FR2774428A1 - System for regenerating a particle filter in a diesel engine exhaust pipe - Google Patents

System for regenerating a particle filter in a diesel engine exhaust pipe Download PDF

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Publication number
FR2774428A1
FR2774428A1 FR9801169A FR9801169A FR2774428A1 FR 2774428 A1 FR2774428 A1 FR 2774428A1 FR 9801169 A FR9801169 A FR 9801169A FR 9801169 A FR9801169 A FR 9801169A FR 2774428 A1 FR2774428 A1 FR 2774428A1
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France
Prior art keywords
fuel
injection
cylinders
injectors
engine
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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.)
Granted
Application number
FR9801169A
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French (fr)
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FR2774428B1 (en
Inventor
Jacques Portalier
Olivier Salvat
Tallec Patrice Le
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Automobiles Peugeot SA
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Automobiles Peugeot SA
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Priority to FR9801169A priority Critical patent/FR2774428B1/en
Publication of FR2774428A1 publication Critical patent/FR2774428A1/en
Application granted granted Critical
Publication of FR2774428B1 publication Critical patent/FR2774428B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • 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
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/405—Multiple injections with post injections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • 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

Abstract

The injection (6) of additional fuel into the engine cylinder (1) during expansion increases the hydrocarbon and carbon monoxide present in the exhaust (2). This produces a supplementary combustion in the exhaust pipe, burning particles off the filter and starting to regenerate it. System for helping regeneration of a particle filter (4) fitted into an exhaust pipe (2) for a diesel engine (1), in particular for a vehicle engine. Means (5, 6, 7) of injecting an additional quantity of fuel into at least certain engine cylinders, after the main injection and during expansion, causes a supplementary combustion of the exhaust gases to start the filter regeneration. The timing of the injection is calibrated to obtain a required temperature on exit from the cylinders. The means of injection include electrically controlled injectors (6) connected to the cylinders, and are fed by a fuel supply (5) common to all the injectors. The means of injection also have a central unit (7) for data collection and injector control.

Description

La présente invention concerne un système d'aide à la régénération d'un filtre à particules intégré dans une ligne d'échappement de moteur Diesel notamment de véhicule automobile. The present invention relates to a system for assisting the regeneration of a particulate filter integrated in an exhaust line of a diesel engine, in particular of a motor vehicle.

On sait que l'une des préoccupations les plus importantes des équipementiers et des constructeurs de véhicules automobiles, est la réduction de la pollution engendrée par le fonctionnement de ceux-ci. We know that one of the most important concerns of equipment manufacturers and motor vehicle manufacturers is the reduction of the pollution generated by their operation.

Ceci est en particulier le cas pour les moteurs Diesel. This is particularly the case for diesel engines.

Différentes solutions ont donc été envisagées pour tenter de réduire le niveau de pollution de ces moteurs. Different solutions have therefore been envisaged in an attempt to reduce the level of pollution of these engines.

C'est ainsi par exemple que l'on a déjà proposé dans l'état de la technique, d'intégrer dans les lignes d'échappement de ces moteurs Diesel, des filtres à particules. Thus, for example, it has already been proposed in the prior art, to integrate particulate filters into the exhaust lines of these diesel engines.

Ceux-ci sont alors adaptés pour piéger les particules ou suies contenues dans les gaz d'échappement de ces moteurs et les brûler lors d'une phase de régénération du filtre. These are then adapted to trap particles or soot contained in the exhaust gases of these engines and burn them during a regeneration phase of the filter.

Différents moyens d'aide à la régénération de ces filtres ont déjà été développés dans l'état de la technique. Various means of assisting in the regeneration of these filters have already been developed in the state of the art.

Cependant, aucun de ceux-ci ne donne pleinement satisfaction. However, none of these are fully satisfactory.

Le but de l'invention est donc de résoudre ces problèmes. The object of the invention is therefore to solve these problems.

A cet effet, l'invention a pour objet un système d'aide à la régénération d'un filtre à particules intégré dans une ligne d'échappement de moteur Diesel notamment de véhicule automobile, caractérisé en ce qu'il comporte des moyens d'injection d'une quantité supplémentaire de carburant dans au moins certains des cylindres du moteur, après l'injection principale de carburant dans ceux-ci, pendant la phase de détente du cycle des cylindres afin de provoquer une combustion supplémentaire de carburant dans ces cylindres et augmenter la température des gaz d'échappement de ceux-ci pour déclencher la régénération du filtre à particules. To this end, the subject of the invention is a system for assisting the regeneration of a particulate filter integrated in an exhaust line of a diesel engine, in particular of a motor vehicle, characterized in that it comprises means for injection of an additional quantity of fuel into at least some of the engine cylinders, after the main injection of fuel into them, during the expansion phase of the cylinder cycle in order to cause additional combustion of fuel in these cylinders and increase the exhaust gas temperature to trigger the regeneration of the particulate filter.

