EP1712844A2 - Procédé et unité de commande de la température d'un four de cuisson - Google Patents

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

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Publication number
EP1712844A2
EP1712844A2 EP06002097A EP06002097A EP1712844A2 EP 1712844 A2 EP1712844 A2 EP 1712844A2 EP 06002097 A EP06002097 A EP 06002097A EP 06002097 A EP06002097 A EP 06002097A EP 1712844 A2 EP1712844 A2 EP 1712844A2
Authority
EP
European Patent Office
Prior art keywords
power consumption
furnace
oven
value
temperature
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
Application number
EP06002097A
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German (de)
English (en)
Other versions
EP1712844A3 (fr
EP1712844B1 (fr
Inventor
Florian Ruther
Martin Andersson
Maike Müller
Christoph Walther
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.)
Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
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Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Publication of EP1712844A2 publication Critical patent/EP1712844A2/fr
Publication of EP1712844A3 publication Critical patent/EP1712844A3/fr
Application granted granted Critical
Publication of EP1712844B1 publication Critical patent/EP1712844B1/fr
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Classifications

    • 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 furnace, in particular a kitchen oven, and a temperature control unit of such a furnace for carrying out this method and finally a suitably equipped oven.
  • 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.
  • 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 relatively independent idea of taking into account a dynamic correction variable or correction formula in the control program, which enables 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-up time difference or a heating-curve increase factor is preferably used as the static correction variable and / or the dynamic correction quantity, which is a deviation of the rise of a corrected heating curve from that of a Referehzkurve as a multiplication factor reflects.
  • the dynamic correction quantity is formed considering at least one of the operating parameters of mains voltage, output temperature and energy consumption or power consumption.
  • This is, in one expedient embodiment, calculated as a dynamic correction variable, the heating time difference by taking into account all mentioned operating parameters mains voltage, output temperature and energy consumption or power consumption in a process of regression analysis and using a correction or compensation formula of the polynomial type.
  • 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 approximately during an entire baking process or during otherwise preselected periods of time, especially during the lifetime of the furnace, determined and displayed or further processed.
  • the energy consumption or the power consumption is stored in accordance with one or more predetermined memory regimes and the memory contents usefully kept accessible after several polling regimes. 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 the power consumption is stored and subjected to threshold discrimination with the currently determined energy consumption or the current power consumption, and an error signal is output when a predetermined difference threshold value is exceeded ,
  • this procedure allows the detection of subsequently defective heating elements and can empower the user to carry out an appropriate repair performance.
  • an algorithm and / or input and / or output variables for determining the static and / or 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.
  • Yet another relatively independent feature of the proposed method provides that the value of a resulting from the control program taking into account the static and / or dynamic Korrekturgrö- ⁇ e parameters, in particular the heating time to a predetermined temperature or the Auffastkurven-increase, stored and with subjected to the corresponding value of earlier programs a threshold discrimination and when exceeding a predetermined differential threshold, an error signal is output.
  • 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 / or 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 / or dynamic correction variable 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 Temperäturmess boots and / or energy consumption or power consumption measuring device (which in turn, in addition to the voltage mentioned a current measuring device will include).
  • 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 discriminator stage connected to the energy reference value memory and the energy storage unit for carrying out a threshold value discrimination and for outputting 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 detected and reported to the user in a useful 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 variable memory for comparing the occurred actual values, which is designed as a discriminator stage for outputting an error signal when a predetermined difference threshold value is exceeded between stored actual values.
  • Fig. 1 shows schematically 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, the from a current set of operating parameters (current output temperature T 2 , current line voltage and current energy consumption) results.
  • a heating-up time difference ⁇ t results.
  • the consideration of this heating time difference at the predetermined target temperature in the context of a basic control program for the heating process thus reflects the current values of the operating parameters and thus provides an appropriate correction of the basic control program.
  • a regulation of the mains voltage or power consumption (in terms of constant maintenance) or the starting temperature for the heating process is dispensed with and nevertheless a high degree of accuracy and reliability of the program control is achieved.
  • 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, for another embodiment of the invention, in which is obtained by a calibration measurement, a static correction variable for a heat-up control program in a specific oven example:
  • the straight line. 1 A reference heating curve of an assumed in the determination of a basic control program oven with a standard thermal construction, while the straight line 2' depicts the heating behavior of a specific oven example, which was detected by measurement. 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 enlarged view of the graph of FIG. 2, including heating curves 1B 'and 2B' of a loaded standard oven or loaded concrete oven example 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 illustration of the essential functionality of a furnace 10 according to an embodiment of the invention, in particular of its temperature control unit 20. From the furnace 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 14th 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 storing the currently valid values of the corresponding ones Operating parameters or control variables and a correction level 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 stage 36 whose another input is connected to the multiplier stage 31 and which serves to execute a threshold value discrimination of the current power consumption of the oven 10 with a reference value stored by the manufacturer.
  • the energy discriminator stage 36 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.
  • the embodiment of the invention is not limited to the above-explained aspects of the temperature control method or the respective correction (compensation) and the embodiment of an oven described below, but also in a variety of procedural and device-side modifications possible. In particular, all technically meaningful combinations of claim features are to be regarded as lying within the scope of the invention.

