Classifications

• • 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
  • F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
• • 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
• • 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
  • F01N3/025—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 using fuel burner or by adding fuel to exhaust
  • F01N3/0253—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 using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
• • 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
  • F01N3/10—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 ; Methods of operation or control of catalytic converters
  • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
• • 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
  • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
• • 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
  • F01N3/24—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 constructional aspects of converting apparatus
  • F01N3/30—Arrangements for supply of additional air
  • F01N3/306—Preheating additional air
• • 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
  • F01N3/24—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 constructional aspects of converting apparatus
  • F01N3/30—Arrangements for supply of additional air
  • F01N3/32—Arrangements for supply of additional air using air pump
  • F01N3/323—Electrically driven air pumps
• • 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
  • F01N3/24—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 constructional aspects of converting apparatus
  • F01N3/30—Arrangements for supply of additional air
  • F01N3/32—Arrangements for supply of additional air using air pump
  • F01N3/326—Engine-driven air pumps
• • 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
  • F02B37/12—Control of the pumps
  • F02B37/16—Control of the pumps by bypassing charging air
  • F02B37/162—Control of the pumps by bypassing charging air by bypassing, e.g. partially, intake air from pump inlet to pump outlet
• • 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
  • F02B37/12—Control of the pumps
  • F02B37/16—Control of the pumps by bypassing charging air
  • F02B37/164—Control of the pumps by bypassing charging air the bypassed air being used in an auxiliary apparatus, e.g. in an air turbine
• • 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
  • F02B37/12—Control of the pumps
  • F02B37/16—Control of the pumps by bypassing charging air
  • F02B37/168—Control of the pumps by bypassing charging air into the exhaust conduit
• • 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
  • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
  • F02B39/02—Drives of pumps; Varying pump drive gear ratio
  • F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
  • F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
• • 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
• • 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
  • F02D41/021—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
  • F02D41/028—Desulfurisation of NOx traps 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
  • F02D41/021—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
  • F02D41/0295—Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/02—EGR systems specially adapted for supercharged engines
  • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
  • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
  • F02M26/02—EGR systems specially adapted for supercharged engines
  • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
  • F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
• • 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
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the present invention relates to a supercharged engine comprising combustion cylinders, an intake gas intake circuit connected to an intake intake of the cylinders and an exhaust system connected to an exhaust outlet of the cylinders, the intake circuit comprising a turbocharger compressor and the exhaust circuit comprising on the one hand a turbocharger turbine rotatably coupled to the turbocharger compressor and connected to the exhaust outlet of the cylinders to be rotated by the gases exhaust system and, on the other hand, an aftertreatment system of the exhaust gas at the outlet of the turbocharger turbine, said intake circuit further comprising an additional compressor having an output connected to a duct of intake gas injection connecting the intake circuit downstream of the additional compressor to the exhaust circuit upstream of the aftertreatment system exhaust gases.
• the additional compressor in this case an electric compressor, which is initially intended to increase the quantity of pressurized air admitted on admission, in particular at low speed, can be used, at least periodically, for send air under pressure directly into the exhaust system upstream of the catalyst via the injection pipe.
• the pressurized air thus supplied by the electric compressor can participate in the heating of the catalyst and accelerates the heating of the catalyst.
• this system does not provide a satisfactory rise in temperature upstream of the post-processing system.
• the engine must have enough air to operate at a value close to 1 or slightly above this value, so that the excess fuel in the exhaust can burn and provide a sufficiently high temperature level at the entrance of the post-treatment system to be able to ensure the clearance.
• the object of the present invention is to propose a supercharged heat engine making it possible to optimize the rise in temperature in the exhaust circuit upstream of the post-treatment system in order to improve the efficiency of the depollution, in particular at low temperatures. load and low speed.
• the motor of the invention is essentially characterized in that the additional compressor is arranged in the intake circuit downstream of the compressor of turbocharger.
• This arrangement advantageously makes it possible to benefit from a first compression of the intake gases in the turbocharger compressor, so that the temperature is increased a first time, and then a second compression in the additional compressor arranged downstream in the combustion circuit. intake, so that the temperature can be increased a second time, before deflecting these gases into the injection pipe to be injected into the exhaust circuit upstream of the post-treatment system, which improves the rise in temperature and efficiency of the operating phases at wealth close to 1.
