JP2816007B2 - Control device for absorption refrigerator - Google Patents
Control device for absorption refrigeratorInfo
- Publication number
- JP2816007B2 JP2816007B2 JP26251990A JP26251990A JP2816007B2 JP 2816007 B2 JP2816007 B2 JP 2816007B2 JP 26251990 A JP26251990 A JP 26251990A JP 26251990 A JP26251990 A JP 26251990A JP 2816007 B2 JP2816007 B2 JP 2816007B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid level
- liquid
- absorption
- absorbent
- pump
- 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 - Fee Related
Links
- 238000010521 absorption reaction Methods 0.000 title claims description 75
- 239000007788 liquid Substances 0.000 claims description 167
- 230000002745 absorbent Effects 0.000 claims description 64
- 239000002250 absorbent Substances 0.000 claims description 64
- 230000008859 change Effects 0.000 claims description 27
- 239000003507 refrigerant Substances 0.000 claims description 11
- 239000006096 absorbing agent Substances 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000243 solution Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Landscapes
- Sorption Type Refrigeration Machines (AREA)
Description
【発明の詳細な説明】 (イ)産業上の利用分野 本発明は、吸収液ポンプを備えた吸収冷凍機の制御装
置に関する。The present invention relates to a control device for an absorption refrigerator equipped with an absorption liquid pump.
(ロ)従来の技術 例えば特開昭62−84267号公報には、高温発生器の液
面を検出し、吸収器から発生器へ至る溶液流路に設けた
吸収液ポンプの吐出量を制御する制御装置を備えた吸収
冷凍機が開示されている。(B) Prior art For example, Japanese Patent Application Laid-Open No. Sho 62-84267 discloses a technique in which the liquid level of a high-temperature generator is detected, and the discharge rate of an absorbent pump provided in a solution flow path from an absorber to the generator is controlled. An absorption refrigerator equipped with a control device is disclosed.
(ハ)発明が解決しようとする課題 上記従来の技術において、急激な負荷変動、冷却水温
度の変動、吸収冷凍機の起動、及び停止のときの吸収液
ポンプの制御の追従性が悪く、例えば高温発生器の液面
高で吸収液ポンプが停止したり、液面低で吸収冷凍機が
異常停止するおそれがあった。(C) Problems to be Solved by the Invention In the above-described conventional technology, rapid follow-up of the control of the absorbing liquid pump at the time of sudden load fluctuation, fluctuation of cooling water temperature, starting and stopping of the absorption chiller is poor. The absorption liquid pump may stop when the liquid level of the high temperature generator is high, or the absorption refrigerator may stop abnormally when the liquid level is low.
本発明は、吸収冷凍機の起動、停止、或いは急激な負
荷変動に対して発生器の液面を一定に保つ応答性が良い
吸収冷凍機の制御装置を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a control device of an absorption refrigerator having good responsiveness for keeping the liquid level of a generator constant with respect to starting, stopping, or abrupt load fluctuation of the absorption refrigerator.
(ニ)課題を解決するための手段 本発明は上記課題を解決するために、吸収器(5)か
ら高温発生器(1)に至る稀吸収液配管(10)に吸収液
ポンプ(6)を設けた吸収冷凍機において、高温発生器
(1)に設けられた液面検出器(24)と、この液面検出
器(24)が検出した吸収液液面と設定値とを比較してフ
ァジィ論理演算によって吸収液ポンプ(6)に供給され
る電力の周波数を制御するマイコン制御盤(23)を備え
た吸収冷凍機の制御装置を提供するものである。(D) Means for Solving the Problems In order to solve the above problems, the present invention provides an absorbent pump (6) for a diluted absorbent pipe (10) from an absorber (5) to a high-temperature generator (1). In the provided absorption refrigerator, the liquid level detector (24) provided in the high-temperature generator (1) is compared with the set level by the liquid level detector (24) and the set level. An object of the present invention is to provide a control device for an absorption refrigerator including a microcomputer control panel (23) for controlling the frequency of electric power supplied to the absorbent pump (6) by a logical operation.
又、高温発生器(1)の吸収液液面を検出する液面検
出器(24)と、液面検出器(24)が検出した吸収液液面
の設定値からの偏差と吸収液液面の変化率とメンバー・
シップ関数と、ファジィ・ルールとに基づいてファジィ
論理演算によって吸収液ポンプ(6)に供給される電力
の周波数を制御し、吸収液ポンプ(6)の回転数を調節
するマイコン制御盤(23)とを備えた吸収冷凍機の制御
装置を提供するものである。Also, a liquid level detector (24) for detecting the liquid level of the absorbing liquid of the high-temperature generator (1), a deviation from the set value of the liquid level detected by the liquid level detector (24), and the liquid level of the liquid absorbing liquid. Rate of change and members
A microcomputer control panel (23) for controlling the frequency of electric power supplied to the absorbent pump (6) by fuzzy logic operation based on the ship function and the fuzzy rule, and adjusting the rotation speed of the absorbent pump (6) And a control device for the absorption refrigerator having the following.
又、吸収液を加熱して冷媒蒸気を分離する高温発生器
(1)を備えた吸収冷凍機において、高温発生器(1)
の吸収液液面を検出する液面検出器(24)と、この液面
検出器(24)が検出した吸収液液面に基づく値をメンバ
ー・シップ関数に代入してファジィ論理演算を行いこの
演算結果によって上記吸収液液面を一定に保つマイコン
制御盤(23)とを備えた吸収冷凍機の制御装置を提供す
るものである。In addition, in an absorption refrigerator having a high-temperature generator (1) for heating an absorption liquid to separate refrigerant vapor, the high-temperature generator (1)
A liquid level detector (24) for detecting the liquid level of the absorbent and a value based on the liquid level detected by the liquid level detector (24) are substituted into a membership function to perform a fuzzy logic operation. It is an object of the present invention to provide a control device for an absorption refrigerator including a microcomputer control panel (23) for keeping the liquid level of the absorbing liquid constant according to a calculation result.
