WO2008125404A1 - Capteur de gaz pour déterminer une propriété physique d'un gaz mesuré - Google Patents

Capteur de gaz pour déterminer une propriété physique d'un gaz mesuré Download PDF

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Publication number
WO2008125404A1
WO2008125404A1 PCT/EP2008/052907 EP2008052907W WO2008125404A1 WO 2008125404 A1 WO2008125404 A1 WO 2008125404A1 EP 2008052907 W EP2008052907 W EP 2008052907W WO 2008125404 A1 WO2008125404 A1 WO 2008125404A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
sensor
sensor housing
gas sensor
sensor element
Prior art date
Application number
PCT/EP2008/052907
Other languages
German (de)
English (en)
Inventor
Georg Rixecker
Andreas Opp
Benjamin Hagemann
Christoph Treutler
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 WO2008125404A1 publication Critical patent/WO2008125404A1/fr

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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

Definitions

  • the invention is based on a gas sensor for determining a physical property of a measurement gas, in particular the concentration of at least one gas component or the temperature in the measurement gas, according to the preamble of claim 1.
  • the housing consists of a hollow housing body with a mounting sleeve and a mounting thread and a welded on the side facing away from the mounting thread side of the mounting body protective sleeve, in the end a cable gland is pressed.
  • the sensor element is located with a center portion in the mounting body and projects in each case with a measuring gas side end portion and a connection-side end portion of the housing.
  • the middle section is fixed in a gas-tight manner in the housing body by ceramic molded parts as well as by a sealing element.
  • the measuring gas side end portion is enclosed by a protective tube attached to the housing body, while the connection-side end portion is surrounded by the protective sleeve.
  • connection-side end portion there are contact surfaces for contacting the sensor element, via which the sensor element is connected by means of a contacting device to a connection cable inserted into the protective sleeve through the cable bushing.
  • the contacting device has a plurality of contact lugs which respectively rest on one of the contact surfaces and are pressed onto the contact surfaces by two pressure bodies arranged on opposite sides of the end portion. The pressure bodies are compressed by a spring element, so that between the contact lugs and the contact surfaces a frictional connection is made.
  • the cable-side end portions of the contact lugs are connected within the cable bushing by means of a crimp connection, each with an electrical conductor of the connecting cable.
  • the gas sensor according to the invention with the features of claim 1 has the advantage that is protected by the inclusion of the contact area between the sensor element and connecting cable in a produced by melting or pouring, the snug against the inner wall of the sensor housing seal the contact area against any access of gas and any Meßgasaustritt is prevented via the sensor housing.
  • the sealing body takes over the task of holding and sealing the sensor element in the sensor housing and secures the contact point against destruction by acting on the connection cable tensile or bending forces.
  • the contact between the conductor and sensor element is cohesively and is preferably made by brazing, gap or resistance welding.
  • This Kunststoffmaschinesart results in conjunction with the easily assembled by a pre-assembly of sensor element and connecting cable, which can be easily installed in the sensor housing and cast or melted therein.
  • the total manufacturing costs for the gas sensor are lowered significantly.
  • the housing in addition to the sealing body enclosing the receiving portion nor an axially adjacent thereto support portion which encloses the connection cable on a defined length of cable. This ensures stabilization of the connection cable and fixation of the metal sheath line against axial displacement, which is reinforced by introduced into the support portion, point or circumferential welds or indentations.
  • the housing is a metal tube, preferably a stainless steel tube, and the mounting portion of the sensor housing is through
  • Crimping of the over the connecting cable extending pipe area made.
  • the by crimping preferably star-shaped axially extending lamellae, their number For example, is three or four, give a very good rigidity of the support portion of the housing and improved heat dissipation. Occasionally, the crimping to form only a single blade is sufficient. Basically, the number of slats is not crucial. Due to the crimping can be dispensed with an additional mechanical fixation of the metal sheathed cable.
