EP0599323B1 - Regenerierbarer Filter für die Abgase eines Verbrennungsmotors - Google Patents

Regenerierbarer Filter für die Abgase eines Verbrennungsmotors Download PDF

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Publication number
EP0599323B1
EP0599323B1 EP93119035A EP93119035A EP0599323B1 EP 0599323 B1 EP0599323 B1 EP 0599323B1 EP 93119035 A EP93119035 A EP 93119035A EP 93119035 A EP93119035 A EP 93119035A EP 0599323 B1 EP0599323 B1 EP 0599323B1
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EP
European Patent Office
Prior art keywords
wall
zone
electrodes
filter according
filter
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Expired - Lifetime
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EP93119035A
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English (en)
French (fr)
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EP0599323A1 (de
Inventor
Francesco Cuniberti
Sante Quaranta
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Iveco SpA
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Iveco Fiat SpA
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    • 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
    • F01N3/0217—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 the filtering elements having the form of hollow cylindrical bodies
    • 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
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—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 using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/14—Sintered material

Definitions

  • the present invention relates to a regenerable filter for the exhaust gas of an internal-combustion engine.
  • the invention relates to a filter which can be disposed along an exhaust pipe of an internal-combustion engine, said filter comprising a filter layer for collecting the residual products of the combustion of the gases, and electrical means which can be actuated to supply electrical energy to the filter layer, so as to initiate the regeneration of the filter itself.
  • said electrical means comprise resistive elements which are excited so as to initiate the regeneration of the filter.
  • said resistive elements are disposed upstream of the filter and, when current flows through them, they cause the temperature of the gases to rise by Joule effect, which then act on the filter surface.
  • Filters have also been proposed, in which the filter layer is formed by an electrically resistive material. This layer, which is optionally subdivided into a series of bands, is connected to electrodes so that the electric current flows completely through each band during the respective excitation. These filters have a certain degree of complexity in their construction because of the necessity cutting off of the power supply.
  • regenerable filter comprising a filter layer formed of a porous and electrical conductive material for collecting the residual products of the combustion of the exhaust gas, and a pair of electrodes energisable to cause a current to flow along an zone between the zone to induce the combustion of the residual products to initiate the regeneration of the layer.
  • regenerable filter for the exhaust gas of an internal combustion engine, which is of the utmost simplicity, has the maximum operating reliability and which obviates the above-mentioned disadvantages of known filters.
  • the regenerable filter for the exhaust gas of an internal-combustion engine which comprises a substantially cylindrical filter wall for collecting the residual products of the combustion of said gas, said wall being formed of a porous and electrically conductive material, and electrical means which can be actuated to supply electrical energy to said wall, said electrical means comprising at least two electrodes of opposite polarity connected to two corresponding parts of said wall and such that, by supplying said energy, current is caused to flow along an oblong zone of said wall located between said two electrodes, said current being of an intensity such that the temperature is raised so as to induce the combustion of said products in said zone, thus initiating the regeneration of said wall starting from said zone, according to claim 1, characterised in that said zone is located at the exhaust gas inlet side of the filter, and said electrodes are located to said wall such that said zone is formed as a substantially annular portion of said wall, or according to claim 9, characterised in that said electrodes are located along the same generatrix of said wall, whereby said regeneration propagates circumferential
  • the reference numeral 12 generally denotes a filter for the exhaust gas of an internal-combustion engine, which can be mounted in the pipe for said gas in the vicinity of the engine block.
  • the filter 12 comprises a substantially cylindrical outer casing 13 which, at one end, is connected with an inlet pipe 14 and, at the other end, is connected via a frusto-conical zone 15 with an outlet pipe 16.
  • the casing 13 is provided with an annular solid-wall flange 17 fixed thereto level with the inlet pipe 14. Additionally, the casing 13 is provided with a solid-wall disc 18 carried by a perforated annular flange 19 fixed thereto level with the frusto-conical zone 15. The two flanges 17 and 19 are provided with annular supports 21 and 22 to form a seating which can accommodate a removable filter cartridge 23.
  • the cartridge 23 substantially comprises a layer of porous filter material in the form of a substantially tubular wall 24.
