JPH08303924A

JPH08303924A - Defrosting control device for refrigerator

Info

Publication number: JPH08303924A
Application number: JP11434995A
Authority: JP
Inventors: Kosaku Adachi; 幸作足立; Yasuzo Ishine; 靖三石根; Minoru Tenmyo; 稔天明; Hiroko Hongo; 裕子本郷; Atsushi Kusunoki; 敦楠; Keimei Asakura; 啓明朝倉
Original assignee: Toshiba Corp; Toshiba AVE Co Ltd
Current assignee: Toshiba Corp; Toshiba AVE Co Ltd
Priority date: 1995-05-12
Filing date: 1995-05-12
Publication date: 1996-11-22

Abstract

PURPOSE: To save power by a method wherein a forced defrosting is surely started at the time of an abnormal frosting condition, and a defrosting cycle under a normal using state wherein the frequency of the opening/closing of a door is less is set longer than a conventional cycle. CONSTITUTION: Both detected temperatures of a temperature detecting means 11 in a condenser and defrosting return temperature detecting means 12 are input after a specified period of time has passed from the start of cooling of a refrigerator chamber/vegetable chamber until the completion of the cooling. When a temperature difference of both detected temperatures becomes a specified set value, the integration of a compressor operation time for the setting of a defrosting cycle under a normal usage is reset, and a defrosting is forcibly started by a forcible defrosting starting means 16 being provided in a refrigerator.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、冷蔵庫の除霜制御装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrost control device for a refrigerator.

【０００２】[0002]

【従来の技術】従来の冷蔵庫の除霜制御装置としては、
例えば冷却器の前回の除霜が終了した時点から所定時間
以上になった時、又はこの終了した時点からコンプレッ
サの運転積算時間が所定時間以上になった時、再び除霜
を行うようにした方法がある。この除霜制御方法では、
除霜周期は固定であり、そのため、除霜を行わない時
間、即ち冷却時間の時間設定は冷却性能の保持及び残氷
発生抑制のために、例えば庫内に水分蒸発量の多い食品
を大量に収納した場合等、通常より過酷な条件を想定し
て設定していた。2. Description of the Related Art As a conventional defrosting control device for a refrigerator,
For example, a method in which defrosting is performed again when a predetermined time or more has passed from the time when the previous defrosting of the cooler ended, or when the accumulated operating time of the compressor reached a predetermined time or more from this time There is. With this defrost control method,
The defrosting cycle is fixed, so the time when defrosting is not performed, that is, the time setting of the cooling time, in order to maintain the cooling performance and suppress the generation of residual ice, for example, a large amount of food with a large amount of water evaporation is stored in the refrigerator. It was set assuming severer conditions than usual, such as when stored.

【０００３】[0003]

【発明が解決しようとする課題】従来は、除霜周期を、
例えば庫内に水分蒸発量の多い食品を大量に収納した場
合等、通常より過酷な条件を想定して設定していたた
め、通常の使用状態においては、まだ除霜の必要がない
のに関わらず、除霜が行われてしまい、除霜ヒータの通
電頻度が増して消費電力量が増加するという問題点があ
った。この問題を解決するために、例えば扉の開閉数と
外気温度・湿度等を検知して除霜開始時期を延長する方
法等が考えられている（特願平６−５３７９６号等）。
しかし、この方法は、外気湿度の浸入による着霜量を推
定するものであり、庫内食品からの水分蒸発量までは推
定できないため、延長時間を決定する場合、庫内食品か
らの水分蒸発量を十分に見込んで設定しなければなら
ず、大きな省電力効果を得られなかった。除霜周期を最
適化する場合、庫内に水分蒸発量の多い食品を入れられ
た場合及び半扉状態等における異常着霜をいかに精度よ
く検知できるかが、大きな問題となっていた。Conventionally, a defrost cycle is
For example, when a large amount of food with a large amount of water evaporation was stored in the refrigerator, it was set assuming more severe conditions than usual, so under normal use conditions, there is no need for defrosting. However, there is a problem in that defrosting is performed, the energization frequency of the defrosting heater increases, and the power consumption increases. In order to solve this problem, for example, a method of detecting the number of open / closed doors and the outside air temperature / humidity to extend the defrosting start time has been considered (Japanese Patent Application No. 6-53796).
However, this method estimates the amount of frost formed by the ingress of outside air humidity, and cannot estimate the amount of water evaporation from the food in the refrigerator, so when determining the extension time, the amount of water evaporation from the food in the oven Has to be set in full consideration, and a large power saving effect has not been obtained. When optimizing the defrosting cycle, how to accurately detect abnormal frost formation when a food with a large amount of water evaporation is put in the refrigerator and in a half-door state has been a serious problem.

【０００４】本発明は、上記に鑑みてなされたもので、
庫内に水分蒸発量の多い食品が入れられた場合や半扉状
態等、通常使用時では発生頻度の少ない異常着霜条件時
に、過着霜となる前に強制除霜を確実に開始させること
ができ、扉開閉頻度の少ない通常使用状態における除霜
周期等を長く設定できて省電力を図ることができ、また
センサ等の異常時でも、通常使用時の正常運転を継続さ
せることができる冷蔵庫の除霜制御装置を提供すること
を目的とする。The present invention has been made in view of the above,
To ensure that forced defrosting is started before excessive frosting occurs under abnormal frosting conditions that occur less frequently during normal use, such as when food with a large amount of water evaporation is put in the refrigerator or in a half-door state. Refrigerator that can be used to save power by setting a long defrost cycle etc. in a normal use state where the frequency of opening and closing the door is low, and can continue normal operation during normal use even when there is an abnormality in the sensor etc. An object of the present invention is to provide a defrost control device.

【０００５】[0005]

【課題を解決するための手段】上記課題を解決するため
に、請求項１記載の発明は、圧縮機の運転時間を積算
し、該運転時間が一定値に達した時、除霜を開始する冷
蔵庫の除霜制御装置において、冷却器内における冷蔵室
・野菜室からのリターン空気の流路上に設置され該リタ
ーン空気の温度を検知する冷却器内空気温度検知手段
と、前記冷却器自体の温度を検知する除霜復帰温度検知
手段と、前記冷蔵室・野菜室の冷却開始時から一定時間
を計測するタイマ手段と、該タイマ手段で計測された一
定時間の経過後から前記冷蔵室・野菜室の冷却終了まで
の間前記冷却器内空気温度検知手段及び除霜復帰温度検
知手段の両検知温度を入力し該両検知温度の温度差が所
定の設定値に到達した時には前記積算中の運転時間をリ
セットして強制的に除霜を開始させる強制除霜開始手段
とを有することを要旨とする。In order to solve the above-mentioned problems, the invention according to claim 1 integrates the operating time of the compressor, and when the operating time reaches a constant value, defrosting is started. In a defrosting control device for a refrigerator, an air temperature detecting means in a cooler, which is installed on a flow path of return air from a refrigerating room / vegetable room in the cooler and detects a temperature of the return air, and a temperature of the cooler itself. Defrosting recovery temperature detection means, a timer means for measuring a fixed time from the start of cooling of the refrigerating / vegetable compartment, and the refrigerating / vegetable compartment after the elapse of the fixed time measured by the timer means. During the period until the end of cooling, the both detection temperatures of the air temperature detection means in the cooler and the defrost recovery temperature detection means are input, and when the temperature difference between the detection temperatures reaches a predetermined set value, the operating time during the integration Reset to force removal And summarized in that and a forced defrosting start means for starting.

【０００６】請求項２記載の発明は、上記請求項１記載
の冷蔵庫の除霜制御装置において、前記冷蔵室・野菜室
の冷却時に冷蔵庫の扉が開いたときは、前記強制除霜開
始手段は、前記扉が開いた時点から該扉が閉まった後、
前記タイマ手段で一定時間が再計測されるまでの間は前
記両検知温度の温度差に基づく除霜開始の判断を中止す
るように構成してなることを要旨とする。According to a second aspect of the present invention, in the defrost control device for a refrigerator according to the first aspect, when the refrigerator door is opened during cooling of the refrigerating compartment / vegetable compartment, the forced defrost starting means is , After the door has been closed since the door was opened,
The gist is that the determination of defrosting start based on the temperature difference between the both detected temperatures is stopped until the predetermined time is re-measured by the timer means.

【０００７】請求項３記載の発明は、圧縮機の運転時間
を積算し、該運転時間が一定値に達した時、除霜を開始
する冷蔵庫の除霜制御装置において、冷却器内における
冷蔵室・野菜室からのリターン空気の流路上に設置され
該リターン空気の温度を検知する冷却器内空気温度検知
手段と、前記冷却器自体の温度を検知する除霜復帰温度
検知手段と、前記冷蔵室・野菜室の冷却開始時から冷却
終了までの間前記冷却器内空気温度検知手段及び除霜復
帰温度検知手段の両検知温度を入力し該両検知温度のう
ちの少なくとも何れか一方の検知温度の変化率が所定の
設定変化率以下の区間において前記両検知温度の温度差
が所定の設定値に到達した時には前記積算された運転時
間をリセットして強制的に除霜を開始させる強制除霜開
始手段とを有することを要旨とする。According to a third aspect of the present invention, in the defrost control device for a refrigerator, which integrates the operating time of the compressor and starts defrosting when the operating time reaches a certain value, a refrigerating room in the cooler. A cooler inside air temperature detecting means installed on the flow path of return air from the vegetable compartment to detect the temperature of the return air, a defrost return temperature detecting means to detect the temperature of the cooler itself, and the refrigerating room From the start of cooling the vegetable compartment to the end of cooling, input both detection temperatures of the air temperature detection means in the cooler and the defrost return temperature detection means, and detect at least one of the detection temperatures. When the temperature difference between the two detected temperatures reaches a predetermined set value in a section where the change rate is less than or equal to a predetermined set change rate, the integrated operating time is reset to forcibly start defrosting. With means The gist of the door.