  • At least the led out of the sensor housing end portion of the connecting cable is formed as known per se metal sheathed cable. Since metal sheathed cables are resistant to high temperatures with a temperature resistance> 800 ° C and sufficiently flexible to meet the demands made by the installation space of the gas sensor to the cable outlet, the use of metal sheathed cable production is considerably simplified manufacturing technology, since no additional temperature protection measures are taken for the connection cable have to.
  • an adapter made of elastic material is pushed onto the metal sheath line, on the one hand enclosing a line section of the metal sheath line and on the other hand supported on the sensor housing and the latter closes.
  • the adapter section encompassing the metal sheath line is designed significantly longer than the adapter section supporting the sensor housing.
  • FIG. 1 shows a perspective view of a gas sensor in the protective tube drawn off from the measuring gas side end section of the sensor element
  • FIG. 2 shows a longitudinal section of the gas sensor completed in FIG. 1 with a protective tube
  • Fig. 3 is a perspective view of a gas sensor without protective tube according to a second
  • Fig. 4 is a longitudinal section of the gas sensor in Fig. 3
  • Fig. 5 is a section along the line V - V in Fig. 4
  • Fig. 6 is a perspective view of a gas sensor without protective tube according to a third
  • FIG. 8 shows a perspective view of a gas sensor with an inner protective tube formed on the sensor housing according to a fourth exemplary embodiment
  • FIG. 9 shows a longitudinal section of the gas sensor in FIG. 8, FIG.
  • FIG. 10 is a side view of a gas sensor according to a fifth embodiment, partially in section,
  • FIG. 11 is an enlarged side view of an adapter in the gas sensor in FIG. 10
  • FIG. 12 is a perspective view of the adapter in FIG. 11
  • FIG. 13 is a perspective view of an adapter according to another embodiment
  • FIG. 14 is a longitudinal section of the adapter in FIG 13.
  • the gas sensor shown in perspective in FIG. 1 and in section in FIG. 2 for determining a physical property of a measurement gas, in particular the concentration of at least one gas component or the temperature in the measurement gas is for example a lambda probe for measuring the oxygen concentration in the exhaust gas of an internal combustion engine.
  • the gas sensor may also be designed for measuring the concentration of nitrogen oxides in the exhaust gas or for measuring the temperature in the exhaust gas.
  • the gas sensor has a sensor housing 11, a sensor element 12 and a connecting cable with a plurality of insulated electrical conductors 14, which is shown with a sensor-side end section.
  • the sensor element 12 projecting from the sensor housing 11 with a measuring gas side end section 121 carries contact surfaces on its connection side end section 122 facing away from it, to which the electrical conductors 14 are contacted.
  • the sensor element 12 is connected to a control device, not shown here.
  • gas passage holes 16 are present, so that the protective tube 15 flowing around measuring gas can reach the measuring gas side end portion 121 of the sensor element 12.
  • the sensor housing 11 has a hollow cylindrical receiving portion 111 for the sensor element 12 and a hollow support portion 112 for the sensor-side end portion of the connecting cable, which on the turned away from the protective tube 15 end of the Aufhahmeabterrorisms 111 from the Aufhahmeabêt 111 integrally axially continues and tapers conically towards its free end and cylindrically expires.
  • connection cable leading out of the sensor housing 11 or leading into the sensor housing 11, which is shown exclusively in FIG. 2 and can be seen in section in section, is designed as a so-called metal sheath line 17.
  • metal sheath line 17 which is known per se in terms of its structure, the wire-shaped conductors 14 are surrounded on all sides by good insulating mineral powder 18 and pressed into a tubular metal sheath 19 of oxidation- and corrosion-resistant material (FIG. 2).
  • the connection cable is in the course behind the metal sheath line 17 designed as a conventional motor vehicle wiring harness.
  • Metal sheathed cable 17 to the motor vehicle wiring harness by means of a plug or other, conventional, electrical connection technology.
  • the control unit is connected to the motor vehicle wiring harness.
  • one of the electrical conductors 14 is in each case contacted with a contact surface on the connection-side end section 122 of the sensor element 12.
