JP4823152B2

JP4823152B2 - Cooker

Info

Publication number: JP4823152B2
Application number: JP2007150551A
Authority: JP
Inventors: 宏中村
Original assignee: Mitsubishi Electric Home Appliance Co Ltd; Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Home Appliance Co Ltd; Mitsubishi Electric Corp
Priority date: 2007-06-06
Filing date: 2007-06-06
Publication date: 2011-11-24
Anticipated expiration: 2027-06-06
Also published as: JP2008305632A

Description

本発明は加熱調理器、特に、電磁誘導加熱源により調理を行う加熱調理器に関するものである。 The present invention relates to a cooking device, and more particularly to a cooking device that performs cooking with an electromagnetic induction heating source.

従来の加熱調理器は、図１０に示されるように構成されている。すなわち１０は本体で、上部には鍋などの調理器具を載せるプレート３を有している。プレート３の下部には電磁誘導加熱方式による加熱コイル６と、鍋１の温度を検出するサーミスタ等の温度検出素子４とを備えている。 The conventional cooking device is configured as shown in FIG. That is, 10 is a main body, and has a plate 3 on which a cooking utensil such as a pan is placed. The lower part of the plate 3 is provided with a heating coil 6 by an electromagnetic induction heating method and a temperature detection element 4 such as a thermistor for detecting the temperature of the pan 1.

８は加熱コイル６を制御する制御手段、１１は時間を計測する計時手段であり、温度検出素子４による温度と計時手段１１による時間は、前記制御手段８に送られ、この信号によって加熱コイル６が制御される。さらに、本体１０には異常加熱防止手段１２を備えている。異常加熱防止手段１２は温度検出素子４による温度と計時手段１１による時間より求めた傾きｔから、異常加熱を防止するためのパワーダウン温度Ｔを決定し、温度検出素子４の温度がパワーダウン温度Ｔになると制御手段８にパワーダウン命令を送るものである。 8 is a control means for controlling the heating coil 6, and 11 is a time measuring means for measuring time. The temperature by the temperature detecting element 4 and the time by the time measuring means 11 are sent to the control means 8, and the heating coil 6 is received by this signal. Is controlled. Further, the main body 10 is provided with an abnormal heating preventing means 12. The abnormal heating preventing means 12 determines a power down temperature T for preventing abnormal heating from the gradient t obtained from the temperature by the temperature detecting element 4 and the time by the time measuring means 11, and the temperature of the temperature detecting element 4 is the power down temperature. When T is reached, a power down command is sent to the control means 8.

異常加熱防止手段１２は、温度検出素子４による温度と計時手段１１による時間より、温度上昇の傾きｔを求め、この温度上昇の傾きに応じて異常加熱を防止するためのパワーダウン温度Ｔを決定し、温度検出素子４の温度がパワーダウン温度Ｔになると加熱コイル６からの加熱量を低減させる。前記温度上昇の傾きは、鍋内の油の量が温度検出素子４の温度変化に影響しない温度領域（加熱開始初期段階の比較的温度が低い領域）で検出し、温度上昇の傾きｔがゆるやかであるほどパワーダウン温度Ｔを低くすることで底に反りのある鍋の油の異常加熱を防止するものである。さらに温度検出素子４の検出値の傾きから異常加熱防止手段１２が、鍋内の油の量が温度検出素子４の温度変化に影響を与える（比較的高い温度、例えば１３０℃〜１５０℃の）温度領域で温度上昇の傾きｔを求め、このｔが長いほど（緩やかであるほど）パワーダウン温度Ｔを高くすることで、底に反りのない鍋の油の異常加熱を防止することが行われている（特許文献１参照）。 The abnormal heating preventing means 12 obtains a temperature rise gradient t from the temperature by the temperature detecting element 4 and the time by the time measuring means 11, and determines a power down temperature T for preventing abnormal heating according to the temperature rise slope. When the temperature of the temperature detecting element 4 reaches the power down temperature T, the amount of heating from the heating coil 6 is reduced. The inclination of the temperature rise is detected in a temperature region where the amount of oil in the pan does not affect the temperature change of the temperature detection element 4 (region where the temperature is relatively low in the initial stage of heating), and the inclination t of the temperature rise is gentle. The lower the power down temperature T is, the more abnormal heat of the oil in the pan with warping is prevented. Furthermore, the abnormal heating preventing means 12 has an influence on the temperature change of the temperature detecting element 4 (relatively high temperature, for example, 130 ° C. to 150 ° C.) due to the inclination of the detected value of the temperature detecting element 4. The temperature rise slope t is obtained in the temperature region, and the longer this t is (the gentler it is), the higher the power down temperature T is, so that abnormal heating of the oil in the pan without warping is performed. (See Patent Document 1).

