EP0858599A1 - Gas-permeable connecting lead for a probe - Google Patents

Gas-permeable connecting lead for a probe

Info

Publication number
EP0858599A1
EP0858599A1 EP97935474A EP97935474A EP0858599A1 EP 0858599 A1 EP0858599 A1 EP 0858599A1 EP 97935474 A EP97935474 A EP 97935474A EP 97935474 A EP97935474 A EP 97935474A EP 0858599 A1 EP0858599 A1 EP 0858599A1
Authority
EP
European Patent Office
Prior art keywords
housing
gas
sensor according
cable insulation
cable
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.)
Withdrawn
Application number
EP97935474A
Other languages
German (de)
French (fr)
Inventor
Karl-Hermann Friese
Helmut Weyl
Anton Hans
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 EP0858599A1 publication Critical patent/EP0858599A1/en
Withdrawn legal-status Critical Current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
    • 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
    • G01N27/4075—Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts
    • G01N27/4076—Reference electrodes or reference mixtures

Definitions

  • the invention relates to a sensor, in particular for determining the oxygen content in exhaust gases from internal combustion engines, according to the preamble of
  • a generic sensor is known for example from DE-OS 27 02 432, in which the reference air is introduced into the housing via the connection cable, the cavities present within the insulation of the connection cable not always being sufficient to provide sufficient reference air into the interior of the housing of the sensor. Please note that this reference air must be replaced regularly, ie it must be in contact with the ambient air. On the other hand, for an unadulterated measurement result, it is imperative that the reference air not with the exhaust gas to be measured, or z. B. comes into contact with dirt, water, oil or petrol from the ambient air.
  • the connection of the reference air with the ambient air is according to the current state of the art via the cable core, ie via the internal strand of the measuring cable, for. B. from the control unit.
  • the insulation jacket of the measuring cable when passing the cable into the measuring probe with the Housing must be absolutely sealed. The aforementioned cable entry is very complex because different components have to be manufactured and assembled during assembly. Accordingly, this effort is reflected in the manufacturing costs.
  • the connecting line according to the invention with the characterizing features of the main claim has the advantage that a better supply of the reference atmosphere takes place in the housing.
  • the openings in the outer surface of the cable sheath made of PTFE are dimensioned such that enough gas can pass through these gas-permeable sections into the interior of the cable sheath and from there into the housing, but on the other hand the passage of liquids such as fuel, water etc. is excluded becomes.
  • the cable insulation has openings which are encased by an additional PTFE film
  • the PTFE film having been pretreated in such a way that it has a porosity through which gas does not, however, contain any liquid or moisture or impurities can reach the housing. Due to the possible variation of the additional PTFE film by appropriate treatment, its specific permeability can advantageously be adjusted, which complicates or excludes the otherwise critical diffusion of liquid hydrocarbon compounds.
  • the additional PTFE film is advantageously shrunk onto the gas-permeable section of the PTFE line. drawing
  • FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description.
  • the single figure shows a section through a cable grommet with the connecting cable according to the invention in the installed state in a lander probe.
  • the figure shows a cross section through the connection side of a sensor 1, for example a La bda probe.
  • This connection side comprises a partially shown housing 2, in which a sensor element 20, not shown, is fixed gas-tight.
  • the grommet body 3 is located in the housing 2.
  • Two connecting cables 4, 5 pass through the grommet body 3 and are provided with crimp contacts 6, 7 at their lower end.
  • the insulation sleeves 12, 13 are positively connected to the sleeve body 3 along their entire circumference.
  • openings 17 are attached to the cable sheathing and are covered by a porous additional PTFE film 18, as a result of which a continuous air exchange channel is formed between the sensor (not shown) and the outside air.
  • temperatures between 250 and 280 ° C occur at the cable outlet.
  • Sleeve body 3 does not completely return to its original shape.
  • the groove 10 is provided with the internal Witon O-ring 11. The arrangement described is heated, for example, in an oven, the grommet body 3 and the
  • the additional porous PTFE film 18 is produced by stretching the PTFE material using a method known per se. However, it is also conceivable to make this PTFE film 18 air-permeable by laser beam bombardment or by the finest, mechanically attached needle pricks. It is also conceivable to make the PTFE material of the insulation sleeves 12, 13 porous at least in regions by stretching the material, which is known per se.

