WO2006027292A1 - Element capteur de gaz a electrolyte solide contenant un dispositif de chauffage - Google Patents

Element capteur de gaz a electrolyte solide contenant un dispositif de chauffage Download PDF

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Publication number
WO2006027292A1
WO2006027292A1 PCT/EP2005/053618 EP2005053618W WO2006027292A1 WO 2006027292 A1 WO2006027292 A1 WO 2006027292A1 EP 2005053618 W EP2005053618 W EP 2005053618W WO 2006027292 A1 WO2006027292 A1 WO 2006027292A1
Authority
WO
WIPO (PCT)
Prior art keywords
heater
sensor element
ohms
supply line
element according
Prior art date
Application number
PCT/EP2005/053618
Other languages
German (de)
English (en)
Inventor
Hans-Joerg Renz
Bernd Schumann
Ralf Liedtke
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 WO2006027292A1 publication Critical patent/WO2006027292A1/fr

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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
    • 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
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4071—Cells and probes with solid electrolytes for investigating or analysing gases using sensor elements of laminated structure

Definitions

  • the invention is based on a sensor element according to the preamble of the independent claim.
  • Such a sensor element is known for example from DE 102 49 466 Al.
  • the elongated sensor element has a layered construction in planar technology and has an electrochemical measuring cell which comprises two electrodes and a solid electrolyte arranged between the electrodes.
  • a heater is provided to heat the measuring cell.
  • the heater is electrically insulated from the surrounding solid electrolyte layers by a heater insulation.
  • the heater is electrically connected to two heater leads arranged in the same layer plane as the heater.
  • the heater leads are each electrically connected by means of a via with a arranged on an outer surface of the sensor element contact surface.
  • the heater is connected to a voltage source arranged outside the sensor element via the contact surfaces.
  • the heating power necessary for heating the measuring range of the sensor element to a predetermined setpoint temperature can not be reached, in particular, when the sensor element flows around a comparatively cold measuring gas at high flow velocity.
  • Heating power for the measuring range of the sensor element is provided with the lowest possible voltage. This is also then for the heating of the sensor element sufficient heating power available if the sensor element due to the external conditions a strong heat loss, for example by radiation or convection subject.
  • the sensor element according to the invention has a heater in a measuring range, which is electrically connected to two heater leads.
  • the heater leads are arranged in a feed region of the sensor element.
  • the ratio a between the sum of the electrical resistances of the first and the second heater supply line and the electrical resistance of the heater is in the range of 0.9 to 1.4.
  • the ratio a is indicated in each case at room temperature.
  • the ratio a is particularly advantageously in the range of 1.05 to 1.3, particularly preferably in the range of 1.1 to 1.2.
  • the heater has a resistance per length, which is advantageously at least twice as high as the resistance per length first or second heater supply.
  • the cross-sectional area of the heater is at most 50 percent of the cross-sectional area of the first or second heater supply line.
  • the heater has a specific resistance that is at least twice as large as the specific resistance of the first or second heater supply line.
  • the resistance of the heater is in the range of 0.9 ohms to 1.2 ohms, and the sum of the resistances of the first or second heater leads is in the range of 0.9 ohms to 1.6 ohms.
  • the heater and the first and second heater supply are formed as conductor tracks.
  • the heater is meandering, and the first and second heater leads extend along the longitudinal axis of the sensor element.
  • the first and the second heater supply lines are each connected by means of a through-hole guided through a solid electrolyte film to one contact surface applied on an outer surface of the sensor element so that the measuring range of the sensor element and thus the at least one electrochemical measuring cell can be heated by applying a voltage to the contact surfaces is.
  • the resistance of the plated-through hole and optionally of the contact surfaces is to be included in the resistance of the first and second heater leads.