特許第３０７０２８９号公報Japanese Patent No. 3070289

従来の加熱調理器においては、温度上昇の傾きｔは、鍋内の油の量が温度検出素子４の温度変化に影響しない温度領域つまり低い温度領域で検出し、温度上昇の傾きｔがゆるやかである。つまり鍋底の反り量が大きい時ほど温度上昇の傾きｔがゆるやかになるわけであるが、そのときほどパワーダウン温度Ｔを低くすることで底に反りのある鍋の油の異常加熱を防止するものである。しかしながら、このような制御方法では、パワーダウン温度Ｔを変更するのみなので加熱電力Ｗは変更しないため、例えば少量の油などを加熱した場合、パワーダウン温度Ｔでパワーをダウンしたとしても油の温度のオーバーシュートが大きくなってしまうという問題点があった。 In the conventional cooking device, the temperature rise slope t is detected in a temperature range where the amount of oil in the pan does not affect the temperature change of the temperature detection element 4, that is, a low temperature range, and the temperature rise slope t is gentle. is there. In other words, the greater the amount of warp at the bottom of the pan, the gentler the rise in temperature t, but the lower the power-down temperature T, the more abnormal heating of the oil in the pan at the bottom is warped. It is. However, in such a control method, since the power-down temperature T is only changed, the heating power W is not changed. For example, when a small amount of oil is heated, even if the power is reduced at the power-down temperature T, the oil temperature There was a problem that the overshoot of was increased.

また、反り量が大きい鍋の場合、鍋内の油の温度上昇が温度検出素子４に伝わりにくくなるため、油の温度上昇の傾きは大きい場合であっても温度検出素子４の温度上昇の傾きは小さく、ゆるやかになってしまう。このため、この温度上昇の傾きを見て、傾きが大きいから反りが小さいと単純に判断処理するのは誤りとなる場合が起こる。その結果、鍋内の油の量が温度検出素子４の温度変化に影響を与える温度領域（たとえば１３０℃〜１５０℃）では、パワーダウン温度Ｔ決定のために求めようとする温度上昇の傾きｔが正確に検出できない。すなわち鍋の反りの大小によっては、温度上昇の傾きを検出することだけでは、油量の検出が正確に行えないという難しい課題があった。 In addition, in the case of a pan with a large amount of warping, the temperature rise of the oil in the pan becomes difficult to be transmitted to the temperature detection element 4, so even if the slope of the oil temperature rise is large, the temperature rise of the temperature detection element 4 Are small and tender. For this reason, when the inclination of the temperature rise is seen, if the inclination is large and the warp is small, it may be erroneous to simply perform the determination process. As a result, in a temperature range (for example, 130 ° C. to 150 ° C.) where the amount of oil in the pan affects the temperature change of the temperature detecting element 4, the temperature rise slope t to be obtained for determining the power down temperature T. Cannot be detected accurately. That is, depending on the size of the warp of the pan, there is a difficult problem that the amount of oil cannot be detected accurately only by detecting the inclination of the temperature rise.

本発明は、上記のような課題を解決するためになされたものであり、鍋底に反りがあることによって発生する鍋内の油の温度上昇の傾きと、温度検出素子の温度上昇の傾きの差を小さくすることを可能としたものである。このことにより、油量をより正確に検出し、検出された油量にもとづき、鍋底の反り量と油量に応じた加熱通電率にして、油量が少ない時でも油温度のオーバーシュートを小さくする加熱調理器を提供することを目的とする。 The present invention has been made in order to solve the above-described problems, and the difference between the temperature rise gradient of the oil in the pan and the temperature rise gradient of the temperature detection element caused by warping of the pan bottom. Can be made smaller. This makes it possible to detect the oil amount more accurately, and based on the detected oil amount, make the heating energization rate according to the warp amount and oil amount of the pan bottom, and reduce the oil temperature overshoot even when the oil amount is small. An object of the present invention is to provide a heating cooker.

