[go: up one dir, main page]

WO2005121763A1 - Capteur concu pour determiner la concentration en oxygene dans des gaz d'echappement de moteurs a combustion interne - Google Patents

Capteur concu pour determiner la concentration en oxygene dans des gaz d'echappement de moteurs a combustion interne Download PDF

Info

Publication number
WO2005121763A1
WO2005121763A1 PCT/EP2005/051899 EP2005051899W WO2005121763A1 WO 2005121763 A1 WO2005121763 A1 WO 2005121763A1 EP 2005051899 W EP2005051899 W EP 2005051899W WO 2005121763 A1 WO2005121763 A1 WO 2005121763A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
gas
sensor according
absorption material
sensor element
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
PCT/EP2005/051899
Other languages
German (de)
English (en)
Inventor
Jens Schneider
James Richard Waldrop Ii
Claus Schnabel
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 WO2005121763A1 publication Critical patent/WO2005121763A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4077—Means for protecting the electrolyte or the electrodes

Definitions

  • the invention is based on a sensor for determining the oxygen concentration in the exhaust gas of internal combustion engines, according to the preamble of claim 1.
  • a known electrochemical sensor for determining the oxygen content in exhaust gases from internal combustion engines or internal combustion engines there is the protective tube attached to the sensor housing by welding or by means of a screw thread, which is at a distance of 0.01 to 20 mm around the gas-sensitive protruding section of the sensor element is arranged from a porous sintered material. It is thereby achieved that no longer the entire exhaust gas flow, but only part of it, reaches the sensor element through the pores of the protective tube.
  • the size and speed of the exhaust gas stream that strikes the sensor element can be adjusted by varying the wall thickness of the protective tube and the pore size of the sintered material.
  • the sintered material prevents inactivation of the sensor element as a result of 'poisoning' with sulfur- or phosphorus-containing compounds and lead, which are contained in the exhaust gas.
  • the sintered material protective tube keeps pressure and temperature shocks away from the sensor element and causes an even temperature at the sensor element
  • Sintered material uses porous ceramic materials such as sillimanite, codierite, silica, corundum, forsterite.
  • the sensor according to the invention with the features of claim 1 has the advantage that by introducing the sensor element to protect it from 'poisoning' Absorbent material in the measuring room, the design of the sensor remains unscanned and the sensor is only supplemented by a component, which offers manufacturing advantages.
  • the protective tube which is preferably made of metal, ensures reliable protection of the sensor against mechanical damage during assembly. A functional failure or a creeping functional drift over the service life of the sensor due to poisoning of the outer electrode arranged in the gas-sensitive protruding section of the sensor element by foreign or pollutants contained in the exhaust gas, such as silicon, phosphorus, sulfur and boron compounds, is prevented. In the same way, thermal shock from water hammer is prevented, since moisture contained in the exhaust gas is retained by the absorption material and condensation does not form, which then drops onto the hot sensor element in the form of drops.
  • the measuring space is completely filled with the absorption material in the form of granules.
  • this can be achieved particularly easily by means of filling, the diameter of the gas passage holes in the protective tube being adapted to the grain size of the granules or the gas passage holes being provided with a mesh whose mesh size is smaller than the grain size of the granules.
  • a granulate made of gamma or delta aluminum oxide, zeolite or boehmite is used as the absorption material.
  • the absorption material has a porous, coral or sponge-like structure. This enables greater mechanical stability of the sensor to be achieved.
  • such a structure is produced by introducing a paste of gamma-aluminum oxide ( ⁇ -AUOa) and further additives, pore formers and organic binders into the measuring space and subsequent baking, the baking temperature being greater than 800 ° C. drawing
  • the sensor in section in longitudinal section in FIG. 1 with its measuring range for determining the oxygen concentration in the exhaust gas of internal combustion engines has a sensor housing 10 which is provided with a screw-in thread 11 for installation in an exhaust pipe of the internal combustion engine.
