EP2238435A2 - Device for detecting radial cracks in a particulate filter - Google Patents
Device for detecting radial cracks in a particulate filterInfo
- Publication number
- EP2238435A2 EP2238435A2 EP08863593A EP08863593A EP2238435A2 EP 2238435 A2 EP2238435 A2 EP 2238435A2 EP 08863593 A EP08863593 A EP 08863593A EP 08863593 A EP08863593 A EP 08863593A EP 2238435 A2 EP2238435 A2 EP 2238435A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- conductive material
- strip
- wire
- electrically conductive
- 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- Withdrawn
Links
Classifications
-
- 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
-
- 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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the invention relates to the field of particulate filters especially used in an exhaust line of an engine for the removal of soot produced by the combustion of a diesel fuel in an internal combustion engine. More specifically, the invention relates to a device for detecting radial cracks in a honeycomb particle filter used in particular in an exhaust line of an internal combustion engine in an automobile or truck or a stationary system .
- Filtration structures for soot contained in the exhaust gas of an internal combustion engine are well known in the prior art. These structures most often have a honeycomb structure, one of the faces of the structure for the admission of the exhaust gases to be filtered and the other side the exhaust of the filtered exhaust gases.
- the structure comprises, between the intake and discharge faces, a set of adjacent ducts of axes parallel to each other separated by porous filtration walls, which ducts are closed at one or the other of their ends to delimit entry chambers opening on the admission face and exit chambers opening on the evacuation face.
- the peripheral portion of the structure may be surrounded by a cement, called coating cement or outer coating in the following description.
- the channels are alternately closed in an order such that the exhaust gases, during the crossing of the honeycomb body, are forced to pass through the sidewalls of the inlet channels to join the outlet channels. In this way, particles or soot are deposited and accumulate on the porous walls of the filter body.
- the filter bodies are based on a porous ceramic material, for example cordierite or silicon carbide, or aluminum titanate.
- the particulate filter is subjected to a succession of filtration (soot accumulation) and regeneration phases.
- soot particles emitted by the engine are retained and are deposited inside the filter.
- soot particles are burned inside the filter, in order to restore its filtration properties.
- the porous structure is then subjected to intense thermal and mechanical stresses, which can cause micro-cracking likely over time to cause a severe loss of filtration capacity of the unit, or even its complete deactivation. This phenomenon is particularly observed on monolithic filters of large diameter or of great length.
- said parts are synthesized on the basis of the same material, most often silicon carbide SiC or cordierite or aluminum titanate. This choice also makes it possible to homogenize the distribution of heat during the regeneration of the filter.
- the expression "at the base of the same material” is meant in the sense of the present description that the material consists of at least 25% by weight, preferably at least 45% by weight and very preferably at least 70% by weight of said material.
- soot filters as previously described are mainly used on a large scale in the exhaust gas pollution control devices of a diesel engine in automobiles or trucks or a stationary system.
- radial cracks may appear during poorly controlled regeneration or during spontaneous regeneration in the filter.
- the local temperature of the filter can reach temperatures higher than 800 ° C., with a strong spatial inhomogeneity of the temperatures leading to the appearance of cracks whose impact is more or less important on the integrity and filtration capabilities of the filter.
- large radial cracks which may cover the entire filter, may appear.
- Such cracks known as "ring off" cracks in the trade, develop in a radial plane along a section of the filter.
- the pressure exerted by the metal cladding can add iso-radial mechanical stresses relative to the filter axis likely to aggravate this cracking phenomenon.
- This type of cracking can in particular lead over time to a separation of the filter in two parts, which leads to a sudden and strong loss of filtration capacity, otherwise unacceptable compared to current antipollution standards.
- to this sharp reduction in the filtration capacity can be added contamination by unfiltered soot of the pollution control bodies downstream of the filter. Damage to the filter, which loses its pressure drop characteristics, also leads to problems in regulating the operation of the filter. motor when it is regulated according to a minimum threshold of pressure loss.
- the thermal gradients occur during the regeneration of the filter, in particular during the increase in temperature related to the combustion of soot: the average temperature of the filter is then between 400 and 1300 ° C.
- the temperature of the filter The filter is usually higher in the center than at the filter's periphery. This gradient is higher or lower depending on the physical and thermal characteristics of the filter.
- Such a phenomenon is for example described in the publication SAE 2006-01-1527 to which reference may be made according to the invention.