本発明に係る加熱調理器は、
加熱コイルと、
この加熱コイルを制御する制御手段と、
鍋を載せるプレートと、
前記プレートの下面に設けられ、前記プレート下面の温度を検出することにより前記鍋の温度を検出し前記制御手段に信号を送る温度検出素子と、
時間を計測し前記制御手段に信号を送る計時手段と、
を備え、
前記制御手段には、前記温度検出素子の検出値の傾きから底に反りのある鍋の油の異常加熱を防止するべく制御する第一の制御手段を備え、
この第一の制御手段は、前記温度検出素子による温度と前記計時手段による時間より温度上昇の傾きｔを求め、この温度上昇の傾きに応じて前記加熱コイルの加熱通電率を変更させるとともに、
前記温度上昇の傾きｔは、前記鍋内の油の量が前記温度検出素子の温度変化に影響しない温度領域である加熱開始初期段階の温度が低い第１の温度領域で求め、
前記制御手段には、前記温度検出素子の検出値の傾きから底に反りのある鍋の油の異常加熱を防止するべく制御する第二の制御手段を備え、
この第二の制御手段は、前記温度検出素子による温度と前記計時手段による時間より温度上昇の傾きｔｔを求め、この温度上昇の傾きに応じて前記加熱コイルの加熱通電率を変更させるとともに、前記鍋内の油の量が前記温度検出素子の温度変化に影響を与える温度領域である前記第１の温度領域よりも温度の高い第２の温度領域で前記傾きｔｔを求め、
前記第一の制御手段は、前記傾きｔがゆるやかであるほど前記加熱コイルの加熱通電率が小さくなるように前記第２の温度領域及び前記第２の温度領域よりも温度の高い第３の温度領域において制御し、
前記第二の制御手段は、前記傾きｔｔがゆるやかであるほど前記加熱コイルの加熱通電率を大きくするように前記第３の温度領域において制御動作を行なう
ことを特徴とする。 The heating cooker according to the present invention is
A heating coil;
Control means for controlling the heating coil;
A plate on which to put the pot,
A temperature detecting element for sending a signal to the control means detects the temperature of the pan by provided on the lower surface of the plate, for detecting a temperature of the plate lower surface,
Timing means for sending a signal to the control means measures the time,
With
Wherein the control means comprises a first control means for controlling so as to prevent abnormal heating of the oil from the slope of the detection value of the pot is warped on the bottom of said temperature detecting element,
The first control means determines the slope t of the temperature rise than the time according to the temperature and the time measuring means by the temperature detection element, together with changing the heat conduction rate of the heating coil in accordance with the inclination of the temperature rise,
The temperature rise slope t is determined in the first temperature range where the temperature at the initial stage of heating is low, which is the temperature range where the amount of oil in the pan does not affect the temperature change of the temperature detection element ,
The control means comprises a second control means for controlling to prevent abnormal heating of the oil in the pan warped from the inclination of the detection value of the temperature detection element,
The second control means obtains a temperature rise slope tt from the temperature by the temperature detecting element and the time by the time measuring means, and changes the heating energization rate of the heating coil in accordance with the temperature rise slope. Obtaining the slope tt in a second temperature region having a temperature higher than the first temperature region, which is a temperature region in which the amount of oil in the pan affects the temperature change of the temperature detection element;
The first control means includes a third temperature that is higher than the second temperature range and the second temperature range so that the heating energization rate of the heating coil becomes smaller as the inclination t is gentler. Control in the area ,
The second control means performs a control operation in the third temperature range so that the heating current rate of the heating coil is increased as the inclination tt is gentler .

本発明は以上の構成であるから、鍋に入っている油量をより正確に検出し、検出された油量に基づき、鍋底の反り量と油量に応じた加熱通電率にして、油量が少ない時でも油温度のオーバーシュートを小さくすることができる。 Since the present invention is configured as described above, the amount of oil contained in the pan is more accurately detected, and based on the detected amount of oil, the heating current rate according to the amount of warpage of the pan and the amount of oil is set. Even when there is a small amount of oil, the oil temperature overshoot can be reduced.

［実施の形態１］
図１〜図９は、本発明の実施の形態１に係る加熱調理器を示すものであって、図１は加熱調理器の使用状態における全体構成図、図２は全体の制御動作を示すフォローチャート、図３は検出温度と加熱通電率の関係を示す説明図、図４は制御温度の定義を表で示した図、図５は鍋の反りの大きさを判定する場合の反りレベル判定表、図６は鍋の反り量と加熱通電率の相関関係を示す表、図７は温度上昇値と鍋の油量の対応関係を示す表、図８は鍋の反り量と油量の大きさに対応した加熱通電率一覧表、図９は予熱終了温度Ｔ５の補正値の表である。なお、各図において同じ部分または相当する部分には同じ符号を付し、一部の説明を省略する。 [Embodiment 1]
FIGS. 1-9 shows the cooking-by-heating machine which concerns on Embodiment 1 of this invention, Comprising: FIG. 1 is the whole block diagram in the use condition of a cooking-by-heating machine, FIG. 2 is the follow which shows the whole control operation | movement. FIG. 3 is an explanatory diagram showing the relationship between the detected temperature and the heating energization rate, FIG. 4 is a table showing the definition of the control temperature, and FIG. 5 is a warpage level determination table for determining the magnitude of the pan warpage. 6 is a table showing the correlation between the amount of warpage of the pan and the heating current rate, FIG. 7 is a table showing the correspondence between the temperature rise value and the amount of oil in the pan, and FIG. 8 is the magnitude of the amount of warpage of the pan and the amount of oil. FIG. 9 is a table of correction values for the preheating end temperature T5. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and a part of the description is omitted.

