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WO2009112150A2 - Procédé et dispositif de commande d'une plaque de cuisson - Google Patents

Procédé et dispositif de commande d'une plaque de cuisson Download PDF

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Publication number
WO2009112150A2
WO2009112150A2 PCT/EP2009/001314 EP2009001314W WO2009112150A2 WO 2009112150 A2 WO2009112150 A2 WO 2009112150A2 EP 2009001314 W EP2009001314 W EP 2009001314W WO 2009112150 A2 WO2009112150 A2 WO 2009112150A2
Authority
WO
WIPO (PCT)
Prior art keywords
hob
cooking
temperature
empty
time
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.)
Ceased
Application number
PCT/EP2009/001314
Other languages
German (de)
English (en)
Other versions
WO2009112150A3 (fr
Inventor
Wolfgang Thimm
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 WO2009112150A2 publication Critical patent/WO2009112150A2/fr
Publication of WO2009112150A3 publication Critical patent/WO2009112150A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0266—Cooktops
    • 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 controlling a hob, wherein the hob has a empty cooking detection as empty cooking protection at a cooking point of the hob, and a trained for performing the method device.
  • the invention has for its object to provide an aforementioned method and an aforementioned device for its implementation, with which problems of the prior art can be avoided and in particular a both reliable and practical embryo protection is achieved.
  • the temperature at the cooking point is detected in a manner known per se.
  • exceeding a certain temperature rise threshold within a short time for example 4O 0 C more within a one minute rise time, at the cooking surface results in a reduction in power or even a power cut.
  • a present in a cooktop control timer is restarted and counts from this time the elapsed time.
  • the limit value for the temperature rise is changed so that, with increasing elapsed time, the limit value for the temperature rise leading to the triggering of the idle power detection with power cut becomes lower.
  • the limit value for the temperature rise is changed so that at the same time leading to the power reduction or power-off temperature difference is lower or a lesser increase in temperature sufficient for power reduction.
  • the hob control is an electronic control and not electromechanical.
  • any operation on the hob is interpreted as a sign and used that an operator is present and would notice a possibly critical or inadmissible or unwanted state on the hob or a cooking area.
  • a relatively high limit is required for the temperature rise, which leads to activation of the empty cooking protection. So this means that the temperature must be relatively high increase within a given short period of time, for example, the aforementioned 4O 0 C within a minute or half a minute to activate the no-boil protection. After all, the operator is with a certainty yes still near the hob.
  • the invention for better embryo protection, the recognition that usually with still running on the hob cooking operations, an operator is at least not too far away from the hob or over again makes a changed setting and thus their presence can be determined.
  • a touching of the pot by lifting the lid to check the contents of the pot could also be considered as an operating procedure, as is known for example from DE 10 2004 059 822 A1 or DE 10211047 A1, whose content is hereby incorporated by express reference is made to the content of the present description.
  • the limit for the temperature rise is set high again and is reduced again over time. The present operator would notice an empty cook, and thus this risk is lower.
  • a so-called unclear or critical state of the cooking area is defined by the fact that in this unclear or critical state, the temperature rise is close to the limit value, but has not yet exceeded.
  • an unclear state of the invention may be provided in a development that the timer continues to run and at the same time the hotplate is significantly reduced in their performance. If there is still a so-called normal cooking process, in which there is still water in a saucepan on the cooking surface of the hob, so this reduction in temperature, the temperature rise is significantly lower or the temperature remains the same or even drops.
  • this power reduction in unclear state serves to clarify the state in one direction or the other.
  • the power reduction in the event of an unclear state is greater.
  • the fact is taken into account that after a long counted time of the timer, the probability is correspondingly high that an operator is no longer present. Conversely, it can also be said that with only a little time in the past, there is a high probability that an operator will still be present.
  • the power reduction is changed such that with increasing time the power reduction is increased when the limit is exceeded.
  • the power reduction may be combined with or alternatively provided with the aforesaid reduction of the threshold value leading to the triggering of the cookie detection.
  • a single timer is provided on the hob, which is integrated in particular in the hob control. It is just restarted by any switching operation or operation on the hob, for example se also by the above-mentioned touching a saucepan.
  • the timer may also consider the absolute duration of a cooking process for the formation of the limit. Shortly after the start of a cooking process, the risk of emptying can still be great, for example, when a pot has been put on empty. Then the danger is initially lower again, and then rise again after a few minutes, when a previously filled pot could be cooked empty.
  • the temperature rise may be as a threshold value in dependence on an elapsed time after 3 minutes, about 4O 0 C, after 15 minutes about 2O 0 C and after 30 minutes about 1 O 0 C.
  • the limit value should but not or only slightly below 1O 0 C fall.
  • the said very short time within which this limit value for the temperature rise must be exceeded in order for the empty cooking protection to be activated to lie at one minute, possibly even present, may advantageously take place. under, for example, at 20 to 30 seconds. Instead of changing the limit for the temperature rise, this time can be extended, which has similar effects on the value for the temperature rise.
  • the hob has a empty cooker detection as empty cooking protection at a hob of the hob, the temperature is detected at the hob.
  • a timer is restarted in a cooktop control, and depending on the elapsed time detected by the timer after its respective start, the value for the glass-ceramic limit temperature of a cooktop panel of the cooktop of the cooktop is changed in such a way that the value for the glass-ceramic limit temperature is lowered as time goes on.
