EP2420105B1 - Cooktop having a detection assembly and method for operating a cooktop - Google Patents
Cooktop having a detection assembly and method for operating a cooktop Download PDFInfo
- Publication number
- EP2420105B1 EP2420105B1 EP10711211.2A EP10711211A EP2420105B1 EP 2420105 B1 EP2420105 B1 EP 2420105B1 EP 10711211 A EP10711211 A EP 10711211A EP 2420105 B1 EP2420105 B1 EP 2420105B1
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- European Patent Office
- Prior art keywords
- heating
- heating elements
- control unit
- heat output
- cooktop
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- 238000001514 detection method Methods 0.000 title claims description 22
- 238000000034 method Methods 0.000 title claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 132
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000010411 cooking Methods 0.000 description 49
- 238000004422 calculation algorithm Methods 0.000 description 6
- 230000001419 dependent effect Effects 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000003909 pattern recognition Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 239000000411 inducer Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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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
- H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
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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
-
- 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
- H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
-
- 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
- H05B2213/05—Heating plates with pan detection means
Definitions
- the invention relates to a hob with a plurality of heating elements and a detection arrangement for detecting a position and size of at least one cookware element according to the preamble of claim 1 and a method for operating a hob according to the preamble of claim 9.
- Hobs with a plurality of heating elements are known from the prior art, which are of similar design and are arranged in particular in a grid or in a matrix.
- Generic cooking hobs comprise a detection arrangement which detects cooking utensils placed on the hob.
- a control unit of the hob evaluates the measurement results of the detection arrangement and summarizes groups of heating elements, which are arranged in the region of a detected cooking utensil element to largely freely definable heating zones together.
- the size and shape of the heating zones is thus adapted flexibly to the user-freely selected position of the cookware and the size of the cooking utensil, while in classic cooktops with fixed heating zones, the heating zone is selected depending on the size of the cookware.
- a control unit operates the heating elements combined to form a heating zone with a heating power which is determined as a function of a power level set via the user interface. If the user sets the highest power level, the heating elements of a heating zone are each operated at the maximum heating power, while at lower power levels, the heating elements are operated at a predetermined fraction of the maximum heating power.
- an induction hob is known in which the total heating power of a heating zone is predetermined by the power level selected by the user.
- the distribution of the total heating power to the individual inductors depends on the degree of coverage of the inductors by the bottom of the cooking pot to be heated. Since the sum of the degrees of coverage of the inductors of a heating zone also depends on the position of the cooking pot, this method also leads not to a completely location-independent surface heating power.
- the calculation and regulation of the heating power is very expensive, since under certain circumstances, each of the inductors must be operated with a different heating power. The different heat outputs can easily lead to problems with flicker or intermodulation hum.
- the total heating power of a heating zone is therefore dependent on the number of heating elements combined to the heating zone for the same power level selected by the user.
- the heating elements are then usually assigned to a heating zone which is adapted to a particular pot when a degree of coverage between the bottom of this pot and the relevant heating element exceeds a predetermined strictly undergraduatedeckungsgrad.
- the number of combined to form a heating zone heating elements depends on a position of the pot. For example, the same pot can cover three heating elements in a first position and, in a second position, cover four heating elements for more than the predetermined fraction.
- the invention is therefore in particular the object of providing a generic cooktop with a plurality of heating elements and a detection arrangement for detecting a position and size of at least one cookware element, the control unit can determine a total heating of a heating zone at least largely independent of a position of the cooking utensil on the hob , Furthermore, the invention relates to a method for operating a hob, according to in which the total heating power can be determined independently of the position of a cooking utensil on the hob. More particularly, the invention relates to a cooktop having a plurality of heating elements, a user interface for inputting a power level, a detection arrangement for detecting a position and size of at least one cookware element and a control unit.
- the control unit is designed to summarize a plurality of heating elements to a heating zone depending on the detected position and size of the cooking utensil element. Furthermore, the control unit determines a total heating power the heating zone depending on the input via the user interface power level and operates the heating elements accordingly with the thus determined total heating power.
- control unit is designed to calculate from measured variables of the detection arrangement a bottom surface of the cookware element and to determine the total heating power depending on the bottom surface. While known hobs at best determine the number of heating elements that are not in a reversibly unique relationship to the bottom surface of the cookware element and determine the total heating power implicitly depending on the number of heating elements, the invention seeks to avoid the above problems, the immediate dependence of To avoid total heat output from the number of heating elements.
- the bottom surface of the cookware element is determined in particular with a higher accuracy than would be possible by the mere counting of completely or partially covered by the bottom of the cookware element heating elements.
- the controller may be further configured to determine the bottom surface of the cookware element at least partially independent of a number of the heating elements of a heating zone associated with the cookware element.
- this partially independent determination of the floor area can be achieved by taking into account a correction factor, while further embodiments of the invention use methods borrowed from digital image processing and described in more detail below.
- the invention can be used in particular in induction cooking fields, in which the heating elements are inductors. Since the inductors can be used simultaneously as sensors for detecting the cookware element, additional sensors of the detection arrangement can be saved.
- the measurement is carried out by the detection arrangement in regular grid points, so that the measured variables of the detection arrangement are each assigned to a measuring point on a hob surface, wherein the measuring points form a measuring point grid.
- the control unit is designed to determine the floor area with the aid of the course of the measured variables between these measuring points.
- sensors in particular inductive sensors, in a certain way out of focus. If, for example, a maximum value of a measured variable means that the sensor is completely covered by the cookware bottom, and the measured value 0 means that there is no cookware bottom in a larger environment of the sensor, there will inevitably be a transitional area at the edge of the cookware bottom in which the measured variables Assume values between the maximum value and 0. The exact position of the edge can be determined by a suitable image processing method in this transition region with great precision.
