EP1492385A2 - Méthode et dispositif de reconnaissance de processus de chauffage - Google Patents

Méthode et dispositif de reconnaissance de processus de chauffage Download PDF

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Publication number
EP1492385A2
EP1492385A2 EP04013591A EP04013591A EP1492385A2 EP 1492385 A2 EP1492385 A2 EP 1492385A2 EP 04013591 A EP04013591 A EP 04013591A EP 04013591 A EP04013591 A EP 04013591A EP 1492385 A2 EP1492385 A2 EP 1492385A2
Authority
EP
European Patent Office
Prior art keywords
gradient
heating process
energy supply
heating
evaluation
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.)
Granted
Application number
EP04013591A
Other languages
German (de)
English (en)
Other versions
EP1492385B1 (fr
EP1492385A3 (fr
Inventor
Martin Baier
Wolfgang Wittenhagen
Ralf Dr. Dorwarth
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Publication of EP1492385A2 publication Critical patent/EP1492385A2/fr
Publication of EP1492385A3 publication Critical patent/EP1492385A3/fr
Application granted granted Critical
Publication of EP1492385B1 publication Critical patent/EP1492385B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/04—Heating plates with overheat protection means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a method for detecting heating processes in a hotplate or a hob according to the preamble of patent claim 1 and a device according to the preamble of patent claim 10.
  • US Pat. No. 6,469,282 B1 discloses a method and a device for the detection of disturbed heating processes in a hob, in which an evaluation of a power consumption of the heating element is carried out in order to detect a disturbed heating process, in particular a dry heating process, during operation with limited power. Dry cooking is recognized by a sharp drop in the power consumption of the heating element and the associated signal. If the hob is not operated in a power limitation mode, a faulty heating process is also recognized by evaluating a temperature signal. Such a disturbed heating process is recognized when there is a sharp rise in the temperature signal.
  • DE 101 22 427 A1 discloses a method and a device for detecting controlled heating processes in a hob, for detecting a disturbed heating process, in particular an empty heating process, in which there is no pot on the hob.
  • a faulty heating process is recognized in an output limitation operation by evaluating a switching temperature-time profile, which is compared with stored switching temperature-time profiles.
  • One of the stored switching temperature-time profiles corresponds to a switching temperature-time profile of an empty cooking process.
  • US Pat. No. 6,384,384 B1 discloses a method and a device for detecting disturbed heating processes in a hob, in which an evaluation of a heating element's power consumption is carried out in order to detect a disturbed heating process, in particular a dry heating process, in operation with limited power. Dry cooking is recognized by a sharp drop in the power consumption of the heating element and the associated signal.
  • a first and a second derivative of the power consumption signal are determined and evaluated.
  • a faulty heating process is recognized when the evaluation of the first and the second derivative indicate a sharp drop in the power consumption signal.
  • a faulty heating process is also recognized by evaluating a temperature signal. Such a disturbed heating process is recognized when the first and second derivatives of the temperature signal indicate a sharp rise in the temperature signal.
  • the object of the invention is to provide a method for determining heating processes and an apparatus for carrying out the method, which are simple in structure and with which faulty heating processes can be reliably detected even in a power limitation operating mode.
  • the main idea of the invention is to evaluate a temperature profile of a cover of heating devices or a temperature profile of a hotplate or a hob to determine heating processes. This is done when the energy supply to at least one heating element is reduced or has ended, in particular in each case after an interval. For this purpose, a gradient of the temperature profile, in particular in the sinking area, is determined. A normal heating process is recognized in the evaluation if the gradient is greater than a predetermined threshold value. If the gradient is less than or equal to a predetermined threshold value, a disturbed heating process or operation is recognized during the evaluation.
  • the energy supply to the at least one heating element is interrupted when a predetermined temperature of the cover and / or after predetermined time intervals is reached. Time intervals in which energy is supplied to the heating element and time intervals in which no energy is supplied to the heating element alternate. The time intervals can be related to each other as when clocking radiant heaters.
  • the predefined temperature can be a maximum temperature with which the cover can be loaded and / or a temperature which is predefined by a controller as a function of a user input.
  • the evaluation of the temperature profile after switching off the energy supply or after the end of an interval to the heating element is based on the idea that a cooking vessel arranged on the cover continues to draw energy from the cover for a cooking process even when the energy supply is switched off. This process causes a drop in the temperature of the cover, which can be evaluated. If the waste is large, it can be concluded that there is still food to be cooked in the cooking vessel, since both still absorb a lot of energy together. If the waste is small, it can be concluded that there is little or no food to be cooked in the cooking vessel and that the cooking vessel therefore absorbs little or no energy.
  • a normal heating process can be distinguished from a faulty heating process. No further components are required for this, such as an assembly for determining the power consumption.
  • the type of curve of the temperature drop is approximately known.
