EP1864108A1 - Procede et dispositif de mesure de viscosite de fluides non newtoniens, en particulier de substances necessaires au fonctionnement d'un moteur - Google Patents

Procede et dispositif de mesure de viscosite de fluides non newtoniens, en particulier de substances necessaires au fonctionnement d'un moteur

Info

Publication number
EP1864108A1
EP1864108A1 EP06707844A EP06707844A EP1864108A1 EP 1864108 A1 EP1864108 A1 EP 1864108A1 EP 06707844 A EP06707844 A EP 06707844A EP 06707844 A EP06707844 A EP 06707844A EP 1864108 A1 EP1864108 A1 EP 1864108A1
Authority
EP
European Patent Office
Prior art keywords
viscosity
sensor
measurement
excitation
viscosity measurement
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Withdrawn
Application number
EP06707844A
Other languages
German (de)
English (en)
Inventor
Monika Scherer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1864108A1 publication Critical patent/EP1864108A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
    • G01N11/16—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring damping effect upon oscillatory body
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N2011/0026—Investigating specific flow properties of non-Newtonian fluids

Definitions

  • the present invention relates to a method and apparatus for measuring the viscosity of non-Newtonian fluids, especially engine fuels.
  • piezoelectric thickness vibrators which are made of quartz used. See, for example, S. J. Martin et. al., Sens. Act. A 44 (1994) pages 209-218. If such a thickness oscillator is immersed in a viscous liquid, the resonance frequency of the natural vibration and its damping change depending on the viscosity and the density of the viscous liquid. Since the density for typical non-Newtonian fluids varies much less than the viscosity, such a component is practically a viscosity sensor.
  • DE 101 12 433 A1 discloses a viscosity sensor arrangement with a piezoelectric sensor device based on the principle of a piezoelectric thickness vibrator, which is located completely in the liquid to be measured and has electrical contact points for an electric drive, which are resistant to the liquid and with electrical supply lines , which are resistant to the liquid and which are connected on the one hand with a control / Ausnceelektronik outside the liquid and on the other hand with the contact points of the sensor device by means of a suitable metal particles provided with conductive adhesive.
  • a suitable metal particles provided with conductive adhesive.
  • An insensitive group of viscosity sensors is known from DE 198 50 799 A1. These are so-called surface oscillators or shear oscillators, in which protection against corrosive or aggressive non-Newtonian fluids is usually sought by passivation of the substrate.
  • FIG. 5 shows a schematic illustration of two exemplary kinematic measuring principles for determining the viscosity of a non-Newtonian fluid.
  • reference character Z1 denotes an outer hollow cylinder filled with a non-Newtonian fluid F.
  • Immersed in the hollow cylinder Zl is a solid cylinder Z2, which is movable over an axis A.
  • the measuring principle a) provides a constant velocity rotation about the axis A.
  • the measuring principle b) provides an oscillation with a constant frequency about the axis A.
  • Fig. 6a, b show the dependence of the viscosity ⁇ in the measurement principle a) of the shear rate ⁇ and the dependence of the viscosity ⁇ in the measuring principle b) of the frequency ⁇ .
  • FIG. 6 a shows that the value of the viscosity ⁇ decreases with increasing shear rate ⁇ in the measurement principle a).
  • the shear rate ⁇ is proportional to the angular velocity of the rotation.
  • the measurement principle b) in the measurement principle b) the real part R of the imaginary viscosity ⁇ decreases with increasing frequency of the oscillation, whereas the imaginary part I increases. In addition to the dependence on the frequency ⁇ , the measurement principle b) also depends on the amplitude of the oscillation.
  • the inventive method for measuring the viscosity of non-Newtonian fluids, in particular engine operating materials, according to claim 1 and the corresponding device according to claim 8 or 9 have over known approaches the advantage that different viscosity-determining factors can be distinguished in the liquid.
  • the present invention is based on the idea that non-Newtonian fluids, in particular engine operating parameters, such.
  • engine oil extremely important complementary information can be obtained by performing several viscosity measurements with different excitation parameters.
  • Viscosity measuring method valuable additional evidence of the state of a non-Newtonian liquid, which has various factors influencing the viscosity, e.g. a heterogeneous liquid.
  • the viscosity sensor and / or at least one excitation parameter is changed for different excitation.
