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WO2008012317A1 - Capteur acoustique de fluide avec mode nettoyage - Google Patents

Capteur acoustique de fluide avec mode nettoyage Download PDF

Info

Publication number
WO2008012317A1
WO2008012317A1 PCT/EP2007/057643 EP2007057643W WO2008012317A1 WO 2008012317 A1 WO2008012317 A1 WO 2008012317A1 EP 2007057643 W EP2007057643 W EP 2007057643W WO 2008012317 A1 WO2008012317 A1 WO 2008012317A1
Authority
WO
WIPO (PCT)
Prior art keywords
vibration
fluid sensor
cleaning
sensor according
control circuit
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/EP2007/057643
Other languages
German (de)
English (en)
Inventor
Peter Biber
Markus Gilch
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
Siemens VDO Automotive AG
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 Continental Automotive GmbH, Siemens VDO Automotive AG filed Critical Continental Automotive GmbH
Publication of WO2008012317A1 publication Critical patent/WO2008012317A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G01N29/022—Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
    • 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
    • G01N29/032—Analysing fluids by measuring attenuation 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
    • G01N29/02—Analysing fluids
    • G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
    • 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
    • G01N2291/022—Liquids
    • G01N2291/0226—Oils, e.g. engine 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
    • G01N2291/10—Number of transducers
    • G01N2291/101—Number of transducers one transducer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids

Definitions

  • the invention relates to a fluid sensor for determining the characteristic properties of a fluid having a vibratory element which can be introduced into the fluid and which can be set into vibration by means of a control circuit.
  • Such a fluid sensor is known from JP 59-126 931 A.
  • the known fluid sensor is a viscosity sensor with which, among other things, the viscosity of engine oil can be determined.
  • a holder of the known fluid sensor can be introduced into the wall of an oil sump of an internal combustion engine.
  • a control circuit which generates a generally sinusoidal actuator signal, which is applied to a piezoelectric actuator layer of the bending oscillator.
  • the actuator ⁇ signal of the bending oscillator is set in vibration.
  • a sensor voltage generated in a piezoelectric sensor layer of the bending oscillator is generally smaller than the actuator voltage. From the ratio of the voltage amplitudes, a viscosity equivalent and thus the composition of the engine oil can be determined.
  • a disadvantage of the known fluid sensor is that impurities contained in the engine oil can deposit on the bending oscillator over time. Such deposits change the vibration characteristics of the bending vibrator. It can Infol gepository ⁇ measurement errors.
  • the invention is therefore an object of the invention to provide a fluid sensor whose function remains unaffected by possible deposits on the vibration element. This object is achieved by a fluid sensor having the features of the independent claim.
  • advantageous embodiments and developments are given.
  • the fluid sensor, the vibration element of the STEU ⁇ erscquaint in a vibration mode is operative counteracting the formation of deposits on the vibration member.
  • the formation of deposits on the vibration element effectively prevented or deposits formed over time can be removed later.
  • the function of the vibration element is not affected by deposits even in the long term.
  • the vibration mode of the vibration element is switchable by the control circuit between a measuring operation and a cleaning operation in which the control unit operates the vibration element in a vibration mode conducive to debris cleaning. This makes it possible to optimize the vibration parameters in each case to the measuring operation and the cleaning operation.
  • the space provided for the measuring operation mode of vibration is a vibration mode ⁇ low vibrational energy and provided for the cleaning ⁇ supply operation mode of vibration a Schwingungsmo ⁇ dus high vibrational energy. This makes it possible to Erzie ⁇ len those accelerations on the vibrating element, which are necessary to ablate or detach deposits on the vibration ⁇ element.
  • control unit may increase the frequency or the amplitude.
  • control unit sets the Values for the frequency and the amplitude to predetermined values intended for the cleaning operation.
  • the cleaning operation is preferably carried out in a non-measuring time, in which the fluid sensor is not for the
  • Measuring operation is needed. By taking place in limited Zeitab ⁇ cut cleanings of the vibration element of the measurement operation is not disturbed. Since the formation of deposits on the vibration element takes place only slowly, are usually taking place in limited periods
  • the fluid to be measured is a liquid.
  • the vibration element can then be operated in a cavitation-inducing vibration mode. In this way, deposits on the vibration element can be removed particularly effectively.
  • the vibrating element is preferably a so-called flexural vibrator, which is constructed in multiple layers with at least one actuator layer and at least one sensor ⁇ layer.
  • Such fluid sensors can be operated in different vibration modes with different vibration energy.
  • Figure 1 shows a cross section through an introduced into the wall of an oil pan viscosity sensor
  • FIG. 2 shows the block diagram of a sensor circuit for operating the viscosity sensor from FIG. 1.
  • FIG. 1 shows a viscosity sensor 1 which is suitable inter alia for determining the viscosity and the density of engine oil 2.
  • the viscosity sensor 1 has a flexural vibrator 3 having a piezo-electric actuator layer 4 and a piezoelectric ⁇ specific sensor layer 5 in its simplest embodiment. Between the actuator layer 4 and the sensor layer 5 is a common mass ⁇ electrode 6. On the opposite side of the actuator layer 4, an actuator electrode 7 is formed. Accordingly is located externally on the sensor layer 5 is a Sen ⁇ sorelektrode 8.
  • the ground electrode 6, the actuator electrode 7 and the sensor electrode 8 are respectively connected to contact pins 9, 10 and 11.
  • FIG. 1 shows a viscosity sensor 1 which is suitable inter alia for determining the viscosity and the density of engine oil 2.
  • the viscosity sensor 1 has a flexural vibrator 3 having a piezo-electric
  • a contact end 12 of the bending oscillator 3 is enclosed by a hard casting 13.
  • the hard encapsulation 13 is seated in a housing wall 14, which is example ⁇ as can be, the wall of an oil pan.
  • the Hartverguss 13 but can also sit in a socket that is oil-tight in an opening of the housing wall 14 can be used.
  • the actuator layer 4 bezüg ⁇ Lich the longitudinal axis of the bending oscillator 3 alternately to a contraction and expansion can be caused.
  • the flexural vibrator 3 bends in a direction 15, while the flexural vibrator 3 moves in an opposite direction 16 when the actuator layer 4 expands. Since ⁇ by creates a vibration movement of the bending vibrator 3 extending within an oscillation contour 17th
  • the operating frequency of the bending vibrator 3 is arwei ⁇ se in the range of 9 to 18 kHz.
  • a sensor signal is generated by the sensor layer 5, which can be tapped on the contact pins 11 and 10.
  • the amplitude of the sensor signal is generally smaller than the amplitude of the actuator signal and can be used to determine the viscosity of the Engine oil 2 are used.
  • a viscosity equivalent can be determined from the ratio of the amplitudes.
  • the viscosity sensor 1 can also be used to determine the density of the engine oil 2.
  • the oscillation frequency of the bending oscillator 3 is tuned and the resonance maximum is sought.
  • the position of the resonance maximum is characteristic of the density of the engine oil 2.
  • the engine oil contains 2 contaminants, which accumulate with time among other things on the bending vibrator 3. This gradually increases the oscillating mass.
  • the effective elasticity of the bending oscillator 3 can be changed. Both can lead to errone ⁇ measurements in determining the viscosity or the density of the engine oil 2 comes.
  • the deposits on the bending vibrator 3 may be paint-like layers, which are formed for example by dilution of the engine oil 2 with biodiesel. But even solid particles, such as soot particles contained in engine oil 2, can accumulate over time on the bending vibrator 3. In general, the components of the mud-like deposits in the oil pans can also attach to the bending vibrator 3. This is done despite the good in itself cleaning effect of the engine oil 2. Support will be the training of Ablagerun ⁇ gen at the bending transducers 3 by long downtimes.
  • Purification of the flexural resonator 3 preferably takes place in that the typical for the measurement operation is Frequency Ranges ⁇ rich leave 9-18 kHz and switched to higher oscillation frequencies ⁇ .
  • the cleaning operation can be carried out in various ways.
  • Measurement breaks or standstill phases of the motor can be operated as a pure actuator.
  • a suitable cleaning signal is applied to the actuator layer 4.
  • the cleaning signal may have an amplitude or frequency which is above the amplitude or frequency of the actuator signal used for the measuring operation.
  • the cleaning signal may have a constant amplitude and Fre acid sequence during the cleaning process.
  • the oscillation parameters, namely the amplitude and the frequency of the oscillation of the bending oscillator 3 can also be tuned in order to eliminate local particle accumulations in a targeted manner.
  • FIG. 2 shows a block diagram of a sensor circuit 19 for the viscosity sensor 1 from FIG. 1.
  • the sensor circuit 19 comprises a microprocessor 20 which reads out operating parameters required for operation of the viscosity sensor 1 from a data memory 21.
  • the microprocessor 20 can, for example, read out operating parameters provided for the measuring operation or the cleaning operation from the data memory 21 and act on a signal generator 22 with corresponding control signals.
  • the signal generator 22 then generates the actuator signal which is applied to the contact pins 9 and 10 of the
  • Bending oscillator 3 is applied. Furthermore, a signal converter 23 is provided with which, for example, the amplitude of the sensor signal supplied by the sensor layer 5 and tapped off at the contact pins 10 and 11 can be determined. The signal generator 22 and the signal converter 23 each act on a comparator 24, which sets the amplitudes of the actuator signal and the sensor signal in proportion and passes a viscosity equivalent to the microprocessor 20.
  • the sensor circuit 19 shown in FIG. 2 can be supplemented by further sensors for monitoring the oscillation frequency of the bending oscillator 3 or the temperature and the permittivity of the engine oil 2.
  • the sensors for measuring the temperature or the permittivity can also be formed on the bending oscillator 3.
  • the microprocessor 20 ensures that will Runaway ⁇ into measuring pauses or stoppage phases of the motor of the cleaning operation.
  • the microprocessor 20 may be a part of the engine control or be in communication with the engine control.
  • the viscosity sensor 1 described here has a number of advantages.
  • the cleaning operation can effectively suppress contamination-related aging effects.
  • sediment or particles adhering to the bending vibrator 3 can be conveyed away from the bending velocity using the fluid. ger 3 are solved.
  • the cleaning ⁇ supply operation may optionally also be used for self-diagnosis of the viscosity sensor. 1 For example, a breakage of the bending oscillator 3 or a clamping error of the bending oscillator 3 can also be detected in the cleaning operation.
  • the flexural vibrator 3 oscillates permanently in a vibration mode which prevents the formation of deposits on the flexural vibrator 3 from the outset.
  • This can be achieved, for example, by selecting the dimensions of the bending oscillator 3, in particular its length and width, as well as the material composition of the bending oscillator 3 so that the frequency and the amplitude of the oscillation state used for the measuring operation are sufficiently large for the addition of particles to prevent the bending oscillator 3 from the outset.
  • fluid sensors described here can be used to measure the characteristic properties of any liquids and gases.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measuring Volume Flow (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

