EP3920662A1 - Système et procédé d'identification d'éléments de cuisine placés sur une plaque de cuisson à induction - Google Patents

Système et procédé d'identification d'éléments de cuisine placés sur une plaque de cuisson à induction Download PDF

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Publication number
EP3920662A1
EP3920662A1 EP21177817.0A EP21177817A EP3920662A1 EP 3920662 A1 EP3920662 A1 EP 3920662A1 EP 21177817 A EP21177817 A EP 21177817A EP 3920662 A1 EP3920662 A1 EP 3920662A1
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EP
European Patent Office
Prior art keywords
coil
coils
coordinates
local maxima
cookware
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21177817.0A
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German (de)
English (en)
Inventor
Andrea GALLIVANONI
Cristiano Vito Pastore
Federica Inderst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whirlpool Corp
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Whirlpool Corp
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Filing date
Publication date
Priority claimed from US16/946,098 external-priority patent/US20210385913A1/en
Priority claimed from US16/946,101 external-priority patent/US11596030B2/en
Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Publication of EP3920662A1 publication Critical patent/EP3920662A1/fr
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • 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
    • H05B2213/03—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 present disclosure generally relates to a system and method for identifying cookware items placed on an induction cooktop.
  • a method for identifying cookware items placed on top of an induction cooktop having a plurality of coils comprising the following steps: a) acquire information related to the coverage factor for each coil and collect it into a coverage factor matrix; b) identify all local maxima in the coverage factor matrix; c) find the coordinates of each of the local maxima as follows: i) when the local maxima is a single coil, the coordinates are those of a center of a single coil, and ii) when the local maxima is a region of contiguous coils, the coordinates are those of a centroid of the region; d) calculate distances from each coil to each of the coordinates of the identified local maxima; e) for each coil, determine a minimum among the distances; f) classify the coils in clusters, based on the distances from the local maxima; and g) use the identified coil clustering to estimate the position, shape, size, and orientation of the cookware items.
  • an induction cooktop system comprising: an induction cooktop including a plurality of inductive coils; a power supply for supplying power to selected ones of the plurality of inductive coils; and a controller for identifying cookware items placed on top of the induction cooktop, estimating the position, shape, size, and orientation of the cookware items, and controlling the amount of power supplied to the selected ones of the plurality of inductive coils, the controller being programmed to perform at least the following steps: a) acquire information related to the coverage factor for each coil and collect it into a coverage factor matrix; b) identify all local maxima in the coverage factor matrix; c) find the coordinates of each of the local maxima as follows: i) when the local maxima is a single coil, the coordinates are those of a center of a single coil, and ii) when the local maxima is a region of contiguous coils, the coordinates are those of a centroid of the region; d) calculate distances from each coil
  • the terms “upper,” “lower,” “right,” “left,” “rear,” “front,” “vertical,” “horizontal,” and derivatives thereof shall relate to the disclosure as oriented in FIG. 1 .
  • the term “front” shall refer to the surface of the element closer to an intended viewer, and the term “rear” shall refer to the surface of the element further from the intended viewer.
  • the disclosure may assume various alternative orientations, except where expressly specified to the contrary.
  • the specific devices and processes illustrated in the attached drawings, and described in the following specification are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.
  • the method described below aims at determining the position, size, shape, and orientation of a number of cookware items such as pots, placed over a flexible induction cooktop. This information can be later used in order to display, on a user interface, the cookware items recognized by the system, so that the user can select a desired first power level for each cookware item. Furthermore, the system can use the first power level selected by the user to derive a second power level for each coil belonging to a cluster associated with the corresponding cookware item, in order to control the power delivered to each of the said coils.
  • FIG. 1 shows an induction cooktop 10 characterized by having a large number of coils 20 1 -20 n , whose dimensions are typically smaller than the size of a cookware item, and these coils 20 1 -20 n are distributed next to each other to form mono-dimensional or bi-dimensional arrays.
  • ES2362839 / EP2242328 from Bosch Siemens essentially proposes to generate a first image whose "pixels" are representing the coverage factor in response of the overlying pots. Then it proposes to identify a cohesive (i.e. contiguous) area made of neighboring cells having a coverage factor larger than a predetermined threshold. Finally, it is proposed to apply a separation algorithm aimed at differentiating whether the contiguous area corresponds to one pot or to multiple pots close to each other.
