EP1492385B1 - Méthode et dispositif de reconnaissance de processus de chauffage - Google Patents

Méthode et dispositif de reconnaissance de processus de chauffage Download PDF

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Publication number
EP1492385B1
EP1492385B1 EP04013591A EP04013591A EP1492385B1 EP 1492385 B1 EP1492385 B1 EP 1492385B1 EP 04013591 A EP04013591 A EP 04013591A EP 04013591 A EP04013591 A EP 04013591A EP 1492385 B1 EP1492385 B1 EP 1492385B1
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EP
European Patent Office
Prior art keywords
gradient
heating process
energy supply
temperature
during
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.)
Expired - Lifetime
Application number
EP04013591A
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German (de)
English (en)
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EP1492385A2 (fr
EP1492385A3 (fr
Inventor
Martin Baier
Wolfgang Wittenhagen
Ralf Dr. Dorwarth
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EGO Elektro Geratebau GmbH
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EGO Elektro Geratebau GmbH
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Publication of EP1492385A3 publication Critical patent/EP1492385A3/fr
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Publication of EP1492385B1 publication Critical patent/EP1492385B1/fr
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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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • 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
    • H05B2213/04—Heating plates with overheat protection 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
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a method for detecting heating processes in a hotplate or a hob according to the preamble of patent claim 1 and a device according to the preamble of patent claim 10.
  • an operating temperature limit to protect the hob.
  • rod expansion controller or electronic Temperaturbegrenzer with temperature sensors.
  • Known operating temperature limiters can also be used to detect disturbed heating processes, such as an empty heating operation, ie heating of an empty hob, and / or a dry heating process. This means that a food in a cooking vessel is completely overcooked and no food is in the cooking vessel.
  • a method and a device for detecting disturbed heating processes in a hob are known in which an evaluation of a power consumption of the heating element is performed to detect a disturbed heating process, in particular a dry heating process, during a limited-power operation.
  • a dry cooking is detected by a sharp drop in power consumption of the heating element and the associated signal.
  • a disturbed heating operation is also detected by evaluating a temperature signal. In this case, such a disturbed heating process is detected when there is a sharp increase in the temperature signal.
  • a method and a device for detecting controlled heating processes in a hob for detecting a faulty heating process, in particular an empty heating process, in which there is no pot on the hob.
  • a disturbed heating process is detected by evaluating a switching temperature-time curve, which is compared with stored switching temperature-time profiles.
  • One of the stored switching temperature-time profiles corresponds to a switching temperature-time profile of an empty cooking process.
  • a method and a device for detecting disturbed heating processes in a hob are known in which an evaluation of a power consumption of a heating element is carried out to detect a disturbed heating process, in particular a dry heating process, in a limited-power operation.
  • a dry cooking is detected by a sharp drop in power consumption of the heating element and the associated signal.
  • For evaluation of the Power consumption signal represented a first and a second derivative of the power consumption signal are determined and evaluated.
  • a faulty heating process is detected when the evaluation of the first and the second derivative indicate a sharp drop in the power consumption signal.
  • a disturbed heating operation is also detected by evaluating a temperature signal. In this case, such a disturbed heating process is detected when the first and second derivative of the temperature signal indicate a sharp rise in the temperature signal.
  • the object of the invention is to provide a method for determining heating processes and an apparatus for performing the method, which are simple in construction and with which disturbed heating operations can be reliably detected even in a power limiting mode.
  • the main idea of the invention is to evaluate a temperature profile of a cover of heaters or a temperature profile of a hotplate or a hob to determine heating operations. This is done when the power supply to at least one heating element is reduced or terminated, especially after each interval. For this purpose will be to evaluate the temperature profile, a gradient of the temperature profile, in particular in the sinking region, determined. In the evaluation, a normal heating process is detected when the gradient is greater than a predetermined threshold. If the gradient is less than or equal to a predetermined threshold value, a faulty heating process or operation is detected during the evaluation.
  • the energy supply to the at least one heating element is interrupted upon reaching a predetermined temperature of the cover and / or after predetermined time intervals. Time intervals in which energy is supplied to the heating element, and time intervals in which no energy is supplied to the heating element, alternate with each other. The time intervals may behave to each other as when clocking radiant heaters.
  • the predetermined temperature may be a maximum temperature at which the cover can be loaded and / or a temperature set by a controller in response to a user input.
