DE3706453A1 - Liquid-level signal transmitter for motor vehicles - Google Patents
Liquid-level signal transmitter for motor vehiclesInfo
- Publication number
- DE3706453A1 DE3706453A1 DE19873706453 DE3706453A DE3706453A1 DE 3706453 A1 DE3706453 A1 DE 3706453A1 DE 19873706453 DE19873706453 DE 19873706453 DE 3706453 A DE3706453 A DE 3706453A DE 3706453 A1 DE3706453 A1 DE 3706453A1
- Authority
- DE
- Germany
- Prior art keywords
- measurement signal
- liquid
- measurement
- level sensor
- motor vehicles
- 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- Withdrawn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
- 239000007788 liquid Substances 0.000 title claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 43
- 238000002604 ultrasonography Methods 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Füllstandsgeber nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a level sensor according to the Preamble of claim 1.
Derartige Füllstandsgeber sind im Prinzip aus der DE-OS 34 40 513, der DE-OS 34 05 080 und der DE-OS 24 33 133 bekannt. Das Meßsignal ist vorzugsweise ein Ultraschallsignal. Es kann aber auch ein sichtbares oder unsichtbares Lichtsignal Anwendung finden. Mit Hilfe der Laufzeit wird die Laufstrecke bestimmt. Maßgeblich hierfür ist der lineare Zusammenhang zwischen beiden größen. Der zugehörige Proportionalitätsfaktor ist die Ausbreitungsgeschwindigkeit des Meßsignals in dem jeweiligen Medium. Diese ist jedoch von verschiedenen Einflußgrößen abhängig. Hierzu zählt die Dichte und insbesondere die Temperatur des Mediums. Um einen derartigen Einfluß zu elimieren, ist bereits vorgeschlagen worden, die Temperatur des Mediums mit Hilfe eines separaten Temperaturgebers zu bestimmten (vgl. Siemens-Kundenschrift "Füllstandsanzeige mit Ultraschall von 7/86"). Ein derartiger Füllstandsgeber ist jedoch besonders aufwendig und besitzt darüber hinaus den Nachteil, daß Änderungen hinsichtlich der charakteristik des Temperaturgebers einen unvorhergesehenen negativen Einfluß auf das Meßergebnis besitzen.Such level sensors are in principle from the DE-OS 34 40 513, DE-OS 34 05 080 and DE-OS 24 33 133 known. The measurement signal is preferably a Ultrasound signal. But it can also be a visible or invisible light signal find application. With the help of Running time, the running distance is determined. The decisive factor here is the linear relationship between the two quantities. The the corresponding proportionality factor is Speed of propagation of the measurement signal in the respective Medium. However, this is of various influencing factors dependent. This includes density and especially that Temperature of the medium. To have such an influence to eliminate, the temperature has already been suggested the medium with the help of a separate temperature sensor certain (see Siemens customer specification "Level indicator with Ultrasound of 7/86 "). However, such a level sensor is particularly complex and also has the disadvantage that changes in the characteristics of the Temperature sensor an unforeseen negative influence own the measurement result.
Der Erfindung liegt die Aufgabe zugrunde, einen Füllstandsgeber der eingangs genannten Art zu schaffen, der auf konstruktiv einfache Weise eine präzise Aussage über die zu bestimmende Laufzeit und damit über den Füllstand liefert.The invention has for its object a To create level sensor of the type mentioned, the a precise, constructive statement about the delivers the runtime to be determined and thus the fill level.
Die Erfindung löst die Aufgabe durch die kennzeichnenden Merkmale des Patentanspruchs 1.The invention solves the problem by the characterizing Features of claim 1.
