EP2703727A1 - Dispositif d'appareil ménager - Google Patents

Dispositif d'appareil ménager Download PDF

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Publication number
EP2703727A1
EP2703727A1 EP13181763.7A EP13181763A EP2703727A1 EP 2703727 A1 EP2703727 A1 EP 2703727A1 EP 13181763 A EP13181763 A EP 13181763A EP 2703727 A1 EP2703727 A1 EP 2703727A1
Authority
EP
European Patent Office
Prior art keywords
light
unit
light guide
domestic appliance
sensor
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.)
Withdrawn
Application number
EP13181763.7A
Other languages
German (de)
English (en)
Inventor
Rafael Alonso Esteban
Carlos Heras Vila
Eduardo Imaz Martinez
Sergio Llorente Gil
David Paesa García
Julio Rivera Peman
Iñigo SALINAS ARIZ
Francisco Villuendas Yuste
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2703727A1 publication Critical patent/EP2703727A1/fr
Withdrawn legal-status Critical Current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
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/083—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on tops, hot plates
    • 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
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/105—Constructive details concerning the regulation of the temperature

Definitions

  • the invention relates to a household appliance device according to the preamble of claim 1.
  • Hobs which have infrared sensors for the determination of temperature, which receive light via a glass fiber.
  • the glass fiber is arranged directly on a hob plate.
  • the object of the invention is in particular to provide a generic device with improved properties in terms of a good measurement result.
  • the object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.
  • the invention is based on a domestic appliance device, in particular a cooktop device, with at least one sensor unit which has at least two light sensor modules and at least two light guide units, which are intended to guide light from a measuring point on a measuring surface to the respective light sensor module.
  • a “sensor unit” should be understood in particular to mean a unit which has at least one sensor element and / or at least one sensor module.
  • a “sensor element” is to be understood in particular as a preferably electronic element which is intended to be a physical variable, in particular a temperature and / or an electromagnetic radiation, into an evaluable, preferably electrical, parameter, in particular a resistor, a current intensity , a voltage, an inductance and / or the like, to convert.
  • a “sensor module” is to be understood in particular as a module which has at least one sensor element.
  • the sensor elements of a sensor module are provided to a single input, in particular a light beam to analyze.
  • the sensor elements of a sensor module are intended to be used together to determine a single variable, in particular a temperature.
  • the sensor unit has at least one electronics, in particular at least one amplifier unit, for amplifying electrical signals, and / or at least one evaluation electronics.
  • a “light sensor module” is to be understood, in particular, as a sensor module which has at least one light sensor.
  • a “light sensor” is to be understood in particular as meaning a sensor element which is intended to emit electromagnetic radiation, in particular at least in the infrared spectral range, in particular at least in the range between 1 ⁇ m and 5 ⁇ m, advantageously between 1.2 ⁇ m and 3 ⁇ m, preferably between 1.7 microns and 2.6 microns, to detect and in particular to convert at least one electrical signal.
  • a "light guide unit” is to be understood in particular as a unit which is intended to guide light, in particular at least in the infrared spectral range, from a first point to a second point.
  • the first and the second point are at least 5 cm, advantageously at least 10 cm, preferably at least 15 cm away from each other.
  • the light guide unit is provided to adapt a propagation direction of the light.
  • at least one point of the light guide unit is a propagation direction of the light, relative to an inlet direction by at least 10 °, advantageously at least 30 °, preferably at least 80 ° rotated.
  • the light guide unit has at least one reflecting and / or focusing element, in particular a mirror, a prism and / or a lens.
  • the light guide unit is provided to capture light from the measurement point and forward.
  • a “measuring point” is to be understood as meaning, in particular, a region of the measuring surface which in particular has an area of at least 0.05 mm 2 , advantageously at least 0.2 mm 2 , preferably at least 0.75 mm 2 .
  • the measuring point is formed by a surface piece of a, preferably at least partially transparent, heating zone delimiting unit, in particular a hob plate, alternatively a cooking chamber wall.
  • the measuring surface is intended to light, in particular at least in the infrared spectral range, at least at the measuring point at least partially, in particular at least in the range between 1.2 microns and 2.6 microns to at least 30%, in particular at least 50%, advantageously at least 80%, to transmit.
  • the heating zone limiting unit is formed by an at least glass-like material, in particular glass ceramic and / or borosilicate glass.
  • the heating zone delimiting unit has at least one, in particular coloring, coating, which is arranged in particular on a rear side.
  • the heating zone limiting unit is provided for at least a partial area, in particular at least 30%, advantageously at least 50%, preferably at least 80%, of the spectral range of visible light at least 40%, in particular at least 60%, advantageously at least 75%, preferably at least 90 %, to absorb.
  • the sensor unit is provided to determine a temperature of a arranged in the heating zone cooking utensils and / or food.
  • the measuring surface is formed by a side of the heating zone limiting unit facing away from the heating zone, in particular an outer side or a lower side.
  • the invention can be used particularly advantageously.
  • a temperature of a cooking utensil can be determined in a safe manner.
  • the term "to be guided in each case in a different spectral range” should be understood in particular to mean that the radiation emanating from the respective measuring point is coupled into the respective light guiding unit in a prescribable spectral range and guided by the latter.
  • the specifiable spectral ranges for the at least two light guide units differ. For example, in a first light guide unit, the radiation in the range of 1.7 ⁇ m and in a second light guide unit the radiation in the range of 2.6 ⁇ m are injected.
  • At least one filter unit is arranged optically between the measuring surface and the light guide unit.
  • a “filter unit” is to be understood in particular as meaning a unit which has at least one filter element.
  • a “filter element” is to be understood as meaning, in particular, an element which is intended to be at least a part of a spectrum of electromagnetic Absorb radiation.
  • the filter element is designed as a high-pass filter and is intended to absorb electromagnetic radiation whose wavelength is smaller than a cut-off wavelength.
  • an embodiment of the filter element as a low-pass filter or as a bandpass filter is conceivable.