(ホ)作用 吸収冷凍機の運転時、冷凍負荷又は冷却水温度が変化
して高温発生器(1)の加熱量が変化し、それに伴い、
高温発生器(1)の吸収液液面が変化した場合には、マ
イコン制御盤(23)で吸収液液面と設定値とを比較して
人間の経験に基づいてファジィ論理演算が行われ、吸収
液液面が大幅に変化したときには吸収液ポンプ(6)に
供給される電力の周波数も大幅に変化させ、吸収液ポン
プ(6)の吸収液の吐出量を変化させ、高温発生器
(1)の吸収液液面をほぼ一定に保つことが可能にな
る。(E) Action During operation of the absorption refrigerator, the refrigeration load or the cooling water temperature changes, and the heating amount of the high temperature generator (1) changes.
When the liquid level of the absorbent in the high-temperature generator (1) changes, the microcomputer control panel (23) compares the liquid level with the set value and performs fuzzy logic operation based on human experience. When the level of the absorbing liquid changes significantly, the frequency of the electric power supplied to the absorbing liquid pump (6) is also greatly changed, and the discharge amount of the absorbing liquid from the absorbing liquid pump (6) is changed. ) Makes it possible to keep the level of the absorbing liquid substantially constant.
又、吸収液液面の例えば設定値からの偏差及び変化率
とメンバー・シップ関数とファジィ・ルールとによって
ファジィ論理演算が行われ、この演算結果によって例え
ば吸収液ポンプ(6)に供給される電力の周波数が制御
され、人間の経験に基づいて高温発生器(1)へ送られ
る吸収液の量を適切に制御することができ、冷凍負荷、
或いは冷却水入口温度の変化に対して応答性が早く吸収
液液面を一定に保つ制御装置を提供することが可能にな
る。Also, a fuzzy logic operation is performed by a deviation and a change rate of the liquid level of the absorbing liquid from a set value, a membership function, and a fuzzy rule, for example. Is controlled, and the amount of the absorbing solution sent to the high temperature generator (1) can be appropriately controlled based on human experience, and the refrigeration load,
Alternatively, it is possible to provide a control device which has a quick response to a change in the cooling water inlet temperature and maintains the liquid level of the absorbing liquid constant.
(ヘ)実施例 以下、本発明の一実施例を図面に基づいて詳細に説明
する。(F) Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第1図は、冷媒に水、吸収剤(溶液)に臭化リチウム
(LiBr)水溶液を使用した二重効用吸収冷凍機を示し、
(1)はバーナー(1B)を備えた高温発生器、(2)は
低温発生器、(3)は凝縮器、(4)は蒸発器、(5)
は吸収器、(6)は吸収液ポンプ、(6A)は吸収液ポン
プ(6)へ所定の周波数の電力を供給するインバータ装
置、(7),(8)はそれぞれ低温熱交換器及び高温熱
交換器、(10)は稀吸収液配管、(11)は中間吸収液配
管、(12)は濃吸収液配管、(13)は冷媒配管、(14)
は冷媒液流下管、(15)は冷媒液循環管であり、それぞ
れは第1図に示したように接続されている。そして、冷
媒循環管(15)の途中に冷媒ポンプ(15P)が設けられ
ている。又、(16)はバーナー(1B)に接続された燃料
供給管であり、この燃料供給管(16)の途中に燃料制御
弁(17)が設けられている。又、(20)は冷水配管であ
り、この冷水配管(20)の途中に蒸発器熱交換器(21)
が設けられている。さらに(22)は冷却水配管である。FIG. 1 shows a double effect absorption refrigerator using water as a refrigerant and an aqueous solution of lithium bromide (LiBr) as an absorbent (solution),
(1) a high temperature generator with a burner (1B), (2) a low temperature generator, (3) a condenser, (4) an evaporator, (5)
Is an absorber, (6) is an absorption liquid pump, (6A) is an inverter device for supplying electric power of a predetermined frequency to the absorption liquid pump (6), (7) and (8) are a low-temperature heat exchanger and a high-temperature heat respectively. Exchanger, (10) is a diluted absorbent pipe, (11) is an intermediate absorbent pipe, (12) is a concentrated absorbent pipe, (13) is a refrigerant pipe, (14)
Is a refrigerant liquid downflow pipe, and (15) is a refrigerant liquid circulation pipe, each of which is connected as shown in FIG. A refrigerant pump (15P) is provided in the middle of the refrigerant circulation pipe (15). Reference numeral (16) denotes a fuel supply pipe connected to the burner (1B). A fuel control valve (17) is provided in the fuel supply pipe (16). Also, (20) is a chilled water pipe, and an evaporator heat exchanger (21) is provided in the middle of the chilled water pipe (20).
Is provided. Further, (22) is a cooling water pipe.
