EP1759109A1 - System for assisting regeneration of pollution management means for motor vehicle engine - Google Patents

System for assisting regeneration of pollution management means for motor vehicle engine

Info

Publication number
EP1759109A1
EP1759109A1 EP05778239A EP05778239A EP1759109A1 EP 1759109 A1 EP1759109 A1 EP 1759109A1 EP 05778239 A EP05778239 A EP 05778239A EP 05778239 A EP05778239 A EP 05778239A EP 1759109 A1 EP1759109 A1 EP 1759109A1
Authority
EP
European Patent Office
Prior art keywords
regeneration
level
strategies
engine
strategy
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Withdrawn
Application number
EP05778239A
Other languages
German (de)
French (fr)
Inventor
Christophe Colignon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1759109A1 publication Critical patent/EP1759109A1/en
Withdrawn legal-status Critical Current

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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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
    • F01N3/033—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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/01—Adding substances to exhaust gases the substance being catalytic material in liquid form
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0812—Particle filter loading
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a system for assisting the regeneration of depollution means integrated in an exhaust line of a motor vehicle diesel engine.
  • the invention relates to such a system in which the engine is associated with common cylinder fuel supply means thereof, according to at least one post-injection.
  • Such a post-injection is, in a conventional manner, an injection of carbu ⁇ rant after top dead center of the cylinder considered.
  • These power supply means are adapted to implement, at iso ⁇ torque, by modifying engine operating control parameters, different regeneration strategies to obtain different thermal levels in the exhaust line.
  • feed means implementing a first regeneration strategy according to a so-called level 1 strategy and a second regeneration strategy according to a so-called level 2 strategy and / or an overcalibrated level 2 strategy have already been implemented. proposed.
  • This combustion can be assisted by a catalyst element melan ⁇ with soot, resulting for example from a regeneration aid additive, mixed with the engine feed fuel or by a catalyst deposited directly on the walls of the filter to particles (catalyzed particle filter).
  • the subject of the invention is a system for assisting the regeneration of depollution means integrated in an exhaust line of a motor vehicle diesel engine, in which the engine is associated with feed means. with common rail fuel injection into the cylinders thereof, according to at least one post-injection and adapted to implement, isocouple, by changing control parameters of the engine operation, at least two strategies of regeneration including a first regeneration strategy comprising so-called level 1 and level 2 strategies, and a second regeneration strategy comprising level 1 strategies and an alternating sequence of supercalibrated level 2 and level 2 strategies, allowing to obtain different thermal levels in the exhaust line, characterized in that it comprises means for analyzing the state of charge of the depollution means and means for comparing it with predetermined threshold values, for implementing the first regeneration strategy for the states of charge lower than the threshold values or the second strategy for the higher states of charge. threshold values. According to other characteristics:
  • the depollution means comprise a particulate filter; the particulate filter is catalyzed;
  • the depollution means comprise a NOx trap
  • the fuel comprises an additive intended to be deposited with the particles to which it is mixed, on the means of depollution to facilitate their regeneration;
  • the fuel comprises an additive forming a NOx trap
  • the depollution means are impregnated with an SCR formulation, ensuring a CO / HC oxidation function
  • the engine is associated with a turbocharger; the charge states of the depollution means are determined from the pressure drop across the depollution means;
  • FIG. 1 represents a block diagram illustrating the structure of a help system according to the invention.
  • - Fig.2 illustrates the operation thereof.
  • FIG. 1 has in fact illustrated a system for assisting the regeneration of depollution means designated by the general reference 1, associated with means forming an oxidation catalyst, designated by the general reference 2 and placed in an exhaust line 3 of a heat engine such as a diesel engine of a motor vehicle.
  • a heat engine such as a diesel engine of a motor vehicle.
  • This engine is designated by the general reference 4 and may be associated for example with a turbocharger whose turbine portion 5 is associated with the exhaust line and the compressor portion 6 is placed upstream of the engine.
  • the engine is associated with common rail fuel supply means of the cylinders thereof, designated by the general reference 7, the operation of which is controlled by a supervisor 8.
  • this system also comprises means for analyzing the state of charge of the depollution means and means for comparing it with predetermined threshold values, in order to control the functioning of the engine. .
