EP1672208A2 - Exhaust gas recirculation system - Google Patents
Exhaust gas recirculation system Download PDFInfo
- Publication number
- EP1672208A2 EP1672208A2 EP05112094A EP05112094A EP1672208A2 EP 1672208 A2 EP1672208 A2 EP 1672208A2 EP 05112094 A EP05112094 A EP 05112094A EP 05112094 A EP05112094 A EP 05112094A EP 1672208 A2 EP1672208 A2 EP 1672208A2
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- EP
- European Patent Office
- Prior art keywords
- pressure
- low
- exhaust gas
- line
- supply line
- 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.)
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- 238000002485 combustion reaction Methods 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 46
- 238000001816 cooling Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
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- 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
- F02M26/34—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with compressors, turbines or the like in the recirculation passage
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- 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
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- 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
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
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- 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
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- 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
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
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- 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
Definitions
- the invention relates to an exhaust gas recirculation system for an internal combustion engine, in particular a diesel engine.
- a typical exhaust gas recirculation system includes a piping system that leads from an inlet via an internal combustion engine to an exhaust.
- the exhaust gas recirculation system has a low-pressure supply line leading from an inlet to a compressor. From the compressor to the internal combustion engine performs a high-pressure Zumonirieitung to supply the intake at the inlet fresh air of the internal combustion engine, in particular an internal combustion engine. After combustion in the internal combustion engine, the exhaust gas produced in the internal combustion engine is discharged via a high-pressure exhaust gas line from the internal combustion engine to a turbine. From the turbine, the exhaust gas passes through a low-pressure exhaust pipe to an outlet.
- a low-pressure feedback line connected to the low-pressure exhaust line and the low-pressure supply line which supplies a part of the exhaust gas to the low-pressure supply line, whereby a part of the exhaust gas is returned.
- a disadvantage of such an exhaust gas recirculation system is that by means of throttle valves, for example in the low-pressure exhaust pipe a Back pressure must be generated so that an unintentional short-circuit flow is prevented from the inlet via the low-pressure feedback line to the outlet.
- throttle valves for example in the low-pressure exhaust pipe a Back pressure must be generated so that an unintentional short-circuit flow is prevented from the inlet via the low-pressure feedback line to the outlet.
- a backpressure unnecessary counterpressure for the turbine and possibly for the compressor which affects the efficiency of the turbine and the compressor. This leads to an increase in the charge exchange work, whereby the motor efficiency is impaired.
- the object of the invention is to provide an exhaust gas recirculation system in which an impairment of the engine efficiency is reduced.
- the exhaust gas recirculation system according to the invention for an internal combustion engine which is in particular a diesel engine, has a low-pressure supply line leading from an inlet to a compressor. From the compressor to the internal combustion engine performs a high pressure supply line. From the engine to a turbine, a high pressure exhaust conduit leads, followed by a low pressure exhaust conduit leading from the turbine to an exhaust. With the low-pressure exhaust pipe and the low-pressure supply line, a low-pressure feedback line is connected, which has a low-pressure pump according to the invention.
- a low-pressure pump is understood to mean a pump which is arranged in the low-pressure feedback line and not a pump which can only provide low pressure differences.
- the low-pressure pump which is in particular a flow pump, a compressor or the like
- exhaust gas is pumped from the low-pressure exhaust line into the low-pressure supply line, so that part of the exhaust gas is recirculated.
- the Low pressure pump is provided for almost any operating points the required pressure difference to promote a defined amount of exhaust gas from the low-pressure exhaust pipe to the low-pressure supply, so that a throttle, a throttle valve or the like.
- the pressure in the low-pressure exhaust pipe substantially correspond to the ambient pressure, so that at the output of the turbine as low as possible pressure is applied, whereby the efficiency of the turbine is improved. Due to the improved efficiency of the turbine, the engine efficiency, ie the efficiency of the internal combustion engine including the turbine and the compressor, is improved.
- the low-pressure pump can be regulated in terms of quantity so that it is possible to regulate the volume per unit of time or the mass per unit of time of the exhaust gas to be recirculated and adapt it to the current conditions in the internal combustion engine.
- a filter element in particular a particle filter, for example for diesel particles, is provided in the low-pressure exhaust gas line.
- the filter element is arranged, in particular, before the connection of the low-pressure exhaust gas line to the low-pressure feedback line, so that the recirculated exhaust gas is filtered. This avoids that possibly inconvenient, solid Combustion residues of the internal combustion engine are supplied. Furthermore, contamination of the compressor is avoided by combustion residues.
- an exhaust gas treatment device is provided in the flow direction of the exhaust gas after the connection of the low-pressure exhaust pipe with the low-pressure feedback line, by the example, the emission of nitrogen oxides NO x is reduced.
