WO1996012178A1 - Gas sensor, especially for internal combustion engine exhaust gases - Google Patents

Gas sensor, especially for internal combustion engine exhaust gases Download PDF

Info

Publication number
WO1996012178A1
WO1996012178A1 PCT/DE1995/001306 DE9501306W WO9612178A1 WO 1996012178 A1 WO1996012178 A1 WO 1996012178A1 DE 9501306 W DE9501306 W DE 9501306W WO 9612178 A1 WO9612178 A1 WO 9612178A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas sensor
housing
sealing body
fuel
powder
Prior art date
Application number
PCT/DE1995/001306
Other languages
German (de)
French (fr)
Inventor
Helmut Weyl
Romuald Fries
Johann Wehrmann
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
Priority to EP95931902A priority Critical patent/EP0739481A1/en
Publication of WO1996012178A1 publication Critical patent/WO1996012178A1/en

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
    • 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
    • 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
    • G01N27/4078—Means for sealing the sensor element in a housing

Definitions

  • Gas sensor in particular for exhaust gases from internal combustion engines
  • the invention is based on a gas sensor according to the preamble of the main claim.
  • a gas sensor is from the
  • DE-OS 32 06 903 (US 4,818,363) is known, in which a planar sensor element is fixed in a longitudinal bore of a housing with two electrically insulating molded parts arranged one above the other. Between the molded parts, the sensor element is surrounded by an electrically insulating powder, which is kept pressed together by means of a spring element.
  • the powder consists of talc and forms a seal for the sensor element within the housing, the seal separating a measurement gas space and a reference gas space for the sensor element.
  • the sealing effect against fuel and / or fuel vapors is not sufficient, so that fuel and / or fuel vapors from the exhaust gas of the internal combustion engine can get into the reference gas space and thus falsify the sensor signal.
  • Fuel and / or fuel vapors is tightly sealed.
  • a suitable sealing and fuel-resistant powder is graphite powder.
  • the fuel-resistant powder is coated with an electrically insulating powder towards the housing.
  • An additional seal of the reference space is achieved by the arrangement of a sealing ring between the molded part on the measuring gas side and the housing. The sealing and at the same time fuel-resistant
  • the gas sensor shown is composed essentially of a metal housing 10 with a longitudinal bore 11, a planar sensor element 14 and a sealing arrangement 12 which tightly fixes the sensor element 14 in the housing 10.
  • the sensor element 14, which runs in the longitudinal direction through the longitudinal bore 11, has a measuring gas side Section 15 and a connection-side section 16.
  • the measuring gas side section 15 is surrounded by a protective tube 18 which has inlet and outlet openings 19 for the measuring gas.
  • the connection-side section 16 of the sensor element 14 has on the surface contact surfaces, not shown, via which the electrical contact to the electrodes, not shown, and to the optionally integrated resistance heater are made.
  • the contact points are contacted with a contact plug 20 provided with connecting cables, not shown.
  • connection-side section 16 of the sensor element 14 is surrounded by a metal sleeve 21, which protects the connection-side section 16 of the sensor element 14 from environmental influences.
  • the metal sleeve 21 forms in the interior a reference gas space 22 for the sensor element 14, which is connected to the atmosphere.
  • the housing 10 is screwed, for example, into the exhaust pipe of an internal combustion engine, so that the measuring gas side section 15 of the sensor element 14 is exposed to the exhaust gas of the internal combustion engine.
  • the sealing arrangement 12 comprises a molded part 24 on the connection side, a molded part 25 on the measuring gas side, a first sealing body 26 and a second sealing body 27.
  • the molded parts 24, 25 consist of an electrically insulating ceramic material, such as aluminum oxide.
  • the molded parts 24, 25 are arranged within the longitudinal bore 11 and each have a centrally arranged, continuous opening 28 in which the sensor element 14 is guided.
  • the sealing bodies 26, 27 are arranged between the two molded parts 24 and 25.
  • the first sealing body 26 consists, for example, of graphite powder or flake-shaped graphite powder which is introduced around the sensor element 14. Since the graphite powder of the first sealing body 26 is electrically conductive, the second one
  • Sealing body 27 placed around the first sealing body 26.
  • the first sealing body 26 is encased toward the housing 10 with an electrically insulating ceramic powder, which forms the second sealing body 27.
  • Aluminum oxide or steatite, for example, is suitable as the insulating powder for the second sealing body 27.
  • the metal housing 10 is designed with an oblique shoulder 31.
  • the measuring gas-side molded part 25 sits on the shoulder 31 with a shoulder-shaped support 33.
  • a metal sealing ring 32 is arranged between the shoulder 31 and the support 33, the metal sealing ring consisting of a CrNi alloy with an approximately 10 ⁇ m thick copper coating.
  • the graphite powder of the first sealing body 26 ensures, in addition to the sealing against the gas components carried in the exhaust gas, a sealing effect against fuel and / or fuel vapors.
  • the sealing ring 32 additionally seals the molded part 25 on the measuring gas side
  • Metal housing 10 down. This ensures that no fuel and / or no fuel vapors can or can get into the reference gas space along the lateral surface of the molded part 25 via the second sealing body 27.
  • the two molded parts 24, 25 are held on the housing 10 by means of a fastening element 34.
  • a fastening element 34 which engages behind the housing 10 with latching elements, a force is applied to the connection-side molded part 24, as a result of which
  • Graphite powder of the first sealing body 26 and the insulating ceramic powder of the second sealing body 27 are pressed together. As a result, the graphite powder of the first sealing body 26 lies tightly around the sensor element 14 and the insulating ceramic powder of the second sealing body 27 is pressed against the longitudinal bore 11 of the metal housing 10.
  • the dimensions of the molded parts 24, 25 are chosen so that the location of the sealing body 26, 27 is at a distance from the exhaust gas, so that the maximum temperatures occurring there during operation of the gas sensor are below the transition temperature of the fuel-resistant powder. This ensures that the tightness against fuel and / or fuel vapors is maintained over the entire operating life of the gas sensor.

