EP3551989A1 - Capteur destiné à être utilisé dans un flux de gaz d'échappement d'un moteur à combustion interne et procédé de fabrication de celui-ci - Google Patents

Capteur destiné à être utilisé dans un flux de gaz d'échappement d'un moteur à combustion interne et procédé de fabrication de celui-ci

Info

Publication number
EP3551989A1
EP3551989A1 EP17808893.6A EP17808893A EP3551989A1 EP 3551989 A1 EP3551989 A1 EP 3551989A1 EP 17808893 A EP17808893 A EP 17808893A EP 3551989 A1 EP3551989 A1 EP 3551989A1
Authority
EP
European Patent Office
Prior art keywords
electrode
sensor
arrangement
assembly
electrode assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17808893.6A
Other languages
German (de)
English (en)
Inventor
Christoph Hamann
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.)
EmiSense Technologies LLC
Original Assignee
CPT Group 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 CPT Group GmbH filed Critical CPT Group GmbH
Publication of EP3551989A1 publication Critical patent/EP3551989A1/fr
Withdrawn legal-status Critical Current

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
    • 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
    • G01N2015/0042—Investigating dispersion of solids
    • G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke

Definitions

  • the present invention relates to a sensor for use in an exhaust stream of an internal combustion engine and a method for producing the same, in particular a particle sensor used in the exhaust stream of an internal combustion engine for determining the amount of particulates in the exhaust gas of the internal combustion engine.
  • sensors are arranged for different purposes.
  • Par ⁇ tikelsensoren, nitrogen oxide sensors, oxygen sensors and / or Lamdbasonden be used to detect different parameters in order to set optimizes the operating parameters of the internal combustion engine.
  • electrical and electronic components are frequently used, in which frequently different electrical potentials are applied during measuring operation.
  • an electric field is determined by the difference ⁇ handy electric potentials generated which, a so-called electro-migration may result in the component connections, such as solder joints, the bility the permanent of the component compound may be adversely affected.
  • the present invention is therefore based on the object to provide a sensor which can be used in the exhaust gas of an internal combustion engine and in which the durability of at least one existing within the sensor solder connection can be permanently ensured.
  • This object is achieved with a sensor according to independent claim 1 and a method according to independent claim 8. Preferred embodiments are specified in the subclaims.
  • a sensor for use in an exhaust stream of an internal combustion engine includes a first electrode assembly, an electrically insulated by an insulating arrangement of the first electrode assembly second electrode means and at least one Ver ⁇ binding arrangement, which is attached via at least one solder joint on the first electrode assembly and the insulation assembly.
  • the connection arrangement is designed to position the first electrode arrangement relative to the second electrode arrangement.
  • the at least one solder connection is arranged outside an electric field which is generated in the measuring operation of the sensor by applying a first electrical potential to the first electrode arrangement and by applying a second electrical potential different from the first electrical potential to the second electrode arrangement.
  • the first electrode arrangement preferably has a first sensor electrode and a second sensor electrode electrically connected to the first sensor electrode.
  • the idea of the invention essentially is to provide a (further) sensor electrode so that an electric field is shifted so that any previously disposed within such an electric field Lot ⁇ compounds after arranging this (additional) sensor electrode and the displacement of the electric Fields are arranged outside of it.
  • This solution is based on a large number of different sensors transferable. In particular, this solution is used in sensors that are used in hot exhaust gases of internal combustion engines or internal combustion systems.
  • Internal combustion engines or internal combustion engines are, for example, internal combustion engines for vehicles, such as cars, motorcycles,
  • connection arrangement is electrically conductive and designed to electrically connect the first sensor electrode of the first sensor arrangement to the second sensor electrode of the first sensor arrangement.
  • the second sensor electrode of the first sensor arrangement is preferably attached to the insulation arrangement.
  • the latter has an electrically insulated by means of the isolati ⁇ onsan eleven from the first electrode assembly and said second electrode array third electrode assembly, a third electrical potential is applied to the measurement in the operation of the sensor.
  • the second electrode arrangement comprises at least one guard electrode, which is adapted to derive leakage currents between the first electrode drive ⁇ UTHORISATION and the second electrode assembly.
  • the senor of the invention is an electrostatically ⁇ diagrammatic particle sensor which is adapted to the particle ⁇ quantity in the exhaust stream of the internal combustion engine to erffennund / or monitor the functioning of a particulate filter. Consequently, the first electrode arrangement, the second electrode arrangement and the third electrode arrangement, as is known for an electrostatic particle sensor, are also arranged relative to one another and are electrically separated from the insulation arrangement.
  • the present open ⁇ barung relates to a method of manufacturing a sensor, which is adapted to be used in an exhaust gas flow of an internal combustion engine. The method comprises arranging a first electrode arrangement, arranging a second electrode arrangement
  • An electrode assembly such that the second electrode assembly is electrically insulated from the first electrode assembly by means of an insulation arrangement, and a positioning of the first electrode assembly relative to the second electrode assembly by means of a connection assembly which is attached via at least one solder connection to the first electrode assembly and the insulation assembly.
  • the at least one solder connection is arranged outside an electric field which is generated in the measuring operation of the sensor by applying a first electrical potential to the first electrode arrangement and by applying a second electrical potential different from the first electrical potential to the second electrode arrangement.
  • the step of disposing a first electrode assembly comprises disposing a first sensor electrode and arranging a second sensor electrode electrically connected to the first sensor electrode.
  • the first sensor electrode of the first electrode arrangement and the second sensor electrode of the first electrode arrangement are arranged relative to one another such that an electric field would be generated in a fictitious application of different potentials between the first sensor electrode of the first electrode arrangement and the second sensor electrode of the first electrode arrangement to which the connection arrangement together with the soldered connections would at least partially be located.
  • the connection arrangement is electrically conductive and designed to electrically connect the first sensor electrode of the first electrode arrangement with the second sensor electrode of the first electrode arrangement.
  • Fig. 1 shows a sectional view along a longitudinal axis by a known sensor
  • Fig. 2 shows a sectional view along a longitudinal axis through a sensor according to the invention.
  • Nitrogen sensors oxygen sensors or lambda probes.
  • the sensor 100 has a substantially cylindrical housing 110 that extends substantially along a longitudinal axis 102.
  • the housing 110 may be conical or stepped.
  • the housing 110 has a threaded ⁇ deabêt to 112, by means of which the particle sensor at ⁇ in an exhaust passage of an internal combustion engine can be screwed 100 play (not shown).
  • the housing 110 has Further, a region 114, for example in the form of an external hex, to which a corresponding tool can be attached, so that the particle sensor 100 can be screwed into the exhaust passage of the internal combustion engine as desired.
  • a measuring region 120 is provided, which is formed between a first housing region 116, which is designed, in an installed state of the particle ⁇ sensor 100 at least partially into a gas stream (indicated by an arrow 10 in FIG. 1), flowing through the exhaust passage of the internal combustion engine, at least partially protruding, and a second housing portion 118 extends substantially along the longitudinal axis 102.
  • the first housing portion 116 describes a front end portion of the housing 110
  • the second housing portion 118 describes a housing portion of the housing 110 spaced from the first housing portion 116.
  • the measuring portion 120 is defined by the first housing portion 116 and the second housing portion 118 in a direction parallel to the first housing portion 116 Longitudinal axis 102 defined or defined.
  • the housing 110 further has a further, extending along the longitudinal axis 102 and the first housing portion 116 opposite housing portion 119 in which a contact receiving portion 122 is provided, in which at least partially electrical contacts (not shown) of the particle ⁇ sensor 100 can be accommodated , via which the particle ⁇ sensor 100 with, for example, a control unit of a
  • a first electrode assembly 130 is further arranged, which has a substantially cylindrical first Sen ⁇ sorelektrode 132, which is arranged coaxially to the longitudinal axis 102nd
  • the shape of the first sensor electrode 132 is not limited to the cylindrical shape and can be any other ge ⁇
  • the first sensor electrode 132 comprises a measuring section 133A arranged within the measuring area 120 as well as a connecting section 133B extending into the contact receiving area 122 along the longitudinal axis 102 through the second housing area 118, which is electrically connected to the measuring section 133A.
  • the measuring portion 133A is formed, for example, as a hollow cylindrical portion.
  • the connecting portion 133B is particularly adapted to electrically connect the measuring portion 133A
  • Contact receiving portion 122 arranged electrical contacts (not shown), via which the particle sensor 100 with z. B. the control unit of the vehicle can be connected.
  • the particulate sensor 100 further includes a second electrode drive ⁇ UTHORISATION 140 by an insulating assembly 160, which is formed in the embodiment shown in the Fig. 1 embodiment by way of example of three formed of ceramic material insulating elements 162, 164, 166, of the first electrode array 130 is electrically isolated.
  • the second electrode arrangement 140 has at least one guard electrode 142, which is electrically insulated from the first sensor electrode 132 of the first electrode arrangement 130 by means of the insulation arrangement 160.
  • the guard electrode 142 is electrically connected via a guard connection 144 to the electrical contacts (not shown) arranged in the contact receiving region 122.
  • the particle sensor 100 has a third electrode arrangement 150 which is electrically insulated from the first electrode arrangement 130 and the second electrode arrangement 140 by means of the insulation arrangement 160, which at least one is radial in the measuring area 120 with respect to the longitudinal axis 102 Direction outside the first sensor electrode 132 of the first electrode assembly 0
  • the sensor electrode 152 of the third electrode assembly 150 may have a conical or stepped shape.
  • the sensor electrode 152 of the third electrode arrangement 150 is the first electrode arrangement 130 disposed around the measurement section 133A of the first sensor electrode 132 such that a first flow path 104 between a radial inner wall 111 of the housing 110 and a radially outer wall 154 of the sensor electrode 152 of the third electric ⁇