  • too high a temperature can be avoided on the glass ceramic and especially on the pot.
  • FIG. 1 is a schematic sectional view through a hob with a radiant heater, a temperature sensor and a controller including timer,
  • FIG. 3 shows the first derivative of the temperature profile from FIG. 2, FIG.
  • FIG. 4 shows a modification of the temperature profile from FIG. 2 with simple disturbances at intervals of approximately 10 minutes
  • FIG. 5 shows the first derivative of the temperature profile from FIG. 4, FIG.
  • FIG. 6 shows the second derivative of the temperature profile from FIG. 2, FIG.
  • FIG. 8 shows a course of the inverted derivative of the temperature profile from FIG. 2
  • FIG. 9 shows the inverted derivative of the temperature profile from FIG. 4.
  • a hob 11 is shown as Elektrokoch réelle. It has a hob plate 12, in particular of glass ceramic, below which a heater 14 is arranged in the form of a conventional radiant heater. On the hob plate 12, a pot 13 is placed above the heater 14 to heat its contents or bring to a boil. On the underside of the hob plate 12, a temperature sensor 15 is mounted in the region of the heater 14. Such temperature sensors are also known to the person skilled in the art Temperature ranges from a few 100 0 C up to 800 0 C. The temperature sensor 15 detects the temperature and passes it on to a controller 17, where it is electronically queried about this. This means that the temperature signal T is present in the controller 17 and can be further processed.
  • This further processing can be carried out, for example, in particular according to EP 1 768 461 A1 and also according to DE 10 2006 057885 A1, to which reference is expressly made with regard to this further processing and the content of which is hereby incorporated by express reference into the content of the present description.
  • a timer 18 is still arranged or provided.
  • the controller 17 is schematically connected to the heater 14 to reduce or shut down their power, which is usually done via corresponding circuit breakers.
  • the controller 17 is connected to or controls an LED 20, which is also arranged below the cooking plate 12. A lighting effect of the LED 20 is, as shown, through the hob plate 12 visible therethrough.
  • FIGS. 2 to 9 show temperature profiles, discharges and curves further processed in FIGS. 8 and 9, which have been determined on the basis of the temperature profiles.
  • empty cooking so if a content of the pot 13, for example, water is evaporated as quickly as possible to detect, so that the power of the heater 14 can be reduced or turned off, so that no harmful excess temperature at the Hob plate 12 and the pot 13 may occur.
  • malfunctions should be detected and hidden, so that the cooking process is interrupted or terminated only in an emergency. From the temperature profile according to FIG. 2, it can be seen that the temperature at the temperature sensor 15 rises sharply in the first minutes of the cooking process, and then always weaker, until it increases only slowly and gradually from about 20 minutes.
  • a sharp rise in temperature is again detectable, which means that at this time the pot 13 is cooked empty and therefore the temperature rises noticeably strong.
  • a so-called bar regulator is provided as over-temperature protection, above all for the hob plate 12, which is arranged at a short distance below it.
  • this rod regulator is only provided for controlling the temperature of the glass ceramic of the hob plate 12. The temperature of the cookware could thus still increase significantly, up to the limit temperature of the glass ceramic, which could destroy the cookware or even be dangerous for the user.
  • a further general embodiment of the method according to the invention is that the temperature of the sensor, which is adjusted to protect the glass ceramic from too high a temperature and a consequent damage, namely the so-called glass ceramic limit temperature, is reduced with increasing time.
  • Fig. 3 the first derivative of the temperature profile of Fig. 2 is shown.
  • the heater 14 could be reduced in power or switched off.
  • the temperature profile is very uniform and, above all, can be detected very well and evenly.
  • the temperature profile may exhibit fluctuations or small disturbances or glitches.
  • Reasons for such disturbances can be varied, for example clocking heaters at the same or an adjacent phase, mains voltage fluctuations, coupled Störindutationen, temperature susceptibility of components and much more.
  • FIG. 4 Such a temperature profile with glitches at intervals of 10 minutes is shown in Fig. 4.
  • the glitches are placed on a temperature profile corresponding to that of FIG. The problem arising from this is very clear when looking at the first derivative in FIG. 5 of the temperature profile according to FIG. 4.
  • the interference peaks also lead to a short-term sharp increase in the course according to FIG. 5 or the gradient.
  • these glitches which do not signify emptying yet, are not yet intended to reduce the heating power at the heating device 14.
  • FIG. 8 shows a further processing of the temperature profile of FIG. 2, similar to the aforementioned EP 1 768 461 A1, in which the method of FIG. 2 is differentiated once by time, which then results in the course of FIG. 3. This result is then inverted, but then no longer potentiated.
  • the simulation assumes a simple In t behavior. Similarly, the trajectory can be easily calculated, since the 1st derivative of the In t is a 1 / t law, the 2nd derivative is -1 / t 2, and the inverse of the 1st derivative is simply a linear increase with t.
  • the time which can be left until a decision as to whether or not there is empty cooking in order to classify the time which can be left until a decision as to whether or not there is empty cooking, depending on a situation that is likely to be present, it can be changed as the duration of a cooking process progresses.
  • Fig. 2 At the beginning of a cooking process, so in Fig. 2 even further left, one can leave a little more time to observe a temperature rise and just then to determine as borderline high within a certain time.
  • the likelihood that a pot 13 set on the heater 14 is empty is larger at the beginning of a cooking process.
  • This may be the limit value for a temperature increase within a time of one minute, which causes a shutdown as measured on the absolute temperature profile according to FIG. 2 or then also according to FIG. 4 with glitches.
  • Time is always the last operation or how much time has passed since the last operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Cookers (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Combustion (AREA)

