EP1865754A2 - Induction cooking hob and method for determining the temperature of the base of a cooking container - Google Patents

Induction cooking hob and method for determining the temperature of the base of a cooking container Download PDF

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Publication number
EP1865754A2
EP1865754A2 EP07108901A EP07108901A EP1865754A2 EP 1865754 A2 EP1865754 A2 EP 1865754A2 EP 07108901 A EP07108901 A EP 07108901A EP 07108901 A EP07108901 A EP 07108901A EP 1865754 A2 EP1865754 A2 EP 1865754A2
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EP
European Patent Office
Prior art keywords
sensor
preparation
temperature
sensors
cooker according
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Granted
Application number
EP07108901A
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German (de)
French (fr)
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EP1865754B1 (en
EP1865754A3 (en
Inventor
Uwe Has
Peter Vetterl
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication of EP1865754A3 publication Critical patent/EP1865754A3/en
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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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • 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 an induction hob and a method for determining a temperature of a bottom of a preparation container.
  • a preparation container for example a cookware such as a pan or a pot.
  • a preparation container is usually placed on a preparation zone, in particular a cooking zone, a preparation field, in particular a cooktop.
  • sensors are used, which capture essential information about properties of the material to be prepared in the cookware or to essential operating conditions of the hob or cookware.
  • the temperature of the cookware is a detailed information about the operating state of the entire system of radiator and the cooking zone in the hob, which may be formed as a glass ceramic.
  • temperature information about the food to be prepared itself is also recorded.
  • the knowledge of the course of the temperature of the bottom of the preparation container allows control of the preparation temperature, in particular by controlling a heating power of a radiator by means of a control and / or regulating unit.
  • a temperature sensor which is known from radiant cooktops
  • a sensor system can be used, as described in the JP 03208288 A is described.
  • the device comprises two separate infrared sensor units which are positioned on a lower side of the preparation plate.
  • the two sensors are arranged next to each other, wherein the first sensor is designed for temperature detection of the preparation plate.
  • the second sensor is designed to detect the temperature of the bottom of a preparation container, which is placed on top of the preparation plate.
  • a special insert is installed in the preparation plate, which allows a transmission of infrared radiation.
  • the two sensors are thus designed as separate units which detect independent temperature information.
  • the second sensor detects only a radiated from the bottom of the preparation container heat radiation.
  • a cooking unit which has a preparation plate on which a preparation container is placed.
  • two separate and spaced-apart sensors are arranged on the opposite side of the preparation plate.
  • the bottom of the preparation container is inductively heated.
  • One of the two sensors is designed for the detection of thermal radiation, which has both thermal radiation of the bottom of the preparation container and heat radiation of the preparation plate.
  • the second sensor which is designed as well as the first sensor as an IR sensor, is designed for detecting a thermal radiation of a reflector plate.
  • the reflector plate is attached to the underside of the preparation plate and the second sensor is arranged in the immediate vicinity of this reflector plate. Thus, this second sensor detects only heat radiation from this reflector plate.
  • Both sensors are connected to an evaluation unit, wherein in the evaluation unit, a difference signal from the two sensor signals with respect to a temperature determination is generated.
  • An induction cook according to the invention according to the preamble of claim 1 is characterized in that the two sensors are arranged such that their local detection areas at least partially overlapping, in particular substantially completely overlapping, are arranged. Both sensors detect at least in regions in the same area, whereby a much more precise determination of the bottom temperature of the preparation container can be made possible.
  • the two sensors preferably have a same solid angle of the detection range.
  • the detection areas are such that this surface area is formed substantially congruent on the underside of the preparation zone.
  • the detection areas are such that this surface area is formed substantially congruent on the underside of the preparation zone.
  • as a two-channel pyrometer or as a dual-sensor system can then be ensured in addition to the metrological advantages of optimally matched electronics and optics that the two IR sensors "see through" the same spot of the preparation zone.
  • the sensors or the sensor system of the device are or is designed in particular as Bratsensorik and positioned accordingly.
  • the first sensor and / or the IR sensor is arranged on a side facing away from the bottom of the preparation zone.
  • the first sensor is attached to the side facing away from the bottom of the preparation zone and is thus arranged directly on the applied side.
  • the first sensor may be designed as an NTC resistor or as a PTC resistor.
  • the first sensor for detecting measured values for determining the temperature of the preparation zone is also designed as an IR sensor.
  • the two sensors are preferably adjacent and relatively close to each other.
  • the two sensors are arranged in a common housing.
  • the two sensors are preferably arranged in a shielded manner by an induction device, in particular induction coils, provided for the inductive heating.
  • an induction device in particular induction coils, provided for the inductive heating.
  • the housing itself allows such a shield. The detection of the sensors is not affected by the inductive heating. The sensor results are thereby improved.
  • the preparation field is formed as a glass ceramic field.
  • This preparation field is preferably designed as a homogeneous field which has no special detection regions, as is required in the prior art for a corresponding detection through the preparation zone. Such a detection window is thus not required and not provided.
  • both sensors are designed as IR sensors, advantageously a dual-sensor system is realized, which is designed in particular as a two-channel pyrometer.
  • a difference signal can be generated in the evaluation unit, which enables an exact determination of the temperature of the bottom of the preparation container.
  • the IR sensor By a sensor, the IR sensor, generates a signal containing both temperature information of the preparation zone and temperature information of the bottom of the preparation container, thereby a signal is provided which characterizes a mixing temperature.
  • the other sensor is designed and arranged such that it only detects the explicit temperature of the preparation zone. In contrast to the prior art, therefore, precisely the temperature of the preparation zone is detected directly and not the temperature of a reflector plate arranged on a lower side of the preparation zone.
  • the induction cooker With the induction cooker according to the invention, a very accurate determination of the temperature of the bottom of the preparation container can thus be made possible in the evaluation unit, since the temperature component of the preparation zone which is essentially the same amount in both sensor signals can be calculated exactly and simply. Furthermore, no own separate and made of a different material trained detection area in the preparation zone, through which then a sensor can detect the temperature of the soil, as is done in the prior art. Therefore, the preparation zone does not have to be specially designed and made expensive with a recess into which this detection area is introduced.
  • a method for determining a temperature of a bottom of a preparation container for a preparation the preparation container is placed on a preparation zone of a preparation field, wherein the preparation zone is heated inductively. At least one measured value for determining the temperature of the preparation zone is detected by a first sensor, and a thermal radiation of the preparation zone and a heat radiation of the bottom of the preparation container is detected by means of an IR sensor. The temperature information detected by the two sensors is transmitted to an evaluation unit, wherein the temperature of the bottom of the preparation container is determined by means of the evaluation unit depending on this information.
  • Fig. 1 is a schematic perspective view symbolically shown a device 1 for determining a temperature of a bottom 31 of a cooking pot designed as a cooking container 3, which is associated with an induction hob.
  • the device 1 and the cooking pot 3 are positioned on opposite sides of a cooking field 2 designed as a cooking field, which is designed as a glass ceramic plate or glass plate.
  • the hob 2 comprises four preparation zones designed as cooking zones 21, 22, 23 and 24, of which at least the cooking zone 24, on which the cooking pot 3 stands, can be heated inductively.
  • the cooking pot 3 is placed on a top 2a of the hob 2 on the cooking zone 24.
  • the device 1 is positioned at or spaced from a bottom 2b of the hob.
  • FIG. 2 shows a schematic representation of a partial section in which the device 1 has a sensor device.
  • the sensor device comprises a first sensor 11, which is designed as an NTC resistor or as a PTC resistor.
  • This first sensor 11 is arranged directly on the bottom 2b of the hob 2 and designed to detect only the temperature of this hob 2.
  • the temperature of the glass ceramic plate of the hob 2 is thus directly detected directly, without intermediate elements or the like are arranged.
  • the sensor device comprises a second sensor which is designed as an IR sensor 12.
  • the IR sensor 12 is positioned at a distance from the lower side 2b and has a detection area 12a which forms a flat area 12b on the underside 2b of the hob 2.
  • the sensor 11 and the IR sensor 12 are positioned relative to one another such that the first sensor 11 is at least partially also included in the detection area 12a.
  • the sensor 11 and the IR sensor 12 thus detect measured values for a further temperature determination at least in regions from a common measuring spot.
  • the IR sensor 12 is formed by a suitable heat radiation detecting filter which is radiated from both the hob 2 and the bottom 31 of the cooking pot 3.
  • the IR sensor 12 detects a quasi mixed signal, which is composed of the heat radiation of the bottom 31 and the hob 2.
  • the device 1 comprises at least one evaluation unit 13, which is electrically connected to the sensor 11 and the IR sensor 12.
  • the sensor signal of the first sensor 11 which contains exclusively the immediate temperature of the cooktop 2 characterizing measurements
  • the sensor signal with the IR sensor 12 which contains both temperature information of the hob 2 and the bottom 3, compared.
  • the temperature of the bottom 31 of the cooking pot 3 can be determined exactly; the influence of the temperature of the glass ceramic plate can be compensated.
  • inductors 4 in particular induction coils, are schematically illustrated, which are designed for inductive heating of the bottom 31 of the cooking pot 3.
  • the detection sensitivity of the IR sensor 12 is tuned with respect to a detection of the heat radiation and thus a corresponding wavelength range with respect to the homogeneously formed hob 2.
  • the IR sensor 12 can thus also detect through the hob 2 and detect heat radiation of the bottom 31, or the heat radiation of the soil penetrates the glass ceramic into a first specific wavelength range and can be detected by the IR sensor.
  • the influence of the hob 2 can be eliminated from the mixing signal of the IR sensor 12, whereby this can be done in the evaluation unit 13 by an explicit calculation or by a stored characteristic field.
  • the temperature of the bottom 31 can be determined relatively easily and with little effort.
  • the direct detection of the temperature of the hob allows a much more accurate determination of the temperature of the bottom 31st
  • the bottom 31 is minimally positioned to the top 2a of the hob 2 positioned. This is only due to the crowning of the bottom 31 of the saucepan 3 of the case. Otherwise, the cooking pot 3 is placed directly on the top 2a. It can also be provided that the device 1 is arranged at a position in which due to the configuration of the bottom 31 of these rests directly on the top 2a.
  • a device 1 in a schematic manner.
  • the device here comprises two IR sensors 12 and 14, which are designed as separate components. Both IR sensors 12 and 14 are spaced from the bottom 2b of the hob 2 and oriented with their detection areas 12a and 14a in the direction of the hob 2. Moreover, the IR sensors 12 and 14 are positioned such that their detection areas 12a and 14a on the lower surface 2b form surfaces 12b and 14b which overlap on the lower surface 2b in a surface area 15. In this overlapping area 15 thus a common measuring spot is formed. The precision can be improved by such an overlapping configuration of the detection regions 12a and 14a, since at least in regions of a common measuring spot 15 thermal radiation is detected.
  • the IR sensor 12 is again formed by a suitable first filter for detecting thermal radiation of the hob 2 and heat radiation of the bottom 31.
  • the IR sensor 14 is designed in terms of its detection sensitivity and its detectable wavelength range by a suitable second filter such that it only and directly the heat radiation of the hob. 2 can detect.
  • a difference signal from the two sensor signals transmitted by the IR sensors 12 and 14, the temperature of the bottom 31 is determined analogously to the embodiment of FIG.
  • the device 1 comprises a sensor system, which is designed as a two-channel pyrometer, wherein the sensor system 16 is formed as an IR sensor system and is designed for internally separate viewing of two areas.
  • the sensor system 16 are thus not two separate sensors, as implemented in the embodiments of FIG. 2 and FIG. 3, arranged, but these two sensors are practically formed integrally and are both realized in the one sensor system 16.
  • the sensor system 16 is formed on the one hand for the direct detection of the temperature of the hob 2, on the other hand for detecting a mixed signal, which contains heat radiation both of the hob 2 and the bottom 31.
  • the two sensors realized in the sensor system 16 have a substantially identical detection region 16a, which leads to a substantially congruent surface region 16b on the underside 2b. The sensor system 16 or the sensors realized therein thus virtually always observe the same measuring spot.
  • the sensor system 16 is arranged in a housing 17, which enables a shielding of the sensor system 16 against inductive influences of the inductors 4.
  • This housing 17 may also be formed in the embodiments according to FIGS. 2 and 3.
  • the provided for detecting the temperature of the hob 2 sensors 11, 14 and the sensor system 16 are preferably designed such that over the entire height h of the cooktop 2 averaged temperature is detectable. It can also be provided that these sensors 11, 14 and the corresponding sensor of the sensor system 16 are designed only for detecting the temperature of the underside 2b of the hob 2.
  • the hob 2 may be formed, for example, as a glass ceramic cooking surface, which is, for example, materially such that a transmittance of about 45% to 55% in a thermal radiation having a wavelength of about 1.5 microns to about 2.7 microns is given. Furthermore, this hob 2 can also have a transmittance of about 37% to about 40% at a wavelength of about 3.5 microns to about 4 microns of heat radiation.
  • the IR sensors 12 and 16 then preferably have a detection sensitivity corresponding to this range. The details are merely exemplary and may vary depending on the material of the hob 2, which is why then the detection sensitivity of the IR sensors 12 and 16 and their filters are to be changed accordingly.

