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WO2005119036A1 - Internal combustion engine comprising an exhaust gas recirculation system for regulating the suction temperature - Google Patents

Internal combustion engine comprising an exhaust gas recirculation system for regulating the suction temperature Download PDF

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Publication number
WO2005119036A1
WO2005119036A1 PCT/EP2005/005717 EP2005005717W WO2005119036A1 WO 2005119036 A1 WO2005119036 A1 WO 2005119036A1 EP 2005005717 W EP2005005717 W EP 2005005717W WO 2005119036 A1 WO2005119036 A1 WO 2005119036A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
internal combustion
combustion engine
regulating
compressor
Prior art date
Application number
PCT/EP2005/005717
Other languages
German (de)
French (fr)
Inventor
Wolfram Schmid
Siegfried Sumser
Original Assignee
Daimlerchrysler Ag
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 Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2005119036A1 publication Critical patent/WO2005119036A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • 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
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0418—Layout of the intake air cooling or coolant circuit the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface
    • 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
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment 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
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to an internal combustion engine with an exhaust gas aftertreatment system and a method for controlling the exhaust gas temperature according to the preamble of claim 1 and claim 5.
  • Implementation efficiency of nitrogen oxide reduction in an SCR catalytic converter is achieved at exhaust gas temperatures in a range from approximately 250 ° to 550 ° Celsius.
  • An internal combustion engine on the other hand, has exhaust gas temperatures of less than 250 ° Celsius both in the partial load range and in the cold start phase.
  • the SCR catalytic converter is generally not located directly at the exhaust valve of the internal combustion engine, so that the exhaust gas temperature is further reduced by means of wall heat losses in the exhaust gas pipes.
  • the SCR catalytic converter is located downstream of the turbine and there is a further reduction in exhaust gas temperature due to the thermodynamic process in the turbine. The low exhaust gas temperatures that occur in the named operating ranges have to be increased.
  • the publication DE 102 49 880 AI describes an emission control device and an emission control method of an internal combustion engine, the emission control device of the internal combustion engine comprising a NO x catalytic converter, a warming-up device for heating the NO x catalytic converter and an operating state detection device for detecting the operating state of the internal combustion engine.
  • the heating device of the emission control device is used in such a way that either the injected fuel is oxidized in the NO x catalyst and the temperature of the NO x catalyst is raised due to the heat generated by the oxidation, or the injected fuel reduces the oxygen concentration of the exhaust gas mass flow and brings about a reduction in the nitrogen oxides in the filter.
  • a disadvantage of the emission control device is an additional installation of a fuel line with a retentive valve and the installation of an injection valve in the exhaust manifold.
  • the invention is based on the problem of achieving a high efficiency of the SCR catalytic converter in all operating areas of the internal combustion engine, using the heat sources existing in the combustion circuit of the internal combustion engine.
  • the internal combustion engine according to the invention with an exhaust gas aftertreatment system and the regulation of the exhaust gas temperature of the internal combustion engine is based on the idea of the large temperature fluctuations between part-load operating ranges and full-load operating ranges and to be reduced in the cold start phase of the internal combustion engine by regulating the amount of combustion air, since the high exhaust gas temperature fluctuations and the absolute exhaust gas temperatures are directly related to a ratio of combustion air and fuel, the combustion air ratio ⁇ .
  • the highest possible temperature level of the exhaust gas temperature of the internal combustion engine should be maintained.
  • combustion air ratio ⁇ is relatively small, as is the case in the full load range of the internal combustion engine, the exhaust gas temperature rises. If the combustion air ratio ⁇ increases, as is the case when the load is reduced, the exhaust gas temperature drops. A prerequisite for this thermodynamic relationship is an optimal efficiency of the heat release of the internal combustion engine.
  • a charge air cooler can be bypassed via a bypass with a check valve to further increase the temperature level of the combustion.
  • a turbine in the exhaust line of the internal combustion engine has for optimizing the efficiency of an exhaust gas cleaning unit of the exhaust gas aftertreatment system has a variable turbine geometry and / or a bypass with a relief valve.
  • a compressor in the intake tract of the internal combustion engine has a variable compressor geometry to optimize the efficiency of the exhaust gas cleaning unit of the exhaust gas aftertreatment system.
  • the inventive method for controlling the exhaust gas temperature of the internal combustion engine according to claim 5 is characterized in that the control of the exhaust gas temperature depending on the
  • the method according to the invention is characterized in that the im
  • Combustion cycle of the internal combustion engine occurring heat sources such as the heat of the exhaust gas and the heat of the compressed air, are used to regulate the exhaust gas temperature and are regulated via a regulating and control unit as a function of the exhaust gas temperature and the combustion air ratio.
  • the method according to the invention is characterized in that a regulating and control unit receives the value of the combustion air ratio and the value of the exhaust gas temperature for each operating point of the internal combustion engine and, depending on these values, an exhaust gas recirculation valve and / or a shutoff valve for bypassing combustion air and / or a relief valve on the turbine and / or a shut-off valve for diverting the from Compressed combustion air sucked in and / or a throttle for regulating the combustion air in such a way that the minimum possible combustion air ratio ⁇ for the corresponding operating point of the internal combustion engine is achieved as a function of the exhaust gas temperature to be achieved.
  • 1 is a schematic representation of an internal combustion engine with an exhaust gas turbocharger
  • FIG. 2 shows a schematic illustration of the internal combustion engine according to FIG. 1 with a compressor which has a variable compressor inflow geometry.
  • the internal combustion engine 1 shown in FIG. 1 is assigned an exhaust gas turbocharger 2 with a turbine 3 in an exhaust line 4 and a compressor 5 in an intake tract 6.
  • the internal combustion engine 1 can be a gasoline engine or a diesel engine.
  • the turbine 3 is acted upon by the exhaust gases of the internal combustion engine 1 and drives the compressor 5 via a shaft 7, whereupon the compressor 5 draws in and compresses combustion air.
  • a charge air cooler 9 Downstream of the compressor 5, a charge air cooler 9 is provided in the intake tract 6, in which the compressed combustion air is cooled.
  • the compressed and cooled combustion air flows through a throttle 101 provided downstream of the charge air cooler, which regulates the amount of combustion air flowing into the internal combustion engine 1.
  • a bypass 14 with a shutoff valve 102 branches off downstream of the compressor 5 in front of the charge air cooler 9 and opens again into the intake tract 6 downstream of the throttle 101.
  • the turbine 3 is assigned a variable turbine geometry 8, by means of which an effective turbine inlet cross section can be variably adjusted.
  • an exhaust gas recirculation line 100 with an adjustable exhaust gas recirculation valve 19 branches off from the exhaust line 4 and opens into the intake tract 6 downstream of the throttle 101. so that, according to the invention, the temperature of the exhaust gas recirculation can be used to increase the temperature of the exhaust gas temperature.
  • a bypass 15 is provided in the exhaust line 4 upstream of the turbine 3, in which an adjustable relief valve 103 is provided.
  • the bypass 15 opens into the exhaust line 4 downstream of the turbine 3 and upstream of an exhaust gas cleaning unit 16
  • Exhaust gas cleaning unit 16 is known to be arranged in exhaust line 4 downstream of turbine 3 for exhaust gas cleaning.
  • an internal combustion engine 1 is shown, which largely corresponds in structure and in the reference character assignment of the internal combustion engine according to FIG. 1. All the same or equivalent parts have the same reference numerals of the first
  • the compressor 5 has a variable compressor inflow geometry 10 for shifting the surge limit of the compressor 5 or for operating the compressor 5 as a cold air turbine.
  • the compressor 5 is supplied with combustion air via an additional duct 17, which branches off upstream of the compressor 5 at a branch 20 from the intake tract 6.
  • a shutoff valve 12 is arranged downstream of the branch 20 of the additional channel 17 and regulates the setting of the mass flow into the additional channel 17.
  • An air flow meter 18 is located upstream of the branch 20 of the additional duct 17, with which the air flow rate is measured and fed to the regulating and control unit 11 as an information signal.
  • An air filter 13 arranged upstream of the air flow meter 18 cleans the air drawn in from the surroundings.
  • Combustion air ratio ⁇ of the internal combustion engine 1 is updated continuously.
  • the regulating and control unit 11 gives the exhaust gas recirculation valve 19, the throttle 101, the shut-off valve 102, if appropriate, in accordance with an optimal combustion air ratio ⁇ and the corresponding desired exhaust gas temperature T DNO ⁇ on the exhaust gas cleaning unit 16 Blow-off valve 103 and the variable turbine geometry 8 instruction to assume certain flow cross sections between a minimum and a maximum flow cross section.
  • the engine air quantity is set to a minimally compatible setpoint value of the combustion air ratio ⁇ and the temperature of the exhaust gas purification unit 16 is thus increased.
  • the relief valve 103 if present, is opened, or, if present, the variable turbine geometry 8 is set in such a way that boost pressure generation which is not necessary in the corresponding operating points is avoided.
  • FIG. 2 An advantageous embodiment of the internal combustion engine 1 is shown in FIG. 2.
  • the combustion air sucked in by the compressor 5 is regulated by the check valve 12 which can be regulated by the regulating and control unit 11.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Supercharger (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention relates to internal combustion engines comprising exhaust gas aftertreatment systems, a compressor arranged in the induction tract, a turbine arranged in the exhaust line, an exhaust gas recirculation line provided with an exhaust gas recirculation valve and an exhaust gas recirculation cooler, a charge-air cooler for cooling the air compressed by the compressor, a throttle for controlling the combustion air sucked in by the internal combustion engine, an exhaust gas purification unit for reducing the NOX content of the exhaust gas, and a regulating and control unit for detecting and regulating the operating states of the internal combustion engine. Additional heat sources are used to increase the exhaust gas temperature of such internal combustion engines. The inventive internal combustion engine is characterised in that uncooled exhaust gas can be supplied to the induction tract (6) from the exhaust gas recirculation line (100).

