EP2001267B1 - Procédé destiné à la commande d'un champ de cuisson et dispositif d'exécution du procédé - Google Patents

Procédé destiné à la commande d'un champ de cuisson et dispositif d'exécution du procédé Download PDF

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Publication number
EP2001267B1
EP2001267B1 EP08010143A EP08010143A EP2001267B1 EP 2001267 B1 EP2001267 B1 EP 2001267B1 EP 08010143 A EP08010143 A EP 08010143A EP 08010143 A EP08010143 A EP 08010143A EP 2001267 B1 EP2001267 B1 EP 2001267B1
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EP
European Patent Office
Prior art keywords
heating
hob
average power
heating circuit
circuit
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Application number
EP08010143A
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German (de)
English (en)
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EP2001267A3 (fr
EP2001267A2 (fr
Inventor
Jörg Vollgraf
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.)
Miele und Cie KG
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Miele und Cie KG
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Publication date
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Priority to PL08010143T priority Critical patent/PL2001267T3/pl
Publication of EP2001267A2 publication Critical patent/EP2001267A2/fr
Publication of EP2001267A3 publication Critical patent/EP2001267A3/fr
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Publication of EP2001267B1 publication Critical patent/EP2001267B1/fr
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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
    • 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
    • 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 controlling a hob and a device for carrying out the method.
  • the invention relates to a hob with at least one hob area, under which a heating element for heating a standing on the hob area cooking vessel is arranged, and a heating temperature limiting to a maximum monitoring element that limits the resulting below the cooking plate temperature to the radiant on the hob area Limit heat to a value set for safety reasons.
  • the cooking capacity of a hob by means of an underlying heating element is limited by two variables.
  • the maximum cooktop temperature must be maintained, so that, for example, the service life of a cooktop plate designed as a glass ceramic plate is guaranteed in different load cases, such as in a staggered pot, in a too small pot or in an empty cooked pot.
  • a wall that is located to the side or behind the hob must not be heated in such a way that it catches fire, even if there is no pot on the hob. This is particularly important in built-in hobs, as here inevitably hob and walls of built-in furniture are arranged closely adjacent to each other. Both are ensured by a monitoring element which cooperates with the heating element and shuts it off at a temperature of, for example, 750 ° C.
  • Temperature-dependent resistors in connection with electronics are known from the prior art which ensure compliance with the maximum permissible temperature.
  • a method for detecting and displaying an abnormal thermal load state of a ceramic glass cooktop plate in which, independently of one another in the region of a hob area, temperature sensors are arranged which determine characteristic temperature distributions in the cooktop plate for a particular anomalous thermal load state and or audible.
  • This method is intended to recognize and display the load state in a cooktop plate made of glass ceramic or a similar material. This is to ensure that depending on the use of a hob field certain causes of abnormal thermal load conditions, such as typical malpositioning of pots, as it can happen over and over again, to avoid.
  • top misalignments but also a poor pot quality can lead to overheating of the hob plate in the hob area.
  • the method known from the prior art to arrange a plurality of independent temperature sensors in the hob area, which recognize a characteristic temperature distribution in the cooktop panel for a given abnormal thermal load condition, in this way the user by optical or acoustic Warning devices indicate that there is a malposition of the cookware.
  • the invention is based on a heating element arranged below the hob area of the cooktop panel of the cooktop, above which a monitoring element designed as a bar expansion element is arranged. Due to its fixed temperature value, the bar expansion element is adjusted so that it takes into account both maximum temperature values, for the glass ceramic and the wall, under the different load cases. For example, a too small cooking vessel for the hob area, a cooking vessel not placed in the center of the hob area, or an empty cooking vessel would be other possible load cases besides the normal case.