Abstract

The pan has two sensors arranged in such a manner that local detection areas (12a) are completely overlapped. A sensor (11) and another sensor as an infrared sensor (12) are arranged on a base (31) turned on the rear side of the preparing zone (2b). The sensor is attached to the base. The two sensors are arranged by an induction device (4) shielded for inductive heating of the preparing zone. An independent claim is also included for a method for determining the temperature of a preparing container base.

Description

Die Erfindung betrifft eine Induktionskochmulde und ein Verfahren zur Ermittlung einer Temperatur eines Bodens eines Zubereitungsbehälters.The invention relates to an induction hob and a method for determining a temperature of a bottom of a preparation container.

Beim Zubereiten von verzehrbaren Zubereitungsgut und somit Lebensmitteln, werden diese im Allgemeinen in ein Zubereitungsbehältnis, beispielsweise ein Kochgeschirr, wie eine Pfanne oder einen Topf, eingebracht und darin zubereitet. Ein Zubereitungsbehälter wird dabei üblicherweise auf einer Zubereitungszone, insbesondere einer Kochzone, eines Zubereitungsfeldes, insbesondere eines Kochfeldes, abgestellt. In modernen Kochfeldern kommen Sensoren zum Einsatz, welche wesentliche Informationen zu Eigenschaften des zuzubereitendes Gutes im Kochgeschirr bzw. zu wesentlichen Betriebszuständen des Kochfeldes oder des Kochgeschirrs erfassen.When preparing consumable items to be prepared, and thus foods, these are generally incorporated into and prepared in a preparation container, for example a cookware such as a pan or a pot. A preparation container is usually placed on a preparation zone, in particular a cooking zone, a preparation field, in particular a cooktop. In modern hobs sensors are used, which capture essential information about properties of the material to be prepared in the cookware or to essential operating conditions of the hob or cookware.