L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant au dessin annexé, qui représente un schéma synoptique illustrant la structure générale d'un système d'aide à la régénération selon l'invention. The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawing, which represents a block diagram illustrating the general structure of a system for assisting in regeneration according to the invention.

On reconnaît en effet sur la figure 1, un moteur
Diesel 1 de véhicule automobile, dont la sortie des gaz d'échappement est reliée à une ligne d'échappement 2.We recognize in fact in Figure 1, a motor
Motor vehicle diesel 1, the exhaust gas outlet of which is connected to an exhaust line 2.

Cette ligne d'échappement peut par exemple être associée à un turbocompresseur désigné par la référence générale 3 et plus particulièrement à la portion de turbine de celui-ci. This exhaust line can for example be associated with a turbocharger designated by the general reference 3 and more particularly with the turbine portion thereof.

Après passage dans cette turbine, les gaz s'écoulent à travers un filtre à particules désigné par la référence générale 4 et présentant n'importe quelle structure appropriée connue dans l'état de la technique. After passing through this turbine, the gases flow through a particle filter designated by the general reference 4 and having any suitable structure known in the state of the art.

L'alimentation en carburant du moteur 1 est assurée par exemple par l'intermédiaire d'un système d'alimentation commune de tous les cylindres, désigné par la référence générale 5 sur cette figure, comportant par exemple un dispositif à rail d'alimentation commune, également connu dans l'état de la technique sous le nom de COMMON RAIL. The fuel supply of the engine 1 is ensured for example by means of a common supply system of all the cylinders, designated by the general reference 5 in this figure, comprising for example a device with common supply rail , also known in the state of the art as COMMON RAIL.

Ce système est alors équipé d'injecteurs à commande par exemple électrique, dont l'un est désigné par la référence générale 6 sur cette figure. This system is then fitted with injectors with electrical control, for example, one of which is designated by the general reference 6 in this figure.

Le fonctionnement de ces différents injecteurs à l'ouverture et à la fermeture est piloté par une unité centrale de traitement d'informations désignée par la référence générale 7 sur cette figure. The operation of these different injectors on opening and closing is controlled by a central information processing unit designated by the general reference 7 in this figure.

Selon l'invention, ce système comporte également des moyens d'injection d'une quantité supplémentaire de carburant dans au moins certains des cylindres du moteur, après l'injection principale de carburant dans ceux-ci et pendant la phase de détente du cycle de ces cylindres, afin de provoquer une combustion supplémentaire de carburant dans ces cylindres et augmenter la température des gaz d'échappement de ceux-ci pour déclencher la régénération du filtre à particules. According to the invention, this system also comprises means for injecting an additional quantity of fuel into at least some of the engine cylinders, after the main injection of fuel into them and during the expansion phase of the these cylinders, in order to cause additional combustion of fuel in these cylinders and to increase the temperature of the exhaust gases thereof to trigger the regeneration of the particulate filter.

Dans l'exemple de réalisation décrit sur cette figure, ces moyens d'injection de la quantité supplémentaire de carburant sont formés par les injecteurs à commande élec trique, par exemple 6, du système d'alimentation commune de tous les cylindres, qui sont alors pilotés de façon appropriée par l'unité centrale de traitement d'informations 7. In the embodiment described in this figure, these means for injecting the additional quantity of fuel are formed by the electrically controlled injectors, for example 6, of the common supply system of all the cylinders, which are then appropriately controlled by the central information processing unit 7.

En fait, ce système d'alimentation est adapté pour effectuer une injection supplémentaire de carburant au début de la phase de détente du cycle, c'est-à-dire après l'injection principale de carburant. In fact, this supply system is suitable for carrying out an additional fuel injection at the start of the expansion phase of the cycle, that is to say after the main fuel injection.

Cet apport de carburant supplémentaire ayant lieu peu après la fin de l'injection principale, la chaleur dégagée par la combustion principale permet l'inflammation du carburant apportée par cette post-injection. This addition of additional fuel taking place shortly after the end of the main injection, the heat released by the main combustion allows the ignition of the fuel provided by this post-injection.