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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)
EP06002097.1A 2005-04-15 2006-02-02 Procédé et dispositif de commande de la température d'un four de cuisson Active EP1712844B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005017617A DE102005017617A1 (de) 2005-04-15 2005-04-15 Verfahren zur Temperatursteuerung und Temperatursteuereinheit eines Ofens

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EP1712844A2 true EP1712844A2 (fr) 2006-10-18
EP1712844A3 EP1712844A3 (fr) 2017-12-20
EP1712844B1 EP1712844B1 (fr) 2019-08-21

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DE (1) DE102005017617A1 (fr)

Cited By (7)

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EP1998116A1 (fr) 2007-05-30 2008-12-03 Whirlpool Corporation Processus de contrôle automatique du chauffage/cuisson d'un aliment dans un four de cuisson et four de cuisson adapté pour effectuer un tel procédé
WO2012019891A1 (fr) * 2010-08-09 2012-02-16 BSH Bosch und Siemens Hausgeräte GmbH Appareil électroménager présentant une plaque de cuisson et procédé d'affichage de la consommation d'énergie
EP2604930A1 (fr) * 2011-12-16 2013-06-19 Electrolux Professional S.p.A. Équipement de cuisson et procédé de fonctionnement d'un équipement de cuisson
EP2604929A1 (fr) * 2011-12-16 2013-06-19 Electrolux Professional S.p.A. Équipement de cuisson et procédé de détection des conditions de fonctionnement d'un équipement de cuisson
EP2110605B1 (fr) * 2008-04-15 2015-07-01 Whirlpool Corporation Procédé de cuisson
EP2587164A3 (fr) * 2011-10-31 2017-09-20 BSH Hausgeräte GmbH Appareil de cuisson avec un affichage et procédé de signalisation pour un appareil de cuisson
WO2021037821A1 (fr) * 2019-08-30 2021-03-04 BSH Hausgeräte GmbH Table de cuisson et système de table de cuisson, procédé et appareil de commande, et support de stockage

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DE102008028027A1 (de) * 2008-06-12 2009-12-17 BSH Bosch und Siemens Hausgeräte GmbH Hausgerätvorrichtung
JP5530676B2 (ja) * 2008-08-20 2014-06-25 ホシザキ電機株式会社 加熱調理器
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JP5170464B2 (ja) * 2009-10-30 2013-03-27 株式会社島津製作所 ガスクロマトグラフ
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US8426777B2 (en) * 2010-05-19 2013-04-23 Whirlpool Corporation Oven control utilizing data-driven logic
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KR102207463B1 (ko) * 2014-04-14 2021-01-26 삼성전자주식회사 오븐 및 그 제어 방법
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EP3517842B1 (fr) * 2018-01-24 2023-07-12 Electrolux Appliances Aktiebolag Procédé de fonctionnement d'une entité de préparation alimentaire
DE102018205331A1 (de) * 2018-04-10 2019-10-10 BSH Hausgeräte GmbH Erfassen von Betriebsparametern eines Behandlungsraums eines Haushaltsgeräts
DE102018115538A1 (de) * 2018-06-27 2020-01-02 Rational Aktiengesellschaft Kalibrierungssystem, Küchensystem sowie Verfahren zum Betreiben eines Kalibrierungssystems
CN114963497B (zh) * 2021-07-12 2023-12-12 青岛经济技术开发区海尔热水器有限公司 热水器水温修正控制方法、装置、电子设备及存储介质
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1998116A1 (fr) 2007-05-30 2008-12-03 Whirlpool Corporation Processus de contrôle automatique du chauffage/cuisson d'un aliment dans un four de cuisson et four de cuisson adapté pour effectuer un tel procédé
EP2110605B1 (fr) * 2008-04-15 2015-07-01 Whirlpool Corporation Procédé de cuisson
WO2012019891A1 (fr) * 2010-08-09 2012-02-16 BSH Bosch und Siemens Hausgeräte GmbH Appareil électroménager présentant une plaque de cuisson et procédé d'affichage de la consommation d'énergie
EP2587164A3 (fr) * 2011-10-31 2017-09-20 BSH Hausgeräte GmbH Appareil de cuisson avec un affichage et procédé de signalisation pour un appareil de cuisson
EP2604930A1 (fr) * 2011-12-16 2013-06-19 Electrolux Professional S.p.A. Équipement de cuisson et procédé de fonctionnement d'un équipement de cuisson
EP2604929A1 (fr) * 2011-12-16 2013-06-19 Electrolux Professional S.p.A. Équipement de cuisson et procédé de détection des conditions de fonctionnement d'un équipement de cuisson
US9194590B2 (en) 2011-12-16 2015-11-24 Electrolux Professional S.P.A. Cooking equipment and a method of operating a cooking equipment
US9267692B2 (en) 2011-12-16 2016-02-23 Electrolux Professional S.P.A. Cooking equipment and a method of detecting operating conditions of a cooking equipment
WO2021037821A1 (fr) * 2019-08-30 2021-03-04 BSH Hausgeräte GmbH Table de cuisson et système de table de cuisson, procédé et appareil de commande, et support de stockage

Also Published As

Publication number Publication date
EP1712844A3 (fr) 2017-12-20
US7554061B2 (en) 2009-06-30
DE102005017617A1 (de) 2006-10-26
US20060231551A1 (en) 2006-10-19
EP1712844B1 (fr) 2019-08-21

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