• a valve is disposed in the injection duct so as to control the flow of intake gas into the injection duct.
• the output of the additional compressor is connected to the intake circuit upstream of an air cooler disposed in the intake circuit.
• the injection conduit is connected to the exhaust circuit downstream of the turbocharger turbine.
• the injection conduit is connected to the exhaust circuit upstream of the turbocharger turbine.
• the intake circuit comprises a bypass duct arranged between the inlet and the outlet of the additional compressor, in which a bypass valve is arranged.
• the injection conduit comprises an intake gas reservoir adapted to provide an intake gas reserve that can be used in case of non-availability of the additional compressor.
• the reservoir comprises an inlet provided with a check valve, so as to prevent leakage of the intake gas to the intake circuit when the pressure in the reservoir is greater than the pressure in the flow circuit. admission to the outlet of the additional compressor.
• the invention also relates to a motor vehicle, characterized in that it comprises a motor as described above.
• the invention also relates to a method for controlling a supercharged heat engine as described above, characterized in that it comprises the steps in which:
• the activation of the additional compressor is authorized when the condition is detected
• the opening of the injection duct is controlled and the temperature upstream of the post-treatment system is regulated with respect to a target temperature value by controlling the flow of intake gas into the injection duct,
• the additional compressor is deactivated when the target temperature value is reached upstream of the treatment system.
• FIG. 1 schematically illustrates an architecture of an internal combustion engine supercharged by a turbocharger and comprising an additional compressor, according to a first embodiment according to the invention
• FIG. 2 illustrates an alternative embodiment of the motor illustrated in FIG. 1;
• FIG. 3 further illustrates an alternative embodiment of the motor illustrated in FIG. 1;
• FIG. 4 is a flowchart describing the engine control method according to the invention.
• FIG. 1 illustrates a supercharged heat engine 1 according to a first embodiment of the invention, of the type with four combustion cylinders 10, 12, 14, 16 in line in the example illustrated.
• the engine comprises an inlet gas intake circuit 2 comprising from upstream to downstream (with respect to the direction of flow of the gases): an air filter 20, a turbocharger compressor 21, called a main compressor, which sucks ambient air at atmospheric pressure and sends under pressure to the intake of the engine, a supercharged air cooler 22 (or RAS), an intake flap 23, such as for example a throttle body in the case a gasoline engine, and an intake manifold or intake manifold 24 connected to a cylinder intake inlet.
• an inlet gas intake circuit 2 comprising from upstream to downstream (with respect to the direction of flow of the gases): an air filter 20, a turbocharger compressor 21, called a main compressor, which sucks ambient air at atmospheric pressure and sends under pressure to the intake of the engine, a supercharged air cooler 22 (or RAS), an intake flap 23,
• the engine 1 also has an exhaust circuit 3 connected to an exhaust outlet of the engine cylinders, comprising from upstream to downstream (with respect to the direction of flow of the gases): a collector of exhaust 30, a turbocharger turbine 31, one or more exhaust aftertreatment systems 32, and an exhaust outlet 37 provided with an exhaust flap 38.
• the aftertreatment system exhaust gas 32 comprises a catalyst 320 and a particulate filter 321 located immediately after the catalyst. It may also include a nitrogen oxide trap (NOx).
• NOx nitrogen oxide trap
• the turbocharger turbine 31 is rotatably coupled to the main compressor 21 via a transmission shaft, and drives the main compressor 21 in rotation when the turbocharger turbine 31 is rotated by the gas turbines. exhaust coming out of the exhaust manifold 30.
• the engine 1 also comprises a circuit 33 for recirculating the high-pressure exhaust gases, from the exhaust circuit 3 to the intake circuit 2.
• This recirculation circuit is commonly called EGR-HP circuit, according to the acronym of "Exhaust Gas Recirculation - High Pressure”. It originates in the exhaust circuit 3, between the exhaust manifold 30 and the turbine 31, and it opens into the intake circuit 2, between the intake flap 23 and the intake manifold 24.
• This EGR-HP circuit 33 makes it possible to take a part of the gases circulating in the exhaust circuit 3 and reinject them into the engine cylinders in order to reduce the pollutant emissions of the engine, more particularly the emissions of nitrogen oxides.
• This EGR-HP circuit 33 comprises an EGR-HP valve 34 for regulating the flow of EGR gas opening into the inlet distributor 24.
• this EGR-HP circuit 33 is here supplemented by a low-pressure exhaust gas recirculation circuit 35, commonly known as the EGR-LP circuit according to the acronym "Exhaust Gas Recirculation - Low Pressure”.
• This EGR-LP circuit originates in the exhaust circuit 3, at the outlet of the post-processing system 32, and opens into the intake circuit 2, between the air filter 20 and the main compressor 21.
• This EGR-LP circuit 35 comprises an EGR-LP valve 36 for regulating the flow of EGR gas opening into the intake circuit 2.
• the heat engine comprises an additional compressor 25 disposed in the air intake circuit 2 downstream of the main compressor 21.
• the additional compressor 25 placed downstream of the main compressor 21, is here an electric compressor driven in rotation by means of an electric motor (not shown). It may also be a mechanical compressor, for example coupled to the crankshaft of the engine. Unlike the turbocharger, the operation of the additional compressor is independent of the exhaust gas and allows to provide air in large quantities to the intake whatever the level of load of the engine and in particular low load and low speed.
