EP1615469A2 - Appareil de cuisson muni d'une détection de temperature et son procédé de détection associé à un appareil de cuisson. - Google Patents

Appareil de cuisson muni d'une détection de temperature et son procédé de détection associé à un appareil de cuisson. Download PDF

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Publication number
EP1615469A2
EP1615469A2 EP05014417A EP05014417A EP1615469A2 EP 1615469 A2 EP1615469 A2 EP 1615469A2 EP 05014417 A EP05014417 A EP 05014417A EP 05014417 A EP05014417 A EP 05014417A EP 1615469 A2 EP1615469 A2 EP 1615469A2
Authority
EP
European Patent Office
Prior art keywords
cookware
plate
temperature
quotient
quotient pyrometer
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.)
Withdrawn
Application number
EP05014417A
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German (de)
English (en)
Other versions
EP1615469A3 (fr
Inventor
Christian Seidler
Michael Dr. Riffel
Lutz Dr. Ose
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 EP1615469A2 publication Critical patent/EP1615469A2/fr
Publication of EP1615469A3 publication Critical patent/EP1615469A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a cooking appliance with a device for detecting the temperature of the cookware on its outside and a method for detecting the temperature.
  • IR sensor is arranged upwardly extendable at the rear edge of a hob and measures over an air gap across the heat radiation, which emanates from the cookware. From this, the temperature is calculated.
  • the cooking appliance which is preferably a hob, a carrier and a heater for the cookware.
  • the cookware can be placed on the carrier.
  • a temperature detection device is provided, which detects or interrogates the temperature at a location on the outside of the cookware.
  • This device has at least one quotient pyrometer, which is directed to the cookware or a specific location.
  • the device has a control with which the temperature of the cookware can be determined using the signals or information that the Quotient pyrometer delivers.
  • the controller is connected to or has a memory. In this data are stored, which are used to process the signals or to determine the temperature. In particular, these are physical data or stored measurement curves, which will be discussed in more detail below.
  • the advantage of using a quotient pyrometer is that the intensity of the thermal radiation is measured in two temperature ranges which are of interest or to be expected for the measurement in two wavelength ranges which are very close to one another, and the quotient is determined therefrom. It is assumed that the course of the radiation intensity in this wavelength range can be approximated by a straight line according to Planck's law of radiation. By forming the quotient, the slope of this line can be determined.
  • the curves of Planck radiation intensity versus wavelength are known and have a characteristic characteristic of the temperature. So they are different, each with its own, specific slope at each wavelength. The curves are stored for example in the memory. Thus, from the slope of this line the curve in question and thus the temperature can be determined.
  • the size of the emissivity of the surface of the cookware as well as a possible attenuation by other conditions in the measuring path is negligible. Such an error would be the same in both measurements and cancel out insofar as the absolute values of the radiation intensity are lower than actually come out.
  • the straight line is lower than the actual radiation intensity of the cookware. However, from the slope it corresponds to this. Of course, care should be taken that a wavelength range is used in which the distinctness The different temperature curves based on their slope is well possible.
  • the carrier for the cookware is a plate of at least partially radiation-permeable material.
  • glassy materials in particular toughened glass or glass ceramic.
  • Especially for cooktops glass ceramic has prevailed, but can also be used as a carrier or wall in an oven.
  • the temperature measurement in a corresponding manner by glass ceramic or a similar material is also possible with an oven.
  • the cookware On the aforementioned plate is the cookware, wherein advantageously the heating device is arranged underneath. Especially with a hob, it may be a so-called radiant heating or induction heating. Particularly advantageous in an aforementioned embodiment, the quotient pyrometer is arranged below the plate and directed to the cookware or the aforementioned location at which the temperature is to be detected. Usually this is the bottom of the cookware. Depending on the type of cookware may be provided to select either a central area or a circumferential area at which the temperature detection is to take place.
