WO2006064155A1 - Procede d'optimisation de la regeneration d'un filtre a particules et systeme mettant en oeuvre ce procede - Google Patents
Procede d'optimisation de la regeneration d'un filtre a particules et systeme mettant en oeuvre ce procede Download PDFInfo
- Publication number
- WO2006064155A1 WO2006064155A1 PCT/FR2005/051068 FR2005051068W WO2006064155A1 WO 2006064155 A1 WO2006064155 A1 WO 2006064155A1 FR 2005051068 W FR2005051068 W FR 2005051068W WO 2006064155 A1 WO2006064155 A1 WO 2006064155A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dispersion
- injection
- determining
- engine
- correction
- Prior art date
Links
Classifications
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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
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- 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
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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
- 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
- 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
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- 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 control method of a combustion engine comprising in particular an engine block and a particulate filter.
- An application of such a method is particularly advantageous in diesel type engines when regenerating the particulate filter.
- This type of process essentially consists in increasing, during a so-called regeneration phase, the temperature of the exhaust gas in the particulate filter so as to reach the combustion temperature of the particles to be burned.
- TDC top dead center
- this injection takes place at a crank angle of about sixty degrees.
- Such an additional injection will be designated later in the text by late post-injection. And more particularly, it will correspond to a fuel injection between about one hundred and ten and one hundred and twenty degrees crankshaft angle.
- the excess fuel will not burn in the combustion chamber, but in a catalytic part provided in addition to the particulate filter.
- the hydrocarbons and the carbon monoxides resulting from the late injections oxidize on the catalytic sites, which leads advantageously heat releases, resulting in an increase in the temperature of the exhaust gas.
- said catalytic portion may consist of an oxidation catalyst installed upstream of the particulate filter in the exhaust line, or else of a catalytic material (for example a platinum) disposed within the latter. (FAP).
- a catalytic material for example a platinum
- a limitation concerns a temperature dispersion at the inlet of the particulate filter.
- This dispersion can be explained as follows.
- Said catalytic portion of oxidation produces an exotherm which depends in particular on the amounts of reducing agents that are, for example, hydrocarbons and carbon monoxides resulting from late post-injections.
- the thermal level at the inlet of the filter may be a function of one hand of these amounts of reducing agents sent to said catalytic portion and secondly of a heat conversion rate of the latter.
- the mass of fuel actually injected into the combustion chamber can vary from a few milligrams from one engine to another.
- said catalytic portion may itself have a dispersive oxidation power, that is to say a heat transfer rate dispersive.
- An object of the present invention is therefore to overcome to a certain extent these disadvantages and to provide a method that allows an efficient and robust regeneration in terms of dispersions.
- the present invention proposes a method of controlling a vehicle engine, the engine comprising a particle filter, characterized in that it comprises a step of determining a difference between an average gas temperature measured in filter input and a set temperature.
- Said method further comprises a step of correcting a mean flow rate (OD) for late post-injection of fuel into a combustion chamber of an engine block which depends on said gap in order to compensate for it;
- OD mean flow rate
- the step of determining the deviation and the step of correcting the average current flow (OD) are interrupted if the one or one of the predetermined conditions is not respected;
- the step of determining the deviation and the late post-injection mean flow rate (OD) correction step make it possible to correct a dispersion with respect to a given specification of at least one element of the engine, this dispersion being related to at least one of the following: - wear of the element,
- the deviation determination step and the late post-injection mean flow (OD) correction step make it possible to correct at least one of the following dispersions with respect to a given specification: dispersion of a oxidation capacity of a catalytic part in cooperation with the particulate filter,
- the present invention also provides a vehicle engine, comprising a particle filter, characterized in that it comprises means capable of determining a difference between an average gas temperature measured at the inlet of the particulate filter and a set temperature.
- a preferred but non-limiting aspect of this engine is that it further comprises means adapted to correct a mean flow rate (OD) of late post-fuel injection in a combustion chamber which depends on said deviation.
- OD mean flow rate
- the invention advantageously makes it possible to obtain regeneration of the effective and robust particulate filter, and moreover in a simple and inexpensive way.
- the method makes it possible to compensate for average temperature differences at the inlet of the particulate filter that can come from a large number of dispersions. They may concern different elements of an engine and come from wear problems as well as manufacturing problems (dispersion from one element to another).
- FIG. 2 graphically illustrates, for a so-called "nominal" motor, an observable difference between a temperature measurement at the inlet of the particulate filter and a target temperature during a regeneration
- Figure 3 illustrates graphically, and a so-called "cold" motor, an observable difference between an input temperature measurement of the particulate filter and a target temperature during a regeneration.
- FIG. I 7 there is shown an engine comprising a motor unit 10, the exhaust gas 12 passes successively through a turbocharger 20, a catalyst 30 and a particulate filter 40.
- Temperature sensors 50 make it possible to measure temperatures 55 at the inlet of the particulate filter 40.
- control signal 65 is representative, in particular, of a certain quantity of fuel to be injected in real time in each combustion chamber 11.
