EP2159405A2 - Linear distance measurement for pressure and vacuum units of an AGR valve system - Google Patents
Linear distance measurement for pressure and vacuum units of an AGR valve system Download PDFInfo
- Publication number
- EP2159405A2 EP2159405A2 EP09011029A EP09011029A EP2159405A2 EP 2159405 A2 EP2159405 A2 EP 2159405A2 EP 09011029 A EP09011029 A EP 09011029A EP 09011029 A EP09011029 A EP 09011029A EP 2159405 A2 EP2159405 A2 EP 2159405A2
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- Prior art keywords
- exhaust gas
- gas recirculation
- magnet
- valve body
- internal combustion
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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
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/48—EGR valve position sensors
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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
- F02M26/52—Systems for actuating EGR valves
Definitions
- the invention relates to an exhaust gas recirculation system of an internal combustion engine with an exhaust gas recirculation valve having a housing with an inlet for the supply of exhaust gas of the internal combustion engine and at least one outlet for the return of a portion of the exhaust gas into the combustion air supply of the internal combustion engine, wherein a connection between the inlet and the at least one outlet of a valve body can be released or interrupted and an actuating system with actuator and valve body is provided, wherein the actuator moves the valve body to enable the connection between the inlet and the at least one outlet or interrupt, according to the features of the preamble of claim 1.
- Exhaust gas recirculation is used to reduce nitrogen oxides that are produced during combustion of fuel in internal combustion engines, such as gasoline or diesel engines. This reduction is necessary in order to comply in particular with the emission limit values prescribed today. In diesel engines, they also serve to reduce noise, whereas in gasoline engines due to the exhaust gas recirculation to reduce fuel consumption is possible. At high combustion temperatures arise in the engine increasingly polluting nitrogen oxides. In order to reduce this, the combustion temperature must be lowered, so that a part of the exhaust gas of the Internal combustion engine is therefore mixed in the partial load range via a connection to the intake of the internal combustion engine sucked fresh air.
- exhaust gas recirculation valve external exhaust gas recirculation
- exhaust gas recirculation installed outside the engine, which has an inlet to which the exhaust gas of the internal combustion engine is supplied and which has a valve body, as a function of which the exhaust gas is supplied to the intake tract of the internal combustion engine, so that the part of the exhaust gas in the partial load range of the intake fresh air can be mixed.
- exhaust gas recirculation exhaust gas recirculation valves are already known to which the exhaust gas is supplied from the combustion tract of the internal combustion engine, wherein by means of the exhaust gas recirculation valve, a portion of the exhaust gas via one or two outlets of the exhaust gas recirculation valve is supplied to the Ansaus Tha the internal combustion engine.
- These exhaust gas recirculation valves have an actuator, which is operated by a control unit in dependence on the parameters of the internal combustion engine. It can thus be regulated in which amount the exhaust gas recirculation valve supplied to the exhaust tract of the internal combustion engine can be supplied.
- Known exhaust gas recirculation valves have a housing having an inlet, wherein one or two outlets are further provided.
- the inlet for the exhaust gas and the outlet or the two outlets are arranged approximately at right angles to each other, wherein within the housing by a movable actuator piston rod is mounted on the spaced apart two discs are arranged in the interior of the cylindrical Housing are arranged movable.
- Older exhaust gas recirculation valves consist of bypass flap and exhaust gas recirculation valve. They thus include the sensors for detecting the position of the valve body within the exhaust gas recirculation valve as well as two actuators. This effort is reflected in the costs.
- valve flaps valve body
- actuators such as pressure cans or vacuum cans
- the valve flap is arranged on a piston, this of an actuator such.
- an electric or hydraulic actuator is moved.
- PLCD displacement sensors permanent magnetic linear contactless displacement
- the object is therefore to provide a measuring system for an exhaust gas recirculation system of an internal combustion engine which measures the direct position of the valve body or the position of the actuator in the exhaust gas recirculation system.
- the valve body in a generic exhaust gas recirculation system, is associated with a magnetic measuring system having a sensor element to detect the position of a magnet located in the positioning system linear contact.
- the magnetic measuring system is designed such that it is realized as Relativweg measurement.
- the choice of the magnetic measuring system has the advantage that it detects linearly the position of a magnet located in the adjustment system without contact. In this case, conventionally absolute measuring sensors and conventional magnets are out of consideration because of the large temperature differences in the total exhaust gas recirculation system.
