EP2438796A1 - Kochfeld mit einem temperatursensor - Google Patents
Kochfeld mit einem temperatursensorInfo
- Publication number
- EP2438796A1 EP2438796A1 EP10721505A EP10721505A EP2438796A1 EP 2438796 A1 EP2438796 A1 EP 2438796A1 EP 10721505 A EP10721505 A EP 10721505A EP 10721505 A EP10721505 A EP 10721505A EP 2438796 A1 EP2438796 A1 EP 2438796A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- control unit
- boiling
- heating
- hob
- 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.)
- Granted
Links
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
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating 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
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0258—For cooking
- H05B1/0269—For heating of fluids
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/07—Heating plates with temperature control means
Definitions
- the invention relates to a hob with at least one heating zone and a temperature sensor according to the preamble of claim 1 and a method for operating a hob according to the preamble of claim 8.
- DE 10 2006 057 885 A1 discloses a hob with a heating zone and a temperature sensor arranged in the center of the heating zone.
- a method is described in which a point in time at which the liquid arranged in the cookware element reaches a boiling point is predicted with the highest possible accuracy.
- the cooking content of the cookware is avoided by reducing the heating energy supply before reaching the boiling point or boiling point.
- the prediction is based on the evaluation of characteristic temperature curves recorded in the past.
- the boiling points of different liquids can vary greatly.
- precise prediction of the boiling point is important. Simmering can save a lot of energy compared to bubbly cooking because the evaporation energy released by cooking can be very high.
- the temperature of the food is too low and the difference in temperature of the food to the boiling point is too large, the cooking process is prolonged and / or leads to undesirable results.
- the invention is therefore in particular the object of enabling an energy-saving Simmer compassion with a precisely matched to the boiling temperature of the cookware contents target temperature.
- the object is achieved in particular by the features of the independent claims.
- Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.
- the invention is based on a hob with at least one heating zone, a temperature sensor for detecting the temperature of a cooking utensil element placed on the heating zone and a control unit for operating the heating zone.
- the control unit is designed to heat the cookware element in a heating phase in at least one operating mode and to regulate the temperature of the cooking utensil element in a holding phase to a desired temperature.
- control unit is designed to detect a boiling temperature of the liquid contained in the cookware element during the heating phase and to determine the setpoint temperature as a function of the boiling temperature.
- the boiling temperature should therefore be measured in the heating phase itself and not in complex experimental runs with other cookware contents.
- error-prone predictions and estimates of the boiling temperature can be dispensed with.
- the heating phase therefore lasts at least until the boiling temperature is reached. Since the direct measurement of the boiling temperature error in the prediction and estimation of the boiling temperature can be avoided, the boiling temperature is determined with high precision.
- the setpoint temperature of the heating phase which may in particular be a simmering temperature, can thus be precisely determined depending on the boiling temperature.
- the setpoint temperature can be selected smaller by a predetermined temperature difference than the boiling temperature.
- the temperature difference may in particular be between 2 ° and 7 ° C.
- the control unit can record a temperature profile of the cookware element in particular during the heating phase and detect a substantially constant portion in the temperature profile.
- the measured value for the boiling temperature can be a temperature averaged in the constant section.
- the signal of the temperature sensor can generally in a the Those skilled in the art appear to be filtered and / or averaged or subjected to appropriate scale transformation.
- control unit For detecting the constant portion of the temperature profile, the control unit can in particular form a gradient of the temperature profile.
- the temperature profile can be classified as "substantially constant” if the gradient is below a certain threshold.
- a safety shutdown can be ensured if the control unit is designed to switch off the operating mode and to generate a warning signal if the temperature detected by the temperature sensor exceeds a maximum value.
- this maximum value may be around 150 ° C. Exceeding the maximum value indicates that the cookware element is empty so that boiling can not occur.
- a further aspect of the invention relates to a method for operating a hob with at least one heating zone, a temperature sensor for detecting the temperature of a cookware element placed on the heating zone and a control unit. It is heated in at least one operating mode, the cookware element in a heating phase and the temperature of the cooking utensil element is controlled in a holding phase to a desired temperature.
