JPH05231754A - Operational failure detection device for air conditioner - Google Patents
Operational failure detection device for air conditionerInfo
- Publication number
- JPH05231754A JPH05231754A JP4086697A JP8669792A JPH05231754A JP H05231754 A JPH05231754 A JP H05231754A JP 4086697 A JP4086697 A JP 4086697A JP 8669792 A JP8669792 A JP 8669792A JP H05231754 A JPH05231754 A JP H05231754A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermistor
- air conditioner
- compressor
- discharge temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はサーミスタを用いて圧
縮機からの吐出温度制御を行う場合等に使用するのに好
適なエアコンの異常検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting device for an air conditioner suitable for use when controlling a discharge temperature from a compressor using a thermistor.
【０００２】[0002]
【従来の技術】電動弁を利用して圧縮機からの吐出温度
を制御し、これにより間接的に過熱度制御を行う方式
は、特願平２−６８６６０号にて提案されている。この
圧縮機の吐出温度制御方式においては、上記吐出温度を
サーミスタで検出するようにしており、このサーミスタ
は吐出配管の表面に取着された感温筒内に挿入して配置
してある。2. Description of the Related Art A system in which a discharge temperature from a compressor is controlled by using an electric valve to indirectly control a superheat degree is proposed in Japanese Patent Application No. 2-68660. In the discharge temperature control method of this compressor, the discharge temperature is detected by a thermistor, and the thermistor is inserted and arranged in a temperature sensitive cylinder attached to the surface of the discharge pipe.
【０００３】ところで上記のサーミスタが不良を起こせ
ば、システムとしては成立しなくなる。このサーミスタ
の不良は主に以下の２つがあると考えられる。すなわち
サーミスタのショートや断線と、感温筒からのサーミス
タの抜けや外れである。However, if the thermistor fails, the system will not work. It is considered that there are mainly the following two defects in this thermistor. That is, the thermistor is short-circuited or disconnected, and the thermistor is pulled out or detached from the temperature sensing tube.
【０００４】このうち上記サーミスタのショートや断線
は、以下のようにして検出することが可能である。すな
わち図２に示すように、サーミスタＴＨをバイアス抵抗
Ｒ１と直列に接続し、その接続点をシステムの制御を行
うマイコン１のＡ／Ｄポートに接続して、検出温度に応
じたアナログの電圧値をＡ／Ｄポートに入力するのであ
る。この構成によれば、サーミスタＴＨが断線した場合
には、マイコン１のＡ／Ｄポートの入力電圧は０Ｖとな
り、またサーミスタＴＨがショートした場合には、Ａ／
Ｄポートには電源電圧Ｖがそのまま入力されるため、サ
ーミスタＴＨ自体の異常（不良）をマイコン１側で検出
することができることになる。Of these, the short circuit and disconnection of the thermistor can be detected as follows. That is, as shown in FIG. 2, the thermistor TH is connected in series with the bias resistor R 1 and the connection point is connected to the A / D port of the microcomputer 1 that controls the system to obtain an analog voltage corresponding to the detected temperature. The value is input to the A / D port. According to this configuration, when the thermistor TH is disconnected, the input voltage of the A / D port of the microcomputer 1 becomes 0V, and when the thermistor TH is shorted, A / D
Since the power supply voltage V is directly input to the D port, the abnormality (defective) of the thermistor TH itself can be detected by the microcomputer 1 side.
【０００５】[0005]
【発明が解決しようとする課題】ところでサーミスタＴ
Ｈの感温筒からの抜けや外れが生じた場合には、サーミ
スタＴＨの温度検出によって電動弁を制御するため、実
際よりもサーミスタＴＨの抵抗値が低くなり、電動弁を
閉じる→吐出温度上昇→オーバーロード作動となって、
エアコンが止まってしまうことになる。The thermistor T
When H comes off or comes off from the temperature sensitive cylinder, the motor valve is controlled by the temperature detection of the thermistor TH, so the resistance value of the thermistor TH becomes lower than it actually is, and the motor valve is closed → discharge temperature rises → Overload operation,
The air conditioner will stop.
