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WO2002040849A1 - Detecteur de gaz d'echappement - Google Patents

Detecteur de gaz d'echappement Download PDF

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Publication number
WO2002040849A1
WO2002040849A1 PCT/DE2001/004225 DE0104225W WO0240849A1 WO 2002040849 A1 WO2002040849 A1 WO 2002040849A1 DE 0104225 W DE0104225 W DE 0104225W WO 0240849 A1 WO0240849 A1 WO 0240849A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
gas sensor
carrier element
gas
sensor according
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.)
Ceased
Application number
PCT/DE2001/004225
Other languages
German (de)
English (en)
Inventor
Helmut Weyl
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
Priority claimed from DE10151291A external-priority patent/DE10151291B4/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to JP2002543143A priority Critical patent/JP2004514148A/ja
Priority to EP01996680A priority patent/EP1337749A1/fr
Publication of WO2002040849A1 publication Critical patent/WO2002040849A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • G01N27/4077—Means for protecting the electrolyte or the electrodes

Definitions

  • the invention is based on a gas sensor according to the preamble of the independent claims.
  • a gas sensor of the generic type has a sensor element which is arranged in a housing and has contact surfaces at its connection-side end. The contact surfaces are electrically connected to contact parts.
  • a connecting element is provided, on which a spring element engages, so that the connecting element presses the contact parts onto the contact surfaces and an electrical contact is thus produced.
  • the contact parts have crimp contacts which are each electrically connected to a connecting cable leading out of the housing. The connection cables are combined to form a connection line.
  • the sensor element arranged in the housing works with a reference gas which flows through an opening provided at the connection-side end of the sensor element and into the Sensor gas introduced into the reference gas channel can reach a reference gas space in the measuring range of the sensor element. From DE 196 11 572 AI it is known to lead the reference gas via the connecting line to the connection-side end of the sensor element. For this purpose, gas-permeable sections are provided in the connecting line.
  • the disadvantage here is that high demands are made on the cleanliness of the components during manufacture. Furthermore, the ability to breathe, ie the gas flow that can be achieved during operation between the gas atmosphere outside and inside the housing, is limited, which can lead to undesirable fluctuations in the concentration of a gas component in the reference gas space. As a result, the measurement result of the gas sensor can be falsified.
  • the gas sensor according to the invention with the characterizing features of the independent claims has the advantage over the prior art that the gas sensor is simple and efficient to manufacture and has a good gas flow of a reference gas to a connection-side end of the sensor element, so that the measurement result of the gas sensor is falsified by too low or too high a concentration of at least one gas component in the reference gas is avoided.
  • Carrier element provided.
  • a porous material is arranged between the carrier element and the housing.
  • a flow path is provided along the outer surface of the support member.
  • a reference gas located outside the gas sensor can enter the housing through at least one introduced opening, through the porous material and via the flow path along the outer surface of the carrier element to the connection-side end of the sensor element fixed in the gas sensor.
  • the porous material prevents impurities from entering the housing.
  • an opening is provided in the support element through which the reference gas can reach the connection-side end of the sensor element via a recess in the support element which receives an end region of a connection cable and a crimp connection of a contact part which is contacted with this connection cable.
  • the flow path along the outer surface of the support member is through a taper of the support member on its
  • the taper or extension must be designed in such a way that adequate access of the reference gas outside the gas sensor to an interior of the gas sensor is ensured, the connection-side end of the sensor element being provided in the interior.