  • it can correspond to a decaying e-function. If this is theoretically generally known, the concrete curve function can be concluded from two points, and thus also a further course. From the specific course of the curve or the function of the course, parameters of the decay process, such as time constants or the like, can again be inferred. These provide information about the type of decay process and thus the condition of the cover or the cooking vessel on top.
  • an alarm is triggered or the energy supply is reduced and / or switched off after a detected faulty heating process.
  • the currently determined gradient is compared with an earlier gradient determined at an earlier point in time.
  • a first heating process is recognized in which the cooking vessel with the food still has a great deal to do Absorbs energy. It can be concluded from this that the food is not yet cooking.
  • a plurality of points of the temperature profile are preferably measured and evaluated at time intervals. For example, a first point is measured shortly after the end of the energy supply interval and a second point shortly before the energy supply starts again.
  • An essential advantage of the method according to the invention is that no information or storage of absolute temperature values is necessary to differentiate the different heating processes.
  • the method only evaluates the tendency to "strong” or “weak” drop in the temperature profile during the heating breaks. These are the time intervals in which no energy is supplied to the heating.
  • the device according to the invention for the detection of heating processes in a hotplate or a cooktop comprises a cover and a heater arranged under the cover for supplying energy to a cooking vessel which is arranged on the cover. Furthermore, an energy source can be provided for the energy supply to the heating, which is controlled by a controller.
  • a temperature sensor measures a temperature profile of the cover during a heating process.
  • the controller is designed to evaluate the measured temperature profile in such a way that it evaluates the temperature profile after the energy supply has ended. For evaluation, it determines a gradient of the temperature profile. As described above, the evaluation detects a normal heating process if the gradient is greater than a predetermined threshold value. If the gradient is less than or equal to a predetermined threshold value, a disturbed heating process is recognized during the evaluation.
  • an alarm device can be provided which can be activated by the control system after a detected faulty heating process.
  • the control can reduce and / or switch off the energy supply after a detected faulty heating process.
  • the temperature sensor can advantageously be arranged on that side of the cover on which the heater is attached. The temperature sensor can also be attached directly to the cover or can rest on it.
  • the device according to the invention for detecting heating processes comprises a glass ceramic cooktop 1 for a hotplate or a cooktop, a controller 2, a temperature sensor 3, an energy source 4, a heater 7 and an operating device 5.
  • the energy source 4 becomes controlled by the controller 2 and feeds the glass ceramic cooktop 1 via the heater 7 energy which is transferred to a cooking vessel 6.
  • This energy supply is clocked, preferably with a predetermined power and with essentially fixed cycle times, which are dependent on the level of the energy supply selected, for example as a cooking level.
  • the temperature sensor 3 measures a temperature profile of the cover 1 during a cooking process, the controller 2 evaluating the measured temperature profile.
  • the temperature sensor 3 is attached to that side of the cover 1 on which the heater 7 is arranged.
  • the controller 2 determines a gradient G N of the temperature profile with the above-described requirements and possibilities for evaluation after the end of the energy supply.
  • a temperature profile of a cover of the hotplate or the hob is determined in step 100 via a temperature measurement carried out by a temperature sensor 3 .
  • points of the temperature profile are preferably measured at time intervals.
  • step 200 a termination of an energy supply interval for a heating element 3 is determined, for example because the hob has reached a predetermined temperature or because a predetermined time interval for the energy supply has expired. Then, in step 300, a drop in the hob temperature as a result of the end of the energy supply being determined as the current gradient G N. Several measured points of the temperature profile are used to determine the gradient G N. Two points are preferably used, one being measured shortly after the end of the energy supply and one shortly before the restart of the energy supply.
  • step 400 the current gradient G N is compared with a predetermined target value. If the current gradient G N is less than or equal to the specified target value, then a faulty heating process is recognized.
  • the setpoint can also be a gradient G N-1 determined earlier.
  • the disturbed heating process corresponds in the illustrated embodiment to a dry heating process, ie a cooking vessel 6 absorbs little energy and the food in the cooking vessel 6 is almost completely overcooked. An alarm is then triggered in step 500 and / or the energy supply is reduced and / or the energy source 4 is switched off.
  • step 400 If it is determined in step 400 that the current gradient G N of the temperature profile is greater than the predetermined threshold value, then the type of a current normal heating process is determined in steps 600 to 640, in that the current gradient G N with that at an earlier termination of the Energy supply determined gradient G N-1 is compared.
  • step 600 If the comparison in step 600 shows that the current gradient G N is greater than the previous gradient G N-1 , then a first heating process 610 is recognized. In this, the food to be cooked in the cooking vessel 4 is not yet fully cooked, since the cooking vessel 4 still absorbs a great deal of energy from the hob 1 with the food to be cooked, and the process begins again. If the current gradient G N is not greater than the previous gradient G N-1 , then the process continues with step 620.
