EP2094059B1 - Induktionskochfeld mit wenigstens einem Induktionsheizelement und wenigstens einem Temperatursensor - Google Patents

Induktionskochfeld mit wenigstens einem Induktionsheizelement und wenigstens einem Temperatursensor Download PDF

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Publication number
EP2094059B1
EP2094059B1 EP09100133.9A EP09100133A EP2094059B1 EP 2094059 B1 EP2094059 B1 EP 2094059B1 EP 09100133 A EP09100133 A EP 09100133A EP 2094059 B1 EP2094059 B1 EP 2094059B1
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EP
European Patent Office
Prior art keywords
cooking utensil
temperature
induction
control unit
cooking
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.)
Active
Application number
EP09100133.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2094059A3 (de
EP2094059A2 (de
Inventor
Jose-Ramon Garcia Jimenez
Oscar Luis Aldana Arjol
Ruben Braulio Martinez
Sergio Llorente Gil
Fernando Monterde Aznar
David Paesa García
Carlos Sagües Blázquiz
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2094059A2 publication Critical patent/EP2094059A2/de
Publication of EP2094059A3 publication Critical patent/EP2094059A3/de
Application granted granted Critical
Publication of EP2094059B1 publication Critical patent/EP2094059B1/de
Active legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • 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
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • 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
    • 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
    • H05B2213/06—Cook-top or cookware capable of communicating with each other

