EP1028602A2 - 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 - Google Patents

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 Download PDF

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Publication number
EP1028602A2
EP1028602A2 EP99125600A EP99125600A EP1028602A2 EP 1028602 A2 EP1028602 A2 EP 1028602A2 EP 99125600 A EP99125600 A EP 99125600A EP 99125600 A EP99125600 A EP 99125600A EP 1028602 A2 EP1028602 A2 EP 1028602A2
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EP
European Patent Office
Prior art keywords
temperature
signal
switch
control
regulating
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
EP99125600A
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German (de)
English (en)
Other versions
EP1028602A3 (fr
EP1028602B1 (fr
Inventor
Harry Engelmann
Kurt Dr. Schaupert
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.)
Schott AG
Original Assignee
Carl Zeiss AG
Schott Glaswerke AG
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Publication date
Application filed by Carl Zeiss AG, Schott Glaswerke AG filed Critical Carl Zeiss AG
Publication of EP1028602A2 publication Critical patent/EP1028602A2/fr
Publication of EP1028602A3 publication Critical patent/EP1028602A3/fr
Application granted granted Critical
Publication of EP1028602B1 publication Critical patent/EP1028602B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 the empty cooking of Dishes on hobs with a glass ceramic hob that are at least has a cooking zone, which is associated with a radiator, the Energy supply is set via regulating and control organs, and in which the temperature or a quantity derived from it as a signal (Temperature signal) recorded operationally and by means of a Protection temperature limiter limited with adjustable switch-off temperature becomes.
  • the invention further relates to an apparatus for performing this Procedure.
  • the surface temperature of the cooking zones of cooktops is included Glass ceramic cooktops typically by means of rod-shaped, mechanical Protective temperature limiters monitored. These measure the average temperature below the cooking zone and limit it.
  • the shutdown temperature, too Switching threshold is usually based on the properties of the used dishes and glass ceramics.
  • one electronic temperature limitation is known. However, this will only modeled the behavior of the mechanical protective temperature limiter, there is no further evaluation of the temperature information.
  • US 4,493,981 describes a method and a corresponding device to detect the empty cooking of dishes - there as a "Boil Dry Condition" designated - became known.
  • This method is used as an indicator of this state uses the first time derivative of the temperature. Exceeds If a limit value is reached, empty cooking is recognized. The limit is however depending on the type of cooking appliance and the current one Power setting. Empty cooked dishes are also recognized when the The temperature on the cookware exceeds a limit. This value too depends on the type of cooking appliance and the current one Power setting. If there is empty cooking, the user is warned or the device is switched off.
  • the invention is based on the object, the method described above to guide or train the associated device so that a safe Detection of the critical operating state of empty dishes regardless of the current power setting and also regardless of Cookware type and thus secure protection of the associated cooking zone this critical operating state is possible.
  • the individual temperature constellations are linked to each other because the Temperature of the cooking zone is not a constant variable, especially since the control and Control bodies can be operated at any time.
  • the link is therefore the Detection of the critical operating state according to an embodiment of the Invention made such that when the regulating and control elements are actuated in Forming the control signal for a sense of a reduction in the power supply predetermined period of time, preferably in the range of two minutes, deactivated and then it is checked whether the temperature is still at the Switch-off temperature is or has dropped so far that the case has been changed becomes that both time derivatives are positive, i.e. then there is one Temperature constellation with the corresponding signal formation conditions according to the first temperature constellation.
  • the regulating and control organs actuated, then according to an embodiment of the invention Switch-off temperature raised to the original value so that full power is available at high temperature.
  • the method is carried out so that the predetermined time interval for deactivating the formation of a control signal after actuation of the regulating and control organs in the area of two minutes lies.
  • the method performed so that the time derivative of the temperature signal a straight line through the previous temperature values and the difference from their extrapolation to the current temperature value, and that the second time derivative of the temperature signal from a straight line by the earlier values of the first time derivative and the difference of extrapolated to the current value of the first time derivative becomes.
