JP2000154954A - Control method of air conditioner - Google Patents
Control method of air conditionerInfo
- Publication number
- JP2000154954A JP2000154954A JP10330426A JP33042698A JP2000154954A JP 2000154954 A JP2000154954 A JP 2000154954A JP 10330426 A JP10330426 A JP 10330426A JP 33042698 A JP33042698 A JP 33042698A JP 2000154954 A JP2000154954 A JP 2000154954A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- compressor
- heat exchanger
- set temperature
- air conditioner
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気調和機の制御
方法に係わり、とくに冷媒不足を早期に検出して圧縮機
を保護するものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an air conditioner, and more particularly to a method for protecting a compressor by detecting a shortage of refrigerant at an early stage.
【０００２】[0002]
【従来の技術】従来、圧縮機１、室内熱交換器４、絞り
機構５、室外熱交換器３を順次循環する冷凍サイクルを
有し、冷房運転および暖房運転を可能とした空気調和機
の制御方法は、図４のフローチャートに示すように、そ
の暖房運転開始（ＳＴ０’）して、１５分経過（ＳＴ
２）後、圧縮機１のケースまたは吐出口の温度を検出
し、同圧縮機の温度Ｔcmp が圧縮機の所定の第１の設定
温度Ｔoff を超えた（ＳＴ３’）場合にのみ冷媒不足と
判断して圧縮機１の動作を停止（ＳＴ４’）して圧縮機
１を保護するようにしていた。しかし、この制御方法で
は、外気温度が低い場合、圧縮機の温度が急速には上昇
しないため上記保護動作が遅れ、その間冷媒不足の状態
で圧縮機が運転されてしまうので、圧縮機の給気圧力が
低下して過負荷状態となり圧縮機を損傷する可能性があ
った。2. Description of the Related Art Conventionally, an air conditioner having a refrigeration cycle that sequentially circulates a compressor 1, an indoor heat exchanger 4, a throttle mechanism 5, and an outdoor heat exchanger 3 to enable a cooling operation and a heating operation. As shown in the flow chart of FIG. 4, the method starts the heating operation (ST0 '), and after 15 minutes (ST0').
2) After that, the temperature of the case or the discharge port of the compressor 1 is detected, and it is determined that the refrigerant is insufficient only when the temperature Tcmp of the compressor exceeds a predetermined first set temperature Toff of the compressor (ST3 '). Then, the operation of the compressor 1 is stopped (ST4 ') to protect the compressor 1. However, in this control method, when the outside air temperature is low, the above-described protection operation is delayed because the temperature of the compressor does not rise rapidly, and the compressor is operated in a state where the refrigerant is insufficient during that time. There was a possibility that the pressure was reduced and the compressor was damaged due to overload.
【０００３】[0003]
【発明が解決しようとする課題】本発明は以上述べた問
題点を解決し、外気温度の如何に係わらず冷媒不足を早
期に判断して圧縮機を保護するようにした空気調和機の
制御方法を提供することを目的としている。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and a method of controlling an air conditioner in which a compressor shortage is determined by early judging refrigerant shortage regardless of the outside air temperature. It is intended to provide.
【０００４】[0004]
【課題を解決するための手段】本発明は上述の課題を解
決するため、圧縮機、室内熱交換器、絞り機構、室外熱
交換器を順次循環する冷凍サイクルを有し、冷房運転お
よび暖房運転を可能とした空気調和機における暖房運転
開始してから所定時間経過後、圧縮機のケースまたは吐
出口の温度を検出し、同圧縮機の温度が設定温度を超え
た場合に冷媒不足と判断し、圧縮機の動作を停止して保
護するようにしてなる空気調和機の制御方法において、
前記圧縮機の設定温度より低い第２の設定温度と、前記
室内熱交換器の設定温度とを設けると共に、前記室内熱
交換器の中間温度を検出し、暖房運転開始してから所定
時間経過後、前記圧縮機の温度が第２の設定温度を超
え、なお且つ前記室内熱交換器の中間温度が設定温度よ
り低い場合に冷媒不足と判断して圧縮機の動作を停止す
るようにした空気調和機の制御方法としている。In order to solve the above-mentioned problems, the present invention has a refrigeration cycle for sequentially circulating a compressor, an indoor heat exchanger, a throttle mechanism, and an outdoor heat exchanger, and performs a cooling operation and a heating operation. After a lapse of a predetermined time from the start of the heating operation in the air conditioner that has enabled the temperature of the compressor, the temperature of the case or the discharge port of the compressor is detected. In a control method of an air conditioner configured to stop and protect the operation of the compressor,
A second set temperature lower than the set temperature of the compressor and a set temperature of the indoor heat exchanger are provided, and an intermediate temperature of the indoor heat exchanger is detected, and after a lapse of a predetermined time from the start of the heating operation, An air conditioner configured to determine that the refrigerant is insufficient and stop the operation of the compressor when the temperature of the compressor exceeds a second set temperature and the intermediate temperature of the indoor heat exchanger is lower than the set temperature. Machine control method.
