JPS59141910A - Rice cooker - Google Patents
Rice cookerInfo
- Publication number
- JPS59141910A JPS59141910A JP1479683A JP1479683A JPS59141910A JP S59141910 A JPS59141910 A JP S59141910A JP 1479683 A JP1479683 A JP 1479683A JP 1479683 A JP1479683 A JP 1479683A JP S59141910 A JPS59141910 A JP S59141910A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- rice cooking
- sensing element
- temperature sensing
- rice
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Cookers (AREA)
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】
本発明は内釜の温度を検出して炊飯ヒータを制御する炊
飯加熱制御装冒を有する炊飯器において、内釜の温度検
出−を構成する感温素子の断線検出に関するものである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to disconnection detection of a temperature sensing element that constitutes temperature detection of the inner pot in a rice cooker having a rice cooking heating control device that detects the temperature of the inner pot and controls the rice cooking heater. It is something.
従来の感温素子の断線検出は、感温素子を含む分圧抵抗
回路が内釜の温度検出と共通に使用、され、かつ断線検
出レベルを感温素子の断線に相当する極端に大きな抵抗
値に設定して行っていた。しかし、従来の方法によると
、内釜の温度検出と、断線検出との感温素子の設定抵抗
値であまりにも差がありすぎ、また当然のことながら分
圧抵抗回路の安定な検出レベルを内釜の温度検出レベル
に合わせるために、断線の誤検出を生ずるおそれがある
欠点があった。In conventional thermosensor disconnection detection, a voltage dividing resistor circuit including the thermosensor is used in common to detect the temperature of the inner pot, and the disconnection detection level is set to an extremely large resistance value corresponding to a disconnection of the thermosensor. I set it to . However, according to the conventional method, there is too much difference in the set resistance value of the temperature sensing element for detecting the temperature of the inner pot and detecting disconnection. Since the temperature detection level is adjusted to the temperature detection level of the pot, there is a drawback that there is a risk of erroneously detecting a disconnection.
特に寒冷地においては、周囲温度が低いために、感温素
子として負性サーミスタを使用した場合はその抵抗値が
増大するため、この方法では無理があった。Particularly in cold regions, where the ambient temperature is low, if a negative thermistor is used as a temperature sensing element, its resistance value will increase, making this method unreasonable.
本発明は−り記の点に鑑みてなされたもので、内釜の温
度検出響を構成する感温素子の断線検出を、炊飯開始後
、一定時間経過してから感温素子の温度上昇値を検出し
て断線の判定を行うようにする乙とにより、分圧抵抗回
路を内釜の温度検出と断線検出とで共通に使用しても、
断線検出の感温素子の設定抵抗値を小さくでき、分圧抵
抗回路の安定なレベルで検出できるようにして上記従来
の欠点を解消したものである。The present invention has been made in view of the above points, and detects the disconnection of the temperature sensing element that constitutes the temperature detection sound of the inner pot. Even if a voltage divider resistor circuit is used for both inner pot temperature detection and wire breakage detection,
The set resistance value of the temperature sensing element for detecting disconnection can be made small, and detection can be performed at a stable level of the voltage dividing resistor circuit, thereby solving the above-mentioned drawbacks of the conventional technology.
以下に本発明の一実施例について説明する。An embodiment of the present invention will be described below.
第1図はこの発明による炊飯晋の一実施例の全体構成図
である。FIG. 1 is an overall configuration diagram of an embodiment of a rice cooker according to the present invention.
第1図から明らかなように、外釜1と内釜2との間に内
釜2を加熱する炊飯ヒータ3と内釜2の温度を検出する
感温素子4かも成る温度検出I#5を設け、炊飯時間計
測手段6により炊飯開始後、一定時間経過した後に、断
線判定手段7により上記温度検出I#5で検出した検出
レベルと断線レベルとを比較判定し、その結果を炊飯加
熱制御手段8に送り、炊飯ヒータ3を制御するように構
成されている。As is clear from FIG. 1, a temperature detection I#5, which also includes a rice cooking heater 3 for heating the inner pot 2 and a temperature sensing element 4 for detecting the temperature of the inner pot 2, is installed between the outer pot 1 and the inner pot 2. After a certain period of time has elapsed after the start of rice cooking by the rice cooking time measuring means 6, the disconnection determining means 7 compares and determines the detection level detected by the temperature detection I#5 with the disconnection level, and the result is used by the rice cooking heating control means. 8 to control the rice cooking heater 3.
