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WO2017102279A1 - Capteur destiné à être utilisé dans une ligne d'échappement - Google Patents

Capteur destiné à être utilisé dans une ligne d'échappement Download PDF

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Publication number
WO2017102279A1
WO2017102279A1 PCT/EP2016/078728 EP2016078728W WO2017102279A1 WO 2017102279 A1 WO2017102279 A1 WO 2017102279A1 EP 2016078728 W EP2016078728 W EP 2016078728W WO 2017102279 A1 WO2017102279 A1 WO 2017102279A1
Authority
WO
WIPO (PCT)
Prior art keywords
cone
insulating material
ceramic
electrically insulating
sensor
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/EP2016/078728
Other languages
German (de)
English (en)
Inventor
Christian Kiefl
Jörg Friedel
Hans Gschossmann
Kay Schwarzkopf
Gary Collier
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of WO2017102279A1 publication Critical patent/WO2017102279A1/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
    • G01N27/4078—Means for sealing the sensor element in a housing

Definitions

  • the invention relates to a sensor for use in an exhaust system of a motor vehicle, wherein the sensor has a sensor element which is connected to at least one electrical feedthrough, wherein the electrical feedthrough supplies the sensor element with electrical energy and / or the electrical Carrying the signal generated by the sensor element fürlei ⁇ tet to a subsequent electronics.
  • the measuring devices offer, in which the measuring elements, for example in the form Pla ⁇ tinsonde which changes its resistance as a function of the tempering temperature ⁇ be introduced into the exhaust line a.
  • Measuring probe itself is thermally highly loaded in the exhaust system, the signals of the probe must be performed in the thermally low ⁇ burdened environment of the exhaust system in order to evaluate them.
  • Soot sensors are used to measure the currently emitted soot in the exhaust system, so that the engine management in a power ⁇ vehicle in a current driving situation information to come to reduce the emission values with regulatory adjustments.
  • the engine management in a power ⁇ vehicle in a current driving situation information to come to reduce the emission values with regulatory adjustments.
  • Soot sensors an active exhaust gas purification are initiated by exhaust soot filter or an exhaust gas recirculation to the engine done.
  • soot filtering regenerable filters are used, which filter out a significant portion of the carbon black content from the exhaust gas.
  • Needed soot ⁇ sensors for the detection of carbon black to monitor the function of the soot filter or to control their regeneration cycles.
  • the soot sensors also operate at high temperatures in the exhaust system and transmit the determined data to control devices which are arranged outside the exhaust gas line.
  • solder gaps are formed according to the prior art as ra ⁇ dial circumferential, axially parallel and coaxially formed Spal ⁇ te, the circumferential solder gap may have a tolerance of 30 to 100 ym to ensure good filling with the brazing without it An undesirable overfilling of the solder gap with brazing material occurs.
  • the object is achieved by sensors with features according to the independent claims.
  • the electrical feedthrough in the region in which it penetrates the ceramic, electrically insulating material is formed cone-shaped and the ceramic, electrically insulating material in the region in which it is penetrated by the electrical feedthrough is also ko ⁇ nusförmig formed, wherein the first cone has the same conicity as the second cone and the first cone is arranged to the second cone such that a gap of defined width between the first cone and the second cone is formed and this gap with the high-temperature hartlot is filled, both the ceramic, elec ⁇ trically insulating material and electrical feedthrough can be produced without complicated post-processing steps.