Durch die Erfindung wird die Bestimmung der Laufzeit des Meßsignals mit der des Referenzsignals in Beziehung gesetzt. Dieser in der Regel als Quotient vorliegende Bezug ist identish mit der Beziehung zwischen der Laufstrecke des Meßsignals und der des Referenzsignals. Die Ausbreitungsgeschwindigkeit des Meßsignals ist dabei ohne Belang. Damit entfällt auch der Einfluß jeglicher Störgrößen auf diese Aufbreitungsgeschwindigkeit. Wesentlich ist lediglich, daß Meß- und Referenzsignal, zumindest soweit es für die genannte Beziehung von Bedeutung ist, in ein und demselben Medium verlaufen.The invention determines the duration of the Measurement signal related to that of the reference signal. This reference is usually present as a quotient identical with the relationship between the running distance of the Measurement signal and that of the reference signal. The The speed of propagation of the measurement signal is without Matter. This also eliminates the influence of any disturbance variables to this spreading speed. The only essential thing is that measurement and reference signal, at least as far as it is for the referred relationship is important in one and the same Medium run.
Die Referenzlaufstrecke kann auf unterschiedliche Weise ausgebildet sein. Auf konstruktiv besonders einfache Weise kann diese mit Hilfe eines Reflektors im Wege des Meßsignals definiert sein. Dieser Reflektor kann die Referenzlaufstrecke gegenüber der Laufstrecke des Meßsignals verkürzen. Alternativ dazu kann er auch in Verbindung mit mindestens einem weiteren Reflektor diese Laufstrecke auch ausdehnen.The reference run can be done in different ways be trained. In a structurally particularly simple way can this with the help of a reflector in the way of the measurement signal be defined. This reflector can be the reference running distance shorten compared to the running distance of the measurement signal. Alternatively, it can also be used in conjunction with at least Another reflector can also extend this route.
Es kann dabei insbesondere eine Faltung der Referenzlaufstrecke erzielt werden. Damit ergibt sich die Möglichkeit, die Referenzlaufstrecke hinsichtlich ihrer Länge entsprechend den jeweiligen konstruktiven Gegebenheitnen, beispielsweise des Flüssigkeitsbehälters, einzustellen. Die damit erzielbare optimale Länge kann beispielsweise hinsichtlich des Meßfehlers eingestellt werden. Hierbei kann es besonders vorteilhaft sen, die Referenzlaufstrecke gleich der mittleren Laufstrecke des Meßsignals einzurichten. Der daraus resultierende minimale Meßfehler ist dadurch bedingt, daß Ein- und Ausschwingvorgänge für den Sender und den Empfänger des Meßsignals weitgehend ohne Einfluß auf das Ergebnis bleiben.It can in particular fold the Reference running distance can be achieved. This results in the Possibility of the reference distance in terms of its length according to the respective structural conditions, for example, the liquid container. The one with it achievable optimal length can, for example, with regard to the Measurement error can be set. Here it can be special advantageous sen, the reference distance equal to the middle Set up the route of the measurement signal. The one out of it resulting minimal measurement error is due to the fact that and swing-out processes for the transmitter and the receiver of the measurement signal largely without influence on the result stay.
In der Zeichnung ist ein Auführungsbeispiel der Erfindung dargestellt. Es zeigtIn the drawing is an embodiment of the invention shown. It shows
Fig. 1 schematisch einen Füllstandsgeber gemäß der Erfindung und Fig. 1 shows schematically a level sensor according to the invention and
Fig. 2 eine Alternative zum Füllstandsgeber von Fig. 1. FIG. 2 shows an alternative to the level sensor from FIG. 1.
Beim Ausführungsbeispiel von Fig. 1 befindet sich in einem Flüssigkeitsbehälter, beispielsweise einem Kraftstofftank 1 ein Füllstandsgeber 2, der einen Ultraschallsender/-empfänger 3 sowie ein als akustischer Wellenleiter dienendes Schutzrohr 4 umfaßt. Ferner it als Teil des Füllstandsgebers 2 innerhalb des Schutzrohrs 4 ein als Reflektor dienender Vorsprung 5 ausgebildet, der sich in einem definierten Abstand 1 vom Teil 3 befindet.In the exemplary embodiment of FIG. 1, a level sensor 2 is located in a liquid container, for example a fuel tank 1 , which comprises an ultrasonic transmitter / receiver 3 and a protective tube 4 serving as an acoustic waveguide. Furthermore, as part of the level sensor 2, a protrusion 5 serving as a reflector is formed within the protective tube 4 and is located at a defined distance 1 from the part 3 .