  • the analysis means formed for example by the supervisor 8, are then connected to means for determining these states of charge, designated by the general reference 9, delivering them to the supervisor 8, so as to allow the these are compared with threshold values as delivered by generation means 10, including any appropriate means for establishing these threshold values.
  • the determination of the state of charge of the depollution means is indeed important. This determination makes it possible to determine, for example, whether the depollution means are overloaded with soot or clogged.
  • the state of charge of the depollution means is determined in order to adapt the regeneration strategy.
  • this state of charge can be determined from the pressure drop measured at the terminals of the pollution control means and in particular of the particle filter, in a conventional manner.
  • This state of charge can be determined in various ways already known in the state of the art, for example by using a differential pressure sensor at the terminals of the pollution control means, an absolute pressure sensor, at the inlet of the depollution means (backpressure), etc.
  • the supervisor and the common rail fuel supply means are adapted to control the engine according to different regeneration strategies to obtain different thermal levels in the exhaust line and in particular a first regeneration strategy compor ⁇ both level 1 strategies, S1, as designated by the general reference 11 in this figure 1 and level 2, S2, as designated by the reference 12 in this figure, and a second regeneration strategy comprising straté ⁇ level 1, S1 and an alternating sequence of level 2, S2, and supercalibrated level 2 strategies, S2 on, as designated by general reference 13 in this figure.
  • a regeneration strategy according to the invention is implemented in the system according to the invention.
  • FIG. 2 illustrates a flowchart illustrating the operation of this system for regeneration assistance.
  • the regeneration strategy implements a level 1 strategy, at 21, associated with a so-called level 2 strategy, at 22, until the end of the regeneration such as determined in 23.
  • the supervisor implements a second regeneration strategy comprising a level 1 strategy, at 21, associated with an alternating sequence of level 2 and level strategies. 2 overcalibrated, as designated 24 and 25 in this figure, until the end of the regeneration as detected at 26.
  • the pollution control means may comprise a particulate filter, such as a catalyzed particulate filter or a NOx trap.
  • the fuel may also include an additive intended to be deposited with the particles to which it is mixed, on the depollution means to facilitate their regeneration.
  • depollution means may also be impregnated with a SCR formulation providing a CO / HC oxidation function in a conventional manner.
  • oxidation catalyst means may be envisaged and the pollution control means and the oxidation catalyst means may be integrated in one and the same element, in particular on the same substrate.
  • a particulate filter incorporating the oxidation function can be envisaged.
  • NOx trap incorporating such an oxidation function can also be envisaged, whether or not it is additive.
  • This oxidation function and / or NOx trap can be filled, for example by an additive mixed with the fuel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention concerns a system for assisting regeneration of pollution management means (1) integrated in an exhaust line (3) of a diesel engine (4), wherein the engine (4) is associated with common ramp means (7, 8) injecting fuel into the cylinders thereof, based on at least one post-injection and adapted to implement, in isocouple, through modification of engine operation control parameters, at least two regeneration strategies called level 1 and level 2 strategies and a second regeneration strategy including level 1 strategies and a sequence alternating the level 2 and over-calibrated level 2 strategies, enabling different thermal levels to be achieved in the exhaust line. The invention is characterized in that it comprises means (8) for analyzing the loading state of the pollution management means and means (8) for comparing same to threshold values, to implement the first regeneration strategy for states with load lower than the threshold values or the second regeneration strategy for states with load higher than the threshold values.

Description

Système d'aide à la régénération de moyens de dépollution pour moteur de véhicule automobile La présente invention concerne un système d'aide à la régénération de moyens de dépollution intégrés dans une ligne d'échappement d'un moteur Diesel de véhicule automobile.The present invention relates to a system for assisting the regeneration of depollution means integrated in an exhaust line of a motor vehicle diesel engine.
Plus particulièrement, l'invention se rapporte à un tel système dans le¬ quel le moteur est associé à des moyens à rampe commune d'alimentation en carburant de cylindres de celui-ci, selon au moins une post-injection.More particularly, the invention relates to such a system in which the engine is associated with common cylinder fuel supply means thereof, according to at least one post-injection.
Une telle post-injection est, de façon classique, une injection de carbu¬ rant après le point mort haut du cylindre considéré.Such a post-injection is, in a conventional manner, an injection of carbu¬ rant after top dead center of the cylinder considered.