Description

DaimlerChrysler AGDaimlerChrysler AG
BRENNKRAFTMASCHINE MIT ABGASRÜCKFÜHRUNGSSYSTEM ZUM REGELN DERANSAUGTEMPERATURINTERNAL COMBUSTION ENGINE WITH EXHAUST GAS RECIRCULATION SYSTEM FOR CONTROLLING THE SUCTION TEMPERATURE
Die Erfindung betrifft eine Brennkraftmaschine mit einem Abgasnachbehandlungssystem und ein Verfahren zur Regelung der Abgastemperatur nach dem Oberbegriff des Anspruches 1 bzw. des Anspruchs 5.The invention relates to an internal combustion engine with an exhaust gas aftertreatment system and a method for controlling the exhaust gas temperature according to the preamble of claim 1 and claim 5.
Grundsätzlich ist bekannt, dass ein hoherBasically, it is known that a high
Umsetzungswirkungsgrad der Stickoxidreduzierung in einem SCR- Katalysator bei Abgastemperaturen in einem Bereich von etwa 250°- 550° Celsius erzielt wird. Eine Brennkraftmaschine dagegen weist Abgastemperaturen sowohl im Teillastbereich als auch in der Kaltstartphase von unter 250° Celsius auf. Aus Bauraumgründen befindet sich der SCR-Katalysator in der Regel nicht direkt am Auslassventil der Brennkraf maschine, so dass eine weitere Reduzierung der Abgastemperatur über Wandwärmeverluste in den Abgasrohrleitungen erfolgt . Bei Einsatz eines Abgasturboladers befindet sich der SCR- Katalysator stromab der Turbine und es erfolgt eine weitere Abgastemperaturreduzierung aufgrund des thermodynamisehen Prozesses in der Turbine. Die niedrigen Abgastemperaturen, die in den genannten Betriebsbreichen auftreten, gilt es zu erhöhe . In der Druckschrift DE 102 49 880 AI wird eine Emissionssteuerungsvorrichtung und ein Emissionssteuerverfahren einer Brennkraftmaschine beschrieben, wobei die Emissionssteuervorrichtung der Brennkraftmaschine einen NOx-Katalysator, eine Aufwärmeinrichtung zum Erwärmen des NOx-Katalysators und eine Betriebszustandserfassungseinrichtung zum Erfassen des Betriebszustandes der Brennkraftmaschine umfasst . Die Aufwärmeinrichtung der Emissionssteuervorrichtung wird je nach Betriebspunkt der Brennkraftmaschine derart eingesetzt, dass entweder der eingespritzte Kraftstoff in dem NOx- Katalysator oxidiert wird und aufgrund der durch die Oxidation erzeugten Wärme die Temperatur des NOx-Katalysators angehoben wird oder der eingespritzte Kraftstoff reduziert die Sauerstoffkonzentration des Abgasmassenstromes und führt eine Reduktion der Stickoxide im Filter herbei. Ein Nachteil der Emissionssteuervorrichtung ist ein zusätzlicher Einbau einer Kraftstoffleitung mit einem Absehalt entil sowie der Einbau eines Einspritzventils in den Auslasskrümmer .Implementation efficiency of nitrogen oxide reduction in an SCR catalytic converter is achieved at exhaust gas temperatures in a range from approximately 250 ° to 550 ° Celsius. An internal combustion engine, on the other hand, has exhaust gas temperatures of less than 250 ° Celsius both in the partial load range and in the cold start phase. For reasons of installation space, the SCR catalytic converter is generally not located directly at the exhaust valve of the internal combustion engine, so that the exhaust gas temperature is further reduced by means of wall heat losses in the exhaust gas pipes. When using an exhaust gas turbocharger, the SCR catalytic converter is located downstream of the turbine and there is a further reduction in exhaust gas temperature due to the thermodynamic process in the turbine. The low exhaust gas temperatures that occur in the named operating ranges have to be increased. The publication DE 102 49 880 AI describes an emission control device and an emission control method of an internal combustion engine, the emission control device of the internal combustion engine comprising a NO x catalytic converter, a warming-up device for heating the NO x catalytic converter and an operating state detection device for detecting the operating state of the internal combustion engine. Depending on the operating point of the internal combustion engine, the heating device of the emission control device is used in such a way that either the injected fuel is oxidized in the NO x catalyst and the temperature of the NO x catalyst is raised due to the heat generated by the oxidation, or the injected fuel reduces the oxygen concentration of the exhaust gas mass flow and brings about a reduction in the nitrogen oxides in the filter. A disadvantage of the emission control device is an additional installation of a fuel line with a retentive valve and the installation of an injection valve in the exhaust manifold.
Der Erfindung liegt das Problem zugrunde, in allen Betriebsbereichen der Brennkraftmaschine einen hohen Wirkungsgrad des SCR-Katalysators zu erzielen, unter Nutzung der im Verbrennungskreislauf der Brennkraftmaschine existierenden Wärmequellen.The invention is based on the problem of achieving a high efficiency of the SCR catalytic converter in all operating areas of the internal combustion engine, using the heat sources existing in the combustion circuit of the internal combustion engine.
Dieses Problem wird erfindungsgemäß mit den Merkmalen des Anspruchs 1 gelöst .This problem is solved according to the invention with the features of claim 1.