  • the evaluation of the temperature profile after the switching off of the energy supply or after the end of an interval to the heating element is based on the idea that a cooking vessel arranged on the cover continues to draw energy for a cooking process even when the energy supply of the cover is switched off. This process causes a drop in the temperature of the cover, which can be evaluated. If the waste is large, it can be concluded that there is still food in the cooking vessel, as both together still take up a lot of energy. If the waste is small, then it can be concluded that little or no food is in the cooking vessel, and the cooking vessel thus takes little or no more energy.
  • a normal heating process can be distinguished from a disturbed heating process.
  • no further components are required, such as an assembly for determining the power consumption.
  • the nature of the curve of the temperature drop is approximately known. For example, it can correspond to a decaying e-function. If this theory is generally known, it can be concluded from two points on the specific curve function, and thus on a further course. From the concrete curve or the function of the course can in turn be concluded on the parameters of the decay process, such as time constants or the like. These give an indication of the nature of the decay process and thus the condition of the cover or of the cooking vessel on top of it.
  • an alarm is triggered or the power supply is reduced and / or switched off after a detected faulty heating process.
  • the currently determined gradient is compared with an earlier gradient determined at an earlier point in the evaluation of the temperature profile.
  • a first heating process is detected in which the cooking vessel with the food still very much Absorbs energy. From this it can be concluded that the food does not yet cook.
  • the cooking vessel consumes less energy with the food. It can be concluded that the food is overcooked or the cooking vessel is empty and a dry-heating process is present. This is mainly regarded as a critical condition.
  • a first point is measured shortly after the end of the energy supply interval and a second point shortly before the energy supply is restarted.
  • a significant advantage of the method according to the invention is the fact that no information or memory of absolute temperature values are necessary to distinguish the different heating processes.
  • the method only evaluates the tendency of "strong” or “weak” drops in the temperature profile during the heating breaks. These are the time intervals during which no energy is supplied to the heating system.
  • the device according to the invention for detecting heating processes in a cooking plate or cooking hob comprises a cover and a heater disposed under the cover for supplying energy to a cooking vessel, which is arranged on the cover. Furthermore, a power source for the power supply to the heater may be provided, which is controlled by a controller.
  • a temperature sensor measures a temperature profile of the cover during a heating process.
  • the controller is designed to evaluate the measured temperature profile such that it evaluates the temperature profile after termination of the energy supply. For evaluation, it determines a gradient of the temperature profile. In the evaluation, as described above, a normal heating operation is recognized when the gradient is larger than a predetermined threshold value. If the gradient is less than or equal to a predetermined threshold value, a disturbed heating process is detected during the evaluation.
  • an alarm device can be provided, which can be activated by the controller after a detected disturbed heating process.
  • the controller can decrease and / or switch off the energy supply after a detected disturbed heating process.
  • the temperature sensor can be arranged on that side of the cover on which the heater is mounted. The temperature sensor can also be attached directly to the cover or rest.
  • the inventive device for detecting heating processes comprises a glass ceramic hob 1 for a cooking plate or hob, a controller 2, a temperature sensor 3, a power source 4, a heater 7 and an operating device 5.
  • the power source 4 is controlled by the controller 2 and supplies the glass ceramic hob 1 via the heater 7 energy that is transmitted to a cooking vessel 6.
  • This energy is supplied clocked, preferably with a predetermined power and with substantially fixed cycle times, which are dependent on the level of each selected energy supply, for example as a cooking stage.
  • the temperature sensor 3 measures during a cooking process a temperature profile of the cover 1, wherein the controller 2 evaluates the measured temperature profile.
  • the temperature sensor 3 is mounted on the side of the cover 1, on which the heater 7 is arranged.
  • the controller 2 determines the evaluation after termination of the power supply, a gradient G N of the temperature profile with the above-described measures and possibilities.
  • a temperature profile of a cover of the hotplate or the hob is determined in step 100 via a temperature measurement performed by a temperature sensor 3.
  • points of the temperature profile are measured at time intervals.
  • step 200 a termination of an energy supply interval for a heating element 3 is detected, for example, because the hob has reached a predetermined temperature, or because a predetermined time interval for the energy supply has expired.
  • step 300 a decrease in the cooktop temperature as a result of the termination of the energy supply is determined as the current gradient G N.
  • the gradient G N several measured points of the temperature profile are used. Preferably, two points are used, one being measured shortly after the end of the energy supply and one shortly before the restart of the energy supply.
  • step 400 the current gradient G N is compared with a predetermined desired value. If the current gradient G N is less than or equal to the predetermined setpoint value, then a faulty heating process is detected.
  • the setpoint may also be an earlier determined gradient G N-1 .
