EP1712844B1 - Procédé et dispositif de commande de la température d'un four de cuisson - Google Patents

Procédé et dispositif de commande de la température d'un four de cuisson Download PDF

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Publication number
EP1712844B1
EP1712844B1 EP06002097.1A EP06002097A EP1712844B1 EP 1712844 B1 EP1712844 B1 EP 1712844B1 EP 06002097 A EP06002097 A EP 06002097A EP 1712844 B1 EP1712844 B1 EP 1712844B1
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EP
European Patent Office
Prior art keywords
variable
oven
temperature
energy consumption
value
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EP06002097.1A
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German (de)
English (en)
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EP1712844A2 (fr
EP1712844A3 (fr
Inventor
Florian Ruther
Martin Andersson
Maike Müller
Christoph Walther
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Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
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Publication of EP1712844A2 publication Critical patent/EP1712844A2/fr
Publication of EP1712844A3 publication Critical patent/EP1712844A3/fr
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Publication of EP1712844B1 publication Critical patent/EP1712844B1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat

Definitions

  • the invention relates to a method for controlling the temperature of a kitchen oven according to the preamble of claim 1, and a temperature control unit of such a furnace for carrying out this method according to the preamble of claim 14 and finally a suitably equipped oven according to the preamble of claim 18th
  • An oven in use, requires a certain amount of time to reach a predetermined temperature, and this time depends inter alia. from the starting or starting temperature, the power of the heating elements, the insulation and the thermal mass or heat capacity of the furnace.
  • temperature control programs are increasingly implemented, which make the preparation of certain dishes easier and more reliable.
  • Such programs are created for a particular type of furnace and installed on the production side in ovens of this type.
  • control circuit for an oven.
  • the control circuit comprises a setpoint temperature controller.
  • An ad informs the user of the end of the preheat process.
  • the duration of the preheating process is calculated from the set temperature, the actual temperature and the temperature rise.
  • a cooking device in which the total duration of the cooking process is divided into a first and a second time period.
  • the first period of time extends until a certain temperature value is reached.
  • EP 0 029 483 A1 is a microprocessor-controlled microwave oven known.
  • the average food temperature is derived as a constant during the cooking process.
  • the average current and the average peak voltage for the magnetron are recorded and the absorbed power is a measure of the efficiency of the magnetron.
  • a furnace with two heat sources In the WO 97/00596 A1 is described a furnace with two heat sources. The one heat source is activated during a first period. The second heat source is activated until a threshold is reached.
  • From the DE 43 21 101 A1 is a household appliance with an electronic display device known.
  • the active operation of the display device can be manipulated via an additional switching device in order to reduce the power consumption of the display device.
  • a temperature control unit of a furnace is known, taking into account a static correction quantity and a dynamic correction quantity.
  • DE 100 27 299 A1 describes a method for controlling the temperature of a baking oven, in which the actual temperature of the oven before the feed between an upper and lower threshold is controlled oscillating.
  • a method of controlling the temperature of a furnace is known. First, the sample and furnace temperatures and their dependencies are determined. The temperature control is based on the oven temperature and without measuring the sample temperature.
  • the object of the invention is therefore to provide an improved in its accuracy and reliability for the individual user method of the generic type and a corresponding temperature control unit and finally a hereby equipped furnace.
  • the invention includes, on the one hand, the essential idea of specifying, for a furnace type, a generally predetermined basic control program by considering a correction quantity reflecting relevant parameters of the individual furnace. Specifically, this is a substantially static correction quantity, which sufficiently emphasizes the structural character of the individual furnace in its control program.
  • the invention further includes the idea of using a sum correction variable, which allows a simple consideration of the furnace characteristics, without having to be individually and costly recorded, entered and processed by the program.
  • the invention includes the idea of taking into account a dynamic correction variable or correction formula in the control program, which allows the consideration of the current values of variable operating parameters of the furnace. These are operating parameters that are not based on the structural design of the furnace and can be detected relatively easily "on site” metrologically.
  • the static correction variable is determined during a heating process at the empty furnace by comparing a measured actual value, in particular heating time actual value, with a reference value corresponding to the basic control program, in particular heating time reference value.
  • the dynamic correction quantity is determined on the basis of a correction formula (compensation formula) immediately before or during the heating from a measured value of at least one operating parameter.
