Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N9/00—Electrical control of exhaust gas treating apparatus
  • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
  • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
  • F01N11/005—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus the temperature or pressure being estimated, e.g. by means of a theoretical model
• • 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
  • 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
  • F02D41/1448—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 an exhaust gas pressure
• • 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
  • F01N2900/04—Methods of control or diagnosing
  • F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D2200/00—Input parameters for engine control
  • F02D2200/02—Input parameters for engine control the parameters being related to the engine
  • F02D2200/08—Exhaust gas treatment apparatus parameters
  • F02D2200/0812—Particle filter loading
• • 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
  • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
  • F02D2200/703—Atmospheric pressure
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
  • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/40—Engine management systems

Definitions

• the present invention relates to a system for evaluating the state of charge of depollution means. More particularly, the invention relates to such a system wherein the pollution control means are integrated in an exhaust line of a motor vehicle mo ⁇ tor.
• Such an engine may be associated with common rail fuel supply means of the cylinders thereof, according to at least one post-injection.
• Such a post-injection is, in a conventional manner, an injection of carbu ⁇ rant after top dead center of the cylinder considered.
• These power supply means are adapted to implement, at iso ⁇ torque, by modifying engine operating control parameters, different regeneration strategies to obtain different thermal levels in the exhaust line.
• feeding means implementing regeneration strategies called normal, level 1, level 2 and / or ni ⁇ calf 2 overcalibrated have already been proposed.
• depol ⁇ lution means such as a particulate filter
• the soot trapped in it is burned thanks to the heat supplied by the engine and the exotherm produced by the combus ⁇ tion HC and CO on oxidation catalyst means, placed for example upstream of the particulate filter.
• This combustion can be assisted by a catalyst element melan ⁇ with soot, resulting for example from a regeneration aid additive, mixed with the engine feed fuel or by a catalyst deposited directly on the walls of the filter to particles (catalyzed particle filter).
• the state of charge of the depollution means must be eva ⁇ read as reliably as possible, for reasons of safety func ⁇ tioning thereof and the engine, and to optimize the triggering of regeneration.
• the object of the invention is therefore to propose such a system.
• the subject of the invention is a system for evaluating the state of charge of depollution means integrated in an exhaust line of a motor vehicle engine, characterized in that it comprises means for determining a pressure at the level of the depollution means, means for determining the volume flow rate of the gases upstream of these depol ⁇ lution means and means for comparing the state point of the depollution means, defined by the pressure and the volume flow thus determined, a prede terminated abacus of states absent, overloaded and clogged means of pollution control, to evaluate the state thereof.
• the pressure is an absolute pressure upstream of the depol ⁇ lution means and the volume flow rate upstream of the depollution means is determined according to the following relationship:
• Q VOI (R * (AT2 + 273.15) / P4 * Air mass flow rate) in which Q VO ⁇ represents the flow rate, R is a constant,
• AT2 represents the temperature of the gases upstream of the pollution control means
• P4 is the absolute pressure of the gases delivered by an absolute pressure sensor at the inlet of the pollution control means
• air mass flow rate is the flow rate of the gases passing through the depollution means.
• the states of the depollution means are defined by absentee state, overloaded state and clogged state curves, the state curve of which is absent from the depollution means is multiplied by an altimetric correction coefficient as a function of the atmospheric pressure
• the comparison means comprise means for comparing the volume flow rate determined with a low volume flow rate threshold value to allow the determination of the state of the depollution means only if the determined volume flow rate is greater than the value. low threshold; the comparison means comprise means for validating the state if the latter is maintained for a period of time greater than a predetermined period of confirmation time;
• the depollution means comprise a particulate filter
• the particulate filter is catalyzed;
• the depollution means comprise a NOx trap;
• the fuel comprises an additive intended to be deposited with parti ⁇ cules to which it is mixed, on the means of depollution to facilitate their regeneration;
• the depollution means are impregnated with an SCR formulation, ensuring a CO / HC oxidation function
• the fuel comprises an additive forming a NOx trap
• the engine is associated with a turbocharger.
• FIG. 1 represents a block diagram illustrating the general structure and operation of an engine equipped with depollution means
• FIG. 2 represents a block diagram illustrating the general structure and operation of an evaluation system according to the invention
• FIG. 3 represents a predetermined abacus of states of the depollution means
• FIGS. 4 and 5 illustrate two alternative embodiments of means for determining the volume flow rate of the gases upstream of the depollution means.
• the engine may for example be a diesel engine of an auto-mobile vehicle, the pollution control means comprising for example a particulate filter or others, associated with oxidation catalyst means or the like, as already known in the state of the art.
• This engine is associated with common rail fuel supply means, designated by the general reference 4 in this figure, adapted to implement, under the control of for example a calculator designated by the general reference 5, strategies regeneration of the depollution means by using post-injections of fuel in the engine cylinders.