Abstract

The proposal is for a gas sensor, especially for internal combustion engine exhaust gases, with a planar sensor component (14) secured in a longitudinal bore (11) of a housing (10) of two superimposed electrically insulating mouldings (24, 25). Between the mouldings (24, 25) there is a first seal (26) tightly surrounding the sensor component (10) which is surrounded in turn by a second seal (27) on the side of the housing (10). The first seal consists of a fuel-resistant powder, e.g. graphite. The second seal (27) consists of an electrically insulating ceramic powder, e.g. aluminium oxide.

Description

Gassensor, insbesondere für Abgase von BrennkraftmaschinenGas sensor, in particular for exhaust gases from internal combustion engines
Stand der TechnikState of the art
Die Erfindung geht aus von einem Gassensor nach der Gattung des Hauptanspruchs. Ein derartiger Gassensor ist aus derThe invention is based on a gas sensor according to the preamble of the main claim. Such a gas sensor is from the
DE-OS 32 06 903 (US 4 818 363) bekannt, bei dem ein planares Sensorelement in einer Längsbohrung eines Gehäuses mit zwei übereinander angeordneten elektrisch isolierenden Formteilen fixiert ist. Zwischen den Formteilen ist das Sensorelement von einem elektrisch isolierenden Pulver umgeben, welches mittels eines Federelements zusammengepreßt gehalten wird. Das Pulver besteht aus Talkum und bildet innerhalb des Gehäuses eine Dichtung für das Sensorelement, wobei die Dichtung einen Meßgasraum und einen Referenzgasraum für das Sensorelement voneinander trennt. Die Dichtwirkung gegenüber Kraftstoff und/oder Kraftstoffdämpfen ist jedoch nicht ausreichend, so daß Kraftstoff und/oder Kraftstoffdämpfe aus dem Abgas der Brennkraftmaschine in den Referenzgasräum gelangen können und damit das Sensorsignal verfälschen. Vorteile der ErfindungDE-OS 32 06 903 (US 4,818,363) is known, in which a planar sensor element is fixed in a longitudinal bore of a housing with two electrically insulating molded parts arranged one above the other. Between the molded parts, the sensor element is surrounded by an electrically insulating powder, which is kept pressed together by means of a spring element. The powder consists of talc and forms a seal for the sensor element within the housing, the seal separating a measurement gas space and a reference gas space for the sensor element. However, the sealing effect against fuel and / or fuel vapors is not sufficient, so that fuel and / or fuel vapors from the exhaust gas of the internal combustion engine can get into the reference gas space and thus falsify the sensor signal. Advantages of the invention
Der erfindungsgemäße Gassensor mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß der Referenzgasraum des Sensorelements gegenüberThe gas sensor according to the invention with the characterizing features of the main claim has the advantage that the reference gas space of the sensor element opposite
Kraftstoff und/oder Kraftstoffdämpfen dicht abgeschlossen ist.Fuel and / or fuel vapors is tightly sealed.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des imThe measures listed in the dependent claims are advantageous further developments and improvements in
Hauptanspruch angegebenen Gassensors möglich. Ein geeignetes dichtendes und kraftstoffbeständiges Pulver ist Graphitpulver. Zur Erzielung einer ausreichend guten Potentialfreiheit des Sensorelements gegenüber dem Gehäuse ist es zweckmäßig, wenn das kraftstoffbeständige Pulver zum Gehäuse hin mit einem elektrisch isolierenden Pulver ummantelt ist. Eine zusätzliche Abdichtung des Referenzraumes wird durch die Anordnung eines Dichtrings zwischen dem meßgasseitigen Formteil und dem Gehäuse erzielt. Die dichtende und zugleich kraftstoffbeständigeMain claim specified gas sensor possible. A suitable sealing and fuel-resistant powder is graphite powder. To achieve a sufficiently good potential freedom of the sensor element with respect to the housing, it is expedient if the fuel-resistant powder is coated with an electrically insulating powder towards the housing. An additional seal of the reference space is achieved by the arrangement of a sealing ring between the molded part on the measuring gas side and the housing. The sealing and at the same time fuel-resistant
Wirkung des Pulvers wird dadurch gewährleistet, wenn der Ort des Pulvers derart angeordnet wird, daß die an diesem Ort während des Betriebs des Gassensors auftretenden Temperaturen unterhalb der Umwandlungstemperatur des verwendeten kraftstoffbeständigen Pulvers liegt.Effect of the powder is ensured if the location of the powder is arranged such that the temperatures occurring at this location during operation of the gas sensor are below the transition temperature of the fuel-resistant powder used.
