JP4155263B2

JP4155263B2 - Cooker

Info

Publication number: JP4155263B2
Application number: JP2004359423A
Authority: JP
Inventors: 雅之 ▲高▼桑; 高弓福田
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2004-12-13
Filing date: 2004-12-13
Publication date: 2008-09-24
Anticipated expiration: 2024-12-13
Also published as: JP2006166953A

Description

本発明は、圧力容器（圧力鍋）を使用して調理する加熱調理器に関するものである。 The present invention relates to a cooking device for cooking using a pressure vessel (pressure cooker).

従来、この種の加熱調理器は、圧力容器の底面に接するように配置した温度センサにて圧力容器の底面温度を測定して、圧力容器の底面温度が圧力容器内の沸騰により圧力調整弁からの蒸気漏れが起こるよりも低い温度の圧力調理温度に達すると、所定の温度にて温度制御するものや加熱量を低減するものがあった（例えば、特許文献１参照）。 Conventionally, this type of cooking device measures the bottom temperature of the pressure vessel with a temperature sensor arranged so as to be in contact with the bottom surface of the pressure vessel, and the bottom temperature of the pressure vessel rises from the pressure regulating valve due to boiling in the pressure vessel. When a pressure cooking temperature lower than that at which steam leakage occurs is reached, there are those that control the temperature at a predetermined temperature and those that reduce the amount of heating (for example, see Patent Document 1).

図３は、従来の加熱調理器のブロック図を示すものである。図３において、圧力容器５１を器具本体５２に着脱自在に収納し、電気発熱体５３に載置している。圧力容器５１の蓋部には圧力容器５１内部の圧力を所定の圧力以下に抑制する圧力調整おもり５４を設置している。圧力容器５１の底面温度を検知する温度センサ５５を圧力容器５１の底面に接するように配置しており、温度センサ５５で検知した底面温度は制御回路５６に伝えられるように構成している。器具本体５２の側面には操作部５７を配置して制御回路５６に調理時間の設定や調理開始などの情報を伝えるようにしている。 FIG. 3 shows a block diagram of a conventional cooking device. In FIG. 3, the pressure vessel 51 is detachably accommodated in the instrument body 52 and placed on the electric heating element 53. A pressure adjusting weight 54 that suppresses the pressure inside the pressure vessel 51 to a predetermined pressure or less is installed on the lid portion of the pressure vessel 51. A temperature sensor 55 for detecting the bottom surface temperature of the pressure vessel 51 is disposed so as to contact the bottom surface of the pressure vessel 51, and the bottom surface temperature detected by the temperature sensor 55 is transmitted to the control circuit 56. An operation unit 57 is arranged on the side surface of the appliance main body 52 so that information such as setting of cooking time and start of cooking is transmitted to the control circuit 56.

ここで、圧力容器５１に調理物を入れ、電気発熱体５３に載置して操作部５７にて調理物に応じた調理時間をセットして調理開始を指示すると、制御回路５６は電気発熱体５３に通電を開始する。圧力容器５１の底面温度を温度センサ５５で検知し、圧力調整おもり５４から蒸気が出る温度の少し手前に設定した所定の温度に達すると、制御回路５６は操作部５７で設定した調理時間の減算タイマを作動させ、同時に電気発熱体５３への通電率を低下するか、または電気発熱体５３の通電を停止して温度の低下を温度センサ５５が検知すると再度電気発熱体５３への通電を行うという動作を繰り返して圧力容器５１の温度制御を行う。調理時間の減算タイマが終了すると制御回路５６は電気発熱体５３への通電を停止し、圧力容器５１内の温度が低下すると共に、圧力が低下し、調理が完了する。
特開平１０−２９０７４９号公報 Here, when the food is put in the pressure vessel 51 and placed on the electric heating element 53 and the operation time is set in the operation unit 57 to instruct the start of cooking, the control circuit 56 causes the electric heating element. 53 starts energization. When the temperature of the bottom surface of the pressure vessel 51 is detected by the temperature sensor 55 and reaches a predetermined temperature set slightly before the temperature at which the steam is discharged from the pressure adjusting weight 54, the control circuit 56 subtracts the cooking time set by the operation unit 57. At the same time, when the timer is activated and the energization rate of the electric heating element 53 is reduced or the electric heating element 53 is de-energized and the temperature sensor 55 detects a decrease in temperature, the electric heating element 53 is energized again. The temperature control of the pressure vessel 51 is performed by repeating the above operation. When the cooking time subtraction timer ends, the control circuit 56 stops energizing the electric heating element 53, the temperature in the pressure vessel 51 decreases, the pressure decreases, and cooking is completed.
Japanese Patent Application Laid-Open No. 10-290749