(23)は吸収冷凍機のマイコン制御盤、(24)は高温
発生器(1)に設けられた液面検出器であり、この液面
検出器(24)、及び吸収液ポンプ(6)、インバータ装
置(6A)とマイコン制御盤(23)とが接続されている。
そして、マイコン制御盤(23)は高温発生器(1)の吸
収液液位に基づいてファジィ推論を実行するマイクロプ
ロセッサ(25)と吸収液ポンプ(6)の制御装置(26)
とが設けられている。そして、マイクロプロセッサ(2
5)はファジィ推論プロセッサ(演算装置)(27)と制
御ルールの記憶装置(28)とから構成されている。ファ
ジィ推論プロセッサ(27)は吸収液液面の設定値からの
偏差を用いて吸収液ポンプ(26)に供給される電力の周
波数即ち操作量を論理演算し、得た操作量を制御装置
(26)へ出力する。制御装置(26)は上記操作量に基づ
いて吸収液ポンプ(6)に供給される電力の周波数を制
御する。この実施例ではファジィ推論プロセッサ(27)
から周波数を出力させている。又、制御ルールの記憶装
置(28)はファジィ推論プロセッサ(27)で実行される
ファジィ推論演算に必要な制御ルール、及びメンバー・
シップ関数を記憶する。又、(30)は演算装置であり、
演算装置(30)は液面検出器(24)の吸収液液面データ
を入力して設定値からの偏差を演算する。(23) is a microcomputer control panel of the absorption refrigerator, (24) is a liquid level detector provided in the high temperature generator (1), and the liquid level detector (24), the absorption liquid pump (6), The inverter device (6A) and the microcomputer control panel (23) are connected.
The microcomputer control panel (23) executes a fuzzy inference based on the liquid level of the high-temperature generator (1) and a control device (26) for the microprocessor (25) and the liquid pump (6).
Are provided. And the microprocessor (2
5) is composed of a fuzzy inference processor (arithmetic unit) (27) and a control rule storage unit (28). The fuzzy inference processor (27) performs a logical operation on the frequency of the electric power supplied to the absorbent pump (26), that is, the manipulated variable, using the deviation from the set value of the absorbent liquid level, and controls the obtained manipulated variable to the controller (26). ). The control device (26) controls the frequency of the electric power supplied to the absorbent pump (6) based on the operation amount. In this embodiment, a fuzzy inference processor (27)
Output the frequency. The control rule storage device (28) stores control rules necessary for the fuzzy inference operation executed by the fuzzy inference processor (27), and members,
Remember the ship function. Also, (30) is an arithmetic unit,
The arithmetic unit (30) inputs the absorption liquid level data of the liquid level detector (24) and calculates a deviation from a set value.
上記吸収液ポンプ(6)に供給される電力の周波数を
求めるファジィ論理演算は下記の制御ルール、及びメー
バー・シップ関数に基づいて実行される。以下人間の経
験に基づいて記憶装置(28)に記憶された制御ルール
(ファジィ・ルール)について説明する。The fuzzy logic operation for obtaining the frequency of the electric power supplied to the absorbent pump (6) is executed based on the following control rules and a membership function. Hereinafter, control rules (fuzzy rules) stored in the storage device (28) based on human experience will be described.
R1:吸収液液面が設定値よりかなり高いならば、即ち
吸収液液面の設定値からの偏差(eT0)がPB(Positive
Big:正に大)ならば操作量(KQ)、即ち周波数を直ちに
減少(NB)。R 1 : If the liquid level of the absorbent is considerably higher than the set value, that is, the deviation (eT 0 ) from the set value of the liquid level of the absorbent is PB (Positive)
If it is Big, the manipulated variable (KQ), that is, the frequency is immediately reduced (NB).
R2:吸収液液面が設定値よりやや高いならば、即ち偏
差(eT0)がPS(Positive Small:正に小)ならば、周波
数を徐々に減少(NS)。R 2 : If the liquid level of the absorbing solution is slightly higher than the set value, that is, if the deviation (eT 0 ) is PS (Positive Small), the frequency is gradually reduced (NS).
R3:吸収液液面が設定値と等しいならば、即ち偏差(e
T0)がZR(Zero:ゼロ)ならば、周波数をそのままに維
持(DR)。R 3 : If the absorbent level is equal to the set value, ie, the deviation (e
If T 0 ) is ZR (Zero: zero), the frequency is maintained as it is (DR).
R4:吸収液液面が設定値よりやや低いならば、即ち偏
差(eT0)がNS(Negative Small:負に小)ならば、周波
数を徐々に増加(PS)。R 4 : If the liquid level of the absorbing solution is slightly lower than the set value, that is, if the deviation (eT 0 ) is NS (Negative Small), the frequency is gradually increased (PS).
R5:吸収液液面が設定値よりかなり低いならば、即ち
偏差(eT0)がNB(Negative Big:負に大)ならば、周波
数を直ちに増加(PB)。R 5 : If the liquid level of the absorbing solution is considerably lower than the set value, that is, if the deviation (eT 0 ) is NB (negative big: negatively large), the frequency is immediately increased (PB).
上記R1〜R5が制御ルールであり、その制御ルールは第
3図に示したようになる。The R 1 to R 5 is a control rule, the control rule is as shown in Figure 3.
又、吸収液液面の設定値からの偏差の大きさを定性的
に評価するためのメンバー・シップ関数、即ち上記偏差
に対するファジィ変数PB,PS,ZR,NS,NBのメンバー・シッ
プ関数を第2図に示すように定義する。Also, a membership function for qualitatively evaluating the magnitude of the deviation from the set value of the absorbent liquid level, that is, the membership function of the fuzzy variables PB, PS, ZR, NS, NB for the above deviation is described as It is defined as shown in FIG.
又、定性的に評価された吸収液ポンプ(6)の操作量
を定量的な値に変換するためのメンバー・シップ関数、
即ち吸収液ポンプ(6)に供給される電力の周波数に対
するファジィ変数PB,PS,ZR,NS,NBのメンバー・シップ関
数を第4図に示すように定義する。A membership function for converting a qualitatively evaluated operation amount of the absorbent pump (6) into a quantitative value;
That is, the membership functions of the fuzzy variables PB, PS, ZR, NS and NB with respect to the frequency of the electric power supplied to the absorbing liquid pump (6) are defined as shown in FIG.