Ein vom Ultraschallsender/-empfänger 3 ausgesandtes Ultraschall-Meßsignal wird einerseits am Vorsprung 5 und andererseits an der Oberfläche 6 der Flüssigkeit (hier: Kraftstoff) 7 reflektiert. Das an der Oberfläche 6 reflektierte Meßsignal gelangt nach einer von der Höhe h der Oberfläche abhängigen Laufzeit zum Ultraschallempfänger 3 zurück. Seine Laufzeit ergibt sich als der Quotient aus der Ausbreitungsgeschwindigkeit des Meßsignals in der jeweiligen Flüssigkeit und der zweifachen Höhe h. Entsprechendes gilt für den Teil des Meßsignals, der am Vorsprung 5 reflektiert und mit dem Ultraschallempfänger 3 aufgenommen wird. Dessen Laufzeit ist der Quotient aus der Ausbreitungsgeschwindigkeit und dem zweifachen Wert der Entfernung l. Damit aber ergibt sich, daß der Quotient aus den beiden Laufzeiten unabhängig von der Ausbreitungsgeschwindigkeit des Meßsignals in der jeweiligen Flüssigkeit und lediglich durch das Verhältnis der Entfernungen hk und l bestimmt ist. Da l konstant und bekannt ist, läßt sich damit die Höheh und damit der Füllstand innerhalbdes Flüssigkeitsbehälters 1 ohne weiteres bestimmen. Das Ergebnis ist unabhängig von der Ausbreitungsgeschwindigkeit und damit auch unabhängig von den Einflußgrößen, wie beispielsweise die Temperatur der Flüssigkeit.An ultrasound measurement signal emitted by the ultrasound transmitter / receiver 3 is reflected on the one hand on the projection 5 and on the other hand on the surface 6 of the liquid (here: fuel) 7 . The light reflected at the surface 6 measured signal reaches after a of the height of the surface dependent travel time for the ultrasonic receiver 3 h back. Its transit time results from the quotient of the speed of propagation of the measurement signal in the respective liquid and twice the height h . The same applies to the part of the measurement signal which is reflected on the projection 5 and recorded with the ultrasound receiver 3 . Its transit time is the quotient of the speed of propagation and twice the value of the distance l . However, this means that the quotient of the two transit times is determined independently of the speed of propagation of the measurement signal in the respective liquid and only by the ratio of the distances hk and l . Since l is constant and known, the height h and thus the fill level within the liquid container 1 can be determined without further ado. The result is independent of the speed of propagation and thus also independent of the influencing variables, such as the temperature of the liquid.
Beim Ausführungsbeispiel von Fig. 2 ist innerhalb der Laufstrecke des Meßsignals zwischen dem Ultraschallsender/-empfänger 3 und der Oberfläche 6 ein Reflektor 8 angeordnet, der einen Teil des Meßsignals um 90° umlenkt und parallel zur Oberfläche 6 verlaufen läßt. Dieser Teil durchquert die Flüssigkeit und wird an einer gegenüberliegenden Wand 1′ reflektiert. Auf dem umgekehrten Weg gelangt dieser Teil des Meßsignals zum Ultraschallsender/-empfänger 3 zurück.In the embodiment of FIG. 2, a reflector 8 is arranged within the path of the measurement signal between the ultrasound transmitter / receiver 3 and the surface 6 , which deflects part of the measurement signal by 90 ° and allows it to run parallel to the surface 6 . This part crosses the liquid and is reflected on an opposite wall 1 ' . In the opposite way, this part of the measurement signal returns to the ultrasound transmitter / receiver 3 .
