DE102011086774A1 - Device for simultaneous determination of level and quality of urea water solution for diesel engine, has ultrasonic transducers arranged in tank such that ultrasonic signals emitted by ultrasonic transducers overlap each other - Google Patents
Device for simultaneous determination of level and quality of urea water solution for diesel engine, has ultrasonic transducers arranged in tank such that ultrasonic signals emitted by ultrasonic transducers overlap each other Download PDFInfo
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- DE102011086774A1 DE102011086774A1 DE102011086774A DE102011086774A DE102011086774A1 DE 102011086774 A1 DE102011086774 A1 DE 102011086774A1 DE 102011086774 A DE102011086774 A DE 102011086774A DE 102011086774 A DE102011086774 A DE 102011086774A DE 102011086774 A1 DE102011086774 A1 DE 102011086774A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
- F01N2610/142—Controlling the filling of the tank
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/148—Arrangement of sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1814—Tank level
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1818—Concentration of the reducing agent
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02809—Concentration of a compound, e.g. measured by a surface mass change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02818—Density, viscosity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02836—Flow rate, liquid level
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Thermal Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid Mechanics (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Toxicology (AREA)
- Electromagnetism (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Vorrichtung und ein Verfahren zur gleichzeitigen Füllstandsbestimmung und Qualitätsbestimmung einer Reduktionsmittellösung. Weiterhin betrifft die vorliegende Erfindung ein Computerprogramm, das alle Schritte des erfindungsgemäßen Verfahrens ausführt, wenn es auf einem Rechengerät abläuft. Schließlich betrifft die vorliegende Erfindung ein Computerprogrammprodukt mit Programmcode, der auf einem maschinenlesbaren Träger gespeichert ist, zur Durchführung des erfindungsgemäßen Verfahrens, wenn das Programm auf einem Rechengerät ausgeführt wird. The present invention relates to a device and a method for simultaneous level determination and quality determination of a reducing agent solution. Furthermore, the present invention relates to a computer program that performs all the steps of the inventive method when it runs on a computing device. Finally, the present invention relates to a computer program product with program code, which is stored on a machine-readable carrier, for carrying out the method according to the invention when the program is executed on a computing device.
Stand der TechnikState of the art
Um die immer strengeren Abgasgesetzgebungen zu erfüllen, ist es notwendig, Stickoxide (NOx) im Abgas von Verbrennungskraftmaschinen, insbesondere von Dieselmotoren, zu verringern. Hierzu ist es bekannt, im Abgasbereich von Brennkraftmaschinen einen SCR-Katalysator (Selective Catalytic Reduction) anzuordnen, der dem Abgas der Verbrennungskraftmaschine enthaltene Stickoxide in Gegenwart eines Reduktionsmittels zu Stickstoff reduziert. Hierdurch kann der Anteil von Stickoxid im Abgas erheblich verringert werden. Für den Ablauf dieser Reaktion wird Ammoniak (NH3) benötigt, das dem Abgas zugemischt wird. Als Reduktionsmittel werden daher NH3 bzw. NH3-abspaltende Reagenzien eingesetzt. In der Regel wird hierfür eine wässrige Harnstofflösung (Harnstoffwasserlösung) verwendet, die vor dem SCR-Katalysator im Abgasstrang eingespritzt wird. Aus dieser Lösung bildet sich Ammoniak, das als Reduktionsmittel wirkt. Eine 32,5 %ige wässrige Harnstofflösung ist unter dem Markennamen AdBlue® kommerziell erhältlich. In order to meet the increasingly stringent exhaust gas legislation, it is necessary to reduce nitrogen oxides (NOx) in the exhaust gas of internal combustion engines, especially diesel engines. For this purpose, it is known to arrange an SCR catalytic converter (Selective Catalytic Reduction) in the exhaust region of internal combustion engines, which reduces nitrogen oxides contained in the exhaust gas of the internal combustion engine in the presence of a reducing agent. As a result, the proportion of nitrogen oxide in the exhaust gas can be significantly reduced. For the course of this reaction ammonia (NH 3 ) is required, which is admixed to the exhaust gas. As reducing agents therefore NH 3 or NH 3 -splitting reagents are used. As a rule, an aqueous urea solution (urea-water solution) is used for this, which is injected in the exhaust gas line upstream of the SCR catalytic converter. From this solution forms ammonia, which acts as a reducing agent. A 32.5% aqueous urea solution is commercially available under the trade name AdBlue ®.