AusführungsbeispielEmbodiment
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt einen Längsschnitt eines erfindungsgemäßen Gassensors. AusführungsbeispielAn embodiment of the invention is shown in the drawing and explained in more detail in the following description. The single figure shows a longitudinal section of a gas sensor according to the invention. Embodiment
Der dargestellte Gassensor setzt sich im wesentlichen zusammen aus einem Metallgehäuse 10 mit einer Längsbohrung 11, einem planaren Sensorelement 14 und einer das Sensorelement 14 im Gehäuse 10 dicht fixierenden Dichtanordnung 12. Das Sensorelement 14 , welches in Längsrichtung durch die Längsbohrung 11 verläuft, besitzt einen meßgasseitigen Abschnitt 15 und einen anschlußseitigen Abschnitt 16.The gas sensor shown is composed essentially of a metal housing 10 with a longitudinal bore 11, a planar sensor element 14 and a sealing arrangement 12 which tightly fixes the sensor element 14 in the housing 10. The sensor element 14, which runs in the longitudinal direction through the longitudinal bore 11, has a measuring gas side Section 15 and a connection-side section 16.
Der meßgasseitige Abschnitt 15 ist von einem Schutzrohr 18 umgeben, welches Ein- und Auslaßδffnungen 19 für das Meßgas aufweist. Der anschlußseitige Abschnitt 16 des Sensorelements 14 hat an der Oberfläche nicht näher dargestellte Kontaktflächen, über die die elektrische Kontaktierung zu den nicht näher dargestellten Elektroden und zu den gegebenenfalls integrierten Widerstandsheizer hergestellt werden. Die Kontaktstellen sind mit einem mit nicht dargestellten Anschlußkabeln versehenen Kontaktstecker 20 kontaktiert.The measuring gas side section 15 is surrounded by a protective tube 18 which has inlet and outlet openings 19 for the measuring gas. The connection-side section 16 of the sensor element 14 has on the surface contact surfaces, not shown, via which the electrical contact to the electrodes, not shown, and to the optionally integrated resistance heater are made. The contact points are contacted with a contact plug 20 provided with connecting cables, not shown.
Der anschlußseitige Abschnitt 16 des Sensorelements 14 ist von einer Metallhülse 21 umgeben, die den anschlußseitigen Abschnitt 16 des Sensorelements 14 vor Umgebungseinflüssen schützt. Die Metallhülse 21 bildet im Inneren einen Referenzgasraum 22 für das Sensorelement 14, der mit der Atmosphäre in Verbindung steht.The connection-side section 16 of the sensor element 14 is surrounded by a metal sleeve 21, which protects the connection-side section 16 of the sensor element 14 from environmental influences. The metal sleeve 21 forms in the interior a reference gas space 22 for the sensor element 14, which is connected to the atmosphere.
Das Gehäuse 10 wird beispielsweise in das Abgasrohr einer Brennkraftmaschine eingeschraubt, so daß der meßgasseitige Abschnitt 15 des Sensorelements 14 dem Abgas der Brennkraftmaschine ausgesetzt ist. Die Dichtanordnung 12 umfaßt ein anschlußseitiges Formteil 24, ein meßgasseitiges Formteil 25, einen ersten Dichtkörper 26 und einen zweiten Dichtkörper 27. Die Formteile 24, 25 bestehen aus einem elektrisch isolierenden Keramikmaterial, wie beispielsweise Aluminiumoxid. Die Formteile 24, 25 sind innerhalb der Längsbohrung 11 angeordnet und besitzen jeweils eine zentrisch angeordnete, durchgehende Öffnung 28, in der das Sensorelement 14 geführt ist.The housing 10 is screwed, for example, into the exhaust pipe of an internal combustion engine, so that the measuring gas side section 15 of the sensor element 14 is exposed to the exhaust gas of the internal combustion engine. The sealing arrangement 12 comprises a molded part 24 on the connection side, a molded part 25 on the measuring gas side, a first sealing body 26 and a second sealing body 27. The molded parts 24, 25 consist of an electrically insulating ceramic material, such as aluminum oxide. The molded parts 24, 25 are arranged within the longitudinal bore 11 and each have a centrally arranged, continuous opening 28 in which the sensor element 14 is guided.
Die Dichtkorper 26, 27 sind zwischen den beiden Formteilen 24 und 25 angeordnet. Der erste Dichtkörper 26 besteht beispielsweise aus Graphitpulver beziehungsweise flockenfδrmigem Graphitpulver, welches um das Sensorelement 14 eingebracht ist. Da das Graphitpulver des ersten Dichtkδrpers 26 elektrisch leitend ist, ist der zweiteThe sealing bodies 26, 27 are arranged between the two molded parts 24 and 25. The first sealing body 26 consists, for example, of graphite powder or flake-shaped graphite powder which is introduced around the sensor element 14. Since the graphite powder of the first sealing body 26 is electrically conductive, the second one