L'énergie dégagée par cette combustion tardive ou post-combustion est principalement transformée en chaleur, qui est alors communiquée aux gaz d'échappement, avec une faible augmentation de la pression dans les cylindres. The energy released by this late combustion or post-combustion is mainly transformed into heat, which is then communicated to the exhaust gases, with a slight increase in the pressure in the cylinders.

On obtient ainsi un accroissement de la température des gaz d'échappement, cet accroissement de température des gaz et donc du filtre traversé par ces gaz, permettant d'atteindre le niveau thermique nécessaire pour initier la combustion des suies piégées dans ce filtre à particules lorsque celui-ci doit être régénéré. An increase in the temperature of the exhaust gases is thus obtained, this increase in temperature of the gases and therefore of the filter through which these gases pass, making it possible to reach the thermal level necessary to initiate the combustion of the soot trapped in this particulate filter when this must be regenerated.

On conçoit bien entendu que cette phase de régénération peut être déclenchée de différentes manières appropriées, par exemple par détermination de l'état d'encrassement du filtre à particules, d'une distance prédéterminée parcourue par le véhicule, etc. It will of course be understood that this regeneration phase can be triggered in various appropriate ways, for example by determining the state of fouling of the particle filter, a predetermined distance traveled by the vehicle, etc.

Il va de soi bien entendu que d'autres modes de réalisation d'un tel système peuvent être envisagés et que des injecteurs différents de ceux utilisés dans le système d'injection principale de carburant peuvent être envisagés, de même que d'autres systèmes d'alimentation en carburant du moteur.  It goes without saying of course that other embodiments of such a system can be envisaged and that injectors different from those used in the main fuel injection system can be envisaged, as well as other systems of fuel supply to the engine.

Claims (5)

REVENDICATIONS 1. Système d'aide à la régénération d'un filtre à particules (4) intégré dans une ligne d'échappement (2) de moteur Diesel (1) notamment de véhicule automobile, caractérisé en ce qu'il comporte des moyens (5,6,7) d'injection d'une quantité supplémentaire de carburant dans au moins certains des cylindres du moteur, après l'injection principale de carburant dans ceux-ci, pendant la phase de détente du cycle des cylindres afin de provoquer une combustion supplémentaire de carburant dans ces cylindres et augmenter la température des gaz d'échappement de ceux-ci pour déclencher la régénération du filtre à particules (4). 1. System for assisting the regeneration of a particulate filter (4) integrated in an exhaust line (2) of a diesel engine (1), in particular of a motor vehicle, characterized in that it comprises means (5 , 6,7) injection of an additional quantity of fuel into at least some of the engine cylinders, after the main injection of fuel into them, during the expansion phase of the cylinder cycle in order to cause combustion additional fuel in these cylinders and increase the temperature of the exhaust gases to trigger the regeneration of the particulate filter (4). 2. Système selon la revendication 1, caractérisé en ce que les moyens d'injection de la quantité supplémentaire de carburant comprennent des injecteurs (6) à commande électrique associés aux cylindres du moteur (1). 2. System according to claim 1, characterized in that the means for injecting the additional quantity of fuel comprise injectors (6) with electric control associated with the cylinders of the engine (1). 3. Système selon la revendication 2, caractérisé en ce que les injecteurs (6) sont formés par des injecteurs d'un système d'alimentation (5) en carburant du moteur. 3. System according to claim 2, characterized in that the injectors (6) are formed by injectors of a supply system (5) with engine fuel. 4. Système selon la revendication 3, caractérisé en ce que le système d'alimentation (5) comporte un dispositif à rail d'alimentation commune de tous les injecteurs. 4. System according to claim 3, characterized in that the supply system (5) comprises a device with a common supply rail for all the injectors. 5. Système selon lwune quelconque des revendications 2 à 4, caractérisé en ce que les moyens d'injection comportent une unité centrale (7) de traitement d'informations et de pilotage des injecteurs (6).  5. System according to any of claims 2 to 4, characterized in that the injection means comprise a central unit (7) for processing information and controlling the injectors (6).
FR9801169A 1998-02-02 1998-02-02 SYSTEM FOR AIDING THE REGENERATION OF A PARTICLE FILTER INTEGRATED IN A DIESEL ENGINE EXHAUST SYSTEM, ESPECIALLY A MOTOR VEHICLE Expired - Fee Related FR2774428B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9801169A FR2774428B1 (en) 1998-02-02 1998-02-02 SYSTEM FOR AIDING THE REGENERATION OF A PARTICLE FILTER INTEGRATED IN A DIESEL ENGINE EXHAUST SYSTEM, ESPECIALLY A MOTOR VEHICLE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9801169A FR2774428B1 (en) 1998-02-02 1998-02-02 SYSTEM FOR AIDING THE REGENERATION OF A PARTICLE FILTER INTEGRATED IN A DIESEL ENGINE EXHAUST SYSTEM, ESPECIALLY A MOTOR VEHICLE