【０００５】暖房運転開始してから所定時間経過後、前
記圧縮機の温度が前記第２の設定温度を超え、且つ同圧
縮機の温度と前記室内熱交換器の中間温度との差が所定
温度差以上となった場合に冷媒不足と判断して圧縮機の
動作を停止するようにした空気調和機の制御方法として
いる。After a lapse of a predetermined time from the start of the heating operation, the temperature of the compressor exceeds the second set temperature, and the difference between the temperature of the compressor and the intermediate temperature of the indoor heat exchanger is a predetermined temperature. When the difference is greater than or equal to the difference, the control method of the air conditioner is such that it is determined that the refrigerant is insufficient and the operation of the compressor is stopped.
【０００６】[0006]
【発明の実施の形態】以上のように、本発明の空気調和
機の制御方法においては、圧縮機の設定温度より低い第
２の設定温度と、前記室内熱交換器の設定温度とを設け
ると共に、前記室内熱交換器の中間温度を検出し、暖房
運転開始してから所定時間経過後、前記圧縮機の温度が
第２の設定温度を超え、なお且つ前記室内熱交換器の中
間温度が設定温度より低い場合に冷媒不足と判断して圧
縮機の動作を停止するようにしたので、外気温度が低い
場合等に、圧縮機の温度が圧縮機の許容最大温度である
設定温度を超える前の早期に冷媒不足を判断でき、圧縮
機の破損を確実に防止することができる。As described above, in the method for controlling an air conditioner of the present invention, the second set temperature lower than the set temperature of the compressor and the set temperature of the indoor heat exchanger are provided. Detecting the intermediate temperature of the indoor heat exchanger, and after a lapse of a predetermined time from the start of the heating operation, the temperature of the compressor exceeds a second set temperature, and the intermediate temperature of the indoor heat exchanger is set. When the temperature is lower than the temperature, it is determined that the refrigerant is insufficient and the operation of the compressor is stopped.Therefore, when the outside air temperature is low, the temperature of the compressor before the temperature exceeds the set temperature which is the allowable maximum temperature of the compressor. The refrigerant shortage can be determined at an early stage, and the compressor can be reliably prevented from being damaged.
【０００７】[0007]
【実施例】以下、図面に基づいて本発明による空気調和
機の制御方法を詳細に説明する。図１は本発明による制
御方法を適用する空気調和機の一実施例を示すブロック
図である。図において、１は圧縮機、２は四方弁、３は
室外熱交換器、４は室内熱交換器、５は絞り機構であ
り、冷凍サイクルを形成し、前記四方弁２を切り換える
ことにより冷房運転または暖房運転を可能としている。
また、６は前記圧縮機１のケースまたは吐出口の圧縮機
温度Ｔcmp を検出する圧縮機温度センサである。７は前
記室内熱交換器４の中間部の室内熱交換器温度Ｔrcを検
出する室内熱交換器温度センサである。８は前記圧縮機
温度センサ６よりの検出信号等を入力し、圧縮機１、四
方弁２等を制御する室外制御部である。この室外制御部
８には圧縮機１の許容最大温度である設定温度Ｔoff 、
保護動作を確認するための圧縮機の所定の第２の設定温
度Ｔs2、冷媒不足を判断するための室内熱交換器の設定
温度Ｔs3等を記憶するメモリ、および冷媒不足を判断す
る判断手段を含んでいる。９は前記室内熱交換器温度セ
ンサ７よりの検出信号等を入力し、室内ファン１１を制
御するとともに前記室外制御部８と情報を交換する室内
制御部である。１０は前記室外制御部８に制御されて室
外熱交換器３に送風する室外ファンである。１１は前記
室内ファンである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for controlling an air conditioner according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an air conditioner to which the control method according to the present invention is applied. In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is an indoor heat exchanger, 5 is a throttle mechanism, forms a refrigeration cycle, and performs cooling operation by switching the four-way valve 2. Or heating operation is enabled.