【０００８】請求項４記載の発明は、圧縮機の運転時間
を積算する積算時間計測手段と、該積算時間計測手段で
積算された圧縮機の運転時間が一定値に達した後、当該
運転時間の積算中における冷蔵庫の扉の開閉数と外気温
度を基に除霜開始猶予時間を設定し、この除霜開始猶予
時間の経過後に除霜を開始させる除霜猶予判断手段とを
有する冷蔵庫の除霜制御装置において、冷却器内におけ
る冷蔵室・野菜室からのリターン空気の流路上に設置さ
れ該リターン空気の温度を検知する冷却器内空気温度検
知手段と、前記冷却器自体の温度を検知する除霜復帰温
度検知手段と、前記冷蔵室・野菜室の冷却開始時から一
定時間を計測するタイマ手段と、該タイマ手段で計測さ
れた一定時間の経過後から前記冷蔵室・野菜室の冷却終
了までの間前記冷却器内空気温度検知手段及び除霜復帰
温度検知手段の両検知温度を入力し該両検知温度の温度
差が所定の設定値に到達した時には前記積算時間計測手
段で積算中の運転時間をリセットして強制的に除霜を開
始させる強制除霜開始手段とを有することを要旨とす
る。According to a fourth aspect of the present invention, an integrated time measuring means for integrating the operating time of the compressor, and the operating time of the compressor after the operating time of the compressor integrated by the integrated time measuring means reaches a constant value. The defrosting delay judgment means for setting the defrosting start grace time based on the number of open / closed doors of the refrigerator and the outside air temperature during the integration of, and defrosting grace judgment means for starting defrosting after the defrost start grace time has elapsed. In the frost control device, a cooler air temperature detecting means for detecting the temperature of the return air, which is installed on the flow path of the return air from the refrigerating room / vegetable room in the cooler, and the temperature of the cooler itself are detected. Defrost recovery temperature detecting means, timer means for measuring a fixed time from the start of cooling of the refrigerating / vegetable compartment, and completion of cooling of the refrigerating / vegetable compartment after elapse of the fixed time measured by the timer means. Until the cold When both the detection temperatures of the internal air temperature detection means and the defrost recovery temperature detection means are input, and the temperature difference between the detection temperatures reaches a predetermined set value, the operating time during integration is reset by the integration time measurement means. And a forced defrost starting means for forcibly starting defrosting.

【０００９】請求項５記載の発明は、上記請求項４記載
の冷蔵庫の除霜制御装置において、除霜中に除霜時間を
計測し、該除霜時間が所定の設定時間を超えたときは、
次回からは前記除霜猶予判断手段による除霜開始猶予時
間の設定を中止して前記積算時間計測手段で積算された
圧縮機の運転時間が一定値に達した時に除霜を開始させ
るように構成してなることを要旨とする。According to a fifth aspect of the present invention, in the defrosting control device for a refrigerator according to the fourth aspect, the defrosting time is measured during defrosting, and when the defrosting time exceeds a predetermined set time. ,
From the next time, the setting of the defrost start grace time by the defrost grace judging means is stopped and the defrosting is started when the operating time of the compressor accumulated by the accumulated time measuring means reaches a certain value. What is done is the gist.

【００１０】請求項６記載の発明は、上記請求項１，
２，３又は４記載の冷蔵庫の除霜制御装置において、前
記冷却器内空気温度検知手段又は除霜復帰温度検知手段
の少なくとも何れかの異常を検出したときは、次回から
は前記強制除霜開始手段による強制除霜の開始を中止さ
せるように構成してなることを要旨とする。The invention according to claim 6 is the above-mentioned claim 1,
In the defrosting control device for a refrigerator according to 2, 3, or 4, when at least one of the cooler inside air temperature detecting means and the defrosting returning temperature detecting means is detected to be abnormal, the forced defrosting starts from the next time. The gist is that it is configured to stop the start of forced defrosting by means.

【００１１】[0011]

【作用】請求項１記載の発明において、冷蔵室・野菜室
冷却時の安定状態における冷却器内空気温度検知手段及
び除霜復帰温度検知手段の両検知温度の相対差により強
制除霜開始時期が決定される。このため、例えば外気温
度低下により冷却器蒸発温度が低下し、その影響で冷却
器内空気温度が低下した場合でも冷却器自体の温度低下
により除霜復帰温度検知手段の検知温度も同様に低下す
るので相対差としては外気温度の影響を受けない。また
冷蔵室・野菜室が半扉状態で冷却器温度が上昇しても冷
却器内空気温度も同様に上昇する。つまり外気温度変化
及び半扉状態においても確実に強制除霜開始時期を決定
することが可能となる。したがって冷蔵室・野菜室に水
分蒸発量の多い食品が入れられた場合や半扉状態等の通
常使用時では発生頻度の少ない異常着霜条件時に、過着
霜となる前に強制除霜を確実に開始させることができ
る。この結果、扉開閉頻度の少ない通常使用状態におけ
る圧縮機の運転時間を基にした除霜周期を従来より長く
設定することができて省電力を図ることが可能となる。According to the first aspect of the invention, the forced defrosting start timing is determined by the relative difference between the temperatures detected by the cooler air temperature detecting means and the defrosting recovery temperature detecting means in a stable state during cooling of the refrigerating room / vegetable room. It is determined. Therefore, for example, when the cooler evaporation temperature decreases due to a decrease in the outside air temperature, and even if the air temperature inside the cooler decreases due to the effect, the detection temperature of the defrost return temperature detecting means also decreases due to the decrease in the temperature of the cooler itself. Therefore, the relative difference is not affected by the outside air temperature. Moreover, even if the cooler temperature rises when the refrigerator / vegetable compartment is in a half-door state, the air temperature inside the cooler also rises. That is, the forced defrosting start time can be reliably determined even when the outside air temperature changes and the half-door state. Therefore, when abnormal food conditions such as food containing a large amount of water vapor are put in the refrigerator / vegetable room or when the door is normally used, such as in the half-door state, forced defrosting is ensured before overfrosting occurs. Can be started. As a result, it is possible to set the defrost cycle based on the operating time of the compressor in the normal use state in which the door opening / closing frequency is low, to be longer than in the conventional case, and it is possible to save power.

【００１２】請求項２記載の発明において、冷蔵室・野
菜室の冷却時に扉が開くと冷蔵室・野菜室からのリター
ン空気の流れが止まるため、冷却器内空気温度検知手段
の検知温度は冷却器温度に近づいて低下していく。この
ため、扉の開閉時及び扉が閉まってから直ぐに温度検知
を行うと、この温度検知に基づく強制除霜開始時期の決
定を誤判断するおそれがある。このため、冷蔵室・野菜
室の冷却時に扉が開いたときは、扉が開いた時点から扉
が閉まった後の一定時間までの間、強制除霜開始の判断
を中止することにより、誤判断を防止することが可能と
なる。According to the second aspect of the present invention, if the door is opened during cooling of the refrigerator compartment / vegetable compartment, the flow of return air from the refrigerator compartment / vegetable compartment stops, so the temperature detected by the air temperature detecting means in the cooler is cooled. It approaches the temperature of the vessel and decreases. Therefore, if the temperature is detected when the door is opened / closed and immediately after the door is closed, there is a possibility that the determination of the forced defrost start time based on the temperature detection may be erroneously made. For this reason, if the door is opened during cooling of the refrigerator / vegetable compartment, the judgment of forced defrosting is stopped for a certain period of time after the door is opened until the door is closed. Can be prevented.

【００１３】請求項３記載の発明において、冷蔵室・野
菜室の冷却開始時から一定時間の経過後は、リターン空
気の温度及び冷却器温度は安定状態となる。このため、
冷却器内空気温度検知手段及び除霜復帰温度検知手段の
両検知温度のうちの少なくとも何れか一方の検知温度の
変化率が所定の設定変化率以下の区間における両検知温
度の温度差を用いても、確実に強制除霜開始時期を決定
することが可能となる。In the third aspect of the invention, the temperature of the return air and the cooler temperature become stable after a lapse of a certain time from the start of cooling the refrigerating compartment / vegetable compartment. For this reason,
Using the temperature difference between the detected temperature of at least one of the detected temperatures of the cooler air temperature detection means and the defrost return temperature detection means in a section where the rate of change is less than or equal to a predetermined set change rate. Also, the forced defrost start time can be reliably determined.

【００１４】請求項４記載の発明において、強制除霜開
始手段により、通常使用時では発生頻度の少ない異常着
霜条件時に、過着霜となる前に強制除霜を確実に開始さ
せることができるので、除霜猶予判断手段は異常使用状
態を考慮することなく通常使用時の扉開閉数と外気温度
を基に除霜開始猶予時間を設定すればよく、除霜開始猶
予時間を従来より長く設定することができて省電力を図
ることが可能となる。In the invention according to claim 4, the forced defrosting means can surely start the forced defrosting before the excessive frosting occurs under the abnormal frosting condition that the occurrence frequency is low in the normal use. Therefore, the defrost grace judgment means can set the defrost start grace time based on the number of open / closed doors and the outside air temperature during normal use without considering the abnormal use state, and set the defrost start grace time longer than before. Therefore, it is possible to save power.