以下、本発明の実施の形態１について図1〜図９に基づいて説明する。図１は本発明の一実施例における加熱調理器のブロック図で、１は金属製の鍋、２は鍋１内に入っている食用油、３は耐熱ガラス等から形成された平板状のプレート、４はサーミスタ等の温度検出素子（Ａ）、５は同じく温度検出素子（Ｂ）で、これら二つの温度検出素子はプレート３の下面に密着するように設置され、プレート３を介して鍋１の温度を感知するようになっている。６は電磁誘導加熱（ＩＨ）方式の加熱源となる加熱コイルで、加熱効率向上の面から前記鍋１に出来るだけ接近するようプレート３の下面に密着又は接近した位置に配置されている。７は温度検出手段で、前記温度検出素子（Ａ）（Ｂ）４、５からの温度検出信号を受け取り、鍋１の温度を判定する。８はマイクロコンピュータ等のような演算及び記憶手段を主体に構成された制御手段、９はインバーター回路、１３は時間を計測する計時手段である。 The first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of a cooking device according to an embodiment of the present invention, wherein 1 is a metal pan, 2 is cooking oil contained in the pan 1, and 3 is a flat plate formed from heat-resistant glass or the like. Reference numeral 4 denotes a temperature detection element (A) such as a thermistor, and 5 denotes a temperature detection element (B). These two temperature detection elements are installed in close contact with the lower surface of the plate 3. It is designed to sense the temperature. A heating coil 6 serving as a heating source of an electromagnetic induction heating (IH) system is disposed at a position in close contact with or close to the lower surface of the plate 3 so as to be as close as possible to the pan 1 from the aspect of improving heating efficiency. Reference numeral 7 denotes temperature detection means for receiving temperature detection signals from the temperature detection elements (A) and (B) 4 and 5 and determining the temperature of the pan 1. Reference numeral 8 denotes control means mainly composed of calculation and storage means such as a microcomputer, 9 denotes an inverter circuit, and 13 denotes time measuring means for measuring time.

以上の構成において本発明の調理器の動作について説明する。図２は制御動作の概要を示すフローチャートである。まず使用者は油２が入れられた鍋１をプレート３上の所定の位置に置き、図示しないコントロールパネル上の揚げ物スタートキーをＯＮする（ステップＳ１。以下「ステップ」の記載は省略してＳ１、Ｓ２のように示す）。 The operation of the cooking device of the present invention in the above configuration will be described. FIG. 2 is a flowchart showing an outline of the control operation. First, the user places the pan 1 filled with the oil 2 at a predetermined position on the plate 3 and turns on a fried food start key on a control panel (not shown) (step S1, hereinafter “step” is omitted and S1 is omitted). , Shown as S2).

次に制御手段８がインバーター回路９を駆動させ、加熱コイル６に高周波電流を流すことにより加熱コイル６に通電を開始する（Ｓ２）。本実施例では例えば１ＫＷの加熱電力が投入される。なお制御手段８は、以下述べる各ステップ（Ｓ３〜Ｓ１５）を実行するものである。 Next, the control means 8 drives the inverter circuit 9, and starts energization to the heating coil 6 by flowing a high frequency current through the heating coil 6 (S2). In this embodiment, for example, 1 KW of heating power is input. The control means 8 executes the steps (S3 to S15) described below.

温度検出素子（Ａ）４又は温度検出素子（Ｂ）５のうち、高い温度を検出している方の検出温度＝Thにてスタート時の温度T0を検知する（Ｓ３）。なお、以下の説明では温度検出素子（Ａ）４の方が高い温度を検出したものとして説明する。 Of the temperature detection element (A) 4 or the temperature detection element (B) 5, the temperature T0 at the start is detected at the detection temperature = Th of the one detecting the higher temperature (S3). In the following description, it is assumed that the temperature detection element (A) 4 has detected a higher temperature.

検出温度ThがT1＝T0＋8℃以上になったかどうかを判断し、以上になった場合はＳ５に進む。Ｓ５ではT0からT1までにかかった時間Δtm1を検知する。例えば室温２０℃で加熱開始された場合は検出温度が２８度になるまでに要した時間を検知する。この時間は計時手段１３によって測定され、その結果が制御手段８に送られる。 It is determined whether or not the detected temperature Th is equal to or higher than T1 = T0 + 8 ° C., and if it is higher, the process proceeds to S5. In S5, the time Δtm1 from T0 to T1 is detected. For example, when heating is started at a room temperature of 20 ° C., the time required until the detected temperature reaches 28 degrees is detected. This time is measured by the time measuring means 13 and the result is sent to the control means 8.

次に検出温度ThがT2＝T0＋45℃以上になったかどうかが判断（Ｓ６）され、T1からT2までにかかった時間Δtm2を検知する（Ｓ７）。 Next, it is determined whether or not the detected temperature Th is equal to or higher than T2 = T0 + 45 ° C. (S6), and a time Δtm2 from T1 to T2 is detected (S7).