第2図は第1図の実施例に使用される炊飯諸本体の断面
図である。FIG. 2 is a sectional view of the rice cooking bodies used in the embodiment of FIG. 1.
図中、1は外釜で、その中に米と水が入る内釜2が配置
されている。3は内釜2と外釜1との間に配置された炊
飯ヒータで、内釜2の底部に密着されている温度検出N
5を構成する感温素子4により制御される。前記感温素
子4は負性サーミスタで構成されている。In the figure, 1 is an outer pot, and an inner pot 2 containing rice and water is placed inside the outer pot. 3 is a rice cooking heater placed between the inner pot 2 and the outer pot 1, and the temperature detection N is closely attached to the bottom of the inner pot 2.
It is controlled by the temperature sensing element 4 which constitutes 5. The temperature sensing element 4 is composed of a negative thermistor.
第3図は電き接続を示す回路図で、16はA/D変換@
11、メモリ12、CPU13、入力回路14、出力回
路15を内蔵するマイクロコンピュータ、24は抵抗9
と感温素子4とで分圧抵抗回路を示す。Figure 3 is a circuit diagram showing electrical connections, 16 is A/D conversion @
11, a microcomputer with a built-in memory 12, a CPU 13, an input circuit 14, and an output circuit 15; 24, a resistor 9;
and temperature sensing element 4 form a voltage dividing resistor circuit.
炊飯加熱制御手段8は前記マイクロコンピュータ16、
抵抗19、トランジスタ20、抵抗21、双方向性サイ
リスタ22、炊飯ヒータ3から構成される。The rice cooking heating control means 8 includes the microcomputer 16,
It is composed of a resistor 19, a transistor 20, a resistor 21, a bidirectional thyristor 22, and a rice cooking heater 3.
17はマイクロコンピュータ16に内蔵されているA/
D変換@11の入力端子であり、分圧抵抗回路24から
のアナ四グ電位をディジタル値に変換するためにA/D
変換器11に入力する。18は同じく出力回路15の出
力端子を示す。17 is an A/
This is the input terminal of the D conversion@11, and the A/D converter is used to convert the analog voltage potential from the voltage dividing resistor circuit 24 into a digital value.
input to converter 11; Similarly, reference numeral 18 indicates an output terminal of the output circuit 15.
10は炊飯を開始するための炊飯スイッチ、23は商用
周波数電源である。10 is a rice cooking switch for starting rice cooking, and 23 is a commercial frequency power supply.
次に上記実施例の動作を第4図、第5図を参照しながら
説明する。Next, the operation of the above embodiment will be explained with reference to FIGS. 4 and 5.
第4図は炊飯を開始してからの内釜2の底部の温度と時
間との関係を示す線図で、時間T9はあらかじめマイク
ロコンピュータ16のメモリ12に設定しておき、Tb
時間経過した後、内釜2の底部に密着配置した感温素子
4の温度らを検出して断線の判定をする。FIG. 4 is a diagram showing the relationship between the temperature at the bottom of the inner pot 2 and time after starting rice cooking. Time T9 is set in advance in the memory 12 of the microcomputer 16, and
After a period of time has elapsed, the temperature of the temperature sensing element 4 closely disposed at the bottom of the inner pot 2 is detected to determine whether the wire is disconnected.
もし感温素子4が断線していれば、当然時間t)
TpWkには温度rに上昇したことを検出できないので
、断線と判定できる。If the temperature sensing element 4 is disconnected, it is naturally impossible to detect that the temperature has increased to r at time t)TpWk, so it can be determined that the temperature sensor 4 is disconnected.
第5図はマイクロコンピュータ16のメモリ12に記憶
された断線検出プログラムを示すフローチャートである
。FIG. 5 is a flowchart showing a disconnection detection program stored in the memory 12 of the microcomputer 16.
先ず炊飯スイッチ10を押1゛と、25,26のステッ
プにより炊飯ビータ3がON +/て炊飯を開始する。First, when the rice cooking switch 10 is pressed 1, the rice cooking beater 3 is turned on by steps 25 and 26 to start cooking rice.