【００１５】請求項５記載の発明において、除霜時間が
所定の設定時間を超えたときは、システムの異常（検知
手段の特性変動等）と判断される。このとき、次回から
は、除霜猶予判断手段による除霜開始猶予時間の設定を
中止して圧縮機の運転時間を基に除霜を開始させること
により、システム異常時でも正常運転に近い状態を継続
させることが可能となる。In the fifth aspect of the invention, when the defrosting time exceeds a predetermined set time, it is determined that the system is abnormal (variation in the characteristics of the detecting means). At this time, from the next time, the setting of the defrost start grace time by the defrost grace judging means is stopped and defrosting is started based on the operating time of the compressor, so that a state close to normal operation can be achieved even when the system is abnormal. It is possible to continue.

【００１６】請求項６記載の発明において、冷却器内空
気温度検知手段又は除霜復帰温度検知手段の少なくとも
何れかの異常（オープン或いはショート等）を検出した
ときは、強制除霜開始手段による強制除霜の開始を中止
して圧縮機の運転時間を基に除霜開始等をさせることに
より、温度検知手段の異常時でも、少なくとも通常使用
時での正常運転を継続させることが可能となる。In the invention according to claim 6, when an abnormality (open or short circuit) of at least one of the air temperature detecting means in the cooler and the defrosting recovery temperature detecting means is detected, the forced defrosting starting means forces the forced defrosting to start. By stopping the start of defrosting and starting defrosting based on the operating time of the compressor, it is possible to continue normal operation at least during normal use even when the temperature detecting means is abnormal.

【００１７】[0017]

【実施例】【Example】

第１の実施例図１乃至図６に基づいて第１の実施例を説明する。本実
施例の冷蔵庫の除霜制御装置は、庫内に水分蒸発量を非
常に多い食品が入れられた場合、高温高湿半扉状態の場
合等、通常使用において希に発生する異常着霜条件時
に、強制除霜を行うものである。まず図２、図３を用い
て、冷蔵庫及びその冷却器（エバポレータ）周辺の構成
から説明する。図２に示すように、冷蔵庫はミッドフリ
ーザタイプで大きく分けて４室に仕切られており、上か
ら冷蔵室１、第１冷凍室２ａ、第２冷凍室２ｂ、野菜室
３で構成されている。以下、第１冷凍室２ａ、第２冷凍
室２ｂを含めて冷凍室２と云う。４，５は冷凍サイクル
におけるコンプレッサ（圧縮機）と冷却器（エバポレー
タ）、６は冷却器５で冷やされた冷気を庫内に循環させ
るファン、７は冷蔵室１・野菜室３への冷気の流れを制
御するモータダンパである。庫内冷却はファン６により
庫内に冷気を巡回させ、その流路は、冷蔵室１・野菜室
３と冷凍室２とで別々に構成されて、冷却器５に戻って
くるようになっている。８は冷凍室２内の温度を検知す
る冷凍室温度センサ、９は冷蔵室１内の温度を検知する
冷蔵室温度センサである。冷凍室温度センサ８の検出値
が所定の設定値に達すると冷凍サイクルが働き、ファン
６もこれに連動して回転する。また冷蔵室温度センサ９
の検出値によりモータダンパ７の開閉が制御されるよう
に構成されている。First Embodiment A first embodiment will be described based on FIGS. 1 to 6. The defrosting control device for the refrigerator according to the present embodiment has an abnormal frosting condition that rarely occurs in normal use, such as when a food with a very large amount of water evaporation is put in the refrigerator, in a high temperature and high humidity half-door state, etc. Occasionally, forced defrosting is performed. First, the configuration around the refrigerator and its cooler (evaporator) will be described with reference to FIGS. 2 and 3. As shown in FIG. 2, the refrigerator is a mid-freezer type and is roughly divided into four compartments, and is composed of a refrigerating compartment 1, a first freezing compartment 2a, a second freezing compartment 2b, and a vegetable compartment 3 from the top. . Hereinafter, the first freezing room 2a and the second freezing room 2b are collectively referred to as the freezing room 2. 4, 5 are compressors (compressors) and coolers (evaporators) in the refrigeration cycle, 6 are fans for circulating the cold air cooled by the cooler 5, and 7 is cold air to the refrigerator compartment 1 and the vegetable compartment 3. It is a motor damper that controls the flow. For cooling the inside of the refrigerator, cool air is circulated in the refrigerator by a fan 6, and its flow path is configured separately for the refrigerating compartment 1, the vegetable compartment 3 and the freezing compartment 2 and returns to the cooler 5. There is. Reference numeral 8 is a freezer compartment temperature sensor that detects the temperature inside the freezer compartment 2, and 9 is a refrigerating compartment temperature sensor that detects the temperature inside the refrigerating compartment 1. When the detection value of the freezer compartment temperature sensor 8 reaches a predetermined set value, the refrigeration cycle operates and the fan 6 also rotates in conjunction with this. In addition, the refrigerator temperature sensor 9
The opening / closing of the motor damper 7 is controlled by the detection value of.

【００１８】図３は、冷却器周辺を示している。冷却器
５の中央部に冷蔵室１・野菜室３のリターン空気が流
れ、その左右を冷凍室２のリターン空気が流れるように
構成されており、また、冷蔵室１・野菜室３のリターン
空気の流れる部分のほぼ中央部には、冷却器内空気温度
検知手段としての冷却器内空気温度センサ１１が取り付
けられている。この冷却器内空気温度センサ１１は、セ
ンサ固定具１３により、冷却器５とは熱的に絶縁されて
取り付けられており、冷却器５内を流れる冷蔵室１・野
菜室３からのリターン空気温度を検出するようにしてあ
る。また冷却器５の左上には、冷却器５自体の温度を検
知する除霜復帰温度検知手段としての除霜復帰温度セン
サ１２が取り付けられており、除霜時にはこの除霜復帰
温度センサ１２の検出値が所定の温度になった場合に除
霜ヒータの通電を終了する構成となっている。FIG. 3 shows the periphery of the cooler. Return air from the refrigerator compartment 1 / vegetable compartment 3 flows in the center of the cooler 5, and return air from the freezer compartment 2 flows to the left and right of the refrigerator. An in-cooler air temperature sensor 11 as an in-cooler air temperature detecting means is attached to a substantially central portion of the flowing part of. The air temperature sensor 11 in the cooler is attached to the cooler 5 by a sensor fixture 13 so as to be thermally insulated from the cooler 5, and the temperature of the return air from the refrigerating compartment 1 and the vegetable compartment 3 flowing in the cooler 5. Is detected. Further, a defrost return temperature sensor 12 as a defrost return temperature detecting means for detecting the temperature of the cooler 5 itself is attached to the upper left of the cooler 5, and the defrost return temperature sensor 12 detects when defrosting. When the value reaches a predetermined temperature, energization of the defrost heater is terminated.

【００１９】次いで、図１の除霜制御装置の構成を説明
する。冷凍室温度センサ８と冷蔵室温度センサ９がコン
プ・ダンパ制御部１４に接続されている。コンプ・ダン
パ制御部１４は、冷凍室温度センサ８と冷蔵室温度セン
サ９の各検出値によりコンプレッサ４とモータダンパ７
のＯＮ／ＯＦＦを制御し、コンプレッサ４のＯＮ時間信
号がコンプ積算時間計測手段としてのコンプ積算時間計
測タイマ１５に入力されてコンプレッサ４の運転時間が
計測されるようになっている。冷却器内空気温度センサ
１１と除霜復帰温度センサ１２は強制除霜開始手段とし
ての強制除霜判定部１６に接続されている。また強制除
霜判定部１６にはタイマ手段１７が付設され、コンプ・
ダンパ制御部１４からモータダンパ７のダンパ開閉信号
が入力されている。タイマ手段１７は、モータダンパ７
の開、即ち冷蔵室１・野菜室３の冷却開始時から一定時
間を計測する。強制除霜判定部１６は、この一定時間経
過後から冷蔵室１・野菜室３の冷却終了までの間、冷却
器内空気温度センサ１１及び除霜復帰温度センサ１２の
両検知温度を入力し、この両検知温度の温度差が所定の
設定値に到達した時、強制除霜信号を出力するようにな
っている。また、この強制除霜信号によりコンプ積算時
間計測タイマ１５がリセットされる。そして、コンプ積
算時間計測タイマ１５からの積算タイマ終了信号又は強
制除霜判定部１６からの強制除霜信号がＯＲ回路１８を
経て出力され、コンプ積算時間計測タイマ１５が一定の
値をカウントした場合、或いは強制除霜判定部１６が強
制除霜を判定した場合に除霜が開始される構成となって
いる。Next, the structure of the defrost control device of FIG. 1 will be described. The freezer compartment temperature sensor 8 and the refrigerator compartment temperature sensor 9 are connected to the comp / damper control unit 14. The compressor / damper control unit 14 uses the detection values of the freezer compartment temperature sensor 8 and the refrigerating compartment temperature sensor 9 to determine the compressor 4 and the motor damper 7.
ON / OFF of the compressor 4 is controlled, and the ON time signal of the compressor 4 is input to the compressor integrated time measuring timer 15 as the compressor integrated time measuring means to measure the operating time of the compressor 4. The in-cooler air temperature sensor 11 and the defrost return temperature sensor 12 are connected to a forced defrost determination unit 16 as a forced defrost starting means. Further, a timer means 17 is attached to the forced defrosting determination section 16 to
A damper opening / closing signal of the motor damper 7 is input from the damper control unit 14. The timer means 17 is a motor damper 7.
Is measured, that is, a certain period of time is measured from the start of cooling of the refrigerator compartment 1 and the vegetable compartment 3. The forced defrost determination unit 16 inputs both detection temperatures of the air temperature sensor 11 in the cooler and the defrost return temperature sensor 12 from the elapse of this fixed time to the end of cooling of the refrigerating compartment 1 and the vegetable compartment 3. When the temperature difference between the two detected temperatures reaches a predetermined set value, a forced defrost signal is output. Further, the comp accumulated time measuring timer 15 is reset by the forced defrost signal. When the integration timer end signal from the comp integration time measurement timer 15 or the compulsory defrost signal from the compulsory defrosting determination unit 16 is output via the OR circuit 18, and the comp integration time measurement timer 15 counts a constant value. Alternatively, the defrosting is started when the forced defrosting determination unit 16 determines the forced defrosting.