次にΔＴ＝Δtm2／Δtm1を計算し、図５に示す反りレベル判定表に基づいて反り量を検知する（Ｓ８）。図５に示すように反りの少ない鍋（使用に最適の鍋）の場合はΔＴは小さくなるが、反りの大きい鍋の場合、鍋底がプレート３によく接触しないために熱が温度検出素子（Ａ）４に伝わらず、その結果Δtm2の時間が長くなる為にΔＴは大きくなる。これによって反り量が判定できるものである。 Next, ΔT = Δtm2 / Δtm1 is calculated, and the amount of warpage is detected based on the warpage level determination table shown in FIG. 5 (S8). As shown in FIG. 5, ΔT is small in the case of a pan with little warpage (a pan that is optimal for use), but in the case of a pan with a large warp, since the pan bottom does not come into good contact with the plate 3, the heat is detected by the temperature detection element (A ) As a result, the time Δtm2 becomes longer and ΔT becomes larger. Thus, the amount of warpage can be determined.

次にＳ８で検出した反り量に基づき、図６に示すように反り量に対応した加熱通電率の表による加熱通電率Ａに加熱コイル６の加熱条件を変更する（Ｓ９）。図６の反り量に対応した加熱通電率の表では、反りレベルはＳＳ１（反り量０ｍｍ〜０．５ｍｍ）からＳＳ７（３．０ｍｍ〜）と判定されるようになっており、例えば図２のフローチャートＳ８において反りレベルがＳ１（反り量０ｍｍ〜０．５ｍｍ）と判定された場合、加熱通電率Ａは１４秒間ＯＮ、１秒間ＯＦＦというパターンになる。 Next, based on the warpage amount detected in S8, the heating condition of the heating coil 6 is changed to the heating current rate A based on the heating current rate table corresponding to the warpage amount as shown in FIG. 6 (S9). In the heating energization rate table corresponding to the warpage amount in FIG. 6, the warpage level is determined from SS1 (warpage amount 0 mm to 0.5 mm) to SS7 (3.0 mm˜). When it is determined in the flowchart S8 that the warpage level is S1 (the warp amount is 0 mm to 0.5 mm), the heating energization rate A has a pattern of ON for 14 seconds and OFF for 1 second.

次に温度検出素子４の検出温度ＴｈがＴｈ≧Ｔ３（Ｔ３＝Ｔ０＋８５℃）であるかどうかを判断し（Ｓ１０）、ＹＥＳであれば次のステップ（Ｓ１１）に進む。 Next, it is determined whether the detected temperature Th of the temperature detecting element 4 is Th ≧ T3 (T3 = T0 + 85 ° C.) (S10). If YES, the process proceeds to the next step (S11).

次のステップでは、検出温度Ｔｈ≧Ｔ３を検出してからＢ秒間（例えば９０秒間）の上昇温度ｔｔを検知する（Ｓ１１）。検出温度Ｔｈ≧Ｔ３という温度領域になると鍋１内の油２の量に応じて上昇温度ｔｔが変わり、油２の量が少ない場合は上昇温度ｔｔは大きくなり、油２の量が多い場合は上昇温度ｔｔは小さくなるため、この現象を利用して図７の油量レベル判定の表に基づき油量が検知される（Ｓ１１）。 In the next step, the temperature rise tt for B seconds (for example, 90 seconds) is detected after detecting the detected temperature Th ≧ T3 (S11). In the temperature range of the detected temperature Th ≧ T3, the rising temperature tt changes according to the amount of oil 2 in the pan 1. When the amount of oil 2 is small, the rising temperature tt becomes large, and when the amount of oil 2 is large Since the rising temperature tt becomes small, the oil amount is detected based on the oil amount level determination table of FIG. 7 using this phenomenon (S11).

図７の油量レベル判定の表で油量がＬ１（８００ｇ〜）からＬ５（〜２００ｇ）と判定された後、検出温度ＴｈがＴｈ≧Ｔ４（Ｔ４＝Ｔ０＋１４５℃）となったかどうかを判定する（Ｓ１２）。もしＹＥＳの場合は次のステップ（Ｓ１３）に進み、図８に示すように反り量と油量に対応した加熱通電率の表に基づいた加熱通電率Ｃに変更される。例えば判定された反りレベルがＳＳ１（反り量０ｍｍ〜０．５ｍｍ）で油量レベルがＬ１（８００ｇ〜）の場合は、加熱通電率Ｃは２９秒間ＯＮ、１秒間ＯＦＦとなるようなパターンになる。 After the oil amount is determined from L1 (800 g˜) to L5 (˜200 g) in the oil amount level determination table of FIG. (S12). If YES, the process proceeds to the next step (S13) and is changed to the heating energization rate C based on the heating energization rate table corresponding to the warpage amount and the oil amount as shown in FIG. For example, when the determined warp level is SS1 (warp amount 0 mm to 0.5 mm) and the oil amount level is L1 (800 g to), the heating energization rate C is 29 seconds ON and 1 second OFF. .