• This additional compressor has an inlet 26 and an outlet 27, said inlet 26 being connected in the intake circuit 2 downstream of the main compressor 21, or at the outlet of the latter, and said outlet 27 being connected on the one hand, to the intake circuit 2 upstream of the cooler 22 and, on the other hand, to the exhaust circuit 3 upstream of the aftertreatment system 32, via an intake gas injection duct 40.
• This injection duct 40 thus makes it possible to connect the outlet 27 of the additional compressor 25 disposed downstream of the main compressor 21, directly to the exhaust circuit 3 upstream of the post-treatment system 32 and thereby injecting pressurized air directly into the exhaust circuit 3 upstream of the post-treatment system 32 to promote the cleanup of the exhaust gases. 'exhaust.
• a pilot valve 41 is disposed in the injection duct 40 so as to make it possible to control the flow of air in the injection duct 40.
• the additional compressor 25 may be associated with a bypass duct 28 of the intake circuit extending between the inlet 26 and the outlet 27 of the additional compressor 25 and in which is disposed a
• the additional compressor 25 when the additional compressor 25 is deactivated, by controlling the opening of the bypass valve 29, the additional compressor 25 is bypassed.
• the branch is closed and the air having been the subject of a first compression in the main compressor 21, undergoes a second compression in the additional compressor 25.
• the injection duct 40 is connected to the exhaust circuit 3 downstream of the turbocharger turbine 31.
• the injection duct 40 connected to the outlet 27 of the additional compressor 25, is connected to the exhaust circuit 3 between the outlet of the turbocharger turbine 31 and the inlet of the aftertreatment system 32.
• This injection pipe 40 may also be connected to another part of the exhaust circuit.
• the injection duct 40 is connected to the exhaust circuit 3 upstream of the turbocharger turbine 31.
• the pressurized air from the outlet 27 of the additional compressor 25 is injected into the exhaust circuit 3 between the combustion cylinders of the engine and the inlet of the engine.
• Turbocharger turbine 31 it will be sought to connect the injection duct 40 as close as possible to the combustion cylinders of the engine at the level of the exhaust circuit, so as to be able to benefit from the highest possible temperature and so as to be able to benefit from a mixing length between the air and the excess fuel over the exhaust as much as possible before arrival in the post-processing system 32.
• the air injection duct 40 comprises a reservoir 42, arranged between the outlet of the additional compressor 25 and the piloted valve 41.
• This reservoir has for example a volume equal to about 5 liters.
• the reservoir 42 makes it possible to constitute an air reserve resulting from the compression inside the additional compressor 25, which can be used to be injected into the exhaust circuit upstream of the post-treatment system, when periods of non-availability of the additional compressor 25, for example because the charge of the battery necessary to power the electric motor of the additional compressor is not sufficient.
• the air reserve provided by the tank 42 may be used to overcome the non-availability of the additional compressor 25.
• the inlet of the tank 42 is advantageously provided with a non-return valve 43, so as to allow preventing air leakage to the intake circuit when the pressure in the tank 42 is greater than the pressure in the intake circuit at the outlet of the additional compressor 25.
• FIG. 4 illustrates the engine control method according to the invention during low load and low speed operating phases, in which the engine must have a sufficient quantity of air to be able to operate at a richness close to 1.
• the fuel is injected in such proportions that the richness of the air / fuel mixture is equal to a value close to 1, generally in the stoichiometric proportions. In this case, it is appropriate to inject air into the exhaust system to promote the cleanup of exhaust gases.
• a mixture richness condition is detected for which it is expedient to inject air into the exhaust circuit in order to provide a sufficiently high temperature level at the inlet of the post-treatment system. to be able to clean the exhaust gases.
• the activation of the additional compressor 25 is allowed when the richness of the mixture Ri is determined greater than or equal to 0.9, for example in the step E0.
• a step E2 it is then necessary to open the valve 41 of the injection duct 40 to manage the flow of air in the injection conduit 40 and therefore the flow of air injected at the level of the exhaust.
• the temperature T3 of the exhaust gases is measured in the exhaust circuit at the inlet of the aftertreatment system 32, ie in the portion of the exhaust circuit between the outlet of the turbocharger turbine 31 and the exhaust system. entry of the post-processing system 32, and this temperature is regulated so as to achieve a target temperature value T3_cible, provided as a parameter of the strategy, for which one has the desired efficiency for the pollution of the exhaust gas .
• the temperature at the inlet of the post-treatment system 32 is regulated with respect to the target temperature value T3_cible by a control of the valve 41 of the injection duct 40.
• a regulation of the supercharging pressure obtained with the turbocharger compressor 21 and the additional compressor 25 is also carried out, so as to reach a target target pressure value Psural_cible.
• This regulation is performed on the basis of the difference between the pressure measured in the intake manifold Pcoll and the target pressure boost value Psural_cible.
• a regulation of the quantity of injected fuel is implemented so that the richness of the mixture Ri reaches a target value of target richness Ri.
• the boost pressure and mixture richness target values are provided as parameters of the control process.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Supercharger (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=57750254

Family Applications (1)

Country Status (3)

Families Citing this family (3)

Family Cites Families (6)

• 2016
  • 2016-11-04 FR FR1660709A patent/FR3058464B1/fr active Active
• 2017
  • 2017-10-26 WO PCT/FR2017/052956 patent/WO2018083400A1/fr unknown
  • 2017-10-26 EP EP17797979.6A patent/EP3535483A1/de not_active Withdrawn

Also Published As

Similar Documents

Legal Events