  • the quotient pyrometer may be disposed between the plate and the heater, and should have thermal insulation if it is in the heating area of the heater. It may also be located adjacent to the heater and directed obliquely to a location above it. Likewise, it may be directed through a passage in the heater.
  • the quotient pyrometer In order to reduce or even exclude influences of the plate or the glass ceramic on the measured radiation intensity as possible, it is advantageous to set the quotient pyrometer to a wavelength range in which the transmittance of the plate is very large and tends towards one. It is of course advisable to turn it off on the expected or to be measured temperature range, in a cooktop in about 80 ° C to 300 ° C. For glass ceramics, for example, a wavelength range of about 2.5 ⁇ m lends itself to this, since a maximum transmission is usually possible here.
  • a second quotient pyrometer may be provided which detects the temperature of the plate on which the cookware is standing. This is done with the aim of eliminating the heat radiation generated by the heating of the plate itself so that it can not distort the intensity measurement with the first quotient pyrometer.
  • the second quotient pyrometer is set to a wavelength range in which the transmittance of the plate is relatively low or even tends to zero.
  • a wavelength range below 0.5 ⁇ m lends itself here. The sequence of the corresponding method will be explained below.
  • data may be stored in the memory, in particular, so to speak curves of the radiation intensity over the wavelength for different temperatures. At least, this should be for the wavelength range to which the first quotient pyrometer is set. For the use of the second quotient pyrometer, these data are also advantageously available for its wavelength range.
  • the first quotient pyrometer in the wavelength range of about 2.5 microns, which is particularly advantageous in a measurement through glass ceramic throughout.
  • a measuring method can proceed in such a way that a total radiation intensity of the cookware and the plate is detected together with the first quotient pyrometer.
  • the second quotient pyrometer With the second quotient pyrometer, the radiation intensity of only the plate is detected.
  • the wavelength ranges are chosen so that the transmission of the plate on the one hand as high as possible and on the other hand is almost zero.
  • Stored data are used to calculate the temperature of the plate and, either via this step or directly from the measured radiation intensity of the plate, to calculate the radiation intensity of the plate at the wavelength at which the first quotient pyrometer measures.
  • the proportion is determined in the wavelength range of the first quotient pyrometer, which is due to the radiation of the plate. This proportion is deducted from the total measured radiation intensity, which has been determined by the first quotient pyrometer. From the obtained value, the temperature can be determined, which then rests on the outside of the cookware.
  • both the advantage of the measurement with a quotient pyrometer can be used as well as by the implementation of the two measurements with two quotient pyrometers a disturbing or distorting influence of the glass ceramic, through which is measured, can be reduced.
  • a hob 11 in which a cookware 15 is placed on a glass ceramic plate 13.
  • the cookware 15 is a so-called saucepan and contains a food 16, such as soup or potatoes to be cooked.
  • a heater 18 is arranged below the glass ceramic plate 13, as in a conventional hob with radiant heating. This is designed according to a conventional radiant heater. The generated heat radiation is directed upward in the direction of the cookware 15 and penetrates the glass ceramic plate 13 with a substantial proportion. This reaches the bottom of the cookware 15 and heats it up.
  • Two quotient pyrometers 20a and 20b are arranged in a region on the underside of the glass ceramic plate 13 with shield 21.
  • the shield 21 protects the quotient pyrometers 20a and 20b against unwanted extraneous radiation from the side and from the heater 18. So may also possibly harmful overheating of the ratio pyrometer 20a and 20b are avoided because the temperature just above the heater 18 can be up to 700 or 800 ° C.
