EP2007976A1 - Procede et dispositif de controle de la regeneration d'un systeme de depollution - Google Patents

Procede et dispositif de controle de la regeneration d'un systeme de depollution

Info

Publication number
EP2007976A1
EP2007976A1 EP07731851A EP07731851A EP2007976A1 EP 2007976 A1 EP2007976 A1 EP 2007976A1 EP 07731851 A EP07731851 A EP 07731851A EP 07731851 A EP07731851 A EP 07731851A EP 2007976 A1 EP2007976 A1 EP 2007976A1
Authority
EP
European Patent Office
Prior art keywords
fuel
temperature
engine
exhaust
exhaust line
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Withdrawn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
EP07731851A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Marc Duclos
Frédéric LIPPENS
Mohammed Ouazzani-Chahdi
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP2007976A1 publication Critical patent/EP2007976A1/fr
Withdrawn legal-status Critical Current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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N3/10—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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/12—Combinations of different methods of purification absorption or adsorption, and catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1602—Temperature of exhaust gas apparatus
    • 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
    • F02D2200/021—Engine temperature
    • 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
    • F02D41/025—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 by changing the composition of the exhaust gas, e.g. for exothermic reaction on 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
    • F02D41/02—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
    • F02D41/0275—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 NOx trap or adsorbent
    • F02D41/028—Desulfurisation of NOx traps or adsorbent
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1445—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being related to the exhaust flow
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • 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
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/182—Circuit arrangements for generating control signals by measuring intake air flow for the control of a fuel injection device
    • 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 is in the field of internal combustion engines and more particularly diesel type engines, since they reject particles. Indeed, this invention relates in particular to the management of f ilt res except icules or FAP.
  • NOxTrap nitrogen oxide trap
  • these systems operate discontinuously or alternatively, that is, in normal operation they trap the pollutants, to treat them only during regeneration phases.
  • these filters, or traps require specific combustion modes, in order to guarantee the necessary thermal and / or richness levels.
  • the regeneration of a particulate filter can use the heat produced by an oxidation catalyst generally placed upstream of the particulate filter, and that of the catalytic phase which is coated with the catalytic particle filter.
  • the latter performs the oxidation function of hydrocarbons and carbon monoxide untreated by the oxidation catalyst. It can also use the heat produced by the oxidation phase of the catalytic particle filter, when there is no oxidation catalyst upstream thereof.
  • the activation of the various regeneration aid means is generally controlled by the engine control computer, which determines, as a function of several parameters, including the soot loading of the particulate filter, the instant of the regeneration, as well as its duration and injection parameters during this phase.
  • the heat required for the regeneration of the particle storage elements is generated by means of additional injections, either during the expansion phase of the cylinder, either directly in the exhaust line.
  • the adjustment of the injection is generally carried out by a loop on the temperature at the outlet of the oxidation catalyst T SD ocau by a Pl D (Proportional, Integrator, Derivator), which applies a correction calculated to regulate this temperature .
  • the two actuators available to achieve the expected exotherm in the catalytic phase of the exhaust line, are not equal before the fuel dilution criterion in the lubricating oil.
  • the object of the present invention is to maximize the regeneration performance of the particulate filter, by favoring the injection of reducers into the exhaust line at the post-injection, in order to limit the dilution cost associated with the use of the post-injection.
  • the fuel flow introduced be assigned to direct injections into the exhaust line and / or delayed injections in the combustion chambers, depending on the value of the wall temperature.
  • the injection of fuel into the exhaust line is limited to a zone of the lowest loads, and to a zone of the highest loads of the engine, and the fuel flow injected into the exhaust line is limited to a maximum flow, beyond which the fuel injected would not be completely oxidized therein.
  • the invention also proposes a device comprising a first temperature sensor upstream of the turbine, an oxidation catalyst, a second temperature sensor measuring the inlet temperature of a heating system. depollution, the pollution control system, and means for determining the wall temperature of the exhaust line.
  • FIG. 1 shows an example of application of the invention
  • FIG. 2 shows the distribution of the injections as a function of exhaust conditions
  • FIG. 3 presents the method for determining the wall temperature
  • FIG. 4 is a block diagram of the command
  • FIG. 5 shows saturation traces of the quantity of fuel injected into the exhaust line (fifth injector) for three times per hour.
  • Figure 1 illustrates in a non-limiting manner the application of the invention to a vehicle engine. It reveals a four-cylinder engine 1, the turbine 2 and the compressor 3 of a turbocharger, as well as an EGR loop and its cooler 4.
  • DOC oxidation catalyst 7
  • FAP particulate filter 8
  • An exhaust fuel injector 9, called the fifth injector is placed upstream of the catalyst 7.
  • the various associated sensors are a front turbine temperature sensor (T avt ) 11, a filter inlet temperature sensor.
  • the additional inj ector positioned in the exhaust line, or fifth inj ector 9, can however be placed, either upstream or downstream of the turbine, without this location having any incidence. on the proposed strategy.
  • the device concerned by the invention therefore comprises the following elements: an injector at the exhaust 9, a first temperature sensor 11 upstream of the turbine, an oxidation catalyst 8, a second temperature sensor 12 measuring the temperature
  • the wall temperature means may be a calculation model integrated in the computer, or a wall temperature sensor (not shown).
