EP3535483A1 - System for injecting air into a gas exhaust circuit of a supercharged heat engine - Google Patents

System for injecting air into a gas exhaust circuit of a supercharged heat engine

Info

Publication number
EP3535483A1
EP3535483A1 EP17797979.6A EP17797979A EP3535483A1 EP 3535483 A1 EP3535483 A1 EP 3535483A1 EP 17797979 A EP17797979 A EP 17797979A EP 3535483 A1 EP3535483 A1 EP 3535483A1
Authority
EP
European Patent Office
Prior art keywords
circuit
intake
exhaust
compressor
additional compressor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17797979.6A
Other languages
German (de)
French (fr)
Inventor
Alain Lefebvre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Nissan Motor Co Ltd
Original Assignee
Renault SAS
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS, Nissan Motor Co Ltd filed Critical Renault SAS
Publication of EP3535483A1 publication Critical patent/EP3535483A1/en
Withdrawn legal-status Critical Current

Links

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.

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Abstract

The invention relates to a supercharged heat engine (1) comprising an intake gas intake circuit (2) connected to an intake inlet to the engine cylinders (10, 12, 14, 16) and an exhaust circuit (3) connected to an exhaust outlet from the cylinders, the intake circuit comprising a turbocharger compressor (21) and the exhaust circuit comprising, on one hand, a turbocharger turbine (31) rotationally coupled to the compressor (21) and, on the other hand, a system (32) for aftertreatment of the exhaust gases at the outlet from the turbine (31), said intake circuit (2) comprising an additional compressor (25) having an outlet (27) connected to an intake gas injection pipe (40) connecting the intake circuit (2) downstream of the additional compressor (25) to the exhaust circuit (3) upstream of the exhaust gas aftertreatment system (32) and the additional compressor (25) is arranged in the intake circuit (2) downstream of the compressor (21).

Description

Système d'injection d'air dans un circuit d'échappement de gaz d'un moteur thermique suralimenté  Air injection system in a gas exhaust circuit of a supercharged engine
La présente invention concerne un moteur thermique suralimenté comprenant des cylindres de combustion, un circuit d'admission de gaz d'admission relié à une entrée d'admission des cylindres et un circuit d'échappement relié à une sortie d'échappement des cylindres, le circuit d'admission comprenant un compresseur de turbocompresseur et le circuit d'échappement comprenant d'une part, une turbine de turbocompresseur couplée en rotation au compresseur de turbocompresseur et reliée à la sortie d'échappement des cylindres pour être entraînée en rotation par les gaz d'échappement et, d'autre part, un système de post-traitement des gaz d'échappement à la sortie de la turbine de turbocompresseur, ledit circuit d'admission comprenant en outre un compresseur additionnel présentant une sortie connectée à un conduit d'injection de gaz d'admission reliant le circuit d'admission en aval du compresseur additionnel au circuit d'échappement en amont du système de post-traitement des gaz d'échappement. 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.
Un tel moteur est bien connu notamment par l'exemple qu'en donne la publication FR-A1 -2990467, qui décrit un moteur du type précité dans lequel le système de post-traitement des gaz comporte un catalyseur et qui vise à pallier les difficultés liées au fonctionnement du catalyseur lors de certaines phases de fonctionnement du véhicule, comme par exemple lors d'un démarrage à froid. Selon ce document, le compresseur additionnel, en l'occurrence un compresseur électrique, qui est initialement prévu pour accroître la quantité d'air sous pression admise à l'admission, en particulier à bas régime, peut être utilisé, au moins périodiquement, pour envoyer de l'air sous pression directement dans le circuit d'échappement en amont du catalyseur via le conduit d'injection. L'air sous pression ainsi fourni par le compresseur électrique peut participer au chauffage du catalyseur et permet d'accélérer le chauffage du catalyseur.  Such an engine is well known in particular by the example given in the publication FR-A1 -2990467, which describes an engine of the aforementioned type in which the gas after-treatment system comprises a catalyst and which aims to overcome the difficulties. related to the operation of the catalyst during certain phases of operation of the vehicle, such as during a cold start. According to this document, 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.