この制御により鍋１の底の反り量が大きくかつ油量が少ない場合は、加熱通電率Ｃは小さく制御され、油２の温度上昇に対し、温度検出素子４の検出温度Ｔｈが大きく狂うことなく制御できるとともに、油２の温度のオーバーシュートを小さくすることができる。 When the amount of warp at the bottom of the pan 1 is large and the amount of oil is small by this control, the heating energization rate C is controlled to be small, and the detected temperature Th of the temperature detecting element 4 does not greatly deviate with respect to the temperature rise of the oil 2. While being controllable, the overshoot of the temperature of the oil 2 can be reduced.

また、鍋１の底の反り量が小さくかつ油量が多い場合は、加熱通電率Ｃは大きくなるように制御され、予熱工程の加熱時間が長くなることなく所定の温度にするように制御できるものである。 In addition, when the amount of warp at the bottom of the pan 1 is small and the amount of oil is large, the heating energization rate C is controlled to be large and can be controlled to a predetermined temperature without increasing the heating time in the preheating step. Is.

検出温度ＴｈがＴｈ≧Ｔ５（Ｔ５：予熱終了温度）となったかどうかを判定し（Ｓ１４）、ＹＥＳの場合は次のステップ（Ｓ１５）に進み、加熱をＯＦＦし予熱工程を終了する。 It is determined whether or not the detected temperature Th is Th ≧ T5 (T5: preheating end temperature) (S14). If YES, the process proceeds to the next step (S15), heating is turned off, and the preheating process is terminated.

予熱終了温度Ｔ５は図９に示す予熱終了温度の補正値表に基づいた値分の補正を行ったものになる。例えば油量レベルがＬ１（８００ｇ超）の場合は補正値は０℃となり、油量レベルがＬ５の場合は−８０℃の補正が行われる。例えば１８０℃設定の場合予熱終了温度は２３０℃と設定され、それに対し例えば油量レベルがＬ５となった場合は予熱終了温度Ｔ５＝２３０℃−８０℃＝１５０℃ となる。 The preheating end temperature T5 is obtained by correcting the value based on the preheating end temperature correction value table shown in FIG. For example, when the oil amount level is L1 (over 800 g), the correction value is 0 ° C., and when the oil amount level is L5, correction of −80 ° C. is performed. For example, in the case of 180 ° C. setting, the preheating end temperature is set to 230 ° C., whereas when the oil amount level becomes L5, for example, the preheating end temperature T5 = 230 ° C.−80 ° C. = 150 ° C.

図３は以上のような温度検出素子４の温度上昇カーブおよび、加熱コイル６に対する通電率の推移を示すグラフである。鍋内の油の量が温度検出素子４の温度変化に影響しない温度領域つまり低い温度領域とは、図３で温度Ｔ２以下を言い、Ｔ０が２０℃であった場合はＴ１は２８℃、Ｔ２はＴ０より更に４５℃高い６５℃である。 FIG. 3 is a graph showing the temperature rise curve of the temperature detecting element 4 as described above and the transition of the energization rate for the heating coil 6. The temperature range in which the amount of oil in the pan does not affect the temperature change of the temperature detecting element 4, that is, the low temperature range means the temperature T2 or lower in FIG. 3, and when T0 is 20 ° C., T1 is 28 ° C., T2 Is 65 ° C., 45 ° C. higher than T0.

鍋内の油の量が温度検出素子Ａ（４）、Ｂ（５）の温度変化に影響を与える温度領域とは、図３において温度Ｔ３（Ｔ０が２０℃であるとすると１０５℃になる）を超えた範囲を言う。 The temperature range in which the amount of oil in the pan affects the temperature change of the temperature detection elements A (4) and B (5) is the temperature T3 in FIG. 3 (if T0 is 20 ° C., it becomes 105 ° C.) The range beyond.

以上の説明から明らかなように、本発明の実施の形態１によれば、鍋１内の油２の量が温度検出素子４の温度変化に影響しない温度領域、つまり低い温度領域で温度上昇の傾きｔを検出し、温度上昇の傾きｔがゆるやかである場合、つまり鍋１の底の反り量が大きい時ほど加熱通電率を小さくし、鍋１の底に反りがあることによって発生する鍋１内の油２の温度上昇の傾きと、温度検出素子４の温度上昇の傾きの差を小さくする。 As is clear from the above description, according to the first embodiment of the present invention, the temperature rise in the temperature range where the amount of oil 2 in the pan 1 does not affect the temperature change of the temperature detection element 4, that is, the low temperature range. When the inclination t is detected and the inclination t of the temperature rise is gentle, that is, when the amount of warping of the bottom of the pan 1 is large, the heating energization rate is decreased, and the pan 1 generated by the warping of the bottom of the pan 1 is generated. The difference between the temperature increase gradient of the oil 2 and the temperature increase gradient of the temperature detection element 4 is reduced.

