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WO2018121905A1 - Élément capteur pour la détection de particules d'un gaz de mesure dans un espace de gaz de mesure - Google Patents

Élément capteur pour la détection de particules d'un gaz de mesure dans un espace de gaz de mesure Download PDF

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Publication number
WO2018121905A1
WO2018121905A1 PCT/EP2017/078027 EP2017078027W WO2018121905A1 WO 2018121905 A1 WO2018121905 A1 WO 2018121905A1 EP 2017078027 W EP2017078027 W EP 2017078027W WO 2018121905 A1 WO2018121905 A1 WO 2018121905A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
sensor element
measuring gas
electrode material
weight
Prior art date
Application number
PCT/EP2017/078027
Other languages
German (de)
English (en)
Inventor
Benedikt REINSCH
Sabine Roesch
Jens Schneider
Stefan Rodewald
Corinna Vonau
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201780081458.6A priority Critical patent/CN110121642A/zh
Priority to KR1020197018620A priority patent/KR102438819B1/ko
Publication of WO2018121905A1 publication Critical patent/WO2018121905A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/05—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a particulate sensor

Definitions

  • the measuring gas may be an exhaust gas of an internal combustion engine.
  • the particles may be soot or dust particles.
  • the invention will be described below without limitation
  • Two or more metallic electrodes may be mounted on an electrically insulating support.
  • the particle sensors evaluate the changed due to the particle accumulation electrical properties of an electrode structure. For example, a decreasing resistance or current at constant applied voltage can be measured.
  • Embodiments such as from DE 103 19 664 AI, DE10 2004 0468 82A1, DE 10 2006 042 362 AI, DE 103 53 860 AI, DE 101 49 333 A1 and WO
  • the metallic surfaces of the electrodes of the sensor elements are functionally exposed directly and unprotected the exhaust gas of the internal combustion engine at high operating temperatures. To ensure the highest possible quality of
  • the longevity of the electrode and in particular their erosion resistance under oxidizing and reducing conditions at high temperatures are essential prerequisites.
  • a rapid burnup of the outer electrode, in particular in the collecting phase or the regenerating phase is particularly critical. Due to the fine structure of the interdigital electrodes designed as a comb-like interdigital electrodes and a production-related limitation of the aspect ratio of height to width of the electrode fingers even small losses can lead to a removal of the surface of the electrodes, causing a malfunction or even a
  • electrochemical gas sensors comprising a metallic and a ceramic portion, wherein the metallic portion comprises a metal alloy.
  • the metallic portion can be formed by platinum or a platinum alloy. It is particularly advantageous if the platinum alloy contains rhodium and / or palladium with a total weight fraction of the platinum alloy of 5 to 10 wt .-% or iridium, ruthenium and / or cobalt with a
  • a sensor element is understood to be any device which is suitable for qualitatively and / or quantitatively detecting the particles and which, for example, can generate an electrical measurement signal corresponding to the detected particles, such as a voltage or a current.
  • the sensor element can be set up in particular for use in a motor vehicle.
  • the measuring gas may be an exhaust gas of the motor vehicle.
  • the measurement gas space can be any, open or closed space in which the measurement gas is received and / or which is flowed through by the measurement gas.
  • the measuring gas space may be an exhaust gas tract of an internal combustion engine, for example an internal combustion engine.
  • the sensor element comprises at least one carrier, wherein on the carrier at least a first electrode means and at least one second
  • Electrode device are applied.
  • the first electrode device and the second electrode device each have at least one electrode finger.
  • a carrier is used in the context of the present invention
  • electrode devices are understood to mean electrical conductors which are suitable for current measurement and / or a current measurement
  • Voltage measurement are suitable and / or which at least one with the Electrode devices in contact element with a voltage and / or current can act. Under the term
  • electrode fingers are basically understood to be any shape of the electrode device whose dimension in one dimension clearly exceeds the dimension in at least one other dimension, for example at least a factor of 2, preferably at least a factor of 3, particularly preferably at least one factor 5.