- the magnetic measuring system which is used according to the invention is based on an angle-measuring sensor principle.
- the appropriate selection of the Magnets, the arrangement of the components, the geometry with large distances, the integration of the magnet in the adjustment system and the application area in the high-temperature region of the engine compartment of vehicles are of particular advantage here.
- the required high accuracy can thus be achieved even with extreme temperature differences between the sensor element and the exhaust gas recirculation system.
- the magnet is arranged on a piston of the pressure-reducing or vacuum-formed actuator of the exhaust gas recirculation system and the magnet is associated with a magnetic sensor element.
- the magnet is introduced in a direction of magnetization suitable for the movement of the piston.
- the adjustment paths of the system are in the order of magnitude, for example, from 1 mm (millimeters) to 50 mm (millimeters). If the magnet arranged on the piston is moved by the actuator, the angles of the magnetic field vectors change relative to the magnetic sensor element, for example a Hall element, so that the angle-measuring sensor principle can be realized on the basis of this arrangement.
- the change in the angle of the magnetic field vectors can be evaluated via a downstream control unit with suitable algorithms, so that, for example, for an engine control of an engine of a vehicle always the exact measure or the exact position of the position of the actuator and its elements in the exhaust gas recirculation system is known. It is also advantageous that compared to the known system cheaper magnets can be used and temperature fluctuations (temperature drifts) cause no deterioration of the signal quality. As magnets come, for example, conventional Permanent magnets into consideration, whereby plastic magnets which are magnetizable, come into consideration.
- the advantages of the measuring system according to the invention are that operating temperature ranges up to 160 degrees Celsius can be realized and that large temperature differences are possible within the system.
- the measurement accuracy is approximately 0.1 mm, with mechanical tolerances (manufacturing or assembly tolerances) are negligible.
- the measuring system according to the invention for the exhaust gas recirculation system is not only used there but generally in actuators and sensors with linear motion in a more difficult environment application, for example in special adjustment systems in the engine, exhaust, axle or powertrain of vehicles.
- the calibration for eliminating installation tolerances can for example take place in that the actuator moves with the piston and the magnet thereon in a first position, preferably first stop or end position, and detects this position and a corresponding signal is generated. Subsequently, the piston is moved to a second position, preferably the second stop or end position, and in turn generates a signal for this position.
- the two detected signals are detected in the downstream control unit and thus provide the absolute path or one depending on the algorithm
- Adjustment range that can be normalized. Due to this standardization, it is possible to take into account or eliminate the installation tolerances, as well as the later occurring possible aging of the magnet, so that this measuring system is very versatile.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Fluid-Driven Valves (AREA)
Abstract
Description
Die Erfindung betrifft ein Abgasrückführsystem einer Brennkraftmaschine mit einem Abgasrückführventil, das ein Gehäuse mit einem Einlass für die Zufuhr von Abgas der Brennkraftmaschine und mit zumindest einem Auslass für die Rückführung eines Teiles des Abgases in die Verbrennungsluftzufuhr der Brennkraftmaschine aufweist, wobei eine Verbindung zwischen dem Einlass und dem zumindest einen Auslass von einem Ventilkörper freigegeben oder unterbrochen werden kann und ein Stellsystem mit Stellantrieb und Ventilkörper vorgesehen ist, wobei der Stellantrieb den Ventilkörper bewegt, um die Verbindung zwischen dem Einlass und dem zumindest einen Auslass freizugeben oder zu unterbrechen, gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to an exhaust gas recirculation system of an internal combustion engine with an exhaust gas recirculation valve having a housing with an inlet for the supply of exhaust gas of the internal combustion engine and at least one outlet for the return of a portion of the exhaust gas into the combustion air supply of the internal combustion engine, wherein a connection between the inlet and the at least one outlet of a valve body can be released or interrupted and an actuating system with actuator and valve body is provided, wherein the actuator moves the valve body to enable the connection between the inlet and the at least one outlet or interrupt, according to the features of the preamble of claim 1.
