WO2005121763A1 - Sensor for determining the oxygen concentration in internal combustion engines - Google Patents
Sensor for determining the oxygen concentration in internal combustion engines Download PDFInfo
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- 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
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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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- 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.
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Abstract
Description
Messfühler zur Bestimmung der Sauerstoffkonzentration im Abgas von BrennkraftaaschinenSensor for determining the oxygen concentration in the exhaust gas of internal combustion engines
Stand der TechnikState of the art
Die Erfindung geht aus von einem Messfühler zur Bestimmung der Sauerstoffkonzentration im Abgas von Brennkraftmaschinen, nach dem Oberbegriff des Anspruchs 1.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.
Bei einem bekannten elektrochemischen Messfühler zur Bestimmung des Sauerstoffgehalts in Abgasen von Brennkrafmiaschinen oder Verbrennungsmotoren (DE 3000993 AI) besteht das durch Schweißen oder mittels eines Schraubgewindes an dem Fuhlergehause befestigte Schutzrohr, das mit einem Abstand von 0,01 bis 20mm um den gassensitiven Vorstehabschnitt des Sensorelements angeordnet ist, aus einem porösen Sintermaterial. Dadurch wird erreicht, dass nicht mehr der gesamte Abgasstrom, sondern nur noch ein Teil davon durch die Poren des Schutzrohrs hindurch an das Sensorelement gelangt. Die Größe und die Geschwindigkeit des Abgasstromes, der auf das Sensorelement trifft, lässt sich durch Variation der Wandstärke des Schutzrohrs und der Porengröße des Sintermaterials einstellen. Das Sintermaterial verhindert eine Inaktivierung des Sensorelements infolge 'Vergiftung" mit Schwefel- oder phosphorhaltigen Verbindungen sowie Blei, die im Abgas enthalten sind. Außerdem hält das Sintermaterial-Schutzrohr Druck- und Temperaturschocks von dem Sensorelement fern und bewirkt eine Vergleichmäßigung der Temperatur am Sensorelement. Als Sintermaterial werden poröse keramische Materialien wie Sillimanit, Codierit, Silika, Korund, Forsterit eingesetzt.In a known electrochemical sensor for determining the oxygen content in exhaust gases from internal combustion engines or internal combustion engines (DE 3000993 AI) 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. In addition, 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.
Vorteile der ErfindungAdvantages of the 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 Se sorelements angeordneten Außenele trode 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 auftriffl.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.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Messfühlers möglich.Advantageous further developments and improvements of the sensor specified in claim 1 are possible through the measures listed in the further claims.
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 Granulate angepasst wird oder die Gasdurchtrittslöcher mit einem Netz versehen werden, deren Maschenweite kleiner ist als die Korngröße des Granulats.According to a preferred embodiment of the invention, the measuring space is completely filled with the absorption material in the form of granules. In terms of production technology, 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.
Gemäß einer vorteuhaften 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 an advantageous embodiment of the invention, in the case of such a granulate filling of the measuring space, a granulate made of gamma or delta aluminum oxide, zeolite or boehmite is used as the absorption material.
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 an advantageous embodiment of the invention, the absorption material has a porous, coral or sponge-like structure. This enables greater mechanical stability of the sensor to be achieved.
