EP3752800A1 - Vorrichtung zum bestimmen einer höhe und/oder qualität eines fluids in einem fluidbehälter - Google Patents
Vorrichtung zum bestimmen einer höhe und/oder qualität eines fluids in einem fluidbehälterInfo
- Publication number
- EP3752800A1 EP3752800A1 EP19702076.1A EP19702076A EP3752800A1 EP 3752800 A1 EP3752800 A1 EP 3752800A1 EP 19702076 A EP19702076 A EP 19702076A EP 3752800 A1 EP3752800 A1 EP 3752800A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound
- fluid
- transducers
- sound signal
- transducer module
- 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- Withdrawn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
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
- G01F23/2968—Transducers specially adapted for acoustic level indicators
-
- 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
- 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
-
- 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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2406—Electrostatic or capacitive probes, e.g. electret or cMUT-probes
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
-
- 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
- G01N2291/025—Change of phase or condition
- G01N2291/0258—Structural degradation, e.g. fatigue of composites, ageing of oils
-
- 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
- G01N2291/04—Wave modes and trajectories
- G01N2291/045—External reflections, e.g. on reflectors
Definitions
- the present invention relates to a device for Be vote a height and / or quality of a fluid such.
- a device for Be vote a height and / or quality of a fluid such.
- an acoustic measuring device For determining a height of a fluid surface in a fluid container, for example, an acoustic measuring device can be used.
- a sound transducer of the acoustic measuring device can both as a sound generator and as
- sound signals can be emitted in the direction of a reference reflector arranged in the fluid for determining a speed of sound in the fluid.
- the speed of sound can be used both for determining the fluid surface and for determining the quality of the fluid.
- DE 10 2014 210 080 A1 discloses a device for determining a height of a fluid surface in a fluid container.
- the device known therefrom comprises a first sound transducer, which is designed to emit sound signals in the direction of the fluid surface and to receive the signals reflected on the fluid idober Structure, and a second sound transducer, which is adapted to emit sound signals in the direction of a fluid arranged in the container reference element and to receive the signals reflected at the reference element. From the sound emitted by the second transducer and received again a Schallgeschwin speed can be determined within the fluid, which in turn can then be used to determine the height of the fluid surface.
- DE 10 2014 210 077 A1 discloses an apparatus and a method for determining the height of a fluid surface in a fluid container.
- US 5 744 898 A discloses a device with an ultrasonic transducer matrix which has an integrated transmitter and receiver circuit.
- the present invention is based, to provide an apparatus for determining a height and / or a quality of a fluid in a fluid container, which allows a reliable determination of the height and / or quality of the fluid and at the same time can be produced inexpensively and efficiently.
- the present invention is based on the idea of using in a device for determining the height and / or quality of a fluid in a vehicle a transducer module with a plurality of sound transducers, in which the transmission signal propagation direction is set as desired can be.
- This offers over fluid level and fluid quality sensors known from the prior art the advantage that, instead of two independent and in only one direction radiant from sound transducer only a single baffle lermodul is provided whose overlay signal can be adjusted from broader direction as desired.
- separate deflecting elements for sound diversion can be omitted.
- an apparatus for determining a height of a surface of a fluid and / or a quality of the fluid in a fluid container comprises a Schallwandlermodul comprising at least two sound transducers, each of which is formed to emit sound signals such that when superimposing the at least two sound signals, a superposition results rungsschallsignal, and arranged in the fluid reference element to the sound transducer module a pre has given distance and is adapted to reflect the fürlagerungsschallsignal.
- the sound transducer module is designed to emit the superposition sound signal both in a first direction to the surface of the fluid by superposition of the at least two sound signals and to emit in a first direction at a predetermined sound signal angle extending second direction to the reference element. Consequently, the spreading direction of the overlay sound signal can be adjusted as desired by suitably driving the sound transducer module.
- the sound transducer module is further configured to be controlled in at least two different drive modes such that in a first drive mode the overlay sound signal in the first direction to the surface of the fluid is emitted and in a second control mode, the superposition sound signal is transmitted in the second direction to the reference element.