  • the disturbed heating process corresponds in the illustrated embodiment, a dry-heating process, ie a cooking vessel 6 takes up little energy and the food in the cooking vessel 6 is almost completely overcooked. Then, in step 500, an alarm is triggered and / or the power supply is lowered and / or the power source 4 is turned off.
  • step 400 If it is determined in step 400 that the current gradient G N of the temperature profile is greater than the predetermined threshold value, then in steps 600 to 640 the type of a current normal heating process is determined by comparing the current gradient G N with that at an earlier termination Energy supply detected gradient G N-1 is compared.
  • step 600 If the comparison in step 600 reveals that the current gradient G N is greater than the previous gradient G N-1 , then a first heating process 610 is detected. When the food to be cooked in the cooking vessel 4 is not completely cooked, since the cooking vessel 4 still takes a lot of energy from the hob 1 with the food to be cooked, and the process begins again. If the current gradient G N is not greater than the previous gradient G N-1 , then step 620 is proceeded to.
  • step 620 If the comparison in step 620 reveals that the current gradient G N and the former gradient G N-1 are the same, then a second heating process is identified in which the food is cooked 630. This is because the energy consumption of the cooking vessel with the food is almost the same size over a longer period of time. The process begins again.
  • step 640 If the two gradients G N and G N-1 are not the same size, then it is determined in step 640 that the current gradient G N is smaller than the earlier gradient G N-1 . It is detected a third heating process in which the food cooked in the cooking vessel 6, since the cooking vessel 6 with the food to be cooked consumes only little energy. Then the process starts again. This step is omitted if the previous gradient G N-1 is used as the predetermined threshold value.
  • Fig. 3 a diagram is shown in which different temperature curves over time are shown.
  • the temperature of the food to be cooked is shown as a continuous curve. Dotted is the temperature of the pot bottom.
  • the dash-dotted serrated curve corresponds approximately to the temperature of the hob and the dashed jagged curve corresponds approximately to the temperature of the heater.
  • the representation is not to be taken for the absolute temperatures, but above all reflects the schematic course.
  • the horizontal dotted line is the temperature T, which reaches the food after some time. In the case of water as food, these are 100 ° C. Furthermore, with the same time intervals matching intervals, indicated by dashed lines rectangles are located. These represent the operation of a heater, such as a radiant heater. This means that in the illustrated embodiment, a heater with clocking and switching between no power and full power and regular clocking is used.
  • the temperatures of the heater no longer rise and that of the hob only just a little further on.
  • the temperature profile of the pot bottom flattens, while the temperature profile of the food remains substantially unaffected.
  • the temperature curves of the heating and the cooking hob drop markedly, while the temperature of the bottom of the pan still rises slightly, as does that of the food to be cooked.
  • the temperatures of the heating and the hob increase again rapidly and steeply.
  • the one of the bottom of the pot rises a little flatter.
  • the temperature of the food increases even more shallow.
  • the temperature of the cooking product rises substantially uniformly over the course of the entire heating process, in particular independently of the heating intervals.
  • the pot base temperature could rise again or rise above 100 ° C., in particular in the case of heating or boiling processes with water. This in turn would mean that the empty pot can absorb less heat from the heating and the hob. As a result, their temperatures also rise in absolute terms.
  • the curve sections, in which fall off the curves during a non-heated time much flatter, since just absorbed less energy can be and thus the hob temperature drops less.
  • a complete avoidance of the sinking of the hob temperature during a non-heated time is of course hardly technically and physically possible. However, the temperature difference would just be significantly lower.
  • the alarm is triggered at time t n + 1 , since the gradient of the temperature profile in the time interval T N1 between times t n + 1 and t n + 2 is smaller than at the previous time intervals after the termination of the power supply.
  • the power supply is clock-controlled.
  • the control of the time intervals for power supply and the time intervals without power supply is performed via a clock signal from the controller 2.
  • the two intervals are the same length. This could be different, depending on the selected power level.
  • the controller terminates the power supply in the illustrated embodiment, when the hob temperature reaches a predetermined temperature value. The power supply is reactivated at the next turn-on time.
  • the predetermined temperature value is, for example, a maximum possible temperature value. This may be predetermined to protect the cover from permanent damage. Or it may be a predetermined by a user via a control panel 5 temperature value.
  • the illustrated embodiment includes an unillustrated alarm device, which is activated by the controller after a detected faulty heating process. It is arranged for example in the operating device as an acoustic alarm device.
  • the power supply by the power source switches off after a detected disturbed heating process.
  • the control reduces the energy supply even before the predefined threshold value is reached, given a current gradient G N which decreases with respect to an earlier gradient G N-1 .
  • the predetermined threshold value corresponds to the previously determined gradient G N-1 , as already explained.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)
  • General Induction Heating (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Claims (12)