  • the heating temperature is limited by means of a monitoring element to a maximum value, so that the resulting below the glass ceramic plate temperature is limited in order to limit the radiating on the glass ceramic surface heat to a predetermined value.
  • the monitoring element is designed here as a rod protector, wherein the rod protector extends across the entire hob area.
  • the DE 103 05 789 A1 describes a method for controlling the power supply of a heater for a glass ceramic hob.
  • the temperature of the heater is limited by a monitoring element to a maximum value.
  • a rod expansion element is preferably provided as a monitoring device which extends over the heating device. If the monitoring element detects too high a temperature below the glass ceramic pane, the heating power of the Radiant radiator reduced. Reducing the heating power leads to an undesirable extension of the cooking time.
  • the DE 41 30 337 C2 describes a method for operating a heating device with two separate surface areas, which are heated by separate heaters which are each associated directly with temperature sensors. The temperatures of the surface areas are detected, wherein the temperature ratio of the surface areas is evaluated for a power control of the surface areas. In the event of overheating of the inner heating circuit and a resulting power reduction, the proportion of the reduced power is introduced into the outer area so that the total power consumption of the cooking zone remains substantially the same. By keeping the power constant, cooking times should be greatly reduced. To achieve this goal separate temperature sensors and an elaborate control device are required in this embodiment.
  • the invention thus presents the problem of providing a method for controlling a hob, in which the heating time of the food to be cooked or the liquid to be heated is shortened.
  • the achievable with the present invention consist in particular in the shortening of the heating of the food to be cooked or the liquid to be heated.
  • the inventive method is applied to a hob with at least one hob area under which a heating element is arranged, wherein the heating element has two heating circuits, namely an inner heating circuit for heating the center and an outer heating circuit for heating the edge of the hob area.
  • the heating temperature is limited in a known per se to a maximum value, so that the heat radiating to the hob area is limited to a predetermined value.
  • the two heating circuits are switched off, as usual, when the maximum value is exceeded by the rod expansion element at the same time.
  • the heating element is turned on again in a known manner.
  • the outer heating circuit with the average power corresponding to the set cooking level and the inner heating circuit with a reduced power, which is smaller than the average power continue to operate.
  • the two heating circuits of the heating element remain switched on in the inventive method for a longer period of time than usual, so that the required heating time is reduced.
  • a development of the method according to the invention provides that the average power of the inner heating circuit is reduced by a predetermined value.
  • the teaching of the invention is realized in a particularly simple manner.
  • a particularly advantageous development provides that the average power is reduced as a function of the number of shutdowns already made. In this way, the adaptation of the reduced power for the inner heating circuit on the specific cooking or Garsituation is further improved.
  • the aforementioned adaptation according to type and scope within wide suitable limits selectable.
  • the reduction is in increments of about 10% of the average power.
  • the invention raises the further problem of specifying a hob for carrying out the method according to the invention.
  • the rod expansion element on the type, arrangement and switching value can be selected within wide suitable limits.
  • Bar expansion elements are robust and inexpensive standard components.
  • the hob control for separate activation of the two heating circuits each have a separate relay.
  • other known to those skilled in training the hob control conceivable.
  • the realization of the power reduction in the inner heating circuit is freely selectable within wide suitable limits.
  • a robust and cost-effective training is a clocked switching on and off of the inner heating circuit.
  • a particularly simple embodiment provides that the switching off of the heating element by means of the rod expansion element from the hob control by an automatic current measurement is detected.
  • FIGS. 1 and 2 show in synopsis an inventive hob with a designed as a glass ceramic hob plate 1 with at least one hob area 2, wherein below the hob area 2, a heating element 3 is arranged.
  • a heating element 3 is arranged below the hob area 2
  • the following explanations relate only to a single hob area 2 with reference to the figures, the explanations apply analogously to hobs with more than one, in particular 4 or 5, hob areas.
