EP1311841A1 - Heating device, in particular for a sensor element for the analysis of gases - Google Patents

Heating device, in particular for a sensor element for the analysis of gases

Info

Publication number
EP1311841A1
EP1311841A1 EP01969226A EP01969226A EP1311841A1 EP 1311841 A1 EP1311841 A1 EP 1311841A1 EP 01969226 A EP01969226 A EP 01969226A EP 01969226 A EP01969226 A EP 01969226A EP 1311841 A1 EP1311841 A1 EP 1311841A1
Authority
EP
European Patent Office
Prior art keywords
heating device
heating
conductor
heat
platinum
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Withdrawn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
EP01969226A
Other languages
German (de)
French (fr)
Inventor
Hans-Georg Renz
Lothar Diehl
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1311841A1 publication Critical patent/EP1311841A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/4067—Means for heating or controlling the temperature of the solid electrolyte
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H05B3/265—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base the insulating base being an inorganic material, e.g. ceramic
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material

Definitions

  • Heating device in particular for a sensor element for analyzing gases
  • the invention relates to a heating device, in particular for a sensor element for analyzing exhaust gases from internal combustion engines, according to the preamble of the main claim.
  • the object of the present invention was to improve known heating devices, such as those used in gas sensors, in terms of shortening the heating-up time and giving off heat as uniformly as possible.
  • the heating device according to the invention has the advantage over the prior art that a significantly more uniform heat emission from the heating device to electrodes or electrolyte layers located above it is achieved. Furthermore, the heating device according to the invention results in a significantly shorter heating-up time due to an improved heat transfer or an improved heat dissipation to adjacent layers. Finally, the equalization of the heat radiation also leads to a reduction in the risk of cracks, for example in a gas sensor with such a heating device.
  • the explained advantages of the heating device according to the invention are based to a large extent on the utilization of the so-called black heater effect, i.e. the arrangement of additional heat-conducting elements, for example metal surfaces, in the vicinity of the heating conductors, which are electrically insulated from them, but are connected to the heating conductors in a heat-conducting manner, and which thus give off a uniform and rapid heat dissipation to the entire, with the heat radiation Surface provided heater or adjacent surfaces.
  • the total available radiation area of the heating device is also increased by the heat-conducting elements provided.
  • the heat conductors provided are metal surfaces which consist of the same material as the meandering heat conductors and are in particular in the form of platinum surfaces. It is also advantageous if as many metal surfaces as possible distributed between the meandering structures of the heating conductor are provided, but it must always be ensured that that there are no short circuits between the heating conductors and the additional metal surfaces attached in their vicinity.
  • FIG. 1 shows a heating device known from the prior art, as used in gas sensors
  • FIG. 2 shows a heating device modified according to the invention.
  • the illustrated embodiment is based on a gas. sensor (“ ⁇ probe”) with a plurality of ceramic layers and at least one measuring electrode exposed to a gas to be analyzed and at least one reference electrode, as has already been proposed, for example, in application DE 199 06 908 AI.
  • platinum conductor tracks as heating conductors on a flat zirconium dioxide substrate, ⁇ which are meandering in the hot area of the gas sensor.
  • a further insulation layer for example made of aluminum oxide, is then located on the substrate with the heating conductors.
  • the heating conductors running on the substrate by printing on a platinum-containing paste and then sintering to platinum, so that flat platinum conductor tracks are formed which are meandering in the hot area of the sensor.
  • FIG. 1 shows such a heating device known from the prior art, with flat platinum conductor tracks as heating conductors on a substrate 10 made of zirconium dioxide 11 have been generated. These heating conductors 11 also have a meandering structure in some areas and are finally incorporated into the insulation layer (not shown).
  • FIG. 2 shows a modification of FIG. 1, additional metal surfaces 12 electrically insulated from the heat conductor 11 being arranged between the meandering structures of the heat conductor 11.
  • these metal surfaces 12 likewise consist of platinum and were produced at the same time as the heating conductors 11 were printed on the substrate 10.
  • FIG. 2 it is further shown that a plurality of such metal surfaces 12 are preferably provided, these metal surfaces 12 always being arranged in such a way that there are no short circuits between the individual meanders of the heating conductor 11.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Molecular Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

A heating device, in particular for a sensor element for the analysis of exhaust gases from internal combustion engines, is disclosed. Said heating device comprises a heating conductor (11) running on a substrate (10), in particular in a convoluted form and at least one thermally conducting element (12), electrically insulated from the heating conductor (11) and arranged in the vicinity of the heating conductor (11).

Description

Heizeinrichtung, insbesondere für ein Sensorelement zur Analyse von Gasen Heating device, in particular for a sensor element for analyzing gases
Die Erfindung betrifft eine Heizeinrichtung, insbesondere für ein Sensorelement zur Analyse von Abgasen von Verbrennungsmotoren, nach der Gattung des Hauptanspruches.The invention relates to a heating device, in particular for a sensor element for analyzing exhaust gases from internal combustion engines, according to the preamble of the main claim.
Stand der TechnikState of the art
Bei der Herstellung von planaren Gassensoren („La bda- ' Sonden") ist bekannt, diese mit Hilfe einer in einen mehrlagigen, keramischen Schichtaufbau eingebundenen Heizeinrich- tung zu beheizen. So ist in der Anmeldung DE 199 06 908 AI bereits beschrieben worden, eine Heizeinrichtung zwischen zwei keramischen Schichten in Form von Platinleiterbahnen auszuführen, die im heißen Bereich des Gassensors, d.h. in dem Bereich, in dem sich auch die Mess- und Referenzelektro- de befindet, und der dem zu analysierenden Gas ausgesetzt ist, mäanderförmig auszubilden.In the production of planar gas sensors (“La bda” probes), it is known to heat them with the aid of a heating device integrated in a multilayer, ceramic layer structure. For example, DE 199 06 908 A1 has already described one To execute the heating device between two ceramic layers in the form of platinum conductor tracks, which in the hot area of the gas sensor, ie in the area in which the measuring and reference electrode is also located and which is exposed to the gas to be analyzed, are formed in a meandering shape.
Aufgabe der vorliegenden Erfindung war die Verbesserung bekannter Heizeinrichtungen, wie sie beispielsweise in Gassen- soren eingesetzt werden, hinsichtlich einer Verkürzung der Aufheizzeit und einer möglichst gleichmäßigen Wärmeabgabe.The object of the present invention was to improve known heating devices, such as those used in gas sensors, in terms of shortening the heating-up time and giving off heat as uniformly as possible.
Vorteile der Erfindung Die erfindungsgemäße Heizeinrichtung hat gegenüber dem Stand der Technik den Vorteil, dass eine deutlich gleichmäßigere Wärmeabgabe von der Heizeinrichtung an darüber befindliche Elektroden bzw. Elektrolytschichten erreicht wird. Weiter ergibt sich durch die erfindungsgemäße Heizeinrichtung eine deutliche verkürzte Aufheizzeit durch einen verbesserten Wärmeübertrag bzw. eine verbesserte Wärmeabgabe an benachbarte Schichten. Schließlich führt die erreichte Vergleichmäßigung der Wärmeabstrahlung auch zu einer Verringerung der Gefahr von Rissbildungen, beispielsweise in einem Gassensor mit einer derartigen Heizeinrichtung.Advantages of the invention The heating device according to the invention has the advantage over the prior art that a significantly more uniform heat emission from the heating device to electrodes or electrolyte layers located above it is achieved. Furthermore, the heating device according to the invention results in a significantly shorter heating-up time due to an improved heat transfer or an improved heat dissipation to adjacent layers. Finally, the equalization of the heat radiation also leads to a reduction in the risk of cracks, for example in a gas sensor with such a heating device.
Die erläuterten Vorteile der erfindungsgemäßen Heizeinrichtung beruhen zu einem wesentlichen Teil auf der Ausnutzung des sogenannten Schwarzstrahlereffektes, d.h. der Anordnung von zusätzlichen Wärmeleitelementen, beispielsweise Metallflächen, in der Umgebung der Heizleiter, die zwar von diesen elektrisch isoliert sind, mit den Heizleitern aber wärmeleitend in Verbindung stehen, und die damit durch Wärmeabstrah- lung eine gleichmäßige und schnelle Wärmeabgabe an die gesamte, mit der Heizeinrichtung versehene Oberfläche oder benachbarte Flächen bewirken. Im Übrigen wird durch die vorgesehenen Wärmeleitelemente auch die insgesamt zur Verfügung stehende Abstrahlfläche der Heizeinrichtung vergrößert.The explained advantages of the heating device according to the invention are based to a large extent on the utilization of the so-called black heater effect, i.e. the arrangement of additional heat-conducting elements, for example metal surfaces, in the vicinity of the heating conductors, which are electrically insulated from them, but are connected to the heating conductors in a heat-conducting manner, and which thus give off a uniform and rapid heat dissipation to the entire, with the heat radiation Surface provided heater or adjacent surfaces. In addition, the total available radiation area of the heating device is also increased by the heat-conducting elements provided.
Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den in den Unteransprüchen genannten Maßnahmen.Advantageous developments of the invention result from the measures mentioned in the subclaims.
So ist besonders vorteilhaft, wenn die vorgesehenen Wär e- leitele ente Metallflächen sind, die aus dem gleichen Material wie die mäanderförmig verlaufenden Heizleiter bestehen, und insbesondere in Form von Platinflächen ausgebildet ist. Weiter ist vorteilhaft, wenn möglichst viele, zwischen den Mäanderstrukturen des Heizleiters verteilte Metallflächen vorgesehen sind, wobei jedoch stets gewährleistet sein muss, dass es nicht zu Kurzschlüssen zwischen den Heizleitern und den in deren Umgebung angebrachten zusätzlichen Metallflächen kommt .It is particularly advantageous if the heat conductors provided are metal surfaces which consist of the same material as the meandering heat conductors and are in particular in the form of platinum surfaces. It is also advantageous if as many metal surfaces as possible distributed between the meandering structures of the heating conductor are provided, but it must always be ensured that that there are no short circuits between the heating conductors and the additional metal surfaces attached in their vicinity.
Zeichnungendrawings
Die Erfindung wird anhand der Zeichnungen und in der nachfolgenden Beschreibung näher erläutert. Die Figur 1 zeigt eine aus dem Stand der Technik bekannte Heizeinrichtung, wie sie in Gassensoren eingesetzt wird, die Figur 2 zeigt eine erfindungsgemäß modifizierte Heizeinrichtung.The invention is explained in more detail with reference to the drawings and in the description below. FIG. 1 shows a heating device known from the prior art, as used in gas sensors, FIG. 2 shows a heating device modified according to the invention.
Ausführungsbeispieleembodiments
Das erläuterte Ausführungsbeispiel geht aus von einem Gas- . sensor („λ-Sonde") mit einer Mehrzahl von keramischen Schichten und mindestens einer einem zu analysierenden Gas ausgesetzten Messelektrode sowie mindestens einer Referenzelektrode, wie er beispielsweise in der Anmeldung DE 199 06 908 AI bereits vorgeschlagen worden ist.The illustrated embodiment is based on a gas. sensor (“λ probe”) with a plurality of ceramic layers and at least one measuring electrode exposed to a gas to be analyzed and at least one reference electrode, as has already been proposed, for example, in application DE 199 06 908 AI.
Daraus ist weiter bekannt, auf einem flächigen Zirkoniumdioxidsubstrat Platinleiterbahnen als Heizleiter zu erzeugen, ■ die in dem heißen Bereich des Gassensors mäanderförmig aus- gebildet sind. Auf dem Substrat mit den Heizleitern befindet sich dann eine weitere Isolationsschicht, beispielsweise aus Aluminiumoxid. Schließlich ist daraus bekannt, die auf dem Substrat verlaufenden Heizleiter durch Aufdrucken einer pla- tinhaltigen Paste und anschließendes Sintern zu Platin zu erzeugen, so dass flächige, im heißen Bereich des Sensors mäanderförmig ausgebildete Platinleiterbahnen entstehen.It is also known from this to produce platinum conductor tracks as heating conductors on a flat zirconium dioxide substrate, ■ which are meandering in the hot area of the gas sensor. A further insulation layer, for example made of aluminum oxide, is then located on the substrate with the heating conductors. Finally, it is known from this to produce the heating conductors running on the substrate by printing on a platinum-containing paste and then sintering to platinum, so that flat platinum conductor tracks are formed which are meandering in the hot area of the sensor.
Die Figur 1 zeigt eine derartige, aus dem Stand der Technik bekannte Heizeinrichtung, wobei auf einem Substrat 10 aus Zirkoniumdioxid flächige Platinleiterbahnen als Heizleiter 11 erzeugt worden sind. Diese Heizleiter 11 weisen weiter bereichsweise eine mäanderförmige Struktur auf und werden schließlich in die nicht dargestellte Isolationsschicht eingebunden.FIG. 1 shows such a heating device known from the prior art, with flat platinum conductor tracks as heating conductors on a substrate 10 made of zirconium dioxide 11 have been generated. These heating conductors 11 also have a meandering structure in some areas and are finally incorporated into the insulation layer (not shown).
Die Figur 2 zeigt als Ausführungsbeispiel der Erfindung eine Modifikation von Figur 1, wobei zwischen den mäanderförmigen Strukturen der Heizleiter 11 zusätzliche, von dem Heizleiter 11 elektrisch isolierte Metallflächen 12 angeordnet worden sind. Diese Metallflächen 12 bestehen im erläuterten Beispiel ebenfalls aus Platin und sind gleichzeitig mit dem Aufdrucken der Heizleiter 11 auf das Substrat 10 erzeugt worden. Gemäß Figur 2 ist weiter dargestellt, dass bevorzugt eine Vielzahl von derartigen Metallflächen 12 vorgesehen sind, wobei diese Metallflächen 12 stets so angeordnet sind, dass es nicht zu Kurzschlüssen zwischen den einzelnen Mäandern des Heizleiters 11 kommt.As an exemplary embodiment of the invention, FIG. 2 shows a modification of FIG. 1, additional metal surfaces 12 electrically insulated from the heat conductor 11 being arranged between the meandering structures of the heat conductor 11. In the example explained, these metal surfaces 12 likewise consist of platinum and were produced at the same time as the heating conductors 11 were printed on the substrate 10. According to FIG. 2, it is further shown that a plurality of such metal surfaces 12 are preferably provided, these metal surfaces 12 always being arranged in such a way that there are no short circuits between the individual meanders of the heating conductor 11.
Hinsichtlich weiterer, an sich bekannter Details der Hei- zeinrichtung gemäß Figur 1 oder Figur 2 sowie des damit hergestellten Gassensors sei auf die Anmeldung DE 199 06 908 AI verwiesen. With regard to further, known details of the heating device according to FIG. 1 or 2 and the gas sensor produced therewith, reference is made to the application DE 199 06 908 AI.

Claims

Ansprüche Expectations
1. Heizeinrichtung, insbesondere für ein Sensorelement zur Analyse von Abgasen von Verbrennungsmotoren, mit einem auf einem Substrat (10) verlaufenden Heizleiter (11) , dadurch gekennzeichnet, dass in einer Umgebung des Heizleiters (11) mindestens ein von dem Heizleiter (11) elektrisch isoliertes Wärmeleitelement (12) angeordnet ist.1. Heating device, in particular for a sensor element for analyzing exhaust gases from internal combustion engines, with a heating conductor (11) running on a substrate (10), characterized in that in an environment of the heating conductor (11) at least one of the heating conductors (11) is electrical insulated heat-conducting element (12) is arranged.
2. Heizeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Wärmeleitelement (12) als eine Metallfläche ausgebildet ist.2. Heating device according to claim 1, characterized in that the heat-conducting element (12) is designed as a metal surface.
3. Heizeinrichtung nach Anspruch 2, dadurch gekennzeichnet, dass eine Mehrzahl von Metallflächen vorgesehen sind, die einer Umgebung eines mäanderförmig ausgebildeten Heizleiters (11) von diesem elektrisch isoliert angeordnet sind.3. Heating device according to claim 2, characterized in that a plurality of metal surfaces are provided which are arranged in an electrically insulated manner from the surroundings of a meandering heating conductor (11).
4. Heizeinrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Metallflächen mindestens ein gut wärmeleitendes Metall enthalten.4. Heating device according to claim 2 or 3, characterized in that the metal surfaces contain at least one highly thermally conductive metal.
5. Heizeinrichtung nach Anspruch 4, dadurch gekennzeich- net, dass das Metall Platin oder eine Platinlegierung ist.5. Heating device according to claim 4, characterized in that the metal is platinum or a platinum alloy.
6. Heizeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Heizleiter (11) in Form von auf einem keramischen Substrat (10) verlaufenden, insbesondere mäanderförmi- gen Platinleiterbahnen ausgebildet ist. 6. Heating device according to claim 1, characterized in that the heating conductor (11) is in the form of, in particular meandering, platinum conductor tracks running on a ceramic substrate (10).
EP01969226A 2000-08-26 2001-08-07 Heating device, in particular for a sensor element for the analysis of gases Withdrawn EP1311841A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10042000 2000-08-26
DE10042000A DE10042000A1 (en) 2000-08-26 2000-08-26 Heating device, in particular for a sensor element for analyzing gases
PCT/DE2001/003020 WO2002018925A1 (en) 2000-08-26 2001-08-07 Heating device, in particular for a sensor element for the analysis of gases

Publications (1)

Publication Number Publication Date
EP1311841A1 true EP1311841A1 (en) 2003-05-21

Family

ID=7653899

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01969226A Withdrawn EP1311841A1 (en) 2000-08-26 2001-08-07 Heating device, in particular for a sensor element for the analysis of gases

Country Status (5)

Country Link
US (1) US20030029861A1 (en)
EP (1) EP1311841A1 (en)
JP (1) JP2004507760A (en)
DE (1) DE10042000A1 (en)
WO (1) WO2002018925A1 (en)

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Publication number Priority date Publication date Assignee Title
DE10225149A1 (en) 2002-06-06 2004-01-15 Robert Bosch Gmbh sensor element
DE10249466B4 (en) * 2002-10-24 2006-03-09 Robert Bosch Gmbh sensor element
DE102006014248A1 (en) * 2006-03-28 2007-10-04 Robert Bosch Gmbh Sensor unit e.g. wideband oxygen sensor, for determining oxygen content in exhaust gas of internal combustion engine, has heater with insulation that surrounds heating unit, where heating unit exhibits meandering profile

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DE3504498A1 (en) * 1985-02-09 1986-08-14 Drägerwerk AG, 2400 Lübeck GAS SENSOR WITH SEVERAL SENSOR ELEMENTS
US4899741A (en) * 1987-01-14 1990-02-13 Hgm Medical Laser Systems, Inc. Laser heated probe and control system
DE4240812A1 (en) * 1992-12-04 1994-06-09 Bosch Gmbh Robert Heater arrangement for a sensor for determining components in gases
DE4318327C2 (en) * 1993-06-02 1997-01-30 Siemens Ag Gas sensor
DE4343089A1 (en) * 1993-12-17 1995-06-29 Bosch Gmbh Robert Planar sensor element based on solid electrolyte
DE19609323B4 (en) * 1996-03-09 2008-11-20 Robert Bosch Gmbh sensor element
US5795545A (en) * 1996-05-20 1998-08-18 Motorola Inc. Integrated ceramic exhaust gas sensors
IT1284901B1 (en) * 1996-10-01 1998-05-28 Mauro Ambrosiano HEATING APPARATUS FOR CLOTHING AND LINEN
DE19710559A1 (en) * 1997-03-14 1998-09-17 Bosch Gmbh Robert Sensor especially mass flow sensor
JP3820706B2 (en) * 1997-10-30 2006-09-13 住友電気工業株式会社 Aluminum nitride heater
DE19803562B4 (en) * 1998-01-30 2011-06-01 Robert Bosch Gmbh sensor element
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Title
See references of WO0218925A1 *

Also Published As

Publication number Publication date
DE10042000A1 (en) 2002-05-16
JP2004507760A (en) 2004-03-11
WO2002018925A1 (en) 2002-03-07
US20030029861A1 (en) 2003-02-13

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