FR2899932A1 - Method and device for controlling the regeneration of a depollution system - Google Patents

Method and device for controlling the regeneration of a depollution system Download PDF

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Publication number
FR2899932A1
FR2899932A1 FR0651361A FR0651361A FR2899932A1 FR 2899932 A1 FR2899932 A1 FR 2899932A1 FR 0651361 A FR0651361 A FR 0651361A FR 0651361 A FR0651361 A FR 0651361A FR 2899932 A1 FR2899932 A1 FR 2899932A1
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France
Prior art keywords
control
temperature
fuel
exhaust line
engine
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Pending
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FR0651361A
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French (fr)
Inventor
Jean Marc Duclos
Frederic Lippens
Chahdi Mohammed Ouazzani
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Renault SAS
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Renault SAS
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Priority to FR0651361A priority Critical patent/FR2899932A1/en
Publication of FR2899932A1 publication Critical patent/FR2899932A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/021Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027Introducing 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
    • F02D41/029Introducing 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/009Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/009Exhaust 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
    • F01N13/0093Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/023Exhaust 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
    • F01N3/025Exhaust 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
    • F01N3/0253Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828Exhaust 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
    • F01N3/0842Nitrogen oxides
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/24Exhaust 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
    • F01N3/36Arrangements for supply of additional fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00Electrical control of exhaust gas treating apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00Electrical control of exhaust gas treating apparatus
    • F01N9/002Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00Electrical control of exhaust gas treating apparatus
    • F01N9/005Electrical 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • F02D41/40Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402Multiple injections
    • F02D41/405Multiple injections with post injections
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00Combinations of different methods of purification
    • F01N2250/02Combinations of different methods of purification filtering and catalytic conversion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00Combinations of different methods of purification
    • F01N2250/12Combinations of different methods of purification absorption or adsorption, and catalytic conversion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2430/00Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/08Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/03Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06Parameters used for exhaust control or diagnosing
    • F01N2900/16Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1602Temperature of exhaust gas apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2200/00Input parameters for engine control
    • F02D2200/02Input parameters for engine control the parameters being related to the engine
    • F02D2200/021Engine temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/021Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024Introducing 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
    • F02D41/025Introducing 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/021Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027Introducing 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
    • F02D41/0275Introducing 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
    • F02D41/028Desulfurisation of NOx traps or adsorbent
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1445Introducing 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446Introducing 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/18Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/182Circuit arrangements for generating control signals by measuring intake air flow for the control of a fuel injection device
    • Y02T10/44
    • Y02T10/47

Abstract

A method of controlling the regeneration of a pollution control system (8), based on the introduction of fuel into the exhaust gas by delayed fuel injection into certain combustion chambers of the engine and / or by direct injection into the engine exhaust line upstream of the filter, as a function of the inlet temperature of the system, characterized in that the fuel flow (Qred) introduced is assigned to direct injection into the exhaust line and / or to the injections in the combustion chambers according to the value of the wall temperature (Tparoi) of the exhaust line.

Description

METHOD AND CONTROL DEVICE FOR REGENERATING A SYSTEM OF

  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 particulate filters or FAP. It applies not only to any vehicle equipped with a particulate filter, but also in the case of the use of an additional injector for purging strategies of a nitrogen oxide trap (NOxTrap). ), or its desulfation. In contrast to a traditional oxidation catalyst, these systems operate discontinuously or alternatively, that is, in normal operation they trap the pollutants, to treat them only during regeneration phases. To be regenerated, these filters, or traps, require specific combustion modes, in order to guarantee the necessary thermal and / or richness levels. To regenerate the particulate filters, it is possible to carry out one or more delayed injections in the combustion chambers of the engine, after the top dead center (WFH), during the expansion phase, these injections having the effect of increasing the temperature exhaust gases. Gasoil injected long after the FMH, does not burn in the combustion chamber, but in the catalytic part of the exhaust line. In order to reduce the polluting emissions, it is possible to have in addition to the FAP, either an oxidation catalyst (DOC) in the exhaust line, upstream of the FAP, or directly a catalytic material (such as platinum ) within the FAP. It is on these catalytic sites that HC and CO late injections oxidize, increasing the temperature of the gases.