Die Abgasrückführung (AGR) wird zur Minderung von Stickoxyden verwendet, welche bei der Verbrennung von Kraftstoff in Brennkraftmaschinen, wie Otto- oder Dieselmotoren, entstehen. Diese Reduktion ist erforderlich, um insbesondere die heute vorgeschriebenen Emissionsgrenzwerte einzuhalten. In Dieselmotoren dienen sie zusätzlich der Geräuschreduzierung, wohingegen in Ottomotoren auf Grund der Abgasrückführung die Senkung des Kraftstoffverbrauches möglich ist. Bei hohen Verbrennungstemperaturen entstehen in der Brennkraftmaschine zunehmend umweltschädliche Stickoxyde. Zwecks Reduzierung dieser muss die Verbrennungstemperatur gesenkt werden, so dass ein Teil des Abgases der Brennkraftmaschine deshalb im Teillastbereich über eine Verbindung zum Ansaugtrakt der Brennkraftmaschine der angesaugten Frischluft zugemischt wird. Die Regelung hierzu übernimmt ein außerhalb des Motors angebrachtes Abgasrückführventil (externe Abgasrückführung), welches einen Einlass aufweist, dem das Abgas der Brennkraftmaschine zugeführt wird und das einen Ventilkörper aufweist, in Abhängigkeit dessen Stellung das Abgas dem Ansaugtrakt der Brennkraftmaschine zugeführt wird, so dass der Teil des Abgases im Teillastbereich der angesaugten Frischluft zugemischt werden kann.Exhaust gas recirculation (EGR) is used to reduce nitrogen oxides that are produced during combustion of fuel in internal combustion engines, such as gasoline or diesel engines. This reduction is necessary in order to comply in particular with the emission limit values prescribed today. In diesel engines, they also serve to reduce noise, whereas in gasoline engines due to the exhaust gas recirculation to reduce fuel consumption is possible. At high combustion temperatures arise in the engine increasingly polluting nitrogen oxides. In order to reduce this, the combustion temperature must be lowered, so that a part of the exhaust gas of the Internal combustion engine is therefore mixed in the partial load range via a connection to the intake of the internal combustion engine sucked fresh air. The regulation takes place for this purpose an exhaust gas recirculation valve (external exhaust gas recirculation) installed outside the engine, which has an inlet to which the exhaust gas of the internal combustion engine is supplied and which has a valve body, as a function of which the exhaust gas is supplied to the intake tract of the internal combustion engine, so that the part of the exhaust gas in the partial load range of the intake fresh air can be mixed.
Zur Realisierung dieser Abgasrückführung sind schon Abgasrückführventile bekannt geworden, denen aus dem Verbrennungstrakt der Brennkraftmaschine das Abgas zugeführt wird, wobei mittels des Abgasrückführventils ein Teil des Abgases über ein oder zwei Auslässe des Abgasrückführventils dem Ansaustrakt der Brennkraftmaschine zugeführt wird. Diese Abgasrückführventile haben einen Stellantrieb, der von einem Steuergerät in Abhängigkeit von den Parametern der Brennkraftmaschine betrieben wird. Damit kann geregelt werden, in welcher Menge das dem Abgasrückführventil zugeführte Abgas dem Ansaugtrakt der Brennkraftmaschine zugeführt werden kann.To realize this exhaust gas recirculation exhaust gas recirculation valves are already known to which the exhaust gas is supplied from the combustion tract of the internal combustion engine, wherein by means of the exhaust gas recirculation valve, a portion of the exhaust gas via one or two outlets of the exhaust gas recirculation valve is supplied to the Ansaustrakt the internal combustion engine. These exhaust gas recirculation valves have an actuator, which is operated by a control unit in dependence on the parameters of the internal combustion engine. It can thus be regulated in which amount the exhaust gas recirculation valve supplied to the exhaust tract of the internal combustion engine can be supplied.
