EP1581727B1 - Unterstützungssystem zur regeneration einesteilchenfilters in einer auslassleitung eines dieselmotors - Google Patents

Unterstützungssystem zur regeneration einesteilchenfilters in einer auslassleitung eines dieselmotors Download PDF

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Publication number
EP1581727B1
EP1581727B1 EP04700266A EP04700266A EP1581727B1 EP 1581727 B1 EP1581727 B1 EP 1581727B1 EP 04700266 A EP04700266 A EP 04700266A EP 04700266 A EP04700266 A EP 04700266A EP 1581727 B1 EP1581727 B1 EP 1581727B1
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EP
European Patent Office
Prior art keywords
particle filter
engine
fap
impregnation
fuel
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Expired - Lifetime
Application number
EP04700266A
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English (en)
French (fr)
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EP1581727A1 (de
Inventor
Christine Rigaudeau
Yvan Agliany
Marion Wermester
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Priority claimed from FR0300109A external-priority patent/FR2849671B1/fr
Priority claimed from FR0300112A external-priority patent/FR2849670B1/fr
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1581727A1 publication Critical patent/EP1581727A1/de
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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
    • F01N3/033—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 in combination with other devices
    • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • 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
    • 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
    • F01N3/025—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 fuel burner or by adding fuel to exhaust
    • F01N3/0253—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 fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/04—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by adding non-fuel substances to combustion air or fuel, e.g. additives
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/08—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
    • F01N2430/085—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing at least a part of the injection taking place during expansion or exhaust stroke
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust

Definitions

  • the invention relates to the automotive industry and, more particularly, the depollution of internal combustion engines, in particular diesel engines.
  • Diesel motor vehicles of recent design are equipped on their exhaust systems, different devices for the treatment of pollutants produced by the combustion of fuel in the engine.
  • a first of these devices ensures the oxidation of the exhaust gas through the passage of these gases on an oxidation catalyst.
  • a second of these devices is a particulate filter (FAP) on which the particles (soot) produced by the combustion are deposited.
  • FAP particulate filter
  • these soot must be burned, especially with the help of an increase in the temperature of the FAP or the exhaust gases, to prevent the filter from clogging and make it regain its original performance (operation called "Regeneration").
  • an additive such as ceria and / or iron oxide that mixes with soot and lowers their combustion temperature.
  • a cleaning of the FAP is necessary to remove the additive and unburnt residues.
  • the object of the invention is to give the possibility to the manufacturer to reduce the size of the exhaust lines of diesel engines of motor vehicles and / or reduce the periodicity of thorough cleaning of the FAP necessary for the proper operation of the line of exhaust.
  • the subject of the invention is a motor vehicle comprising a diesel engine equipped with an exhaust line in which is integrated a particulate filter, air intake means in the engine, recycling means engine exhaust gas at its inlet, a turbocharger, a common fuel supply system for the engine cylinders, comprising electrically driven injectors, associated with these cylinders, means for adding an additive to the fuel intended to be deposited on the particulate filter, to lower the combustion temperature particles trapped therein, means for acquiring information relating to different operating parameters of the engine and associated members thereof, and means for controlling the operation of the admission means, recycling means , the turbocharger and / or the supply system for controlling the operation of the engine, these means being further adapted to trigger a regeneration phase of the particulate filter by combustion of the particles trapped therein by engaging an injection phase multiple fuel in the cylinders of the engine during their expansion phase, the particulate filter being impregnated with a catalyst for oxidation of hydrocarbons and CO present in the exhaust gas flowing through said particulate filter, and
  • the zone of highest impregnation is located in the center of the cross section of the particle filter, over part of its length from the inlet face of the particulate filter, the surface of said zone of more high impregnation representing 20 to 70% of the cross section of said particulate filter and this zone of stronger impregnation being present on 10 to 60% of the length of the particulate filter from its inlet face, the end portion of the filter with particles being free from impregnation by the oxidation catalyst.
  • Said metal may be a Group VIII metal such as platinum, palladium or rhodium, or a mixture of such metals.
  • the essential feature of the invention is the carrying out of the oxidation of the exhaust gas and the filtration of the particles within the same reactor. This is achieved by impregnating the material constituting the FAP with an oxidation catalyst such as a metal, for example platinum.
  • This diesel engine is associated with input air intake means thereof, which are designated by the general reference 2.
  • this engine is associated with an exhaust line which is designated by the general reference 3.
  • Means for recycling engine exhaust gas at the inlet thereof are also provided and are designated by the general reference 4.
  • the exhaust line may also be associated with a turbocharger designated by the general reference 5 and more particularly to the turbine portion thereof, in a conventional manner.
  • the exhaust line comprises, according to the invention, a housing 6 enclosing a particulate filter designated by the general reference 7, the particulate filter being impregnated with an oxidation catalyst.
  • the "oxidation” and “filtration” functions are therefore performed in the same medium, unlike the prior art where the gases successively pass through an oxidation medium and a filtration medium each dedicated to one of these functions and not to the other.
  • the engine is also associated with a common fuel system of the cylinders.
  • This system is designated by the general reference 8 in this figure and comprises, for example, electrically operated injectors associated with these cylinders.
  • the engine is a four-cylinder engine and therefore comprises four electrically operated injectors, respectively 9, 10, 11 and 12.
  • injectors are associated with a common fuel feed ramp designated by the general reference 13 and connected to fuel supply means designated by the general reference 14, comprising for example a high pressure pump.
  • These supply means are connected to a fuel tank designated by the general reference 15 and means for adding to this fuel an additive intended to be deposited on the particle filter to lower the combustion temperature of the trapped particles. In this one.
  • this additive may, for example, be contained in an auxiliary tank designated by the general reference 16 associated with the fuel tank 15 to allow the injection of a certain amount of this additive into the fuel.