しかしながら、前記従来の構成では、圧力容器５１内が調理に適した圧力に達したかどうかの判断を温度センサ５５の絶対値で判断する必要があるため、温度センサ５５と温度センサの出力から温度を検知する温度検知回路の絶対値精度が高いレベルで必要になり、コストが上昇するという課題があった。また、温度検知の精度を高くするために圧力容器５１に面で接するような温度センサ５５構成とする必要があり、温度センサ５５のセンシングするための温度センサ部の可動構成や接触面の露出を回避できず、コストの上昇と意匠性の限界、使用耐久性の低下、お手入れ性の悪化が避けられないという課題を有していた。 However, in the conventional configuration, since it is necessary to determine whether or not the pressure vessel 51 has reached a pressure suitable for cooking based on the absolute value of the temperature sensor 55, the temperature sensor 55 and the output of the temperature sensor determine the temperature. There is a problem that the temperature detection circuit for detecting the temperature is required to have a high absolute value accuracy and the cost increases. Further, in order to increase the accuracy of temperature detection, it is necessary to adopt a temperature sensor 55 configuration that makes contact with the pressure vessel 51 on the surface, and the movable configuration of the temperature sensor unit for sensing by the temperature sensor 55 and the exposure of the contact surface are required. Inevitably, there was a problem that the increase in cost, the limit of designability, the decrease in durability of use, and the deterioration of careability were unavoidable.

本発明は、前記従来の課題を解決するもので、高精度の温度センサや温度検知回路、圧力容器に直接面接触させる温度センサ構成を必要とせずに、調理性能の向上と、意匠の自由度向上と、使用耐久性の向上と、お手入れ性の向上とを実現した加熱調理器を提供することを目的としている。 The present invention solves the above-described conventional problems, and does not require a high-precision temperature sensor, a temperature detection circuit, or a temperature sensor configuration that directly contacts the pressure vessel, and improves cooking performance and freedom of design. The object is to provide a cooking device that achieves improvements, improved durability of use, and improved care.

前記従来の課題を解決するために、本発明の加熱調理器は、トッププレートと、内部の圧力を所定の圧力以下に抑制する圧力調整弁を備えた圧力鍋の底面を前記トッププレート越しに誘導加熱するための加熱手段と、前記底面温度を前記トッププレート越しに測定する温度測定手段と、前記加熱手段を制御する制御部とを備え、前記制御部は前記底面温度の温度上昇傾向が上に凸状の飽和傾向から下に凸状の上昇加速傾向へ変わる屈曲点を検出すると、前記圧力鍋の内圧が周囲の気圧よりも高い圧力に加圧され始めたと判断し、前記屈曲点を検出した時点の前記底面温度である加圧開始温度Ｔ１から温度差α１だけ高い温
度Ｔ２に前記底面温度が達すると、前記加熱手段の火力を低下するようにしたものである。 In order to solve the above-described conventional problems, the cooking device of the present invention guides the bottom of a pressure cooker having a top plate and a pressure adjusting valve for suppressing the internal pressure to a predetermined pressure or less through the top plate. a heating means for heating, a temperature measuring means for measuring the bottom temperature in said top plate over, and a control unit for controlling the heating means, the control unit on the temperature rise of the bottom surface temperature When a bending point that changes from a convex saturation tendency to a downward convex acceleration tendency is detected, it is determined that the internal pressure of the pressure cooker has started to be higher than the surrounding atmospheric pressure, and the bending point is detected. When the bottom surface temperature reaches a temperature T2 that is higher by a temperature difference α1 than the pressurization start temperature T1, which is the bottom surface temperature at the time when the heat is applied, the heating power of the heating means is reduced.

これによって、１気圧沸騰付近の自然現象を基に温度制御できるので、高精度の温度センサや複雑な温度検知構成を使用せずして圧力調理の自動制御を行うことができる。 As a result, the temperature can be controlled based on a natural phenomenon in the vicinity of 1 atm boiling, so that automatic cooking of pressure cooking can be performed without using a highly accurate temperature sensor or a complicated temperature detection configuration.

本発明の加熱調理器は、一般精度の安価な温度センサや圧力鍋に非接触式の意匠性の高いセンサ構成を用いて加圧調理を実現することができる。 The cooking device of the present invention can realize pressure cooking using an inexpensive temperature sensor with general accuracy and a non-contact high sensor design for a pressure cooker.

第１の発明は、トッププレートと、内部の圧力を所定の圧力以下に抑制する圧力調整弁を備えた圧力鍋の底面を前記トッププレート越しに誘導加熱するための加熱手段と、前記底面温度を前記トッププレート越しに測定する温度測定手段と、前記加熱手段を制御する制御部とを備え、前記制御部は前記底面温度の温度上昇傾向が上に凸状の飽和傾向から下に凸状の上昇加速傾向へ変わる屈曲点を検出すると、前記圧力鍋の内圧が周囲の気圧よりも高い圧力に加圧され始めたと判断し、前記屈曲点を検出した時点の前記底面温度である加圧開始温度Ｔ１から温度差α１だけ高い温度Ｔ２に前記底面温度が達すると、前記加熱手段の火力を低下するとすることにより、１気圧沸騰付近の自然現象を基に温度制御できるので、高精度の温度センサや温度検知構成を使用せずとも安価で圧力調理の自動制御ができ且つ意匠性の高い加熱調理器を実現することができる。 1st invention is a heating means for induction- heating the bottom face of the pressure cooker provided with the top plate and the pressure control valve which suppresses an internal pressure below to a predetermined pressure through the top plate , and said bottom face temperature A temperature measuring unit that measures the temperature through the top plate; and a control unit that controls the heating unit, wherein the control unit has a temperature rising tendency of the bottom surface temperature that is convex upward from a convex convex tendency When a bending point that changes to an acceleration tendency is detected, it is determined that the internal pressure of the pressure cooker has started to be pressurized to a pressure higher than the surrounding atmospheric pressure, and the pressurization start temperature that is the bottom surface temperature when the bending point is detected When the bottom temperature from T1 to the temperature difference α1 only high temperature T2 is reached, by the lowering the heating power of the heating means, since the natural phenomena in the vicinity of 1 atm boiling temperature can be controlled based on, Ya temperature sensor with high accuracy Without using the degree detection arrangement can be realized and design highly cooker can automatically control the pressure cooking inexpensive.

