JP2002333189A - Method of controlling air conditioner - Google Patents
Method of controlling air conditionerInfo
- Publication number
- JP2002333189A JP2002333189A JP2001140886A JP2001140886A JP2002333189A JP 2002333189 A JP2002333189 A JP 2002333189A JP 2001140886 A JP2001140886 A JP 2001140886A JP 2001140886 A JP2001140886 A JP 2001140886A JP 2002333189 A JP2002333189 A JP 2002333189A
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- Prior art keywords
- opening
- valve means
- compressor
- frequency
- operating speed
- 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.)
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- Air Conditioning Control Device (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気調和機の冷凍
サイクルを構成する冷媒流量調節手段の膨張弁（電子膨
張弁）の制御技術に係り、特に詳しくは、膨張弁の制御
を一意的に行うようにした空気調和機の制御方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for controlling an expansion valve (electronic expansion valve) of a refrigerant flow rate adjusting means constituting a refrigeration cycle of an air conditioner, and more particularly, to uniquely controlling an expansion valve. The present invention relates to a method of controlling an air conditioner to be performed.
【０００２】[0002]
【従来の技術】空気調和機は、例えば図４に示すよう
に、圧縮機１、四方弁２、室内熱交換器３、室外熱交換
器４および電子膨張弁５等からなる冷凍サイクルを有
し、冷房運転時（ドライン運転も含む）あるいは暖房運
転時に応じて四方弁２を切り換えて冷媒を所定に循環さ
せ、室温コントロールを行う。2. Description of the Related Art An air conditioner has a refrigerating cycle including a compressor 1, a four-way valve 2, an indoor heat exchanger 3, an outdoor heat exchanger 4, an electronic expansion valve 5, and the like, as shown in FIG. The four-way valve 2 is switched according to the cooling operation (including the drain operation) or the heating operation to circulate the refrigerant in a predetermined manner, thereby controlling the room temperature.
【０００３】そのため、図５に示すように、空気調和機
はマイクロコンピュータやドライブ回路等からなる室内
機制御部６および室外機制御部７を備え、室内機制御部
６は、リモコン８による指示にしたがって室内ファン９
を制御するとともに、室外機制御部７に所定指令（室温
と設定値の差に応じた運転周波数等）を転送し、室外機
制御部７は、その指令により圧縮機１、四方弁２、電子
膨張弁５および室外ファン１０等を制御する。For this purpose, as shown in FIG. 5, the air conditioner includes an indoor unit control unit 6 and an outdoor unit control unit 7 including a microcomputer, a drive circuit, and the like. Therefore, the indoor fan 9
And a predetermined command (such as an operating frequency according to the difference between the room temperature and the set value) is transmitted to the outdoor unit control unit 7. The expansion valve 5 and the outdoor fan 10 are controlled.
【０００４】また、この空気調和機は、種々のセンサ、
例えば、室内温度センサ１１、室内熱交換器３の熱交温
度（例えば熱交換器の中間温度）を検出する室内熱交セ
ンサ１２、圧縮機１のサクション温度を検出するサクシ
ョンセンサ１３および室外熱交換器４の熱交温度（例え
ば熱交換器の中間温度）を検出する室外熱交センサ１４
とを備えている。そして、室内機制御部６は、室温がリ
モコン８の設定温度になるように室温をコントロールす
るのに必要な制御（圧縮機の運転周波数指令）を行い、
室外機制御部７は、その指令にしたがって必要とする部
位を制御する。This air conditioner has various sensors,
For example, an indoor temperature sensor 11, an indoor heat exchange sensor 12 for detecting a heat exchange temperature of the indoor heat exchanger 3 (for example, an intermediate temperature of the heat exchanger), a suction sensor 13 for detecting a suction temperature of the compressor 1, and an outdoor heat exchange Outdoor heat exchange sensor 14 for detecting the heat exchange temperature of the heat exchanger 4 (for example, the intermediate temperature of the heat exchanger)
And Then, the indoor unit controller 6 performs control (operation frequency command of the compressor) necessary for controlling the room temperature so that the room temperature becomes the set temperature of the remote controller 8,
The outdoor unit control unit 7 controls a necessary part according to the command.
【０００５】このとき、室外機制御部７は、例えば冷房
運転時であればサクション温度と室内熱交換器３の蒸発
温度の差（（ＳＨ）量；スーパーヒート量）を一定値
（目標値；例えば３ｄｅｇ．）に合わせるようにスーパ
ーヒート制御を実行し、電子膨張弁５の開閉度合を所定
に調節して冷凍サイクルの安定化を図る。なお、暖房運
転であれば、サクション温度と室外熱交換器４の蒸発温
度の差（（ＳＨ）量）を目標値に合わせるようにスーパ
ーヒート制御を行う。At this time, for example, in the cooling operation, the outdoor unit controller 7 sets the difference between the suction temperature and the evaporation temperature of the indoor heat exchanger 3 ((SH) amount; superheat amount) to a constant value (target value; (For example, 3 deg.), And the degree of opening and closing of the electronic expansion valve 5 is adjusted to a predetermined value to stabilize the refrigeration cycle. In the heating operation, the superheat control is performed so that the difference between the suction temperature and the evaporation temperature of the outdoor heat exchanger 4 ((SH) amount) is adjusted to the target value.