Dichtkörper 27 um den erste Dichtkorper 26 gelegt. Dabei wird der erste Dichtkorper 26 zum Gehäuse 10 hin mit einem elektrisch isolierenden keramischen Pulver ummantelt, welches den zweiten Dichtkorper 27 bildet. Als isolierendes Pulver für den zweiten Dichtkorper 27 eignet sich beispielsweise Aluminiumoxid oder Steatit.Sealing body 27 placed around the first sealing body 26. The first sealing body 26 is encased toward the housing 10 with an electrically insulating ceramic powder, which forms the second sealing body 27. Aluminum oxide or steatite, for example, is suitable as the insulating powder for the second sealing body 27.
Das Metallgehäuse 10 ist mit einer schräg verlaufenden Schulter 31 ausgeführt. Auf der Schulter 31 sitzt das meßgasseitige Formteil 25 mit einer schulterförmigen Auflage 33 auf. Zwischen der Schulter 31 und der Auflage 33 ist ein Metalldichtring 32 angeordnet, wobei der Metalldichtring aus einer CrNi-Legierung mit einer etwa 10 μm starken Kupferbeschichtung besteht.The metal housing 10 is designed with an oblique shoulder 31. The measuring gas-side molded part 25 sits on the shoulder 31 with a shoulder-shaped support 33. A metal sealing ring 32 is arranged between the shoulder 31 and the support 33, the metal sealing ring consisting of a CrNi alloy with an approximately 10 μm thick copper coating.
Das Graphitpulver des ersten Dichtkδrpers 26 gewährleistet neben der Abdichtung gegenüber den im Abgas mitgeführten Gaskomponenten eine Dichtwirkung gegenüber Kraftstoff und/oder Kraftstoffdämpfen. Der eingesetzte Dichtring 32 dichtet zusätzlich das meßgasseitige Formteil 25 zumThe graphite powder of the first sealing body 26 ensures, in addition to the sealing against the gas components carried in the exhaust gas, a sealing effect against fuel and / or fuel vapors. The sealing ring 32 additionally seals the molded part 25 on the measuring gas side
Metallgehäuse 10 hin ab. Damit wird gewährleistet, daß entlang der Mantelfläche des Formteils 25 über den zweiten Dichtkorper 27 kein Kraftstoff und/oder keine Kraftstoffdämpfe in den Referenzgasraum gelangen kann beziehungsweise können.Metal housing 10 down. This ensures that no fuel and / or no fuel vapors can or can get into the reference gas space along the lateral surface of the molded part 25 via the second sealing body 27.
Die beiden Formteile 24, 25 werden mittels eines Befestigungselements 34 am Gehäuse 10 gehalten. Mit dem Befestigungselement 34, welches das Gehäuse 10 mit Rastelementen hintergreift, wird eine Kraft auf das anschlußseitige Formteil 24 aufgebracht, wodurch dasThe two molded parts 24, 25 are held on the housing 10 by means of a fastening element 34. With the fastening element 34, which engages behind the housing 10 with latching elements, a force is applied to the connection-side molded part 24, as a result of which
Graphitpulver des ersten Dichtkδrpers 26 und das isolierende Keramikpulver des zweiten Dichtkδrpers 27 zusammengepreßt werden. Dadurch legt sich das Graphitpulver des ersten Dichtkδrpers 26 dicht um das Sensorelement 14 und das isolierende Keramikpulver des zweiten Dichtkδrpers 27 wird an die Längsbohrung 11 des Metallgehäuses 10 gedrückt.Graphite powder of the first sealing body 26 and the insulating ceramic powder of the second sealing body 27 are pressed together. As a result, the graphite powder of the first sealing body 26 lies tightly around the sensor element 14 and the insulating ceramic powder of the second sealing body 27 is pressed against the longitudinal bore 11 of the metal housing 10.
Die Abmessungen der Formteile 24, 25 werden so gewählt, daß sich der Ort der Dichtkorper 26, 27 in einem Abstand vom Abgas befindet, so daß die dort maximal auftretenden Temperaturen beim Betrieb des Gassensors unter der Umwandlungstemperatur des kraftstoffbeständigen Pulvers liegen. Damit wird gewährleistet, daß die Dichtheit gegenüber Kraftstoff und/oder Kraftstoffdämpfen über die gesamte Betriebsdauer des Gassensors erhalten bleibt. The dimensions of the molded parts 24, 25 are chosen so that the location of the sealing body 26, 27 is at a distance from the exhaust gas, so that the maximum temperatures occurring there during operation of the gas sensor are below the transition temperature of the fuel-resistant powder. This ensures that the tightness against fuel and / or fuel vapors is maintained over the entire operating life of the gas sensor.