第２の発明は、特に、第１の発明の制御部を、温度測定手段で測定した底面温度の温度上昇勾配を前回までに測定した前記温度上昇勾配の最小値に比べて小さいときに前記最小値を更新することで前記温度上昇勾配の最小値を求めるとともに、前記温度上昇勾配の最小値よりも大きな温度上昇勾配しきい値を設定し、前記温度上昇勾配が前記温度上昇勾配しきい値を上回るのを検知したときの前記底面温度を加熱開始温度Ｔ１とするようにしたとすることにより、具体的に第２の発明の加熱調理器を実現することができる。 In the second invention, particularly when the control unit of the first invention has a temperature rise gradient of the bottom surface temperature measured by the temperature measuring means smaller than the minimum value of the temperature rise gradient measured so far, the minimum Rutotomoni by updating the value determining the minimum value of the temperature increase gradient, sets a large temperature increase gradient threshold than the minimum value of the temperature rise gradient, before Symbol temperature rise gradient and the temperature increase gradient by to have the bottom surface temperature when it is detected that the above thresholds as the heating start temperature T1, it is possible to realize a cooking device specifically second invention.

第３の発明は、特に、第２の発明の制御部を、温度上昇勾配が温度上昇勾配しきい値を上回るのを検知したときの底面温度を加熱開始温度Ｔ１とすることに代え、前記温度上昇勾配の最小値を最後に更新したときの前記底面温度を記憶しておき、前記温度上昇傾向の屈曲点を検出したときに、記憶している前記底面温度を加圧開始温度Ｔ１とするとすることにより、温度上昇傾向の屈曲点の判断遅れが発生しても自然現象を基にした正確な情報である１気圧の沸騰時点の温度を基準にできるので、より精度の良い圧力調理の自動制御を行える加熱調理器を実現することができる。 In the third invention, in particular, the controller of the second invention replaces the bottom surface temperature when detecting that the temperature increase gradient exceeds the temperature increase gradient threshold with the heating start temperature T1, and the temperature stores the bottom temperature at the time of updating the minimum value of the rising slope at the end, when it detects a bending point of the previous SL temperature rise, the bottom temperature and the stored pressure start temperature T1 As a result, even if there is a delay in judging the inflection point of the temperature rising tendency, the temperature at the boiling point of 1 atm, which is accurate information based on the natural phenomenon, can be used as a reference, so that more accurate pressure cooking is possible. A cooking device capable of automatic control can be realized.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、本実施の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

（実施の形態１）
図１は、本発明の実施の形態における加熱調理器のブロック図を示すものである。 (Embodiment 1)
FIG. 1 shows a block diagram of a cooking device according to an embodiment of the present invention.

図１において、加圧調理をする圧力鍋１をトッププレート２に載置し、加熱手段３により圧力鍋１をトッププレート２越しに誘導加熱する。圧力鍋１内の圧力が加圧されていない状態にて内部の水分が沸騰すると蒸気が発生して蒸気圧や流量による差圧などにより加圧弁９を閉じるように作用する。その後、さらに加熱を続けると圧力鍋１内の圧力が高くなり、圧力が所定の圧力に達すると圧力鍋１の蓋部に設置した圧力調整弁４から圧力鍋１内の蒸気を放出して圧力鍋１内の圧力を所定の圧力以下に抑制する。温度検知手段（温度測定手段）５は圧力鍋１の底面の温度をトッププレート２越しに温度検知し、制御部６は
温度検知手段５で検知した温度に応じて加熱手段３を制御する。使用者は操作部７を操作して圧力調理時間の設定と調理の開始を制御部６に伝える。圧力調理タイマ８は減算タイマでありタイマの減算が終了すると制御部６にタイマの計時完了を伝える。 In FIG. 1, a pressure cooker 1 for pressure cooking is placed on a top plate 2, and the pressure cooker 1 is induction-heated through the top plate 2 by a heating means 3. When the internal water boils in a state where the pressure in the pressure cooker 1 is not pressurized, steam is generated and acts to close the pressurizing valve 9 by a differential pressure due to the vapor pressure or flow rate. Thereafter, when the heating is further continued, the pressure in the pressure cooker 1 increases, and when the pressure reaches a predetermined pressure, the steam in the pressure cooker 1 is discharged from the pressure adjustment valve 4 installed on the lid of the pressure cooker 1 to increase the pressure. The pressure in the pan 1 is suppressed to a predetermined pressure or less. The temperature detection means (temperature measurement means) 5 detects the temperature of the bottom surface of the pressure cooker 1 through the top plate 2, and the control unit 6 controls the heating means 3 according to the temperature detected by the temperature detection means 5. The user operates the operation unit 7 to inform the control unit 6 of the setting of the pressure cooking time and the start of cooking. The pressure cooking timer 8 is a subtraction timer, and when the subtraction of the timer is completed, the control unit 6 is notified of the completion of the timer timing.

