EP1583396A2 - Système de détection - Google Patents

Système de détection Download PDF

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Publication number
EP1583396A2
EP1583396A2 EP05102295A EP05102295A EP1583396A2 EP 1583396 A2 EP1583396 A2 EP 1583396A2 EP 05102295 A EP05102295 A EP 05102295A EP 05102295 A EP05102295 A EP 05102295A EP 1583396 A2 EP1583396 A2 EP 1583396A2
Authority
EP
European Patent Office
Prior art keywords
sensor module
radiation
heat radiation
temperature
cooking
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.)
Ceased
Application number
EP05102295A
Other languages
German (de)
English (en)
Other versions
EP1583396A3 (fr
Inventor
Uwe Has
Peter Vetterl
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 EP1583396A2 publication Critical patent/EP1583396A2/fr
Publication of EP1583396A3 publication Critical patent/EP1583396A3/fr
Ceased 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
    • 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
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a device for controlling and / or regulating the temperature the cooking zone of a cooktop, with an IR sensor module, the IR heat radiation of a Cookware or the like. Detected and generated from it signals to a control and / or Be discharged control device, wherein above the cooktop a Device is arranged, which is adapted to receive the IR-radiation to be detected.
  • Such a device is known from DE 195 37 909 A1. It concerns a sensor-controlled Cooking unit consisting of cooking appliance, sensor, electronic unit and Hob, wherein one of the sensor-controlled cooking unit associated with infrared sensor is slightly higher above the cooking surface is arranged cooking area related.
  • the infrared sensor is integrated in a constructive functional unit, which with the cooktop frame is arranged connected and retractable.
  • the functional unit also acts on a micro-switch, the electronics unit readiness of the sensor system signaled.
  • the infrared sensor Due to the close proximity between the cooking appliance and the functional unit, there is a risk that the infrared sensor heats up during use. When the infrared sensor has no uniform temperature, the accuracy of the temperature measurement of the suffers Sensor. Due to the principle, the infrared sensor can not be well insulated against heat because it has both an entrance window for infrared radiation and the Wall of the functional unit is heated.
  • the object of the present invention is therefore to provide a reliable detection of To allow temperature of the food.
  • This object is achieved by a means for transmitting the IR heat radiation solved that the absorbed heat radiation to the IR sensor module forwards.
  • the IR sensor module measures the recorded heat radiation and converts it into electrical Signals around.
  • For an effective measurement is a small distance between the surface, which emits the IR radiation, on the one hand and the IR sensor module on the other Cheap.
  • a suitable distance is approximately between 1 cm to 2 cm. So it's up to you desirable, the sensor module in the immediate vicinity of the object to be detected to arrange.
  • heating of the IR sensor module interferes with the Accuracy of its heat measurement. Heating of the sensor module is therefore too avoid.
  • An insulation of the sensor module against heat radiation is inherent however difficult, since in any case received and detected by the sensor module thermal radiation contributes to its warming. In this respect, therefore, an arrangement of the sensor module in the vicinity of the object to be measured and heat radiating disadvantageous.
  • the Invention resolves this contradiction by providing a means of transmission between the Recording the detected heat radiation and the IR sensor module provides. She pursues So the principle, the detection of thermal radiation and its conversion into electrical Separate signals from each other. This makes it possible to thermally sensitive Implementing IR heat radiation into electrical signals at one point, at the least possible thermal disturbances are expected.
  • the proposed Arrangement thus allows the IR sensor module from the absorption of heat radiation to move away and so avoid adverse heating of the sensor module. In order to is direct action of the heat energy of both the cooking pot and the hob largely excluded on the detection of heat radiation of the cooking pot.
  • an advantageous embodiment of the invention provides that the means for transmission the IR heat radiation is an optical waveguide, which corresponds to his field of application mechanical strength, vapor resistance to aggressive vapors and temperature resistance having. This allows the recorded IR radiation without a Conversion of the receiving device forwarded directly to the IR sensor module become.