- the low pressure exhaust pipe further includes a check valve to prevent fresh air from the low pressure pump is pumped via the outlet in the low pressure supply line.
- the exhaust gas recirculation system further comprises a high-pressure return line connected to the high-pressure exhaust line and the high-pressure supply line, which preferably has a high-pressure pump.
- a high-pressure pump is understood to mean a pump which is arranged in the high-pressure return line and not a pump which can only provide high pressure differences.
- the high-pressure pump makes it possible to recirculate hot exhaust gas, in particular during the cold start phase of the internal combustion engine, in order to be able to operate the internal combustion engine as quickly as possible at the optimum operating point. Due to the high pressure pump, the arrangement of a throttle valve or a throttle valve in the high pressure supply line can be avoided, so that the efficiency of the compressor is improved. Possibly. is provided in the high pressure supply line and / or in the low pressure exhaust pipe, an exhaust gas recirculation valve for flow control.
- the low-pressure exhaust pipe and / or the high-pressure supply line has no throttle, so that the exhaust gas or the fresh air is fed unthrottled through the low-pressure exhaust pipe or the high pressure supply line.
- the low pressure exhaust pipe and the high pressure supply line are thus unthrottled connected. Possibly. can the unthrottled connected high-pressure supply line having a charge air cooler.
- the low-pressure exhaust pipe may optionally have the check valve and / or the exhaust gas treatment device. Further an additional pressure loss causing devices are thus preferably not provided.
- Fig. 1 is a schematic representation of the exhaust gas recirculation system according to the invention.
- the exhaust gas recirculation system has an inlet 10, which is connected to a compressor 14 via a low-pressure supply line 12, so that fresh air is conveyed from the inlet 10 in the direction of the arrow 16.
- a high-pressure supply line 18 leads to an internal combustion engine 20, which is, for example, a four-cylinder diesel engine.
- an internal combustion engine 20 which is, for example, a four-cylinder diesel engine.
- a high pressure exhaust pipe 22 leads to a turbine 24.
- the turbine 24 and the compressor 14 are connected to each other in the illustrated embodiment to form a turbocharger.
- the turbine 24 is adjoined by a low-pressure exhaust gas line 26, which conveys the exhaust gas of the internal combustion engine 20 in the direction of an arrow 28 to an outlet 30.
- the low-pressure exhaust gas line 26 is connected to the low-pressure supply line 12 via a low-pressure return line 32.
- the low-pressure feedback line has a low-pressure pump 34.
- the low pressure pump 34 By the low pressure pump 34, a portion of the exhaust gas from the low pressure exhaust pipe 26 is pumped into the low pressure supply line 12. As a result, the flow in the low-pressure exhaust gas conduit 26 can take place without throttling, ie an exhaust gas valve or the like is not in the low-pressure exhaust gas conduit 26 required.
- the low-pressure pump 34 optionally pumps in addition a portion of the exhaust gas from the low pressure exhaust pipe 26 into the high pressure supply line 18th
- a cooler 36 may be provided for the recirculated exhaust gas, which cools the hot exhaust gas in particular after the cold start phase of the internal combustion engine 20 to avoid excessive temperatures of the fresh air supplied to the compressor 14.
- the high-pressure supply line 18 may have a charge air cooler 38, in order to possibly completely or partially reverse the heating of the fresh air which takes place in the compressor 14. With the help of the radiator 36 and the intercooler 38, the temperature of the fresh air in the high-pressure supply line 18 can be adjusted as needed.
- the exhaust gas recirculation system further includes a high pressure return line 40 which pumps exhaust from the high pressure exhaust line 22 to the high pressure supply line 18 via a high pressure pump 42.
- the high-pressure pump 42 may be arranged in the high-pressure supply line 18, in particular in the flow direction behind the feed point of the high-pressure return line 40.
- the low-pressure pump 34 and the high-pressure pump 42 can be operated mechanically.
- the pumps 34, 42 are electrically operated, so that the motor efficiency is not impaired.
- the electrically operated pumps 34, 42 can react quickly to changed situations without dead time, so that an optimal regulation, in particular of the temperature of the gas in the high-pressure supply line 18, is particularly simple.
- the low pressure exhaust pipe 26 downstream of the turbine 24 and before the connection point of the Low-pressure feedback line 32 with the low-pressure exhaust pipe 26 a particulate filter 44. Furthermore, after the connection point of the low-pressure return line 32 with the low-pressure exhaust gas line 26, an exhaust gas treatment device 46 is arranged, which is, for example, a catalyst.
- a throttle cap or a throttle valve is provided in the illustrated embodiment.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
Die Erfindung betrifft ein Abgasrückführungssystem für eine Brennkraftmaschine, insbesondere einen Dieselmotor.The invention relates to an exhaust gas recirculation system for an internal combustion engine, in particular a diesel engine.