Ces moyens d'alimentation sont adaptés pour mettre en œuvre, à iso¬ couple, par modification de paramètres de contrôle de fonctionnement du moteur, différentes stratégies de régénération permettant d'obtenir des niveaux thermi¬ ques différents dans la ligne d'échappement.These power supply means are adapted to implement, at iso¬ torque, by modifying engine operating control parameters, different regeneration strategies to obtain different thermal levels in the exhaust line.
Ainsi par exemple, des moyens d'alimentation mettant en œuvre une première stratégie de régénération selon une stratégie dite de niveau 1 et une seconde stratégie de régénération selon une stratégie dite de niveau 2 et/ou une stratégie de niveau 2 surcalibré, ont déjà été proposés.Thus, for example, feed means implementing a first regeneration strategy according to a so-called level 1 strategy and a second regeneration strategy according to a so-called level 2 strategy and / or an overcalibrated level 2 strategy have already been implemented. proposed.
On sait en effet que pour assurer la régénération de moyens de dépol¬ lution tels qu'un filtre à particules, les suies piégées dans celui-ci sont brûlées grâce à la thermique fournie par le moteur et à l'exotherme réalisé par la conver¬ sion des HC et du CO sur des moyens formant catalyseur d'oxydation placés par exemple en amont du filtre à particules.It is known that in order to ensure the regeneration of depol¬ lution means such as a particulate filter, the soot trapped therein are burnt thanks to the heat supplied by the engine and to the exotherm produced by the conversion. HC and CO on oxidation catalyst means placed for example upstream of the particulate filter.
Cette combustion peut être assistée par un élément catalyseur mélan¬ gé aux suies, issu par exemple d'un additif d'aide à la régénération, mélangé au carburant d'alimentation du moteur ou bien par un catalyseur déposé directement sur les parois du filtre à particules (filtre à particules catalysé).This combustion can be assisted by a catalyst element melan¬ with soot, resulting for example from a regeneration aid additive, mixed with the engine feed fuel or by a catalyst deposited directly on the walls of the filter to particles (catalyzed particle filter).
Plus les niveaux thermiques dans la ligne d'échappement en entrée du filtre à particules sont élevés, plus la durée de régénération du filtre est courte.The higher the thermal levels in the exhaust line at the inlet of the particulate filter, the shorter the regeneration time of the filter.
Or, en conditions de roulages critiques, comme par exemple en ville ou dans des embouteillages, les niveaux atteints à travers les stratégies d'aide à la régénération classiques du filtre à particules, peuvent se révéler insuffisants pour assurer la régénération correcte du filtre, ce qui peut se traduire par des ré¬ générations très longues et donc très consommatrices de carburant, voire incom¬ plètes. Toute stratégie d'élévation de niveaux thermiques lors de ces roulages critiques permet alors d'assurer des régénérations complètes, de réduire la sur¬ consommation due à cette régénération du filtre à particules, et surtout d'augmenter la marge de sécurité par rapport à la fissuration ou à la casse de ces filtres.However, in critical driving conditions, such as in the city or in traffic jams, the levels achieved through the conventional regeneration assistance strategies of the particulate filter may be insufficient to ensure the correct regeneration of the filter. which can result in very long generations and therefore very fuel-consuming, or even incomplete. Any strategy of elevation of thermal levels during these critical rollings then makes it possible to ensure complete regenerations, to reduce the over consumption due to this regeneration of the particulate filter, and especially to increase the margin of safety with respect to the cracking or breakage of these filters.