そして、第3図に示した制御ルールと、第2図及び第
4図に示したメンバー・シップ関数とを用いてファジィ
推論プロセッサ(27)にてファジィ論理演算が行われ、
吸収液ポンプ(6)の操作量が求められる。Then, a fuzzy logic operation is performed by the fuzzy inference processor (27) using the control rules shown in FIG. 3 and the membership functions shown in FIGS. 2 and 4.
The amount of operation of the absorbent pump (6) is determined.
以下、吸収冷凍機の動作について説明する。吸収冷凍
機の運転時、バーナー(1B)が燃焼すると共に、吸収液
ポンプ(6)及び冷媒ポンプ(15P)が運転され、従来
の吸収冷凍機と同様に吸収液及び冷媒が循環する。そし
て、蒸発器(4)で冷媒液が蒸発器熱交換器(21)に散
布され、蒸発器熱交換器(21)で温度が低下した冷水が
負荷へ供給される。Hereinafter, the operation of the absorption refrigerator will be described. During operation of the absorption refrigerator, the burner (1B) burns, and the absorption liquid pump (6) and the refrigerant pump (15P) are operated, so that the absorption liquid and the refrigerant circulate similarly to the conventional absorption refrigerator. Then, the refrigerant liquid is sprayed to the evaporator heat exchanger (21) by the evaporator (4), and the cold water whose temperature has been reduced by the evaporator heat exchanger (21) is supplied to the load.
上記のように吸収冷凍機が運転されているときの吸収
液ポンプ(6)に供給される電力の周波数の制御につい
て、説明する。Control of the frequency of the electric power supplied to the absorbent pump (6) when the absorption refrigerator is operating as described above will be described.
吸収冷凍機の運転中、冷水出口温度に基づいて燃料制
御弁(17)の開度、即ち、高温発生器(1)の加熱量は
制御される。又、液面検出器(24)が高温発生器(1)
の吸収液液面を検出する。そして、液面データが制御盤
(23)の演算装置(30)へ与えられ、吸収液液面の設定
値からの偏差が算出されてファジィ推論プロセッサ(2
7)に与えられる。ファジィ推論プロセッサ(27)で
は、記憶装置(28)に記憶されている上記吸収液液面の
設定値からの偏差に対するファジィ変数のメンバー・シ
ップ関数を用いて吸収液液面に対するメンバー・シップ
値を算出する。そして、このメンバー・シップ値が上記
制御ルール(R1〜R5)の前件部、即ち(R1)では吸収液
液面が設定値よりかなり高いということを満している割
合をファジィ論理積で算出する。そして、上記制御ルー
ル(R1〜R5)ごとの前件部が成立する割合をファジィ変
数(PB,PS,ZR,NS,NB)のメンバー・シップ関数に乗じて
メンバー・シップ関数の修正を行う。During the operation of the absorption refrigerator, the opening of the fuel control valve (17), that is, the heating amount of the high temperature generator (1) is controlled based on the chilled water outlet temperature. The liquid level detector (24) is a high temperature generator (1)
The liquid level of the absorbing liquid is detected. Then, the liquid level data is given to the arithmetic unit (30) of the control panel (23), the deviation from the set value of the absorbing liquid level is calculated, and the fuzzy inference processor (2) is used.
7) given. The fuzzy inference processor (27) calculates the membership value for the absorbent liquid level using a membership function of a fuzzy variable for the deviation from the set value of the absorbent liquid level stored in the storage device (28). calculate. The ratio of the membership value satisfying that the liquid level of the absorbing liquid is considerably higher than the set value in the antecedent part of the control rules (R 1 to R 5 ), that is, (R 1 ) is determined by fuzzy logic. Calculate by the product. Then, the ratio fuzzy variables antecedent of each said control rules (R 1 ~R 5) is satisfied (PB, PS, ZR, NS , NB) the modification of the member ship functions by multiplying the member ship functions Do.
次に、上記修正された制御ルールのメンバー・シップ
関数によって、上記吸収液液面の設定値からの偏差に応
じた吸収液ポンプ(6)の操作量、即ち、吸収液ポンプ
(6)に供給されている電力の周波数の操作量が求めら
れる。Next, the operation amount of the absorbent pump (6) according to the deviation from the set value of the absorbent liquid level, that is, supply to the absorbent pump (6) is performed by the membership function of the modified control rule. The manipulated variable of the frequency of the power being used is obtained.