  • a sensor element 12 is received in the sensor housing 10, which projects axially from the sensor housing 10 with a gas-sensitive section 121.
  • the protruding section 121 is covered by a cap-shaped Schulzrohr 13 which is attached to the sensor housing 10 e.g. is fastened by welding
  • the scarf pipe 13 provided with gas passage holes 14 includes a measuring space 15 surrounding the projecting section 121, which is in gas exchange connection with the exhaust gas flow of the internal combustion engine via the gas passage holes 14.
  • the measuring space 15 there is a porous, reactive ceramic absorption material 16 surrounding the gas-sensitive protruding section 121 of the sensor element 12 for physically and / or chemically binding components which are harmful to the sensor element 12 and which are contained in the exhaust gas, such as silicon, phosphorus, Sulfur and / or boron compounds.
  • the absorption material completely fills the measuring space 15.
  • the ceramic absorption material 16 is filled into the measuring space 15 as granules, which consists of gamma or delta aluminum oxide, zeolite or boehmite.
  • the ceramic absorption material prevents, through the physical bonding or chemical conversion of the exhaust gas components mentioned, that these components, which are harmful to the sensor element 10, reach the gas-sensitive protruding section 121 of the sensor element 12 and there, through deposition or chemical reactions, so-called poisoning of the Cause sensor element 12, which causes a functional failure or a creeping functional drift of the sensor over its period of use.
  • moisture contained in the exhaust gas is bound in the porous absorption material 16, so that no drops of condensed water get onto the hot, gas-sensitive protruding section 121 of the sensor element 12 and can trigger a thermal shock there, which leads to cracks in the sensor element 12 and likewise to the functional failure of the sensor.
  • the ceramic absorption material 16 arranged in the measurement space 15 and immediately upstream of the sensor element 12 the robustness of the measurement sensor is increased and its service life is increased.
  • the sensor shown in FIG. 2 differs from the sensor shown in FIG. 1 in that, instead of the protective tube 13, a hood-shaped double protective tube 17 covers the gas-sensitive protruding section 121 of the sensor element 12 and is fastened to the sensor housing 10.
  • the double protective tube 17 consists of an inner protective tube 18 and an outer protective tube 19, in each of which gas passage holes 20 and 21 are provided.
  • the measuring space 15 enclosed by the inner protective tube 18 is completely filled with the porous, reactive, ceramic absorption material 16, which, unlike in FIG. 1, does not consist of granules, but instead has an extremely porous, coral or sponge-like structure.
  • This structure is achieved by using a paste made of ganama aluminum oxide ( ⁇ -Al 0 3 ) and other additives made of magnesium oxide (MgO), magnesium titanium oxide (MgTi0 3 ) or lithium oxide (Li 2 0 3 ) and porosity, for example carbonates Mg, Li, and organic binders are introduced into the measuring space 15 and then baked, the baking temperature being greater than 700 ° C.
  • a paste made of ganama aluminum oxide ( ⁇ -Al 0 3 ) and other additives made of magnesium oxide (MgO), magnesium titanium oxide (MgTi0 3 ) or lithium oxide (Li 2 0 3 ) and porosity, for example carbonates Mg, Li, and organic binders are introduced into the measuring space 15 and then baked, the baking temperature being greater than 700 ° C.
  • the exemplary embodiment of the sensor shown in FIG. 3 differs from the exemplary embodiment shown in FIG. 1 in that the ceramic absorption material 16 in the form of a ceramic sleeve 22, which is present in the measuring space 15, is pushed onto the gas-sensitive section 121 of the sensor element 12 with only slight play ,
  • the sleeve 22 can be open on the face or - as shown in FIG. 3 - be provided on the face with a sleeve bottom.
  • the absorption material 16 or the sleeve 22 made from this absorption material 16 essentially consists of stabilized gamma aluminum oxide or zeolite.
  • the wall thickness of the sleeve 22 is dimensioned such that both an adequate mechanical strength and a sufficiently large porosity or gas permeability is ensured.

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)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

