EP0579067B1 - Appareil pour déterminer la présence et/ou la température d'un récipient pour la préparation d'aliments sur une plaque chauffante en vitro-céramique - Google Patents

Appareil pour déterminer la présence et/ou la température d'un récipient pour la préparation d'aliments sur une plaque chauffante en vitro-céramique Download PDF

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Publication number
EP0579067B1
EP0579067B1 EP93110666A EP93110666A EP0579067B1 EP 0579067 B1 EP0579067 B1 EP 0579067B1 EP 93110666 A EP93110666 A EP 93110666A EP 93110666 A EP93110666 A EP 93110666A EP 0579067 B1 EP0579067 B1 EP 0579067B1
Authority
EP
European Patent Office
Prior art keywords
container
hob
sensor
cooking
heater elements
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
EP93110666A
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German (de)
English (en)
Other versions
EP0579067A1 (fr
Inventor
Ronald Jan c/o Whirlpool Italia s.r.l. Asjes
Giovanni c/o Whirlpool Italia s.r.l. Franzetti
Franciscus C/O Whirlpool Italia S.R.L. Kokkeler
Marco c/o Whirlpool Italia s.r.l. Maritan
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.)
Whirlpool Europe BV
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Whirlpool Europe BV
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 Whirlpool Europe BV filed Critical Whirlpool Europe BV
Publication of EP0579067A1 publication Critical patent/EP0579067A1/fr
Application granted granted Critical
Publication of EP0579067B1 publication Critical patent/EP0579067B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • This invention relates to a device for determining the presence and/or the temperature of a food preparation container positioned on a glass ceramic cooking hob, this latter comprising an upper surface facing the container and heater elements, preferably of radiation type such as halogen lamps or the like, provided below the container-supporting hob plate in correspondence with a respective cooking zone.
  • a device for determining the presence and/or the temperature of a food preparation container positioned on a glass ceramic cooking hob comprising an upper surface facing the container and heater elements, preferably of radiation type such as halogen lamps or the like, provided below the container-supporting hob plate in correspondence with a respective cooking zone.
  • US-A-3 209 106 discloses a device for determining the temperature of a food preparation container positioned on a hob of a surface heater which may be of metal coated with porcelain or other heat resistant material.
  • the heat transfer member is slightly raised from the plane of the hob surface and its expansion and contraction actuates a switch to control the heating mechanism and therefore the temperature.
  • FR-A-2 669 404 discloses a heating plate or a utensil for cooking provided with bosses to reduce the surface area of contact between the hob surface and the utensil inorder to reduce the amount of conductive heating produced therebetween.
  • US-A-2 552 480 relates to an electrical heating system for controlling the heating units of cooking stoves and also for sensing the presence or absence of a cooking utensil.
  • a resistance unit is located under the cooking utensil, pushed upwards against the utensil by a spring mechanism.
  • An object of the present invention is to provide a device of the stated type by which both the presence of a saucepan on the glass ceramic hob in correspondence with the cooking zone and the temperature of said container during food preparation can be determined.
  • a further object is to provide a device of the stated type which enables the operation of each heater element to be controlled on the basis of the measured temperature of the container positioned in the cooking zone corresponding to said element.
  • a further object is to provide a device of the stated type which does not disturb the heating of the container during the preparation of the food contained in it.
  • a further object is to provide a device of the stated type which allows easy cleaning of each cooking zone on the glass ceramic hob, is of high sensing reliability, is of low cost and is easily arranged within the cooking hob.
  • a glass ceramic cooking hob is indicated overall by 1 and comprises a hob plate 2 with an upper surface 3 on which there are provided cooking zones 4 for receiving containers 5 (only one of which is shown in the figures) for food preparation.
  • Each heater element or halogen lamp 8 is connected to a power line 10 via electrical branches 11 and 12 connected to its ends 8A and 8B.
  • a power regulator 15 of known type (such as a potentiometer) is connected into one of these branches to enable the feed power to the lamp 8 to be regulated by a corresponding knob 16 positioned on the surface 3 of the hob plate 2.
  • this regulation of the power absorbed by the lamp (and consequently of the power emitted by this latter in the form of radiation) is achieved via a control unit 20 preferably of microprocessor type, to which all the knobs 16 of the cooking hob 1 are connected.
  • the unit 20 is connected to the power regulator 15.
  • each cooking zone 4 there is provided a plurality of spacer means in the form of hemispherical elements 25 arranged to support the containers 5 positioned on the cooking zones 4 and to maintain these containers raised from the surface 3.
  • each zone 4 comprises three hemispherical elements 25 arranged at the vertices of an equilateral triangle and comprising a hollow body 26 with an upper cap 27 of glass ceramic or similar material, said cap being connected in any known manner to a lower metal portion 29.
  • This latter and said cap together define a cavity 30 housing a sensor 31 (of capacitive or inductive type) able to determine the presence of the container 5 on its associated hemispherical element 25 and the container temperature during the preparation of its contained food.
  • Each hemispherical element 25 can contain one sensor 31, or alternatively a single sensor is provided for each plurality of hemispherical elements 25 associated with a corresponding cooking zone 4.
  • the portion 29 acts as a shield for the sensor 31 by shielding it from the heat generated by the lamp 8.
  • This sensor is connected to an electrical branch 33 which by passing through a hole 34 in the plate 2 connects the sensor to the unit 20.
  • the hole 34 is formed through the plate 2 at a depression 36 provided in this plate and into which the portion 29 of the hemispherical element 25 is fixed (by any known means).
  • the portion 29 can be connected to the plate 2 by one or more annular magnets 39 provided on the lower surface 40 of the plate 2 and fixed thereto in known manner.
  • the magnet or magnets act on the portion 29 of the hemispherical element 25 to retain it associated with the plate 2.
  • the connection between the unit 20 and the sensor 21 is made via an electric branch silk-screen printed on the plate 2, which is therefore not provided with a hole 34. Consequently, in this modification, the hemispherical element 25 is completely removable from the plate 2, this resulting in greater simplicity of construction and cleaning thereof. Removability of the hemispherical element 25 can however be achieved in known manner even if this element is of the type shown in the figures.
  • the sensor or sensors present in this zone feed no electrical signal to the unit 20.
  • a movable contactor 43 arranged to cooperate with fixed contacts 44 provided in the power line 10 is kept open by the unit 20.
  • the lamp 8 is therefore unable to heat the zone 4.
  • the unit 20 does not close the contactor 43 until a signal arrives from the sensor or sensors 31, even if the knob 16 corresponding to this lamp 8 is rotated (in known manner) to operate it, hence this heater element is not activated.
  • each sensor 31 When a container 5 is placed on the zone 4, each sensor 31 generates a signal U which reaches the unit 20 via the electrical branch 33. This unit therefore closes the contactor 43 across the contacts 44 to allow the lamp 8 to be powered. The heater element can then be operated in the required manner by rotating the knob 16.
  • the unit 20 acts on the regulator 15 to reduce the heating power of the lamp 8. This does not depend on said angular position of the knob 16. If the temperature falls below said value, the unit 20 senses this via the sensor 31 and acts on the regulator 15 to set the heating power of the element or lamp 8 to the value defined by the angular position of the knob 16.
  • the invention therefore enables the presence of the saucepan or container 5 on a cooking zone to be ascertained and the temperature of said saucepan (and hence by known comparison algorithms the temperature of its contained food) to be controlled.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)

