JPS61232814A - Rice cooker having rice cooking amount discrimination function - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は炊飯量に見合った電力で炊飯を行なう炊飯量の
判別機能を有する炊飯器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rice cooker having a function of determining the amount of rice to be cooked, which uses electric power commensurate with the amount of rice to be cooked.

従来の技術 従来、この棟の炊飯器は特開昭５９−１９２３１７号公
報にも提案される如く炊飯途中で一時的に炊飯ヒーター
への通電を遮断後、内鍋の底部に熱的に結合する如く取
付けた感熱素子によって検出した内鍋の底部の温度が予
め設定された温度に達するまでの時間（例えば数分間）
によって炊飯量を判定し、以後の炊飯に必要な炊飯電力
を供給して炊飯を行なうものがあった。Conventional technology Conventionally, as proposed in Japanese Patent Application Laid-Open No. 59-192317, the rice cooker of this ridge temporarily cuts off electricity to the rice cooking heater during cooking, and then thermally connects it to the bottom of the inner pot. The time it takes for the temperature at the bottom of the inner pot to reach a preset temperature (for example, several minutes) as detected by a heat-sensitive element installed
Some rice cookers determine the amount of rice to be cooked, and then supply the rice cooking power necessary for subsequent rice cooking.

発明が解決しようとする問題点 しかるに、かかる炊飯器では感熱素子を取囲むように炊
飯ヒーターが設けられているため感熱素子は炊飯ヒータ
ーの輻射熱の影響を受は易く、又。Problems to be Solved by the Invention However, in such a rice cooker, since the rice cooking heater is provided so as to surround the heat sensitive element, the heat sensitive element is easily affected by the radiant heat of the rice cooking heater.

感熱素子が密着している内鍋底部の温度上昇カープは炊
飯ヒーターの温度上昇カーブによって決まってしまうた
め、炊飯量の多少による炊飯ヒーター。温度上昇カーブ
の差はわずかになってしまい・炊飯量判別精度が低かっ
た。また、炊飯ヒーターの発熱量を増す（炊飯電力を増
加する）と、上記判別精度は更に低くなり、炊飯ヒータ
ーと内鍋の密着度の具合によっても上記炊飯ヒーターの
温度上昇カーブが変るので、正確な炊飯量判別が史に困
難であった。The temperature rise curve at the bottom of the inner pot, where the heat-sensitive element is in close contact, is determined by the temperature rise curve of the rice cooker, so the rice cooker depends on the amount of rice being cooked. The difference in the temperature rise curve was small, and the accuracy of determining the amount of rice cooked was low. In addition, if the heat generation amount of the rice cooking heater is increased (the rice cooking power is increased), the above discrimination accuracy will further decrease, and the temperature rise curve of the rice cooking heater will change depending on the degree of contact between the rice cooking heater and the inner pot, so it will not be accurate. Historically, it has been difficult to determine the amount of rice cooked.

問題点を解決するための手段 本発明は上記の欠点を除くためになされたものであり、
炊飯量の判別精度を向上させた炊飯器を得るＫある。そ
のために、内釜を加熱する炊飯ヒーターと、内釜に熱的
に結合して内釜の温度を検知する温度センサーと、温度
検知手段と、炊飯ヒーターへの通電制御手段とを夫々本
体内部に設け。Means for Solving the Problems The present invention has been made to eliminate the above-mentioned drawbacks.
There is a method for obtaining a rice cooker with improved accuracy in determining the amount of rice to be cooked. For this purpose, a rice cooking heater that heats the inner pot, a temperature sensor that is thermally coupled to the inner pot and detects the temperature of the inner pot, a temperature detection means, and a means for controlling electricity supply to the rice cooking heater are installed inside the main body. Provided.

予め設定した温度を検知するまで炊飯ヒーターへ通電し
、この温度検知後はこれよりやや低い温度を検知するま
で炊飯ヒーターへの通電を遮断し。Power is applied to the rice cooking heater until a preset temperature is detected, and after this temperature is detected, power to the rice cooking heater is cut off until a temperature slightly lower than this is detected.