  • the proposed method in ES2362839 / EP2242328 is known to provide inaccurate results whenever the heating cell dimension is not sufficiently small compared to the size of the pot.
  • FIG. 2A shows actual cookware items 30 and 32 placed on top of a flexible induction cooktop 10.
  • FIG. 2B shows a single elliptical pot 34 is incorrectly identified instead of two circular ones, since the cookware items 30 and 32 are too close to each other.
  • the number inside each coil displays the corresponding coverage factor.
  • the set of activated coils can be confused with the one activated by an oval pot 34.
  • the objective of the present method is to provide a method for cookware item identification and estimation able to identify individual cookware items 30 and 32 as distinct items.
  • FIG. 3 shows a block diagram of the basic electrical components of an induction cooktop system 5.
  • a controller 100 such as a microprocessor or the like, is coupled to each of the coils 20 1 -20 n of the induction cooktop 10 and to a power supply 102 and a user interface 104.
  • the controller 100 will respond to activation of an input on the user interface 104 to detect the presence, size, shape, orientation, and position of any cookware items 30 and 32 on the induction cooktop 10 using the method described below.
  • the controller 100 will control the power supply 102 to supply an appropriate power level to the coils 20 1 -20 n underlying the cookware items 30 and 32 in order to heat food in the cookware items 30 and 32.
  • the user interface 104 may be any conventional user interface and may include various inputs such as temperature settings and timers or the like.
  • a method 200 described herein is shown in FIG. 4 and may be implemented as an algorithm executed by the controller 100.
  • the method 200 has a preliminary step 202 in the acquisition of a matrix of information related to the coverage factors, each element of the matrix corresponding to one coil 20 1 -20 n .
  • the particular manner in which the controller 100 determines the coverage factor of each coil 20 1 -20 n is not described herein insofar as any known technique may be used.
  • the coverage factor matrix is then processed according to the described method to identify the different cookware items.
  • the coverage factor for each coil is defined as the degree of coverage of the coil when coupled to an overlying cookware item.
  • This coverage factor for each of the coils can be derived through a pan detection system and particularly by measuring the electromagnetic coupling between the coil and the overlying cookware.
  • to each of the inductors can be assigned a value indicative of the coverage, for instance a percentage value, starting from an electrical measurable variable linked with the electromagnetic coupling of the inductor in question, with one or more of the overlying cookware items.
  • the electrical variable that can be preferably measured is the complex impedance at the leads of the coil. It is also understood that other information related to the coverage factor can be used instead, such as, but not limited to, inductance, resistance, or power factor.
  • any other variable linked with the fraction of the area of the coil that is covered by an overlying cookware item can also be used as a coverage factor.
  • collect information related to a coverage factor thus means to collect information indicative of a degree of overlap between a cookware item and coil, and preferably to measure one or more electrical variables related to the electromagnetic coupling between the overlying cookware item and the coil; In FIG. 2 and following, this fraction is expressed as a percentage.
  • This method 200 may be referred to herein as a pseudoVoronoi method that is based on the Voronoi diagram for the partition of the plane into distinct regions: given a predetermined group of starting points called seeds, for each seed there is a region comprising all points in the plane closer to that seed than to any other.
  • the surface of the cooktop 10 is associated with a coordinate system apt to describe a 2D surface, for example, but not limited to, a Cartesian coordinate system with origin in the lower left corner of the cooktop surface, with the x axis oriented horizontally towards the right and the y axis oriented vertically towards the back.
  • a coordinate system apt to describe a 2D surface, for example, but not limited to, a Cartesian coordinate system with origin in the lower left corner of the cooktop surface, with the x axis oriented horizontally towards the right and the y axis oriented vertically towards the back.
  • the next step 204 of the algorithm is the identification of the local maxima in the coverage factor matrix, carried out by comparing the coverage factor of each coil 20 1 -20 n with that of all adjacent coils 20 1 -20 n . It is important to remember that the coverage factor is stored in the coverage factor matrix for ease of processing, and does not reflect the physical arrangement of the coils 20 1 -20 n ; therefore, adjacent coils 20 1 -20 n are not simply those neighboring in the same column or row in the coverage factor matrix, but one may take into account the so-called adjacency matrix.
