EP0291302B1 - Elektroherd - Google Patents

Elektroherd Download PDF

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Publication number
EP0291302B1
EP0291302B1 EP88304289A EP88304289A EP0291302B1 EP 0291302 B1 EP0291302 B1 EP 0291302B1 EP 88304289 A EP88304289 A EP 88304289A EP 88304289 A EP88304289 A EP 88304289A EP 0291302 B1 EP0291302 B1 EP 0291302B1
Authority
EP
European Patent Office
Prior art keywords
temperature
oven
mode
control system
oven according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88304289A
Other languages
English (en)
French (fr)
Other versions
EP0291302A2 (de
EP0291302A3 (en
Inventor
Michael Nicholas Tsisios
Robert David Smith
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 AB
Original Assignee
Electrolux AB
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.)
Filing date
Publication date
Application filed by Electrolux AB filed Critical Electrolux AB
Priority to AT88304289T priority Critical patent/ATE80935T1/de
Publication of EP0291302A2 publication Critical patent/EP0291302A2/de
Publication of EP0291302A3 publication Critical patent/EP0291302A3/en
Application granted granted Critical
Publication of EP0291302B1 publication Critical patent/EP0291302B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • This invention relates to a multiple function electric cooking oven.
  • Such an oven may comprise a roof element, side heating elements, a floor element and a convector fan surrounded by a fan element.
  • the oven may be operated in various modes in which different elements or combinations of elements are energised, and is controlled to run at pre-set temperature.
  • the position of the temperature sensor used in controlling the oven temperature is chosen as a compromise between the requirements of the various modes so that, in any particular mode, its indication does not necessarily agree with the thermostat setting.
  • the oven control system stores calibration data for the sensor in each operating mode, and thereby obtains a corrected temperature for the current mode of operation, which preferably represents the temperature at the centre of the oven.
  • the oven representated in Figure 1 is a conventional oven with an oven casing 1 and side heating elements 2.
  • An oven of this kind has only one operating mode i.e. both side elements 2 on; the temperature of the oven being varied by varying the power supply to the elements 2 and the temperature being maintained at the desired level by a known type of thermostatic device (not shown); such an oven is necessarly limited in its applications.
  • FIG. 2 shows a multifunction oven of a known kind, with a casing 3, roof heating element 4, base heating element 5, fan 6 and fan heating element 7.
  • This oven provides a greater number of modes of operation than a conventional oven, but because of the kind of temperature sensing device traditionally used in such oven, the temperature dial setting may not give an accurate indication of the temperature at the centre of the oven for all the possible modes of operation.
  • FIG. 3 shows a schematic representation of a preferred embodiment of the invention comprising; a casing 8, a roof heating element assembly 9, a base heating element 10, side elements 11, fan 12 and fan heating element 13.
  • a temperature sensor 14 forms an integral part of an oven temperature control system which itself is part of an overall electronic control system which maintains the oven at the desired temperature and ensures that the displayed oven dial temperature is an accurate representation of the centre oven temperature.
  • the roof element assembly 9 comprises two elements (not shown), namely a centre element and a lower power outer element; these elements are operable individually or in combination.
  • the element configuration shown in Figure 3 thus provides eight modes of operation as follows: hot fan convection, with the fan 12 blowing air and the fan heating element on; side elements 11 only on; roof elements 9 and base element 10 on, the roof elements 9 being connected in series and in parallel with the base element; fan 12 only on (no elements); roof elements and fan on; hot fan convection (as indicated before) now with roof elements on; hot fan convection and base element on; and base element only on.
  • All the heating elements 9, 10, 11 and 13 when in operation are connected to the mains via a closed loop feed-back temperature control system incorporating the oven temperature sensor 14, which is of the platinum resistor type and positioned in the oven cavity to give the required operating characteristic.
  • the energy is supplied to the elements via relays and the oven modes are selected by a microprocessor (not shown) which switches the elements in and out via the relays and the fan via the triac as required, the microprocessor being incorporated into the electronic control system.
  • a membrane switch panel 15 is connected to the electronic control system 16 which in turn is connected to the temperature sensor 14 via temperature sensing circuit 17 and also to the heating elements 9, 10, 11, 13.
  • the temperature sensing circuit 17 calibrates measurements from the sensor 14 in accordance with one of a number of specified calibration profiles corresponding to any heating element energisation arrangement chosen.
  • the membrane switch panel 15 incorporates most of the user operable control features of the oven and displays the selected oven mode and/or feature and the oven temperature.
  • Figure 4 shows typical calibration profiles for the temperature sensing device of this invention.
  • Curve 18 indicates the calibration characteristics for the base and hot fan mode
  • curve 19 indicates the calibration characteristics for the roof elements and cold fan mode
  • curves 20, 21, 22, 23 and 24 are the calibration characteristics for the mode utilizing, respectively, the roof/base, the side elements only, the base elements only and the roof element/hot fan.
  • the system functions as follows: the user selects the required mode of operation by activating the appropriate switch on the membrane switch panel 15; a signal to this effect is then relayed to the electronic control system 16 where a microprocessor (not shown) sends out signals to energise the required heating elements and/or fan.
  • the microprocessor simultaneously switches the temperature sensing circuit 17 to operate according to the calibration profile corresponding to the selected mode of operation, the necessary information on the calibration characteristics corresponding to the predetermined energisation arrangements being stored in the microprocessor of the electronic control system 16.
  • the temperature sensing circuit 17 is switched to operating according to curve 19 by the electronic control system 16 and thus measurements from the sensor are processed and adjusted so that the information finally sent to be displayed on the membrane switch panel 15 is a true representation of the centre oven temperature.
  • the user also has a choice of six preset features. Each one of these features can be obtained by pressing a dedicated key pad on the membrane switch panel 15; the display area of this panel is provided with an LED for each of the features, the appropriate LED being illuminated when the feature is selected.
  • the preset features include, for example, slow cook, defrost and bread proving.
  • the electronic control system automatically selects the appropriate oven mode and additionally runs the oven at a predetermined temperature for a predetermined period of time, corresponding to the feature chosen. So if, for example, 'slow cook boost′ is chosen, the oven is operated in the 'hot fan convection mode', the temperature is automatically set to 200°C for 30 minutes, thereafter being re-set to 110° for the remainder of the cooking process.
  • a principal advantage of the invention is that, regardless of the mode of operation selected by the user and/or electronic control system, the displayed dual temperature is always an accurate representation of the actual centre oven temperature. This is done by calibrating the temperature sensor 14 and temperature control system for each operational mode, so that the temperature display dial does not simply show the temperature of the temperature sensor but shows instead a corrected temperature which takes into account the oven mode selected and is representative of the actual centre oven temperature.
  • a small oven with a roof element assembly and base element only.
  • the roof element assembly may comprise three elements: one to be used in conjunction with the base element when operating as an oven, the other two being used when a grill is required.
  • a small oven of such a type may be considered with the oven of Figure 3 and a hob unit to provide an extremely flexible, multifunctional, cooking assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Cookers (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (7)

