JPH0697125B2 - Frequency controller for multi refrigeration cycle - Google Patents
Frequency controller for multi refrigeration cycleInfo
- Publication number
- JPH0697125B2 JPH0697125B2 JP62178309A JP17830987A JPH0697125B2 JP H0697125 B2 JPH0697125 B2 JP H0697125B2 JP 62178309 A JP62178309 A JP 62178309A JP 17830987 A JP17830987 A JP 17830987A JP H0697125 B2 JPH0697125 B2 JP H0697125B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- frequency
- speed
- value
- electric motor
- 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
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、マルチ冷凍サイクルの周波数制御装置に係
り、特に、電動機へ供給される速度制御用周波数を、圧
縮機の吐出側圧力を利用して制御できるようにした周波
数制御装置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency control device for a multi-refrigerating cycle, and more particularly to a speed control frequency supplied to an electric motor using a discharge side pressure of a compressor. The present invention relates to a frequency control device that can be controlled by the above.
［従来の技術］ 第２図は、例えば、特公昭61−28902号公報に示された
従来の空気調和装置の電動機の速度制御装置である。[Prior Art] FIG. 2 shows a speed control device for a motor of a conventional air conditioner disclosed in, for example, Japanese Patent Publication No. 61-28902.
図において、１は空気調和装置の運転モードを指令する
入力部、２は室内の目標温度設定器、３は室温センサ、
４は論理演算装置で、温度偏差検出器５、初期速度発生
器６、運転・停止信号発生器７、温度偏差変化検出器
８、温度偏差上限検出器９、運転速度保持器10及びタイ
マ11から構成されている。12は電動機運転制御器、13は
電動機である。In the figure, 1 is an input unit for instructing an operation mode of the air conditioner, 2 is an indoor target temperature setter, 3 is a room temperature sensor,
Reference numeral 4 denotes a logical operation device, which includes a temperature deviation detector 5, an initial speed generator 6, an operation / stop signal generator 7, a temperature deviation change detector 8, a temperature deviation upper limit detector 9, an operation speed holder 10 and a timer 11. It is configured. 12 is an electric motor operation controller, and 13 is an electric motor.
次に動作について説明する。Next, the operation will be described.
論理演算装置４には、入力部１からの冷，暖房などの運
転モード及び空気調和装置の運転・停止指令と、設定器
２からの目標室温情報と、室温センサ３によるアナログ
出力信号をディジタル信号に変換した出力がそれぞれ入
力される。これらの入力を基にして論理演算装置４が論
理演算を行い、これに伴う電動機13の運転・停止信号お
よび速度信号を電動機運転制御器12へ出力することによ
り、運転制御器12は電動機13を運転制御する。The logical operation unit 4 outputs a digital signal to the operation mode such as cooling and heating from the input unit 1 and an operation / stop command of the air conditioner, target room temperature information from the setter 2, and an analog output signal from the room temperature sensor 3. The output converted to is input respectively. The logical operation unit 4 performs logical operation based on these inputs, and outputs the operation / stop signal and the speed signal of the electric motor 13 associated therewith to the electric motor operation controller 12, whereby the operation controller 12 operates the electric motor 13. Operation control.
［発明が解決しようとする問題点］ 上記のような従来の電動機の速度制御方式では、設定器
２による目標室温と室温センサ３による出力がそれぞれ
論理演算装置４に入力され、室内温度のみで周波数制御
するものであるため、室内温度と目標温度との偏差信号
で周波数をアップしていくと、上限圧力に引掛り、マル
チ冷凍サイクルが有する高圧防止手段が動作して圧縮機
が運転不能となることがある。そのため、温度レベルに
応じた最高周波数の上限値を設定しておかなければなら
ず、これに加えて液バック等の過負荷時の高圧圧力保護
対策が必要であった。また、室内側熱交換器のファン速
度が下降することによって負荷が急増し、高圧圧力の上
限を急に上回る問題があり、更に室内側熱交換器が複数
運転される場合は、目標温度と室温センサの信号の処理
が不可能であった。[Problems to be Solved by the Invention] In the conventional speed control method for an electric motor as described above, the target room temperature by the setter 2 and the output by the room temperature sensor 3 are input to the logical operation device 4, and the frequency is determined only by the room temperature. Since it is controlled, if the frequency is increased by the deviation signal between the room temperature and the target temperature, the upper limit pressure is caught and the high pressure prevention means of the multi-refrigeration cycle operates to render the compressor inoperable. Sometimes. Therefore, it is necessary to set the upper limit value of the maximum frequency according to the temperature level, and in addition to this, it is necessary to take a high pressure protection measure against an overload such as a liquid bag. Moreover, there is a problem that the load rapidly increases due to the decrease in the fan speed of the indoor heat exchanger, and the upper limit of the high pressure is suddenly exceeded.If more than one indoor heat exchanger is operated, the target temperature and room temperature The sensor signal could not be processed.
