DE10225716A1 - Determining oil change time point for internal combustion engine involves measuring permittivity of engine oil to determine degree of use, verifying result by measuring its optical transmissivity - Google Patents

Determining oil change time point for internal combustion engine involves measuring permittivity of engine oil to determine degree of use, verifying result by measuring its optical transmissivity Download PDF

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Publication number
DE10225716A1
DE10225716A1 DE2002125716 DE10225716A DE10225716A1 DE 10225716 A1 DE10225716 A1 DE 10225716A1 DE 2002125716 DE2002125716 DE 2002125716 DE 10225716 A DE10225716 A DE 10225716A DE 10225716 A1 DE10225716 A1 DE 10225716A1
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Germany
Prior art keywords
permittivity
oil
measuring
engine
internal combustion
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DE2002125716
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German (de)
Inventor
Stefan Dipl.-Ing. Hubrich
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Conti Temic Microelectronic GmbH
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Conti Temic Microelectronic GmbH
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Priority to DE2002125716 priority Critical patent/DE10225716A1/en
Publication of DE10225716A1 publication Critical patent/DE10225716A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F01M2011/14—Indicating devices; Other safety devices for indicating the necessity to change the oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices
    • F01M2011/14—Indicating devices; Other safety devices for indicating the necessity to change the oil
    • F01M2011/1413—Indicating devices; Other safety devices for indicating the necessity to change the oil by considering dielectric properties

Abstract

The method involves measuring the permittivity of the engine oil in order to determine its degree of use and verifying the result by measuring the optical transmissivity of the engine oil. A threshold value is specified for the permittivity. If the threshold is reached with continuously increasing permittivity and decreasing transmissivity a request to change the oil is made.

Description

Die Erfindung betrifft ein Verfahren zum Bestimmen des Ölwechselzeitpunktes bei einem Verbrennungsmotor nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method to determine the time of oil change in an internal combustion engine according to the preamble of the claim 1.

Aus dem Dokument DT 21 16 512 ist eine Vorrichtung zum Messen des Verschmutzungsgrades von Strömungsmitteln, insbesondere des Schmieröls von Motoren bekannt, bei der mittels einer Einrichtung die Lichtdurchlässigkeit einer Probe und ihr Streuvermögen mit der Lichtdurchlässigkeit und dem Streuvermögen eines Bezugsmaterials unter Verwendung einer Lichtquelle und Detektoren verglichen wird.From the document DT 21 16 512 A device for measuring the degree of pollution of fluids, in particular the lubricating oil of engines, is known, in which the light transmittance of a sample and its scattering capacity are compared by means of a device with the light transmission and the scattering capacity of a reference material using a light source and detectors.

Aus der Offenlegungsschrift DE 197 11 880 A1 ist ein Verfahren zur Bestimmung des Zeitpunktes für Schmierölwechsel bei Fahrzeugen bekannt, bei dem die Wirksamkeit des Schmieröls ständig überwacht wird, indem die Werte der Dielektrizitätskonstante des Schmieröls, der Viskosität und der elektrischen Leitfähigkeit kontinuierlich erfasst und mit im Fahrzeugversuch ermittelten Werten dieser Parameter verglichen werden. Bei einer vorgegebenen Abweichung der erfassten Werte von den im Versuch ermittelten weist eine Anzeige auf den fälligen Ölwechsel hin.From the published application DE 197 11 880 A1 A method for determining the point in time for lubricating oil change in vehicles is known, in which the effectiveness of the lubricating oil is continuously monitored by continuously recording the values of the dielectric constant of the lubricating oil, the viscosity and the electrical conductivity and comparing them with values determined in the vehicle test. If there is a predetermined deviation of the recorded values from those determined in the test, a display indicates that the oil change is due.