  1. Procédé pour détecter des cycles d'échauffement sur une plaque chauffante ou une plaque de cuisson, en particulier une plaque de cuisson en vitrocéramique, avec un élément de recouvrement (1) et une dispositif chauffant (7) en dessous pour l'alimentation en énergie d'un récipient de cuisson (6) placé sur l'élément de recouvrement (1), sachant que l'alimentation en énergie a lieu par intervalles, et que pendant un cycle d'échauffement est mesuré et analysé un profil des températures pour l'élément de recouvrement (1), caractérisé en ce que le profil des températures est saisi et analysé après la fin d'un intervalle d'alimentation en énergie, sachant que pour l'analyse est calculé un gradient (GN) du profil des températures, et qu'un cycle d'échauffement normal est détecté lors de l'analyse quand le gradient (GN) est supérieur à une valeur seuil (S) prédéfinie, et qu'un cycle d'échauffement perturbé est détecté lors de l'analyse quand le gradient (GN) est inférieur ou égal à une valeur seuil (S) prédéfinie.
  2. Procédé selon la revendication 1, caractérisé en ce que l'alimentation en énergie a lieu par intervalles de manière cadencée, de préférence avec une puissance prédéfinie et en particulier selon des temps de cycle fixes pour l'essentiel, qui dépendent de la valeur de l'alimentation en énergie respectivement sélectionnée.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'après la détection d'un cycle d'échauffement perturbé est déclenchée une alarme et/ou l'alimentation en énergie est réduite et/ou coupée.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que lors de l'analyse, le gradient momentané (GN) est comparé à une valeur seuil calculée à partir d'un gradient (GN-1) lors d'une coupure de l'alimentation en énergie antérieure, en particulier lors de la coupure de l'alimentation en énergie précédente, le gradient antérieur (GN-1) étant de préférence la valeur seuil.
  5. Procédé selon la revendication 4, caractérisé en ce que lors de l'analyse, un premier cycle d'échauffement est détecté quand le gradient momentané (GN) est supérieur au gradient antérieur (GN-1), sachant qu'en particulier un produit à bouillir dans le récipient de cuisson (6) ne bout pas encore lors de ce premier cycle d'échauffement.
  6. Procédé selon la revendication 4 ou 5, caractérisé en ce que lors de l'analyse, un deuxième cycle d'échauffement est détecté quand le gradient momentané (GN) et le gradient antérieur (GN-1) sont pratiquement égaux, sachant qu'en particulier le produit à bouillir dans le récipient de cuisson (6) bout lors de ce deuxième cycle d'échauffement détecté.
  7. Procédé selon l'une des revendications 4 à 6, caractérisé en ce que lors de l'analyse, un troisième cycle d'échauffement est détecté quand le gradient momentané (GN) est inférieur au gradient antérieur (gaz ), sachant qu'en particulier un produit à bouillir dans le récipient de cuisson (6) s'est évaporé en bouillant ou le récipient de cuisson (6) s'est vidé par ébullition lors de ce troisième cycle d'échauffement.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que la saisie de la température est assurée par un capteur sur le côté de l'élément de recouvrement (1) sur lequel est disposé le dispositif chauffant (7).
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que lors du calcul du gradient (GN) du profil des températures, plusieurs points sont mesurés selon des intervalles de temps, en particulier au moins deux points, de préférence une fois juste après la coupure de l'alimentation en énergie et une fois juste avant le rétablissement de l'alimentation en énergie ou une fois écoulé un temps fixe après la coupure de l'alimentation en énergie.
  10. Dispositif pour détecter des cycles d'échauffement sur une plaque chauffante ou une plaque de cuisson, en particulier pour réaliser le procédé selon l'une des revendications 1 à 9, avec un élément de recouvrement (1) et un dispositif chauffant (7) en dessous pour l'alimentation en énergie d'un récipient de cuisson (6) placé sur l'élément de recouvrement (1), sachant que le dispositif chauffant est commandé par une commande (2), et avec un capteur de température (3) qui mesure un profil des températures de l'élément de recouvrement (1) pendant un cycle d'échauffement, et que la commande (2) est conçue pour l'analyse du profil des températures mesuré, caractérisé en ce que la commande (2) est conçue de manière telle qu'elle analyse le profil des températures après une coupure de l'alimentation en énergie, et calcule un gradient (GN) du profil des températures pour analyse, sachant que lors de l'analyse, elle détecte un cycle d'échauffement normal quand le gradient (GN) est supérieur à une valeur seuil (S) prédéfinie, et que lors de l'analyse, elle détecte un cycle d'échauffement perturbé quand le gradient (GN) est inférieur ou égal à une valeur seuil (S) prédéfinie.
  11. Dispositif selon la revendication 10, caractérisé par un dispositif d'alarme qui peut être activé par la commande (2) après détection d'un cycle d'échauffement perturbé pour émettre un signal d'alarme et/ou pour réduire l'alimentation en énergie.
  12. Dispositif selon la revendication 10 ou 11, caractérisé en ce que le capteur de température (3) est disposé sur le côté de l'élément de recouvrement (1) sur lequel est placé le dispositif chauffant.
EP04013591A 2003-06-27 2004-06-09 Méthode et dispositif de reconnaissance de processus de chauffage Expired - Lifetime EP1492385B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10329840A DE10329840A1 (de) 2003-06-27 2003-06-27 Verfahren und Vorrichtung zur Erkennung von Erwärmungsvorgängen
DE10329840 2003-06-27