Bei Kochfelder mit Strahlungsheizkörpern ist die Temperatur des Kochgeschirrbodens eine ausführliche Information über den Betriebszustand des gesamten Systems aus Heizkörper und der Zubereitungszone im Kochfeld, welche als Glaskeramik ausgebildet sein kann. Darüber hinaus werden auch Temperaturinformationen über das zuzubereitende Lebensmittel selbst erfasst. Die Kenntnis des Verlaufs der Temperatur des Bodens des Zubereitungsbehälters erlaubt eine Regelung der Zubereitungstemperatur, indem insbesondere eine Heizleistung eines Heizkörpers mittels einer Steuer- und/oder Regeleinheit geregelt wird.For hobs with radiant heaters, the temperature of the cookware is a detailed information about the operating state of the entire system of radiator and the cooking zone in the hob, which may be formed as a glass ceramic. In addition, temperature information about the food to be prepared itself is also recorded. The knowledge of the course of the temperature of the bottom of the preparation container allows control of the preparation temperature, in particular by controlling a heating power of a radiator by means of a control and / or regulating unit.

In Induktionsmulden bzw. bei Zubereitungszonen, welche induktiv heizbar sind, ist eine derartige Temperatursensorik, welche aus Strahlungs-Kochfeldern bekannt ist, nicht einsetzbar. Zur Ermittlung einer Temperatur eines Bodens eines Zubereitungsbehälters bei induktiv geheizten Zubereitungszonen kann eine Sensorik verwendet werden, wie sie in der JP 03208288 A beschrieben ist. Die Vorrichtung umfasst zwei separate Infrarot-Sensoreinheiten, welche an einer Unterseite der Zubereitungsplatte positioniert sind. Die beiden Sensoren sind nebeneinander angeordnet, wobei der erste Sensor zur Temperaturerfassung der Zubereitungsplatte ausgebildet ist. Der zweite Sensor ist ausgebildet zur Erfassung der Temperatur des Bodens eines Zubereitungsbehälters, welcher auf der Oberseite der Zubereitungsplatte aufgestellt ist. Dazu ist in der Zubereitungsplatte ein spezielles Einsatzteil eingebaut, welches eine Transmission von Infrarotstrahlung ermöglicht. Die beiden Sensoren sind somit als separate Einheiten ausgebildet, welche unabhängige Temperaturinformationen detektieren. Der zweite Sensor detektiert ausschließlich eine vom Boden des Zubereitungsbehälters abgestrahlte Wärmestrahlung.In induction wells or preparation zones, which are inductively heated, such a temperature sensor, which is known from radiant cooktops, can not be used. To determine a temperature of a bottom of a preparation container in inductively heated preparation zones, a sensor system can be used, as described in the JP 03208288 A is described. The device comprises two separate infrared sensor units which are positioned on a lower side of the preparation plate. The two sensors are arranged next to each other, wherein the first sensor is designed for temperature detection of the preparation plate. The second sensor is designed to detect the temperature of the bottom of a preparation container, which is placed on top of the preparation plate. For this purpose, a special insert is installed in the preparation plate, which allows a transmission of infrared radiation. The two sensors are thus designed as separate units which detect independent temperature information. The second sensor detects only a radiated from the bottom of the preparation container heat radiation.

Darüber hinaus ist aus der JP 2003347028 A eine Kocheinheit bekannt, welche eine Zubereitungsplatte aufweist, auf der ein Zubereitungsbehälter abgestellt ist. An der gegenüberliegenden Seite der Zubereitungsplatte sind zwei separate und beabstandet zueinander angeordnete Sensoren angeordnet. Der Boden des Zubereitungsbehälters ist induktiv heizbar. Einer der beiden Sensoren ist zur Detektion einer Wärmestrahlung ausgebildet, welche sowohl Wärmestrahlung des Bodens des Zubereitungsbehälters als auch Wärmestrahlung der Zubereitungsplatte aufweist. Der zweite Sensor, welcher ebenso wie der erste Sensor als IR-Sensor ausgebildet ist, ist zur Detektion einer Wärmestrahlung einer Reflektorplatte ausgebildet. Die Reflektorplatte ist dabei an der Unterseite der Zubereitungsplatte angebracht und der zweite Sensor ist in unmittelbarer Nähe zu dieser Reflektorplatte angeordnet. Somit detektiert dieser zweite Sensor lediglich Wärmestrahlung von dieser Reflektorplatte. Beide Sensoren sind mit einer Auswerteeinheit verbunden, wobei in der Auswerteeinheit ein Differenzsignal aus den beiden Sensorsignalen im Hinblick auf eine Temperaturermittlung erzeugt wird.In addition, from the JP 2003347028 A a cooking unit is known, which has a preparation plate on which a preparation container is placed. On the opposite side of the preparation plate two separate and spaced-apart sensors are arranged. The bottom of the preparation container is inductively heated. One of the two sensors is designed for the detection of thermal radiation, which has both thermal radiation of the bottom of the preparation container and heat radiation of the preparation plate. The second sensor, which is designed as well as the first sensor as an IR sensor, is designed for detecting a thermal radiation of a reflector plate. The reflector plate is attached to the underside of the preparation plate and the second sensor is arranged in the immediate vicinity of this reflector plate. Thus, this second sensor detects only heat radiation from this reflector plate. Both sensors are connected to an evaluation unit, wherein in the evaluation unit, a difference signal from the two sensor signals with respect to a temperature determination is generated.

Daher ist es Aufgabe der vorliegenden Erfindung, eine Induktionskochmulde und ein Verfahren zu schaffen, mit welcher bzw. mit welchem die Temperatur eines Bodens eines Zubereitungsbehälters genauer bestimmt werden kann.Therefore, it is an object of the present invention to provide an induction hob and a method by which the temperature of a bottom of a preparation container can be determined more accurately.

Diese Aufgabe wird durch eine Induktionskochmulde, welche die Merkmale nach Patentanspruch 1 aufweist, und ein Verfahren, welches die Merkmale nach Patentanspruch 12 aufweist, gelöst.This object is achieved by an induction hob, which has the features of claim 1, and a method having the features of claim 12.

Eine lösungsgemäße Induktionskochmulde gemäß dem Oberbegriff des Patentanspruchs 1 ist dadurch gekennzeichnet, dass die beiden Sensoren derart angeordnet sind, dass ihre örtlichen Erfassungsbereiche zumindest bereichsweise überlappend, insbesondere im Wesentlichen vollständig überlappend, angeordnet sind. Beide Sensoren detektieren zumindest bereichsweise im selben Flächenbereich, wodurch eine wesentlich präzisere Ermittlung der Bodentemperatur des Zubereitungsbehälters ermöglicht werden kann.An induction cook according to the invention according to the preamble of claim 1 is characterized in that the two sensors are arranged such that their local detection areas at least partially overlapping, in particular substantially completely overlapping, are arranged. Both sensors detect at least in regions in the same area, whereby a much more precise determination of the bottom temperature of the preparation container can be made possible.

Die beiden Sensoren weisen bevorzugt einen gleichen Raumwinkel des Erfassungsbereichs auf. Insbesondere ist es vorteilhaft, wenn die beiden Sensoren derart angeordnet sind, dass ihre Erfassungsbereiche an einer Unterseite der Zubereitungszone einen gemeinsamen überlappenden Flächenbereich aufweisen.The two sensors preferably have a same solid angle of the detection range. In particular, it is advantageous if the two sensors are arranged in such a way that their detection areas have a common overlapping surface area on an underside of the preparation zone.

Bevorzugt sind die Erfassungsbereiche derart, dass dieser Flächenbereich auf der Unterseite der Zubereitungszone im Wesentlichen deckungsgleich ausgebildet ist. Insbesondere bei einer Ausgestaltung als Zwei-Kanal-Pyrometer bzw. als Dual-Sensorsystem kann dann neben den messtechnischen Vorteilen von optimal aufeinander abgestimmten Elektroniken und Optiken gewährleistet werden, dass die beiden IR-Sensoren durch den selben Messfleck der Zubereitungszone "hindurchsehen".Preferably, the detection areas are such that this surface area is formed substantially congruent on the underside of the preparation zone. In particular, in one embodiment as a two-channel pyrometer or as a dual-sensor system can then be ensured in addition to the metrological advantages of optimally matched electronics and optics that the two IR sensors "see through" the same spot of the preparation zone.