  • the filter unit is intended to absorb at least visible light, in particular at least light having a wavelength of less than 800 nm, in particular less than 1000 nm, advantageously less than 1.2 ⁇ m.
  • the filter unit is formed by at least one coating on the heating zone delimiting unit. It can be avoided in particular that the light guide unit heats up unnecessarily by absorption of visible light. In particular, a space-saving design can be achieved. In particular, a measured value corruption can be avoided.
  • the light guide unit is formed by at least one optical fiber.
  • An "optical fiber” is to be understood, in particular, as a light-conducting element which is designed as a fiber and is intended to achieve lateral light confinement on the basis of total reflection.
  • a fiber is to be understood in particular as meaning a preferably flexible element which has a thickness which corresponds to a maximum of 20%, in particular not more than 10%, advantageously not more than 5%, preferably not more than 1%, of a length of the element.
  • the fiber has an at least oval, preferably circular, cross-section.
  • the glass fiber has a smallest bending radius of not more than 5 cm, in particular not more than 4 cm, advantageously not more than 3 cm.
  • the optical fiber is formed by glass.
  • the optical fiber preferably has a greater refractive index in the center than in at least one edge area.
  • the refractive index, starting from the center towards the edge, is subject to a falling gradient.
  • the optical fiber has a core fiber with a diameter of at least 200 ⁇ m, in particular at least 300 ⁇ m, advantageously at least 500 ⁇ m.
  • the optical fiber has a numerical aperture of at least 0.1, advantageously at least 0.2, and in particular of at most 0.5, advantageously of at most 0.3.
  • a low-loss light guide can be achieved.
  • a flexible positioning of the light sensor module can be achieved.
  • the home appliance device has at least one evaluation electronics which is provided, in at least one operating mode, to determine a temperature from the signals of the at least two light sensor modules.
  • the transmitter has at least one arithmetic unit, advantageously at least one memory unit and an operating program stored in the memory unit, which is intended to be executed by the arithmetic unit.
  • the transmitter has at least one amplifier circuit.
  • the evaluation is provided to convert the parameter into a evaluable for a control unit, advantageously digital signal.
  • the evaluation electronics are provided to use at least a sum of the signals of the at least two light sensor modules for determining the temperature. In particular, a good temperature determination can be achieved.
  • the evaluation electronics be provided to determine the temperature at least from a ratio of the signals of the at least two light sensor modules. In particular, a good temperature determination can be achieved.
  • the invention is preferably used in cooking appliances, in particular stoves and / or hobs. But in other household appliances in which a non-contact temperature determination is sought, this invention is advantageously used.
  • FIG. 1 shows a cooking appliance designed as a domestic appliance 10 with four, each as a hob device, trained home appliance devices 12.
  • the domestic appliance 10 is formed as an induction hob.
  • the domestic appliance devices 12 each have a heating element 14, which is arranged below a heating zone limiting unit 16.
  • the heating elements 14 are designed as induction heating elements.
  • the heating zone limiting unit 16 is designed as a cooktop panel formed by glass ceramic.
  • FIG. 2 shows a home appliance device 12.
  • the home appliance device 12 has a sensor unit 20 with two light sensor modules 22, 23. Furthermore, the sensor unit 20 has two light guide units 24, 25.
  • the light guide units 24, 25 are guided through a recess 36 in the heating element 14.
  • the recess 36 is disposed near a center of the heating element 14.
  • the light guide units 24, 25 are provided to guide light from two closely spaced measuring points 26, 27 from a measuring surface 28 to one of the light sensor modules 22, 23.
  • the light guide units 24, 25 are guided in a region near the measuring point 26 and in the recess 36 perpendicular to the heating zone delimiting unit 16. Under the heating element 14, the light guide units 24, 25 pass over with a bending radius of 3 cm into a horizontal course parallel to the heating zone delimiting unit 16.
  • the light sensor modules 22, 23 each have a light sensor designed as an infrared photodiode.
  • the light guide units 24, 25 are spaced apart from the measurement surface 28.
  • the measuring surface 28 is formed by an underside of the heating zone delimiting unit 16.
  • the heating zone limiting unit 16 is designed as a light-guiding element. A distance 38 between the light guide units 24, 25 and the measuring surface 28 is 2 mm.
  • a filter unit 30, 31 is arranged in each case.
  • the filter units 30, 31 are intended to filter different spectral ranges.
  • the filter units 30, 31 divide the spectral range between 1.2 ⁇ m and 2.6 ⁇ m to different ones of the light guide units 24, 25. For example, a spectral range of 1.7 ⁇ m is coupled into a first light guide unit 24 via a first filter unit 30, and a spectral range of 2.6 ⁇ m is coupled into a second light guide unit 25 via a second filter unit 31.
  • the sensor unit 20 is provided from the Measured values and in particular a ratio of the measured values of the two light sensor modules 22, 23 to determine a temperature of a cooking utensil 34 set up on the heating zone delimiting unit 16.
  • the light guide units 24, 25 are essentially each formed by an optical fiber 32, 33 formed as a glass fiber.
  • the optical fibers 32, 33 have a core diameter of 1 mm.
  • the optical fibers 32, 33 have a numerical aperture of 0.22.
  • the filter units 30, 31 are part of the light guide units 24, 25 and are attached to the optical fibers 32, 33.
  • the sensor unit 20 has an evaluation unit 40, which is provided to determine a temperature from the signals of the two light sensor modules 22, 23.
  • the evaluation electronics 40 is provided to use a sum of the signals for a temperature determination. In order to carry out an improved temperature determination, the evaluation unit 40 determines a ratio of the signals of the two light sensor modules 22, 23.
  • the evaluation electronics 40 determines a ratio of the voltage measurement values from simultaneously recorded voltage measurement values of the two light sensor modules 22, 23. A determined ratio of the signals is assigned to a temperature via a calibration table or a calibration curve.
  • K is a constant which depends on the sensor and the signal amplifier of the light sensor module.
  • E is the emissivity / emissivity of the cookware.
  • T is the cooking utensil temperature.
  • R (WL) is a function of the wavelength of the light (WF), which is specific to the sensor used.
  • the emissivity and the Gargeschirrtemperatur can be determined.
  • the light guide units 24, 25 are intended to receive light emitted by a cooking utensil 34 arranged on the heating zone delimiting unit 16 and transmitted by the heating zone delimiting unit 16.
  • the sensor unit 20 is provided to determine a temperature of the cooking utensil 34.