【０００６】[0006]
【発明が解決しようとする課題】上記空気調和機の制御
方法においては、室内熱交温度とサクション温度の差、
あるいは、サクション温度と室外熱交温度の差により電
子膨張弁５を制御するため、電子膨張弁５の動作回数が
多くなり、耐久性の観点から好ましくない。In the control method of the air conditioner, the difference between the indoor heat exchange temperature and the suction temperature is determined.
Alternatively, since the electronic expansion valve 5 is controlled based on the difference between the suction temperature and the outdoor heat exchange temperature, the number of operations of the electronic expansion valve 5 increases, which is not preferable from the viewpoint of durability.
【０００７】また、室内熱交センサ１２、サクションセ
ンサ１３および室外熱交センサ１４には検出誤差にバラ
ツキがあり、そのバラツキが大きいと、スーパーヒート
制御が適切に行われないことがあり、冷凍サイクルの安
定化を阻害することにもなり、信頼性の低下を招くこと
になる。さらに、複数の温度センサが必要であるため、
その分コストがかかると言った欠点もある。The indoor heat exchange sensor 12, the suction sensor 13, and the outdoor heat exchange sensor 14 vary in detection error. If the variation is large, superheat control may not be performed properly, and the refrigeration cycle may not be performed. This may hinder the stabilization of the device, resulting in a decrease in reliability. In addition, because multiple temperature sensors are required,
There is a disadvantage that it costs more.
【０００８】本発明は、上記課題に鑑みなされたもので
あり、その目的は、検出された温度差を用いることな
く、一意的に膨張弁の開閉度合を制御して耐久性を高め
るとともに、冷凍サイクルの安定化を図って信頼性を向
上させ、かつ、コストダウンを図ることができるように
した空気調和機の制御方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to improve durability by uniquely controlling the degree of opening and closing of an expansion valve without using a detected temperature difference. An object of the present invention is to provide a method of controlling an air conditioner, which can stabilize a cycle to improve reliability and reduce costs.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、冷凍サイクルを構成する電子膨張弁の開
閉度合を制御して同冷凍サイクルを運転し、室温コント
ロールを行う空気調和機の制御方法において、上記冷凍
サイクルを構成する圧縮機の運転回転数領域を複数の周
波数ゾーンに分けるとともに、各周波数ゾーン毎に上記
電子膨張弁の開閉度合を設定し、かつ、これらをテーブ
ル化して記憶し、上記冷凍サイクルの運転時には、上記
圧縮機の運転回転数に対応する周波数ゾーンを選択し、
上記テーブルを参照して上記選択周波数ゾーンに応じた
開閉度合を読み出すとともに、上記電子膨張弁を上記読
み出した開閉度合に制御するようにしたことを特徴とし
ている。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an air conditioner which controls the degree of opening and closing of an electronic expansion valve constituting a refrigeration cycle, operates the refrigeration cycle, and controls room temperature. In the control method, the operating speed range of the compressor constituting the refrigeration cycle is divided into a plurality of frequency zones, and the degree of opening and closing of the electronic expansion valve is set for each frequency zone, and these are tabulated. When operating the refrigeration cycle, select a frequency zone corresponding to the operating speed of the compressor,
An open / close degree corresponding to the selected frequency zone is read with reference to the table, and the electronic expansion valve is controlled to the read open / close degree.
【００１０】上記複数の周波数ゾーンは上記圧縮機の運
転周波数の上昇時と下降時で異ならせ、上記運転周波数
の上昇時よりも下降時を低くするとよい。これにより、
当該電子膨張弁の制御において、ハインチングを起こす
ことなく適切な制御が行われる。[0010] The plurality of frequency zones may be made different between when the operating frequency of the compressor rises and when it falls, and lower when the operating frequency falls than when the operating frequency rises. This allows
In the control of the electronic expansion valve, appropriate control is performed without causing hinting.
【００１１】上記圧縮機の運転回転数の変更が大きく、
この変更前の運転回転数に対応する周波数ゾーンと変更
後の運転回転数に対応する周波数ゾーンとのステップ数
差が所定値より大きい場合には、上記電子膨張弁を、一
旦所定値の開閉度合とし、しかる後、上記電子膨張弁を
変更後の運転回転数に対応する開閉度合に制御するとよ
い。The change in the operating speed of the compressor is large,
If the difference in the number of steps between the frequency zone corresponding to the operating rotational speed before the change and the frequency zone corresponding to the operational rotational speed after the change is greater than a predetermined value, the electronic expansion valve is once opened and closed to a predetermined value. After that, the electronic expansion valve may be controlled to the opening / closing degree corresponding to the changed operation speed.
