DE102012204389A1 - Method for monitoring level of aqueous urea solution in reducing agent tank of motor vehicle, involves determining mass of water solution removed from reducing agent tank, and computing level of solution from measured level and mass - Google Patents
Method for monitoring level of aqueous urea solution in reducing agent tank of motor vehicle, involves determining mass of water solution removed from reducing agent tank, and computing level of solution from measured level and mass Download PDFInfo
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- DE102012204389A1 DE102012204389A1 DE201210204389 DE102012204389A DE102012204389A1 DE 102012204389 A1 DE102012204389 A1 DE 102012204389A1 DE 201210204389 DE201210204389 DE 201210204389 DE 102012204389 A DE102012204389 A DE 102012204389A DE 102012204389 A1 DE102012204389 A1 DE 102012204389A1
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- level
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- reducing agent
- agent tank
- mass
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- G01F23/80—Arrangements for signal processing
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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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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Überwachung eines Füllstandes eines mit einer Flüssigkeit gefüllten Behälters, insbesondere eines Reduktionsmitteltanks in einem SCR-Katalysatorsystem. 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 invention relates to a method for monitoring a filling level of a container filled with a liquid, in particular a reducing agent tank in an SCR catalyst system. 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, Stickstoffdioxide im Abgas von Verbrennungskraftmaschinen, insbesondere von Dieselmotoren, zu verringern. Hierzu ist es bekannt, im Abgasbereich von Verbrennungskraftmaschinen einen SCR-Katalysator (Selective Catalytic Reduction) anzuordnen, der in dem Abgas der Verbrennungskraftmaschine enthaltene Stickoxide (NOx) in Gegenwart eines Reduktionsmittels zu Stickstoff reduziert. Hierdurch kann der Anteil von Stickoxid im Abgas erheblich verringert werden. Für den Ablauf der 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; HWL) 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 in the exhaust gas of internal combustion engines, especially diesel engines. For this purpose, it is known to arrange in the exhaust area of internal combustion engines an SCR catalyst (Selective Catalytic Reduction), which reduces nitrogen oxides (NO x ) 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 the 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, HWL) is used for this, which is injected in the exhaust 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 ®.
Bei einer Umgebungstemperatur von weniger als –11°C kann diese Harnstoffwasserlösung im Reduktionsmitteltank eines Kraftfahrzeuges gefrieren. Das Auftauen der gefrorenen Harnstoffwasserlösung wird in der Regel durch eine Heizung realisiert. Da diese Heizung üblicherweise im unteren Bereich des Reduktionsmitteltankes angeordnet ist, kann es dazu kommen, dass ein Teil der Harnstoffwasserlösung am Tankboden bereits aufgetaut ist, während sich darüber noch eine Schicht aus gefrorener Reduktionsmittellösung befindet. In diesem Fall liefert ein Füllstandssensor, welcher in dem Reduktionsmitteltank angeordnet ist, um dessen Befüllung zu messen, eine falsche Bestimmung der in dem Tank verbliebenen Flüssigkeitsmasse.At an ambient temperature of less than -11 ° C, this urea water solution can freeze in the reducing agent tank of a motor vehicle. The thawing of the frozen urea water solution is usually realized by a heater. Since this heater is usually arranged in the lower region of the reducing agent tank, it may happen that a part of the urea water solution is already thawed at the tank bottom, while there is still a layer of frozen reducing agent solution. In this case, a level sensor, which is arranged in the reducing agent tank to measure its filling, provides an incorrect determination of the liquid mass remaining in the tank.