【００２０】次に、図６のフローチャートを用いて強制
除霜判定部１６の強制除霜判定方法について説明する。
強制除霜判定部１６は、コンプ・ダンパ制御部１４から
モータダンパ開信号が送られた場合に（ステップ１０
１）、タイマ手段１７を動作させる（ステップ１０
２）。タイマ手段１７が一定時間の計測を終了したら
（ステップ１０３）、強制除霜判定部１６に計測終了を
伝え、強制除霜判定部１６はその時点より、次にダンパ
閉（ステップ１０７）となるまでの間冷却器内空気温度
センサ１１及び除霜復帰温度センサ１２の両検出値を入
力する（ステップ１０４）。タイマ手段１７による一定
時間の計測値は、図４に示すように、コンプレッサＯＮ
・モータダンパ開してから、冷凍サイクルの過渡応答及
び両センサ１１，１２の熱追従性を考慮して設定し、冷
凍サイクル及び両センサ１１，１２の温度が安定（平衡
状態）状態に到達してから両センサ１１，１２の検知温
度が入力できるように設定する。そして、冷却器内空気
温度センサ１１の検知温度と除霜復帰温度センサ１２の
検知温度との温度差が予め設定しておいた値以下となっ
た場合に（ステップ１０５，１０６）、強制除霜を開始
する。Next, the forced defrost determination method of the forced defrost determination unit 16 will be described with reference to the flowchart of FIG.
The forced defrost determination unit 16 receives the motor damper open signal from the comp / damper control unit 14 (step 10).
1), operate the timer means 17 (step 10)
2). When the timer means 17 has finished measuring the fixed time (step 103), the forced defrost determination section 16 is informed of the end of the measurement, and the forced defrost determination section 16 starts from that point until the damper is closed (step 107). During this period, both detection values of the air temperature sensor 11 in the cooler and the defrosting return temperature sensor 12 are input (step 104). As shown in FIG. 4, the value measured by the timer means 17 for a certain period of time is the compressor ON.
-After the motor damper is opened, the transient response of the refrigeration cycle and the heat followability of both sensors 11, 12 are set in consideration of the temperature of the refrigeration cycle and both sensors 11, 12 reaching a stable (equilibrium) state. Is set so that the temperatures detected by both sensors 11 and 12 can be input. Then, when the temperature difference between the temperature detected by the in-cooler air temperature sensor 11 and the temperature detected by the defrost return temperature sensor 12 is equal to or less than a preset value (steps 105 and 106), forced defrosting is performed. To start.

【００２１】図５に庫内強制加湿した場合の、冷却器内
部温度の温度変化を示す。このデータは、横軸に試験開
始からの運転時間をとり、モータダンパ７のＯＮ／ＯＦ
Ｆサイクル毎の温度をプロットしたものである。時間と
ともに、冷却器中央部（冷蔵室・野菜室からの空気リタ
ーン部）に着霜が進行し、冷却器内空気温度センサ１１
に当たる風量が減少して、温度が低下し、完全に詰まる
と最終的には除霜復帰温度センサ１２の温度と同じにな
る。前記設定値は、例えば０℃と設定し、限界着霜量と
なるまでに除霜に入るようにしている。FIG. 5 shows the temperature change of the internal temperature of the cooler when the inside of the refrigerator is forcibly humidified. In this data, the horizontal axis shows the operation time from the start of the test, and the ON / OF of the motor damper 7
It is a plot of the temperature for each F cycle. As time passes, frost formation progresses in the central part of the cooler (the air return part from the refrigerator compartment and the vegetable compartment), and the air temperature sensor inside the cooler 11
When the amount of the air blown onto the sensor decreases, the temperature decreases, and when the temperature is completely clogged, the temperature finally becomes the same as the temperature of the defrost return temperature sensor 12. The set value is set to 0 ° C., for example, and defrosting is started before the amount of frost formation reaches the limit.

【００２２】上述したように、本実施例では、温度セン
サを１個追加するだけで、冷蔵室１・野菜室３からの庫
内食品水分蒸発が多い場合又は長時間半扉等での異常着
霜時に過着霜となる前に強制除霜を開始できる。このた
め、除霜周期決定において、通常使用における扉開閉
数、外気湿度のみを考慮して設定すればよく、コンプレ
ッサ４の運転時間による除霜周期を従来より長く設定で
き、省電力となる。半扉で特に問題となるのは、庫内温
度がプラス域の冷蔵室１・野菜室３である。冷蔵室１・
野菜室３の長時間半扉の場合も庫内加湿と同様に着霜す
るため（冷却器へのリターンが同じ）、本実施例の構成
で過着霜となる前に除霜を開始することができる。As described above, in the present embodiment, by adding only one temperature sensor, if there is a large amount of food moisture evaporation from the refrigerating compartment 1 and the vegetable compartment 3 or if there is abnormal attachment at a half-door or the like for a long time. Forced defrost can be started before over-frosting occurs during frost. Therefore, in determining the defrosting cycle, it suffices to set only the number of doors opened / closed during normal use and the outside air humidity, and the defrosting cycle depending on the operating time of the compressor 4 can be set longer than in the past, resulting in power saving. A particular problem with the half-door is the refrigerator compartment 1 and the vegetable compartment 3 in which the inside temperature is in the positive range. Refrigerator 1
Even in the case where the vegetable compartment 3 is open for a long time with half a door, frost is formed in the same manner as in-room humidification (the return to the cooler is the same). Therefore, with the configuration of this embodiment, defrosting should be started before overfrost formation. You can

【００２３】また冷却器内空気温度センサ１１の検知温
度と除霜復帰温度センサ１２の検知温度との相対差によ
り除霜開始時期を決定するため、例えば外気温度低下に
より冷却器蒸発温度が低下し、その影響で冷却器内空気
温度が低下した場合でも、冷却器５自体の温度低下によ
り除霜復帰温度センサ１２の検知温度も同様に低下する
ため、相対差としては温度の影響を殆んど受けず、半扉
状態で冷却器５の温度が上昇した場合には冷却器内空気
温度センサ１１の検知温度も同様に上昇する。つまり外
気温度変化及び半扉状態においても、確実に除霜開始時
期を決定できる。さらに、冷蔵室１冷却時の安定時の温
度により着霜劣化を検知するため、精度よく温度を検出
でき、誤検知を防止できる。コンプレッサ４のＯＦＦ時
は、ファン６も回転していないため、冷却器内空気温度
センサ１１の検知温度は冷却器温度つまり除霜復帰温度
センサ１２の検知温度に近づく。そのため、コンプレッ
サ４のＯＮ、モータダンパ７の開よりすぐに温度検知を
して除霜判定をした場合には、温度差が除霜開始設定値
となっている可能性があり、誤除霜に入ってしまう可能
性がある（図４参照）。Further, since the defrosting start time is determined by the relative difference between the temperature detected by the air temperature sensor 11 inside the cooler and the temperature detected by the defrost return temperature sensor 12, for example, the evaporating temperature of the cooler decreases due to a decrease in the outside air temperature. Even when the temperature of the air inside the cooler decreases due to that effect, the temperature detected by the defrost return temperature sensor 12 also decreases due to the decrease in the temperature of the cooler 5 itself, and therefore the effect of temperature is almost negligible as a relative difference. If the temperature of the cooler 5 rises in the half-door state without receiving it, the temperature detected by the air temperature sensor 11 inside the cooler also rises. That is, the defrosting start timing can be reliably determined even when the outside air temperature changes and the half-door state. Furthermore, since frosting deterioration is detected by the stable temperature when the refrigerating compartment 1 is cooled, it is possible to detect the temperature with high accuracy and prevent erroneous detection. When the compressor 4 is off, the fan 6 is not rotating, so the temperature detected by the air temperature sensor 11 in the cooler approaches the temperature of the cooler, that is, the temperature detected by the defrost return temperature sensor 12. Therefore, when the temperature is detected immediately after the compressor 4 is turned on and the motor damper 7 is opened and the defrosting determination is made, the temperature difference may be the defrosting start set value, and the erroneous defrosting may occur. May occur (see FIG. 4).

【００２４】第２の実施例図７のフローチャート及び図８の扉開閉時の温度データ
入力タイミングを用いて、第２の実施例を説明する。冷
蔵庫の除霜制御装置及び冷蔵庫の構成は、前記図１〜図
３のものが適用される。Second Embodiment A second embodiment will be described with reference to the flow chart of FIG. 7 and the temperature data input timing when the door is opened and closed as shown in FIG. The defrosting control device of the refrigerator and the configurations of the refrigerator are those shown in FIGS.