Abstract

L'invention concerne un procédé de commande d'une plaque de cuisson (11), avec détection de récipient vide sur une plaque de cuisson, en tant que protection antisurchauffe, procédé consistant à détecter la température au point de cuisson (14). Dans la détection de récipient vide, lorsqu'une valeur limite déterminée de montée en température est dépassée, une mise hors circuit intervient en un temps réduit au point de cuisson (14). Après chaque mise en circuit ou commande de la plaque de cuisson (11), un chronomètre (18) prévu dans la commande de la plaque de cuisson (17) est réenclenché et, en fonction du temps écoulé qui est détecté par le chronomètre (18) après sa mise en marche, la valeur limite de montée en température est modifiée de telle façon, que lorsque la durée écoulée s'accroît, la valeur limite de montée en température provoquant le déclenchement de la détection de récipient vide avec mise hors circuit, est plus faible.
PCT/EP2009/001314 2008-03-04 2009-02-25 Procédé et dispositif de commande d'une plaque de cuisson Ceased WO2009112150A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008014268A DE102008014268A1 (de) 2008-03-04 2008-03-04 Verfahren und Vorrichtung zur Steuerung eines Kochfeldes
DE102008014268.9 2008-03-04

Publications (2)

Publication Number Publication Date
WO2009112150A2 true WO2009112150A2 (fr) 2009-09-17
WO2009112150A3 WO2009112150A3 (fr) 2009-11-12

Family

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Application Number Title Priority Date Filing Date
PCT/EP2009/001314 Ceased WO2009112150A2 (fr) 2008-03-04 2009-02-25 Procédé et dispositif de commande d'une plaque de cuisson