- both the height of the surface of the fluid and the quality of the fluid can be determined even at low levels of fluid, since the beat-up sound signal can be emitted in the desired direction, namely in the first direction or in the second direction.
- the superposition sound signal can also be transmitted in any direction between the first direction and the second direction.
- the at least two different drive modes are executed offset in time.
- the different control modes differ in the control of the at least two sound transducers with regard to the amplitude, the frequency and / or the phase offset between the at least two sound signals.
- the predetermined Schallsig nalwinkel between the first direction and the second direction in a range between about 70 ° and about 110 °, preferably in a range between 80 ° and about 100 °, more preferably in one Range between about 85 ° and about 95 °, wherein the predetermined sound signal angle is most preferably about 90 °.
- the second direction is substantially parallel to the bottom portion of the fluid container, that is, in a substantially horizontal direction, so that the superimposed sound signal can be sent even at low levels to the also preferably at the bottom portion of parent reference element and reflected there.
- the at least two sound transducers may be arranged in a common plane in the form of a matrix.
- the plane is inclined relative to the surface of the fluid by a predetermined tilt angle, which is preferably in a range between about 25 ° and about 56 °, preferably in a range between about 35 ° and about 55 °, more preferably in a range between about 40 ° and about 50 °, and most preferably about 45 °.
- the at least two in a matrix of ordered sound transducers are preferably arranged such that the respective transmission points of the sound signals lie in a common plane.
- the at least two sound transducers are arranged at a predetermined distance from each other.
- At least one of the at least two sound transducers is associated with a sound guide element, which is formed from at least partially to guide the sound signals of the associated sound transducer.
- the sound guiding element is substantially funnel-shaped, in which the smaller opening faces the sound transducer.
- he inventive device further comprises a control unit which is adapted to determine a Schallgeschwin speed within the fluid depending on the reference element emitted to the reference element reflected and received again overlay control signal and depending on the emitted to the fluid surface, at the fluid surface reflected and re-received overlay sound signal and the detected sound velocity within the fluid to determine the height of the fluid surface above the bottom portion of the fluid container and / or the quality of the fluid.
- a control unit which is adapted to determine a Schallgeschwin speed within the fluid depending on the reference element emitted to the reference element reflected and received again overlay control signal and depending on the emitted to the fluid surface, at the fluid surface reflected and re-received overlay sound signal and the detected sound velocity within the fluid to determine the height of the fluid surface above the bottom portion of the fluid container and / or the quality of the fluid.
- a control unit which is adapted to determine a Schallgeschwin speed within the fluid depending on the reference element emitted to the reference element reflected and
- the at least two sound transducers are capacitive micromechanical ultrasound transducers (CMUT) or piezoelectric micromechanical ultrasound transducers (PMUT).
- Fig. 1 shows a schematic view of a device according to the invention for determining a height and / or quality of a fluid in a fluid container
- Fig. 2 is a sectional view through a transducer module of
- fluid quality describes a fluid characterizing parameter, for example, the speed of sound of the fluid, the density of the fluid from which the chemical composition of the fluid can be derived, and the electrical properties of the fluid are taken as parameters that will be the Characterize fluid quality.
- a fluid characterizing parameter for example, the speed of sound of the fluid, the density of the fluid from which the chemical composition of the fluid can be derived, and the electrical properties of the fluid are taken as parameters that will be the Characterize fluid quality.
- FIG. 1 shows a fluid container 1 with a bottom section 3 and a fluid chamber 5, which is filled with a fluid F.
- the fluid F is, for example, a liquid medium for pollutant reduction in exhaust gases, which preferably has a reducing agent and / or a reducing agent precursor, for example an aqueous urea solution.
- the fluid F may be an oil, such as a transmission fluid for a transmission of a vehicle.
- a sound converter module 10 is arranged on the bottom portion 3 of the fluid container 1.
- the sound transducer module 10 is disposed relative to the fluid surface 0 at a predetermined tilt angle a.