【００２５】本実施例では、図７のフローチャートに示
すように、モータダンパ７の開で冷蔵室１・野菜室３の
冷却が開始されたとき、タイマ手段１７による計測中
（ステップ２０２，２０３のＮＯ）、又は冷却器内空気
温度センサ１１及び除霜復帰温度センサ１２の両検出値
の入力中（ステップ２０６，２０７のＮＯ）に冷蔵室１
・野菜室３の扉が開いた場合には（ステップ２０４，２
０８の各ＹＥＳ）、強制除霜判定部１６はその時点より
タイマ手段１７の計測動作又はセンサ温度計測を一時中
止する。その後、扉が閉まってから（ステップ２０５の
ＹＥＳ）、タイマ手段１７を再動作させ（ステップ２０
２）、タイマ手段１７が一定時間の測定を終了してから
（ステップ２０３のＹＥＳ）、再び冷却器内空気温度セ
ンサ１１及び除霜復帰温度センサ１２の両検出値の入力
（ステップ２０６）及び計測を継続する（ステップ２０
７）。タイマ設定値は、冷凍サイクルの過渡応答時間及
び両温度センサ１１，１２の熱応答性を考慮して設定す
る。In the present embodiment, as shown in the flow chart of FIG. 7, when the cooling of the refrigerator compartment 1 and the vegetable compartment 3 is started by opening the motor damper 7, the timer means 17 is measuring (NO in steps 202 and 203). ), Or during input of both detection values of the air temperature sensor 11 inside the cooler and the defrost return temperature sensor 12 (NO in steps 206 and 207).
-When the door of the vegetable compartment 3 is opened (steps 204, 2
08: YES), the forced defrosting determination unit 16 suspends the measurement operation of the timer unit 17 or the sensor temperature measurement from that point. Then, after the door is closed (YES in step 205), the timer means 17 is restarted (step 20).
2) After the timer means 17 finishes measuring for a certain period of time (YES in step 203), input of both detected values of the in-cooler air temperature sensor 11 and the defrost return temperature sensor 12 (step 206) and measurement again. (Step 20)
7). The timer set value is set in consideration of the transient response time of the refrigeration cycle and the thermal responsiveness of both temperature sensors 11 and 12.

【００２６】上述したように、本実施例では、扉が開い
た場合には、ファン６が停止するので、図８に示すよう
に、冷却器内空気温度センサ１１の検出値は冷却器温度
に近づいていき、温度が低下していく。そのため、扉開
閉時に検出した場合、温度が低下したと判断し、誤って
除霜に入るおそれがある。また扉が閉まってからすぐ検
知した場合、冷凍サイクルの過渡応答時間及び両温度セ
ンサ１１，１２の熱応答性によりすぐには安定せず、そ
のため、この区間で計測した場合でも誤検知のおそれが
ある。本実施例の構成にした場合は、扉が開いて閉まっ
てから安定温度に戻るまでの間、計測を中止するため、
上記誤検知を防止することができる。As described above, in this embodiment, when the door is opened, the fan 6 is stopped. Therefore, as shown in FIG. 8, the detected value of the air temperature sensor 11 inside the cooler corresponds to the cooler temperature. As you get closer, the temperature drops. Therefore, if it is detected when the door is opened / closed, it is determined that the temperature has dropped, and there is a risk of accidentally entering defrosting. In addition, if it is detected immediately after the door is closed, it will not be stable immediately due to the transient response time of the refrigeration cycle and the thermal responsiveness of both temperature sensors 11 and 12. Therefore, there is a risk of erroneous detection even when measuring in this section. is there. In the case of the configuration of this embodiment, since the measurement is stopped until the temperature returns to the stable temperature after the door is opened and closed,
The above false detection can be prevented.

【００２７】第３の実施例本実施例において、冷蔵庫の除霜制御装置は、前記図１
からタイマ手段１７を除いた構成のものが適用され、冷
蔵庫は前記図２、図３の構成のものが適用される。Third Embodiment In this embodiment, the defrost control device for a refrigerator is the same as that shown in FIG.
The configuration of the refrigerator excluding the timer means 17 is applied, and the refrigerator of the configuration of FIGS. 2 and 3 is applied.

【００２８】本実施例では、前記第１の実施例における
タイマ手段の代りに、強制除霜判定部１６が冷蔵室１・
野菜室３の冷却開始時より冷却器内空気温度センサ１１
の検知温度或いは除霜復帰温度センサ１２の検知温度の
温度変化率を求める。そして、この温度変化率が予め実
験にて設定した温度変化率以下、即ち温度変化が極めて
小さく安定した区間において、前記第１の実施例と同様
の除霜開始を判定する。扉開閉時でも同様に、扉が閉ま
ってから温度変化率測定を開始し、設定変化率以下とな
った時点より再び除霜開始判定を行う。In the present embodiment, instead of the timer means in the first embodiment, the forced defrost judging section 16 has a refrigerating chamber 1.
Air temperature sensor 11 in the cooler from the start of cooling the vegetable compartment 3
Or the temperature change rate of the detection temperature of the defrosting recovery temperature sensor 12 is obtained. Then, when the temperature change rate is equal to or lower than the temperature change rate set in advance in the experiment, that is, in a section in which the temperature change is extremely small and stable, the start of defrosting similar to that in the first embodiment is determined. Similarly, when the door is opened / closed, the temperature change rate measurement is started after the door is closed, and the defrosting start determination is performed again when the temperature becomes equal to or lower than the set change rate.

【００２９】第４の実施例本実施例では、冷蔵庫は前記図２、図３の構成のものが
適用され、冷蔵庫の除霜制御装置は、前記図１の構成に
おけるコンプ積算時間計測タイマ１５とＯＲ回路１８と
の間に次のような構成要素が付加されている。即ち、コ
ンプ積算時間計測タイマ１５によるコンプレッサ４の運
転時間計測中の外気温度及び扉開閉数をそれぞれ検知す
る外気温度検知手段１９及び扉開閉数検知手段２０と、
コンプ積算時間計測タイマ１５で一定のコンプレッサ運
転時間が計測された後、外気温度と扉開閉数により除霜
猶予時間を実時間にて決定する除霜猶予時間決定手段２
１と、この除霜猶予時間決定手段２１で決定された除霜
猶予時間が経過したか否かを判断し、経過した場合に除
霜信号を出力して除霜開始を行わせる除霜猶予判断手段
２２とが設けられている。また第１の実施例で説明した
強制除霜判定部１６を有し、過着霜を検知した場合には
除霜猶予判断手段２２側からの除霜判断に優先して強制
除霜を行う構成となっている。Fourth Embodiment In the present embodiment, the refrigerator having the configuration shown in FIGS. 2 and 3 is applied, and the defrosting control device for the refrigerator has the compressor integrated time measuring timer 15 in the configuration shown in FIG. The following constituent elements are added to the OR circuit 18. That is, an outside air temperature detecting means 19 and a door opening / closing number detecting means 20 for detecting an outside air temperature and a door opening / closing number during the operation time of the compressor 4 is being measured by the compressor integrated time measuring timer 15, respectively.
Defrost deferral time determining means 2 for determining the defrost deferral time in real time according to the outside air temperature and the number of doors opened / closed after the compressor accumulated time measurement timer 15 measures a certain compressor operating time.
1 and whether or not the defrost grace time determined by the defrost grace time determination means 21 has elapsed, and when it has elapsed, a defrost signal is output to start defrost grace determination. Means 22 and are provided. In addition, the forced defrosting determination unit 16 described in the first embodiment is provided, and when over-frosting is detected, the forced defrosting is prioritized by the defrosting determination from the defrosting grace determining unit 22 side. Has become.

【００３０】本実施例は、上記の構成とすることによ
り、冷蔵室１・野菜室３からの庫内食品水分蒸発が多い
場合及び長時間半扉等での異常着霜時に過着霜となる前
に強制除霜判定部１６側で強制除霜を開始できるため、
除霜猶予判断手段２２側の除霜猶予時間決定において、
異常使用状態を考慮せず扉開閉数、外気湿度より外部か
ら浸入してくる水分量のみを考慮して設定すればよく、
除霜猶予時間を従来より長く設定でき、通常使用時にお
いて約倍の省電力効果が得られる。In this embodiment, with the above-mentioned configuration, over-frosting occurs when there is a large amount of food moisture evaporation from the refrigerating compartment 1 and the vegetable compartment 3 and when abnormal frosting occurs on a half-door or the like for a long time. Since the forced defrost determination unit 16 side can start forced defrost before,
In determining the defrost grace time on the side of the defrost grace judgment means 22,
It is sufficient to set only the number of doors opened and closed and the amount of water entering from the outside rather than the humidity of the outside air without considering the abnormal use state.
The defrost grace time can be set longer than before, and the power saving effect is about doubled during normal use.

【００３１】第５の実施例図９乃至図１２に基づいて第５の実施例を説明する。本
実施例の除霜制御装置は、図９に示すように、上記第４
の実施例における除霜制御装置に、さらに融解時間タイ
マを内蔵した除霜制御部２３が付加されている。本実施
例では、図１０に示すように、霜の融解状態継続時間
（除霜時間）より実際の着霜量を推定することが行われ
る。Fifth Embodiment A fifth embodiment will be described with reference to FIGS. 9 to 12. As shown in FIG. 9, the defrosting control device according to the present embodiment, as shown in FIG.
The defrost control unit 23 having a built-in melting time timer is added to the defrost control device according to the embodiment. In the present embodiment, as shown in FIG. 10, the actual amount of frost formation is estimated from the duration of the frost melting state (defrosting time).