  • the evaluation of the detection of the critical operating state can be based on done in different ways. In the simplest case, this state can be displayed are, however, advantageously combined with a warning that is audible or optically but also via remote effect (home bus). At a fully automated control is preferably directly the radiator switched off.
  • the above-described object is achieved with respect to the above-mentioned device for carrying out the above-mentioned methods, starting from a hob with a glass ceramic cooking surface which has at least one cooking zone to which a heating element is assigned, the energy supply of which can be adjusted via regulating and control elements which is attached to a temperature sensor that operationally detects the temperature of the cooking zone or a variable derived therefrom as a signal (temperature signal), and which is assigned a protective temperature limiter with adjustable switch-off temperature, according to the invention in that an electronic evaluation and control unit is provided which In addition to the temperature signal (T), signals about the switch-off temperature (T A ), the energy supply (E Z ) and an actuation (B R ) are fed to the regulating and control elements, and on the output side with the setting of the switch-off temperature of the protective temperature limiter, the regulating and control elements and is optionally connected to a display or warning unit, and which has a first comparison stage for comparing the cooking zone temperature with the switch-off temperature and which
  • the method according to the invention for detecting empty cooking of the dishes is based on the evaluation of the change in the heat flow and thus associated variables temperature and duty cycle of the cooking appliance and the from these two derived quantities.
  • the time course of the temperature in this area as well as the 1st and 2nd The time derivative of the values of the corresponding curve is shown in FIG. 1.
  • the temperature of the Hob After switching on, i.e. during parboiling, the temperature of the Hob to approach a saturation level that is out of balance between energy supply and energy dissipation through losses and evaporation is characterized by watery cookware (solid curve).
  • solid curve the temporal change (1st derivative) of the temperature increases according to the dotted curve first quickly to its maximum value, then slowly to sink.
  • the start-up phase of the first time derivative of the temperature arises from the heating of the radiator assigned to the cooking zone. After that, the 1st time derivative decreases because the temperature increases due to the as the temperature rises, losses become flatter.
  • the second Time derivation (dashed curve) is positive in the start-up phase, afterwards negative during further heating.
  • the second derivative in addition to the first derivative also positive, i.e. it lies same constellation of values as for empty cooking according to FIG. 2.
  • the user is obviously present, which is why the Detection of the critical operating state can be temporarily overridden can without compromising protection.
  • 2 minutes after one Activation of the control or regulating elements activates the detection again.
  • the second derivative positive after some time, as is the case in the diagram according to FIG. 3 is shown.
  • the first derivative is negative in this case, however this case can be distinguished as uncritical.
  • the power control of cooking zones is typically based on the status the technology by clocking the power supply.
  • the interval e.g. 40 s the ratio of switched on, i.e. current-carrying duration, to the total duration, varies.
  • This switching on and off leads to a periodic change in the glass ceramic temperature, which the long-term temperature change is superimposed.
  • the temperature in sync with clocking - e.g. always at the Switch-off edge - measured.
  • Performance practically continuous - e.g. through a pulse package control - set so that the temperature profile is continuously corresponding runs.
  • the accuracy of the temperature measurement also needs to be taken into account.
  • the temperature measurements are subject to fluctuations due to measurement inaccuracies and disturbances. Usually for Reducing these effects averaged several values. this means however, there is a delay in the detection of the empty dishes, since only several values must be available for averaging. Especially when clocking the Energy regulator at the typical rate of one cycle per 40 s is this Delay for the detection of the critical operating state cannot be tolerated.
  • the temperature of the glass ceramic can be determined directly.