- the problem of appearance of the so-called ring off radial cracks is even more important, with a constant thermal gradient, for a monolithic filter made with a material having a high dilatometric coefficient with regard to its mechanical strength characteristics.
- the particulate filters must be removed periodically from the exhaust line for be cleaned with the filtering device to eliminate unburned residues from combustion and prolong their life.
- This operation generally consists of chemical treatments (selective etching of the deposition of residues) and / or mechanical (air or liquid blowing through the outlet channels), hot or at room temperature.
- the stresses applied during this cleaning can also lead to damage to the filter and help initiate and / or propagate ring-off type cracks initiated during the previous use in the exhaust line.
- the filters thus damaged after cleaning, when they are reinstalled on the vehicle, can then have the same disadvantages as described above, that is to say problems of filtration efficiency, pressure drop) with the same consequences.
- the detection device In order to avoid these problems, and it is the object of the present invention, it is necessary to have a simple and effective system for detecting the occurrence of such cracks and this from their initiation and / or their propagation , in order to prevent the catastrophic rupture of the filter and the premature change in concession.
- the detection device also makes it possible to know the origin of the failure.
- Electrically conductive systems are known for either in the assembly cement or in the outer coating to reduce the thermal gradient undergone by the filter especially during the regeneration phase. These systems have high resistivity in order to achieve joule heating. However, they do not allow to detect the initiation and / or propagation of cracks.
- a radial crack detection device called "ring-off", simple effective and non-intrusive, and likely to be applied to any type of filter, monolithic or assembled, whatever the material at the base of said filter.
- the invention relates to such a device, which also has the advantage of being directly applied to a particle filter during its use, that is to say directly on the automobile exhaust line.
- the device according to the invention allows a simple and immediate way of controlling the integrity of a filter out of the exhaust line, for example after a residue removal phase on a truck filter. .
- the invention relates to an assembly consisting of a device for detecting radial cracks on a honeycomb type particle filter, the filtering portion of which consists of a porous inorganic material, said particulate filter comprising a single monolithic element or being obtained by the association, by bonding with a joint cement, of a plurality of monolithic elements in honeycomb, said filter being able to be moreover covered with a coating cement, the device comprising: an electrically conductive material disposed in the form of a strip or wire on at least a longitudinal portion of the filter, said conductive material being integral with a monolithic element and / or a coating cement or a joint cement , said conductive material having an electrical conductivity greater than that of the constituent material of the filter portion of which it is integral and a resistance the stress, especially at a temperature between ambient and 1200 0 C, less than or equal to that of the material constituting the portion of the filter which it is secured, means for measuring the conductivity or the electrical resistance of the strip or wire of
- the strip or wire of conductive material is disposed in at least one central position along the length of the filter and preferably peripheral according to the radius or the width of the filter.
- the resistance of the electrically conductive material measured in ohms, is at least 10 times lower than that of the material constituting the portion of the filter with which it is integral, at a temperature of less than or equal to 800 ° C., and preferably at less than 100 times less than that of the constituent material of the portion of the filter which it is fast with, at a temperature of less than or equal to 600 ° C.
- the ratio of the modulus of rupture to the modulus of elasticity of the electrically conductive material is at least 1.1 times less than that of the constituent material of the portion of the filter with which it is integral and preferably at least 2 times smaller than that of the constituent material of the part of the filter which it is secured.
- the electrically conductive material constituting the strip or the wire comprises at least one element most often selected from the group consisting of metallic or ceramic conductors.
- the electrically conductive material is constituted by a wire or a metal ribbon disposed in contact and made integral with a monolithic element and / or preferably, coating cement or joint cement especially Chromel® or Alumel® or Inconel® type wires or other refractory metal.
- the electrically conductive material is constituted by a strip of a ceramic material comprising particles of an electrically conductive material chosen from metals of the Fe, Ni, Si, Cr, W group, metal alloys, in particular Alumel, Inconel, NiCr, FeCr, SiCr, MoSi2, or metal oxides of the type SnC> 2, Fe2O3, or carbides, especially WC, B4C, SiC, or the electrically conductive carbon such as carbon graphite.
- the ceramic material constituting the electrically conductive material may be based on the same material as the constituent material of the portion of the filter with which it is integral.