Die Sensoren bzw. das Sensorsystem der Vorrichtung sind bzw. ist insbesondere als Bratsensorik ausgebildet und entsprechend positioniert.The sensors or the sensor system of the device are or is designed in particular as Bratsensorik and positioned accordingly.

Bevorzugt ist der erste Sensor und/oder der IR-Sensor auf einer dem Boden abgewandten Seite der Zubereitungszone angeordnet. Dort kann bevorzugt eine Anordnung ausgebildet sein, bei welcher zumindest ein Sensor beabstandet zu dieser abgewandten Seite positioniert ist.Preferably, the first sensor and / or the IR sensor is arranged on a side facing away from the bottom of the preparation zone. There may preferably be formed an arrangement in which at least one sensor is positioned at a distance from this side facing away.

Es kann auch vorgesehen sein, dass der erste Sensor an der dem Boden abgewandten Seite der Zubereitungszone befestigt ist und somit unmittelbar an der angewandten Seite angeordnet ist. Der erste Sensor kann als NTC-Widerstand oder als PTC-Widerstand ausgebildet sein. Es kann auch vorgesehen sein, dass auch der erste Sensor zur Erfassung Messwerte zur Bestimmung der Temperatur der Zubereitungszone als IR-Sensor ausgebildet ist.It can also be provided that the first sensor is attached to the side facing away from the bottom of the preparation zone and is thus arranged directly on the applied side. The first sensor may be designed as an NTC resistor or as a PTC resistor. It can also be provided that the first sensor for detecting measured values for determining the temperature of the preparation zone is also designed as an IR sensor.

Die beiden Sensoren sind bevorzugt benachbart und relativ nahe zueinander angeordnet.The two sensors are preferably adjacent and relatively close to each other.

Bevorzugt sind die beiden Sensoren in einem gemeinsamen Gehäuse angeordnet. Die beiden Sensoren sind darüber hinaus in bevorzugter Weise von einer für die induktive Heizung vorgesehenen Induktionsvorrichtung, insbesondere Induktionsspulen, abgeschirmt angeordnet. Bevorzugt kann dabei vorgesehen sein, dass das Gehäuse selbst eine derartige Abschirmung ermöglicht. Die Erfassung der Sensoren wird dadurch durch die induktive Heizung nicht beeinflusst. Die Sensorergebnisse werden dadurch verbessert.Preferably, the two sensors are arranged in a common housing. In addition, the two sensors are preferably arranged in a shielded manner by an induction device, in particular induction coils, provided for the inductive heating. Preferably, it can be provided that the housing itself allows such a shield. The detection of the sensors is not affected by the inductive heating. The sensor results are thereby improved.

In bevorzugter Weise ist das Zubereitungsfeld als Glaskeramikfeld ausgebildet. Bevorzugt ist dieses Zubereitungsfeld als homogenes Feld ausgebildet, welches keine speziellen Detektionsbereiche aufweist, wie dies im Stand der Technik für eine entsprechende Detektion durch die Zubereitungszone hindurch erforderlich ist. Ein derartiges Detektionsfenster ist somit nicht erforderlich und nicht vorgesehen.Preferably, the preparation field is formed as a glass ceramic field. This preparation field is preferably designed as a homogeneous field which has no special detection regions, as is required in the prior art for a corresponding detection through the preparation zone. Such a detection window is thus not required and not provided.

Sind beide Sensoren als IR-Sensoren ausgebildet, so ist in vorteilhafter Weise ein Dual-Sensorsystem realisiert, welches insbesondere als Zwei-Kanal-Pyrometer ausgebildet ist.If both sensors are designed as IR sensors, advantageously a dual-sensor system is realized, which is designed in particular as a two-channel pyrometer.

Bei der vorgeschlagenen Induktionskochmulde ist ein Differenzsignal in der Auswerteeinheit erzeugbar, welches eine exakte Ermittlung der Temperatur des Bodens des Zubereitungsbehälters ermöglicht. Indem ein Sensor, der IR-Sensor, ein Signal erzeugt, welches sowohl Temperaturinformationen der Zubereitungszone als auch Temperaturinformationen des Bodens des Zubereitungsbehälters enthält, wird dadurch ein Signal bereitgestellt, welches eine Mischtemperatur charakterisiert. Der andere Sensor ist derart ausgebildet und angeordnet, dass er lediglich die explizite Temperatur der Zubereitungszone erfasst. Im Unterschied zum Stand der Technik wird somit genau die Temperatur der Zubereitungszone unmittelbar und nicht die Temperatur einer an einer Unterseite der Zubereitungszone angeordneten Reflektorplatte erfasst. Mit der lösungsgemäßen Induktionskochmulde kann somit in der Auswerteeinheit ein sehr genaues Ermitteln der Temperatur des Bodens des Zubereitungsbehälters ermöglicht werden, da der in beiden Sensorsignalen im Wesentlichen mit gleichen Betrag vorhandene Temperaturanteil der Zubereitungszone exakt und einfach herausgerechnet werden kann. Des Weiteren muss kein eigener separater und aus einem anderen Material ausgebildeter Detektionsbereich in der Zubereitungszone ausgebildet werden, durch welchen dann ein Sensor die Temperatur des Bodens erfassen kann, wie dies im Stand der Technik erfolgt. Die Zubereitungszone muss daher nicht eigens mit einer Aussparung ausgebildet und aufwändig gefertigt werden, in die dieser Detektionsbereich eingebracht wird.In the proposed induction hob, a difference signal can be generated in the evaluation unit, which enables an exact determination of the temperature of the bottom of the preparation container. By a sensor, the IR sensor, generates a signal containing both temperature information of the preparation zone and temperature information of the bottom of the preparation container, thereby a signal is provided which characterizes a mixing temperature. The other sensor is designed and arranged such that it only detects the explicit temperature of the preparation zone. In contrast to the prior art, therefore, precisely the temperature of the preparation zone is detected directly and not the temperature of a reflector plate arranged on a lower side of the preparation zone. With the induction cooker according to the invention, a very accurate determination of the temperature of the bottom of the preparation container can thus be made possible in the evaluation unit, since the temperature component of the preparation zone which is essentially the same amount in both sensor signals can be calculated exactly and simply. Furthermore, no own separate and made of a different material trained detection area in the preparation zone, through which then a sensor can detect the temperature of the soil, as is done in the prior art. Therefore, the preparation zone does not have to be specially designed and made expensive with a recess into which this detection area is introduced.

Bei einem Verfahren zum Ermitteln einer Temperatur eines Bodens eines Zubereitungsbehälters für ein Zubereitungsgut wird der Zubereitungsbehälter auf eine Zubereitungszone eines Zubereitungsfeldes aufgestellt, wobei die Zubereitungszone induktiv geheizt wird. Zumindest ein Messwert zur Bestimmung der Temperatur der Zubereitungszone wird mit einem ersten Sensor erfasst und eine Wärmestrahlung der Zubereitungszone sowie eine Wärmestrahlung des Bodens des Zubereitungsbehälters wird mittels einem IR-Sensor erfasst. Die von den beiden Sensoren detektierten Temperaturinformationen werden an eine Auswerteeinheit übertragen, wobei mittels der Auswerteeinheit abhängig von diesen Informationen die Temperatur des Bodens des Zubereitungsbehälters ermittelt wird. Durch das lösungsgemäße Verfahren kann eine relativ einfache und dennoch sehr präzise Ermittlung der Temperatur des Bodens des Zubereitungsbehälters erreicht werden.In a method for determining a temperature of a bottom of a preparation container for a preparation, the preparation container is placed on a preparation zone of a preparation field, wherein the preparation zone is heated inductively. At least one measured value for determining the temperature of the preparation zone is detected by a first sensor, and a thermal radiation of the preparation zone and a heat radiation of the bottom of the preparation container is detected by means of an IR sensor. The temperature information detected by the two sensors is transmitted to an evaluation unit, wherein the temperature of the bottom of the preparation container is determined by means of the evaluation unit depending on this information. By the method according to the solution a relatively simple and nevertheless very precise determination of the temperature of the bottom of the preparation container can be achieved.