Cependant, ce système ne permet pas d'obtenir une montée en température satisfaisante en amont du système de post-traitement. En particulier, lors des phases de fonctionnement du moteur à faible charge et bas régime, le moteur doit avoir une quantité d'air suffisante pour pouvoir fonctionner à une richesse proche de 1 ou légèrement supérieure à cette valeur, de manière que l'excédent de carburant à l'échappement puisse brûler et fournir un niveau de température suffisamment élevé à l'entrée du système de post-traitement pour pouvoir assurer la dépollution. However, this system does not provide a satisfactory rise in temperature upstream of the post-processing system. In particular, during low and low load engine operation phases engine, 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.
Dans ce contexte, la présente invention a pour but de proposer un moteur thermique suralimenté permettant d'optimiser la montée en température dans le circuit d'échappement en amont du système de post-traitement pour améliorer l'efficacité de la dépollution en particulier à faible charge et bas régime.  In this context, 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.
A cette fin, le moteur de l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule ci-dessus, est essentiellement caractérisé en ce que le compresseur additionnel est disposé dans le circuit d'admission en aval du compresseur de turbocompresseur.  For this purpose, the motor of the invention, moreover in conformity with the generic definition given in the preamble above, is essentially characterized in that the additional compressor is arranged in the intake circuit downstream of the compressor of turbocharger.
Cet agencement permet avantageusement de bénéficier d'une première compression des gaz d'admission dans le compresseur de turbocompresseur, de sorte que la température est augmentée une première fois, puis d'une deuxième compression dans le compresseur additionnel disposé en aval dans le circuit d'admission, de sorte que la température peut être augmentée une seconde fois, avant de dévier ces gaz dans le conduit d'injection pour être injecté dans le circuit d'échappement en amont du système de post-traitement, ce qui améliore la montée en température et l'efficacité des phases de fonctionnement à richesse proche de 1 .  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.
Avantageusement, une vanne est disposée dans le conduit d'injection de façon à permettre de contrôler le flux de gaz d'admission dans le conduit d'injection.  Advantageously, a valve is disposed in the injection duct so as to control the flow of intake gas into the injection duct.
De préférence, la sortie du compresseur additionnel est reliée au circuit d'admission en amont d'un refroidisseur à air disposé dans le circuit d'admission.  Preferably, the output of the additional compressor is connected to the intake circuit upstream of an air cooler disposed in the intake circuit.
Selon un mode de réalisation, le conduit d'injection est relié au circuit d'échappement en aval de la turbine de turbocompresseur.  According to one embodiment, the injection conduit is connected to the exhaust circuit downstream of the turbocharger turbine.
Selon un autre mode de réalisation, le conduit d'injection est relié au circuit d'échappement en amont de la turbinede turbocompresseur. Avantageusement, le circuit d'admission comporte un conduit de dérivation agencé entre l'entrée et la sortie du compresseur additionnel, dans lequel est disposée une vanne de dérivation. According to another embodiment, the injection conduit is connected to the exhaust circuit upstream of the turbocharger turbine. Advantageously, 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.
Avantageusement, le conduit d'injection comporte un réservoir de gaz d'admission apte à procurer une réserve de gaz d'admission susceptible d'être utilisée en cas de non disponibilité du compresseur additionnel.  Advantageously, 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.
De préférence, le réservoir comporte une entrée munie d'un clapet antiretour, de façon à permettre d'éviter des fuites de gaz d'admission vers le circuit d'admission lorsque la pression dans le réservoir est supérieure à la pression dans le circuit d'admission à la sortie du compresseur additionnel.  Preferably, 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.
L'invention concerne également un véhicule automobile, caractérisé en ce qu'il comprend un moteur tel que décrit ci-dessus.  The invention also relates to a motor vehicle, characterized in that it comprises a motor as described above.