  • the ceramic, electrically insulating material can be used directly after firing so "as fired” and does not need to be ground or polished consuming.Even the electrical feedthrough can be easily made without having to spend elaborate turning and grinding experienced the manufacture of the sensor according to the invention is considerably simplified and the costs for producing the sensor according to the invention considerably lower than in the case of the production of a conventional sensor By the use of a first and a second cone with the same taper, a simple axial displacement of the construction can be achieved. Parts to each other, the gap width is sufficiently accurate ⁇ be adjusted, so that the high-temperature solder can fully fill the gap ⁇ constantly and creates a gas-tight connection between the ceramic, electrically insulating material and the electrical feedthrough.
  • FIG. 1 shows an elongated high-temperature sensor
  • FIG. 2 shows a soot sensor
  • FIG. 3 shows a schematically illustrated oxygen sensor
  • FIG. 4 shows a sensor according to the prior art
  • FIG. 5 shows a sensor according to the invention
  • FIG. 6 shows a further sensor according to the invention
  • Figure 7 shows a motor vehicle with an exhaust system.
  • 1 shows an elongated high-temperature sensor 6.
  • the high temperature sensor 6 is suitable for use in an exhaust system of a motor vehicle.
  • the Hochtemperatursen ⁇ sor 6 consists of a protective tube 9, which is closed on one side with the protective tube cap 2.
  • the temperature sensor element 7 can be seen.
  • This Tempe ⁇ ratursensorelement 7 is typically a resistive sensor element, its resistance value is either increased or decreased with increasing temperature.
  • These sensor elements are known, for example, under the name NTC or PTC.
  • the space between the sensor element 7 and the protective tube cap 2 is filled with a material 8 which conducts heat well. This can be, for example, a fine silicon powder.
  • the electrical lines 1 can be seen, which produce an electrical connection between the sensor element 7 and a subsequent evaluation electronics, not shown here.
  • the electrical lines 1 forms a passage through a mounting base 4.
  • the mounting base 4 may consist of a ceramic, electrically insulating material.
  • the electrical lines 1 are mounted in a line carrier 3, which usually produces the electrical insulation between the electrical lines and the metallic protective tube 9.
  • the protective tube 9 is firmly connected to a part of the stiffening tube 5.
  • the stiffening tube 5 may be formed as a rotationally symmetrical, metallic sheath.
  • the mounting base 4 for the high-temperature sensor 12 can be detected. With the mounting base 4, the high temperature sensor 6 can be mounted in the exhaust system.
  • FIG. 2 shows a soot sensor 11.
  • the soot sensor 11 is suitable for use in an exhaust gas system of a motor vehicle.
  • the soot sensor 11 consists of a measuring electrode 12, which is arranged in the interior of an outer electrode 13.
  • the outer ⁇ electrode 13 may be formed as a rotationally symmetrical, metallic sheath.
  • Between the measuring electrode 12, which forms a sensor element, and the outer electrode is the exhaust gas of the internal combustion engine, in which soot particles 14 are contained.
  • the concentration of the soot particles 14 in the exhaust gas is to be measured by the soot sensor 11.
  • a measuring voltage is applied by the voltage supply 16 between the measuring electrode 12 and the outer electrode 13.
  • the measuring electrode 12 is electrically insulated from the outer electrode 13 by means of the insulating body 15.
  • the Isolationskör ⁇ per 15 can be constructed as a disc of a ceramic, electrically insulating material. Furthermore, it can be seen in FIG. 1 that an ohmic resistor 17 is connected between the voltage supply 16 and the outer electrode 13 and has an ohmic resistance in order to be able to measure the relatively small currents that form due to the soot particles 14 between the measuring electrode 12 and the outer electrode 13. The measurement of these currents is carried out by the current measuring element 18, which is connected to a Auswer ⁇ teelektronik 19. Such soot sensors are used for on-board diagnostics in motor vehicles with diesel engines.
  • the oxygen sensor 28 shown schematically in Figure 3 has a sensor element 22, which on the front end of a rod-shaped support member 25 is arranged. This may be, for example, an interdigital electrode.
  • the electrical conductors 21 of the sensor element 22 extend in FIG. 3 to the right into a contact region of the oxygen sensor connector 29.