  • the wall 24 ( Figures 3 and 13) may comprise a powdered and/or fibre metallic material, optionally partially sintered, so as to cement the metallic particles together only in given microzones 27.
  • the filter material may be composed of compacted steel filaments.
  • a noble catalytic material such as platinum, rhodium and the like, which can lower the temperature at which the combustion of the exhaust gas residues is initiated and, therefore, of the regeneration of the filter itself.
  • the wall 24 is substantially cylindrical, Alternatively, according to the variant of Figure 12, the wall 24 can be pleated or formed by zones 24' bent in zig-zag fashion, so as increase the transit surface thereof for the exhaust gas, thereby reducing the speed of transit inside the filter material. Optionally, it may be contained in a cylindrical casing (not shown in the drawing).
  • the material used should impart to the wall 24 a sufficient degree of permeability to the exhaust gas, electrical resistivity and thermal conductivity within predetermined values.
  • the latter can be supported partly or wholly by a mesh or metal netting 26, as will be explained more precisely below.
  • the netting 26 is disposed only on the outer surface of the wall 24 and wholly accommodates the wall 24 on its inside.
  • two coaxial nettings 26 are provided, disposed respectively on the outer surface and inner surface of the wall 24; said solution is necessary when the filter material is composed of said steel filaments to be maintained compacted.
  • Each netting 26 comprises a series of suitably interwoven metal filaments 28 and exhibits sufficient mechanical strength. Additionally, it makes it possible to graduate the electrical resistance of the wall 24, for example by varying the diameter of the filaments 28 forming the aforementioned mesh.
  • the residues progressively clog the wall 24 and thus reduce its permeability, whereby at intervals it is necessary to regenerate said wall 24 by burning these residues.
  • At least two electrodes of opposite polarity 29 and 31 are connected to two corresponding parts 32 and 33 of the wall 24.
  • the two electrodes 29 and 31 are connected through an electric circuit, which will be described in more detail below, to the poles of a battery 35 ( Figures 11 or 12), generally the battery of the motor vehicle, and/or with the onboard electrical generator.
  • a flow of current is induced in the wall 24.
  • the current density through the wall 24 is at maximum along the shortest path between the two electrodes 29 and 31 and decreases gradually as the path between said parts increases.
  • an oblong zone 36 ( Figure 9) is defined between the two electrodes 29 and 31, in which said current density is sufficiently high to cause the combustion of the exhaust gas residues to be initiated. However, outside the zone 36, the current density is not sufficient to induce this combustion to be initiated.
  • the zone 36 is substantially in the form of a strip of the wall 24, which is of a width increasing from each of the parts 32 and 33 towards the centre of the zone 36 itself, following the natural course of the lines of equal current density in the wall 24.
  • the lines of equal current density in the zone 36 are continuous, whereas the lines of equal current density outside the zone 36 are dashed.
  • the wall 24 has two straight edges 37 and 38 which are parallel to the axis of the cylinder and which are joined together by means of a bar 39 of insulating material.
  • the two edges 37 and 38 are superimposed on one another and are welded on two opposite surfaces of the bar 39 so as to form a substantially annular section of the wall 24 but which is, in fact, in the form of a convolution of a spiral.
  • the electrodes 29 and 31 are connected to the parts 32 and 33 which are disposed on two opposite surfaces of the wall 24.
  • the zone 36 is of a width increasing from the two parts 32 and 33 towards the position diametrically opposed to the parts 32 and 33.
  • the parts 32 and 33 can be disposed in adjacent positions to an annular edge 41 of the wall 24, as shown in Figure 4.
  • the edge 41 can be disposed in alignment with the inlet pipe 14 ( Figure 1) of the casing 13.
  • the zone 36 When the electric current flows through the electrodes 29 and 31, the zone 36 rapidly reaches the combustion temperature of the unburnt exhaust gas residues accumulated in the interstices of the wall 24. The combustion of the residues is then initiated in the zone 36; said combustion is propagated successively along the axis of the wall 24. Therefore, even if the flow of electric current through the electrodes 29 and 31 is interrupted, the combustion continues, thereby progressively regenerating the entire filter.
  • an insulating part 39' is provided solely to separate the two end parts 32 and 33 of the zone 36 from one another.
  • it is intended to reduce the netting, here designated 26', to supporting substantially only the zone 36.
  • a similar reduced netting can also be provided for the variant of Figure 4.
  • the edges 37 and 38 of the wall 24 are situated adjacent one another and are separated by a bar 42 of insulating material.
  • the two electrodes 29 and 31 are connected to two parts 32 and 33 disposed on the same surface of the wall 24, in alignment with the straight edges 37 and 38 and the annular edge 41.
  • the initiating zone 36 is here of perfectly annular shape and of a width decreasing towards each part 32 and 33. The initiation and propagation of regeneration are analogous to those in the embodiment of Figure 4.
