DE102006058748A1 - Exhaust gas recirculation device for internal combustion engines - Google Patents
Exhaust gas recirculation device for internal combustion engines Download PDFInfo
- Publication number
- DE102006058748A1 DE102006058748A1 DE102006058748A DE102006058748A DE102006058748A1 DE 102006058748 A1 DE102006058748 A1 DE 102006058748A1 DE 102006058748 A DE102006058748 A DE 102006058748A DE 102006058748 A DE102006058748 A DE 102006058748A DE 102006058748 A1 DE102006058748 A1 DE 102006058748A1
- Authority
- DE
- Germany
- Prior art keywords
- exhaust gas
- exhaust
- gas recirculation
- recirculation device
- branch duct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
-
- 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
-
- 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
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
-
- 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
- F02M26/33—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 controlling the temperature of the recirculated gases
-
- 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
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Es wird eine Abgasrückführvorrichtung für Brennkraftmaschinen, insbesondere Dieselmotoren, angegeben, die einen von einem Abgasstrang (13) zu einem Luftansaugtrakt (11) der Brennkraftmaschine (10) führenden Abgas-Abzweigkanal (16), in dem ein von einem Kühlmittel durchströmter Abgaskühler (17) angeordnet ist, und Steuermittel zum Steuern der über den Abgas-Abzweigkanal (16) abgezweigten Abgasmenge aufweist. Für eine verbesserte Steuerung der Verbrennung in der Brennkraftmaschine (10), insbesondere zur Sicherstellung der sog. HCCI-Verbrennung, die im niedrigen Teillastbereich eine sehr stickoxid- und partikelarme Verbrennung ermöglicht, weisen die Steuermittel eine Ultraschallmesseinrichtung (25) auf, die den Massedurchfluss im Abgas-Abzweigkanal (16) direkt und hochgenau misst. Zur Beherrschung der Temperaturempfindlichkeit der Auswerteelektronik (29) in der Ultraschallmesseinrichtung (25) und zu deren Schutz gegen Überhitzung ist mindestens die Auswerteelektronik (29) der Ultraschallmesseinrichtung (25) von dem Kühlmittel umspült.The invention relates to an exhaust gas recirculation device for internal combustion engines, in particular diesel engines, which has an exhaust gas branch duct (16) leading from an exhaust line (13) to an air intake tract (11) of the internal combustion engine (10), in which an exhaust gas cooler (17) through which a coolant flows. is arranged, and control means for controlling the branched off via the exhaust branch passage (16) the amount of exhaust gas. For an improved control of the combustion in the internal combustion engine (10), in particular to ensure the so-called. HCCI combustion, which allows a very nitrogen oxide and low-particle combustion in the low part load range, the control means to an ultrasonic measuring device (25), the mass flow in the Exhaust branch duct (16) measures directly and with high precision. To control the temperature sensitivity of the transmitter (29) in the ultrasonic measuring device (25) and to protect against overheating at least the transmitter (29) of the ultrasonic measuring device (25) is surrounded by the coolant.
Description
Stand der TechnikState of the art
Die Erfindung geht aus von einer Abgasrückführvorrichtung für Brennkraftmaschinen, insbesondere für Dieselmotoren, nach dem Oberbegriff des Anspruchs 1.The The invention is based on an exhaust gas recirculation device for internal combustion engines, especially for Diesel engines, according to the preamble of claim 1.
Abgasrückführvorrichtungen
dienen zur Absenkung der Stickoxid-Emissionen im Abgas von Brennkraftmaschine.