Offenbarung der ErfindungDisclosure of the invention
Das erfindungsgemäße Verfahren zur Überwachung eines Füllstandes eines mit einer Flüssigkeit gefüllten Behälters, insbesondere eines Reduktionsmitteltanks in einem SCR-Katalysatorsystem, umfasst das Messen des Füllstandes mittels eines Füllstandssensors, das Bestimmen, ob die Flüssigkeit zumindest teilweise gefroren ist, das Speichern des zuletzt gemessenen Füllstandes, sobald darauf erkannt wurde, dass die Flüssigkeit zumindest teilweise gefroren ist, das Bestimmen einer dem Behälter entnommenen Flüssigkeitsmasse ab dem Zeitpunkt zu dem darauf erkannt wurde, dass die Flüssigkeit zumindest teilweise gefroren ist, und das Berechnen des Füllstandes aus dem zuletzt gemessenen Füllstand und der eindosierten Flüssigkeitsmasse. Die eindosierte Flüssigkeitsmasse kann, wenn es sich bei dem Behälter um den Reduktionsmitteltank eines SCR-Katalysatorsystems handelt, beispielsweise der Software eines Steuergeräts entnommen werden.The method according to the invention for monitoring a fill level of a container filled with a liquid, in particular a reducing agent tank in an SCR catalyst system, comprises measuring the fill level by means of a fill level sensor, determining whether the liquid is at least partially frozen, storing the last measured fill level, once it has been recognized that the liquid has been at least partially frozen, determining a liquid mass taken from the container from the time it was detected that the liquid is at least partially frozen, and calculating the level from the last measured fill level and the metered level liquid mass. The metered-in liquid mass, if the container is the reducing agent tank of an SCR catalyst system, can be taken from the software of a control unit, for example.
Wenn darauf erkannt wurde, dass die Flüssigkeit zumindest teilweise gefroren ist, wird das Signal des Füllstandssensors vorzugsweise nicht mehr zur Füllstandsbestimmung herangezogen.If it was recognized that the liquid is at least partially frozen, the signal of the level sensor is preferably no longer used for level determination.
Sobald der Tankinhalt vollständig aufgetaut ist, kann der Füllstand des Behälters in herkömmlicher Weise mittels des Füllstandssensors gemessen werden.Once the tank contents are completely thawed, the level of the container can be measured in a conventional manner by means of the level sensor.
Das erfindungsgemäße Computerprogramm, das alle Schritte des erfindungsgemäßen Verfahrens ausführt, wenn es auf einem Rechengerät abläuft, ermöglicht die nachträgliche Implementierung des erfindungsgemäßen Verfahrens in einem vorhandenen Behälter mit Füllstandssensor. Hierzu dient das erfindungsgemäße Computerprogrammprodukt mit Programmcode, der auf einem maschinenlesbaren Träger gespeichert ist, zur Durchführung des erfindungsgemäßen Verfahrens, wenn das Programm auf einem Computersteuergerät ausgeführt wird.The computer program according to the invention, which executes all the steps of the method according to the invention, when it runs on a computing device, enables the subsequent implementation of the method according to the invention in an existing container with fill level sensor. For this purpose, the inventive 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 computer control unit.
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
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE201210204389 DE102012204389A1 (en) | 2012-03-20 | 2012-03-20 | Method for monitoring level of aqueous urea solution in reducing agent tank of motor vehicle, involves determining mass of water solution removed from reducing agent tank, and computing level of solution from measured level and mass |
Applications Claiming Priority (1)
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DE201210204389 DE102012204389A1 (en) | 2012-03-20 | 2012-03-20 | Method for monitoring level of aqueous urea solution in reducing agent tank of motor vehicle, involves determining mass of water solution removed from reducing agent tank, and computing level of solution from measured level and mass |
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DE102012204389A1 true DE102012204389A1 (en) | 2013-09-26 |
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DE201210204389 Pending DE102012204389A1 (en) | 2012-03-20 | 2012-03-20 | Method for monitoring level of aqueous urea solution in reducing agent tank of motor vehicle, involves determining mass of water solution removed from reducing agent tank, and computing level of solution from measured level and mass |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015097526A1 (en) * | 2013-12-25 | 2015-07-02 | Toyota Jidosha Kabushiki Kaisha | Liquid quantity detecting device |
CN110736526A (en) * | 2019-11-22 | 2020-01-31 | 西安航天计量测试研究所 | High-temperature gas flowmeter calibration device and method for liquid oxygen kerosene engine |
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2012
- 2012-03-20 DE DE201210204389 patent/DE102012204389A1/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015097526A1 (en) * | 2013-12-25 | 2015-07-02 | Toyota Jidosha Kabushiki Kaisha | Liquid quantity detecting device |
CN110736526A (en) * | 2019-11-22 | 2020-01-31 | 西安航天计量测试研究所 | High-temperature gas flowmeter calibration device and method for liquid oxygen kerosene engine |
CN110736526B (en) * | 2019-11-22 | 2020-12-01 | 西安航天计量测试研究所 | High-temperature gas flowmeter calibration device and method for liquid oxygen kerosene engine |
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