EP1028602B1 - Verfahren zum Erkennen des Leerkochens von Geschirr bei Kochfeldern mit einer Glaskeramik-Kochfläche und zugehörige Vorrichtung - Google Patents

Verfahren zum Erkennen des Leerkochens von Geschirr bei Kochfeldern mit einer Glaskeramik-Kochfläche und zugehörige Vorrichtung Download PDF

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Publication number
EP1028602B1
EP1028602B1 EP99125600A EP99125600A EP1028602B1 EP 1028602 B1 EP1028602 B1 EP 1028602B1 EP 99125600 A EP99125600 A EP 99125600A EP 99125600 A EP99125600 A EP 99125600A EP 1028602 B1 EP1028602 B1 EP 1028602B1
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EP
European Patent Office
Prior art keywords
temperature
signal
control
regulating
switch
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Expired - Lifetime
Application number
EP99125600A
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German (de)
English (en)
French (fr)
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EP1028602A2 (de
EP1028602A3 (de
Inventor
Harry Engelmann
Kurt Dr. Schaupert
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Schott AG
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Schott AG
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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 cooking surface that at least a cooking zone, which is associated with a radiator whose Energy supply is set via control and regulating bodies, and in which the temperature or a derived quantity as a signal (Temperature signal) operational detected and by means of a Protection temperature limiter limited with adjustable shutdown temperature is, by comparing the actual Temperatursignals with the shutdown temperature and forming a control signal for detecting the emptying of the dishes.
  • the invention further relates to a device for carrying out this Process.
  • DE 43 36 752 A1 discloses a method for detecting empty cooking of crockery on hobs with a ceramic hob and a associated device has become known that both the measurement of Temperature as well as the determination of their first derivative. Only when the value of the first derivative exceeds a threshold, the initial one Heating power reduced by 100%. Furthermore, this document is to infer that empty cooking metal pots due to their sinking electrical Heating capacity can be detected at the same temperature and when sinking under a certain power value, the power supply is interrupted. These Method has the in connection with the aforementioned US-Scripture described disadvantages.
  • the invention is based on the object, the method initially described so to lead or the associated device in such a way that a secure Detection of the critical operating condition of emptying the dishes regardless of the current power setting and also independent of Cookware type and thus a safe protection of the associated cooking zone This critical operating condition is possible.
  • the individual temperature constellations are coupled with each other, as the Temperature of the cooking zone is not a constant size, especially since the rule and Control bodies can be operated at any time.
  • the link is the Detection of the critical operating state according to an embodiment of Invention made such that upon actuation of the control and control organs in For purposes of reducing the power supply, forming the control signal for a predetermined period of time, preferably in the range of two minutes, disabled is checked, and then checked whether the temperature is still at the Shutdown temperature is or has fallen so far that switched to the case is that both time derivatives are positive, i. it is then one Temperature constellation with the corresponding signal formation conditions according to the first temperature constellation.
  • the regulatory and control bodies actuated, then according to an embodiment of the invention the Shutdown temperature raised back to the original value, so if necessary the full power at high temperature is ready.
  • the method is performed so that the predetermined time interval for the deactivation of the formation of a control signal after actuation of the control and regulation devices in the range of two minutes lies.
  • the method performed so that the time derivative of the temperature signal a regression line through the earlier temperature values and the difference whose extrapolation to the current temperature value is formed, and that the second time derivative of the temperature signal from a balancing line by the earlier values of the first time derivative and the difference of their extrapolation is formed at the current value of the first time derivative becomes.
  • the evaluation of the detection of the critical operating state can on done in different ways. This condition can be displayed in the simplest case be advantageous, but associated with a warning, the acoustic, or optically but also by remote action (Homebus) can be done. At a fully automated control is preferably directly the radiator switched off.
  • the inventive method for detecting the empty cooking of the dishes is based on .the evaluation of the change in the heat flow and the so connected variables temperature and duty cycle of the cooking appliance and the from these two derived quantities.
  • the second derivative next to the first derivative also positive, i. it lies the same value constellation as in the empty cooking according to FIG. 2 before.
  • the user is obviously present, which is why in this case the Detection of the critical operating condition will be temporarily overridden without compromising protection.
  • the recognition is reactivated.
  • the second derivative after some time positive, as in the diagram of FIG. 3 is shown.
  • the first derivative is negative in this case, causing this case can be distinguished as uncritical.
  • the power control of cooking zones is typically done according to the state the technology by clocking the power supply. It is at a fixed total duration the interval of e.g. 40 s the ratio of switched on, i. current-carrying duration, to the total duration, varies. This switching on and off leads to a periodic change in the glass-ceramic temperature, which is the overlaid with long-term temperature change. To the disturbing influence of this filter out periodic change is, according to one embodiment of the Invention the temperature synchronous to the clocking - e.g. always at the Cut-off edge - measured.
  • the accuracy of the temperature measurement requires consideration. in the In fact, the temperature measurements are subject to fluctuations in practical operation by measurement inaccuracies and disturbances. Usually, the Reducing these effects averaged several values over time. this means However, a delay in the detection of the empty cooking dishes, since only several values must be available for averaging. Especially when clocking the Energy controller with the typical rate of one clock per 40 s is this Delay for detecting the critical operating condition intolerable.
  • the procedure can be also 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, successfully perform. It is advantageous here that the aging of the sensors Procedure not obstructed, since only the time derivatives of Resistance values are used. A temperature calibration of the sensors not necessary.
  • the operating state of the empty cooking of the dishes is therefore in the first Temperature range detected as critical if both the first and second time derivative of the temperature are positive without the control and Regulatory bodies within a given time to increase the Power supply were confirmed. However, this constellation is below described 2nd temperature range is no longer given.
  • the temperature of the glass ceramic cooking surface is at the shutdown temperature of the Protective temperature limiter, the temperature does not change when emptying. At this temperature constellation, the protection temperature limiter controls constant temperature. The after emptying worse heat dissipation of Systems then express themselves in a reduced current duty cycle per cycle. As an indication of the critical operating condition is then used that the Current duty decreases, although the control and regulating organs are not were pressed.
  • the shutdown temperature of the protection temperature limiter will increase lowered the current value and an empty cooking utensils then as at the case constellation described in 2. recognized.
  • This method first sets the detection of a temperature equilibrium state ahead. This condition is recognized when the Temperature changes over a longer period only insignificantly. Is the temperature then only slightly below the usual shutdown temperature of Protective temperature limiter, its shutdown temperature is on the current Temperature value reduced.
  • Fig. 5 is an embodiment of a device for detecting the Empty cooking utensils in a hob with a glass ceramic cooking surface 1, which has four cooking zones 2 in the embodiment.
  • Everyone Cooking zone 2 is assigned a radiator 3, for example an electric operated radiant heater whose energy supply via a control stage 4, operable via control elements 5, for example, touch switch, rotary switch or the like, is adjustable.
  • Each cooking zone 2 is also a temperature sensor 6, directly the temperature in the cooking zone or one of them Derived size is recorded operationally.
  • Such temperature sensor for cooking zones are in various embodiments in the market or in the relevant Writing, e.g. in DE 196 32 057 A1, described. The better overview 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 once fed to the control stage 4, as an actual value for the usual temperature control of the cooking zone.
  • a protective temperature limiter 7 with adjustable switch-off temperature T A here in electronic design, which is also connected to the 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 switching threshold.
  • Such protective temperature limiter with adjustable shutdown temperature are also known.
  • the evaluation and control unit 8 acts with its output A1 on the protection temperature limiter 7 with respect to the specification of the cut-off temperature T A and it is connected via output A2 also with the control stage 4, in order to switch off at a critical operating condition can. Via the output A3, it is connected to a display and / or warning unit 9 in which the critical operating state is displayed or an optical or acoustic alarm signal is generated.
  • Steps to detect the emptying of dishes on the cooking zones 2 is erected.
  • the linking of the steps and the created Signals is again in the Fig. 6 in the form of a conventional flow chart for the presented individual program steps, from which also the relationships directly result for the three described temperature constellations. Due to the detailed description of the process steps in the individual Temperature constellations and their inner connection needs at this Do not further describe the flowchart of FIG. 6 in more detail become. The following remarks should suffice:
  • the temperature information T A is stored in the evaluation and control unit 8 to calculate the best-fit line through the last 5 measurement points and the extrapolation to the current time point corresponding to FIG. 4. If an approximately constant temperature in the range is determined within 40K of the switching threshold of the protection temperature limiter 7 (560 ° C), this switching threshold is lowered to the current value to continue according to case 3.
  • the electronic protection temperature limiter is as 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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)
  • Control Of Resistance Heating (AREA)
  • Control Of Temperature (AREA)
  • Resistance Heating (AREA)
EP99125600A 1999-02-13 1999-12-22 Verfahren zum Erkennen des Leerkochens von Geschirr bei Kochfeldern mit einer Glaskeramik-Kochfläche und zugehörige Vorrichtung Expired - Lifetime EP1028602B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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
DE19906115 1999-02-13