Bei einer bekannten Abgasrückführvorrichtung
für Dieselmotoren
(
Es
ist bekannt, bei der Messung der Ansaugluft von Verbrennungsmotoren
Ultraschall-Durchflussmesser
einzusetzen (
Offenbarung der ErfindungDisclosure of the invention
Die erfindungsgemäße Abgasrückführvorrichtung mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass die rückgeführte Abgasrate nicht indirekt über die Messung der der Brennkraftmaschine zugeführten Frischluft bestimmt wird, sondern durch direkte Messung der Abgasrate selbst. Dadurch ist eine sehr genaue Kontrolle der Abgasrückführrate möglich, die unabdingbar ist um eine sog. homogene Verbrennung der Kohlenwasserstoffe und Stickoxide in einem sog. HCCI-Brennverfahren zu erreichen.The Exhaust gas recirculation device according to the invention with the features of claim 1 has the advantage that the recirculated exhaust gas rate not indirectly about the measurement of the fresh air supplied to the internal combustion engine is determined, but by direct measurement of the exhaust gas rate itself a very precise control of the exhaust gas recirculation rate possible, which is essential to a so-called homogeneous combustion of hydrocarbons and nitrogen oxides in a so-called HCCI combustion process.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Abgasrückführvorrichtung möglich.By in the further claims listed activities are advantageous developments and improvements in the claim 1 specified exhaust gas recirculation device possible.
Gemäß einer vorteilhaften Ausführungsform der Erfindung weist die Ultraschallmesseinrichtung mindestens zwei an der Kanalwand des Abgas-Abzweigkanals angeordnete Ultraschallwandler, mindestens einen dem Abgas ausgesetzten Temperatursensor und eine Auswerteelektronik auf. Die Ultraschallmesseinrichtung ist dabei so angeordnet, dass mindestens die Auswerteelektronik von dem den Abgaskühler nachfolgend beaufschlagenden Kühlmittel umspült ist. Hierzu ist die Ultraschallmesseinrichtung am Kühlmittelzulauf des Abgaskühlers angeordnet, liegt also in Strömungsrichtung des Kühlmittels gesehen stromaufwärts des Abgaskühlers, so dass eine effektive Kühlung zumindest der Auswerteelektronik erreicht wird. Dadurch ist es problemlos möglich, herkömmliche Ultraschallmesseinrichtungen unmittelbar dem heißen Abgas auszusetzen und so die Abgasrate direkt zu messen. Mit den Messsignalen der Ultraschallwandler und des Temperatursensors wird die Masse der Abgasrate, also die Masse der rückgeführten Abgasmenge, bestimmt.According to one advantageous embodiment of the Invention, the ultrasonic measuring device at least two the channel wall of the exhaust branch duct arranged ultrasonic transducer, at least one exhaust gas exposed to the temperature sensor and a Evaluation electronics on. The ultrasonic measuring device is included arranged so that at least the transmitter of the exhaust gas cooler subsequently applied coolant flows around. For this purpose, the ultrasonic measuring device is arranged on the coolant inlet of the exhaust gas cooler is located So in the flow direction of the coolant seen upstream the exhaust gas cooler, allowing for effective cooling at least the transmitter is reached. This makes it easy possible, conventional Ultrasonic measuring devices directly suspend the hot exhaust gas and so to measure the exhaust gas rate directly. With the measuring signals of the ultrasonic transducers and the temperature sensor, the mass of the exhaust gas rate, ie the Mass of recirculated exhaust gas quantity, certainly.
Gemäß einer vorteilhaften Ausführungsform der Erfindung ist dem Abgaskühler ein Bypasskanal zugeordnet, der einerseits am Abgaseingang und andererseits am Abgasausgang des Abgaskühlers mündet. An der am Abgaseingang liegenden, eingangsseitigen Mündung des Bypasskanals ist eine steuerbare Schwenkklappe angeordnet, die in der einen von zwei Schwenkendstellungen den Abgaseingang des Abgaskühlers und in der anderen die Mündung des Bypasskanals zu verschließen vermag.According to one advantageous embodiment of the Invention is the exhaust gas cooler assigned to a bypass channel, on the one hand at the exhaust gas inlet and on the other opens at the exhaust outlet of the exhaust gas cooler. At lying on the exhaust inlet, input side mouth of the Bypass channels is a controllable swing flap arranged in the one of two Schwenkendstellungen the exhaust gas inlet of the exhaust gas cooler and in the other the mouth to close the bypass channel can.