  • the carrier may comprise at least one electrically insulating material, in particular at least one ceramic material.
  • the carrier has at least one carrier surface.
  • a carrier surface is basically understood to mean any layer which delimits the carrier from its surroundings, and to which the first and the second electrode device of the sensor element are applied.
  • the first electrode device and the second electrode device may each have at least two electrode fingers.
  • the at least two electrode fingers of the first electrode device and the at least two electrode fingers of the second electrode device can engage in one another.
  • the electrode fingers of the first electrode device and the electrode fingers of the second electrode device can mesh in a comb-like manner. Furthermore, the first electrode device with the second
  • Electrode device have a structure selected from the group consisting of a herringbone structure, a zigzag structure and a
  • Winding structure Winding structure.
  • a cross-sectional profile of the electrode finger may be rectangular or trapezoidal.
  • a cross-sectional profile of the electrode finger is understood to mean an outline of the electrode finger which can be perpendicular to a main extension direction of the electrode finger.
  • the cross-sectional profile may be a profile in a sectional plane, which may be arranged perpendicular to the direction of extension of the electrode finger and perpendicular to the surface of the carrier. It is proposed that at least one surface of the electrode fingers set up for application by the measurement gas has an electrode material, in particular in the form of an alloy, which contains at least 50% by weight, preferably at least 55% by weight, more preferably at least 60% by weight. more preferably at least 65% by weight, more preferably at least 70
  • % By weight, more preferably at least 75% by weight, and preferably at most 95% by weight, more preferably at most 90% by weight, further preferably at most 85% by weight, more preferably at most 80% by weight
  • Base metal includes.
  • the at least one electrode finger can thus have a volume which consists entirely of the described electrode material.
  • Electrode finger has the electrode material described. Further embodiments are possible, in particular to the effect that those electrode fingers on the sensor element which, due to their spatial arrangement on the carrier, are first charged with the measurement gas have a volume which is completely described in the description
  • Electrode material exists while those electrode fingers on the
  • Sensor element which are applied to the last due to their spatial arrangement on the carrier with the sample gas, only in their surface having the described electrode material, while the remaining volume of the latter electrode fingers may have a differently composed, metallically conductive material.
  • the term "base metal” basically denotes any metallic constituent of an alloy which comprises at least 50% by weight of the alloy, ie the base metal is present in the alloy in a proportion which corresponds to a sum of the proportions of the other constituents of the alloy or the sum exceeds the proportions of the remaining constituents of the alloy.
  • alloy in this context refers to a material which has at least two different chemical elements with a metallic character, wherein the at least two different chemical elements are present in the alloy such that the alloy also has a metallic character.
  • metallic character refers basically to metallic properties of the material, which manifest themselves in particular in the simultaneous presence of a high electrical conductivity, a high thermal conductivity, a good ductility and a high thermal resistance of the material.
  • the base metal is selected from the group consisting of palladium (Pd), iridium (Ir), ruthenium (Ru) and rhodium (Rh).
  • the base metal does not comprise the metallic element platinum (Pt). Electrodes which have at least one of these base metals, in particular iridium and rhodium, proved to be superior to electrodes whose base metal comprises platinum with regard to various burnup mechanisms.
  • the electrode material may preferably comprise an alloy which has at least one further constituent in addition to the base metal.
  • the electrode material comprises, in addition to the base metal, at least one further metal, which is selected from the chemical elements platinum