Die erfindungsgemäße Brennkraftmaschine mit einem Abgasnachbehandlungssystem und die Regelung der Abgastemperatur der Brennkraftmaschine basiert auf dem Gedanken, die großen Temperaturschwankungen zwischen Teillastbetriebsbereichen und Volllastbetriebsbereichen und in der Kaltstartphase der Brennkraftmaschine über eine Regelung der Verbrennungsluftmenge zu reduzieren, da die hohen Abgastemperaturschwankungen und die absoluten Abgastemperaturen in direktem Zusammenhang mit einem Verhältnis aus Verbrennungsluft und Kraftstoff, dem Verbrennungsluftverhältnis λ, stehen. Dabei soll ein möglichst hohes Temperaturniveau der Abgastemperatur der Brennkraftmaschine gehalten werden.The internal combustion engine according to the invention with an exhaust gas aftertreatment system and the regulation of the exhaust gas temperature of the internal combustion engine is based on the idea of the large temperature fluctuations between part-load operating ranges and full-load operating ranges and to be reduced in the cold start phase of the internal combustion engine by regulating the amount of combustion air, since the high exhaust gas temperature fluctuations and the absolute exhaust gas temperatures are directly related to a ratio of combustion air and fuel, the combustion air ratio λ. The highest possible temperature level of the exhaust gas temperature of the internal combustion engine should be maintained.
Ist das Verbrennungsluftverhältnis λ relativ klein, wie es im Volllastbereich der Brennkraftmaschine der Fall ist, steigt die Abgastemperatur. Steigt das Verbrennungsluftverhältnis λ, wie es bei Senkung der Last der Fall ist, sinkt die Abgastemperatur. Voraussetzung für diesen thermodynamisehen Zusammenhang ist dabei ein optimaler Wirkungsgrad der Wärmefreisetzung der Brennkraftmaschine.If the combustion air ratio λ is relatively small, as is the case in the full load range of the internal combustion engine, the exhaust gas temperature rises. If the combustion air ratio λ increases, as is the case when the load is reduced, the exhaust gas temperature drops. A prerequisite for this thermodynamic relationship is an optimal efficiency of the heat release of the internal combustion engine.
Eine Rückführung ungekühlten Abgases über eine Abgasruckfuhrleitung in den Ansaugtrakt derA return of uncooled exhaust gas via an exhaust gas return line to the intake of the
Brennkraftmaschine führt zu einer Reduzierung der angesaugten Verbrennungsluft und, da das Abgas ungekühlt ist, zu einer Erhöhung des Temperaturniveaus der Verbrennung und damit, bei unverändertem Brennbeginn der Verbrennung, zu einer Erhöhung der Abgastemperatur.Internal combustion engine leads to a reduction in the intake of combustion air and, since the exhaust gas is uncooled, to an increase in the temperature level of the combustion and thus, with the combustion start of combustion unchanged, to an increase in the exhaust gas temperature.
In einer vorteilhaften Ausgestaltung der erfindungsgemäßen Brennkraftmaschine nach Anspruch 2 ist zur weiteren Erhöhung des Temperaturniveaus der Verbrennung ein Ladeluftkühler über einen Bypass mit einem Sperrventil bypassierbar.In an advantageous embodiment of the internal combustion engine according to the invention, a charge air cooler can be bypassed via a bypass with a check valve to further increase the temperature level of the combustion.
In einer weiteren vorteilhaften Ausgestaltung der erfindungsgemäßen Brennkraftmaschine nach Anspruch 3 weist eine Turbine im Abgasstrang der Brennkraftmaschine zur Optimierung des Wirkungsgrades einer Abgasreinigungseinheit des Abgasnachbehandlungssystems eine variable Turbinengeometrie und/oder einen Bypass mit einem Abblaseventil auf.In a further advantageous embodiment of the internal combustion engine according to the invention, a turbine in the exhaust line of the internal combustion engine has for optimizing the efficiency of an exhaust gas cleaning unit of the exhaust gas aftertreatment system has a variable turbine geometry and / or a bypass with a relief valve.
In einer weiteren vorteilhaften Ausgestaltung der erfindungsgemäßen Brennkraftmaschine nach Anspruch 4 weist ein Verdichter im Ansaugtrakt der Brennkraftmaschine zur Optimierung des Wirkungsgrades der Abgasreinigungseinheit des Abgasnachbehandlungssystems eine variable Verdichtergeometrie auf .In a further advantageous embodiment of the internal combustion engine according to claim 4, a compressor in the intake tract of the internal combustion engine has a variable compressor geometry to optimize the efficiency of the exhaust gas cleaning unit of the exhaust gas aftertreatment system.
Das erfindungsgemäße Verfahren zur Regelung der Abgastemperatur der Brennkraftmaschine nach Anspruch 5 zeichnet sich dadurch aus, dass die Regelung der Abgastemperatur in Abhängigkeit desThe inventive method for controlling the exhaust gas temperature of the internal combustion engine according to claim 5 is characterized in that the control of the exhaust gas temperature depending on the
Verbrennungsluftverhältnisses λ erfolgt.Combustion air ratio λ takes place.
Des Weiteren zeichnet sich das erfindungsgemäße Verfahren nach Anspruch 6 dadurch aus, dass die imFurthermore, the method according to the invention is characterized in that the im
Verbrennungskreislauf der Brennkraftmaschine auftretenden Wärmequellen, wie zum Beispiel die Wärme des Abgases und die Wärme der verdichteten Luft, zur Regelung der Abgastemperatur genutzt werden und über eine Regel- und Steuereinheit in Abhängigkeit der Abgastemperatur und des Verbrennungsluftverhältnisses geregelt werden.Combustion cycle of the internal combustion engine occurring heat sources, such as the heat of the exhaust gas and the heat of the compressed air, are used to regulate the exhaust gas temperature and are regulated via a regulating and control unit as a function of the exhaust gas temperature and the combustion air ratio.