- the bottom portion have a ent speaking recess 4, in which the transducer module 10 is attached from the outside to the fluid container 1.
- Sound transducer module 10 is connected to a control unit 2, which is designed to control the sound transducer module 10 and to evaluate the signals received by the sound transducer module for determining the height H of the fluid surface 0 and / or the quality of the fluid F.
- the height H of the fluid surface 0 is defined as a distance of the fluid surface 0 of the bottom portion 3, measured in a neutral position of the fluid container 1, so if there is no inclination of the fluid container 1 and the fluid surface 0 substantially parallel to the bottom portion. 3 is.
- the height H of the fluid surface 0 can also be referred to as a filling level of the fluid container with fluid F.
- the transducer module 10 is coupled for example by a Ge housing wall of the fluid container 1.
- the housing wall is formed of a plastic, such as so-called high-density polyethylene (HDPE), so that the bottom portion 3 can be welded in the housing wall.
- HDPE high-density polyethylene
- the transducer module 10 is glued to the housing or mechanically pressed to this, possibly even with a further intermediate layer, chen to bumps or rugosities chenlei.
- the sound converter module 10 comprises at least two sound transducers 20 to 90 (see FIG. 2), each of which is designed to transmit and receive sound signals.
- the baffle lermodul 10 may be formed by different control to emit a superposition sound signal, which results from superimposition of the sound signals of the at least two sound transducers 20 to 90 (see FIG. 2), and to receive again.
- the transducer sound module 10 emitted from superposition sound signals with arrows 12, 14, whereas the sound transducer module 10 again received overlay sound signals are indicated by arrows 11, 13.
- a reference element 8 is further provided, which is preferably formed of a material having a metal.
- the reference element 8 reflects at least a portion of the overlay sound signal 14 and has to the sound transducer module 10 a predetermined and constant distance. As shown in FIG. 1, it may be preferable that the Reference element 8 within the fluid container 1 with the Bo denabites 3 is mechanically coupled.
- Determining the height H of the fluid surface 0 and / or the quality of the fluid takes place, as described in detail in the prior art, by evaluation of the fluid surface 0 emitted, reflected on the fluid surface 0 and again received overlay sound signal 12 and by evaluation of the reference element 8 emitted, reflected on the reference zelement 8 and again received overlay tion sound signal 14, based on the speed Schallge in the fluid F can be determined.
- the present invention is, as already mentioned above, based at least in part on the idea that the transducer module 10 consists of at least two sound transducers 20 to 90, each of which sends out individual sound signals that extend in a substantially parallel and at least partially so overlay that results in a superposition sound signal, the propagation direction can be adjusted by suitable driving the at least two sound transducers 20 to 90 as desired.
- Fig. 2 shows a section through the exemplary
- the transducer module 10 may consist of a plurality of sound transducers 20 to 90, wherein in the direction in the plane of the drawing and out of the drawing plane further transducers may be arranged out.
- the baffle lermodul 10 has a matrix-like arrangement of a plurality of sound transducers, which may be the same in each case.
- any other arrangement forms of the plurality of transducers are conceivable, for example a circular arrangement or an unsorted arrangement.
- the sound transducers 20 to 90 are arranged in a common plane E (in Fig. 2 with a dashed line represents is).
- the individual transmission points of the plurality of transducers 20 to 90 are in the common plane E.
- the individual transmission points can not be arranged in a common plane, so that with simultaneous and identical control of the plurality of transducers 20 to 90 already a superposition sound signal 18 (see Fig. 2) is generated, which is not parallel to the arrow 16.
- the sound transducers 20 to 90 each have a predetermined distance a.
- the terme agreed distance a between two adjacent transducers 20 to 90 is preferably about an odd integer (n) multiple of half the wavelength l of the sound transducers emitted sound signals, d. H. a (2 n-1 l
- the predetermined distance a is measured here from the fictitious transmission point of a sound transducer to the fictitious transmission point of an adjacent sound transducer.