  • Electrode material over a proportion of 0.5 wt.% Preferably from 1 wt.%, More preferably from 2.5 wt.%, More preferably from 5 wt.%, More preferably from 7.5 wt.%, To 15 wt .%, Preferably to 12.5 wt.%, More preferably to 10 wt.%, Which have at least one further metal.
  • the electrode material may have at least one additional to the base metal and to the at least one further metal Include ceramic oxide aggregate.
  • ceramic oxide supplement here refers to any ceramic oxide which can be added to the alloy without the alloy thereby losing its metallic character. As a ceramic oxide materials are referred to, which have ceramic properties that compared to metallic
  • the corrosion resistance of the electrode material can be increased significantly, which is particularly due to a stabilization of the alloy
  • Metal phases can be attributed to grain boundaries.
  • the ceramic oxide aggregate may be selected from yttria, zirconia, lanthana or thoria.
  • yttria, zirconia, lanthana or thoria For these oxides, a particularly high corrosion resistance-increasing effect is to be expected.
  • other oxides are possible, selected from
  • Alumina, titanium oxides, magnesium oxide, aluminum titanate and / or barium titanate are examples of titanium oxides, magnesium oxide, aluminum titanate and / or barium titanate.
  • the electrode material may have a content of 0% by weight, preferably 1% by weight, more preferably 2% by weight, more preferably 3% by weight, more preferably 4% by weight, up to 10% by weight. %, preferably up to 8% by weight, more preferably up to 6% by weight, more preferably up to 5% by weight, of the ceramic oxide aggregate. Regardless of the chosen composition, the respective ones complement each other
  • the sensor element can be configured in particular as a soot particle sensor.
  • the sensor element can thus have a mode of operation with temperatures in the regenerative phase of 850 ° C., preferably 950 ° C., more preferably 1050 ° C., and 1300 ° C., especially up to 1250 ° C, allow.
  • the sensor element can be accommodated in at least one protective tube.
  • a method for producing a sensor element for detecting particles of a measurement gas in a measurement gas space is proposed.
  • at least one first electrode device and at least one second electrode device will be applied to a carrier, the first electrode device and the second electrode device each having at least one electrode finger.
  • the electrode material can be applied by means of a thick film method known from the prior art, in particular by screen printing.
  • a thick film method known from the prior art, in particular by screen printing.
  • an adaptation of a grain size and / or of the ceramic oxide aggregate may be advantageous in order to reduce the sintering behavior of the electrode material described above to that of the prior art.
  • DE 102008042770 Al set known platinum / platinum cermet pastes.
  • the deposition process of a thin-film process in particular a sputtering, a
  • Vapor deposition or a galvanic process can be selected. However, an application of other deposition methods is also possible in principle.
  • the method can be used, in particular, for producing a sensor element according to the present invention, that is to say according to one of the above-mentioned
  • the proposed sensor element and the proposed method for its production have numerous advantages over known sensor elements and associated production methods.
  • the electrode material which, at least on the surface set up to be acted upon by the measuring gas can be used
  • Electrode finger of the sensor element is applied, reduce material removal due to chemical or physical processes such as evaporation or formation of volatile metal compounds, for example in the form of carbonyls or oxides, and at the same time a poisoning and
  • the associated manufacturing process can be a simple
  • FIG. 1 shows an embodiment of a sensor element 110 according to the invention for detecting particles of a measurement gas 112 in a measurement gas space in a plan view.
  • the sensor element 110 can be set up in particular for use in a motor vehicle.
  • the measurement gas 112 may be an exhaust gas of the motor vehicle.
  • Electrodes 110 may in particular include one or more, not shown in the figures, further functional elements, such as electrodes,
  • the sensor element 110 may for example be accommodated in a protective tube, also not shown.
  • the sensor element 110 comprises at least one carrier 114, wherein at least one first electrode device 116 and at least one second electrode device 118 are applied to the carrier.
  • the carrier 114 may comprise at least one ceramic material.