Definitions

  • the invention relates to an induction hob with at least one induction heating element and at least one temperature sensor according to the preamble of claim 1 and to a method for operating such an induction hob according to the preamble of claim 15.
  • an induction hob with an induction heating element and a temperature sensor is known.
  • the induction hob also includes a control unit which uses information signals transmitted to or transmitted from the cookware element via the induction heating element via the induction heating element used as an antenna to identify the cookware element.
  • system cookers having known thermal properties from the sensor temperature detected by a temperature sensor arranged under a cover plate made of glass ceramic of the induction hob and using the parameters describing the thermal properties of the cookware element and as a controlled variable to use for adjusting the cookware temperature.
  • for frying the temperature of the cooking utensil or a content of the cooking utensil element can be controlled to a dependent of
  • the invention is in particular the object of enabling a safe determination of the cookware temperature even for cookware elements with unknown thermal properties without complex sensors.
  • the invention is based in particular on an induction hob with at least one induction heating element and with at least one temperature sensor for determining a Sensor temperature, as well as with a control unit for identifying a cooking utensil element by means of at least one electrical characteristic of the cooking utensil element.
  • the control unit uses a function depending on the sensor temperature and at least one thermal parameter specific to the cookware element to determine a cookware temperature of the cookware element.
  • control unit is designed to execute an at least partially automated calibration program for determining the thermal parameter and for assigning the thermal parameter to the electrical parameter.
  • the calibration program any cookware elements with thermal properties that are initially unknown for the induction hob can be calibrated so that they can be used like known system cookers and in particular also in a temperature-controlled mode.
  • the assignment or linkage between the thermal properties on the one hand and the electrical parameters on the other hand can be used to enable quick and easy identification by means of the electrical properties in later uses of the calibrated cooking utensil element and the thermal parameters from a storage unit of the induction hob or the control unit read.
  • electromagnetic or magnetic characteristics are to be referred to, for example, an induction coefficient of the cooking utensil element and / or an impedance of the cooking utensil element.
  • the control unit may be designed by suitable software or by special hardware for executing the calibration program.
  • thermal parameters are in particular characteristics for thermal properties of the cooking utensil element into consideration, which describe a reaction of the cooking utensil on the induction heating element in the cookware element or in the soil heat generated and / or a coupling between the cookware element and the temperature sensor.
  • control unit is designed to use at least two independent electrical characteristics of the cookware element for identifying the cooking utensil element.
  • This can be a safe and in particular unambiguous identification of the cooking utensil element can be achieved, which can be further improved by the use of three or more electrical characteristics or by detecting frequency dependencies of the electrical characteristics.
  • a detected vector of electrical characteristics can be used like a fingerprint to identify the cooking utensil.
  • control unit executes the semi-automated calibration program at least when the electrical characteristic can not be associated with a cookware element data set stored in a storage unit, unnecessary calibration of already stored cookware elements can be avoided and uncontrolled heating operation with uncalcined cookware elements can not occur.
  • thermal parameters for example, reaction times are considered which describe a delay in the heat transfer between the induction heating element and the cookware element or between the cookware element and the temperature sensor. Further, heat capacities or the like may be used as thermal parameters.
  • the controller is adapted to automatically determine in the calibration program the at least one electrical characteristic of the cookware element and to generate a sequence of predetermined heat output levels until an operator signals the attainment of a cookware temperature setpoint via a user interface
  • the calibration program may be performed without expensive sensor technology become. A sensor for immediately detecting the cookware temperature, which is automatically read by the control unit, can be avoided by the user interaction.
  • the induction hob may be equipped with a temperature sensor element for directly determining cookware temperature in the calibration program.
  • the temperature sensor element can be used, for example, as a thermochromic Element be formed that changes its color when it reaches the setpoint of the cookware temperature.
  • thermochromic stickers which can be brought into direct contact with a surface of the cooking utensil, are available inexpensively and easily applicable.
  • the control unit can determine at least one parameter of the time profile of the sensor temperature, for example an asymptotic value of the sensor temperature and / or a gradient of the sensor temperature.
  • the gradient may provide a measure of a rate of increase in sensor temperature.
  • electrical parameters are an inductance of the cooking utensil, a resistance of the cooking utensil or a composite of the inductance and the resistance power factor of the cookware element into consideration.
  • control unit is designed to operate the induction heating element in a safety mode with a low heat output when the electrical parameter can not be assigned to a data set stored for a cookware element in a storage unit.
  • a further aspect of the invention relates to a method for operating an induction hob with at least one induction heating element and at least one temperature sensor for determining a sensor temperature.
  • a cookware element is identified by means of at least one electrical parameter of the cookware element.