また、やや低い温度検知後は再度予め設定した温度を検
知するまで炊飯ヒーターへ通電する繰り返しを、炊飯開
始前の予め設定された一定時間内に予熱炊き行程として
設定し、前記両温度検知状況を介して炊飯量を判別する
ようにしたものである。In addition, after a slightly low temperature is detected, the rice cooking heater is repeatedly energized until the preset temperature is detected again, as a preheating process within a preset period of time before starting rice cooking, and both temperature detection situations are The amount of cooked rice is determined through the

作　　用 このようにすることによって炊飯量が少ない場合には予
め設定した温度まで加熱して炊飯ヒーターへの通電を遮
断した後も余熱によって内釜内の米飯が加熱され続け、
予熱炊き行程中には温度センサーがやや低い温度を検知
しない。一方、炊飯量が多い場合には上記同様子め設定
した温度で炊飯ヒーターへの通電を遮断後は、米飯下部
から上部へ熱が伝わるため温度センサーは急激に冷却さ
れてやや低い温度を検知し、再度予め設定した温度まで
加熱される繰り返し通電が予熱炊き行程中に行なわれる
ものである。By doing this, when the amount of rice to be cooked is small, the rice in the inner pot will continue to be heated by the residual heat even after heating to the preset temperature and cutting off the electricity to the rice cooking heater.
During the preheating process, the temperature sensor does not detect slightly low temperatures. On the other hand, when the amount of rice to be cooked is large, after turning off the power to the rice cooking heater at the preset temperature as above, the temperature sensor cools down rapidly and detects a slightly lower temperature because the heat is transferred from the bottom of the cooked rice to the top. During the preheating process, repeated energization is performed to heat the rice to a preset temperature again.

実施例 以下１本発明の一実施例を図面に従って説明する。Example An embodiment of the present invention will be described below with reference to the drawings.

実施例の構成は第１図に示す如くである。図において１
は本体で、内部に設けた内容器１１内に。The configuration of the embodiment is as shown in FIG. In the figure 1
is the main body, and inside the inner container 11 provided inside.

有底筒状にして着脱自在な内釜６を収納したものである
。２は炊飯ヒーターで、中央部に穴５を有する円板状に
して内容器１１内底部に位置してなり。It has a cylindrical shape with a bottom and houses a removable inner pot 6. 2 is a rice cooking heater, which is in the shape of a disc with a hole 5 in the center and is located at the inner bottom of the inner container 11.

内釜３外底部に密着する如く設けてあり、内釜６を加熱
するものである。４は温度センサーで、前記穴５を介し
て内釜６に密着する如く設けてあり。It is provided so as to be in close contact with the outer bottom of the inner pot 3 and heats the inner pot 6. 4 is a temperature sensor, which is provided so as to be in close contact with the inner pot 6 through the hole 5.

内釜乙の底部温度を検知するものであ乞。６は制御部で
２本体１内底部に設けてあり、マイクロコンピュータ（
以下、マイコン）にプログラムされ制御されている前記
温度センサー４を介した温度検知手段、炊飯ヒーター２
への通電制御手段、及び内釜６内の炊飯量を判別するた
め炊飯量判別手段を内蔵し７たものである。７は蓋体で
２本体１に取付けてあり、内釜乙の開口部を覆う開閉自
在なものである。I would like something that detects the temperature at the bottom of the inner pot. 6 is a control unit, which is provided at the bottom of the 2 main body 1, and is equipped with a microcomputer (
Temperature detection means via the temperature sensor 4, which is programmed and controlled by a microcomputer (hereinafter referred to as a microcomputer), and a rice cooking heater 2
The inner pot 6 is equipped with a built-in power supply control means and a rice cooking amount determining means for determining the amount of rice cooked in the inner pot 6. A lid 7 is attached to the main body 1 and can be opened and closed to cover the opening of the inner pot.

以下５本実施例の動作について述べる。The operation of the five embodiments will be described below.

使用者が内釜６内部に米とこれに見合った適量の水を入
れて本体１の内容器１１内に収納し、蓋体７を閉じると
１内釜３と炊飯ヒーター２及び内釜３と温度セ／？−４
は密着状態となる。ここで・炊飯スイッチ（図示せず）
を操作すると、予熱炊き工程が開始される。予熱炊き工
程ではあらかじめマイコンにプログラムされた０Ｎ−Ｏ
ＦＦサイクルによって通電制御手段を介して炊飯ヒータ
ー２に通電する。本実施例では１０秒ＯＮ、　１０　＄
ｏｐＦの０Ｎ−ＯＦＦサイクルを行うことにする。これ
により炊飯ヒーター２の定格消費電力の約５０Ｘでゆっ
くりと内釜３内部の米飯と水を加熱し、あらかじめ設定
した温度Ｔ１を温度センサー４の出力により温度検知手
段で検知するまで加熱を続ける。温度Ｔ１倹九時は内釜
６下部は米飯が糊化を始める温度より低く。When the user puts rice and an appropriate amount of water into the inner pot 6 and stores it in the inner container 11 of the main body 1, and closes the lid 7, the inner pot 1, the rice cooking heater 2, and the inner pot 3 are separated. Temperature/? -4
are in close contact. Here・Rice cooking switch (not shown)
When you operate , the preheating process will start. In the preheating process, 0N-O is programmed into the microcomputer in advance.
The rice cooking heater 2 is energized by the FF cycle via the energization control means. In this example, ON for 10 seconds, 10 $
We will perform an ON-OFF cycle of opF. As a result, the cooked rice and water inside the inner pot 3 are slowly heated at approximately 50X of the rated power consumption of the rice cooking heater 2, and heating is continued until the preset temperature T1 is detected by the temperature detection means based on the output of the temperature sensor 4. When the temperature T1 is 9 o'clock, the temperature at the bottom of the inner pot 6 is lower than the temperature at which cooked rice starts to gelatinize.