Abstract

The invention proposes a probe (1) for determining the oxygen content of exhaust fumes from internal combustion engines in particular, comprising a sensor element (20) which is disposed in a metallic housing (2) and which is in contact with connecting cables (4, 5) that lead out of the housing (2). These connecting cables (4, 5) are surrounded by an insulating sleeve (12, 13) made of PTFE. At least one part of the lateral surface of the insulating sleeve (12, 13) has a gas-permeable section (17) so that the reference atmosphere can pass through into the interior of the insulating sleeve (12, 13) and from there into the housing (2) but which also prevents penetration of liquids such as fuel, condensation water, etc. This is achieved, for example, by an additional porous PTFE-film (18) which is applied to the gas-permeable section (17).

Description

asdurchlässige Anschlußleitung für einen Meßfühler permeable connecting cable for a sensor
Stand der TechnikState of the art
Die Erfindung geht aus von einem Meßfühler, insbesondere zur Bestimmung des Sauerstoffgehaltes in Abgasen von Verbrennungsmotoren, nach dem Oberbegriff desThe invention relates to a sensor, in particular for determining the oxygen content in exhaust gases from internal combustion engines, according to the preamble of
Hauptanspruches . Ein gattungsgemäßer Meßfühler ist beispielsweise aus der DE-OS 27 02 432 bekannt, bei dem die Referenzluft über die .Anschlußkabel in das Gehäuse eingeleitet wird, wobei die innerhalb der Isolierung der Anschlußkabel vorhandenen Hohlräume nicht immer ausreichen, um genügend Referenzluft in das Innere des Gehäuses des Meßfühlers zu leiten. Hierbei ist zu beachten, daß diese Referenzluft regelmäßig erneuert werden muß, d. h. sie muß mit der Umgebungsluft in Verbindung stehen. Andererseits ist es für ein unverfälschtes Meßergebnis zwingend notwendig, daß die Referenzluft nicht mit dem zu messenden Abgas, oder aber auch z. B. mit Schmutz, Wasser, Öl oder Benzin aus der Umgebungsluft in Berührung kommt . Die Verbindung der Referenzluft mit der Umgebungsluf wird nach dem heutigen Stand der Technik über die Kabelseele, d. h. über die innenliegende Litze des Meßkabels, z. B. aus dem Steuergerät, durchgeführt. Der Isolationsmantel des Meßkabels bei der Kabeldurchführung in die Meßsonde mit dem Gehäuse muß absolut dicht abgeschlossen sein. Die genannte Kabeldurchführung ist sehr aufwendig, da verschiedene Bauelemente gefertigt und bei der Montage zusammengesetzt werden müssen. Dieser Aufwand schlägt sich dementsprechend in den Fertigungskosten nieder.Main claim. A generic sensor is known for example from DE-OS 27 02 432, in which the reference air is introduced into the housing via the connection cable, the cavities present within the insulation of the connection cable not always being sufficient to provide sufficient reference air into the interior of the housing of the sensor. Please note that this reference air must be replaced regularly, ie it must be in contact with the ambient air. On the other hand, for an unadulterated measurement result, it is imperative that the reference air not with the exhaust gas to be measured, or z. B. comes into contact with dirt, water, oil or petrol from the ambient air. The connection of the reference air with the ambient air is according to the current state of the art via the cable core, ie via the internal strand of the measuring cable, for. B. from the control unit. The insulation jacket of the measuring cable when passing the cable into the measuring probe with the Housing must be absolutely sealed. The aforementioned cable entry is very complex because different components have to be manufactured and assembled during assembly. Accordingly, this effort is reflected in the manufacturing costs.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Anschlußleitung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß eine bessere Zuführung der Referenzatmosphäre in das Gehäuse stattfindet. Die in die Mantelfläche der Kabelumhüllung aus PTFE angebrachten Öffnungen sind derart dimensioniert, daß durch diese gasdurchlässigen Abschnitte genügend Referenzluft in das Innere der Kabelumhüllung und von dort in das Gehäuse eindringen kann, andererseits aber der Durchtritt von Flüsssigkeiten, wie beispielsweise Kraftstoff, Wasser etc. ausgeschlossen wird. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der erfindungsgemäßen Anschlußleitung möglich. Fertigungstechnisch besonders günstig ist es, wenn die Kabelisolierung Öffnungen aufweist, die von einer zusätzlichen PTFE-Folie umhüllt ist, wobei die PTFE-Folie derart vorbehandelt wurde, daß sie eine Porosität aufweist, durch die zwar Gas aber keine Flüssigkeit oder Feuchtigkeit bzw. Verunreinigungen in das Gehäuse gelangen können. Aufgrund der möglichen Variation der zusätzlichen PTFE-Folie durch entsprechende Behandlung kann deren spezifische Durchlässigkeit vorteilhafterweise eingestellt werden, was die ansonsten kritische Diffusion flüssiger Kohlenwasserstoffverbindungen erschwert bzw. ausschließt. Die zusätzliche PTFE-Folie wird auf den gasdurchlässigen Abschnitt der PTFE-Leitung vorteilhafterweise aufgeschrumpft. ZeichnungThe connecting line according to the invention with the characterizing features of the main claim has the advantage that a better supply of the reference atmosphere takes place in the housing. The openings in the outer surface of the cable sheath made of PTFE are dimensioned such that enough gas can pass through these gas-permeable sections into the interior of the cable sheath and from there into the housing, but on the other hand the passage of liquids such as fuel, water etc. is excluded becomes. Advantageous further developments and improvements of the connecting line according to the invention are possible through the measures listed in the subclaims. It is particularly advantageous in terms of production technology if the cable insulation has openings which are encased by an additional PTFE film, the PTFE film having been pretreated in such a way that it has a porosity through which gas does not, however, contain any liquid or moisture or impurities can reach the housing. Due to the possible variation of the additional PTFE film by appropriate treatment, its specific permeability can advantageously be adjusted, which complicates or excludes the otherwise critical diffusion of liquid hydrocarbon compounds. The additional PTFE film is advantageously shrunk onto the gas-permeable section of the PTFE line. drawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt einen Schnitt durch eine Kabeltülle mit dem erfindungsgemäßen Anschlußkabel in eingebautem Zustand in einer Landersonde.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. The single figure shows a section through a cable grommet with the connecting cable according to the invention in the installed state in a lander probe.
AusführungsbeispielEmbodiment
Die Figur zeigt einen Querschnitt durch die Anschlußseite eines Meßfühlers 1, beispielsweise einer La bdasonde . Diese Anschlußseite umfaßt ein teilweise dargestelltes Gehäuse 2, in dem ein nicht dargestelltes Sensorelement 20 gasdicht fixiert ist. Der Tüllenkörper 3 befindet sich in dem Gehäuse 2. Zwei Anschlußkabel 4, 5 durchsetzen den Tüllenkörper 3 und sind an ihrem unteren Ende mit Crimpkontakten 6, 7 versehen. Die Isolationsmäntel 12, 13 sind formschlüssig entlang ihrem gesamten Umfang mit dem Tüllenkörper 3 verbunden. In einem Abstand L von beispielsweise 2 cm vom Gehäuse 2 entfernt sind an der Kabelumhüllung Öffnungen 17 angebracht, die von einer porösen zusätzlichen PTFE-Folie 18 abgedeckt sind, wodurch ein durchgehender Luftaustauschkanal zwischen dem nicht dargestellten Meßfühler und der Außenluft entsteht. Durch die feste Verbindung der Iεolationsmäntel 12, 13 mit dem Tüllenkorper 3 werden sämtliche Verformungen bei der Erwärmung bzw. Abkühlung des Tüllenkörpers 3 von den Iεolationsmänteln 12, 13 und dem Tüllenkörper 3 gekoppelt durchgeführt. Der Tüllenkörper 3 ist im Gehäuse 2 verstemmt, weshalb das Gehäuse 2 eine ringförmige Ausdellung 8 und der Tüllenkörper 3 ein in die Ausdellung 8 passenden Ringwulst 9 aufweist, der eine Nut 10 umfaßt. In die Nut 10 ist ein 0- Ring 11 eingelegt. Die Isolationsmäntel 