  • the first and second viscosity measurements are repeated at predetermined times, wherein a time characteristic of the measurement result of the first and second viscosity measurements is stored.
  • the first and the second viscosity measurement are carried out in an engine oil which has a base oil and a macromolecular additive, wherein the first viscosity measurement provides information about the base oil and the second viscosity measurement provides information about the macromolecular additive.
  • the viscosity sensor for the first and the second viscosity measurement is a vibration sensor type, wherein the excitation differs in the sensor dimensioning and / or in the excitation oscillation form and / or in the excitation amplitude and / or in the excitation frequency.
  • the viscosity sensor for the first and the second viscosity measurement is a constant-motion sensor type, the excitation differing in the sensor dimensioning and / or in the shear rate.
  • FIG. 1 shows a first embodiment of the viscosity sensor arrangement according to the invention
  • FIG. 2 shows viscosity data of a heterogeneous engine oil obtained with the first embodiment of the viscosity sensor arrangement according to the invention
  • Fig. 5 is a schematic representation of two exemplary kinematic measuring principles for
  • Fig. 1 shows a first embodiment of the viscosity sensor arrangement according to the invention.
  • reference numeral 10 denotes an oil pan of a motor vehicle.
  • a base oil 15 with a high molecular weight additive 15a.
  • Immersed in the engine oil 15, 15a are a first and a second viscosity sensor Sl, S2.
  • the first viscosity sensor S1 is a microacoustic thickness oscillator, as known, for example, from DE 101 12 433 A1.
  • the second viscosity sensor S2 is a tuning fork vibrator.
  • the first viscosity sensor 1 operates at a frequency of 1 MHz and an amplitude of 1 ⁇ m
  • the second viscosity sensor S2 operates at a frequency of 1 kHz and an amplitude of 100 ⁇ m.
  • a control unit SE controls the operation of the two viscosity sensors Sl, S2 via lines 11, 12.
  • values for detecting the oxidation of the engine oil 15, 15a are stored and stored in a memory device SP.
  • the diamonds denote the measured values of the viscosity sensor S1
  • the squares denote the measured values of the viscosity sensor S2.
  • the viscosity sensor S1 detects the oxidation of the base oil 15 here, which is why a continuous increase of the measurement signal can be observed with increasing oxidation time.
  • the measurement signal of the viscosity sensor S2 initially decreases with increasing oxidation time, before it subsequently rises approximately with the same slope as the measurement signal of the viscosity sensor S1.
  • the initial drop in the measurement signal of the viscosity sensor S2 is due to the fact that the oxidation, the additive macromolecules are destroyed or dismembered and thus the viscosity first decreases with aging, before it rises.
  • this behavior of the macromolecules can only be detected by the low-frequency viscosity sensor S2, which also has a large amplitude. Namely, the macromolecules can not follow the high-frequency vibrations of the viscosity sensor Sl with little deflection and therefore remain invisible to the latter.
  • FIG. 3 shows a second embodiment of the viscosity sensor arrangement according to the invention.
  • a single viscosity sensor S3 in the engine oil 15, 15a is provided, which is activated via a single line 13 from the control unit SE at predetermined oxidation times.
  • the viscosity sensor S3 is a microacoustic shear oscillator according to DE 198 50 799 A1, which is excited on the one hand with its fundamental frequency and on the other hand with a harmonic, here the tenth harmonic harmonic.
  • the viscosity sensor S3 supplies complementary information at the measuring points, namely information about the viscosity at the fundamental frequency and information about the viscosity at ten times the fundamental frequency.
  • the measured values at the fundamental frequency ⁇ are indicated by the diamonds and the measured values at the frequency lO ⁇ through the squares.
  • a comparison with the first exemplary embodiment according to FIG. 2 reveals that the measured values almost coincide and, in turn, it is possible to obtain information about the base oil in the high-frequency excitation lO ⁇ and about the macromolecular additive at the fundamental frequency ⁇ .
  • the frequency ⁇ here is 10 kHz, whereas the frequency of the tenth harmonic is 100 kHz.
  • the amplitude at both excitations, i. ⁇ and lO ⁇ the same.
  • the viscosity sensors were a micromechanical thickness vibrator, shaker or tuning fork vibrator, the present invention
  • any of the microacoustic thickness transducers, shear vibrators and macroscopic vibrators may be used in the invention.
  • specified frequency or amplitude values are only examples and have to be optimized with respect to the particular non-Newtonian fluid to be investigated in order to achieve the desired