Aus der Offenlegungsschrift DE 100 13 590 A1 ist eine Einrichtung zur Prüfung und Anzeige des qualitativen Zustands von Öl bekannt, bei der mittels eines Viskositätssensors die Viskosität des Öls und mittels eines chemischen Sensors Oxidation, Nitration und Abbau von Verschleissadditiven gemessen und die Messsignale mit jeweiligen Referenzwerten verglichen werden. Sobald die gemessenen Werte um einen jeweils bestimmten Betrag von den Referenzwerten abweichen, wird mittels einer geeigneten Anzeigevorrichtung auf den vorzunehmenden Ölwechsel hingewiesen.From the published application DE 100 13 590 A1 A device for testing and displaying the qualitative state of oil is known, in which the viscosity of the oil is measured by means of a viscosity sensor and oxidation, nitration and degradation of wear additives are measured by means of a chemical sensor, and the measurement signals are compared with respective reference values. As soon as the measured values deviate from the reference values by a certain amount, a suitable display device indicates the oil change to be made.

Wenn lediglich die Permittivität gemessen wird kann der Messwert durch Treibstoff- und Wassereintrag im Öl oder durch Vermischung mit nachgefülltem Frischöl verfälscht werden; nachteilig ist zudem die geringe Dynamik-Veränderung im Bereich von weniger als 20%. Auf Basis der Messung der Leitfähigkeit ist eine eindeutige Aussage über die Ölqualität nicht möglich, da die Leitfähigkeit auch von der Ölsorte abhängt. Die Messung der Viskosität ist zur Beurteilung der Ölqualität umstritten, das sie vom Treibstoff- und Wassereintrag abhängig ist. Einen chemischen Parameter zu messen ist technisch aufwändig; der Aufwand vergrößert sich weiter, wenn mehrere Parameter gleichzeitig gemessen werden sollen. Die Messung der optischen Transmission als alleinige Kenngröße für die Alterung des Öls ist nicht aussagekräftig.If only the permittivity is measured can the measured value by fuel and water in the oil or by Mixing with refilled fresh oil falsified become; Another disadvantage is the low dynamic change in the range of less than 20%. Based on the measurement of conductivity is a clear statement about the oil quality is not possible, because the conductivity also by the type of oil depends. The measurement of viscosity is controversial for assessing oil quality, that it depends on the fuel and water input. A chemical Measuring parameters is technically complex; the effort increases continue if several parameters are to be measured simultaneously. The measurement of optical transmission as the sole parameter for aging of the oil is not meaningful.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Bestimmen des Ölwechselzeitpunktes bei einem Verbrennungsmotor nach dem Oberbegriff des Patentanspruchs 1 so zu gestalten, dass eine sichere Aussage über den richtigen Ölwechsefzeitpunkt gemacht werden kann.The invention is based on the object Procedure for determining the time of oil change in an internal combustion engine according to the preamble of the claim 1 to be designed so that a reliable statement about the correct time of oil change can be made.

Gelöst wird diese Aufgabe durch ein Verfahren mit den im Anspruch 1 angegebenen Merkmalen.This task is solved by a method with the features specified in claim 1.

Das Verfahren nach Anspruch 1 weist die Vorteile auf, dass bei vertretbarem Aufwand eine sicherere Aussage über den optimalen Ölwechselzeitpunkt gemacht werden kann als mit den nach dem Stand der Technik bekannten Verfahren.The method of claim 1 has the advantages that a more reliable statement about the optimal oil change time can be made as with those known in the prior art Method.

Die Erfindung eignet sich insbesondere zum Bestimmen des Ölwechselzeitpunktes bei einem Fahrzeug mit Verbrennungsmotor.The invention is particularly suitable to determine the time of oil change in a vehicle with an internal combustion engine.

Vorteilhafte Ausgestaltungen des Verfahrens nach Anspruch 1 sind in den Unteransprüchen angegeben.Advantageous embodiments of the Process according to claim 1 are specified in the subclaims.

Die Erfindung wird nun anhand eines Ausführungsbeispiels unter Zuhilfenahme der Zeichnung erläutert.The invention is now based on a embodiment explained with the aid of the drawing.