  • the tapering or widening can be, for example, step-shaped or conical.
  • the tapering of the carrier element can run around the entire lateral surface. It is also conceivable that the taper is in the form of at least one channel-shaped recess in the lateral surface of the carrier element, which extends the area outside the gas sensor with an interior of the gas sensor connect. In a similar manner, a channel-shaped expansion of the elements surrounding the carrier element can be provided.
  • the porous material is a porous sleeve made of a high-temperature-resistant plastic, which has sufficient stability even at high temperatures and securely fixes the carrier element.
  • the porous material is a porous tube, for example made of PTFE, which is stretched over a metallic inner sleeve, so that the porous tube is arranged between the metallic inner sleeve and the housing.
  • the carrier element is securely fixed by the metallic inner sleeve.
  • at least one opening is likewise made in the metallic inner sleeve. In the area of tapering and / or widening, the carrier element is at a distance from
  • the taper of the carrier element and or the expansion of the metallic inner sleeve therefore extends from the area of the opening in the metallic inner sleeve in the direction of the sensor element.
  • At least one opening is made in the carrier element, which leads to a recess in the carrier element in which a crimp connection of the contact is arranged.
  • the reference gas can thus also reach the connection-side end of the sensor element through the opening of the carrier element and the recess in the carrier element.
  • at least two of the openings made in the housing, in the metallic inner sleeve and in the carrier element are arranged one above the other.
  • FIG. 1 shows a sectional view of a gas sensor according to the prior art
  • FIGS. 2, 3 and 4 show a partial area of a first, second and third embodiment of a first embodiment of the gas sensor according to the invention in a sectional view
  • FIG. 5 shows a second embodiment of the invention
  • FIG. 6 shows a cross section corresponding to the line VI - VI in FIG. 5 through the second embodiment.
  • FIG. 1 shows a gas sensor 10, for example a lambda probe or a broadband lambda probe, according to the prior art.
  • the gas sensor 10 has a measurement side
  • Section 15 and a connection-side section 16 and has a metallic housing 13, which is identified in the measurement-side section with the reference symbol 13a and in the connection-side section 16 with the reference symbol 13b.
  • a sensor element 14 is fixed in a gas-tight manner in the housing 13 by ceramic molded parts 25, 26 and by a sealing element 27.
  • the gas sensor 10 is connected in its connection-side section 16 to a cable sheath 12 in which connection cables 18 for the sensor element 14 are guided.
  • a protective tube 22 with gas inlet and gas outlet openings 23 is fastened to the measurement-side section 13a of the housing 13.
  • the protective tube 22 surrounds the measurement-side end 14a of the sensor element 14 protruding from the measurement-side section 13a of the housing 13.
  • a thread 24 is also attached to the measurement-side section 15, with which the gas sensor 10 can be fastened in an exhaust pipe, not shown.
  • connection-side section of the housing 13b is attached in a gas-tight manner to the measurement-side section of the housing 13a by means of a radially surrounding weld seam 31.
  • the connection-side section of the housing 13b surrounds the connection-side end 14b of the sensor element 14 and forms an interior 33 which contains a reference gas atmosphere, for example air, which can reach a reference gas channel (not shown) which is introduced into the sensor element 14.
  • the sensor element 14 has contact surfaces, not shown, which are contacted with contact parts 35.
  • the contact parts 35 are arranged in, for example, a two-part connecting element 40, the two parts of the connecting element 40 being held together by a spring element 41.
  • the contact parts 35 are pressed onto the contact surfaces of the sensor element 14.
  • the cable-side section of the contact parts 35 is designed with a crimp connection 43.
  • the contact parts 35 are electrically connected to the connecting cables 18 by means of the crimp connections 43.