  • the adjacency matrix describes, for each pair of coils 20 1 -20 n , whether they are adjacent or not, and depends only on the geometry of the induction cooktop 10 and the arrangement of the coils 20 1 -20 n , and is therefore fixed from the point of view of the algorithm.
  • the adjacency matrix describes a triangular grid, in which each coil 20 1 -20 n is, in general, adjacent to its six closest neighbors, as shown in FIG. 5 . For coils 20 1 -20 n placed near the side or on the corner, the number of adjacent neighbors is lower.
  • each coil 20 1 -20 n indicated by a large dot is adjacent to its, at most, six closest neighbors, indicated by the smaller dots and connected via line segments. Coils 20 1 -20 n on the sides or on the corners have fewer adjacent neighbors.
  • a local maximum corresponds to the coverage factor of one coil that is higher than to the coverage factors of its adjacent coils 20 1 -20 n .
  • two or more adjacent coils 20 1 -20 n all have the same coverage factor, while all remaining adjacent coils have a lower coverage factor; in actual embodiments, a predefined tolerance band around the maximum coverage factor is used in order to take into consideration coils whose coverage factor might be lower than the maximum due to tolerances, electrical noise, and the like. In this situation, it is necessary to first identify all the coils 20 1 -20 n that have the corresponding coverage factor, or whose coverage factors fall into the aforementioned tolerance band, and that form a single, contiguous region.
  • the tolerance band could be in the order of 5 %.
  • This distinction is used in the calculation of the coordinates of the local maxima.
  • the region of contiguous coils of step comprises said coils 20 1 -20 n .
  • An example of the two cases is shown in FIG. 6A : the simple case on the left, and the more complex case on the right.
  • the algorithm then calculates the coordinate of each local maximum in step 206.
  • the local maximum coordinates are simply those of the center of the corresponding coil 20 1 -20 n .
  • An example is shown in FIG. 6B , where the larger dots represent the calculated centroids for each local maximum.
  • the partition considers only the coil centers as points to be clustered.
  • the algorithm calculates, for each coil, the distance between its center and each of the local maxima identified in step 206. The minimum distance is identified in step 210, and each coil is assigned to the closest identified local maximum, thus clustering the coils into distinct groups around the local maxima in step 212. An example is shown in FIG. 6C .
  • the controller 100 identifies two different coil clusters 40 and 42, indicated by different hatching.
  • Each coil cluster 40 and 42 corresponds to one of the cookware items 30 and 32 placed on the induction cooktop 10, indicated by the thick-bordered circles.
  • Each cluster of coil clusters 40 and 42 is used to identify the cookware items 30 and 32; in particular, it is used to estimate the center position, the shape, the size, and the orientation in step 214.
  • centroid coordinates calculated here are used as the estimation for the center position of the corresponding cookware item.
  • a cluster is the area estimation for the cluster
  • N is the number of coils belonging to the cluster
  • K is an adjusting factor
  • a coil is the area of the i th coil
  • c i is the coverage factor for the ith coil.
  • Another possible way to estimate the size of each cookware item is first calculate the second moments of area and the product of inertia.
  • One possible way of performing this calculation is to consider cartesian axes, passing through the center of the cookware item, and parallel to the axes of the reference coordinate system defined in ⁇ 0036.
  • I xx is the second moment of area relative to the x-axis
  • I yy is the second moment of area relative to the y -axis
  • I xy is equivalent to the product of inertia
  • I xcoil is the second moment of area for the coils shape relative to the x-axis
  • I ycoil is the second moment of area for the coil shape relative to the y -axis
  • I xycoil is the equivalent to the product of inert
  • I I and I II are the principal moments
  • ⁇ is the rotation angle of the cookware item relative to the axes of the reference coordinate system.
  • a typical method to estimate the shape is to consider the ratio between the two semiaxes a and b just calculated: if the two values of a and b are the same, the ratio is 1 and the shape is circular; if they are different, the ratio is other than 1 and the shape is elliptical. Due to the uncertainty in the estimation and calculation of the values of the major and minor semiaxes, it is typical to compare the ratio a / b with a predefined threshold, and if the ratio is larger than this threshold consider the shape as elliptical, whereas if the ratio is smaller than this threshold the shape is considered as circular.
