sampling period in the next period is calculated by PID control with the calculated deviation E as a control index (St5) and the opening degree of the valve is operated as a flow rate control output (St6).

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、水道管路等におい
てバルブにより流量を制御する流量制御方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control method for controlling a flow in a water pipe or the like by a valve.

【0002】[0002]

【従来の技術】従来、図2に示すように、水道用管路系
1においては、上流の配水管路網における使用水量の増
減に起因して、下流の配水管路網に対する供給水量が変
動することを抑制し、一定の供給水量を確保することな
どを目的として、系の途中に流量を制御するバルブ2を
設けている。このバルブ2の開閉制御はコントローラ3
が行なっており、水道用管路系1を流れる水道水の瞬時
流量を流量計4で計測し、計測した流量値に基づいてコ
ントローラ3がバルブ2の開度を設定流量に見合うよう
に調整している。このコントローラ3によるバルブ2の
開閉制御は以下に示すものであった。
2. Description of the Related Art Conventionally, as shown in FIG. 2, in a water supply pipe system 1, the amount of water supplied to a downstream water distribution pipe network fluctuates due to an increase or decrease in the amount of water used in an upstream water distribution pipe network. A valve 2 for controlling the flow rate is provided in the middle of the system for the purpose of suppressing the amount of water supply and securing a constant amount of supplied water. The opening and closing control of this valve 2
The instantaneous flow rate of tap water flowing through the water pipe system 1 is measured by the flow meter 4, and the controller 3 adjusts the opening degree of the valve 2 to match the set flow rate based on the measured flow rate value. ing. The opening / closing control of the valve 2 by the controller 3 is as follows.

【0003】水道用管路系1における水量の制御におい
ては、制御単位期間を設定し、制御単位期間における総
流量計画値が一定となるように、バルブ2の開度を制御
して現在流量を調整している。
In controlling the amount of water in the water pipe system 1, a control unit period is set, and the opening degree of the valve 2 is controlled so that the total flow plan value in the control unit period is constant so that the current flow rate is controlled. I am adjusting.

【0004】以下に、制御単位期間を1日として総流量
計画値を設定し、制御指標となる現在流量値を計測する
ための計測単位時間としてのサンプリング周期を1時間
として設定する場合について説明する。
Hereinafter, a case will be described in which the total flow rate plan value is set with the control unit period as one day, and the sampling cycle as the measurement unit time for measuring the current flow rate value as a control index is set as one hour. .

【0005】始めに、制御単位期間である一日をサンプ
リング周期である1時間で除算して、制御単位期間の1
日におけるサンプリング回数(24)を求める。次に、
総流量計画値をサンプリング回数で除算して、サンプリ
ング周期の1時間における周期目標流量値を求める。
First, one day, which is the control unit period, is divided by one hour, which is the sampling period, to obtain one day of the control unit period.
The number of samplings per day (24) is determined. next,
The total flow plan value is divided by the number of times of sampling to obtain a cycle target flow value in one hour of the sampling cycle.

【0006】制御に際しては、現在のサンプリング周期
の1時間内に流れた流量として計測した現在流量値(m
3/h)と、先に求めた周期目標流量値(m3/h)との
偏差Eを求め、この偏差Eを制御指標としてPID演算
により、次期のサンプリング周期におけるバルブ2の開
度を算出している。
At the time of control, the current flow rate value (m) measured as the flow rate flowing within one hour of the current sampling cycle
3 / h) and a deviation E between the previously obtained periodic target flow rate value (m 3 / h) and the opening E of the valve 2 in the next sampling period is calculated by PID calculation using the deviation E as a control index. doing.

【0007】[0007]

【発明が解決しようとする課題】上記した従来の構成に
おいて、現在流量値(m3/h)には、脈流や急激な流
量の変化等の外乱、微少流量の変化に対する流量計4の
作動誤差(不感帯)等に起因して測定誤差が存在する。
In the above-described conventional configuration, the current flow rate value (m 3 / h) is controlled by the operation of the flow meter 4 in response to disturbances such as a pulsating flow or a sudden change in the flow rate, and a change in a minute flow rate. There is a measurement error due to an error (dead zone) or the like.