Le but de l'invention est de proposer une telle stratégie. A cet effet, l'invention a pour objet un système d'aide à la régénération de moyens de dépollution intégrés dans une ligne d'échappement d'un moteur Diesel de véhicule automobile, dans lequel le moteur est associé à des moyens d'alimentation à rampe commune d'injection de carburant dans les cylindres de celui-ci, selon au moins une post-injection et adaptés pour mettre en œuvre, à isocouple, par modification de paramètres de contrôle du fonctionnement du mo¬ teur, au moins deux stratégies de régénération dont une première stratégie de régénération comportant des stratégies dites de niveau 1 et de niveau 2, et une seconde stratégie de régénération comportant des stratégies de niveau 1 et une séquence alternant des stratégies de niveau 2 et de niveau 2 surcalibré, permet¬ tant d'obtenir des niveaux thermiques différents dans la ligne d'échappement, caractérisé en ce qu'il comporte des moyens d'analyse de l'état de charge des moyens de dépollution et des moyens de comparaison de celui-ci à des valeurs de seuil prédéterminées, pour mettre en œuvre la première stratégie de régéné¬ ration pour les états de charge inférieurs aux valeurs de seuil ou la seconde stra¬ tégie pour les états de charge supérieurs aux valeurs de seuil. Suivant d'autres caractéristiques :The object of the invention is to propose such a strategy. For this purpose, the subject of the invention is a system for assisting the regeneration of depollution means integrated in an exhaust line of a motor vehicle diesel engine, in which the engine is associated with feed means. with common rail fuel injection into the cylinders thereof, according to at least one post-injection and adapted to implement, isocouple, by changing control parameters of the engine operation, at least two strategies of regeneration including a first regeneration strategy comprising so-called level 1 and level 2 strategies, and a second regeneration strategy comprising level 1 strategies and an alternating sequence of supercalibrated level 2 and level 2 strategies, allowing to obtain different thermal levels in the exhaust line, characterized in that it comprises means for analyzing the state of charge of the depollution means and means for comparing it with predetermined threshold values, for implementing the first regeneration strategy for the states of charge lower than the threshold values or the second strategy for the higher states of charge. threshold values. According to other characteristics:
- les moyens de dépollution comprennent un filtre à particules ; - le filtre à particules est catalysé ;the depollution means comprise a particulate filter; the particulate filter is catalyzed;
- les moyens de dépollution comprennent un piège à NOx ;the depollution means comprise a NOx trap;
- le carburant comporte un additif destiné à se déposer avec les parti¬ cules auxquelles il est mélangé, sur les moyens de dépollution pour faciliter leur régénération ; - le carburant comporte un additif formant piège à NOx,the fuel comprises an additive intended to be deposited with the particles to which it is mixed, on the means of depollution to facilitate their regeneration; the fuel comprises an additive forming a NOx trap,
- les moyens de dépollution sont imprégnés avec une formulation SCR, assurant une fonction d'oxydation CO/HC ;the depollution means are impregnated with an SCR formulation, ensuring a CO / HC oxidation function;
- le moteur est associé à un turbocompresseur ; - les états de charges des moyens de dépollution sont déterminés à partir de la perte de charge aux bornes des moyens de dépollution ; etthe engine is associated with a turbocharger; the charge states of the depollution means are determined from the pressure drop across the depollution means; and
- les états de charge sont déterminés à partir de la contre-pression en entrée des moyens de dépollution. L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :the charge states are determined from the back pressure at the inlet of the pollution control means. The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which:
- la Fig.1 représente un schéma synoptique illustrant la structure d'un système d'aide selon l'invention ; et - la Fig.2 illustre le fonctionnement de celui-ci.FIG. 1 represents a block diagram illustrating the structure of a help system according to the invention; and - Fig.2 illustrates the operation thereof.
On a en effet illustré sur la figure 1 , un système d'aide à la régénéra¬ tion de moyens de dépollution désignés par la référence générale 1 , associé à des moyens formant catalyseur d'oxydation, désignés par la référence générale 2 et placés dans une ligne d'échappement 3 d'un moteur thermique tel qu'un mo- teur Diesel de véhicule automobile.FIG. 1 has in fact illustrated a system for assisting the regeneration of depollution means designated by the general reference 1, associated with means forming an oxidation catalyst, designated by the general reference 2 and placed in an exhaust line 3 of a heat engine such as a diesel engine of a motor vehicle.
Ce moteur est désigné par la référence générale 4 et peut être associé par exemple à un turbocompresseur dont la portion de turbine 5 est associée à la ligne d'échappement et dont la portion de compresseur 6 est placée en amont du moteur. Le moteur est associé à des moyens à rampe commune d'alimentation en carburant des cylindres de celui-ci, désignés par la référence générale 7, dont le fonctionnement est contrôlé par un superviseur 8.This engine is designated by the general reference 4 and may be associated for example with a turbocharger whose turbine portion 5 is associated with the exhaust line and the compressor portion 6 is placed upstream of the engine. The engine is associated with common rail fuel supply means of the cylinders thereof, designated by the general reference 7, the operation of which is controlled by a supervisor 8.