  • the pollution control system 8 may be either a particulate filter or another system such as a nitrogen oxide trap, and the exhaust nozzle 9 may be positioned upstream or downstream. , of the turbine.
  • the invention provides for distributing the quantity of fuel Q re d, making it possible to reach the desired temperature at the inlet of the particle filter, between an additional injector implanted in the passage of the exhaust gases, and the post-injection.
  • the quantity of gear reducers Q red controlled by the input filter temperature control strategy of the particulate filter will be assigned to the additional injector, Q 5 ,,,, first and / or to the post injection Q p0 , , according to the instantaneous value of the temperature of the wall T par0 ⁇ , of the exhaust line.
  • the invention assumes that the exhaust injector can not be used over the entire operating range of the engine. Indeed, the area characterized by a low exhaust gas flow rate and a low wall temperature, does not allow a satisfactory vaporization of the fuel injected. For safety, it may also be preferable not to use the exhaust injector in areas characterized by high exhaust gas flow and high wall temperature, due to the residence time of the reducers.
  • the injection of fuel into the exhaust line is therefore used only in certain operating ranges of the engine, and limited for example to a zone of the lowest loads, and to a zone of the highest loads of the engine. engine.
  • the wall thickness can be determined either by a sensor or by a model integrated in the engine computer, according to different parameters.
  • a sensor or a calculation model integrated for example in the engine control computer, which makes it possible to give an instantaneous value of T parol .
  • This temperature is a function of various parameters mentioned in FIG. 3, including the temperature of the exhaust gases before the turbine of a turbocharger T avt , the water temperature T water of the engine, the flow of the exhaust gases Q eCh , and Q alr airflow
  • the model can use all or only some of these parameters depending on the engine operating point.
  • the quantity of fuel to be injected Q red depends on the temperature of the wall, the temperature at the outlet of the oxidation catalyst DOC or the inlet temperature of the FAP T efap , and the operating point of the engine. (exhaust gas flow).
  • the quantity of fuel Q re d is calculated by means of a module integrated in the engine control computer. This module, illustrated in FIG. 4, is composed of a basic setting of the injector gearing rate (assumed to be independent of the actuator), mapping by operating point governed by the motor torque, and a correction generated by a corrector of PID type (Proportional Integrator Derivator) dependent on the deviation of the input temperature measurement of the particulate filter at the set temperature T cons .
  • PID type Proportional Integrator Derivator
  • the conversion capacity of the DOC which depends on the temperature of the wall and the flow rate of the gases passing therethrough, defines a maximum flow rate for the fifth injector, beyond which part of the reducers injected into the exhaust will not be oxidized.
  • the invention provides that the flow rate of fuel Q 5mj injected into the exhaust line is limited to a maximum flow Q ⁇ nJ max, beyond which the injected fuel would not be completely oxidized therein .
  • the fuel is injected in priority in the exhaust line, as long as the injected flow rate Q mj is lower than the maximum flow oxidizable completely in it Q lnJ max-
  • FIG. 5 illustrates the principle of high throughput saturation of the fifth injector, for different wall temperatures T parol i, T parol 2,
  • the fifth injector When the use of the fifth injector is allowed, it is saturated first, so as to favor its use until saturation, by postponing the surplus ordered on the post-injection:
  • the excess fuel Q p0 is introduced by delayed injections into the combustion chambers of the engine.
  • the computer 22 of the motor controls the fuel flow Q re d in the dedicated injector of the exhaust line 9, to a saturation level of the oxidation catalyst 7, before transferring the surplus controlled by the regeneration of the filter 8 on delayed fuel injections into the combustion chambers of the engine.
  • the latot ality of the injected fuel follows a progression ramp, to reach the setpoint, so as to avoid that a part injected fuel passes through the catalyst without reacting. With such an injection profile, the reducers passing through the catalyst, in the event of high exhaust gas flow and high wall temperature, are more likely to oxidize.
  • the present invention proposes to vary firstly the flow rate of the injector to the exhaust in response to a variation of the overall flow rate.
  • the post - injection is insensitive to the variation of the set point.
  • the invention provides for restoring equilibrium (that is to say, to have the maximum flow of possible reducers to the exhaust and the minimum in the combustion chambers of the engine) by progressively increasing the flow of exhaust reducers.
  • the strategy model of injection of reducers in the exhaust line is integrated into the vehicle ECU.
  • the main steps of the strategy are: • the model first determines an additional quantity of fuel to be injected (Q red ) for the operating point under consideration, based on a map.
  • control then manages the distribution of the additional fuel between the fifth injector (Q 51n ) and the post injection (Q po n) according to the characteristics of the exhaust gases (T parol and Q E C H ) - It is possible that only the fifth injector, or only the late injection, does not work.
  • the accuracy of the wall temperature calculation model may limit the use of the proposed strategy. Indeed, it is important to be able to use the additional injector over the highest possible load speed range, but it is also important not to use it when the wall temperature is too low. The margin taken on the value of the parcel, will directly impact the field regime / load accessible.

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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)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP07731851A 2006-04-14 2007-03-30 Procede et dispositif de controle de la regeneration d'un systeme de depollution Withdrawn EP2007976A1 (fr)

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FR0651361A FR2899932A1 (fr) 2006-04-14 2006-04-14 Procede et dispositif de controle de la regeneration d'un systeme de depollution
PCT/FR2007/051047 WO2007119015A1 (fr) 2006-04-14 2007-03-30 Procede et dispositif de controle de la regeneration d'un systeme de depollution

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FR2899932A1 (fr) 2007-10-19
CN101443534A (zh) 2009-05-27
US20100132334A1 (en) 2010-06-03
RU2435043C2 (ru) 2011-11-27
WO2007119015A1 (fr) 2007-10-25
RU2008144967A (ru) 2010-05-20
CN101443534B (zh) 2011-02-09
JP2009533597A (ja) 2009-09-17

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