  • FIG. 7 shows 4 pots placed on the cooktop, in particular two of the pots are actually touching each other.
  • FIG. 8 shows the separate groups of coils used to determine the local maxima, in either the simple case where a single coil represents a local maximum of the coverage factor, and the more complex case with a contiguous region of coils having the same value, within a predefined threshold.
  • FIG. 9 shows the actual location of the local maxima, calculated from the groups of coils identified and shown in FIG. 8 .
  • FIG. 10 shows, for each coil whose coverage factor exceeds a predefined threshold, which is the closest local maxima.
  • a predefined threshold which is the closest local maxima.
  • the distance is calculated from the center of each coil to the location of the local maxima. All the coils which are shown as connected to the same local maxima will then be grouped in the same cluster.
  • FIG. 11 finally shows the coil clusters, as determined in FIG.10 , with the corresponding estimated cookware items.
  • the system can use this information to display a visual representation of the cookware items on the user interface 104.
  • the user can then select a first power level input for at least one of the identified cookware items, said first power level input being set by a user through the user interface 104, or any other means.
  • the system will then assign a second power level to each coil belonging to a cluster derived from the first power level input received from the user, said second power level being determined and set by the controller; this second power level can be set in many different ways.
  • a non-limiting example is to divide the first power level equally among all the coils belonging to the cluster, for example if the first power level is 1200 W and the cluster is composed of 6 coils, the second power level for each coil would be 200 W.
  • Another non-limiting example would be to determine the second power level proportionally to the coverage factor. Other criteria are easily determinable by people skilled in the art.
  • the system will control the power delivery to the coils belonging to the identified coil cluster corresponding to the selected cookware item, in order to deliver the first power level requested by the user to the selected cookware item.
  • clustering of coils allows to discriminate between adjacent cookware items directly, with no need to further process an area previously identified as it happens e.g. in the case of EP2242328 and EP2112865 .
  • the term "coupled” in all of its forms, couple, coupling, coupled, etc. generally means the joining of two components (electrical or mechanical) directly or indirectly to one another. Such joining may be stationary in nature or movable in nature. Such joining may be achieved with the two components (electrical or mechanical) and any additional intermediate members being integrally formed as a single unitary body with one another or with the two components. Such joining may be permanent in nature or may be removable or releasable in nature unless otherwise stated.
  • elements shown as integrally formed may be constructed of multiple parts or elements shown as multiple parts may be integrally formed, the operation of the interfaces may be reversed or otherwise varied, the length or width of the structures and/or members or connector or other elements of the system may be varied, the nature or number of adjustment positions provided between the elements may be varied.
  • the elements and/or assemblies of the system may be constructed from any of a wide variety of materials that provide sufficient strength or durability, in any of a wide variety of colors, textures, and combinations. Accordingly, all such modifications are intended to be included within the scope of the present innovations. Other substitutions, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the desired and other exemplary embodiments without departing from the spirit of the present innovations.
  • a method of identifying cookware items placed on top of an induction cooktop having a plurality of coils includes the following steps: a) collect information related to a coverage factor indicative of a degree of overlap between a cookware item and a coil for each coil and store it into a coverage factor matrix; b) identify one or more local maxima in the coverage factor matrix, wherein said local maxima correspond to the coverage factor of one or more coils that is or are higher than the coverage factors of adjacent coils; c) identify coordinates of each of the local maxima as follows, wherein said coordinates are referred to a geometric coordinate system of said induction cooktop: i.
  • the coordinates are those of a center of a single coil, and ii. when the local maxima is associated with a region of contiguous coils, the coordinates are those of a centroid of the region; d) calculate distances from each coil to each of the coordinates of the identified local maxima; e) for each coil, determine a minimum among the distances; f) group the coils in clusters, based on the distances from the local maxima; and g) use the coil clusters to estimate the position, shape, size, and orientation of the cookware items.
  • step d) includes calculating the distance from a center of each coil to the coordinates of the identified local maxima.
  • the position estimated at step g) corresponds to the coordinates of the centroid of the cluster of coils.