  • the representation according to the FIG. 1 shows a heating element 3 in a dual-circuit design.
  • the heating element 3 has an inner heating circuit 3.1 and an outer heating circuit 3.2.
  • Both heating circuits 3.1 and 3.2 are designed as electrical heating coils.
  • other types of heat sources known to the person skilled in the art such as heating lamps or gas burners, are also conceivable.
  • a plurality of outer heating circuits are used. See also Fig. 6 , which will be explained in more detail below.
  • the hob area 2 is limited in the radial direction by the inner wall of a thermal insulation 10.
  • the thermal insulation between the two heating circuits 3.1 and 3.2 is not mandatory. Embodiments are also conceivable in which there is no thermal insulation between individual heating circuits 3.1, 3.2.
  • the heating element 3 is intended to heat a standing above the hob area 2 on the glass ceramic plate 1 cooking vessel 4 in response to a previously set via a control element 5 cooking level.
  • the hob furthermore comprises a monitoring element 6 which limits the heating temperature to a maximum value and which is designed as a bar expansion element 6 arranged above the heating element 3 and below the hob plate 1.
  • the heating element 3, the control element 5 and the bar expansion element 6 are connected to a hob control 7 in the manner known in the art in signal transmission connection, which is indicated by dashed arrows 8.
  • the rod expansion element 6 is set here so that the resulting below the cooktop plate 1 temperature is limited to a maximum value of 750 ° C, so that the radiating onto the cooktop designed as a ceramic hob plate 1 heat does not exceed a temperature of about 580 ° C. This is also particularly important so that adjoining not shown adjusting panels, which are arranged at a certain distance to the hob area 2, are not affected, for example, when not installed cooking vessel 4 in affected.
  • Fig. 3 shows a block diagram of the hob control 7 in partial view. It can be seen that the two heating circuits 3.1 and 3.2 of the heating element 3 by the closing of a relay-operated main switch 9 and two separate relaisbetätigter switch 10 and 11 are turned on. In principle, however, other electrical and electronic switches known to the person skilled in the art are also possible.
  • the bar expansion element 6 would, when exceeding the previously set maximum value for the temperature below the hob plate 1, namely 750 ° C, open the circuit and thus both heating circuits 3.1 and 3.2 switch off simultaneously.
  • the heating circuits are 3.1 and 3.2 in a known manner depending on the selected cooking level and means the relays 10 and 11 clocked on and off. If a higher cooking level is selected, the heating circuits 3.1 and 3.2 remain switched on for longer, while at a lower cooking level the switch-on time for the two heating circuits 3.1 and 3.2 is shorter.
  • an ammeter 12 is further arranged. Depending on whether a current flow is detected by the ammeter 12 or not, a not-shown counter is operated in the hob control 7. In this way, the hob control unit 7 automatically detects whether and how often the bar expansion element 6 shuts off the heating circuits 3.1 and 3.2.
  • the inventive method is based on the Fig. 1 to 5 explained in more detail, wherein the Fig. 4 an exemplary course in the known from the prior art method.
  • a pot 4 of cold water On the hob is a pot 4 of cold water, which should be brought to a boil.
  • the hob is turned on through the main switch 9 and for the cooking area 2 is set by means of the control element 5, a cooking level. To bring the water to a boil as quickly as possible, the highest cooking level is set here.
  • the setting causes both heating circuits 3.1 and 3.2 of the heating element 3 with the respective rated power, namely from 1.3 kW for the inner heating circuit 3.1 and 1.7 kW for the outer heating circuit 3.2, as an average power, ie 3.0 kW in total, operated. See curve a in 4 and 5 , which respectively represents the total heating power of the heating element 3. How out Fig.
  • Fig. 5 is under otherwise the same conditions as for Fig. 4 the time course of the entire heating power of the heating element 3, ie of the heating circuit 3.1 and 3.2, curve a, and the water temperature, curve b, for the inventive method exemplified.
  • both heating circuits 3.1 and 3.2 are heating with the nominal power, ie a total of 3.0 kW.
  • the first shutdown by the bar expansion element 6 is again at about 138 s.
  • the heating circuits are 3.1 and 3.2 by the bar expansion element. 6 automatically switched on again and the outer heating circuit 3.2 is, as before, operated with the rated power of 1.7 kW.
  • the inner heating circuit 3.1 is not operated with the nominal power of 1.3 kW, but with a reduced by 10% average power of now 1.17 kW.
  • the next switching off of the heating circuits 3.1 and 3.2 by the rod expansion element 6 takes place only at about 148 s.