【０００６】そこでサーミスタＴＨの吐出配管に設けた
感温筒からの抜けや外れ等の対策として、サーミスタＴ
Ｈをかしめて固定することが考えられる。この場合、サ
ーミスタＴＨを感温筒にかしめて取付けるため、サーミ
スタＴＨの交換をすることが非常に難しくなる。[0006] Therefore, as a countermeasure against the detachment or disengagement from the temperature sensitive tube provided in the discharge pipe of the thermistor TH, the thermistor T
It is possible to caulk and fix H. In this case, since the thermistor TH is caulked and attached to the temperature sensitive cylinder, it becomes very difficult to replace the thermistor TH.
【０００７】この発明は上記従来の欠点を解決するため
になされたものであって、その目的は、エアコンの信頼
性を向上させることができるエアコンの異常検出装置を
提供することにある。The present invention has been made to solve the above-mentioned conventional drawbacks, and an object thereof is to provide an abnormality detecting device for an air conditioner which can improve the reliability of the air conditioner.
【０００８】[0008]
【課題を解決するための手段】そこでこの発明のエアコ
ンの異常検出装置は、圧縮機からの吐出温度をサーミス
タＴＨにて検出するエアコンにおいて、上記サーミスタ
ＴＨによる検出温度Ｔと凝縮器での凝縮温度Ｔｃとを比
較すると共に、検出温度Ｔが凝縮温度Ｔｃよりも低い場
合に異常信号を出力する異常検出手段２を設けたことを
特徴としている。Therefore, an abnormality detecting device for an air conditioner according to the present invention is an air conditioner in which a discharge temperature from a compressor is detected by a thermistor TH, and a temperature T detected by the thermistor TH and a condensing temperature in a condenser. It is characterized in that the abnormality detection means 2 is provided for comparing with Tc and outputting an abnormality signal when the detected temperature T is lower than the condensation temperature Tc.
【０００９】[0009]
【作用】上記エアコンの異常検出装置においては、サー
ミスタＴＨが吐出配管から外れた場合には、検出温度Ｔ
が凝縮温度Ｔｃまでには上昇しないことになるので異常
信号が出力される。したがってその出力信号によりエア
コンを停止し、異常であることを表示したり、またサー
ミスタＴＨを用いないですむオープン制御に切り替える
等の処置が可能となる。In the above air conditioner abnormality detection device, when the thermistor TH comes off the discharge pipe, the detected temperature T
Does not rise to the condensing temperature Tc, an abnormal signal is output. Therefore, it is possible to take measures such as stopping the air conditioner by the output signal to display an abnormality and switching to open control without using the thermistor TH.
【００１０】[0010]
【実施例】次にこの発明のエアコンの異常検出装置の具
体的な実施例について、図面を参照しつつ詳細に説明す
る。この発明は圧縮機の吐出配管に蝋付け等にて付設し
た感温筒からのサーミスタの抜けや外れを、吐出配管の
吐出温度Ｔと、熱交換器における凝縮温度Ｔｃとを比較
することにより判定するようにしたものである。そして
サーミスタの抜けや外れがあると検出判定した場合に
は、その検出信号によりエアコンの作動を停止し、異常
であることを示す表示を行う。また他の方法としては、
サーミスタを用いないですむオープン制御に切り替える
等の処置を行うようにしている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of an abnormality detecting device for an air conditioner according to the present invention will be described in detail with reference to the drawings. The present invention determines whether the thermistor comes off or comes off from a temperature-sensing cylinder attached to the discharge pipe of the compressor by brazing or the like by comparing the discharge temperature T of the discharge pipe with the condensation temperature Tc of the heat exchanger. It was done. Then, when it is determined that the thermistor is disconnected or detached, the operation of the air conditioner is stopped by the detection signal, and a display indicating that there is an abnormality is displayed. As another method,
Actions such as switching to open control without using a thermistor are performed.
【００１１】次に図１のフロー図により動作を説明す
る。まずエアコンの電源スイッチをオンするとし、電動
弁を所定の初期開度にセットする（ステップＳ１）。次
に圧縮機の運転を開始し（ステップＳ２）、圧縮機の運
転後、ｔ１分経過した場合には（ステップＳ３）、サー
ミスタＴＨによる吐出配管の吐出温度Ｔと熱交換器の凝
縮温度Ｔｃとを比較する（ステップＳ４）。Next, the operation will be described with reference to the flow chart of FIG. First, the power switch of the air conditioner is turned on, and the motor-operated valve is set to a predetermined initial opening (step S1). Next, the operation of the compressor is started (step S2), and when t 1 minutes elapses after the operation of the compressor (step S3), the discharge temperature T of the discharge pipe by the thermistor TH and the condensation temperature Tc of the heat exchanger. And are compared (step S4).