L'invention concerne encore un procédé de contrôle d'un moteur thermique suralimenté tel que décrit ci-dessus, caractérisé en ce qu'il comprend les étapes dans lesquelles :  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:
- on détecte une condition de richesse du mélange air/carburant admis dans les cylindres du moteur proche de 1 ;  a richness condition of the air / fuel mixture admitted into the cylinders of the engine close to 1 is detected;
- on autorise l'activation du compresseur additionnel lorsque la condition est détectée ;  the activation of the additional compressor is authorized when the condition is detected;
- on commande l'ouverture du conduit d'injection et on régule la température en amont du système de post-traitement par rapport à une valeur cible de température en contrôlant le flux de gaz d'admission dans le conduit d'injection,  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,
- on désactive le compresseur additionnel lorsque la valeur cible de température est atteinte en amont du système de traitement.  the additional compressor is deactivated when the target temperature value is reached upstream of the treatment system.
D'autres particularités et avantages de l'invention ressortiront à la lecture de la description faite ci-après, donnée à titre indicatif mais non limitatif, en référence aux dessins annexés sur lesquels :  Other features and advantages of the invention will appear on reading the description given below, given by way of indication but not limitation, with reference to the accompanying drawings in which:
- la figure 1 illustre de façon schématique une architecture de moteur à combustion interne suralimenté par un turbocompresseur et comportant un compresseur additionnel, suivant un premier mode de réalisation conforme à l'invention ; - la figure 2 illustre une variante de réalisation du moteur illustré à la figure 1 ; 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;
- la figure 3 illustre encore une variante de réalisation du moteur illustré à la figure 1 ;  FIG. 3 further illustrates an alternative embodiment of the motor illustrated in FIG. 1;
- la figure 4 est un organigramme décrivant le procédé de contrôle du moteur selon l'invention.  FIG. 4 is a flowchart describing the engine control method according to the invention.
La figure 1 illustre un moteur thermique 1 suralimenté conforme à un premier mode de réalisation de l'invention, de type à quatre cylindres de combustion 10, 12, 14, 16 en ligne dans l'exemple illustré. Le moteur comporte un circuit d'admission de gaz d'admission 2 comprenant d'amont en aval (par rapport au sens d'écoulement des gaz) : un filtre à air 20, un compresseur 21 de turbocompresseur, dit compresseur principal, qui aspire l'air ambiant à la pression atmosphérique et l'envoie sous pression à l'admission du moteur, un refroidisseur d'air suralimenté 22 (ou R.A.S.), un volet d'admission 23, tel que par exemple un boîtier papillon dans le cas d'un moteur à essence, et un répartiteur d'admission ou collecteur d'admission 24 relié à une entrée d'admission des cylindres.  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.
Par ailleurs, le moteur 1 dispose également d'un circuit d'échappement 3 reliée à une sortie d'échappement des cylindres du moteur, comportant d'amont en aval (par rapport au sens d'écoulement des gaz) : un collecteur d'échappement 30, une turbine 31 de turbocompresseur, un ou plusieurs systèmes de post-traitement des gaz d'échappement 32, et une sortie d'échappement 37 munie d'un volet d'échappement 38. Par exemple, le système de post-traitement des gaz d'échappement 32 comprend un catalyseur 320 et un filtre à particules 321 situé juste après le catalyseur. Il peut également comprendre un piège à oxydes d'azote (NOx).  Moreover, 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. For example, 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).
La turbine 31 de turbocompresseur est couplée en rotation au compresseur principal 21 par l'intermédiaire d'un arbre de transmission, et permet d'entraîner le compresseur principal 21 en rotation lorsque la turbine 31 de turbocompresseur est entraînée en rotation par les gaz d'échappement sortant du collecteur d'échappement 30.  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.
Ici, le moteur 1 comporte également un circuit 33 de recirculation des gaz d'échappement à haute pression, depuis le circuit d'échappement 3 vers le circuit d'admission 2. Ce circuit de recirculation est communément appelée circuit EGR-HP, conformément à l'acronyme anglo-saxon de « Exhaust Gaz Recirculation - High Pressure ». Il prend naissance dans le circuit d'échappement 3, entre le collecteur d'échappement 30 et la turbine 31 , et il débouche dans le circuit d'admission 2, entre le volet d'admission 23 et le répartiteur d'admission 24. Here, 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.