  1. Elektroherd, der zumindest zwei der folgenden Arten von Heizelementen umfaßt, nämlich
       ein oberes Element (9),
       seitliche Heizelemente (11),
       ein Bodenelement (10),
       ein Gebläseelement (13),
    zusammen mit einem Temperatursensor (14), Vorrichtungen zum Einstellen der Betriebsart und der Temperatur (15) sowie ein Steuerungssystem (16), und in welchem das Steuerungssystem eine Datenverarbeitungseinrichtung umfaßt, die auf Eingangssignale von den Einstellvorrichtungen und dem Temperatursensor reagiert, um die Stromversorgung der Elemente zu steuern und zu bewirken, daß der Herd in der gewünschten Betriebsart und mit der Temperatur, für die er eingestellt ist, arbeitet, wobei das Steuerungssystem einen Speicher umfaßt, der Temperaturkalibrierungsdaten für jede Betriebsart speichert, und wobei die Datenverarbeitungseinrichtung derart ausgelegt ist, daß sie aus den Sensoreingangssignalen und den gespeicherten Temperaturkalibrierungsdaten für die jeweilige Betriebsart eine korrigierte Temperatur für diese Betriebsart errechnet und die Stromversorgung der Element entsprechend steuert.
  2. Elektroherd nach Anspruch 1,
    dadurch gekennzeichnet, daß
    er eine Anzeigevorrichtung (15) zum Anzeigen der korrigierten Temperatur umfaßt.
  3. Elektroherd nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Datenverarbeitungseinrichtung ein Mikroprozessor ist.
  4. Elektroherd nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    das Steuerungssystem (16) zur Speicherung von Herdbetriebsprogrammen vorgesehen ist und die Einstellvorrichtung (15) eine Einrichtung zum Wählen eines gewünschten Programmes umfaßt.
  5. Elektroherd nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Einstellvorrichtung (15) eine Membranschalterleiste ist.
  6. Elektroherd nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    er ein oberes Element (9) mit unabhängig voneinander schaltbaren Mittel- und Außenabschnitten aufweist.
  7. Elektroherd nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Datenverarbeitungseinrichtung vorgesehen ist, um aus den Sensoreingangssignalen und den gespeicherten Temperaturkalibrierungsdaten eine korrigierte Temperatur zu errechnen, welche der Temperatur in der Ofenmitte entspricht.
EP88304289A 1987-05-12 1988-05-12 Elektroherd Expired - Lifetime EP0291302B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88304289T ATE80935T1 (de) 1987-05-12 1988-05-12 Elektroherd.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878711133A GB8711133D0 (en) 1987-05-12 1987-05-12 Cooking apparatus
GB8711133 1987-05-12