また、特開昭62−129661号公報で、冷媒圧力が設定値以
上とならないよう圧縮機の運転周波数を制御する技術が
公知であり、そして、特開昭59−221580号公報では、温
度変化率を検出して圧縮機の運転周波数を制御する技術
が公知である。Further, Japanese Patent Laid-Open No. 62-129661 discloses a technique for controlling the operating frequency of a compressor so that the refrigerant pressure does not exceed a set value, and Japanese Laid-Open Patent Publication No. 59-221580 discloses a temperature change rate. There is known a technology for detecting the above-mentioned condition and controlling the operating frequency of the compressor.
前記両公報に掲載の技術は、閾値の選択を冷媒圧力にす
るか、或いは、温度変化率に設定するかの違いであり、
そのため、前述と同様に温度レベルに応じた最高周波数
の上限値を設定しておかなければならず、これに加えて
液バック等の過負荷時の高圧圧力保護対策が必要であっ
た。The technology disclosed in both publications is the difference in whether the threshold value is selected as the refrigerant pressure or the temperature change rate is set.
Therefore, similarly to the above, it is necessary to set the upper limit value of the maximum frequency according to the temperature level, and in addition to this, it is necessary to take a high pressure protection measure against an overload such as a liquid bag.
そこで、この発明は、上記のような問題点を解消するた
めになされたもので、圧縮機を上限圧力値以下の所定圧
力値幅内に運転制御できると共に、所定圧力値幅以下か
ら幅内への加速を可能にして冷凍サイクルの立ち上がり
スピードを早くでき、かつ室内機を複数個運転する時の
周波数制御も可能にしたマルチ冷凍サイクルの周波数制
御装置を提供することを目的とする。Therefore, the present invention has been made to solve the above-mentioned problems, and it is possible to control the operation of the compressor within a predetermined pressure value range of the upper limit pressure value or less and to accelerate from the predetermined pressure value range or less to the width range. It is an object of the present invention to provide a frequency control device for a multi-refrigerating cycle, which enables the above to speed up the start-up speed of the refrigerating cycle and also enables frequency control when operating a plurality of indoor units.
［問題点を解決するための手段］ この発明に係るマルチ冷凍サイクルの周波数制御装置
は、圧縮機の吐出側圧力を検出する圧力センサと、前記
圧力センサからの吐出圧力の変化量を求める圧力微分器
と、前記圧力微分器の動作時間を管理するタイマと、前
記圧力微分器からの変化量及び前記タイマの動作時間か
ら決定された予測圧力値が、予め設定した圧力値幅内に
あるか否かを判定する圧力幅判定器と、前記予測圧力値
が前記設定圧力幅の下限値以下のとき、前記速度指令に
対する周波数を増加補正し、前記予測圧力値が前記設定
圧力幅の上限値を越えたとき、前記速度指令に対する周
波数を減少補正するように前記電動機を制御する運転速
度保持器とを備えてなるものである。[Means for Solving Problems] A frequency controller for a multi-refrigerating cycle according to the present invention is a pressure sensor for detecting a discharge side pressure of a compressor, and a pressure differential for obtaining a change amount of the discharge pressure from the pressure sensor. And a timer that manages the operating time of the pressure differentiator, whether the predicted pressure value determined from the amount of change from the pressure differentiator and the operating time of the timer is within a preset pressure value range. When the predicted pressure value is less than or equal to the lower limit value of the set pressure width, the frequency for the speed command is increased and corrected, and the predicted pressure value exceeds the upper limit value of the set pressure width. At this time, an operating speed holder for controlling the electric motor so as to reduce and correct the frequency with respect to the speed command is provided.
