EP3267114A1 - Procédé de commande d'un four de cuisson et four de cuisson - Google Patents

Procédé de commande d'un four de cuisson et four de cuisson Download PDF

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Publication number
EP3267114A1
EP3267114A1 EP17179788.9A EP17179788A EP3267114A1 EP 3267114 A1 EP3267114 A1 EP 3267114A1 EP 17179788 A EP17179788 A EP 17179788A EP 3267114 A1 EP3267114 A1 EP 3267114A1
Authority
EP
European Patent Office
Prior art keywords
temperature
oven
switching
phase
muffle
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
EP17179788.9A
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German (de)
English (en)
Other versions
EP3267114B1 (fr
Inventor
Konrad SCHÖNEMANN
Rolf Seeburger
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
Priority date (The priority date 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 date listed.)
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Publication date
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Publication of EP3267114A1 publication Critical patent/EP3267114A1/fr
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Publication of EP3267114B1 publication Critical patent/EP3267114B1/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
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/085—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on baking ovens

Definitions

  • the invention relates to a method for controlling a baking oven and an oven suitable for carrying out this method.
  • Various methods for controlling ovens are known. Rather simply designed oven models have an electromechanical temperature control for a muffle heater in a baking oven muffle. This has a temperature setting, advantageously via a mechanical operating element such as a rotary switch or a turntable, a mechanical temperature sensor and a switching contact.
  • the mechanical temperature sensor often consists of a pipe system which is filled with a temperature-dependent expandable oil and has a slightly larger, connected to the pipe system and filled with oil body in the oven muffle as a temperature sensor. At the other end, the pipe system is connected to a so-called expansion box, see for example the EP 962951 A2 , This can thereby switch a switching contact that a set by means of the temperature setting by an operator temperature is reached in the baking oven muffle. Then the temperature control clocks, so to speak, the operation of the muffle heater to keep approximately the set temperature in the oven muffle.
  • the invention has for its object to provide an aforementioned method for controlling a baking oven and an oven suitable for carrying out this method, with which problems of the prior art can be avoided and it is particularly possible to easily a oven to control and above all to be able to control an oven in an energy-saving mode, without having to change the design or the structure of the oven significantly.
  • the oven to be controlled by the method according to the invention has an oven muffle, a muffle heater and an electromechanical temperature control for the muffle heater.
  • the electromechanical temperature control has a temperature setting, a mechanical temperature sensor and a switching contact.
  • Such an electromechanical temperature control is advantageously designed as described in the prior art, for example in the aforementioned EP 962951 A2 ,
  • the electromechanical temperature control is adapted to set in the baking oven muffle by controlling the muffle heater, preferably by an aforementioned clocking, set a mechanically at the temperature setting oven temperature. In such a cycle, the muffle heater is either operated at full power or is off.
  • the method comprises the following steps. First, starting from a cold oven, the switch contact is closed and turned on the muffle heater. This therefore begins with the heating operation, namely the oven muffle is heated for the duration of a so-called preheat phase.
  • the preheat phase is ended when the mechanical temperature sensor responds the first time and opens the switch contact. This occurs because a temperature on the mechanical temperature sensor has exceeded a corresponding to the set oven temperature switching temperature. This switching temperature may agree with the set temperature, but it does not have to. However, this is something that occurs when setting or adjusting the electromechanical temperature control when manufactured in the factory and therefore has no effect on the invention. In any case, it is about the first opening or switching of the switch contact by the temperature sensor.
  • a temperature hold phase In this temperature maintenance phase, the temperature in the oven muffle is controlled by switching the switch contact by the electromechanical temperature control or by the temperature sensor to the set oven temperature. But this is also known from conventional electromechanical ovens.
  • a duration of the temperature maintenance phase corresponding to a number of switching operations of the switching contact in a power control device of the oven is stored. In the power control device while no time is measured to determine the duration of the temperature maintenance phase. Rather, for example, a number of ten switching operations of the switching contact in the power control device is stored, so that the temperature maintenance phase so long ten switching operations should last.