【００１２】また、上記運転回転数の変更が上昇である
ときには、上記電子膨張弁の変更後の開閉度合に所定割
合を加算し、あるいは、上記運転回転数の変更が下降で
あるときには上記電子膨張弁の現開閉度合を維持し、こ
の電子膨張弁の開閉度合を所定時間保持した後に同電子
膨張弁を変更後の運転回転数に対応する開閉度合に制御
するとよい。これにより、圧縮機の運転回転数が大きく
変更された場合でも、冷凍サイクルを不安定にすること
もない。When the change in the operating speed is increasing, a predetermined ratio is added to the changed opening / closing degree of the electronic expansion valve, or when the change in the operating speed is decreasing, the electronic expansion is decreased. It is preferable to maintain the current opening / closing degree of the valve, hold the opening / closing degree of the electronic expansion valve for a predetermined time, and then control the electronic expansion valve to the opening / closing degree corresponding to the changed operation speed. Thus, even when the operating speed of the compressor is greatly changed, the refrigeration cycle is not unstable.
【００１３】上記電子膨張弁を、一旦所定値の開閉度合
とし、あるいは、上記電子膨張弁の変更後の開閉度合に
所定割合を加算し、もしくは、上記電子膨張弁の現開閉
度合を維持した場合には、上記上記圧縮機の実運転回転
数が変更運転回転数となり、しかる後に所定時間が経過
したときに、上記電子膨張弁を上記変更後の運転回転数
に対応する周波数ゾーンの開閉度合に制御するとよい。
これにより、圧縮機の運転回転数が大きく変更された場
合でも、冷凍サイクルが不安定になることもない。ま
た、圧縮機の運転回転数が目標回転数に安定してから、
電子膨張弁の開閉度合が当該運転回転数に対応する値に
されるため、冷凍サイクルの運転が適切に行われ、ひい
ては室温コントロールが最適に行われる。When the electronic expansion valve is once set to a predetermined opening / closing degree, or a predetermined ratio is added to the changed opening / closing degree of the electronic expansion valve, or the current opening / closing degree of the electronic expansion valve is maintained. The actual operating speed of the compressor becomes a changed operating speed, and when a predetermined time has elapsed after that, the electronic expansion valve is opened and closed in a frequency zone corresponding to the changed operating speed. It is better to control.
Thus, even when the operating speed of the compressor is greatly changed, the refrigeration cycle does not become unstable. Also, after the operating speed of the compressor has stabilized to the target speed,
Since the degree of opening and closing of the electronic expansion valve is set to a value corresponding to the operation speed, the operation of the refrigeration cycle is appropriately performed, and the room temperature is controlled optimally.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施の形態を図１
ないし図３を参照して説明する。なお、図２３中、図５
と同一部分には同一符号を付して重複説明を省略する。
また、冷凍サイクルの構成は図４を参照されたい。FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. In FIG. 23, FIG.
The same parts as those described above are denoted by the same reference numerals, and redundant description will be omitted.
See FIG. 4 for the configuration of the refrigeration cycle.
【００１５】図２において、本発明の空気調和機の制御
方法が適用される制御装置は、図３および下記表１に示
すように、圧縮機１の運転回転数領域を複数周波数ゾー
ンに分け、各周波数ゾーン毎に電子膨張弁５の固定パル
ス（開閉度合）を一意的に決定してテーブル化し、これ
を内部メモリ２０ａに記憶し、このテーブルを参照して
図１に示すルーチンにより電子膨張弁５の開閉度合を制
御する室外機制御部２０を備えている。In FIG. 2, the control device to which the control method of the air conditioner of the present invention is applied, as shown in FIG. 3 and Table 1 below, divides the operating speed range of the compressor 1 into a plurality of frequency zones, The fixed pulse (opening / closing degree) of the electronic expansion valve 5 is uniquely determined for each frequency zone and is tabulated. The table is stored in the internal memory 20a, and by referring to this table, the routine shown in FIG. 5 is provided with an outdoor unit control unit 20 for controlling the degree of opening and closing of the outdoor unit 5.
【００１６】[0016]
【表１】 [Table 1]
【００１７】上記表１について説明すると、圧縮機１の
運転回転数領域を複数の周波数ゾーンＡないしＰに分割
し、運転回転数の高い周波数ゾーンほど、電子膨張弁５
の固定パルスを多くする（開度合を大きくする）。Referring to Table 1, the operating speed range of the compressor 1 is divided into a plurality of frequency zones A to P.
Increase the number of fixed pulses (increase the degree of opening).
【００１８】また、その運転周波数が上昇時にある場合
と、下降時にある場合とで周波数ゾーンの割り付けを異
ならせ、下降時にある周波数ゾーンを上昇時の周波数ゾ
ーンより低くし、電子膨張弁５の制御にヒステリシスを
持たせている。なお、運転回転数の低領域における周波
数ゾーンについては、その上昇時と下降時とで同じ割り
付けとしてなる。The assignment of frequency zones is made different between when the operating frequency is increasing and when the operating frequency is decreasing, so that the frequency zone at the time of lowering is lower than the frequency zone at the time of increasing. Has hysteresis. It should be noted that the frequency zones in the low region of the operating speed are assigned the same at the time of increase and at the time of decrease.
