WO2007020263A1 - Procede et dispositif pour mesurer l'etat d'un liquide - Google Patents

Procede et dispositif pour mesurer l'etat d'un liquide Download PDF

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Publication number
WO2007020263A1
WO2007020263A1 PCT/EP2006/065324 EP2006065324W WO2007020263A1 WO 2007020263 A1 WO2007020263 A1 WO 2007020263A1 EP 2006065324 W EP2006065324 W EP 2006065324W WO 2007020263 A1 WO2007020263 A1 WO 2007020263A1
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WO
WIPO (PCT)
Prior art keywords
oil
sensor cluster
sensor
engine
engine oil
Prior art date
Application number
PCT/EP2006/065324
Other languages
German (de)
English (en)
Inventor
Peter Biber
Markus Gilch
Original Assignee
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 Siemens Vdo Automotive Ag filed Critical Siemens Vdo Automotive Ag
Publication of WO2007020263A1 publication Critical patent/WO2007020263A1/fr

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Classifications

    • 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
    • G01N33/2888—Lubricating oil characteristics, e.g. deterioration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0092—Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature

Definitions

  • the present invention relates to a method and apparatus for measuring a condition of a liquid.
  • a device for measuring the oil level in internal combustion engines is provided primarily in the area of an oil sump.
  • the installation of level or oil level and tempera ⁇ ture sensors at the bottom of the oil pan is currently a generally accepted standard.
  • the engine control are used in conjunction with characteristic view operating data of the vehicle for the estimation of maintenance intervals and thus specifically determining a respective oil change time point.
  • a precise knowledge of ⁇ n ⁇ alteration of viscosity and density of the engine oil allows a more accurate determination of a respective oil change timing, and thus allows independent of a software-based oil change time determination just in case of unforeseen events such.
  • As fuel dilution or excessive soot concentration in engine oil a situational reaction to critical oil state changes. Such reactions may be in a warning to the driver of a motor vehicle, but also in a detailed fault diagnosis.
  • a state sensor for liquids which monitors a respective flow behavior of the engine oil and thus its viscosity in the form of a vibrating body driven by a piezoelectric element, is known, for example, from DE 103 45 253 A1.
  • ⁇ thereof is considered that an increase in viscosity with an increase ⁇ is the density of the engine oil caused by impurities.
  • Desirable is a low viscosity of a Moto ⁇ renöls so good lubricating properties and an effective reduction of friction within the engine, he ⁇ ranges can be.
  • a bending oscillator element in contact with the engine oil is mechanically excited by at least one piezoelectric element to oscillate, wherein the at least one piezoelectric element is supplied with an amplitude-controlled electrical input signal.
  • the sensor element itself consists Wesentli ⁇ Chen from its carrier substrate having laminated thereto or integrated piezo-electrically active layers, both as actuator, as can also act as sensor layers. Sensors of the type described are also referred to as trimorphic bending vibrators. Such elements can also be produced as a ceramic multilayer. In any case, a difference between an applied electrical excitation or actuator voltage and a measured sensor output voltage as a measure of the attenuation of the bending oscillator in the fluid or
  • the resonant frequency and a jeweili ⁇ ge resonant amplitude is evaluated as a measure of the density of the fluid.
  • An increasing density of the fluid leads to a lowering of the resonance frequency.
  • a decreasing viscosity leads to an increase in the amplitude.
  • the measuring principle briefly described above can also be used with other pathogens. ren, such as magnetically excited bending vibrators are implemented.
  • a state sensor described above in an oil pan of an internal combustion engine can also be installed so that it can be used for lowering an oil level below a minimum allowable oil level by changing its characteristic behavior to output an alarm signal. It then serves as an end-range warning sensor.
  • Particles in the oil pan can cause or electrical short circuit or other negative influences th of a failure of Sensorelemen- with result by mechanical Blocka ⁇ de; Deposits form at the very lowest point of an oil sump, which can additionally influence measurement results; in the field of oil extraction by an oil pump to flow-induced vortices form in the engine oil, the resultant measurement ⁇ nit can also significantly influence.
  • a device for measuring a state of a liquid in which more than one sensor is provided, which is arranged in contact with the liquid, is accordingly characterized in that it is designed as an oil module in which a sensor cluster is arranged, the temperature and viscosity and / or density sensors and / or comprises a pressure sensor.
  • the approach for reducing an interface number leads a method according to the invention to a corresponding device while reducing possible leakage points. Since an oil module is arranged in the direction of oil flow behind an oil pump, the engine oil is also virtually bubble-free at a selected location according to the invention, so that the viscosity and density measurement can thus be performed without interference and arbitrarily often or at any desired time. Furthermore, in the region of the oil module, motor oil cooling is already effective, so that a temperature load of the sensor elements provided in a cluster arrangement according to the invention is achieved. Elements is significantly lower at this point than known from the prior art arrangements.
  • An inventive method is characterized according to the ⁇ since by that, the engine oil is pumped from a collection point and passed through an oil module in which a sensor
  • Cluster is used to measure temperature, viscosity and density of engine oil.
  • the sensor cluster is arranged in the flow direction of the engine oil behind a lubricant filter or oil filter. This ensures that the engine oil already filtered meets the sensor cluster, so that coarse soot particles and other mechanically and / or electrically disturbing solid components in the engine oil, such as abrasion, are already extracted from the engine oil. Through this Anord ⁇ planning the life of the sensor components of the sensor cluster is significantly increased.
  • the sensor cluster is arranged in a bypass branch of the oil circuit. ordered, which is also part of an oil module according to the invention.
  • the integration of a bypass branch in egg ⁇ nen oil circuit is indeed generally known in the prior art and is used for a cold start phase of an associated internal combustion engine to bypass a befindli ⁇ chen in the main stream oil filter. As a result, targeted, accelerated heating of the engine oil can be achieved. In ex ⁇ tremely low temperatures, the fluidity of the Mo ⁇ toröls decreases.
  • a modern, very close-meshed or fine lubricant filter or oil filter in the main flow is a high flow resistance, so that it can come before the oil filter to an oil pressure increase and still behind the oil filter to engine oil shortage.
  • This risk is counteracted by opening the bypass branch by the oil filter is bypassed in the main stream, in addition to a guarantee of sufficient lubricant at all lubrication points also in a cold oil phase also targeted heating of the Mo ⁇ gate oil accelerated is brought about.
  • a bypass branch is opened by a Maustromven- til, inter alia in the event that the oil filter is clogged for other reasons.
  • a sensor cluster in the bypass branch of the secondary flow path may also au ⁇ ßerquaint a cold start phase or a fault condition in the oil ⁇ circulation through the bypass valve as a control valve opened disch peri- or aperiodically be.
  • This procedure has the advantage that the bypass branch only contains engine oil of significantly lower temperature, with which the sensor cluster comes into contact.
  • lower component costs of the sub-sensors and / or longer lifetimes of the components involved can be achieved because now temperature ranges of only about 125 ° instead of the usual about 140 ° to about 160 ° C ge ⁇ usual standard specification in the design for use come.
  • a respective length of the bypass branch and a cooling effect can be influenced comparatively easily in the design stage, or also subsequently by external wiring.
  • the bypass is opened by a controllable valve only at certain oil temperatures or in certain periods or for defined measuring times.
  • a pressure sensor in addition to a temperature sensor, a viscosity and density sensor, a pressure sensor can also be accommodated in a sensor cluster.
  • the pressure sensor can be designed as a sensor or as a switch.
  • an electronic evaluation circuit which can be designed in the form of a microprocessor, is also integrated in this sensor cluster.
  • An internal processing of the measurement data of the various sensors to the outside results in the possibility of providing a definable interface of the sensor cluster for a very easy integration and adaptation to an existing engine management system.