Bekannte Abgasrückführventile weisen ein Gehäuse auf, das einen Einlass aufweist, wobei weiterhin ein oder zwei Auslässe vorgesehen sind. Dabei sind der Einlass für das Abgas und der eine Auslass oder die beiden Auslässe etwa im rechten Winkel zueinander angeordnet, wobei innerhalb des Gehäuses eine von einem Stellantrieb bewegbare Kolbenstange gelagert ist, auf der beabstandet zueinander zwei Scheiben angeordnet sind, die in dem Inneren des zylinderförmigen Gehäuses bewegbar angeordnet sind. Durch die axiale Verschiebung dieser beiden Ventilkörper wird die Verbindung zwischen dem Einlass und dem Auslass (oder den beiden Auslässen) entweder vollständig unterbrochen (keine Abgasrückführung) oder teilweise oder vollständig freigegeben (teilweise oder vollständige Rückführung des dem Abgasrückführventil zugeführten Abgases). Ein solcher Aufbau hat jedoch den Nachteil, dass sehr enge Toleranzen eingehalten werden müssen, damit die beiden axial in dem Gehäuse des Abgasrückführventils bewegbaren Dichtscheiben innerhalb des Gehäuses radial umlaufend an dessen Innenfläche dichtend zur Anlage kommen, wenn die Verbindung zwischen Ein- und dem Auslass vollständig abgedichtet und dementsprechend unterbrochen werden soll.Known exhaust gas recirculation valves have a housing having an inlet, wherein one or two outlets are further provided. In this case, the inlet for the exhaust gas and the outlet or the two outlets are arranged approximately at right angles to each other, wherein within the housing by a movable actuator piston rod is mounted on the spaced apart two discs are arranged in the interior of the cylindrical Housing are arranged movable. By the axial displacement of these two Valve body is the connection between the inlet and the outlet (or the two outlets) either completely interrupted (no exhaust gas recirculation) or partially or completely released (partial or complete return of the exhaust gas recirculation valve supplied exhaust gas). However, such a structure has the disadvantage that very tight tolerances must be met, so that the two axially movable in the housing of the exhaust gas recirculation valve sealing discs within the housing radially circumferentially on the inner surface sealingly come to rest when the connection between the inlet and the outlet completely sealed and should be interrupted accordingly.
Ältere Abgasrückführventile bestehen aus Bypassklappe und Abgasrückführventil. Sie beinhalten somit die Sensorik zur Erfassung der Position des Ventilkörpers innerhalb des Abgasrückführventils wie auch zwei Aktuatoren. Dieser Aufwand spiegelt sich in den Kosten wider.Older exhaust gas recirculation valves consist of bypass flap and exhaust gas recirculation valve. They thus include the sensors for detecting the position of the valve body within the exhaust gas recirculation valve as well as two actuators. This effort is reflected in the costs.
Heutzutage sind im Strang der Abgasrückführung und auch im Turboladerbereich die Steuerung von Ventilklappen (Ventilkörper) mittels Stellantrieben wie Druckdosen bzw. Unterdruckdosen gängige Praxis. Zu diesem Zweck ist die Ventilklappe auf einem Kolben angeordnet, wobei dieser von einem Stellantrieb, wie z. B. einem elektrischen oder hydraulischen Stellantrieb, bewegt wird. Um ein genaues Regelverhalten zu realisieren, werden bislang sehr hochpreisige Messsysteme eingesetzt. Dabei handelt es sich beispielsweise um sogenannte PLCD-Weg-Sensoren (Permanentmagnetic Linear Contactless Displacement). Um insbesondere einen größeren Markt für Fahrzeuge eine kostengünstige Regelung und Erfassung der Position der Ventilklappe zur Verfügung stellen zu können, sind die bisher bekannten Systeme, insbesondere die PLCD-Systeme nicht geeignet. Diese Systeme stehen nicht in dem erforderlichen Arbeitstemperaturbereich, wobei im Abgasrückführstrang Temperaturen größer als 100 Grad herrschen, zur Verfügung. Außerdem sind diese bekannten Systeme komplex aufgebaut, so dass sie für die Einbausituation im Abgasrückführsystem nicht geeignet sind. Außerdem stoßen herkömmliche kostengünstige Absolutweg-Messsysteme aufgrund der Temperaturschwankungen im Abgasrückführstrang an ihre Grenzen.Nowadays in the string of exhaust gas recirculation and also in the turbocharger sector, the control of valve flaps (valve body) by means of actuators such as pressure cans or vacuum cans are common practice. For this purpose, the valve flap is arranged on a piston, this of an actuator such. B. an electric or hydraulic actuator is moved. In order to realize a precise control behavior, so far very high-priced measuring systems are used. These are, for example, so-called PLCD displacement sensors (permanent magnetic linear contactless displacement). In order to be able to provide cost-effective regulation and detection of the position of the valve flap in particular for a larger market for vehicles, the hitherto known systems, in particular the PLCD systems, are not suitable. These Systems are not available in the required working temperature range, with temperatures greater than 100 degrees prevailing in the exhaust gas recirculation loop. In addition, these known systems are complex, so that they are not suitable for the installation situation in the exhaust gas recirculation system. In addition, conventional cost-effective Absolutweg measurement systems come up against their limits due to the temperature fluctuations in the exhaust gas recirculation train.