【００１９】上記表１は一例であり、例えば、電子膨張
弁５の固定パルス（開閉度合）の設定は、圧縮機１の回
転数が低い領域において圧縮機１の信頼性を確保するた
めに、低外気温度時においては、凝縮温度と圧縮機底温
度の差が確保できる開度に設定する。また、圧縮機１の
回転数が高い領域においては、高温高湿度中の冷房時に
蒸発器が異常に過熱することがないように、その開度を
設定するとよい。Table 1 is an example. For example, the setting of the fixed pulse (degree of opening / closing) of the electronic expansion valve 5 is performed in order to secure the reliability of the compressor 1 in a region where the rotation speed of the compressor 1 is low. At a low outside air temperature, the opening is set such that a difference between the condensation temperature and the compressor bottom temperature can be secured. Further, in a region where the number of revolutions of the compressor 1 is high, its opening may be set so that the evaporator does not abnormally overheat during cooling in high temperature and high humidity.
【００２０】このように、電子膨張弁５の開閉度合を圧
縮機１の運転回転数に応じて一意的に決定しても、圧縮
機１の運転回転数は室温と設定温度の差によって決定さ
れ、運転回転数と電子膨張弁５の開閉度合とは相対的な
関係にあることから、冷凍サイクルの運転へ悪影響が及
ぶこともない。なお、図１に示すルーチンのうち、ステ
ップＳＴ１，ＳＴ２は室内機制御部６によって実行され
る。Thus, even if the degree of opening and closing of the electronic expansion valve 5 is uniquely determined according to the operating speed of the compressor 1, the operating speed of the compressor 1 is determined by the difference between the room temperature and the set temperature. Since the operating speed and the degree of opening and closing of the electronic expansion valve 5 are in a relative relationship, there is no adverse effect on the operation of the refrigeration cycle. Steps ST1 and ST2 of the routine shown in FIG. 1 are executed by the indoor unit control unit 6.
【００２１】次に、上記構成の制御装置の動作を図１の
フローチャート図を参照して説明する。まず、リモコン
８によって、例えば冷房運転の操作が行われたものとす
る。室内機制御部８は、室内温度センサ１１による検出
室温、リモコン８による設定温度および運転モード等を
読み取り（ステップＳＴ１）、その設定温度と室温との
差により圧縮機１の運転周波数（回転数）を決定し（ス
テップＳＴ２）、この運転回転数や運転モード（冷房運
転）等を室外機制御部２０に送信する一方、室内ファン
９を回転制御する。Next, the operation of the control device having the above configuration will be described with reference to the flowchart of FIG. First, it is assumed that, for example, the operation of the cooling operation is performed by the remote controller 8. The indoor unit controller 8 reads the room temperature detected by the indoor temperature sensor 11, the set temperature and the operation mode by the remote controller 8 (step ST1), and determines the operation frequency (the number of revolutions) of the compressor 1 based on the difference between the set temperature and the room temperature. Is determined (step ST2), the operation speed, the operation mode (cooling operation), and the like are transmitted to the outdoor unit control unit 20, and the rotation of the indoor fan 9 is controlled.
【００２２】室外機制御部２０は、室内機制御部６から
の指令にしたがって圧縮機１、四方弁２、電子膨張弁５
および室外ファン１０等を制御する。このようにして、
リモコン８の設定操作に応じた室温コントロールを行
う。The outdoor unit controller 20 controls the compressor 1, the four-way valve 2, the electronic expansion valve 5 according to a command from the indoor unit controller 6.
And the outdoor fan 10 and the like are controlled. In this way,
A room temperature control corresponding to the setting operation of the remote controller 8 is performed.
【００２３】このとき、室外機制御部２０は、圧縮機１
の運転回転数に対応する周波数ゾーンを判断し（ステッ
プＳＴ３）、この周波数ゾーンに応じた固定パルスを上
記表１を参照して読み出し、この固定パルスにしたがっ
て電子膨張弁５の開閉度合を制御する（ステップＳＴ
４）。At this time, the outdoor unit controller 20 controls the compressor 1
Is determined (step ST3), a fixed pulse corresponding to this frequency zone is read out with reference to Table 1, and the degree of opening and closing of the electronic expansion valve 5 is controlled according to the fixed pulse. (Step ST
4).