Claims

.Ansprüche .Expectations
1. Gassensor, insbesondere für Abgase von Brennkraftmaschinen, mit einem planaren Sensorelement, welches in einer Längsbohrung eines Gehäuses von wenigstens einem elektrisch isolierenden Formteil fixiert ist, und mit einer das Sensorelement umschließenden Dichtung, dadurch gekennzeichnet, daß die Dichtung von einem das Sensorelement (14) umschließenden Dichtkorper (26) aus einem kraftstoffbeständigen Pulver gebildet is .1. Gas sensor, in particular for exhaust gases from internal combustion engines, with a planar sensor element which is fixed in a longitudinal bore of a housing of at least one electrically insulating molded part, and with a seal surrounding the sensor element, characterized in that the seal is provided by a sensor element (14 ) surrounding sealing body (26) is formed from a fuel-resistant powder.
2. Gassensor nach Anspruch 1, dadurch gekennzeichnet, daß der Dichtkorper (26) zum Gehäuse (10) hin von einem weiteren Dichtkorper (27) ummantelt ist, wobei zumindest der weitere Dichtkörper (27) aus einem elektrisch isolierenen Material besteht.2. Gas sensor according to claim 1, characterized in that the sealing body (26) to the housing (10) is encased by a further sealing body (27), at least the further sealing body (27) consisting of an electrically insulating material.
3. Gassensor nach Anspruch 1, dadurch gekennzeichnet, daß der weitere Dichtkörper (27) aus einem elektrisch isolierenden Pulver gebildet ist.3. Gas sensor according to claim 1, characterized in that the further sealing body (27) is formed from an electrically insulating powder.
4. Gassensor nach Anspruch 3, dadurch gekennzeichnet, daß das elektrisch isolierende Pulver Aluminiumoxid oder Steatit ist.4. Gas sensor according to claim 3, characterized in that the electrically insulating powder is aluminum oxide or steatite.
5. Gassensor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das kraftstoffbeständige Pulver Graphit ist. 5. Gas sensor according to claim 1 or 2, characterized in that the fuel-resistant powder is graphite.
6. Gassensor nach Anspruch 1, dadurch gekennzeichnet, daß zwischen dem Gehäuse (10) und dem meßgasseitigen Formteil (25) ein Dichtring (32) angeordnet ist.6. Gas sensor according to claim 1, characterized in that a sealing ring (32) is arranged between the housing (10) and the measuring gas-side molded part (25).
7. Gassensor nach Anspruch 6, dadurch gekennzeichnet, daß der Dichtring (32) ein beschichteter Metalldichtring ist.7. Gas sensor according to claim 6, characterized in that the sealing ring (32) is a coated metal sealing ring.
8. Gassensor nach Anspruch 1, dadurch gekennzeichnet, daß der Dichtkorper (26) innerhalb des Gehäuses an einer Stelle angeordnet ist, an der während des Betriebs des Gassensors Temperaturen vorliegen, die unterhalb der Umwandlungstemperatur des kraftstoffbeständigen Pulvers liegen. 8. Gas sensor according to claim 1, characterized in that the sealing body (26) is arranged within the housing at a point at which temperatures during operation of the gas sensor are below the transition temperature of the fuel-resistant powder.