  • a heating time difference or a heating curve increase factor is used as a static correction variable and dynamic correction variable, which is a deviation of the increase of a corrected heating curve from that of a reference curve Multiplication factor reflects.
  • the dynamic correction quantity is formed taking into account at least one of the operating parameters mains voltage, output temperature and energy consumption or power consumption.
  • the heating time difference by taking into account all said operating parameters mains voltage, output temperature and energy consumption or power consumption in a method of regression analysis and calculated using a polynomial-type correction or compensation formula.
  • the aforementioned compensation formula is generally predetermined for a furnace type and enters the algorithm of the basic control program.
  • a control variable in particular the heating time to a predetermined temperature, is displayed continuously.
  • the user obtains information that is very useful for planning certain work processes.
  • the furnace current is measured to determine the energy consumption or power consumption.
  • the energy consumption during a complete temperature control process in particular during the entire heating, determined and provided the value determined for a display and / or stored.
  • the energy consumption can be determined and displayed or further processed, for example, during an entire baking process or during otherwise preselected time periods, especially during the entire service life of the oven.
  • the Energy consumption or power consumption stored according to one or more predetermined memory regime and kept the memory contents usefully accessible after multiple polling regime. Also an indication of the energy costs is possible on this basis, if additionally the energy price is entered.
  • a reference value of the energy consumption or of the power consumption is stored and subjected to the currently determined energy consumption or the current power consumption of a threshold discrimination and an error signal is output when a predetermined difference threshold value is exceeded.
  • a further, relatively independent functionality of the proposed method can be derived: It can be compared of the stored after a summation regime total energy consumption from successive temperature control programs with a reference sum of energy consumption and upon receipt of the reference sum value, a notification signal is output via a user interface or a purge control signal.
  • a cleaning program can be started automatically, however, this will be expediently dependent on confirmation by the user.
  • an algorithm and / or input and / or output variables for the determination of the static and dynamic correction variable can be changed via a user interface or external interface.
  • additional correction values can be taken into account or a more sophisticated compensation mode can be implemented in coordination with furnace designs of different comfort and price classes or also for subsequent upgrading.
  • the method according to the invention provides that the value of a parameter resulting from the control program taking into account the static and dynamic correction variable, in particular the heating time to a predetermined temperature or the heating curve increase, is stored and subjected to a threshold value discrimination with the corresponding value of previous program sequences Exceeding a predetermined differential threshold, an error signal is output.
  • insulation faults which go beyond normal aging phenomena and impair the furnace function and substantially increase the energy consumption can be detected and displayed for the user. This can then a corresponding Check for isolation.
  • it can already be detected, for example, in the first phase of a heating process initiated by the user, whether the furnace is loaded or not. If this is not the case, the issue of the mentioned error signal can alert the user to the erroneous triggering of the heating process or to the fact that he has forgotten to put the food in the oven.
  • Preferred embodiments of the temperature control unit according to the invention and of the furnace equipped therewith reflect the aforementioned method aspects as device features, so that reference is expressly made to this.
  • An essential component of the temperature control unit according to the invention is therefore a correction stage for the mathematical consideration of the static correction variable and the dynamic correction variable for obtaining the control program.
  • the control unit comprises a program memory section for storing the control program resulting from the correction quantity or the correction variables or a corrected control variable for linking to the basic control program. Furthermore, as a rule, means for (intermediate) storage of the relevant values of the correction variable (s) will be provided.
  • the temperature control unit is further provided with a reference value memory unit for storing a reference value of that control variable, from the comparison processing of which the relevant value of the correction variable results, and a Be assigned measuring device for measuring actual values of the corresponding control variable.
  • the comparison processing takes place in a processing unit, which forms the essential part of the correction stage in this embodiment.
  • a user interface or external interface for changing the basic control program or an algorithm and / or of input and / or output variables for determining the static and dynamic correction quantity are provided. It is understood that such a user interface comprises suitable input means.
  • the proposed temperature control unit comprises, in particular in a variant designed for the dynamic correction of the basic control program, a controller which in each case initiates and controls the correction process and the laying down of the new control program.
  • the further proposed oven also reflects the method aspects discussed above as device aspects, particularly insofar as they do not directly relate to the formation and execution of the control program but to peripheral processes.
  • the furnace according to the invention has suitable measuring devices with which the actual value of the control variable to be measured for determining the static correction variable or the current values of the operating parameters used to determine the dynamic correction variable are to be recorded.