  • a sensor housing 23 forms a holder for the sensor element 22 and has evaluation electronics, not shown here, for the sensor element 22.
  • the sensor housing 23 may be formed as a rotationally symmetrical, metal ⁇ metallic shell.
  • the sensor element 22 may be surrounded by a metal cap 26, which may be formed as a protective tube.
  • the sensor element 22 extends coaxially with the metal cap 26, which is provided with a plurality of openings 27, so that the sensor element 22 can come into contact with the exhaust-air mixture 30 whose oxygen content is to be measured.
  • the plate-shaped member 24 is provided, which is designed as a gas-tight closure of the oxygen sensor 28.
  • the plate-shaped component 24 can be constructed as a ceramic, electrically insulating material.
  • the electrical conductors 21 of the sensor element 22 form a passage 25 through the plate-shaped ceramic component 24. All of the sensors presented in FIGS. 1 to 3 are for
  • All of the sensors presented in FIGS. 1 to 3 have electrical feedthroughs which have to be permanently gas-tight, with the feedthroughs having to retain their electrically insulating properties unchanged during operation of the sensors.
  • the sensors shown in Figures 1 to 3 show rotationally symmetrical, metallic shells, which are connected to the ceramic, electrically insulating material. In this case, a gap having a defined width between the rota tion ⁇ symmetrical metallic shell and the ceramic, electrically insulating material is formed and this gap is filled with the high temperature braze.
  • FIG. 4 shows a sensor 31 according to the prior art.
  • the sensor 31 has a sensor element 32, which is connected to an elec ⁇ cal implementation 33.
  • Carrying out 33 penetrates a ceramic, electrically iso- lierendes material 35.
  • the area of penetration is 33 to a Hochtemperaturhartlot he know ⁇ between the ceramic electrically insulating material 35 and the conducting 36th
  • the gap 39 between the ceramic, electrically insulating material 35 and the electrical feedthrough 33 is subject to extremely tight tolerances.
  • the gap 39 must be carried out very smoothly, and he may have Zwi ⁇ rule generally 30 and 100 ym Clear width. These small To ⁇ tolerances are necessary so that on the one hand enough to penetrate into the gap high tempera ⁇ turhartlot and can be evenly distributed, but can not flow into undesirable locations.
  • the electrical feedthrough 33 is electrically connected to a subsequent electronics 34 after being penetrated by the ceramic, electrically insulating material 35.
  • the signals generated by the sensor element 32 can be sent to the subsequent electronics 34 for further processing.
  • a rotationssymmet--driven, metallic shell 40 can be seen, also gas-tight manner by means of a high temperature brazing alloy 36 to the Kerami ⁇ rule, electrically insulating material 35 is.
  • a gap 39 must be made, which corresponds to the high quality requirements in order to produce a gas-tight connection by the high-temperature braze 36.
  • FIG. 5 shows a sensor 31 according to the invention for use in an exhaust gas system of a motor vehicle. It may be a known from Figures 1 to 3 or any other suitable for use in the exhaust system of a motor vehicle sensor.
  • the sensor 31 shows a sensor element 32, which is connected to at least one electrical feedthrough 33, wherein the electrical feedthrough 33 supplies the sensor element 32 with electrical energy and / or the electrical feedthrough passes on the signals generated by the sensor element 32 to a subsequent electronic unit 34 ,
  • the electrical duct 33 leads through a ceramic, electrically insulating material 35.
  • the ceramic, electrically insulating material 35 is gas-tightly connected to the electrical bushing 33, by switching between the electrical feed-through 33 and the ceramic, electrically insulating material 35, a Hochtemperaturhartlot 36 are ⁇ is orders.
  • the electrical feedthrough is formed conically in the region in which it penetrates the ceramic electrically insulating material 35 33, and the ceramic, electrically insulating material 35 is Be ⁇ rich in the one in which it from the electrical feedthrough 33 is penetrated, also cone-shaped.
  • the first cone 37 has the same conicity as the second cone 38. Conicity is the change in the diameter of a cone along its axial extension.
