EP0652688A1 - Méthode pour commander la puissance de chauffage d'une plaque viro-céramique selon les conditions de cuisson requises - Google Patents

Méthode pour commander la puissance de chauffage d'une plaque viro-céramique selon les conditions de cuisson requises Download PDF

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Publication number
EP0652688A1
EP0652688A1 EP94116526A EP94116526A EP0652688A1 EP 0652688 A1 EP0652688 A1 EP 0652688A1 EP 94116526 A EP94116526 A EP 94116526A EP 94116526 A EP94116526 A EP 94116526A EP 0652688 A1 EP0652688 A1 EP 0652688A1
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EP
European Patent Office
Prior art keywords
temperature
pot
heating
determined
cooking
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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.)
Granted
Application number
EP94116526A
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German (de)
English (en)
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EP0652688B1 (fr
Inventor
Jürgen Luther
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AEG Hausgeraete GmbH
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Daimler Benz AG
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/68Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746Protection, e.g. overheat cutoff, hot plate indicator

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • Such a method is known from DE-A1 35 30 403.
  • the method described there is intended for automatic control of the heating process of an electric heating plate during the cooking of food and for avoiding overcooking at the end of the cooking process.
  • the heating power of an electric hotplate is set to a selectable constant value.
  • the temperature rise of the bottom of the cooking vessel is continuously determined over time.
  • the actual gradient value is compared with a specified target gradient value and, in the event of deviations, the heating power is switched to bring the actual gradient value closer to the target gradient value.
  • the boiling heat output is switched off when the slope of the pot bottom temperature is bent.
  • This method has the disadvantage that it is first regulated to a constant heating rate and therefore, when the desired maximum temperature is reached, the temperature is still undesirably exceeded.
  • DE-A1 40 22 846 describes the power control and limitation for a heating surface made of glass ceramic.
  • a number of heating elements which can be switched and controlled independently of one another are provided and are switched on and off as required by means of temperature sensors which are arranged in the region of the heating zone.
  • this method is only able to avoid local temperature increases. It is not possible to adapt the heating output to a cooking or cooking process.
  • inductive sensors which are arranged under the ceramic plate of the hob.
  • Such an inductive sensor consists, for example, of two or more electrodes below the ceramic plate, which together with a pot base form two or more capacitors, the capacitance of which can be queried. From capacitance differences, an asymmetry with regard to the pot position can then be inferred and the heating output can thus be interrupted.
  • a hob with automatic pan detection in the form of a capacitive presence sensor is from the European. Patent application EP-A1 0 374 868 known.
  • the electrodes form concentric circles, which are part of an oscillator circuit.
  • this oscillator circuit is adjustable in such a way that this circuit does not start when there is no pan on the hob.
  • the conductivity of the glass ceramic means that the ohmic losses in the glass ceramic reduce the capacitance of the measuring capacitor arrangement, so that the resonance condition can no longer be met. At higher temperatures, the oscillator will no longer oscillate.
  • the invention is therefore based on the object of specifying a method which enables completely safe operation of the hob, in that all overheating leading to damage to the glass ceramic, the pot or the food is recognized and eliminated in good time. Furthermore, temperature detection should be able to be carried out independently of the type of pot, the size of the pot and the aging of the sensor. Another object of the invention is to use electrical energy as sparingly as possible and thus to reduce energy consumption compared to conventional methods.
  • the invention will be particularly applicable where great security is important and it cannot be assumed that the cooking process is constantly and properly monitored.
  • a fault-tolerant cooking process is of great interest in all households, in large kitchens and in old people's homes.
  • the essence of the invention is that the change over time in the resistance of two temperature sensors is evaluated electronically.
  • One sensor is a conductor track applied to the underside of the ceramic plate, the other sensor is the resistance of the ceramic field at the hot point between two conductor tracks.
  • This takes advantage of the fact that temperature profiles during heating and cooking have very characteristic properties. These are electronically detected and fed to a computer.
  • This calculator also processes the pot size measurement and the measurement of the centricity of the pots on the ceramic plate. With defined threshold values, if one or the other limit value is exceeded, either the temperature is lowered or the hob or the hob is switched off.
  • the two middle interconnects 2a and 2b have a double function here. On the one hand, they consist of a conductive material with a high temperature coefficient. A measurement of the temperature can be determined by measuring the resistance. This temperature measurement, for example between the two end points of the electrode 2a, indicates approximately the average temperature under the hotplate. The temperature in the saucepan will of course lag behind this temperature if you have not just reached a steady state equilibrium. A second type of temperature measurement results from the resistance of the glass ceramic between the two electrodes 2a and 2b.
  • the ceramic plate gets too hot, the corresponding heating switches off. It is also provided that if the temperature measurement leads too much - with the ceramic material between electrodes 2a and 2b and the temperature measurement with one of the metallic conductors 2a or 2b - which indicates poor cookware with increased energy consumption, optical signaling (eco signal) for the user.
  • the position and size of the pot on the hob is recognized.
  • the heating process is not started at all due to a detected asymmetry. For example, an error message, supported by an acoustic warning, can be output.
  • the heating remains interrupted until the pot is placed on the hob to some extent symmetrically. Then the heating is switched on with more or less power depending on the recognized pot size.
  • the capacity measurement allows a fine adjustment with at least four levels.
  • the capacitive measurement can also determine whether there is any content in the pot or not. If there is no content in the pot, this also leads to a shutdown.
  • Another possibility of content recognition also with metal pots is the measurement of the temperature curve during the heating process. Filled pots have a slower temperature rise than full ones.
  • One of the hotplates is in operation on the glass ceramic hob 5 and its hottest temperature is measured as the resistance of the ceramic material between the electrodes 2a and 2b.
  • the temperature detection 6 takes place (FIG. 2) by means of resistance measurement and leads to a measured value of the temperature ⁇ , from which the first derivative of the temperature (FIG. 3) is formed over time using a difference method.
  • This gradient value is compared in logic unit 8 with a limit value. If the slope (at constant power) is greater than the preselected limit, it remains that 100% heating power continues to be applied to the hob. If the increase value falls below the limit value, the temperature value ⁇ s at which the limit value is undershot is stored in a memory 9 in the computer. This temperature means that the boiling point has been reached.
  • the true temperature of the ceramic plate below the pot can vary between 250 and 400 ° C.
  • the temperature ⁇ s on the underside of the cooktop is fed to a controller as the target temperature.
  • the heating power is reduced accordingly.
  • Typical are 20 - 50% power, which the pot assigns due to its properties by the temperature controller.
  • Typical are about 30 - 40% of the performance, which the pot has been awarded due to its degree of filling.
  • a “melting” function can also be selected using a single-button operation. It is not a temperature of the boiling point that is specified, but a temperature that can be specified individually in the range of approx. 70 - 90 ° C.
  • Another function would be "steaming", which corresponds to cooking, only after briefly boiling the temperature is immediately lowered to about 5 - 10 ° C below the boiling point.
  • a target temperature is also specified for roasting.
  • the heating output is adapted to the amount of roast and regulated.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)
  • Control Of Resistance Heating (AREA)
EP94116526A 1993-10-28 1994-10-20 Méthode pour commander la puissance de chauffage d'une plaque vitro-céramique selon les conditions de cuisson requises Expired - Lifetime EP0652688B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4336752A DE4336752C2 (de) 1993-10-28 1993-10-28 Verfahren zum Zubereiten von Speisen in einem Kochgeschirr auf einem Kochfeld aus Keramik, insbesondere Glaskeramik
DE4336752 1993-10-28