  • the contacting takes place by a cohesive connection, which is produced by brazing or resistance welding.
  • the connection between the metal sheath line 17 and the sensor element 12 is gas-tight and mechanically resistant to tension.
  • the contact area between the contact surfaces on the sensor element 12 and the electrical conductors 14 and the end portions of sensor element 12 and metal sheath line 17 facing each other at the contact area are melted or cast into a high-temperature-resistant sealing body 20 which fills the entire receiving section 111 of the sensor housing 11.
  • the sealing body 20 As a material for the sealing body 20, a glass or a glass ceramic is used, wherein the glass ceramic has the advantage of a relation to the melting temperature increased, maximum operating temperature. Alternatively, a hydraulically setting potting compound can be used.
  • the metal sheath line 17 can still be fixed by a circumferential weld or multiple punctiform welds, which are introduced into the support portion 112 of the sensor housing 11.
  • indentations can also be made in the holding section 112, which press into the metal casing 19 of the metal sheath line 17 in a form-fitting manner.
  • the sensor housing 11 is designed as a metal turned part, in which the hollow Aufhahmeabêt 111 and the hollow support portion 112 are rotated with respect to the Aufhahmeabrough 111 reduced inner diameter.
  • the holding portion 112 is turned off to a reduced outer diameter with respect to the outer diameter of the receiving portion 111, wherein an elongated, conical transition is provided.
  • a mounting flange 113 with a conical seal seat 113a is turned on the sensor housing 11.
  • the protective tube 15 is pushed with the projecting beyond the end of the inner protective tube 151 end of the outer protective tube 152 and welded thereto.
  • the assembly of the gas sensor is carried out in such a way that the conductors 14 are contacted on the contact surfaces of the sensor element 12 and the metal sheath line 17 is retracted with sensor element 12 from the open end of the receiving portion 111 until the end position to be seen in Fig. 2 is reached.
  • a glass or a glass ceramic is introduced as a powder or as Pressimg. By heating the assembly in a furnace process, the glass or glass ceramic is melted.
  • the seal body 20 formed by the melt completely encloses the end portion 171 of the metal sheath line 17, the contact portion between the conductor 14 and the sensor element 12 and the entire sensor element 12 including the measuring-gas-side end portion 121 protruding from the sensor housing 11 within the accommodating portion 111 of the sensor housing 11.
  • the double protection tube 15 composed of the protective tubes 151, 152 is pushed onto the free end of the sensor housing 11 in the manner shown in FIG. 2 and welded onto the end section of the sensor housing 11.
  • the embodiment of the gas sensor shown in perspective in FIG. 3 and in longitudinal section in FIG. 4 differs from the previously described gas sensor in that the sensor housing 11 is not a rotary part but a metal tube, preferably a stainless steel tube, and the holder section 112 of the sensor housing 11 thereby that is made over the
  • Metal sheath line 17 extending portion of the metal tube is formed behind the seal body 20 by star-shaped crimping this pipe portion.
  • the stainless steel tube has, for example, an outer diameter of about 8 to 12 mm and a wall thickness of 0.3 to 0.7 mm and is a commercially available semi-finished product. As mentioned above, the connected assembly of sensor element 12 and metal sheath line 17 is inserted into the metal tube here as well. Then that will be
  • Metal tube crimped in his the metal sheath line 17 covering area To define the onset of crimping, an auxiliary tool can be inserted from the front of the metal tube Form of an additional tube in the non-deforming, the receiving portion 111 of the sensor housing 11 forming part of the metal tube are introduced, which is then removed again. After crimping the tube end, the glass or the glass ceramic is filled in the front region of the metal tube (eg as powder).
  • a Glaspulver- or Glaslotpresslings either as a part with a recess for the
  • a circumferential bead 21 is embossed, which is a stop for a disc 22 of metal (Fig. 7) forms, at which the
  • This disc 22 is an assembly aid and serves on the one hand as a rear conclusion for the Glaseinschmelzung and on the other hand for positioning the metal sheath line 17 during the furnace process and as a definition aid in the production of the crimping on the metal tube.