【００２４】続いて、室内機制御部６からの運転回転数
指示が変化した否かを判断し、圧縮機１の運転回転数が
変更されたか否かを判断する。運転回転数が変更される
と、ステップＳＴ５からＳＴ６に進み、今回変更された
運転回転数に対応する周波数ゾーンを判断する。なお、
運転回転数の指示に変更がなければ、電子膨張弁５の開
閉度合を現状維持とする。すなわち、圧縮機１の運転回
転数が変更されないということは、室温が設定温度付近
にあり、当該冷凍サイクルが安定した状態にあるからで
ある。Subsequently, it is determined whether or not the operation speed instruction from the indoor unit controller 6 has changed, and whether or not the operation speed of the compressor 1 has been changed. When the operating speed is changed, the process proceeds from step ST5 to ST6, and the frequency zone corresponding to the operating speed changed this time is determined. In addition,
If there is no change in the operation speed instruction, the opening / closing degree of the electronic expansion valve 5 is maintained as it is. That is, the fact that the operating rotation speed of the compressor 1 is not changed is because the room temperature is near the set temperature and the refrigeration cycle is in a stable state.
【００２５】圧縮機１の運転回転数が変更された場合
は、ステップＳＴ６からＳＴ７に進み、前回の運転回転
数に対応した周波数ゾーンと今回の運転回転数に対応し
た周波数ゾーンとのステップ差Ｓを算出する。ステップ
差Ｓが所定値より大きくないと、ステップＳＴ８からＳ
Ｔ９に進み、運転回転数の変更に応じたパルス、つま
り、今回運転回転数の周波数ゾーンに対応した固定パル
スと前回の固定パルスの差分の所定パルスを算出し、電
子膨張弁５の現固定パルスにその所定パルスを加味して
電子膨張弁５を制御する。If the operating speed of the compressor 1 has been changed, the process proceeds from step ST6 to ST7, where the step difference S between the frequency zone corresponding to the previous operating speed and the frequency zone corresponding to the current operating speed is obtained. Is calculated. If the step difference S is not larger than the predetermined value, the process proceeds from step ST8 to step S8.
Proceeding to T9, a pulse corresponding to the change in the operating speed, that is, a predetermined pulse of a difference between the fixed pulse corresponding to the frequency zone of the current operating speed and the previous fixed pulse is calculated, and the current fixed pulse of the electronic expansion valve 5 is calculated. The electronic expansion valve 5 is controlled in consideration of the predetermined pulse.
【００２６】例えば、前回の運転回転数が周波数ゾーン
Ｅにあり、今回の運転回転数が周波数ゾーンＦに入った
場合では、電子膨張弁５の固定パルスを２５パルスから
２９パルスにするため、その差分である４パルスを現固
定パルスの２５パルスに加算して電子膨張弁５の開閉度
合を制御する。なお、運転回転数が下降した場合であっ
ても、上記上昇時と同様の制御を行う。For example, when the previous operation speed is in the frequency zone E and the current operation speed is in the frequency zone F, the fixed pulse of the electronic expansion valve 5 is changed from 25 pulses to 29 pulses. The opening / closing degree of the electronic expansion valve 5 is controlled by adding the difference of 4 pulses to the current 25 fixed pulses. In addition, even when the operation speed decreases, the same control as that at the time of the increase is performed.
【００２７】上記ステップＳＴ９の処理を実行した後、
ステップＳＴ５に戻り、当該空気調和機の運転が停止さ
れなければ、上述したステップを繰り返し実行すること
になる。After executing the process of step ST9,
Returning to step ST5, if the operation of the air conditioner is not stopped, the above steps will be repeatedly executed.
【００２８】上記ステップ差Ｓが所定値より大きけれ
ば、ステップＳＴ８からＳＴ１０に進み、今回変更にな
った運転回転数が前回の運転回転数より高いか否か、つ
まり、今回の周波数ゾーンが前回の周波数ゾーンより上
であるか否かを判断して運転回転数の上昇、下降を確認
する。If the step difference S is larger than the predetermined value, the process proceeds from step ST8 to step ST10 to determine whether or not the operation speed changed this time is higher than the previous operation speed, that is, the current frequency zone is Judgment is made as to whether or not the frequency is above the frequency zone, and increase and decrease of the operating speed are confirmed.
【００２９】運転回転数が上昇である場合、ステップＳ
Ｔ１０からＳＴ１１に進み、変更後の固定パルスにあら
かじめ設定している所定値（所定割合）を加算し、通常
よりも大きな値のパルスを一時的な固定パルス（開閉度
合）とする。なお、上記所定値としては、例えば、現固
定パルスと変更後の固定パルスとのパルス差の半分程度
とする。If the operating rotational speed is increasing, step S
The process proceeds from T10 to ST11, where a predetermined value (predetermined ratio) set in advance is added to the fixed pulse after the change, and a pulse having a value larger than usual is set as a temporary fixed pulse (opening / closing degree). The predetermined value is, for example, about half the pulse difference between the current fixed pulse and the changed fixed pulse.