  • the procedure can be even with a temperature-dependent variable, such as the sheet resistance of Sensors on the underside of the cooking surface according to DE 196 32 057 A1, perform successfully. It is advantageous here that the aging of the sensors Procedure not hindered, since only the time derivatives of the Resistance values are used. A temperature calibration of the sensors not necessary.
  • the operating state of empty cooking of the dishes is therefore the first Temperature range recognized as critical when both the first and second Time derivative of the temperature are positive without the control and Control organs to increase the Power supply have been confirmed.
  • this constellation is as follows 2nd temperature range described no longer exist.
  • the protective temperature limiter regulates in this temperature constellation constant temperature.
  • the poorer heat dissipation of the after cooking Systems then manifests itself in a reduced current duty cycle. It is then used as an indication of the critical operating state that the Current duty cycle is reduced, although the regulating and control elements are not were operated.
  • This method initially involves the detection of a temperature equilibrium state ahead. This condition is recognized when the Temperature changes only insignificantly over a long period of time. Is the temperature then just a little below the usual switch-off temperature of the Protection temperature limiter, its switch-off temperature is set to the current one Reduced temperature value.
  • FIG. 5 is an embodiment of a device for detecting the Cooking dishes empty in a cooktop with a glass ceramic hob 1, which has four cooking zones 2 in the exemplary embodiment.
  • Everyone Cooking zone 2 is assigned a radiator 3, for example an electric one operated radiant heater, the energy supply via a control stage 4, can be actuated via control elements 5, for example touch switches, rotary switches or the like, is adjustable.
  • Each cooking zone 2 is also a temperature sensor 6 assigned to directly the temperature in the cooking zone or one of them derived size recorded operationally.
  • Such temperature sensors for cooking zones are in various forms on the market or in the relevant Font, e.g. in DE 196 32 057 A1. The better overview for this reason, in Fig. 5 radiators and temperature sensors are only for one cooking zone shown.
  • the corresponding temperature signal T of the temperature sensor 6 is fed once to the control stage 4 as the actual value for the usual temperature control of the cooking zone.
  • a protective temperature limiter 7 with an adjustable switch-off temperature T A here in an electronic version, which is also connected to control stage 4.
  • This protective temperature limiter 7 limits the temperature in the cooking zone to the value of the switch-off temperature T A , also referred to as the switching threshold.
  • Such protective temperature limiters with adjustable switch-off temperature are also known.
  • the evaluation and control unit 8 acts with its output A1 on the protective temperature limiter 7 with regard to the specification of the switch-off temperature T A and it is also connected via the output A2 to the control stage 4 in order to be able to switch it off in a critical operating state.
  • Steps to detect empty cooking on dishes on cooking zones 2 is set up, carried out.
  • Linking the steps and the created ones 6 is again in the form of a conventional flow chart for the signals individual program steps, which also shows the relationships for the three temperature constellations described above. Based on the detailed description of the procedural steps in the individual Temperature constellations and their inner connection needs on this Place the flowchart of FIG. 6 no longer described in detail become. The following comments should suffice:
  • the temperature information T A is stored in the evaluation and control unit 8 in order to calculate the best-fit line through the last 5 measuring points and the extrapolation to the current time in accordance with FIG. 4. If an approximately constant temperature in the range within 40K of the switching threshold of the protective temperature limiter 7 (560 ° C.) is determined, this switching threshold is reduced to the current value in order to proceed according to case 3.
  • the relative Duty cycle saved for the last 5 values sinks this in two consecutive periods by at least 2%, is a empty dishes are recognized and e.g. the cooking zone switched off.
  • the duty cycle decreases from an equilibrium value of 65% when cooking with food when boiling empty within 6 min. on 35%, so that a drop of 2% is recognized very early and reliably.
  • the control elements 5 are actuated to change the power setting, is the empty cook detection for 2 min. overridden so that there are none False shutdowns come.
  • the formation of the derivatives according to case 1 takes place in the evaluation and control unit 8.
  • the electronic protective temperature limiter is a separate stage 7 shown. It can also be part of the evaluation and control unit 8, with Specification of the switch-off temperature by the software.