- the electrically conductive material is constituted by a band of a network of percolating conductive particles deposited on the constituent material of the filter of which it is integral, said particles being preferably chosen from Fe, Ni, Si group metals. , Cr, W, metal alloys, in particular Alumel, Inconel, NiCr, FeCr, SiCr, MoSi2, or metal oxides such as SnC> 2, Fe2O3, or certain carbides, in particular WC, B4C, SiC, or conductive carbon electric such as carbon graphite.
- the wire or the strip of conductive material may be disposed at the periphery of the coating cement or embedded in the coating cement.
- the conductive wire or strip of material may also be disposed at the periphery of the joint cement or embedded in the joint. seal cement.
- the wire or the strip of conductive material is disposed in contact with or inside the filtering portion of the filter.
- the element or elements, the coating cement and the joint cement are based on the same ceramic material, preferably based on silicon carbide SiC.
- the invention also relates to a method for detecting radial cracks on a honeycomb type particle filter using a device as previously described, in which the means for measuring the conductivity or the electrical resistance of the strip or wire of conductive material are configured for:
- the means for measuring the conductivity or the electrical resistance of the strip or the electrical wire of conductive material may further be configured to:
- the means for measuring the conductivity or electrical resistance of the strip or electrical wire of conductive material may also be configured to:
- the strip or wire of the electrically conductive material must necessarily have a lower ohmic resistance
- the strip or wire is placed between a monolithic element and the outer coating, its ohmic resistance must be substantially lower than that of the materials constituting the filter and said coating. If the strip or wire is placed in contact with the outer coating of the filter, it must have a resistance lower than that of the material constituting the coating, or even lower than the fibrous thermal insulation placed between the filter and the metal sheath.
- the properties of the strip or wire of conductive material according to the invention are chosen according to the materials constituting the equipped filter.
- the strip or the wire is made of a material whose mechanical rupture, at the temperature of use, takes place at a level of thermomechanical stress equivalent or lower at the stress level of the porous inorganic material constituting the filter.
- Such a property ultimately allows the reliable detection of ring-type cracking on the filter.
- the invention must be understood as referring to any configuration of the device as described above, since the strip or the wire has a mechanical strength less than or equal to that of the material constituting the filtering part of the filter under normal conditions. the use of the filter and preferably at a temperature between ambient and 1200 ° C.
- the level of mechanical strength of the conductive material of the strip or wire is variable and chosen depending on the material constituting the filtered.
- the conductive material used in the case of cordierite will be different from that used for recrystallized SiC, which has a much greater mechanical and thermomechanical strength.
- Other parameters such as the geometry of the filter (in particular the shape of the filter, the shape of the channels, the thickness of the filtering walls and more generally any geometric component influencing the mechanical strength of the filter) can also be taken into account in the choice.
- the material constituting the electrical conductor has a modulus of rupture on elastic modulus close to that of the material constituting the filter.
- the strip or wire of conductive material according to the invention is chosen so as not to induce additional stress on the filter and to remain attached to the monolithic element or the coating or joint cement in the normal conditions of use of the filter.
- the strip or the wire and the monolithic element or the coating cement or the joint cement are solid, if they are in sufficiently close contact so that the assembly remains bound, some the mechanical or thermomechanical stresses imposed on them, especially in the normal conditions of use of the filter and especially during the successive regeneration phases.
- the conductive material constituting the strip or the wire has a coefficient of expansion as close as possible to the porous material constituting the filtering part.
- the electrically conductive material is incorporated in the filter in the following form:
- one or more metallic or ceramic wires or ribbons in contact with and integral with the filter or coating in particular type wires of the Chromel® or Alumel® or Inconel® type or another refractory metal.
- the electrically conductive material is obtained by a deposit of percolating particles of an electrically conductive material selected from Fe, Ni, Si, Cr, W, alloys metal (including Alumel, Inconel, NiCr, FeCr, SiCr, MoSi2), or metal oxides (SnC> 2, Fe2O3 ...), or some carbides (in particular WC, B 4 C, SiC), or even the conductive carbon Electric (Graphite).
- An electrically conductive cement incorporating the particles of electrically conductive material as described above, said cement is then disposed on the filter in a strip and secured to a monolithic element of the filter, the outer coating or the joint.
- the ceramic material constituting the electrically conductive material is then based on the same material as the material constituting the portion of the filter which it is integral with, that is to say the material constituting the joint cement, the coating external or the filtering part of the filter.
- the strip or the conductive wire is preferably arranged over the entire length in the central zone of the filter or more generally in the zone where cracking preferentially occurs, since contact can be made with the measuring system .