【００３０】すなわち、圧縮機１の実運転回転数が急激
に上昇する時に電子膨張弁５の絞りがきついと、プルダ
ウン（一時的な低圧圧力の低下）が大きくなり、蒸発器
の温度が０℃以下になることがある。これにより、蒸発
器が結氷し暖房能力が低下したり、また、誤動作（除霜
に入ってしまう）する等の不具合を招きかねない。That is, if the throttle of the electronic expansion valve 5 is tight when the actual operating speed of the compressor 1 sharply increases, the pull-down (temporary decrease in low pressure) increases, and the temperature of the evaporator becomes 0 ° C. May be: As a result, the evaporator may be frozen and the heating capacity may be reduced, or malfunctions (defrosting may occur) may be caused.
【００３１】例えば、前回の運転回転数が周波数ゾーン
Ｆにあり、今回の運転回転数が周波数ゾーンＪに入った
場合、前回の固定パルスが２９パルスであり、今回の固
定パルスが４７パルスであることから、今回の固定パル
スの４７パルスに９パルスを加算した５６パルスを一旦
固定パルスとし、電子膨張弁５の開閉度合を５６パルス
に合わせる制御をする。For example, when the previous operation speed is in the frequency zone F and the current operation speed is in the frequency zone J, the previous fixed pulse is 29 pulses and the current fixed pulse is 47 pulses. Therefore, 56 pulses obtained by adding 9 pulses to 47 pulses of the current fixed pulse are temporarily set as fixed pulses, and control is performed to adjust the degree of opening and closing of the electronic expansion valve 5 to 56 pulses.
【００３２】また、運転回転数が下降である場合では、
ステップＳＴ１０からＳＴ１２に進み、現固定パルスを
維持する。In the case where the operating speed is decreasing,
The process proceeds from step ST10 to ST12 to maintain the current fixed pulse.
【００３３】続いて、圧縮機１の運転回転数が室内機制
御部６からの指示された回転数になっているか否かを判
断し（ステップＳＴ１３）、運転回転数が指示回転数に
なると、内部タイマ２０ｂの所定時間タイマをスタート
し（ステップＳＴ１４）、タイマのタムアップにより現
固定パルス（所定値を加味したパルス）を現周波数ゾー
ンに対応する固定パルスとするために、電子膨張弁５を
所定パルス分だけ制御する（ステップＳＴ１５，ＳＴ１
６）。Subsequently, it is determined whether or not the operating speed of the compressor 1 is the speed specified by the indoor unit controller 6 (step ST13). A predetermined time timer of the internal timer 20b is started (step ST14), and the electronic expansion valve 5 is set to a predetermined time in order to make the current fixed pulse (a pulse in which a predetermined value is added) a fixed pulse corresponding to the current frequency zone by the timer up. Control is performed for the number of pulses (steps ST15 and ST1).
6).
【００３４】例えば、上述したように、固定パルスを一
旦５６パルスとしている場合、電子膨張弁５を固定パル
スの４７パルスに制御するために、現固定パルスの５６
パルスに９パルスを減算し、電子膨張弁５の開閉度合を
４７パルスに合わせる制御を行う。上記ステップＳＴ１
６の処理を実行した後、ステップＳＴ５に戻り、当該空
気調和機の運転が停止されなければ、上述したステップ
を繰り返し実行することになる。For example, as described above, when the fixed pulse is once set to 56 pulses, in order to control the electronic expansion valve 5 to 47 fixed pulses, the current fixed pulse is set to 56 pulses.
9 pulses are subtracted from the pulses, and control is performed to adjust the opening / closing degree of the electronic expansion valve 5 to 47 pulses. Step ST1 above
After performing the process in step 6, the process returns to step ST5, and if the operation of the air conditioner is not stopped, the above-described steps are repeatedly performed.
【００３５】このように、圧縮機１の運転回転数（周波
数）領域を複数の周波数ゾーンに分け、電子膨張弁５の
開閉度合をその周波数ゾーンに応じて一意的に制御して
いることから、膨張弁の開閉度合の制御頻度が従来より
低下する。したがって、膨張弁の耐久性が増すことにな
り、ひいては当該空気調和機の信頼性が向上する。As described above, the operating speed (frequency) region of the compressor 1 is divided into a plurality of frequency zones, and the degree of opening and closing of the electronic expansion valve 5 is uniquely controlled according to the frequency zone. The frequency of controlling the degree of opening / closing of the expansion valve is lower than before. Therefore, the durability of the expansion valve is increased, and the reliability of the air conditioner is improved.
【００３６】また、サクション温度、室内熱交温度や室
外熱交温度を用いないことから、温度センサによる検出
誤差による室温コントロールの精度低下もなくなり、高
精度化を図るとともに、その分コストダウンを図ること
ができる。Further, since the suction temperature, the indoor heat exchange temperature and the outdoor heat exchange temperature are not used, the accuracy of the room temperature control does not decrease due to the detection error of the temperature sensor, and the accuracy and the cost are reduced accordingly. be able to.
【００３７】なお、上述した実施例では冷房運転の場合
について説明したが、上記表１等から明かなように、ド
ライ運転や暖房運転であっても、同様の制御によって実
現することができる。In the above-described embodiment, the case of the cooling operation has been described. However, as apparent from Table 1 and the like, the same control can be realized in the dry operation or the heating operation.