【００１２】ここでサーミスタが感温筒から外れずに吐
出温度Ｔを正常に検出動作していれば、吐出温度Ｔ＞凝
縮温度Ｔｃであるため、サーミスタの外れはなしと判定
し（ステップＳ５）、フィードバック制御へ移行する
（ステップＳ６）。If the thermistor does not come off from the temperature sensing cylinder and normally operates to detect the discharge temperature T, it is judged that the thermistor has not come off because the discharge temperature T> the condensation temperature Tc (step S5). The control shifts to the feedback control (step S6).
【００１３】しかしサーミスタの抜けや外れが発生して
いれば、判定結果は吐出温度Ｔ＜凝縮温度Ｔｃとなるの
で、これによりサーミスタが外れている判断して（ステ
ップＳ７）、異常信号を出力し、エアコンの作動を停止
させるか、或いはエアコンの制御をオープン制御に変更
する（ステップＳ８）。このオープン制御としては、例
えば圧縮機のインバータの周波数と外気温度による電動
弁の開度指令を行う制御方式がある。なお上記ステップ
Ｓ４が、異常検出手段２を構成している。However, if the thermistor is detached or detached, the determination result is discharge temperature T <condensing temperature Tc. Therefore, it is determined that the thermistor is detached (step S7), and an abnormal signal is output. The operation of the air conditioner is stopped or the control of the air conditioner is changed to the open control (step S8). As this open control, for example, there is a control method that issues a command to open the motor-operated valve based on the frequency of the compressor inverter and the outside air temperature. The step S4 constitutes the abnormality detecting means 2.
【００１４】[0014]
【発明の効果】上記のようにこの発明のエアコンの異常
検出装置は、圧縮機からの吐出温度をサーミスタにて検
出するエアコンにおいて、上記サーミスタによる検出温
度と凝縮器での凝縮温度とを比較すると共に、検出温度
が凝縮温度よりも低い場合に異常信号を出力する異常検
出手段を設けたものであるから、サーミスタが吐出配管
から外れた場合には、その出力信号によりエアコンを停
止し、異常であることを表示したり、またサーミスタを
用いないですむオープン制御に切り替える等の処置が可
能となり、エアコンの信頼性が向上するという効果を奏
するものである。As described above, the abnormality detecting device for an air conditioner according to the present invention compares the temperature detected by the thermistor with the condensation temperature in the condenser in an air conditioner in which the discharge temperature from the compressor is detected by the thermistor. Along with this, an anomaly detector is provided that outputs an anomaly signal when the detected temperature is lower than the condensation temperature.If the thermistor is disconnected from the discharge pipe, the output signal will stop the air conditioner and It is possible to display a certain thing, and to take measures such as switching to open control without using a thermistor, which has the effect of improving the reliability of the air conditioner.
【図１】この発明の実施例のサーミスタの外れの検出動
作を示すフロー図である。FIG. 1 is a flowchart showing an operation of detecting detachment of a thermistor according to an embodiment of the present invention.
【図２】サーミスタの電圧信号を読み込む場合の要部回
路図である。FIG. 2 is a circuit diagram of a main part when a voltage signal of a thermistor is read.