Ein typisches Abgasrückführungssystem weist ein Rohrleitungssystem auf, das von einem Einlass über eine Brennkraftmaschine zu einem Auslass führt. Hierzu weist das Abgasrückführungssystem eine von einem Einlass zu einem Verdichter führende Niederdruck-Zuführleitung auf. Von dem Verdichter zu der Brennkraftmaschine führt eine Hochdruck-Zuführieitung, um die an dem Einlass eingesaugte Frischluft der Brennkraftmaschine, insbesondere einem Verbrennungsmotor, zuzuführen. Nach der Verbrennung in der Brennkraftmaschine wird das in der Brennkraftmaschine entstehende Abgas über eine Hochdruck-Abgasleitung von der Brennkraftmaschine zu einer Turbine abgeleitet. Von der Turbine gelangt das Abgas über eine Niederdruck-Abgasleitung zu einem Auslass. Um den Schadstoffausstoß des Abgases zu reduzieren und die Verbrennung in der Brennkraftmaschine zu verbessern, ist ein mit der Niederdruck-Abgasleitung und der Niederdruck-Zuführleitung verbundener Niederdruck-Rückführstrang vorgesehen, der ein Teil des Abgases der Niederdruck-Zuführleitung zuführt, wodurch ein Teil des Abgases rückgeführt wird.A typical exhaust gas recirculation system includes a piping system that leads from an inlet via an internal combustion engine to an exhaust. For this purpose, the exhaust gas recirculation system has a low-pressure supply line leading from an inlet to a compressor. From the compressor to the internal combustion engine performs a high-pressure Zuführieitung to supply the intake at the inlet fresh air of the internal combustion engine, in particular an internal combustion engine. After combustion in the internal combustion engine, the exhaust gas produced in the internal combustion engine is discharged via a high-pressure exhaust gas line from the internal combustion engine to a turbine. From the turbine, the exhaust gas passes through a low-pressure exhaust pipe to an outlet. In order to reduce the pollutant emission of the exhaust gas and to improve the combustion in the internal combustion engine, a low-pressure feedback line connected to the low-pressure exhaust line and the low-pressure supply line is provided which supplies a part of the exhaust gas to the low-pressure supply line, whereby a part of the exhaust gas is returned.
Nachteilig bei einem derartigen Abgasrückführungssystem ist, dass mit Hilfe von Drosselventilen, beispielsweise in der Niederdruck-Abgasleitung ein Staudruck erzeugt werden muss, damit eine unbeabsichtigte Kurzschluss-Strömung von dem Einlass über den Niederdruck-Rückführstrang zum Auslass unterbunden wird. Durch diese Drosselventile entsteht für die Turbine und ggf. für den Verdichter ein ohne Rückführstrang unnötiger Gegendruck, der den Wirkungsgrad der Turbine und des Verdichters beeinträchtigt. Dies führt zu einer Erhöhung der Ladungswechselarbeit, wodurch der motorische Wirkungsgrad beeinträchtigt wird.A disadvantage of such an exhaust gas recirculation system is that by means of throttle valves, for example in the low-pressure exhaust pipe a Back pressure must be generated so that an unintentional short-circuit flow is prevented from the inlet via the low-pressure feedback line to the outlet. Through these throttle valves, a backpressure unnecessary counterpressure for the turbine and possibly for the compressor, which affects the efficiency of the turbine and the compressor. This leads to an increase in the charge exchange work, whereby the motor efficiency is impaired.
Aufgabe der Erfindung ist es, ein Abgasrückführungssystem zu schaffen, bei dem eine Beeinträchtigung des motorischen Wirkungsgrades reduziert ist.The object of the invention is to provide an exhaust gas recirculation system in which an impairment of the engine efficiency is reduced.
Die Aufgabe wird durch die Merkmale des Anspruchs 1 erfindungsgemäß gelöst.The object is achieved by the features of claim 1 according to the invention.
Das erfindungsgemäße Abgasrückführungssystem für eine Brennkraftmaschine, bei der es sich insbesondere um einen Dieselmotor handelt, weist eine von einem Einlass zu einem Verdichter führende Niederdruck-Zuführleitung auf. Von dem Verdichter zu der Brennkraftmaschine führt eine Hochdruck-Zuführleitung. Von der Brennkraftmaschine zu einer Turbine führt eine Hochdruck-Abgasleitung, die von einer Niederdruck-Abgasleitung gefolgt wird, die von der Turbine zu einem Auslass führt. Mit der Niederdruck-Abgasleitung und der Niederdruck-Zuführleitung ist ein Niederdruck-Rückführstrang verbunden, der erfindungsgemäß eine Niederdruckpumpe aufweist. Unter einer Niederdruckpumpe wird eine Pumpe verstanden, die im Niederdruck-Rückführstrang angeordnet ist und nicht eine Pumpe, die nur niedrige Druckdifferenzen bereitstellen kann.The exhaust gas recirculation system according to the invention for an internal combustion engine, which is in particular a diesel engine, has a low-pressure supply line leading from an inlet to a compressor. From the compressor to the internal combustion engine performs a high pressure supply line. From the engine to a turbine, a high pressure exhaust conduit leads, followed by a low pressure exhaust conduit leading from the turbine to an exhaust. With the low-pressure exhaust pipe and the low-pressure supply line, a low-pressure feedback line is connected, which has a low-pressure pump according to the invention. A low-pressure pump is understood to mean a pump which is arranged in the low-pressure feedback line and not a pump which can only provide low pressure differences.