  • a cookware temperature of the cookware element is determined in normal operation depending on at least the sensor temperature and at least one thermal parameter specific to the cookware element.
  • the method for determining the thermal parameter and for assigning the thermal parameter to the electrical parameter comprise an at least partially automated calibration program.
  • Fig. 1 shows an induction hob with an induction heating element 10, which is arranged below a cover plate 32 of the induction cooktop.
  • the cover plate 32 is formed of glass or glass ceramic.
  • Under the cover plate 32 is in the region of the induction heating 10 shows a temperature sensor 12 for indirectly measuring a cookware temperature 20 (FIG. Fig. 4 ) arranged.
  • the temperature sensor 12 immediately measures a sensor temperature 14 (FIG. Fig. 4 ) of the actual temperature sensor 12, which may be different from the cookware temperature 20 due to the lack of direct thermal contact between the temperature sensor 12 and a set on the cover plate 32 of the induction cooktop cooking utensil 18, especially at rapidly varying cookware temperatures 20.
  • the induction heating element 10 and the temperature sensor 12 are connected to a control unit 16 of the induction hob, which operates the induction heating element 10 and can read the measured data of the temperature sensor 12.
  • the control unit 16 can store data in a storage unit 24 of the induction hob, or read data from the storage unit 24.
  • the user can actuate the induction hob via a user interface 28 operated by the control unit 16, which is shown here only schematically and can be designed, for example, as a touch screen or as a conventional arrangement of control knobs.
  • the cookware element 18 When the cookware element 18 is positioned in the region of the induction heating element 10 on the cover plate 32, the cookware element 18 influences the electrical and electromagnetic properties of the overall system composed of the induction heating element 10 and the cookware element 18.
  • an inductance of the cooking utensil element 18 influences an inductance L of the induction heating element 10 formed as an induction coil, and the power dissipated by eddy currents in the bottom of the cooking element 18 increases a loss angle of the induction heating element 10 and an apparent resistance R of the induction heating element 10, respectively.
  • An electrical auto-calibration function of the control unit 16 is used to determine a pair of electrical parameters, in particular for determining the inductance L and the resistance R of the cookware element 18 or of the overall system.
  • the control unit 16 uses the thus determined pair of electrical characteristics L, R for identifying the cookware element 18, which is placed on the cover plate 32.
  • the control unit 16 reads from memory unit 24 a thermal parameter Tpot, TGlass specific to the identified cookware element 18 and uses it these thermal parameters Tpot, TGlass as parameters of a function by means of which the control unit 16 determines an estimated value for the cookware temperature 20 from the sensor temperature 14.
  • the function is a numerical model or a simulation of the dynamic behavior of the overall system comprising the cookware element 18 and the induction heating element 10, which takes into account in particular the thermal behavior of the parts involved.
  • the numerical model depends in particular on two parameters, namely the first parameter Tpot, which describes the energy transfer between the induction coil of the induction heating element 10 and the cookware element 18 or a delay in this energy transfer, and a second parameter TGlass, which describes a heat transfer between the cookware element 18 and the temperature sensor 12 describes. If these parameters Tpot, TGlass are known, the control unit 16 can determine the cookware temperature 20 from the course of the sensor temperature and / or from a functional value of the heating power fed by the induction heating element 10.
  • Fig. 2 schematically shows the sequence of an executed by the control unit 16 operating program.
  • a first step 34 it is checked whether the automatic calibration mode is switched on. If yes, in a step 36 an electrical calibration is started, in which first in a step 38 the values of the electrical characteristics L, R are determined from an impedance of the overall system composed of the cookware element 18 and the induction heating element 10.
  • the control unit 16 checks whether the value pair of the parameters L, R within a predetermined tolerance with a corresponding value pair L i , R i of a stored in the storage unit 24 cooking utensil element coincides.
  • the cookware element 18 is identified as one of the cookware elements already stored in the storage unit 24, and the control unit 16 reads out the thermal parameter Tpot i associated with that cookware element from the storage unit 24.
  • control unit 16 also determines second cooking element thermal parameter Tglass 18, which is stronger than first thermal parameter Tpot from a position of cookware element 18 relative to induction heating element 10 and a second Bombing a bottom of the cooking utensil 18 is dependent.
  • control unit 16 automatically switches to a safety mode in which the induction heating element 10 is operated at a low heat output to avoid overheating. The same applies if the calibration fails.
  • FIGS. 3 and 4 show the time course of a heating power of the induction heater 10, or a sensor temperature 14, a resulting from the dynamic model for the thermal behavior of the cooking utensil element 18 value of the cookware temperature 20 and an actual value 46 of the cookware temperature.
  • the heating power is set in the calibration program 22 in a first phase 48 by the control unit 16 to a very high value and then, after about 2 minutes, reduced to a lower heating power level 50.
  • the high heating power in the first phase 48 results in a rapid rise in the cookware temperature 20, followed by a rise in the sensor temperature 14 with some delay.
  • the cookware temperature 20 approaches an asymptotic limit and adjusts to the sensor temperature 14.
  • this behavior differs for different cookware elements.
  • the gradient of the first, rapid rise of the cookware temperature 20 is mainly dependent on the first thermal parameter Tpot, while the asymptotic value of the cookware temperature and the sensor temperature, respectively, depends mainly on the second thermal parameter TGlass.