L'invention concerne un capteur de fluide (1) comprenant un résonateur de flexions (3). Pour nettoyer le capteur de fluide (1), on fait fonctionner le résonateur de flexions (3) dans des modes vibrations qui luttent contre la formation de dépôts à la surface du résonateur de flexions (3).
PCT/EP2007/057643 2006-07-27 2007-07-25 Capteur acoustique de fluide avec mode nettoyage Ceased WO2008012317A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610034842 DE102006034842A1 (de) 2006-07-27 2006-07-27 Fluidsensor
DE102006034842.7 2006-07-27

Publications (1)

Publication Number Publication Date
WO2008012317A1 true WO2008012317A1 (fr) 2008-01-31

Family

ID=38654657

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/057643 Ceased WO2008012317A1 (fr) 2006-07-27 2007-07-25 Capteur acoustique de fluide avec mode nettoyage

Country Status (2)

Country Link
DE (1) DE102006034842A1 (fr)
WO (1) WO2008012317A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010040583A1 (fr) * 2008-10-08 2010-04-15 Endress+Hauser Gmbh+Co.Kg Dispositif de détermination et/ou de surveillance d'une grandeur de processus d'un milieu
DE102010003734A1 (de) * 2010-04-08 2011-10-13 Endress + Hauser Gmbh + Co. Kg Verfahren zur Detektion von Gasblasen in einem flüssigen Medium
DE112011104891B4 (de) 2011-02-15 2018-01-25 National Research Council Of Canada 3D-Mikrofluid-Vorrichtungen auf der Grundlage von durchbrochenen thermoplastischen Elastomer-Membranen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850801A1 (de) * 1998-11-04 2000-05-11 Bosch Gmbh Robert Verfahren und Vorrichtung zum Betrieb einer mikroakustischen Sensoranordnung
WO2001002857A1 (fr) * 1999-04-22 2001-01-11 Akubio Limited Mesure et utilisation des interactions moleculaires
WO2001031328A1 (fr) * 1999-10-27 2001-05-03 Schlumberger Holdings Limited Systeme de detection de depot pour fond de trou de forage
WO2005106452A2 (fr) * 2004-04-01 2005-11-10 Honeywell International Inc. Capteur d'ondes acoustiques multimodal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850801A1 (de) * 1998-11-04 2000-05-11 Bosch Gmbh Robert Verfahren und Vorrichtung zum Betrieb einer mikroakustischen Sensoranordnung
WO2001002857A1 (fr) * 1999-04-22 2001-01-11 Akubio Limited Mesure et utilisation des interactions moleculaires
WO2001031328A1 (fr) * 1999-10-27 2001-05-03 Schlumberger Holdings Limited Systeme de detection de depot pour fond de trou de forage
WO2005106452A2 (fr) * 2004-04-01 2005-11-10 Honeywell International Inc. Capteur d'ondes acoustiques multimodal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010040583A1 (fr) * 2008-10-08 2010-04-15 Endress+Hauser Gmbh+Co.Kg Dispositif de détermination et/ou de surveillance d'une grandeur de processus d'un milieu
DE102010003734A1 (de) * 2010-04-08 2011-10-13 Endress + Hauser Gmbh + Co. Kg Verfahren zur Detektion von Gasblasen in einem flüssigen Medium
DE102010003734B4 (de) * 2010-04-08 2021-06-17 Endress+Hauser SE+Co. KG Verfahren zur Detektion von Gasblasen in einem flüssigen Medium
DE112011104891B4 (de) 2011-02-15 2018-01-25 National Research Council Of Canada 3D-Mikrofluid-Vorrichtungen auf der Grundlage von durchbrochenen thermoplastischen Elastomer-Membranen

Also Published As

Publication number Publication date
DE102006034842A1 (de) 2008-02-07

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