この過8!1よマイクロコンピュータ16の出力端子1
8がHighになっ゛C抵抗19を介し、トランジスタ
20がONになって抵抗21を介して双方向サイリスタ
22のゲート電流を流し、双方向サイリスタ22をON
にして炊飯ヒータ3をONする。Output terminal 1 of microcomputer 16
8 becomes High, the transistor 20 turns on through the C resistor 19, the gate current of the bidirectional thyristor 22 flows through the resistor 21, and the bidirectional thyristor 22 is turned on.
and turn on the rice cooking heater 3.
ステップ27で炊飯を開始してからの時間がTb時間経
過した場合、ステップ28に進み、温度検出@s5の感
温素子4の断線を検出する。When the time Tb has elapsed since the start of rice cooking in step 27, the process proceeds to step 28, and a disconnection of the temperature sensing element 4 of the temperature detection @s5 is detected.
A/D変換l#11の入力端子17で測定される検出レ
ベルVDは次式で現される。The detection level VD measured at the input terminal 17 of the A/D converter l#11 is expressed by the following equation.
R+Rrイ
ととで、R2陥はそれぞれ抵抗9感渇素子4の抵抗値で
あり、Vssは制御回路の電源電圧である。In R+Rr, R2 is the resistance value of the resistor 9 and the thirst sensing element 4, and Vss is the power supply voltage of the control circuit.
また断線レベル−は、炊飯を開始してから1時間経過し
た後、感温素子4が正常な場合に感温素子・4部の温度
上昇値tりになった時の感温素子4の抵抗値RTI−I
をfa)式で計算した値であり、あらかじめマイクロコ
ンピュータ16のメモリ12に記憶されている。In addition, the disconnection level is the resistance of the temperature sensing element 4 when the temperature of the temperature sensing element 4 reaches the temperature rise value t when the temperature sensing element 4 is normal after one hour has passed from the start of rice cooking. Value RTI-I
is a value calculated using the formula (fa), and is stored in advance in the memory 12 of the microcomputer 16.
従って■は次式で現される値である。Therefore, ■ is a value expressed by the following equation.
R十Rn1
そこで、vj)Veの場合は断線と判定してステップ2
9.30に進み、ステップ29では炊飯ヒータ3をOF
Fにして炊飯を停止する。R0Rn1 Therefore, in the case of vj)Ve, it is determined that the wire is broken and step 2
Proceed to 9.30 and turn off rice cooking heater 3 in step 29.
Turn to F and stop cooking.
この過程はマイクロコンピュータ16の出力端子18が
OFFになってトランジスタ20をOFFにし、双方向
サイリスタ22のゲート電流を遮断して双方向サイリス
タ22をOFFにし、炊飯ヒータ3をQFFにする。In this process, the output terminal 18 of the microcomputer 16 is turned OFF, turning off the transistor 20, cutting off the gate current of the bidirectional thyristor 22, turning the bidirectional thyristor 22 OFF, and setting the rice cooking heater 3 to QFF.
さらにステップ30では安全のために装置の全機能を浮
止、たとえば炊飯表示ランプが点灯している場合は消灯
するなどの処置を施すなどして異常を知ら17める。Further, in step 30, for safety, all functions of the device are disabled, for example, if the rice cooking indicator lamp is on, it is turned off, etc., to notify the user of any abnormality.
■〈)んの場きは、感温素子4が正常であると判定して
ステップ31に進み、感温素子゛4部の温度が炊飯完了
時の完了レベル■になったかどうかを断線判定時と同様
にA/D変換器110入力端子17で測定される検出レ
ベルvs′と比較して判定する。■ If <), it is determined that the temperature sensing element 4 is normal and the process proceeds to step 31, and when determining whether the temperature of the temperature sensing element 4 has reached the completion level ■ when rice cooking is completed. Similarly, the determination is made by comparing with the detection level vs' measured at the input terminal 17 of the A/D converter 110.
Vs’ > vsの場合は、再度ステップ31の判定を
行い、W(V3の場合には炊飯を完了したと判定し、炊
飯ヒータ3をOFFにするのである。In the case of Vs'>vs, the determination in step 31 is made again, and in the case of W(V3), it is determined that the rice cooking is completed and the rice cooking heater 3 is turned off.