Bei der Niederdruckpumpe, bei der es sich insbesondere um eine Strömungspumpe, einen Verdichter oder ähnliches handelt, wird Abgas aus der Niederdruck--Abgasleitung in die Niederdruck-Zuführleitung gepumpt, so dass ein Teil des Abgases erneut der Verbrennung zugeführt wird. Durch die Niederdruckpumpe wird für nahezu beliebige Betriebspunkte die erforderliche Druckdifferenz bereitgestellt, um eine definierte Menge Abgas von der Niederdruck-Abgasleitung zur Niederdruck-Zuführleitung zu fördern, so dass eine Drosselklappe, ein Drosselventil oder dgl. in der Niederdruck-Abgasleitung nicht erforderlich ist. Dadurch kann der Druck in der Niederdruck-Abgasleitung im Wesentlichen dem Umgebungsdruck entsprechen, so dass am Ausgang der Turbine ein möglichst geringer Druck anliegt, wodurch der Wirkungsgrad der Turbine verbessert wird. Auf Grund des verbesserten Wirkungsgrades der Turbine wird der motorische Wirkungsgrad, d. h. der Wirkungsgrad des Verbrennungsmotors einschließlich der Turbine und des Verdichters, verbessert.In the case of the low-pressure pump, which is in particular a flow pump, a compressor or the like, exhaust gas is pumped from the low-pressure exhaust line into the low-pressure supply line, so that part of the exhaust gas is recirculated. By the Low pressure pump is provided for almost any operating points the required pressure difference to promote a defined amount of exhaust gas from the low-pressure exhaust pipe to the low-pressure supply, so that a throttle, a throttle valve or the like. In the low-pressure exhaust pipe is not required. Thereby, the pressure in the low-pressure exhaust pipe substantially correspond to the ambient pressure, so that at the output of the turbine as low as possible pressure is applied, whereby the efficiency of the turbine is improved. Due to the improved efficiency of the turbine, the engine efficiency, ie the efficiency of the internal combustion engine including the turbine and the compressor, is improved.
Insbesondere ist es möglich einen Kühler mit einer erhöhten Kühlleistung zur Kühlung des rückgeführten Abgases vorzusehen, da der durch diesen Kühler verursachte Druckverlust durch die Niederdruckpumpe ausgeglichen werden kann. Da das rückgeführte Abgas von der Niederdruckpumpe durch den Kühler gezogen wird, können die Kühlflächen des Kühlers nahezu beliebig groß gewählt werden. Ferner kann durch eine Variation der Saugleistung der Niederdruckpumpe die Temperatur des rückgeführten Abgases geregelt werden.In particular, it is possible to provide a cooler with an increased cooling capacity for cooling the recirculated exhaust gas, since the pressure loss caused by this cooler can be compensated by the low-pressure pump. Since the recirculated exhaust gas is drawn by the low-pressure pump through the radiator, the cooling surfaces of the radiator can be chosen almost arbitrarily large. Furthermore, by varying the suction power of the low-pressure pump, the temperature of the recirculated exhaust gas can be regulated.
Die Niederdruckpumpe ist insbesondere mengenregulierbar, so dass es möglich ist, das Volumen pro Zeiteinheit bzw. die Masse pro Zeiteinheit des rückzuführenden Abgases zu regeln und an die aktuellen Verhältnisse in der Brennkraftmaschine anzupassen.In particular, the low-pressure pump can be regulated in terms of quantity so that it is possible to regulate the volume per unit of time or the mass per unit of time of the exhaust gas to be recirculated and adapt it to the current conditions in the internal combustion engine.