Die für den Teil des Meßsignals maßgebliche Referenzlaufstrecke 9, der durch den Reflektor 8 gestreut wird, ist gegenüber Fig. 1 wesentlich vergrößert. Damit aber wird der Meßfehler deutlich verringert. Dieser ist im wesentlichen bestimmt durch Ein- und Ausschwingvorgänge des Ultraschallsenders/-empfängers 3.The reference run 9 , which is relevant for the part of the measurement signal and which is scattered by the reflector 8 , is substantially enlarged compared to FIG. 1. But this significantly reduces the measurement error. This is essentially determined by the swing-in and swing-out processes of the ultrasound transmitter / receiver 3 .
Beim Ausführungsbeispiel von Fig. 2 fehlt ein akustischer Wellenleiter entsprechend dem Schutzrohr 4 von Fig. 1. Dieses ist auch beim Ausführungsbeispiel von Fig. 1 entbehrlich. Bei seinem Fehlen ergibt sich der Vorteil, daß nur dann ein an der Oberfläche 6 reflektiertes Meßsignal in den Ultraschallempfänger 3 gelangt, wenn sich die Oberfläche zumindest annähernd in einer waagrechten Lage befindet. Das Auftreten eines reflektierten Meßsignals während aufeinanderfolgender Meßtakte bietet dadurch die Gewähr dafür, daß die Oberfläche 6 waagrecht verläuft und dieser Zustand für die durch die Meßtakte definierte Meßzeit vorliegt. Damit aber ergibt sich, daß das Meßergebnis exakt ist und nicht durch Veränderungen des Flüssigkeitsspiegels infolge von Beschleunigungen beeinflußt ist.In the embodiment of FIG. 2, an acoustic waveguide corresponding to the protective tube 4 of FIG. 1 is missing . This is also unnecessary in the embodiment of FIG. 1. In the absence of this, there is the advantage that a measurement signal reflected on the surface 6 only reaches the ultrasound receiver 3 when the surface is at least approximately in a horizontal position. The occurrence of a reflected measurement signal during successive measurement cycles thus guarantees that the surface 6 runs horizontally and that this state is present for the measurement time defined by the measurement cycles. However, this means that the measurement result is exact and is not influenced by changes in the liquid level as a result of accelerations.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873706453 DE3706453A1 (en) | 1987-02-27 | 1987-02-27 | Liquid-level signal transmitter for motor vehicles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873706453 DE3706453A1 (en) | 1987-02-27 | 1987-02-27 | Liquid-level signal transmitter for motor vehicles |
Publications (1)
Publication Number | Publication Date |
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DE3706453A1 true DE3706453A1 (en) | 1988-09-08 |
Family
ID=6321972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE19873706453 Withdrawn DE3706453A1 (en) | 1987-02-27 | 1987-02-27 | Liquid-level signal transmitter for motor vehicles |
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Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3912783A1 (en) * | 1989-04-19 | 1990-10-25 | Bayerische Motoren Werke Ag | Motor vehicle level measurement arrangement - has immersed transmitter of constant ultrasonic signal in tank parallel to receiver at constant distance |
DE4025326A1 (en) * | 1990-05-10 | 1991-11-14 | Krieg Gunther | Level measurement, esp. in vehicle engine sump - using detection of ultrasonic pulses transmitted through liquid and reflected back from surface |
US5319973A (en) * | 1993-02-02 | 1994-06-14 | Caterpillar Inc. | Ultrasonic fuel level sensing device |
FR2751744A1 (en) * | 1996-07-26 | 1998-01-30 | Marwal Systems | PIEZOELECTRIC LIQUID GAUGE DEVICE |
EP1081470A1 (en) * | 1999-09-04 | 2001-03-07 | Mannesmann VDO AG | Apparatus for the measurement of liquid level in a tank |