【0008】このために、測定誤差により、制御単位期
間である1日の総流量や1ヶ月の総流量合計において、
システムとしての制御誤差が発生し、制御誤差を修正す
るために、人為的な操作を定期的に行なう必要があっ
た。
For this reason, due to the measurement error, the total flow rate in one day or the total flow rate in one month, which is the control unit period,
A control error occurs as a system, and it is necessary to periodically perform an artificial operation to correct the control error.

【0009】本発明は上記した課題を解決するものであ
り、測定誤差に起因する制御誤差の発生を抑制し、人為
的な調整操作を必要とせずに、常に正確な流量制御を行
なうことができる流量制御方法を提供することを目的と
する。
The present invention has been made to solve the above-mentioned problem, and can suppress the occurrence of a control error due to a measurement error, and can always perform an accurate flow rate control without requiring an artificial adjustment operation. It is an object to provide a flow control method.

【0010】[0010]

【課題を解決するための手段】上記した課題を解決する
ために、本発明の流量制御方法は、管路系に設けたバル
ブの開度を、流量計により計測する流量値に基づいてコ
ントローラによって制御するものであって、コントロー
ラにおいて、制御単位期間Hnと、制御単位期間Hnに
おける総流量計画値TSVnと、流量を計測する計測単
位時間としてのサンプリング周期Tとを設定し、制御単
位期間Hnをサンプリング周期Tで除算してサンプリン
グ回数Sを求め、総流量計画値TSVnをサンプリング
回数Sで除算してサンプリング周期Tにおける目標流量
としての周期目標流量値SVnを求め、サンプリング周
期Tを単位時間とする修正単位期間Hcを設定し、現在
時刻を基準とした過去の制御単位期間Hnにおいて実計
測により得た計測総流量値TPVcと総流量計画値TS
Vnとの誤差値を求め、この誤差値を修正単位期間Hc
で除算して目標修正偏差Esvを求め、目標修正偏差E
svを周期目標流量値SVnに加算して周期目標流量値
SVcを補正し、この補正を修正単位期間Hcごとに行
ない、現サンプリング周期Tにおいて実計測により得た
現在流量値PVと補正した周期目標流量値SVnとの偏
差Eを制御指標として次期のサンプリング周期Tにおけ
るバルブの開度を算出する。
In order to solve the above-mentioned problems, a flow control method according to the present invention uses a controller to determine the degree of opening of a valve provided in a pipeline based on a flow value measured by a flow meter. The controller sets a control unit period Hn, a total flow plan value TSVn in the control unit period Hn, and a sampling cycle T as a measurement unit time for measuring the flow rate, and sets the control unit period Hn. The number of samplings S is obtained by dividing by the sampling period T, and the total flow plan value TSVn is divided by the number of samplings S to obtain the periodic target flow value SVn as the target flow in the sampling period T, and the sampling period T is set as a unit time. A correction unit period Hc is set, and measurement obtained by actual measurement in a past control unit period Hn based on the current time Flow rate value TPVc and the total flow rate plan value TS
An error value from Vn is obtained, and this error value is used as the correction unit period Hc
To obtain the target correction deviation Esv, and the target correction deviation E
sv is added to the periodic target flow value SVn to correct the periodic target flow value SVc, and the correction is performed for each correction unit period Hc, and the corrected periodic target value is compared with the current flow value PV obtained by actual measurement in the current sampling period T. The valve opening in the next sampling cycle T is calculated using the deviation E from the flow value SVn as a control index.

【0011】[0011]

【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図2において説明したものと同様
の作用を行なうものは、同一番号を付して説明を省略す
る。図1は本実施形態における制御の手順を示すフロー
チャート図であり、以下に図1に基づいて説明する。
Embodiments of the present invention will be described below with reference to the drawings. Components performing the same operations as those described with reference to FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. FIG. 1 is a flowchart illustrating a control procedure according to the present embodiment, which will be described below with reference to FIG.