以上のように構成された加熱調理器について、以下その動作、作用を説明する。 About the cooking-by-heating machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

まず、圧力鍋１に調理物を入れ、圧力調整おもりなどで構成される圧力調整弁４をセットする。圧力鍋１をトッププレート２の所定の位置に載置し、操作部７により加圧調理時間を設定して、調理開始の指示をすると、制御部６は加熱手段３を通電して圧力鍋１を加熱する。圧力鍋１の温度が上昇して１気圧の沸騰が始まると加圧弁９を通って蒸気が圧力鍋１外に放出されるため気化熱の放出により圧力鍋１の温度上昇が飽和傾向になる。さらに蒸気の流量が増えてくると流量による差圧により加圧弁９が閉じ、圧力鍋１内の気圧が上昇し、圧力鍋１の鍋底温度も再度上昇を続ける。さらに加熱手段３による加熱を続け、圧力鍋１内の気圧が圧力調整弁４により設定している所定の圧力に達すると圧力調整弁４が作動して圧力鍋１内の蒸気が放出され、圧力鍋１内の気圧が圧力調整弁４により設定している所定の圧力に維持される。 First, the cooked food is put into the pressure cooker 1, and the pressure regulating valve 4 constituted by a pressure regulating weight or the like is set. When the pressure cooker 1 is placed at a predetermined position on the top plate 2, a pressure cooking time is set by the operation unit 7, and an instruction to start cooking is given, the control unit 6 energizes the heating means 3 to turn on the pressure cooker 1. Heat. When the temperature of the pressure cooker 1 rises and boiling at 1 atm begins, steam is released out of the pressure cooker 1 through the pressurizing valve 9 and the temperature rise of the pressure cooker 1 tends to become saturated due to the release of heat of vaporization. When the flow rate of steam further increases, the pressure valve 9 is closed by the pressure difference due to the flow rate, the atmospheric pressure in the pressure cooker 1 rises, and the pan bottom temperature of the pressure cooker 1 continues to rise again. Further, heating by the heating means 3 is continued, and when the atmospheric pressure in the pressure cooker 1 reaches a predetermined pressure set by the pressure regulating valve 4, the pressure regulating valve 4 is actuated to release steam in the pressure cooker 1, The atmospheric pressure in the pan 1 is maintained at a predetermined pressure set by the pressure adjustment valve 4.

図２は、本発明の実施の形態における加熱調理器の温度検知手段５の温度変化チャートを示すものである。 FIG. 2 shows a temperature change chart of the temperature detecting means 5 of the cooking device in the embodiment of the present invention.

図２において、温度検知手段５の温度が温度θ０である時間ｔ０にて調理を開始し、制御部６は加熱手段３を制御してトッププレート２越しに圧力鍋１を加熱する。温度検知手段５は調理開始後は常にトッププレート２越しに圧力鍋１の鍋底温度を検知し続けており、制御部６は、温度上昇の傾向を知るために例えば温度が１度上昇するのに掛かる時間を計時し続けている。 In FIG. 2, cooking is started at time t <b> 0 when the temperature of the temperature detection means 5 is the temperature θ <b> 0, and the control unit 6 controls the heating means 3 to heat the pressure cooker 1 through the top plate 2. The temperature detection means 5 always detects the temperature at the bottom of the pressure cooker 1 through the top plate 2 after the start of cooking, and the control unit 6 determines that the temperature rises once, for example, in order to know the tendency of the temperature rise. I keep counting the time it takes.

温度上昇の傾向が最も上昇速度の遅い状態を探るため、温度が１度上昇するのに掛かる時間が前回までに測定した最大の時間と比較して、より長ければ記憶していた最大の時間を更新する。圧力鍋１の温度上昇速度は圧力鍋１内の水分が１００℃に近づくにつれて気化熱によりエネルギーが奪われるため１気圧の沸騰の時間ｔ３直後で圧力鍋１の温度上昇速度が最も遅くなり、従って温度検知手段５の検知遅れ時間のため時間ｔ４で温度検知手段５の温度上昇速度が最も遅くなり、そのときの温度上昇傾きを傾きＡｍｉｎとする。 In order to search for the slowest rate of temperature rise, the maximum time stored in memory is the longer the time it takes for the temperature to rise once compared to the maximum time measured so far. Update. The temperature rise rate of the pressure cooker 1 is deprived of energy by the heat of vaporization as the moisture in the pressure cooker 1 approaches 100 ° C., so the temperature rise rate of the pressure cooker 1 becomes the slowest immediately after the boiling time t3 of 1 atm. Because of the detection delay time of the temperature detection means 5, the temperature rise speed of the temperature detection means 5 is the slowest at time t4, and the temperature rise slope at that time is defined as the slope Amin.