Reference numeral 6 denotes a compressor temperature sensor for detecting a compressor temperature Tcmp of the case or the discharge port of the compressor 1. Reference numeral 7 denotes an indoor heat exchanger temperature sensor for detecting an indoor heat exchanger temperature Trc at an intermediate portion of the indoor heat exchanger 4. Reference numeral 8 denotes an outdoor control unit that inputs a detection signal and the like from the compressor temperature sensor 6 and controls the compressor 1, the four-way valve 2, and the like. This outdoor controller 8 has a set temperature Toff, which is the maximum allowable temperature of the compressor 1,
A memory for storing a predetermined second set temperature Ts2 of the compressor for confirming the protection operation, a set temperature Ts3 of the indoor heat exchanger for judging the shortage of the refrigerant, and the like, and a judging means for judging the shortage of the refrigerant are included. In. Reference numeral 9 denotes an indoor control unit that receives a detection signal and the like from the indoor heat exchanger temperature sensor 7, controls the indoor fan 11, and exchanges information with the outdoor control unit 8. Reference numeral 10 denotes an outdoor fan that is controlled by the outdoor control unit 8 and blows air to the outdoor heat exchanger 3. Reference numeral 11 denotes the indoor fan.
【０００８】図２および図３は、以上の構成を有する空
気調和機の制御方法を説明するフローチャート図であ
る。以下に、同図を参照しながら本発明の空気調和機の
制御方法を詳細に説明するがまず図２について説明す
る。図２の実施例の場合、まず、暖房運転が開始され
（ＳＴ０）、圧縮機が始動され（ＳＴ１）、１５分経過
（ＳＴ２）後、前記圧縮機温度Ｔcmp と予め設定された
所定の第２の設定温度Ｔs2と比較（ＳＴ３）される。
（ＳＴ３）でＴcmp ＞Ｔs2になると、つぎに圧縮機温度
Ｔcmp と設定温度Ｔoff とが比較（ＳＴ４）され、Ｔcm
p ＞Ｔoff であれば冷媒不足と判断して圧縮機の動作を
停止（ＳＴ６）するが、Ｔcmp ＞Ｔoff でなければ、前
記室内熱交換器温度Ｔrcと設定温度Ｔs3とが比較（ＳＴ
５）される。（ＳＴ５）でＴrc＜Ｔs3でなければ（ＳＴ
３）に戻るが、Ｔrc＜Ｔs3であれば冷媒不足と判断して
圧縮機の動作を停止（ＳＴ６）するようにしている。FIG. 2 and FIG. 3 are flowcharts for explaining a control method of the air conditioner having the above configuration. Hereinafter, the control method of the air conditioner of the present invention will be described in detail with reference to FIG. In the case of the embodiment of FIG. 2, first, the heating operation is started (ST0), the compressor is started (ST1), and after a lapse of 15 minutes (ST2), the compressor temperature Tcmp and a predetermined second predetermined value are set. (ST3).
If Tcmp> Ts2 in (ST3), then the compressor temperature Tcmp is compared with the set temperature Toff (ST4), and Tcm
If p> Toff, it is determined that the refrigerant is insufficient and the operation of the compressor is stopped (ST6). If not Tcmp> Toff, the indoor heat exchanger temperature Trc is compared with the set temperature Ts3 (ST6).
5) is done. If Trc <Ts3 in (ST5) (ST5)
Returning to 3), if Trc <Ts3, it is determined that the refrigerant is insufficient, and the operation of the compressor is stopped (ST6).