Vorzugsweise ist in der Niederdruck-Abgasleitung ein Filterelement, insbesondere ein Partikelfilter, beispielsweise für Diesel-Partikel, vorgesehen. Das Filterelement ist in Strömungsrichtung gesehen insbesondere vor der Verbindung der Niederdruck-Abgasleitung mit dem Niederdruck-Rückführstrang angeordnet, so dass das rückgeführte Abgas gefiltert ist. Dadurch wird vermieden, dass für die Verbrennung ggf. nachteilige, feste Verbrennungsrückstände der Brennkraftmaschine zugeführt werden. Ferner wird eine Verschmutzung des Verdichters durch Verbrennungsrückstände vermieden.Preferably, a filter element, in particular a particle filter, for example for diesel particles, is provided in the low-pressure exhaust gas line. As seen in the flow direction, the filter element is arranged, in particular, before the connection of the low-pressure exhaust gas line to the low-pressure feedback line, so that the recirculated exhaust gas is filtered. This avoids that possibly inconvenient, solid Combustion residues of the internal combustion engine are supplied. Furthermore, contamination of the compressor is avoided by combustion residues.
Vorzugsweise ist in Strömungsrichtung des Abgases nach der Verbindung der Niederdruck-Abgasleitung mit dem Niederdruck-Rückführstrang eine Abgasbehandlungseinrichtung vorgesehen, durch die beispielsweise der Ausstoß von Stickoxiden NOx reduziert wird. Ggf. weist die Niederdruck-Abgasleitung ferner ein Rückschlagventil auf, um zu vermeiden, dass Frischluft von der Niederdruckpumpe über den Auslass in die Niederdruck-Zuführleitung gepumpt wird.Preferably, an exhaust gas treatment device is provided in the flow direction of the exhaust gas after the connection of the low-pressure exhaust pipe with the low-pressure feedback line, by the example, the emission of nitrogen oxides NO x is reduced. Possibly. The low pressure exhaust pipe further includes a check valve to prevent fresh air from the low pressure pump is pumped via the outlet in the low pressure supply line.
In bevorzugter Ausführung weist das Abgasrückführungssystem ferner ein mit der Hochdruck-Abgasleitung und der Hochdruck-Zuführteitung verbundenen Hochdruck-Rückführstrang auf, der vorzugsweise eine Hochdruckpumpe aufweist. Unter einer Hochdruckpumpe wird eine Pumpe verstanden, die in dem Hochdruck-Rückführstrang angeordnet ist, und nicht eine Pumpe, die nur hohe Druckdifferenzen bereitstellen kann. Durch die Hochdruckpumpe ist es möglich, insbesondere während der Kaltstartphase der Brennkraftmaschine heißes Abgas rückzuführen, um die Brennkraftmaschine möglichst schnell im optimalen Betriebspunkt betreiben zu können. Auf Grund der Hochdruckpumpe kann die Anordnung einer Drosselklappe oder eines Drosselventils in der Hochdruck-Zuführleitung vermieden werden, so dass der Wirkungsgrad des Verdichters verbessert ist. Ggf. ist in der Hochdruck-Zuführleitung und/ oder in der Niederdruck-Abgasleitung ein Abgasrückführungsventil zur Mengenregelung vorgesehen.In a preferred embodiment, the exhaust gas recirculation system further comprises a high-pressure return line connected to the high-pressure exhaust line and the high-pressure supply line, which preferably has a high-pressure pump. A high-pressure pump is understood to mean a pump which is arranged in the high-pressure return line and not a pump which can only provide high pressure differences. The high-pressure pump makes it possible to recirculate hot exhaust gas, in particular during the cold start phase of the internal combustion engine, in order to be able to operate the internal combustion engine as quickly as possible at the optimum operating point. Due to the high pressure pump, the arrangement of a throttle valve or a throttle valve in the high pressure supply line can be avoided, so that the efficiency of the compressor is improved. Possibly. is provided in the high pressure supply line and / or in the low pressure exhaust pipe, an exhaust gas recirculation valve for flow control.
Vorzugsweise weist die Niederdruck-Abgasleitung und/ oder die Hochdruck-Zuführleitung keine Drossel auf, so dass das Abgas bzw. die Frischluft ungedrosselt durch die Niederdruck-Abgasleitung bzw. die Hochdruck-Zuführleitung geführt wird. Die Niederdruck-Abgasleitung bzw. die Hochdruck-Zuführleitung sind somit ungedrosselt verbunden. Ggf. kann die ungedrosselt verbundene Hochdruck-Zuführleitung einen Ladeluftkühler aufweisen. Die Niederdruck-Abgasleitung kann ggf. das Rückschlagventil und/ oder die Abgasbehandlungseinrichtung aufweisen. Weitere einen zusätzlichen Druckverlust verursachende Geräte sind somit vorzugsweise nicht vorgesehen.Preferably, the low-pressure exhaust pipe and / or the high-pressure supply line has no throttle, so that the exhaust gas or the fresh air is fed unthrottled through the low-pressure exhaust pipe or the high pressure supply line. The low pressure exhaust pipe and the high pressure supply line are thus unthrottled connected. Possibly. can the unthrottled connected high-pressure supply line having a charge air cooler. The low-pressure exhaust pipe may optionally have the check valve and / or the exhaust gas treatment device. Further an additional pressure loss causing devices are thus preferably not provided.