  • the first cone 37 and the second cone 38 are arranged such that a gap with a defined Prei ⁇ te between the first cone 37 and the second cone 38 is formed.
  • the width of this gap is, for example, 30 ym to 100 ym.
  • the thus formed gap 39 is filled with the high temperature solder 36, whereby a gas-tight connection between the electrical feedthrough 33 and the ceramic, electrically insulating material 35 is made.
  • the sensor for use in an exhaust gas system of a motor vehicle may optionally have at least one rotationally symmetrical metallic shell.
  • the rotationally symmetrical, metallic shell 40 the ceramic, electrically insulating material 35 is arranged. Also, the rotationally symmetrical metallic shell 40 is gas-tightly connected to the ceramic, electrically insulating material 35 by means of a high-temperature brazing filler metal 36 by the
  • High-temperature brazing material 36 is introduced into the gap 39 between the rotati ⁇ onssymmetrischen, metallic shell and the ceramic, electrically insulating material 35.
  • the ro ⁇ tationssymmetrische, metallic shell 40 is formed in the area in which the ceramic, electrically insulating material 35 is arranged conically.
  • the ceramic j ⁇ specific, electrically insulating material 35 is in the region where it is surrounded by a rotationally symmetrical metallic shell 40 is formed conically.
  • the third cone 41 has the same conicity as the fourth cone 42.
  • the fourth cone 42 is arranged in such a way to the third cone 41, that a gap 39 with a defined width between the third cone 41 and the fourth cone 42 is formed.
  • This de ⁇ fined width of the gap 39 may be, for example, 30 ym to 100 ym.
  • the gap 39 is also filled with a high ⁇ temperaturhartlot 36, whereby a gastight Verbin ⁇ connection between the ceramic electrically insulating material 35 and the rotationally symmetrical metallic shell is formed 40th
  • the advantage of the conical design of the electrical feedthrough 33, of the ceramic, electrically insulating material. as 35 and the rotationally symmetrical, metallic shell 40 is the possibility to adjust by an axial displacement of the cone to each other, the width of the gap 39 can.
  • the quality of the surface quality of the electrical feedthrough 33, of the ceramic, electrically insulating material 35 and of the rotationally symmetrical metallic sheath 40 can be made significantly lower than in the case of sensors known from the prior art.
  • the adjustment of the gap 39 is therefore carried out by ei ⁇ ne slight displacement of the electrical feedthrough 33 relative to the ceramic, electrically insulating material 35 and the rotationally symmetrical metallic shell 40 to the ceramic, electrically insulating material 35.
  • ei ⁇ ne slight displacement of the electrical feedthrough 33 relative to the ceramic, electrically insulating material 35 and the rotationally symmetrical metallic shell 40 to the ceramic, electrically insulating material 35 can be a larger or smaller axial displacement of these components lead to the desired gap width.
  • FIG. 6 also shows a further sensor 31 according to the invention for use in an exhaust gas system of a motor vehicle.
  • a ceramic, electrically insulating material 35 can be seen, which is connected to a plurality of rotationally symmetrical, metallic sheaths 40.
  • the rotationally symmetrical metallic jackets 40 are formed partially cone-shaped, and also the ceramic electrically insulating material 35 is correspondingly conically out ⁇ forms. It can be seen that in each case a third cone 41 has the same conicity as a fourth cone 42.
  • FIG. 7 shows a motor vehicle 50 with an exhaust gas line 49.
  • the exhaust gas line carries the exhaust gases generated by the internal combustion engine 51.
  • at least one sensor 6, 11, 28, 31 is arranged for use in an exhaust line 49 of a motor vehicle 50. Since 49 Tempera ⁇ temperatures between -40 ° C during the cold start of the motor driving persuasion may prevail at a high load operation of the internal combustion ⁇ machine 51 in the exhaust line up to over 1000 ° C, are applied to the electrical feedthroughs 25, 33 of the sensor particularly high demands ge ⁇ represents, which has become fair with the sensor according to the invention.