Aufgabe ist es daher, für ein Abgasrückführsystem einer Brennkraftmaschine ein Messsystem zur Verfügung zu stellen, welches die direkte Position des Ventilkörpers bzw. der Stellung des Stellantriebes in dem Abgasrückführsystem misst.The object is therefore to provide a measuring system for an exhaust gas recirculation system of an internal combustion engine which measures the direct position of the valve body or the position of the actuator in the exhaust gas recirculation system.
Diese Aufgabe ist durch die Merkmale des Patentanspruches 1 gelöst.This object is solved by the features of claim 1.
Erfindungsgemäß ist vorgesehen, dass bei einem gattungsgemäßen Abgasrückführsystem dem Ventilkörper ein magnetisches Messsystem zugeordnet ist, welches ein Sensorelement aufweist, um berührungslos die Postion eines im Stellsystem befindlichen Magneten linear zu erfassen. Damit ist es in vorteilhafter Weise möglich, die direkte Position des Ventilkörpers bzw. des Stellantriebes in dem Abgasrückführsystem zu erfassen. Dabei ist das magnetische Messsystem derart ausgeführt, dass es als Relativweg-Messung realisiert ist. Die Wahl des magnetischen Messsystems hat den Vorteil, dass es berührungslos die Position eines im Verstellsystem befindlichen Magneten linear erfasst. In diesem Fall fallen herkömmlich absolut messende Sensoren und übliche Magnete wegen der großen Temperaturunterschiede im Gesamtabgasrückführsystem aus der Betrachtung. Daher beruht das magnetische Messsystem, welches erfindungsgemäß eingesetzt wird, auf einem winkelmessenden Sensorprinzip. Die entsprechende Auswahl des Magneten, die Anordnung der Komponenten, die Geometrie mit großen Abständen, die Integration des Magneten im Verstellsystem und der Einsatzbereich im Hochtemperaturbereich des Motorraumes von Fahrzeugen sind hierbei von besonderem Vorteil. Durch entsprechende Auswahl bzw. Beeinflussung der vorstehend genannten Elemente kann somit die geforderte hohe Genauigkeit auch bei extremen Temperaturunterschieden zwischen Sensorelement und Abgasrückführsystem erreicht werden.According to the invention it is provided that in a generic exhaust gas recirculation system, the valve body is associated with a magnetic measuring system having a sensor element to detect the position of a magnet located in the positioning system linear contact. Thus, it is advantageously possible to detect the direct position of the valve body and the actuator in the exhaust gas recirculation system. In this case, the magnetic measuring system is designed such that it is realized as Relativweg measurement. The choice of the magnetic measuring system has the advantage that it detects linearly the position of a magnet located in the adjustment system without contact. In this case, conventionally absolute measuring sensors and conventional magnets are out of consideration because of the large temperature differences in the total exhaust gas recirculation system. Therefore, the magnetic measuring system which is used according to the invention is based on an angle-measuring sensor principle. The appropriate selection of the Magnets, the arrangement of the components, the geometry with large distances, the integration of the magnet in the adjustment system and the application area in the high-temperature region of the engine compartment of vehicles are of particular advantage here. By appropriate selection or influencing of the aforementioned elements, the required high accuracy can thus be achieved even with extreme temperature differences between the sensor element and the exhaust gas recirculation system.