La présente invention concerne un capteur conçu pour déterminer la concentration en oxygène dans des gaz d'échappement de moteurs à combustion interne. Ce capteur présente un élément de détection (12) logé dans un boîtier de capteur (10), qui fait saillie du boîtier de capteur (10) avec une section sensible au gaz (121), ainsi qu'un tube protecteur de type chapeau (13) qui est fixé sur le boîtier de capteur (10) et qui recouvre la section sensible au gaz (121). Ce tube protecteur entoure une chambre de mesure (15) qui est en liaison d'échange gazeux avec les gaz d'échappement par l'intermédiaire d'ouvertures de passage de gaz (14) dans le tube protecteur (13). Afin d'éviter une contamination de l'élément de détection (12) dans un environnement thermique et chimique agressif, une matière d'absorption céramique réactive et poreuse (16) est placée dans la chambre de mesure (15). Cette matière d'absorption entoure la section sensible au gaz (121) de l'élément de détection (12) et est conçue pour se lier de manière physique et/ou chimique aux composants nocifs pour l'élément de détection (12) qui sont contenus dans les gaz d'échappement.
PCT/EP2005/051899 2004-06-05 2005-04-27 Capteur concu pour determiner la concentration en oxygene dans des gaz d'echappement de moteurs a combustion interne Ceased WO2005121763A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410027633 DE102004027633A1 (de) 2004-06-05 2004-06-05 Messfühler zur Bestimmung der Sauerstoffkonzentration im Abgas von Brennkraftmaschinen
DE102004027633.1 2004-06-05

Publications (1)

Publication Number Publication Date
WO2005121763A1 true WO2005121763A1 (fr) 2005-12-22

Family

ID=34965186

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/051899 Ceased WO2005121763A1 (fr) 2004-06-05 2005-04-27 Capteur concu pour determiner la concentration en oxygene dans des gaz d'echappement de moteurs a combustion interne

Country Status (2)

Country Link
DE (1) DE102004027633A1 (fr)
WO (1) WO2005121763A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103529105A (zh) * 2013-11-06 2014-01-22 惠州市富济电子材料有限公司 一种管式氧传感器测试电极及保护层
US8906214B2 (en) 2003-02-10 2014-12-09 Robert Bosch Gmbh Contamination-resistant gas sensor element
US9297791B2 (en) 2012-12-20 2016-03-29 Robert Bosch Gmbh Gas sensor with thermal shock protection
JP5997833B2 (ja) * 2013-03-28 2016-09-28 日本碍子株式会社 ガスセンサ
WO2023046539A1 (fr) * 2021-09-21 2023-03-30 Eos Gmbh Electro Optical Systems Système de détection pour dispositif de fabrication additive, dispositif de fabrication additive et procédé de mesure

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009006290A1 (fr) * 2007-06-29 2009-01-08 Robert Bosch Corporation Elément détectant des gaz résistant à la contamination
DE102007052049B4 (de) 2007-10-31 2020-06-18 Globalfoundries Dresden Module One Limited Liability Company & Co. Kg Verfahren zum Strukturieren von vertikalen Kontakten und Metallleitungen in einem gemeinsamen Ätzprozess
CN101264913B (zh) * 2008-04-03 2010-10-06 苏州大学 珊瑚状纳米α-Al2O3的快速制备方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3000993A1 (de) * 1980-01-12 1981-07-23 Daimler Benz Ag Elektrochemischer messfuehler mit schutzeinrichtung fuer die bestimmung des sauerstoffgehaltes in abgasen, insbesondere von verbrennungsmotoren
JPS5754856A (en) * 1980-09-19 1982-04-01 Matsushita Electric Ind Co Ltd Oxygen concentration detector
EP0331513A2 (fr) * 1988-03-03 1989-09-06 Ngk Insulators, Ltd. Sonde d'oxygène et méthode pour sa fabrication
DE4342064A1 (de) * 1992-12-10 1994-06-30 Nippon Denso Co Gassensor
US5707504A (en) * 1995-01-19 1998-01-13 Nippondenso Co., Ltd. Oxygen concentration detector
WO2001067082A1 (fr) * 2000-03-10 2001-09-13 Robert Bosch Gmbh Sonde electrochimique
DE10153735A1 (de) * 2001-10-31 2003-05-22 Bosch Gmbh Robert Meßfühler
DE10256476A1 (de) * 2001-12-03 2003-07-17 Denso Corp Gassensorelement und sein Herstellungsverfahren