Publications (2)

Publication Number Publication Date
EP0652688A1 true EP0652688A1 (fr) 1995-05-10
EP0652688B1 EP0652688B1 (fr) 2002-03-27

Family

ID=6501198

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94116526A Expired - Lifetime EP0652688B1 (fr) 1993-10-28 1994-10-20 Méthode pour commander la puissance de chauffage d'une plaque vitro-céramique selon les conditions de cuisson requises

Country Status (2)

Country Link
EP (1) EP0652688B1 (fr)
DE (3) DE4345472C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1028602A2 (fr) * 1999-02-13 2000-08-16 Schott Glas Procédé de reconnaissance d'une cuisson à vide d'un élément de vaisselle placé sur des plaques possédant une surface de cuisson vitro-céramique ainsi que le dispositif correspondant
EP1087640A2 (fr) * 1999-09-22 2001-03-28 Diehl AKO Stiftung & Co. KG Dispositif de reconnaissance de présence et/ou de taille d'un pot
EP0806887B1 (fr) * 1996-05-11 2004-05-19 AEG Hausgeräte GmbH Procédé et dispositif pour reconnaítre le stade de cuisson d'aliments à cuire
EP1489479A1 (fr) * 2003-06-16 2004-12-22 Ceramaspeed Limited Appareil et méthode pour la détection de montée anormale en température dans un appareil de cuisson
CN104460758A (zh) * 2014-10-20 2015-03-25 上海电机学院 一种带有并联输入容错功能的嵌入式温控仪