  • this motor and the various components that have just been described are also associated with means for controlling their operation designated by the general reference 17 in this figure, comprising, for example, any appropriate calculator 18 associated with storage means.
  • information 19 and input to different means for acquiring information relating to different operating parameters of the engine and these bodies, the computer being then adapted to control the operation of the admission means, recycling means, turbocharger and / or the power system, so as to control the operation of the engine and in particular the torque generated by it according to the driving conditions of the vehicle in a conventional manner.
  • this calculator is connected to a differential pressure sensor 20 at the terminals of the particulate filter 7 and to temperature sensors 21, 22 respectively upstream of the particulate filter and downstream of this particulate filter. in the exhaust line.
  • the computer may also receive oxygen content information of the exhaust gas from a Lambda ⁇ probe designated by the general reference 23 in this figure, integrated into the exhaust line.
  • this computer is adapted to control the air intake means, the exhaust gas recycling means, the turbocharger, the means for adding fuel to the additive, the fuel supply means of the common rail and the various injectors associated with the engine cylinders.
  • this computer is adapted to trigger a regeneration phase of the particulate filter by combustion of the particles trapped therein by engaging a phase of multiple injections of fuel in the cylinders of the engine during their expansion phase.
  • the particles emitted by the engine during its operation are indeed trapped in the particulate filter. It is then necessary to regenerate it regularly by combustion of these particles.
  • the engine In conventional systems where the oxidation and filtration functions are separated, the engine, during its normal operating phases, emits exhaust gases containing mainly hydrocarbons, CO, CO 2 , water vapor , NO x , oxygen and particles at a temperature of 180-200 ° C. Passage into the reactor containing the oxidation catalyst (generally a metal such as platinum) converts about 90% or more of CO, hydrocarbons with oxygen to CO 2 and water vapor.
  • the combustible fraction of the soot (so-called "soluble organic fraction", abbreviated to SOF), in the form of condensed hydrocarbons on the particles, is also treated by the oxidation catalyst.
  • the exhaust gas therefore contains only significantly more residual oxygen, CO 2 , water vapor (these two compounds in greater quantities than at the inlet of the catalyst). oxidation), NO x and particles. These discharges then enter the FAP, where they are purified of the particles which are deposited on the walls of the filter. Releases to the atmosphere then significantly contain only oxygen, CO 2 , water vapor and NO x .
  • NO x treatment device such as a NO x trap, and thus not be released to the atmosphere.
  • the reactor containing the oxidation catalyst is removed as such. Its function is transferred to the particle filter 7 which consists of a material traditionally used for this purpose (Such as a ceramic, for example silicon carbide), but which is impregnated with an oxidation catalyst such as platinum and / or palladium.
  • This catalyst is carried by a "washcoat" of oxide (Al 2 O 3 for example), which can also contain compounds having a function OSC (storage of oxygen): for example materials of the cerium oxide group and / or mixed oxide of cerium and zirconium. This impregnation may concern only the surface of the pores, or the entire material.
  • this material can be adapted, from the point of view of its porosity and the distribution of the pore diameter, so that the catalyzed oxidation reaction occurs there with optimal efficiency, comparable to that which is observed in the conventional separate oxidation reactors, without producing too much back pressure which would hinder the flow of gases.
  • the pore size is centered on about 9 ⁇ m in a conventional particle filter. In an impregnated particle filter according to the invention, this pore size can be centered on sizes of 11 ⁇ m up to 20-30 ⁇ m. These values are given only as examples.
  • an exhaust line comprising a modified FAP 7 according to the invention is compared with an exhaust line comprising a conventional FAP located immediately downstream of an oxidation catalyst, it can be said that at the inlet modified FAP 7 according to the invention, there are emissions of gases and particles identical to those which usually enter the oxidation reactor. At the outlet of the FAP 7 modified according to the invention, there are gas emissions identical to those coming out of the FAP of the prior art.
  • a notable advantage of the invention is that SOF soot is not treated before the soot passes on the FAP 7. It is thus available to make soot combustion easier during regeneration phases thanks to the heat released locally by burning SOF.
  • the FAP 7 undergoes a regeneration phase, during which soot which partially clog it is burned.
  • the timing of this regeneration can be chosen in different ways. Regeneration can be systematically decided after the vehicle has traveled a given distance since the last regeneration date. It can also be triggered when the differential pressure sensor 20 finds a significant pressure differential between the incoming gases and the outgoing gases, sign of a start of clogging of the FAP 7. The trigger can also be decided by an estimate of the amounts of accumulated soot in FAP 7 after consulting a map based on the type of taxiing performed.