  • the decrease of the total heat output at about 140 s to 1.7 kW is due to the clocked switching on and off of the inner heating circuit 3.1 in order to realize the above-mentioned power reduction by 10% to 1.17 kW. If, after the first switching off of the two heating circuits 3.1 and 3.2 by the bar expansion element 6, no power reduction was made in the inner heating circuit 3.1, the total average power of the heating element 3 would continue to correspond to the nominal power, namely 3.0 kW.
  • the average power of the inner heating circuit 3.1 in the subsequent reconnection of the heating circuits 3.1 and 3.2 again reduced by 10% to then 1.04 kW.
  • the third shutdown by the rod expansion element 6 then takes place again at about 170 s.
  • the average power of the inner heating circuit 3.1 is again reduced by 10% to 0.91 kW.
  • Further disconnections by the rod expansion element 6 take place only at about 213 s and at about 388 s, whereupon in each case the average power of the inner heating circuit 3.1 is lowered by 10% to 0.78 kW and finally to 0.65 kW.
  • the average power of the outer heating circuit 3.2 remains unchanged at the rated power, namely 1.7 kW. So here it comes to a total of five times turning off the heating circuits 3.1 and 3.2 by the rod expansion element. 6
  • the inventive method leads to the known method to a significant reduction of the cooking time.
  • the cooking time is reduced from about 750 s to about 600 s, ie by 20%.
  • the inventive method makes use of the fact that the heat from the hob plate 1 at the edge of the hob area 2 is transmitted much better to the cookware 4 as in the center of the hob area 2. This is because conventional cookware 4 at the edge of the hob area 2 in intimate contact with the hob plate 1, while in the center of the hob area 2, the cookware 4 does not rest directly on the hob plate 1, but is spaced by an air gap 13 of the hob plate 1.
  • the inventive method is, as from the synopsis of 4 and 5 clearly shows, the number of tripped by the rod expansion element 6 shutdowns of the heating circuits 3.1 and 3.2 greatly reduced, so that the transferred to the cookware 4 heating power is higher than in the known method.
  • FIG. 6 another embodiment is shown, which differs from the first embodiment only in the geometry and arrangement of the heating circuits. For reasons of clarity, the representation of the other components of the hob has therefore been omitted here.
  • two outer heating circuits 3.2.1 and 3.2.2 are provided so that a more rectangular hob area 2 results.
  • the heating circuits 3.1, 3.2.1 and 3.2.2 are shown here only partially and otherwise indicated in the further course by dashed center lines.
  • the heating circuits 3.1, 3.2.1 and 3.2.2 are connected electrically in parallel with the first embodiment, so that they can be controlled independently of each other. How out Fig. 6 clearly shows, the inner heating circuit 3.1 of this embodiment is not circumferentially enclosed by the two outer heating circuits 3.2.1 and 3.2.2.
  • the average power of the inner heating circuit 3.1 after a previous power reduction and a subsequent period of time during which the heating element 3 is not turned off by the bar expansion element 6 again by a predetermined value is increased.
  • the heating element 3 switches off again, the average power of the inner heating circuit 3.1 is reduced in the manner already explained again. The above process is repeated accordingly. This has the advantage that the heating time is further shortened.
  • the percentage value of the power reduction is not kept constant at, for example, 10%. It is advantageous if the percentage value of the power reduction at the beginning of the heating phase is greater and decreases with each subsequent shutdown of the heating element 3 by the rod expansion element 6.
  • the first shutdown of the heating element 3 by the rod expansion element 6 could provide a power reduction of the inner heating circuit 3.1 by 50%. If, in a predetermined time period after switching on the heating element 3 no further shutdown by the rod expansion element 6, the average power of the inner heating circuit 3.1 is again increased, for example by 25%. After the next shutdown by the rod expansion element 6 then takes place, for example, only a power reduction by 12.5%, and so on.
  • the inventive method and the hob according to the invention for its implementation are not limited to the embodiments described above. For example, their applicability is also possible in frying operations.
  • the number of outer heating circuits is not limited to the top, but it can also be used more than two outer heating circuits.
  • the heating circuits in their geometry can be selected within wide suitable limits. It is also not necessary for the outer heating circuits to be in each case closed geometries. In general, any conceivable geometry, closed or open, is possible for both the inner and the outer or the outer heating circuits.