Publications (3)

Publication Number Publication Date
EP1492385A2 EP1492385A2 (fr) 2004-12-29
EP1492385A3 EP1492385A3 (fr) 2006-05-17
EP1492385B1 true EP1492385B1 (fr) 2009-07-29

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US (1) US6888110B2 (fr)
EP (1) EP1492385B1 (fr)
AT (1) ATE438281T1 (fr)
DE (2) DE10329840A1 (fr)
ES (1) ES2330631T3 (fr)

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CN104823518A (zh) * 2012-12-04 2015-08-05 伊莱克斯家用产品股份有限公司 用于控制感应烹饪炉架上的烹饪过程的方法和控制单元
US9549437B2 (en) 2012-12-04 2017-01-17 Electrolux Home Products Corporation N.V. Method and a control unit for controlling a cooking process on an induction cooking hob
CN104823518B (zh) * 2012-12-04 2017-03-08 伊莱克斯家用产品股份有限公司 用于控制感应烹饪炉架上的烹饪过程的方法和控制单元

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US6888110B2 (en) 2005-05-03
DE502004009808D1 (de) 2009-09-10
ES2330631T3 (es) 2009-12-14
EP1492385A2 (fr) 2004-12-29
EP1492385A3 (fr) 2006-05-17
DE10329840A1 (de) 2005-01-20
ATE438281T1 (de) 2009-08-15

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