Selon l'invention, ce système comporte également des moyens d'analyse de l'état de charge des moyens de dépollution et des moyens de com- paraison de celui-ci à des valeurs de seuil prédéterminées, pour contrôler le fonc¬ tionnement du moteur.According to the invention, this system also comprises means for analyzing the state of charge of the depollution means and means for comparing it with predetermined threshold values, in order to control the functioning of the engine. .
Les moyens d'analyse formés par exemple par le superviseur 8, sont alors reliés à des moyens de détermination de ces états de charge, désignés par la référence générale 9, délivrant ceux-ci au superviseur 8, de manière à permet- tre à celui-ci de les comparer à des valeurs de seuil telles que délivrées par des moyens de génération 10, comprenant tous moyens appropriés permettant d'établir ces valeurs de seuil.The analysis means formed for example by the supervisor 8, are then connected to means for determining these states of charge, designated by the general reference 9, delivering them to the supervisor 8, so as to allow the these are compared with threshold values as delivered by generation means 10, including any appropriate means for establishing these threshold values.
La détermination de l'état de charge des moyens de dépollution est en effet importante. Cette détermination permet de déterminer par exemple si les moyens de dépollution sont surchargés en suies ou colmatés.The determination of the state of charge of the depollution means is indeed important. This determination makes it possible to determine, for example, whether the depollution means are overloaded with soot or clogged.
Dans le cas où les moyens de dépollution sont surchargés en suies, il y a en effet un risque de fissuration des moyens de dépollution et en particulier du filtre à particules lors de la prochaine régénération. Il faut donc régénérer ce filtre à particules sans l'endommager et avoir des températures les plus élevées possible, pour minimiser le risque de fissuration du substrat de ces moyens.In the case where the pollution control means are overloaded with soot, there is indeed a risk of cracking of the pollution control means and in particular of the particulate filter during the next regeneration. It is therefore necessary to regenerate this particulate filter without damaging it and to have the highest temperatures possible, to minimize the risk of cracking of the substrate of these means.
Lorsque le filtre est colmaté, non seulement il y a un risque d'endommagement de ce filtre lors de la prochaine régénération, mais il y a éga- lement un risque pour la tenue du moteur.When the filter is clogged, not only is there a risk of damage to this filter during the next regeneration, but there is also a risk for the engine's resistance.
Il convient donc de tenir compte de ces différents problèmes pour op¬ timiser la prochaine régénération du filtre.These various problems must therefore be taken into account in order to optimize the next regeneration of the filter.
Dans le système selon l'invention, on détermine l'état de charge des moyens de dépollution pour adapter la stratégie de régénération. Ainsi, cet état de charge peut être déterminé à partir de la perte de charge mesurée aux bornes des moyens de dépollution et en particulier du filtre à particules, de façon classique.In the system according to the invention, the state of charge of the depollution means is determined in order to adapt the regeneration strategy. Thus, this state of charge can be determined from the pressure drop measured at the terminals of the pollution control means and in particular of the particle filter, in a conventional manner.
Ces états de charge ainsi déterminés sont ensuite comparés à des va¬ leurs de seuil pour déterminer la stratégie optimale à appliquer. Cet état de charge peut être déterminé selon différentes façons déjà connues dans l'état de la technique, par exemple en utilisant un capteur de pres¬ sion différentielle aux bornes des moyens de dépollution, un capteur de pression absolue, en entrée des moyens de dépollution (contre-pression), etc.These states of charge thus determined are then compared with threshold values to determine the optimal strategy to be applied. This state of charge can be determined in various ways already known in the state of the art, for example by using a differential pressure sensor at the terminals of the pollution control means, an absolute pressure sensor, at the inlet of the depollution means (backpressure), etc.