Claims (16)

  1. Dispositif pour déterminer la présence et/ou la température d'un récipient (5) pour préparer des aliments, positionné sur un ensemble de cuisson en céramique vitreuse, cette dernière comportant une surface supérieure (3) faisant face au récipient (5) et des éléments chauffants (8), de préférence du type à radiation, tels que des lampes halogènes, prévus sous la plaque (2) supportant le récipient, en correspondance avec une zone de cuisson correspondante (4), caractérisé par le fait qu'il comporte une pluralité de moyens écarteurs (25) interposés entre le récipient (5) et la surface supérieure (3) de l'ensemble de cuisson (1), lesdits moyens écarteurs (25) supportant ledit récipient (5) et étant associés avec ladite plaque (1), auxdits moyens (25) étant associés des moyens détecteurs (31) capables de déterminer la présence et/ou la température dudit récipient (5). Lesdits moyens détecteurs (31) étant reliés à des moyens (20) pour commander le fonctionnement des éléments chauffants (8) qui, sur la base de la détermination faite par lesdits détecteurs (31), agissent sur lesdits éléments chauffants (8) pour réguler leur fonctionnement.
  2. Dispositif comme revendiqué dans la revendication 1, caractérisé par le fait que les moyens écarteurs sont des éléments (25) présentant un corps (26) auquel les moyens détecteurs (31) sont associés, ledit corps (26) comportant une portion (29) qui fait face à la surface supérieure (3) de l'ensemble de cuisson et qui est disposée pour faire écran pour lesdits moyens (31) à l'égard de la chaleur générée par les éléments chauffants (8).
  3. Dispositif comme revendiqué dans la revendication 2, caractérisé par le fait que le corps (26) des moyens écarteurs présente une partie creuse (30) et contient les moyens détecteurs (31) dans cette partie creuse (30).
  4. Dispositif comme revendiqué dans la revendication 3, caractérisé par le fait que le corps (26) des moyens écarteurs (25) a une forme hémisphérique et comporte une partie sphérique ou calotte (27) située à la partie supérieure et conçue pour coopérer avec le récipient (5) pour aliments, ladite partie (27) étant reliée, de façon connue à la portion (29), formant écran, qui fait face à la surface (3) de l'ensemble de cuisson.
  5. Dispositif comme revendiqué dans la revendication 1, caractérisé par le fait que les moyens écarteurs (25) sont associés, de façon amovible, avec l'ensemble de cuisson (1).
  6. Dispositif comme revendiqué dans la revendication 5, caractérisé par le fait qu'il comporte une liaison magnétique entre les moyens écarteurs (25) et l'ensemble de cuisson.
  7. Dispositif comme revendiqué dans la revendication 5, caractérisé par le fait qu'il comporte des liaisons électriques imprimées par sérigraphie prévues sur la plaque de cuisson 2 de l'ensemble de cuisson pour coopérer avec les moyens détecteurs (31) pour relier ces derniers aux moyens de commande (20).
  8. Dispositif comme revendiqué dans la revendication 1 ou 7, caractérisé par le fait que les moyens de commande sont un organe de commande (20), de préférence du type microprocesseur.
  9. Dispositif comme revendiqué dans la revendication 8, caractérisé par le fait que l'organe de commande (20) commande l'ouverture et la fermeture d'un contacteur mobile (43) en reliant ensemble des contacts fixes (44) prévus sur la ligne puissance (10) alimentant les éléments chauffants.
  10. Dispositif comme revendiqué dans la revendication 8, caractérisé par le fait que l'organe de commande (20) agit sur un régulateur de puissance habituel (15) pour les éléments chauffants (8).