【００３８】[0038]
【発明の効果】以上説明したように、本発明は以下のよ
うな効果を奏する。本発明は、冷凍サイクルを構成する
電子膨張弁の開閉度合を制御して同冷凍サイクルを運転
して室温コントロールを行う空気調和機の制御方法にお
いて、圧縮機の運転回転数領域を複数の周波数ゾーンに
分けるとともに、各周波数ゾーン毎に電子膨張弁の開閉
度合を設定し、かつ、これらをテーブル化して記憶し、
冷凍サイクルの運転時には、圧縮機の運転回転数に対応
する周波数ゾーンを選択し、このテーブルを参照して得
た開閉度合により電子膨張弁を制御して運転回転数によ
り弁の開閉度合を一意的に決定していることから、サク
ション温度と蒸発温度との温度差等を用いた場合と比較
して電子膨張弁の開閉度合制御の頻度が少なくて済む。
したがって、電子膨張弁の耐久性を高めるだけなく、冷
凍サイクルの安定化も図れ、ひいては当該空気調和機の
信頼性を向上させることができるとともに、温度センサ
を省いた分コストダウンを図ることができるという効果
がある。As described above, the present invention has the following effects. The present invention relates to a method for controlling an air conditioner in which the degree of opening and closing of an electronic expansion valve constituting a refrigeration cycle is controlled and the refrigeration cycle is operated to control room temperature. And the degree of opening and closing of the electronic expansion valve is set for each frequency zone, and these are tabulated and stored.
During operation of the refrigeration cycle, a frequency zone corresponding to the operating speed of the compressor is selected, and the electronic expansion valve is controlled by the opening / closing degree obtained by referring to this table, and the opening / closing degree of the valve is uniquely determined by the operating speed. Therefore, the frequency of opening / closing degree control of the electronic expansion valve can be reduced as compared with the case where the temperature difference between the suction temperature and the evaporation temperature is used.
Therefore, not only can the durability of the electronic expansion valve be improved, but also the refrigeration cycle can be stabilized, and the reliability of the air conditioner can be improved, and the cost can be reduced by eliminating the temperature sensor. This has the effect.
【図１】本発明の一実施の形態を示し、空気調和機の制
御方法の実施例を説明するための概略的フローチャート
図。FIG. 1 is a schematic flow chart illustrating an embodiment of the present invention and illustrating an example of a method for controlling an air conditioner.
【図２】本発明の一実施の形態を示し、空気調和機の制
御方法が適用される制御装置の概略的ブロック線図。FIG. 2 is a schematic block diagram of a control device according to the embodiment of the present invention, to which the control method of the air conditioner is applied.
【図３】図２に示す制御装置の動作を説明するための概
略的模式図。FIG. 3 is a schematic diagram illustrating the operation of the control device shown in FIG. 2;
【図４】従来の空気調和機の冷凍サイクルを説明するた
めの概略的構成図。FIG. 4 is a schematic configuration diagram for explaining a refrigeration cycle of a conventional air conditioner.
【図５】従来の空気調和機の制御装置を説明するための
概略的ブロック線図。FIG. 5 is a schematic block diagram for explaining a conventional control device for an air conditioner.
１ 圧縮機 ５ 膨張弁（電子膨張弁；弁手段） ６ 室内機制御部 ７，２０ 室外機制御部 ２０ａ 内部メモリ ２０ｂ 内部タイマ Ｓ ステップ差 Reference Signs List 1 compressor 5 expansion valve (electronic expansion valve; valve means) 6 indoor unit control unit 7, 20 outdoor unit control unit 20a internal memory 20b internal timer S step difference
Claims (5)
合を制御して同冷凍サイクルを運転し、室温コントロー
ルを行う空気調和機の制御方法において、前記冷凍サイ
クルを構成する圧縮機の運転回転数領域を複数の周波数
ゾーンに分けるとともに、各周波数ゾーン毎に前記弁手
段の開閉度合を設定し、かつ、これらをテーブル化して
記憶し、前記冷凍サイクルの運転時には、前記圧縮機の
運転回転数に対応する周波数ゾーンを選択し、前記テー
ブルを参照して前記選択周波数ゾーンに応じた開閉度合
を読み出すとともに、前記弁手段を前記読み出した開閉
度合に制御するようにしたことを特徴とする空気調和機
の制御方法。1. A method for controlling an air conditioner that controls the degree of opening and closing of valve means constituting a refrigeration cycle to operate the refrigeration cycle and control room temperature, wherein the operating speed of a compressor constituting the refrigeration cycle is controlled. While dividing the region into a plurality of frequency zones, the degree of opening and closing of the valve means is set for each frequency zone, and these are tabulated and stored, and when the refrigeration cycle is operating, the operating speed of the compressor is An air conditioner wherein a corresponding frequency zone is selected, an opening / closing degree corresponding to the selected frequency zone is read out with reference to the table, and the valve means is controlled to the readout opening / closing degree. Control method.
