WO2005100928A2 - Systeme et procede de mesure du niveau de remplissage d'un contenant rempli d'un liquide - Google Patents

Systeme et procede de mesure du niveau de remplissage d'un contenant rempli d'un liquide Download PDF

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Publication number
WO2005100928A2
WO2005100928A2 PCT/EP2005/004066 EP2005004066W WO2005100928A2 WO 2005100928 A2 WO2005100928 A2 WO 2005100928A2 EP 2005004066 W EP2005004066 W EP 2005004066W WO 2005100928 A2 WO2005100928 A2 WO 2005100928A2
Authority
WO
WIPO (PCT)
Prior art keywords
liquid container
vibration generator
measuring tube
liquid
vibration
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.)
Ceased
Application number
PCT/EP2005/004066
Other languages
German (de)
English (en)
Other versions
WO2005100928A3 (fr
Inventor
Eugen Schlötzer
Johann Ferstl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schlemmer GmbH
Original Assignee
Schlemmer GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schlemmer GmbH filed Critical Schlemmer GmbH
Priority to EP05735129A priority Critical patent/EP1740912A2/fr
Publication of WO2005100928A2 publication Critical patent/WO2005100928A2/fr
Publication of WO2005100928A3 publication Critical patent/WO2005100928A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves

Definitions

  • the present invention relates to a system and a method for level measurement of a liquid container according to the preamble of claim 1 and claim 15.
  • the present invention relates to a system and a method for level measurement of a fuel tank.
  • Known level sensors have, for example, a float which is attached to a lever arm. The level of the tank is determined by the deflection of the lever arm.
  • a disadvantage of this prior art is that the structure with the float requires a relatively large amount of installation space and is not wear-free.
  • a fill level measuring device for a liquid container is known from DE 200 22 911 U1.
  • a hollow body is arranged and designed such that liquid can rise from the liquid container into the hollow body.
  • the liquid level in the hollow body is proportional to the liquid level in the liquid container and is determined.
  • the liquid level in the hollow body is determined by ultrasound, in that an ultrasound generator sends ultrasound waves in the direction of the liquid level, which are reflected by the liquid on the surface. The reflected ultrasound waves are received and the liquid level determined from the running time.
  • a disadvantage of this known prior art is that the generation of ultrasound and the reception of ultrasound as well as the transit time measurement are complex and therefore expensive.
  • the measurement result is also falsified by the changing ambient pressure, since the hollow body is filled by the pressure of the liquid against the air cushion which is under pressure and which is under pressure.
  • the resonance frequency which depends on the liquid level, can advantageously be measured by simple and inexpensive components. Neither the vibration generator nor the vibration sensor come into contact with the liquid and the liquid sensor is not subject to wear. This advantageously takes advantage of the fact that both the resonance frequency of the air volume above a liquid level in a liquid container and the resonance frequency of the liquid container itself depend on the height of the liquid level and thus the filling. The measurement of one or both resonance frequencies therefore reliably enables the degree of filling to be measured.
  • the vibration generator can sweep the frequencies.
  • the occurrence of a resonance frequency is easy to determine, because then the vibration amplitude of the signal detected by the vibration sensor increases sharply
  • the vibration generator can excite vibrations over the entire frequency range of possible resonance frequencies.
  • a measuring tube having openings at two ends to the liquid container is advantageously arranged in the interior of the liquid container such that the liquid flows into the measuring tube via the lower opening to the same level as in the liquid container.
  • a ready-to-install unit can be formed and the resonance behavior of each form of a liquid container does not have to be measured.
  • a tubular measuring device is also easy to mount through an opening in the liquid container from above.
  • the frequency range comprises the resonance frequencies of the air column located above a liquid in the measuring tube or the resonance frequencies of the measuring tube.
  • the measuring tube can be arranged in the liquid container at its lowest point.
  • the elongated shape of a measuring tube makes it possible, rather than, for example, a lever measuring device, to measure reliably until the liquid container is completely emptied, since this can be mounted well down to the lowest point of the liquid container.
  • the vibration generator and the vibration sensor can advantageously be arranged on the wall of the liquid container and determine the resonance frequency of the liquid container itself.
  • the liquid level in the liquid container can be measured without an installation opening having to be provided or a component having to be brought into the interior of the liquid container.
  • the vibration generator and the vibration sensor can still be retrofitted.
  • FIG. 2 shows the system and the fuel tank of FIG. 1 schematically in a perspective, cut view
  • Fig. 3 shows a further embodiment of a system according to the invention in a fuel tank schematically in section
  • Fig. 4 shows a third embodiment of a system according to the invention with a fuel tank schematically in section.
  • FIG. 1 shows a first exemplary embodiment of a system 1 according to the invention in a liquid container, here a fuel tank 2, schematically in section.
  • the fuel tank 2 is filled up to a liquid level 3.
  • a measuring tube 5 is inserted into the fuel tank 2 via an opening 4.
  • At the upper end of the measuring tube 5 there is a loudspeaker or an acoustic source 16 as the vibration generator 6 and a microphone or an acoustic sink 9 as the vibration sensor 7.
  • the fuel can flow into the measuring tube 5 via an inlet opening 8 at the lower end of the measuring tube 5. until it has the same level in the measuring tube 5 as the liquid level 3.
  • the air can escape through a ventilation opening (not shown here) in the upper region of the measuring tube 5.
  • FIG 2 shows the system 1 and the fuel tank 2 of Figure 1 schematically in a perspective view.
  • the measuring tube 5 is inserted into the fuel tank 2 via the opening 4 and immersed in the liquid level 3, so that the fuel flows into the measuring tube 5 via the inlet opening 8 at the lower end of the measuring tube 5 until it has the same level in the measuring tube 5 ,
  • the loudspeaker 16 as a vibration generator 6
  • the microphone 9 as a vibration sensor 7.
  • the air column above the fuel in the measuring tube 5 is excited to vibrate by the loudspeaker 16.
  • the strength of the vibrations of the air column in the measuring tube 5 is measured by the microphone 9.
  • the resonance frequency is particularly dependent on the height of the air column in the measuring tube 5.