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FR2774428A1 true FR2774428A1 (en) 1999-08-06
FR2774428B1 FR2774428B1 (en) 2000-04-28

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1310656A1 (en) * 2001-11-13 2003-05-14 Peugeot Citroen Automobiles SA System for assisting the regeneration of an exhaust gas purifying system comprised in the exhaust pipe of a vehicle engine
US6594990B2 (en) 2000-11-03 2003-07-22 Ford Global Technologies, Llc Method for regenerating a diesel particulate filter
WO2004081360A1 (en) * 2003-03-11 2004-09-23 Fiat Auto S.P.A. A process for control of the temperature in a device for filtering the exhaust gas of an internal combustion engine
FR2906310A1 (en) * 2006-09-26 2008-03-28 Renault Sas DEVICE FOR CONTROLLING A DIESEL ENGINE ENGINE ASSEMBLY FOR ENHANCED PARTICLE FILTER REGENERATION STRATEGY.

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Publication number Priority date Publication date Assignee Title
JPS5968512A (en) * 1982-10-09 1984-04-18 Diesel Kiki Co Ltd Fuel supplying device by distributing type fuel injection pump for treatment of fine particle in exhaust gas of internal-combustion engine
JPH07259533A (en) * 1994-03-23 1995-10-09 Nippon Soken Inc Exhaust particulate control device of internal combustion engine
JPH07279645A (en) * 1994-04-01 1995-10-27 Nippon Soken Inc Exhaust gas particulate purifier of internal combustion engine
WO1996003571A1 (en) * 1994-07-22 1996-02-08 C.R.F. Societa' Consortile Per Azioni Method of automatically initiating regeneration of a particulate filter of a diesel engine with a rail injection system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968512A (en) * 1982-10-09 1984-04-18 Diesel Kiki Co Ltd Fuel supplying device by distributing type fuel injection pump for treatment of fine particle in exhaust gas of internal-combustion engine
JPH07259533A (en) * 1994-03-23 1995-10-09 Nippon Soken Inc Exhaust particulate control device of internal combustion engine
JPH07279645A (en) * 1994-04-01 1995-10-27 Nippon Soken Inc Exhaust gas particulate purifier of internal combustion engine
WO1996003571A1 (en) * 1994-07-22 1996-02-08 C.R.F. Societa' Consortile Per Azioni Method of automatically initiating regeneration of a particulate filter of a diesel engine with a rail injection system

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Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 174 (M - 316) 10 August 1984 (1984-08-10) *
PATENT ABSTRACTS OF JAPAN vol. 096, no. 002 29 February 1996 (1996-02-29) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6594990B2 (en) 2000-11-03 2003-07-22 Ford Global Technologies, Llc Method for regenerating a diesel particulate filter
EP1310656A1 (en) * 2001-11-13 2003-05-14 Peugeot Citroen Automobiles SA System for assisting the regeneration of an exhaust gas purifying system comprised in the exhaust pipe of a vehicle engine
FR2832182A1 (en) * 2001-11-13 2003-05-16 Peugeot Citroen Automobiles Sa ASSISTANCE SYSTEM FOR THE REGENERATION OF EMISSION CONTROL MEASURES INTEGRATED IN AN EXHAUST SYSTEM OF A MOTOR VEHICLE
US6837042B2 (en) 2001-11-13 2005-01-04 Peugeot Citroen Automobiles Sa System for aiding the regeneration of pollution-control means that are integrated in an exhaust line of a motor vehicle engine
WO2004081360A1 (en) * 2003-03-11 2004-09-23 Fiat Auto S.P.A. A process for control of the temperature in a device for filtering the exhaust gas of an internal combustion engine
FR2906310A1 (en) * 2006-09-26 2008-03-28 Renault Sas DEVICE FOR CONTROLLING A DIESEL ENGINE ENGINE ASSEMBLY FOR ENHANCED PARTICLE FILTER REGENERATION STRATEGY.
WO2008037902A1 (en) * 2006-09-26 2008-04-03 Renault S.A.S. Control device for an engine assembly with a diesel engine that makes possible an improved particle filter regeneration strategy

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