［作用］ この発明においては、目標室温用設定器の値と室温セン
サの値との差に応じて周波数が増減されると共に、吐出
側圧力の値が予め設定した圧力値幅をオーバーすると予
測された時、制御手段が速度指令の周波数を減少補正す
るから、上限圧力以下で圧縮機を停止することなく、運
転続行することができ、かつ、吐出側圧力値が圧力値幅
以下の時、制御手段が速度指令の周波数を増加補正する
から、冷凍サイクルの立ち上がりスピードを早めること
が可能となり、更に、制御手段が各室の目標室温とこれ
に対応した各室の温度との差の加重偏差平均によって周
波数を決定するように作用するから、マルチ冷凍サイク
ルを適正な能力に制御できる。[Operation] In the present invention, it is predicted that the frequency will be increased or decreased according to the difference between the target room temperature setting device value and the room temperature sensor value, and the discharge side pressure value will exceed the preset pressure value range. At this time, the control means reduces and corrects the frequency of the speed command, so that the operation can be continued without stopping the compressor below the upper limit pressure, and when the discharge side pressure value is below the pressure value width, the control means Since the frequency of the speed command is increased and corrected, it is possible to accelerate the start-up speed of the refrigeration cycle.Furthermore, the control means calculates the frequency by the weighted deviation average of the difference between the target room temperature of each room and the corresponding room temperature. Therefore, the multi-refrigeration cycle can be controlled to an appropriate capacity.
［実施例］ 以下、この発明の一実施例を図について説明する。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
第１図において、1a〜1dはマルチ冷凍サイクルの運転・
停止及び冷，暖房などの運転モードを指定する各室の操
作入力器で、それぞれ入力部１に接続されている。2a〜
2dは空調すべき各室内の目標温度を設定する目標温度設
定器、3a〜3dは各室内に設置された室温センサ、４は論
理演算装置で、各室の設定目標温度とこれに対応する各
室内温度との加重偏差の平均値を求める加重偏差検出器
14と、電動機13の初期速度発生器６と、電動機13の運転
・停止信号発生器７と、電動機13の運転速度保持器10と
を備え、操作入力器1a〜1dからの信号は入力部１を介し
て、初期速度発生器６及び運転・停止信号発生器７に入
力される。加重偏差検出器14の出力信号は運転・停止信
号発生器７および運転速度保持器10に入力される。ま
た、初期速度発生器６の出力信号は運転速度保持器10に
入力される。さらに上記運転・停止信号発生器７及び運
転速度保持器10の出力は電動機運転制御器12に入力され
るようになっている。In Fig. 1, 1a to 1d indicate the operation of the multi-refrigeration cycle.
Operation input devices for each room that specify operation modes such as stop, cooling, and heating, and are connected to the input unit 1. 2a ~
2d is a target temperature setting device for setting a target temperature in each room to be air-conditioned, 3a to 3d are room temperature sensors installed in each room, 4 is a logical operation device, and the set target temperature of each room and the corresponding Weighted deviation detector that calculates the average of the weighted deviation from the room temperature
14, an initial speed generator 6 of the electric motor 13, a start / stop signal generator 7 of the electric motor 13, and an operation speed holder 10 of the electric motor 13, and signals from the operation input devices 1a to 1d are input to the input unit 1. Is input to the initial speed generator 6 and the run / stop signal generator 7 via. The output signal of the weight deviation detector 14 is input to the operation / stop signal generator 7 and the operation speed holder 10. The output signal of the initial speed generator 6 is input to the operating speed holder 10. Further, the outputs of the operation / stop signal generator 7 and the operation speed holder 10 are input to the electric motor operation controller 12.
