JP2890970B2 - Air conditioner abnormality detection device - Google Patents

Air conditioner abnormality detection device

Info

Publication number
JP2890970B2
JP2890970B2 JP4086697A JP8669792A JP2890970B2 JP 2890970 B2 JP2890970 B2 JP 2890970B2 JP 4086697 A JP4086697 A JP 4086697A JP 8669792 A JP8669792 A JP 8669792A JP 2890970 B2 JP2890970 B2 JP 2890970B2
Authority
JP
Japan
Prior art keywords
thermistor
air conditioner
temperature
compressor
abnormality detection
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 - Lifetime
Application number
JP4086697A
Other languages
Japanese (ja)
Other versions
JPH05231754A (en
Inventor
裕二 米田
浩司 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daikin Kogyo Co Ltd filed Critical Daikin Kogyo Co Ltd
Priority to JP4086697A priority Critical patent/JP2890970B2/en
Publication of JPH05231754A publication Critical patent/JPH05231754A/en
Application granted granted Critical
Publication of JP2890970B2 publication Critical patent/JP2890970B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Air Conditioning Control Device (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【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 air conditioner abnormality detection device suitable for use in controlling 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 Japanese Patent Application No. 2-68660 proposes a system in which the discharge temperature from a compressor is controlled by using a motor-operated valve, thereby controlling the degree of superheat indirectly. In the discharge temperature control method of the compressor, the discharge temperature is detected by a thermistor, and the thermistor is inserted and disposed 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。
If the above-mentioned thermistor causes a defect, the system cannot be established. It is considered that there are mainly two types of thermistor failures as follows. That is, the short-circuit or disconnection of the thermistor, and the detachment or detachment of the thermistor from the thermosensitive cylinder.

【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
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。
[0004] The short circuit or disconnection of the thermistor can be detected as follows. That is, as shown in FIG. 2, to connect the thermistor TH in the bias resistor R 1 in series, by connecting the connection point to the A / D port of the microcomputer 1 for controlling the system, the voltage of the analog according 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 0 V, and when the thermistor TH is short-circuited, A / D
Since the power supply voltage V is directly input to the D port, the microcomputer 1 can detect an abnormality (defective) of the thermistor TH itself.

【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
In the event that H comes off or comes off from the temperature-sensitive cylinder, the electric valve is controlled by detecting the temperature of the thermistor TH. Therefore, the resistance value of the thermistor TH becomes lower than it actually is, and the electric valve is closed. → 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。
Therefore, as a countermeasure against disconnection or detachment from the temperature-sensitive cylinder provided in the discharge pipe of the thermistor TH, the thermistor T
It is conceivable to caulk and fix H. In this case, since the thermistor TH is attached to the thermosensitive cylinder by caulking, 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。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide an air conditioner abnormality detecting device capable of improving the reliability of an 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、圧縮機の吐出配管にサーミスタT
Hを付設し、このサーミスタTHで圧縮機からの吐出温
度を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、
サーミスタTHが吐出配管から熱的に外れているとし
て、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。
SUMMARY OF THE INVENTION Therefore, an air conditioner abnormality detecting apparatus according to the present invention includes a thermistor T in a discharge pipe of a compressor.
In the air conditioner provided with H and detecting the discharge temperature from the compressor with the thermistor TH, the temperature T detected by the thermistor TH and the condensation temperature Tc in the condenser are compared, and the detected temperature T is set to Is also low,
Assume that thermistor TH is thermally disconnected from discharge pipe
Thus, an abnormality detection means 2 for outputting an abnormality signal is provided.

【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 air conditioner abnormality detecting device, when the thermistor TH comes off the discharge pipe, the detected temperature T
Does not rise up to the condensation temperature Tc, so that an abnormal signal is output. Therefore, it is possible to take measures such as stopping the air conditioner based on the output signal, displaying that the air conditioner is abnormal, and switching to open control that does not require 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 Next, a specific embodiment of an air conditioner abnormality detecting apparatus according to the present invention will be described in detail with reference to the drawings. The present invention determines whether or not the thermistor comes off or comes off from a temperature sensing tube attached to the discharge pipe of a compressor by brazing or the like by comparing the discharge temperature T of the discharge pipe with the condensing temperature Tc of the heat exchanger. It is something to do. If it is determined that the thermistor is disconnected or disconnected, the operation of the air conditioner is stopped based on the detection signal, and a display indicating that the air conditioner is abnormal is displayed. Alternatively,
A measure such as switching to open control which does not require a thermistor is 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処理がス
タートし、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S
2)、圧縮機の運転後、t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S
4)。
Next, the operation will be described with reference to the flowchart of FIG. First, turn on the power switch of the air conditioner .
Then , the electric valve is set to a predetermined initial opening (step S1). Next, the operation of the compressor is started (step S
2) after the operation of the compressor, when it is passed t 1 minute compared with (step S3), and the condensation temperature Tc of the discharge temperature T and the heat exchanger of the discharge pipe by the thermistor TH (step S
4).