  • the carrier 114 may comprise at least one electrically insulating material.
  • the carrier 114 may have a carrier surface.
  • the first electrode device 116 and the second electrode device 118 each have at least one electrode finger 120.
  • the first electrode device 116 and the second electrode device 118 each have at least one electrode finger 120.
  • Electrode device 116 and the second electrode device 118 may each have two or, as shown in Figure 1, each more than two
  • Electrode fingers 120 of the second electrode means 118 engage each other.
  • the first electrode device 116 as well as the second electrode device 118 may also have a different structure.
  • the first electrode device 116 may be connected to the second electrode device 118
  • structure which may be selected from the group consisting of a comb structure, a herringbone structure, a zigzag structure and a winding structure.
  • FIG. 2 shows the embodiment of an electrode finger 120 of the FIG. 2
  • the electrode finger 120 in a cross-sectional view, wherein the electrode finger 120 is applied to the carrier 114.
  • the electrode finger 120 has a volume 122 and a surface 124 set up to be acted upon by the measurement gas 112.
  • the volume 122 of the electrode finger 120 or at least the surface 124 of the electrode finger comprises an electrode material 126, in particular in the form of an alloy, which comprises at least 50% by weight and preferably at most 95% by weight of a base metal, the base material is selected from the group consisting of palladium (Pd), iridium (Ir), ruthenium (Ru) and rhodium (Rh).
  • the base material is selected from the group consisting of palladium (Pd), iridium (Ir), ruthenium (Ru) and rhodium (Rh).
  • the electrode material 126 may contain, in addition to the base metal, a content of 0.5 wt.% To 15 wt.% Of at least one other metal selected from platinum (Pt), rhodium (Rh), ruthenium (Ru), rhenium (Re ), Palladium (Pd), cobalt (Co), iridium (Ir), gold (Au) and silver (Ag), with the selected additional metal being different from the selected base metal.
  • the electrode material 126 may include, in addition to the at least one base metal and the at least one further metal, a portion of
  • a ceramic oxide aggregate wherein the ceramic oxide aggregate is preferably composed of an oxide of yttrium (Y),
  • the electrode material 126 may preferably have one of the following compositions in weight percent, each supplementing to 100 percent by weight.
  • 8 exemplary compositions are given; however, according to the present invention, a variety of other compositions are possible:
  • Electrode finger 120 completely made of the electrode material 126.
  • at least the surface 124 of the electrode finger 120 which is adapted to be acted upon by the measurement gas 112, may comprise the electrode material 126.
  • Embodiments are possible; in particular, an embodiment in which the volume 122 of those electrode fingers 120, which are initially loaded on the carrier 114 with the measurement gas 112 due to their first spatial arrangement 128, consist entirely of the electrode material 126, while only the surfaces 124 those electrode fingers 120, which due to their second spatial arrangement 130 on the carrier 114 are last applied to the sample gas 112, the electrode material 126, while the remaining volume of the electrode fingers 120 in the second spatial arrangement 130 may have a differently composed, metallically conductive material.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (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 élément capteur (110) pour la détection de particules d'un gaz de mesure dans un espace de gaz de mesure. L'élément capteur (110) comprend au moins un support (114) sur lequel sont appliqués au moins un premier ensemble électrode (116) et au moins un second ensemble électrode (118). Le premier ensemble électrode (116) et le second ensemble électrode (118) présentent chacun au moins un doigt-électrode (120). Au moins une surface (124) des doigts-électrodes (120), conçue pour être exposée au gaz de mesure (112), présente un matériau d'électrode (126) qui contient au moins 50 % d'un métal de base choisi dans le groupe comprenant le palladium, l'iridium, le ruthénium et le rhodium.
PCT/EP2017/078027 2016-12-28 2017-11-02 Élément capteur pour la détection de particules d'un gaz de mesure dans un espace de gaz de mesure WO2018121905A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201780081458.6A CN110121642A (zh) 2016-12-28 2017-11-02 用于感测测量气体室中的测量气体的颗粒的传感器元件
KR1020197018620A KR102438819B1 (ko) 2016-12-28 2017-11-02 측정 가스 챔버 내의 측정 가스의 입자를 검출하기 위한 센서 요소