  • the control unit 16 simulates the course of the sensor temperature 14 for different value pairs of thermal parameters Tpot, TGlass, compares the simulation result with the actually measured curve of the sensor temperature 14 and selects that Value pair Tpot, TGlass, in which the simulation result has the smallest deviation from the actually measured time profile of the sensor temperature 14.
  • the determination of the optimal values for the thermal parameters Tpot, TGlass can take place in any multidimensional optimization method, for example also by evaluating pairs of values, which in a two-dimensional representation, in which the values of the individual parameters correspond to the respective coordinate axes, in a rectangular matrix are arranged, for example, 6 x 6 or 8 x 8 or 4 x 6 points (see. FIGS. 5 and 6 ).
  • the control unit 16 calculates for each of the models represented by a pair of values of the thermal parameters Tpot, TGlass the progression of the cookware temperature 20 and the course of the sensor temperature 14 and compares the thus calculated profile of the sensor temperature 14 with the measured value of the temperature sensor 12.
  • the calibration program 22 determines the one Model that allows the lowest sensor temperature error and thus the best temperature estimate.
  • FIG. 12 shows the cook line temperature isolines 20 that are substantially horizontal while the time-varying isolines of the sensor temperature 14 are tilted during the course of the calibration program 22 and during the cooking process, respectively, with respect to the x-axis.
  • the sensor temperature isolines are therefore determined solely by the value of the parameter TGlass.
  • the fully automated thermal calibration therefore determines the correctly discretized model depending on the time course of the measurement of the sensor temperature 14.
  • the control unit 16 determines in which of the columns of the model matrix in the representations in FIG FIGS. 5 and 6 the lowest sensor temperature error is reached.
  • control unit 16 determines the correct line depending on the timing of the sensor temperature isolines. If both the correct row and the correct column of the model matrix are known, the value of the thermal parameter Tpot can be easily determined.
  • models calculated by the control unit 16 are shown as circles with thin edge lines, the characteristics of the actual cookware 18 by a filled circle, and the model with the minimum sensor temperature error as a circle with thick edge line.
  • Fig. 7 shows an equivalent circuit diagram of the induction cooktop with the induction heating element 10 and the cookware element 18 comprehensive overall system 52, which can be represented by a series connection of a resistor R and an inductance L.
  • the induction cooktop control unit 16 measures various values of load current, voltage and power. These electrical parameters are specific to the cookware element heated by the induction heating element 10.
  • Fig. 8 shows temperature curves of a cookware temperature 20 for various cookware elements. It turns out that the smaller the parameter Tpot, which describes a thermal coupling between the cookware element and the induction heating element, the faster the cookware temperature 20 increases.
  • Fig. 9 shows the electrical characteristics of various cookware elements, each of which can be represented by a vector in a two-dimensional vector space.
  • Each of the points in Fig. 9 corresponds to a value pair L, PF from the inductance L and a power factor PF, which corresponds to the ratio of the resistance R and the amount of impedance Z.
  • Fig. 9 also shows a tolerance range 54. If the values L, R determined in step 38 are within the tolerance range 54, the cookware element is associated with the stored cookware element corresponding to the value pair described by the point in the center of the tolerance range 54. The cookware element 18 to be identified is identified as this already calibrated cookware element.
  • the calibration program 22 is partially automated and requires user intervention.
  • the induction hob is equipped with a in Fig. 1 equipped temperature sensor element 30, which is designed as a thermochromic element or as a thermochromic sticker.
  • the operator places or glues the temperature sensor element 30 onto a surface of the cookware element 18 and actuates a corresponding switch of the user interface 28 as soon as the temperature sensor element 30 changes color. This color change occurs when the cookware temperature 20 has reached a target value.
  • the control unit 16 reads the signal from the user interface 28 and determines the thermal parameter Tpot depending on the elapsed time to receive the user signal time or depending on the up to the receipt of the user signal in the cookware element 18 coupled heating power.
  • the temperature sensor element 30 can be read out contactlessly by the control unit 16, for example when the temperature sensor element 30 comprises an RFID chip.
  • the control unit 16 implements a method for operating an induction hob with an induction heating element 10 and a temperature sensor 12 for determining the sensor temperature 14.
  • a cookware element 18 is identified by means of at least one electrical characteristic L, R of the cookware element 18, and a cookware temperature 20 of the cookware element 18 is Normal operation depending on at least the sensor temperature 14 and a specific for the cookware element 18 thermal parameters Tpot, TGlass determined.
  • the thermal parameter Tpot, TGlass if this is not already known, determined and the electrical characteristics L, R associated with the cookware 18.
  • the pot When an already calibrated pot or cooking element is already set up on the induction hob, the pot can be easily detected by a quick determination of the electrical parameters L, R and the thermal parameters Tpot, TGlass can be read from the storage unit 24, so that a short heating time can be achieved.
  • the calibration scheme allows for good cooking results that are accurate to those of a system pan.
  • An inventive hob is inexpensive to implement and largely independent of the used cookware element used. Above the cover plate 32 arranged temperature sensors can be avoided.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Cookers (AREA)
EP09100133.9A 2008-02-22 2009-02-20 Induktionskochfeld mit wenigstens einem Induktionsheizelement und wenigstens einem Temperatursensor Active EP2094059B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES200800615A ES2339087B1 (es) 2008-02-22 2008-02-22 Campo de coccion por induccion con al menos un elemento de calentamiento por induccion y al menos un sensor de temperatura.