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3000993A1 (de) * 1980-01-12 1981-07-23 Daimler Benz Ag Elektrochemischer messfuehler mit schutzeinrichtung fuer die bestimmung des sauerstoffgehaltes in abgasen, insbesondere von verbrennungsmotoren
JPS5754856A (en) * 1980-09-19 1982-04-01 Matsushita Electric Ind Co Ltd Oxygen concentration detector
EP0331513A2 (fr) * 1988-03-03 1989-09-06 Ngk Insulators, Ltd. Sonde d'oxygène et méthode pour sa fabrication
DE4342064A1 (de) * 1992-12-10 1994-06-30 Nippon Denso Co Gassensor
US5707504A (en) * 1995-01-19 1998-01-13 Nippondenso Co., Ltd. Oxygen concentration detector
WO2001067082A1 (fr) * 2000-03-10 2001-09-13 Robert Bosch Gmbh Sonde electrochimique
DE10153735A1 (de) * 2001-10-31 2003-05-22 Bosch Gmbh Robert Meßfühler
DE10256476A1 (de) * 2001-12-03 2003-07-17 Denso Corp Gassensorelement und sein Herstellungsverfahren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 129 (P - 128) 15 July 1982 (1982-07-15) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8906214B2 (en) 2003-02-10 2014-12-09 Robert Bosch Gmbh Contamination-resistant gas sensor element
US9297791B2 (en) 2012-12-20 2016-03-29 Robert Bosch Gmbh Gas sensor with thermal shock protection
JP5997833B2 (ja) * 2013-03-28 2016-09-28 日本碍子株式会社 ガスセンサ
CN103529105A (zh) * 2013-11-06 2014-01-22 惠州市富济电子材料有限公司 一种管式氧传感器测试电极及保护层
CN103529105B (zh) * 2013-11-06 2015-09-02 惠州市富济电子材料有限公司 一种管式氧传感器测试电极及保护层
WO2023046539A1 (fr) * 2021-09-21 2023-03-30 Eos Gmbh Electro Optical Systems Système de détection pour dispositif de fabrication additive, dispositif de fabrication additive et procédé de mesure

Also Published As

Publication number Publication date
DE102004027633A1 (de) 2006-01-05

Similar Documents

Publication Publication Date Title
DE4004172C2 (de) Sauerstoffsensor zur Luft-Brennstoffgemisch-Kontrolle mit einer Schutzschicht, die eine Sauerstoff einschließende Substanz umfaßt, und Verfahren zur Herstellung des Sensors
DE2657437C3 (de) Sauerstoff-Meßfühler
DE102009026683B4 (de) Kohlenwasserstoff-Einfanganordnung mit geringer Einschränkung
US8176767B2 (en) Exhaust gas sensor
WO2005121763A1 (fr) Capteur concu pour determiner la concentration en oxygene dans des gaz d'echappement de moteurs a combustion interne
EP0604468A1 (fr) Capteur de gaz d'echappement
DE3941837A1 (de) Widerstandsmessfuehler zur erfassung von gaszusammensetzungen und verfahren zu seiner herstellung
EP1807691B1 (fr) Element de protection d'une sonde, sonde et corps alveolaire
JP4416551B2 (ja) 多孔質電極及びそれを用いてなる電気化学的セル並びにＮＯｘセンサ素子
EP1047932B1 (fr) Detecteur de gaz avec une garniture d'etancheite et procede de production de ladit detecteur
JP2000310610A (ja) ガスセンサ素子及びその製造方法
DE4007819C2 (fr)
DE102014118153A1 (de) Gassensorelement
DE102014206247A1 (de) Sensor zur Erfassung mindestens einer Eigenschaft eines Messgases in einem Messgasraum und Verfahren zum Herstellen
DE102004063085A1 (de) Gasmessfühler
JP4532286B2 (ja) 測定センサ
DE102008043219A1 (de) Gassensor
EP1508036A1 (fr) Sonde d'oxygene ou de temperature, dont le manchon est rempli de granules diminuant la sensibilite aux chocs
US6276191B1 (en) Oxygen sensor
DE102004017586A1 (de) Gassonde mit beschichteter Schutzeinrichtung
DE102004015783A1 (de) Messfühler zur Bestimmung der Sauerstoffkonzentration im Abgas von Brennkraftmaschinen
JP2000002685A (ja) ガスセンサ用ハウジング
DE2627596B2 (de) Vorrichtung zur katalytischen Reinigung der Abgase an Brennkraftmaschinen
DE102004050630B4 (de) Lambdasonde zur Analyse von Abgasen
DE2632138A1 (de) Sauerstoffuehler zum messen des unterschieds in der sauerstoffkonzentration zwischen zwei gasen

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase