EP1405052A1 - Device for evaluating the signal of a viscosity sensor - Google Patents

Device for evaluating the signal of a viscosity sensor

Info

Publication number
EP1405052A1
EP1405052A1 EP02740343A EP02740343A EP1405052A1 EP 1405052 A1 EP1405052 A1 EP 1405052A1 EP 02740343 A EP02740343 A EP 02740343A EP 02740343 A EP02740343 A EP 02740343A EP 1405052 A1 EP1405052 A1 EP 1405052A1
Authority
EP
European Patent Office
Prior art keywords
signal
viscosity
sensor
temperature
viscosity sensor
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Withdrawn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
EP02740343A
Other languages
German (de)
French (fr)
Inventor
Bernhard Jakoby
Johannes Artzner
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 EP1405052A1 publication Critical patent/EP1405052A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • G01N2011/0006—Calibrating, controlling or cleaning viscometers
    • G01N2011/0013—Temperature compensation

Definitions

  • the invention is based on a device for evaluating the signal of a viscosity sensor.
  • Devices of this type are already known in which the signal from the viscosity sensor is amplified.
  • the device according to the invention for evaluating the signal of a viscosity sensor with the features of the independent patent claim has the advantage that the strong influence of temperature on the measured variable viscosity is partially compensated for.
  • the strong widening of the value range of the measurement signal due to the influence of temperature on the viscosity can thus be greatly reduced, which allows an increased resolution in the evaluation of the measurement signal.
  • Figure 1 shows an embodiment of the invention.
  • FIG. 1 shows a block diagram of the device according to the invention for evaluating the signal of a viscosity sensor.
  • a viscosity sensor is shown schematically in FIG. 1, which generates a viscosity signal of the sensor V s .
  • This signal V s is fed to an amplifier circuit 2, where the signal is amplified and then output as an output signal V.
  • the intensity of this output signal V is a measure of the viscosity of a measuring liquid.
  • a temperature sensor 3 is also provided, which generates a temperature sensor signal T.
  • the signal of the temperature sensor T is fed to a further input of the amplifier 2.
  • the amplifier 2 is designed such that the gain of the amplifier 2 is controlled as a function of the temperature signal T.
  • the temperature signal T is also given externally.
  • the device described in FIG. 1 is suitable for determining the viscosity with partial compensation of the temperature influence on the viscosity of the measuring medium.
  • the determination of the oil quality in a motor vehicle engine is considered, in which the temperature of the engine oil varies between -20 ° C. and more than + 120 ° C. during the measuring operation.
  • a viscosity sensor is therefore provided in the oil pan to determine the viscosity.
  • the measured viscosity of the engine oil can be used to assess the quality and a recommendation for an oil change can be made. This measure on the one hand avoids unnecessary oil changes or the maintenance intervals of a motor vehicle engine can be made longer.
  • a microacoustic sensor is used to measure the viscosity.
  • an oscillating element is introduced into the oil, the oscillation frequency or damping of this oscillation is a measure of the viscosity.
  • the oscillation frequency or damping are converted into an analog signal which represents the viscosity. (For the frequency, this can be done using a frequency-voltage converter, for example).
  • a sensor signal from the viscosity sensor VS is proportional to the density p or to the viscosity ⁇ according to Formula 1
  • a typical engine oil sensor for example, has a viscosity sensor characteristic as expressed by Formula 2. In connection with the temperature dependence of the viscosity of the oil, this leads approximately to a linear course of the viscosity signal of the sensor VS over the temperature according to the formula
  • the constants kl and k2 are constants that depend on the type of oil.
  • the temperature dependence of the viscosity of the oil can thus be characterized by two constants.
  • the sensor signal VS is fed into the amplifier 2 and amplified with the gain A:
  • the gain A is now provided with a temperature dependency, so that the output signal V is influenced as little as possible by the temperature over the desired temperature range and thus always represents a direct measure of the viscosity of the oil.
  • the dependency of viscosity on temperature as shown in Formula 3, there is a reinforcement in the form:

Abstract

The invention relates to a device for evaluating the signal of a viscosity sensor (1), comprising an amplifying circuit (2). The amplification (A) of the amplifying circuit (2) is controlled by a temperature signal (T) of a temperature sensor (3).