【００３２】図１２のフローチャートを用いて除霜時の
動作を説明する。除霜制御部２３は除霜開始（ステップ
３０１）から除霜復帰温度センサ１２の検出値が−２℃
になった時点より（ステップ３０２）、融解時間タイマ
による融解状態継続時間（除霜時間）の時間計測をスタ
ートする（ステップ３０３）。そして除霜復帰温度セン
サ１２の検出値が＋２℃になった時点で（ステップ３０
４）、融解時間タイマによる時間計測を停止させる（ス
テップ３０５）。そして、除霜終了後（ステップ３０
６，３０７）、図１１の着霜量−融解時間の実験データ
より、着霜量が限界着霜量以下であることを確認するた
め、限界着霜量での融解時間を所定の設定時間として予
め記憶しておき、この設定時間とタイマ計測された融解
状態継続時間とを比較し、計測値が設定値より大きい場
合に、システムの異常（センサ特性変動等）と判断する
（ステップ３０８）。異常と判断した場合は、それ以降
において除霜猶予判定を行わず、コンプ積算時間計測タ
イマ１５による一定のコンプレッサ積算時間を計測した
時点で除霜を開始するよう制御する（ステップ３０
９）。The operation during defrosting will be described with reference to the flowchart of FIG. The defrost control unit 23 has detected the defrost return temperature sensor 12 at −2 ° C. from the start of defrost (step 301).
From the point of time (step 302), time measurement of the melting state duration time (defrosting time) by the melting time timer is started (step 303). Then, when the detection value of the defrosting temperature sensor 12 reaches + 2 ° C. (step 30
4) Stop the time measurement by the melting time timer (step 305). Then, after defrosting is completed (step 30
6, 307), from the experimental data of the frost formation amount-melting time of FIG. 11, in order to confirm that the frost formation amount is equal to or less than the limit frost formation amount, the melting time at the limit frost formation amount is set as a predetermined set time. It is stored in advance, and this set time is compared with the time measured by the timer to measure the melting state. If the measured value is larger than the set value, it is determined that the system is abnormal (sensor characteristic variation or the like) (step 308). When it is determined that there is an abnormality, the defrost delay determination is not performed thereafter, and the defrosting is controlled to start at the time when the compressor accumulated time measuring timer 15 measures a constant compressor accumulated time (step 30).
9).

【００３３】上述のように、本実施例では、システムの
正常動作を検証するシステムを追加することにより、シ
ステムの信頼性向上が図れ、また異常時（センサ故障等
による）にはコンプ積算時間計測タイマ１５による除霜
開始方法に切り換えることにより、システム異常時で
も、性能劣化（過着霜）を引き起こさずに正常運転を継
続することが可能になる。As described above, in this embodiment, by adding a system for verifying the normal operation of the system, the reliability of the system can be improved, and at the time of abnormality (due to sensor failure, etc.), the accumulated integration time is measured. By switching to the method for starting defrosting by the timer 15, it becomes possible to continue normal operation without causing performance deterioration (over-frosting) even when the system is abnormal.

【００３４】第６の実施例図９の除霜制御装置を用いて第６の実施例を説明する。
強制除霜判定部１６は常時冷却器内空気温度センサ１１
及び除霜復帰温度センサ１２のオープン・ショートを監
視し、両センサ１１，１２の正常動作を判定している。
その判定方法は、通常使用状態における温度範囲を設定
し、両センサ１１，１２のうちの少なくとも何れかがそ
の温度範囲を超えた場合に異常と判断する。異常と判断
した場合は、それ以降は強制除霜判定を行わず無条件に
コンプ積算時間計測タイマ１５側において一定のコンプ
レッサ積算時間を計測した時点で除霜を開始するように
制御する。Sixth Embodiment A sixth embodiment will be described using the defrosting control device shown in FIG.
The forced defrosting determination unit 16 always uses the air temperature sensor 11 in the cooler.
Also, the open / short state of the defrosting recovery temperature sensor 12 is monitored to determine the normal operation of both sensors 11, 12.
The determination method sets a temperature range in a normal use state, and determines that it is abnormal when at least one of the sensors 11 and 12 exceeds the temperature range. If it is determined to be abnormal, the defrosting determination is not performed thereafter, and the defrosting is controlled to start unconditionally on the side of the compressor accumulated time measuring timer 15 when a certain compressor accumulated time is measured.

【００３５】上述のように、本実施例では、センサ異常
時に除霜開始を固定のコンプ積算時間計測タイマ方式に
切り換えることにより、異常時においても性能劣化（過
着霜）を引き起こさずに正常運転を継続することができ
る。As described above, in this embodiment, when the sensor is abnormal, the defrosting start is switched to the fixed comp integration time measuring timer system, so that the normal operation without causing the performance deterioration (over-frosting) even when the sensor is abnormal. Can continue.

【００３６】[0036]

【発明の効果】以上説明したように、請求項１記載の発
明によれば、圧縮機の運転時間を積算し、該運転時間が
一定値に達した時、除霜を開始する冷蔵庫の除霜制御装
置において、冷却器内における冷蔵室・野菜室からのリ
ターン空気の流路上に設置され該リターン空気の温度を
検知する冷却器内空気温度検知手段と、前記冷却器自体
の温度を検知する除霜復帰温度検知手段と、前記冷蔵室
・野菜室の冷却開始時から一定時間を計測するタイマ手
段と、該タイマ手段で計測された一定時間の経過後から
前記冷蔵室・野菜室の冷却終了までの間前記冷却器内空
気温度検知手段及び除霜復帰温度検知手段の両検知温度
を入力し該両検知温度の温度差が所定の設定値に到達し
た時には前記積算中の運転時間をリセットして強制的に
除霜を開始させる強制除霜開始手段とを具備させたた
め、強制除霜開始手段により、冷蔵室・野菜室冷却時の
安定状態における冷却器内空気温度検知手段及び除霜復
帰温度検知手段の両検知温度の相対差により強制除霜開
始時期が決定されるので、外気温度変化及び半扉状態等
においても確実に強制除霜開始時期を決定することがで
きる。したがって冷蔵室・野菜室に水分蒸発量の多い食
品が入れられた場合や半扉状態等、通常使用時では発生
頻度の少ない異常着霜条件時に、過着霜となる前に強制
除霜を確実に開始させることができる。この結果、扉開
閉頻度の少ない通常使用状態における圧縮機運転時間を
基にした除霜周期を従来より長く設定することができて
省電力を図ることができる。As described above, according to the first aspect of the present invention, the defrosting of the refrigerator is performed in which the operating time of the compressor is integrated and defrosting is started when the operating time reaches a certain value. In the control device, a cooler air temperature detecting means for detecting the temperature of the return air, which is installed on the flow path of the return air from the refrigerating room / vegetable room in the cooler, and a controller for detecting the temperature of the cooler itself. Frost recovery temperature detecting means, timer means for measuring a fixed time from the start of cooling of the refrigerating / vegetable compartment, and after the elapse of the fixed time measured by the timer means until the end of cooling of the refrigerating / vegetable compartment During this period, both detection temperatures of the air temperature detecting means in the cooler and the defrosting recovery temperature detecting means are input, and when the temperature difference between the both detected temperatures reaches a predetermined set value, the operating time during the integration is reset. Force defrost to start Since the defrosting / defrosting starting means is provided, the relative difference between the detected temperatures of the air temperature detecting means inside the cooler and the defrosting returning temperature detecting means in the stable state during cooling of the refrigerating room / vegetable room by the forced defrosting starting means. Since the forced defrost start timing is determined by the above, the forced defrost start timing can be reliably determined even when the outside air temperature changes, the half-door state, and the like. Therefore, under abnormal frost conditions that are rarely generated during normal use, such as when food with a large amount of water evaporation is put in the refrigerator / vegetable room or in the half-door state, forced defrosting is ensured before overfrosting occurs. Can be started. As a result, the defrost cycle based on the compressor operating time in the normal use state where the door opening / closing frequency is low can be set longer than in the conventional case, and power can be saved.

【００３７】請求項２記載の発明によれば、前記冷蔵室
・野菜室の冷却時に冷蔵庫の扉が開いたときは、前記強
制除霜開始手段は、前記扉が開いた時点から該扉が閉ま
った後、前記タイマ手段で一定時間が再計測されるまで
の間は前記両検知温度の温度差に基づく除霜開始の判断
を中止するように構成したため、冷蔵室・野菜室の冷却
時に扉が開くと冷蔵室・野菜室からのリターン空気の流
れが止まって冷却器内空気温度検知手段の検知温度が変
動することから、強制除霜開始時期の誤判断を防止する
ことができる。According to the second aspect of the present invention, when the refrigerator door is opened during the cooling of the refrigerating / vegetable compartment, the forced defrosting starting means closes the door from the time when the door is opened. After that, it is configured to stop the defrosting start determination based on the temperature difference between the two detected temperatures until the timer measures a certain time again, so that the door is closed when the refrigerating room / vegetable room is cooled. When opened, the flow of return air from the refrigerating compartment / vegetable compartment stops and the temperature detected by the air temperature detecting means in the cooler fluctuates, so that it is possible to prevent erroneous determination of the forced defrosting start time.