  Finally, by increasing the flow rate of a remote post injection, it causes high emissions of HC and CO at the output of the engine. These reducing agents react in the oxidation catalyst with the oxygen present in the exhaust gas, producing heat, which contributes to increasing the temperature of the exhaust gas at the inlet of the particulate filter. Thus, 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 the injection parameters during this phase. However, to improve the efficiency of the regeneration, it is necessary to produce a temperature internal to the filter, favorable to the oxidation of soot (570-650 C), higher than the normal temperature of the exhaust, and that whatever the point of operation of the engine. Similarly, to optimize the treatment of all pollutants, it is necessary to best manage the storage and regeneration phases of these traps. These operations therefore require controlling the inlet temperature of the particulate filter, at the time of the regeneration phases, and the dilution due to the post injection. Currently, the heat required for the regeneration of the particle storage elements, is generated by means of additional injections, either during the relaxation phase of the cylinder, or 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 Tsooc by means of a PI D (Proportional, Integrator, Dérivateur), 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 use of a post-injection into the cylinder creates a significant extra cost in terms of dilution, while the use of direct injection in the exhaust, can allow to ease the development of the system on this aspect. 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 post-injection, in order to limit the dilution cost associated with the use of the filter. post-injection. For this purpose, it proposes that 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. Preferably, 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 injected fuel would not be completely oxidized in it. 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 pollution control system, the pollution control system, and a means of determining the wall temperature of the exhaust line. Other features and advantages of the invention will become clear from reading the following description of a non-limiting embodiment thereof, with reference to the drawings, in which: FIG. 1 shows an example FIG. 2 shows the distribution of the injections as a function of the exhaust conditions, FIG. 3 shows the method of determining the wall temperature, FIG. 4 is a block diagram. FIG. of the control, and Figure 5, shows saturation patterns of the amount of fuel injected into the exhaust line (fifth injector), for three wall temperatures.

  Figure 1 illustrates in a non-limiting manner the application of the invention to a vehicle engine. It has appeared a four-cylinder engine 1, the turbine 2 and the compressor 3 of a turbocharger, and an EGR loop and its cooler 4. In the exhaust line, there is an oxidation catalyst 7 (DOC), followed by a particulate filter 8 (FAP). 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 (Tayt) 11, a particulate filter inlet temperature sensor. (Tefap) 13, a particle filter output temperature sensor (Tesfap) 14, an oxygen sensor 16, and a differential pressure sensor 17, or relative pressure sensor, between the upstream of the filter and the 'atmosphere. Finally, the diagram mentions the throttle valve of the engine 8, the EGR valve 19, and the means for isolating the exhaust line 21. The associated engine control unit 22 receives and processes the signals emitted by the sensors mentioned. , as well as other information from electrical consumers 23, motorcycle fan assembly 25, a controlled thermostat 26, and temperature and atmospheric pressure sensors 27, 28. Within the scope of the invention, the additional injector positioned in the exhaust line, or fifth injector 9, may however be placed, either upstream or downstream of the turbine, without this location has an impact on the proposed strategy. The device concerned by the invention therefore comprises the following elements: an injector with the exhaust 9, a first temperature sensor 11 upstream of the turbine, an oxidation catalyst 8, a second temperature sensor 12 measuring the temperature Tefap at the inlet of a decontamination system, the depollution system 8, and a wall temperature determination means Tparoi, the exhaust line. According to the invention, the wall temperature means may be a calculation model integrated in the computer, or a wall temperature sensor (not shown). Finally, the pollution control system 8 can be either a particulate filter or another system such as an oxide trap of nitrogen, and the exhaust nozzle 9 can be positioned upstream or downstream, of laturbine. As indicated above, the invention provides for distributing the quantity of Qred fuel, making it possible to reach the desired temperature at the inlet of the particle filter, between an additional injector implanted in the exhaust gas passage, and the post-inj ect ion. Specifically, the quantity of Qred reducers controlled by the particulate filter inlet temperature control strategy will be allocated to the additional injector, Q5inj, in the first place and / or Qpoi post injection, depending on the instantaneous value of the wall temperature Tparoi, of the exhaust line.