Nachfolgend wird die Erfindung an Hand einer bevorzugten Ausführungsform unter Bezugnahme auf die anliegende Zeichnung näher erläutert.The invention will be explained in more detail with reference to a preferred embodiment with reference to the accompanying drawings.
Fig. 1 eine schematische Darstellung des erfindungsgemäßen Abgasrückführungssystems.Fig. 1 is a schematic representation of the exhaust gas recirculation system according to the invention.
Das erfindungsgemäße Abgasrückführungssystem weist einen Einlass 10 auf, der über eine Niederdruck-Zuführleitung 12 mit einem Verdichter 14 verbunden ist, so dass Frischluft von dem Einlass 10 in Richtung des Pfeils 16 gefördert wird. Von dem Verdichter 14 führt eine Hochdruck-Zuführleitung 18 zu einer Brennkraftmaschine 20, bei der es sich beispielsweise um einen Vierzylinder-Dieselmotor handelt. Von der Brennkraftmaschine 20 führt eine Hochdruck-Abgasleitung 22 zu einer Turbine 24. Die Turbine 24 und der Verdichter 14 sind im dargestellten Ausführungsbeispiel zur Ausbildung eines Turboladers miteinander verbunden. An die Turbine 24 schließt sich eine Niederdruck-Abgasleitung 26 an, die das Abgas der Brennkraftmaschine 20 in Richtung eines Pfeils 28 zu einem Auslass 30 fördert. Die Niederdruck-Abgasleitung 26 ist mit der Niederdruck-Zuführleitung 12 über einen Niederdruck-Rückführstrang 32 verbunden.The exhaust gas recirculation system according to the invention has an
Der Niederdruck-Rückführstrang weist eine Niederdruckpumpe 34 auf. Durch die Niederdruckpumpe 34 wird ein Teil des Abgases aus der Niederdruck-Abgasleitung 26 in die Niederdruck-Zuführleitung 12 gepumpt. Dadurch kann die Strömung in der Niederdruck-Abgasleitung 26 ungedrosselt erfolgen, d. h. eine Abgasklappe oder dgl. ist in der Niederdruck-Abgasleitung 26 nicht erforderlich. In einer alternativen nicht dargestellten Ausführungsform pumpt die Niederdruckpumpe 34 ggf. zusätzlich einen Teil des Abgases aus der Niederdruck-Abgasleitung 26 in die Hochdruck-Zuführleitung 18.The low-pressure feedback line has a low-
Vor und/ oder hinter der Niederdruckpumpe 34 kann ein Kühler 36 für das rückgeführte Abgas vorgesehen sein, der insbesondere nach der Kaltstartphase der Brennkraftmaschine 20 das heiße Abgas kühlt, um zu hohe Temperaturen der dem Verdichter 14 zugeführten Frischluft zu vermeiden. Ferner kann die Hochdruck-Zuführleitung 18 einen Ladeluftkühler 38 aufweisen, um die nach der im Verdichter 14 erfolgte Erwärmung der Frischluft ggf. ganz oder teilweise rückgängig zu machen. Mit Hilfe des Kühlers 36 und des Ladeluftkühlers 38 kann die Temperatur der Frischluft in der Hochdruck-Zuführleitung 18 bedarfsgerecht eingestellt werden.Before and / or behind the low-
Im dargestellten Ausführungsbeispiels weist das Abgasrückführungssystem ferner einen Hochdruck-Rückführstrang 40 auf, der über eine Hochdruckpumpe 42 Abgas von der Hochdruck-Abgasleitung 22 zu der Hochdruck-Zuführleitung 18 pumpt. Zusätzlich bzw. alternativ kann die Hochdruckpumpe 42 in der Hochdruck-Zuführleitung 18 insbesondere in Strömungsrichtung hinter dem Zuleitungspunkt des Hochdruck-Rückführstrangs 40 angeordnet sein.In the illustrated embodiment, the exhaust gas recirculation system further includes a high
Die Niederdruckpumpe 34 und die Hochdruckpumpe 42 können mechanisch betrieben werden. Vorzugsweise werden die Pumpen 34, 42 elektrisch betrieben, so dass der motorische Wirkungsgrad nicht beeinträchtigt wird. Ferner können die elektrisch betriebenen Pumpen 34, 42 ohne Totzeit schnell auf veränderte Situationen reagieren, so dass eine optimale Regelung insbesondere der Temperatur des Gases in der Hochdruck-Zuführleitung 18 besonders einfach möglich ist.The low-
Im dargestellten Ausführungsbeispiel weist die Niederdruck-Abgasleitung 26 in Strömungsrichtung hinter der Turbine 24 und vor dem Verbindungspunkt des Niederdruck-Rückführstrangs 32 mit der Niederdruck-Abgasleitung 26 einen Partikelfilter 44 auf. Ferner ist nach dem Verbindungspunkt des Niederdruck-Rückführstrangs 32 mit der Niederdruckabgasleitung 26 eine Abgasbehandlungseinrichtung 46 angeordnet, bei der es sich beispielsweise um einen Katalysator handelt.In the illustrated embodiment, the low