調理を開始してから圧力鍋１の内容物が沸点に達して１気圧の沸騰を継続すると加圧弁９を備えている場合は蒸気の発生量が増加し、蒸気の流量による差圧によって加圧弁９が閉じ、加圧弁９を備えていない場合でも１気圧の沸騰を継続すると圧力鍋１内の気圧が上昇し始めることにより、圧力鍋１内の沸点が上昇し始めるため、圧力鍋１の温度が再び上昇して行くことにより温度検知手段５の温度上昇速度が再び速くなり始める。この温度上昇速度の変化を検知することにより加圧開始を検知することができる。例えば、温度検知手段５の温度上昇傾きの最小値であった傾きＡｍｉｎにおける１度上昇するのに掛かる時間の２／３未満の時間で１度上昇するのを検知した時点の時間ｔ５が圧力鍋１の加圧開始を検知したタイミングとなる。そのときの温度上昇傾きが傾きＡ１である。上記においての傾きＡｍｉｎに対する傾きＡ１が温度上昇勾配しきい値であり、温度検知手段５の検知温度の温度上昇勾配がＡ１以上、すなわち傾きＡｍｉｎにおける１度上昇するのに掛かる時間の２／３未満の時間で１度上昇するのを検知することをもって加圧開始検知を完了するように動作する。 When the contents of the pressure cooker 1 reach the boiling point after cooking is started and the boiling of 1 atm is continued, when the pressurizing valve 9 is provided, the amount of steam generated increases, and the pressurizing valve is caused by the differential pressure due to the steam flow rate. Even when 9 is closed and the pressurizing valve 9 is not provided, if boiling at 1 atm is continued, the pressure in the pressure cooker 1 starts to rise, and the boiling point in the pressure cooker 1 begins to rise. As the temperature rises again, the temperature rise speed of the temperature detecting means 5 starts to increase again. The start of pressurization can be detected by detecting the change in the temperature rise rate. For example, the time t5 when the temperature detection means 5 detects that the temperature rises 1 degree in less than 2/3 of the time taken to rise 1 degree in the slope Amin, which is the minimum value of the temperature rise slope, is the pressure cooker. 1 is the timing when the start of pressurization is detected. The temperature rise inclination at that time is the inclination A1. In the above, the gradient A1 with respect to the gradient Amin is a temperature increase gradient threshold value, and the temperature increase gradient of the temperature detected by the temperature detection means 5 is not less than A1, that is, less than 2/3 of the time required for the gradient Amin to rise once. It operates so as to complete the pressurization start detection by detecting a rise of 1 degree in the time.

加圧開始検知を完了した時点の温度検知手段５の検知温度を温度Ｔ１としたときに温度Ｔ１よりも所定の温度差α１だけ高い温度を温度Ｔ２としたとき、加圧開始検知完了後も加熱を続けていくと温度検知手段５の検知温度は圧力鍋１の内圧上昇すなわち温度上昇に
伴い上昇していき、温度Ｔ２に達すると所定の圧力に達したと判断して制御部６は加熱手段３の火力を低下させて圧力鍋１の内圧の上昇すなわち温度の上昇速度を低下させ、圧力鍋１の内圧を所定の圧力に制御する。目標の内圧とするための温度Ｔ２は絶対値ではなく、１気圧の沸騰に伴う自然現象により決定した温度Ｔ１に基づいて相対的に決定しているため、内圧の精度は温度Ｔ１の精度に依存するが、絶対温度精度の悪い温度検知機構にて絶対温度でＴ２を決定するのに比べると、温度Ｔ１は１気圧の沸騰による温度上昇の変化や加圧弁の閉作動を観測することで比較的精度良く決定することができる。 When the detected temperature of the temperature detecting means 5 at the time when the pressurization start detection is completed is the temperature T1, when the temperature T2 is a temperature higher than the temperature T1 by a predetermined temperature difference α1, the heating is performed after the pressurization start detection is completed. As the temperature continues, the temperature detected by the temperature detecting means 5 rises as the internal pressure of the pressure cooker 1 rises, that is, the temperature rises. When the temperature reaches the temperature T2, the controller 6 determines that the predetermined pressure has been reached. 3 is reduced to decrease the internal pressure of the pressure cooker 1, that is, the rate of temperature rise, and control the internal pressure of the pressure cooker 1 to a predetermined pressure. The temperature T2 for setting the target internal pressure is not an absolute value, but is relatively determined based on the temperature T1 determined by a natural phenomenon accompanying boiling of 1 atm. Therefore, the accuracy of the internal pressure depends on the accuracy of the temperature T1. However, as compared with the case where T2 is determined by the absolute temperature with a temperature detection mechanism with poor absolute temperature accuracy, the temperature T1 is relatively observed by observing a change in temperature rise due to boiling of 1 atm or a closing operation of the pressurizing valve. It can be determined with high accuracy.