  • step 620 If the comparison in step 620 shows that the current gradient G N and the former gradient G N-1 are the same, then a second heating process is recognized in which the food to be cooked 630. This is because the energy consumption of the cooking vessel with the food to be cooked is almost the same size over a longer period of time. The process begins anew.
  • step 640 If the two gradients G N and G N-1 are not the same size, then it is determined in step 640 that the current gradient G N is smaller than the previous gradient G N-1 .
  • a third heating process is recognized, in which the food to be cooked boils in the cooking vessel 6, since the cooking vessel 6 also absorbs little energy from the food. Then the process begins again. This step is omitted if the previous gradient G N-1 is used as the predetermined threshold value.
  • FIG. 3 shows a diagram in which different temperature profiles are shown over time.
  • the temperature of the food to be cooked is shown as a solid curve.
  • the temperature of the base of the pot is shown in dotted lines.
  • the dash-dotted jagged curve corresponds approximately to the temperature of the hob and the dotted jagged curve corresponds approximately to the temperature of the heating.
  • the representation should not be taken for the absolute temperatures, but above all shows the schematic course.
  • the horizontal dash-dotted line is the temperature T which the food reaches after a while. In the case of water as food, this is 100 ° C. Furthermore, rectangles indicated by dashed lines are drawn in with the same time intervals. These represent the operation of a heater, for example a radiant heater. This means that in the exemplary embodiment shown, a heater with cycle operation and alternation between no power and full power and regular cycle operation is used.
  • the temperature of the heating will rise very strongly during a cycle or heating period, as will that of the hob.
  • the temperature of the bottom of the pan rises more slowly and that of the food to be cooked even more slowly.
  • the temperatures of the heating no longer rise and those of the hob only increase just a little further on.
  • the temperature profile of the bottom of the pot flattens out, while the temperature profile of the food remains essentially unaffected.
  • the temperature curves of the heating and hob drop significantly, while the temperature of the bottom of the pan rises slightly, as does that of the food.
  • the temperatures of the heating and hob rise again quickly and steeply.
  • the bottom of the pot rises slightly flatter.
  • the temperature of the food increases even more gently. It can generally be said about the temperature of the food to be cooked that it rises substantially uniformly over the course of the entire heating process over time, in particular independently of the heating intervals.
  • the picture is essentially the same as after the end of the first heating interval. This also applies to the following heating intervals.
  • the respective slope can be calculated from the size of the drop in the curve of the hob temperature. From this in turn, conclusions can be drawn about the curve as a whole. By further comparison, it can be said whether these differences or difference values are still within a predetermined range.
  • the pot bottom temperature could rise again or rise above 100 ° C, especially when heating or boiling with water. At the same time, this would mean that the empty pot can absorb less heat from the heating and the hob. As a result, their temperatures continue to rise in absolute terms.
  • the curve sections in which the curves drop during a non-heated time are much flatter because less energy is consumed and the hob temperature drops less.
  • a complete avoidance of the sink temperature dropping during an unheated time is of course technically and physically hardly possible. However, the temperature difference would be significantly smaller.
  • the alarm is triggered at the time t n + 1 , since the gradient of the temperature profile in the time interval T N1 between the times t n + 1 and t n + 2 is less than at the previous time intervals after the end of the energy supply.
  • the energy supply is clock-controlled.
  • the control of the time intervals for energy supply and the time intervals without energy supply is carried out by the controller 2 via a clock signal.
  • the two intervals are of equal length. This could also be different, depending on the selected performance level.
  • the control ends the energy supply when the hob temperature reaches a predetermined temperature value. The energy supply is reactivated at the next switch-on time.
  • the off time can also be extended once with a certain timing, that is not every time. This extension should be until the off time is long enough for the temperature to drop.
  • the predefined temperature value is, for example, a maximum possible temperature value. This can be specified to protect the cover from permanent damage. Or it can be a temperature value specified by a user via a control panel 5.
  • the exemplary embodiment shown comprises an alarm device, not shown, which is activated by the control system after a detected faulty heating process.
  • the control system is arranged in the operating device as an acoustic alarm device.
  • control in the exemplary embodiment shown switches off the energy supply from the energy source after a detected faulty heating process.
  • control reduces the energy supply even before the predetermined threshold value is reached if the current gradient G N decreases compared to an earlier gradient G N-1 .
  • the predetermined threshold value corresponds to the gradient G N-1 determined earlier, as already stated.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)
  • General Induction Heating (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
EP04013591A 2003-06-27 2004-06-09 Méthode et dispositif de reconnaissance de processus de chauffage Expired - Lifetime EP1492385B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10329840A DE10329840A1 (de) 2003-06-27 2003-06-27 Verfahren und Vorrichtung zur Erkennung von Erwärmungsvorgängen
DE10329840 2003-06-27