12, 13 der Anschlußkabel 4, 5 liegen formschlüssig an dem Tüllenkörper 3 an, und sind fest mit diesem verbunden.The figure shows a cross section through the connection side of a sensor 1, for example a La bda probe. This connection side comprises a partially shown housing 2, in which a sensor element 20, not shown, is fixed gas-tight. The grommet body 3 is located in the housing 2. Two connecting cables 4, 5 pass through the grommet body 3 and are provided with crimp contacts 6, 7 at their lower end. The insulation sleeves 12, 13 are positively connected to the sleeve body 3 along their entire circumference. At a distance L of, for example, 2 cm from the housing 2, openings 17 are attached to the cable sheathing and are covered by a porous additional PTFE film 18, as a result of which a continuous air exchange channel is formed between the sensor (not shown) and the outside air. Due to the firm connection of the insulation sheaths 12, 13 to the grommet body 3, all deformations during the heating or cooling of the grommet body 3 are carried out in a coupled manner by the insulation sheaths 12, 13 and the grommet body 3. The grommet body 3 is caulked in the housing 2, which is why the housing 2 has an annular bulge 8 and the grommet body 3 has an annular bulge 9 which fits into the bulge 8 and comprises a groove 10. A 0-ring 11 is inserted into the groove 10. The insulation jackets 12, 13 of the Connection cables 4, 5 rest positively on the grommet body 3, and are firmly connected to it.
Im Betrieb der Lambdasonde treten an dem Kabelausgang Temperaturen zwischen 250 bis 280 ° C auf. DieDuring operation of the lambda probe, temperatures between 250 and 280 ° C occur at the cable outlet. The
Wärmeausdehnung des Tüllenkörpers 3, der aus Glasfaser gefülltem Teflon besteht, führt dazu, daß sich der Tüllenkörper 3 in axialer Richtung, d. h. in Richtung des Doppelpfeils P ausdehnt, da er durch die Metallhülse 2 radial fest umschlossen ist. Bei Abkühlung geht derThermal expansion of the sleeve body 3, which consists of glass fiber filled Teflon, leads to the fact that the sleeve body 3 in the axial direction, i. H. expands in the direction of the double arrow P since it is radially tightly enclosed by the metal sleeve 2. When it cools down, it goes
Tüllenkörper 3 nicht vollständig in seine ursprüngliche Form zurück. Um hier einen dichten Abschluß zu gewährleisten, ist die Nut 10 mit dem innen liegenden Witon-O-Ring 11 versehen. Die beschriebene Anordnung wird beispielsweise in einem Ofen erhitzt, wobei sich der Tüllenkörper 3 sowie dieSleeve body 3 does not completely return to its original shape. In order to ensure a tight seal here, the groove 10 is provided with the internal Witon O-ring 11. The arrangement described is heated, for example, in an oven, the grommet body 3 and the
Isolationsmäntel 12, 13 ausdehnen. Evtl. vorhandene Ringspalte um die Isolationsmäntel 12, 13 herum werden dabei geschlossen. Dadurch kommt nur noch über die Öffnungen 17 Gas ins Innere des nicht dargestellten Meßfühlers.Extend insulation jackets 12, 13. Possibly. Existing annular gaps around the insulation jackets 12, 13 are closed. As a result, gas only comes through the openings 17 into the interior of the sensor, not shown.
Die Herstellung der zusätzlichen porösen PTFE-Folie 18 geschieht durch Strecken des PTFE-Materials nach einem an sich bekannten Verfahren. Es ist aber ebenso denkbar, diese PTFE-Folie 18 durch Laserstrahlbeschuß oder durch feinste, mechanisch angebrachte Nadelstiche luftdurchlässig zu machen. Es ist außerdem denkbar, das PTFE-Material der Isolationsmäntel 12 , 13 durch an sich bekanntes Strecken des Matterials zumindest bereichsweise porös auszuführen. The additional porous PTFE film 18 is produced by stretching the PTFE material using a method known per se. However, it is also conceivable to make this PTFE film 18 air-permeable by laser beam bombardment or by the finest, mechanically attached needle pricks. It is also conceivable to make the PTFE material of the insulation sleeves 12, 13 porous at least in regions by stretching the material, which is known per se.