- a boiling temperature of the liquid contained in the cookware element is detected during the heating phase and the SoII- temperature is determined depending on the boiling temperature.
- FIG. 1 shows a schematic representation of an induction hob with a temperature sensor and a cookware element mounted on a heating zone
- Fig. 2 shows the time courses of a heating power, a wall temperature of the cooking utensil element and a cooking temperature according to an embodiment of the invention
- FIG. 3 shows a flow chart of a method for operating a hob according to the invention.
- FIG. 1 shows a hob with a heating zone 10, a temperature sensor 12 for detecting the wall temperature of a cookware element 14 placed on the heating zone and a control unit 16.
- the heating zone 10 is an area marked on a cover plate 18 of the hob, its position and Size of the position and size of an arranged below the cover plate 18 inductor 20 corresponds.
- the cooktop is an induction cooktop and the inductor 20 receives a high-frequency heating current from an inverter 22. Between a domestic power grid connection 34 and the inverter 22, a rectifier, not shown here, is arranged.
- the control unit 16 determines the frequency and / or the amplitude of the heating current generated by the inverter 22 so that a certain heating power is generated in the time average.
- the heating current generated via the inductor 20, a high frequency alternating magnetic field, which in turn generates high-frequency eddy currents in the bottom of the cooking utensil element 14.
- the cookware element 14 is heated by the dissipation of these eddy currents.
- the temperature sensor 12 is a tower-like above the top of the cover 18 also protruding infrared temperature sensor which detects infrared radiation emitted from a side wall of the cooking utensil element 14.
- the signal detected by the sensor 12 is processed by a sensor readout unit 24 and forwarded to the control unit 16.
- the sensor readout unit 24 may, for example, perform a low-pass filtering and / or a scale transformation.
- the cover plate 18 in a tower-type temperature sensor further embodiments of the invention are conceivable in which the temperature sensor is designed as an NTC element arranged below the cover plate 18 or as an infrared sensor arranged below the cover plate.
- the control unit 16 is a universally programmable arithmetic unit that executes a software implemented method for operating the cooktop. There are different modes of operation in the method. In a particular operating mode, which could also be referred to as a simmer mode, the cookware element 14 is heated in a heating phase 26 until a liquid 28 in the cookware element 14 reaches its boiling temperature TB.
- the control unit 16 holds the cookware element 14 only at the boiling temperature TB until it has been determined with sufficient accuracy. Subsequently, the control unit 16 switches from the heating phase 26 into a holding phase 32 in which the temperature of the cookware element 14 or of the liquid 28 is regulated to a desired temperature TS. To form a closed loop feedback from the temperature sensor 12 is used.
- the relationship between the temperature of the liquid 28 and the temperature of the cooking utensil element 14 and the temperature of the radial outer wall of the cooking utensil element 14 can be determined via an empirically determined function.
- the radiation losses of the outer wall cause a proportionality between see the wall temperature of the cookware element 14 and the temperature of the liquid 28, which can be expressed by a constant factor.
- it is of secondary importance which value the boiling temperature TB of the liquid 28 itself has. What is essential is the precise determination of the outside temperature of the cooking utensil element 14, which occurs when the boiling temperature TB is reached. Because of the proportionality of the two temperatures TB, TS both can be used equivalently.
- Fig. 2 shows the time course of a heating power (solid line), the temperature of the liquid 28 (dashed line) and the temperature of the wall of the cookware element 14 (dotted line).
- the liquid 28 reaches at a time t1, the boiling temperature TB and the temperature of the liquid 28 of the cooking utensil element 14 is substantially constant in a portion 30 of the temperature profile.
- the control unit 16 averages the temperature measured in this section 30 by the temperature sensor 12 and stores this temperature as the boiling temperature TB or the wall temperature of the cookware element 14 associated with the boiling temperature.
- the control unit 16 switches to the holding phase 32. in which the liquid 28 is kept as constant as possible at a desired temperature TS. This is done in a closed loop.