Country Status (2)

Country Link
DE (1) DE102008014268A1 (fr)
WO (1) WO2009112150A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102934517A (zh) * 2010-06-10 2013-02-13 松下电器产业株式会社 感应加热烹调器
ES2473316R1 (es) * 2012-01-04 2014-12-10 Bsh Electrodomésticos España, S.A. Dispositivo de aparato de cocción
US20230389135A1 (en) * 2022-05-25 2023-11-30 Haier Us Appliance Solutions, Inc. Cooktop appliance and method for detecting cookware removal
EP4580314A1 (fr) * 2023-12-28 2025-07-02 Arçelik Anonim Sirketi Cuiseur à chauffage par induction

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2339893B1 (fr) * 2009-12-28 2016-05-18 BSH Hausgeräte GmbH Dispositif d'appareil de cuisson
EP2910858B1 (fr) * 2014-02-20 2019-11-06 Electrolux Appliances Aktiebolag Procédé, produit de programme informatique et système pour protéger un processus automatisé pour faire fonctionner un appareil ménager basé sur une mesure de capteur pour fournir un paramètre de traitement attendu
DE102017220814A1 (de) * 2017-11-22 2019-05-23 E.G.O. Elektro-Gerätebau GmbH Verfahren zur Steuerung eines Kochgeräts mit einem externen Steuergerät, Kochgerät und System
DE102020201610B3 (de) * 2020-02-10 2021-05-12 E.G.O. Elektro-Gerätebau GmbH Verfahren zur Ansteuerung einer Heizeinrichtung eines Kochfelds und Kochfeld
US11570853B2 (en) 2021-02-01 2023-01-31 E.G.O. Elektro-Geraetebau Gmbh Method for actuating a heating device of a hob, and hob
DE102021213416A1 (de) 2021-11-29 2023-06-01 BSH Hausgeräte GmbH Verfahren zum Betreiben eines Gargeräts, sowie Gargerät

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US4493981A (en) * 1984-03-05 1985-01-15 General Electric Company Boil dry protection system for cooking appliance
FR2652172B1 (fr) * 1989-09-15 1996-06-28 Europ Equip Menager Dispositif et procede de regulation d'appareil de cuisson.
GB2325533B (en) * 1997-05-22 2001-08-08 Ceramaspeed Ltd Method and apparatus for controlling an electric heater
DE19851029C2 (de) * 1998-11-05 2000-12-21 Schott Glas Verfahren zum Anpassen des Grenzwertes der Betriebstemperatur einer Glas-/Glaskeramikkochfläche und Vorrichtung zur Durchführung des Verfahrens
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
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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DE10303467A1 (de) * 2003-01-29 2004-08-05 BSH Bosch und Siemens Hausgeräte GmbH Elektrogerät
DE10305789A1 (de) * 2003-02-06 2004-09-09 E.G.O. Elektro-Gerätebau GmbH Verfahren und Vorrichtung zur Steuerung einer Heizeinrichtung
DE102004059822B4 (de) 2004-12-03 2011-02-24 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Betrieb eines Induktionskochfelds
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
DE102006038832A1 (de) * 2006-03-23 2007-09-27 Electrovac Ag Verfahren sowie Schaltungsanordnung zum Steuern wenigstens eines Heizelementes eines Heizgerätes
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102934517A (zh) * 2010-06-10 2013-02-13 松下电器产业株式会社 感应加热烹调器
CN102934517B (zh) * 2010-06-10 2015-05-13 松下电器产业株式会社 感应加热烹调器
ES2473316R1 (es) * 2012-01-04 2014-12-10 Bsh Electrodomésticos España, S.A. Dispositivo de aparato de cocción
US20230389135A1 (en) * 2022-05-25 2023-11-30 Haier Us Appliance Solutions, Inc. Cooktop appliance and method for detecting cookware removal
EP4580314A1 (fr) * 2023-12-28 2025-07-02 Arçelik Anonim Sirketi Cuiseur à chauffage par induction

Also Published As

Publication number Publication date
WO2009112150A3 (fr) 2009-11-12
DE102008014268A1 (de) 2009-09-17

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