Publications (3)

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

Family

ID=7897449

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EP99125600A Expired - Lifetime EP1028602B1 (de) 1999-02-13 1999-12-22 Verfahren zum Erkennen des Leerkochens von Geschirr bei Kochfeldern mit einer Glaskeramik-Kochfläche und zugehörige Vorrichtung

Country Status (5)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7928344B2 (en) 2006-01-25 2011-04-19 Lg Electronics Inc. Apparatus and method for monitoring hot surface of cook top

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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
DE10262141B4 (de) * 2002-11-15 2009-10-15 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
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
DE102008014268A1 (de) 2008-03-04 2009-09-17 E.G.O. Elektro-Gerätebau GmbH Verfahren und Vorrichtung zur Steuerung eines Kochfeldes
EP2327939A4 (en) * 2008-09-09 2014-11-19 Kevin Lin HEATING CONTROL DEVICE AND METHOD THEREFOR
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 (de) 2009-12-28 2016-05-18 BSH Hausgeräte GmbH Gargerätevorrichtung
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
WO2022234073A1 (en) 2021-05-07 2022-11-10 Trinamix Gmbh Device and method for monitoring an emission temperature of a radiation emitting element
WO2022234074A1 (en) 2021-05-07 2022-11-10 Trinamix Gmbh Device and method for monitoring an emission temperature of a radiation emitting element
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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Publication number Priority date Publication date Assignee Title
US7928344B2 (en) 2006-01-25 2011-04-19 Lg Electronics Inc. Apparatus and method for monitoring hot surface of cook top

Also Published As

Publication number Publication date
DE59911842D1 (de) 2005-05-04
EP1028602A2 (de) 2000-08-16
DE19906115C1 (de) 2000-08-31
ES2238809T3 (es) 2005-09-01
JP2000240949A (ja) 2000-09-08
US6300606B1 (en) 2001-10-09
EP1028602A3 (de) 2002-01-02

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