  • the distance between the location of the IR heat radiation and the sensor module can be chosen so that no negative influences from the IR heat radiation of the object to be detected are to be feared on the sensor module.
  • the optical waveguide therefore along its Extension means for preventing an energy input and / or energy loss on.
  • These may e.g. consist in an enclosure of the optical waveguide, on the one hand a Energy input from outside and / or on the other hand energy loss from the optical fiber prevented by reflection on the shell.
  • the optical fiber itself be constructed in two layers and by a targeted gradient design of the layers optical refractive index are generated, which leads to a reflection of the radiation.
  • the optical waveguide is used only for signal transmission of IR radiation. So he has to do not meet the high demands of image transfer. However, must Ensure that the IR signals emitted by the device absorb the IR radiation be obtained, loss as possible at one end in the optical waveguide initiated and at the other end possible lossless to the sensor module be delivered. The lower the losses here, the lower the construction Dimensions of the device for receiving the IR radiation. Therefore, the Design of the entrance or exit surfaces of the IR radiation at the ends or interfaces the light guide with the subsequent components to special attention give. This is the more important, the greater the structural distance of the End of the optical waveguide from the IR-sensitive component of the sensor module is.
  • the optical waveguide is therefore on its interface to the device for receiving the IR radiation on the one hand and / or on the other hand formed at the interface to the IR sensor module dome-shaped. This causes a focusing of the IR radiation, which thus without scattering losses at the interface can be transferred.
  • the formation of such a dome can either by placing a lens on a smooth exit surface of the optical waveguide or done by targeted melting of the end of the optical waveguide.
  • the arrangement of a conductor between the device for receiving the IR radiation and the IR sensor module allows the sensor module from the receiving device to arrange away. This can be for the sensor module almost any location to get voted.
  • the IR sensor module therefore, within a housing of a cooker associated Herd arranged in an area below the cooktop. This is a place chosen the sensor module is mainly protected from mechanical influences and in the operation of the cooker is not a hindrance.
  • the accuracy of the measurement taken by the IR sensor module suffers by a temperature change of the IR sensor module during the measurement. Temperature influences are therefore to be kept as far as possible from the IR sensor module. It is therefore advantageous if, according to a further advantageous embodiment of the invention, the IR sensor module within the housing in a range of low temperature variation is arranged. In this way, a simple and inexpensive measure is found to operate the sensor module as possible without interference.
  • the IR sensor module measures the difference between its own temperature and the temperature the pot outer wall.
  • the own temperature and the detection of the IR heat radiation are covered by two different components. temperature influences Therefore, it has two negative effects: On the one hand leads a heating of the IR sensor module parallel to the heating of the cooking zone to lower Measurements of the temperature, as it is actually present on the pot outer wall.
  • the IR sensor module comprises an IR thermopile and a sheath that the Thermopile surrounds and is thermally insulating and / or metallic and of great thickness.
  • This can the thermopile of a thermal insulation, preferably Styropor®, and / or of surrounded by a metal shell of great thickness, e.g. taken in an aluminum block be.
  • the device for receiving IR radiation is as close as possible to the detected To arrange cooking pot. It serves to the radiation emitted by the cooking pot to pick up and couple into the ladder.
  • An advantageous embodiment of the invention provides, therefore, that the means for receiving the IR radiation, an optical Includes means for focusing the IR radiation. This makes it possible the IR radiation through a relatively large entrance window on a small inlet cross section of To direct the ladder.
  • Such an optical device preferably comprises a lens or a parabolic concave mirror. As a parabolic mirror is particularly suitable so-called "Winston Cone". In interaction with the small distance of the receiving device from the saucepan of about 1 to 2 cm and her i.a. small opening angle of about 6 ° is also detected by the optical device, the detected spot on the Cooking pot outer surface defined.
  • the optical device uses a parabolic concave mirror, which encloses a cavity
  • the cavity must be protected from pollution due to thoughtless Operation of the stove to be closed.
  • the closure of the cavity may but not to penetration losses of the IR radiation due to low transmission lead the sealing material.
  • the optical device is preceded by a closure, the at the same time serves as a filter for defining the IR wavelength range to be detected.
  • Germanium and silicon provide good transmission of IR radiation and are suitable therefore good as closure of the space formed by the concave mirror.
  • the filter function takes over then an interference layer with which the closure of germanium or silicon is covered.
  • an additional hard layer as an anti-scratch coating.
  • the exact detection of the temperature of the saucepan or the food in the pot can for an indication of the measured temperature used on a control unit of the cooker become. But you can also for a precise setting of the temperature controller of Cooking zone can be used.
  • Such control is preferred made electronically and can depend on one of a Operator of the oven selected temperature level and the detected by the IR sensor module Temperature control the heating power of the cooking zone. This allows the energy expenditure reduce the operation of the cooker.
  • the receiving device for IR radiation are on the outer surface of a cooking pot directed and therefore arranged next to and slightly above the cooking zone. With it They are in the immediate work area at the stove. There they are against mechanical effects to protect.
  • An advantageous embodiment of the invention therefore provides that the device for recording IR heat radiation in a fixed or retractable Dom is housed, which is arranged in or next to the hob. This ensures that the receiving device in normal use of the Cookers are protected against substantial damage. Is the cathedral retractable, so can be maintained with unused stove the usual impression of the hob and avoid buildups that interfere with other uses of the stove.
  • Figure 1 provides a schematic sectional view of a cooking pot 1 with an outer wall 2 and a bottom 3, on a hob 4 in a hob 5 of a cooker stands.
  • the hob 4 can be heated by a heating coil 6; she gets over it a supply line 7 supplied by an operator via an unillustrated Operating device can be controlled.
  • a dome 8 is arranged, which has an optical Device 9 includes, which is directed to the outer wall 2 of the saucepan 1.
  • the Optical device 9 is designed to detect infrared radiation and thus to detect a warming of the outer wall 2 quantitatively and forward. Therefore it is sufficient if the optical device with a small opening angle of about ⁇ 6 ° is directed to the Kochstopfau touchwand.
  • Cooking pots are usually made of stainless steel.
  • Stainless steel surfaces are known a poor IR emissivity of about 0.1 to 0.15 emotional. By coating, the emissivity of a stainless steel surface can be improved become.
  • An enamel coating for example, gives an emissivity of 0.85 to 0.9. Therefore, the area of the outer wall 2 of the saucepan 1, to which the optical device 9 is directed to carry an enamel 10. In its place can one Coating also later, for example in the form of an adhesive strip, on the Cooking pot to be applied.
  • the optical device 9 is connected via a light guide 11 with a control and / or regulating device 12 connected.
  • This device 12 can between the not shown Operating device and the heating coil 6 on the supply line 7 and thus on the Heating program of the hob 4 act, which symbolizes in Fig. 1 by a switch 13 is.
  • the heating coil 6 is over the supply line 7 is supplied with electrical energy and heated the cost 4.
  • An in the saucepan 1 food is then placed over a bottom 3 of the saucepan 1, in is in direct contact with the hob 4, heated.
  • the food is its own Heat to the outer wall 2 of the saucepan 1 from. From there it is emitted to the outside.
  • This allows the optical device 9, the heating of the outer wall. 2 receive and via the light guide 11 corresponding signals to the control and regulating device 12 forward. Because of these signals are different Control or regulatory steps completed.
  • the control and / or regulating device 12 switches off the power supply, for example or throttles the heating power as soon as the heating level is set Temperature is reached. Because the set temperature is dependent on the amount of food or condition at different times. Due to the detection of the actual temperature on the outer wall 2 can therefore at the Operator set set target temperature can be targeted. Is the Temperature of the outer wall 2 has fallen below a threshold, then the heating the cooking point 4 by the control and regulation device 12 after switching off again set in motion so that the food is kept at the desired temperature.
  • the optical device 9 can no heat radiation detect. A corresponding signal forwards this information to the control and control device 12 further, whereupon this the power supply to the cooking 4 interrupts. If a saucepan 1 is on the cooking surface 4 and is heated, receives the optical Device a heat radiation and signals this to the control and / or regulating device 12, which then sets the warming process in motion.
  • FIG. 2 shows a schematic section of FIG. 1. It shows the optical device 9, the light guide 11 connected thereto and an IR sensor module 14, the part the control and regulating device 12 in Figure 1 is.
  • the optical device 9 comprises a silicon filter 15 and a parabolic mirror 17 at its apex 18 a End of the optical fiber 11 is connected.
  • the light guide 11 connected to the IR sensor module 14.
  • the IR sensor module 14 comprises a shell 19 and a thermopile 20, which via electrical conductors 21 with the other control and / or Control device 12 is connected.
  • the optical device 9 absorbs the IR radiation through the silicon filter 15.
  • the silicon filter 15 serves as the cooking point 4 facing Completing an interior, which surrounds the parabolic mirror 17, and prevents Dirt of the mirror 17. It is additionally with a scratch-resistant surface 16 so that its permeability to IR radiation is not due to scratching reduced in the use of the stove and in particular in its cleaning becomes.
  • the mirror 17 Due to its parabolic shape, the mirror 17 focuses the IR radiation on the Optical device 9 impinges, at its apex 18. There is one end of the Optical fiber 11 is arranged so that the collimated IR radiation at the apex 18 in the light guide is coupled. From here, the IR radiation is the light guide 11th passed along into the thermopile 20. There, the thermopile 20 sets the received IR radiation in electrical signals to, via the conductors 21 in the control and / or regulating device 12 will be forwarded.
  • Thermopiles work either according to the alternating light or the constant light principle.
  • the thermopile In the alternating light principle, the thermopile is alternately exposed to IR radiation and not charged.
  • the IR radiation hits, for example, by a rotating one Perforated disk on the alternating light thermopile, which the incoming IR radiation in Relation to unirradiated state detected.
  • a rotating one Perforated disk on the alternating light thermopile which the incoming IR radiation in Relation to unirradiated state detected.
  • Simultaneous thermopiles capture an incoming IR radiation in relation to a reference temperature, usually the self-temperature.
  • thermopile 20 indicates a lower temperature difference than between Food and normal temperature is actually present.
  • the control and / or regulating device 12 therefore causes the cooking zone 4 to heat up too much or for a long time.
  • the measurement varies despite the same temperature difference.
  • the Thermopile 20 is therefore not in the cathedral 8 and thus radiating directly next to the heat Cooking pot 1 arranged, the radiation, especially during prolonged operation also heated the dome 8 and the components housed therein.
  • thermopile 20 is rather arranged at an almost arbitrary position in the hearth, at least either the temperature influence is as low as possible or sufficient space is available, to protect the thermopile 20 against temperature influences. It is with a cover 19, who can do at least one of the following two tasks: she can either keep away as temperature insulation from the thermopile 20 or insulation has a large mass, with which it unavoidable temperature effects on the Thermopile 20 slows down and stabilizes.
  • thermopile was placed immediately behind an optical device and the IR radiation received by the optical device essentially directly in coupled in the thermopile.
  • the thermopile 20 in a suitable in the above sense Place it, it must be spatially separated from the optical device 9 can. This requires a possible lossless transmission of IR radiation from the optical device 9 to the thermopile 20.
  • This possibility offers the light guide 11. He takes over at the apex 18 of the optical device. 9 recorded IR radiation and introduces them into the thermopile 20.
  • Transmission losses can occur when IR radiation from the optical fiber 11th can escape.
  • the light guide 11 surrounded by a (not shown) jacket, the IR radiation from the light guide 11 reflected when hitting the mantle.
  • prevents the coat that IR radiation is introduced from the outside into the light guide and thereby the when Thermopile 20 arriving signal is falsified.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Electric Ovens (AREA)
EP05102295A 2004-03-29 2005-03-22 Système de détection Ceased EP1583396A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004015255 2004-03-29
DE200410015255 DE102004015255A1 (de) 2004-03-29 2004-03-29 Kochsensorik

Publications (2)

Publication Number Publication Date
EP1583396A2 true EP1583396A2 (fr) 2005-10-05
EP1583396A3 EP1583396A3 (fr) 2007-08-29

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ID=34877633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05102295A Ceased EP1583396A3 (fr) 2004-03-29 2005-03-22 Système de détection

Country Status (2)

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EP (1) EP1583396A3 (fr)
DE (1) DE102004015255A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1857791A1 (fr) * 2006-05-17 2007-11-21 BSH Bosch und Siemens Hausgeräte GmbH Dispositif d'enregistrement de la température
EP1857742A3 (fr) * 2006-05-19 2008-06-04 BSH Bosch und Siemens Hausgeräte GmbH Plaque de cuisson avec un dispositif de capteur
DE102009000270A1 (de) 2009-01-16 2010-07-22 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät mit einem Lichtleiter
EP2775791A1 (fr) * 2013-03-04 2014-09-10 Miele & Cie. KG Appareil de cuisson
ES2571202A1 (es) * 2014-11-21 2016-05-24 Bsh Electrodomesticos Espana Sa Dispositivo de campo de cocción
EP2024686B1 (fr) * 2006-05-19 2016-11-30 BSH Hausgeräte GmbH Appareil ménager, de préférence plaque de cuisson

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006022324A1 (de) * 2006-05-12 2007-11-15 BSH Bosch und Siemens Hausgeräte GmbH Sensorvorrichtung
EP2813129B1 (fr) * 2012-02-10 2019-03-13 BSH Hausgeräte GmbH Table de cuisson par induction à champ de bobines d'induction
ES2423381B1 (es) * 2012-02-10 2014-09-12 Bsh Electrodomésticos España, S.A. Aparato de cocción por inducción con sensor de infrarrojos
ES2423383B1 (es) 2012-02-10 2014-09-12 Bsh Electrodomésticos España, S.A. Aparato de cocción por inducción con sensor de infrarrojos
DE102012210851B4 (de) 2012-06-26 2024-07-11 BSH Hausgeräte GmbH Induktionskochgerät mit IR-Sensor
DE102012109204A1 (de) * 2012-09-28 2014-04-03 Miele & Cie. Kg Garsystem
DE102013102109A1 (de) * 2013-03-04 2014-09-18 Miele & Cie. Kg Kocheinrichtung
DE102015212778A1 (de) 2015-07-08 2017-02-09 BSH Hausgeräte GmbH Abnehmbarer Kochsensor

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DE4331574C2 (de) * 1993-09-16 1997-07-10 Heimann Optoelectronics Gmbh Infrarot-Sensormodul
DE29803905U1 (de) * 1998-03-05 1998-04-23 Bosch-Siemens Hausgeräte GmbH, 81669 München Kochfeld mit Sensorbaugruppe zur berührlosen Temperaturmessung
ES2151805B1 (es) * 1998-03-16 2001-08-16 Santis Danilo De Sistema de control electronico de potencia para placas vitroceramicas de cocina con sensor optico de presencia de olla.
US6118105A (en) * 1999-07-19 2000-09-12 General Electric Company Monitoring and control system for monitoring the boil state of contents of a cooking utensil
US6111228A (en) * 1999-08-11 2000-08-29 General Electric Company Method and apparatus for sensing properties of glass-ceramic cooktop

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1857791A1 (fr) * 2006-05-17 2007-11-21 BSH Bosch und Siemens Hausgeräte GmbH Dispositif d'enregistrement de la température
EP1857742A3 (fr) * 2006-05-19 2008-06-04 BSH Bosch und Siemens Hausgeräte GmbH Plaque de cuisson avec un dispositif de capteur
EP2024686B1 (fr) * 2006-05-19 2016-11-30 BSH Hausgeräte GmbH Appareil ménager, de préférence plaque de cuisson
DE102009000270A1 (de) 2009-01-16 2010-07-22 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät mit einem Lichtleiter
EP2775791A1 (fr) * 2013-03-04 2014-09-10 Miele & Cie. KG Appareil de cuisson
ES2571202A1 (es) * 2014-11-21 2016-05-24 Bsh Electrodomesticos Espana Sa Dispositivo de campo de cocción

Also Published As

Publication number Publication date
DE102004015255A1 (de) 2005-10-13
EP1583396A3 (fr) 2007-08-29

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