  • the bar 42 can be replaced with a part 42' of insulating material, limited to the electrical separation between the two parts 32 and 33, as is the case in Figure 14.
  • it is also intended to reduce the netting 26' to supporting only the zone 36.
  • the two straight edges 37 and 38 of the wall 24 are situated adjacent one another and are directly welded together.
  • the two electrodes 29 and 31 are connected to two parts 32 and 33 disposed on the same surface of the wall 24, in two positions diametrically opposite the edge 41.
  • the initiating zone 36 is here perfectly ring-shaped and has two semi-annular symmetrical strips 36', 36". Each strip 36', 36" is of a width decreasing from the centre towards the two parts 32 and 33 of the wall 24. In this case too, the initiating and propagation of regeneration are analogous to those in the embodiment of Figure 4.
  • the two edges 37 and 38 of the wall 24 are situated adjacent one another and are directly welded together, as in the embodiment of Figure 6.
  • One of the two electrodes 29 and 31, for example the positive electrode 29, is connected to a part 43 disposed on the centre line of a generatrix of the cylinder.
  • the other electrode is replaced by two electrodes 44, both of which are supplied by the negative pole of the battery 35.
  • the two electrodes are connected to two parts 46 disposed at the two opposite ends of the same generatrix of the part 43.
  • An initiating zone 48 which has two paths 48', 48" disposed along said generator, is now formed between the electrodes 29 and 44.
  • Each path 48', 48" is of a width decreasing from the centre towards the part 43 and towards two parts 46 of the wall 24.
  • the initiation of regeneration thus takes place in the zone 48 which extends over the entire length of the wall 24.
  • the propagation of the regeneration takes place from the zone 48 proceeding in a circular direction parallel to said generatrix.
  • the supply circuit for the electrodes 29, 31 ( Figures 4-7, 14 and 15) or 29, 44 ( Figure 8) comprises, in addition to said battery 35 ( Figures 10 and 11), a switch 49 which is actuated in known manner to control the regeneration of the filter.
  • a thermistor 51 with a positive temperature coefficient is disposed in series with the switch 49, the resistivity of which thermistor increases with temperature.
  • the PTC 51 is disposed in the vicinity of the wall 24 so as to assume substantially the temperature of the latter.
  • the switch 49 When the switch 49 is closed, if the wall 24 is cold, as is the case when the engine is being started, the resistivity of the PTC 51 is low and, therefore, a high electric current flows through the zone 36 or 48 so that, in any case, any residues of the gases are caused to undergo combustion in said zone 36 or 48, thus initiating the regeneration of the-filter cartridge 23.
  • the resistivity of the PTC 51 increases and, therefore, a lower electric current flows through the zone 36 or 48, which is sufficient to initiate the regeneration of the filter cartridge 23. In this way the consumption of electrical energy for this initiating procedure is always reduced to the minimum required.
  • a second switch 52 which is controlled by a control circuit 53 of the type known as a "chopper".
  • the duty cycle of the chopper circuit 53 is reduced as the temperature detected by a temperature sensor 54 increases.
  • the latter essentially comprises a thermocouple (TC) which can detect the temperature of the wall 24, whereby the chopper circuit 53 is feedback controlled by the thermocouple 54.
  • TC thermocouple
  • thermocouple 54 controls the chopper circuit 53 in such a way as to actuate the switch 52, thus causing the electric current to flow through the zone 38 or 48 for a relatively long time.
  • the signal generated by the thermocouple 54 itself induces a reduction in the duty cycle of the output signal generated by the chopper circuit 53, whereby the electric current flows through the zone 36 or 48 of the wall 24 for a time which on average is less than that previously indicated. In this way, the consumption of electrical energy for initiating the regeneration is always reduced to a minimum.
  • the advantages of the filters of the invention with respect to the known filters are obvious from the foregoing. Firstly, there is a reduction in the zone 36 or 48 to be excited by means of the power supplied by the battery 35 of the motor vehicle, thus increasing its life. In addition, a gradual regeneration is obtained, thus avoiding overheating of the wall 24 of the filter cartridge 23. Finally, the initiating cycle can be controlled periodically in an automatic manner.
  • porous metallic material which is electroconductive and has controlled thermal conduction makes possible:
  • the parts 32 and 33 of the wall 24, in the embodiments of Figures 4-7, 14 and 15, can be arranged in such a way that the zone 36 is in alignment with the centre line of the wall 24.
  • the propagation of regeneration takes place by advancing in two opposite directions, parallel to the axis of the cylinder of the wall 24.
  • a single electrode 44 can be provided which is connected to a part 46, whereas the electrode 29 can be connected to the other part 46 disposed at the end of the same generator of the cylinder of the wall 24.
  • the arrangement of the electrodes in Figures 4-8, 14 and 15 may also be applied to the wall 24 in accordance with the variant of Figure 12.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)