  • the size of a cookware item estimated at step g) is calculated based on a sum the areas of all coils belonging to a cluster, said sum being weighted by using the coverage factors of the coils belonging to said cluster.
  • step g) entails calculating with respect to the geometric coordinate system of the induction cooktop: the second moments of area and the product of inertia of each cluster; the principal moments and their angles of rotation; the major and minor semiaxes of the cookware item.
  • estimation of the shape at step g) is based on a ratio between the major and minor semiaxes of the cookware item.
  • estimation of the orientation of a cookware item is based on said angle of rotation.
  • the method further includes the following steps: h) receiving a first power level input for at least one of the identified cookware items, said first power level input being set by a user through a user interface; i) assigning a second power level to each coil belonging to a cluster derived from the first power level input received at step h), said second power level being determined and set by the controller; and j) controlling power delivery to the identified coil clusters associated with each cookware item.
  • the method further includes a step of displaying identified cookware items on a user interface.
  • the user interface is adapted to display at least one among the position, size, shape and orientation of the cookware.
  • the system further includes the step of h) supplying power to the coils underlying the cookware items.
  • step b) includes identifying all local maxima in the coverage factor matrix by comparing the coverage factor of each coil with that of all adjacent coils.
  • step b) includes identifying all local maxima in the coverage factor matrix by comparing the coverage factor of each coil with that of all adjacent coils.
  • the method further includes the step of h) supplying power to the coils underlying the cookware items.
  • step b) includes identifying all local maxima in the coverage factor matrix by comparing the coverage factor of each coil with that of all adjacent coils.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Cookers (AREA)
EP21177817.0A 2020-06-05 2021-06-04 Système et procédé d'identification d'éléments de cuisine placés sur une plaque de cuisson à induction Pending EP3920662A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16/946,098 US20210385913A1 (en) 2020-06-05 2020-06-05 System and method for identifying cookware items placed on an induction cooktop
US16/946,101 US11596030B2 (en) 2020-06-05 2020-06-05 System and method for identifying cookware items placed on an induction cooktop

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EP3920662A1 true EP3920662A1 (fr) 2021-12-08

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EP21177841.0A Active EP3920663B1 (fr) 2020-06-05 2021-06-04 Système et procédé permettant d'identifier des éléments de batterie cuisine placés sur une plaque de cuisson à induction
EP21177817.0A Pending EP3920662A1 (fr) 2020-06-05 2021-06-04 Système et procédé d'identification d'éléments de cuisine placés sur une plaque de cuisson à induction

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2112865A2 (fr) 2003-11-27 2009-10-28 Fagorbrandtsas Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs
EP2242328A2 (fr) 2009-04-17 2010-10-20 BSH Bosch und Siemens Hausgeräte GmbH Procédé de détection d'éléments de vaisselle de cuisson sur un champ de cuisson à matrice
EP2242329B1 (fr) * 2009-04-14 2015-07-29 BSH Hausgeräte GmbH Champ de cuisson et procédé destiné au fonctionnement d'un champ de cuisson

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2324450B1 (es) 2007-08-07 2010-05-25 Bsh Electrodomesticos España, S.A. Campo de coccion con un dispositivo sensor y procedimiento para la deteccion de bateria de coccion sobre un campo de coccion.
EP3307018B1 (fr) * 2016-10-10 2019-03-27 E.G.O. ELEKTRO-GERÄTEBAU GmbH Procédé de commande d'une plaque de cuisson à induction et plaque de cuisson à induction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2112865A2 (fr) 2003-11-27 2009-10-28 Fagorbrandtsas Procédé de chauffage d'un récipient posé sur une table de cuisson à moyens de chauffage associés à des inducteurs
EP2242329B1 (fr) * 2009-04-14 2015-07-29 BSH Hausgeräte GmbH Champ de cuisson et procédé destiné au fonctionnement d'un champ de cuisson
EP2242328A2 (fr) 2009-04-17 2010-10-20 BSH Bosch und Siemens Hausgeräte GmbH Procédé de détection d'éléments de vaisselle de cuisson sur un champ de cuisson à matrice

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EP3920663A1 (fr) 2021-12-08

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