ここで、吸収液液面の偏差が−6mmのときは、メンバ
ー・シップ関数、及び制御ルールによって、第8図に示
したようにファジィ論理演算が行われ、メンバー・シッ
プ値(A)が求められ、このメンバー・シップ値(A)
の重心(g)から吸収液ポンプ(6)へ供給される電力
の周波数の操作量(以下吸収液ポンプの周波数という)
が求められる。そして、吸収液ポンプ(6)の周波数、
この場合は+4Hzの信号が制御装置(26)へ出力され、
今までの周波数に4Hz加えた周波数信号が制御装置(2
6)からインバータ装置(6A)へ出力される。このた
め、インバータ装置(6A)から吸収液ポンプ(6)に供
給される電力の周波数が増加し、吸収液ポンプ(6)の
回転数が増加して吸収液吐出量が高温発生器(1)の吸
収液液面の上記偏差に応じて増加する。又、吸収液液面
が設定値より高く、偏差がプラスの場合にも、上記の偏
差がマイナスのときと同様にファジィ論理演算が行われ
吸収液ポンプ(6)の周波数が求められる。そして吸収
液ポンプ(6)に供給される電力の周波数が減少し、吸
収液ポンプ(6)の回転数が低下して吸収液吐出量が減
少する。又、冷却水の温度が変化した場合、或いは吸収
冷凍機の起動時などに吸収液液面と設定値との間に偏差
が発生した場合にも上記と同様にファジィ論理演算が行
われる。Here, when the deviation of the liquid level of the absorbing liquid is -6 mm, a fuzzy logic operation is performed by the membership function and the control rule as shown in FIG. 8, and the membership value (A) is obtained. This membership value (A)
Manipulated variable of the frequency of the power supplied from the center of gravity (g) to the absorbent pump (6) (hereinafter referred to as the frequency of the absorbent pump)
Is required. And the frequency of the absorbent pump (6),
In this case, a +4 Hz signal is output to the control device (26),
The frequency signal obtained by adding 4Hz to the current frequency is the control device (2
Output from 6) to the inverter device (6A). For this reason, the frequency of the electric power supplied from the inverter device (6A) to the absorption liquid pump (6) increases, the rotation speed of the absorption liquid pump (6) increases, and the discharge amount of the absorption liquid increases to the high temperature generator (1). Increases according to the above-mentioned deviation of the liquid level of the absorbing liquid. Also, when the liquid level of the absorbent is higher than the set value and the deviation is positive, the fuzzy logic operation is performed similarly to the case where the deviation is negative, and the frequency of the absorbent pump (6) is obtained. Then, the frequency of the electric power supplied to the absorption liquid pump (6) decreases, the rotation speed of the absorption liquid pump (6) decreases, and the discharge amount of the absorption liquid decreases. Also, when the temperature of the cooling water changes, or when a deviation occurs between the liquid level of the absorbing liquid and the set value when the absorption refrigerator is started, the fuzzy logic operation is performed in the same manner as described above.
上記実施例によれば、吸収液液面の設定値からの偏差
に対応した吸収液ポンプ(6)の周波数の制御について
人間の経験を制御ルール、及びメンバー・シップ関数と
して記憶装置(28)に記憶しておき、ファジィ論理演算
により人間の経験に基づいた吸収液ポンプ(6)の周波
数制御を行うことができ、吸収液ポンプ(6)の回転数
を変化させて吸収液液面の設定値からの偏差に即して高
温発生器(1)への吸収液流量を制御することができ、
この結果、吸収冷凍機の成績係数を向上することができ
る。According to the above embodiment, the experience of the human in the control of the frequency of the absorbent pump (6) corresponding to the deviation from the set value of the absorbent liquid level is stored in the storage device (28) as a control rule and a membership function. The frequency of the absorption liquid pump (6) can be controlled based on human experience by fuzzy logic operation, and the set value of the absorption liquid level can be changed by changing the rotation speed of the absorption liquid pump (6). The flow rate of the absorbent to the high-temperature generator (1) can be controlled according to the deviation from
As a result, the coefficient of performance of the absorption refrigerator can be improved.
以下、吸収液液面の設定値からの偏差と吸収液液面の
変化率とを用いて吸収液ポンプ(6)の周波数をファジ
ィ推論する第2の実施例について、説明する。記憶装置
(28)には上記各メンバー・シップ関数及び制御ルール
の他に、人間の経験に基づいて吸収液液面の変化率(mm
/min)についての制御ルール及びメンバー・シップ関数
が記憶されている。以下、制御ルールのR1〜R5について
説明する。Hereinafter, a second embodiment of fuzzy inference of the frequency of the absorption liquid pump (6) using the deviation from the set value of the absorption liquid level and the rate of change of the absorption liquid level will be described. In addition to the membership functions and control rules, the storage device (28) stores the rate of change (mm
/ min) and the membership function are stored. The following describes R 1 to R 5 of the control rules.
R1:吸収液液面が急激に上昇ならば、即ち変化率(d
T0)がPB(正に大)ならば、操作量(KQ)、即ち周波数
を直ちに減少(NB)。R 1 : If the absorption liquid level rises rapidly, that is, the rate of change (d
If T 0 ) is PB (positively large), the manipulated variable (KQ), that is, the frequency is immediately reduced (NB).
R2:吸収液液面がゆるやかに上昇ならば、即ち変化率
(dT0)がPS(正に小)ならば、操作量(KQ)を徐々に
減少(NS)。R 2 : If the absorption liquid level rises slowly, that is, if the rate of change (dT 0 ) is PS (positively small), the manipulated variable (KQ) gradually decreases (NS).
R3:吸収液液面が変化なしの場合、即ち変化率(dT0)
がZR(ゼロ)ならば、操作量(KQ)も変化なし。R 3 : Absorbent liquid level is unchanged, that is, change rate (dT 0 )
If ZR (zero), the manipulated variable (KQ) does not change.
R4:吸収液液面がゆるやかに低下ならば、即ち変化率
(dT0)がNS(負に小)ならば、操作量(KQ)を徐々に
増加(PS)。R 4 : If the liquid level of the absorbing solution gradually decreases, that is, if the rate of change (dT 0 ) is NS (negatively small), the manipulated variable (KQ) is gradually increased (PS).
R:吸収液液面が急激に低下ならば、即ち変化率(d
T0)がNB(負に大)ならば操作量(KQ)を急激に増加
(PB)。R: If the level of the absorbing liquid drops rapidly, that is, the rate of change (d
If T 0 ) is NB (negatively large), the manipulated variable (KQ) is rapidly increased (PB).
上記R1〜R5の制御ルールは第6図に示したようにな
る。The control rules of R 1 to R 5 are as shown in FIG.
