WO2008028715A1 - Capteur pour la détection de particules comprenant un dispositif de contrôle pour la vérification de la qualité d'une couche isolante - Google Patents

Capteur pour la détection de particules comprenant un dispositif de contrôle pour la vérification de la qualité d'une couche isolante Download PDF

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Publication number
WO2008028715A1
WO2008028715A1 PCT/EP2007/057156 EP2007057156W WO2008028715A1 WO 2008028715 A1 WO2008028715 A1 WO 2008028715A1 EP 2007057156 W EP2007057156 W EP 2007057156W WO 2008028715 A1 WO2008028715 A1 WO 2008028715A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
insulating layer
test device
electrode system
sheet
Prior art date
Application number
PCT/EP2007/057156
Other languages
German (de)
English (en)
Inventor
Hans-Joerg Renz
Sabine Roesch
Stefan Rodewald
Marten Mamey
Benjamin Gaertner
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2008028715A1 publication Critical patent/WO2008028715A1/fr

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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

Definitions

  • Sensor for detecting particles comprising a test device for checking the nature of an insulating layer
  • the invention is based on a sensor for the detection of particles in a gas stream, in particular of soot particles in an exhaust gas stream, according to the type defined in greater detail in the preamble of patent claim 1.
  • the concentration of conductive particles can be measured by means of two or more comb-like interdigitated metal electrodes (interdigital electrode system, comb electrode), which are arranged on an electrically insulating ceramic layer .
  • Sensors based on such a principle, which is to be classified as a collecting principle, are referred to as resistive particle sensors.
  • the measurement of the particle concentration can be carried out, for example, by measuring the decreasing in the case of particle deposition electrical resistance of the two electrodes separating insulating ceramic layer.
  • the sensor element can be freed by means of an integrated heater of the accumulated particles.
  • Such sensors are described by DE 101 493 33 A1 and WO 2003006976 A2.
  • At least A test device for checking the nature, in particular the insulating effect, has at least one insulating layer has the advantage that one or more insulation layers of a sensor element independently and clearly on their condition or quality, for example, in terms of insulation resistance and hole freedom can be checked , This is for the quality of the sensor measuring cell and the
  • test device can therefore serve the quality inspection and assurance.
  • erroneous measurements occurring at a later time for example during a process chain or in a vehicle, can be avoided by a test device according to the invention.
  • the sensor according to the invention can be arranged and used for example in an exhaust gas stream of a motor vehicle with a diesel engine or an oil heater. Since in the near future, the particulate emissions, in particular of vehicles during driving after passing through an engine or diesel particulate filter (DPF), must be monitored by law (On).
  • the present invention offers, in addition to a possibility of such monitoring of particle emissions, the advantage of a load prognosis of diesel particle filters, which is needed for regeneration control and by means of which high system safety can be achieved.
  • Figure 1 shows an exploded view of a preferred embodiment of a sensor according to the invention with included tester for checking the condition, in particular the insulating effect, at least one insulating
  • FIG. 1 shows a preferred embodiment of a sensor (1) according to the invention for
  • the test device (4) serves to check the condition, in particular the insulating effect, of the insulating layers (3) and (6).
  • the test apparatus comprises a sheet-like element (8), a line element (9), a further sheet-like element (10), two further line elements (11) and (12) and two current measuring instruments (13) and (14).
  • the circuit of the test device (4) is in this case with the line element (15) of the electrode system or the line element
  • test apparatus (4) connected electrically conductive support member (5) is also involved in the function of the test apparatus.
  • the electrode system (2), the insulating layers (3), the test device (4) and the carrier element (5), the insulating layer (6) and the heating device (7) are in the form of mutually parallel planes in the order electrode system (2), insulating layer (3),
  • Test device (4), support element (5), insulating layer (6) and heating device (7) build on each other.
  • planar element (8) of the test device (4) is arranged below or above the area (17) of the electrode system (2) relevant to the detection of particles, which has its own current measuring instrument (18).
  • the sheet-like element (8), the line element (9) and the further sheet-like element (10) of the test device (4) in the present embodiment by the insulating layer (3) and the support element (5) are included, has the insulating Layer (3) in this embodiment via a recess (19) through which this through the further line element (11) of - A -
  • Tester can be connected to the current measuring instrument (13) of the tester.
  • the area (20) of the heating device (7) relevant for the heating is below or above, in particular centrally below or above, to that relevant for the detection
  • the senor according to the invention for the detection of particles in a gas stream comprises at least one electrode system with at least two, in particular comb-like interlocking, electrodes and at least one insulating layer and a heating device and is characterized in that it additionally comprises at least one test device for Checking the condition, in particular the insulating effect, which has at least one insulating layer.
  • the test device comprises at least one sheet-like element and at least one line element.
  • the test device comprises a further sheet-like element.
  • the test device comprises at least one further line element and at least one current measuring instrument.
  • the test device is connected to the line element of the test apparatus or optionally to the further sheet-like element of the test apparatus by the at least one further line element to the at least one current measuring instrument.
  • the sheet-like element and the first line element and optionally the second sheet-like element are located in a plane.
  • the test device according to the invention comprises a carrier element.
  • the plane of the sheet-like element, the conduit element and optionally the second planar element lies parallel to the plane of the carrier element.
  • the sheet-like element, the conduit element and optionally the second planar element are in contact with the carrier element.
  • the line member and the optionally second sheet-like element is also a parallel plane of the insulating layer to be tested. Stand with this insulating layer sheet-like element, the conduit member and the second sheet-like element of the test device according to the invention also in contact.