Durch die induktive Kopplung des Bodens des Zubereitungsbehälters wird dieser aufgeheizt. Die dann von dem Boden abgestrahlte Wärmestrahlung erwärmt dann auch die Zubereitungszone, insbesondere die Glaskeramik, wodurch sowohl von der Zubereitungszone als auch von dem Boden Wärmestrahlung abgestrahlt wird. Diese Wärmestrahlungen werden als Mischsignal von dem IR-Sensor detektiert. Der erste Sensor detektiert lediglich Messwerte, die die Temperatur der erwärmten Zubereitungszone charakterisieren.By the inductive coupling of the bottom of the preparation container this is heated. The heat radiation then radiated from the bottom then also heats the preparation zone, in particular the glass ceramic, whereby radiant heat is emitted both from the preparation zone and from the floor. These thermal radiations are detected as a mixed signal from the IR sensor. The first sensor only detects measurements that characterize the temperature of the heated preparation zone.

Vorteilhafte Ausgestaltungen der erfindungsgemäßen Induktionskochmulde sind als vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens anzusehen.Advantageous embodiments of the induction hob according to the invention are to be regarded as advantageous embodiments of the method according to the invention.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand schematischer Zeichnungen näher erläutert. Es zeigen:

Fig. 1
eine perspektivische Darstellung eines Zubereitungsfeldes mit einem Zubereitungsbehälter und einer erfindungsgemäßen Vorrichtung;
Fig. 2
eine schematische Darstellung eines ersten Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung;
Fig. 3
ein zweites Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung; und
Fig. 4
ein drittes Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung.
Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:
Fig. 1
a perspective view of a preparation field with a preparation container and a device according to the invention;
Fig. 2
a schematic representation of a first embodiment of a device according to the invention;
Fig. 3
a second embodiment of a device according to the invention; and
Fig. 4
A third embodiment of a device according to the invention.

In den Figuren werden gleiche oder funktionsgleiche Elemente mit den gleichen Bezugszeichen versehen.In the figures, identical or functionally identical elements are provided with the same reference numerals.

In Fig. 1 ist in schematischer perspektivischer Darstellung symbolisch eine Vorrichtung 1 zur Ermittlung einer Temperatur eines Bodens 31 eines als Kochtopf 3 ausgebildeten Zubereitungsbehälters gezeigt, welche einer Induktionskochmulde zugeordnet ist. Die Vorrichtung 1 und der Kochtopf 3 sind an gegenüberliegenden Seiten eines als Kochfeld 2 ausgebildeten Zubereitungsfelds, welches als Glaskeramikplatte oder Glasplatte ausgebildet ist, positioniert. Das Kochfeld 2 umfasst im Ausführungsbeispiel vier als Kochzonen 21, 22, 23 und 24 ausgebildete Zubereitungszonen, von denen zumindest die Kochzone 24, auf welcher der Kochtopf 3 steht, induktiv heizbar ist. Der Kochtopf 3 ist dabei an einer Oberseite 2a des Kochfeldes 2 auf der Kochzone 24 aufgestellt. Die Vorrichtung 1 ist an oder beabstandet zu einer Unterseite 2b des Kochfeldes positioniert.In Fig. 1 is a schematic perspective view symbolically shown a device 1 for determining a temperature of a bottom 31 of a cooking pot designed as a cooking container 3, which is associated with an induction hob. The device 1 and the cooking pot 3 are positioned on opposite sides of a cooking field 2 designed as a cooking field, which is designed as a glass ceramic plate or glass plate. In the exemplary embodiment, the hob 2 comprises four preparation zones designed as cooking zones 21, 22, 23 and 24, of which at least the cooking zone 24, on which the cooking pot 3 stands, can be heated inductively. The cooking pot 3 is placed on a top 2a of the hob 2 on the cooking zone 24. The device 1 is positioned at or spaced from a bottom 2b of the hob.

Die in Fig. 1 lediglich als Blockelement dargestellte Vorrichtung 1 wird in Fig. 2 gemäß einem ersten Ausführungsbeispiel näher erläutert. In Fig. 2 ist eine schematische Darstellung eines Teilausschnitts gezeigt, bei dem die Vorrichtung 1 eine Sensorvorrichtung aufweist. Die Sensorvorrichtung umfasst einen ersten Sensor 11, welcher als NTC-Widerstand oder als PTC-Widerstand ausgebildet ist. Dieser erste Sensor 11 ist an der Unterseite 2b des Kochfeldes 2 unmittelbar angeordnet und zur Erfassung ausschließlich der Temperatur dieses Kochfeldes 2 ausgebildet. Durch diesen Sensor 11 wird somit direkt die Temperatur der Glaskeramikplatte des Kochfeldes 2 unmittelbar erfasst, ohne dass Zwischenelemente oder dergleichen angeordnet sind.The device 1 illustrated only in FIG. 1 as a block element is explained in more detail in FIG. 2 according to a first exemplary embodiment. FIG. 2 shows a schematic representation of a partial section in which the device 1 has a sensor device. The sensor device comprises a first sensor 11, which is designed as an NTC resistor or as a PTC resistor. This first sensor 11 is arranged directly on the bottom 2b of the hob 2 and designed to detect only the temperature of this hob 2. By this sensor 11, the temperature of the glass ceramic plate of the hob 2 is thus directly detected directly, without intermediate elements or the like are arranged.

Darüber hinaus umfasst die Sensorvorrichtung einen zweiten Sensor, welcher als IR-Sensor 12 ausgebildet ist. Der IR-Sensor 12 ist beabstandet zur Unterseite 2b positioniert und weist einen Erfassungsbereich 12a auf, welcher an der Unterseite 2b des Kochfeldes 2 einen flächigen Bereich 12b ausbildet. Wie dabei zu erkennen ist, ist der Sensor 11 und der IR-Sensor 12 derart zueinander positioniert, dass der erste Sensor 11 zumindest teilweise auch im Erfassungsbereich 12a enthalten ist. Der Sensor 11 und der IR-Sensor 12 detektieren somit Messwerte für eine weitere Temperaturermittlung zumindest bereichsweise von einem gemeinsamen Messfleck. Der IR-Sensor 12 ist durch einen geeigneten Filter zur Detektion von Wärmestrahlung ausgebildet, welche sowohl von dem Kochfeld 2 als auch von dem Boden 31 des Kochtopfs 3 abgestrahlt wird. Somit detektiert der IR-Sensor 12 quasi ein Mischsignal, welches sich aus den Wärmestrahlungen des Bodens 31 als auch des Kochfeldes 2 zusammensetzt.In addition, the sensor device comprises a second sensor which is designed as an IR sensor 12. The IR sensor 12 is positioned at a distance from the lower side 2b and has a detection area 12a which forms a flat area 12b on the underside 2b of the hob 2. As can be seen, the sensor 11 and the IR sensor 12 are positioned relative to one another such that the first sensor 11 is at least partially also included in the detection area 12a. The sensor 11 and the IR sensor 12 thus detect measured values for a further temperature determination at least in regions from a common measuring spot. The IR sensor 12 is formed by a suitable heat radiation detecting filter which is radiated from both the hob 2 and the bottom 31 of the cooking pot 3. Thus, the IR sensor 12 detects a quasi mixed signal, which is composed of the heat radiation of the bottom 31 and the hob 2.