  • the housing '13 is performed on the connection-side end 13b having a tapered cylindrical portion 45th
  • the cylindrical section 45 is provided with a cable bushing 50 locked.
  • the cable bushing 50 consists for example of PTFE and has 18 through holes 51 corresponding to the number of connecting cables to be fed through.
  • the through holes 51 are dimensioned so that a gap is formed between the connecting cable 18 and the through holes 51 through which the reference gas can reach the interior 33.
  • the cable sheath 12 is, for example, a PTFE hose which has pores and / or gas-permeable sections on its outer surface through which the reference air can penetrate into the interior of the hose.
  • FIG. 2 shows a connection-side section 116 of a first embodiment of a first exemplary embodiment of a gas sensor 110 according to the invention.
  • the connection-side section 113b of a metallic housing 113 is shown, in which a connection-side end 114b of a sensor element 114 with contact surfaces (not shown) is arranged.
  • the contact surfaces of the sensor element 114 are electrically connected to contact parts 135, which are pressed onto the contact surfaces of the sensor element by a spring element 141 engaging a connecting element 140.
  • the contact parts 135 have crimp connections 143 in a contacting area 160, which establish electrical contact between the contact parts 135 and connection cables 118 leading out of the housing 113.
  • the connecting cables 118 are sealed gas-tight by a cable bushing 150.
  • the cable bushing 150 can consist, for example, of a silicone rubber or of a temperature-resistant fluoroelastomer, for example Viton (FKM) from Dupont.
  • a carrier element 161 is provided in the contact area 160.
  • the carrier element 161 has cutouts 162 for receiving the connecting cables 118 and the crimp connections 143 of the contact parts 135.
  • the cutouts 162 narrow on the side facing the connecting cables 118, thereby preventing the connecting cables 118 from slipping out of the carrier element 161.
  • the contact parts 135 protrude from the end of the sensor element 114
  • the sensor element 114 has an opening (not shown) of a reference gas space arranged in the sensor element on the connection side 114b in the interior 133 of the connection-side section 113b of the housing 113.
  • a metallic inner sleeve 165 which surrounds the carrier element 161, is introduced into the housing 113.
  • a porous hose is provided in the contacting area 160 between the inner sleeve 165 and the housing 113.
  • the porous hose 166 is made of PTFE
  • the carrier element 161 is made of solid PTFE or a high-temperature-resistant plastic such as polyid, polyether ketone (PEK) or polyether ether ketone (PEEK).
  • Openings 171 are made in the housing 113 and openings 172 are made in the inner sleeve 165.
  • the openings 171, 172 of the housing 113 and the inner sleeve 165 lie one above the other.
  • the reference gas can thus reach the area of the carrier element 161 through the openings 171 in the housing 113, through the porous hose 166 and through the openings 172 in the inner sleeve 165.
  • the carrier element 161 has a taper 174 on its side facing the sensor element 114, which tap starts from the area of the openings 171, 172 of the housing
  • the carrier element 161 In the area of the taper 174, the carrier element 161 is arranged at a distance from the inner sleeve 165. Through the space between the support element 161 in the In the area of the taper 174 and the inner sleeve 165, the reference gas can reach the connection-side end 114b of the sensor element 114 and thus the reference gas space.
  • the taper extends on the side facing the sensor element 114 over the entire lateral surface of the carrier element 161.
  • the taper leads like a channel from the opening in the inner sleeve and / or in the housing to the interior.
  • several channel-like tapering can be provided. Outside the channel-like tapering, the carrier element lies directly on the inner sleeve, so that the carrier element is additionally fixed on its side facing the sensor element.
  • the openings of the housing and the inner sleeve are rotated relative to one another. In this case it must be ensured that a sufficient gas exchange is ensured between the opening of the housing and the opening of the inner sleeve through the porous hose arranged between the housing and the inner sleeve.