Um für den Betrieb der Verbrennungskraftmaschine ausreichend Reduktionsmittel bereitstellen zu können, ist ein Tank zur Bevorratung der Harnstoffwasserlösung vorgesehen. Der Füllstand in diesem Tank muss überwacht werden. Außerdem sieht die Gesetzgebung vor, dass die Qualität der Harnstoffwasserlösung im Tank in gewisser Güte bestimmt werden soll. So muss zumindest die Nachbetankung von Wasser anstelle von Harnstoffwasserlösung erkannt werden. In order to provide sufficient reducing agent for the operation of the internal combustion engine, a tank for storing the urea water solution is provided. The level in this tank must be monitored. In addition, the legislation provides that the quality of the urea water solution in the tank should be determined to a certain extent. So at least the refueling of water must be recognized instead of urea water solution.
Die Nachbetankung von Wasser wird derzeit über NOx-Sensoren im Abgasbereich der Verbrennungskraftmaschine qualitativ bestimmt. Da die NOx-Sensoren nur mit großer Verzögerung aktuelle NOx-Werte liefern, dauert das Verfahren sehr lange. Derzeit wird vielfach gefordert, dass die Qualitätserkennung der Reduktionsmittellösung deutlich schneller erfolgen soll. Sollte eine entsprechende Erkennungszeit gesetzlich festgeschrieben werden, so wäre die Qualitätserkennung über die NOx-Sensoren nicht mehr möglich. The refueling of water is currently qualitatively determined via NOx sensors in the exhaust gas region of the internal combustion engine. Since the NOx sensors supply current NOx values only with great delay, the process takes a long time. At present it is often demanded that the quality recognition of the reducing agent solution should take place much faster. If a corresponding detection time is stipulated by law, quality detection via the NOx sensors would no longer be possible.
Offenbarung der ErfindungDisclosure of the invention
Die erfindungsgemäße Vorrichtung zur gleichzeitigen Füllstandsbestimmung und Qualitätsbestimmung in der Reduktionsmittellösung umfasst einen Tank zur Aufnahme der Reduktionsmittellösung, indem parallel zum Boden des Tanks ein erster Ultraschallwandler angeordnet ist. Als Boden des Tanks wird erfindungsgemäß eine Bodenfläche verstanden, die bei ruhendem, mit Reduktionsmittellösung gefülltem Tank parallel zur Flüssigkeitsoberfläche angeordnet ist. Weiterhin ist in dem Tank ein zweiter Ultraschallwandler angeordnet. Ein Referenzziel ist so eingerichtet, dass es ein vom zweiten Ultraschallwandler ausgesandtes Ultraschallsignal zum zweiten Ultraschallwandler zurückreflektiert wird. Weiterhin sind der erste Ultraschallwandler und der zweite Ultraschallwandler so angeordnet, dass sich ein vom ersten Ultraschallwandler ausgesandtes erstes Ultraschallsignal und ein vom zweiten Ultraschallwandler ausgesandtes zweites Ultraschallsignal kreuzen, d.h., dass es zu einer teilweisen Überlappung der Signale kommt. Die gleichzeitige Füllstandsbestimmung und Qualitätsbestimmung der Reduktionsmittellösung gemäß der Erfindung kann nun erfolgen, indem der erste Ultraschallwandler ein erstes Ultraschallsignal aussendet, welches an der Oberfläche der Reduktionsmittellösung zum ersten Ultraschallwandler zurückreflektiert wird. Der Füllstand der Reduktionsmittellösung wird dann aus der Laufzeit des ersten Ultraschallsignals ermittelt. Der zweite Ultraschallwandler sendet ein zweites Ultraschallsignal aus, welches am Referenzziel zum zweiten Ultraschallwandler zurückreflektiert wird. Die Dichte der Reduktionsmittellösung kann aus der Laufzeit des zweiten Ultraschallsignals ermittelt werden. Aufgrund der Dichte ist beispielsweise ein Rückschluss auf die Konzentration einer Harnstoffwasserlösung möglich. Auf jeden Fall ist eine Unterscheidung zwischen einer Harnstoffwasserlösung und reinem Wasser möglich. Die erfindungsgemäße Anordnung des ersten Ultraschallwandlers und des zweiten Ultraschallwandlers führt zu einem besonders kompakten Aufbau der erfindungsgemäßen Vorrichtung, welcher die Unterbringung auch in beengten Einbauräumen im Reduktionsmitteltank ermöglicht.The device according to the invention for simultaneous filling level determination and quality determination in the reducing agent solution comprises a tank for receiving the reducing agent solution in that a first ultrasonic transducer is arranged parallel to the bottom of the tank. According to the invention, the bottom of the tank is understood to be a bottom surface which is arranged parallel to the liquid surface when the tank is filled with a reducing agent solution. Furthermore, a second ultrasonic transducer is arranged in the tank. A reference target is set up so that an ultrasound signal emitted by the second ultrasound transducer is reflected back to the second ultrasound transducer. Furthermore, the first ultrasonic transducer and the second ultrasonic transducer arranged so that a first ultrasonic transducer emitted by the first ultrasonic signal and a second ultrasonic transducer emitted by the second ultrasonic signal intersect, that is, that there is a partial overlap of the signals. The simultaneous filling level determination and quality determination of the reducing agent solution according to the invention can now be carried out by the first ultrasonic transducer emitting a first ultrasonic signal which is reflected back to the surface of the reducing agent solution to the first ultrasonic transducer. The level of the reducing agent solution is then determined from the transit time of the first ultrasonic signal. The second ultrasonic transducer emits a second ultrasonic signal, which is reflected back to the reference target to the second ultrasonic transducer. The density of the reducing agent solution can be determined from the transit time of the second ultrasonic signal. Due to the density, for example, a conclusion on the concentration of a urea water solution is possible. In any case, a distinction between a urea water solution and pure water is possible. The inventive arrangement of the first ultrasonic transducer and the second ultrasonic transducer leads to a particularly compact design of the device according to the invention, which allows housing even in confined spaces in the reducing agent tank.