Gemäß einer bevorzugten Ausführungsform der Erfindung wird die Schwenkklappe mittels Stellsignale gesteuert, die aus dem Messsignal des Temperatursensors der Ultraschallmesseinrichtung abgeleitet sind. Da die Stellung der Schwenkklappe das Verhältnis von gekühltem zu ungekühltem Abgas in der Abgasrückführrate bestimmt, kann mittels der Schwenkklappe eine genaue Regelung der Abgastemperatur erreicht werden. Damit würde es z.B. möglich sein, zur Regeneration eines im Abgasstrom angeordneten Partikelfilters die Temperatur des rückgeführten Abgases langsam ansteigen zu lassen und damit die Abgastemperatur in Richtung Partikelfilter und Stickoxid-Speicherkatalysator langsam zu steigern, was die Forderung nach einer kontrollierten Temperaturregelung für die Regeneration von Partikelfilter und Stickoxid-Speicherkatalysator unterstützt.According to a preferred embodiment of the invention, the pivoting flap is controlled by means of actuating signals which are derived from the measuring signal of the temperature sensor of the ultrasonic measuring device. Since the position of the pivoting flap determines the ratio of cooled to uncooled exhaust gas in the exhaust gas recirculation rate, accurate control of the exhaust gas temperature can be achieved by means of the pivoting flap. This would eg be possible, to regenerate a arranged in the exhaust gas flow particle filter, the temperature of the recirculated exhaust gas slowly rise and thus slowly increase the exhaust gas temperature in the direction of particle filter and nitrogen oxide storage catalyst, which is the demand for a controlled temperature control for the regeneration of particulate filter and nitrogen oxide storage catalyst supported.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist aus den Messsignalen der Ultraschalleinrichtung ein für ein Leck im Abgaskühler signifikantes Leckerkennungssignal abgeleitet. Die Ultraschallmesseinrichtung ist aufgrund ihres Messprinzips in der Lage die Dichte des strömenden Abgases und die Feuchte des strömenden Abgases zu messen, da beide Messgrößen aus der gemessenen Strömungsgeschwindigkeit und der gemessenen Temperatur des Abgases im Abgas-Abzweigkanal abgeleitet sind. Entsteht ein Leck im Abgaskühler, so steigt die Feuchtigkeit des Abgases und dessen Dichte am Abgasausgang des Abgaskühlers stark an, was von der Ultraschallmesseinrichtung, z.B. durch signifikantes Ansteigen der Schallgeschwindigkeit, registriert wird.According to one preferred embodiment of Invention is from the measurement signals of the ultrasonic device for a Leak in the exhaust gas cooler derived significant leak detection signal. The ultrasonic measuring device is due to its measuring principle capable of the density of the flowing exhaust gas and the humidity of the flowing To measure exhaust gases, since both measured variables from the measured flow velocity and the measured temperature of the exhaust gas in the exhaust branch duct derived are. If a leak occurs in the exhaust gas cooler, the humidity increases of the exhaust gas and its density at the exhaust gas outlet of the exhaust gas cooler strongly, what is measured by the ultrasonic measuring device, e.g. by significant Increasing the speed of sound, is registered.