【００３８】請求項３記載の発明によれば、圧縮機の運
転時間を積算し、該運転時間が一定値に達した時、除霜
を開始する冷蔵庫の除霜制御装置において、冷却器内に
おける冷蔵室・野菜室からのリターン空気の流路上に設
置され該リターン空気の温度を検知する冷却器内空気温
度検知手段と、前記冷却器自体の温度を検知する除霜復
帰温度検知手段と、前記冷蔵室・野菜室の冷却開始時か
ら冷却終了までの間前記冷却器内空気温度検知手段及び
除霜復帰温度検知手段の両検知温度を入力し該両検知温
度のうちの少なくとも何れか一方の検知温度の変化率が
所定の設定変化率以下の区間において前記両検知温度の
温度差が所定の設定値に到達した時には前記積算された
運転時間をリセットして強制的に除霜を開始させる強制
除霜開始手段とを具備させたため、冷蔵室・野菜室の冷
却開始時から一定時間の経過後は、リターン空気温度及
び冷却器温度は安定状態となることから、前記請求項１
記載の発明の効果と同様の効果が得られる。According to the third aspect of the invention, in the defrost control device for a refrigerator, which integrates the operating time of the compressor and starts defrosting when the operating time reaches a certain value, in the cooler. An air temperature detecting means in a cooler installed on a flow path of return air from a refrigerating room / vegetable room to detect a temperature of the return air, a defrost return temperature detecting means to detect a temperature of the cooler itself, From the start of cooling of the refrigerating room / vegetable compartment to the end of cooling, both detection temperatures of the air temperature detecting means in the cooler and the defrosting recovery temperature detecting means are inputted and at least one of the both detected temperatures is detected. When the temperature difference between the detected temperatures reaches a predetermined set value in a section where the temperature change rate is equal to or lower than a predetermined set change rate, the accumulated operating time is reset to forcibly start defrosting. With frost starting means Since was Bei, after a predetermined time from the time of start of cooling of the refrigerating compartment and vegetable chamber, the return air temperature and condenser temperature from becoming a stable state, claim 1
The same effects as those of the described invention can be obtained.

【００３９】請求項４記載の発明によれば、圧縮機の運
転時間を積算する積算時間計測手段と、該積算時間計測
手段で積算された圧縮機の運転時間が一定値に達した
後、当該運転時間の積算中における冷蔵庫の扉の開閉数
と外気温度を基に除霜開始猶予時間を設定し、この除霜
開始猶予時間の経過後に除霜を開始させる除霜猶予判断
手段とを有する冷蔵庫の除霜制御装置において、冷却器
内における冷蔵室・野菜室からのリターン空気の流路上
に設置され該リターン空気の温度を検知する冷却器内空
気温度検知手段と、前記冷却器自体の温度を検知する除
霜復帰温度検知手段と、前記冷蔵室・野菜室の冷却開始
時から一定時間を計測するタイマ手段と、該タイマ手段
で計測された一定時間の経過後から前記冷蔵室・野菜室
の冷却終了までの間前記冷却器内空気温度検知手段及び
除霜復帰温度検知手段の両検知温度を入力し該両検知温
度の温度差が所定の設定値に到達した時には前記積算時
間計測手段で積算中の運転時間をリセットして強制的に
除霜を開始させる強制除霜開始手段とを具備させたた
め、強制除霜開始手段により、冷蔵室・野菜室に水分蒸
発量の多い食品が入れられた場合や半扉状態等、通常使
用時では発生頻度の少ない異常着霜条件時に、過着霜と
なる前に強制除霜を確実に開始させることができるの
で、除霜猶予判断手段は異常使用状態を考慮することな
く通常使用時の扉開閉数と外気温度を基に除霜開始猶予
時間を設定すればよく、除霜開始猶予時間を従来より長
く設定することができて省電力を図ることができる。According to the fourth aspect of the present invention, the integrated time measuring means for integrating the operating time of the compressor, and the operating time of the compressor accumulated by the integrated time measuring means reach a constant value, A refrigerator having a defrost grace judgment means for setting a defrost start grace time based on the number of open / closed doors of the refrigerator and the outside air temperature during integration of the operating time, and for starting defrost after the lapse of the defrost start grace time. In the defrost control device, the temperature inside the cooler itself, which is installed on the flow path of the return air from the refrigerating room / vegetable room in the cooler and detects the temperature of the return air, and the temperature of the cooler itself. Defrost return temperature detecting means for detecting, timer means for measuring a fixed time from the start of cooling of the refrigerating room / vegetable compartment, and the refrigerating room / vegetable compartment after the elapse of the fixed time measured by the timer means. Until the end of cooling Note: When both detected temperatures of the cooler internal air temperature detection means and the defrost recovery temperature detection means are input and the temperature difference between the detected temperatures reaches a predetermined set value, the operating time during integration by the integrated time measuring means is changed. Since the forced defrost starter that resets and forcibly starts defrosting is provided, the forced defrost starter puts food with a large amount of water evaporation into the refrigerating / vegetable compartments or a half-door state. For example, under abnormal frost conditions that are rarely generated during normal use, forced defrost can be reliably started before overfrost occurs, so the defrost grace determination means does not consider abnormal use conditions. It is only necessary to set the defrost start grace time based on the number of doors opened and closed and the outside air temperature during normal use, and the defrost start grace time can be set longer than in the past and power saving can be achieved.

【００４０】請求項５記載の発明によれば、除霜中に除
霜時間を計測し、該除霜時間が所定の設定時間を超えた
ときは、次回からは前記除霜猶予判断手段による除霜開
始猶予時間の設定を中止して前記積算時間計測手段で積
算された圧縮機の運転時間が一定値に達した時に除霜を
開始させるように構成したため、除霜時間が所定の設定
時間を超えたときは、システムの異常（検知手段の特性
変動等）と判断することができるので、システム異常時
でも正常運転に近い状態を継続させることができる。According to the fifth aspect of the invention, the defrosting time is measured during defrosting, and when the defrosting time exceeds a predetermined set time, the defrosting delay judging means removes the defrosting time from the next time. The defrosting start time is set to a predetermined set time because the defrosting is started when the operation time of the compressor accumulated by the accumulated time measuring means reaches a certain value by stopping the setting of the frost start grace time. When it exceeds, it can be judged that the system is abnormal (variation of the characteristic of the detecting means), and thus the state close to normal operation can be continued even when the system is abnormal.

【００４１】請求項６記載の発明によれば、前記冷却器
内空気温度検知手段又は除霜復帰温度検知手段の少なく
とも何れかの異常を検出したときは、次回からは前記強
制除霜開始手段による強制除霜の開始を中止させるよう
に構成したため、温度検知手段の異常時でも、少なくと
も通常使用状態での正常運転を継続させることができ
る。According to the sixth aspect of the invention, when the abnormality in at least one of the air temperature detecting means in the cooler and the defrosting recovery temperature detecting means is detected, the forced defrosting starting means is used from the next time. Since the start of the forced defrosting is stopped, it is possible to continue the normal operation at least in the normal use state even when the temperature detecting means is abnormal.

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

【図１】本発明に係る冷蔵庫の除霜制御装置の第１の実
施例を示すブロック図である。FIG. 1 is a block diagram showing a first embodiment of a defrost control device for a refrigerator according to the present invention.

【図２】上記第１の実施例に適用される冷蔵庫の内部構
成を示す断面図である。FIG. 2 is a cross-sectional view showing the internal configuration of the refrigerator applied to the first embodiment.

【図３】上記冷蔵庫における冷却器周辺の構成を示す図
である。FIG. 3 is a diagram showing a configuration around a cooler in the refrigerator.

【図４】上記第１の実施例において強制除霜判定部への
温度情報の入力タイミングを説明するための図である。FIG. 4 is a diagram for explaining an input timing of temperature information to the forced defrosting determination unit in the first embodiment.

【図５】上記第１の実施例において庫内強制加湿したと
きの冷却器内部温度の変化例を示す図である。FIG. 5 is a diagram showing an example of changes in the cooler internal temperature when forced internal humidification is performed in the first embodiment.

【図６】上記第１の実施例の強制除霜判定方法を説明す
るための制御フローチャートである。FIG. 6 is a control flowchart for explaining the forced defrosting determination method of the first embodiment.

【図７】本発明の第２の実施例における強制除霜判定方
法を説明するための制御フローチャートである。FIG. 7 is a control flow chart for explaining a forced defrosting determination method according to the second embodiment of the present invention.

【図８】上記第２の実施例において扉開閉時の強制除霜
判定部への温度情報入力タイミングを説明するための図
である。FIG. 8 is a diagram for explaining the timing of inputting temperature information to the forced defrosting determination unit when the door is opened and closed in the second embodiment.

【図９】本発明の第５の実施例を示すブロック図であ
る。FIG. 9 is a block diagram showing a fifth embodiment of the present invention.

【図１０】上記第５の実施例において着霜量と除霜時間
・融解時間との関係例を示す図である。FIG. 10 is a diagram showing an example of the relationship between the frost formation amount and the defrosting time / melting time in the fifth embodiment.

【図１１】上記第５の実施例において除霜時の除霜復帰
温度センサの検知温度の変化を示す図である。FIG. 11 is a diagram showing changes in the temperature detected by the defrosting return temperature sensor during defrosting in the fifth embodiment.

【図１２】上記第５の実施例の作用を説明するための制
御フローチャートである。FIG. 12 is a control flow chart for explaining the operation of the fifth embodiment.