In Weiterbildung der Erfindung ist der Magnet an einem Kolben des als Druck- bzw. Unterdruckdose ausgebildeten Stellantriebes des Abgasrückführsystems angeordnet ist und dem Magneten ein magnetisches Sensorelement zugeordnet ist. Dabei ist der Magnet in einer für die Bewegung des Kolbens geeigneten Magnetisierrichtung eingebracht. Die Verstellwege des Systems liegen in den Größenordnungen beispielsweise von 1 mm (Millimeter) bis zu 50 mm (Millimeter). Wird der auf dem Kolben angeordnete Magnet von dem Stellantrieb bewegt, verändern sich relativ zu dem magnetischen Sensorelement, beispielsweise einem Hall-Element, die Winkel der Magnetfeldvektoren, so dass sich aufgrund dieser Anordnung das winkelmessende Sensorprinzip realisieren lässt. Die Änderung der Winkel der Magnetfeldvektoren lässt sich über ein nachgeschaltetes Steuergerät mit geeigneten Algorithmen auswerten, so dass beispielsweise für eine Motorsteuerung eines Motors eines Fahrzeuges immer das genaue Maß bzw. die genaue Position der Stellung des Stellantriebes und seiner Elemente im Abgasrückführsystem bekannt ist. Außerdem ist von Vorteil, dass gegenüber dem bekannten System kostengünstigere Magnete eingesetzt werden können und Temperaturschwankungen (Temperaturdrifts) keine Verschlechterung der Signalqualität hervorrufen. Als Magnete kommen beispielsweise herkömmliche Permanentmagnete in Betracht, wobei auch Kunststoffmagnete, die magnetisierbar sind, in Betracht kommen.In a further development of the invention, the magnet is arranged on a piston of the pressure-reducing or vacuum-formed actuator of the exhaust gas recirculation system and the magnet is associated with a magnetic sensor element. In this case, the magnet is introduced in a direction of magnetization suitable for the movement of the piston. The adjustment paths of the system are in the order of magnitude, for example, from 1 mm (millimeters) to 50 mm (millimeters). If the magnet arranged on the piston is moved by the actuator, the angles of the magnetic field vectors change relative to the magnetic sensor element, for example a Hall element, so that the angle-measuring sensor principle can be realized on the basis of this arrangement. The change in the angle of the magnetic field vectors can be evaluated via a downstream control unit with suitable algorithms, so that, for example, for an engine control of an engine of a vehicle always the exact measure or the exact position of the position of the actuator and its elements in the exhaust gas recirculation system is known. It is also advantageous that compared to the known system cheaper magnets can be used and temperature fluctuations (temperature drifts) cause no deterioration of the signal quality. As magnets come, for example, conventional Permanent magnets into consideration, whereby plastic magnets which are magnetizable, come into consideration.
Die Vorteile des erfindungsgemäßen Messsystems liegen darin, dass sich Arbeitstemperaturbereiche bis hin zu 160 Grad Celsius realisieren lassen und dass große Temperaturunterschiede systemintern möglich sind. Außerdem liegt die Messgenauigkeit ca. bei 0,1 mm, wobei mechanische Toleranzen (Fertigungs- bzw. Montagetoleranzen) vernachlässigbar sind. Außerdem ist von Vorteil, dass das System kalibrierbar ist und eine hohe Langzeitstabilität (wichtig für den Einsatz in Fahrzeugen) gegeben ist, da eine mögliche Alterung des Magnetes das Ergebnis nicht beeinflusst.The advantages of the measuring system according to the invention are that operating temperature ranges up to 160 degrees Celsius can be realized and that large temperature differences are possible within the system. In addition, the measurement accuracy is approximately 0.1 mm, with mechanical tolerances (manufacturing or assembly tolerances) are negligible. In addition, it is advantageous that the system can be calibrated and high long-term stability (important for use in vehicles) is given, since a possible aging of the magnet does not affect the result.
Es ist denkbar, dass das erfindungsgemäße Messsystem für das Abgasrückführsystem nicht nur dort eingesetzt wird, sondern allgemein in Aktuatoren und Sensoren mit Linearbewegung in schwierigerem Umfeld Anwendung findet, beispielsweise in speziellen Verstellsystemen im Motorbereich, Abgasbereich, Achsbereich oder Antriebsstrang von Fahrzeugen.It is conceivable that the measuring system according to the invention for the exhaust gas recirculation system is not only used there but generally in actuators and sensors with linear motion in a more difficult environment application, for example in special adjustment systems in the engine, exhaust, axle or powertrain of vehicles.
Die Kalibrierung zur Eliminierung von Verbautoleranzen kann beispielsweise dadurch erfolgen, dass der Stellantrieb mit dem Kolben und dem darauf befindlichen Magneten in eine erste Position, vorzugsweise erste Anschlag- oder Endstellung, verfährt und diese Position erfasst und ein entsprechendes Signal erzeugt wird. Anschließend wird der Kolben in eine zweite Position, vorzugsweise die zweite Anschlag- oder Endstellung, verfahren und wiederum ein Signal für diese Position erzeugt. Die beiden erfassten Signale werden in dem nachgeschalteten Steuergerät erfasst und stellen somit je nach Algorithmus den absoluten Weg oder einenThe calibration for eliminating installation tolerances can for example take place in that the actuator moves with the piston and the magnet thereon in a first position, preferably first stop or end position, and detects this position and a corresponding signal is generated. Subsequently, the piston is moved to a second position, preferably the second stop or end position, and in turn generates a signal for this position. The two detected signals are detected in the downstream control unit and thus provide the absolute path or one depending on the algorithm
Verstellbereich dar, der normiert werden kann. Aufgrund dieser Normierung ist es möglich, die Verbautoleranzen, ebenso wie die später auftretende mögliche Alterung des Magnetes, zu berücksichtigen bzw. zu eliminieren, so dass dieses Messsystem sehr vielseitig einsetzbar ist.Adjustment range that can be normalized. Due to this standardization, it is possible to take into account or eliminate the installation tolerances, as well as the later occurring possible aging of the magnet, so that this measuring system is very versatile.