Gemäß einer vorteilhaften Ausführungsform der Erfindung wird eine solche Struktur durch Einbringen einer Paste aus gamma-Aluminiumoxid (γ-AUOa) und weiteren Zuschlägen, Porenbildnern und organischen Bindern in den Messraum und anschließendes Einbrennen hergestellt, wobei die Einbrenntemperatur größer 800°C ist. ZeichnungAccording to an advantageous embodiment of the invention, such a structure is produced by introducing a paste of gamma-aluminum oxide (γ-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
Die Erfindung ist anhand von in der Zeichnung dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert. Es zeigen:The invention is explained in more detail in the following description with reference to exemplary embodiments shown in the drawing. Show it:
Fig. 1 bis 3 jeweils ausschnittweise einen Längsschnitt eines Messfühlers zur Bestimmung der Sauerstoffkonzentration im Abgas einer Brennlαraftmaschine gemäß dreier Ausführungsbeispiele1 to 3 each show a detail of a longitudinal section of a sensor for determining the oxygen concentration in the exhaust gas of an internal combustion engine according to three exemplary embodiments
Beschreibung der AusführungsbeispieleDescription of the embodiments
Der in Fig. 1 im Längsschnitt ausschnittweise mit seinem Messbereich dargestellte Messfühler zur Bestimmung der Sauerstoffkonzentration im Abgas von Brennkraftanaschinen weist ein Fühlergehäuse 10 auf, das für den Einbau in ein Abgasrohr der Brennkraftmaschine mit einem Einschraubgewinde 11 versehen ist. Im Fühlergehäuse 10 ist ein Sensorelement 12 aufgenommen, das mit einem gassensitiven Abschnitt 121 aus dem Fühlergehäuse 10 axial vorsteht. Zum Schutz des Sensorelements 12 gegen mechanische Beschädigung ist der Vorstehabschnitt 121 von einem kappenförmigen Schulzrohr 13 überdeckt, das am Fühlergehäuse 10 z.B. durch Schweißen befestigt ist Das mit Gasdurchtrittelöchern 14 versehene Scfautzrohr 13 schließt dabei einen den Vorstehabschnitt 121 umgebenden Messraum 15 ein, der über die Gasdurchtrittslöcher 14 mit dem Abgasstrom der Brennkraftmaschine in Gasaustauschverbindung steht. Im Messraum 15 ist ein den gassensitiven Vorstehabschnitt 121 des Sensorelements 12 umgebendes, poröses, reaktionsfähiges keramisches Absorptionsmaterial 16 zum physika- lischen und/oder chemischen Binden von für das Sensorelement 12 schädlichen Bestandteilen, die im Abgas enthalten sind, wie Silizium-, Phosphor-, Schwefel- und/oder Bor-Verbindungen, angeordnet. Das Absorptionsmaterial füllt dabei den Messraum 15 vollständig aus.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. To protect the sensor element 12 against mechanical damage, 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. In 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.
Im Ausführungsbeispiel der Fig. 1 ist das keramische Absorptionsmaterial 16 als Granulat in den Messraum 15 eingefüllt, das aus gamma- oder delta-AIuminiumoxid, Zeolith oder Boehemit besteht. Das keramische Absorptionsmaterial verhindert durch die physikalische Bindung oder chemische Umsetzung der genannten Abgasbestandteile, dass diese für das Sensorelement 10 schädlichen Bestandteile an den gassensitiven Vorstehabschnitt 121 des Sensorelements 12 gelangen und dort durch Ablagerung oder chemischen Reaktionen eine sog. Vergiftung des Sensorelements 12 verursachen, die einen Funktionsausfall oder eine schleichende Funkttonsdrift des Messfühlers über dessen Einsatzdauer bewirkt. Außerdem wird im porösen Absorptionsmaterial 16 im Abgas enthaltene Feuchtigkeit gebunden, so dass keine Kondenswassertropfen auf den heißen gassensitiven Vorstehäbschnitt 121 des Sensorelements 12 gelangen und dort einen Thermoschock auslösen kann, was zu Rissen im Sensorelement 12 und ebenfalls zum Funktionsausfall des Messfühlers führt. Durch das im Messraum 15 angeordnete, dem Sensorelement 12 unmittelbar vorgelagerte, keramische Absorptionsmaterial 16 wird insgesamt die Robustheit des Messfühlers erhöht und seine Lebensdauer vergrößert.In the exemplary embodiment in FIG. 1, 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. In addition, 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. As a result of 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.