しかしながら、１気圧沸騰検知時点の温度Ｔ１は圧力鍋１や温度検知機構などの熱容量や、検知アルゴリズムの判定時間などにより、実際に圧力鍋１の内圧が加圧開始された時点からはいくらか検知遅れが生じるため、温度Ｔ１を基準に設定した温度Ｔ２は若干の誤差を含んでいる。その誤差を少しでも低減するべく、圧力鍋１が実際に加圧開始され始めたタイミングに最も近いパラメータを利用するために、温度検知手段５の温度上昇速度が最も遅くなる傾きＡｍｉｎの時点が圧力鍋１の加圧開始のタイミングに比較的近い事象であることから、傾きＡ１を検知したときにそれ以前の最も温度上昇速度の遅い傾きＡｍｉｎ時点で記憶した温度Ｔ１’を基準に温度Ｔ２を設定することにすれば実際の加圧開始の時点からＡ１検知までの検知遅れによるＴ１の検知誤差を低減することができる。図２に説明のため温度Ｔ１’に対するＴ２までの温度差をα２として記載している。 However, the temperature T1 at the time of detection of 1 atmospheric pressure boiling is somewhat delayed from the time when the internal pressure of the pressure cooker 1 is actually started due to the heat capacity of the pressure cooker 1 and the temperature detection mechanism and the determination time of the detection algorithm. Therefore, the temperature T2 set based on the temperature T1 includes a slight error. In order to reduce the error as much as possible, in order to use the parameter closest to the timing at which the pressure cooker 1 actually starts to pressurize, the time point of the slope Amin at which the temperature rise speed of the temperature detecting means 5 is the slowest is the pressure. Since this is an event that is relatively close to the timing of starting pressurization of the pan 1, the temperature T2 is set based on the temperature T1 ′ stored at the time of the slope Amin at which the temperature rise rate is the slowest when the slope A1 is detected. If it does so, the detection error of T1 by the detection delay from the time of an actual pressurization start to A1 detection can be reduced. In FIG. 2, the temperature difference up to T2 with respect to the temperature T1 'is described as α2.

なお、圧力鍋１の構造として、１気圧の沸騰にて発生する蒸気の流動力により蓋部に設置した加圧弁９を閉じる構造の場合には加圧弁９が閉じるまでの間は加圧弁９から蒸気を排出することにより温度検知手段５の温度上昇傾きの最小値がより小さくなるため１気圧沸騰後の温度上昇傾きとの差がより顕著に現れ、加圧開始の検知がより精度よくできる。 In the case of a structure in which the pressurizing valve 9 installed on the lid is closed by the flow force of steam generated by boiling at 1 atm as the structure of the pressure cooker 1, the pressurizing valve 9 starts until the pressurizing valve 9 is closed. By discharging the steam, the minimum value of the temperature rise slope of the temperature detecting means 5 becomes smaller, so the difference from the temperature rise slope after boiling at 1 atmosphere appears more remarkably, and the start of pressurization can be detected with higher accuracy.

また、これまで説明した鍋底温度センサを用いて加圧弁９が閉じたことを検知する方式の他に、加圧弁９が閉じたかどうかの判断を、加圧弁９に内蔵したマグネットとホール素子などの磁気検知素子を用いて弁が閉じたことを検知したり、加圧弁９から放出される蒸気の流量や温度を検知することで弁が閉じたことを検知したりするなどして実際の加圧弁９の動作に近い所で判断するとより精度のよい加圧開始の検知ができる。 In addition to the method of detecting that the pressurization valve 9 has been closed using the pan bottom temperature sensor described so far, the determination of whether the pressurization valve 9 has been closed, such as a magnet and a Hall element built in the pressurization valve 9, etc. The actual pressurizing valve is detected by detecting that the valve is closed by using a magnetic detecting element, or by detecting the flow rate or temperature of the steam discharged from the pressurizing valve 9 to detect that the valve is closed. If the judgment is made at a place close to the operation No. 9, it is possible to detect the pressurization start with higher accuracy.

また一方で、温度検知手段５の検知温度が温度Ｔ２に達すると所定の圧力に達したということなので、操作部７により調理開始前に使用者が設定した圧力調理時間を圧力調理タイマ８に引渡し減算タイマを作動させる。圧力調理タイマ８の減算が完了すると制御部６は圧力調理の終了を報知すると同時に加熱手段３への通電を停止する。 On the other hand, when the temperature detected by the temperature detecting means 5 reaches the temperature T2, it means that the predetermined pressure has been reached, so that the pressure cooking time set by the user before starting cooking is transferred to the pressure cooking timer 8 by the operation unit 7. Activate the subtraction timer. When the subtraction of the pressure cooking timer 8 is completed, the control unit 6 notifies the end of the pressure cooking and simultaneously stops energization of the heating means 3.