Ce circuit EGR-HP 33 permet de prélever une partie des gaz circulant dans le circuit d'échappement 3 et de les réinjecter dans les cylindres du moteur afin de réduire les émissions polluantes du moteur, plus particulièrement les émissions d'oxydes d'azote. Ce circuit EGR-HP 33 comporte une vanne EGR-HP 34 pour régler le débit de gaz EGR débouchant dans le répartiteur d'admission 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.
En complément, ce circuit EGR-HP 33 est ici complété par un circuit 35 de recirculation des gaz d'échappement à basse pression, communément appelée circuit EGR-LP conformément à l'acronyme anglo-saxon de « Exhaust Gaz Recirculation - Low Pressure ». Ce circuit EGR-LP prend naissance dans le circuit d'échappement 3, à la sortie du système de post-traitement 32, et débouche dans le circuit d'admission 2, entre le filtre à air 20 et le compresseur principal 21 . Ce circuit EGR-LP 35 comporte une vanne EGR-LP 36 pour régler le débit de gaz EGR débouchant dans le circuit d'admission 2.  In addition, 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.
Selon une caractéristique essentielle de l'invention, le moteur thermique comprend un compresseur additionnel 25, disposé dans le circuit d'admission d'air 2 en aval du compresseur principal 21 .  According to an essential characteristic of the invention, the heat engine comprises an additional compressor 25 disposed in the air intake circuit 2 downstream of the main compressor 21.
Le compresseur additionnel 25 placé en aval du compresseur principal 21 , est ici un compresseur électrique entraîné en rotation au moyen d'un moteur électrique (non représenté). Il peut également s'agir d'un compresseur mécanique, par exemple couplé au vilebrequin du moteur. Contrairement au turbocompresseur, le fonctionnement du compresseur additionnel est indépendant des gaz d'échappement et permet de fournir de l'air en grande quantité à l'admission quel que soit le niveau de charge du moteur et notamment à faible charge et à bas régime.  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.
Ce compresseur additionnel présente une entrée 26 et une sortie 27, ladite entrée 26 étant reliée dans le circuit d'admission 2 en aval du compresseur principal 21 , soit à la sortie de ce dernier, et ladite sortie 27 étant reliée d'une part, au circuit d'admission 2 en amont du refroidisseur 22 et, d'autre part, au circuit d'échappement 3 en amont du système de posttraitement 32, par l'intermédiaire d'un conduit d'injection de gaz d'admission 40. Ce conduit d'injection 40 permet donc de relier la sortie 27 du compresseur additionnel 25 disposé en aval du compresseur principal 21 , directement au circuit d'échappement 3 en amont du système de post-traitement 32 et partant, d'injecter de l'air sous pression directement dans le circuit d'échappement 3 en amont du système de post-traitement 32 pour favoriser la dépollution des gaz d'échappement. Une vanne pilotée 41 est disposée dans le conduit d'injection 40 de façon à permettre de contrôler le flux d'air dans le conduit d'injection 40. 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.
Selon le mode de réalisation de la figure 1 , le compresseur additionnel 25 peut être associé à un conduit de dérivation 28 du circuit d'admission s'étendant entre l'entrée 26 et la sortie 27 du compresseur additionnel 25 et dans lequel est disposée une vanne de dérivation 29. Ainsi, lorsque le compresseur additionnel 25 est désactivé, en commandant l'ouverture de la vanne de dérivation 29, on court-circuite le compresseur additionnel 25. Par contre, lorsque le compresseur additionnel 25 est activé, la vanne de dérivation est fermée et l'air ayant fait l'objet d'une première compression dans le compresseur principal 21 , subit une seconde compression dans le compresseur additionnel 25.  According to the embodiment of FIG. 1, 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 By way of example, when the additional compressor 25 is deactivated, by controlling the opening of the bypass valve 29, the additional compressor 25 is bypassed. On the other hand, when the additional compressor 25 is activated, 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.