Description

Vorrichtung zur Auswertung des Signals eines ViskositatssensorsDevice for evaluating the signal of a viscosity sensor
Stand der TechnikState of the art
Die Erfindung geht aus von einer Vorrichtung zur Auswertung des Signals eines Viskositätssensors. Es sind bereits derartige Vorrichtungen bekannt, bei denen eine Verstärkung des Signals des Viskositätssensors erfolgt.The invention is based on a device for evaluating the signal of a viscosity sensor. Devices of this type are already known in which the signal from the viscosity sensor is amplified.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Vorrichtung zur Auswertung des Signals eines Viskositätssensors mit den Merkmalen des unabhängigen Patentanspruchs hat demgegenüber den Vorteil, dass der starke Einfluss der Temperatur auf die Messgröße Viskosität teilweise kompensiert wird. Die starke Aufweitung des Wertebereichs des Messsignals durch den Einfluss der Temperatur auf die Viskosität kann somit stark reduziert werden, was eine erhöhte Auflösung in der Auswertung des Messsignales erlaubt.In contrast, the device according to the invention for evaluating the signal of a viscosity sensor with the features of the independent patent claim has the advantage that the strong influence of temperature on the measured variable viscosity is partially compensated for. The strong widening of the value range of the measurement signal due to the influence of temperature on the viscosity can thus be greatly reduced, which allows an increased resolution in the evaluation of the measurement signal.
Weitere Vorteile und Verbesserungen ergeben sich durch die Merkmale der abhängigen Patentansprüche. Besonders einfach wird ein Verstärker verwendet, der einen Eingang für das Signal des Viskositätssensors und einen weiteren Eingang für ein Signal des Temperatursensors . Durch das Signal eines Temperatursensors wird die Verstärkung des Verstärkers gesteuert. Dabei ist es vorteilhaft, wenn der Viskositätssensor und der Temperatursensor in unmittelbarer Nähe zueinander in der Meßflüssigkeit angeordnet sind, da so sichergestellt wird, dass sich die Meßwerte von Viskositätssensor und Temperatursensor auf die gleiche Temperatur beziehen. Besonders einfach ist der Viskositätssensor als mikroakustischer Sensor ausgestaltet .Further advantages and improvements result from the features of the dependent claims. It is particularly simple to use an amplifier which has one input for the signal from the viscosity sensor and another input for a signal from the temperature sensor. The amplification of the amplifier is controlled by the signal from a temperature sensor. It is advantageous if the viscosity sensor and the temperature sensor are arranged in close proximity to one another in the measuring liquid, since this ensures that the measured values of the viscosity sensor and the temperature sensor relate to the same temperature. The viscosity sensor is particularly simple as a microacoustic sensor.
Zeichnungendrawings
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert . Die Figur 1 zeigt ein Ausführungsbeispiel der Erfindung .An embodiment of the invention is shown in the drawings and explained in more detail in the following description. Figure 1 shows an embodiment of the invention.
Beschreibungdescription
In der Figur 1 wird ein Blockschaltbild der erfindungsgemäßen Vorrichtung zur Auswertung des Signals eines Viskositätssensors gezeigt. In der Figur 1 wird schematisch ein Viskositätssensor gezeigt, der ein Viskositätssignal des Sensors Vs erzeugt. Dieses Signal Vs wird einer Verstärkerschaltung 2 zugeführt, wo das Signal verstärkt wird und dann als Ausgangssignal V ausgegeben wird. Die Intensität dieses Ausgangssignals V ist ein Maß für die Viskosität einer Meßflüssigkeit. Weiterhin ist noch ein Temperatursensor 3 vorgesehen, der ein Temperatursensorsignal T erzeugt. Das Signal des Temperatursensors T wird einem weiteren Eingang des Verstärkers 2 zugeführt. Der Verstärker 2 ist so ausgelegt, dass in Abhängigkeit von dem Temperatursignal T die Verstärkung des Verstärkers 2 gesteuert wird. Weiterhin wird das Temperatursignal T auch extern abgegeben. Die in der Figur 1 beschriebene Vorrichtung eignet sich für eine Bestimmung der Viskosität unter teilweiser Kompensation des Temperatureinflusses auf die Viskosität des Messmediums. Es wird hier insbesondere an die Bestimmung der Ölqualität in einem Kraftfahrzeugmotor gedacht, bei dem während des Meßbetriebs die Temperatur des Motoröls zwischen -20°C bis mehr als +120°C variiert. Zur Bestimmung der Viskosität ist daher in der Ölwanne ein Viskositätssensor vorgesehen. Die gemessene Viskosität des Motoröls kann zur Beurteilung der Qualität verwendet werden und es kann eine Empfehlung für einen Ölwechsel abgegeben werden. Durch diese Maßnahme können zum einen unnötige Ölwechsel vermieden werden bzw. die Wartungsintervalle eines Kraf fahrzeugmotors können entsprechend länger ausgestaltet werden.FIG. 1 shows a block diagram of the device according to the invention for evaluating the signal of a viscosity sensor. A viscosity sensor is shown schematically in FIG. 1, which generates a viscosity signal of the sensor V s . This signal V s is fed to an amplifier circuit 2, where the signal is amplified and then output as an output signal V. The intensity of this output signal V is a measure of the viscosity of a measuring liquid. Furthermore, a temperature sensor 3 is also provided, which generates a temperature sensor signal T. The signal of the temperature sensor T is fed to a further input of the amplifier 2. The amplifier 2 is designed such that the gain of the amplifier 2 is controlled as a function of the temperature signal T. Furthermore, the temperature signal T is also given externally. The device described in FIG. 1 is suitable for determining the viscosity with partial compensation of the temperature influence on the viscosity of the measuring medium. In particular, the determination of the oil quality in a motor vehicle engine is considered, in which the temperature of the engine oil varies between -20 ° C. and more than + 120 ° C. during the measuring operation. A viscosity sensor is therefore provided in the oil pan to determine the viscosity. The measured viscosity of the engine oil can be used to assess the quality and a recommendation for an oil change can be made. This measure on the one hand avoids unnecessary oil changes or the maintenance intervals of a motor vehicle engine can be made longer.