- Each sound transducer 20 to 90 of FIG. 2 is substantially identical in construction and is preferably provided in the form of a capacitive micromechanical sound transducer (CMUT) or piezoelectric micromechanical sound transducer (PMUT).
- CMUT capacitive micromechanical sound transducer
- PMUT piezoelectric micromechanical sound transducer
- Each transducer 20 to 90 emits a sound signal, which extends substantially perpendicular to the Anord voltage level (shown in Fig. 2 by the arrow 16 by way of example). Further, it is preferable that each sound transducer 20 to 50 emits similar sound signals in terms of frequency and amplitude.
- the activation of the Sound transducer 20 to 90 takes place separately, wherein the phase offset of the plurality of sound signals can be adjusted by a temporally offset driving the sound transducer 20 to 90, whereby the direction of the overlay sound signal 12, 14 can be adjusted.
- the sound transducers may be formed differently from 20 to 90 and emit their sound signal in each case in different directions.
- the plurality of sound transducers 20 to 90 are adapted to emit such a sound signal in each case that the plurality of sound signals at least partially overlap to generate the overlay sound signal 18 (see FIG. 2).
- each of the plurality of transducers 20 to 90 a sound guide element is assigned, which is respectively adapted to the respective sound signal of the associated sound transducer 20 to 90 at least partially respectively.
- the respective sound guide element may be formed funnel-shaped, wherein the smaller opening is assigned to each respective transducer 20 to 90.
- the sound guide member 19 is cylindrical or has any other suitable shape.
- the control unit 2 of the device according to the invention is designed to control the plurality of sound transducers so that when superimposing the plurality of individual sound signals of the sound transducer 20 to 90, a superposition sound signal is generated which extends in a predetermined and desired direction.
- the arrow 18 shows, by way of example, the profile of the superposition sound signal, which is opposite to the sound signal a single transducer 20 to 90 under aroz certain angle ß runs.
- control unit 2 is in particular designed to control the sound transducer module 10 in different control modes.
- the individual control of the plurality of sound transducers 20 to 90 differ with regard to the amplitude, the frequency and / or the phase offset between the at least several sound signals.
- the plurality of sound transducers can be controlled at different times with different strengths.
- the device according to the invention for determining the height H of the fluid surface O of the fluid F and / or the quality of the fluid F can be operated.
- the fluid space 5 above the fluid F is filled with another medium, such as air, so that the first emitted by the transducer module 10 to the fluid surface 0 overlay tion signal echo 12 at a transition of the fluid surface reflect 0 to the air and get back to the transducer module 10 can (see arrow 11 in FIG. 1).
- the emission of the overlay sound signal 12, 11 in the direction of the fluid surface 0 takes place in a first drive mode of the transducer module 10th
- the sound transducer module 10 are used both as transmitter and receiver.
- the propagation of the overlay sound signal 12, 11 is preferably carried out directly, so that a power loss is prevented at obstacles and so a determination of high levels of the fluid container 1 is possible.
- a signal propagation speed of the overlay sound signals 11, 12, 13, 14 must be known. For this reason, a reference measurement is performed. In order to perform this reference measurement even at low heights H of the fluid surface 0 in the fluid container 1, so for example at levels below 10% of a maximum level, there is a second control mode of
- Sound transducer module 10 such that the superposition sound signal 14 near the bottom portion 3 of the fluid container 1 is emitted substantially parallel to the bottom portion 3 in the direction of the reference element 8.
- the superimposed sound signal 13 reflected at the reference element 8 is then received again by the sound transducer module.
- the reference element 8 has a predetermined distance to the sound converter module 10.
- a transit time difference of the emitted and reflected superimposed sound signal 13, 14 is determined depending on the known distance of the reference element 8 and depending on the running time difference, a speed of sound in the fluid F in the fluid container 1 is determined.
- the height H can then be determined by evaluating the transit time of the superposition sound signal 12, 11 sent to the fluid surface 0 and received again. Additionally or alternatively, the quality of the fluid F can be determined on the basis of the speed of sound. Depending on the composition of the fluid F, different speeds of sound result.