  • the entire range of possible resonance frequencies of the measuring tube 5 is therefore run through for different fill levels.
  • the amplitude measured on the microphone 9 increases by two to six times.
  • the resonance frequency and thus the fill level of the measuring tube 5 are therefore precisely determined by the wobble, since even if other influences influence the strength of the sound vibrations in the measuring tube 5, the passage through the resonance range can be determined by the noticeable increase in the vibration amplitude.
  • the described wobble process is preferably carried out whenever the current fill level is to be determined.
  • a trigger signal is generated in order to trigger such an individual wobble process.
  • longer periods can be provided in which a plurality of weaving operations are carried out. In this way, the current level can always be determined during these periods. This is provided in particular in the cases in which specifiable fill levels represent a particular risk (eg emptying a tank) or in which an operator wishes permanent, always up-to-date fill level information for other reasons.
  • FIG. 3 shows a further embodiment of a system 12 according to the invention in a fuel tank 2 schematically in section.
  • the same components for the exemplary embodiment in FIG. 1 are designated with the same reference numerals.
  • the measuring tube 5 with its inlet opening 8 is inserted at the lower end via the opening 4.
  • an acoustic source in particular a loudspeaker 18 as a vibration generator 10 and an acoustic sink, in particular a microphone 17 as a vibration sensor 11.
  • the loudspeaker 18 generates vibrations in all possible resonance frequencies of the air column in the measuring tube 5, corresponding to the possible liquid level 3 in the fuel tank 2 or measuring tube 5.
  • the air column then vibrates in the resonance frequency that is received on the microphone 17.
  • the resonance frequencies depend on several parameters, which in addition to the air column include the geometry of the tank 2, the measuring tube or measuring tube and other components, and the liquid.
  • the degree of filling can thus be determined directly from the resonance frequency or pitch. If the resonance frequency or pitch is displayed immediately, the fill level or height of the liquid level 3 can be represented by appropriate scale labeling.
  • a low liquid level 3 corresponds to a low tone and thus an almost empty fuel tank 2
  • a high liquid level 3 corresponds to a high tone and thus a filled fuel tank 2.
  • FIG. 4 shows a third embodiment of a fill level sensor according to the invention in a fuel tank 2 schematically in section.
  • the same components for the exemplary embodiment in FIG. 1 are designated with the same reference numerals.
  • a vibration generator 12 and vibration sensor 13 are mounted directly on the fuel tank 2 from the outside on the wall and together form the fill level sensor 15.
  • the fuel tank 2 filled up to the liquid level 3 has a resonance frequency of the entire fuel tank 2 which is dependent on the height of the fuel level 3.
  • the vibration generator 13 and the vibration sensor 14 are arranged on the wall of the liquid container.
  • the resonance frequency is determined in a simple manner by wobbling the excitation frequency of the vibration generator 13 and detecting the vibrations of the fuel tank 2, the resonance frequency of the liquid container itself being determined.
  • Evaluation electronics which are not shown in the figures, determine the degree of filling of the fuel tank 2 from the resonance frequency.
  • the measuring tube 5 or a measuring hose are separated from an electronics part (with a vibration generator, vibration sensor, evaluation electronics) in a liquid-tight manner.
  • a separating medium in particular a membrane, and optionally a pressure compensation element is preferably provided in the measuring tube 5 or in the measuring tube on the side facing the electronic part and / or in the electronic part.
  • the separation medium is used to measure the measuring medium, i.e. keep the liquid, the fill level, away from the electronic part in order to avoid damaging effects.
  • the pressure compensation medium serves to withstand static or dynamic pressure stresses which are stored in the liquid container e.g. due to filling processes, movement, temperature or other operating conditions, with regard to damaging effects on the separating medium and / or electronic part.
  • the vibration generator 6, 10 in particular for a fuel tank 2 of a motor vehicle in FIGS. 1, 2, 3 and 4, with a vibration generator 6, 10, 13 and a vibration sensor 7, 11, 14, the vibration generator 6, 10 , 13 adjustable in frequency.
  • the vibration generator 6, 10, 13 and the vibration sensor 7, 11, 14 operate in a frequency range, the body or air resonance frequencies for the possible fill levels of the liquid container of the liquid container and / or the level sensor or parts thereof.
  • a resonance frequency is generated by the vibration generator 6, 10, 12.
  • sound is received and the vibration sensor 7, 11, 14 determines the frequency at which a resonance occurs.
  • a fill level is assigned to the detected resonance frequency.
  • the liquid flows into the measuring tube 5 via the lower opening 8 to the same level as in the liquid container, the resonance frequency of at least the air column in the measuring tube 5 being determined.
  • the vibration generator 6 sweeps the frequencies.
  • the vibration generator 10 excites vibrations over the entire frequency range of possible resonance frequencies.
  • the method according to the invention can also be used with other containers for liquids. It is also applicable to containers such as e.g. Silos, for solids or gases stored under pressure, the natural resonance also being determined by the degree of filling or pressure of the container in these exemplary embodiments.
  • the invention can be used in various technical areas, for example in liquid level monitoring (fuel, coolant, windshield wiper fluid, service water, etc.) and in other areas.
  • the resonance frequency of the measuring tube 5 can also be determined in the exemplary embodiments in FIGS. 1, 2 and 3.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un système destiné à la mesure du niveau de remplissage d'un contenant rempli d'un liquide, notamment destiné au réservoir d'essence (2) d'un véhicule automobile. Ce système comprend un générateur de vibrations (6, 10, 13) et un détecteur de vibrations (11). Selon l'invention, le générateur d'oscillations (10) est réglable en fréquence. Le générateur de vibrations (10) et le détecteur de vibrations (11) fonctionnent dans une plage de fréquences comportant les fréquences de résonance du corps ou de l'air du contenant de liquide et/ou du système ou de ses parties pour les niveaux possibles du contenant de liquide.
PCT/EP2005/004066 2004-04-19 2005-04-17 Systeme et procede de mesure du niveau de remplissage d'un contenant rempli d'un liquide Ceased WO2005100928A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05735129A EP1740912A2 (fr) 2004-04-19 2005-04-17 Systeme et procede de mesure du niveau de remplissage d'un contenant rempli d'un liquide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202004006530.4 2004-04-19
DE202004006530 2004-04-19