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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)
  • Cookers (AREA)
  • Control Of Temperature (AREA)
  • Resistance Heating (AREA)
EP99125600A 1999-02-13 1999-12-22 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 Expired - Lifetime EP1028602B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19906115 1999-02-13
DE19906115A DE19906115C1 (de) 1999-02-13 1999-02-13 Verfahren zum Erkennen des Leerkochens von Geschirr bei Kochfeldern mit einer Glaskeramik-Kochfläche und zugehörige Vorrichtung

Publications (3)

Publication Number Publication Date
EP1028602A2 true EP1028602A2 (fr) 2000-08-16
EP1028602A3 EP1028602A3 (fr) 2002-01-02
EP1028602B1 EP1028602B1 (fr) 2005-03-30

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EP99125600A Expired - Lifetime EP1028602B1 (fr) 1999-02-13 1999-12-22 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

Country Status (5)

Country Link
US (1) US6300606B1 (fr)
EP (1) EP1028602B1 (fr)
JP (1) JP2000240949A (fr)
DE (2) DE19906115C1 (fr)
ES (1) ES2238809T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008014268A1 (de) 2008-03-04 2009-09-17 E.G.O. Elektro-Gerätebau GmbH Verfahren und Vorrichtung zur Steuerung eines Kochfeldes

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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
US6818867B2 (en) * 2001-06-09 2004-11-16 Braun Gmbh Method for heating liquid in an electric kettle
DE10253198B4 (de) * 2002-11-15 2007-07-05 Electrolux Home Products Corporation N.V. Verfahren und Vorrichtung zur thermischen Überwachung eines induktiv erwärmbaren Gargefäßes
GB0313831D0 (en) * 2003-06-16 2003-07-23 Ceramaspeed Ltd Apparatus and method for detecting abnormal temperature rise associated with a cooking arrangement
DE10327273B4 (de) * 2003-06-17 2013-12-24 BSH Bosch und Siemens Hausgeräte GmbH Herd mit einem Kochfeld und mit einem Modul zur Steuerung des Kochfeldes
DE10329840A1 (de) * 2003-06-27 2005-01-20 E.G.O. Elektro-Gerätebau GmbH Verfahren und Vorrichtung zur Erkennung von Erwärmungsvorgängen
US8423193B2 (en) * 2003-08-20 2013-04-16 Watlow Electric Manufacturing Company Variable wattage control system
GB0426467D0 (en) * 2004-12-02 2005-01-05 Ceramaspeed Ltd Apparatus for detecting abnormal temperature rise associated with a cooking arrangement
AT8257U1 (de) * 2005-04-19 2006-04-15 Electrovac Messfühleranordnung
DE102005045875A1 (de) * 2005-09-22 2007-03-29 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Erzeugen, Verarbeiten und Auswerten eines mit der Temperatur korrelierten Signals und entsprechende Vorrichtung
GB2431784B (en) * 2005-11-18 2007-12-05 Crastal Technology Anti-dry burning control methods and apparatus
KR100672610B1 (ko) 2006-01-25 2007-01-22 엘지전자 주식회사 조리기기의 고열 상태 모니터장치 및 그 방법
DE102006057885A1 (de) * 2006-12-01 2008-06-05 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Erzeugen, Verarbeiten und Auswerten eines mit der Temperatur korrelierten Signals und entsprechende Vorrichtung
EP2327939A4 (fr) * 2008-09-09 2014-11-19 Kevin Lin Dispositif de commande de chauffage et procédé associé
US8259308B2 (en) * 2009-05-29 2012-09-04 Baking Acquisition Llc Sensor system and method for detecting misaligned trays and/or mis-positioned utensils in a direct recirculating oven
EP2339893B1 (fr) 2009-12-28 2016-05-18 BSH Hausgeräte GmbH Dispositif d'appareil de cuisson
DE102010019113A1 (de) * 2010-04-30 2011-11-03 Wilo Se Verfahren zur näherungsweisen Berechnung der operativen Temperatur eines Raumes
KR101492068B1 (ko) * 2010-08-05 2015-02-10 삼성전자 주식회사 유도가열조리기 및 그 제어방법
ES2473316B1 (es) * 2012-01-04 2015-09-29 Bsh Electrodomésticos España, S.A. Dispositivo de aparato de cocción
JP6278402B2 (ja) * 2014-09-29 2018-02-14 テルモ株式会社 電子体温計
JP6385777B2 (ja) * 2014-09-29 2018-09-05 テルモ株式会社 電子体温計
DE102015006825A1 (de) * 2014-12-15 2016-06-16 Küppersbusch Großküchentechnik GmbH & Co. KG Verfahren zur Steuerung einer Heizeinrichtung eines Gargerätes und Gargerät
US10813172B2 (en) * 2018-05-23 2020-10-20 Haier Us Appliance Solutions, Inc. Cooktop appliances and control methods for the same
WO2022234074A1 (fr) 2021-05-07 2022-11-10 Trinamix Gmbh Dispositif et procédé de surveillance d'une température d'émission d'un élément d'émission de rayonnement
KR20240004475A (ko) 2021-05-07 2024-01-11 트리나미엑스 게엠베하 복사 방출 요소의 방출 온도를 모니터링하는 디바이스 및 방법
CN113791102B (zh) * 2021-09-02 2022-07-26 东北石油大学 基于核磁共振双t2截止值确定岩心束缚流体分布的方法