Conformément au mode de réalisation de la figure 1 , le conduit d'injection 40 est relié au circuit d'échappement 3 en aval de la turbine 31 de turbocompresseur. Autrement dit, le conduit d'injection 40, connecté à la sortie 27 du compresseur additionnel 25, est relié au circuit d'échappement 3 entre la sortie de la turbine 31 de turbocompresseur et l'entrée du système de posttraitement 32.  In accordance with the embodiment of FIG. 1, the injection duct 40 is connected to the exhaust circuit 3 downstream of the turbocharger turbine 31. In other words, 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.
Ce conduit d'injection 40 pourra également être relié à un autre endroit du circuit d'échappement. Selon une variante de réalisation illustrée à la figure 2, le conduit d'injection 40 est relié au circuit d'échappement 3 en amont de la turbine 31 de turbocompresseur. Autrement dit, l'air sous pression issu de la sortie 27 du compresseur additionnel 25 est injecté dans le circuit d'échappement 3 entre les cylindres de combustion du moteur et l'entrée de la turbine 31 de turbocompresseur. On cherchera en particulier à relier le conduit d'injection 40 au plus près des cylindres de combustion du moteur au niveau du circuit d'échappement, de manière à pouvoir profiter d'une température la plus élevée possible et de manière à pouvoir bénéficier d'une longueur de mélange entre l'air et l'excédent de carburant à l'échappement la plus importante possible avant l'arrivée dans le système de post-traitement 32. This injection pipe 40 may also be connected to another part of the exhaust circuit. According to an alternative embodiment illustrated in FIG. 2, the injection duct 40 is connected to the exhaust circuit 3 upstream of the turbocharger turbine 31. In other words, 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. In particular, 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.
Suivant la variante de réalisation de la figure 3, le conduit d'injection d'air 40 comporte un réservoir 42, agencée entre la sortie du compresseur additionnel 25 et la vanne pilotée 41 . Ce réservoir présente par exemple un volume égal à environ 5 litres. Le réservoir 42 permet de constituer une réserve d'air issu de la compression à l'intérieur du compresseur additionnel 25, qui est susceptible d'être utilisée pour être injectée dans le circuit d'échappement en amont du système de post-traitement, lors de périodes de non disponibilité du compresseur additionnel 25, par exemple parce que la charge de la batterie nécessaire pour alimenter le moteur électrique du compresseur additionnel n'est pas suffisante. Dans ce cas, la réserve d'air procurée par le réservoir 42 pourra être utilisée pour pallier la non disponibilité du compresseur additionnel 25. L'entrée du réservoir 42 est avantageusement munie d'un clapet anti-retour 43, de façon à permettre d'éviter des fuites d'air vers le circuit d'admission lorsque la pression dans le réservoir 42 est supérieure à la pression dans le circuit d'admission à la sortie du compresseur additionnel 25.  According to the variant embodiment of FIG. 3, 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. In this case, 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.
La figure 4 illustre le procédé de contrôle du moteur selon l'invention lors de phases de fonctionnement à faibles charge et bas régimes, dans lesquelles le moteur doit avoir une quantité d'air suffisante pour pouvoir fonctionner à une richesse proche de 1 . Autrement dit, le carburant est injecté dans des proportions telles que la richesse du mélange air/carburant soit égale à une valeur proche de 1 , en général dans les proportions stœchiométriques. Dans ce cas, il est opportun d'injecter de l'air dans le circuit d'échappement pour favoriser la dépollution des gaz d'échappement.  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. In other words, 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.
Dans le cas d'un moteur diesel, il pourra s'agir d'injecter de l'air sous pression au niveau du circuit d'échappement en amont du système de posttraitement pendant les phases à richesse proches de 1 , pour augmenter la montée en température à l'échappement en entrée du système de posttraitement et favoriser ces phases à richesse proche de 1 (permettant par exemple la régénération du filtre particules, la régénération du piège à oxydes d'azote (élimination des oxydes d'azote dite deNOx) ou sa désulfatation (élimination des oxydes de soufres dite deSOx)). In the case of a diesel engine, it may be to inject air under pressure at the exhaust circuit upstream of the aftertreatment system during rich phases close to 1, to increase the temperature rise in the exhaust at the inlet of the aftertreatment system and favoring these phases with a richness close to 1 (allowing, for example, the regeneration of the particulate filter, the regeneration of the nitrogen oxide trap (removal of nitrogen oxides called NOx ) or its desulfation (removal of so-called deoxidized sulfur oxides)).