Publications (3)

Publication Number Publication Date
EP1492385A2 true EP1492385A2 (fr) 2004-12-29
EP1492385A3 EP1492385A3 (fr) 2006-05-17
EP1492385B1 EP1492385B1 (fr) 2009-07-29

Family

ID=33395061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04013591A Expired - Lifetime EP1492385B1 (fr) 2003-06-27 2004-06-09 Méthode et dispositif de reconnaissance de processus de chauffage

Country Status (5)

Country Link
US (1) US6888110B2 (fr)
EP (1) EP1492385B1 (fr)
AT (1) ATE438281T1 (fr)
DE (2) DE10329840A1 (fr)
ES (1) ES2330631T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1768461A1 (fr) * 2005-09-22 2007-03-28 E.G.O. ELEKTRO-GERÄTEBAU GmbH Méthode pour générer, traiter et évaluer un signal en correlation avec la température, et dispositif correspondant
WO2008064898A1 (fr) * 2006-12-01 2008-06-05 E.G.O. Elektro-Gerätebau GmbH Procédé de production, de traitement et d'évaluation d'un signal en corrélation avec la température, et dispositif correspondant
EP2741570A1 (fr) * 2012-12-04 2014-06-11 Electrolux Home Products Corporation N.V. Procédé et unité de commande pour commander un processus de cuisson sur une table de cuisson par induction
US20170074744A1 (en) * 2015-09-16 2017-03-16 Central Research Institute Of Electric Power Industry Method and Apparatus for Detecting Gas Leakage From Radioactive Material Sealed Container
EP3307019A1 (fr) * 2016-10-10 2018-04-11 E.G.O. ELEKTRO-GERÄTEBAU GmbH Procédé de fonctionnement d'un champ de cuisson à induction et champ de cuisson à induction

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
DE102005050862B3 (de) * 2005-10-24 2007-05-03 Webasto Ag Verfahren zum Steuern eines motorunabhängigen Heizgeräts, Steuereinrichtung für ein motorunabhängiges Heizgerät, Heizgerät und Heizsystem
DE102008008604A1 (de) * 2008-02-12 2009-08-13 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät mit mindestens einer Kochstelle
DE102008053064B3 (de) * 2008-10-24 2010-04-01 Hüttinger Elektronik Gmbh + Co. Kg Verfahren zur Temperaturüberwachung
US20180177324A1 (en) * 2009-05-21 2018-06-28 Brian Powell Egg cooking utensil
WO2013059632A1 (fr) * 2011-10-19 2013-04-25 John Rankin Procédé permettant une mesure indirecte de la température des aliments

Citations (3)