  • each time switching is evaluated as a switching operation.
  • the temperature maintenance phase is advantageously different from zero or it has a minimum duration, particularly advantageous at least once switching on the muffle heater.
  • the temperature-holding phase ends. Then begins a power control phase, advantageously directly thereafter, with a constant ratio of duty cycle to clock period, which is also called ratio ED in the following.
  • a clock period consists of a duty cycle and a subsequent turn-off. If during the temperature maintenance phase the temperature was regulated to the set oven temperature, only the power put into the oven will be controlled in the power control phase.
  • the predetermined ratio and then stored in the power control device ratio ED is used to control an additionally connected in the control of the muffle heater auxiliary switch to turn on and off the muffle heater that only the auxiliary switch switches the muffle heater and not more the aforementioned switching contact during the temperature maintenance phase. This switching contact is always closed.
  • the ratio ED is selected such that a temperature which is established in the steady state of the oven during the power control phase is below the desired temperature, so that the oven or oven muffle thus has a temperature below the set oven temperature.
  • the essence of the invention is essentially to effect operation with a temperature which is slightly below the adjusted oven temperature with a simple electromechanical temperature control without accurately detecting the temperature actually prevailing in the oven or in the baking oven muffle.
  • the duration of the preheating measured ie until the first switching of the switch contact, and if this has taken only a relatively short time, so there is expected to be a lower set oven temperature. If the preheating period lasts longer, ie until the oven has heated up to approximately the desired set oven temperature, then the set oven temperature is probably higher. In the power control phase is no longer regulated to an exact set temperature, but it is fed to a well-defined power, so it is so to speak only controlled or power controlled.
  • the temperature which is established in the steady state of the oven during the power control phase may be between 10K and 40K below this desired temperature. It can be advantageous between 12K and 25K.
  • Such a reduction in temperature causes an only imperceptible change in the cooking result, so that a cooking or baking process carried out in the oven essentially proceeds as desired by an operator. Possibly. The cooking or baking process takes a little longer. At the same time, however, this can save a considerable amount of energy.
  • the electromechanical temperature control to a thermostat, which is particularly advantageous provided with a temperature-dependent expanding oil thermostat.
  • thermostats are known from the aforementioned prior art.
  • the power control device may have an additional printed circuit board with a microcontroller thereon for a control of the power control device and for timer functions and with the additional switch. These components are therefore provided on the additional circuit board. It is connected so that preferably the additional switch is connected in series with the switching contact of the electromechanical temperature control, particularly preferably before.
  • a heating operation of the muffle heater can be interrupted by one of the two switches alone.
  • only the auxiliary switch as explained above, can turn on and off the muffle heater in a simple manner.
  • This additional circuit board is a part that is then installed in an oven according to the invention. A subsequent installation in an oven, for example, if it is already installed by an operator in the kitchen, may be too expensive.
  • a self-existing construction of a baking oven can thus easily be supplemented at the factory.
  • an operating mode selector switch as has been mentioned at the outset, which can also be used to start the method
  • an additional circuit board can advantageously be fastened to the operating mode selector switch, particularly advantageously at its rear end.
  • the additional switch but fail or, for example, no longer open, it can be done by the series connection of the two switches switching off the muffle heater by the switch contact in any case. Furthermore, in such an error case, an unsafe device state is avoided by at least one safety temperature limiter which is already present as standard in the known oven.
  • the microcontroller can operate the oven for a certain time in or with the power control phase.
  • the oven is operated in the energy-saving mode or in the power control phase until it is completely switched off by the operator or until the energy-saving mode is ended, advantageously again by a switching operation on said mode selector switch.
  • it can be detected on the basis of the duration of the preheating phase, whether the oven muffle is heated to a rather high or a rather low temperature.
  • a long pre-heating phase it can be concluded that the temperature has been set rather high and, with a short preheating phase, a rather low set temperature.
  • the duration of the power control phase can be dimensioned as a function of the duration of the preheating phase. It may then be advantageous to assume that during a heating to a relatively high temperature and the power control phase should last relatively short and should also take a relatively low temperature and the power control phase is relatively long in a warm-up.