  • a regeneration aid additive such as ceria
  • ceria can be added to the fuel which lowers the soot combustion temperature to about 450 ° C and provides available oxygen for this combustion.
  • an additional injection of fuel upstream of the FAP 7 for example by switching on a multiple injections phase in the cylinders of the engine 1 during the expansion phase. This additional injection is intended to increase the temperature of the exhaust gas and their hydrocarbon and CO contents, compared to the normal operating phases of the engine 1.
  • the additional injection is carried out before the oxidation reactor. It partially converts CO and additional hydrocarbons with oxygen consumption, increasing the temperature of the gases up to 450 ° C and more, thus allowing soot combustion in the FAP to be burned.
  • the regeneration aid additive assists the propagation of combustion within soot.
  • this exothermic reaction being more effective, it can reduce the amount of additive. At equal filtration volume, slower fouling is therefore observed by unburned residues.
  • the figure 2 schematically represents in cross-section an example of FAP 7 of circular section divided into several modules 24. These modules 24 are impregnated with catalyst homogeneously on their section and on their length.
  • the impregnation of the FAP 7 by the oxidation catalyst is not carried out homogeneously.
  • the amount of catalyst is distributed favorably in FAP 7 zones the most favored thermally and where the gas flows are the most important, to increase the conversion of CO and hydrocarbons, and to prevent catalytic aging of the filter in the most heat-stressed areas.
  • the distribution of the catalyst may be inhomogeneous in the radial direction of FAP 7 and / or in the axial direction of FAP 7.
  • the trajectory of the gas flows from the combustion chamber leads to a flow gradient inside the FAP 7.
  • the importance of this gradient depends on the operating conditions of the FAP 7. and the shape of the connecting cone between the main exhaust line and the FAP 7.
  • the phenomenon results in higher gas velocities in the center of the FAP 7 while the gas flows are significantly reduced when one moves radially towards the periphery of the FAP 7.
  • This phenomenon also has another consequence, namely that the temperatures in the center of the FAP 7 are higher than those at the periphery of the FAP 7.
  • This phenomenon is accentuated by some particulate filters with high conductivity (those based on SiC for example) relative to a conventional catalyst.
  • the temperature has a tendency to evacuate strongly towards the periphery and the length of the FAP 7.
  • the figure 3 shows a FAP 7 seen in cross section.
  • the side modules 25 are impregnated with a smaller amount of catalyst than the more central modules 26.
  • the distribution of the catalyst is substantially homogeneous within each module. This may not always be the case, for example as represented on the figure 4 , where portions of the lateral modules 25 are also included in the zone of highest impregnation, so as to give the zone of greater impregnation a substantially circular cross section.
  • the zone of highest impregnation represents from 20 to 70% of the surface area of the cross section of the FAP 7.
  • the amount of catalyst is typically of the order of 1.5 to 5 times that present in the areas of lower impregnation.
  • the zone of higher impregnation 27, besides not covering the entire cross section of FAP 7, is only present for part of the length of the FAP 7, typically 10 to 50%, or even 60% of this length from the inlet face 28 of the FAP 7.
  • the impregnation is carried out with a smaller and homogeneous amount of catalyst to form a zone 29 of lower impregnation.
  • the zone of lower impregnation 29 stops before the exit face 30 of the FAP 7, for example, as shown, at the end of the zone of stronger impregnation 27.
  • the catalyst has a lower efficiency than in the area closer to the inlet of the FAP 7. It is therefore less useful to carry out an impregnation in this end portion 31, and completely eliminate it allows to save material, as well as to limit the pressure losses of the combustion gases.
  • this absence of catalyst in the end portion 31 of the FAP 7 is also applicable in the case where the impregnation of FAP 7 by the catalyst is identical in all the areas where this impregnation exists.
  • One way is to keep the entire oxidation catalyst-FAP its usual volume. In doing so, the volume available for the deposition of the soot is increased since it can now be carried out in the whole of the assembly and not only in its part FAP. This makes it possible to delay the clogging of the FAP and to have to perform its regenerations and thorough cleanings only at a reduced frequency compared to to the prior art (the thorough cleaning may take place, for example, that every 160 000km or more, depending on the vehicles concerned, instead of every 80000km or 120 000km).
  • a second way is to reduce the size of the oxidation catalyst-FAP assembly, to a size providing a sufficient volume for soot deposition sufficient to impose a thorough cleaning frequency of the FAP comparable to that practiced with the exhaust lines of the prior art, in which the oxidation catalyst is distinct from the FAP.
  • the advantage of the invention lies in the smaller size of the assembly.
  • the invention finds a preferred application to the exhaust lines of diesel engines, but it can be applied to the exhaust line of any type of internal combustion engine for which it would be necessary to use a particulate filter.