の運転周波数の上昇時と下降時で異ならせ、前記運転周
波数の上昇時よりも下降時を低くしてなる請求項１に記
載の空気調和機の制御方法。2. The air according to claim 1, wherein the plurality of frequency zones are different between when the operating frequency of the compressor is increased and when the operating frequency is decreased, and the time when the operating frequency is decreased is lower than when the operating frequency is increased. Harmonizer control method.
く、この変更前の運転回転数に対応する周波数ゾーンと
変更後の運転回転数に対応する周波数ゾーンとのステッ
プ数差が所定値より大きい場合には、前記弁手段を、一
旦所定値の開閉度合とし、しかる後、前記弁手段を変更
後の運転回転数に対応する開閉度合に制御するようにし
た請求項１または２に記載の空気調和機の制御方法。3. The change in the operating speed of the compressor is large, and the difference in the step number between the frequency zone corresponding to the operating speed before the change and the frequency zone corresponding to the operating speed after the change is greater than a predetermined value. 3. The valve according to claim 1, wherein when the value is larger, the valve means is once set to an opening / closing degree of a predetermined value, and then the valve means is controlled to the opening / closing degree corresponding to the changed operation speed. 4. Control method of air conditioner.
には、前記弁手段の変更後の開閉度合に所定割合を加算
し、あるいは、前記運転回転数の変更が下降であるとき
には前記弁手段の現開閉度合を維持し、該弁手段の開閉
度合を所定時間保持した後に同弁手段を変更後の運転回
転数に対応する開閉度合に制御するようにした請求項３
に記載の空気調和機の制御方法。4. When the change in the operating speed is increasing, a predetermined ratio is added to the opening / closing degree after the change of the valve means, or when the change in the operating speed is decreasing, the valve means of the valve means is changed. 4. The valve according to claim 3, wherein the opening / closing degree of the valve means is maintained for a predetermined period of time after maintaining the current opening / closing degree for a predetermined time.
The method for controlling an air conditioner according to item 1.
し、あるいは、前記弁手段の変更後の開閉度合に所定割
合を加算し、もしくは、前記弁手段の現開閉度合を維持
した場合には、前記圧縮機の実運転回転数が変更運転回
転数となり、しかる後に所定時間が経過したときに、前
記弁手段を前記変更後の運転回転数に対応する周波数ゾ
ーンの開閉度合に制御するようにした請求項３または４
に記載の空気調和機の制御方法。5. The method according to claim 1, wherein the valve means is once set to a predetermined opening / closing degree, or a predetermined ratio is added to the changed opening / closing degree of the valve means, or the current opening / closing degree of the valve means is maintained. The actual operating speed of the compressor becomes the changed operating speed, and when a predetermined time has elapsed after that, the valve means is controlled to the opening / closing degree of the frequency zone corresponding to the changed operating speed. Claim 3 or 4
The method for controlling an air conditioner according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001140886A JP2002333189A (en) | 2001-05-11 | 2001-05-11 | Method of controlling air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001140886A JP2002333189A (en) | 2001-05-11 | 2001-05-11 | Method of controlling air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002333189A true JP2002333189A (en) | 2002-11-22 |
Family
ID=18987410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001140886A Withdrawn JP2002333189A (en) | 2001-05-11 | 2001-05-11 | Method of controlling air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002333189A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009162425A (en) * | 2008-01-07 | 2009-07-23 | Hoshizaki Electric Co Ltd | Cooling storage |
| US20120017620A1 (en) * | 2009-01-20 | 2012-01-26 | Panasonic Corporation | Refrigeration cycle apparatus |
| CN104024763A (en) * | 2011-11-30 | 2014-09-03 | 夏普株式会社 | Air conditioner and method for controlling opening of expansion valve thereof |
| CN111547091A (en) * | 2020-05-22 | 2020-08-18 | 中车株洲电力机车有限公司 | Compressor control method of variable-frequency air conditioner of railway vehicle |
-
2001
- 2001-05-11 JP JP2001140886A patent/JP2002333189A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009162425A (en) * | 2008-01-07 | 2009-07-23 | Hoshizaki Electric Co Ltd | Cooling storage |
| US20120017620A1 (en) * | 2009-01-20 | 2012-01-26 | Panasonic Corporation | Refrigeration cycle apparatus |
| CN104024763A (en) * | 2011-11-30 | 2014-09-03 | 夏普株式会社 | Air conditioner and method for controlling opening of expansion valve thereof |
| CN104024763B (en) * | 2011-11-30 | 2016-01-27 | 夏普株式会社 | The aperture control method of the expansion valve of air conditioner and air conditioner |
| CN111547091A (en) * | 2020-05-22 | 2020-08-18 | 中车株洲电力机车有限公司 | Compressor control method of variable-frequency air conditioner of railway vehicle |
| CN111547091B (en) * | 2020-05-22 | 2021-05-11 | 中车株洲电力机车有限公司 | Compressor control method of variable-frequency air conditioner of railway vehicle |
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