  • the metal disc 22 is placed and fixed in the pre-assembly on the metal sheath line 17, and the assembly of sensor element 12 and metal sheath line 17 is in the
  • the sensor housing 11 is a deep-drawn part, on which the inner protective tube 151 of the protective tube 15 is already formed with an outer diameter reduced with respect to the outer diameter of the receiving section 111.
  • the present in the transition from receiving portion 111 to the inner protective tube 151 oblique shoulder 23 forms a stop for a cover plate 24 made of ceramic, which surrounds the sensor element 12 and can be pre-assembled on this already.
  • the assembly of sensor element 12 and with these connected metal sheath line 17 is inserted from the remote from the inner protective tube 151, the open end of the deep-drawn part until the cover 24 abuts the transition shoulder 23.
  • FIG. 10 an embodiment of a gas sensor is shown in side view and partially in section, in which the contacting of the electrical conductors 14 on the contact surfaces on the connection-side end portion 122 of the sensor element 12 is made in a conventional manner non-positively.
  • the known contacting device 25 used here has two ceramic pressing bodies 26, 27 located on opposite sides of the end section 122, which press the conductors 14 onto the contact surfaces on the sensor element 12.
  • the pressure bodies 26, 27 are compressed by a spring element 28, so that between the conductors 14 and the contact surfaces a frictional connection is made.
  • the contacting device 25, together with the connection-side end section 122 of the sensor element 12, is surrounded by a metallic protective sleeve 29, which is welded onto the sensor housing 11.
  • the mounting flange 113 and beyond a mounting thread 114 is provided for installation of the gas sensor, and the sensor housing 11 Meßgashow turn the double protection tube 15 with inner and outer protective tube 151, 152 and gas passage holes 16 is placed.
  • the adapter 30 is on the one hand gas-tight connected to the metal jacket 19 of the metal sheath line 17 and on the other hand tensile strength fixed to the sensor housing 11.
  • the adapter 30 is shown in a longitudinal section in FIG. 10, in a side view in FIG. 11 and in a perspective view in FIG. 12. It has a base body 301 and two facing away from each other end faces of the base body 301 from the base body 301, axial hollow nozzle 302, 303, which are integral with the base body 301.
  • the outer diameter of the base body 301 is adapted to the inner diameter of the reduced diameter end portion 291 of the protective sleeve 29.
  • Each hollow pipe 302, 303 tapers conically, starting from the outer shell of the base body 301, and merges into a thin-walled hollow cylinder section 302a or 303a.
  • the metal sheath line 17 cross-section of the adapter 30 is thus significantly longer than the section formed by the base body 301 of the adapter 30, which is supported on the protective sleeve 29.
  • the adapter section engaging over the metal sheath line 17 is approximately 3.5 times the adapter section supporting the protective sleeve 29.
  • the hollow nozzle 302 facing the sensor element 12 is connected in a gas-tight manner to the metal jacket 19 of the metal sheathed cable 17 by means of a circumferential weld seam 31.
  • the weld seam 31 prevents slippage of the adapter 30 on the metal sheath line 17.
  • the hollow stub 303 facing away from the sensor element 12 unfolds due to the elasticity of the sheath
  • Adapter material has a damping effect, which relieves the metal sheath line 17.
  • the adapter 30 is fixed with its base body 301 to the protective sleeve 29 by a circumferential weld 32.
  • an adapter 33 instead of the adapter 30 shown in FIGS. 10, 11 and 12, it is also possible to use an adapter 33, as shown in FIG. 13 in perspective and in FIG. 14 in longitudinal section.
  • the also consisting of elastic material adapter 33 is deep-drawn and has a hollow cylindrical central portion 331 for sliding onto the metal sheath line 17 and an integral with this flange 332 with an arcuate radial portion 332a and a parallel to the central portion 331 extending cylinder portion 332b.
  • the middle part 331 is by means of a circumferential
  • this adapter 33 is capable of elastically absorbing and damping mechanical loads.
  • the metal jacket 19 of the metal sheath line 17 is not damaged, since during brazing only a local alloy, which is located in a near-surface region, does not penetrate deeply into the metal structure.
  • the metal sheath line 17 immediately encompassing, formed by the central portion 331 adapter section is significantly longer than the sleeve 29 on the protective support, formed by the flange 33 adapter portion.
  • the aspect ratio is about 3: 1.