このことにより、鍋１内の油２の量が温度検出素子４の温度変化に影響を与える温度領域では、温度上昇の傾きｔから、その傾きｔがゆるやかな（長い）ほど油量が多いということが正確に検出されるとともに、検出された油量にもとづき、温度上昇の傾きｔがゆるやかな（長い）ほど、すなわち油量が多い時ほどパワーダウン温度Ｔを高くすることができる。 As a result, in the temperature range where the amount of oil 2 in the pan 1 affects the temperature change of the temperature detecting element 4, the oil amount increases as the inclination t becomes gentler (longer) than the inclination t of the temperature rise. Is detected accurately, and based on the detected oil amount, the power-down temperature T can be increased as the slope t of the temperature rise is gentler (longer), that is, as the oil amount is larger.

更に鍋１の底の反り量と油２の量に応じた加熱通電率にすることで、正確に油２の温度を検出することができるとともに、油量が少ない時は加熱通電率を小さくして油温度のオーバーシュートを小さくすることにより、安全に油の温度を制御し、油の異常加熱を防止することができるものである。 Furthermore, by setting the heating energization rate according to the warping amount of the bottom of the pan 1 and the amount of oil 2, the temperature of the oil 2 can be accurately detected, and when the oil amount is small, the heating energization rate is reduced. By reducing the overshoot of the oil temperature, the oil temperature can be controlled safely and abnormal oil heating can be prevented.

以上より、本発明の加熱調理器は、鍋底の反り量と油の量に応じた加熱通電率にすることで、正確に油の温度を検出することができ、油温のオーバーシュートを小さくできて、安全に油の温度を制御し、油の異常加熱を防止することができるから、電磁誘導加熱調理器に広く利用することができる。 From the above, the cooking device of the present invention can accurately detect the temperature of the oil and reduce the overshoot of the oil temperature by setting the heating energization rate according to the amount of warp of the pan bottom and the amount of oil. Thus, the temperature of the oil can be controlled safely and abnormal heating of the oil can be prevented, so that it can be widely used in electromagnetic induction heating cookers.

本発明の実施の形態１に係る加熱調理器の使用状態における全体構成図。The whole block diagram in the use condition of the heating cooker which concerns on Embodiment 1 of this invention. 図１に示す加熱調理器の全体の制御動作を示すフォローチャート。The follow chart which shows the whole control action of the heating cooker shown in FIG. 図１に示す加熱調理器の検出温度と加熱通電率の関係を示す説明図。Explanatory drawing which shows the relationship between the detection temperature of a heating cooker shown in FIG. 1, and a heating electricity rate. 図１に示す加熱調理器の制御温度の定義を示した表。The table | surface which showed the definition of the control temperature of the heating cooker shown in FIG. 図１に示す加熱調理器の鍋の反りの大きさを判定する場合の反りレベル判定表。The curvature level determination table | surface in the case of determining the magnitude | size of the curvature of the pan of the heating cooker shown in FIG. 図１に示す加熱調理器の鍋の反り量と加熱通電率の相関関係を示す表。The table | surface which shows the correlation of the curvature amount of the pan of a heating cooker shown in FIG. 1, and a heating electricity rate. 図１に示す加熱調理器の温度上昇値と鍋の油量の対応関係を示す表。The table | surface which shows the correspondence of the temperature rise value of the heating cooker shown in FIG. 1, and the oil amount of a pan. 図１に示す加熱調理器の鍋の反り量と油量の大きさに対応した加熱通電率一覧表。The heating energization rate table corresponding to the amount of warpage and oil amount of the pan of the heating cooker shown in FIG. 図１に示す加熱調理器の予熱終了温度Ｔ５の補正値の表。The table | surface of the correction value of the preheating end temperature T5 of the heating cooker shown in FIG. 従来の加熱調理器の一例を示す全体構成図。The whole block diagram which shows an example of the conventional heating cooker.

符号の説明Explanation of symbols

１：鍋、２：油、３：プレート、４：温度検出素子（Ａ）、５：温度検出素子（Ｂ）、６：加熱コイル、７：温度検出手段、８：制御手段、９：インバーター回路、１３：計時手段。 1: pan, 2: oil, 3: plate, 4: temperature detection element (A), 5: temperature detection element (B), 6: heating coil, 7: temperature detection means, 8: control means, 9: inverter circuit , 13: Timekeeping means.