  • FIG. 3 shows a second embodiment of the first exemplary embodiment, which differs from the first embodiment shown in FIG. 2 in that between the housing 113 and the carrier element 161 instead of the inner sleeve 165 and the porous hose 166, a porous sleeve having a porous material 167 is provided.
  • the porous sleeve 167 is made of PTFE, for example.
  • the reference gas can be introduced via the opening 171 made in the housing 113, the porous sleeve 167 and via the space between the taper 174 of the carrier element 161 and the porous sleeve 167 into the interior 133 and thus to the reference gas space of the sensor element 114.
  • Figure 4 shows a third embodiment of the first embodiment, which differs from the first and second
  • Embodiment differs in that the carrier element 161 has at least one opening 173, which is provided in the region of the opening 172 of the inner sleeve 165 and leads to the recess 162 in the carrier element 161.
  • the reference gas can thus reach the interior 133 via the area of the taper 174 of the carrier element 161 as well as via the opening 173 and the recess 162 of the carrier element 161.
  • four openings 173 are provided in the carrier element 161. Accordingly, four openings 172 are also made in the inner sleeve 165.
  • FIG. 5 and FIG. 6 show a connection-side section 216 of a second exemplary embodiment of a gas sensor according to the invention. Shown is the connection-side section 213b of a metallic housing 213, in which a connection-side end 214b of a sensor element 214 with contact surfaces (not shown) is arranged.
  • the contact surfaces of the sensor element 214 are electrically connected to contact parts 235, which are pressed onto the contact surfaces of the sensor element 214 by a spring element 241 acting on a connecting element 240.
  • the contact parts 235 have crimp connections 243 in a contacting region 260, which produce electrical contact between the contact parts 235 and connection cables 218 leading out of the sensor element 214.
  • the connecting cables 218 are sealed gas-tight by a cable bushing 250.
  • the cable bushing 250 can be made, for example, of a silicone rubber or of a more temperature-resistant one Fluoroelastomer, for example Viton (FKM) from Dupont.
  • FKM Viton
  • a carrier element 261 is provided in the contacting region 260.
  • the carrier element 261 has cutouts 262 for receiving the connecting cables 218 and the crimp connections 243 of the contact parts 235.
  • the cutouts 262 narrow on the side facing the connecting cables 218, thereby preventing the connecting cables 218 from slipping out of the carrier element 261.
  • the contact parts 235 protrude from the end of the carrier element 261 facing the sensor element 214 into an interior 233 of the housing 213.
  • the carrier element 261 is surrounded by a metallic inner sleeve 265.
  • a porous material is provided in the contact area 260 between the inner sleeve 265 and the housing 213.
  • the porous material is, for example, a porous hose 266.
  • the porous hose 266 consists, for example, of PTFE, the carrier element 261, for example, also consists of solid PTFE or a high-temperature resistant plastic such as polyimide, polyether ketone (PEK) or polyether ether ketone (PEEK).
  • sensor element 214 On the connection side, sensor element 214 has an opening (not shown) to a reference gas space arranged in the sensor element.
  • the opening faces the interior 233 of the housing 213.
  • the housing 213 In order to enable the reference gas located outside the connection-side section 216 of the gas sensor to have access to the interior 233 and thus to the reference gas space, the housing 213
  • Openings 271, openings 272 are made in the inner sleeve 265 and openings 273 in the carrier element 261.
  • the openings 273 in the carrier element 261 lead to the cutouts 262.
  • the openings 271, 272, 273 are arranged one above the other in the housing 213b, the inner sleeve 265 and the carrier element 261.
  • the reference gas can thus pass through the openings 271 made in the housing 213b, the porous hose 266, the openings 272 made in the inner sleeve 165, the openings 273 made in the carrier element 261 and the cutouts 262 into the interior 233 and thus to the reference gas space of the sensor element 214 arrive.
  • a porous sleeve comprising a porous material is provided between the housing and the carrier element instead of the inner sleeve and the porous hose.
  • the porous sleeve is made of PTFE, for example.