また、上記論理演算装置４は、圧縮機の吐出圧力を検出
する圧力センサ15からの吐出圧力と、その変化量を求め
て予測圧力値を出力する圧力微分器16と、この圧力微分
器16の動作時間を管理するタイマ17および圧力微分器16
からの予測圧力値が予め設定した圧力値幅内にあるか否
かを判定し、その結果の出力信号を運転速度保持器10に
出力する圧力幅判定器18を備えている。Further, the logic operation device 4 includes a pressure differentiator 16 which outputs a predicted pressure value by obtaining the discharge pressure from the pressure sensor 15 which detects the discharge pressure of the compressor, the amount of change in the discharge pressure, and the pressure differentiator 16. Timer 17 and pressure differentiator 16 that manage operating time
The pressure range determiner 18 for determining whether or not the predicted pressure value from is within a preset pressure range and outputting an output signal of the result to the operating speed holder 10 is provided.
上記のように構成された本実施例の動作について説明す
る。The operation of this embodiment configured as described above will be described.
論理演算装置４には各操作入力器1a〜1dからの冷，暖房
などの運転モード及び空気調和装置の運転・停止指令
と、各設定器2a〜2dからの目標室温データと、室温セン
サ3a〜3dからの温度信号、及び圧力センサ15の出力信号
がそれぞれ入力される。論理演算装置４では、これらの
入力を基にして論理演算を行い、電動機13の運転・停止
信号及び速度信号を電動機運転制御器12へ出力する。運
転制御器12は、この信号にしたがって電動機13を運転制
御する。The logical operation device 4 includes operation modes such as cooling and heating from each operation input device 1a to 1d, a start / stop command of the air conditioner, target room temperature data from each setting device 2a to 2d, and a room temperature sensor 3a to. The temperature signal from 3d and the output signal of the pressure sensor 15 are input. The logical operation device 4 performs a logical operation based on these inputs and outputs an operation / stop signal of the electric motor 13 and a speed signal to the electric motor operation controller 12. The operation controller 12 controls the operation of the electric motor 13 according to this signal.
次に論理演算装置４の作用について詳述する。Next, the operation of the logical operation device 4 will be described in detail.
加重偏差検出器14は、各設定器2a〜2dの設定値と各室温
センサ3a〜3dにより測定される室温とを比較して、それ
ぞれの温度偏差△Ta〜△Tdに変換し、その値に各室内操
作入力器1a〜1dがオンの場合の４個の室内機の能力比を
乗じて加重偏差の平均値を求め、その値に定数Ｋを乗じ
て運転・停止信号発生器７と運転速度保持器10に出力す
る。The weighted deviation detector 14 compares the set values of the respective setters 2a to 2d with the room temperature measured by the respective room temperature sensors 3a to 3d, converts them into respective temperature deviations ΔTa to ΔTd, and converts them into the values. When each indoor operation input device 1a-1d is on, the average value of the weighted deviation is calculated by multiplying the capacity ratio of the four indoor units, and the value is multiplied by a constant K to generate the operation / stop signal generator 7 and the operation speed. Output to the cage 10.
運転・停止信号発生器７は各操作入力器1a〜1dからの信
号と加重偏差検出器14との出力信号を受け、電動機運転
制御器12に運転または停止の信号を出す。運転開始時に
は、各操作入力器1a〜1dの信号を初期速度発生器６が受
けて、その初期速度を運転速度保持器10に送る。更に圧
力センサ15の信号を圧力微分器16に入力し、タイマー17
の一定時間△ｔ前の吐出圧力との差分△Ｐを求める。圧
力微分器16にて測定した圧力P0と前記差分△Paとの和を
出力として圧力幅判定器18に出力する。圧力幅判定器18
では、上記予測圧力P0＋△Ｐの値が予め設定した圧力幅
の低値P1より小さい時は、『＋１』を、予測圧力P0＋△
Ｐが圧力幅の高値P2より大きい時は『−１』の値を、更
に予測圧力P0＋△Ｐの値が圧力幅P1〜P2内にある時は
『０』の値をそれぞれ運転速度保持器10に出力する。The operation / stop signal generator 7 receives the signals from the operation input devices 1a to 1d and the output signal from the weighted deviation detector 14, and outputs an operation or stop signal to the motor operation controller 12. At the start of operation, the initial speed generator 6 receives signals from the operation input devices 1a to 1d and sends the initial speed to the operating speed holder 10. Furthermore, the signal from the pressure sensor 15 is input to the pressure differentiator 16, and the timer 17
The difference ΔP from the discharge pressure before a certain time Δt of is calculated. The sum of the pressure P 0 measured by the pressure differentiator 16 and the difference ΔPa is output to the pressure width determiner 18 as an output. Pressure range determiner 18
Then, when the value of the predicted pressure P 0 + ΔP is smaller than the low value P 1 of the preset pressure width, “+1” is set to the predicted pressure P 0 + Δ.