- the edges of the cookware elements can be detected with high precision by methods borrowed from digital image processing.
- the control unit is designed to determine in such a binary image a coherent surface of pixels which are covered by a bottom surface.
- control unit is adapted to an edge image of the contiguous surface of pixels determine so as to determine the shape of the bottom surface and / or the number of cookware elements arranged in the contiguous surface.
- a situation with two closely spaced round pots can thereby be distinguished more clearly from, for example, a situation with an oval roasting pan.
- the total heating power can be determined in a simple and reproducible manner by a multiplication of the ground surface thus determined with a maximum surface heating power and with a factor dependent on the power level.
- the factor may describe a percentage of the heating power generated by the individual heating elements at the maximum heating power.
- the surface heating power is a monotonically decreasing function of the floor surface. As a result, due to the geometric situation typically worse coupling of the heating elements to the bottom of smaller Cookware elements are compensated.
- the effective coupling of the heating elements in the cookware tray is determined in smaller pots in particular by proportionally higher losses at the edge of the floor or the heating zone.
- Another aspect of the invention relates to a method of operating a cooktop.
- the method comprises the steps of detecting a position and size of at least one cookware element by a detection arrangement, combining a plurality of heating elements into a heating zone depending on the detected size and position of the cookware element, determining a total heating power of the heating zone depending on a set power level and operating the heating elements of the heating zone the total heat output.
- the method further comprises calculating a bottom surface of a cookware element from measured variables of the detection arrangement, wherein the total heating power of the heating zone is determined depending on the bottom surface.
- Fig. 1 schematically shows a cooktop with a plurality of heating elements formed as inductors 10, which are arranged in a grid.
- the first cooking pot 12 five inductors 10 largely covers, while the second cooking pot 14 has a small pot diameter and only one inductor 10 completely covered.
- the inductors 10 largely covered by the respective cooking pots 12, 14 each form a heating zone 16, 18 assigned to the corresponding cooking pot 12, 14.
- a cooktop control unit 22 receives signals from a user interface 24, which also includes a display (not shown), and operates the inductors depending on the settings made via the user interface. In particular, a user may select a power level for each of the heating zones 16, 18 via the user interface 24. There are typically 16 to 18 different power level values available to the user.
- Fig. 2 shows a cooktop with inductors 10 which are arranged in a skewed grid.
- the grid has three axes of symmetry, each at an angle of 60 ° to each other, so that three adjacent inductors 10 are each arranged in an equiangular triangle.
- cooking hob shown are three cooking pots 12, 13, 14 arranged in different positions.
- the cooking pots 12, 13, 14 have circular bottoms of identical diameter.
- Each of the cooking pots 12, 13, 14 is associated with a group of inductors 10, which form a heating zone 16, 18, 20.
- the control unit 22 of the hob then assigns an inductor 10 to a particular saucepan 12, 13, 14, when the relevant inductor 10 is covered more than half of the bottom of the relevant saucepan 12, 13, 14.
- Fig. 2 This is evident in the case of the cooking pot 12 for seven inductors, while in the case of the cooking pots 13 and 14 six or eight inductors 10 are covered to more than 50% of the corresponding cooking pot 13, 14. Since the cooking pots 12 - 14 have exactly the same diameter, shows FIG. 2 clearly that the number of inductors associated with the heating zone 16, 18, 20 of a cooking pot 12, 13, 14, not only on the size of the saucepan 12, 13, 14, but also depends on its position.
- the control unit 22 uses the inductors 10 for detecting the cooking pots 12, 13, 14, so that the inductors 10 form a detection arrangement 26 together with the control unit 22.
- the control unit 22 connects the inductors 10 with suitable capacitors to a resonant circuit and generates an oscillating current by the introduction of a voltage pulse. From a decay of this current, the control unit 22 calculates a damping constant. The greater the damping constant, the greater the degree of overlap between the respective inductor 10 and the cooking pot 12, 13, 14.
- other measuring methods may be used and / or separate sensors may be used.
- control unit 22 determines by suitable algorithm not only the number of inductors 10 combined to the respective heating zone 16, 18, 20, but also with an accuracy which greater than the achievable by the counting of the inductors 10 accuracy is the bottom surface of the cooking pots 12, 13, 14th
- the heating powers of the heating zones 16, 18, 20 are determined by the control unit 22 as a product of the bottom surface of the corresponding cooking pot 12, 13, 14, a maximum surface heating power and a factor between 0 and 1, which is dependent on the power level set via the user interface ,
- the value of this factor dependent on the power level is read by the control unit 22 from a table which is stored in a memory unit (not shown) of the control unit 22.
- the power level B stands for "booster" and describes an operating mode in which the heating elements can be operated for a short time with a heat output that exceeds their nominal power.
- a plurality of inverters or power output stages can be used in parallel with the operation of the inductors 10.
- Fig. 3 schematically shows a situation in which two cooking pots 12, 14 were placed very close to each other on the hob.
- the inductors 10 are shown as square boxes and the more than 50% of one or two of the cooking pots 12, 14 covered inductors 10 are hatched.
- Fig. 4 shows the situation Fig. 3 (or a similar situation), wherein each of the inductors 10 is assigned a percentage value, which forms a measured variable and which describes a degree of coverage of the respective inductor 10 through the bottom of one of the cooking pots 12, 14.
- the more than 50% of a cooking pot 12, 14 covered inductors 10 are shown hatched. From the hatched area alone, it is obviously difficult to tell whether the cookware element placed on the hob is a single pot (possibly a roasting pan) or two pots. Simple algorithms that have a centroid of in Fig.