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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)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

L'invention concerne un capteur de gaz servant à déterminer une propriété physique d'un gaz mesuré, en particulier la concentration d'au moins un composant ou la température du gaz mesuré, ce capteur présentant un élément sensible (12), un boîtier (11) dans lequel l'élément sensible (12) est logé au moins partiellement et un câble de raccordement qui sort axialement du boîtier (11) et qui comprend au moins un conducteur électrique (14) mis en contact sur l'élément sensible (12). Selon l'invention, pour que la connexion entre l'élément sensible (12) et le câble de raccordement soit simple et économique en termes de fabrication et de montage, la zone de contact entre l'élément sensible (12) et le ou les conducteurs électriques (14) ainsi que les sections d'extrémité de l'élément sensible (12) et du câble de raccordement situées près de cette zone de contact sont enveloppées hermétiquement dans un corps d'étanchéité (20) en verre ou en vitrocéramique s'adaptant à la paroi intérieure du boîtier (11) du capteur.
PCT/EP2008/052907 2007-04-17 2008-03-12 Capteur de gaz pour déterminer une propriété physique d'un gaz mesuré WO2008125404A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007017999.7 2007-04-17
DE200710017999 DE102007017999A1 (de) 2007-04-17 2007-04-17 Gassensor zur Bestimmung einer physikalischen Eigenschaft eines Messgases

Publications (1)

Publication Number Publication Date
WO2008125404A1 true WO2008125404A1 (fr) 2008-10-23

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ID=39433775

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Application Number Title Priority Date Filing Date
PCT/EP2008/052907 WO2008125404A1 (fr) 2007-04-17 2008-03-12 Capteur de gaz pour déterminer une propriété physique d'un gaz mesuré

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DE (1) DE102007017999A1 (fr)
WO (1) WO2008125404A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012207762A1 (de) 2012-05-09 2013-11-14 Robert Bosch Gmbh Abgassensor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61201152A (ja) * 1985-03-04 1986-09-05 Hitachi Ltd 酸素濃度検出器
US5329806A (en) * 1993-05-11 1994-07-19 General Motors Corporation Exhaust sensor with tubular shell
DE10234266A1 (de) * 2002-07-27 2004-02-26 Robert Bosch Gmbh Gasmessfühler
WO2004086023A1 (fr) * 2003-03-27 2004-10-07 Robert Bosch Gmbh Capteur

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19833863A1 (de) 1998-07-28 2000-02-03 Bosch Gmbh Robert Kabelanschluß für Meßfühler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61201152A (ja) * 1985-03-04 1986-09-05 Hitachi Ltd 酸素濃度検出器
US5329806A (en) * 1993-05-11 1994-07-19 General Motors Corporation Exhaust sensor with tubular shell
DE10234266A1 (de) * 2002-07-27 2004-02-26 Robert Bosch Gmbh Gasmessfühler
WO2004086023A1 (fr) * 2003-03-27 2004-10-07 Robert Bosch Gmbh Capteur

Also Published As

Publication number Publication date
DE102007017999A1 (de) 2008-10-23

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