- FIGS. 1a and 1b illustrate a first embodiment of a filter equipped according to the invention with a strip of an electrically conductive material.
- Figures 2a and 2b illustrate alternatively another embodiment in which the conductive strip is only present in the central portion of the filter.
- Figure 3 illustrates a mode in which a plurality of independently operating conductive strips are disposed at the filter surface.
- FIG. 4 illustrates a variant of the preceding mode, in which the successive bands are interconnected to form a system of resistors in parallel.
- FIG. 5 illustrates a mode in which the strip has a horseshoe or U-shaped shape, the connection electrodes to the measuring device being placed on the same face of the filter.
- FIG. 6 illustrates a variant of the preceding one, in which the strip of conductive material has a spiral shape to cover a majority of the surface of the filter.
- FIG. 7 represents a mode identical to the previous one, but in which the connection electrodes to the measuring device are placed on opposite sides of the filter.
- FIG. 8 schematizes a first configuration of a device making it possible to measure the value of the resistor Rs of the conductive strip.
- FIG. 9 schematizes a second configuration of a device making it possible to measure the value of the resistor Rs of the conductive strip.
- Figure la shows an overview of a filter 1 equipped with a conductive strip 2 according to the invention.
- the conductive strip is made of a conductive material as previously described, deposited in the form of a layer covering the outer coating of the filter.
- this representation is not, however, limiting of the present invention and the strip may be disposed at other locations of the filter, as previously described.
- the filter shown in FIG. 1a is an assembled filter obtained by assembling, by means of a joint cement 3, monolithic elements 4 made of a porous inorganic material such as SiC or cordierite or titanate. aluminum, conventionally in the form of a honeycomb structure.
- monolithic elements 4 made of a porous inorganic material such as SiC or cordierite or titanate. aluminum, conventionally in the form of a honeycomb structure.
- connectors 5 are arranged on both sides of the conductive strip 2.
- the connectors 5 are in contact with the conductive strip and connected to an apparatus for measuring the electrical conductivity or the ohmic resistance of the conductive strip. 2 (not shown in Figure 1, see Figures 8 or 9).
- the rupture of the filter at the level of the coating cement following a radial crack 6 called “ring off” also causes the rupture of the conductive strip 2 which is integral with it, and a discontinuity in the electrical measurement. This discontinuity allows according to the invention a reliable detection of cracking of the filter.
- the electrical contact between the connector 5 and the conductive strip 2 can be achieved by any known and suitable welding or soldering technique, in particular if the conductor is a ribbon or wire, or by inking or embedding the connector in the electrical conductor if it is for example a conductive cement, or by gluing by means of a ceramic glue or resistant to temperature.
- the connectors 5 advantageously have a T-shaped end 7, which makes it possible to prevent any detachment of the strip 2.
- FIGS. 2a and 2b show another embodiment in which the conductive strip 2 is only present in the central part 8 of the filter.
- the resistance conducting strip R 3 is, in the simplest way, connected to a conventional device 9 for measuring the resistance, for example by continuously measuring said resistor R 3 under an imposed voltage.
- FIG. 3 schematizes a mode close to the previous one but in which several resistors 21 to 24 are used, each connected to devices 91 to 94 for measuring the resistance. This provision additionally makes it possible to evaluate the evolution and propagation of the "ring off" crack or cracks on the filter.
- FIG. 4 shows a mode that differs from the previous one in that the strips 21 to 24 are arranged in the configuration of a multi-resistance electrical system connected in parallel, each band acting as a resistor.
- This mode therefore also makes it possible to evaluate the evolution and propagation of the "ring off" crack or fissures on the filter, at each cracking of a strip corresponding to an increase in the resistance measured by the device 9.
- FIGS. 5 to 7 various embodiments are shown, according to which the band 2 makes it possible to cover a zone that is more extensive on the surface of a filter, which allows an even earlier detection of the crack, whatever its point. appearance.
- FIG. 8 illustrates a first mode for measuring the value of the resistor Rs of the conductive strip 2. This is placed in series with a resistor R3 in a circuit supplied with voltage imposed by a generator 11, for example the vehicle battery if the system is on board. In case of rupture of the band 2, the abrupt increase of the resistance Rs allows the immediate detection of the anomaly by a voltmeter 10.
- FIG. 9 illustrates another embodiment of the device for measuring the value of the resistor Rs of the conductive strip 2.