En fait, le superviseur et les moyens à rampe commune d'alimentation en carburant sont adaptés pour piloter le moteur selon différentes stratégies de régénération permettant d'obtenir des niveaux thermiques différents dans la ligne d'échappement et en particulier une première stratégie de régénération compor¬ tant des stratégies de niveau 1 , S1 , telle que désignée par la référence générale 11 sur cette figure 1 et de niveau 2, S2, telle que désignée par la référence 12 sur cette figure, et une seconde stratégie de régénération comportant des straté¬ gies de niveau 1 , S1 et une séquence alternant des stratégies de niveau 2, S2, et de niveau 2 surcalibré, S2 sur, telle que désignée par la référence générale 13 sur cette figure. En fait, dans le système selon l'invention, et en fonction des résultats de la comparaison opérée par les moyens de comparaison des état de charge des moyens de dépollution aux valeurs de seuil prédéterminées, on met en œu¬ vre une stratégie de régénération selon un mode de fonctionnement en niveau 1 et en niveau 2 pour les états de charge inférieurs aux valeurs de seuil prédéter¬ minées ou selon un mode de fonctionnement en niveau 1 associé à une sé¬ quence alternant des modes de fonctionnement en niveau 2 et en niveau 2 sur¬ calibré, pour les états de charge supérieurs aux valeurs de seuil prédéterminées.In fact, the supervisor and the common rail fuel supply means are adapted to control the engine according to different regeneration strategies to obtain different thermal levels in the exhaust line and in particular a first regeneration strategy compor ¬ both level 1 strategies, S1, as designated by the general reference 11 in this figure 1 and level 2, S2, as designated by the reference 12 in this figure, and a second regeneration strategy comprising straté¬ level 1, S1 and an alternating sequence of level 2, S2, and supercalibrated level 2 strategies, S2 on, as designated by general reference 13 in this figure. In fact, in the system according to the invention, and as a function of the results of the comparison made by the means for comparing the state of charge of the depollution means with the predetermined threshold values, a regeneration strategy according to the invention is implemented. a mode of operation in level 1 and in level 2 for the states of charge lower than the threshold values predefined or according to a mode of operation in level 1 associated with an alternating sequence of modes of operation in level 2 and level 2 sur¬ calibrated, for the states of charge higher than the predetermined threshold values.
Ceci permet alors de maximiser les chances de réussite de la régéné- ration notamment en conditions de roulages critiques, comme par exemple en ville ou dans des embouteillages.This then makes it possible to maximize the chances of success of the regeneration, especially in critical driving conditions, for example in cities or in traffic jams.
A titre d'exemple, on peut passer des critères suivants pour une calibration classique d'aide à la régénération d'un filtre à particules de niveau 2 :By way of example, the following criteria can be passed for a conventional calibration of aid for the regeneration of a level 2 particulate filter:
- température maximale collecteur d'échappement =800°C- maximum temperature exhaust manifold = 800 ° C
- exotherme catalyseur maximal = 15O0Cmaximum catalyst exotherm = 15O 0 C
- température sortie catalyseur maximale = 71O0Cmaximum catalyst outlet temperature = 71O 0 C
- température interne catalyseur maximale = 76O0Cmaximum internal catalyst temperature = 76O 0 C
- teneur en oxygène minimale des gaz en sortie catalyseur = 3%- minimum oxygen content of the catalyst exit gas = 3%
aux critères suivants pour une stratégie de niveau 2 surcalibré :the following criteria for an over-calibrated level 2 strategy:
- température maximale collecteur d'échappement =830°C- maximum temperature exhaust manifold = 830 ° C
- exotherme catalyseur maximal = 2000C- exotherm maximum catalyst = 200 0 C
- température sortie catalyseur maximale = 73O0Cmaximum catalyst outlet temperature = 73O 0 C
- température interne catalyseur maximale = pas de valeur maximale- maximum internal catalyst temperature = no maximum value
- teneur en oxygène minimale des gaz en sortie catalyseur = 2% ;minimum oxygen content of the catalyst output gases = 2%;
Avec les résultats suivants :With the following results:
- température en entrée du FAP de 600 0Cinput temperature of the FAP of 600 ° C.
Cycles EUDC atteinte en 200 sec. au lieu de 600 sec . avec l'aide à laEUDC cycles reached in 200 sec. instead of 600 sec. with help to
RG standard RG standard
On a illustré sur la figure 2, un organigramme illustrant le fonctionne¬ ment de ce système d'aide à la régénération.FIG. 2 illustrates a flowchart illustrating the operation of this system for regeneration assistance.