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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)

Claims (9)

  1. Procédé de commande d'une table de cuisson avec une plaque de table de cuisson (1) ayant au moins une zone de table de cuisson (2) sous laquelle est disposé un élément chauffant (3) pour le chauffage, en fonction d'un niveau de cuisson réglé, d'un récipient de cuisson (4) placé sur la zone de table de cuisson (2),
    dans lequel l'élément chauffant (3) présente deux circuits chauffants (3.1, 3.2), à savoir un circuit chauffant intérieur (3.1) pour le chauffage du centre et un circuit chauffant extérieur (3.2) pour le chauffage du bord de la zone de table de cuisson (2), et dans lequel un élément à dilatation de tige (6) qui limite à une valeur maximale la température de chauffage limite la température apparaissant sous la plaque de table de cuisson (1) afin de limiter à une valeur stipulée préalablement la chaleur qui rayonne sur la zone de table de cuisson (2),
    dans lequel, après l'exécution d'une coupure de l'élément chauffant (3) au moyen de l'élément de surveillance (6) et de sa remise en circuit consécutive, le circuit chauffant extérieur (3.2) continue à être opéré avec la puissance moyenne correspondant au niveau de cuisson réglé et le circuit chauffant intérieur (3.1) continue à être opéré avec une puissance réduite qui est inférieure à la puissance moyenne.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la puissance moyenne du circuit chauffant intérieur (3.1) est réduite d'une valeur stipulée préalablement.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    la puissance moyenne est réduite en fonction du nombre de coupures déjà effectuées.
  4. Procédé selon la revendication 3, dépendante de la revendication 2,
    caractérisé en ce que
    la réduction s'effectue par pas de 10 % de la puissance moyenne.
  5. Procédé selon la revendication 3,
    caractérisé en ce que
    la valeur en pourcentage de la réduction de puissance au début de la phase de chauffe est supérieure à 10 % diminue lors de chaque coupure suivante de l'élément chauffant (3) par l'élément à dilatation de tige (6).
  6. Table de cuisson pour la réalisation d'un procédé selon une des revendications 1 à 4, avec au moins une zone de table de cuisson (2) qui est limitée en direction radiale par la paroi intérieure d'une isolation (10) et sous laquelle est disposé un élément chauffant (3) pour le chauffage d'un récipient de cuisson (4) placé sur la zone de table de cuisson (2) en fonction d'un niveau de cuisson réglé par le biais d'un élément de manoeuvre (5), et avec un élément à dilatation de tige (6) qui limite à une valeur maximale la température de chauffage et qui limite la température apparaissant sous la plaque de table de cuisson (1) pour limiter à une valeur stipulée préalablement la chaleur qui rayonne sur la zone de table de cuisson (2), l'élément chauffant (3) et l'élément à dilatation de tige (6) étant en liaison de transmission de signaux avec une commande de la table de cuisson (7),
    caractérisée en ce que
    l'élément chauffant (3) présente deux circuits de chauffage (3.1, 3.2), à savoir un circuit chauffant intérieur (3.1) pour le chauffage du centre et un circuit chauffant extérieur (3.2) pour le chauffage du bord de la zone de table de cuisson (2), après l'exécution d'une coupure de l'élément chauffant (3) au moyen de l'élément à dilatation de tige (6) et de sa remise en circuit consécutive, le circuit chauffant extérieur (3.2) pouvant continuer à être opéré avec la puissance moyenne correspondant au niveau de cuisson réglé, et le circuit chauffant intérieur (3.1) pouvant continuer à être opéré avec une puissance réduite qui est inférieure à la puissance moyenne.
  7. Table de cuisson selon la revendication 6,
    caractérisée en ce que
    la commande de la table de cuisson (7) présente, pour la mise en circuit des deux circuits chauffants (3.1, 3.2) séparément l'un de l'autre, respectivement un relais séparé (10, 11).
  8. Table de cuisson selon une des revendications 5 ou 6,
    caractérisée en ce que
    la puissance moyenne du circuit chauffant intérieur (3.1) peut être réduite par une mise en et hors circuit cadencée.
  9. Table de cuisson selon au moins une des revendications 5 à 7,
    caractérisée en ce que
    la coupure de l'élément chauffant (3) au moyen de l'élément à dilatation de tige (6) peut être détectée par la commande de la table de cuisson (7) par une mesure automatique du courant (12).
EP08010143A 2007-06-06 2008-06-04 Procédé destiné à la commande d'un champ de cuisson et dispositif d'exécution du procédé Active EP2001267B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08010143T PL2001267T3 (pl) 2007-06-06 2008-06-04 Sposób sterowania płyty grzejnej i urządzenie do realizacji tego sposobu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007026704A DE102007026704A1 (de) 2007-06-06 2007-06-06 Verfahren zur Steuerung eines Kochfelds und Vorrichtung zur Durchführung des Verfahrens

Publications (3)

Publication Number Publication Date
EP2001267A2 EP2001267A2 (fr) 2008-12-10
EP2001267A3 EP2001267A3 (fr) 2011-10-19
EP2001267B1 true EP2001267B1 (fr) 2012-11-28

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Application Number Title Priority Date Filing Date
EP08010143A Active EP2001267B1 (fr) 2007-06-06 2008-06-04 Procédé destiné à la commande d'un champ de cuisson et dispositif d'exécution du procédé

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Country Link
EP (1) EP2001267B1 (fr)
DE (1) DE102007026704A1 (fr)
ES (1) ES2396261T3 (fr)
PL (1) PL2001267T3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3703768A1 (de) 1987-02-07 1988-08-18 Fissler Gmbh Vorrichtung zum erfassen der temperatur einer mittels heizwicklungen oder halogenlampen aufgeheizten glaskeramikplatte
DE4022844C1 (fr) * 1990-07-18 1992-02-27 Schott Glaswerke, 6500 Mainz, De
DE4130337C2 (de) * 1991-09-12 2002-05-02 Ego Elektro Blanc & Fischer Verfahren zum Betrieb einer elektrischen Heizeinheit und elektrische Heizeinheit
DE10305789A1 (de) * 2003-02-06 2004-09-09 E.G.O. Elektro-Gerätebau GmbH Verfahren und Vorrichtung zur Steuerung einer Heizeinrichtung

Also Published As

Publication number Publication date
EP2001267A3 (fr) 2011-10-19
ES2396261T3 (es) 2013-02-20
PL2001267T3 (pl) 2013-03-29
EP2001267A2 (fr) 2008-12-10
DE102007026704A1 (de) 2008-12-18

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