P is the value of the high P 2 when larger pressures width "-1", more predictable pressure P 0 + △ when the value of P is in the pressure range P 1 to P in 2 each a value of "0" Output to the operating speed holder 10.
運転速度保持器10は初期速度発生器６と加重偏差検出器
14と圧力幅判定器18の信号を受ける。初期速度発生器６
からの信号が『＋１』の場合は優先的に、予め設定され
た初期速度を運転制御器12に発する。初期速度発生器６
からの信号がなく（０の場合）、しかも圧力幅判定器18
からの信号が『０』の時は、加重偏差検出器14からでる
温度偏差△Ｔに、ある設定値Ｋを乗じたＫ△ＴHzの速度
変更量を電動機運転制御器12に出力する。The operating speed holder 10 is the initial speed generator 6 and the weight deviation detector.
14 and the signal of the pressure range determination device 18 are received. Initial velocity generator 6
When the signal from is "+1", the operation controller 12 is preferentially issued with a preset initial speed. Initial velocity generator 6
There is no signal from (when it is 0), and the pressure range determiner 18
When the signal from "0" is "0", the temperature deviation ΔT from the weight deviation detector 14 is multiplied by a certain set value K to output a speed change amount of KΔT Hz to the motor operation controller 12.
そして、圧力幅判定器18の信号が『＋１』の場合、前記
速度変更量Ｋ△ＴHzに増加修正量△Hzを加えたＫ△ＴHz
＋△Hzとし、圧力幅判定器18からの信号が『−１』の時
は、速度変更量Ｋ△ＴHzに減少修正量−△Hzを加えたＫ
△ＴHz−△Hzとして電動機運転制御器に出力する。When the signal from the pressure range determiner 18 is “+1”, KΔT Hz obtained by adding the increase correction amount ΔHz to the speed change amount KΔT Hz.
+ △ and Hz, when the signal from the pressure width determiner 18 is "-1", the speed change amount K △ T Hz decreasing correction amount - △ Hz was added K
△ T Hz - △ outputs to the motor driving controller as Hz.
上記のように圧力センサ15の値からの一定時間後の予測
圧力が予め設定した圧力値幅以下と予測される時は周波
数の増加補正を実行し、そして予め設定した圧力値幅を
越えると予測される時は周波数の減少補正を実行するも
のであるから、圧縮機の吐出圧力を圧力値幅内に存在す
るよう電動機の周波数を制御することができ、これに伴
い液バック等の過負荷運転時にも運転を続行させること
ができると共に、圧力値幅以下の時周波数を増加補正す
るから冷凍サイクルの立ち上がりスピードを短縮でき、
しかも従来のような圧力防止対策が不要になる。また、
マルチ冷凍サイクルにおける各目標室温とこれに対応す
る各室温センサとの差の加重偏差平均値によって周波数
を決定するから、冷凍サイクルを適正な能力に制御でき
る。As described above, when the predicted pressure after a certain time from the value of the pressure sensor 15 is predicted to be equal to or less than the preset pressure value width, the frequency increase correction is executed, and it is predicted that the preset pressure value width is exceeded. Since the frequency reduction correction is executed at this time, it is possible to control the frequency of the motor so that the discharge pressure of the compressor is within the pressure value range. It is possible to continue, and the rising speed of the refrigeration cycle can be shortened because the frequency is increased and corrected when the pressure value is below the range.
Moreover, the conventional pressure prevention measures are unnecessary. Also,
Since the frequency is determined by the weighted deviation average value of the difference between each target room temperature and the corresponding room temperature sensor in the multi-refrigeration cycle, the refrigeration cycle can be controlled to an appropriate capacity.