Claims

Ansprüche Expectations
1. Meßfühler, insbesondere zur Bestimmung des Sauerstoffgehaltes in Abgasen von Verbrennungsmotoren, mit einem in einem metallischen Gehäuse (2) angeordneten Sensorelement (20) , welches mit mindestens einem aus dem Gehäuse herausgeführten Anschlußkabel kontakiert ist, das eine Kabelisolierung aufweist, wobei in das Gehäuse (2) eine Referenzatmosphäre für das Sensorelement (20) einleitbar ist, dadurch gekennzeichnet, daß die Kabelisolierung (12, 13) an der Mantelfläche zumindest bereichsweise mindestens einen gasdurchlässigen Abschnitt (17) derart aufweist, daß die Referenzatmosphäre in das Innere der Kabelisolierung (12, 13) und von dort in das Gehäuse (2) gelangt.1. Sensor, in particular for determining the oxygen content in exhaust gases from internal combustion engines, with a sensor element (20) arranged in a metallic housing (2), which is contacted with at least one connection cable led out of the housing, which has a cable insulation, being in the housing (2) a reference atmosphere for the sensor element (20) can be introduced, characterized in that the cable insulation (12, 13) has at least some gas-permeable section (17) on the lateral surface in such a way that the reference atmosphere enters the interior of the cable insulation (12 , 13) and from there into the housing (2).
2. Meßfühler nach Anspruch 1, dadurch gekennzeichnet, daß der gasdurchlässige Abschnitt Öffnungen (17) aufweist, durch die die Referenzatmosphäre in das Innere der Kabelisolierung (12, 13) gelangen kann.2. Sensor according to claim 1, characterized in that the gas-permeable section has openings (17) through which the reference atmosphere can get into the interior of the cable insulation (12, 13).
3. Meßfühler nach Anspruch 2, dadurch gekennzeichnet, daß die Öffnungen (17) mindestens 1 cm außerhalb des Gehäuses3. Sensor according to claim 2, characterized in that the openings (17) at least 1 cm outside the housing
(2) angebracht sind.(2) are attached.
4. Meßfühler nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Kabelisolierung (12, 13) im Bereich der Öffnungen (17) von einer zusätzlichen gasdurchlässigen PTFE-Folie (18) umwickelt ist .4. Sensor according to claim 2 or 3, characterized in that the cable insulation (12, 13) in the region of the openings (17) is wrapped by an additional gas-permeable PTFE film (18).
5. Meßfühler nach Anspruch 4, dadurch gekennzeichnet, daß diese zusätzliche PTFE-Folie (18) porös ist. 5. Sensor according to claim 4, characterized in that this additional PTFE film (18) is porous.
6. Meßfühler nach Anspruch 5, dadurch gekennzeichnet, daß die Porosität der zusätzlichen PTFE-Folie (18) derart ausgeführt ist, daß nur der Durchtritt bzw. die Diffusion von Gasen und nicht von Flüssigkeiten, wie z. B. Kraftstoff, Kondenswasser, etc., möglich ist.6. Sensor according to claim 5, characterized in that the porosity of the additional PTFE film (18) is designed such that only the passage or diffusion of gases and not of liquids, such as. B. fuel, condensation, etc., is possible.
7. Meßfühler nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Kabelisolierung (12, 13) aus PTFE besteht . 7. Sensor according to one of the preceding claims, characterized in that the cable insulation (12, 13) consists of PTFE.
EP97935474A 1996-08-03 1997-07-24 Gas-permeable connecting lead for a probe Withdrawn EP0858599A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19631501 1996-08-03
DE19631501A DE19631501C2 (en) 1996-08-03 1996-08-03 Gas-permeable connection line for a sensor
PCT/DE1997/001562 WO1998005951A1 (en) 1996-08-03 1997-07-24 Gas-permeable connecting lead for a probe

Publications (1)

Publication Number Publication Date
EP0858599A1 true EP0858599A1 (en) 1998-08-19

Family

ID=7801777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97935474A Withdrawn EP0858599A1 (en) 1996-08-03 1997-07-24 Gas-permeable connecting lead for a probe

Country Status (6)

Country Link
US (1) US6018982A (en)
EP (1) EP0858599A1 (en)
JP (1) JPH11514092A (en)
KR (1) KR100514422B1 (en)
DE (1) DE19631501C2 (en)
WO (1) WO1998005951A1 (en)

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Also Published As

Publication number Publication date
WO1998005951A1 (en) 1998-02-12
DE19631501A1 (en) 1998-02-05
DE19631501C2 (en) 1998-09-10
KR19990063936A (en) 1999-07-26
US6018982A (en) 2000-02-01
KR100514422B1 (en) 2005-11-21
JPH11514092A (en) 1999-11-30

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