  • the arrangement 150 is formed so that the gas flow through the first flow path 104 from the first housing portion 116 toward the second housing portion 118 flows, and a second flow path 106 between the first sensor electrode 132 of the first electrode assembly 130 and the sensor electrode 152 of the third electrode assembly 150 is formed is that the gas flow through the second flow path 106 from the second housing portion 118 toward the first housing portion 116 flows.
  • the housing 110 in the first housing region 116 has at least one inlet opening 101 and an outlet opening 103 extending along the longitudinal axis 102.
  • the particulate sensor 100 further includes at least one connection ⁇ assembly 170 (schematically shown in Fig. 1 respectively as points) via solder joints 172, 174 at the first electrode assembly 130, specifically at the first sensor electrode 132 of the first electrode array 130, and of the _
  • connection arrangement 170 is designed to be the first electrode ⁇ arrangement 130, more precisely, the first sensor electrode 132 of the first electrode assembly 130, relative to the second
  • Electrode assembly 140 more specifically to the at least one guard electrode 142 to position. Also, ensure a length compensation which is preferably formed from metallic material ⁇ connection arrangement 170, due to the different thermal expansions between the first electrode arrangement 130 and the isolation arrangement results 160th
  • Electrode assembly 130 a first electrical potential, applied to the second electrode assembly 140, a second electrical potential and to the third electrode assembly 150, a third electrical potential.
  • the first electrical potential is approximately 1,000 V
  • the second electrical potential about 1 V
  • the third electrical potential of approximately 0 V (that is at the third electrode arrangement 150, a ground potential is applied).
  • the second electrode arrangement 140 is used primarily for stabilizing the voltage conditions and electrical potentials in the particle sensor 100 and ensures that no leakage currents flow between the first electrode arrangement 130 and the third electrode arrangement 150 during the measuring operation of the particle sensor 100. Leakage currents are unwanted currents that flow due to insufficient insulation properties on the insulation assembly 160 in the measurement mode of the particle sensor 100 and thus significantly distort the measurement results of the particle sensor 100.
  • the second electrical potential of the second electrode assembly 140 is set slightly above the third electrical potential of the third electrode assembly 150.
  • any leakage currents present flow to the guard electrode 142 of the second electrode arrangement 140 and are dissipated there without influencing the current measurement of the particle sensor 100.
  • the leakage currents are made possible, for example, by moisture deposited on the insulation arrangement 160, which connects the first electrode arrangement 130 and / or the second electrode arrangement 140 and / or the third electrode arrangement 150 to one another.
  • an electric field is generated due to the different applied to the first electrode assembly 130 and the second electrode assembly 140 electrical potentials in which according to FIG. 1, the Ver ⁇ binding assembly 170 together with the solder 172, 174 are at least partially arranged.
  • This electric field may cause a so-called electromigration (also called solder migration) of the solder joints 172, 174, which may lead to a detachment of the connection arrangement 170 from the first electrode arrangement 130 and / or from the insulation arrangement 160.
  • electromigration can from the solder joints 172, 174 z.
  • B. dissolve silver, which diffuses radially outward by means of the electric field.
  • Electromigration or Lotmigration arises predominantly when a plurality of electrodes, each at a different potential is applied, by a conductive medium, for. B. liquid or conductive soot particles, are electrically connected to each other.
  • a conductive medium for. B. liquid or conductive soot particles
  • the ions released at the anode deposit at the cathode and form a conductive path towards the anode by dendrite growth.
  • the ions can deposit on the insulator surface. This can reduce the resistance of the insulator surface and even cause a short circuit.
  • an inventive sensor is exemplified as a particle sensor 100.
  • 1 OF INVENTION ⁇ dung proper particle sensor 100 of Fig. 2 differs from the known particle sensor 100 of FIG. That the first electrode arrangement 130 further comprises a second sensor electrode 134 which is electrically connected to the first sensor electrode 132 of the first electrode assembly 130.
  • the second sensor electrode 134 of the first sensor arrangement 130 is electrically connected via an electrical connection line 136 to the electrically conductive connection arrangement 170, which in turn is electrically connected to the first sensor electrode 132 of the first sensor arrangement 130.
  • the second sensor electrode 134 of the first electrode arrangement 130 is arranged in such a way that the connection element 170, in particular the solder connections 172, 174, are outside the electric field which is generated by applying the first electrical potential to the second sensor electrode 134 of the first electrode arrangement 130 and by applying the second electrical potential is generated at the second electrode assembly 140.
  • the second sensor electrode 134 is configured to be arranged such that the solder joints 172, 174 are field-free.
  • the second sensor electrode 134 of the first electrode arrangement 130 is a substantially cylindrical ring and arranged coaxially with the longitudinal axis 102.
  • the second sensor electrode 134 of the first electrode assembly 130 is attached to the insulation assembly 160 and electrically connected by means of the electrical connection line with the first sensor electrode 132 of the first electrode assembly 130.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Molecular Biology (AREA)
  • Biomedical Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