PCT/DE1995/001306 1994-10-13 1995-09-22 Gas sensor, especially for internal combustion engine exhaust gases WO1996012178A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95931902A EP0739481A1 (en) 1994-10-13 1995-09-22 Gas sensor, especially for internal combustion engine exhaust gases

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4436580.2 1994-10-13
DE19944436580 DE4436580A1 (en) 1994-10-13 1994-10-13 Gas sensor, in particular for exhaust gases from internal combustion engines

Publications (1)

Publication Number Publication Date
WO1996012178A1 true WO1996012178A1 (en) 1996-04-25

Family

ID=6530665

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001306 WO1996012178A1 (en) 1994-10-13 1995-09-22 Gas sensor, especially for internal combustion engine exhaust gases

Country Status (3)

Country Link
EP (1) EP0739481A1 (en)
DE (1) DE4436580A1 (en)
WO (1) WO1996012178A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102707018A (en) * 2012-06-17 2012-10-03 无锡隆盛科技股份有限公司 Gas sensor
CN104422728A (en) * 2013-08-27 2015-03-18 浙江福爱电子有限公司 Oxygen sensor packaging structure
JP2019191197A (en) * 2015-09-30 2019-10-31 日本碍子株式会社 Gas sensor

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19707459A1 (en) 1997-02-25 1998-08-27 Bosch Gmbh Robert Seal for a sensor element of a sensor
JP4433429B2 (en) * 1998-07-29 2010-03-17 本田技研工業株式会社 Oxygen sensor
DE19852674A1 (en) 1998-11-16 2000-05-18 Bosch Gmbh Robert Seal for a sensor element of a gas sensor and method for producing the seal
DE19937160C2 (en) * 1999-08-06 2003-07-10 Bosch Gmbh Robert Gas sensor, in particular for exhaust gases from internal combustion engines, and method for its production
DE10060027A1 (en) * 2000-12-01 2002-06-13 Epiq Sensor Nite N V Sealing arrangement for a temperature or gas sensor
DE10127917C1 (en) 2001-06-08 2002-12-12 Bosch Gmbh Robert Gas sensor used as lambda sensor in IC engines comprises housing with sealing packing holding ceramic sensor body having coating made from electrically insulating material
JP4030351B2 (en) 2001-06-20 2008-01-09 株式会社デンソー Gas sensor
DE10220478A1 (en) 2002-05-07 2003-11-27 Framatome Anp Gmbh Electrical implementation and use of the electrical implementation
JP2006064425A (en) 2004-08-25 2006-03-09 Yamaha Marine Co Ltd Exhaust gas sensor
CN104020211B (en) * 2014-06-16 2017-08-15 深圳市普利斯通传感科技有限公司 A kind of lambda sensor and manufacture method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2504206A1 (en) * 1975-02-01 1976-08-05 Bosch Gmbh Robert ELECTROCHEMICAL SENSOR FOR DETERMINING THE OXYGEN CONTENT IN EXHAUST GASES, IN PARTICULAR IN EXHAUST GASES FROM COMBUSTION ENGINES
DE3206903A1 (en) * 1982-02-26 1983-09-15 Bosch Gmbh Robert GAS SENSOR, ESPECIALLY FOR EXHAUST GAS FROM COMBUSTION ENGINES
DE3922331A1 (en) * 1989-07-07 1991-01-17 Bosch Gmbh Robert GAS DETECTOR