以上のように、本実施の形態においては、圧力鍋１の内圧が周囲の気圧よりも高い圧力に加圧され始めた時点で温度検知手段５にて測定した圧力鍋１の加圧開始温度Ｔ１から所定温度α１だけ高い温度Ｔ２に達すると加熱手段３の火力を低下するようにしたことにより高精度の温度センサや複雑な温度検知構成を使用せずして圧力調理の自動制御を行うことができ、本実施の形態のようにトッププレートを介して温度検知手段５が圧力鍋１に直接触れていない構成であっても温度検知手段５の絶対温度精度があまり高く求められないため圧力調理の自動制御が可能であり、従って意匠の自由度が高く、シンプルな構成にでき、使用耐久性があり、お手入れ性のよい加熱調理器を実現することができる。さらに、絶対温度による検知ではなく、圧力鍋１の加圧開始を検知した後、所定の温度だけ高い温度にて火力を低下する構成のため、大気圧が低い高地での使用において、保護装置として機能する圧力調整弁４の作動圧が低下しても加圧開始の温度も低下するため先に保護装置が作動する逆転現象が発生しにくく、若干圧力鍋１内の圧力が低くなるものの正常に調圧をすることができる。 As described above, in the present embodiment, the pressurization start temperature T1 of the pressure cooker 1 measured by the temperature detecting means 5 when the internal pressure of the pressure cooker 1 starts to be pressurized to a pressure higher than the ambient pressure. When the temperature reaches a temperature T2 that is higher by a predetermined temperature α1, the heating power of the heating means 3 is reduced, so that automatic control of pressure cooking can be performed without using a highly accurate temperature sensor or a complicated temperature detection configuration. Even if the temperature detection means 5 is not in direct contact with the pressure cooker 1 through the top plate as in the present embodiment, the absolute temperature accuracy of the temperature detection means 5 is not required to be so high, so that the pressure cooking Automatic cooking is possible, so that the degree of freedom of design is high, the structure can be made simple, and the cooking device is durable and easy to maintain. Furthermore, it is not a detection by the absolute temperature, but after detecting the start of pressurization of the pressure cooker 1, it is configured to reduce the thermal power at a temperature higher by a predetermined temperature, so that it can be used as a protective device in use at high altitude where the atmospheric pressure is low. Even if the operating pressure of the functioning pressure regulating valve 4 decreases, the temperature at the start of pressurization also decreases, so that the reverse phenomenon in which the protective device operates first is unlikely to occur, and although the pressure in the pressure cooker 1 slightly decreases, it is normal. The pressure can be adjusted.

また、温度検知手段５で測定した圧力鍋１の温度上昇傾向が上に凸状の飽和傾向から下
に凸状の上昇加速傾向への屈曲点を検知することにより圧力鍋１が加圧開始したと判断するようにしたことにより、トッププレートを介して圧力鍋１に直接触れていない構成の温度検知手段５であっても圧力鍋１の加圧開始を検知することができるため、意匠の自由度の高い、お手入れ性に優れた圧力調理のできる加熱調理器を実現することができる。 Moreover, the pressure cooker 1 started pressurization by detecting the inflection point of the temperature rising tendency of the pressure cooker 1 measured by the temperature detecting means 5 from the upward convex saturation tendency to the downward convex acceleration tendency. Since it is possible to detect the start of pressurization of the pressure cooker 1 even with the temperature detection means 5 having a configuration in which the pressure cooker 1 is not directly touched via the top plate, it is possible to freely design. It is possible to realize a cooking device that can perform pressure cooking with high degree of care and excellent care.

また、温度検知手段５で測定した圧力鍋１の温度上昇傾向を基に温度上昇勾配の最小値を求め、温度上昇勾配の最小値に応じた温度上昇勾配しきい値を設定し、圧力鍋１の温度上昇勾配が温度上昇勾配しきい値を上回るのを検知することにより圧力鍋１の温度上昇傾向の屈曲点であると判断するようにしたことにより、具体的に温度上昇傾向の屈曲点を検出する方法を提供するものである。 Further, the minimum value of the temperature increase gradient is obtained based on the temperature increase tendency of the pressure cooker 1 measured by the temperature detecting means 5, and the temperature increase gradient threshold value corresponding to the minimum value of the temperature increase gradient is set. By detecting that the temperature rising gradient of the pressure cooker exceeds the temperature rising gradient threshold value, it is determined that it is the inflection point of the temperature increasing tendency of the pressure cooker 1. A method for detection is provided.

また、温度上昇勾配の最小値を最後に更新したときに温度測定手段で測定した圧力鍋１の温度を記憶しておき、圧力鍋１の温度上昇傾向の屈曲点を検出したときに、記憶している温度上昇勾配の最小値時点の圧力鍋の温度を加圧開始温度Ｔ１とするようにしたことにより、温度検知手段の検知遅れなどによる誤差の影響を低減でき、より精度のよい加圧開始検知ができ、調理性能のよい圧力調理のできる加熱調理器を実現することができる。 Further, the temperature of the pressure cooker 1 measured by the temperature measuring means when the minimum value of the temperature rise gradient is last updated is stored, and stored when the bending point of the temperature rising tendency of the pressure cooker 1 is detected. By making the pressure cooker temperature at the time of the minimum value of the temperature rise gradient to be the pressurization start temperature T1, it is possible to reduce the influence of errors due to the detection delay of the temperature detection means, and to start pressurization with higher accuracy It is possible to realize a cooking device that can detect pressure cooking with good cooking performance.

また、圧力鍋１内の１気圧付近の沸騰による蒸気圧により圧力鍋１を密閉する加圧弁を設け、加圧弁が閉じるのを検知することにより圧力鍋１が加圧開始したと判断するようにしたことにより、加圧開始検知を絶対温度以外の現象により判断することができ、より信頼性の高い加圧開始検知を設計することが可能となり、調理性能のよい圧力調理のできる加熱調理器を実現することができる。 Further, a pressurization valve that seals the pressure cooker 1 by a vapor pressure caused by boiling near 1 atm in the pressure cooker 1 is provided, and it is determined that the pressure cooker 1 has started pressurization by detecting that the pressurization valve is closed. Therefore, it is possible to determine the pressure start detection by a phenomenon other than absolute temperature, and it is possible to design a more reliable pressure start detection, and a cooking device capable of pressure cooking with good cooking performance. Can be realized.