Darüber hinaus umfasst die Vorrichtung 1 zumindest eine Auswerteeinheit 13, welche mit dem Sensor 11 und dem IR-Sensor 12 elektrisch verbunden ist. Mittels dieser Auswerteeinheit 13 wird das Sensorsignal des ersten Sensors 11, welches ausschließlich die unmittelbare Temperatur des Kochfeldes 2 charakterisierende Messwerte enthält, mit dem Sensorsignal mit dem IR-Sensors 12, welches sowohl Temperaturinformationen des Kochfeldes 2 als auch des Bodens 3 enthält, verglichen. Beispielsweise durch Differenzbildung dieser beiden Signale kann die Temperatur des Bodens 31 des Kochtopfes 3 exakt ermittelt werden; der Einfluss der Temperatur der Glaskeramikplatte kann kompensiert werden.In addition, the device 1 comprises at least one evaluation unit 13, which is electrically connected to the sensor 11 and the IR sensor 12. By means of this evaluation unit 13, the sensor signal of the first sensor 11, which contains exclusively the immediate temperature of the cooktop 2 characterizing measurements, with the sensor signal with the IR sensor 12, which contains both temperature information of the hob 2 and the bottom 3, compared. For example, by subtraction of these two signals, the temperature of the bottom 31 of the cooking pot 3 can be determined exactly; the influence of the temperature of the glass ceramic plate can be compensated.

In Fig. 2 sind auch in schematischer Weise Induktoren 4, insbesondere Induktionsspulen, schematisch dargestellt, welche zur induktiven Heizung des Bodens 31 des Kochtopfs 3 ausgebildet sind.In FIG. 2, inductors 4, in particular induction coils, are schematically illustrated, which are designed for inductive heating of the bottom 31 of the cooking pot 3.

In der gezeigten Ausführung gemäß Fig. 2 ist die Detektionsempfindlichkeit des IR-Sensors 12 im Hinblick auf eine Detektion der Wärmestrahlung und somit eines entsprechenden Wellenlängenbereichs bezüglich des homogen ausgebildeten Kochfeldes 2 abgestimmt. Der IR-Sensor 12 kann somit auch durch das Kochfeld 2 hindurch detektieren und Wärmestrahlung des Bodens 31 erfassen, bzw. die Wärmestrahlung des Bodens durchdringt in einen ersten bestimmten Wellenlängenbereich die Glaskeramik und kann von den IR-Sensor detektiert weden.In the embodiment shown in FIG. 2, the detection sensitivity of the IR sensor 12 is tuned with respect to a detection of the heat radiation and thus a corresponding wavelength range with respect to the homogeneously formed hob 2. The IR sensor 12 can thus also detect through the hob 2 and detect heat radiation of the bottom 31, or the heat radiation of the soil penetrates the glass ceramic into a first specific wavelength range and can be detected by the IR sensor.

Mit der aus der direkten Messung exakt bekannten Temperatur des Kochfeldes 2 kann aus dem Mischsignal des IR-Sensors 12 der Einfluss des Kochfeldes 2 eliminiert werden, wobei dies in der Auswerteeinheit 13 durch eine explizite Rechnung oder durch ein abgelegtes Kennfeld erfolgen kann. Dadurch ist die Temperatur des Bodens 31 relativ einfach und aufwandsarm bestimmbar. Die direkte Erfassung der Temperatur des Kochfeldes ermöglicht eine wesentlich präzisere Bestimmung der Temperatur des Bodens 31.With the temperature of the hob 2 exactly known from the direct measurement, the influence of the hob 2 can be eliminated from the mixing signal of the IR sensor 12, whereby this can be done in the evaluation unit 13 by an explicit calculation or by a stored characteristic field. As a result, the temperature of the bottom 31 can be determined relatively easily and with little effort. The direct detection of the temperature of the hob allows a much more accurate determination of the temperature of the bottom 31st

Bei der in Fig. 2 gezeigten Darstellung ist der Boden 31 minimal beabstandet zur Oberseite 2a des Kochfeldes 2 positioniert. Dies ist lediglich aufgrund der Bombierung des Bodens 31 des Kochtopfes 3 der Fall. Ansonsten ist der Kochtopf 3 unmittelbar auf der Oberseite 2a abgestellt. Es kann auch vorgesehen sein, dass die Vorrichtung 1 an einer Position angeordnet ist, bei der aufgrund der Ausgestaltung des Bodens 31 dieser unmittelbar auf der Oberseite 2a aufliegt.In the illustration shown in Fig. 2, the bottom 31 is minimally positioned to the top 2a of the hob 2 positioned. This is only due to the crowning of the bottom 31 of the saucepan 3 of the case. Otherwise, the cooking pot 3 is placed directly on the top 2a. It can also be provided that the device 1 is arranged at a position in which due to the configuration of the bottom 31 of these rests directly on the top 2a.

In Fig. 3 ist ein weiteres Ausführungsbeispiel einer Vorrichtung 1 in schematischer Weise dargestellt. Im Unterschied zur Ausgestaltung gemäß Fig. 2 umfasst die Vorrichtung hier zwei IR-Sensoren 12 und 14, welche als separate Komponenten ausgebildet sind. Beide IR-Sensoren 12 und 14 sind beabstandet zur Unterseite 2b des Kochfeldes 2 angeordnet und mit ihren Erfassungsbereichen 12a und 14a in Richtung des Kochfeldes 2 orientiert. Darüber hinaus sind die IR-Sensoren 12 und 14 derart positioniert, dass ihre Erfassungsbereiche 12a und 14a auf der Unterseite 2b Flächen 12b und 14b ausbilden, welche an der Unterseite 2b in einem Flächenbereich 15 überlappen. In diesem überlappenden Flächenbereich 15 wird somit ein gemeinsamer Messfleck ausgebildet. Die Präzision kann durch eine derartige überlappende Ausgestaltung der Erfassungsbereiche 12a und 14a verbessert werden, da zumindest bereichsweise von einem gemeinsamen Messfleck 15 Wärmestrahlung detektiert wird.In Fig. 3, another embodiment of a device 1 is shown in a schematic manner. In contrast to the embodiment according to FIG. 2, the device here comprises two IR sensors 12 and 14, which are designed as separate components. Both IR sensors 12 and 14 are spaced from the bottom 2b of the hob 2 and oriented with their detection areas 12a and 14a in the direction of the hob 2. Moreover, the IR sensors 12 and 14 are positioned such that their detection areas 12a and 14a on the lower surface 2b form surfaces 12b and 14b which overlap on the lower surface 2b in a surface area 15. In this overlapping area 15 thus a common measuring spot is formed. The precision can be improved by such an overlapping configuration of the detection regions 12a and 14a, since at least in regions of a common measuring spot 15 thermal radiation is detected.

Der IR-Sensor 12 ist durch einen geeigneten ersten Filter wiederum zur Detektion von Wärmestrahlung des Kochfeldes 2 und von Wärmestrahlung des Bodens 31 ausgebildet. Der IR-Sensor 14 ist im Hinblick auf seine Detektionsempfindlichkeit und seinen detektierbaren Wellenlängenbereich durch einen geeigneten zweiten Filter derart ausgestaltet, dass er lediglich und unmittelbar die Wärmestrahlung des Kochfeldes 2 detektieren kann. In der Auswerteeinheit 13 wird analog zur Ausgestaltung gemäß Fig. 2 wiederum ein Differenzsignal aus den beiden von den IR-Sensoren 12 und 14 übertragenen Sensorsignalen die Temperatur des Bodens 31 ermittelt.The IR sensor 12 is again formed by a suitable first filter for detecting thermal radiation of the hob 2 and heat radiation of the bottom 31. The IR sensor 14 is designed in terms of its detection sensitivity and its detectable wavelength range by a suitable second filter such that it only and directly the heat radiation of the hob. 2 can detect. In the evaluation unit 13, a difference signal from the two sensor signals transmitted by the IR sensors 12 and 14, the temperature of the bottom 31 is determined analogously to the embodiment of FIG.