２ 異常検出手段 ＴＨ サーミスタ Ｔｃ 凝縮温度 2 Anomaly detection means TH Thermistor Tc Condensing temperature
Claims (1)
Ｈ）にて検出するエアコンにおいて、上記サーミスタ
（ＴＨ）による検出温度（Ｔ）と凝縮器での凝縮温度
（Ｔｃ）とを比較すると共に、検出温度（Ｔ）が凝縮温
度（Ｔｃ）よりも低い場合に異常信号を出力する異常検
出手段（２）を設けたことを特徴とするエアコンの異常
検出装置。1. The discharge temperature from the compressor is controlled by the thermistor (T
In the air conditioner that detects H), the temperature (T) detected by the thermistor (TH) is compared with the condensation temperature (Tc) in the condenser, and the detected temperature (T) is lower than the condensation temperature (Tc). An abnormality detecting device for an air conditioner, which is provided with abnormality detecting means (2) for outputting an abnormality signal in some cases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4086697A JP2890970B2 (en) | 1992-02-24 | 1992-02-24 | Air conditioner abnormality detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4086697A JP2890970B2 (en) | 1992-02-24 | 1992-02-24 | Air conditioner abnormality detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05231754A true JPH05231754A (en) | 1993-09-07 |
| JP2890970B2 JP2890970B2 (en) | 1999-05-17 |
Family
ID=13894148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4086697A Expired - Lifetime JP2890970B2 (en) | 1992-02-24 | 1992-02-24 | Air conditioner abnormality detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2890970B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0849951A (en) * | 1994-06-28 | 1996-02-20 | Samsung Electronics Co Ltd | Equipment and method of controlling air conditioner |
| US7419192B2 (en) | 2005-07-13 | 2008-09-02 | Carrier Corporation | Braze-free connector utilizing a sealant coated ferrule |
| US7472557B2 (en) | 2004-12-27 | 2009-01-06 | Carrier Corporation | Automatic refrigerant charging apparatus |
| US7552596B2 (en) | 2004-12-27 | 2009-06-30 | Carrier Corporation | Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication |
| US7610765B2 (en) | 2004-12-27 | 2009-11-03 | Carrier Corporation | Refrigerant charge status indication method and device |
| US7712319B2 (en) | 2004-12-27 | 2010-05-11 | Carrier Corporation | Refrigerant charge adequacy gauge |
| US9759465B2 (en) | 2011-12-27 | 2017-09-12 | Carrier Corporation | Air conditioner self-charging and charge monitoring system |
| CN110500711A (en) * | 2019-08-13 | 2019-11-26 | 珠海格力电器股份有限公司 | The control method of protected by temperature limitation, apparatus and system |
| JPWO2021234854A1 (en) * | 2020-05-20 | 2021-11-25 | ||
| WO2022249502A1 (en) * | 2021-05-24 | 2022-12-01 | 三菱電機株式会社 | Refrigeration and air-conditioning device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02144735U (en) * | 1989-05-08 | 1990-12-07 | ||
| JPH031061A (en) * | 1989-05-25 | 1991-01-07 | Mitsubishi Electric Corp | Controller for air conditioner |
-
1992
- 1992-02-24 JP JP4086697A patent/JP2890970B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02144735U (en) * | 1989-05-08 | 1990-12-07 | ||
| JPH031061A (en) * | 1989-05-25 | 1991-01-07 | Mitsubishi Electric Corp | Controller for air conditioner |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0849951A (en) * | 1994-06-28 | 1996-02-20 | Samsung Electronics Co Ltd | Equipment and method of controlling air conditioner |
| US7472557B2 (en) | 2004-12-27 | 2009-01-06 | Carrier Corporation | Automatic refrigerant charging apparatus |
| US7552596B2 (en) | 2004-12-27 | 2009-06-30 | Carrier Corporation | Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication |
| US7610765B2 (en) | 2004-12-27 | 2009-11-03 | Carrier Corporation | Refrigerant charge status indication method and device |
| US7712319B2 (en) | 2004-12-27 | 2010-05-11 | Carrier Corporation | Refrigerant charge adequacy gauge |
| US7419192B2 (en) | 2005-07-13 | 2008-09-02 | Carrier Corporation | Braze-free connector utilizing a sealant coated ferrule |
| US9759465B2 (en) | 2011-12-27 | 2017-09-12 | Carrier Corporation | Air conditioner self-charging and charge monitoring system |
| CN110500711A (en) * | 2019-08-13 | 2019-11-26 | 珠海格力电器股份有限公司 | The control method of protected by temperature limitation, apparatus and system |
| CN110500711B (en) * | 2019-08-13 | 2023-09-08 | 珠海格力电器股份有限公司 | Temperature limiting protection control method, device and system |
| JPWO2021234854A1 (en) * | 2020-05-20 | 2021-11-25 | ||
| WO2021234854A1 (en) * | 2020-05-20 | 2021-11-25 | 三菱電機株式会社 | Refrigeration cycle device |
| WO2022249502A1 (en) * | 2021-05-24 | 2022-12-01 | 三菱電機株式会社 | Refrigeration and air-conditioning device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2890970B2 (en) | 1999-05-17 |
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