L'invention concerne un capteur (100) destiné à être utilisé dans un flux de gaz d'échappement d'un moteur à combustion interne et un procédé de fabrication de celui-ci. Le capteur (100) comporte un premier ensemble d'électrodes (130) et un second ensemble d'électrodes (130) isolé électriquement du premier ensemble d'électrodes (130) au moyen d'un dispositif d'isolation (160) et au moins un dispositif de connexion (170) qui est fixé par au moins un joint de soudure (172, 174) au premier ensemble d'électrodes (130) et au dispositif d'isolation (160) et qui est conçu pour positionner le premier ensemble d'électrodes (130) par rapport au second ensemble d'électrodes (140). L'au moins un joint de soudure (172, 174) est au moins partiellement disposé à l'extérieur d'un champ électrique qui est généré, dans l'opération de mesure du capteur (100), par application d'un premier potentiel électrique sur le premier ensemble d'électrodes (130) et par application d'un second potentiel électrique sur le second ensemble d'électrodes (140).
EP17808893.6A 2016-12-07 2017-12-04 Capteur destiné à être utilisé dans un flux de gaz d'échappement d'un moteur à combustion interne et procédé de fabrication de celui-ci Withdrawn EP3551989A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016224410.8A DE102016224410B4 (de) 2016-12-07 2016-12-07 Sensor zur Verwendung in einem Abgasstrom einer Brennkraftmaschine und Verfahren zum Herstellen desselben
PCT/EP2017/081304 WO2018104201A1 (fr) 2016-12-07 2017-12-04 Capteur destiné à être utilisé dans un flux de gaz d'échappement d'un moteur à combustion interne et procédé de fabrication de celui-ci

