DE102004027633A1 - Sensor for determining the oxygen concentration in the exhaust gas of internal combustion engines - Google Patents
Sensor for determining the oxygen concentration in the exhaust gas of internal combustion engines Download PDFInfo
- Publication number
- DE102004027633A1 DE102004027633A1 DE200410027633 DE102004027633A DE102004027633A1 DE 102004027633 A1 DE102004027633 A1 DE 102004027633A1 DE 200410027633 DE200410027633 DE 200410027633 DE 102004027633 A DE102004027633 A DE 102004027633A DE 102004027633 A1 DE102004027633 A1 DE 102004027633A1
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- Germany
- Prior art keywords
- sensor
- gas
- exhaust gas
- sensor element
- sensor according
- Prior art date
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- 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
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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)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Es wird ein Messfühler zur Bestimmung der Sauerstoffkonzentration im Abgas von Brennkraftmaschinen angegeben, der ein in einem Fühlergehäuse (10) aufgenommenes Sensorelement (12), das mit einem gassensitiven Abschnitt (121) aus dem Fühlergehäuse (10) vorsteht, und ein am Fühlergehäuse (10) festgelegtes, den gassensitiven Abschnitt (121) überdeckendes, haubenartiges Schutzrohr (13) aufweist, das einen über Gasdurchtrittsöffnungen (14) im Schutzrohr (13) mit dem Abgas in Gasaustauschverbindung stehenden Messraum (15) einschließt. Zur Verhinderung einer Vergiftung des Sensorelements (12) in aggressiver thermischer und chemischer Umgebung ist im Messraum (15) ein den gassensitiven Abschnitt (121) des Sensorelements (12) umschließendes, poröses, reaktionsfähiges, keramisches Absorptionsmaterial (16) zum physikalischen und/oder chemischen Binden von im Abgas enthaltenen, für das Sensorelement (12) schädlichen Bestandteilen angeordnet (Fig. 1).A sensor for determining the oxygen concentration in the exhaust gas of internal combustion engines is provided, which has a sensor element (12) received in a sensor housing (10) projecting from the sensor housing (10) with a gas-sensitive section (121) and a sensor housing (10 ), the gas-sensitive portion (121) covering, hood-like protective tube (13) which encloses a via gas passage openings (14) in the protective tube (13) with the exhaust gas in gas exchange connection measuring space (15). In order to prevent poisoning of the sensor element (12) in an aggressive thermal and chemical environment, a porous, reactive, ceramic absorption material (16) enclosing the gas-sensitive section (121) of the sensor element (12) for physical and / or chemical absorption is provided in the measuring chamber (15) Binding contained in the exhaust, for the sensor element (12) harmful components arranged (Fig. 1).
Description
Die Erfindung geht aus von einem Messfühler zur Bestimmung der Sauerstoffkonzentration im Abgas von Brennkraftmaschinen, nach dem Oberbegriff des Anspruchs 1.The 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 the claim 1.