又、吸収液液面の変化率に対するファジィ変数PB,PS,
ZR,NS,NBのメンバー・シップ関数は第5図に示したもの
である。そして、燃料制御弁(17)の開度に対するファ
ジィ変数PB,PS,ZR,NS,NBのメンバー・シップ関数は第7
図に示したものである。Also, the fuzzy variables PB, PS,
The membership functions of ZR, NS, and NB are as shown in FIG. The membership function of the fuzzy variables PB, PS, ZR, NS, NB with respect to the opening of the fuel control valve (17) is the seventh.
This is shown in the figure.
そして、第6図に示した制御ルールと、第5図、及び
第7図に示したメンバー・シップ関数とを用いてファジ
ィ推論プロセッサ(27)にてファジィ論理演算が行わ
れ、操作量が求められる。Then, a fuzzy logic operation is performed by the fuzzy inference processor (27) using the control rules shown in FIG. 6 and the membership functions shown in FIGS. 5 and 7, and an operation amount is obtained. Can be
上記のように、吸収液液面の変化率に対する制御ルー
ル及びメンバー・シップ関数、及び吸収液液面の設定値
からの偏差に対する制御ルール及びメンバー・シップ関
数が記憶装置(28)に記憶されている。又、演算装置
(30)は偏差の他に吸収液液面に基づいて変化率(1分
間の吸収液液面の変化)(mm/min)を演算する。そし
て、吸収冷凍機の運転時、上記第1の実施例と同様に吸
収液液面の設定値からの偏差に基づいて制御ルール及び
メンバー・シップ関数によってファジィ推論プロセッサ
(27)にてファジィ論理演算が行われ、上記偏差に応じ
た吸収液ポンプ(6)の周波数量のメンバー・シップ値
が求められる。ここで、偏差が−6mmのときは第1の実
施例と同様にメンバー・シップ値は第8図の(A)であ
る。さらに、吸収液液面の変化率に基づいて第6図に示
した制御ルールと第5図及び第7図に示したメンバー・
シップ関数によってファジィ推論プロセッサ(27)にて
ファジィ論理演算が行われ、上記変化率に応じた吸収液
ポンプ(6)の周波数のメンバー・シップ値が求められ
る、ここで変化率が例えば−8mm/minのときは第9図に
示したようにメンバー・シップ値(B)が求められる。
そして、ファジィ推論プロセッサ(27)にて上記各周波
数(操作量)のメンバー・シップ値(A)(B)の論理
和が求められ、この論理和の重心から周波数が求めら
れ、制御装置(26)へ出力される。制御装置(26)から
は上記の周波数を今までの周波数に加えた周波数信号が
出力され、吸収液ポンプ(6)に供給される電力の周波
数は最適に保たれる。As described above, the control rule and the membership function for the rate of change of the liquid level of the absorbent and the control rule and the membership function for the deviation from the set value of the liquid level of the absorbent are stored in the storage device (28). I have. Further, the arithmetic unit (30) calculates the rate of change (change of the liquid level of the absorbent for one minute) (mm / min) based on the liquid level of the absorbent in addition to the deviation. During operation of the absorption refrigerator, a fuzzy logic operation is performed by a fuzzy inference processor (27) based on a deviation from a set value of the liquid level of the absorption liquid by a control rule and a membership function, similarly to the first embodiment. Is performed, and the membership value of the frequency amount of the absorption liquid pump (6) according to the deviation is obtained. Here, when the deviation is -6 mm, the membership value is (A) in FIG. 8 as in the first embodiment. Further, the control rule shown in FIG. 6 and the member rules shown in FIGS.
A fuzzy logic operation is performed in the fuzzy inference processor (27) by the ship function, and a membership value of the frequency of the absorbent pump (6) corresponding to the above-mentioned change rate is obtained. In the case of min, the membership value (B) is obtained as shown in FIG.
The fuzzy inference processor (27) calculates the logical sum of the membership values (A) and (B) of the respective frequencies (operating variables), calculates the frequency from the center of gravity of the logical sum, and sets the control unit (26). ). The controller (26) outputs a frequency signal obtained by adding the above frequency to the conventional frequency, and the frequency of the electric power supplied to the absorbent pump (6) is kept optimal.
上記第2の実施例によれば、吸収液液面の設定値から
の偏差及び変化率に対応した吸収液ポンプ(6)の制御
についての人間の経験を制御ルール及びメンバー・シッ
プ関数として記憶装置(28)に記憶しておき、ファジィ
推論によって人間の経験に基づいた吸収液ポンプ(6)
の周波数を求めることができ、負荷の急激な変化で、吸
収液液面が変化した場合に、吸収液ポンプ(6)に供給
される電力の周波数が人間の経験に基づいて制御され、
吸収器(5)から高温発生器(1)は流れる吸収液の量
を最適に保つことができ、吸収液液面をほぼ一定に保つ
ことができる。According to the second embodiment, the human experience of controlling the absorbent pump (6) corresponding to the deviation from the set value of the absorbent liquid level and the rate of change is stored as a control rule and a membership function in the storage device. Absorbent pump based on human experience by fuzzy reasoning (6)
The frequency of the electric power supplied to the absorbent pump (6) is controlled based on human experience when the liquid level of the absorbent changes due to a sudden change in the load.
From the absorber (5) to the high temperature generator (1), the amount of the absorbing liquid flowing can be kept optimal, and the level of the absorbing liquid can be kept almost constant.
又、吸収液ポンプ(6)に供給される電力の周波数を
PID制御した場合と比較して吸収液液面の変化に対する
応答性が早く、吸収液液面が変化した場合にも、吸収液
液面を設定値に短時間で安定させることができる。Further, the frequency of the electric power supplied to the absorbing liquid pump (6) is
Responsiveness to a change in the liquid level of the absorbing liquid is faster than in the case of PID control, and even when the liquid level of the absorbing liquid changes, the liquid level of the absorbing liquid can be stabilized to the set value in a short time.