Publications (1)

Publication Number Publication Date
EP3551989A1 true EP3551989A1 (fr) 2019-10-16

Family

ID=60574592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17808893.6A Withdrawn EP3551989A1 (fr) 2016-12-07 2017-12-04 Capteur destiné à être utilisé dans un flux de gaz d'échappement d'un moteur à combustion interne et procédé de fabrication de celui-ci

Country Status (4)

Country Link
US (1) US11422081B2 (fr)
EP (1) EP3551989A1 (fr)
DE (1) DE102016224410B4 (fr)
WO (1) WO2018104201A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016224410B4 (de) 2016-12-07 2023-09-28 Emisense Technologies Llc Sensor zur Verwendung in einem Abgasstrom einer Brennkraftmaschine und Verfahren zum Herstellen desselben
DE112019000725T5 (de) * 2018-02-08 2020-11-05 Ngk Insulators, Ltd. Teilchennachweisvorrichtung

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999024826A1 (fr) 1997-11-10 1999-05-20 Central Research Laboratories Limited Detecteur de gaz
JP3895087B2 (ja) * 2000-02-01 2007-03-22 株式会社東芝 劣化診断方法
DE102005015103A1 (de) * 2004-09-30 2006-04-06 Robert Bosch Gmbh Partikelsensor und Verfahren zum Betrieb desselben
DE102006006112B4 (de) 2006-02-10 2024-01-11 Robert Bosch Gmbh Partikelsensor
DE202009004253U1 (de) 2009-03-31 2010-08-19 Hauser, Andreas, Dipl.-Ing. Vorrichtung zur Detektion von in einem Gasstrom enthaltenen Partikeln
DE102010044308A1 (de) * 2010-09-03 2012-03-08 Continental Automotive Gmbh Sensorelement für einen Partikelsensor
US8671736B2 (en) 2011-05-26 2014-03-18 Emisense Technologies, Llc Agglomeration and charge loss sensor for measuring particulate matter
US8713991B2 (en) 2011-05-26 2014-05-06 Emisense Technologies, Llc Agglomeration and charge loss sensor for measuring particulate matter
DE102014219555A1 (de) * 2014-09-26 2016-03-31 Continental Automotive Gmbh Rußsensor
DE102015217794B3 (de) * 2015-09-17 2016-12-29 Continental Automotive Gmbh Sensor und Verfahren zur Herstellung eines Sensors
DE102016201343B4 (de) * 2016-01-29 2023-09-21 Emisense Technologies Llc Sensor für ein Kraftfahrzeug und Verfahren zur Herstellung eines Sensors für ein Kraftfahrzeug
DE102016224410B4 (de) 2016-12-07 2023-09-28 Emisense Technologies Llc Sensor zur Verwendung in einem Abgasstrom einer Brennkraftmaschine und Verfahren zum Herstellen desselben

Also Published As

Publication number Publication date
US20190391062A1 (en) 2019-12-26
DE102016224410A1 (de) 2018-06-07
DE102016224410B4 (de) 2023-09-28
US11422081B2 (en) 2022-08-23
WO2018104201A1 (fr) 2018-06-14

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