Aus der Laufzeit des zweiten Ultraschallsignals kann außerdem auf die Schallgeschwindigkeit in der Reduktionsmittellösung geschlossen werden. Dies ermöglicht es, den Füllstand der Reduktionsmittellösung mittels des ersten Ultraschallsignals mit besonders hoher Genauigkeit zu bestimmen, wenn bei der Auswertung der Laufzeit des ersten Ultraschallsignals die zeitgleich ermittelte Schallgeschwindigkeit in der Reduktionsmittellösung berücksichtigt wird. Es ist deshalb erfindungsgemäß bevorzugt, dass der erste Ultraschallwandler und der zweite Ultraschallwandler mit einem gemeinsamen Steuergerät verbunden sind. Dies ermöglicht es, die Schallgeschwindigkeit in der Reduktionsmittellösung, welche mit Hilfe des zweiten Ultraschallwandlers ermittelt werden kann, bei der Auswertung der Laufzeit des Ultraschallsignals des ersten Ultraschallwandlers zu berücksichtigen. Außerdem ist die Vorrichtung durch den Verzicht auf jeweils ein separates Steuergerät für jeden Ultraschallwandler besonders platzsparend.From the duration of the second ultrasonic signal can also be concluded that the speed of sound in the reducing agent solution. This makes it possible to determine the filling level of the reducing agent solution by means of the first ultrasonic signal with particularly high accuracy, if the simultaneously determined sound velocity in the reducing agent solution is taken into account in the evaluation of the transit time of the first ultrasonic signal. It is therefore preferred according to the invention that the first ultrasonic transducer and the second ultrasonic transducer are connected to a common control device. This makes it possible to take into account the speed of sound in the reducing agent solution, which can be determined with the aid of the second ultrasonic transducer, in the evaluation of the transit time of the ultrasonic signal of the first ultrasonic transducer. In addition, the device is particularly space-saving by dispensing with a separate control unit for each ultrasonic transducer.
Um den Abstand zwischen dem zweiten Ultraschallwandler und dem Referenzziel besonders kurz wählen zu können und die erfindungsgemäße Vorrichtung so noch platzsparender zu gestalten, ist es erfindungsgemäß bevorzugt, dass die erfindungsgemäße Vorrichtung weiterhin ein Umlenkmittel umfasst. Dieses ist so angeordnet, dass es ein vom zweiten Ultraschallwandler ausgesandtes Ultraschallsignal auf das Referenzziel umlenkt. Je nach Anordnung des Umlenkmittels und des Referenzzieles wird das Ultraschallsignal vom Referenzziel direkt oder über das Umlenkmittel zum Ultraschallwandler zurück reflektiert. Auf diese Weise kann bei gleichbleibender Messstrecke zwischen zweitem Ultraschallwandler und Referenzziel der Abstand zwischen zweitem Ultraschallwandler und Referenzziel verkürzt werden.In order to be able to select the distance between the second ultrasonic transducer and the reference target particularly short and to make the device according to the invention even more space-saving, it is inventively preferred that the inventive device further comprises a deflection. This is arranged so that it deflects an emitted from the second ultrasonic transducer ultrasonic signal to the reference target. Depending on the arrangement of the deflection means and the reference target, the ultrasonic signal is reflected back from the reference target directly or via the deflection means to the ultrasonic transducer. In this way, with a constant measuring distance between the second ultrasonic transducer and the reference target, the distance between the second ultrasonic transducer and the reference target can be shortened.