  • To terminate the energy-saving mode can either be provided that the operator switches off this energy-saving mode, for example on the mode selector switch or on a control element of the temperature setting, which could possibly be turned off the whole oven.
  • it may be programmed in the controller that the power control phase or the energy-saving mode is terminated after a preprogrammed time. This time is then stored in the controller. It may, for example, depend on the set oven temperature, which can be approximately detected or estimated as described above.
  • a timer-controlled termination of the power control phase may be provided, so that, for example, in the energy-saving mode, the oven is always switched off after two or a maximum of three hours.
  • the additional switch is designed as a relay. As a result, it can be easily controlled by the mentioned microcontroller together with simple control.
  • the microcontroller can recognize via its own input whether and when the temperature control switches the muffle heater on via the switching contact and switches it off. Thus, the microcontroller can start the power control phase just after a predetermined number of switching operations of the temperature maintenance phase.
  • the number of switching operations during the temperature maintenance phase depends on a duration of the preheating phase, which can indeed be detected by the microcontroller. With a long duration of the preheating phase until the first switching of the switching contact by the temperature sensor or the temperature control, the number of switching operations in the temperature maintenance phase can be rather larger. With a short duration until the first switching of the switching contact, the number of switching operations in the temperature maintenance phase may be rather smaller, so that the power control phase starts earlier. Usually, the number of switching operations in the temperature maintenance phase can be between 1 and 10.
  • the amount of energy given to the muffle heater is determined by the additional switch, particularly advantageously only by the additional switch. So it only switches the additional switch and not the switching contact, or the electromechanical temperature control comes here, so to speak, not used, since the switching contact simply remains closed.
  • a time interval of the clock or the frequency of clocking the additional switch via the microcontroller per time selected in a size that is close to the behavior of the switch contact during the temperature maintenance phase.
  • a clock interval may be between two and five minutes, and the division within that interval between a single duty cycle and a single turn-off duration is just determined by the ratio ED.
  • an inventive oven 1 is shown with a baking oven muffle 2, in the bottom of a muffle heater 3 is arranged.
  • This can be electrical, but in principle also function or operate as desired.
  • the operating mode selector switch 11 is connected to a signal display 19, for example to indicate when the oven is in operation and especially when it is in an energy-saving mode according to the invention is.
  • a temperature setting 21 is provided with rotary knob 22.
  • rotary knob 22 This is in principle designed exactly as in the prior art, by turning the rotary knob 14, a temperature can be adjusted by means of a temperature scale indicated on the front, which is then generated by the oven 1 in the oven muffle 2 by operation of the muffle heater 3.
  • the muffle heater 3 is operated advantageous clocking when it operates electrically or with gas, by switching with full power on the one hand and zero power on the other.
  • such devices for temperature adjustment are known in the art.
  • a switching contact 24 is provided in a housing 23 of the temperature setting 21, the switching path can be adjusted by the rotary knob 22.
  • On the switching contact 24 also acts an expansion box 26 of a mechanical temperature sensor in the form of a sensor tube 27 which is connected by means of a capillary tube 28 with the expansion box 26.
  • This is an oil which expands depending on the temperature, in particular as a function of the temperature at the sensor tube 27, which according to the Fig. 1 is arranged in the top of the oven muffle 2.
  • Expansion box 26, sensor tube 27 and capillary 28 form with their action on the switch contact 24 so an electromechanical temperature control for the muffle heater 3 and for the oven 1.
  • EP 962951 A2 referenced, in which the operation including the interaction with the rotary knob 22 is explained.
  • a structure of the mode selector switch 11 is shown having a housing 12.
  • a mode selector switch 11 is also constructed according to the prior art.
  • different modes for the oven 1 can be specified, namely electromechanical.
  • modes such as bottom heat, top heat, bottom heat plus top heat, grill, hot air or the like.
  • the associated temperature or grill level is then adjusted via the temperature setting 21 by an operator.
  • a further rotational position is provided on the mode selector switch 11 in comparison to a conventionally designed mode selector switch with switching contacts for a method according to the invention or a previously described energy-saving mode.
  • an additional circuit board 15 is provided or attached to the back of the mode selector switch 11, on which a controller 16 in the form of a microcontroller and a relay 17 are included as the aforementioned additional switch.
  • the additional circuit board 15 is connected by means of connecting cables 18 to the mode selector switch 11.
  • the mode selector switch 11 is connected to the temperature setting 21 by means not shown cable and with a power connection of the oven.
  • the connection of mode selector switch 11 or additional circuit board 15 and temperature setting 21 is such that the controller 16 can check at an input whether the switch contact 24 is closed or when the muffle heater 3 is turned on. Likewise, the controller 16 detects when the muffle heater 3 is turned off by the switch contact 24.
  • the relay 17 is additionally connected in the control of the muffle heater 3 such that a series circuit of relay 17 and switch contact 24 may be present or such that the muffle heater 3 can be switched off by the relay 17 and the switch contact 24 by opening one of the two. To operate the muffle heater 3 relay 17 and switch contact 24 must be closed together.
  • an operator When operating the oven 11 according to the method as described in the Fig. 4 are shown, an operator has set the mode selection switch 11 to any mode other than the power save mode, for example, operation with bottom heat by the muffle heater 3 and at a temperature of 185 ° C by adjusting the temperature setting 21.
  • This switch-on delay may be due to the known inertia of the electromechanical temperature control.
  • the temperature drops to about 180 ° C.
  • the expansion box 26 switches the switch contact 24 again, it is again full power to the muffle heater 3 and the temperature rises again. This is done a few times with a cycle time of about 3.4 minutes in the normal method according to the prior art, as shown with the thick line.
  • a food was taken out of the oven 1.
  • the temperature drops significantly, but then increases again due to the further heating. In this case, it is assumed that the cooking process or the heating has not yet been completed by the user even after removing the food.
  • the cycle time can then be about 4.5 minutes. However, since nothing has been changed at the temperature setting 21, the temperature continues to vary by the set temperature of 185 ° C.
  • the mode selector switch 11 has been set to a power-saving mode, in which the muffle heater 3 is operated, and operation with bottom heat by means of the muffle heater 3 and with a temperature of 185 ° C.
  • the heating process as preheating phase runs exactly the same.
  • the muffle heater 3 is turned off for the first time. This time t 1 detects the controller 16 and concludes from this on the level of approximately set temperature of the temperature setting 21.
  • this value is not in the controller 16 or he can not be detected by this, since it is an electromechanical Temperature setting 21 acts without temperature sensor with output of a concrete temperature value.
  • the controller 16 has opened the relay 17 as an additional switch, for example, already at the same time with opening of the switch contact 24 or caused by this opening, so that the temperature initially drops further, that is not heated.
  • the preheating phase has lasted until time t 1 and the temperature maintenance phase from t 1 to t 2 , in this case only about 5 minutes, then begins, ie from t 2 , the above-described power control phase according to the invention.
  • the muffle heater 3 driven by clocking operation of the relay 17.
  • the switching contact 24 is always closed due to the lower temperature.
  • the clocking operation is controlled with a constant ratio of duty cycle to off duration as ratio ED, as explained above, and no longer temperature-controlled as in the standard method. Above all, it is performance-controlled.
  • this clocking with the ratio ED takes place relatively quickly and in any case considerably more frequently than in the standard method, for example with a period of about 1 minute.
  • the switch-off is about three times as long as the duty cycle, so that the ratio ED is about 25%.
  • This ratio of ED could also be achieved and maintained with longer on-periods and longer off-periods. This selection may depend on various aspects and be determined or programmed into the controller 16 and the corresponding microcontroller.
  • the food has been removed from the oven muffle 2. Either the operator then turns off the mode selector switch 11 this energy-saving mode or the rotary knob 22 of the temperature setting 21 the whole oven.
  • the power control phase is terminated after a preprogrammed time. This time must be stored in the controller. It can for example depend on the set oven temperature or on the duration of the preheating phase, on the basis of which the set oven temperature can be estimated.
  • a timer-controlled Termination of the power control phase be provided so that, for example, in energy-saving mode, the oven is always turned off after two or three hours.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Resistance Heating (AREA)
EP17179788.9A 2016-07-06 2017-07-05 Procédé de commande d'un four de cuisson et four de cuisson Active EP3267114B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016212329.7A DE102016212329A1 (de) 2016-07-06 2016-07-06 Verfahren zur Steuerung eines Backofens und Backofen