【0012】水道用管路系1を流れる流量を制御するに
際し、流量計4により計測する流量値に基づいてコント
ローラ3によりバルブ2の開度を制御する。このため
に、コントローラ3に、制御を行なう時間的な単位とし
ての制御単位期間Hnと、制御単位期間Hnにおける総
流量計画値TSVnと、制御単位期間Hnにおいて流量
を計測する計測単位時間としてのサンプリング周期Tと
を基本データとして設定する。本実施の形態において
は、制御単位期間Hnを1日とし、サンプリング周期T
を1時間とする。
In controlling the flow rate flowing through the water pipe system 1, the controller 3 controls the opening of the valve 2 based on the flow rate value measured by the flow meter 4. For this purpose, the controller 3 gives the controller 3 a control unit period Hn as a time unit for performing control, a total flow plan value TSVn in the control unit period Hn, and a sampling as a measurement unit time for measuring the flow rate in the control unit period Hn. The period T is set as basic data. In the present embodiment, the control unit period Hn is one day, and the sampling period T
Is 1 hour.

【0013】次に、制御単位期間Hnである1日(24
時間)をサンプリング周期Tである1時間で除算するこ
とにより、制御単位期間Hnにおけるサンプリング回数
Sを求める。本実施の形態においては、サンプリング回
数Sは24回となる。総流量計画値TSVnをサンプリ
ング回数Sで除算することにより、サンプリング周期T
の1時間における制御の目標流量としての周期目標流量
値SVnを求め、周期目標流量値SVnを基本データと
して設定する。
Next, the control unit period Hn of one day (24
Is divided by 1 hour, which is the sampling period T, to obtain the number of samplings S in the control unit period Hn. In the present embodiment, the number of samplings S is 24. By dividing the total flow plan value TSVn by the number of sampling times S, the sampling period T
, A periodic target flow value SVn as a target flow of control in one hour is obtained, and the periodic target flow value SVn is set as basic data.

【0014】次に、制御誤差が発生した場合に、誤差を
修正するために要する時間として、サンプリング周期T
を単位時間とする修正単位期間Hcを設定する。本実施
の形態においては、修正単位期間Hcを例えば6時間と
する。
Next, when a control error occurs, the sampling period T
Is set as a correction unit period Hc. In the present embodiment, the correction unit period Hc is, for example, 6 hours.

【0015】実際の制御に際しては、実計測により得た
計測データを随時に記憶し、現サンプリング時の現在時
刻を基準とした過去24時間の制御単位期間Hnにおい
て実計測により得た計測総流量値TPVcを、記憶した
計測データから求め、計測総流量値TPVcと総流量計
画値TSVnとの誤差値を求める。この誤差値を修正単
位期間Hcで除算して目標修正偏差Esvを求める(S
t1)。
In actual control, measured data obtained by actual measurement is stored at any time, and the measured total flow rate value obtained by actual measurement in the past 24 hours of the control unit period Hn based on the current time at the time of the current sampling. TPVc is obtained from the stored measurement data, and an error value between the measured total flow value TPVc and the total flow plan value TSVn is obtained. This error value is divided by the correction unit period Hc to obtain a target correction deviation Esv (S
t1).

【0016】次に、周期目標流量値SVnを目標修正偏
差Esvで補正すべき否かを判断する(St2)。この
判断は、前回の補正から修正単位期間Hcである6時間
を経過したか否かを基準として行なう。
Next, it is determined whether or not the periodic target flow value SVn should be corrected by the target correction deviation Esv (St2). This determination is made based on whether or not six hours, which is the correction unit period Hc, has elapsed since the previous correction.

【0017】補正を行なう場合には、目標修正偏差Es
vを周期目標流量値SVnに加算して周期目標流量値S
Vcを補正する(St3)。この補正は修正単位期間H
cである6時間ごとに行なう。補正を行なった後、もし
くは補正を行なわない場合に、次の処理を行なう。
When performing correction, the target correction deviation Es
v is added to the periodic target flow value SVn to obtain the periodic target flow value S
Vc is corrected (St3). This correction is a correction unit period H
Perform every 6 hours, which is c. After the correction is performed or when the correction is not performed, the following processing is performed.