  • this is a heating-time measuring device or a mains voltage measuring device and / or temperature measuring device and / or energy consumption or power consumption measuring device (which in turn will comprise a current measuring device in addition to the mentioned voltage).
  • the oven further comprises a power storage device downstream of the energy consumption or power consumption measuring device, in particular controllable according to several storage regimes, energy storage unit and / or display unit for storage or Display of a recorded or stored actual energy consumption or an actual power consumption.
  • a power storage device downstream of the energy consumption or power consumption measuring device, in particular controllable according to several storage regimes, energy storage unit and / or display unit for storage or Display of a recorded or stored actual energy consumption or an actual power consumption.
  • this comprises an energy reference value memory for storing a reference value of the energy consumption or the power consumption and a discrimination stage connected to the energy reference value memory and the energy storage unit Execution of a threshold value discrimination and for the output of an error signal when a predetermined difference threshold value between actual energy consumption and energy reference value is exceeded.
  • Another advantageous embodiment with which other furnace defects can be sensed and reported to the user in a meaningful and simple manner comprises a control variable memory with a plurality of memory areas for storing a plurality of values of actual values of the control variable which occurred during temperature control operations and a comparator unit associated with the control quantity memory for comparing the actual values that have occurred, which is designed as a discriminator stage for outputting an error signal when a predefined difference threshold value between stored actual values is exceeded.
  • Fig. 1 schematically shows a temperature-time diagram in which a straight line 1 shows a heating curve of a kitchen oven with a first set of operating parameters (output temperature T 1 , first operating voltage and first energy consumption) and a straight line 2 shows a heating curve, which consists of a current Set of operating parameters (current output temperature T 2 , current mains voltage and current energy consumption).
  • T 1 output temperature
  • T 2 current mains voltage and current energy consumption
  • the heating time difference results from a calculation using regression analysis methods, which provides a compensation formula for taking into account changes in the output temperature, the mains voltage and the energy consumption or the power consumption of the furnace.
  • the exact compensation formula depends on the furnace design and can be deduced by the person skilled in the art on the basis of the essential design parameters.
  • Fig. 2 shows a similar representation as Fig. 1 10, for another embodiment of the invention, wherein a calibration measurement is used to obtain a static correction quantity for a heating control program in a concrete furnace instance.
  • the straight line 1 designates a reference heating curve of a furnace of a standard thermal design assumed in the determination of a basic control program, while the straight line 2' depicts the heating behavior of a concrete furnace specimen which has been measured. As the starting temperature, zero is assumed here in a simplified manner.
  • the graph shows that with reference to a target temperature T Z, a heating time difference ⁇ t 'occurs.
  • this time difference does not reflect variable operating parameters, but rather deviations of the static thermal parameters of a specific oven instance from the standard parameters assumed in the basic control program. These deviations can be over the heating time difference .DELTA.t 'for the control of the concrete oven copy sufficiently accounted for without the relevant thermal parameters have to be recorded in detail and computationally processed.
  • Fig. 3 is an extended view of the graph according to Fig. 2 including heating curves 1B 'or 2B' of a loaded standard oven or of the loaded concrete oven item for which the heating curve 2 'was determined in the empty state. Also for the loaded oven, the deviation of the heating characteristic of that of the reference furnace can be considered sufficiently by the heating time difference .DELTA.t '.
  • the temperature control program of the furnace is so independent of the load with special food sufficiently accurately deducible by taking into account the correction variable heating time difference from the basic control program.
  • the calibration method is based on a linear model of the heating phase, wherein the rise of the heating curve (the straight line 1 'or 2') depends on the thermal mass M of the furnace.
  • This thermal mass consists of the thermal mass of the actual furnace and that of the load.
  • this simple model does not accurately reflect the actual thermal conditions, but effects of the insulation and specifics of the heating elements can be treated with sufficient accuracy as thermal mass aspects within this model.
  • the measurement of the heating time difference relative to the reference furnace on a concrete unloaded furnace specimen provides a value which is sufficient even in any state of use of the furnace to take account of the static thermal parameters.
  • Fig. 4 shows a schematic representation of the essential functionality of a furnace 10 according to an embodiment of the invention, in particular its temperature control unit 20. From the oven 10 in the figure, a display unit 11 and an operating unit 12 and the upper part of the baking chamber 13 with a heating element 14 and a baking chamber Temperature sensor 15 shown. Furthermore, a real-time clock 16 with (not separately designated) timer or stop function is shown.