Publications (3)

Publication Number Publication Date
EP2094059A2 EP2094059A2 (de) 2009-08-26
EP2094059A3 EP2094059A3 (de) 2009-11-18
EP2094059B1 true EP2094059B1 (de) 2014-08-06

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EP (1) EP2094059B1 (es)
ES (2) ES2339087B1 (es)

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EP4231778A1 (en) * 2022-02-22 2023-08-23 LG Electronics Inc. Induction heating apparatus and method for controlling the same

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ES2589136T3 (es) 2008-12-02 2016-11-10 Whirlpool Corporation Un procedimiento para controlar el sistema de calentamiento por inducción de un aparato de cocina
DE102008054906B4 (de) * 2008-12-18 2021-09-02 BSH Hausgeräte GmbH Verfahren zum Betreiben eines Aufsatzgeräts
EP2442034B1 (en) * 2010-10-14 2012-12-05 Electrolux Home Products Corporation N.V. A cooking hob with a balance system and a method for adjusting the temperature of a cooking vessel
US8598497B2 (en) 2010-11-30 2013-12-03 Bose Corporation Cooking temperature and power control
US9006622B2 (en) 2010-11-30 2015-04-14 Bose Corporation Induction cooking
DE102012109204A1 (de) * 2012-09-28 2014-04-03 Miele & Cie. Kg Garsystem
DE102013104107A1 (de) 2013-04-23 2014-10-23 Cuciniale Gmbh Verfahren zur Regelung eines Garprozesses
DE102013218785B4 (de) * 2013-09-19 2018-07-05 E.G.O. Elektro-Gerätebau GmbH Verfahren und Vorrichtung zum Garen von Lebensmitteln
US9470423B2 (en) 2013-12-02 2016-10-18 Bose Corporation Cooktop power control system
PL3001771T3 (pl) * 2014-09-29 2017-09-29 E.G.O. Elektro-Gerätebau GmbH Sposób identyfikowania garnka na punkcie grzejnym pola grzejnego oraz system pola grzejnego z garnkiem
CN108966390B (zh) * 2017-05-18 2021-03-23 佛山市顺德区美的电热电器制造有限公司 一种防止锅具干烧的方法及装置
US10865993B2 (en) 2018-12-10 2020-12-15 Bsh Home Appliances Corporation Cooking vessel support system having a passive wireless reader/transponder for an integral cooking vessel temperature monitoring system
CN109765399B (zh) * 2019-01-18 2021-08-27 中铁工程装备集团有限公司 滚刀动态检测装置的标定设备
ES2785106A1 (es) * 2019-04-01 2020-10-05 Bsh Electrodomesticos Espana Sa Sistema de cocción
US20230122477A1 (en) 2021-10-19 2023-04-20 Whirlpool Corporation Method of determining an induction cooktop gain and related method of regulating a cooking process
US11838144B2 (en) 2022-01-13 2023-12-05 Whirlpool Corporation Assisted cooking calibration optimizer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4231778A1 (en) * 2022-02-22 2023-08-23 LG Electronics Inc. Induction heating apparatus and method for controlling the same

Also Published As

Publication number Publication date
ES2339087A1 (es) 2010-05-14
EP2094059A3 (de) 2009-11-18
ES2339087B1 (es) 2011-03-28
ES2502615T3 (es) 2014-10-03
EP2094059A2 (de) 2009-08-26

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