- the angle between the overlay sound signal 12 and the overlay sound signal 14 may be up to 110 °, for example.
- the tilt angle can be approximately 0 °, ie the plane E runs essentially parallel to the bottom section 3.
- the reference zelement 8 is not arranged on the bottom portion 3, but in the fluid container 1 and the transducer module 10 by means of the transmission sound signal 14 can be illuminated.
- the transducer module 10 from the outside den Bo denabites 3 of the fluid container 1 is mounted.
- an elastic layer located between the transducer module 10 and the wall of the bottom portion 3 of the fluid container 1, an elastic layer (not shown in the drawings), which is adapted to attach the transducer module 10 to the fluid container 1 and exclude an air gap in the sound path of the sound signals. Consequently, the sound transducer module 10 is adapted to couple the overlay sound signal through the elastic layer and the wall of the bottom portion 3 of the fluid container 1 in the fluid and to receive again.
- Bragg angle which may be temperature dependent, in particular at the elastic layer.
- control unit 2 is adapted to the
- Sound transducer module 10 to control such that the Kochla- tion sound signal is coupled into the fluid such that the desired overlay sound signal direction results.
- the temperature of the fluid it may be advantageous to the temperature of the fluid, the to give a good estimate of the temperature of the elastic layer can be considered.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018202209.7A DE102018202209B3 (de) | 2018-02-13 | 2018-02-13 | Vorrichtung zum Bestimmen einer Höhe und/oder Qualität eines Fluids in einem Fluidbehälter |
PCT/EP2019/051938 WO2019158345A1 (de) | 2018-02-13 | 2019-01-28 | Vorrichtung zum bestimmen einer höhe und/oder qualität eines fluids in einem fluidbehälter |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3752800A1 true EP3752800A1 (de) | 2020-12-23 |
Family
ID=65237046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19702076.1A Withdrawn EP3752800A1 (de) | 2018-02-13 | 2019-01-28 | Vorrichtung zum bestimmen einer höhe und/oder qualität eines fluids in einem fluidbehälter |
Country Status (5)
Country | Link |
---|---|
US (1) | US11506529B2 (de) |
EP (1) | EP3752800A1 (de) |
CN (1) | CN111712692A (de) |
DE (1) | DE102018202209B3 (de) |
WO (1) | WO2019158345A1 (de) |
Families Citing this family (2)
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DE102018214297B4 (de) * | 2018-08-23 | 2020-06-18 | Continental Automotive Gmbh | Verfahren zum Betreiben einer Fluidsensorvorrichtung und Fluidsensorvorrichtung |
DE102019135600A1 (de) * | 2019-12-20 | 2021-06-24 | Endress+Hauser Conducta Gmbh+Co. Kg | Verfahren zur Schlammspiegelmessung per Ultraschall sowie Ultraschall-Schlammspiegelsensor und Ultraschall-Schlammspiegelsensorsystem |
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EP3165736A1 (de) | 2015-11-03 | 2017-05-10 | Plastic Omnium Advanced Innovation and Research | Verfahren zur überwachung der harnstoffqualität eines scr-systems |
US20170205338A1 (en) | 2016-01-18 | 2017-07-20 | Sentelligence, Inc. | Sensor system for multi-component fluids |
-
2018
- 2018-02-13 DE DE102018202209.7A patent/DE102018202209B3/de active Active
-
2019
- 2019-01-28 EP EP19702076.1A patent/EP3752800A1/de not_active Withdrawn
- 2019-01-28 WO PCT/EP2019/051938 patent/WO2019158345A1/de unknown
- 2019-01-28 US US16/969,494 patent/US11506529B2/en active Active
- 2019-01-28 CN CN201980013195.4A patent/CN111712692A/zh active Pending
Also Published As
Publication number | Publication date |
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DE102018202209B3 (de) | 2019-05-29 |
US20200400481A1 (en) | 2020-12-24 |
US11506529B2 (en) | 2022-11-22 |
WO2019158345A1 (de) | 2019-08-22 |
CN111712692A (zh) | 2020-09-25 |
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