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
  • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/34—Chemical or biological purification of waste gases
  • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
  • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/34—Chemical or biological purification of waste gases
  • B01D53/46—Removing components of defined structure
  • B01D53/54—Nitrogen compounds
  • B01D53/56—Nitrogen oxides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/34—Chemical or biological purification of waste gases
  • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
  • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
  • B01D53/9495—Controlling the catalytic process
• • 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
• • 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
  • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/08—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
  • F01N3/18—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 methods of operation; Control
  • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion
• • 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
• • 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
  • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
  • F02D41/1441—Plural sensors
• • 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
  • F01N2250/00—Combinations of different methods of purification
  • F01N2250/14—Combinations of different methods of purification absorption or adsorption, and filtering
• • 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
  • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
• • 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
  • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
  • F01N2570/14—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
  • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
  • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
• • 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
  • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filter
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
• • 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
  • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
  • F02D2041/1413—Controller structures or design
  • F02D2041/1432—Controller structures or design the system including a filter, e.g. a low pass or high pass 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
  • F02D41/1454—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 oxygen content or concentration or the air-fuel ratio
• • 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
  • F02D41/1454—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 oxygen content or concentration or the air-fuel ratio
  • F02D41/1456—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 oxygen content or concentration or the air-fuel ratio with sensor output signal being linear or quasi-linear with the concentration of oxygen
• • 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