Claims (17)

  1. Regenerierbarer Filter für die Abgase eines Verbrennungsmotors, versehen mit einer im wesentlichen zylindrischen Filterwand (24) zum Sammeln der Verbrennungsrückstände des Gases, wobei die Wand (24) aus einem porösen und elektrisch leitendem Material gebildet ist und mit zumindest elektrischen Mittel (35, 29, 31), das zum Zuführen elektrischer Energie zu der Wand (24) betätigt werden kann, wobei das elektrische Mittel (35, 29, 31) zumindest zwei Elektroden (29, 31) entgegengesetzter Polarität umfasst, die mit zwei jeweiligen Teilen (32, 33) der Wand (24) verbunden sind, und daß derart, durch Zuführen der Energie, Strom entlang einer Rechteckzone (36) der Wand (24), die zwischen den zwei Elektroden ( 29, 31) plaziert ist, zum Fließen gebracht wird, wobei der Strom eine derartige Intensität aufweist, daß die Temperatur so angehoben wird, daß die Verbrennung der Rückstände in der Zone (36) bewirkt wird, was die Regeneration der Wand (24) beginnend von der Zone (36) startet,
    dadurch gekennzeichnet, daß
    die Zone (36) an der Abgaseinlaßseite des Filters plaziert ist und die Elektroden (29, 31) an der Wand (24) derart plaziert sind, daß die Zone (36) als ein im wesentlichen ringförmiger Abschnitt der Wand (24) gebildet ist.
  2. Filter nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Wand (24) aus einem diametrisch gefalteten Abschnitt besteht, insbesondere aus einer Reihe von Zickzackabschnitten (24') gebildet ist.
  3. Filter nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, daß
    zwei Endteile (32, 33) der ringförmigen Zone (36) durch ein Teil (39', 42') aus isolierendem Material getrennt sind, wobei die Elektroden (29, 31) mit den zwei Endteilen (32, 33) verbunden sind, wodurch sich die Zone (36) entlang des gesamten Umfangs des ringförmigen Abschnitts entwickelt.
  4. Filter nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, daß
    die Wand zwei gerade Kanten (36, 37) aufweist, die durch einen Streifen (39, 42) aus isolierendem Material verbunden sind, wobei die Elektroden (29, 31) mit den zwei Teilen (32, 33) der Kanten (37, 38) verbunden sind, wodurch sich die Zone (36) entlang des gesamten Umfangs des ringförmigen Teils entwickelt.
  5. Filter nach Anspruch 3 oder 4,
    dadurch gekennzeichnet, daß
    das Teil (39') oder der Streifen (39) aus isolierendem Material zwischen zwei gegenüberliegenden Flächen der Kanten (37, 38), die übereinander gelegt sind, um so einen Spiralabschnitt für die Wand (24) zu bilden, angeordnet ist.
  6. Filter nach Anspruch 3 oder 4,
    dadurch gekennzeichnet, daß
    das Teil (42') oder der Streifen (42) aus isolierendem Material zwischen den Kanten (37, 38) der Wand (24) angeordnet ist und daß die Elektroden (29, 31) auf der selben Fläche der Wand (24) angeschlossen sind.
  7. Filter nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Elektroden (29,31) mit zwei diametral gegenüberliegenden Teilen (32, 33) des ringförmigen Teils verbunden sind, wodurch sich die Zone (36) entlang zwei Halbumfängen (36', 36") des ringförmigen Teils entwickelt.
  8. Filter nach irgendeinem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Zone (36) auf einer ringförmigen Kante (41) der Wand (24) benachbart dem Einlaßrohr (14) angeordnet ist.
  9. Regenerierbarer Filter für die Abgase eines Verbrennungsmotors, versehen mit einer im wesentlichen zylindrischen Filterwand (24) zum Sammeln der Verbrennungsrückstände des Gases, wobei die Wand (24) aus einem porösen und elektrisch leitendem Material gebildet ist und mit zumindest einem elektrischen Mittel (35, 29, 44), das zum Zuführen elektrischer Energie zu der Wand (24) betätigt werden kann, wobei das elektrische Mittel (35, 29, 44) zumindest zwei Elektroden (29, 44) entgegengesetzter Polarität umfasst, die mit zwei jeweiligen Teilen (43, 46) der Wand (24) verbunden sind, und daß derart, durch Zuführen der Energie, Strom entlang einer Rechteckzone (48) der Wand (24), die zwischen den zwei Elektroden ( 29, 44) plaziert ist, zum Fließen gebracht wird, wobei der Strom eine derartige Intensität aufweist, daß die Temperatur so angehoben wird, daß die Verbrennung der Rückstände in der Zone (48) bewirkt wird, was die Regeneration der Wand (24) beginnend von der Zone (48) startet,