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US4493981A (en) * 1984-03-05 1985-01-15 General Electric Company Boil dry protection system for cooking appliance
EP0652688A1 (fr) * 1993-10-28 1995-05-10 Daimler-Benz Aktiengesellschaft Méthode pour commander la puissance de chauffage d'une plaque viro-céramique selon les conditions de cuisson requises
EP0786923A2 (fr) * 1996-01-26 1997-07-30 AEG Hausgeräte GmbH Système de commutation pour une protection contre le suréchauffement d'une plaque vitro-céramique d'une aire de cuisson
EP0806887A1 (fr) * 1996-05-11 1997-11-12 AEG Hausgeräte GmbH Procédé et dispositif pour reconnaître le stade de cuisson d'aliments à cuire

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DE4022846C2 (de) * 1990-07-18 1994-08-11 Schott Glaswerke Vorrichtung zur Leistungssteuerung und -begrenzung bei einer Heizfläche aus Glaskeramik oder einem vergleichbaren Material
DE19632057C2 (de) 1996-08-09 2000-06-21 Schott Glas Verfahren zum Kalibrieren von Temperaturmeßwiderständen auf Trägern aus Glas, Glaskeramik oder dergleichen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493981A (en) * 1984-03-05 1985-01-15 General Electric Company Boil dry protection system for cooking appliance
EP0652688A1 (fr) * 1993-10-28 1995-05-10 Daimler-Benz Aktiengesellschaft Méthode pour commander la puissance de chauffage d'une plaque viro-céramique selon les conditions de cuisson requises
EP0786923A2 (fr) * 1996-01-26 1997-07-30 AEG Hausgeräte GmbH Système de commutation pour une protection contre le suréchauffement d'une plaque vitro-céramique d'une aire de cuisson
EP0806887A1 (fr) * 1996-05-11 1997-11-12 AEG Hausgeräte GmbH Procédé et dispositif pour reconnaître le stade de cuisson d'aliments à cuire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008014268A1 (de) 2008-03-04 2009-09-17 E.G.O. Elektro-Gerätebau GmbH Verfahren und Vorrichtung zur Steuerung eines Kochfeldes
WO2009112150A2 (fr) * 2008-03-04 2009-09-17 E.G.O. Elektro-Gerätebau GmbH Procédé et dispositif de commande d'une plaque de cuisson
WO2009112150A3 (fr) * 2008-03-04 2009-11-12 E.G.O. Elektro-Gerätebau GmbH Procédé et dispositif de commande d'une plaque de cuisson

Also Published As

Publication number Publication date
EP1028602A3 (fr) 2002-01-02
JP2000240949A (ja) 2000-09-08
DE19906115C1 (de) 2000-08-31
EP1028602B1 (fr) 2005-03-30
ES2238809T3 (es) 2005-09-01
DE59911842D1 (de) 2005-05-04
US6300606B1 (en) 2001-10-09

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