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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

La présente invention concerne un détecteur de gaz d'échappement permettant notamment la détection d'au moins une composante gazeuse dans des gaz d'échappement dans lesquels est placé un élément de détection (114) disposé à l'intérieur d'un boîtier métallique (113). L'élément de détection (114) présente à une extrémité (113b) du boîtier (113), située côté raccordement, dans une zone de contact (160), un élément de support (161) dans lequel se trouve au moins une partie d'au moins un contact. Entre l'élément de support (161) et le boîtier (113) se trouve un matériau poreux (116, 167). Dans la zone de contact (160), au moins une ouverture (171) est pratiquée dans le boîtier (113). Le long d'une surface extérieure de l'élément de support (161) se trouve un circuit de flux de sorte que les gaz d'échappement se trouvant à l'extérieur du détecteur de gaz (110) peuvent passer à travers l'ouverture (171) du boîtier (113), traverser le matériau poreux (166, 167) et circuler dans le circuit de flux le long de la surface extérieure de l'élément de support (161) pour atteindre l'extrémité (114b) de l'élément de détection (114), située côté raccordement.
PCT/DE2001/004225 2000-11-14 2001-11-13 Detecteur de gaz d'echappement Ceased WO2002040849A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2002543143A JP2004514148A (ja) 2000-11-14 2001-11-13 ガスセンサ
EP01996680A EP1337749A1 (fr) 2000-11-14 2001-11-13 Detecteur de gaz d'echappement

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10156357.0 2000-11-14
DE10056357 2000-11-14
DE10151291.0 2001-10-22
DE10151291A DE10151291B4 (de) 2000-11-14 2001-10-22 Gassensor

Publications (1)

Publication Number Publication Date
WO2002040849A1 true WO2002040849A1 (fr) 2002-05-23

Family

ID=26007659

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/004225 Ceased WO2002040849A1 (fr) 2000-11-14 2001-11-13 Detecteur de gaz d'echappement

Country Status (3)

Country Link
EP (1) EP1337749A1 (fr)
JP (1) JP2004514148A (fr)
WO (1) WO2002040849A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4749847B2 (ja) * 2005-11-21 2011-08-17 日本特殊陶業株式会社 センサユニット及びその製造方法
JP6859217B2 (ja) * 2017-07-04 2021-04-14 日本特殊陶業株式会社 ガスセンサ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4786397A (en) * 1987-10-09 1988-11-22 Allied-Signal Inc. Seal for single wire O2 sensor
DE4439854A1 (de) * 1994-11-08 1996-05-09 Bosch Gmbh Robert Elektrochemischer Meßfühler
DE19541218A1 (de) * 1995-11-04 1997-05-07 Bosch Gmbh Robert Anschluß und/oder Kupplungselement eines Meßfühlers
DE19542650A1 (de) * 1995-11-15 1997-05-22 Bosch Gmbh Robert Temperaturfeste Kabeldurchführung und Verfahren zu deren Herstellung
DE19611572A1 (de) * 1996-03-23 1997-09-25 Bosch Gmbh Robert Anschlußleitung für einen Meßfühler
DE19835345A1 (de) * 1998-08-05 2000-02-10 Bosch Gmbh Robert Lambda-Sonde mit belüftetem Formschlauch
JP2000249678A (ja) * 1998-12-28 2000-09-14 Ngk Spark Plug Co Ltd ガスセンサ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4786397A (en) * 1987-10-09 1988-11-22 Allied-Signal Inc. Seal for single wire O2 sensor
DE4439854A1 (de) * 1994-11-08 1996-05-09 Bosch Gmbh Robert Elektrochemischer Meßfühler
DE19541218A1 (de) * 1995-11-04 1997-05-07 Bosch Gmbh Robert Anschluß und/oder Kupplungselement eines Meßfühlers
DE19542650A1 (de) * 1995-11-15 1997-05-22 Bosch Gmbh Robert Temperaturfeste Kabeldurchführung und Verfahren zu deren Herstellung
DE19611572A1 (de) * 1996-03-23 1997-09-25 Bosch Gmbh Robert Anschlußleitung für einen Meßfühler
DE19835345A1 (de) * 1998-08-05 2000-02-10 Bosch Gmbh Robert Lambda-Sonde mit belüftetem Formschlauch
JP2000249678A (ja) * 1998-12-28 2000-09-14 Ngk Spark Plug Co Ltd ガスセンサ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 12 3 January 2001 (2001-01-03) *

Also Published As

Publication number Publication date
JP2004514148A (ja) 2004-05-13
EP1337749A1 (fr) 2003-08-27

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