  • the level of an electrode system On the side facing away from the electrode system of the support member is a the
  • Carrier element also parallel further insulating layer of the same size.
  • the senor according to the invention comprises a heating device which follows the further insulation layer on the side remote from the electrode system and the carrier element. The relevant area for heating the
  • Heating device is preferably arranged below or above the relevant for the detection of particles surfaces of the electrode system.
  • the test apparatus For the measuring characteristics of the test apparatus, it is not necessary for the test apparatus to cover the entire area of the insulating layer or the electrode system or the heating device.
  • the surface of the carrier element expediently covers the entire surface of the insulating layer or of the electrode system.
  • the further planar elements of the test apparatus can be arranged such that the layers lying above or below the plane of the sheet-like element have recesses through which the at least one further line element passes and the line element of the test device or the optionally further sheet-like element and thus the line element the test device can be connected to the at least one current measuring instrument.
  • the sheet-like element, the line element and the optionally further sheet-like element of the test device according to the invention for checking the condition, in particular the insulating effect, of at least one insulating layer consist of an electrically conductive and high-temperature-stable material.
  • high temperature bar means that the material does not lose any of the properties required for the purpose of the invention up to a temperature of, for example, about 1200 ° C.
  • semiconductors or metals for example transition metals such as Platinum, copper, silver, gold, iron,
  • the line element and optionally further psycholinige element of the test device consist of as little material and are designed as thin as it is without having adverse effects on the measurement characteristics of the tester is possible.
  • Thickness of the sheet-like element in a range of about 5 to about 100 microns, for example in a range of about 10 to about 30 microns, in particular in a range of about 15 to about 20 microns.
  • Length and width of the further sheet-like element in a range of about 1000 to about 2000, for example in a range of about 1100 to about 1900, in particular in a range of about 1200 to about 1300 microns and the thickness of the sheet-like element in a range of about 5 to about 100 microns, for example in a range of about 10 to about 30 microns, in particular in a range of about
  • the conducting element of the testing device according to the invention is a narrow band of a length in a range of about 30,000 to about 48,000, for example in a range of about 35,000 to about 45,000, in particular in a range of about 39,990 to about 40,010 microns.
  • this has a width in a range of about 50 to about 2000, for example in a range of about 100 to about 500, in particular in a range of about 190 to about 210 microns and a thickness in a range of about 5 to about 100, for example in one Range of about 10 to about 30, in particular in a range of about 15 to about 20 microns.
  • the carrier element according to the invention consists of a conductive material.
  • the carrier element is based on a ceramic material, for example on ZrÜ 2 , which is conductive, in particular due to a doping, for example with yttrium.
  • the conductivity of the carrier element material can be adjusted specifically.
  • the carrier element material has a conductivity in a range of about 0.01 to about 100, for example in a range of about 0.1 to about 50, more preferably in a range of about 1 to about
  • the carrier element can be designed in the form of a film.
  • the support member has a thickness in a range of about 0.3 to about 0.7 mm, for example in a range of about 0.4 to about 0.6 mm, in particular in a range of about 0.45 up to about 0.55 mm.
  • the insulating layer consists of a plate or layered substrate.
  • the plate-like or layered substrate is also an insulating material, for example a ceramic or a glass, in particular Al 2 O 3 .
  • the insulating layer has a plate or layer thickness in a range of about 1 to about 100 microns or from about 10 to about 50 microns, in particular from about 20 to about 40 microns.
  • the electrode system can be printed on the insulating layer in a simple manner by methods such as the screen printing method.
  • the electrode system with at least two, in particular comb-like interlocking, electrodes may have a so-called interdigital structure and be, for example, a comb electrode.
  • the at least two comb-like interlocking electrodes of the electrode system have, for example, distances in a range from about 10 to about 400 or from about 190 to about 210, in particular from about 70 to about 80.
  • the planar element of the test device according to the invention is arranged below or above, in particular centrally below or above, the area of the electrode system which is relevant for the detection.
  • the sensor according to the invention for the detection of particles, in particular of soot particles, in a gas stream is based on the principle of a resistance measurement on an electrode system with operational particle accumulation.
  • the rising Concentration of the particles deposited on the sensor surface leads in the case of an alternating current arrangement to a reduction of the impedance or, in the case of a DC arrangement, to a decrease in the resistance of the electrode system. This is associated with an increase in the current flow at constant applied voltage.
  • Resistance of the electrode system can be measured and correlated with the accumulated particle mass and thus also with the prevailing in the exhaust gas particle concentration or the particle mass flow.
  • the accumulated particle mass, in particular soot mass by the definition of a threshold (trigger threshold) and measurement of a collection time to reach this
  • Threshold be determined.
  • the sensor according to the invention moreover comprises, preferably an integrated heating device known from the lambda probe.
  • the heater comprises a heater insulation.
  • the relevant for the heating surface of the heater below or above, in particular centrally below or above, the relevant for the detection surfaces of the electrode system or the sheet-like element of the test device is arranged.
  • a plate capacitor may be formed on the electrodes of the sensor.
  • a plate capacitor whose plates are preferably formed parallel to the insulating layer, increased capacity can be realized.
  • such a plate capacitor is formed with a Dilelektrikum, wherein the dielectric may be, for example, Al 2 O 3 .
  • the senor may have a catching sleeve which at least partially covers the electrode system.
  • a collecting sleeve is made of a highly insulating material, for example of a ceramic such as Al 2 O 3 .
  • the senor according to the invention is based on a ceramic multilayer technology known from lambda sensors.

Abstract

La présente invention concerne un capteur (1) pour la détection de particules dans un courant gazeux. Le capteur comporte au moins un dispositif de contrôle (4) pour la vérification de la qualité, en particulier l'action isolante, d'au moins une couche isolante (3).
PCT/EP2007/057156 2006-09-08 2007-07-12 Capteur pour la détection de particules comprenant un dispositif de contrôle pour la vérification de la qualité d'une couche isolante WO2008028715A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610042361 DE102006042361A1 (de) 2006-09-08 2006-09-08 Sensor zur Detektion von Teilchen umfassend eine Prüfvorrichtung zur Überprüfung der Beschaffenheit einer isolierenden Schicht
DE102006042361.5 2006-09-08

Publications (1)

Publication Number Publication Date
WO2008028715A1 true WO2008028715A1 (fr) 2008-03-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/057156 WO2008028715A1 (fr) 2006-09-08 2007-07-12 Capteur pour la détection de particules comprenant un dispositif de contrôle pour la vérification de la qualité d'une couche isolante

Country Status (2)

Country Link
DE (1) DE102006042361A1 (fr)
WO (1) WO2008028715A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2956435A1 (fr) * 2010-02-16 2011-08-19 Electricfil Automotive Procede et dispositif pour determiner l'etat de fonctionnement d'une sonde de mesure de la quantite de suie dans les gaz d'echappement d'un vehicule

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007046096A1 (de) * 2007-09-26 2009-04-02 Robert Bosch Gmbh Verfahren zur Eigendiagnose eines Partikelsensors, zur Durchführung des Verfahrens geeignete Partikelsensoren sowie deren Verwendung
DE102015225739B4 (de) * 2015-12-17 2019-09-12 Continental Automotive Gmbh Verfahren zum Betreiben eines elektrostatischen Rußsensors
DE102016221372A1 (de) * 2016-10-28 2018-05-03 Robert Bosch Gmbh Sensorelement zur Bestimmung von Partikeln in einem fluiden Medium
DE102017207781A1 (de) * 2017-05-09 2018-11-15 Robert Bosch Gmbh Sensorelement zur Erfassung von Partikeln eines Messgases in einem Messgasraum

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893230A (en) * 1971-11-15 1975-07-08 Ford Motor Co Method of manufacture of an exhaust gas sensor for an air-fuel ratio sensing system
WO1983004109A1 (fr) * 1982-05-17 1983-11-24 Motorola, Inc. Bloc pour test de controle accelere d'une memoire
US6088608A (en) * 1997-10-20 2000-07-11 Alfred E. Mann Foundation Electrochemical sensor and integrity tests therefor
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
US20050279084A1 (en) * 2004-06-18 2005-12-22 Ralf Schmidt Method and apparatus for the defined regeneration of sooty surfaces
WO2006077197A1 (fr) * 2005-01-21 2006-07-27 Robert Bosch Gmbh Element de detection pour des capteurs de particules et procede pour l'exploiter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893230A (en) * 1971-11-15 1975-07-08 Ford Motor Co Method of manufacture of an exhaust gas sensor for an air-fuel ratio sensing system
WO1983004109A1 (fr) * 1982-05-17 1983-11-24 Motorola, Inc. Bloc pour test de controle accelere d'une memoire
US6088608A (en) * 1997-10-20 2000-07-11 Alfred E. Mann Foundation Electrochemical sensor and integrity tests therefor
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
US20050279084A1 (en) * 2004-06-18 2005-12-22 Ralf Schmidt Method and apparatus for the defined regeneration of sooty surfaces
WO2006077197A1 (fr) * 2005-01-21 2006-07-27 Robert Bosch Gmbh Element de detection pour des capteurs de particules et procede pour l'exploiter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2956435A1 (fr) * 2010-02-16 2011-08-19 Electricfil Automotive Procede et dispositif pour determiner l'etat de fonctionnement d'une sonde de mesure de la quantite de suie dans les gaz d'echappement d'un vehicule
WO2011101586A1 (fr) * 2010-02-16 2011-08-25 Electricfil Automotive Procede et dispositif pour determiner l'etat de fonctionnement d'une sonde de mesure de la quantite de suie dans les gaz d'echappement d'un vehicule

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