Definitions

• the present invention relates to a method and a device for managing the operation of a nitrogen oxide trap for a combustion engine operating in a lean mixture.
• a nitrogen oxide trap continuously captures the nitrogen oxides contained in the exhaust gases produced by said engine. It is therefore necessary to regenerate periodically the nitrogen oxide trap to discharge it, which is done by a so-called purge operation, during which the nitrogen oxides are reduced. It is known to perform this purging periodically, temporarily controlling an increase in the richness of the engine, such that the richness of the exhaust gases upstream of the nitrogen oxide trap is greater than 1 and the oxygen concentration low, that is to say that the engine generates reducers, such as HC, CO and H 2 , capable of reducing the nitrogen oxides stored on the substrate of the trap, according to the following reactions:
• the end of the purge can be controlled for example after a predetermined time from the passage of the engine in operation in rich mixture. However, this does not then take into account the actual state of charge of the nitrogen oxide trap, and there is a risk either of having an incomplete purge, or of an unnecessarily long rich mixture operating phase.
• the present invention aims to solve this problem and aims in particular to provide a method and means making it possible to optimally control the stopping of the purges of a catalyst of the nitrogen oxide trap type placed on the line. exhaust from an internal combustion engine normally operating in a lean mixture.
• the subject of the invention is a method for managing the operation of a nitrogen oxide trap for an internal combustion engine operating in a lean mixture, according to which a purge of said trap is periodically controlled. nitrogen oxides.
• this process is characterized in that there is a ⁇ first oxygen sensor on the exhaust duct downstream of the nitrogen oxide trap, and the evolution of a significant signal representative of the signal supplied by this probe, a significant increase in this significant signal from a first plateau of substantially constant level, obtained following a variation following a change in the engine from operation in lean mixture to operation in rich mixture, being used as an indicator to control the end of the purge.
• the command to end purging of the nitrogen oxide trap is therefore carried out in response to a significant change in the significant signal representative of the state of the oxygen sensor placed downstream of the trap, this evolution consisting in a marked increase in the signal beyond a first plateau reached practically from the start of the purge and where the signal had previously been substantially stabilized.
• the inventors have in fact found that, at substantially constant conditions upstream of the nitrogen oxide trap at During the purge, the signal supplied by the oxygen sensor placed downstream of the nitrogen oxide trap was still undergoing a significant evolution at the time when the reduction of all the stored nitrogen oxides was sufficiently complete.
• lambda probes normally provide a practically binary signal depending on the detection or not of oxygen.
• Proportional probes are certainly better able to measure staggered concentrations or gradual variations, but the signal they can provide nevertheless varies suddenly if the evolution of the oxygen content is strong and rapid.
• the gas mixture leaving the nitrogen oxide trap remains without effect on the probe as long as these reactions occur, and it is only at the end of the reduction reactions that the reducers are found. then in excess at the outlet of the nitrogen oxide trap, causing the probe signal to toggle, truly representative then of the end of purging.
• This H 2 formation was measured by gas chromatography and continuous mass spectrometry.
• This change in the concentration of reducing agents downstream of the nitrogen oxide trap influences the signal of the oxygen probes of the all or nothing type, such as the lambda probes, or of the proportional probe type, such as the probes known under the name of UEGO ® probe, which then present a signal in the form of said second tray located at a level higher than the first tray.
• Oxygen sensors of the lambda type and oxygen sensors of the proportional type are particularly sensitive to the hydrogen present in the exhaust gases and show a significant change in their signal when the concentration of H2 in the exhaust gases changes and so when switching from the first to the second tray.
• a second oxygen sensor is used in addition placed upstream of the nitrogen oxide trap, to provide a reference signal by report to which the evolution of the signal provided by the first probe is compared to provide said significant signal.
• This reference signal which can be influenced by variations in the operating conditions of the engine independent of those programmed for the purging operation proper, therefore allows by comparison to reliably detect the significant variation at the end of the reduction reactions in the nitrogen oxide trap.
• oxygen sensors upstream and downstream of the nitrogen oxide trap, for example two lambda sensors or two sensors
• the signal of the upstream lambda probe may be at the same level signal, the downstream lambda probe on the second tray.
• the one or 'probe (s) for oxygen will typically be chosen from the following types of sensors: lambda probe type, proportional probe oxygen, nitrogen oxide sensor which uses the oxygen concentration measurement function.
• the two probes may also be of different types, and in particular it will thus be possible to use for the purposes of the invention of probes possibly already installed on the exhaust line to perform other functions.
• function 02 of the Nox sensor means the use of the oxygen concentration measurement function of a nitrogen oxide sensor, as indicated previously.
• the increase in the significant signal is detected in filtering the first derivative of the significant signal and comparing the filtered first derivative to a predetermined threshold.
• the increase in the significant signal is detected by filtering the second derivative of the significant signal and observing the passage to zero in decreasing threshold of the filtered second derivative.
• the increase in the significant signal is detected by making the difference between the instantaneous value of the significant signal and a sliding average of said signal, and by comparing this difference with a threshold.
• the increase in the significant signal, for a lambda probe is detected by comparing the voltage value delivered by the probe to a predetermined threshold.
• FIG. 1 is a schematic and partial representation of the gas circuit of said engine
• FIG. 2 is a graph showing the representative curves of the signal from different probes placed upstream and downstream of the oxide trap nitrogen, and illustrating the signal variation used as the end of purge indicator.
• FIG. 1 schematically shows the elements of the engine through which the gases pass, and we can see there, successively according to the direction of gas flow:
• a first oxygen probe 21 is mounted downstream of the nitrogen oxide trap, and a second oxygen probe 22 is mounted upstream of the nitrogen oxide trap, the two probes being connected to a computing unit 23, it - even connected to a pilo aye unit of the 24 motor.
• the probes 21 and 22 are for example proportional, or lambda probes.
• the graph in FIG. 2 shows the results of test measurements carried out with different types of probes, as a function of the time from the start of a purge.
• the scale on the left represents the value of the signal supplied by a splitting machine
• the scale on the right represents the quantity of CO downstream of the nitrogen oxide trap (for trace 6) 5
• Line 3 represents the signal supplied by a lambda type probe placed downstream of the nitrogen oxide trap.
• Line 4 represents the signal supplied by a proportional type probe placed downstream of the nitrogen oxide trap.
• trace 5 represents the signal supplied by a proportional type probe placed 0 upstream of the nitrogen oxide trap. It is clear that this signal also undergoes a sudden rise 51, at the time of initiation of the purge, due to the influx of reducers in the exhaust gases. On the other hand, the signal then remains constant on a level 52, as long that the engine is maintained in a constant operating mode in rich mixture. If any disruption of this scheme during purging, 'this disturbance correspondingly affect the upstream probe as the probe located downstream of the trap nitrogen oxides, and this signal provided by the upstream sensor may be a reference to evaluate by comparison the variations in the signal from the downstream probe that are really significant at the end of the purge.
• the level of the plate 42 is located below the plate 52, the difference corresponding to the share of reducers used to reduce the nitrogen oxides stored in the filter.
• the signal from the downstream probe passes over that of the upstream probe, which clearly illustrates the arrival on the probe of the hydrogen formed in the nitrogen oxide trap according to the aforementioned reaction mechanism.
• plot 8 representing the second derivative, the zero crossing of which in decreasing threshold 81 can also be used as signaling information for end of purge.
• the invention is not limited to the examples described above. It is more particularly intended for diesel engines but could also apply in general to all engines operating normally in lean mixture.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Health & Medical Sciences (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Analytical Chemistry (AREA)
• Environmental & Geological Engineering (AREA)
• Biomedical Technology (AREA)
• Toxicology (AREA)
• Exhaust Gas After Treatment (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

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• 2002
  • 2002-07-31 FR FR0209712A patent/FR2843044B1/fr not_active Expired - Fee Related
• 2003
  • 2003-07-30 JP JP2004525500A patent/JP2005534855A/ja active Pending
  • 2003-07-30 AU AU2003281833A patent/AU2003281833A1/en not_active Abandoned
  • 2003-07-30 KR KR1020057001684A patent/KR20050030965A/ko not_active Withdrawn
  • 2003-07-30 US US10/522,724 patent/US20060117738A1/en not_active Abandoned
  • 2003-07-30 WO PCT/FR2003/002421 patent/WO2004012846A2/fr not_active Ceased
  • 2003-07-30 EP EP03756518A patent/EP1525045A2/de not_active Withdrawn
  • 2003-07-30 CA CA002493529A patent/CA2493529A1/en not_active Abandoned

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