【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 temperature of the thermistor does not deviate from the temperature-sensitive cylinder and the discharge temperature T is normally detected, the discharge temperature T> condensation temperature Tc. The process proceeds to 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 has come off or comes off, the result of determination is that the discharge temperature T <condensation temperature Tc. Therefore, it is determined that the thermistor has come off (step S7), and an abnormal signal is output. Then, the operation of the air conditioner is stopped, or the control of the air conditioner is changed to open control (step S8). As this open control, for example, there is a control method in which an opening degree command of a motor-operated valve is issued based on the frequency of an inverter of a compressor and the outside air temperature. 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。また、圧縮機からの吐出温度を予めメ
モリ等に記憶させた基準値と比較する異常判定方式に比
べて、メモリ等が不要であるため構成が簡素化できると
共に、基準値の設定作業が不要になるという利点があ
る。さらに、吐出温度と凝縮温度とは、正常であれば常
に所定の大小関係を維持したまま変動するので、大小関
係が逆転したことにより正確かつ早期に異常を検出する
ことができる。
As described above, the air conditioner abnormality detecting apparatus according to the present invention compares the temperature detected by the thermistor with the condensation temperature in the condenser in the air conditioner in which the discharge temperature from the compressor is detected by the thermistor. At the same time, when the detected temperature is lower than the condensing temperature, the abnormality detecting means for outputting an abnormal signal is provided.If the thermistor comes off the discharge pipe, the air conditioner is stopped by the output signal, and This makes it possible to display a message indicating that the air conditioner is open or to switch to open control without using a thermistor, thereby improving the reliability of the air conditioner. In addition, the discharge temperature from the compressor is stored in advance.
Compared with the abnormality judgment method that compares with the reference value stored in
In all cases, since the memory and the like are unnecessary, the configuration can be simplified.
Both have the advantage that the work of setting the reference value is not required.
You. Furthermore, if the discharge temperature and the condensation temperature are normal,
Fluctuates while maintaining the predetermined magnitude relationship.
Detect abnormalities accurately and early due to reversal of engagement
be able to.

【図面の簡単な説明】[Brief description of the drawings]

【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 a thermistor detachment 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 main part circuit diagram when a voltage signal of a thermistor is read.

【符号の説明】 2 異常検出手段 TH サーミスタ Tc 凝縮温度[Explanation of Signs] 2 Abnormality detecting means TH Thermistor Tc Condensation temperature

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) F25B 49/02 570 F24F 11/02 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) F25B 49/02 570 F24F 11/02

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 圧縮機の吐出配管にサーミスタ(TH)
を付設し、このサーミスタ(TH)で圧縮機からの吐出
温度を検出するエアコンにおいて、上記サーミスタ(T
H)による検出温度(T)と凝縮器での凝縮温度(T
c)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、サーミスタ(TH)が吐出
配管から熱的に外れているとして、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. A thermistor (TH) in a discharge pipe of a compressor.
In an air conditioner that detects the discharge temperature from the compressor with the thermistor (TH), the thermistor (T
H) and the condensation temperature in the condenser (T)
c), and when the detected temperature (T) is lower than the condensation temperature (Tc), the thermistor (TH) discharges.
An abnormality detection device for an air conditioner, comprising: abnormality detection means (2) for outputting an abnormality signal on the assumption that it is thermally disconnected from the pipe .
JP4086697A 1992-02-24 1992-02-24 Air conditioner abnormality detection device Expired - Lifetime JP2890970B2 (en)

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 JPH05231754A (en) 1993-09-07
JP2890970B2 true 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)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960001662A (en) * 1994-06-28 1996-01-25 김광호 Air conditioner control device and method
US7712319B2 (en) 2004-12-27 2010-05-11 Carrier Corporation Refrigerant charge adequacy gauge
US7610765B2 (en) 2004-12-27 2009-11-03 Carrier Corporation Refrigerant charge status indication method and device
US7552596B2 (en) 2004-12-27 2009-06-30 Carrier Corporation Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication
US7472557B2 (en) 2004-12-27 2009-01-06 Carrier Corporation Automatic refrigerant charging apparatus
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
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
WO2021234854A1 (en) * 2020-05-20 2021-11-25 三菱電機株式会社 Refrigeration cycle device
JP2022179969A (en) * 2021-05-24 2022-12-06 三菱電機株式会社 Refrigerating air conditioner

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0645786Y2 (en) * 1989-05-08 1994-11-24 ダイキン工業株式会社 Thermistor false detection diagnostic device
JP2508268B2 (en) * 1989-05-25 1996-06-19 三菱電機株式会社 Control device for air conditioner

Also Published As

Publication number Publication date
JPH05231754A (en) 1993-09-07

Similar Documents

Publication Publication Date Title
JP2890970B2 (en) Air conditioner abnormality detection device
JP2000274773A (en) Method for controlling air conditioner
JPH10238912A (en) Air conditioner and multizone air conditioner
JPH07234044A (en) Controlling device for protecting compressor of air conditioner
JPH10197031A (en) Trouble detector for air conditioner
KR20000073043A (en) Fan trouble sensing method for air conditioner
JPH11316043A (en) Abnormality detector for air conditioner
KR20010048700A (en) malfunction detector of refrigerant cycle for air conditioner
JPH05332647A (en) Air conditioner
KR100362374B1 (en) Method for indicating refrigerant leakage of refrigerating cycle
JPS5875649A (en) Abnormality detecting device of air conditioner
JP2000018778A (en) Abnormality detector for air conditioner
JPH1026429A (en) Air conditioner
KR20010028950A (en) thermal sensor error judgement method of air-conditioner
JP3594358B2 (en) Air conditioner
JPH05126443A (en) Controller of refrigerator
KR19990012526A (en) Air Conditioning Equipment and Control Method
JPH031061A (en) Controller for air conditioner
JPH0544981A (en) Detecting method for abnormality of outdoor fan motor for air conditioner
JPH0719679A (en) Air conditioner
JPH06221645A (en) Air conditioner
JPH03175244A (en) Refrigerating machine
JPH05223360A (en) Air conditioner
JPH05296524A (en) Air conditioner
JPH085129A (en) Air-conditioning device and its motor abnormality-detecting method

Legal Events

Date Code Title Description
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080226

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090226

Year of fee payment: 10

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090226

Year of fee payment: 10

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100226

Year of fee payment: 11

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110226

Year of fee payment: 12

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110226

Year of fee payment: 12

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120226

Year of fee payment: 13

EXPY Cancellation because of completion of term