  • the heating element 14 is connected to a Walkerstrombooks 17, and this are assigned as a transducer for relevant operating parameters, a voltage measuring device 18 and a current measuring device 19 for detecting the current mains voltage or flowing through the heating furnace current.
  • the temperature control unit 20 is the input side to the control unit 12, the oven temperature sensor 15, the real-time clock 16 and the voltage and current measuring devices 18, 19 and the output side connected to the Schustrombooks 17.
  • Main functional elements of the temperature control unit 20 are a first program memory section 21 for manufacturer-side storage of a basic control program, a second program memory section 22 for storing a currently valid control program of the individual oven 10, a first main memory section 23 for storing reference values of the relevant operating parameters and control variables second main memory section 24 for storage the currently valid values of the corresponding operating parameters or control variables and a correction stage 25.
  • the input-side connections of the temperature control unit 20 lead to the correction stage 25, and this is the output side connected to the second program memory section 22.
  • the correction stage 25 comprises a static correction quantity calculation unit 26 and a dynamic correction quantity calculation unit 27 from the acquired operating parameters, and finally a compensation formula memory 28 for storing the compensation formula underlying the determination of the dynamic correction quantity.
  • the calculation unit 26 is connected on the input side to the real-time clock 16 and the first main memory section 23, and the processing unit 27 is provided with the measuring devices 15, 18 and 19 on the input side and optionally also with the first main memory section and / or the second main memory section (for taking into account reference values of the relevant operating parameters or for inclusion between-stored values in the determination of the valid dynamic correction variable).
  • the processing unit 27 is provided with the measuring devices 15, 18 and 19 on the input side and optionally also with the first main memory section and / or the second main memory section (for taking into account reference values of the relevant operating parameters or for inclusion between-stored values in the determination of the valid dynamic correction variable).
  • the oven has an information unit 30 whose input side connections correspond to those of the temperature control unit 20 and the output side is connected to the display unit 11 and serves to provide additional information or warnings to the user.
  • the information unit 30 comprises a multiplier stage 31 connected to the voltage measuring device 18 and the current measuring device 19 for determining the power consumption of the oven and an energy storage unit 32 connected to the real time clock 16 and having a different predetermined memory structure can be programmed and interrogated via the operating unit 12 in order to display a power consumption registered during certain operating phases of the oven operation.
  • the information unit 30 includes a control variable memory 33 with a plurality of memory areas for storing heating time values in tabular assignment to specific target temperatures.
  • the information unit 30 includes an energy reference value memory 35, which is connected to an input of an energy discriminator 36 whose other input is connected to the multiplier stage 31 and which serves to execute a threshold discrimination of the current power consumption of the oven 10 with a reference value stored by the manufacturer , Upon detection of an impermissibly large deviation between the two values, the energy discriminator stage 36 outputs a notification or error signal to the user via the display unit 11 of the oven.
  • the information unit 30 comprises a remaining time determination stage 37 which is connected on the input side with the real time clock 16 and the control variable memory 33 and on the output side with the display unit 11 and serves for the continuous determination of the remaining heating time in the oven operation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)
  • Control Of Temperature (AREA)

Claims (21)

  1. Procédé de commande de température d'un four de cuisine (10) en vue d'atteindre une température prédéterminée (TZ) par réchauffage pendant un temps de réchauffage nécessaire sur la base d'un programme de commande, le programme de commande, à partir d'un programme de commande de base général prédéterminé pour un type de four et par prise en compte arithmétique d'une grandeur de correction statique (Δt), reflétant les paramètres individuels du four, c'est-à-dire le type de construction propre du four individuel, et une grandeur de correction dynamique (Δt') étant formée, laquelle tient compte des paramètres de fonctionnement variables du four, lesquels sont indépendants de l'exécution constructive du four,
    caractérisé en ce que la valeur d'un paramètre qui résulte du programme de commande en tenant compte de la grandeur de correction statique et dynamique (Δt, Δt'), notamment le temps de réchauffage à une température prédéterminée ou la montée de la courbe de réchauffage, est mémorisée puis soumise à une discrimination par valeur de seuil avec la valeur correspondante des déroulements antérieurs du programme et un signal de défaut est délivré en cas de dépassement d'une valeur de seuil de différence prédéterminée.