- Fig. 4 determine hatched area and would calculate a radius of the heating zone depending on a total area of the hatched area, would result in an obviously inadequate result of a single round heating zone, the Fig. 4 is shown as a dashed circle. Even a simple summation of the degrees of coverage would not allow a distinction between the two cooking pots 12, 14. A heating zone described by the dashed circle would not sufficiently heat any of the saucepans 12, 14 and would not allow independent power control of the two cooking pots 12, 14 either.
- the measured variables determined by the detection arrangement 26 are applied to a pattern recognition algorithm known from image processing.
- the control unit 22, with the aid of this pattern recognition algorithm can determine an edge image of a contiguous area of pixels, whereby a per se known edge detection method can be used.
- the edge image is used to more accurately characterize the shape of the bottom surface and / or to determine the number of pots 12, 14 placed on the surface.
- the situation with two pots 12, 14 can be distinguished from a situation with an elongated pot.
- the pots 12, 14 can be separated from one another and the control unit 22 can, as in FIG Fig. 5 represented each of the cooking pots 12, 14 assign a separate heating zone 16, 18.
- the bottom surface of the saucepans 12, 14 can also be easily determined after separating the cooking pots 12, 14, for example, as the area of the in Fig. 5 illustrated circles.
- the heating zones 16, 18 defined in this way are then assigned by the control unit 22 in each case to different groups of inductors 10, which generate the heat output of the respective heating zone 16, 18. This assignment is in FIG. 5 shown. Inducers 10, which are overlapped by both heating zones 16, 18, remain inactive.
- the control unit 22 determines for each of the heating zones 16, 18 a heating power in the manner described above and operates the corresponding heating zone 16, 18 associated inductors 10 so that in the sum of a certain total heating power is generated. This total heating power is calculated by the control unit 22 for each active heating zone 16, 18 in the manner described above, depending on the bottom surface of the cooking pots 12, 14 and on the power level set for the respective heating zone 16, 18.
- the control unit 22 assigns the detected cooking pot 12, 14 one of the categories “round”, “oval”, “rectangular” and determines the parameters of the respective geometric shape in an optimization method so that the covered area is best described , In the case of round pots, the control unit determines the radius and calculates the floor area from the radius.
- the maximum surface heating power can be determined depending on the bottom surface of the cooking utensil element to be heated in a possible embodiment of the invention.
- the maximum surface heating power in a particularly advantageous embodiment of the invention is a monotonically decreasing function of the floor surface.
- Fig. 6 shows a possible choice of the dependence of the maximum surface heating power on the floor surface.
- Small waves in the course of the graph in Fig. 6 can the strength of in Fig. 2 consider the demonstrated effect.
- certain pot sizes can be better adapted to the grid of the inductors 10 than others.
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- Induction Heating Cooking Devices (AREA)
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Description
Die Erfindung betrifft ein Kochfeld mit einer Vielzahl von Heizelementen und einer Detektionsanordnung zum Detektieren einer Position und Größe wenigstens eines Kochgeschirrelements nach dem Oberbegriff des Anspruchs 1 und ein Verfahren zum Betreiben eines Kochfelds nach dem Oberbegriff des Anspruchs 9.The invention relates to a hob with a plurality of heating elements and a detection arrangement for detecting a position and size of at least one cookware element according to the preamble of
Aus dem Stand der Technik sind Kochfelder mit einer Vielzahl von Heizelementen bekannt, die gleichartig ausgebildet sind und insbesondere in einem Raster oder in einer Matrix angeordnet sind. Gattungsgemäße Kochfelder umfassen eine Detektionsanordnung, die auf das Kochfeld aufgestellte Kochgeschirrelemente detektiert. Eine Steuereinheit des Kochfelds wertet die Messergebnisse der Detektionsanordnung aus und fasst Gruppen von Heizelementen, die im Bereich eines detektierten Kochgeschirrelements angeordnet sind, zu weitgehend frei definierbaren Heizzonen zusammen. Die Größe und Form der Heizzonen wird damit flexibel an die vom Benutzer frei gewählte Position des Kochgeschirrelements und an die Größe des Kochgeschirrelements angepasst, während in klassischen Kochfeldern mit unveränderlichen Heizzonen die Heizzone abhängig von der Größe des Kochgeschirrelements gewählt wird. In solchen Matrix-Kochfeldern mit einer Vielzahl von Heizelementen und frei definierbaren Heizzonen betreibt eine Steuereinheit die zu einer Heizzone zusammengefassten Heizelemente mit einer Heizleistung, die abhängig von einer über die Benutzerschnittstelle eingestellten Leistungsstufe bestimmt wird. Wenn der Benutzer die höchste Leistungsstufe einstellt, werden die Heizelemente einer Heizzone jeweils mit der maximalen Heizleistung betrieben, während bei geringeren Leistungsstufen die Heizelemente mit einem vorgegebenen Bruchteil der maximalen Heizleistung betrieben werden.Hobs with a plurality of heating elements are known from the prior art, which are of similar design and are arranged in particular in a grid or in a matrix. Generic cooking hobs comprise a detection arrangement which detects cooking utensils placed on the hob. A control unit of the hob evaluates the measurement results of the detection arrangement and summarizes groups of heating elements, which are arranged in the region of a detected cooking utensil element to largely freely definable heating zones together. The size and shape of the heating zones is thus adapted flexibly to the user-freely selected position of the cookware and the size of the cooking utensil, while in classic cooktops with fixed heating zones, the heating zone is selected depending on the size of the cookware. In such matrix hobs with a plurality of heating elements and freely definable heating zones, a control unit operates the heating elements combined to form a heating zone with a heating power which is determined as a function of a power level set via the user interface. If the user sets the highest power level, the heating elements of a heating zone are each operated at the maximum heating power, while at lower power levels, the heating elements are operated at a predetermined fraction of the maximum heating power.