  • FIG. 1 shows as an exemplary embodiment of the invention a cross section through a sensor element according to the invention along the line I-1 in FIG. 2
  • FIG. 2 shows a longitudinal section lying in a large area of the sensor element through the exemplary embodiment according to the line II-II in FIG.
  • Figure 3 shows a plan view of a large area of the embodiment of the invention in the direction III in Figure 1, and
  • FIG. 4 shows the heating voltage U required for achieving a specific heating power as a function of the resistance ratio a. Description of the embodiment
  • FIGS. 1 to 3 show a planar, layered sensor element with a first, a second, a third and a fourth solid electrolyte layer 21, 22, 23, 24.
  • a heater 41 is provided which is electrically insulated from the first and second solid electrolyte layers 21, 22 by means of a heater insulation 36.
  • the second solid electrolyte layer 22 is followed by a third and a fourth solid electrolyte layer 23, 24.
  • a reference gas space 35 is introduced, which is filled with a reference gas, for example, with ambient air or with a gas having a high oxygen content.
  • a first electrode 31 is applied to the fourth solid electrolyte layer 24.
  • a second electrode 32 is provided, which is exposed to the measurement gas.
  • the second electrode 32 is coated with a protective layer, not shown.
  • the first and second electrodes 31, 32 and the solid electrolyte 24 arranged between the first and second electrodes 31, 32 form an electrochemical cell 33 which is operated, for example, as a Nernst cell or as a pump cell.
  • the electrochemical measuring cell 33 with the first and second electrodes 31, 32 is arranged in a measuring region 11 of the sensor element 10, in which the meandering heater 41 is also provided.
  • the heater 41 is electrically connected to first and second heater leads 51, 52.
  • the heater leads 51, 52 are arranged in a feed region 12 of the sensor element 10.
  • two contact surfaces 56 are provided on the outside of the first solid electrolyte layer 21, which are electrically connected to the first and second heater leads 51, 52, respectively, by means of two plated-through holes 55 penetrating the first solid electrolyte layer 21.
  • the sensor element 10 is connected to a shading (not shown) through which the heater 41 via the contact surfaces 56, the vias 55 and the Schuerzutechnischen 51, 52 is acted upon by a heater voltage.
  • FIG. 4 shows the heating voltage required to achieve a predetermined heating power as a function of the ratio a.
  • A is the quotient of the sum of the resistances of the heater leads 51, 52 and the resistance of the heater 41 to understand. It has been found that a particularly low heater voltage is required when a is in the range of 1.05 to 1.3. The minimum heater voltage is approximately 1.14 at a.
  • the resistors of heater 41 and heater leads 51, 52 in the present embodiment were selected as follows:
  • the resistance per length of the heater 41 is 0.08 ohms / mm to 0.12 ohms / mm, while Resistance per length of the first and second heater leads 51, 52 is in the range of 0.019 ohms / mm to 0.021 ohms / mm.
  • heaters 41 and heater leads 51, 52 are made of the same material, heaters 41 and heater leads 51, 52 were designed so that the
  • Cross-sectional area of the heater 41 at about 0.005 mm 2 and the cross-sectional area of the heater leads 51, 52 are about 0.016 mm 2 .
  • the different cross-sectional areas can be achieved by a corresponding change in the width and / or thickness of the heater and the heater leads.
  • the desired resistance values can be realized by selecting materials with different resistivities for the heater and the heater leads. The transition between heater 41 and heater supply line 51, 52 thus takes place in the region in which the resistance per length of the conductor track changes accordingly.
  • the electrochemical cell 33 and the heater 41 are arranged in the measuring region 11 of the sensor element 10, the heater leads 51, 52, the vias 55, the contact surfaces 56 and the not shown leads for the first and second electrodes 31, 32 in the feed line 12th Since the measuring area 11 is the area of the sensor element which is heated by the heater 41, the
  • the invention is not limited to a sensor element with an electrochemical cell and can be generally transferred to heated sensor elements with one or more electrochemical cells, for example, a so-called broadband lambda probe for detecting the Sauerstoffbartial horrs containing two electrochemical measuring cells, which as pumping cell and as Nernst cell operated.