かつ、効率よく米が吸水する温度になっているが温度Ｔ
、検知により炊飯ヒーター２への通電が遮断されると内
釜６内部“に満量の米飯と水が入っている場合には第５
図に示す如く内釜６下部より上部へ熱が伝わり、この結
果内釜６下部が冷却され。Moreover, the temperature is such that the rice absorbs water efficiently, but the temperature is T.
When the power to the rice cooking heater 2 is cut off due to detection, if there is a full amount of cooked rice and water in the inner pot 6, the fifth
As shown in the figure, heat is transmitted from the lower part of the inner pot 6 to the upper part, and as a result, the lower part of the inner pot 6 is cooled.

温度センサー４の出力が変化し、温度Ｔ１より低い温度
Ｔ２を温度検知手段で検知し、再び炊飯ヒーター２へＯ
Ｎ・ＯＦＦサイクルで通電を行ない、予熱炊き行程の一
定時間（ここでは通電開始後８分間と従来の倍以上の時
間とする）の量温度Ｔ　２　＋温度Ｔ、の温度範囲内に
なるよう炊飯ヒーター２への通電制御を行なう。ところ
が内釜６内部の米飯と水が少量の場合には第２図に示す
如く温度Ｔｌ検知時、米飯が少量であるため内釜３内の
木版上部と下部の温度差がほとんどなく、伝熱による冷
却がないため温度ＴＩを検知して炊飯ヒーター２への通
電遮断後、予熱炊き行程の時間内に温度Ｔ２を検知する
温度まで内釜乙の温度は下がらない。従って米飯が少量
の時は一度温度Ｔｌが検知された後は古び加熱されるこ
となく１通電開始より８分間が経過し。The output of the temperature sensor 4 changes, the temperature detection means detects a temperature T2 lower than the temperature T1, and the temperature is returned to the rice cooking heater 2.
Electricity is applied in the N/OFF cycle, and the rice is cooked so that the temperature is within the temperature range of amount temperature T 2 + temperature T for a certain period of time during the preheating cooking process (in this case, 8 minutes after the start of electricity application, which is more than double the conventional time). Controls power supply to the heater 2. However, when the amount of cooked rice and water inside the inner pot 6 is small, as shown in Figure 2, when the temperature Tl is detected, there is almost no temperature difference between the top and bottom of the wood block inside the inner pot 3 because the amount of cooked rice is small, and the heat transfer is Since there is no cooling, after temperature TI is detected and electricity is cut off to rice cooking heater 2, the temperature of inner pot O does not fall to the temperature at which temperature T2 is detected within the time of the preheating cooking process. Therefore, when the amount of cooked rice is small, once the temperature Tl is detected, 8 minutes elapse from the start of one energization without being heated.

炊飯行程へ移行する。即ち本発明では温度Ｔｌ検知によ
る炊飯ヒーター２への通電Ｒ断後再加熱が有るか、ない
か、言い換えれば温度Ｔ２が検知されるか、されないか
によって炊飯量の多少を炊飯量判別手段で判別する。こ
の結果により以降の炊飯行程で炊飯電力を変化させるな
どして炊飯量に見合った電力で炊飯し、いかなる炊飯量
でもご飯をおいしく炊き上げることができるものである
。Move on to the rice cooking process. That is, in the present invention, the amount of rice to be cooked is determined by the amount of rice to be cooked by the amount of rice to be cooked depending on whether or not there is reheating after energization R to the rice cooking heater 2 is cut off by temperature Tl detection, in other words, whether or not temperature T2 is detected or not. do. Based on this result, rice can be cooked with electricity commensurate with the amount of rice to be cooked by changing the rice cooking power in the subsequent rice cooking process, and the rice can be cooked deliciously regardless of the amount of rice to be cooked.