Für die Messung der Viskosität wird beispielsweise ein mikroakustischer Sensor verwendet. Bei derartigen mikroakustischen Sensoren wird ein Schwingelement in das Öl eingebracht, dessen Schwingungsfrequenz bzw. Dämpfung dieser Schwingung ein Maß für die Viskosität ist. Im folgenden wird angenommen, dass Schwingungsfrequenz bzw. Dämpfung in ein Analogsignal umgewandelt werden, welches die Viskosität repräsentiert. (Für die Frequenz kann dies z.B. über einen Frequenz-Spannungswandler geschehen) .For example, a microacoustic sensor is used to measure the viscosity. In such microacoustic sensors, an oscillating element is introduced into the oil, the oscillation frequency or damping of this oscillation is a measure of the viscosity. In the following it is assumed that the oscillation frequency or damping are converted into an analog signal which represents the viscosity. (For the frequency, this can be done using a frequency-voltage converter, for example).
Bei derartigen mikroakustischen Sensoren ist ein Sensorsignal des Viskositätssensors VS proportional zur Dichte p bzw. zur Viskosität η gemäß der Formel 1In such microacoustic sensors, a sensor signal from the viscosity sensor VS is proportional to the density p or to the viscosity η according to Formula 1
(1) Vsc (p η)1'2 (1) V s c (p η) 1 ' 2
oder alternativ einem entsprechendem Kehrwert, d.h. : ( 2 ) Vs cc l/ (p η ) 1/2or alternatively a corresponding reciprocal, ie: (2) V s cc l / (p η) 1/2
Ein typischer Sensor für Motoröl hat beispielsweise eine Sensorcharakteristik der Viskosität wie sie durch die Formel 2 ausgedrückt wird. In Verbindung mit der Temperaturabhängigkeit der Viskosität des Öles führt dies näherungsweise zu einem linearen Verlauf des Viskositätssignals des Sensors VS über der Temperatur gemäß FormelA typical engine oil sensor, for example, has a viscosity sensor characteristic as expressed by Formula 2. In connection with the temperature dependence of the viscosity of the oil, this leads approximately to a linear course of the viscosity signal of the sensor VS over the temperature according to the formula
(3) VS * kl + k2T(3) VS * kl + k2T
Bei den Konstanten kl und k2 handelt es sich um Konstanten, die von der Ölsorte abhängen. Die Temperaturabhängigkeit der Viskosität des Öls kann somit durch zwei Konstanten charakterisiert werden. Das Sensorsignal VS wird in den Verstärker 2 eingespeist und mit der Verstärkung A verstärkt :The constants kl and k2 are constants that depend on the type of oil. The temperature dependence of the viscosity of the oil can thus be characterized by two constants. The sensor signal VS is fed into the amplifier 2 and amplified with the gain A:
(4) V = A • VS(4) V = A • VS
Erfindungsgemäß wird nun die Verstärkung A mit einer Temperaturabhängigkeit versehen, so dass das ausgegebene Signal V über den gewünschten Temperaturbereich möglichst wenig von der Temperatur beeinflusst wird und somit immer ein unmittelbares Maß für die Viskosität des Öls darstellt. Für die in der Formel 3 dargestellte Abhängigkeit der Viskosität von der Temperatur bietet sich eine Verstärkung in der Form:According to the invention, the gain A is now provided with a temperature dependency, so that the output signal V is influenced as little as possible by the temperature over the desired temperature range and thus always represents a direct measure of the viscosity of the oil. For the dependency of viscosity on temperature as shown in Formula 3, there is a reinforcement in the form:
(5) A « 1/ (cl + c2T) an. Bei den Parametern Cl und C2 handelt es sich wieder um Konstanten. Die Konstanten werden natürlich am besten so gewählt, dass Kl = Cl und K2 = C2. Dies ermöglicht dann, dass das Ausgangssignal V ein vollständig temperaturabhängiges Maß für die Viskosität des durch die Konstanten Kl und K2 charakterisierten Öls ist. Üblicherweise können die Konstanten Cl und C2 so gewählt werden, dass für die viele Motoröle eine große Ähnlichkeit der Parameter realisiert wird, so dass die(5) A «1 / (cl + c2T) on. The parameters Cl and C2 are again constants. The constants are of course best chosen so that Kl = Cl and K2 = C2. This then enables the output signal V to be a completely temperature-dependent measure of the viscosity of the oil characterized by the constants K1 and K2. Usually, the constants C1 and C2 can be chosen so that for the many engine oils a great similarity of the parameters is realized, so that the
Temperaturabhängigkeit der Viskositätsmessung bei Motorölen deutlich verringert werden kann. Auf diese Art kann eine starke Aufweitung des Wertebereichs von V durch die starke Temperaturabhängigkeit der Viskosität von Ölen verhindert werden. Dementsprechend ergibt sich bei anschließender digitaler Weiterverarbeitung eine wesentlich höhere Auflösung in der Viskositätsmessung. Temperature dependence of the viscosity measurement for engine oils can be significantly reduced. In this way, a strong expansion of the value range of V can be prevented by the strong temperature dependence of the viscosity of oils. Accordingly, subsequent digital processing results in a significantly higher resolution in the viscosity measurement.