さらに、吸収液液面が低下して高温発生器(1)の液
面低(安全のために吸収冷凍機の運転を停止する液位)
に近くなると、吸収液ポンプ(6)に供給される電力の
周波数が、大幅に増加するため、上記の液面低が発生
し、吸収冷凍機が運転停止することを回避することがで
きる。Furthermore, the liquid level of the absorbing liquid is lowered and the liquid level of the high-temperature generator (1) is low (the liquid level at which the operation of the absorption refrigerator is stopped for safety).
, The frequency of the electric power supplied to the absorption liquid pump (6) is greatly increased, so that it is possible to avoid the occurrence of the above-mentioned low liquid level and the shutdown of the absorption refrigerator.
尚、吸収液液面の設定値からの偏差、及び吸収液液面
の変化率に関する制御ルール、及びメンバー・シップ関
数は上記実施例に限定されるものではなく、吸収冷凍機
の冷凍能力、吸収液ポンプ(6)の能力などに応じて決
められる。Note that the deviation from the set value of the absorption liquid level, the control rule relating to the rate of change of the absorption liquid level, and the membership function are not limited to those in the above-described embodiment. It is determined according to the capacity of the liquid pump (6) and the like.
又、上記実施例において、ファジィ論理演算を行って
吸収液ポンプに供給される電力の周波数を制御したが、
吸収液液面と吸収液ポンプの回転数との間に制御ルール
を構成して、又、吸収液ポンプの回転数のメンバー・シ
ップ関数を作り、ファジィ論理演算の演算結果により吸
収液ポンプの回転数を制御した場合も上記実施例と同様
の作用効果を得ることができる。又、吸収器から発生器
に至る吸収液管路に制御弁を設け、吸収液液面と制御弁
の開度との間に制御ルールを構成し、又、制御弁の開度
のメンバー・シップ関数を作り、ファジィ論理演算の演
算結果により制御弁の開度を制御した場合にも、同様の
作用効果を得ることができる。In the above embodiment, the frequency of the power supplied to the absorbent pump was controlled by performing a fuzzy logic operation.
A control rule is constructed between the liquid level of the absorbent and the rotational speed of the absorbent pump, and a membership function of the rotational speed of the absorbent pump is created, and the rotational speed of the absorbent pump is calculated based on the result of the fuzzy logic operation. Even when the number is controlled, the same operation and effect as the above embodiment can be obtained. In addition, a control valve is provided in the absorbent line from the absorber to the generator, a control rule is formed between the liquid level of the absorbent and the opening of the control valve, and the membership of the opening of the control valve is established. Similar functions and effects can be obtained when a function is created and the opening of the control valve is controlled based on the result of the fuzzy logic operation.
(ト)発明の効果 本発明は以上のように構成された吸収冷凍機の制御装
置であり、発生器に設けられた液面検出器と、この液面
検出器からの信号を入力して検出液面と設定値とを比較
してファジィ論理演算によって吸収液ポンプの周波数制
御を行う機構とを備えているので、吸収液液面と設定値
との偏差に対する周波数に関する人間の経験に基づいて
吸収液ポンプに供給される電力の周波数を制御すること
ができ、この結果、吸収液液面の設定値からの偏差に即
した吸収液ポンプの制御を行うことができる。(G) Effect of the Invention The present invention is a control device for an absorption refrigerator configured as described above, and detects a liquid level detector provided in a generator and a signal from the liquid level detector by inputting the signal. A mechanism for comparing the liquid level with the set value and controlling the frequency of the absorbent pump by fuzzy logic operation is provided. The frequency of the electric power supplied to the liquid pump can be controlled, and as a result, the absorption liquid pump can be controlled according to the deviation from the set value of the liquid level of the absorption liquid.
又、液面検出器と、この液面検出器が検出した吸収液
液面の設定値からの偏差と吸収液液面の変化率とメンバ
ー・シップ関数とファジィ・ルールとに基づいてファジ
ィ論理演算によって吸収液ポンプの回転数を制御する機
構を備えているので、負荷の変化或いは冷却水温度の変
化により、吸収液液面が変化した場合に、人間の経験に
基づいて吸収液ポンプの回転数を制御することができ、
この結果、吸収液液面をほぼ一定に保つことができる。Also, a fuzzy logic operation is performed based on a liquid level detector, a deviation from a set value of the liquid level detected by the liquid level detector, a rate of change of the liquid level, a membership function, and a fuzzy rule. A mechanism is provided to control the rotation speed of the absorption pump according to human experience when the absorption liquid level changes due to a change in load or a change in cooling water temperature. Can be controlled,
As a result, the level of the absorbing liquid can be kept substantially constant.
さらに、液面検出器と、この液面検出器が検出した吸
収液液面に基づく値をメンバー・シップ関数に代入して
ファジィ論理演算を行いこの演算結果によって吸収液液
面を一定に保つ機構を備えているので、負荷の変化など
によって吸収液液面が変化したとき、フィジィ論理演算
を行い発生器へ送られる吸収液の量を人間の経験に基づ
いて制御し、吸収液液面を一定に保つことができる。Further, a liquid level detector and a mechanism for substituting a value based on the liquid level detected by the liquid level detector into a membership function to perform a fuzzy logic operation and to keep the liquid level constant based on the calculation result. When the absorption liquid level changes due to a change in load, etc., the amount of the absorption liquid sent to the generator is controlled based on human experience by performing a fuzzy logic operation to keep the absorption liquid level constant. Can be kept.