Eine weitere Ausgestaltung der Vorrichtung 1 ist in der schematischen Darstellung gemäß Fig. 4 gezeigt. Bei dieser Ausgestaltung umfasst die Vorrichtung 1 ein Sensorsystem, welches als Zwei-Kanal-Pyrometer ausgebildet ist, wobei das Sensorsystem 16 als IR-Sensorsystem ausgebildet ist und zur intern getrennten Betrachtung von zwei Bereichen ausgebildet ist. Bei diesem Sensorsystem 16 werden somit nicht zwei separate Sensoren, wie dies in den Ausführungen gemäß Fig. 2 und Fig. 3 realisiert ist, angeordnet, sondern diese beiden Sensoren werden praktisch integral ausgebildet und sind beide in dem einen Sensorsystem 16 realisiert. Das Sensorsystem 16 ist dabei einerseits zur unmittelbaren Detektion der Temperatur des Kochfeldes 2 ausgebildet, andererseits zur Erfassung eines Mischsignals, welches Wärmestrahlung sowohl des Kochfeldes 2 als auch des Bodens 31 enthält. Die beiden in dem Sensorsystem 16 realisierten Sensoren weisen bei dieser Ausgestaltung einen im Wesentlichen gleichen Erfassungsbereich 16a auf, welcher auf der Unterseite 2b zu einem im Wesentlichen deckungsgleichen Flächenbereich 16b führt. Das Sensorsystem 16 bzw. die darin realisierten Sensoren beobachten somit quasi stets den gleichen Messfleck.A further embodiment of the device 1 is shown in the schematic representation of FIG. 4. In this embodiment, the device 1 comprises a sensor system, which is designed as a two-channel pyrometer, wherein the sensor system 16 is formed as an IR sensor system and is designed for internally separate viewing of two areas. In this sensor system 16 are thus not two separate sensors, as implemented in the embodiments of FIG. 2 and FIG. 3, arranged, but these two sensors are practically formed integrally and are both realized in the one sensor system 16. The sensor system 16 is formed on the one hand for the direct detection of the temperature of the hob 2, on the other hand for detecting a mixed signal, which contains heat radiation both of the hob 2 and the bottom 31. In this embodiment, the two sensors realized in the sensor system 16 have a substantially identical detection region 16a, which leads to a substantially congruent surface region 16b on the underside 2b. The sensor system 16 or the sensors realized therein thus virtually always observe the same measuring spot.

Bei der Ausgestaltung in Fig. 4 ist das Sensorsystem 16 in einem Gehäuse 17 angeordnet, welches eine Abschirmung des Sensorsystems 16 vor induktiven Einflüssen der Induktoren 4 ermöglicht. Dieses Gehäuse 17 kann auch bei den Ausgestaltungen gemäß Fig. 2 und Fig. 3 ausgebildet sein.In the embodiment in FIG. 4, the sensor system 16 is arranged in a housing 17, which enables a shielding of the sensor system 16 against inductive influences of the inductors 4. This housing 17 may also be formed in the embodiments according to FIGS. 2 and 3.

Die für die Erfassung der Temperatur des Kochfeldes 2 vorgesehenen Sensoren 11, 14 und der des Sensorsystems 16 sind bevorzugt derart ausgebildet, dass eine über die gesamte Höhe h des Kochfeldes 2 gemittelte Temperatur detektierbar ist. Es kann auch vorgesehen sein, dass diese Sensoren 11, 14 und der entsprechende Sensor des Sensorsystems 16 lediglich zur Erfassung der Temperatur der Unterseite 2b des Kochfeldes 2 ausgebildet sind.The provided for detecting the temperature of the hob 2 sensors 11, 14 and the sensor system 16 are preferably designed such that over the entire height h of the cooktop 2 averaged temperature is detectable. It can also be provided that these sensors 11, 14 and the corresponding sensor of the sensor system 16 are designed only for detecting the temperature of the underside 2b of the hob 2.

Das Kochfeld 2 kann beispielsweise als eine Glaskeramik-Kochfläche ausgebildet sein, welche beispielsweise materiell derart beschaffen ist, dass ein Transmissionsgrad von etwa 45 % bis 55% bei einer Wärmestrahlung mit einer Wellenlänge von etwa 1,5 µm bis etwa 2,7 µm gegeben ist. Des Weiteren kann dieses Kochfeld 2 auch einen Transmissionsgrad von etwa 37% bis etwa 40% bei einer Wellenlänge von etwa 3,5 µm bis etwa 4 µm der Wärmestrahlung aufweisen. Die IR-Sensoren 12 und 16 weisen dann bevorzugt eine für diesen Bereich entsprechende Detektionsempfindlichkeit auf. Die Angaben sind lediglich beispielhaft und können abhängig vom Material des Kochfeldes 2 variieren, weshalb dann auch die Detektionsempfindlichkeit der IR-Sensoren 12 und 16 bzw. deren Filter entsprechend zu ändern sind.The hob 2 may be formed, for example, as a glass ceramic cooking surface, which is, for example, materially such that a transmittance of about 45% to 55% in a thermal radiation having a wavelength of about 1.5 microns to about 2.7 microns is given. Furthermore, this hob 2 can also have a transmittance of about 37% to about 40% at a wavelength of about 3.5 microns to about 4 microns of heat radiation. The IR sensors 12 and 16 then preferably have a detection sensitivity corresponding to this range. The details are merely exemplary and may vary depending on the material of the hob 2, which is why then the detection sensitivity of the IR sensors 12 and 16 and their filters are to be changed accordingly.

Claims (11)