Des Weiteren zeichnet sich das erfindungsgemäße Verfahren nach Anspruch 7 dadurch aus, dass eine Regel- und Steuereinheit zu jedem Betriebspunkt der Brennkraftmaschine den Wert des Verbrennungsluftverhältnisses und den Wert der Abgastemperatur erhält und in Abhängigkeit dieser Werte ein Abgasrückführventil und/oder ein Sperrventil zur Bypassierung von Verbrennungsluft und/oder ein Abblaseventil an der Turbine und/oder ein Sperrventil zur Umleitung der vom Verdichter angesaugten Verbrennungsluft und/oder eine Drossel zur Regulierung der Verbrennungsluft derart regelt, dass das für den entsprechenden Betriebspunkt der Brennkraftmaschine minimal mögliche Verbrennungsluftverhältnis λ in Abhängigkeit der zu erzielenden Abgastemperatur erreicht wird.Furthermore, the method according to the invention is characterized in that a regulating and control unit receives the value of the combustion air ratio and the value of the exhaust gas temperature for each operating point of the internal combustion engine and, depending on these values, an exhaust gas recirculation valve and / or a shutoff valve for bypassing combustion air and / or a relief valve on the turbine and / or a shut-off valve for diverting the from Compressed combustion air sucked in and / or a throttle for regulating the combustion air in such a way that the minimum possible combustion air ratio λ for the corresponding operating point of the internal combustion engine is achieved as a function of the exhaust gas temperature to be achieved.
Weitere Vorteile und zweckmäßige Ausführungen sind in den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Dabei zeigen:Further advantages and expedient designs can be found in the further claims, the description of the figures and the drawings. Show:
Fig. 1 eine schematische Darstellung einer Brennkraftmaschine mit Abgasturbolader,1 is a schematic representation of an internal combustion engine with an exhaust gas turbocharger,
Fig. 2 eine schematische Darstellung der Brennkraftmaschine nach Fig. 1 mit einem Verdichter, der eine variable Verdichtereinströmgeometrie aufweist .FIG. 2 shows a schematic illustration of the internal combustion engine according to FIG. 1 with a compressor which has a variable compressor inflow geometry.
Der in Fig. 1 dargestellten Brennkraftmaschine 1 ist ein Abgasturbolader 2 mit einer Turbine 3 in einem Abgasstrang 4 und ein Verdichter 5 in einem Ansaugtrakt 6 zugeordnet . Bei der Brennkraftmaschine 1 kann es sich um einen Ottomotor oder um einen Dieselmotor handeln. Die Turbine 3 wird von den Abgasen der Brennkraftmaschine 1 beaufschlagt und treibt den Verdichter 5 über eine Welle 7 an, woraufhin der Verdichter 5 Verbrennungsluft ansaugt und verdichtet .The internal combustion engine 1 shown in FIG. 1 is assigned an exhaust gas turbocharger 2 with a turbine 3 in an exhaust line 4 and a compressor 5 in an intake tract 6. The internal combustion engine 1 can be a gasoline engine or a diesel engine. The turbine 3 is acted upon by the exhaust gases of the internal combustion engine 1 and drives the compressor 5 via a shaft 7, whereupon the compressor 5 draws in and compresses combustion air.
Stromab des Verdichters 5 ist im Ansaugtrakt 6 ein Ladeluftkühler 9 vorgesehen, in welchem die verdichtete Verbrennungsluft gekühlt wird. Die verdichtete und gekühlte Verbrennungsluft strömt durch eine stromab des Ladeluftkühlers vorgesehene Drossel 101, welche die Menge der in die Brennkraftmaschine 1 einströmenden Verbrennungsluft regelt . Zur Umgehung des Ladeluftkühlers 9 zweigt stromab des Verdichters 5 vor dem Ladeluftkühler 9 ein Bypass 14 mit einem Sperrventil 102 ab und mündet stromab der Drossel 101 wieder in den Ansaugtrakt 6.Downstream of the compressor 5, a charge air cooler 9 is provided in the intake tract 6, in which the compressed combustion air is cooled. The compressed and cooled combustion air flows through a throttle 101 provided downstream of the charge air cooler, which regulates the amount of combustion air flowing into the internal combustion engine 1. To bypass the charge air cooler 9, a bypass 14 with a shutoff valve 102 branches off downstream of the compressor 5 in front of the charge air cooler 9 and opens again into the intake tract 6 downstream of the throttle 101.
Der Turbine 3 ist eine variable Turbinengeometrie 8 zugeordnet, über die ein wirksamer Turbineneintrittsquerschnitt veränderlich einstellbar ist.The turbine 3 is assigned a variable turbine geometry 8, by means of which an effective turbine inlet cross section can be variably adjusted.