なお、本実施の形態において、制御部６は、温度上昇の傾向を知るために温度が１度上昇するのに掛かる時間を計時したが、計時する温度上昇の単位は０．５度など他の値でも良く、または温度ではなくサーミスタの抵抗値や回路上の電圧値などを検出して利用したものでも良い。 In the present embodiment, the control unit 6 measures the time taken for the temperature to rise once in order to know the tendency of the temperature rise. However, the unit of the temperature rise to be measured is 0.5 degree or the like. A value may be used, or a resistance value of a thermistor or a voltage value on a circuit may be detected and used instead of temperature.

また、温度上昇の傾向を知る手段としては一定時間中に上昇する温度を測定するものとしても良い。 Further, as a means for knowing the tendency of temperature rise, the temperature rising during a certain time may be measured.

以上のように、本発明の加熱調理器は、専用の圧力調理器として以外に、汎用の鍋を使用できかつ圧力鍋も使用できる汎用の加熱調理器等の用途にも適用できる。 As described above, the heating cooker of the present invention can be applied to uses such as a general-purpose heating cooker that can use a general-purpose pan and can also use a pressure cooker, as well as a dedicated pressure cooker.

本発明の実施の形態１における加熱調理器のブロック図The block diagram of the heating cooker in Embodiment 1 of this invention 本発明の実施の形態１における加熱調理器の温度検知手段の温度変化チャートTemperature change chart of temperature detection means of cooking device in Embodiment 1 of the present invention 従来の加熱調理器のブロック図Block diagram of a conventional cooking device

符号の説明Explanation of symbols

１圧力鍋
２トッププレート
３加熱手段
４圧力調整弁
５温度検知手段（温度測定手段）
６制御部
９加圧弁 DESCRIPTION OF SYMBOLS 1 Pressure cooker 2 Top plate 3 Heating means 4 Pressure regulating valve 5 Temperature detection means (temperature measurement means)
6 Control part 9 Pressurizing valve

Claims

トッププレートと、内部の圧力を所定の圧力以下に抑制する圧力調整弁を備えた圧力鍋の底面を前記トッププレート越しに誘導加熱するための加熱手段と、前記底面温度を前記トッププレート越しに測定する温度測定手段と、前記加熱手段を制御する制御部とを備え、前記制御部は前記底面温度の温度上昇傾向が上に凸状の飽和傾向から下に凸状の上昇加速傾向へ変わる屈曲点を検出すると、前記圧力鍋の内圧が周囲の気圧よりも高い圧力に加圧され始めたと判断し、前記屈曲点を検出した時点の前記底面温度である加圧開始温度Ｔ１から温度差α１だけ高い温度Ｔ２に前記底面温度が達すると、前記加熱手段の火力を低下するようにした加熱調理器。 A heating means for induction heating the bottom surface of the pressure cooker provided with a top plate and a pressure regulating valve that suppresses the internal pressure below a predetermined pressure, and the bottom surface temperature is measured over the top plate. A temperature measuring means that controls the heating means, and the control part changes a temperature rising tendency of the bottom surface temperature from an upward convex tendency to a downward convex acceleration tendency. Is detected, it is determined that the internal pressure of the pressure cooker has started to be increased to a pressure higher than the ambient pressure, and only a temperature difference α1 from the pressurization start temperature T1 that is the bottom surface temperature at the time when the bending point is detected. A heating cooker configured to reduce the heating power of the heating means when the bottom surface temperature reaches a high temperature T2.

制御部は、温度測定手段で測定した底面温度の温度上昇勾配を前回までに測定した前記温度上昇勾配の最小値に比べて小さいときに前記最小値を更新することで前記温度上昇勾配の最小値を求めるとともに、前記温度上昇勾配の最小値よりも大きな温度上昇勾配しきい値を設定し、前記温度上昇勾配が前記温度上昇勾配しきい値を上回るのを検知したときの前記底面温度を加熱開始温度Ｔ１とするようにした請求項１に記載の加熱調理器。 The control unit updates the minimum value when the temperature rising gradient of the bottom surface temperature measured by the temperature measuring unit is smaller than the minimum value of the temperature rising gradient measured up to the previous time, thereby updating the minimum value of the temperature rising gradient. the calculated Rutotomoni, the bottom temperature at which the set of large temperature increase gradient threshold than the minimum value of the temperature rise gradient, before Symbol temperature increase gradient detects that the excess of the temperature increase gradient threshold the heating cooker as claimed in claim 1 which is adapted to the heating start temperature T1 a.

制御部は、温度上昇勾配が温度上昇勾配しきい値を上回るのを検知したときの底面温度を加熱開始温度Ｔ１とすることに代え、前記温度上昇勾配の最小値を最後に更新したときの前記底面温度を記憶しておき、前記温度上昇傾向の屈曲点を検出したときに、記憶している前記底面温度を加圧開始温度Ｔ１とするようにした請求項２に記載の加熱調理器。 The control unit replaces the bottom surface temperature when it is detected that the temperature increase gradient exceeds the temperature increase gradient threshold value with the heating start temperature T1, and the minimum value of the temperature increase gradient is updated last time . stores the bottom temperature, upon detection of the bending point of the previous SL temperature rise, heating cooker according to claim 2 in which the bottom temperature being stored and so that the pressure start temperature T1 .