  The invention assumes that the exhaust nozzle 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 reasons, it may also be preferable not to use the exhaust injector in areas characterized by a high exhaust gas flow rate and a high wall temperature, due to the residence time of the reducers in the oxidation catalyst too low, to allow oxidation of all reductants. In accordance with FIG. 2, 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 motor. The temperature of the wall can be determined either by a sensor or by a model integrated in the engine computer, according to various parameters. In order to determine the temperature of the wall wall, it is indeed possible to use a sensor or a calculation model, integrated for example in the engine control computer, which makes it possible to give an instantaneous value of the partition. This temperature is a function of the different parameters mentioned in Figure 3, including the exhaust gas temperature before the turbine of a Tay turbocharger, the water temperature of the engine water, the flow of the Qech exhaust , and Qair airflow (measured for example at admission). The model can use all or only some of these parameters depending on the engine operating point. The amount of fuel to be injected depends on the wall temperature, DOC outlet oxidation temperature, or the Tefap FAP inlet temperature, and the engine operating point (exhaust gas flow). . The quantity of Qred fuel 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), mapped by operating point speed / engine torque, and a correction generated by a PI D type corrector (Proportional Integrator Derived) dependent on the deviation of the input temperature measurement of the particulate filter at the set temperature Tons. 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. To take account of this constraint, the invention provides that the flow of fuel QSinj injected into the exhaust line is limited to a maximum flow Qinjmax, beyond which the fuel injected would not be completely oxidized therein. Rus precisely, the fuel is injected as a priority in the exhaust line, as long as the injected flow Qin; is less than the maximum flow rate fully oxidizable therein. FIG. 5 illustrates the principle of high flow saturation of the fifth injector, for different wall temperatures Tparoil, Tparoi2, Tparoil. In both areas where this injector can not be used, post-injection will be allowed, if the temperature control strategy at the input of the FAP requires the production of an exotherme in the DOC. 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 controlled on the post-injection: - if Qred <QSinj maxi, then QSinj = Qred and Qpoil = 0 if Qred = Q5inj max, then QSinj = QSinj max and Qpoi1 = Qred - Q5inj max Thus, the fuel surplus Qpoi with respect to the oxidizable flow in the Qinimax exhaust line, is introduced by delayed injections in the chambers engine combustion. Preferably, the computer 22 of the engine controls the fuel flow Qred 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 filter 8 on delayed fuel injections into the combustion chambers of the engine.

  In the case of simultaneous activation of the exhaust injection and the post injection, it is preferable that all the injected fuel follow a progression ramp, to reach the setpoint, so as to avoid part of the injected fuel passes through the catalyst without reacting. With such an injection nozzle, the reducing agents passing through the catalyst, in the event of high exhaust gas flow and high wall temperature, are more likely to oxidize. 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 amount of fuel to be injected (Qred) for the operating point under consideration, based on a map. • the temperature measurement at the output of the DOC (or at the inlet of the FAP) makes it possible to correct this quantity of gearbox, in order to get as close as possible to the desired temperature (setpoint temperature) in contact with the FAP (Tsooc = TEFAP) The control then manages the distribution of the additional fuel between the fifth injector (Q5inj) and the post injection (Qpoi1) according to the characteristics of the exhaust gases (Tparoi and QECH). It is possible that only the fifth injector, or only late injection works. Finally, it should be noted that 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.

Claims (19)