Dans le cas d'un moteur à essence muni d'un filtre à particules, on cherche à injecter de l'air sous pression à l'échappement pour favoriser le fonctionnement à richesse supérieure ou égale à 1 pendant la phase de régénération du filtre à particules.  In the case of a gasoline engine equipped with a particulate filter, it is sought to inject pressurized air into the exhaust to promote operation with a richness of greater than or equal to 1 during the regeneration phase of the filter. particles.
Dans une étape E0, on détecte une condition de richesse du mélange pour laquelle il est opportun d'injecter de l'air dans le circuit d'échappement afin de fournir un niveau de température suffisamment élevée à l'entrée du système de post-traitement pour pouvoir assurer la dépollution des gaz d'échappement. On autorise dans une étape E1 l'activation du compresseur additionnel 25 lorsque la richesse du mélange Ri est déterminée supérieure ou égale à 0,9 par exemple dans l'étape E0.  In a step E0, 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. In a step E1, 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.
Dans une étape E2, on commande alors à l'ouverture la vanne 41 du conduit d'injection 40 permettant de gérer le flux d'air dans le conduit d'injection 40 et par conséquent le flux d'air injecté au niveau de l'échappement. Puis, on mesure la température T3 des gaz d'échappement dans le circuit d'échappement en entrée du système de post-traitement 32, soit dans la portion du circuit d'échappement comprise entre la sortie de la turbine 31 de turbocompresseur et l'entrée du système de post-traitement 32, et on régule cette température de façon à atteindre une valeur cible de température T3_cible, fourni en tant que paramètre de la stratégie, pour laquelle on a l'efficacité souhaitée pour la dépollution des gaz d'échappement. On régule la température en entrée du système de post-traitement 32 par rapport à la valeur cible de température T3_cible par un pilotage de la vanne 41 du conduit d'injection 40.  In 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. Then, 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.
On met également en œuvre dans une étape E4, une régulation de la pression de suralimentation obtenue avec le compresseur 21 de turbocompresseur et le compresseur additionnel 25, de façon à atteindre une valeur cible de pression de suralimentation Psural_cible. Cette régulation est effectuée sur la base de l'écart entre la pression mesurée dans le collecteur d'admission Pcoll et la valeur cible de pression de suralimentation Psural_cible. Parallèlement, On met en œuvre une régulation de la quantité de carburant injecté de façon que la richesse du mélange Ri atteigne une valeur cible de richesse Ri cible. Les valeurs cibles de pression de suralimentation et de richesse du mélange sont fournies en tant que paramètres du procédé de contrôle. In a step E4, 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. At the same time, 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.
Lorsque la condition sur la valeur cible de température T3_cible en amont du système de post-traitement 32 est atteinte, on commande l'arrêt du procédé dans une étape E4 et on désactive le compresseur additionnel 25.  When the condition on the target temperature value T3_cible upstream of the post-processing system 32 is reached, the process is stopped in a step E4 and the additional compressor 25 is deactivated.