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2504206A1 (en) * 1975-02-01 1976-08-05 Bosch Gmbh Robert ELECTROCHEMICAL SENSOR FOR DETERMINING THE OXYGEN CONTENT IN EXHAUST GASES, IN PARTICULAR IN EXHAUST GASES FROM COMBUSTION ENGINES
DE3206903A1 (en) * 1982-02-26 1983-09-15 Bosch Gmbh Robert GAS SENSOR, ESPECIALLY FOR EXHAUST GAS FROM COMBUSTION ENGINES
DE3922331A1 (en) * 1989-07-07 1991-01-17 Bosch Gmbh Robert GAS DETECTOR

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102707018A (en) * 2012-06-17 2012-10-03 无锡隆盛科技股份有限公司 Gas sensor
CN104422728A (en) * 2013-08-27 2015-03-18 浙江福爱电子有限公司 Oxygen sensor packaging structure
JP2019191197A (en) * 2015-09-30 2019-10-31 日本碍子株式会社 Gas sensor

Also Published As

Publication number Publication date
DE4436580A1 (en) 1996-04-18
EP0739481A1 (en) 1996-10-30

Similar Documents

Publication Publication Date Title
WO1996012178A1 (en) Gas sensor, especially for internal combustion engine exhaust gases
EP2312290B1 (en) Pressure sensor and use of same in a fluid tank
DE2942494C2 (en)
EP0824694B1 (en) Gas sensor
EP0133486B1 (en) Gas sensor
DE69935896T3 (en) Compact structure of a gas sensor and its production method
DE19532090C2 (en) Seal for a sensor element of a gas sensor
DE3537051C2 (en)
EP0701692A1 (en) Gas-line sensor
DE2937048A1 (en) ELECTROCHEMICAL PROBE FOR DETERMINING THE OXYGEN CONTENT IN GAS, ESPECIALLY IN EXHAUST GAS FROM COMBUSTION ENGINE
DE102005015103A1 (en) Particle sensor and method of operating the same
DE10151291B4 (en) gas sensor
EP0168589A1 (en) Oxygen sensor
DE4126378A1 (en) Gas measuring sensor for oxygen content in exhaust gases - has contact portion support and plug counterwall, whose front sides face large sensor surface
DE19740363A1 (en) Lambda probe gas sensor for detecting substances in motor vehicle exhaust gas
EP0164530B1 (en) Oxygen sensor
DE10220783B4 (en) probe
WO1996021148A1 (en) Electrochemical sensor probe
DE7812745U1 (en) ELECTRONIC SENSOR FOR DETERMINING THE OXYGEN CONTENT IN THE EXHAUST GASES FROM COMBUSTION ENGINES
DE102007000168A1 (en) Improved structure of gas sensor ensuring enhanced mechanical durability
DE2350253C3 (en) Electrochemical probe
DE102016224410A1 (en) Sensor for use in an exhaust gas stream of an internal combustion engine and method for producing the same
DE3226603A1 (en) Method and system for measuring the oxygen concentration
DE19705623C2 (en) Gas sensor
DE4207676A1 (en) DEVICE FOR MEASURING THE DIMENSION OF A FLOWING MEDIUM

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 1995931902

Country of ref document: EP

AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWP Wipo information: published in national office

Ref document number: 1995931902

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1995931902

Country of ref document: EP