Publications (2)

Publication Number Publication Date
EP3267114A1 true EP3267114A1 (fr) 2018-01-10
EP3267114B1 EP3267114B1 (fr) 2019-12-25

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EP17179788.9A Active EP3267114B1 (fr) 2016-07-06 2017-07-05 Procédé de commande d'un four de cuisson et four de cuisson

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EP (1) EP3267114B1 (fr)
DE (1) DE102016212329A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118567416A (zh) * 2024-07-24 2024-08-30 湖南超弦科技股份有限公司 一种硅片生产管式炉plc均衡控温方法及相关设备
EP4457463A4 (fr) * 2021-12-30 2025-10-22 Mamur Teknoloji Sistemleri San A S Procédé de régulation de température d'un four

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056242A1 (fr) * 2001-12-31 2003-07-10 Aktiebolaget Electrolux (Publ) Procede permettant de reguler l'absorption de l'energie dans un four
DE10240175A1 (de) * 2002-08-30 2004-04-22 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb eines Gargeräts
DE102007056714A1 (de) * 2007-11-26 2009-05-28 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb eines Gargeräts und Gargerät
EP2251607A2 (fr) * 2009-05-12 2010-11-17 BSH Bosch und Siemens Hausgeräte GmbH Procédé d'exécution d'un processus de préparation pour un aliment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19824871A1 (de) 1998-06-04 1999-12-09 Ego Elektro Geraetebau Gmbh Temperaturschalter, insbesondere einstellbarer Temperaturregler
DE102011017638A1 (de) * 2011-04-27 2012-10-31 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betreiben eines Gargeräts sowie Steuer- und Regeleinrichtung für ein Gargerät und Gargerät
DE102014217637A1 (de) * 2014-09-03 2016-03-17 BSH Hausgeräte GmbH Heizen eines Garraums eines Haushalts-Gargeräts

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056242A1 (fr) * 2001-12-31 2003-07-10 Aktiebolaget Electrolux (Publ) Procede permettant de reguler l'absorption de l'energie dans un four
DE10240175A1 (de) * 2002-08-30 2004-04-22 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb eines Gargeräts
DE102007056714A1 (de) * 2007-11-26 2009-05-28 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb eines Gargeräts und Gargerät
EP2251607A2 (fr) * 2009-05-12 2010-11-17 BSH Bosch und Siemens Hausgeräte GmbH Procédé d'exécution d'un processus de préparation pour un aliment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4457463A4 (fr) * 2021-12-30 2025-10-22 Mamur Teknoloji Sistemleri San A S Procédé de régulation de température d'un four
CN118567416A (zh) * 2024-07-24 2024-08-30 湖南超弦科技股份有限公司 一种硅片生产管式炉plc均衡控温方法及相关设备

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Publication number Publication date
DE102016212329A1 (de) 2018-01-11
EP3267114B1 (fr) 2019-12-25

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