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
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
  • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
  • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • 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 filters
• • 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
  • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
  • F02D41/1474—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method by detecting the commutation time of the 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
  • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
  • F01N2430/04—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by adding non-fuel substances to combustion air or fuel, e.g. additives
• • 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
  • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
  • F01N2550/04—Filtering activity of particulate filters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
  • F01N2570/10—Carbon or carbon 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
  • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
  • F01N2570/12—Hydrocarbons
• • 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
• • 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 system for assisting the regeneration of depollution means associated with oxidation catalyst means implementing an OSC function constituting an oxygen reserve, and integrated in an exhaust line of a diesel engine of a motor vehicle.
• the invention relates to such a system wherein the engine is associated with common cylinder fuel supply means thereof.
• the soot trapped in it is burned thanks to the thermal provided by the engine and the exotherm achieved by the conversion of HC and CO on the means. forming oxidation catalyst placed upstream of the particulate filter.
• This combustion can be assisted by a catalyst element mixed 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 particulate filter ( catalyzed particulate filter).
• the diesel engine emits a large amount of CO and unburned hydrocarbons in the exhaust gas. Moreover, the amount of oxygen present in these gases is greatly reduced (2 to 3% or even less than 1%).
• the passage of these gases in the oxidation catalyst means allows the combustion of CO and HC by the oxygen present in the gases.
• an OSC Oxygen Storage Capacity
• cerium which stores oxygen in the form of ceria C e ⁇ 2
• a mixed oxide of cerium and zirconium in the means oxidation catalyst
• the combustion of CO and HC is an exothermic reaction and makes it possible to increase the thermal levels at the outlet of the oxidation catalyst, that is to say at the inlet of the particulate filter or within the particulate filter according to the configuration of the exhaust line.
• the rich mode produces a larger quantity of reducing agents and especially CO.
• the exotherm produced by the oxidation catalyst is greater in rich mode than in the poor mode of regeneration of FAP. The transition to rich mode thus allows to further heat the exhaust.
• the aim of the invention is to propose a control of the engine which makes it possible to optimize the chances of success of regeneration attempts, especially in critical conditions.
• the subject of the invention is a system for assisting the regeneration of depollution means associated with means forming an oxidation catalyst implementing an OSC function and integrated into an exhaust line of a diesel engine. of a motor vehicle, in which the engine is associated with means with common rail for supplying cylinders with fuel, characterized in that it comprises means for monitoring the depollution means for controlling the control means of the engine.
• engine according to operating sequences alternating operating phases with rich mixture and lean mixture according to a first sequence strategy successive sequences of this type or a second strategy of sequences of this type separated by a lean operation phase.
• the monitoring means comprise means for monitoring the state of charge of the depollution means in order to trigger the first strategy in the event of exceeding predetermined threshold values of overloaded and clogged charge states of the depollution means; the monitoring means comprise means for monitoring the number of successive incomplete regenerations of the depollution means in order to trigger the first strategy if a predetermined number is exceeded;
• the monitoring means comprise means for monitoring the frequency of the last regenerations of the depollution means in order, in the case where this frequency crosses a predetermined threshold, to trigger the first strategy;
• the monitoring means comprise means for measuring the temperature of the gases upstream of the depollution means and of comparing the latter with a temperature threshold in order to trigger the second strategy in the event of an overshoot and thus making it possible to maintain the temperature of the gas in an optimum window of regeneration;
• 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 the particles to which it is mixed, on the depollution means, to facilitate their regeneration;
• the depollution means are impregnated with a SCR formulation providing a CO / HC oxidation function
• the fuel comprises an additive forming a NOx trap
• FIG. 1 shows a block diagram illustrating the structure and operation of pollution control means integrated in an exhaust line of a motor vehicle diesel engine
• FIGS. 2 and 3 respectively illustrate first and second strategies implemented in a regeneration assistance system according to the invention; and - Figure 4 illustrates the operation thereof.
• FIG. 1 shows depollution means associated with oxidation catalyst means implementing an OSC function, generally designated by the general reference 1 and integrated in an exhaust line 2 of an engine. Diesel 3 of a motor vehicle.
• the oxidation catalyst means implement, for example, an OSC function constituting an oxygen reserve and the depollution means comprise, for example, a particulate filter.
• Such oxidation catalyst means implementing an OSC function are already known in the state of the art.
• the engine is associated with common rail fuel supply means cylinders thereof, designated by the general reference 4, whose operation is controlled by a computer designated by the general reference 5, associated with means 6 of storage of control strategies to ensure the regeneration of the means of depollution.
• means for monitoring the pollution control means for controlling the engine control means according to operating sequences alternating operating phases with rich mixture and lean mixture according to a first strategy of successive sequences of this type or a second strategy of sequences of this type separated by a lean operation phase.
• the first control strategy of the latter comprises successive sequences alternating phases of operation with rich mixture and lean mixture of the engine, for example in aid of the regeneration of level 2, and this loop until the end of the request for regeneration assistance.
• FIG. 2 has in fact shown a first strategy of this type which comprises successive sequences of operation of the engine with rich mixture and lean mixture alternately.
• FIG. 3 a second control strategy is illustrated which comprises alternating operating sequences in rich mixture and in lean mixture, for example of level 2, separated by a lean operation phase, for example also of level 2. This allows then, as can be seen in FIG. 4, to drive the motor to obtain higher or lower thermal levels making it possible to optimize the regeneration of the filter depollution means.
• the number of rich / poor sequences is calibrated and the duration in each phase or mode (poor level 2 and rich) is also calibrable.
• these monitoring means may comprise means for monitoring the state of charge of the depollution means in order to trigger the first strategy if predetermined threshold values of overloaded and clogged charge states are exceeded. means of depollution.
• the monitoring means may also comprise means for monitoring the number of successive incomplete regenerations of the depollution means to engage the first strategy in case of exceeding a predetermined number.
• the monitoring means may also include means for monitoring the frequency of the last regeneration of the depollution means for, in the case where this frequency crosses a predetermined threshold, engage the first strategy.
• the frequency of the last regenerations can be calculated over the last five regenerations of the filter.
• these monitoring means may comprise means for measuring the temperature of the gases upstream of the particulate filter and for comparing it with a temperature threshold in order to trigger the second strategy in case of overshoot and thus make it possible to maintain the temperature of the gases in an optimum regeneration window.
• the transition to a rich operating mode therefore makes it possible to heat the exhaust gases further, which accelerates the regeneration speed of the particulate filter.
• the increase in the thermal levels makes it possible to reduce the dosage of additive and thus to increase the distance traveled by the vehicle before cleaning the filter.
• this additive is indeed present in the particles after combustion of the fuel additive in the engine.
• the depollution means may comprise a particulate filter, catalyzed or not, a NOx trap, etc.
• depollution means may also be impregnated with a SCR formulation providing a CO / HC oxidation function in a conventional manner.
• 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.
• NOx trap integrating such an oxidation function can also be considered, whether it is additive or not.
• This oxidation function and / or NOx trap can be filled for example by an additive mixed with the fuel.
• 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)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
• Exhaust Gas After Treatment (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=34947881

Family Applications (1)

Country Status (3)

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Family Cites Families (3)

• 2004
  • 2004-06-23 FR FR0406857A patent/FR2872205B1/fr not_active Expired - Fee Related
• 2005
  • 2005-06-20 EP EP05778219A patent/EP1766212A1/de not_active Withdrawn
  • 2005-06-20 WO PCT/FR2005/050463 patent/WO2006005866A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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