Claims

REVENDICATIONS
1 . Moteur thermique suralimenté (1 ) comprenant des cylindres de combustion (10, 12, 14, 16), un circuit d'admission de gaz d'admission (2) relié à une entrée d'admission des cylindres et un circuit d'échappement (3) relié à une sortie d'échappement des cylindres, le circuit d'admission comprenant un compresseur (21 ) de turbocompresseur et le circuit d'échappement comprenant d'une part, une turbine (31 ) de turbocompresseur couplée en rotation au compresseur (21 ) de turbocompresseur et reliée à la sortie d'échappement des cylindres pour être entraînée en rotation par les gaz d'échappement et, d'autre part, un système de post-traitement (32) des gaz d'échappement à la sortie de la turbine (31 ) de turbocompresseur, ledit circuit d'admission (2) comprenant en outre un compresseur additionnel (25) présentant une sortie (27) connectée à un conduit d'injection de gaz d'admission (40) reliant le circuit d'admission (2) en aval du compresseur additionnel (25) au circuit d'échappement (3) en amont du système de posttraitement (32) des gaz d'échappement, ledit moteur étant caractérisé en ce que le compresseur additionnel (25) est disposé dans le circuit d'admission (2) en aval du compresseur (21 ) de turbocompresseur. 1. Supercharged engine (1) comprising combustion cylinders (10, 12, 14, 16), an intake gas intake circuit (2) connected to an intake of the cylinders and an exhaust circuit ( 3) connected to an exhaust outlet of the cylinders, the intake circuit comprising a turbocharger compressor (21) and the exhaust system comprising, on the one hand, a turbocharger turbine (31) rotatably coupled to the compressor ( 21) and connected to the exhaust outlet of the cylinders to be rotated by the exhaust gas and, on the other hand, an aftertreatment system (32) of the exhaust gas at the outlet of the turbocharger turbine (31), said intake circuit (2) further comprising an additional compressor (25) having an outlet (27) connected to an inlet gas injection duct (40) connecting the combustion circuit inlet (2) downstream of the additional compressor (25) to the circuit exhaust system (3) upstream of the aftertreatment system (32) of the exhaust gas, said engine being characterized in that the additional compressor (25) is arranged in the intake circuit (2) downstream of the compressor ( 21) turbocharger.
2. Moteur selon la revendication 1 , caractérisé en ce qu'une vanne (41 ) est disposée dans le conduit d'injection (40) de façon à permettre de contrôler le flux de gaz d'admission dans le conduit d'injection (40).  2. Engine according to claim 1, characterized in that a valve (41) is disposed in the injection duct (40) so as to control the flow of intake gas into the injection duct (40). ).
3. Moteur selon la revendication 1 ou 2, caractérisé en ce que la sortie (27) du compresseur additionnel est reliée au circuit d'admission (2) en amont d'un refroidisseur à air (22) disposé dans le circuit d'admission.  3. Engine according to claim 1 or 2, characterized in that the outlet (27) of the additional compressor is connected to the intake circuit (2) upstream of an air cooler (22) disposed in the intake circuit. .
4. Moteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le conduit d'injection (40) est relié au circuit d'échappement (3) en aval de la turbine (31 ) de turbocompresseur.  4. Engine according to any one of the preceding claims, characterized in that the injection duct (40) is connected to the exhaust circuit (3) downstream of the turbocharger turbine (31).
5. Moteur selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le conduit d'injection (40) est relié au circuit d'échappement (3) en amont de la turbine (31 ) de turbocompresseur.  5. Motor according to any one of claims 1 to 3, characterized in that the injection duct (40) is connected to the exhaust circuit (3) upstream of the turbocharger turbine (31).
6. Moteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le circuit d'admission (2) comporte un conduit de dérivation (28) agencé entre l'entrée (26) et la sortie (27) du compresseur additionnel (25), dans lequel est disposée une vanne de dérivation (29). 6. Motor according to any one of the preceding claims, characterized in that the intake circuit (2) comprises a conduit of bypass (28) arranged between the inlet (26) and the outlet (27) of the additional compressor (25), in which a bypass valve (29) is disposed.
7. Moteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le conduit d'injection (40) comporte un réservoir de gaz d'admission (42) apte à procurer une réserve de gaz d'admission susceptible d'être utilisée en cas de non disponibilité du compresseur additionnel (25).  7. Motor according to any one of the preceding claims, characterized in that the injection duct (40) comprises an intake gas reservoir (42) adapted to provide an intake gas reserve that can be used. in case of non-availability of the additional compressor (25).
8. Moteur selon la revendication 7, caractérisé en ce que le réservoir comporte une entrée munie d'un clapet anti-retour (43), de façon à permettre d'éviter des fuites de gaz d'admission vers le circuit d'admission lorsque la pression dans le réservoir (42) est supérieure à la pression dans le circuit d'admission à la sortie du compresseur additionnel (25).  8. Motor according to claim 7, characterized in that the reservoir comprises an inlet provided with a non-return valve (43), so as to prevent leakage of the intake gas to the intake circuit when the pressure in the reservoir (42) is greater than the pressure in the intake circuit at the outlet of the additional compressor (25).