Claims (6)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008044705 | 2008-08-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2159405A2 true EP2159405A2 (en) | 2010-03-03 |
| EP2159405A3 EP2159405A3 (en) | 2012-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09011029A Withdrawn EP2159405A3 (en) | 2008-08-28 | 2009-08-28 | Linear distance measurement for pressure and vacuum units of an AGR valve system |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2159405A3 (en) |
| DE (1) | DE102009039019A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2405124A1 (en) | 2010-07-02 | 2012-01-11 | Hirschmann Automotive GmbH | Exhaust gas recirculation system of a combustion engine with an exhaust gas recirculation valve |
| DE102013007738A1 (en) | 2013-05-07 | 2014-11-13 | Mann + Hummel Gmbh | Adjusting device of an internal combustion engine and actuator of an adjusting device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3623677C1 (en) * | 1986-07-12 | 1987-04-16 | Daimler Benz Ag | Exhaust gas recirculation device for an internal combustion engine |
| EP1394399A1 (en) * | 2002-08-30 | 2004-03-03 | Cooper-Standard Automotive (Deutschland) GmbH | Vehicle solenoid valve, particularly exhaust gas recirculation valve, and method of manufacturing a vehicle solenoid valve |
| US20050046415A1 (en) * | 2003-09-03 | 2005-03-03 | Mitsubishi Denki Kabushiki Kaisha | Position detecting device |
| DE102006048084A1 (en) * | 2006-10-11 | 2008-04-17 | Gustav Wahler Gmbh U. Co. Kg | Linear sensor for e.g. exhaust gas recycling valve, has magnet arrangement with magnets arranged at distance from one another and parallel to one another, where hall sensor is arranged in center in gap between magnets |
-
2009
- 2009-08-28 EP EP09011029A patent/EP2159405A3/en not_active Withdrawn
- 2009-08-28 DE DE102009039019A patent/DE102009039019A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3623677C1 (en) * | 1986-07-12 | 1987-04-16 | Daimler Benz Ag | Exhaust gas recirculation device for an internal combustion engine |
| EP1394399A1 (en) * | 2002-08-30 | 2004-03-03 | Cooper-Standard Automotive (Deutschland) GmbH | Vehicle solenoid valve, particularly exhaust gas recirculation valve, and method of manufacturing a vehicle solenoid valve |
| US20050046415A1 (en) * | 2003-09-03 | 2005-03-03 | Mitsubishi Denki Kabushiki Kaisha | Position detecting device |
| DE102006048084A1 (en) * | 2006-10-11 | 2008-04-17 | Gustav Wahler Gmbh U. Co. Kg | Linear sensor for e.g. exhaust gas recycling valve, has magnet arrangement with magnets arranged at distance from one another and parallel to one another, where hall sensor is arranged in center in gap between magnets |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2405124A1 (en) | 2010-07-02 | 2012-01-11 | Hirschmann Automotive GmbH | Exhaust gas recirculation system of a combustion engine with an exhaust gas recirculation valve |
| DE102011107819A1 (en) | 2010-07-02 | 2012-01-26 | Hirschmann Automotive Gmbh | Exhaust gas recirculation system of an internal combustion engine with an exhaust gas recirculation valve |
| DE102013007738A1 (en) | 2013-05-07 | 2014-11-13 | Mann + Hummel Gmbh | Adjusting device of an internal combustion engine and actuator of an adjusting device |
| DE102013007738B4 (en) * | 2013-05-07 | 2018-11-15 | Mann+Hummel Gmbh | Adjusting device of an internal combustion engine and actuator of an adjusting device |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2159405A3 (en) | 2012-11-07 |
| DE102009039019A1 (en) | 2010-07-01 |
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