Claims

加熱コイルと、
この加熱コイルを制御する制御手段と、
鍋を載せるプレートと、
前記プレートの下面に設けられ、前記プレート下面の温度を検出することにより前記鍋の温度を検出し前記制御手段に信号を送る温度検出素子と、
時間を計測し前記制御手段に信号を送る計時手段と、
を備え、
前記制御手段には、前記温度検出素子の検出値の傾きから底に反りのある鍋の油の異常加熱を防止するべく制御する第一の制御手段を備え、
この第一の制御手段は、前記温度検出素子による温度と前記計時手段による時間より温度上昇の傾きｔを求め、この温度上昇の傾きに応じて前記加熱コイルの加熱通電率を変更させるとともに、
前記温度上昇の傾きｔは、前記鍋内の油の量が前記温度検出素子の温度変化に影響しない温度領域である加熱開始初期段階の温度が低い第１の温度領域で求め、
前記制御手段には、前記温度検出素子の検出値の傾きから底に反りのある鍋の油の異常加熱を防止するべく制御する第二の制御手段を備え、
この第二の制御手段は、前記温度検出素子による温度と前記計時手段による時間より温度上昇の傾きｔｔを求め、この温度上昇の傾きに応じて前記加熱コイルの加熱通電率を変更させるとともに、前記鍋内の油の量が前記温度検出素子の温度変化に影響を与える温度領域である前記第１の温度領域よりも温度の高い第２の温度領域で前記傾きｔｔを求め、
前記第一の制御手段は、前記傾きｔがゆるやかであるほど前記加熱コイルの加熱通電率が小さくなるように前記第２の温度領域及び前記第２の温度領域よりも温度の高い第３の温度領域において制御し、
前記第二の制御手段は、前記傾きｔｔがゆるやかであるほど前記加熱コイルの加熱通電率を大きくするように前記第３の温度領域において制御動作を行なう
ことを特徴とする加熱調理器。 A heating coil;
Control means for controlling the heating coil;
A plate on which to put the pot,
A temperature detecting element for sending a signal to the control means detects the temperature of the pan by provided on the lower surface of the plate, for detecting a temperature of the plate lower surface,
Timing means for sending a signal to the control means measures the time,
With
Wherein the control means comprises a first control means for controlling so as to prevent abnormal heating of the oil from the slope of the detection value of the pot is warped on the bottom of said temperature detecting element,
The first control means determines the slope t of the temperature rise than the time according to the temperature and the time measuring means by the temperature detection element, together with changing the heat conduction rate of the heating coil in accordance with the inclination of the temperature rise,
The temperature rise slope t is determined in the first temperature range where the temperature at the initial stage of heating is low, which is the temperature range where the amount of oil in the pan does not affect the temperature change of the temperature detection element ,
The control means comprises a second control means for controlling to prevent abnormal heating of the oil in the pan warped from the inclination of the detection value of the temperature detection element,
The second control means obtains a temperature rise slope tt from the temperature by the temperature detecting element and the time by the time measuring means, and changes the heating energization rate of the heating coil in accordance with the temperature rise slope. Obtaining the slope tt in a second temperature region having a temperature higher than the first temperature region, which is a temperature region in which the amount of oil in the pan affects the temperature change of the temperature detection element;
The first control means includes a third temperature that is higher than the second temperature range and the second temperature range so that the heating energization rate of the heating coil becomes smaller as the inclination t is gentler. Control in the area ,
The cooking according to claim 2, wherein the second control means performs a control operation in the third temperature region so that the heating current rate of the heating coil is increased as the inclination tt is gentler. vessel.

前記制御手段には、前記温度検出素子の検出値の傾きから底に反りのある鍋の油の異常加熱を防止するべく制御する第三の制御手段を備え、
この第三の制御手段は、鍋内の油の量が前記温度検出素子の温度変化に影響を与える前記第２の温度領域で温度上昇の傾きｔｔを求め、この温度上昇の傾きに応じて異常加熱を防止するためのパワーダウン温度Ｔを決定し、前記温度上昇の傾きｔｔがゆるやかであるほどパワーダウン温度Ｔを高くする制御動作を前記第３の温度領域において行なうことを特徴とする請求項１記載の加熱調理器。 Wherein the control means comprises a third control means for controlling so as to prevent abnormal heating of the oil from the slope of the detection value of the pot is warped on the bottom of said temperature detecting element,
This third control means obtains a temperature rise slope tt in the second temperature range where the amount of oil in the pan affects the temperature change of the temperature detection element, and an abnormal condition is detected according to the temperature rise slope. The power-down temperature T for preventing the heating is determined, and the control operation for increasing the power-down temperature T as the slope tt of the temperature rise is gentle is performed in the third temperature region. 1 is a heating cooker.