Aus der
Die Gesamtheizleistung einer Heizzone, das heißt die Summe der Heizleistungen der einzelnen Heizelemente, ist daher bei gleicher vom Benutzer gewählter Leistungsstufe abhängig von der Zahl der zu der Heizzone zusammengefassten Heizelemente. Die Heizelemente werden in der Regel dann einer Heizzone zugeordnet, die an einen bestimmten Topf angepasst ist, wenn ein Überdeckungsgrad zwischen dem Boden dieses Topfes und dem betreffenden Heizelement einen vorgegebenen Mindestüberdeckungsgrad übertrifft. Damit ist die Anzahl der zu einer Heizzone zusammengefassten Heizelemente abhängig von einer Position des Topfes. Beispielsweise kann der gleiche Topf in einer ersten Position drei Heizelemente überdecken und in einer zweiten Position vier Heizelemente zu mehr als dem vorgegebenen Bruchteil überdecken. Daraus ergibt sich für den Benutzer das unbefriedigende Ergebnis, dass der gleiche Topf bei gleicher eingestellter Leistungsstufe in unterschiedlichen Positionen auf dem Kochfeld mit unterschiedlichen Gesamtheizleistungen beheizt wird.
Aus der internationalen Patentanmeldung
Der Erfindung liegt daher insbesondere die Aufgabe zugrunde, ein gattungsgemäßes Kochfeld mit einer Vielzahl von Heizelementen und einer Detektionsanordnung zum Detektieren einer Position und Größe wenigstens eines Kochgeschirrelements bereitzustellen, dessen Steuereinheit eine Gesamtheizleistung einer Heizzone zumindest weitgehend unabhängig von einer Position des Kochgeschirrelements auf dem Kochfeld bestimmen kann. Ferner betrifft die Erfindung ein Verfahren zum Betreiben eines Kochfelds, gemäß welchem die Gesamtheizleistung unabhängig von der Position eines Kochgeschirrelements auf dem Kochfeld bestimmt werden kann.
Die Erfindung geht insbesondere aus von einem Kochfeld mit einer Vielzahl von Heizelementen, einer Benutzerschnittstelle zum Eingeben einer Leistungsstufe, einer Detektionsanordnung zum Detektieren einer Position und Größe wenigstens eines Kochgeschirrelements und einer Steuereinheit. Die Steuereinheit ist dazu ausgelegt, abhängig von der detektierten Position und Größe des Kochgeschirrelements mehrere Heizelemente zu einer Heizzone zusammenfassen. Ferner bestimmt die Steuereinheit eine Gesamtheizleistung der Heizzone abhängig von der über die Benutzerschnittstelle eingegebenen Leistungsstufe und betreibt die Heizelemente entsprechend mit der derart bestimmten Gesamtheizleistung.From the
The total heating power of a heating zone, that is the sum of the heating powers of the individual heating elements, is therefore dependent on the number of heating elements combined to the heating zone for the same power level selected by the user. The heating elements are then usually assigned to a heating zone which is adapted to a particular pot when a degree of coverage between the bottom of this pot and the relevant heating element exceeds a predetermined Mindestüberdeckungsgrad. Thus, the number of combined to form a heating zone heating elements depends on a position of the pot. For example, the same pot can cover three heating elements in a first position and, in a second position, cover four heating elements for more than the predetermined fraction. This results for the user the unsatisfactory result that the same pot is heated at the same set power level in different positions on the hob with different Gesamtheizleistungen.
From the international patent application
The invention is therefore in particular the object of providing a generic cooktop with a plurality of heating elements and a detection arrangement for detecting a position and size of at least one cookware element, the control unit can determine a total heating of a heating zone at least largely independent of a position of the cooking utensil on the hob , Furthermore, the invention relates to a method for operating a hob, according to in which the total heating power can be determined independently of the position of a cooking utensil on the hob.
More particularly, the invention relates to a cooktop having a plurality of heating elements, a user interface for inputting a power level, a detection arrangement for detecting a position and size of at least one cookware element and a control unit. The control unit is designed to summarize a plurality of heating elements to a heating zone depending on the detected position and size of the cooking utensil element. Furthermore, the control unit determines a total heating power the heating zone depending on the input via the user interface power level and operates the heating elements accordingly with the thus determined total heating power.