Celui-ci débute par une phase d'acquisition de l'état de charge des moyens de dépollution à partir des différentes informations mentionnées précé¬ demment.This begins with a phase of acquisition of the state of charge of the pollution control means from the various information mentioned above.
Ces états de charge sont ensuite comparés par le superviseur, en 20, à des valeurs de seuil.These states of charge are then compared by the supervisor, at 20, to threshold values.
Si les états de charge sont inférieurs aux valeurs de seuil, la stratégie de régénération met en œuvre une stratégie de niveau 1 , en 21 , associée à une stratégie dite de niveau 2, en 22, jusqu'à la fin de la régénération telle que déter¬ minée en 23.If the states of charge are lower than the threshold values, the regeneration strategy implements a level 1 strategy, at 21, associated with a so-called level 2 strategy, at 22, until the end of the regeneration such as determined in 23.
Par contre, si les états de charge sont supérieurs aux valeurs de seuil, le superviseur met en œuvre une seconde stratégie de régénération comportant une stratégie de niveau 1 , en 21 , associée à une séquence alternant des straté¬ gies de niveau 2 et de niveau 2 surcalibré, telles que désignées par 24 et 25 sur cette figure, jusqu'à la fin de la régénération telle que détectée en 26.On the other hand, if the states of charge are greater than the threshold values, the supervisor implements a second regeneration strategy comprising a level 1 strategy, at 21, associated with an alternating sequence of level 2 and level strategies. 2 overcalibrated, as designated 24 and 25 in this figure, until the end of the regeneration as detected at 26.
Il va de soi bien entendu que différents modes de réalisation de ce système peuvent être envisagés et que les moyens de dépollution peuvent com- porter un filtre à particules, comme par exemple un filtre à particules catalysé ou encore un piège à NOx. De plus, le carburant peut également comporter un additif destiné à se déposer avec les particules auquel il est mélangé, sur les moyens de dépollution pour faciliter leur régénération.It goes without saying of course that different embodiments of this system may be envisaged and that the pollution control means may comprise a particulate filter, such as a catalyzed particulate filter or a NOx trap. In addition, the fuel may also include an additive intended to be deposited with the particles to which it is mixed, on the depollution means to facilitate their regeneration.
Ces moyens de dépollution peuvent également être imprégnés avec une formulation SCR assurant une fonction d'oxydation CO/HC de façon classi¬ que.These depollution means may also be impregnated with a SCR formulation providing a CO / HC oxidation function in a conventional manner.
D'autres moyens formant catalyseur d'oxydation peuvent être envisa¬ gés et les moyens de dépollution et les moyens formant catalyseur d'oxydation peuvent être intégrés dans un seul et même élément, notamment sur le même substrat.Other oxidation catalyst means may be envisaged and the pollution control means and the oxidation catalyst means may be integrated in one and the same element, in particular on the same substrate.
A titre d'exemple, un filtre à particules intégrant la fonction d'oxydation peut être envisagé.By way of example, a particulate filter incorporating the oxidation function can be envisaged.
De même, un piège à NOx intégrant une telle fonction d'oxydation peut également être envisagé, que celui-ci soit additivé ou non. Cette fonction d'oxydation et/ou de piège à NOx peut être remplie, par exemple par un additif mélangé au carburant. Similarly, a NOx trap incorporating such an oxidation function can also be envisaged, whether or not it is additive. This oxidation function and / or NOx trap can be filled, for example by an additive mixed with the fuel.