Gemäß einer weiteren Ausführungsform der Erfindung wird das Leckerkennungssignal in ein Stellsignal für die Schwenkklappe am Bypasskanal derart umgesetzt, dass die Schwenkklappe in ihre den Abgaseingang des Abgaskühlers sperrende Endstellung überführt wird. Gleichzeitig wird das Leckerkennungssignal in ein Anzeigesignal umgesetzt, das eine Warnanzeige einschaltet, die auf den defekten Abgaskühler hinweist. Eine solche Leckdetektion- und Leckwarneinrichtung für den Abgaskühler ist von erheblichen wirtschaftlichem Wert, da in den Brennraum der Brennkraftmaschine eindringendes Wasser zu erheblichen Schäden bis hin zum Stillstand der Brennkraftmaschine führt. Durch die rechtzeitige Leckwarnung und Abschaltung des defekten Abgaskühlers durch die umgesteuerte Schwenkklappe können kapitale Schäden im Motor vermieden werden.According to one another embodiment the invention, the leak detection signal in a control signal for the pivoting flap implemented on the bypass channel such that the pivoting flap in their the Exhaust gas inlet of the exhaust gas cooler locking end position is transferred. At the same time, the leak detection signal becomes an indication signal implemented, which turns on a warning indicator, which indicates the faulty exhaust gas cooler points. Such a leak detection and leak warning device for the exhaust gas cooler is of considerable economic value, as in the combustion chamber of the internal combustion engine penetrating water to considerable damage to a standstill the internal combustion engine leads. Due to the timely leak warning and shutdown of the defective exhaust gas cooler by the reversible flap can capital damages be avoided in the engine.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Die Erfindung ist anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Es zeigen:The The invention is based on an embodiment shown in the drawings explained in more detail in the following description. Show it:
Die
in
Dem
Abgaskühler
Stromabwärts der
ausgangsseitigen Mündung
In
Die
Ultraschallmesseinrichtung
Vom
Motorsteuergerät
Mittels
der beiden Ultraschallwandler
Tritt
infolge eines Lecks im Abgaskühler
Claims (12)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006058748A DE102006058748A1 (en) | 2006-12-12 | 2006-12-12 | Exhaust gas recirculation device for internal combustion engines |
FR0759717A FR2909726A1 (en) | 2006-12-12 | 2007-12-11 | Exhaust gas recycling device for diesel engine of commercial vehicle, has control unit controlling quantity of sampled exhaust gas and including ultrasonic measurement installation for measuring mass flow in sampling channel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006058748A DE102006058748A1 (en) | 2006-12-12 | 2006-12-12 | Exhaust gas recirculation device for internal combustion engines |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102006058748A1 true DE102006058748A1 (en) | 2008-06-19 |
Family
ID=39399544
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102006058748A Withdrawn DE102006058748A1 (en) | 2006-12-12 | 2006-12-12 | Exhaust gas recirculation device for internal combustion engines |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102006058748A1 (en) |
FR (1) | FR2909726A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013220679A1 (en) * | 2013-10-14 | 2015-04-16 | Continental Automotive Gmbh | Air intake system of an internal combustion engine and method for detecting a coolant leak |
US9291097B2 (en) | 2013-06-04 | 2016-03-22 | Caterpillar Inc. | Cooling module for electronic engine components |
DE102010030796B4 (en) | 2009-07-31 | 2024-05-08 | Ford Global Technologies, Llc | EGR cooler bypass strategy |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3103857A1 (en) * | 2019-11-28 | 2021-06-04 | Faurecia Systemes D'echappement | Exhaust gas routing device, in particular for a recirculation line |
FR3104213B1 (en) | 2019-12-05 | 2022-01-07 | Faurecia Systemes Dechappement | Device for cooling a flow measurement device for an exhaust gas recirculation line |
FR3111987A1 (en) * | 2020-06-26 | 2021-12-31 | Faurecia Systemes D'echappement | Measuring device for an exhaust gas recirculation system |
-
2006
- 2006-12-12 DE DE102006058748A patent/DE102006058748A1/en not_active Withdrawn
-
2007
- 2007-12-11 FR FR0759717A patent/FR2909726A1/en not_active Withdrawn
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010030796B4 (en) | 2009-07-31 | 2024-05-08 | Ford Global Technologies, Llc | EGR cooler bypass strategy |
US9291097B2 (en) | 2013-06-04 | 2016-03-22 | Caterpillar Inc. | Cooling module for electronic engine components |
DE102013220679A1 (en) * | 2013-10-14 | 2015-04-16 | Continental Automotive Gmbh | Air intake system of an internal combustion engine and method for detecting a coolant leak |
DE102013220679B4 (en) * | 2013-10-14 | 2018-02-22 | Continental Automotive Gmbh | Air intake system of an internal combustion engine and method for detecting a coolant leak |
US10094341B2 (en) | 2013-10-14 | 2018-10-09 | Continental Automotive Gmbh | Air intake system of an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
FR2909726A1 (en) | 2008-06-13 |
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Effective date: 20130829 |
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Free format text: PREVIOUS MAIN CLASS: F02M0025070000 Ipc: F02M0026470000 |
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