  1. A method of controlling the regeneration of a pollution control system (8), based on the introduction of fuel into the exhaust gas by delayed fuel injection into some combustion chambers of the engine and / or by direct injections in the exhaust line upstream of the filter, depending on the inlet temperature of the system, characterized in that the fuel flow (Qred) introduced is assigned to direct injections into the exhaust line and / or delayed injections in the combustion chambers according to the value of the wall temperature (Tparoi) of the exhaust line.
  2. Control method according to claim 1, characterized in that the fuel injection in the exhaust line is used only in certain operating ranges of the engine.
  3. Control method according to claim 1, characterized in that the injection of fuel into the exhaust line is limited to a zone of the f easible loads and a zone of the most f ort loads of the engine.
  4. Control method according to claim 1, 2 or 3, characterized in that the empér ur ur ur of the wall is determined by a sensor.
  5. Control method according to claim 1, 2 or 3, characterized in that the wall temperature (Tparoi) is determined by a model integrated in the engine computer, according to parameters including the temperature of the exhaust gas before Turbocharger turbine (Tayt), water temperature (water), exhaust gas flow (Qech), and airflow (Qair).
  6. Control method according to one of the preceding claims, characterized in that the fuel flow (Qin;) injected into the exhaust line -11 - is limited to a maximum flow (Qinjmax) beyond which, the fuel injected would not be completely oxidized in it.
  7. A method of control according to one of the preceding claims, characterized in that the fuel is injected in priority in the exhaust line as the injected flow (Qinj) is less than the maximum flow completely oxidized in it (Qinjmax) .
  8. Control method according to claim 7, characterized in that the surplus fuel (Qpoi) relative to the oxidizable flow in the exhaust line (Qinjmax) is introduced by delayed injections into the combustion chambers of the engine.
  9. Control method according to one of the preceding claims, characterized in that the total fuel flow (Qred) is corrected on each operating point of the engine by a factor depending on the difference between the inlet temperature of the filter to particle (Tefap) and the regeneration target temperature (Tons).
  10. Control method according to one of the preceding claims, characterized in that the computer (22) of the engine controls the fuel flow (Qred) in dedicated injector of the exhaust line (9) to a level of saturation of an oxidation catalyst (7), before transferring the surplus controlled by the regeneration of the filter (8) to delayed fuel injections into the combustion chambers of the engine.
  11. Control method according to one of the preceding claims, characterized in that the pollution control system (8) is a particulate filter
  12. Device for controlling the regeneration of a pollution control system (8) disposed in the exhaust line of an engine according to a method according to one of the preceding claims, characterized in that it comprises a jet injector. the exhaust (9), a first temperature sensor (11) upstream of the turbine, an oxidation catalyst (8), a second temperature sensor (12) measuring the temperature (Tefap) at the inlet of a depollution system, the pollution control system (8), and a wall temperature determination means (Tparo;) of the exhaust line.
  13. Control device according to claim 12, characterized in that the wall temperature means is a calculation model integrated in a computer (22).
  14. Control device according to claim 12 or 13, characterized in that the fuel injector (9) is arranged upstream of a turbo compressor turbine (2). 10
  15. Control device according to claim 12 or 13, characterized in that the fuel injector (9) is disposed downstream of a turbo compressor turbine (2).
  16. Control device according to one of claims 12 to 15, characterized in that the first temperature sensor (11) is disposed upstream of a turbo compressor turbine (2).
  17. Control device according to one of claims 12 to 16, characterized in that it comprises a fourth temperature sensor (14) at the output of the pollution control system (Tsfap).
  18. Control device according to one of claims 12 to 16, characterized in that the pollution control system (8) is a particulate filter.
  19. Control device according to one of claims 12 to 16, characterized in that the pollution control system (8) is a trap nitrogen oxides.
FR0651361A 2006-04-14 2006-04-14 Method and device for controlling the regeneration of a depollution system Pending FR2899932A1 (en)

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FR0651361A FR2899932A1 (en) 2006-04-14 2006-04-14 Method and device for controlling the regeneration of a depollution system

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FR0651361A FR2899932A1 (en) 2006-04-14 2006-04-14 Method and device for controlling the regeneration of a depollution system
EP07731851A EP2007976A1 (en) 2006-04-14 2007-03-30 Method and device for monitoring the regeneration of a pollution-removal system
RU2008144967/06A RU2435043C2 (en) 2006-04-14 2007-03-30 Renovation control method for cleaning system, and device for its implementation
PCT/FR2007/051047 WO2007119015A1 (en) 2006-04-14 2007-03-30 Method and device for monitoring the regeneration of a pollution-removal system
US12/297,005 US20100132334A1 (en) 2006-04-14 2007-03-30 Method and device for monitoring the regeneration of a pollution-removal system
CN2007800176007A CN101443534B (en) 2006-04-14 2007-03-30 Method and device for monitoring the regeneration of a pollution-removal system
JP2009504788A JP2009533597A (en) 2006-04-14 2007-03-30 Method and apparatus for monitoring regeneration of a pollution control system

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EP (1) EP2007976A1 (en)
JP (1) JP2009533597A (en)
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