    dadurch gekennzeichnet, daß
    die Elektroden (29, 44) entlang derselben Erzeugenden der Wand (24) angeordnet sind, wodurch sich die Regeneration auf der Wand (24) umfangsmäßig ausbreitet, wobei eine Elektrode (29) einer vorbestimmten Polarität auf einem Mittelteil (43) der Erzeugenden plaziert ist und zwei Elektroden (44) mit entgegengesetzter Polarität auf zwei Endteilen (46) der Erzeugenden plaziert sind, wobei die Zone (48) durch zwei Segmente (48', 48") ausgebildet sind, die in gegenüberliegenden Richtungen sich entlang der Erzeugenden entwickeln.
  10. Filter nach irgendeinem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Filterschicht (24) aus einem pulverisierten oder faserigen metallischen Material sich zusammensetzt, das in solch einer Weise verdichtet ist, um einen Aufbau zu bilden, der gasdurchlässig und elektrisch leitfähig ist.
  11. Filter nach Anspruch 10,
    dadurch gekennzeichnet, daß
    das Material teilweise gesintert ist, um so eine schwammförmige Struktur zu bilden, die eine Reihe von Mikrozonen (27) besitzt, die die Partikel des Materials miteinander verbinden.
  12. Filter nach Anspruch 10,
    dadurch gekennzeichnet, daß
    das Material aus Stahlfasern gebildet ist.
  13. Filter nach irgendeinem der Ansprüche 10 bis 12,
    dadurch gekennzeichnet, daß
    das Material an zumindest der Höhe der Zone (36, 48) durch ein Metallgeflecht (26, 26') gestützt ist, das den elektrischen Widerstand und die mechanische Festigkeit der Zone (24) abstufen kann.
  14. Filter nach Anspruch 13,
    dadurch gekennzeichnet, daß
    das Metallgeflecht (26) die Außenfläche der Wand (24) insgesamt überdeckt.
  15. Filter nach Anspruch 13,
    dadurch gekennzeichnet, daß
    die Innenfläche und die Außenfläche der Wand (24) durch zwei koaxiale Metallgeflechte (26) gestützt werden.
  16. Filter nach irgendeinem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Elektroden (29,31; 29,44) unter der Steuerung eines intermittierenden Steuerungselements (51, 54), das auf den Druck des Abgases und/oder der Temperatur der Wand (24) sensitiv ist, betätigt werden, wobei das Steuerungselement einen Thermistor (51) mit einem positiven Temperaturkoeffizienten umfaßt, der die Temperatur messen kann und in Reihe mit den Elektroden (29, 31; 29, 44) angeordnet ist.
  17. Filter nach irgendeinem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Elektroden (29, 31; 29, 44) unter der Kontrolle eines intermittierenden Steuerungselements (54), das auf den Druck des Abgases und/oder auf die Temperatur der Wand (24) sensitiv ist, betätigt werden, wobei das Steuerungselement ein Thermoelement (54) umfaßt, das die Temperatur messen kann, um einen Zerhackerkreis (53) zum Steuern der Regeneration rückgekoppelt zu steuern.
EP93119035A 1992-11-26 1993-11-25 Regenerierbarer Filter für die Abgase eines Verbrennungsmotors Expired - Lifetime EP0599323B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO920956A IT1261725B (it) 1992-11-26 1992-11-26 Filtro rigenerabile per i gas di scarico di un motore a combustione interna.
ITTO920956 1992-11-26

Publications (2)

Publication Number Publication Date
EP0599323A1 EP0599323A1 (de) 1994-06-01
EP0599323B1 true EP0599323B1 (de) 1997-02-12

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EP93119035A Expired - Lifetime EP0599323B1 (de) 1992-11-26 1993-11-25 Regenerierbarer Filter für die Abgase eines Verbrennungsmotors

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EP (1) EP0599323B1 (de)
DE (1) DE69308107T2 (de)
ES (1) ES2097963T3 (de)
IT (1) IT1261725B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
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EP1225316A2 (de) * 2001-01-19 2002-07-24 Walter Hofmann Vorrichtung im Abgassystem eines Verbrennungsmotors zur Prüfung der Belastung des Abgasstroms mit Russpartikeln

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ITTO920956A0 (it) 1992-11-26
ES2097963T3 (es) 1997-04-16
DE69308107D1 (de) 1997-03-27
DE69308107T2 (de) 1997-06-26
ITTO920956A1 (it) 1994-05-27
EP0599323A1 (de) 1994-06-01
IT1261725B (it) 1996-05-30

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