第1図は本発明の一実施例を示す吸収冷凍機の回路構成
図、第2図は吸収液液面の設定値からの偏差に対するフ
ァジィ変数のメンバー・シップ関数を定義する図、第3
図は同じく偏差と操作量との間の制御ルールを示す図、
第4図は吸収液ポンプの周波数に対するファジィ変数の
メンバー・シップ関数を定義する図、第5図は吸収液液
面の変化率に対するファジィ変数のメンバー・シップ関
数を定義する図、第6図は同じく変化率と操作量との間
の制御ルールを示す図、第7図は吸収液ポンプの周波数
に対するファジィ変数のメンバー・シップ関数を定義す
る図、第8図は偏差が−6mmのときのファジィ論理演算
の説明図、第9図は変化率が−8mm/minのときのファジ
ィ論理演算の説明図である。 (1)……高温発生器、(5)……吸収器、(6)……
吸収液ポンプ、(23)……マイコン制御盤、(24)……
液面検出器。FIG. 1 is a circuit configuration diagram of an absorption refrigerator showing one embodiment of the present invention, FIG. 2 is a diagram defining a membership function of a fuzzy variable with respect to a deviation from a set value of an absorption liquid level, and FIG.
The figure also shows a control rule between the deviation and the manipulated variable,
FIG. 4 is a diagram defining the membership function of the fuzzy variable with respect to the frequency of the absorbent pump, FIG. 5 is a diagram defining the membership function of the fuzzy variable with respect to the rate of change of the liquid level of the absorbent, and FIG. Similarly, FIG. 7 shows a control rule between the rate of change and the manipulated variable, FIG. 7 defines a membership function of a fuzzy variable with respect to the frequency of the absorbent pump, and FIG. 8 shows a fuzzy variable when the deviation is -6 mm. FIG. 9 is an explanatory diagram of a logical operation, and FIG. 9 is an explanatory diagram of a fuzzy logical operation when the rate of change is −8 mm / min. (1) High temperature generator (5) Absorber (6)
Absorbent pump, (23) ... Microcomputer control panel, (24) ...
Liquid level detector.
フロントページの続き (58)調査した分野(Int.Cl.6,DB名) F25B 15/00 306Continuation of front page (58) Field surveyed (Int. Cl. 6 , DB name) F25B 15/00 306
Claims (3)
液ポンプを設けた吸収冷凍機の制御装置において、発生
器に設けられた液面検出器と、この液面検出器が検出し
た吸収液液面と設定値とを比較してファジィ論理演算に
よって吸収液ポンプの周波数制御を行う機構とを備えた
ことを特徴とする吸収冷凍機の制御装置。In a control apparatus for an absorption refrigerator having an absorption liquid pump provided in an absorption liquid line from an absorber to a generator, a liquid level detector provided in the generator and the liquid level detector detect the liquid level. A mechanism for comparing the level of the absorbed liquid with the set value and controlling the frequency of the absorbent pump by fuzzy logic operation.
液ポンプを設けた吸収冷凍機の制御装置において、発生
器の吸収液液面を検出する液面検出器と、この液面検出
器が検出した吸収液液面の設定値からの偏差と吸収液液
面の変化率とメンバー・シップ関数とファジィ・ルール
とに基づいてファジィ論理演算によって吸収液ポンプの
回転数を制御する機構とを備えたことを特徴とする吸収
冷凍機の制御装置。2. A control apparatus for an absorption refrigerator having an absorption liquid pump provided in an absorption liquid line from an absorber to a generator, a liquid level detector for detecting an absorption liquid level of the generator, and a liquid level detector for detecting the level of the absorption liquid. A mechanism for controlling the rotational speed of the absorbent pump by fuzzy logic operation based on the deviation from the set value of the absorbent liquid level detected by the detector, the rate of change of the absorbent liquid level, the membership function and the fuzzy rule A control device for an absorption refrigerator comprising:
器を備えた吸収冷凍機の制御装置において、発生器の吸
収液液面を検出する液面検出器と、この液面検出器が検
出した吸収液液面に基づく値をメンバー・シップ関数に
代入してファジィ論理演算を行いこの演算結果によって
発生器の吸収液液面を一定に保つ機構とを備えたことを
特徴とする吸収冷凍機の制御装置。3. A control device for an absorption refrigerator having a generator for heating an absorption liquid to separate refrigerant vapor, a liquid level detector for detecting a liquid level of an absorption liquid of the generator, and a liquid level detector for the liquid level detector. A fuzzy logic operation by substituting a value based on the detected liquid level of the absorbing liquid into a membership function, and a mechanism for keeping the liquid level of the generator constant by the result of the calculation. Refrigerator control device.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26251990A JP2816007B2 (en) | 1990-09-28 | 1990-09-28 | Control device for absorption refrigerator |
| KR1019910017158A KR960012321B1 (en) | 1990-09-28 | 1991-09-28 | Absorption Chiller Control |
| US07/767,312 US5224352A (en) | 1990-09-28 | 1991-09-30 | Control device for an absorption refrigeration machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26251990A JP2816007B2 (en) | 1990-09-28 | 1990-09-28 | Control device for absorption refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04139362A JPH04139362A (en) | 1992-05-13 |
| JP2816007B2 true JP2816007B2 (en) | 1998-10-27 |
Family
ID=17376936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26251990A Expired - Fee Related JP2816007B2 (en) | 1990-09-28 | 1990-09-28 | Control device for absorption refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2816007B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3252212B2 (en) * | 1997-07-18 | 2002-02-04 | 株式会社荏原製作所 | Absorption chiller controller |
| CN114483237B (en) * | 2022-01-20 | 2024-03-12 | 重庆江增船舶重工有限公司 | Organic working fluid distributed energy supply system evaporator liquid level balance control system and method |
-
1990
- 1990-09-28 JP JP26251990A patent/JP2816007B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04139362A (en) | 1992-05-13 |
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