9. Véhicule automobile caractérisé en ce qu'il comprend un moteur selon l'une quelconque des revendications précédentes.  9. Motor vehicle characterized in that it comprises an engine according to any one of the preceding claims.
10. Procédé de contrôle d'un moteur thermique suralimenté (1 ) selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'il comprend les étapes dans lesquelles :  10. A method of controlling a supercharged engine (1) according to any one of claims 1 to 8, characterized in that it comprises the steps in which:
- on détecte (E0) une condition de richesse du mélange air/carburant admis dans les cylindres du moteur proche de 1 ;  detecting (E0) a condition of richness of the air / fuel mixture admitted into the cylinders of the engine close to 1;
- on autorise (E1 ) l'activation du compresseur additionnel (25) lorsque la condition est détectée ;  the activation of the additional compressor (25) is authorized (E1) when the condition is detected;
- on commande (E2) l'ouverture du conduit d'injection (40) et on régule la température (T3) en amont du système de post-traitement (32) par rapport à une valeur cible de température (T3_cible) en contrôlant le flux de gaz d'admission dans le conduit d'injection (40),  the opening of the injection duct (40) is controlled (E2) and the temperature (T3) upstream of the post-treatment system (32) is regulated with respect to a target temperature value (T3_cible) by controlling the intake gas flow in the injection pipe (40),
- on désactive (E4) le compresseur additionnel (25) lorsque la valeur cible de température est atteinte en amont du système de traitement (32).  the additional compressor (25) is deactivated (E4) when the target temperature value is reached upstream of the treatment system (32).
EP17797979.6A 2016-11-04 2017-10-26 System for injecting air into a gas exhaust circuit of a supercharged heat engine Withdrawn EP3535483A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1660709A FR3058464B1 (en) 2016-11-04 2016-11-04 AIR INJECTION SYSTEM INTO A GAS EXHAUST CIRCUIT OF A SUPERCHARGED THERMAL ENGINE.
PCT/FR2017/052956 WO2018083400A1 (en) 2016-11-04 2017-10-26 System for injecting air into a gas exhaust circuit of a supercharged heat engine

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FR3089557A1 (en) * 2018-12-10 2020-06-12 Valeo Systemes De Controle Moteur Assembly comprising an engine and an electric compressor configured to heat the exhaust gases
DE102021002188A1 (en) 2021-04-26 2022-10-27 Mercedes-Benz Group AG Method of heating a catalytic converter
US11639703B1 (en) * 2022-06-21 2023-05-02 Garrett Transportation I Inc. System and method using secondary air pump for secondary air injection into turbocharged internal combustion engine exhaust and for transiently augmenting engine boost pressure, including means for supressing surge of the secondary air pump

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JPH08200047A (en) * 1995-01-25 1996-08-06 Nissan Diesel Motor Co Ltd Exhaust emission control device for engine
DE10023022A1 (en) * 2000-05-11 2001-11-22 Borgwarner Inc Supercharged internal combustion engine
FR2872858B1 (en) * 2004-07-09 2009-02-06 Renault Sas SUPERIMENT THERMAL MOTOR WITH ADDITIONAL COMPRESSOR
FR2931514A3 (en) * 2008-05-22 2009-11-27 Renault Sas Exhaust gas post-treatment device e.g. particle filter, regenerating method for diesel engine of motor vehicle, involves utilizing low pressure turbocompressor for supplying air via exhaust pipe in upstream of post-treatment device
FR2990467B1 (en) * 2012-05-10 2017-12-15 Valeo Systemes De Controle Moteur AIR INJECTION SYSTEM IN A GAS EXHAUST CIRCUIT
DE102014223491A1 (en) * 2014-11-18 2016-05-19 Bayerische Motoren Werke Aktiengesellschaft Exhaust treatment device and method for exhaust treatment

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