【０００９】つぎに、図３の実施例について説明する。
本実施例の場合図２の実施例の（ＳＴ３）までは同じで
あり、説明を省略する。（ＳＴ３）でＴcmp ＞Ｔs2にな
ると、つぎに圧縮機温度Ｔcmp と室内熱交換器温度Ｔrc
との差が、冷媒不足を示す所定の温度差ΔＴoff 以上で
あるか比較（ＳＴ７）され、Ｔcmp −Ｔrc＞ΔＴoff で
あれば直ちに圧縮機１の動作を停止（ＳＤＴ６）し、Ｔ
cmp −Ｔrc＞ΔＴoff でなければ、圧縮機温度Ｔcmp と
圧縮機の設定温度Ｔoff とが比較（ＳＴ８）され、Ｔcm
p ＞Ｔoff であれば冷媒不足と判断して圧縮機の動作を
停止（ＳＴ６）するが、Ｔcmp ＞Ｔoff でなければ前記
（ＳＴ３）に戻るようにしている。Next, the embodiment of FIG. 3 will be described.
In the case of the present embodiment, the steps up to (ST3) of the embodiment of FIG. 2 are the same, and a description thereof will be omitted. If Tcmp> Ts2 in (ST3), then the compressor temperature Tcmp and the indoor heat exchanger temperature Trc
Is compared with a predetermined temperature difference ΔToff indicating a shortage of refrigerant (ST7), and if Tcmp−Trc> ΔToff, the operation of the compressor 1 is immediately stopped (SDT6).
If not cmp−Trc> ΔToff, the compressor temperature Tcmp and the set temperature Toff of the compressor are compared (ST8), and Tcm
If p> Toff, it is determined that the refrigerant is insufficient and the operation of the compressor is stopped (ST6). If Tcmp> Toff, the process returns to (ST3).
【００１０】[0010]
【発明の効果】以上説明したように、本発明による空気
調和機の制御方法によれば、圧縮機の設定温度より低い
第２の設定温度と、前記室内熱交換器の設定温度とを設
けると共に、前記室内熱交換器の中間温度を検出し、暖
房運転開始してから所定時間経過後、前記圧縮機の温度
が第２の設定温度を超え、なお且つ前記室内熱交換器の
中間温度が設定温度より低い場合に冷媒不足と判断して
圧縮機の動作を停止するようにしたので、外気温度が低
い場合等に、圧縮機の温度が圧縮機の許容最大温度であ
る設定温度を超える前の早期に冷媒不足を判断でき、圧
縮機の破損を確実に防止することができる。As described above, according to the air conditioner control method of the present invention, the second set temperature lower than the set temperature of the compressor and the set temperature of the indoor heat exchanger are provided. Detecting the intermediate temperature of the indoor heat exchanger, and after a lapse of a predetermined time from the start of the heating operation, the temperature of the compressor exceeds a second set temperature, and the intermediate temperature of the indoor heat exchanger is set. When the temperature is lower than the temperature, it is determined that the refrigerant is insufficient and the operation of the compressor is stopped.Therefore, when the outside air temperature is low, the temperature of the compressor before the temperature exceeds the set temperature which is the allowable maximum temperature of the compressor. The refrigerant shortage can be determined at an early stage, and the compressor can be reliably prevented from being damaged.
【図１】本発明による制御方法を適用する空気調和機の
一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of an air conditioner to which a control method according to the present invention is applied.
【図２】本発明による空気調和機の制御方法の一実施例
を示すフローチャート図である。FIG. 2 is a flowchart illustrating an embodiment of a method for controlling an air conditioner according to the present invention.
【図３】本発明による空気調和機の制御方法の他の実施
例を示すフローチャート図である。FIG. 3 is a flowchart showing another embodiment of the control method of the air conditioner according to the present invention.
【図４】従来の空気調和機の制御方法を示すフローチャ
ート図である。FIG. 4 is a flowchart illustrating a conventional method for controlling an air conditioner.