Claims

Ansprüche Expectations
1. Vorrichtung zur Auswertung des Signals eines Viskositatssensors (1) mit einer Verst rkerschaltung (2) für das Signal des Viskositätssensors (VS) , dadurch gekennzeichnet, dass die Verstärkerschaltung (2) eine vorgegebene Temperaturabhängigkeit für die Verstärkung (A) des Signals des Viskositätssensors (VS) aufweist.1. Device for evaluating the signal of a viscosity sensor (1) with an amplifier circuit (2) for the signal of the viscosity sensor (VS), characterized in that the amplifier circuit (2) has a predetermined temperature dependency for the gain (A) of the signal of the viscosity sensor (VS) has.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Verstärkerschaltung (2) einen Eingang für das Signal des Viskositatssensors (Vs) und einen weiteren Eingang für ein Signal (T) eines Temperatursensors (3) aufweist, und dass die Verstärkung (A) der Verstärkerschaltung (2) von dem Signal (T) des Temperatursensors (3) gesteuert wird.2. Device according to claim 1, characterized in that the amplifier circuit (2) has an input for the signal of the viscosity sensor (V s ) and a further input for a signal (T) of a temperature sensor (3), and that the gain (A ) the amplifier circuit (2) is controlled by the signal (T) of the temperature sensor (3).
3. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Viskositätssensor (1) und der Temperatursensor (2) in unmittelbarer Nähe in einem Meßmedium angeordnet sind.3. Device according to one of the preceding claims, characterized in that the viscosity sensor (1) and the temperature sensor (2) are arranged in the immediate vicinity in a measuring medium.
4. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Signal (Vs) des Viskositätssensors (1) nach der Formel:4. Device according to one of the preceding claims, characterized in that the signal (V s ) of the viscosity sensor (1) according to the formula:
von der Temperatur (T) und den Konstanten (K]_ und K2) abhängt . depends on the temperature (T) and the constants (K ] _ and K 2 ).
5. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Verstärkung (A) der Verstärkerschaltung (2) nach der Formel:5. Device according to one of the preceding claims, characterized in that an amplification (A) of the amplifier circuit (2) according to the formula:
A * l/(d + c2T)A * l / ( d + c 2 T)
von der Temperatur (T) und den Konstanten (C]_ und C2) abhängt . depends on the temperature (T) and the constants (C ] _ and C 2 ).
EP02740343A 2001-06-29 2002-05-11 Device for evaluating the signal of a viscosity sensor Withdrawn EP1405052A1 (en)

Applications Claiming Priority (3)

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DE10131429 2001-06-29
DE10131429A DE10131429A1 (en) 2001-06-29 2001-06-29 Device for evaluating the signal of a viscosity sensor
PCT/DE2002/001708 WO2003004999A1 (en) 2001-06-29 2002-05-11 Device for evaluating the signal of a viscosity sensor

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WO (1) WO2003004999A1 (en)

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WO2003004999A1 (en) 2003-01-16
JP2004521359A (en) 2004-07-15
DE10131429A1 (en) 2003-01-16
US7089784B2 (en) 2006-08-15
US20040045344A1 (en) 2004-03-11

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