- the management unit 60 controls an increase, respectively a decrease, of the quantity of fuel post-injected late to raise, respectively lower, the temperature of said gases and bring them as close as possible to the set value.
- FIG. 2 shows such a regulation when it is said to be functional.
- post-injection flow control signal 65 evolves between two bounded quantities 101 and 102, which corresponds to normal operation.
- the basic setting of the late post-injection flow leads to a temperature at the inlet of the filter relatively close to the target temperature, so that the late post-injection flow control remains relatively limited and oscillates around an average value. DO.
- control signal 65 does not oscillate around the average value DO or at least between the two aforementioned terminals.
- Figure 3 Such a situation is illustrated in Figure 3 where it can be seen that the signal 65 is glued to one of the terminals (the terminal 101 here).
- such a control method is advantageously completed by a motor control method which makes it possible to compensate for temperature variations measured at the input of the filter.
- Such compensation is implemented by determining a difference between a measured average temperature and a set temperature.
- This difference then makes it possible to correct the average flow rate DO of late fuel post-injection in each combustion chamber, by playing on the control signal 65.
- the management unit calculates a positive or negative amount of late post-injection flow to be added to the basic setting OD.
- the management unit uses a set of temperature measurements at the input of the filter.
- such a method offers the advantage of ensuring good regeneration efficiency of the particulate filter, regardless of the temperature dispersions, for example related to the dispersion of the conversion rate of the catalyst.
- the compensation of the dispersions is implemented during the regeneration phase of the particulate filter but only in the case where one is in the presence of favorable rolling conditions.
- favorable running conditions are understood to mean the combined achievement of the following criteria: the temperature measured at the inlet of the particle filter is within a range of predefined values, parameters such as the speed of the vehicle, the engine speed and engine load are within predefined ranges and vary in a limited way in the range in question for a predetermined period of time.
- the speed must be greater than 50km / h and the engine block speed (10) between 1500 and
- variation of said parameters must preferably be less than + - 20% for at least 200 seconds.
- the compensation step according to the invention can be activated. But it is also necessary that for 200 seconds at least, the vehicle maintains a steady speed, that is to say between 80 and 120km / h.
- the management unit continuously implements this test step.
- the management unit continuously monitors the driving conditions and, in the event that one of them becomes unfavorable, deactivates.
- the present invention is not limited to the embodiment described above and shown in the drawings.
- the favorable driving conditions comprise other parameters (for example the gearbox ratio, etc.).
- the method is capable of compensating a dispersion linked to the turbo-compressor (20), to a flow-meter of air and / or to a supercharging sensor of one of the intake manifolds (11). .
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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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0413263A FR2879252A1 (fr) | 2004-12-14 | 2004-12-14 | Procede de commande moteur permettant d'optimiser la regeneration d'un filtre a particules |
FR0413263 | 2004-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006064155A1 true WO2006064155A1 (fr) | 2006-06-22 |
Family
ID=34955554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2005/051068 WO2006064155A1 (fr) | 2004-12-14 | 2005-12-12 | Procede d'optimisation de la regeneration d'un filtre a particules et systeme mettant en oeuvre ce procede |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR2879252A1 (fr) |
WO (1) | WO2006064155A1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4719751A (en) * | 1984-03-31 | 1988-01-19 | Mitsubishi Jidosha Kogyo K.K. | Diesel particulate oxidizer regeneration system |
DE10033159A1 (de) * | 2000-07-07 | 2002-01-17 | Daimler Chrysler Ag | Brennkraftmaschine, insbesondere für Kraftfahrzeuge |
JP2003083030A (ja) * | 2001-09-07 | 2003-03-19 | Mitsubishi Motors Corp | エンジンの排気浄化装置 |
DE102004024115A1 (de) * | 2003-05-16 | 2004-12-02 | Denso Corp., Kariya | Abgasreinigungssystem einer Brennkraftmaschine |
-
2004
- 2004-12-14 FR FR0413263A patent/FR2879252A1/fr active Pending
-
2005
- 2005-12-12 WO PCT/FR2005/051068 patent/WO2006064155A1/fr not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4719751A (en) * | 1984-03-31 | 1988-01-19 | Mitsubishi Jidosha Kogyo K.K. | Diesel particulate oxidizer regeneration system |
DE10033159A1 (de) * | 2000-07-07 | 2002-01-17 | Daimler Chrysler Ag | Brennkraftmaschine, insbesondere für Kraftfahrzeuge |
JP2003083030A (ja) * | 2001-09-07 | 2003-03-19 | Mitsubishi Motors Corp | エンジンの排気浄化装置 |
DE102004024115A1 (de) * | 2003-05-16 | 2004-12-02 | Denso Corp., Kariya | Abgasreinigungssystem einer Brennkraftmaschine |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 07 3 July 2003 (2003-07-03) * |
Also Published As
Publication number | Publication date |
---|---|
FR2879252A1 (fr) | 2006-06-16 |
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