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  • 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

L'invention concerne un élément capteur (10) qui sert notamment à mettre en évidence une propriété physique d'un gaz de mesure et, de préférence, à déterminer la concentration d'un constituant gazeux dans un gaz d'échappement d'un moteur à combustion interne. Cet élément capteur présente, dans une zone de mesure (11), un dispositif de chauffage (41) et au moins une cellule de mesure électrochimique (33) qui comprend une première électrode (31) et une deuxième électrode (32) ainsi qu'un électrolyte solide (24) placé entre la première et la deuxième électrode. Le dispositif de chauffage (41) est relié à une première conduite d'alimentation de dispositif de chauffage (51) et à une deuxième conduite d'alimentation de dispositif de chauffage (52) qui sont placées dans une zone de conduites d'alimentation (12) de l'élément capteur (10). Selon l'invention, le quotient de la somme des résistances électriques des première et deuxième conduites d'alimentation de dispositif de chauffage (51, 52) à la résistance électrique du dispositif de chauffage (41) est compris entre 0,9 et 1,4.
PCT/EP2005/053618 2004-09-09 2005-07-25 Element capteur de gaz a electrolyte solide contenant un dispositif de chauffage WO2006027292A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410044328 DE102004044328A1 (de) 2004-09-09 2004-09-09 Sensorelement
DE102004044328.9 2004-09-09

Publications (1)

Publication Number Publication Date
WO2006027292A1 true WO2006027292A1 (fr) 2006-03-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/053618 WO2006027292A1 (fr) 2004-09-09 2005-07-25 Element capteur de gaz a electrolyte solide contenant un dispositif de chauffage

Country Status (2)

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DE (1) DE102004044328A1 (fr)
WO (1) WO2006027292A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013211796A1 (de) 2013-06-21 2014-12-24 Robert Bosch Gmbh Sensorelement mit Leiterbahn und Durchführung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4639305A (en) * 1984-06-06 1987-01-27 Ngk Insulators, Ltd. Electrochemical element
US4697165A (en) * 1984-11-01 1987-09-29 Ngk Insulators, Ltd. Ceramic heater and a method of manufacturing the same
US4804823A (en) * 1986-07-31 1989-02-14 Kyocera Corporation Ceramic heater
EP0720018A1 (fr) * 1994-12-27 1996-07-03 General Motors Corporation Elément chauffant à couche épaisse avec plusieurs compositions pour le serpentin et les conducteurs
EP0893688A1 (fr) * 1997-07-24 1999-01-27 Heraeus$Sensor-Nite International Couche de chauffeur avec une resistance variable et méthode pour sa production
US5895591A (en) * 1994-07-06 1999-04-20 Ngk Spark Plug Co., Ltd. Ceramic heater and oxygen sensor
EP1122537A2 (fr) * 2000-02-01 2001-08-08 Denso Corporation Capteur de gaz
DE10249466A1 (de) * 2002-10-24 2004-05-13 Robert Bosch Gmbh Sensorelement

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4639305A (en) * 1984-06-06 1987-01-27 Ngk Insulators, Ltd. Electrochemical element
US4697165A (en) * 1984-11-01 1987-09-29 Ngk Insulators, Ltd. Ceramic heater and a method of manufacturing the same
US4804823A (en) * 1986-07-31 1989-02-14 Kyocera Corporation Ceramic heater
US5895591A (en) * 1994-07-06 1999-04-20 Ngk Spark Plug Co., Ltd. Ceramic heater and oxygen sensor
EP0720018A1 (fr) * 1994-12-27 1996-07-03 General Motors Corporation Elément chauffant à couche épaisse avec plusieurs compositions pour le serpentin et les conducteurs
EP0893688A1 (fr) * 1997-07-24 1999-01-27 Heraeus$Sensor-Nite International Couche de chauffeur avec une resistance variable et méthode pour sa production
EP1122537A2 (fr) * 2000-02-01 2001-08-08 Denso Corporation Capteur de gaz
DE10249466A1 (de) * 2002-10-24 2004-05-13 Robert Bosch Gmbh Sensorelement

Also Published As

Publication number Publication date
DE102004044328A1 (de) 2006-03-16

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