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

Claims (3)

  1. Kraftfahrzeug, das einen Dieselmotor aufweist, der mit einer Auspufflinie versehen ist, in die ein Partikelfilter, Mittel (2) zum Einlassen von Luft in den Motor, Mittel (4) zum Recyceln der Abgase des Motors an dessen Einlass, ein Turbolader, ein System (8) zum gemeinsamen Versorgen mit Kraftstoff der Zylinder des Motors, das Injektoren mit elektrischer Steuerung (9, 10, 11, 12) aufweist, die mit diesen Zylindern verbunden sind, Mittel (16) zum Hinzufügen eines Zusatzstoffes zum Kraftstoff, der dazu bestimmt ist, sich auf dem Partikelfilter (7) abzulagern, um die Verbrennungstemperatur der Partikel, die in diesem gefangen sind, zu senken, Mittel (20, 21, 22) zum Erfassen von Informationen in Zusammenhang mit verschiedenen Betriebsparametern des Motors und der zu diesem gehörenden Organe, sowie Mittel (17) zum Kontrollieren des Funktionierens der Einlassmittel, der Recyclingmittel, des Turboladers und/oder des Versorgungssystems aufweist, um das Funktionieren des Motors zu prüfen, wobei diese Mittel ferner eine Regenerierungsphase des Partikelfilters (7) durch Verbrennen der Partikel, die in diesem gefangen sind, auslösen können, indem eine Phase von mehreren Kraftstoffinjektionen in die Zylinder des Motors während ihrer Wartephase ausgelöst wird, wobei das Partikelfilter (7) durch einen Katalysator zur Oxidation der Kohlenwasserstoffe und des CO, die in den Abgasen, die durch das Partikelfilter zirkulieren, gegenwärtig sind, imprägniert wird, und mit einem Bereich mit stärkerem Imprägnieren (27) durch den Oxidationskatalysator, dadurch gekennzeichnet, dass der Bereich mit stärkerem Imprägnieren in der Mitte des Querschnitts des Partikelfilters (7) auf einem Teil seiner Länge ausgehend von der Eingangsfläche des Partikelfilters (7) liegt, wobei die Fläche des Bereichs mit stärkerem Imprägnieren (27) 20 bis 70 % des Querschnitts des Partikelfilters (7) darstellt, und wobei dieser Bereich mit stärkerem Imprägnieren auf 10 bis 60 % der Länge des Partikelfilters (7) ausgehend von seiner Einlassseite (28) gegenwärtig ist, wobei der Endteil (31) des Partikelfilters (7) keine Imprägnierung durch den Oxidationskatalysator hat.
  2. System nach Anspruch 1, dadurch gekennzeichnet, dass der Katalysator ein Metall oder ein Gemisch von Metallen ist.
  3. System nach Anspruch 2, dadurch gekennzeichnet, dass das Metall ein Metall der Gruppe Viii ist, wie zum Beispiel Platin, Palladium oder Rhodium, oder ein Gemisch derartiger Metalle.
EP04700266A 2003-01-07 2004-01-06 Unterstützungssystem zur regeneration einesteilchenfilters in einer auslassleitung eines dieselmotors Expired - Lifetime EP1581727B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR0300109A FR2849671B1 (fr) 2003-01-07 2003-01-07 Filtre a particules pour ligne d'echappement et ligne d'echappement, systeme d'aide a la regeneration et procede de traitement des gaz d'echappement l'utilisant
FR0300112A FR2849670B1 (fr) 2003-01-07 2003-01-07 Filtre a particules pour ligne d'echappement d'un moteur a combustion interne et ligne d'echappement le comprenant
FR0300109 2003-01-07
FR0300112 2003-01-07
PCT/FR2004/000007 WO2004070177A1 (fr) 2003-01-07 2004-01-06 Systeme d'aide a la regeneration d'un filtre a particules d'une ligne d'echappement d'un moteur diesel

Publications (2)

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EP1581727A1 EP1581727A1 (de) 2005-10-05
EP1581727B1 true EP1581727B1 (de) 2010-11-10

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EP04700266A Expired - Lifetime EP1581727B1 (de) 2003-01-07 2004-01-06 Unterstützungssystem zur regeneration einesteilchenfilters in einer auslassleitung eines dieselmotors

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US (1) US7552585B2 (de)
EP (1) EP1581727B1 (de)
AT (1) ATE487858T1 (de)
DE (1) DE602004029979D1 (de)
WO (1) WO2004070177A1 (de)

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FR2913431B1 (fr) 2007-03-06 2009-04-24 Rhodia Recherches & Tech Procede de fonctionnement d'un moteur diesel en vue de faciliter la regeneration d'un filtre a particules sur la ligne d'echappement
GB0705920D0 (en) * 2007-03-28 2007-05-09 Infineum Int Ltd Method of supplying iron to the particulate trap of a diesel engine exhaust
WO2008143851A1 (en) * 2007-05-18 2008-11-27 Tribute Creations, Llc Reactor with differentially distributed catalytic activity
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GB0811144D0 (en) * 2008-06-18 2008-07-23 Parker Hannifin U K Ltd A liquid drain system
FR2943728B1 (fr) * 2009-03-24 2014-07-11 Peugeot Citroen Automobiles Sa Procede de controle des emissions polluantes d'un moteur a combustion, groupe motopropulseur et vehicule equipe de ce groupe motopropulseur
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Publication number Publication date
US20060144039A1 (en) 2006-07-06
EP1581727A1 (de) 2005-10-05
ATE487858T1 (de) 2010-11-15
US7552585B2 (en) 2009-06-30
WO2004070177A1 (fr) 2004-08-19
DE602004029979D1 (de) 2010-12-23

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