また、上記実施例ではマルチ冷凍サイクルにおける各室
内の温度偏差の加重平均値を用いて周波数を決定してい
るため、冷凍サイクルを適正な能力に制御できるという
効果がある。Further, in the above embodiment, the frequency is determined by using the weighted average value of the temperature deviations in each room in the multi refrigeration cycle, so that there is an effect that the refrigeration cycle can be controlled to an appropriate capacity.
なお、上記実施例では吐出圧力センサ15を設けたが、こ
れに代えて凝縮機の飽和温度センサを用いてもよい。Although the discharge pressure sensor 15 is provided in the above embodiment, a saturation temperature sensor of the condenser may be used instead of the discharge pressure sensor 15.
［発明の効果］ 以上のように、この発明によれば、圧縮機の吐出側圧力
を検出する圧力センサからの吐出圧力の変化量を求める
圧力微分器からの変化量及び圧力微分器の動作時間を管
理するタイマの動作時間から決定された予測圧力値が、
予め設定した圧力値幅内にあるか否かを判定する圧力幅
判定器と、その予測圧力値が前記設定圧力幅の下限値以
下のとき、その速度指令に対する周波数を増加補正し、
その予測圧力値が設定圧力幅の上限値を越えたとき、速
度指令に対する周波数を減少補正するように電動機を制
御するものであるから、予測圧力値が設定された圧力幅
未満のときは、更に周波数を増大補正し、予測圧力値が
設定された圧力幅を越すときは、周波数を減少補正する
ものであるため、高圧防止にひっかかることなく過負荷
時でも運転を続行することができ、しかも立ち上がりの
スピードの短縮効果があり、機器の信頼性と同時に快適
性も改善できる。As described above, according to the present invention, the change amount from the pressure differentiator and the operating time of the pressure differentiator for obtaining the change amount of the discharge pressure from the pressure sensor that detects the discharge side pressure of the compressor The predicted pressure value determined from the operating time of the timer that manages
A pressure range determiner for determining whether or not it is within a preset pressure value range, and when the predicted pressure value is less than or equal to the lower limit value of the set pressure range, the frequency for the speed command is increased and corrected,
When the predicted pressure value exceeds the upper limit of the set pressure width, the motor is controlled so as to reduce the frequency with respect to the speed command.Therefore, if the predicted pressure value is less than the set pressure width, When the frequency is increased and corrected and the predicted pressure value exceeds the set pressure range, the frequency is decreased and corrected, so it is possible to continue operation even during overload without getting caught in high pressure prevention, and to start up. It has the effect of reducing the speed of, and improves the reliability as well as the comfort of the device.
また、予測制御を行っているから、圧縮機を正確に上限
圧力値以下の所定圧力値幅内に運転制御でき、かつ、所
定圧力値幅以下から幅内への加速を可能にして冷凍サイ
クルの立ち上がりスピードを早くでき、室内機を複数個
運転する時の周波数制御も可能になる等の効果を奏す
る。In addition, since predictive control is performed, the compressor can be accurately controlled to operate within a predetermined pressure value range below the upper limit pressure value, and acceleration from within the predetermined pressure value range to within the range can be performed to increase the start-up speed of the refrigeration cycle. This has the effect of speeding up the operation and enabling frequency control when operating a plurality of indoor units.
第１図はこの発明の一実施例のマルチ冷凍サイクルの周
波数制御装置のブロック図、第２図は従来のマルチ冷凍
サイクルの周波数制御装置のブロック図である。 図において、 1a〜1d:操作入力器 2a〜2d:目標温度設定器 3a〜3d:室温センサ 4:論理演算装置、6:初期速度発生器 7:運転・停止信号発生器 8:温度偏差変化検出器 9:温度偏差上限検出器 10:運転速度保持器、12:電動機運転制御器 13:電動機、15:圧力センサ 16:圧力微分器、17:タイマ 18:圧力幅判定器 である。 なお、図中同一符号及び同一記号は、同一又は相当部分
を示すものである。FIG. 1 is a block diagram of a frequency controller for a multi refrigeration cycle according to an embodiment of the present invention, and FIG. 2 is a block diagram of a frequency controller for a conventional multi refrigeration cycle. In the figure, 1a to 1d: Operation input device 2a to 2d: Target temperature setting device 3a to 3d: Room temperature sensor 4: Logical operation device, 6: Initial speed generator 7: Run / stop signal generator 8: Temperature deviation change detection Device 9: Temperature deviation upper limit detector 10: Operating speed retainer, 12: Motor operation controller 13: Electric motor, 15: Pressure sensor 16: Pressure differentiator, 17: Timer 18: Pressure width determiner. The same reference numerals and symbols in the drawings indicate the same or corresponding parts.