Stromauf der Turbine 3 zweigt vom Abgasstrang 4 eine Abgasruckfuhrleitung 100 mit einem einstellbaren Abgasrückführventil 19 ab und mündet stromab der Drossel 101 in den Ansaugtrakt 6. Würde in einer Abwandlung beispielsweise die Abgasruckfuhrleitung 100 einen Abgasrückführkühler aufweisen, so wäre ein Bypass um den Abgasrückführkühler zu legen, damit erfindungsgemäß die Temperatur der Abgasrückführung zur Temperaturerhöhung der Abgastemperatur genutzt werden kann.Upstream of the turbine 3, an exhaust gas recirculation line 100 with an adjustable exhaust gas recirculation valve 19 branches off from the exhaust line 4 and opens into the intake tract 6 downstream of the throttle 101. so that, according to the invention, the temperature of the exhaust gas recirculation can be used to increase the temperature of the exhaust gas temperature.
Zur Umgehung der Turbine 3 ist im Abgasstrang 4 stromauf der Turbine 3 ein Bypass 15 vorgesehen, in welchem ein einstellbares Abblaseventil 103 vorgesehen ist. Der Bypass 15 mündet in den Abgasstrang 4 stromab der Turbine 3 und stromauf einer Abgasreinigungseinheit 16. DieTo bypass the turbine 3, a bypass 15 is provided in the exhaust line 4 upstream of the turbine 3, in which an adjustable relief valve 103 is provided. The bypass 15 opens into the exhaust line 4 downstream of the turbine 3 and upstream of an exhaust gas cleaning unit 16
Abgasreinigungseinheit 16 ist bekanntermaßen im Abgasstrang 4 stromab der Turbine 3 zur Abgasreinigung angeordnet .Exhaust gas cleaning unit 16 is known to be arranged in exhaust line 4 downstream of turbine 3 for exhaust gas cleaning.
Über eine Regel- und Steuereinheit 11 werden diverse Aggregate der Brennkraftmaschine 1, insbesondere das Abgasrückführventil 19, die Drossel 101, das Sperrventil 102, das Abblaseventil 103 und die variable Turbinengeometrie 8 in Abhängigkeit von Zustands- und Betriebsgrößen der Brennkraftmaschine 1, insbesondere dem Verbrennungsluftverhältnis λ und der Abgastemperatur TDNOχ an der Abgasreinigungseinheit 16, eingestellt.Various units of the internal combustion engine 1, in particular the exhaust gas recirculation valve 19, the throttle 101, the shut-off valve 102, the relief valve 103 and the variable turbine geometry 8, are dependent on the state and operating variables of the internal combustion engine 1, in particular the control unit 11 Combustion air ratio λ and the exhaust gas temperature T DNO χ on the exhaust gas purification unit 16.
In einem zweiten Ausführungsbeispiel nach Fig. 2 ist eine Brennkraftmaschine 1 dargestellt, die weitestgehend im Aufbau und in der Bezugszeichenzuordnung der Brennkraftmaschine nach Fig. 1 entspricht. Alle gleichen oder gleichwirkenden Teile sind mit denselben Bezugszeichen des erstenIn a second exemplary embodiment according to FIG. 2, an internal combustion engine 1 is shown, which largely corresponds in structure and in the reference character assignment of the internal combustion engine according to FIG. 1. All the same or equivalent parts have the same reference numerals of the first
Ausführungsbeispiels gekennzeichnet. Der Verdichter 5 weist eine variable Verdichtereinströmgeometrie 10 zur Verschiebung der Pumpgrenze des Verdichters 5 bzw. zum Betrieb des Verdichters 5 als Kaltluftturbine auf. Dabei wird über einen Zusatzkanal 17, der stromauf des Verdichters 5 an einer Abzweigung 20 vom Ansaugtrakt 6 abzweigt, der Verdichter 5 mit Verbrennungsluft versorgt.Designated embodiment. The compressor 5 has a variable compressor inflow geometry 10 for shifting the surge limit of the compressor 5 or for operating the compressor 5 as a cold air turbine. In this case, the compressor 5 is supplied with combustion air via an additional duct 17, which branches off upstream of the compressor 5 at a branch 20 from the intake tract 6.
Stromab der Abzweigung 20 des Zusatzkanals 17 ist ein Sperrventil 12 angeordnet, welches die Einstellung des Massenstromes in den Zusatzkanal 17 regelt. Stromauf der Abzweigung 20 des Zusatzkanals 17 befindet sich ein Luftmengenmesser 18, mit dem der Luftdurchsatz gemessen und als Informationssignal der Regel- und Steuereinheit 11 zugeführt wird. Ein stromauf des Luftmengenmessers 18 angeordneter Luftfilter 13 reinigt die aus der Umgebung angesaugte Luft .A shutoff valve 12 is arranged downstream of the branch 20 of the additional channel 17 and regulates the setting of the mass flow into the additional channel 17. An air flow meter 18 is located upstream of the branch 20 of the additional duct 17, with which the air flow rate is measured and fed to the regulating and control unit 11 as an information signal. An air filter 13 arranged upstream of the air flow meter 18 cleans the air drawn in from the surroundings.