Es wird vorgeschlagen, dass die Steuereinheit dazu ausgelegt ist, aus Messgrößen der Detektionsanordnung eine Bodenfläche des Kochgeschirrelements zu berechnen und die Gesamtheizleistung abhängig von der Bodenfläche zu bestimmen. Während bekannte Kochfelder allenfalls die Anzahl der Heizelemente bestimmen, die nicht in einer umkehrbar eindeutigen Beziehung zu der Bodenfläche des Kochgeschirrelements steht, und die Gesamtheizleistung implizit abhängig von der Anzahl der Heizelemente bestimmen, versucht die Erfindung zur Vermeidung der oben genannten Probleme, die unmittelbare Abhängigkeit der Gesamtheizleistung von der Anzahl der Heizelemente zu vermeiden. Die Bodenfläche des Kochgeschirrelements wird insbesondere mit einer höheren Genauigkeit bestimmt, als dies durch das bloße Abzählen von ganz oder teilweise von dem Boden des Kochgeschirrelements bedeckten Heizelementen möglich wäre. Die Steuereinheit kann ferner so ausgelegt werden, dass sie die Bodenfläche des Kochgeschirrelements zumindest teilweise unabhängig von einer Anzahl der Heizelemente einer dem Kochgeschirrelement zugeordneten Heizzone bestimmen kann. Diese teilweise unabhängige Bestimmung der Bodenfläche kann in der einfachsten Ausgestaltung der Erfindung durch die Berücksichtigung eines Korrekturfaktors erfolgen, während weitere Ausgestaltungen der Erfindung Methoden verwenden, die aus der digitalen Bildverarbeitung entlehnt sind und weiter unten detaillierter beschrieben werden.It is proposed that the control unit is designed to calculate from measured variables of the detection arrangement a bottom surface of the cookware element and to determine the total heating power depending on the bottom surface. While known hobs at best determine the number of heating elements that are not in a reversibly unique relationship to the bottom surface of the cookware element and determine the total heating power implicitly depending on the number of heating elements, the invention seeks to avoid the above problems, the immediate dependence of To avoid total heat output from the number of heating elements. The bottom surface of the cookware element is determined in particular with a higher accuracy than would be possible by the mere counting of completely or partially covered by the bottom of the cookware element heating elements. The controller may be further configured to determine the bottom surface of the cookware element at least partially independent of a number of the heating elements of a heating zone associated with the cookware element. In the simplest embodiment of the invention, this partially independent determination of the floor area can be achieved by taking into account a correction factor, while further embodiments of the invention use methods borrowed from digital image processing and described in more detail below.
Die Erfindung ist insbesondere in Induktionskochfeldern einsetzbar, in denen die Heizelemente Induktoren sind. Da die Induktoren gleichzeitig als Sensoren zum Detektieren des Kochgeschirrelements verwendet werden können, können zusätzliche Sensoren der Detektionsanordnung eingespart werden.The invention can be used in particular in induction cooking fields, in which the heating elements are inductors. Since the inductors can be used simultaneously as sensors for detecting the cookware element, additional sensors of the detection arrangement can be saved.
Typischerweise erfolgt die Messung durch die Detektionsanordnung in regelmäßigen Gitterpunkten, so dass die Messgrößen der Detektionsanordnung jeweils einem Messpunkt auf einer Kochfeldoberfläche zugeordnet sind, wobei die Messpunkte ein Messpunktraster bilden. In einer besonders vorteilhaften Ausgestaltung der Erfindung ist die Steuereinheit dazu ausgelegt, die Bodenfläche mit Hilfe des Verlaufs der Messgrößen zwischen diesen Messpunkten zu bestimmen. Typischerweise sind Sensoren, insbesondere induktive Sensoren, in einer gewissen Weise unscharf. Wenn beispielsweise ein Maximalwert einer Messgröße bedeutet, dass der Sensor vollständig von dem Kochgeschirrboden überdeckt ist, und der Messwert 0 bedeutet, dass sich in einer größeren Umgebung des Sensors kein Kochgeschirrboden befindet, ergibt sich zwangsläufig ein Übergangsbereich am Rand des Kochgeschirrbodens, in welchem die Messgrößen Werte zwischen dem Maximalwert und 0 annehmen. Die genaue Position des Rands kann durch ein geeignetes Bildverarbeitungsverfahren in diesem Übergangsbereich mit großer Präzision bestimmt werden.Typically, the measurement is carried out by the detection arrangement in regular grid points, so that the measured variables of the detection arrangement are each assigned to a measuring point on a hob surface, wherein the measuring points form a measuring point grid. In a particularly advantageous embodiment of the invention, the control unit is designed to determine the floor area with the aid of the course of the measured variables between these measuring points. Typically, sensors, in particular inductive sensors, in a certain way out of focus. If, for example, a maximum value of a measured variable means that the sensor is completely covered by the cookware bottom, and the measured
Die Ränder der Kochgeschirrelemente können durch aus der digitalen Bildverarbeitung entlehnte Verfahren mit einer hohen Präzision detektiert werden.
In einer besonders vorteilhaften Ausgestaltung der Erfindung wird vorgeschlagen, dass die Steuereinheit dazu ausgelegt ist, in einem solchen binärwertigen Bild eine zusammenhängende Fläche von Bildpunkten zu bestimmen, die von einer Bodenfläche überdeckt sind.The edges of the cookware elements can be detected with high precision by methods borrowed from digital image processing.
In a particularly advantageous embodiment of the invention, it is proposed that the control unit is designed to determine in such a binary image a coherent surface of pixels which are covered by a bottom surface.
Um eine Charakterisierung der Kochgeschirrelemente beispielsweise als ovale Bräter oder runde Töpfe und/oder eine Unterscheidung zwischen zwei eng beieinander stehenden Töpfen und einem großen ovalen Bräter zu erleichtern, wird ferner vorgeschlagen, dass die Steuereinheit dazu ausgelegt ist, ein Randbild der zusammenhängenden Fläche von Bildpunkten zu bestimmen, um so die Form der Bodenfläche und/oder die Anzahl von in der zusammenhängenden Fläche angeordneten Kochgeschirrelementen zu bestimmen. Insbesondere kann dadurch eine Situation mit zwei eng beieinander stehenden runden Töpfen klarer von beispielsweise einer Situation mit einem ovalen Bräter unterschieden werden.In order to facilitate a characterization of the cookware elements, for example as oval roasters or round pots and / or a distinction between two closely spaced pots and a large oval roaster, it is further proposed that the control unit is adapted to an edge image of the contiguous surface of pixels determine so as to determine the shape of the bottom surface and / or the number of cookware elements arranged in the contiguous surface. In particular, a situation with two closely spaced round pots can thereby be distinguished more clearly from, for example, a situation with an oval roasting pan.