発明の効果 以上の如く本発明によると予熱炊き工程中の再加熱の有
無により炊飯量の判別を行なうので・従来の炊飯量判別
手段に比し、正確に判別出来、且つ、従来より長い時間
をかけて判別を行なわせて炊飯ヒーターと、内釜の密着
度が多少変化しても安定した判別結果となる炊飯量の判
別精度の向上した炊飯器を得ることが出来るものである
。Effects of the Invention As described above, according to the present invention, since the amount of cooked rice is determined based on the presence or absence of reheating during the preheating process, the amount of cooked rice can be determined more accurately than the conventional means for determining the amount of cooked rice, and it takes a longer time than before. A rice cooker with improved accuracy in determining the amount of rice to be cooked can be obtained by performing the determination over a period of time and providing a stable determination result even if the degree of contact between the rice cooking heater and the inner pot changes somewhat.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例による炊飯量の判別機能を有
する炊飯器の断面図、第２図（ａ）　、　（ｂ）は同少
量の炊飯量の時の温度センサーの温度特性図及び炊飯ヒ
ーターへの通電状態説明のための特性図。 第６図（ａ）　、　（ｂ）は同満量の炊飯量の時の温度
センサーの温度特性図及び炊飯ヒーターへの通電状態説
明のだめの特性図である。 １・・・本体、　　２・・・炊飯ヒーター、　　６・・
・内釜。 ４・・・温度センサーｒ　　Ｔｌ　＋　Ｔ２・・・温度
。Fig. 1 is a sectional view of a rice cooker having a function of determining the amount of cooked rice according to an embodiment of the present invention, and Figs. 2 (a) and (b) are temperature characteristic diagrams of the temperature sensor when the same amount of rice is being cooked. A characteristic diagram for explaining the energization state to the rice cooking heater. FIGS. 6(a) and 6(b) are temperature characteristic diagrams of the temperature sensor when the same amount of rice is being cooked, and a characteristic diagram for explaining the energization state to the rice cooking heater. 1... Main body, 2... Rice cooking heater, 6...
・Inner pot. 4... Temperature sensor r Tl + T2... Temperature.

Claims (1)

【特許請求の範囲】[Claims] 本体に収納される着脱自在な内釜と、本体に取付けられ
て内釜を加熱する炊飯ヒーターを備えたものにおいて、
内釜（３）の底部と熱的に結合する温度センサー（４）
と、この温度センサー（４）を介して内釜（３）の温度
を検知する温度検知手段と、炊飯ヒーター（２）への通
電を制御する通電制御手段とを夫々本体（１）に設け、
一方、温度（Ｔ＿１）と、この温度（Ｔ＿１）よりやや
低い温度（Ｔ＿２）を予め設定するとともに、炊飯開始
前の予め設定した一定時間内に前記温度（Ｔ＿１）検知
までの炊飯ヒーター（２）への通電と、温度（Ｔ＿１）
検知後やや低い温度（Ｔ＿２）検知までの炊飯ヒーター
（２）の通電の遮断と、やや低い温度（Ｔ＿２）検知後
炊飯ヒーター（２）へ再通電する繰り返し機能よりなる
予熱炊き行程を設定し、かつこの予熱炊き工程中の前記
両温度（Ｔ＿１）、（Ｔ＿２）の検知状態を介した炊飯
ヒーター（２）の遮断あるいは再加熱の有無によって炊
飯量の判別を行なう炊飯量判別手段を設けたことを特徴
とする炊飯量の判別機能を有する炊飯器。For those equipped with a removable inner pot stored in the main body and a rice cooking heater attached to the main body to heat the inner pot,
Temperature sensor (4) thermally coupled to the bottom of the inner pot (3)
and temperature detection means for detecting the temperature of the inner pot (3) via this temperature sensor (4), and energization control means for controlling energization to the rice cooking heater (2), respectively, provided in the main body (1),
On the other hand, a temperature (T_1) and a temperature (T_2) slightly lower than this temperature (T_1) are set in advance, and the rice cooking heater (2) energization and temperature (T_1)
A preheating cooking process is set, which consists of a repeating function of cutting off electricity to the rice cooking heater (2) until a slightly lower temperature (T_2) is detected after detection, and re-energizing the rice cooking heater (2) after detecting a slightly lower temperature (T_2), Further, a rice cooking amount determining means is provided which determines the rice cooking amount based on the presence or absence of shutoff or reheating of the rice cooking heater (2) through the detection states of the two temperatures (T_1) and (T_2) during the preheating cooking process. A rice cooker having a function of determining the amount of cooked rice.