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Publication number Priority date Publication date Assignee Title
US6384384B1 (en) * 2000-07-28 2002-05-07 General Electric Company Boil dry detection in cooking appliances
US6469282B1 (en) * 2000-07-28 2002-10-22 General Electric Company Boil dry detection in cooking appliances
DE10122427A1 (de) * 2001-05-09 2002-11-14 Bsh Bosch Siemens Hausgeraete Verfahren und Vorrichtung zur Begrenzung und/oder Steuerung der Oberflächentemperatur eines Kochfelds

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US4816647A (en) * 1987-11-13 1989-03-28 General Electric Company Power control for appliance having a glass ceramic cooking surface
FR2652172B1 (fr) * 1989-09-15 1996-06-28 Europ Equip Menager Dispositif et procede de regulation d'appareil de cuisson.
AU1064195A (en) * 1993-12-06 1995-06-27 Aktiebolaget Electrolux An apparatus for controlling the operating temperature of a cooking zone
US5711606A (en) * 1995-10-27 1998-01-27 Technology Licensing Corporation Diagnostic system for a cooking appliance
DE19544652A1 (de) * 1995-11-30 1997-06-05 Ako Werke Gmbh & Co Leistungs-Regeleinrichtung für eine Strahlungsbeheizung
EP0806887B1 (fr) * 1996-05-11 2004-05-19 AEG Hausgeräte GmbH Procédé et dispositif pour reconnaítre le stade de cuisson d'aliments à cuire
DE19643698C2 (de) * 1996-05-11 2000-04-13 Aeg Hausgeraete Gmbh Vorrichtung zur Abschirmung von für kapazitive Messungen verwendeten Leiterbahnen eines Kochfeldes
DE19906115C1 (de) * 1999-02-13 2000-08-31 Schott Glas Verfahren zum Erkennen des Leerkochens von Geschirr bei Kochfeldern mit einer Glaskeramik-Kochfläche und zugehörige Vorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6384384B1 (en) * 2000-07-28 2002-05-07 General Electric Company Boil dry detection in cooking appliances
US6469282B1 (en) * 2000-07-28 2002-10-22 General Electric Company Boil dry detection in cooking appliances
DE10122427A1 (de) * 2001-05-09 2002-11-14 Bsh Bosch Siemens Hausgeraete Verfahren und Vorrichtung zur Begrenzung und/oder Steuerung der Oberflächentemperatur eines Kochfelds

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1768461A1 (fr) * 2005-09-22 2007-03-28 E.G.O. ELEKTRO-GERÄTEBAU GmbH Méthode pour générer, traiter et évaluer un signal en correlation avec la température, et dispositif correspondant
WO2008064898A1 (fr) * 2006-12-01 2008-06-05 E.G.O. Elektro-Gerätebau GmbH Procédé de production, de traitement et d'évaluation d'un signal en corrélation avec la température, et dispositif correspondant
EP2741570A1 (fr) * 2012-12-04 2014-06-11 Electrolux Home Products Corporation N.V. Procédé et unité de commande pour commander un processus de cuisson sur une table de cuisson par induction
US9549437B2 (en) 2012-12-04 2017-01-17 Electrolux Home Products Corporation N.V. Method and a control unit for controlling a cooking process on an induction cooking hob
US20170074744A1 (en) * 2015-09-16 2017-03-16 Central Research Institute Of Electric Power Industry Method and Apparatus for Detecting Gas Leakage From Radioactive Material Sealed Container
US10119881B2 (en) * 2015-09-16 2018-11-06 Central Research Institute Of Electric Power Industry Method and apparatus for detecting gas leakage from radioactive material sealed container
EP3307019A1 (fr) * 2016-10-10 2018-04-11 E.G.O. ELEKTRO-GERÄTEBAU GmbH Procédé de fonctionnement d'un champ de cuisson à induction et champ de cuisson à induction
US10820381B2 (en) 2016-10-10 2020-10-27 E.G.O. Elektro-Geraetebau Gmbh Method for operating an induction hob, and induction hob

Also Published As

Publication number Publication date
US20040262292A1 (en) 2004-12-30
EP1492385B1 (fr) 2009-07-29
US6888110B2 (en) 2005-05-03
DE502004009808D1 (de) 2009-09-10
ES2330631T3 (es) 2009-12-14
EP1492385A3 (fr) 2006-05-17
DE10329840A1 (de) 2005-01-20
ATE438281T1 (de) 2009-08-15

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