Die der Regel- und Steuereinheit 11 übermittelte Temperatur TDNOX der Abgasreinigungseinheit 16 und dasThe temperature T DNOX of the exhaust gas cleaning unit 16 transmitted to the regulating and control unit 11 and that
Verbrennungsluftverhältnis λ der Brennkraftmaschine 1 werden kontinuierlich aktualisiert. Die Regel- und Steuereinheit 11 gibt entsprechend einem optimalen Verbrennungsluftverhältnis λ und der entsprechenden gewünschten Abgastemperatur TDNOχ an der Abgasreinigungseinheit 16 dem Abgasrückführventil 19, der Drossel 101, dem Sperrventil 102, gegebenenfalls dem /Abblaseventil 103 und der variablen Turbinengeometrie 8 Anweisung bestimmte Strömungsquerschnitte zwischen einem minimalen und einem maximalen Strömungsquerschnitt einzunehmen. Durch die Regelung einer ungekühlten Abgasrückführmenge über das Abgasrückführventil 19 und der entsprechenden Einstellung der anderen zu regelnden Absperrorgane wird die Motorluftmenge auf einen minimal verträglichen Sollwert des Verbrennungsluftverhältnisses λ eingestellt und damit die Temperaturanhebung der Abgasreinigungseinheit 16 erreicht .Combustion air ratio λ of the internal combustion engine 1 is updated continuously. The regulating and control unit 11 gives the exhaust gas recirculation valve 19, the throttle 101, the shut-off valve 102, if appropriate, in accordance with an optimal combustion air ratio λ and the corresponding desired exhaust gas temperature T DNO χ on the exhaust gas cleaning unit 16 Blow-off valve 103 and the variable turbine geometry 8 instruction to assume certain flow cross sections between a minimum and a maximum flow cross section. By regulating an uncooled exhaust gas recirculation quantity via the exhaust gas recirculation valve 19 and the corresponding setting of the other shut-off elements to be regulated, the engine air quantity is set to a minimally compatible setpoint value of the combustion air ratio λ and the temperature of the exhaust gas purification unit 16 is thus increased.
Zur Vermeidung einer Androsselung im Ansaugtrakt 6 und im Abgasstrang 4, bzw. zur Reduzierung der Ladungswechselverluste, wird, falls vorhanden, das Abblaseventil 103 geöffnet, oder, falls vorhanden, die variable Turbinengeometrie 8 derart eingestellt, dass eine in den entsprechenden Betriebspunkten nicht notwendige Ladedruckerzeugung vermieden wird.To avoid throttling in the intake tract 6 and in the exhaust line 4, or to reduce the charge exchange losses, the relief valve 103, if present, is opened, or, if present, the variable turbine geometry 8 is set in such a way that boost pressure generation which is not necessary in the corresponding operating points is avoided.
Ist dennoch eine Ladedruckerzeugung unvermeidbar, muss im Ansaugtrakt 6 die angesaugte Verbrennungsluft gedrosselt werden.If boost pressure generation is nevertheless unavoidable, the intake combustion air must be throttled in intake tract 6.
Durch die Drosselung der Verbrennungsluftmenge nach dem Verdichter 5 über das Sperrventil 102 und gegebenenfalls über die Drossel 101, kann möglicherweise die Pumpgrenze des Verdichters 5 überschritten werden. Eine vorteilhafte Ausführung der Brennkraftmaschine 1 ist dazu in Fig. 2 dargestellt. Die vom Verdichter 5 angesaugte Verbrennungsluft wird über das von der Regel- und Steuereinheit 11 regelbare Sperrventil 12 geregelt . By throttling the amount of combustion air downstream of the compressor 5 via the check valve 102 and possibly via the throttle 101, the pump limit of the compressor 5 may possibly be exceeded. An advantageous embodiment of the internal combustion engine 1 is shown in FIG. 2. The combustion air sucked in by the compressor 5 is regulated by the check valve 12 which can be regulated by the regulating and control unit 11.

Claims

DaimlerChrysler AGPatentansprüche DaimlerChrysler AG patent claims
1. Brennkraftmaschine mit Abgasnachbehandlungssystem, mit einem Verdichter im Ansaugtrakt und einer Turbine im Abgasstrang, einer Abgasruckfuhrleitung mit einem Abgasrückführventil und einem Abgasrückführkühler, einem Ladeluftkühler zur Kühlung der vom Verdichter verdichteten Luft, einer Drossel zur Steuerung der von der Brennkraftmaschine angesaugten Verbrennungsluft , einer Abgasreinigungseinheit zur Reduzierung des NOx- Gehaltes des Abgases und einer Regel- und Steuereinheit zum Erfassen und Regeln der Betriebszustände der Brennkraftmaschine, dadurch gekennzeichnet, dass dem Ansaugtrakt (6) ungekühltes Abgas aus der Abgasruckfuhrleitung (100) zuführbar ist.1.Internal combustion engine with exhaust gas aftertreatment system, with a compressor in the intake tract and a turbine in the exhaust system, an exhaust gas return line with an exhaust gas recirculation valve and an exhaust gas recirculation cooler, a charge air cooler for cooling the air compressed by the compressor, a throttle for controlling the combustion air drawn in by the internal combustion engine, and an exhaust gas cleaning unit for Reduction of the NO x content of the exhaust gas and a regulating and control unit for detecting and regulating the operating states of the internal combustion engine, characterized in that uncooled exhaust gas can be fed to the intake tract (6) from the exhaust gas return line (100).
2. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, dass im Ansaugtrakt (6) ein Bypass (14) mit einem Sperrventil (102) zur Bypassierung des Ladeluftkühlers (9) vorgesehen ist.2. Internal combustion engine according to claim 1, characterized in that a bypass (14) with a check valve (102) for bypassing the charge air cooler (9) is provided in the intake tract (6).
3. Brennkraftmaschine nach Anspruch 1 oder 2 , dadurch gekennzeichnet, dass zur Optimierung des Wirkungsgrades der Abgasreinigungseinheit (16) die Turbine (3) eine variable Turbinengeometrie (8) und/oder einen Bypass (15) mit einem Abblaseventil (103) aufweist.3. Internal combustion engine according to claim 1 or 2, characterized in that to optimize the efficiency of the Exhaust gas cleaning unit (16), the turbine (3) has a variable turbine geometry (8) and / or a bypass (15) with a blow-off valve (103).
4. Brennkraftmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass zur Optimierung des Wirkungsgrades der Abgasreinigungseinheit (16) der Verdichter (5) eine variable Verdichtergeometrie (10) aufweist.4. Internal combustion engine according to one of claims 1 to 3, characterized in that to optimize the efficiency of the exhaust gas purification unit (16), the compressor (5) has a variable compressor geometry (10).
5. Verfahren zur Regelung der Abgastemperatur einer Brennkraftmaschine, mit einem Verdichter im Ansaugtrakt und einer Turbine im Abgasstrang, einer Abgasruckfuhrleitung mit einem Abgasrückführventil und einem Abgasrückführkühler, einem Ladeluftkühler zur Kühlung der vom Verdichter verdichteten Luft, einer Drossel zur Steuerung der von der Brennkraftmaschine angesaugten Verbrennungsluft, einem zur Reduzierung des NOx-Gehaltes des Abgases und einer Regel- und Steuereinheit zum Erfassen und Regeln der Betriebszustände der Brennkraftmaschine, dadurch gekennzeichnet, dass die Abgastemperatur TDNOχ an der Abgasreinigungseinheit (16) in Abhängigkeit des Verbrennungsluftverhältnisses λ der Brennkraftmaschine (1) geregelt wird, wobei dem Ansaugtrakt (6) ungekühltes Abgas aus der Abgasruckfuhrleitung (100) zugeführt wird.5.Method for controlling the exhaust gas temperature of an internal combustion engine, with a compressor in the intake tract and a turbine in the exhaust system, an exhaust gas return line with an exhaust gas recirculation valve and an exhaust gas recirculation cooler, a charge air cooler for cooling the air compressed by the compressor, a throttle for controlling the combustion air drawn in by the internal combustion engine , one for reducing the NO x content of the exhaust gas and a regulating and control unit for detecting and regulating the operating states of the internal combustion engine, characterized in that the exhaust gas temperature T DNO χ at the exhaust gas cleaning unit (16) as a function of the combustion air ratio λ of the internal combustion engine (1 ) is regulated, the intake tract (6) being supplied with uncooled exhaust gas from the exhaust gas recirculation line (100).
6. Verfahren nach Anspruch 5 , dadurch gekennzeichnet, dass die im Verbrennungskreislauf der Brennkraftmaschine (1) auftretenden Wärmequellen zur Regelung der Abgastemperatur TDNOχ genutzt werden und über eine Regel- und Steuereinheit in Abhängigkeit der Abgastemperatur TDNOX und des Verbrennungsluftverhältnisses λ geregelt werden.6. The method according to claim 5, characterized in that the heat sources occurring in the combustion circuit of the internal combustion engine (1) are used for regulating the exhaust gas temperature T DNO χ and via a regulating and control unit as a function of the exhaust gas temperature T DNOX and the combustion air ratio λ can be regulated.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Regel- und Steuereinheit (11) zu jedem Betriebspunkt der Brennkraftmaschine (1) den Wert des Verbrennungsluftverhältnisses λ und den Wert der Abgastemperatur TDN0X erhält und in Abhängigkeit dieser Werte das Abgasrückführventil (19) und/oder das Sperrventil (102) und/oder das Abblaseventil (103) und/oder das Sperrventil (12) und/oder die Drossel (101) derart regelt, dass das für den entsprechenden Betriebspunkt der Brennkraftmaschine (1) minimal mögliche Verbrennungsluftverhältnis λ in Abhängigkeit der Abgastemperatur erreicht wird. 7. The method according to claim 6, characterized in that the regulating and control unit (11) receives the value of the combustion air ratio λ and the value of the exhaust gas temperature T DN0X for each operating point of the internal combustion engine (1) and the exhaust gas recirculation valve (19) as a function of these values. and / or the shut-off valve (102) and / or the relief valve (103) and / or the shut-off valve (12) and / or the throttle (101) controls such that the minimum possible combustion air ratio λ for the corresponding operating point of the internal combustion engine (1) depending on the exhaust gas temperature is reached.
PCT/EP2005/005717 2004-06-02 2005-05-27 Internal combustion engine comprising an exhaust gas recirculation system for regulating the suction temperature WO2005119036A1 (en)

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