以上のようにこの発明によれば、内釜の温度検出譬を構
成する感温素子の断線検出を炊飯開始後、一定時間が経
過してから感温素子の温度上昇値を検出して断線の判定
を行うようにしたので、断線検出時の感温素子の設定抵
抗値を小さくでき、分圧抵抗回路の安定なレベルで検出
できることによって、感温素子の断線検出を確実に行え
ると同時に、炊飯完了時の温度検出をも確実に行うこと
ができるものである。As described above, according to the present invention, the temperature rise value of the temperature sensing element is detected after a certain period of time has passed after the start of cooking to detect the disconnection of the temperature sensing element that constitutes the temperature detection of the inner pot. Since the determination is made, it is possible to reduce the set resistance value of the thermosensing element when detecting a disconnection, and by detecting at a stable level of the voltage dividing resistor circuit, it is possible to reliably detect a disconnection of the thermosensor, and at the same time, it is possible to It is also possible to reliably detect the temperature upon completion.
第1図はこの発明による炊飯譬の一実施例の全体構成図
、第2図はその炊飯筒本体の断面図、第3図はその電気
接続を示す回路図、第4図は炊飯開始後の感温素子の温
度と時間の関係を示す線図、第5図は本実施例の動作を
示す)o −チャートである。
図中、2は内釜、3は炊飯ヒータ、4は感温素子、5は
温度検出響、6は炊飯時間計測手段、7は断線判定手段
、8は炊飯加熱制卸手段である。
代理人 菖 舒 信 −(外1名)
牙1図
第2図
特開昭59−141910(4)
第4図
第5図
スタート
No ! 25
1
ヵ□−7゜N26
No 27
丁
、28
Vb>V。
No−Or−F−29
o31
YES 儲昧ムのFig. 1 is an overall configuration diagram of an embodiment of the rice cooking example according to the present invention, Fig. 2 is a sectional view of the rice cooking cylinder main body, Fig. 3 is a circuit diagram showing its electrical connection, and Fig. 4 is a diagram after the rice cooking starts. A diagram showing the relationship between the temperature of the temperature sensing element and time, FIG. 5 is an o-chart showing the operation of this embodiment. In the figure, 2 is an inner pot, 3 is a rice cooking heater, 4 is a temperature sensing element, 5 is a temperature detection sensor, 6 is a rice cooking time measuring means, 7 is a disconnection determining means, and 8 is a rice cooking heating control means. Agent Shu Shin - (1 other person) Fang 1 Figure 2 JP-A-59-141910 (4) Figure 4 Figure 5 Start No.! 25 1 □-7°N26 No 27 28 Vb>V. No-Or-F-29 o31 YES
Claims (1)
潤度検出器、この温度検出璧の検出信号によって前記炊
飯ヒータを制御する炊飯加熱制卸手段を備えた炊飯器に
おいて、前記温度検出晋を構成する感温素子の断線検出
を、炊飯開始後、一定時間経過してから前記感温素子の
温度上昇値を検出する乙とによって行うことを特徴とす
る炊飯器。In the rice cooker, the rice cooker includes a rice cooking heater that heats an inner pot, a moisture detector that detects the temperature of the inner pot, and a rice cooking heating control means that controls the rice cooking heater based on a detection signal from the temperature detection plate. A rice cooker characterized in that disconnection of a temperature sensing element constituting the rice cooker is detected by detecting a temperature rise value of the temperature sensing element after a certain period of time has elapsed after the start of rice cooking.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1479683A JPS59141910A (en) | 1983-02-01 | 1983-02-01 | Rice cooker |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1479683A JPS59141910A (en) | 1983-02-01 | 1983-02-01 | Rice cooker |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59141910A true JPS59141910A (en) | 1984-08-14 |
Family
ID=11871012
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1479683A Pending JPS59141910A (en) | 1983-02-01 | 1983-02-01 | Rice cooker |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59141910A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0810159A (en) * | 1994-06-30 | 1996-01-16 | Tiger Vacuum Bottle Co Ltd | Abnormality detector for rice cooker |
JP2010057820A (en) * | 2008-09-05 | 2010-03-18 | Paloma Ind Ltd | Rice cooker |
JP2010057821A (en) * | 2008-09-05 | 2010-03-18 | Paloma Ind Ltd | Rice cooker |
-
1983
- 1983-02-01 JP JP1479683A patent/JPS59141910A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0810159A (en) * | 1994-06-30 | 1996-01-16 | Tiger Vacuum Bottle Co Ltd | Abnormality detector for rice cooker |
JP2010057820A (en) * | 2008-09-05 | 2010-03-18 | Paloma Ind Ltd | Rice cooker |
JP2010057821A (en) * | 2008-09-05 | 2010-03-18 | Paloma Ind Ltd | Rice cooker |
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