  11. Dispositif comme revendiqué dans la revendication 8, caractérisé par le fait que l'organe de commande (20) est relié à un ou plusieurs boutons pour faire fonctionner les éléments chauffants (8).
  12. Dispositif comme revendiqué dans la revendication 1, caractérisé par le fait que les moyens détecteurs (31) sont un détecteur capacitif.
  13. Dispositif comme revendiqué dans la revendication 1, caractérisé par le fait que les moyens détecteurs (31) sont un détecteur inductif.
  14. Dispositif comme revendiqué dans la revendication 1, caractérisé par le fait que les moyens détecteurs (31) sont associés à une pluralité de moyens écarteurs (25).
  15. Dispositif comme revendiqué dans la revendication 1, caractérisé par le fait que les moyens détecteurs (31) sont associés à un seul de la pluralité de moyens écarteurs prévus pour chaque zone de cuisson (4).
  16. Dispositif comme revendiqué dans la revendication 1, caractérisé par le fait que les moyens écarteurs sont disposés aux sommets d'un triangle équilatéral en correspondance avec une zone de cuisson respective.
EP93110666A 1992-07-13 1993-07-05 Appareil pour déterminer la présence et/ou la température d'un récipient pour la préparation d'aliments sur une plaque chauffante en vitro-céramique Expired - Lifetime EP0579067B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI921692A IT1255337B (it) 1992-07-13 1992-07-13 Dispositivo per rilevare la presenza e/o la temperatura di un contenitore per la preparazione di alimenti posto su un piano di cottura in vetroceramica
ITMI921692 1992-07-13

Publications (2)

Publication Number Publication Date
EP0579067A1 EP0579067A1 (fr) 1994-01-19
EP0579067B1 true EP0579067B1 (fr) 1998-01-07

Family

ID=11363657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110666A Expired - Lifetime EP0579067B1 (fr) 1992-07-13 1993-07-05 Appareil pour déterminer la présence et/ou la température d'un récipient pour la préparation d'aliments sur une plaque chauffante en vitro-céramique

Country Status (3)

Country Link
EP (1) EP0579067B1 (fr)
DE (1) DE69316094T2 (fr)
IT (1) IT1255337B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2356442A1 (es) * 2009-01-13 2011-04-08 Bsh Electrodomesticos España, S.A Campo de cocción con una placa de cubierta.
WO2022058226A2 (fr) 2020-09-18 2022-03-24 BSH Hausgeräte GmbH Système de cuisson

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2361106B1 (es) * 2009-04-17 2012-04-20 Bsh Electrodomesticos España S.A Placa de cubierta para un campo de cocción.
ES2684174B1 (es) * 2017-03-30 2019-07-04 Bsh Electrodomesticos Espana Sa Dispositivo de campo de cocción con una unidad de apoyo y sistema de cocción con el dispositivo

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552480A (en) * 1945-10-29 1951-05-08 Bendix Aviat Corp Electrical heating system
US3209106A (en) * 1961-02-24 1965-09-28 Pace Inc Thermoresponsive switch for electrically energizable surface heater
FR2669404A1 (fr) * 1990-11-16 1992-05-22 Philips Atoires Electronique Table chauffante et ustensile munis de moyens respectifs controlant selectivement leurs echanges thermiques.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2356442A1 (es) * 2009-01-13 2011-04-08 Bsh Electrodomesticos España, S.A Campo de cocción con una placa de cubierta.
WO2022058226A2 (fr) 2020-09-18 2022-03-24 BSH Hausgeräte GmbH Système de cuisson

Also Published As

Publication number Publication date
ITMI921692A0 (it) 1992-07-13
ITMI921692A1 (it) 1994-01-13
EP0579067A1 (fr) 1994-01-19
DE69316094D1 (de) 1998-02-12
IT1255337B (it) 1995-10-31
DE69316094T2 (de) 1998-06-10

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