Die Gesamtheizleistung kann in einer einfachen und reproduzierbaren Weise durch eine Multiplikation der derart bestimmten Bodenfläche mit einer maximalen Flächenheizleistung und mit einem von der Leistungsstufe abhängigen Faktor bestimmt werden. Der Faktor kann insbesondere einen prozentualen Anteil der von den einzelnen Heizelementen erzeugten Heizleistung an der Maximalheizleistung beschreiben. In einer Weiterbildung der Erfindung wird vorgeschlagen, dass die Flächenheizleistung eine monoton fallende Funktion der Bodenfläche ist. Dadurch kann eine aufgrund der geometrischen Situation typischerweise schlechtere Ankopplung der Heizelemente an den Boden von kleineren Kochgeschirrelementen kompensiert werden. Die effektive Ankopplung der Heizelemente in den Kochgeschirrboden ist bei kleineren Töpfen insbesondere durch anteilig höhere Verluste am Rand des Bodens bzw. der Heizzone bestimmt.The total heating power can be determined in a simple and reproducible manner by a multiplication of the ground surface thus determined with a maximum surface heating power and with a factor dependent on the power level. In particular, the factor may describe a percentage of the heating power generated by the individual heating elements at the maximum heating power. In a further development of the invention it is proposed that the surface heating power is a monotonically decreasing function of the floor surface. As a result, due to the geometric situation typically worse coupling of the heating elements to the bottom of smaller Cookware elements are compensated. The effective coupling of the heating elements in the cookware tray is determined in smaller pots in particular by proportionally higher losses at the edge of the floor or the heating zone.
Ein weiterer Aspekt der Erfindung betrifft ein Verfahren zum Betreiben eines Kochfelds. Das Verfahren umfasst die Schritte Detektieren einer Position und Größe wenigstens eines Kochgeschirrelements durch eine Detektionsanordnung, Zusammenfassen mehrerer Heizelemente zu einer Heizzone abhängig von der detektierten Größe und Position des Kochgeschirrelements, Bestimmen einer Gesamtheizleistung der Heizzone abhängig von einer eingestellten Leistungsstufe und Betreiben der Heizelemente der Heizzone mit der Gesamtheizleistung.Another aspect of the invention relates to a method of operating a cooktop. The method comprises the steps of detecting a position and size of at least one cookware element by a detection arrangement, combining a plurality of heating elements into a heating zone depending on the detected size and position of the cookware element, determining a total heating power of the heating zone depending on a set power level and operating the heating elements of the heating zone the total heat output.
Es wird vorgeschlagen, dass das Verfahren ferner das Berechnen einer Bodenfläche eines Kochgeschirrelements aus Messgrößen der Detektionsanordnung umfasst, wobei die Gesamtheizleistung der Heizzone abhängig von der Bodenfläche bestimmt wird.It is proposed that the method further comprises calculating a bottom surface of a cookware element from measured variables of the detection arrangement, wherein the total heating power of the heating zone is determined depending on the bottom surface.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
Es zeigen:
- Fig. 1
- ein Kochfeld mit einer Matrix von Heizelementen und mit zwei aufgestellten Kochtöpfen,
- Fig. 2
- eine Draufsicht eines Kochfelds mit drei gleich großen Kochtöpfen in unterschiedlichen Positionen, denen jeweils eine Heizzone zugeordnet ist,
- Fig. 3
- eine schematische Darstellung eines Messpunktrasters für ein Kochfeld mit zwei eng beieinander stehenden Kochtöpfen,
- Fig. 4
- eine schematische Darstellung eines Messpunktrasters für zwei eng beieinander stehende Kochtöpfe mit jeweils angegebenen Messgrößen,
- Fig. 5
- eine schematische Darstellung zur Zuordnung von Heizelementen zu den verschiedenen Kochtöpfen in der in
Fig. 4 dargestellten Situation, und - Fig. 6
- eine schematische Darstellung zur Abhängigkeit einer Flächenheizleistung von der Bodenfläche eines Kochgeschirrelements.
- Fig. 1
- a hob with a matrix of heating elements and two cooking pots,
- Fig. 2
- a top view of a hob with three equal sized cooking pots in different positions, each associated with a heating zone,
- Fig. 3
- a schematic representation of a measuring grid for a hob with two closely spaced cooking pots,
- Fig. 4
- a schematic representation of a measuring grid for two closely spaced cooking pots, each with specified measured variables,
- Fig. 5
- a schematic representation of the assignment of heating elements to the various cooking pots in the in
Fig. 4 presented situation, and - Fig. 6
- a schematic representation of the dependence of a surface heating power of the bottom surface of a cookware element.