Zur Verbesserung der Füllstandshöhenbestimmung ist erfindungsgemäß bevorzugt, dass der erste Ultraschallwandler in einem Schallführungsrohr angeordnet ist. Die Längsachse des Schallführungsrohrs ist in einem Winkel von 90° zum Boden des Reduktionsmitteltanks angeordnet. Sowohl das Referenzziel als auch ein eventuell vorhandenes Umlenkmittel können in das Schallführungsrohr integriert sein, um eine besonders platzsparende Ausgestaltung der erfindungsgemäßen Vorrichtung zu ermöglichen.In order to improve the fill level height determination, it is preferred according to the invention for the first ultrasonic transducer to be arranged in a sound guide tube. The longitudinal axis of the sound guide tube is arranged at an angle of 90 ° to the bottom of the reducing agent tank. Both the reference target and any deflection means may be integrated in the sound guide tube in order to allow a particularly space-saving design of the device according to the invention.
Das Verfahren zur Steuerung des ersten Ultraschallwandlers zur Aussendung eines ersten Ultraschallsignals und des zweiten Ultraschallwandlers zur Aussendung eines zweiten Ultraschallsignals sowie zur Auswertung der Laufzeiten des ersten Ultraschallsignals und des zweiten Ultraschallsignals kann von einem Computerprogramm ausgeführt werden, wenn es auf einem Rechengerät abläuft. Erfindungsgemäß ist außerdem ein Computerprogrammprodukt mit Programmcode vorgesehen, das auf einem maschinenlesbaren Träger gespeichert ist, zur Durchführung dieses Verfahrens, wenn das Programm auf einem Computer oder einem Steuergerät ausgeführt wird, insbesondere auf einem gemeinsamen Steuergerät des ersten Ultraschallwandlers und des zweiten Ultraschallwandlers.The method for controlling the first ultrasound transducer for emitting a first ultrasound signal and the second ultrasound transducer for emitting a second ultrasound signal and for evaluating the transit times of the first ultrasound signal and the second ultrasound signal can be executed by a computer program when it runs on a computing device. The invention also provides a computer program product with program code, which is stored on a machine-readable carrier, for carrying out this method when the program is executed on a computer or a control unit, in particular on a common control unit of the first ultrasonic transducer and the second ultrasonic transducer.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert.Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description.
Ausführungsformen der ErfindungEmbodiments of the invention
Claims (10)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE102011086774A DE102011086774A1 (en) | 2011-11-22 | 2011-11-22 | Device for simultaneous determination of level and quality of urea water solution for diesel engine, has ultrasonic transducers arranged in tank such that ultrasonic signals emitted by ultrasonic transducers overlap each other |
FR1261005A FR2982946A1 (en) | 2011-11-22 | 2012-11-20 | DEVICE AND METHOD FOR SIMULTANEOUSLY DETERMINING THE FILLING LEVEL AND THE QUALITY OF A REDUCING AGENT SOLUTION |
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Application Number | Priority Date | Filing Date | Title |
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DE102011086774A DE102011086774A1 (en) | 2011-11-22 | 2011-11-22 | Device for simultaneous determination of level and quality of urea water solution for diesel engine, has ultrasonic transducers arranged in tank such that ultrasonic signals emitted by ultrasonic transducers overlap each other |
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DE102011086774A1 true DE102011086774A1 (en) | 2013-05-23 |
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DE102011086774A Withdrawn DE102011086774A1 (en) | 2011-11-22 | 2011-11-22 | Device for simultaneous determination of level and quality of urea water solution for diesel engine, has ultrasonic transducers arranged in tank such that ultrasonic signals emitted by ultrasonic transducers overlap each other |
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DE (1) | DE102011086774A1 (en) |
FR (1) | FR2982946A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015181105A1 (en) * | 2014-05-27 | 2015-12-03 | Continental Automotive Gmbh | Device for determining a height of the surface of a fluid in a fluid container |
DE102014210077A1 (en) * | 2014-05-27 | 2015-12-03 | Continental Automotive Gmbh | Apparatus and method for determining a height of a fluid surface in a fluid container |
CN105452821A (en) * | 2013-07-30 | 2016-03-30 | 大陆汽车有限责任公司 | Method for manufacturing a tank with a calibrated sensor |
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-
2011
- 2011-11-22 DE DE102011086774A patent/DE102011086774A1/en not_active Withdrawn
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2012
- 2012-11-20 FR FR1261005A patent/FR2982946A1/en not_active Withdrawn
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