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WO2008006640A1 - ÉLÉment de capteur pour un capteur de particules - Google Patents

ÉLÉment de capteur pour un capteur de particules Download PDF

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Publication number
WO2008006640A1
WO2008006640A1 PCT/EP2007/054987 EP2007054987W WO2008006640A1 WO 2008006640 A1 WO2008006640 A1 WO 2008006640A1 EP 2007054987 W EP2007054987 W EP 2007054987W WO 2008006640 A1 WO2008006640 A1 WO 2008006640A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
sensor element
protective frame
element according
measuring surface
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/EP2007/054987
Other languages
German (de)
English (en)
Inventor
Heiner Scheer
Hans-Joerg Renz
Sabine Roesch
Harald Koehnlein
Benjamin Gaertner
Ingrid Gerner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP07729425A priority Critical patent/EP2044415A1/fr
Publication of WO2008006640A1 publication Critical patent/WO2008006640A1/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
    • 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
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
    • 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
    • F01N2560/20—Sensor having heating means
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration
    • 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

Definitions

  • the invention is based on a sensor element for a particle sensor for the detection of particles contained in a gas stream, in particular of soot particles in the exhaust gas of an internal combustion engine, according to the preamble of claim 1.
  • a known particle sensor of this type (WO 03/006976 A2) is provided as so-called.
  • Soot sensor for installation in the exhaust system of an internal combustion engine and is preferably used in diesel internal combustion engines and there downstream of a soot filter in the exhaust system.
  • the particle sensor comprises a sensor element with a carrier of a highly insulating material, e.g. from a ceramic made of alumina
  • a measuring surface constructed as a resistance measuring structure is printed from two interdigital comb electrodes. Depending on one of the meshing with their comb teeth comb electrodes is connected via a conductor to a terminal for connection to a measuring and control unit. During operation, the measuring surface is directly exposed to the gas or exhaust gas flow. If the electrically conductive particles entrained in the gas or exhaust gas, such as soot particles, are deposited on the measuring surface, the resistance measured between the comb electrodes changes. From the change over time of the resistance, the particle concentration in the gas or the soot particle concentration in the exhaust gas is determined in the measuring and control unit. For regeneration of the sensor element, the accumulated particles are burned from time to time by means of the heating element.
  • the sensor element according to the invention for a particle sensor for the detection of particles contained in a gas stream has the advantage that the measuring surface exposed on the surface of the carrier during handling of the sensor element, starting from its sintering until final installation in the particle sensor, through the protective frame is largely protected against mechanical damage of all kinds.
  • the protective frame surrounding the measuring surface is mechanically and thermally very stable and firmly connected to the carrier and prevents manufacturing or assembly tools can reach the measuring surface and cause scratches or scoring there. Even when storing the sensor element, the protective frame ensures that no damage to the measuring surface occur during storage or retrieval in or out of the storage magazine.
  • the protective frame is applied directly to the carrier.
  • Carrier and protective frame consist of ceramic material, preferably aluminum oxide, and are integrally connected to one another by sintering the sensor element.
  • the protective frame is preferably printed in the green state of the ceramic support on these in the screen printing process. The printing takes place in the same printing step as the printing of a cover layer via conductor tracks on the surface of the ceramic support duri fenden connecting the measuring surface with terminal contacts.
  • the covering layer covers the entire area of the surface of the carrier in which the conductor tracks extend.
  • FIG. 1 shows a plan view of a sensor element for a particle sensor
  • FIG. 2 shows a side view of the sensor element in FIG. 1.
  • the sensor element of a particle sensor shown in FIG. 1 in plan view and in FIG. 2 for detecting particles contained in a gas flow preferably a so-called soot sensor for detecting soot particles and for determining the soot concentration in the exhaust gas of an internal combustion engine, in particular one Diesel internal combustion engine, has a plate-like carrier 11 made of a highly insulating material, in the embodiment of a ceramic material such as alumina (Al 2 O 3 ), and arranged on the surface 111 of the carrier 11 structured measuring surface 12 of platinum, which is printed on the support 11 is.
  • the measuring surface 12 is open on the support 11, so it is uncovered and exposed directly to the gas flow during operation.
  • the structured measuring surface 12 consists of two so-called.
  • Interdigital electrodes which are comb electrodes 13, 14 which are arranged on the carrier 11 so that they mesh with each other with their comb teeth spaced apart.
  • Each comb electrode 13 or 14 is connected via a running on the surface 111 of the carrier 11 trace 15 and 16 with a terminal contact 17 and 18 respectively.
  • the sensor element is connected to a measuring and control unit.
  • the surface area of the carrier 11 between the two connection contacts 17, 18 on the one hand and the measuring surface 12 on the other hand is coated with a covering layer 19 of aluminum oxide (Al 2 O 3 ), so that the conductor tracks 15, 16 are completely covered.
  • the measuring surface 12 is surrounded by a protective frame 20 made of ceramic material, which is applied directly to the carrier 11.
  • a ceramic material in turn alumina (Al 2 O 3 ) is used.
  • the application of the protective frame 20 is carried out by screen printing on the present in the green state carrier 11, ie prior to sintering of the provided with the measuring surface 12 carrier 11.
  • an alumina paste is printed on the carrier 11, in the manufacture of the protective frame 20 same printing step in which the cover layer 19 is printed on the surface area between the terminal contacts 17, 18 and the measuring surface 12.
  • cover layer 19 and protective frame 20 are integrally connected to each other, wherein the protective frame 20 attaches to the cover 19 and along three edges of the support 11 extends.
  • the protective frame 20 is arranged so that it is retained during the subsequent edge grinding of the sintered sensor element. Preferably, by the edge grinding, the protective frame 20 is flush with the edges of the carrier 11.
  • the thickness of the protective mens 20, ie the order of the protective frame 20 on the surface 111 of the carrier 11 is at least equal to the thickness of the measuring surface 2 dimensioned, preferably equal to the thickness of the coated on the support 11 cover layer 19, so that there is a flat top of the sensor element.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

La présente invention concerne un élément de capteur pour un capteur de particules destiné à détecter les particules contenues dans un flux de gaz, en particulier les particules de suie dans les gaz d'échappement d'un moteur à combustion interne, lequel élément comprend un support (11) et une surface de mesure (12) disposée sur la surface (111) du support (11), pouvant être exposée au flux de gaz. Afin de protéger la surface de mesure (12) de détériorations mécaniques lors du coffrage et de la pose de l'élément de capteur, la surface de mesure (12) est entourée par un cadre de protection (20), qui est constitué d'un matériau en céramique et est appliqué sur le support (11), de préférence imprimé, et fritté conjointement avec celui-ci.
PCT/EP2007/054987 2006-07-14 2007-05-23 ÉLÉment de capteur pour un capteur de particules Ceased WO2008006640A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07729425A EP2044415A1 (fr) 2006-07-14 2007-05-23 Element de capteur pour un capteur de particules

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006032741.1 2006-07-14
DE102006032741.1A DE102006032741B4 (de) 2006-07-14 2006-07-14 Sensorelement für einen Partikelsensor

Publications (1)

Publication Number Publication Date
WO2008006640A1 true WO2008006640A1 (fr) 2008-01-17

Family

ID=38435020

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/054987 Ceased WO2008006640A1 (fr) 2006-07-14 2007-05-23 ÉLÉment de capteur pour un capteur de particules

Country Status (3)

Country Link
EP (1) EP2044415A1 (fr)
DE (1) DE102006032741B4 (fr)
WO (1) WO2008006640A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020200542A1 (fr) * 2019-04-04 2020-10-08 Robert Bosch Gmbh Capteur de gaz pour détecter au moins une propriété d'un gaz

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010044308A1 (de) 2010-09-03 2012-03-08 Continental Automotive Gmbh Sensorelement für einen Partikelsensor
DE102012217428A1 (de) * 2012-09-26 2014-03-27 Robert Bosch Gmbh Sensor zur Detektion von Teilchen
DE102014208736A1 (de) 2014-05-09 2015-11-26 Robert Bosch Gmbh Sensor zur Detektion von Teilchen
DE102014220791A1 (de) 2014-10-14 2016-04-14 Robert Bosch Gmbh Sensor zur Bestimmung einer Konzentration von Partikeln in einem Gasstrom

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
WO2004097392A1 (fr) * 2003-05-02 2004-11-11 Robert Bosch Gmbh Capteur pour detecter des particules
WO2006027288A1 (fr) * 2004-09-07 2006-03-16 Robert Bosch Gmbh Element de detection pour capteurs de particules et procede d'exploitation correspondant
WO2006111459A1 (fr) * 2005-04-22 2006-10-26 Robert Bosch Gmbh Element de detection pour des capteurs de particules et procede pour l'exploiter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
WO2004097392A1 (fr) * 2003-05-02 2004-11-11 Robert Bosch Gmbh Capteur pour detecter des particules
WO2006027288A1 (fr) * 2004-09-07 2006-03-16 Robert Bosch Gmbh Element de detection pour capteurs de particules et procede d'exploitation correspondant
WO2006111459A1 (fr) * 2005-04-22 2006-10-26 Robert Bosch Gmbh Element de detection pour des capteurs de particules et procede pour l'exploiter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020200542A1 (fr) * 2019-04-04 2020-10-08 Robert Bosch Gmbh Capteur de gaz pour détecter au moins une propriété d'un gaz

Also Published As

Publication number Publication date
DE102006032741B4 (de) 2023-02-02
EP2044415A1 (fr) 2009-04-08
DE102006032741A1 (de) 2008-01-17

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