Bei
einem bekannten elektrochemischen Messfühler zur Bestimmung des Sauerstoffgehalts
in Abgasen von Brennkraftmaschinen oder Verbrennungsmotoren (
Vorteile der ErfindungAdvantages of invention
Der erfindungsgemäße Messfühler mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass durch das Einbringen des das Sensorelement vor "Vergiftung" schützenden Absorptionsmaterials in den Messraum das Design des Messfühlers unabgetastet bleibt und der Messfühler lediglich um eine Baukomponente ergänzt wird, was fertigungstechnische Vorteile bietet. Das vorzugsweise aus Metall bestehende Schutzrohr gewährleistet einen zuverlässigen Schutz des Messfühlers gegen mechanische Beschädigungen bei der Montage. Ein Funktionsausfall oder eine schleichende Funktionsdrift über die Einsatzdauer des Messfühlers aufgrund einer Vergiftung der im gassensitiven Vorstehabschnitt des Sensorelements angeordneten Außenelektrode durch im Abgas enthaltene Fremd- oder Schadstoffe, wie Silizium-, Phosphor-, Schwefel- und Bor-Verbindungen, wird verhindert. In gleicher Weise wird ein Thermoschock durch Wasserschlag verhindert, da im Abgas enthaltene Feuchtigkeit vom Absorptionsmaterial zurückgehalten wird und es nicht zur Bildung von Kondenswasser kommt, das dann in Tropfenform auf das heiße Sensorelement auftrifft.Of the inventive sensor with The features of claim 1 has the advantage that by introducing of the sensor element from "poisoning" protective absorbent material in the measuring room the design of the probe remains unscanned and the sensor only a component is added, which is manufacturing technology Offers advantages. The preferably made of metal protective tube guaranteed a reliable one Protection of the sensor against mechanical damage during installation. A functional failure or a creeping drift over the function Operating time of the sensor due to poisoning of the gas-sensitive protruding section of the sensor element arranged outside electrode in the exhaust gas Contaminated or pollutants such as silicon, phosphorus, sulfur and boron compounds, is prevented. In the same way, a Thermal shock prevented by water hammer, as contained in the exhaust gas Moisture is retained by the absorbent material and not The formation of condensation occurs, then in the form of drops the hot Sensor element impinges.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Messfühlers möglich.By in the further claims listed activities are advantageous developments and improvements of the claim 1 specified sensor possible.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist der Messraum vollständig mit dem als Granulat ausgebildeten Absorptionsmaterial ausgefüllt. Dies ist fertigungstechnisch besonders einfach durch Schüttung zu realisieren, wobei der Durchmesser der Gasdurchtrittslöcher im Schutzrohr an die Korngröße des Granulats angepasst wird oder die Gasdurchtrittslöcher mit einem Netz versehen werden, deren Maschenweite kleiner ist als die Korngröße des Granulats.According to one preferred embodiment of Invention, the measuring space is completely formed with the granules Absorptive material filled. This is particularly easy to produce by filling realize, wherein the diameter of the gas passage holes in Protective tube to the grain size of the granules be adapted or the gas passage holes are provided with a network, whose mesh size is smaller than the grain size of the granules.
Gemäß einer vorteilhaften Ausführungsform der Erfindung wird bei einer solchen Granulatfüllung des Messraums als Absorptionsmaterial ein Granulat aus gamma- oder delta-Aluminiumoxid, Zeolith oder Boehemit verwendet.According to one advantageous embodiment of the Invention is in such a granular filling of the measuring space as absorption material granules of gamma or delta alumina, zeolite or boehmite used.
Gemäß einer vorteilhaften Ausführungsform der Erfindung weist das Absorptionsmaterial eine poröse, korallen- oder schwammartige Struktur auf. Dadurch lässt sich eine größere mechanische Stabilität des Messfühlers erreichen.According to one advantageous embodiment of the Invention, the absorbent material has a porous, coral or sponge-like Structure on. By doing so leaves a larger mechanical Stability of the probe to reach.
Gemäß einer vorteilhaften Ausführungsform der Erfindung wird eine solche Struktur durch Einbringen einer Paste aus gamma-Aluminiumoxid (γ-Al2O3) und weiteren Zuschlägen, Porenbildnern und organischen Bindern in den Messraum und anschließendes Einbrennen hergestellt, wobei die Einbrenntemperatur größer 800°C ist.According to an advantageous embodiment of the invention, such a structure is prepared by introducing a paste of gamma-alumina (γ-Al 2 O 3 ) and other additives, pore formers and organic binders in the measuring chamber and subsequent baking, wherein the baking temperature is greater than 800 ° C. ,