- the temperature of the liquid drops briefly, but is increased again to the setpoint temperature TS. If the drop in temperature is too great, in one embodiment of the invention a re-detection of the boiling temperature may be carried out to possibly accommodate a changed composition of the liquid.
- the control unit 16 determines the target temperature by subtracting a predetermined stored value from the previously detected boiling temperature TB. This subtracted temperature difference can be, for example, 5 ° C., so that a target temperature of 95 ° C. results for pure water under standard atmospheric pressure. At 95 ° C, food is cooked in much the same way as bubbling boiling water at 100 ° C, so that evaporation energy can be saved without significantly affecting the cooking process.
- step S1 the retractable in the cover plate temperature sensor 12 is activated and moved from its retracted position upwards into an activation position.
- step S2 the heating phase 26 is started.
- step S3 the temperature of the outer wall of the cooking utensil element 14 is measured and, in a step S4, an estimated value for the temperature of the liquid 28 is determined from this temperature by multiplying it by a constant.
- step S5 the control unit 16 judges whether the liquid 28 is boiling or not. For this purpose, the control unit 16 evaluates the temperature recorded after the last measurements and checks whether this is constant except for unavoidable fluctuations. If this is the case, the boiling temperature TB is reached. If not, the process jumps to step S3 and re-measures. If a temperature is detected in step S5 which is above a maximum temperature, an emergency shutdown occurs (not shown).
- step S5 the control unit 16 calculates the setpoint temperature TS for the liquid 28 in a step S6 and moves to the holding phase 32 in a step S7.
- step S8 the temperature of the cooking utensil element 14, the temperature of the liquid 28 is calculated from the temperature of the cooking utensil element 14 in a step S9, and the heating power is regulated in a step S10 depending on the result. If the temperature of the liquid 28 is above the target temperature, the heating power of the inductor 20 is reduced by a variation of the frequency of the inverter 22. If the temperature is below the target temperature TS, the heating energy of the inductor 20 is increased. After adjusting the heating energy, the process returns to step S8.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cookers (AREA)
- Induction Heating Cooking Devices (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200930236A ES2368643B1 (es) | 2009-06-01 | 2009-06-01 | Campo de cocción con un sensor de temperatura. |
| PCT/EP2010/057323 WO2010139598A1 (de) | 2009-06-01 | 2010-05-27 | Kochfeld mit einem temperatursensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2438796A1 true EP2438796A1 (de) | 2012-04-11 |
| EP2438796B1 EP2438796B1 (de) | 2019-11-06 |
Family
ID=42370936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10721505.5A Active EP2438796B1 (de) | 2009-06-01 | 2010-05-27 | Kochfeld mit einem temperatursensor |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8530798B2 (de) |
| EP (1) | EP2438796B1 (de) |
| CN (1) | CN102450094A (de) |
| ES (1) | ES2368643B1 (de) |
| WO (1) | WO2010139598A1 (de) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2339893B1 (de) * | 2009-12-28 | 2016-05-18 | BSH Hausgeräte GmbH | Gargerätevorrichtung |
| CN102711301B (zh) * | 2011-03-28 | 2015-07-08 | 株式会社东芝 | 感应加热烹调器 |
| EP2506673B1 (de) * | 2011-03-31 | 2016-02-03 | BSH Hausgeräte GmbH | Induktionskochfeld |
| CN102357003B (zh) * | 2011-08-26 | 2013-07-10 | 陈晓明 | 泡茶水极速制备方法 |
| ES2490465B1 (es) * | 2013-03-01 | 2015-06-25 | Bsh Electrodomésticos España, S.A. | Dispositivo de campo de cocción |
| EP3216315B1 (de) * | 2014-11-07 | 2019-07-17 | Breville PTY Limited | Kochfeld |
| ES2975178T3 (es) * | 2015-12-02 | 2024-07-03 | Ego Elektro Geraetebau Gmbh | Método de funcionamiento de una encimera de cocción por inducción |
| CN109812838A (zh) * | 2018-12-30 | 2019-05-28 | 佛山市顺德区美的洗涤电器制造有限公司 | 灶具火力控制方法、装置及灶具 |
| DE102019211283A1 (de) * | 2019-07-30 | 2021-02-04 | BSH Hausgeräte GmbH | Küchenmaschine und Verfahren zur Erhöhung der Sicherheit einer Küchenmaschine |
| BE1031128B1 (de) * | 2022-12-13 | 2024-07-08 | Miele & Cie | Verfahren zum Betrieb eines induktiven Kochsystems |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4493980A (en) * | 1984-03-05 | 1985-01-15 | General Electric Company | Power control arrangement for automatic surface unit |
| DE19821439A1 (de) * | 1998-05-13 | 1999-11-18 | Bsh Bosch Siemens Hausgeraete | Sensorgesteuerte Garungseinheit mit Selbstkalibrierung |
| CN1243688A (zh) * | 1998-08-01 | 2000-02-09 | 蔡汉平 | 节能多功能自动电饭锅 |
| US6118105A (en) * | 1999-07-19 | 2000-09-12 | General Electric Company | Monitoring and control system for monitoring the boil state of contents of a cooking utensil |
| US6462316B1 (en) * | 2000-10-10 | 2002-10-08 | General Electric Company | Cooktop control and monitoring system including detecting properties of a utensil and its contents |
| US6818867B2 (en) * | 2001-06-09 | 2004-11-16 | Braun Gmbh | Method for heating liquid in an electric kettle |
| GB0322170D0 (en) | 2003-09-23 | 2003-10-22 | Ceramaspeed Ltd | Apparatus for control of boiling level |
| JP4617676B2 (ja) * | 2004-01-27 | 2011-01-26 | パナソニック株式会社 | 誘導加熱調理器 |
| GB0402412D0 (en) * | 2004-02-04 | 2004-03-10 | Ceramaspeed Ltd | Temperature sensor assembly |
| US7307246B2 (en) * | 2004-06-28 | 2007-12-11 | General Electric Company | System and method of detecting temperature of a cooking utensil over a radiant cooktop |
| CN100541359C (zh) * | 2005-07-26 | 2009-09-16 | 钟神耀 | 液体加热沸腾的模糊控制方法 |
| WO2007131271A1 (en) * | 2006-05-12 | 2007-11-22 | Sunbeam Corporation Limited | Improved temperature sensor for an electric heating vessel |
| DE102006057885A1 (de) | 2006-12-01 | 2008-06-05 | E.G.O. Elektro-Gerätebau GmbH | Verfahren zum Erzeugen, Verarbeiten und Auswerten eines mit der Temperatur korrelierten Signals und entsprechende Vorrichtung |
| US8097834B2 (en) * | 2007-06-28 | 2012-01-17 | Strix Limited | Liquid heating vessels |
| EP2326140A1 (de) * | 2009-11-18 | 2011-05-25 | Whirlpool Corporation | Verfahren zur Steuerung eines Induktionserwärmungssystems |
-
2009
- 2009-06-01 ES ES200930236A patent/ES2368643B1/es not_active Expired - Fee Related
-
2010
- 2010-05-27 US US13/375,244 patent/US8530798B2/en not_active Expired - Fee Related
- 2010-05-27 WO PCT/EP2010/057323 patent/WO2010139598A1/de not_active Ceased
- 2010-05-27 EP EP10721505.5A patent/EP2438796B1/de active Active
- 2010-05-27 CN CN2010800241120A patent/CN102450094A/zh active Pending
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010139598A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2368643A1 (es) | 2011-11-21 |
| CN102450094A (zh) | 2012-05-09 |
| US20120168425A1 (en) | 2012-07-05 |
| EP2438796B1 (de) | 2019-11-06 |
| ES2368643B1 (es) | 2012-10-10 |
| US8530798B2 (en) | 2013-09-10 |
| WO2010139598A1 (de) | 2010-12-09 |
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