  2. Procédé selon la revendication 1, caractérisé en ce que la grandeur de correction statique (Δt) est déterminée lors d'une opération de réchauffage au four vide en comparant une valeur réelle mesurée, notamment une valeur réelle de réchauffage, avec une valeur de référence correspondant au programme de commande de base, notamment une valeur de référence de réchauffage.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la grandeur de correction dynamique (Δt') est déterminée immédiatement avant ou pendant le réchauffage à partir d'une valeur mesurée d'au moins un paramètre de fonctionnement.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la grandeur de correction statique (Δt) et/ou la grandeur de correction dynamique (Δt') utilisée est une différence de réchauffage ou un facteur de montée de courbe de réchauffage.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la grandeur de correction dynamique (Δt') est formée en tenant compte d'au moins l'un des paramètres de fonctionnement suivants : tension nominale, température de sortie et consommation d'énergie ou puissance consommée.
  6. Procédé selon la revendication 5, caractérisé en ce que la grandeur de correction dynamique (Δt') calculée est la différence de temps de réchauffage en tenant compte des paramètres de fonctionnement suivants : tension nominale, température de sortie et consommation d'énergie ou puissance consommée dans un procédé de l'analyse de régression et en utilisant une formule de compensation de type polynôme, la formule de compensation étant prédéterminée de manière générale pour un type de four.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'une grandeur de commande ou une grandeur qui en est dérivée, notamment le temps restant de réchauffage à une température prédéterminée, est affichée continuellement.
  8. Procédé selon l'une des revendications 5 à 7, caractérisé en ce que le courant du four est mesuré en plus de la tension du réseau en vue de déterminer la consommation d'énergie ou la puissance consommée.
  9. Procédé selon l'une des revendications 5 à 8, caractérisé en ce que la consommation d'énergie ou la puissance consommée est déterminée pendant une opération de commande de température complète, notamment pendant la totalité du réchauffage, et la valeur déterminée est mise à disposition et/ou mémorisée pour un affichage.
  10. Procédé selon la revendication 9, caractérisé en ce que la consommation d'énergie ou la puissance consommée est mémorisée selon un ou plusieurs régimes de mémorisation prédéterminés et le contenu de la mémoire est maintenu consultable selon au moins un régime d'invocation correspondant au régime de mémorisation.
  11. Procédé selon la revendication 9 ou 10, caractérisé en ce qu'une valeur de référence de la consommation d'énergie ou de la puissance consommée est mémorisée et soumise à une discrimination de valeur de seuil avec la consommation d'énergie ou la puissance consommée actuelle et un signal de défaut est délivré en cas de dépassement d'une valeur de seuil de différence prédéterminée.
  12. Procédé selon la revendication 10 ou 11, caractérisé en ce que la consommation d'énergie totale résultant des programmes de commande de température successifs mémorisée selon un régime d'addition est comparée avec une valeur totale de référence de la consommation d'énergie et, lorsque la valeur totale de référence est atteinte, un signal de notification est délivré par le biais d'une interface utilisateur ou un signal de commande de nettoyage est émis.
  13. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un algorithme et/ou des grandeurs d'entrée et/ou de sortie pour la détermination de la grandeur de correction statique et/ou dynamique (Δt, Δt') peuvent être modifiés par le biais d'une interface utilisateur.
  14. Unité de commande de température (20) d'un four de cuisine (10), conçue pour mettre en oeuvre le procédé selon l'une des revendications précédentes, comprenant une première portion de mémoire de programme (21) servant à mémoriser le programme de commande de base, un étage de correction (25) servant à la prise en compte arithmétique de la grandeur de correction statique et de la grandeur de correction dynamique en vue d'obtenir le programme de commande et
    comprenant une deuxième portion de mémoire de programme (22) servant à mémoriser le programme de commande obtenu avec la grandeur de correction ou les grandeurs de correction ou une grandeur de commande corrigée destinée à être combinée avec le programme de commande de base, caractérisée en ce que l'étage de correction (25) possède une unité de mémorisation de valeur de référence (23) servant à mémoriser une valeur de référence de la grandeur de commande et
    une unité de calcul servant à calculer la grandeur de correction statique à partir de la valeur de référence et d'une valeur réelle mesurée, la sortie de l'unité de calcul étant reliée à l'entrée de la deuxième portion de mémoire de programme et l'unité de calcul possédant un étage de soustraction destiné à former une différence de temps de réchauffage, en tant que grandeur de correction statique, à partir d'une valeur de référence de temps de réchauffage et d'une valeur réelle de temps de réchauffage.