DE10217934A1 (en) * | 2002-04-22 | 2003-11-06 | Uwe Seepe | Ultrasonic liquid level determination device comprises an instrument with a digital sampling frequency that is at least three times the sound frequency so that the sound velocity can be precisely determined from fixed reflectors |
DE10061531B4 (en) * | 2000-12-11 | 2007-04-05 | Robert Seuffer Gmbh & Co. Kg | Method and device for measuring a level of liquid in a container that changes as a result of operating consumption |
DE102009036888A1 (en) * | 2009-05-29 | 2010-12-02 | Hella Kgaa Hueck & Co. | Absorption cup for oil level measuring instrument of engine, particularly in motor vehicle, has surface within upper range, which is arranged opposite to measuring channel in absorption cup in angular manner |
DE102012205640A1 (en) * | 2012-01-05 | 2013-07-11 | Continental Automotive Gmbh | level sensor |
US20150000396A1 (en) * | 2012-03-16 | 2015-01-01 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Delivery unit with fill level sensor for a liquid additive, tank for storing liquid additive, motor vehicle and method for monitoring a fill level |
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 |
DE102014210080A1 (en) * | 2014-05-27 | 2015-12-03 | Continental Automotive Gmbh | Apparatus for determining a height of a fluid surface in a fluid container |
WO2015197792A1 (en) * | 2014-06-26 | 2015-12-30 | Continental Automotive Gmbh | Method for determining a liquid level and quality in a tank |
GB2539909A (en) * | 2015-06-30 | 2017-01-04 | Airbus Operations Ltd | Aircraft fuel measurement |
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DE2630789A1 (en) * | 1976-07-08 | 1978-01-12 | Ito Patent Ag | Measurement of liq. level in container - uses float with magnetic follower in gas filled tube defining end point of measured optical path |
GB2084322A (en) * | 1980-09-18 | 1982-04-07 | Avery Hardoll Ltd | Fluid measuring system |
DE3207305A1 (en) * | 1982-03-01 | 1983-09-15 | Interatom Internationale Atomreaktorbau Gmbh, 5060 Bergisch Gladbach | Magnetostrictive ultrasonic transducer, particularly for measuring the filling level in hot liquids |
DE3308180A1 (en) * | 1982-03-09 | 1983-09-22 | AC Spark Plug Overseas Corp., 48202 Detroit, Mich. | LOW FUEL INDICATOR SYSTEM |
DE3241033A1 (en) * | 1982-11-06 | 1984-05-10 | Dicom Electronics GmbH, 5000 Köln | Method for measuring the level of liquids in containers |
-
1987
- 1987-02-27 DE DE19873706453 patent/DE3706453A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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DE2630789A1 (en) * | 1976-07-08 | 1978-01-12 | Ito Patent Ag | Measurement of liq. level in container - uses float with magnetic follower in gas filled tube defining end point of measured optical path |
GB2084322A (en) * | 1980-09-18 | 1982-04-07 | Avery Hardoll Ltd | Fluid measuring system |
DE3207305A1 (en) * | 1982-03-01 | 1983-09-15 | Interatom Internationale Atomreaktorbau Gmbh, 5060 Bergisch Gladbach | Magnetostrictive ultrasonic transducer, particularly for measuring the filling level in hot liquids |
DE3308180A1 (en) * | 1982-03-09 | 1983-09-22 | AC Spark Plug Overseas Corp., 48202 Detroit, Mich. | LOW FUEL INDICATOR SYSTEM |
DE3241033A1 (en) * | 1982-11-06 | 1984-05-10 | Dicom Electronics GmbH, 5000 Köln | Method for measuring the level of liquids in containers |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3912783A1 (en) * | 1989-04-19 | 1990-10-25 | Bayerische Motoren Werke Ag | Motor vehicle level measurement arrangement - has immersed transmitter of constant ultrasonic signal in tank parallel to receiver at constant distance |
DE4025326A1 (en) * | 1990-05-10 | 1991-11-14 | Krieg Gunther | Level measurement, esp. in vehicle engine sump - using detection of ultrasonic pulses transmitted through liquid and reflected back from surface |