Bezeichnenderweise ist in dem dargestellten Ausführungsbeispiel weder in der Niederdruckabgasleitung 26 noch in der Hochdruck-Zuführleitung 18 eine Drosselkappe oder ein Drosselventil vorgesehen.Significantly, neither in the low-pressure
Claims (6)
einer von einem Einlass (10) zu einem Verdichter (14) führenden Niederdruck-Zuführleitung (12),
einer von dem Verdichter (14) zu der Brennkraftmaschine (20) führenden Hochdruck-Zuführleitung (18),
einer von der Brennkraftmaschine (20) zu einer Turbine (24) führenden Hochdruck-Abgasleitung (22),
einer von der Turbine (24) zu einem Auslass (30) führenden Niederdruck-Abgasleitung (26) und
einem mit der Niederdruck-Abgasleitung (26) und der Niederdruck-Zuführleitung (12) verbundenen Niederdruck-Rückführstrang (32),
wobei der Niederdruck-Rückführstrang (32) eine Niederdruckpumpe (34) aufweist,
dadurch gekennzeichnet,
dass die Niederdruckpumpe (34) derart mengenregulierbar ist, dass eine definierte Menge Abgas von der Niederdruck-Abgasleitung (26) zur Niederdruck-Zuführleitung (12) förderbar istExhaust gas recirculation system for an internal combustion engine (20), in particular a diesel engine, with
a low-pressure supply line (12) leading from a inlet (10) to a compressor (14),
one of the compressor (14) to the internal combustion engine (20) leading high-pressure supply line (18),
one of the internal combustion engine (20) to a turbine (24) leading high-pressure exhaust pipe (22),
one of the turbine (24) to an outlet (30) leading low-pressure exhaust pipe (26) and
a low pressure return line (32) connected to the low pressure exhaust line (26) and the low pressure supply line (12),
wherein the low pressure return line (32) comprises a low pressure pump (34),
characterized,
in that the low-pressure pump (34) can be regulated in such a quantity that a defined amount of exhaust gas can be conveyed from the low-pressure exhaust line (26) to the low-pressure supply line (12)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004061028.2A DE102004061028B4 (en) | 2004-12-18 | 2004-12-18 | Exhaust gas recirculation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1672208A2 true EP1672208A2 (en) | 2006-06-21 |
| EP1672208A3 EP1672208A3 (en) | 2011-06-22 |
Family
ID=35976767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05112094A Withdrawn EP1672208A3 (en) | 2004-12-18 | 2005-12-14 | Exhaust gas recirculation system |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1672208A3 (en) |
| DE (1) | DE102004061028B4 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1870590A1 (en) * | 2006-06-22 | 2007-12-26 | C.R.F. Società Consortile per Azioni | Internal combustion engine with a pump for exhaust gas recirculation |
| WO2008155336A1 (en) * | 2007-06-21 | 2008-12-24 | Valeo Systemes Thermiques | Architecture and method for recovering exhaust gases |
| FR2918709A1 (en) * | 2007-07-12 | 2009-01-16 | Renault Sas | INTERNAL COMBUSTION ENGINE HAVING MEANS FOR PROMOTING RECIRCULATION OF EXHAUST GASES. |
| DE102010032171A1 (en) | 2010-07-23 | 2012-01-26 | Mann + Hummel Gmbh | Exhaust gas recirculation system for internal combustion engine e.g. diesel engine, has pump formed as low pressure compressor of turbo supercharger, and low pressure turbine coupled with compressor and driving mass flow in air inlet |
| US20190277225A1 (en) * | 2017-12-20 | 2019-09-12 | Guangzhou Automobile Group Co., Ltd. | Exhaust gas recirculation system for gasoline engine and control method thereof |
| CN114753946A (en) * | 2022-04-01 | 2022-07-15 | 东风柳州汽车有限公司 | Exhaust gas recirculation system for supercharged gasoline engine and vehicle |
| CN116220933A (en) * | 2023-05-10 | 2023-06-06 | 潍柴动力股份有限公司 | EGR pump control method, device, vehicle and storage medium |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106065809B (en) | 2015-04-24 | 2020-12-25 | 福特环球技术公司 | Engine with two-stage supercharging and exhaust gas aftertreatment and method for operating the same |