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)
  • Induction Heating Cooking Devices (AREA)
  • Radiation Pyrometers (AREA)
EP13181763.7A 2012-09-03 2013-08-27 Dispositif d'appareil ménager Withdrawn EP2703727A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201231361 2012-09-03

Publications (1)

Publication Number Publication Date
EP2703727A1 true EP2703727A1 (fr) 2014-03-05

Family

ID=49033945

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13181763.7A Withdrawn EP2703727A1 (fr) 2012-09-03 2013-08-27 Dispositif d'appareil ménager

Country Status (1)

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EP (1) EP2703727A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2925086A1 (fr) * 2014-03-24 2015-09-30 BSH Hausgeräte GmbH Dispositif de plaque de cuisson

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2190260A1 (fr) * 2007-08-13 2010-05-26 Panasonic Corporation Cuiseur à chauffage par induction
DE102009000270A1 (de) * 2009-01-16 2010-07-22 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät mit einem Lichtleiter
JP2011138734A (ja) * 2010-01-04 2011-07-14 Mitsubishi Electric Corp 誘導加熱調理器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2190260A1 (fr) * 2007-08-13 2010-05-26 Panasonic Corporation Cuiseur à chauffage par induction
DE102009000270A1 (de) * 2009-01-16 2010-07-22 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät mit einem Lichtleiter
JP2011138734A (ja) * 2010-01-04 2011-07-14 Mitsubishi Electric Corp 誘導加熱調理器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2925086A1 (fr) * 2014-03-24 2015-09-30 BSH Hausgeräte GmbH Dispositif de plaque de cuisson

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