Der in Fig.2 dargestellte Messfühler unterscheidet sich von dem in Fig. 1 dargestellten Messfühler insoweit, als anstelle des Schutzrohrs 13 ein haübenförmiges Doppelschutzrohr 17 den gassensitiven Vorstehabschnitt 121 des Sensorelements 12 überdeckt und an dem Fühlergehäuse 10 befestigt ist. Das Doppelschutzrohr 17 besteht aus einem Innenschutzrohr 18 und einem Außenschutzrohr 19, in denen jeweils Gasdurchtrittslöcher 20 bzw.21 vorhanden sind. Wie bei dem Messfühler in Fig. 1 ist auch bei dem Messfühler gemäß Fig. 2 der von dem Innenschutzrohr 18 eingeschlossene Messraum 15 vollständig mit dem porösen, reaktionsfähigen, keramischen Absorptionsmaterial 16 ausgefüllt, das anders als in Fig. 1 nicht aus Granulat besteht, sondern eine extrem poröse, korallen- oder schwammartige Struktur aufweist. Diese Struktur wird dadurch erreicht, das eine Paste aus ganama-AIuniiniumoxid (γ-Al 03) und weiteren Zuschlägen aus Magnesiumoxid (MgO), Magnesium-Titanoxid (MgTi03) oder Lithiumoxid (Li203) und Porenbüdnern, z.B. Carbonaten mit Mg, Li, und organischen Bindern in den Messraum 15 eingebracht und anschließend eingebrannt wird, wobei die Einbrenntemperatur größer 700°C ist.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. As with the sensor in FIG. 1, in the sensor according to FIG. 2, 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 (γ-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.
Das in Fig. 3 dargestellte Ausführungsbeispiel des Messfühlers unterscheidet sich von dem in Fig. 1 dargestellten Ausführungsbeispiel dadurch, dass das im Messraum 15 vorhandene, keramische Absorptionsmaterial 16 in Form einer Keramikhülse 22 mit nur geringem Spiel auf den gassensitiven Abschnitt 121 des Sensorelements 12 aufgeschoben ist. Die Hülse 22 kann dabei stirnseitig offen oder - wie in Fig.3 dargestellt - stirnseitig mit einem Hülsenboden versehen sein. Das Absorptionsmaterial 16 bzw. die aus diesem Absorptionsmaterial 16 gefertigte Hülse 22 besteht im wesentlichen aus stabilisiertem gamma- Aluminiumoxid oder Zeolith. Die Wandstärke der Hülse 22 ist so bemessen, dass sowohl eine hinreichende mechanische Festigkeit als auch eine genügend große Porosität bzw. Gasdurchlässigkeit gewährleistet ist. 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.
Claims
Applications Claiming Priority (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 |
| DE102004027633.1 | 2004-06-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005121763A1 true WO2005121763A1 (en) | 2005-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2005/051899 Ceased WO2005121763A1 (en) | 2004-06-05 | 2005-04-27 | Sensor for determining the oxygen concentration in internal combustion engines |
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| Country | Link |
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| DE (1) | DE102004027633A1 (en) |
| WO (1) | WO2005121763A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103529105A (en) * | 2013-11-06 | 2014-01-22 | 惠州市富济电子材料有限公司 | Tube-type oxygen sensor testing electrodes and protective layers |
| 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 (en) * | 2013-03-28 | 2016-09-28 | 日本碍子株式会社 | Gas sensor |
| WO2023046539A1 (en) * | 2021-09-21 | 2023-03-30 | Eos Gmbh Electro Optical Systems | Sensor arrangement for a device for additive manufacturing, device for additive manufacturing, and test method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009006290A1 (en) * | 2007-06-29 | 2009-01-08 | Robert Bosch Corporation | Contamination-resistant gas sensor element |
| DE102007052049B4 (en) | 2007-10-31 | 2020-06-18 | Globalfoundries Dresden Module One Limited Liability Company & Co. Kg | Process for structuring vertical contacts and metal lines in a common etching process |
| CN101264913B (en) * | 2008-04-03 | 2010-10-06 | 苏州大学 | Rapid Preparation Method of Coral-like Nano α-Al2O3 |
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| US5707504A (en) * | 1995-01-19 | 1998-01-13 | Nippondenso Co., Ltd. | Oxygen concentration detector |
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- 2004-06-05 DE DE200410027633 patent/DE102004027633A1/en not_active Withdrawn
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2005
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| 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 (en) * | 2013-03-28 | 2016-09-28 | 日本碍子株式会社 | Gas sensor |
| CN103529105A (en) * | 2013-11-06 | 2014-01-22 | 惠州市富济电子材料有限公司 | Tube-type oxygen sensor testing electrodes and protective layers |
| 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 |
| WO2023046539A1 (en) * | 2021-09-21 | 2023-03-30 | Eos Gmbh Electro Optical Systems | Sensor arrangement for a device for additive manufacturing, device for additive manufacturing, and test method |
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| Publication number | Publication date |
|---|---|
| DE102004027633A1 (en) | 2006-01-05 |
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