  • a corresponding interface is connected in one embodiment of the invention by a two-wire line, a LIN bus or a similar device with very low data density to an engine management ⁇ ment.
  • a flow measurement is realized in the sensor cluster.
  • This function is very useful especially in the case of a volume-controlled oil pump operation.
  • the viscosity and / or density sensor it is possible to use the viscosity and / or density sensor.
  • the sensor is to be rated in such a way that a bend caused by the flow resistance of the sensor itself is evaluated as a measure of the mass flow.
  • a sensor cluster is preferably provided with a front and / or radial seal, which may be formed, for example, as an O-ring seal over the above ver ⁇ different embodiments.
  • an assembly via at least one latching or snap closure is provided on the oil module.
  • Figure 1 a first embodiment of a device according to the invention in the form of an oil module
  • Figure 2 a second embodiment of a device according to the invention analogous to the representation of Figure 1;
  • FIG. 3 shows a third embodiment of a device according to the invention analogous to the representation of Figures 1 and 2;
  • Figure 4 a fourth embodiment of a device according to the invention analogous to the representation of Figures 1 to 3 and
  • Figure 5 an extended sensor cluster that can be used in any of the above embodiments of the invention.
  • FIG. 1 shows a basic structure of a first embodiment of a device for implementing a method according to the invention.
  • engine oil OIL is passed through an oil module 1.
  • the oil module 1 has a main flow 2 and a bypass branch 3.
  • a lubricant filter or oil filter 4 for separating solid contaminants from the engine oil OIL.
  • the bypass branch 3 is closed by a bypass valve 5 in normal operation.
  • a cold-oil phase of the bypass branch 3 is opened by the bypass valve 5 to ensure by bridging the very fine-pored oil filter 4 lubrication and at the same time to heat the cold engine oil faster.
  • the engine oil compared to the normal Be ⁇ drive state significantly increased viscosity, so that the oil filter 4 for cold engine oil act as a strong throttle ⁇ de ⁇ .
  • the bypass branch 3 is used in this case with the bypass valve 5 as pressure equalization to ensure a sufficient amount of lubricant.
  • a branch 7 Behind a junction of the bypass branch 3 in the main ⁇ stream 2 is a branch 7, which leads to an oil pressure sensor 8 s.
  • a further cooling of the engine oil OIL is effected by a heat exchanger K.
  • a sensor cluster 12 To the output of the oil module 1 through a sensor cluster 12 is provided on the flow path of the Mo ⁇ toröls, which in the present Case is fixed in the oil module 1 via an O-ring seal 13 and not shown detent seals.
  • the sensor cluster 12 comprises a viscosity and density sensor 14 and a temperature sensor 15 in the form of an NTC resistor.
  • installation position of the sensor cluster 12 ⁇ in the oil module 1 as an essential component of an oil circuit are particularly reliable Mes ⁇ ser pertain thereby guarantees that the engine oil 0il be ⁇ already filtered and freed from coarse carbon black particles and abrasion been is, wherein the engine oil after passing through the oil pump, not shown substantially free of bubbles for a reliable viscosity and density measurement.
  • a temperature loading of the sensor elements 14, 15 of the sensor cluster 12, as in an oil pan since the engine oil at the selected point of the circuit has already been significantly cooled from ⁇ clearly were less at the selected location, for example.
  • the sensor module is designed asspositionie ⁇ - saving plug-in module, which brings an easy handling with short working times during installation and maintenance with it.
  • An arrangement of the sensor cluster 12 in the oil module 1 brings to ⁇ the advantage of a very low engine oil loss when opening the oil circuit at this point with it, since the engine ⁇ oil is only a minimum pressure when replacing the sensor cluster 12.
  • Figure 2 shows a second embodiment of a erfindungsge ⁇ MAESSEN device as a modification of the embodiment of Figure 1, wherein at otherwise constant arrangement, the sensor cluster 12 is now arranged in a circle in the oil of the oil module 1 newly added settling chamber 17th Due to the selected arrangement, the sensor cluster 12 with the sub-sensors 14, 15 contained therein no longer lies directly in the flow of engine oil. This is advantageous at least then ⁇ way, if at least one of the sub-currents sensor elements should be mung sensitive.
  • a bubble separator is arranged integrated, which takes the form of a close-meshed spongy network or sieve still separates any existing bubbles from the engine oil before the engine oil with the sub-sensors 14, 15 of the sensor cluster 12 comes into contact. This further increases the reliability of the measurement results.
  • FIG. 3 shows an embodiment of an oil module 1 according to the invention, in which the sensor cluster 12 is arranged on the bypass branch 3.
  • the bypass branch 3 is opened periodically or aperiodically by a controllable bypass valve 5.
  • Such an arrangement and a non-permanent flow through the bypass branch 3 with engine oil has the advantage that prevails in the bypass branch 3, a significantly lower temperature of the engine oil, which can also be further reduced by a length of the bypass branch 3 and separate cooling measures.
  • a respective length of the bypass branch 3 and a cooling effect can be easily influenced structurally in the design of the module 1, but also subsequently by a corresponding external wiring with heat sinks or active heat exchangers.
  • a reduced maximum temperature load reduces the component costs of the sub-sensors 14, 15 of the sensor cluster 12 and also increases the life of the sub-sensors 14, 15, since in the present embodiment now only temperature ranges up to a maximum of 125 ° C instead of temperatures from 140 ° C to about 160 ° C abut the sub-sensors.
  • bypass branch 3 is opened by the controllable bypass valve 5 only at certain engine oil temperatures or opened depending on a prevailing engine oil temperature only for certain periods of time for defined measurement times, so that an adjustable maximum temperature of the engine oil in the branch ⁇ branch 3 is not exceeded ,
  • the sensor module 12 is arranged on a additionally provided in the bypass branch 3 3 calming chamber. So the advantages mentioned above with reference to the figure of Figure 2 are also realized in this embodiment.
  • Cluster 12 in addition to a temperature sensor 15 and a viscosity and density sensor 14 and a pressure sensor 8.
  • a separate oil pressure sensor 8 with an associated branch 7, compare the figure of Figures 1 to 3, can be omitted in the embodiment according to FIG , In this way, oil cooling can be given an additional space with an otherwise unchanged design of the oil module 1.
  • FIG. 5 shows a relation to the exemplary form of Figure 4 expanded sensor cluster 12.
  • the sensor cluster 12 now has an electronic evaluation circuit in the form of a microprocessor .mu.C on, in which the interface of the len ⁇ of all partial sensors 8, 14, 15 lead to the evaluation and preprocessing of the respective measurement signals.
  • Programmable via the microcontroller .mu.C different interfaces of the sensor cluster 12 can be provided to the outside in adaptation to respective external requirements.
  • the ⁇ ser structure also allows integration of a flow ⁇ measurement in the sensor cluster 12 in that they function to support an amount just oil pump control resistance bending a part sensor by its own flow ⁇ as a measure of a flow by a known defined, Cross-sectional area evaluates.
  • IMP EXP ⁇ including possible to provide a direct connection to a data network in the form of a single sensor cluster with mono- times will seal effort and a mounting manner of a snap closure or snap closure for low-cost assembly, the reduced due to the strong Data rate can also exist in the form of a two-wire line or a LIN network.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour mesurer l'état d'un liquide. L'objectif de cette invention est de créer un procédé et un dispositif qui servent à mesurer l'état d'un liquide de manière fiable, et qui sont moins sensibles aux influences perturbatrices. A cet effet, ledit dispositif se présente sous la forme d'un module d'huile (1) dans lequel est disposé un groupe de capteurs (12) comprenant des capteurs de température et de viscosité, et/ou de densité (14, 15), et/ou un capteur de pression (8). Le procédé selon l'invention est caractérisé en ce que l'huile moteur se trouvant au niveau d'un point de collecte est pompée et guidée à travers un module d'huile (1) dans lequel un groupe de capteurs (12) est utilisé pour mesurer la température, la viscosité, la densité, et/ou la pression de l'huile moteur (OIL).
PCT/EP2006/065324 2005-08-18 2006-08-15 Procede et dispositif pour mesurer l'etat d'un liquide WO2007020263A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510039480 DE102005039480B4 (de) 2005-08-18 2005-08-18 Verfahren und Vorrichtung zur Messung eines Zustandes von Motoröl
DE102005039480.9 2005-08-18

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WO2007020263A1 true WO2007020263A1 (fr) 2007-02-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012110321A1 (de) * 2012-10-29 2014-04-30 Dr. Ing. H.C. F. Porsche Aktiengesellschaft System zum Untersuchen von Motorenöl
CN110410384A (zh) * 2019-09-01 2019-11-05 宋彦宏 一种液压管路的来油测量指示仪及检测方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3161465B1 (fr) 2014-06-30 2019-07-24 Pitco Frialator, Inc. Système et procédé de détection de qualité d'huile
US9841394B2 (en) 2015-11-16 2017-12-12 Pitco Frialator, Inc. System and method for sensing oil quality
US10436730B2 (en) 2015-12-21 2019-10-08 Pitco Frialator, Inc. System and method for sensing oil quality
DE102023106324A1 (de) 2023-03-14 2024-09-19 Innio Jenbacher Gmbh & Co Og Verfahren zur Überwachung eines Schmierstoffes eines Verbrennungsmotors

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DE19850803A1 (de) * 1998-11-04 2000-05-11 Bosch Gmbh Robert Sensoranordnung und ein Verfahren zur Ermittlung der Dichte und der Viskosität einer Flüssigkeit
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US20040255648A1 (en) * 2003-06-18 2004-12-23 Integrated Sensing Systems, Inc. Resonant tube viscosity sensing device
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Publication number Priority date Publication date Assignee Title
DE69918193T2 (de) * 1998-01-12 2005-07-21 The Lubrizol Corp., Wickliffe Vorrichtung zur Aufrechthaltung der Ölqualität und des Ölstandes in einer Brennkraftmaschine
DE19850803A1 (de) * 1998-11-04 2000-05-11 Bosch Gmbh Robert Sensoranordnung und ein Verfahren zur Ermittlung der Dichte und der Viskosität einer Flüssigkeit
US6283082B1 (en) * 1999-11-17 2001-09-04 General Electric Company Method and apparatus to extend the operating interval between oil changes for an internal combustion engine
US6561010B2 (en) * 1999-11-19 2003-05-13 Battelle Memorial Institute Apparatus and method for fluid analysis
EP1462775A1 (fr) * 2003-03-25 2004-09-29 ELTEK S.p.A. Dispositif pour détecter des variables physiques de l'huile lubrifiante d'un moteur à explosion
US20040255648A1 (en) * 2003-06-18 2004-12-23 Integrated Sensing Systems, Inc. Resonant tube viscosity sensing device
DE10345253A1 (de) * 2003-09-29 2005-05-04 Siemens Ag Zustandssensor für Flüssigkeiten

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012110321A1 (de) * 2012-10-29 2014-04-30 Dr. Ing. H.C. F. Porsche Aktiengesellschaft System zum Untersuchen von Motorenöl
CN110410384A (zh) * 2019-09-01 2019-11-05 宋彦宏 一种液压管路的来油测量指示仪及检测方法
CN110410384B (zh) * 2019-09-01 2024-03-08 宋彦宏 一种液压管路的来油测量指示仪及检测方法

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