Claims (1)
結された電動機を有し、かつ温度偏差検出手段により空
調すべき目標室温を実際の室温との温度偏差として検出
し、前記温度偏差に応じた速度指令を発生して前記電動
機の速度を制御するマルチ冷凍サイクルにおいて、 前記圧縮機の吐出側圧力を検出する圧力センサと、 前記圧力センサからの吐出圧力の変化量を求める圧力微
分器と、 前記圧力微分器の動作時間を管理するタイマと、 前記圧力微分器からの変化量及び前記タイマの動作時間
から決定された予測圧力値が、予め設定した圧力値幅内
にあるか否かを判定する圧力幅判定器と、 前記予測圧力値が前記設定圧力幅の下限値以下のとき、
前記速度指令に対する周波数を増加補正し、前記予測圧
力値が前記設定圧力幅の上限値を越えたとき、前記速度
指令に対する周波数を減少補正するように前記電動機を
制御する運転速度保持器と を具備することを特徴とするマルチ冷凍サイクルの周波
数制御装置。1. An electric motor connected to a compressor whose frequency is variable by frequency control, wherein a temperature deviation detecting means detects a target room temperature to be air-conditioned as a temperature deviation from an actual room temperature. In a multi-refrigeration cycle in which a speed command is generated to control the speed of the electric motor, a pressure sensor that detects the discharge side pressure of the compressor, and a pressure differentiator that determines the amount of change in the discharge pressure from the pressure sensor. , A timer that manages the operating time of the pressure differentiator, and whether the predicted pressure value determined from the amount of change from the pressure differentiator and the operating time of the timer is within a preset pressure value range And a pressure range determiner, when the predicted pressure value is less than or equal to the lower limit of the set pressure range,
An operating speed holder for controlling the electric motor so as to increase-correct the frequency with respect to the speed command and, when the predicted pressure value exceeds the upper limit value of the set pressure width, decrease-correct the frequency with respect to the speed command. A frequency control device for a multi-refrigeration cycle, characterized in that
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62178309A JPH0697125B2 (en) | 1987-07-17 | 1987-07-17 | Frequency controller for multi refrigeration cycle |
| KR1019880003799A KR910004393B1 (en) | 1987-04-22 | 1988-04-06 | Frequency control apparatus of a multi-refregeration cycle system |
| US07/184,024 US4831836A (en) | 1987-04-22 | 1988-04-20 | Frequency control apparatus of a multi-refrigeration cycle system |
| MYPI88000408A MY102332A (en) | 1987-04-22 | 1988-04-21 | Frequency control apparatus of a multi-refrigeration cycle system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62178309A JPH0697125B2 (en) | 1987-07-17 | 1987-07-17 | Frequency controller for multi refrigeration cycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6423064A JPS6423064A (en) | 1989-01-25 |
| JPH0697125B2 true JPH0697125B2 (en) | 1994-11-30 |
Family
ID=16046223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62178309A Expired - Fee Related JPH0697125B2 (en) | 1987-04-22 | 1987-07-17 | Frequency controller for multi refrigeration cycle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0697125B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2503699B2 (en) * | 1989-12-14 | 1996-06-05 | ダイキン工業株式会社 | Compressor discharge pipe temperature control device |
| JPH0413053A (en) * | 1990-04-28 | 1992-01-17 | Mitsubishi Electric Corp | Freezer |
| GB2403378B (en) * | 2003-06-27 | 2007-05-30 | Ipwireless Inc | Method and arrangement for TCP flow control |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59221580A (en) * | 1983-05-30 | 1984-12-13 | 株式会社東芝 | Method of operating refrigerator |
| JPS62129661A (en) * | 1985-11-30 | 1987-06-11 | 株式会社東芝 | Air conditioner |
-
1987
- 1987-07-17 JP JP62178309A patent/JPH0697125B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6423064A (en) | 1989-01-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |