EP0824692A1 - Element capteur - Google Patents

Element capteur

Info

Publication number
EP0824692A1
EP0824692A1 EP96945530A EP96945530A EP0824692A1 EP 0824692 A1 EP0824692 A1 EP 0824692A1 EP 96945530 A EP96945530 A EP 96945530A EP 96945530 A EP96945530 A EP 96945530A EP 0824692 A1 EP0824692 A1 EP 0824692A1
Authority
EP
European Patent Office
Prior art keywords
reference gas
sensor element
gas channel
heating
heating device
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Withdrawn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
EP96945530A
Other languages
German (de)
English (en)
Inventor
Gerhard Schneider
Hans-Joerg Renz
Harald Neumann
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 EP0824692A1 publication Critical patent/EP0824692A1/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a sensor element for an electrochemical sensor for determining the oxygen content of gases, in particular for determining the oxygen content in exhaust gases from internal combustion engines, with the features mentioned in the preamble of claim 1.
  • Sensor elements of the generic type are known. These are designed, for example, as so-called planar sensor elements, which have a first electrode exposed to a measuring gas and a second electrode exposed to a reference gas on a solid electrolyte designed as a carrier. In various applications, the sensor element must be heated to a certain temperature. For this purpose, it is known to assign a heating device to the sensor element, which is usually below the reference device. has exposed heating conductors exposed to gas.
  • a reference gas channel is provided within the layered planar sensor element, which extends, for example, in the longitudinal direction of the sensor element. This reference gas channel runs between the reference gas electrode and the heating conductors.
  • An electrochemical sensor with such a sensor element is known for example from DE 29 28 496. It is disadvantageous here that the reference gas channel represents a poor heat conductor for the thermal energy given off by the heating device, so that heating of the sensor element to its operating temperature is only possible with increased heating energy or after a correspondingly long heating time. In particular in the case of sensor elements in which the heating conductors are directly connected to the reference gas channel, there is poor heat transfer to the sensor element.
  • the sensor element according to the invention offers the advantage that heat transfer from the heating device to the sensor element is significantly improved. Because the reference gas channel is divided at least in the area of the heating device, / 33163 PC17DE96 / 02031
  • the substrate located between the divided (branched) reference gas channels.
  • This substrate has a much better thermal conductivity than the reference gas in the reference gas channels, so that heat transfer is possible more quickly and with greater effectiveness.
  • a shorter heating-up time of the sensor element or a higher sensor element temperature for a given heating output of the heating device can be achieved in this way.
  • the heating power of the heating device can be reduced while maintaining the heating time and the same sensor element temperature, so that there is improved long-term stability of the heating device and improved thermal shock behavior of the sensor element.
  • the branching of the reference gas channel in the area of the heating device also increases the mechanical stability of the entire planar sensor element, since webs remaining between the individual branches of the reference gas channel lead to a smaller, unsupported reference gas channel width.
  • Another advantage of the sensor element according to the invention results from the fact that there is no longer any overlap between the reference gas channel width and an insulation system of the heating conductors. As a result, injuries to the insulation system in the area of the heat conductor during the manufacture of the Sensor elements, in particular when laminating the individual layers of the sensor elements, are avoided. The minimization or exclusion of injuries to the insulation system results in an improved leakage current behavior of the heating conductors.
  • FIG. 1 shows a longitudinal section through a sensor element according to the invention
  • Figure 2 shows a cross section through the sensor element according to Figure 1 and
  • Figure 3 shows a cross section through an inventive sensor element according to another embodiment.
  • a part of a sensor element 10 is shown in a cut-away longitudinal view in FIG.
  • the sensor element 10 is part of an electrochemical sensor (not shown) and is sealed fixed in a housing of the sensor.
  • the sensor element 10 has a planar layer structure, which is explained in more detail with reference to FIG. 2. 1 shows a section 12 of the sensor element 10 on the measuring gas side.
  • the sensor element 10 also has a section (not shown) on the reference gas side.
  • the sensor element 10 has a first electrode 14 which can be exposed to a measurement gas, for example the exhaust gas of a motor vehicle.
  • the electrode 14 is in this case applied to a solid electrolyte, for example stabilized zirconium oxide, which simultaneously serves as a carrier 16.
  • the carrier 16 On its side facing away from the electrode 14, the carrier 16 has a second electrode 18 which can be exposed to a reference gas, for example atmospheric oxygen.
  • a reference gas for example atmospheric oxygen.
  • the sensor element 10 has a reference gas channel 20 running in the longitudinal direction.
  • the reference gas channel 20 branches into two reference gas channel arms 22, which run below the electrode 18, which is also divided accordingly.
  • the reference gas channel 20 or the reference gas channel arms 22 are structured in a substrate 24. The branching of the reference gas channel 20 results in closed regions 26 of the substrate 24 between the reference gas channel arms 22.
  • FIGS. 1 and 2 The illustration shown in FIGS. 1 and 2 with two reference gas channel arms 22 is only exemplary.
  • the reference gas channel 20 can be divided into several individual arms.
  • a further substrate layer 28 is arranged below the substrate 24, which has a heating device 30 for the sensor element 10.
  • the heating device 30 has meandering heating conductors 32 which are arranged such that they are covered by the substrate 24 or the areas 26 of the substrate 24. The heating conductors 32 thus run in such a way that there is no direct connection to the reference gas channel arms 22.
  • the arrangement of the reference gas channel arms 22 in relation to the heating conductors 32 selected in FIGS. 1 and 2 ensures that the heating conductors 32 are surrounded on all sides by the substrate of the substrate layer 28 and the substrate 24 or the regions 26 of the substrate 24. This ensures good heat conduction of the thermal energy introduced via the heating conductors 32 into the sensor element 10 to the carrier 16 having the electrodes 14 and 18.
  • the reference gas channel arms 22 thus exert only an extremely small insulation influence on the heat transfer.
  • the division of the reference gas channel 20 into the reference gas channel arms 22 can advantageously be limited to the active range of action of the heating device 30, so that only the entire sensor element a reference gas channel 20 extending in the longitudinal direction is provided.
  • the electrode 18 exposed to the reference gas is advantageously divided in an analogous manner to the reference gas channel arms 22, so that all of the sides of the reference gas channel arms 22 facing the carrier 16 are covered with a region of the electrode 18.
  • the improved heat transfer from the heating device 30 to the actual sensing area of the sensor element 10 means that a shorter heating time of the sensor element 10 is possible with the same heating power.
  • the heating power can be reduced, so that the overall long-term stability of the heating device 30 or the sensor element 10 is improved.
  • a lower heating output simultaneously results in improved thermal shock behavior of the sensor element 10, that is to say that if the sensor element 10 suddenly contacts a cooler medium, for example splash water, condensed water or the like, there is no such high temperature difference with a reduced heating output.
  • the regions 26 of the substrate 24 contribute to a higher mechanical stability of the section 12 of the sensor element 10 because of the division of the reference gas channel 20 into individual reference gas channel alarms 22 a cantilever reference gas channel width is reduced in the area of the section 12.
  • the reference gas channel arms 22 are made narrower than the distance between the heating conductors 32, so that the heating conductors run at a greater distance from the reference gas channel arms 22. It is thereby achieved that the heat conduction via the substrate 24 or the region 26 of the substrate 24 to the electrodes 18 or 14 is improved, since the heat conduction via the substrate 24 or the region 26 is greater than a heat radiation via the reference gas channel arms 22.
  • the manufacturing steps of the sensor element 10 should not be dealt with in more detail within the scope of the present description, since these can be produced by means of known process steps, such as, for example, film casting, printing, punching, milling or embossing.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

Cet élément capteur, notamment pour un capteur électrochimique de mesure, sert à déterminer la teneur en oxygène de gaz. L'élément capteur comprend une première électrode exposée à un gaz de mesure, une deuxième électrode exposée à un gaz de référence, un élément chauffant pour l'élément capteur et un canal de gaz de référence qui s'étend entre l'élément chauffant et la deuxième électrode. Le canal de gaz de référence (20) est ramifié au moins dans la zone de l'élément chauffant (30).
EP96945530A 1996-03-09 1996-10-23 Element capteur Withdrawn EP0824692A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19609323A DE19609323B4 (de) 1996-03-09 1996-03-09 Sensorelement
DE19609323 1996-03-09
PCT/DE1996/002031 WO1997033163A1 (fr) 1996-03-09 1996-10-23 Element capteur

Publications (1)

Publication Number Publication Date
EP0824692A1 true EP0824692A1 (fr) 1998-02-25

Family

ID=7787824

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96945530A Withdrawn EP0824692A1 (fr) 1996-03-09 1996-10-23 Element capteur

Country Status (5)

Country Link
US (1) US5902470A (fr)
EP (1) EP0824692A1 (fr)
JP (1) JP3868497B2 (fr)
DE (1) DE19609323B4 (fr)
WO (1) WO1997033163A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19803562B4 (de) * 1998-01-30 2011-06-01 Robert Bosch Gmbh Sensorelement
DE19930636A1 (de) * 1999-07-02 2001-01-18 Bosch Gmbh Robert Elektrochemischer Gassensor und Verfahren zur Bestimmung von Gaskomponenten
DE10042000A1 (de) * 2000-08-26 2002-05-16 Bosch Gmbh Robert Heizeinrichtung, insbesondere für ein Sensorelement zur Analyse von Gasen
DE10051833C2 (de) * 2000-10-19 2002-12-19 Bosch Gmbh Robert Planares Gassensorelement
DE10149739A1 (de) * 2001-10-09 2003-04-10 Bosch Gmbh Robert Sensorelement eines Gassensors
DE102005060864A1 (de) * 2005-12-20 2007-06-28 Robert Bosch Gmbh Gassensorelement

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2928496A1 (de) * 1979-07-14 1981-01-29 Bosch Gmbh Robert Elektrochemischer messfuehler fuer die bestimmung des sauerstoffgehaltes in gasen
JPS5968190A (ja) * 1982-10-08 1984-04-18 日本碍子株式会社 ヒ−タ−
JPS59197851A (ja) * 1983-04-26 1984-11-09 Ngk Insulators Ltd 電気化学的素子および装置
JPS6036949A (ja) * 1983-08-09 1985-02-26 Ngk Insulators Ltd 酸素センサ素子
DE3729164C2 (de) * 1986-09-01 1997-09-11 Denso Corp Meßfühler zur Messung der Sauerstoffkonzentration in Gasen
US4900412A (en) * 1988-08-24 1990-02-13 General Motors Corporation Heated solid electrolyte oxygen sensor having unique heater element
US4980044A (en) * 1989-03-31 1990-12-25 General Motors Corporation Oxygen sensor having a flat plate element and heater
US5296112A (en) * 1992-06-02 1994-03-22 H.P.S. Merrimac, Inc. Oxygen monitoring devices
US5384030A (en) * 1994-02-15 1995-01-24 General Motors Corporation Exhaust sensor including a composite tile sensing element and methods of making the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9733163A1 *

Also Published As

Publication number Publication date
DE19609323A1 (de) 1997-09-11
JPH11505618A (ja) 1999-05-21
DE19609323B4 (de) 2008-11-20
JP3868497B2 (ja) 2007-01-17
WO1997033163A1 (fr) 1997-09-12
US5902470A (en) 1999-05-11

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