| DE102015208684B4 (en) * | 2015-05-11 | 2019-04-18 | Ford Global Technologies, Llc | Motor vehicle with an exhaust gas recirculation train and two compressors |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9421145U1 (en) | 1994-04-28 | 1995-05-04 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 88045 Friedrichshafen | Diesel internal combustion engine with a heat exchanger for exhaust gas cooling arranged in an exhaust gas recirculation line |
| WO2004057168A1 (en) * | 2002-12-19 | 2004-07-08 | Avl List Gmbh | Method for operating a direct-injection diesel engine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT401816B (en) * | 1993-07-29 | 1996-12-27 | Vaillant Gmbh | FASTENING FOR COVERING ON A BOILER BLOCK |
| US6138649A (en) * | 1997-09-22 | 2000-10-31 | Southwest Research Institute | Fast acting exhaust gas recirculation system |
| US6192686B1 (en) * | 1999-03-22 | 2001-02-27 | Caterpillar Inc. | Exhaust gas recirculation system |
| JP3998861B2 (en) * | 1999-06-16 | 2007-10-31 | 株式会社小松製作所 | Exhaust gas recirculation device and control method thereof |
| JP2002089375A (en) * | 2000-09-11 | 2002-03-27 | Toyota Motor Corp | EGR device for internal combustion engine |
| FR2840648B1 (en) * | 2002-06-11 | 2006-08-04 | Inst Francais Du Petrole | DEVICE AND METHOD FOR CONTROLLING EXHAUST GAS RECIRCULATION FOR AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR OF THE DIESEL TYPE |
| AT7204U1 (en) * | 2002-12-19 | 2004-11-25 | Avl List Gmbh | METHOD FOR OPERATING A DIRECTLY INJECTING DIESEL INTERNAL COMBUSTION ENGINE |
-
2004
- 2004-12-18 DE DE102004061028.2A patent/DE102004061028B4/en not_active Expired - Fee Related
-
2005
- 2005-12-14 EP EP05112094A patent/EP1672208A3/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9421145U1 (en) | 1994-04-28 | 1995-05-04 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 88045 Friedrichshafen | Diesel internal combustion engine with a heat exchanger for exhaust gas cooling arranged in an exhaust gas recirculation line |
| WO2004057168A1 (en) * | 2002-12-19 | 2004-07-08 | Avl List Gmbh | Method for operating a direct-injection diesel engine |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1870590A1 (en) * | 2006-06-22 | 2007-12-26 | C.R.F. Società Consortile per Azioni | Internal combustion engine with a pump for exhaust gas recirculation |
| WO2008155336A1 (en) * | 2007-06-21 | 2008-12-24 | Valeo Systemes Thermiques | Architecture and method for recovering exhaust gases |
| FR2917789A1 (en) * | 2007-06-21 | 2008-12-26 | Valeo Systemes Thermiques | ARCHITECTURE AND METHOD FOR RECOVERING EXHAUST GAS |
| FR2918709A1 (en) * | 2007-07-12 | 2009-01-16 | Renault Sas | INTERNAL COMBUSTION ENGINE HAVING MEANS FOR PROMOTING RECIRCULATION OF EXHAUST GASES. |
| WO2009010680A1 (en) * | 2007-07-12 | 2009-01-22 | Renault S.A.S | Internal combustion engine comprising means to encourage exhaust gas recirculation |
| DE102010032171A1 (en) | 2010-07-23 | 2012-01-26 | Mann + Hummel Gmbh | Exhaust gas recirculation system for internal combustion engine e.g. diesel engine, has pump formed as low pressure compressor of turbo supercharger, and low pressure turbine coupled with compressor and driving mass flow in air inlet |
| DE102010032171B4 (en) | 2010-07-23 | 2018-11-29 | Mann+Hummel Gmbh | Exhaust gas recirculation system with pump for an internal combustion engine |
| US20190277225A1 (en) * | 2017-12-20 | 2019-09-12 | Guangzhou Automobile Group Co., Ltd. | Exhaust gas recirculation system for gasoline engine and control method thereof |
| CN114753946A (en) * | 2022-04-01 | 2022-07-15 | 东风柳州汽车有限公司 | Exhaust gas recirculation system for supercharged gasoline engine and vehicle |
| CN116220933A (en) * | 2023-05-10 | 2023-06-06 | 潍柴动力股份有限公司 | EGR pump control method, device, vehicle and storage medium |
| CN116220933B (en) * | 2023-05-10 | 2023-08-18 | 潍柴动力股份有限公司 | EGR pump control method and device, vehicle and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004061028A1 (en) | 2006-07-06 |
| DE102004061028B4 (en) | 2014-10-23 |
| EP1672208A3 (en) | 2011-06-22 |
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