Claims

REVENDICATIONS
1. Système d'aide à la régénération de moyens de dépollution (1 ) inté¬ grés dans une ligne d'échappement (3) d'un moteur Diesel (4) de véhicule auto¬ mobile, dans lequel le moteur (4) est associé à des moyens d'alimentation (7) à rampe commune d'injection de carburant dans les cylindres de celui-ci, selon au moins une post-injection et adaptés pour mettre en œuvre, à isocouple, par modi¬ fication de paramètres de contrôle du fonctionnement du moteur, au moins deux stratégies de régénération dont une première stratégie de régénération compor¬ tant des stratégies dites de niveau 1 et de niveau 2, et une seconde stratégie de régénération comportant des stratégies de niveau 1 et une séquence alternant des stratégies de niveau 2 et de niveau 2 surcalibré, permettant d'obtenir des niveaux thermiques différents dans la ligne d'échappement, caractérisé en ce qu'il comporte des moyens (8) d'analyse de l'état de charge des moyens de dé¬ pollution et des moyens (8) de comparaison de celui-ci à des valeurs de seuil prédéterminées, pour mettre en œuvre la première stratégie de régénération pour les états de charge inférieurs aux valeurs de seuil ou la seconde stratégie pour les états de charge supérieurs aux valeurs de seuil.1. System for assisting the regeneration of depollution means (1) inté¬ grés in an exhaust line (3) of a diesel engine (4) auto¬ mobile vehicle, wherein the engine (4) is associated with supply means (7) with common fuel injection rail in the cylinders thereof, according to at least one post-injection and adapted to implement, to isocouple, by modi¬ fication of parameters of control of the operation of the engine, at least two regeneration strategies including a first regeneration strategy comprising so-called level 1 and level 2 strategies, and a second regeneration strategy comprising level 1 strategies and an alternating sequence of strategies level 2 and level 2 overcalibrated, to obtain different thermal levels in the exhaust line, characterized in that it comprises means (8) for analyzing the state of charge of the means of dé¬ pollution e t means (8) for comparing it with predetermined threshold values, for implementing the first regeneration strategy for the states of charge lower than the threshold values or the second strategy for the states of charge higher than the values. threshold.
2. Système selon la revendication 1 , caractérisé en ce que les moyens de dépollution comprennent un filtre à particules. 2. System according to claim 1, characterized in that the pollution control means comprise a particulate filter.
3. Système selon la revendication 2, caractérisé en ce que le filtre à particules est catalysé.3. System according to claim 2, characterized in that the particulate filter is catalyzed.
4. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens de dépollution comprennent un piège à NOx.4. System according to any one of the preceding claims, characterized in that the pollution control means comprise a NOx trap.
5. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que le carburant comporte un additif destiné à se déposer avec les particules auxquelles il est mélangé, sur les moyens de dépollution pour facili¬ ter leur régénération.5. System according to any one of the preceding claims, characterized in that the fuel comprises an additive intended to be deposited with the particles to which it is mixed, on the means of depollution to facilitate their regeneration.
6. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que le carburant comporte un additif formant piège à NOx. 6. System according to any one of the preceding claims, characterized in that the fuel comprises a NOx trap additive.
7. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens de dépollution sont imprégnés avec une formu¬ lation SCR, assurant une fonction d'oxydation CO/HC.7. System according to any one of the preceding claims, characterized in that the pollution control means are impregnated with a formu¬ lation SCR, providing a CO / HC oxidation function.
8. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que le moteur (4) est associé à un turbocompresseur (5,6). 8. System according to any one of the preceding claims, characterized in that the engine (4) is associated with a turbocharger (5,6).
9. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que les états de charge des moyens de dépollution sont déter¬ minés à partir de la perte de charge aux bornes des moyens de dépollution (1 ).9. System according to any one of the preceding claims, characterized in that the charge states of the pollution control means are determined from the pressure drop across the pollution control means (1).
10. Système selon l'une quelconque des revendications 1 à 8, caracté- ' risé en ce que les états de charge sont déterminés à partir de la contre-pression en entrée des moyens de dépollution. 10. A system according to any one of claims 1 to 8, charac- 'Rise in that the load states are determined from the against-pressure inlet of the depollution means.
EP05778239A 2004-06-23 2005-06-20 System for assisting regeneration of pollution management means for motor vehicle engine Withdrawn EP1759109A1 (en)

Applications Claiming Priority (2)

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FR0406854A FR2872202B1 (en) 2004-06-23 2004-06-23 EMERGENCY MEANS REGENERATION SYSTEM FOR MOTOR VEHICLE ENGINE
PCT/FR2005/050460 WO2006005863A1 (en) 2004-06-23 2005-06-20 System for assisting regeneration of pollution management means for motor vehicle engine

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FR2872214B1 (en) 2004-06-23 2006-11-03 Peugeot Citroen Automobiles Sa SYSTEM FOR MONITORING THE REGENERATION OF MEANS OF DEPOLLUTION
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US20080196394A1 (en) 2008-08-21
US7596942B2 (en) 2009-10-06
WO2006005863A1 (en) 2006-01-19
FR2872202A1 (en) 2005-12-30

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