Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/021—Introducing corrections for particular conditions exterior to the engine
  • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
  • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
• • 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
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/30—Controlling fuel injection
  • F02D41/38—Controlling fuel injection of the high pressure type
  • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
  • F02D41/402—Multiple injections
  • F02D41/405—Multiple injections with post injections
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • 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
  • F02D41/0002—Controlling intake air
  • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/021—Introducing corrections for particular conditions exterior to the engine
  • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
  • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
• • 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
• • 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 assisting the regeneration of pollution control means integrated in an exhaust line of a diesel engine of a motor vehicle. More particularly, the invention relates to such systems in which the engine is associated with common rail supply means for injecting fuel into the engine cylinders, according to at least one post-injection, and suitable for implementing , at iso-torque, by modifying engine operating control parameters, at least two regeneration strategies of first and second levels, in order to obtain different thermal levels in the exhaust line, the thermal level corresponding to the second level strategy being greater than that corresponding to the first level strategy.
• the object of the invention is to propose a system which makes it possible to further optimize this regeneration.
• the subject of the invention is a system for assisting the regeneration of depollution means integrated in an exhaust line of an engine.
• Motor vehicle diesel in which the engine is associated with common rail supply means for injecting fuel into engine cylinders, according to at least one post-injection, and suitable for implementing, iso-torque , by modifying engine operating control parameters, at least two first and second level regeneration strategies, in order to obtain different thermal levels in the exhaust line, the thermal level corresponding to the second level strategy being greater than that corresponding to the first level strategy, characterized in that it further comprises means for temporarily engaging an overbalanced second level strategy, with iso-torque, to obtain a higher thermal level and therefore accelerate the warming up of the exhaust line and / or the regeneration of the depollution means.
• the depollution means comprise means forming an oxidation catalyst.
• the depollution means include a particle filter.
• the depollution means include a NOx trap.
• the fuel includes an additive intended to be deposited with the particles with which it is mixed, on the depollution means to facilitate their regeneration.
• the engine is associated with a turbocharger.
• these depollution means comprise means forming an oxidation catalyst designated by the general reference 4 placed upstream of a particulate filter designated by the general reference 5 in the exhaust line.
• the engine is in turn associated with means 6 for supplying common rail for injecting fuel into the engine cylinders according to at least one post-injection.
• These supply means are suitable for implementing under the control of control means 7, by modifying parameters for controlling the operation of the engine, and at iso-torque, at least two regeneration strategies of first and second levels such as designated by the references 8 and 9 in this figure. These strategies make it possible to obtain different thermal levels in the exhaust line, the thermal level corresponding to the second level strategy being higher than that obtained by the first level strategy.
• this system also includes means for temporarily engaging an overbalanced second level strategy 10 to obtain, at iso-torque, a higher thermal level and therefore accelerate the warming up of the exhaust line. and / or the regeneration of depollution means.
• interlocking means are formed by the supply means 6 and the control means 7.
• an operating mode of aid type for the regeneration of the level 2 particulate filter is added, making it possible to exceed temporarily the criteria for thermal resistance of certain elements of the engine (exhaust manifold, oxidation catalyst, NOx trap, etc.).
• the objective of this set of parameters is to accelerate the temperature rise of the entire exhaust line, particularly in engine operating conditions where the heating for the desulfation of the NOx trap or the aid for the regeneration of the conventional particle filter does not allow reaching sufficient thermal levels to trigger the regeneration of the particle filter, for example 500 ° C for a filter with additive and 570 ° C for a catalyzed filter, or the desulfation of the NOx trap, for example 625 ° C.
• the additive mentioned above is an additive which can be mixed with the engine supply fuel to deposit with the particles with which it is mixed, on the particle filter in order to favor the triggering of the combustion of soot trapped in it by lowering their combustion temperature.
• this additive is indeed present in the particles after combustion of the additive fuel in the engine.
• the following criteria can be used for a standard calibration to aid in the regeneration of a second level particulate filter:
• such a system makes it possible to accelerate the heating up of all the elements of the exhaust line, that is to say of the oxidation catalyst, of the NOx trap, of the particle filter, etc. by shortening the duration of this regeneration of a particulate filter or the desulfation of a NOx trap, particularly under unfavorable driving conditions such as in town or in traffic jams.
• the means forming an oxidation catalyst and the NOx trap can be integrated into one and the same element, in particular on the same substrate.
• a particle filter integrating the oxidation function can be envisaged.
• a NOx trap incorporating such an oxidation function can also be envisaged, whether this is additive or not.
• This oxidation and / or NOx trap function can be fulfilled, for example, by an additive mixed with the fuel.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Exhaust Gas After Treatment (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34531264

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Family Cites Families (5)

• 2003
  • 2003-11-25 FR FR0313826A patent/FR2862705B1/fr not_active Expired - Fee Related
• 2004
  • 2004-11-09 EP EP04805427A patent/EP1702144A1/de not_active Withdrawn
  • 2004-11-09 WO PCT/FR2004/002884 patent/WO2005064129A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events