• This calculator also comprises means for evaluating the state of charge of the depollution means.
• this calculator includes means for determining the differential pressure at the terminals of the depollution means, or the absolute pressure upstream of the pollution control means, designated by the general reference 7 in this figure 2 and means for determining the volume flow rate of the gases upstream of these depol ⁇ lution means, these means being designated by the general reference 8.
• the calculator comprises means for defining a state point of the depollution means from this volume flow rate and this differential pres ⁇ tion, designated by the general reference 9 and means 10 for comparing the state point and defined means of pollution control, to a predetermined abacus state of absence, overloaded or clogged with these depollution means, this abacus being for example stored in storage means designated by the general reference 11.
• the density determination means 8 receive as input the temperature of the gases upstream of the particulate filter, from a sensor designated by the general reference 12 on this figure, the differential pressure from a sensor designated by the general reference 13, the atmospheric pressure measured from a sensor designated by the general reference 14 and a gas mass flow rate information passing through these means of decontamination, from corresponding determination means designated by general reference 15.
• volume flow is calculated according to the following relation:
• Qv o i (R * (AT2 + 273.15) / ( ⁇ P + P atmo) * Air mass flow rate) in which Q VO ⁇ represents the volume flow rate, R is a constant, AT2 is the temperature of the gases upstream of the means of depollution, ⁇ P is the differential pressure at the terminals of the pollution control means, Patmo is the atmospheric pres ⁇ sion and air mass flow rate is the flow of gas passing through the means of depollution.
• an absolute pressure sensor upstream of the depollution means can also be envisaged.
• the density determination means 8 then receive, at the inlet, the temperature of the gases upstream of the particulate filter from the sensor 12, the mass flow rate. of air passing through the means of decontamination from the means of determination 15, and the absolute pressure of the gases at the inlet of the depollution means from a corresponding sensor designated by the general reference 16.
• the determining means 8 can determine the volumetric flow rate by the following relation:
• Q vo i (R * (AT2 + 273.15) / P4 * Air mass flow rate) in which Q VO ⁇ represents the volume flow rate, R is a constant, AT2 is the gas temperature upstream of the particulate filter, P4 is the absolute pressure at the inlet of the pollution control means and air mass flow rate is the flow rate of the gases passing through the depollution means.
• the abacus then has three curves, respectively C Absent, C Overloaded, C Plugged, which respectively enable the presence or the absence of the depollution means, a clogged state of the pollution control means making it possible to ensure the protection of the engine and an overloaded state of the depollution means securing the charge indicator coming for example from other charge determination modules of these depollution means in case of drift thereof and thus ensuring the protection of the depollution means vis-à-vis too critical regeneration temperatures.
• the determination of the state of charge can of course be subject to a condition of maintaining this state during a predetermined state confirmation time.
• the state of the depollution means must of course be memorized at each power failure of the computer 5.
• the Absent C curve can for example be multiplied by an altimetric correction coefficient as a function of the atmospheric pressure.
• the detection of the different states can also be subjected to a comparison of the volume flow rate determined with a low threshold value of volume flow, this threshold being for example calibratable.
• the comparison means 10 can also be adapted to compare the determined volume flow rate with this low limit threshold value ca ⁇ librable, to allow the determination of the state of the pollution control means only if the determined volume flow is higher at the low threshold value. Additional conditions may also be set for detecting the absence of the depollution means.
• the learning phase of the offset of the latter must be completed, the rate of the post-injections must be zero for a predetermined minimum duration and that a time counter allows the detection of such a state.
• the Absent C curve can be obtained by characterization on a motor bed of a catalyst + FAP assembly in the absence of FAP.
• the curve is then constructed by taking the different values of ⁇ P according to Q vol.
• Curve C overloaded can be, for example, a trans ⁇ position of the C-shaped curve.
• depollution means may be provided.
• the depollution means and the oxidation catalyst means may be integrated into one and the same element, in particular on the same substrate.
• a particulate filter incorporating the oxidation function can be envisaged.
• depollution means may also be impregnated with a SCR formulation providing a CO / HC oxidation function in a conventional manner.
• NOx trap incorporating an oxidation function can also be envisaged, whether or not it is additive.
• This oxidation function and / or NOx trap can be filled for example by an additive mixed with the fuel.
• the fuel may in fact comprise an additive intended to be deposited with the particles to which it is mixed on the means of pollution, to facilitate their regeneration.
• the engine may or may not be associated with a turbocharger.

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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)
• Exhaust Gas After Treatment (AREA)
• Processes For Solid Components From Exhaust (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

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• 2004
  • 2004-06-23 FR FR0406865A patent/FR2872212B1/fr not_active Expired - Fee Related
• 2005
  • 2005-06-22 US US11/571,260 patent/US7824481B2/en not_active Expired - Fee Related
  • 2005-06-22 EP EP05781810A patent/EP1766213A1/de not_active Withdrawn
  • 2005-06-22 WO PCT/FR2005/050477 patent/WO2006005875A1/fr not_active Application Discontinuation

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