  • the quotient pyrometers 20 "are shown, which are arranged below the heating device 18. Their direction of action is through the heating device 18 or a corresponding passage, in which case a small opening may already be sufficient.
  • the left quotient pyrometer 20a is set to a wavelength at which the transmission of the glass-ceramic plate 13 is as large as possible. According to the diagram of FIG. 2, this applies to a wavelength of about 2.5 ⁇ m. Radiation with this wavelength is more than 80% through the glass ceramic plate 13 therethrough. This is indicated by the symbolic heat radiation in FIG. 1, which, starting from the underside of the cookware 14, passes through the glass-ceramic plate 13 to the left-handed quotient pyrometer 20a.
  • the right-hand quotient pyrometer 20b is set to a wavelength at which the transmission of the glass-ceramic plate is as low as or equal to zero. This is the case, for example, at a wavelength of 0.5 ⁇ m, to which the quotient pyrometer 20b is set.
  • a wavelength at which the transmission of the glass-ceramic plate is as low as or equal to zero This is the case, for example, at a wavelength of 0.5 ⁇ m, to which the quotient pyrometer 20b is set.
  • the two quotient pyrometers 20a and 20b are connected to a controller 24.
  • the controller 24 in turn is connected to a memory 26 and a switch 28, with which the power supply to the heater 18 can be controlled. Furthermore, it should be noted, above all, that the controller 24 makes it possible to evaluate the data of the quotient pyrometers 20a and 20b. Therefore, it can generally be regarded as an evaluation.
  • the temperature can be determined from this. This will, as explained below, used for temperature determination.
  • the left quotient pyrometer 20a is set to the wavelength range of 2.5 ⁇ m and measures the total radiation intensity at two wavelengths around 2.5 ⁇ m, which are for example only about 10 to 100 nm apart.
  • the quotient formation which can be made by the quotient pyrometer 20a itself or the controller 24, two slightly spaced values for the intensity E for two closely spaced wavelengths can be determined. These define a straight line which corresponds to one of the dash-dotted lines and thus tangents according to FIG. 2. Thus, approximately the temperature can be determined.
  • both the hot bottom of the cookware 115 radiates downwards and the heated glass ceramic plate 13 itself. Desired is only the intensity of the cookware.
  • the proportion of the glass-ceramic plate 13 can be eliminated from empirical values for specific temperatures via correction data stored in the memory 26.
  • the second quotient pyrometer 20b is used, as described below.
  • the second quotient pyrometer 20b is set at a wavelength of about 0.5 ⁇ m.
  • the intensity and thus temperature of only the glass-ceramic plate 13 in a spatial region near the first quotient pyrometer 20a is measured. If the temperature of the glass-ceramic plate 13 is known therefrom, it can again be determined according to the diagram from FIG. 2 which radiation intensity the glass-ceramic plate 13 has at the wavelength of 2.5 ⁇ m. This radiation intensity of the glass-ceramic plate 13 can be subtracted from the total radiation intensity measured by the quotient pyrometer 20a, so that the radiation intensity, which goes back exclusively to the cookware 15, can be determined. Based on this, in turn, the temperature of the cookware 15 can be determined by using the curves of FIG. 2.
  • the controller 24 can directly via the switch 28 to supply energy to Heating device 18 and thus control the heating of the cooking product 16.
  • the control or evaluation 24 may be connected to an overall control for the cooking money 11 or even be integrated therein and thus influence the energy supply to the heating device 18.
  • a quotient pyrometer 20 mounted under the glass ceramic plate 13 is that it is protected against contamination or damage. Furthermore, it is rigid and immovable, which is very simple in construction.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
EP05014417A 2004-07-07 2005-07-02 Appareil de cuisson muni d'une détection de temperature et son procédé de détection associé à un appareil de cuisson. Withdrawn EP1615469A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410033454 DE102004033454A1 (de) 2004-07-07 2004-07-07 Kochgerät mit Temperaturerfassung und Verfahren zur Temperaturerfassung an einem Kochgerät