【0018】現サンプリング周期Tにおいて実計測によ
り得た現在流量値PVと補正した周期目標流量値SVn
との偏差Eを算出する(St4)。算出した偏差Eを制
御指標としてPID制御により、次期のサンプリング周
期Tにおけるバルブ2の必要開度を算出し(St5)、
算出した値を流量制御出力としてバルブ2の開度を操作
する。
The current flow value PV obtained by actual measurement in the current sampling period T and the corrected periodic target flow value SVn
Is calculated (St4). The required opening of the valve 2 in the next sampling cycle T is calculated by the PID control using the calculated deviation E as a control index (St5),
The opening of the valve 2 is operated using the calculated value as the flow control output.

【0019】[0019]

【発明の効果】以上述べたように本発明によれば、コン
トローラが、過去の制御単位期間Hnにおいて実際に流
れた総量としての計測総流量値TPVcと総流量計画値
TSVnとの誤差に基づいて、周期目標流量値SVnを
修正単位期間Hcごとに補正するので、制御単位期間H
nの間において実際に流れる総量を総流量計画値TSV
に常に一致させることができ、人為的な調整や運用計画
の変更が不要となる。
As described above, according to the present invention, the controller determines the total flow rate TPVc as the total flow amount actually flowing in the past control unit period Hn and the total flow plan value TSVn based on the error. , The periodic target flow value SVn is corrected for each correction unit period Hc.
n, the total amount actually flowing during the period n
, So that there is no need for artificial adjustments or changes in the operation plan.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施の形態における制御の手順を示す
フローチャート図である。
FIG. 1 is a flowchart illustrating a control procedure according to an embodiment of the present invention.

【図2】水道用管路系における制御手段の構成を示す摸
式図である。
FIG. 2 is a schematic diagram showing a configuration of a control means in a water pipe system.

【符号の説明】[Explanation of symbols]

1 水道用管路系 2 バルブ 3 コントローラ 4 流量計 DESCRIPTION OF SYMBOLS 1 Water supply pipe system 2 Valve 3 Controller 4 Flow meter

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 管路系に設けたバルブの開度を、流量計
により計測する流量値に基づいてコントローラによって
制御するものであって、 コントローラにおいて、制御単位期間Hnと、制御単位
期間Hnにおける総流量計画値TSVnと、流量を計測
する計測単位時間としてのサンプリング周期Tとを設定
し、制御単位期間Hnをサンプリング周期Tで除算して
サンプリング回数Sを求め、総流量計画値TSVnをサ
ンプリング回数Sで除算してサンプリング周期Tにおけ
る目標流量としての周期目標流量値SVnを求め、 サンプリング周期Tを単位時間とする修正単位期間Hc
を設定し、現在時刻を基準とした過去の制御単位期間H
nにおいて実計測により得た計測総流量値TPVcと総
流量計画値TSVnとの誤差値を求め、この誤差値を修
正単位期間Hcで除算して目標修正偏差Esvを求め、
目標修正偏差Esvを周期目標流量値SVnに加算して
周期目標流量値SVcを補正し、この補正を修正単位期
間Hcごとに行ない、 現サンプリング周期Tにおいて実計測により得た現在流
量値PVと補正した周期目標流量値SVnとの偏差Eを
制御指標として次期のサンプリング周期Tにおけるバル
ブの開度を算出することを特徴とする流量制御方法。
An opening degree of a valve provided in a pipeline system is controlled by a controller based on a flow rate value measured by a flow meter. The controller controls a control unit period Hn and a control unit period Hn. The total flow plan value TSVn and the sampling period T as a measurement unit time for measuring the flow rate are set, and the control unit period Hn is divided by the sampling period T to obtain the number of samplings S. S is divided by S to obtain a cycle target flow rate value SVn as a target flow rate in the sampling cycle T, and a correction unit period Hc using the sampling cycle T as a unit time.
Is set, and a past control unit period H based on the current time is set.
n, an error value between the measured total flow value TPVc obtained by actual measurement and the total flow plan value TSVn is obtained, and this error value is divided by the correction unit period Hc to obtain a target correction deviation Esv,
The target correction deviation Esv is added to the periodic target flow value SVn to correct the periodic target flow value SVc, and the correction is performed for each correction unit period Hc. The correction is made with the current flow value PV obtained by actual measurement in the current sampling period T. A flow control method comprising: calculating a valve opening in a next sampling cycle T using a deviation E from the cycle target flow value SVn as a control index.
JP00118498A 1998-01-07 1998-01-07 Flow control method Expired - Fee Related JP3523997B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP00118498A JP3523997B2 (en) 1998-01-07 1998-01-07 Flow control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP00118498A JP3523997B2 (en) 1998-01-07 1998-01-07 Flow control method