  15. Unité de commande de température selon la revendication 14, caractérisée en ce que l'étage de correction (25) possède une unité de traitement comprenant au moins une entrée de paramètre de fonctionnement destinée à calculer la grandeur de correction dynamique à partir d'au moins l'un des paramètres de fonctionnement suivants : tension nominale, température de sortie et consommation d'énergie ou puissance consommée, notamment d'après une formule de compensation de type polynôme et en utilisant un procédé de l'analyse de régression.
  16. Unité de commande de température selon la revendication 15, caractérisée en ce que l'étage de correction (25) possède une mémoire de formule de compensation (28) reliée à une entrée de l'unité de traitement et destinée à mémoriser une formule de compensation prédéterminée de manière générale pour un type de four.
  17. Unité de commande de température selon l'une des revendications 14 à 16, caractérisée par une interface utilisateur (12) ou une interface externe servant à modifier le programme de commande de base et/ou un algorithme et/ou des grandeurs d'entrée et/ou de sortie pour la détermination de la grandeur de correction statique et/ou dynamique.
  18. Four de cuisine (10) équipé d'une unité de commande de température selon l'une des revendications 14 à 17, un dispositif de mesure de grandeurs de commande (16) destiné à acquérir la valeur réelle mesurée en vue de déterminer la grandeur de correction statique, notamment un dispositif de mesure de temps de réchauffage, et/ou un dispositif de mesure de paramètre de fonctionnement (15, 18, 19) destiné à mesurer une valeur réelle de paramètre de fonctionnement utilisée pour la détermination de la grandeur de correction dynamique, notamment un dispositif de mesure de la tension et/ou un dispositif de mesure de la température et/ou un dispositif de mesure de la consommation d'énergie ou de la puissance consommée, étant présents, le dispositif de mesure de grandeurs de commande ou de paramètre de fonctionnement étant relié à une entrée de l'étage de correction (25) de l'unité de commande (20), caractérisé par
    une mémoire de grandeurs de commande (33) comprenant plusieurs zones de mémoire servant à mémoriser plusieurs valeurs des valeurs réelles de la grandeur de commande qui se produisent lors des opérations de commande de température et
    une unité de comparaison (34) associée à la mémoire de grandeurs de commande, servant à comparer les valeurs réelles produites et qui est configurée comme un étage discriminateur destiné à délivrer un signal de défaut en cas de dépassement d'une valeur de seuil de différence prédéterminée entre les valeurs réelles mémorisées.
  19. Four selon la revendication 18, caractérisé en ce que le dispositif de mesure de la consommation d'énergie ou de la puissance consommée possède un dispositif de mesure de la tension du réseau (18) et un dispositif de mesure du courant du four (19) et un étage multiplicateur (31) relié à leurs sorties.
  20. Four selon la revendication 18 ou 19, caractérisé par une unité de mémoire d'énergie (32) et/ou une unité d'affichage (11) branchée en aval du dispositif de mesure de la consommation d'énergie ou de la puissance consommée (18, 19, 31) et pouvant notamment être commandée selon plusieurs régimes de mémoire, servant à mémoriser ou à afficher une consommation d'énergie réelle ou une puissance consommée réelle acquise ou mémorisée.
  21. Four selon l'une des revendications 18 à 20, caractérisé par une mémoire de valeur de référence d'énergie (35) servant à mémoriser une valeur de référence de la consommation d'énergie ou de la puissance consommée et un étage discriminateur (36) relié à la mémoire de valeur de référence d'énergie et à l'unité de mémoire d'énergie (32) servant à exécuter une discrimination de valeur de seuil et à délivrer un signal de défaut en cas de dépassement d'une valeur de seuil de différence prédéterminée entre la consommation d'énergie réelle et la valeur de référence d'énergie.
EP06002097.1A 2005-04-15 2006-02-02 Procédé et dispositif de commande de la température d'un four de cuisson Ceased EP1712844B1 (fr)

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US20060231551A1 (en) 2006-10-19
DE102005017617A1 (de) 2006-10-26
US7554061B2 (en) 2009-06-30
EP1712844A2 (fr) 2006-10-18
EP1712844A3 (fr) 2017-12-20

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