Eine Steuereinheit 22 des Kochfelds empfängt Signale von einer Benutzerschnittstelle 24, die auch ein Display umfasst (nicht dargestellt) und betreibt die Induktoren abhängig von den über die Benutzerschnittstelle vorgenommenen Einstellungen. Insbesondere kann ein Benutzer über die Benutzerschnittstelle 24 für jede der Heizzonen 16, 18 eine Leistungsstufe wählen. Dabei stehen dem Benutzer typischerweise 16 bis 18 verschiedene Werte für die Leistungsstufen zur Verfügung.A
Die Steuereinheit 22 des Kochfelds ordnet einen Induktor 10 dann einem bestimmten Kochtopf 12, 13, 14 zu, wenn der betreffende Induktor 10 zu mehr als der Hälfte von dem Boden des betreffenden Kochtopfes 12, 13, 14 bedeckt ist. Wie in
Die Steuereinheit 22 nutzt die Induktoren 10 zum Detektieren der Kochtöpfe 12, 13, 14, so dass die Induktoren 10 zusammen mit der Steuereinheit 22 eine Detektionsanordnung 26 bilden. Zum Detektieren der Kochtöpfe 12, 13, 14 verschaltet die Steuereinheit 22 die Induktoren 10 mit geeigneten Kondensatoren zu einem Schwingkreis und erzeugt durch das Einleiten eines Spannungspulses einen oszillierenden Strom. Aus einem Abklingen dieses Stroms berechnet die Steuereinheit 22 eine Dämpfungskonstante. Je größer die Dämpfungskonstante ist, desto stärker ist ein Überdeckungsgrad zwischen dem betreffenden Induktor 10 und dem Kochtopf 12, 13, 14. In alternativen Ausgestaltungen der Erfindung können andere Messverfahren verwendet werden und/oder separate Sensoren zum Einsatz kommen.The
Um auch in der
Die Heizleistungen der Heizzonen 16, 18, 20 werden von der Steuereinheit 22 als Produkt aus der Bodenfläche des entsprechenden Kochtopfs 12, 13, 14, einer maximalen Flächenheizleistung und einem Faktor zwischen 0 und 1 bestimmt, der abhängig von der über die Benutzerschnittstelle eingestellten Leistungsstufe ist. Der Wert dieses von der Leistungsstufe abhängigen Faktors wird von der Steuereinheit 22 aus einer Tabelle gelesen, die in einer Speichereinheit (nicht dargestellt) der Steuereinheit 22 abgelegt ist. Folgende Werte für den leistungsstufenabhängigen Faktor haben sich als vorteilhaft erwiesen:
Die Leistungsstufe B steht für "Booster" und beschreibt einen Betriebsmodus, in welchem die Heizelemente kurzzeitig mit einer Heizleistung betrieben werden können, die ihre Nominalleistung übertrifft. Dazu können mehrere Wechselrichter bzw. Leistungsendstufen parallel zum Betreiben der Induktoren 10 verwendet werden.The power level B stands for "booster" and describes an operating mode in which the heating elements can be operated for a short time with a heat output that exceeds their nominal power. For this purpose, a plurality of inverters or power output stages can be used in parallel with the operation of the
Erfindungsgemäß wird daher die von der Detektionsanordnung 26 bestimmten Messgrößen ein aus der Bildverarbeitung bekannter Mustererkennungsalgorithmus angewendet. Die Steuereinheit 22 kann mit der Hilfe dieses Mustererkennungsalgorithmus ein Randbild einer zusammenhängenden Fläche von Bildpunkten bestimmen, wobei ein an sich bekanntes Kanten-Detektionsverfahren verwendet werden kann. Das Randbild wird genutzt, um die Form der Bodenfläche genauer zu charakterisieren und/oder die Anzahl der Töpfe 12, 14, die auf der Fläche aufgestellt sind, zu bestimmen. Es kann insbesondere die Situation mit zwei Töpfen 12, 14 von einer Situation mit einem länglichen Topf unterschieden werden.According to the invention, therefore, the measured variables determined by the
Durch die Anwendung des Mustererkennungsalgorithmus oder eines anderen geeigneten Separationsalgorithmus (der beispielsweise auf dem Erkennen von Symmetrien beruhen kann), können die Töpfe 12, 14 voneinander getrennt werden und die Steuereinheit 22 kann wie in
Den so definierten Heizzonen 16, 18 werden dann von der Steuereinheit 22 jeweils unterschiedliche Gruppen von Induktoren 10 zugeordnet, die die Heizleistung der jeweiligen Heizzone 16, 18 erzeugen. Diese Zuordnung ist in
Bei dem Bestimmen der Gesamtheizleistung kann in einer möglichen Ausgestaltung der Erfindung die maximale Flächenheizleistung abhängig von der Bodenfläche des zu beheizenden Kochgeschirrelements bestimmt werden. Dabei ist die maximale Flächenheizleistung in einer besonders vorteilhaften Ausgestaltung der Erfindung eine monoton fallende Funktion der Bodenfläche.In determining the total heating power, the maximum surface heating power can be determined depending on the bottom surface of the cooking utensil element to be heated in a possible embodiment of the invention. In this case, the maximum surface heating power in a particularly advantageous embodiment of the invention is a monotonically decreasing function of the floor surface.
- 1010
- Induktoreninducers
- 1212
- Kochtopfcooking pot
- 1313
- Kochtopfcooking pot
- 1414
- Kochtopfcooking pot
- 1616
- Heizzoneheating zone
- 1818
- Heizzoneheating zone
- 2020
- Heizzoneheating zone
- 2222
- Steuereinheitcontrol unit
- 2424
- BenutzerschnittstelleUser interface
- 2626
- Detektionsanordnungdetection device
Claims (9)
- Cooktop having a plurality of heating elements (10), a user interface (24) for inputting a power level, a detection assembly (26) for detecting a position and size of at least one cookware element (12, 13, 14) and a control unit (22), which is designed so as to combine a number of heating elements (10) into a heating zone (16, 18, 20) as a function of the detected size and position of the cookware element (12, 13, 14) and to operate the heating elements (10) of the heating zone (16, 18, 20) with a total heat output, wherein the control unit (22) determines a total heat output of the heating zone (16, 18, 20) as a function of the power level input by way of the user interface (24) and operates the heating elements (10) in accordance with the total heat output determined in this way, characterised in that the control unit (22) is designed to calculate a bottom surface of the cookware element (12, 13, 14) from measurands of the detection assembly (26) and to determine the total heat output as a function of the power level and of the bottom surface.
- Cooktop according to claim 1, characterised in that the control unit (22) is designed so as to determine the bottom surface of a cookware element (12, 13, 14) at least partially independently of a number of the heating elements (10) of a heating zone (16, 18, 20), which is assigned to the cookware element (12, 13, 14).