Publications (2)

Publication Number Publication Date
JPH11194832A true JPH11194832A (en) 1999-07-21
JP3523997B2 JP3523997B2 (en) 2004-04-26

Family

ID=11494376

Family Applications (1)

Application Number Title Priority Date Filing Date
JP00118498A Expired - Fee Related JP3523997B2 (en) 1998-01-07 1998-01-07 Flow control method

Country Status (1)

Country Link
JP (1) JP3523997B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112254311A (en) * 2020-10-14 2021-01-22 珠海格力电器股份有限公司 Control method of electronic expansion valve and air conditioner
CN114726648A (en) * 2022-05-12 2022-07-08 北京国信网联科技有限公司 Terminal security cloud control system based on Internet of things
CN117949068A (en) * 2024-03-26 2024-04-30 博莱阀门(常州)有限公司 Error correction method and device for flowmeter for valve flow test
CN117949068B (en) * 2024-03-26 2024-05-31 博莱阀门(常州)有限公司 Error correction method and device for flowmeter for valve flow test

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112254311A (en) * 2020-10-14 2021-01-22 珠海格力电器股份有限公司 Control method of electronic expansion valve and air conditioner
CN112254311B (en) * 2020-10-14 2021-10-08 珠海格力电器股份有限公司 Control method of electronic expansion valve and air conditioner
CN114726648A (en) * 2022-05-12 2022-07-08 北京国信网联科技有限公司 Terminal security cloud control system based on Internet of things
CN114726648B (en) * 2022-05-12 2022-08-23 北京国信网联科技有限公司 Terminal security cloud control system based on Internet of things
CN117949068A (en) * 2024-03-26 2024-04-30 博莱阀门(常州)有限公司 Error correction method and device for flowmeter for valve flow test
CN117949068B (en) * 2024-03-26 2024-05-31 博莱阀门(常州)有限公司 Error correction method and device for flowmeter for valve flow test

Also Published As

Publication number Publication date
JP3523997B2 (en) 2004-04-26

Similar Documents

Publication Publication Date Title
CN101978132B (en) Method and apparatus for in situ testing of gas flow controllers
US5902927A (en) Fluid metering apparatus and method
EA035473B1 (en) Method for controlling a flow of a proportional valve of ventilator
CN112382427A (en) Liquid level control method and system for nuclear power plant evaporator
JP3523997B2 (en) Flow control method
CN113251192B (en) Digital valve control system and control method by considering valve response time
WO2021128872A1 (en) Method for automatically calculating and adding liquid in electrophoresis tank of electrophoretic coating line
CN112540629A (en) Intelligent valve flow calibration method and device
CN110611544A (en) Method and device for accurately timing by utilizing RS232 serial port
BG107801A (en) Method of and system for controlling the ratio of a variable lead parameter and an adjustable lag parameter for a lag-lead process
CN113987404B (en) Flow valve opening degree adjusting method and system based on parameter updating correction
JP5578940B2 (en) Voltage control device
JPH09287550A (en) Ion engine device
CN111442876A (en) Intelligent transmitter checking system
RU32143U1 (en) Accounting and regulatory complex of heat consumption
JP2004046631A (en) Water valve controller
CN114249415B (en) Accurate aeration device and method
JP2532920Y2 (en) Valve control device with built-in electronic control device
CN117225659B (en) Automatic chip process deviation recognition and correction method and system
JP2000111043A (en) Gas safety apparatus
JPH01237805A (en) Flow rate controller
JP2023168986A (en) Control device
JP2021159900A (en) Mixed gas supply device and method
JPH1047654A (en) Air ratio automatic correcting system for combustion equipment
JP3506040B2 (en) Gas security equipment

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20031218

A01 Written decision to grant a patent or to grant a registration (utility model)

Effective date: 20040113

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Effective date: 20040210

Free format text: JAPANESE INTERMEDIATE CODE: A61

LAPS Cancellation because of no payment of annual fees