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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)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

L'invention concerne un capteur destiné à être utilisé dans une ligne d'échappement d'un véhicule automobile, ledit capteur comprenant un élément sensible qui est relié à au moins une traversée électrique, ladite traversée électrique alimentant l'élément sensible en énergie électrique, et/ou transmettant des signaux générés par l'élément sensible à une électronique située en aval, ladite traversée électrique passant à travers un matériau céramique électriquement isolant, la traversée électrique étant reliée au matériau céramique électriquement isolant par une liaison étanche aux gaz, réalisée au moyen d'une brasure forte haute température disposée entre la traversée électrique et le matériau céramique électriquement isolant. Afin de permettre l'obtention d'un capteur présentant une étanchéité durable aux gaz, destiné à être utilisé dans une ligne d'échappement, et dont la fabrication est peu onéreuse, la traversée électrique présente, dans sa partie traversant le matériau céramique électriquement isolant, une forme de cône, et le matériau céramique électriquement isolant présente également une forme de cône dans la partie à travers laquelle passe la traversée électrique, le premier cône présentant la même conicité que le second cône, et le premier cône étant disposé de telle manière relativement au second cône qu'un espace présentant une largeur définie est formé entre le premier cône et le second cône, ledit espace étant rempli avec la brasure forte haute température.
PCT/EP2016/078728 2015-12-16 2016-11-24 Capteur destiné à être utilisé dans une ligne d'échappement Ceased WO2017102279A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015225434.8A DE102015225434B3 (de) 2015-12-16 2015-12-16 Sensor und dessen Herstellungsverfahren zur Anwendung in einem Abgasstrang
DE102015225434.8 2015-12-16

Publications (1)

Publication Number Publication Date
WO2017102279A1 true WO2017102279A1 (fr) 2017-06-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/078728 Ceased WO2017102279A1 (fr) 2015-12-16 2016-11-24 Capteur destiné à être utilisé dans une ligne d'échappement

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DE (1) DE102015225434B3 (fr)
WO (1) WO2017102279A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT523645B1 (de) * 2020-04-06 2021-10-15 Avl List Gmbh Adapteranordnung und Bauteilverbund

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2235105A1 (de) * 1972-07-18 1974-01-31 Bosch Gmbh Robert Elektrochemischer messfuehler fuer die bestimmung des sauerstoffgehaltes in abgasen, insbesondere in abgasen von verbrennungsmotoren
DE102004055889A1 (de) * 2003-11-21 2005-06-09 Linde Ag Verbindung und Verfahren zur Herstellung einer Verbindung zwischen einem zylindrischen, keramischen und einem metallischen Bauteil
DE102006016566A1 (de) * 2005-09-22 2007-03-29 Beru Ag Zusammengesetzter Leiter, insbesondere für Glühkerzen für Dieselmotoren
WO2008009533A2 (fr) * 2006-07-19 2008-01-24 Robert Bosch Gmbh Capteur de gaz
DE102008042991A1 (de) * 2008-10-21 2010-04-22 Robert Bosch Gmbh Einrichtung zum Abdichten eines Kabeldurchgangs

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19707458A1 (de) * 1997-02-25 1998-08-27 Bosch Gmbh Robert Meßfühler und Verfahren zu dessen Herstellung
JP5034394B2 (ja) * 2006-09-13 2012-09-26 株式会社デンソー 圧力センサ
JP5756415B2 (ja) * 2011-05-19 2015-07-29 日本特殊陶業株式会社 センサ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2235105A1 (de) * 1972-07-18 1974-01-31 Bosch Gmbh Robert Elektrochemischer messfuehler fuer die bestimmung des sauerstoffgehaltes in abgasen, insbesondere in abgasen von verbrennungsmotoren
DE102004055889A1 (de) * 2003-11-21 2005-06-09 Linde Ag Verbindung und Verfahren zur Herstellung einer Verbindung zwischen einem zylindrischen, keramischen und einem metallischen Bauteil
DE102006016566A1 (de) * 2005-09-22 2007-03-29 Beru Ag Zusammengesetzter Leiter, insbesondere für Glühkerzen für Dieselmotoren
WO2008009533A2 (fr) * 2006-07-19 2008-01-24 Robert Bosch Gmbh Capteur de gaz
DE102008042991A1 (de) * 2008-10-21 2010-04-22 Robert Bosch Gmbh Einrichtung zum Abdichten eines Kabeldurchgangs

Also Published As

Publication number Publication date
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