Publications (2)

Publication Number Publication Date
EP1615469A2 true EP1615469A2 (fr) 2006-01-11
EP1615469A3 EP1615469A3 (fr) 2007-09-05

Family

ID=34997879

Family Applications (1)

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EP05014417A Withdrawn EP1615469A3 (fr) 2004-07-07 2005-07-02 Appareil de cuisson muni d'une détection de temperature et son procédé de détection associé à un appareil de cuisson.

Country Status (2)

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EP (1) EP1615469A3 (fr)
DE (1) DE102004033454A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008148529A1 (fr) * 2007-06-05 2008-12-11 Miele & Cie. Kg Procédé de commande d'une table de cuisson et table de cuisson pour mettre en oeuvre ce procédé
EP2562480A1 (fr) * 2011-08-22 2013-02-27 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de surveillance pour champs de cuisson
WO2014075654A1 (fr) * 2012-11-14 2014-05-22 Haug, Michael Dispositif et procédé pour mesurer un degré de combustion complète de particules dans une installation de combustion
CN104897303A (zh) * 2015-06-30 2015-09-09 广东美的厨房电器制造有限公司 光纤温度传感器、微波加热装置及其加热方法
US10721796B2 (en) * 2015-10-14 2020-07-21 Alessandro Condini Method for controlling a heat source belonging to a cooking apparatus and cooking apparatus configured to carry out said method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021029A1 (de) * 2006-04-28 2007-10-31 E.G.O. Elektro-Gerätebau GmbH Vorrichtung und Verfahren zur Temperaturmessung an einer Induktionsheizvorrichtung
DE102006024097A1 (de) 2006-05-18 2007-11-22 E.G.O. Elektro-Gerätebau GmbH Verwendung von linkshändigen Metamaterialien als Anzeige, insbesondere an einem Kochfeld, und Anzeige sowie Anzeigeverfahren
ES2340643B1 (es) 2007-02-02 2011-04-08 Bsh Electrodomesticos España, S.A. Unidad inductora.
DE102019211292A1 (de) * 2019-07-30 2021-02-04 BSH Hausgeräte GmbH Vorrichtung und Verfahren zur Ermittlung der Temperatur des Inhalts eines Behälters
DE102019211289A1 (de) * 2019-07-30 2021-02-04 BSH Hausgeräte GmbH Vorrichtung und Verfahren zur Ermittlung eines Schätzwertes der Temperatur des Inhalts eines Behälters

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
GB2072334A (en) * 1980-03-24 1981-09-30 Thorn Domestic Appliances Ltd Temperature responsive apparatus
DE3814354A1 (de) * 1988-04-28 1989-11-09 Philips Patentverwaltung Kochgeraet
DE4114369C2 (de) * 1990-05-02 1996-04-11 Keller Gmbh Pyrometer
CH685405A5 (de) * 1992-10-06 1995-06-30 Alusuisse Lonza Services Ag Temperaturmessung mit Zweiwellenlängenpyrometern.
DE19500351A1 (de) * 1995-01-07 1996-07-11 Philips Patentverwaltung Kochgerät
DE19721475A1 (de) * 1997-05-23 1998-11-26 Eko Stahl Gmbh Verfahren zur berührungslosen Temperaturmessung
DE19856140A1 (de) * 1998-12-04 2000-06-08 Bsh Bosch Siemens Hausgeraete Sensorgesteuertes Kochfeld mit unterhalb der Kochfeldplatte angeordneter Sensoreinheit
US6375350B1 (en) * 2000-08-08 2002-04-23 Quantum Logic Corp Range pyrometer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008148529A1 (fr) * 2007-06-05 2008-12-11 Miele & Cie. Kg Procédé de commande d'une table de cuisson et table de cuisson pour mettre en oeuvre ce procédé
US8581159B2 (en) 2007-06-05 2013-11-12 Miele & Cie. Kg Control method for a cooktop and cooktop for carrying out said method
EP2562480A1 (fr) * 2011-08-22 2013-02-27 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de surveillance pour champs de cuisson
WO2014075654A1 (fr) * 2012-11-14 2014-05-22 Haug, Michael Dispositif et procédé pour mesurer un degré de combustion complète de particules dans une installation de combustion
CN104897303A (zh) * 2015-06-30 2015-09-09 广东美的厨房电器制造有限公司 光纤温度传感器、微波加热装置及其加热方法
CN104897303B (zh) * 2015-06-30 2018-07-13 广东美的厨房电器制造有限公司 光纤温度传感器、微波加热装置及其加热方法
US10721796B2 (en) * 2015-10-14 2020-07-21 Alessandro Condini Method for controlling a heat source belonging to a cooking apparatus and cooking apparatus configured to carry out said method

Also Published As

Publication number Publication date
EP1615469A3 (fr) 2007-09-05
DE102004033454A1 (de) 2006-01-26

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