１ 圧縮機 ２ 四方弁 ３ 室外熱交換器 ４ 室内熱交換器 ５ 絞り機構 ６ 圧縮機温度センサ ７ 室内熱交換器温度センサ ８ 室外制御部 ９ 室内制御部 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Indoor heat exchanger 5 Throttle mechanism 6 Compressor temperature sensor 7 Indoor heat exchanger temperature sensor 8 Outdoor control part 9 Indoor control part
Claims (2)
熱交換器を順次循環する冷凍サイクルを有し、冷房運転
および暖房運転を可能とした空気調和機における暖房運
転開始してから所定時間経過後、圧縮機のケースまたは
吐出口の温度を検出し、同圧縮機の温度が設定温度を超
えた場合に冷媒不足と判断し、圧縮機の動作を停止して
保護するようにしてなる空気調和機の制御方法におい
て、前記圧縮機の設定温度より低い第２の設定温度を設
定すると共に、前記室内熱交換器の中間温度を検出し、
暖房運転開始してから所定時間経過後、前記圧縮機の温
度が第２の設定温度を超え、なお且つ前記室内熱交換器
の中間温度が設定温度より低い場合に冷媒不足と判断し
て圧縮機の動作を停止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。An air conditioner having a refrigeration cycle that sequentially circulates a compressor, an indoor heat exchanger, a throttle mechanism, and an outdoor heat exchanger, and is capable of performing a cooling operation and a heating operation. After a lapse of time, the temperature of the case or the discharge port of the compressor is detected, and when the temperature of the compressor exceeds the set temperature, it is determined that the refrigerant is insufficient, and the operation of the compressor is stopped to protect the compressor. In the control method of the air conditioner, a second set temperature lower than the set temperature of the compressor is set, and an intermediate temperature of the indoor heat exchanger is detected,
After a lapse of a predetermined time from the start of the heating operation, when the temperature of the compressor exceeds the second set temperature and the intermediate temperature of the indoor heat exchanger is lower than the set temperature, it is determined that the refrigerant is insufficient and the compressor is A method for controlling an air conditioner, wherein the operation of the air conditioner is stopped.
前記圧縮機の温度が前記第２の設定温度を超え、且つ同
圧縮機の温度と前記室内熱交換器の中間温度との差が所
定温度差以上となった場合に冷媒不足と判断して圧縮機
の動作を停止するようにしたことを特徴とする請求項１
記載の空気調和機の制御方法。2. After a lapse of a predetermined time from the start of the heating operation,
When the temperature of the compressor exceeds the second set temperature and the difference between the temperature of the compressor and the intermediate temperature of the indoor heat exchanger is equal to or greater than a predetermined temperature difference, it is determined that the refrigerant is insufficient and compression is performed. 2. The operation of the machine is stopped.
The control method of the air conditioner according to the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10330426A JP2000154954A (en) | 1998-11-20 | 1998-11-20 | Control method of air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10330426A JP2000154954A (en) | 1998-11-20 | 1998-11-20 | Control method of air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000154954A true JP2000154954A (en) | 2000-06-06 |
Family
ID=18232489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10330426A Pending JP2000154954A (en) | 1998-11-20 | 1998-11-20 | Control method of air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000154954A (en) |
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| US7552596B2 (en) | 2004-12-27 | 2009-06-30 | Carrier Corporation | Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication |
| JP2009222247A (en) * | 2008-03-13 | 2009-10-01 | Aisin Seiki Co Ltd | Air conditioner and its control method |
| US7712319B2 (en) | 2004-12-27 | 2010-05-11 | Carrier Corporation | Refrigerant charge adequacy gauge |
| US8290722B2 (en) | 2006-12-20 | 2012-10-16 | Carrier Corporation | Method for determining refrigerant charge |
| WO2014068819A1 (en) * | 2012-10-31 | 2014-05-08 | ダイキン工業株式会社 | Air conditioner |
| US9568226B2 (en) | 2006-12-20 | 2017-02-14 | Carrier Corporation | Refrigerant charge indication |
| US9759465B2 (en) | 2011-12-27 | 2017-09-12 | Carrier Corporation | Air conditioner self-charging and charge monitoring system |
-
1998
- 1998-11-20 JP JP10330426A patent/JP2000154954A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7472557B2 (en) | 2004-12-27 | 2009-01-06 | Carrier Corporation | Automatic refrigerant charging apparatus |
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