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19643714C2 (de) * 1995-12-23 2001-01-25 Aeg Hausgeraete Gmbh Vorrichtung zum Regeln des Garvorgangs von zu garendem Gut
EP0788292B1 (fr) * 1996-02-02 2002-01-23 AEG Hausgeräte GmbH Plague de cuisson avec réglage automatique
DE19646826C5 (de) * 1996-02-22 2008-10-16 AEG Hausgeräte GmbH Vorrichtung zur Temperaturmessung an Kochstellen
DE19758873B4 (de) * 1996-03-02 2008-11-06 AEG Hausgeräte GmbH Vorrichtung und Verfahren zur Steuerung oder Regelung der Temperatur von beheizten Flächen
DE19617319A1 (de) * 1996-04-19 1997-10-23 Inter Control Koehler Hermann Verfahren sowie Einrichtung zur Regelung der Heizenergie einer Heizeinheit
EP0806886B1 (fr) * 1996-05-11 2005-01-26 AEG Hausgeräte GmbH Procédé et dispositif pour la thermométrie à un réchaud avec un capteur à piste conductive de température
DE19643698C2 (de) * 1996-05-11 2000-04-13 Aeg Hausgeraete Gmbh Vorrichtung zur Abschirmung von für kapazitive Messungen verwendeten Leiterbahnen eines Kochfeldes
GB2325533B (en) * 1997-05-22 2001-08-08 Ceramaspeed Ltd Method and apparatus for controlling an electric heater
DE10122427A1 (de) * 2001-05-09 2002-11-14 Bsh Bosch Siemens Hausgeraete Verfahren und Vorrichtung zur Begrenzung und/oder Steuerung der Oberflächentemperatur eines Kochfelds
DE102009001740B4 (de) * 2009-03-23 2013-10-31 BSH Bosch und Siemens Hausgeräte GmbH Hausgerätvorrichtung
DE102010064294A1 (de) * 2010-12-29 2012-07-05 BSH Bosch und Siemens Hausgeräte GmbH Kochfeld und Verfahren zur Steuerung einer Energiezufuhr an ein Heizelement eines Kochfeldes
EP2741570B1 (fr) * 2012-12-04 2016-04-06 Electrolux Home Products Corporation N.V. Procédé et unité de commande pour commander un processus de cuisson sur une table de cuisson par induction
ES2619112B1 (es) * 2015-12-22 2018-04-10 Bsh Electrodomésticos España, S.A. Dispositivo de campo de cocción por inducción con al menos una unidad sensora capacitiva
EP3914862A1 (fr) 2019-01-23 2021-12-01 GORENJE gospodinjski aparati, d.d. Dispositif de détection de caractéristiques de récipient de cuisson et procédé de détection de caractéristiques de récipient de cuisson

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138659A (en) * 1980-01-14 1984-10-24 Johnson Matthey Plc Glass Ceramic Hob including Temperature Sensor
EP0155546A2 (fr) * 1984-03-05 1985-09-25 General Electric Company Dispositif de régulation du courant pour un réchaud électrique automatique
DE3530403A1 (de) * 1985-04-06 1986-10-16 Philips Patentverwaltung Verfahren zum automatischen regeln des ankochheizvorganges einer kochvorrichtung
DE3744372A1 (de) * 1987-01-05 1988-07-14 Gen Electric Leistungssteueranordnung und -verfahren fuer ein glaskeramikkochfeld
DE3811925C1 (fr) * 1988-04-09 1989-03-02 Kurt Wolf & Co Kg, 7547 Wildbad, De
DE3736005A1 (de) * 1987-10-23 1989-05-03 Bosch Siemens Hausgeraete Steuereinheit fuer elektronische kochstellen-temperaturregelung mit temperatursensor
EP0429120A2 (fr) * 1989-11-17 1991-05-29 Whirlpool Europe B.V. Dispositif pour déterminer l'existance d'une casserole sur une plaque de cuisson
EP0467134A2 (fr) * 1990-07-18 1992-01-22 Schott Glaswerke Procédé et appareil pour indiquer un état de charge anormal thermique d'un panneau chauffé