- Cooktop according to one of the preceding claims, characterised in that the heating elements (10) are inductors and that the detection assembly (26) uses inductors so as to inductively detect the cookware element (12, 13, 14).
- Cooktop according to one of the preceding claims, characterised in that the measurands of the detection assembly (26) are each assigned to a measuring point on a cooktop surface, with the measuring points forming a measuring point grid.
- Cooktop according to claim 4, characterised in that the control unit (22) is designed so as to determine the bottom surface with an accuracy which is greater than an accuracy which can be achieved by merely counting the measuring points which are covered by the bottom surface.
- Cooktop according to one of claims 4 to 5, characterised in that each of the measuring points corresponds to the centre point of one of the heating elements (10).
- Cooktop according to one of the preceding claims, characterised in that the control unit (22) is designed so as to determine the total heat output by multiplying the bottom surface with a maximum surface heat output and with a factor which depends on the power level.
- Cooktop according to claim 7, characterised in that the surface heat output is a monotonic decreasing function of the bottom surface.
- Method for operating a cooktop, comprising the steps:- detecting a position and size of at least one cookware element (12, 13, 14) by means of a detection assembly (26),- combining a number of heating elements (10) to form a heating zone (16, 18, 20) as a function of the detected size and position of the cookware element (12, 13, 14),- determining a total heat output of the heating zone (16, 18, 20) as a function of an input power level and- operating the heating elements (10) of the heating zone (16, 18, 20) with a total heat output,characterised by the calculation of a bottom surface of the cookware element (12, 13, 14) from measurands of the detection assembly (26), with the total heat output of the heating zones (16, 18, 20) being determined as a function of the power level and of the bottom surface.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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ES200930070A ES2362782B1 (en) | 2009-04-17 | 2009-04-17 | COOKING FIELD WITH A DETECTION AND PROCEDURE PROVISION TO OPERATE A COOKING FIELD. |
PCT/EP2010/053935 WO2010118943A1 (en) | 2009-04-17 | 2010-03-25 | Cooktop having a detection assembly and method for operating a cooktop |
Publications (2)
Publication Number | Publication Date |
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EP2420105A1 EP2420105A1 (en) | 2012-02-22 |
EP2420105B1 true EP2420105B1 (en) | 2016-05-11 |
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Application Number | Title | Priority Date | Filing Date |
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EP10711211.2A Active EP2420105B1 (en) | 2009-04-17 | 2010-03-25 | Cooktop having a detection assembly and method for operating a cooktop |
Country Status (5)
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US (1) | US10009960B2 (en) |
EP (1) | EP2420105B1 (en) |
CN (1) | CN102396294A (en) |
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WO (1) | WO2010118943A1 (en) |
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DE19945297A1 (en) * | 1999-09-22 | 2001-03-29 | Diehl Ako Stiftung Gmbh & Co | Pot detection |
ITMI20031602A1 (en) * | 2003-08-04 | 2005-02-05 | Whirlpool Co | COOKING PLAN WITH RANDOM PLACING WITH USER INTERFACE |
FR2863039B1 (en) * | 2003-11-27 | 2006-02-17 | Brandt Ind | METHOD FOR HEATING A CONTAINER POSITIONED ON A COOKTOP HAVING HEATING MEANS ASSOCIATED WITH INDUCERS |
DE102004003126B4 (en) | 2004-01-14 | 2012-02-23 | E.G.O. Elektro-Gerätebau GmbH | Driving method for heating elements and device |
ES2324449B1 (en) * | 2007-07-31 | 2010-05-25 | Bsh Electrodomesticos España, S.A | COOKING FIELD WITH A PLURALITY OF HEATING AND PROCEDURE ELEMENTS FOR THE OPERATION OF A COOKING FIELD. |
ES2324450B1 (en) * | 2007-08-07 | 2010-05-25 | Bsh Electrodomesticos España, S.A. | COOKING FIELD WITH A SENSOR DEVICE AND PROCEDURE FOR THE DETECTION OF COOKING BATTERY ON A COOKING FIELD. |
-
2009
- 2009-04-17 ES ES200930070A patent/ES2362782B1/en not_active Revoked
-
2010
- 2010-03-25 ES ES10711211.2T patent/ES2572729T3/en active Active
- 2010-03-25 EP EP10711211.2A patent/EP2420105B1/en active Active
- 2010-03-25 CN CN2010800169787A patent/CN102396294A/en active Pending
- 2010-03-25 US US13/262,275 patent/US10009960B2/en active Active
- 2010-03-25 WO PCT/EP2010/053935 patent/WO2010118943A1/en active Application Filing
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017201109A1 (en) | 2017-01-24 | 2018-07-26 | E.G.O. Elektro-Gerätebau GmbH | hob |
EP3361827A1 (en) * | 2017-02-13 | 2018-08-15 | E.G.O. ELEKTRO-GERÄTEBAU GmbH | Cooking hob and method for operating a cooking hob |
DE102017202235A1 (en) | 2017-02-13 | 2018-08-16 | E.G.O. Elektro-Gerätebau GmbH | Method of operating a hob and hob |
Also Published As
Publication number | Publication date |
---|---|
ES2572729T3 (en) | 2016-06-02 |
US10009960B2 (en) | 2018-06-26 |
CN102396294A (en) | 2012-03-28 |
US20120024835A1 (en) | 2012-02-02 |
WO2010118943A1 (en) | 2010-10-21 |
ES2362782A1 (en) | 2011-07-13 |
EP2420105A1 (en) | 2012-02-22 |
ES2362782B1 (en) | 2012-05-22 |
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