US5319973A (en) * | 1993-02-02 | 1994-06-14 | Caterpillar Inc. | Ultrasonic fuel level sensing device |
FR2751744A1 (en) * | 1996-07-26 | 1998-01-30 | Marwal Systems | PIEZOELECTRIC LIQUID GAUGE DEVICE |
WO1998004889A1 (en) * | 1996-07-26 | 1998-02-05 | Marwal Systems | Piezoelectric liquid gauging device |
US6427532B1 (en) | 1999-09-04 | 2002-08-06 | Mannesmann Vdo Ag | Device for measuring a fill level of a liquid in a container |
EP1081470A1 (en) * | 1999-09-04 | 2001-03-07 | Mannesmann VDO AG | Apparatus for the measurement of liquid level in a tank |
DE10061531B4 (en) * | 2000-12-11 | 2007-04-05 | Robert Seuffer Gmbh & Co. Kg | Method and device for measuring a level of liquid in a container that changes as a result of operating consumption |
DE10217934A1 (en) * | 2002-04-22 | 2003-11-06 | Uwe Seepe | Ultrasonic liquid level determination device comprises an instrument with a digital sampling frequency that is at least three times the sound frequency so that the sound velocity can be precisely determined from fixed reflectors |
DE102009036888A1 (en) * | 2009-05-29 | 2010-12-02 | Hella Kgaa Hueck & Co. | Absorption cup for oil level measuring instrument of engine, particularly in motor vehicle, has surface within upper range, which is arranged opposite to measuring channel in absorption cup in angular manner |
DE102009036888B4 (en) * | 2009-05-29 | 2020-02-20 | HELLA GmbH & Co. KGaA | Damping cup, oil level measuring device with such and motor vehicle with such an oil level measuring device |
US9719833B2 (en) | 2012-01-05 | 2017-08-01 | Continental Automotive Gmbh | Referential ultrasonic transceiver for acoustic measurement of a fluid level |
DE102012205640A1 (en) * | 2012-01-05 | 2013-07-11 | Continental Automotive Gmbh | level sensor |
DE102012205640B4 (en) | 2012-01-05 | 2018-05-30 | Continental Automotive Gmbh | level sensor |
US9897477B2 (en) * | 2012-03-16 | 2018-02-20 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Delivery unit with fill level sensor for a liquid additive, tank for storing liquid additive, motor vehicle and method for monitoring a fill level |
US20150000396A1 (en) * | 2012-03-16 | 2015-01-01 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Delivery unit with fill level sensor for a liquid additive, tank for storing liquid additive, motor vehicle and method for monitoring a fill level |
DE102014210080A1 (en) * | 2014-05-27 | 2015-12-03 | Continental Automotive Gmbh | Apparatus for determining a height of a fluid surface 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 |
US10101193B2 (en) | 2014-05-27 | 2018-10-16 | Continental Automotive Gmbh | Apparatus and method for determining a level of a fluid surface in a fluid container |
US10444057B2 (en) | 2014-05-27 | 2019-10-15 | Continental Automotive Gmbh | Device for determining a level of the surface of a fluid in a fluid container |
CN106461450A (en) * | 2014-06-26 | 2017-02-22 | 大陆汽车有限责任公司 | Method for determining liquid level and quality in tank |
WO2015197792A1 (en) * | 2014-06-26 | 2015-12-30 | Continental Automotive Gmbh | Method for determining a liquid level and quality in a tank |
US10234323B2 (en) | 2014-06-26 | 2019-03-19 | Continental Automotive Gmbh | Method for determining a liquid level and quality in a tank |
CN106461450B (en) * | 2014-06-26 | 2019-11-29 | 大陆汽车有限责任公司 | Method for determining liquid level and quality in storage tank |
GB2539909A (en) * | 2015-06-30 | 2017-01-04 | Airbus Operations Ltd | Aircraft fuel measurement |
US10480986B2 (en) | 2015-06-30 | 2019-11-19 | Airbus Operations Limited | Aircraft fuel measurement |
EP3112822B1 (en) * | 2015-06-30 | 2021-05-05 | Airbus Operations Limited | Aircraft fuel measurement |
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