Zeichnungdrawing
Die Erfindung ist anhand von in der Zeichnung dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert. Es zeigen:The The invention is based on embodiments shown in the drawing explained in more detail in the following description. Show it:
Beschreibung der Ausführungsbeispieledescription the embodiments
Der
in
Im
Ausführungsbeispiel
der
Der
in
Das
in
Claims (11)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410027633 DE102004027633A1 (en) | 2004-06-05 | 2004-06-05 | Sensor for determining the oxygen concentration in the exhaust gas of internal combustion engines |
PCT/EP2005/051899 WO2005121763A1 (en) | 2004-06-05 | 2005-04-27 | Sensor for determining the oxygen concentration in internal combustion engines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410027633 DE102004027633A1 (en) | 2004-06-05 | 2004-06-05 | Sensor for determining the oxygen concentration in the exhaust gas of internal combustion engines |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102004027633A1 true DE102004027633A1 (en) | 2006-01-05 |
Family
ID=34965186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200410027633 Withdrawn DE102004027633A1 (en) | 2004-06-05 | 2004-06-05 | Sensor for determining the oxygen concentration in the exhaust gas of internal combustion engines |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102004027633A1 (en) |
WO (1) | WO2005121763A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009006290A1 (en) * | 2007-06-29 | 2009-01-08 | Robert Bosch Corporation | Contamination-resistant gas sensor element |
CN101264913B (en) * | 2008-04-03 | 2010-10-06 | 苏州大学 | Fast preparation method for coralloid nano alpha-Al2O3 |
US8198190B2 (en) | 2007-10-31 | 2012-06-12 | Globalfoundries Inc. | Semiconductor device and method for patterning vertical contacts and metal lines in a common etch process |
US8906214B2 (en) | 2003-02-10 | 2014-12-09 | Robert Bosch Gmbh | Contamination-resistant gas sensor element |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9297791B2 (en) | 2012-12-20 | 2016-03-29 | Robert Bosch Gmbh | Gas sensor with thermal shock protection |
WO2014157279A1 (en) * | 2013-03-28 | 2014-10-02 | 日本碍子株式会社 | Gas sensor |
CN103529105B (en) * | 2013-11-06 | 2015-09-02 | 惠州市富济电子材料有限公司 | A kind of tubular oxygen sensor test electrode and protective seam |
DE102021124442A1 (en) * | 2021-09-21 | 2023-03-23 | Eos Gmbh Electro Optical Systems | Sensor arrangement for an additive manufacturing device |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3000993A1 (en) * | 1980-01-12 | 1981-07-23 | Daimler Benz Ag | ELECTROCHEMICAL PROBE WITH PROTECTIVE DEVICE FOR DETERMINING THE OXYGEN CONTENT IN EXHAUST GAS, IN PARTICULAR OF COMBUSTION ENGINES |
JPS5754856A (en) * | 1980-09-19 | 1982-04-01 | Matsushita Electric Ind Co Ltd | Oxygen concentration detector |
DE68912793T2 (en) * | 1988-03-03 | 1994-06-23 | Ngk Insulators Ltd | Oxygen sensor and method for its manufacture. |
JP2748809B2 (en) * | 1992-12-10 | 1998-05-13 | 株式会社デンソー | Gas detector |
JP3629786B2 (en) * | 1995-01-19 | 2005-03-16 | 株式会社デンソー | Oxygen concentration detector |
DE20004514U1 (en) * | 2000-03-10 | 2001-07-26 | Robert Bosch Gmbh, 70469 Stuttgart | Electrochemical sensor |
DE10153735B4 (en) * | 2001-10-31 | 2007-12-13 | Robert Bosch Gmbh | probe |
JP3969274B2 (en) * | 2001-12-03 | 2007-09-05 | 株式会社デンソー | Gas sensor element and manufacturing method thereof |
-
2004
- 2004-06-05 DE DE200410027633 patent/DE102004027633A1/en not_active Withdrawn
-
2005
- 2005-04-27 WO PCT/EP2005/051899 patent/WO2005121763A1/en active Application Filing
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8906214B2 (en) | 2003-02-10 | 2014-12-09 | Robert Bosch Gmbh | Contamination-resistant gas sensor element |
WO2009006290A1 (en) * | 2007-06-29 | 2009-01-08 | Robert Bosch Corporation | Contamination-resistant gas sensor element |
US8198190B2 (en) | 2007-10-31 | 2012-06-12 | Globalfoundries Inc. | Semiconductor device and method for patterning vertical contacts and metal lines in a common etch process |
CN101264913B (en) * | 2008-04-03 | 2010-10-06 | 苏州大学 | Fast preparation method for coralloid nano alpha-Al2O3 |
Also Published As
Publication number | Publication date |
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WO2005121763A1 (en) | 2005-12-22 |
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