- the conductive strip 2 is placed in series with a resistor R3 in a circuit supplied with imposed voltage. by a generator 11, for example the battery of the vehicle if the system is embedded.
- the electrical voltage across the resistor R3 is compared by means of the voltage comparator 12 to the electrical voltage across the resistor R1.
- the resistors R1 and R3 are chosen substantially equal.
- the value of the resistor R2 is chosen close to the resistance formed by the set of conductive strips 2 and connectors 5.
- the values of the resistors R1, R2 and R3 are equal and chosen so as to be very close to the resistance formed by the set of conductive strips 2 and connectors 5.
- the voltage across R3 drops and becomes very different from R1, the appearance of a crack being immediately detected by the voltage comparator 12.
- a filter structure comprising an assembly of silicon carbide filter elements bonded with a cement joint was synthesized according to the techniques described in EP 1 142 619 Al.
- a cement for the joint (and the coating) is then prepared by mixing:
- TPPNa type sodium tripolyphosphate
- a quantity of water corresponding to 10% of the weight of this mixture is added to obtain a cement of adequate viscosity.
- the structure After assembling the monoliths by means of said cement, the structure is machined on its outer surface to obtain a cylindrical structure with a diameter of about 144 mm.
- an SiC-based slip mixed with electrically conductive grains of MoSi 2 (supplied by the company Goodfellow SARL, said MoSi 2 grains being characterized by a median diameter of the order of 45 ⁇ m and a purity of 99%, 5%, with a dispersant addition of the TPPNa (sodium tripolyphosphate) type and an organic cellulose-type binder at a level of 0.5% by mass relative to the amount of MoSi 2 powder, which mixture is moistened with an addition of water about 10% compared to the amount of powder of MoSi2 present and adapted so as to obtain a viscosity suitable for a good spread of the cement and a good coverage of the support.
- TPPNa sodium tripolyphosphate
- the slip deposit is made so as to obtain a longitudinal band on the surface of the structure as shown in FIG. 2.
- Deposition in a peripheral filtration channel advantageously allows better control of the continuity of the electrically conductive film.
- An electrode of a few centimeters in length and in the form of a 0.5mm tube of inconel-type refractory metal is placed at each end of the filter in the conductive cement strip to ensure good electrical contact.
- a T-shaped shoulder is formed at the end of the electrode to prevent decohesion during the subsequent manufacturing and use steps and to allow better inking of the electrode in the conductive cement.
- the structure is dried at 110 ° C. so as to harden the conductive cement. The dried structure is then covered with the same cement as that already used for making the joints between the monolithic elements.
- the assembly is annealed at a temperature sufficient to ensure satisfactory cohesion of the filter and its elements and a hardening of the protective outer coating.
- the characteristics of the crude filtration structure thus synthesized are reported in Table 1.
- the filter is then inserted into a cladding ("canning according to the English term used in the art) with a fibrous mat thermally insulating between the filter and the metal cladding.
- Each electrode is connected by welding to an electric cable adapted to a high temperature application, particularly with an insulating thermal and electrical insulating sheath of alumina.
- Each cable passes through the cladding by means of a gland seal and is brought into contact with an ohmmeter.
- the resistance at the terminals of the filter constituted by the conductor, the electrodes and the ceramic strip constitutes the reference resistance.
- the filter is thus mounted with its instrumented sheathing with its detection device on a motor bench equipped with a means for measuring the pressure drop, so as to reproduce an exhaust line, ideally corresponding to that fitted to the vehicle which will dispose of of the filter format thus characterized.
- the filter is loaded with soot at 4 g / L of filter according to the procedure well known to those skilled in the art.
- the filter thus loaded is mounted on an exhaust line of an engine, for example of the DWlOA type of PSA 2L Diesel injection, to undergo a regeneration defined as follows: after stabilization at an engine speed of 1700 revolutions / minute for a torque of 95Nm for 2 minutes, a post-injection is performed with 70 ° phasing for a post injection rate of 18mm3 / stroke.
- soot combustion initiated more precisely when the pressure drop decreases for at least 4 seconds, the engine speed is lowered to 1050 revolutions / minute for a torque of 40 Nm for 5 minutes to accelerate the combustion of soot.
- the filter is then run at 4000 rpm for 30 minutes to remove the remaining soot.
- the measurement of the resistance is continuous and the inventors have not observed an increase in resistance outside the variation related to the evolution of the resistance of the filter as a function of temperature.
- the filter is then removed from its sheath and the inventors have not observed ring-type cracks.
- the filter is raised in its cladding under the same conditions as before and then loaded at 12 g / liter of filter and then subjected to a severe regeneration test under the same conditions as above.
- the resistance measurement is continuous and the inventors have been able to observe a sudden increase in the resistance at the filter terminals during the engine phase under steady-state conditions at 1050 rpm, that is to say at the time of the combustion of soot and heat. appearance of a radial thermal gradient of high amplitude in the filter.
- the filter is then removed from its cladding and the inventors have been able to note the presence of a "ring off" type crack, responsible for the fracture of the conductive strip.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0760202A FR2925689B1 (en) | 2007-12-21 | 2007-12-21 | DEVICE FOR DETECTING RADIAL CRACKS IN A PARTICLE FILTER |
PCT/FR2008/052391 WO2009081072A2 (en) | 2007-12-21 | 2008-12-19 | Device for detecting radial cracks in a particulate filter |
Publications (1)
Publication Number | Publication Date |
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EP2238435A2 true EP2238435A2 (en) | 2010-10-13 |
Family
ID=39638540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP08863593A Withdrawn EP2238435A2 (en) | 2007-12-21 | 2008-12-19 | Device for detecting radial cracks in a particulate filter |
Country Status (6)
Country | Link |
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US (1) | US20100308849A1 (en) |
EP (1) | EP2238435A2 (en) |
JP (1) | JP2011508130A (en) |
KR (1) | KR20100094520A (en) |
FR (1) | FR2925689B1 (en) |
WO (1) | WO2009081072A2 (en) |
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WO2011125226A1 (en) * | 2010-04-09 | 2011-10-13 | イビデン株式会社 | Honeycomb structure |
WO2011125225A1 (en) * | 2010-04-09 | 2011-10-13 | イビデン株式会社 | Honeycomb structure and exhaust gas purifier |
WO2011125228A1 (en) * | 2010-04-09 | 2011-10-13 | イビデン株式会社 | Honeycomb structure |
WO2011125229A1 (en) * | 2010-04-09 | 2011-10-13 | イビデン株式会社 | Honeycomb structure |
WO2011125227A1 (en) * | 2010-04-09 | 2011-10-13 | イビデン株式会社 | Honeycomb structure and exhaust gas purifier |
JP5791925B2 (en) * | 2010-04-09 | 2015-10-07 | イビデン株式会社 | Honeycomb structure and exhaust gas purification device |
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JP6401433B2 (en) * | 2012-09-05 | 2018-10-10 | 日本碍子株式会社 | Honeycomb structure |
JP5796559B2 (en) * | 2012-09-20 | 2015-10-21 | トヨタ自動車株式会社 | Electrode film and electrode terminal |
US9151205B2 (en) * | 2013-02-15 | 2015-10-06 | Indiana University Research & Technology Corporation | Real-time soot measurement in a diesel particulate filter |
US9739761B2 (en) * | 2014-12-11 | 2017-08-22 | Fca Us Llc | Particulate matter filter diagnostic techniques based on exhaust gas analysis |
JP6131980B2 (en) * | 2015-03-27 | 2017-05-24 | トヨタ自動車株式会社 | Electric heating type catalytic converter |
JP6879190B2 (en) * | 2017-12-19 | 2021-06-02 | 株式会社デンソー | Electric resistors, honeycomb structures, and electrically heated catalysts |
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-
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- 2008-12-19 KR KR1020107013526A patent/KR20100094520A/en not_active Application Discontinuation
- 2008-12-19 WO PCT/FR2008/052391 patent/WO2009081072A2/en active Application Filing
- 2008-12-19 JP JP2010538877A patent/JP2011508130A/en active Pending
- 2008-12-19 EP EP08863593A patent/EP2238435A2/en not_active Withdrawn
- 2008-12-19 US US12/808,949 patent/US20100308849A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
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See references of WO2009081072A2 * |
Also Published As
Publication number | Publication date |
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WO2009081072A3 (en) | 2009-08-20 |
KR20100094520A (en) | 2010-08-26 |
FR2925689A1 (en) | 2009-06-26 |
US20100308849A1 (en) | 2010-12-09 |
WO2009081072A2 (en) | 2009-07-02 |
FR2925689B1 (en) | 2010-08-13 |
JP2011508130A (en) | 2011-03-10 |
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