【符号の説明】[Explanation of symbols]

１冷蔵室２冷凍室３野菜室４圧縮機（コンプレッサ）５冷却器（エバポレータ）８冷凍室温度センサ９冷蔵室温度センサ１１冷却器内空気温度センサ（冷却器内空気温度検知
手段）１２除霜復帰温度センサ（除霜復帰温度検知手段）１４コンプ・ダンパ制御部１５コンプ積算時間計測タイマ（コンプ積算時間計測
手段）１６強制除霜判定部（強制除霜開始手段）１７タイマ手段１９外気温度検知手段２０扉開閉数検知手段２１除霜猶予時間決定手段２２除霜猶予判断手段２３除霜制御部1 Refrigerator Room 2 Freezer Room 3 Vegetable Room 4 Compressor (Compressor) 5 Cooler (Evaporator) 8 Freezer Room Temperature Sensor 9 Refrigerator Room Temperature Sensor 11 Cooler Inside Air Temperature Sensor (Cooler Inside Air Temperature Detector) 12 Defrosting Return temperature sensor (defrost return temperature detection means) 14 Comp / damper control section 15 Comp integrated time measurement timer (compress integrated time measurement means) 16 Forced defrost determination section (forced defrost start means) 17 Timer means 19 Outside temperature detection Means 20 Door open / closed number detection means 21 Defrost grace time determination means 22 Defrost grace judgment means 23 Defrost control section

───────────────────────────────────────────────────── フロントページの続き (72)発明者天明稔神奈川県横浜市磯子区新杉田町８番地株式会社東芝住空間システム技術研究所内 (72)発明者本郷裕子神奈川県横浜市磯子区新杉田町８番地株式会社東芝住空間システム技術研究所内 (72)発明者楠敦神奈川県横浜市磯子区新杉田町８番地株式会社東芝住空間システム技術研究所内 (72)発明者朝倉啓明東京都港区新橋３丁目３番９号東芝エー・ブイ・イー株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minoru Tenmei, Minoru Tenmei 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa, Ltd. Inside the Toshiba Living Space Systems Engineering Laboratory (72) Incorporator, Yuko Hongo 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Address Incorporated company Toshiba Living Space Systems Engineering Laboratory (72) Inventor Atsushi Kusunoki 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Incorporated Toshiba Living Space Systems Engineering Laboratory (72) Incorporator Hiroaki Asakura Shimbashi, Minato-ku, Tokyo 3-3-9 Toshiba Abu E Co., Ltd.

Claims

【特許請求の範囲】[Claims]

【請求項１】圧縮機の運転時間を積算し、該運転時間
が一定値に達した時、除霜を開始する冷蔵庫の除霜制御
装置において、冷却器内における冷蔵室・野菜室からの
リターン空気の流路上に設置され該リターン空気の温度
を検知する冷却器内空気温度検知手段と、前記冷却器自
体の温度を検知する除霜復帰温度検知手段と、前記冷蔵
室・野菜室の冷却開始時から一定時間を計測するタイマ
手段と、該タイマ手段で計測された一定時間の経過後か
ら前記冷蔵室・野菜室の冷却終了までの間前記冷却器内
空気温度検知手段及び除霜復帰温度検知手段の両検知温
度を入力し該両検知温度の温度差が所定の設定値に到達
した時には前記積算中の運転時間をリセットして強制的
に除霜を開始させる強制除霜開始手段とを有することを
特徴とする冷蔵庫の除霜制御装置。1. In a defrost control device for a refrigerator, which integrates the operating time of a compressor and starts defrosting when the operating time reaches a certain value, a return from a refrigerating room / vegetable room in a cooler. An air temperature detecting means in the cooler installed on the air flow path for detecting the temperature of the return air, a defrost return temperature detecting means for detecting the temperature of the cooler itself, and a cooling start of the refrigerating room / vegetable room Time means for measuring a fixed time from time, and after the elapse of the fixed time measured by the timer means until the end of cooling of the refrigerating room / vegetable room, the cooler air temperature detecting means and defrost return temperature detection Means for inputting both detected temperatures of the means, and forcibly starting defrosting by resetting the operating time during the integration when the temperature difference between the detected temperatures reaches a predetermined set value. Of the refrigerator characterized by Defrost control device.

【請求項２】前記冷蔵室・野菜室の冷却時に冷蔵庫の
扉が開いたときは、前記強制除霜開始手段は、前記扉が
開いた時点から該扉が閉まった後、前記タイマ手段で一
定時間が再計測されるまでの間は前記両検知温度の温度
差に基づく除霜開始の判断を中止するように構成してな
ることを特徴とする請求項１記載の冷蔵庫の除霜制御装
置。2. When the refrigerator door is opened during cooling of the refrigerating compartment / vegetable compartment, the forced defrost starting means is fixed by the timer means after the door is closed after the door is opened. The defrosting control device for a refrigerator according to claim 1, wherein the determination of defrosting start based on the temperature difference between the both detected temperatures is stopped until the time is remeasured.

【請求項３】圧縮機の運転時間を積算し、該運転時間
が一定値に達した時、除霜を開始する冷蔵庫の除霜制御
装置において、冷却器内における冷蔵室・野菜室からの
リターン空気の流路上に設置され該リターン空気の温度
を検知する冷却器内空気温度検知手段と、前記冷却器自
体の温度を検知する除霜復帰温度検知手段と、前記冷蔵
室・野菜室の冷却開始時から冷却終了までの間前記冷却
器内空気温度検知手段及び除霜復帰温度検知手段の両検
知温度を入力し該両検知温度のうちの少なくとも何れか
一方の検知温度の変化率が所定の設定変化率以下の区間
において前記両検知温度の温度差が所定の設定値に到達
した時には前記積算された運転時間をリセットして強制
的に除霜を開始させる強制除霜開始手段とを有すること
を特徴とする冷蔵庫の除霜制御装置。3. A defrost control device for a refrigerator, which integrates the operating time of a compressor and starts defrosting when the operating time reaches a certain value, in a refrigerator, a return from a refrigerating room / vegetable room An air temperature detecting means in the cooler installed on the air flow path for detecting the temperature of the return air, a defrost return temperature detecting means for detecting the temperature of the cooler itself, and a cooling start of the refrigerating room / vegetable room From the time to the end of cooling, both detection temperatures of the air temperature detection means in the cooler and the defrost return temperature detection means are input, and the change rate of the detection temperature of at least one of the both detection temperatures is set to a predetermined value. When the temperature difference between the two detected temperatures reaches a predetermined set value in a section equal to or less than the rate of change, it has a forced defrost starting means for resetting the integrated operating time and forcibly starting defrost. Characteristic refrigerator Defrost control device.

【請求項４】圧縮機の運転時間を積算する積算時間計
測手段と、該積算時間計測手段で積算された圧縮機の運
転時間が一定値に達した後、当該運転時間の積算中にお
ける冷蔵庫の扉の開閉数と外気温度を基に除霜開始猶予
時間を設定し、この除霜開始猶予時間の経過後に除霜を
開始させる除霜猶予判断手段とを有する冷蔵庫の除霜制
御装置において、冷却器内における冷蔵室・野菜室から
のリターン空気の流路上に設置され該リターン空気の温
度を検知する冷却器内空気温度検知手段と、前記冷却器
自体の温度を検知する除霜復帰温度検知手段と、前記冷
蔵室・野菜室の冷却開始時から一定時間を計測するタイ
マ手段と、該タイマ手段で計測された一定時間の経過後
から前記冷蔵室・野菜室の冷却終了までの間前記冷却器
内空気温度検知手段及び除霜復帰温度検知手段の両検知
温度を入力し該両検知温度の温度差が所定の設定値に到
達した時には前記積算時間計測手段で積算中の運転時間
をリセットして強制的に除霜を開始させる強制除霜開始
手段とを有することを特徴とする冷蔵庫の除霜制御装
置。4. An integrated time measuring means for accumulating the operating time of the compressor, and a refrigerator during integration of the operating time after the operating time of the compressor accumulated by the integrated time measuring means reaches a constant value. A defrost control device for a refrigerator having a defrost start delay time setting unit that sets a defrost start delay time based on the number of open / closed doors and the outside air temperature, and starts defrost after the defrost start delay time elapses. An air temperature detector inside the cooler, which is installed on the flow path of return air from the refrigerating / vegetable compartment in the refrigerator and detects the temperature of the return air, and a defrost return temperature detector for detecting the temperature of the cooler itself. And a timer means for measuring a fixed time from the start of cooling the refrigerating / vegetable compartment, and the cooler from after the elapse of the fixed time measured by the timer means to the end of cooling of the refrigerating / vegetable compartment. Inner air temperature detection means When both the detected temperatures of the defrosting recovery temperature detection means are input and the temperature difference between the detected temperatures reaches a predetermined set value, the integrated time measuring means resets the operating time during integration to forcibly defrost. A defrosting control device for a refrigerator, comprising:

【請求項５】除霜中に除霜時間を計測し、該除霜時間
が所定の設定時間を超えたときは、次回からは前記除霜
猶予判断手段による除霜開始猶予時間の設定を中止して
前記積算時間計測手段で積算された圧縮機の運転時間が
一定値に達した時に除霜を開始させるように構成してな
ることを特徴とする請求項４記載の冷蔵庫の除霜制御装
置。5. The defrosting time is measured during defrosting, and when the defrosting time exceeds a predetermined set time, the setting of the defrosting start grace time by the defrost grace judging means is stopped from the next time. The defrosting control device for a refrigerator according to claim 4, wherein defrosting is started when the operating time of the compressor accumulated by the accumulated time measuring means reaches a constant value. .

【請求項６】前記冷却器内空気温度検知手段又は除霜
復帰温度検知手段の少なくとも何れかの異常を検出した
ときは、次回からは前記強制除霜開始手段による強制除
霜の開始を中止させるように構成してなることを特徴と
する請求項１，２，３又は４記載の冷蔵庫の除霜制御装
置。6. When the abnormality of at least one of the cooler internal air temperature detection means and the defrost return temperature detection means is detected, the forced defrost start means stops the forced defrost start from the next time. The defrosting control device for a refrigerator according to claim 1, 2, 3, or 4, wherein the defrosting control device is configured as described above.