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016226275.0A DE102016226275A1 (de) 2016-12-28 2016-12-28 Sensorelement zur Erfassung von Partikeln eines Messgases in einem Messgasraum
DE102016226275.0 2016-12-28

Publications (1)

Publication Number Publication Date
WO2018121905A1 true WO2018121905A1 (fr) 2018-07-05

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Application Number Title Priority Date Filing Date
PCT/EP2017/078027 WO2018121905A1 (fr) 2016-12-28 2017-11-02 Élément capteur pour la détection de particules d'un gaz de mesure dans un espace de gaz de mesure

Country Status (4)

Country Link
KR (1) KR102438819B1 (fr)
CN (1) CN110121642A (fr)
DE (1) DE102016226275A1 (fr)
WO (1) WO2018121905A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114563059B (zh) * 2022-04-08 2024-11-19 北京华科仪科技股份有限公司 一种液位测量方法

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6361821B1 (en) * 2000-12-13 2002-03-26 Delphi Technologies, Inc. Method of treating an exhaust sensor and a product thereof
WO2003006976A2 (fr) 2001-07-10 2003-01-23 Robert Bosch Gmbh Detecteur servant a la detection de particules, et procede de reglage de son fonctionnement
DE10149333A1 (de) 2001-10-06 2003-05-08 Bosch Gmbh Robert Sensorvorrichtung zur Messung der Feuchtigkeit von Gasen
DE10319664A1 (de) 2003-05-02 2004-11-18 Robert Bosch Gmbh Sensor zur Detektion von Teilchen
DE10353860A1 (de) 2003-11-18 2005-06-09 Robert Bosch Gmbh Sensor zum Erfassen von Partikeln in einem Gasstrom, sowie Verfahren zu seiner Herstellung
DE102004046882A1 (de) 2004-09-28 2006-04-13 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine, sowie Sensoreinrichtung zur Erfassung einer Zustandsgröße im Abgas der Brennkraftmaschine
DE102006042362A1 (de) 2006-09-08 2008-03-27 Robert Bosch Gmbh Sensorelement für Gassensoren und Verfahren zum Betrieb desselben
DE102008042770A1 (de) 2008-10-13 2010-04-15 Robert Bosch Gmbh Material einer Cermet-Schicht für elektrochemische Gassensoren
DE102011006923A1 (de) * 2011-04-07 2012-10-11 Robert Bosch Gmbh Vorrichtung und Verfahren zur Diagnose der Funktion eines Partikelsensors
US9068913B2 (en) * 2009-05-11 2015-06-30 Heraeus Sensor Technology Gmbh Photolithographic structured thick layer sensor
DE102014211782A1 (de) * 2014-06-18 2015-12-24 Robert Bosch Gmbh Sensorelement zur Erfassung mindestens einer Eigenschaft eines Messgases in einem Messgasraum

Family Cites Families (6)

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AU2006341550A1 (en) * 2005-12-12 2007-10-18 Nextech Materials, Ltd. Ceramic H2S sensor
DE102007047078A1 (de) * 2007-10-01 2009-04-02 Robert Bosch Gmbh Sensorelement zur Detektion von Partikeln in einem Gas und Verfahren zu dessen Herstellung
JP5542006B2 (ja) * 2010-08-26 2014-07-09 日本碍子株式会社 粒子状物質検出装置
DE102014220791A1 (de) * 2014-10-14 2016-04-14 Robert Bosch Gmbh Sensor zur Bestimmung einer Konzentration von Partikeln in einem Gasstrom
JP6405969B2 (ja) * 2014-12-10 2018-10-17 株式会社デンソー 固体電解質体及びガスセンサ
KR20160124384A (ko) * 2015-04-17 2016-10-27 경원산업 주식회사 입자농도측정용 센서소자

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6361821B1 (en) * 2000-12-13 2002-03-26 Delphi Technologies, Inc. Method of treating an exhaust sensor and a product thereof
WO2003006976A2 (fr) 2001-07-10 2003-01-23 Robert Bosch Gmbh Detecteur servant a la detection de particules, et procede de reglage de son fonctionnement
DE10149333A1 (de) 2001-10-06 2003-05-08 Bosch Gmbh Robert Sensorvorrichtung zur Messung der Feuchtigkeit von Gasen
DE10319664A1 (de) 2003-05-02 2004-11-18 Robert Bosch Gmbh Sensor zur Detektion von Teilchen
DE10353860A1 (de) 2003-11-18 2005-06-09 Robert Bosch Gmbh Sensor zum Erfassen von Partikeln in einem Gasstrom, sowie Verfahren zu seiner Herstellung
DE102004046882A1 (de) 2004-09-28 2006-04-13 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine, sowie Sensoreinrichtung zur Erfassung einer Zustandsgröße im Abgas der Brennkraftmaschine
DE102006042362A1 (de) 2006-09-08 2008-03-27 Robert Bosch Gmbh Sensorelement für Gassensoren und Verfahren zum Betrieb desselben
DE102008042770A1 (de) 2008-10-13 2010-04-15 Robert Bosch Gmbh Material einer Cermet-Schicht für elektrochemische Gassensoren
US9068913B2 (en) * 2009-05-11 2015-06-30 Heraeus Sensor Technology Gmbh Photolithographic structured thick layer sensor
DE102011006923A1 (de) * 2011-04-07 2012-10-11 Robert Bosch Gmbh Vorrichtung und Verfahren zur Diagnose der Funktion eines Partikelsensors
DE102014211782A1 (de) * 2014-06-18 2015-12-24 Robert Bosch Gmbh Sensorelement zur Erfassung mindestens einer Eigenschaft eines Messgases in einem Messgasraum

Also Published As

Publication number Publication date
DE102016226275A1 (de) 2018-06-28
KR102438819B1 (ko) 2022-09-02
CN110121642A (zh) 2019-08-13
KR20190102195A (ko) 2019-09-03

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