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2139828C3 (de) * 1971-08-09 1974-02-14 Jenaer Glaswerk Schott & Gen., 6500 Mainz Temperaturmeßwiderstand mit großer Temperaturwechselbeständigkeit aus Glaskeramik
US4237368A (en) * 1978-06-02 1980-12-02 General Electric Company Temperature sensor for glass-ceramic cooktop
US4465228A (en) * 1981-09-09 1984-08-14 Matsushita Electric Industrial Co., Ltd. Cooker with heating control system
DE3314501A1 (de) * 1983-04-21 1984-10-25 Ego Elektro Blanc & Fischer Heizelement, insbesondere strahlungs-heizelement fuer die beheizung von glaskeramikplatten
DE3639186A1 (de) * 1986-11-15 1988-05-26 Ego Elektro Blanc & Fischer Elektro-schaltgeraet, insbesondere zur leistungssteuerung
DE3843460A1 (de) * 1988-12-23 1990-06-28 Klaschka Ind Elektronik Kochfeld
US5026971A (en) * 1990-01-08 1991-06-25 General Electric Company Temperature control system for a heating oven using a glass-ceramic temperature sensor
DE4022846C2 (de) * 1990-07-18 1994-08-11 Schott Glaswerke Vorrichtung zur Leistungssteuerung und -begrenzung bei einer Heizfläche aus Glaskeramik oder einem vergleichbaren Material

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138659A (en) * 1980-01-14 1984-10-24 Johnson Matthey Plc Glass Ceramic Hob including Temperature Sensor
EP0155546A2 (fr) * 1984-03-05 1985-09-25 General Electric Company Dispositif de régulation du courant pour un réchaud électrique automatique
DE3530403A1 (de) * 1985-04-06 1986-10-16 Philips Patentverwaltung Verfahren zum automatischen regeln des ankochheizvorganges einer kochvorrichtung
DE3744372A1 (de) * 1987-01-05 1988-07-14 Gen Electric Leistungssteueranordnung und -verfahren fuer ein glaskeramikkochfeld
DE3736005A1 (de) * 1987-10-23 1989-05-03 Bosch Siemens Hausgeraete Steuereinheit fuer elektronische kochstellen-temperaturregelung mit temperatursensor
DE3811925C1 (fr) * 1988-04-09 1989-03-02 Kurt Wolf & Co Kg, 7547 Wildbad, De
EP0429120A2 (fr) * 1989-11-17 1991-05-29 Whirlpool Europe B.V. Dispositif pour déterminer l'existance d'une casserole sur une plaque de cuisson
EP0467134A2 (fr) * 1990-07-18 1992-01-22 Schott Glaswerke Procédé et appareil pour indiquer un état de charge anormal thermique d'un panneau chauffé

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0806887B1 (fr) * 1996-05-11 2004-05-19 AEG Hausgeräte GmbH Procédé et dispositif pour reconnaítre le stade de cuisson d'aliments à cuire
EP1028602A2 (fr) * 1999-02-13 2000-08-16 Schott Glas Procédé de reconnaissance d'une cuisson à vide d'un élément de vaisselle placé sur des plaques possédant une surface de cuisson vitro-céramique ainsi que le dispositif correspondant
EP1028602A3 (fr) * 1999-02-13 2002-01-02 Schott Glas Procédé de reconnaissance d'une cuisson à vide d'un élément de vaisselle placé sur des plaques possédant une surface de cuisson vitro-céramique ainsi que le dispositif correspondant
EP1087640A2 (fr) * 1999-09-22 2001-03-28 Diehl AKO Stiftung & Co. KG Dispositif de reconnaissance de présence et/ou de taille d'un pot
EP1087640A3 (fr) * 1999-09-22 2003-09-17 Diehl AKO Stiftung & Co. KG Dispositif de reconnaissance de présence et/ou de taille d'un pot
EP1489479A1 (fr) * 2003-06-16 2004-12-22 Ceramaspeed Limited Appareil et méthode pour la détection de montée anormale en température dans un appareil de cuisson
US7105781B2 (en) 2003-06-16 2006-09-12 Ceramaspeed Limited Apparatus and method for detecting abnormal temperature rise associated with a cooking arrangement
CN104460758A (zh) * 2014-10-20 2015-03-25 上海电机学院 一种带有并联输入容错功能的嵌入式温控仪
CN104460758B (zh) * 2014-10-20 2016-11-16 上海电机学院 一种带有并联输入容错功能的嵌入式温控仪

Also Published As

Publication number Publication date
EP0652688B1 (fr) 2002-03-27
DE4336752C2 (de) 1999-06-24
DE4336752A1 (de) 1995-05-04
DE59410088D1 (de) 2002-05-02
DE4345472C2 (de) 2001-05-10

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