Publications (3)

Publication Number Publication Date
EP0291302A2 EP0291302A2 (de) 1988-11-17
EP0291302A3 EP0291302A3 (en) 1990-06-13
EP0291302B1 true EP0291302B1 (de) 1992-09-23

Family

ID=10617162

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88304289A Expired - Lifetime EP0291302B1 (de) 1987-05-12 1988-05-12 Elektroherd

Country Status (4)

Country Link
EP (1) EP0291302B1 (de)
AT (1) ATE80935T1 (de)
DE (1) DE3874803T2 (de)
GB (1) GB8711133D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5332886A (en) * 1991-04-11 1994-07-26 E.G.O. Elektro-Gerate Blanc U. Fischer Sensor correcting temperature regulator for electric heating apparatuses
EP0640796A2 (de) * 1993-08-23 1995-03-01 Bauknecht Hausgeräte GmbH Backofen

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4217749C2 (de) * 1992-05-29 1996-11-21 Miele & Cie Verfahren zur Steuerung der Backmuffeltemperatur
FR2759769B1 (fr) * 1997-02-17 1999-04-30 Rosieres Usines Procede de gestion du fonctionnement d'un four electrique a plusieurs modes de cuisson, et dispositif de mise en oeuvre
DE10151937A1 (de) * 2001-10-22 2003-04-30 Bsh Bosch Siemens Hausgeraete Gargerät mit einer Schnellaufheizeinheit
DE102014223267A1 (de) * 2014-11-14 2016-05-19 BSH Hausgeräte GmbH Haushalts-Wärmegerät mit Temperaturregler und Digitalanzeige
ES2673693B1 (es) * 2016-12-23 2019-04-09 Bsh Electrodomesticos Espana Sa Horno de coccion y procedimiento para el funcionamiento de un horno de coccion
ES2673743B1 (es) 2016-12-23 2019-04-09 Bsh Electrodomesticos Espana Sa Dispositivo de aparato de coccion por induccion con una unidad de ventilador y aparato de coccion con dicho dispositivo

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4380698A (en) * 1980-07-25 1983-04-19 Roper Corporation Multiprocessor control bus
JPS5883129A (ja) * 1981-11-12 1983-05-18 Matsushita Electric Ind Co Ltd 調理オ−ブン

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 179 (M-234)(1324), 9 August 1983 & JP-A-58 83129 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5332886A (en) * 1991-04-11 1994-07-26 E.G.O. Elektro-Gerate Blanc U. Fischer Sensor correcting temperature regulator for electric heating apparatuses
EP0640796A2 (de) * 1993-08-23 1995-03-01 Bauknecht Hausgeräte GmbH Backofen

Also Published As

Publication number Publication date
GB8711133D0 (en) 1987-06-17
DE3874803D1 (de) 1992-10-29
EP0291302A2 (de) 1988-11-17
ATE80935T1 (de) 1992-10-15
EP0291302A3 (en) 1990-06-13
DE3874803T2 (de) 1993-04-22

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