Publications (2)

Publication Number Publication Date
WO2005100928A2 true WO2005100928A2 (fr) 2005-10-27
WO2005100928A3 WO2005100928A3 (fr) 2006-05-18

Family

ID=34965296

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/004066 Ceased WO2005100928A2 (fr) 2004-04-19 2005-04-17 Systeme et procede de mesure du niveau de remplissage d'un contenant rempli d'un liquide

Country Status (2)

Country Link
EP (1) EP1740912A2 (fr)
WO (1) WO2005100928A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009556B4 (de) * 2006-02-28 2014-02-13 Siemens Aktiengesellschaft Verfahren zur Analyse des Elektrolytsystems einer Batterie und zugehörige Einrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2509045A1 (fr) * 1981-07-03 1983-01-07 Cedepe Sa Appareil pour la mesure du niveau d'un produit en particulier d'un liquide
FR2522139A1 (fr) * 1982-02-22 1983-08-26 Thomson Brandt Procede et dispositif de mesure du volume d'un liquide dans un reservoir par resonance acoustique
GB2199948B (en) * 1987-01-16 1990-08-15 Emco Wheaton Uk Limited Measurement of liquid levels
US5184512A (en) * 1989-01-16 1993-02-09 Hrdlicka Armin W Measuring the length of a column of fluid in a tube
US5074148A (en) * 1990-01-05 1991-12-24 Lew Hyok S Resonance frequency liquid level sensor
DE10203461A1 (de) * 2002-01-28 2003-08-14 Grieshaber Vega Kg Schwingungsgrenzstandsensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009556B4 (de) * 2006-02-28 2014-02-13 Siemens Aktiengesellschaft Verfahren zur Analyse des Elektrolytsystems einer Batterie und zugehörige Einrichtung

Also Published As

Publication number Publication date
EP1740912A2 (fr) 2007-01-10
WO2005100928A3 (fr) 2006-05-18

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