Induktionskochmulde mit einer Sensorvorrichtung mit einem ersten Sensor (11, 14, 16), welcher zur Erfassung von Messwerten zur Bestimmung einer Temperatur einer Zubereitungszone (21 bis 24), auf der ein Zubereitungsbehälter (3) zur Aufnahme eines Zubereitungsguts aufstellbar ist, ausgebildet ist, und einem IR-Sensor (12, 16), welcher zur Detektion von Wärmestrahlung der Zubereitungszone (21 bis 24) und eines Bodens (31) des Zubereitungsbehälters (3) ausgebildet ist, und einer Auswerteeinheit (13), welche mit dem ersten Sensor (11, 14, 16) und dem IR-Sensor (12, 16) elektrisch verbunden ist und mit welcher abhängig von den von den Sensoren (11, 12, 14, 16) übertragenen Informationen die Temperatur des Bodens (31) ermittelbar ist, dadurch gekennzeichnet, dass die beiden Sensoren (11, 12, 14, 16) derart angeordnet sind, dass deren örtliche Erfassungsbereiche (12a, 14a, 16a) zumindest bereichsweise überlappend, insbesondere im Wesentlichen vollständig überlappend, angeordnet sind.Induction hob with a sensor device with a first sensor (11, 14, 16), which is designed to record measured values for determining a temperature of a preparation zone (21 to 24) on which a preparation container (3) can be set up to receive a preparation material, and an IR sensor (12, 16) which is designed to detect heat radiation of the preparation zone (21 to 24) and a bottom (31) of the preparation container (3), and to an evaluation unit (13) which is connected to the first sensor (13). 11, 14, 16) and the IR sensor (12, 16) is electrically connected and with which, depending on the information transmitted by the sensors (11, 12, 14, 16), the temperature of the bottom (31) can be determined thereby characterized in that the two sensors (11, 12, 14, 16) are arranged such that their local detection areas (12a, 14a, 16a) are at least partially overlapping, in particular substantially completely overlapping, arranged. Induktionskochmulde nach Anspruch 1, dadurch gekennzeichnet, dass der Sensor (11, 14, 16) und/oder der IR-Sensor (12, 16) auf einer dem Boden (31) abgewandten Seite (2b) der Zubereitungszone (21 bis 24) angeordnet sind.Induction cooker according to claim 1, characterized in that the sensor (11, 14, 16) and / or the IR sensor (12, 16) on a bottom (31) facing away from side (2b) of the preparation zone (21 to 24) are. Induktionskochmulde nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Sensor (11) an der dem Boden (31) abgewandten Seite (2b) der Zubereitungszone (21 bis 24) befestigt ist.Induction cooker according to claim 1 or 2, characterized in that the sensor (11) on the said bottom (31) facing away from side (2b) of the preparation zone (21 to 24) is attached. Induktionskochmulde nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die beiden Sensoren (11, 12, 14, 16) von einer Induktionsvorrichtung (4) zum induktiven Heizen der Zubereitungszone (21 bis 24) abgeschirmt angeordnet ist.Induction cooker according to one of the preceding claims, characterized in that the two sensors (11, 12, 14, 16) of an induction device (4) for inductive heating of the preparation zone (21 to 24) is arranged shielded. Induktionskochmulde nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Sensor (11, 14, 16) ein NTC-Widerstand oder ein PTC-Widerstand ist.Induction cooker according to one of the preceding claims, characterized in that the sensor (11, 14, 16) is an NTC resistor or a PTC resistor. Induktionskochmulde nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Sensor ein IR-Sensor (11, 14, 16) ist.Induction cooker according to one of claims 1 to 4, characterized in that the sensor is an IR sensor (11, 14, 16). Induktionskochmulde nach Anspruch 6, dadurch gekennzeichnet, dass die beiden IR-Sensoren als Dual-Sensorsystem (16), insbesondere als 2-Kanal-Pyrometer, ausgebildet sind.Induction cooker according to claim 6, characterized in that the two IR sensors as a dual-sensor system (16), in particular as a 2-channel pyrometer, are formed. Induktionskochmulde nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Sensor (11, 14, 16) und der IR-Sensor (12, 16) benachbart zueinander angeordnet sind.Induction cooker according to one of the preceding claims, characterized in that the sensor (11, 14, 16) and the IR sensor (12, 16) are arranged adjacent to each other. Induktionskochmulde nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Sensor (11, 14, 16) und der IR-Sensor (12, 16) in einem Gehäuse (17) angeordnet sind.Induction cooker according to one of the preceding claims, characterized in that the sensor (11, 14, 16) and the IR sensor (12, 16) in a housing (17) are arranged. Induktionskochmulde nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Zubereitungsfeld (2) als Glaskeramik ausgebildet ist.Induction cooker according to one of the preceding claims, characterized in that the preparation field (2) is designed as a glass ceramic. Verfahren zum Ermitteln einer Temperatur eines Bodens (31) eines Zubereitungsbehälters (3) für ein Zubereitungsgut, wobei der Zubereitungsbehälter (3) auf einer Zubereitungszone (21 bis 24) eines Zubereitungsfeldes (2) aufgestellt wird, welche induktiv geheizt wird, und zumindest ein die Temperatur der Zubereitungszone (21 bis 24) charakterisierender Messwert mit einem Sensor (11, 14, 16) und eine Wärmestrahlung der Zubereitungszone (21 bis 24) sowie des Bodens (31) des Zubereitungsbehälters (3) mittels eines IR-Sensors (12, 16) erfasst werden, und die von den Sensoren (11, 12, 14, 16) detektierten Informationen an eine Auswerteeinheit (13) übertragen werden und mittels der Auswerteeinheit (13) abhängig von diesen Informationen die Temperatur des Bodens (31) des Zubereitungsbehälters (3) ermittelt wird, dadurch gekennzeichnet, dass die beiden Sensoren (11, 12, 14, 16) derart angeordnet sind, dass deren Erfassungsbereiche (12a, 14a, 16a) zumindest bereichsweise überlappend, insbesondere im Wesentlichen vollständig überlappend, angeordnet sind.Method for determining a temperature of a floor (31) of a preparation container (3) for a preparation item, wherein the preparation container (3) is placed on a preparation zone (21 to 24) of a preparation field (2) which is inductively heated, and at least one of the Temperature of the preparation zone (21 to 24) characterizing measured value with a sensor (11, 14, 16) and a heat radiation of the preparation zone (21 to 24) and the bottom (31) of the preparation container (3) by means of an IR sensor (12, 16 ), and the information detected by the sensors (11, 12, 14, 16) is transmitted to an evaluation unit (13) and the temperature of the bottom (31) of the preparation container (3) is dependent on this information by means of the evaluation unit (13) ) is determined, characterized in that the two sensors (11, 12, 14, 16) are arranged such that their detection areas (12a, 14a, 16a) at least partially overlapping, in special substantially completely overlapping, are arranged.
EP07108901.5A 2006-06-09 2007-05-25 Induction cooking hob and method for determining the temperature of the base of a cooking container Active EP1865754B1 (en)

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US8598497B2 (en) 2010-11-30 2013-12-03 Bose Corporation Cooking temperature and power control
WO2014033593A3 (en) * 2012-09-03 2014-05-08 BSH Bosch und Siemens Hausgeräte GmbH Domestic appliance apparatus
US8754351B2 (en) 2010-11-30 2014-06-17 Bose Corporation Induction cooking
US9470423B2 (en) 2013-12-02 2016-10-18 Bose Corporation Cooktop power control system
EP2775784B1 (en) * 2013-03-04 2017-12-20 Miele & Cie. KG Cooking system, and method for operating the same
EP2775792B1 (en) * 2013-03-04 2019-07-10 Miele & Cie. KG Cooking device
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DE102013102112A1 (en) * 2013-03-04 2014-09-18 Miele & Cie. Kg cooking facility
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DE102013102117A1 (en) * 2013-03-04 2014-09-18 Miele & Cie. Kg cooking facility
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FR2932640A1 (en) * 2008-05-27 2009-12-18 Rene Guillemin Food heating or cooking assembly, has inductor generating magnetic field to heat and cook food placed in container, and heat regulating unit regulating heat for ensuring servo heating of material of plate or container
US8598497B2 (en) 2010-11-30 2013-12-03 Bose Corporation Cooking temperature and power control
US8754351B2 (en) 2010-11-30 2014-06-17 Bose Corporation Induction cooking
US9006622B2 (en) 2010-11-30 2015-04-14 Bose Corporation Induction cooking
US9131537B2 (en) 2011-03-29 2015-09-08 Boise Corporation Cooking temperature and power control
US20150253014A1 (en) * 2012-09-03 2015-09-10 BSH Bosch und Siemens Hausgeäte GmbH Domestic appliance apparatus
WO2014033593A3 (en) * 2012-09-03 2014-05-08 BSH Bosch und Siemens Hausgeräte GmbH Domestic appliance apparatus
US9976751B2 (en) * 2012-09-03 2018-05-22 BSH Hausgeräte GmbH Domestic appliance apparatus
EP2775784B1 (en) * 2013-03-04 2017-12-20 Miele & Cie. KG Cooking system, and method for operating the same
EP2775792B1 (en) * 2013-03-04 2019-07-10 Miele & Cie. KG Cooking device
EP3515154A1 (en) * 2013-03-04 2019-07-24 Miele & Cie. KG Cooking device
EP2796791B1 (en) * 2013-04-23 2020-08-19 Whirlpool EMEA S.p.A High efficiency gas oven and method for operating thereof
US9470423B2 (en) 2013-12-02 2016-10-18 Bose Corporation Cooktop power control system

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DE102006026907A1 (en) 2008-01-03
EP1865754A3 (en) 2009-02-11
ES2570995T3 (en) 2016-05-23

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