Landscapes

  • Physics & Mathematics (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)
  • Lubricants (AREA)
  • Testing Of Engines (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de mesure de viscosité de fluides non newtoniens, en particulier de substances nécessaires au fonctionnement d'un moteur, une première et une seconde mesure de viscosité étant effectuées au moyen d'un dispositif capteur de viscosité (S1, S2 ; S3) et une excitation différente du fluide non newtonien étant effectuée pour les première et seconde mesures de viscosité.
EP06707844A 2005-03-18 2006-01-26 Procede et dispositif de mesure de viscosite de fluides non newtoniens, en particulier de substances necessaires au fonctionnement d'un moteur Withdrawn EP1864108A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005012453A DE102005012453A1 (de) 2005-03-18 2005-03-18 Verfahren und Vorrichtung zur Viskositätsmessung von nicht-Newtonschen Flüssigkeiten, insbesondere Motorbetriebsstoffen
PCT/EP2006/050451 WO2006097382A1 (fr) 2005-03-18 2006-01-26 Procede et dispositif de mesure de viscosite de fluides non newtoniens, en particulier de substances necessaires au fonctionnement d'un moteur

Publications (1)

Publication Number Publication Date
EP1864108A1 true EP1864108A1 (fr) 2007-12-12

Family

ID=35966014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06707844A Withdrawn EP1864108A1 (fr) 2005-03-18 2006-01-26 Procede et dispositif de mesure de viscosite de fluides non newtoniens, en particulier de substances necessaires au fonctionnement d'un moteur

Country Status (5)

Country Link
US (1) US20090064766A1 (fr)
EP (1) EP1864108A1 (fr)
JP (1) JP2008533477A (fr)
DE (1) DE102005012453A1 (fr)
WO (1) WO2006097382A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007034585A1 (de) 2007-07-25 2009-01-29 Continental Automotive Gmbh Anordnung zum Bestimmen einer Kenngröße eines Fluids, Sensorvorrichtung und Verwendung in einem Kraftfahrzeug
DE102007040563B4 (de) * 2007-08-28 2014-05-28 Continental Automotive Gmbh Rotationsviskosimeter
KR100950274B1 (ko) 2008-03-05 2010-03-31 한양대학교 산학협력단 뉴턴／비뉴턴 유체의 유변학적 특성 측정을 위한 진동형계측시스템 및 그 방법
JP6016934B2 (ja) * 2013-02-28 2016-10-26 株式会社エー・アンド・デイ 流動体のずり速度を求める方法、そのプログラム及び装置
DE102017116515A1 (de) 2017-07-21 2019-01-24 Endress + Hauser Flowtec Ag Vorrichtung zur Messung von Viskositäten
JP7003848B2 (ja) * 2018-06-14 2022-01-21 住友金属鉱山株式会社 スラリーを輸送するポンプの選定方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903732A (en) * 1974-06-17 1975-09-09 Honeywell Inc Viscosimeter and densitometer apparatus
GB2259368A (en) * 1991-09-06 1993-03-10 British Petroleum Co Plc Measurement of viscosity
US5741961A (en) * 1993-08-18 1998-04-21 Sandia Corporation Quartz resonator fluid density and viscosity monitor
WO1998019156A1 (fr) * 1996-10-26 1998-05-07 Volkswagen Aktiengesellschaft Detecteur de qualite d'huile
US6494079B1 (en) * 2001-03-07 2002-12-17 Symyx Technologies, Inc. Method and apparatus for characterizing materials by using a mechanical resonator
US6260408B1 (en) * 1998-05-13 2001-07-17 The United States Of America As Represented By The Secretary Of The Army Techniques for sensing the properties of fluids with a resonator assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006097382A1 *

Also Published As

Publication number Publication date
US20090064766A1 (en) 2009-03-12
JP2008533477A (ja) 2008-08-21
WO2006097382A1 (fr) 2006-09-21
DE102005012453A1 (de) 2006-09-21

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