Es zeigen

  • 1: ein Diagramm, welches die Veränderung der Permittivität des Motorenöls über der Zeit zeigt und
  • 2: ein Diagramm, in dem das Ausgangssignal der Transmissionsmessung des Motorenöls über der Zeit dargestellt ist.
Show it
  • 1 : a diagram showing the change in the permittivity of the engine oil over time and
  • 2 : a diagram showing the output signal of the transmission measurement of the engine oil over time.

Mittels eines geeigneten und bekannten ersten Sensors wird im Verbrennungsmotor eines Fahrzeugs die Permittivität εr (Dielektrizitätskonstante) des Motoröls gemessen. Die Permittivität eines bestimmten Motoröls weist beispielsweise bei einer Laufzeit von 50 Stunden einen Wert von εr = 2,32 auf, wie dies im Diagramm der 1 dargestellt ist. In Folge eines ungefähr linearen Anstiegs beträgt die Permittivität bei einer Laufzeit von 100 Stunden ca. εr = 2,38, bei einer Laufzeit von 150 Stunden ca. εr = 2,42 und bei einer Laufzeit von 200 Stunden ca. εr = 2,46. Der Grund für den Anstieg der Permittivität εr mit zunehmender Laufzeit ist die Alterung des Motoröls durch Verschmutzung beim Betrieb des Motors.The permittivity ε r (dielectric constant) of the engine oil is measured in the internal combustion engine of a vehicle by means of a suitable and known first sensor. The permittivity of a certain engine oil has a value of ε r = 2.32, for example, with a running time of 50 hours, as shown in the diagram in FIG 1 is shown. Resulted in an approximately linear increase the permittivity and a run time of 100 hours is approximately ε r = 2.38, and a run time of 150 hours approximately r ε = 2.42 and a run time of 200 hours approximately r = ε 2.46. The reason for the increase in the permittivity ε r with increasing runtime is the aging of the engine oil due to contamination during engine operation.

Gleichzeitig wird mittels eines zweiten Sensors die Transmission (optische Trübung) des Motoröls gemessen. Gemäß 2 weist das Ausgangssignal des zweiten Sensors für die Transmission bei einer Laufzeit von 0 h eine Spannung von ca. 3,1 V auf, bei einer Laufzeit von 50 h eine Spannung von ca. 3,0 V, bei einer Laufzeit von 90 h eine Spannung von ca. 2,0 V, bei einer Laufzeit von 130 h eine Spannung von ca. 1,0 V und bei einer Laufzeit von 160 h eine Spannung von ca. 0,5 V auf; bei einer Laufzeit von 180 h beträgt das Ausgangssignal ca. 0,25 V.At the same time, the transmission (optical turbidity) of the engine oil is measured using a second sensor. According to 2 the output signal of the second sensor for the transmission has a voltage of approximately 3.1 V for a running time of 0 h, a voltage of approximately 3.0 V for a running time of 50 h, and a voltage for a running time of 90 h of approx. 2.0 V, with a running time of 130 h a voltage of approx. 1.0 V and with a running time of 160 h a voltage of approx. 0.5 V; with a running time of 180 h the output signal is approx. 0.25 V.

Im Falle einer echten Alterung des Motoröls folgen die Signale der Permittivität und der Transmission den in 1 und 2 dargestellten Verläufen. Aufgrund ansteigender Verschmutzung steigt die Permittivität εr kontinuierlich an, während die Transmission permanent abnimmt. Verlaufen Permittivität εr und Transmission gemäß den in 1 und 2 dargestellten Verläufen, wird für die Permittivität εr ein Grenzwert gesetzt. Sobald dieser Grenzwert erreicht ist, wird beispielsweise dem Fahrer mittels eines optischen Signals eine Aufforderung zum Wechsel des Motoröls gegeben.In the event of a real aging of the engine oil, the signals of permittivity and transmission follow the in 1 and 2 shown courses. Due to increasing contamination, the permittivity ε r increases continuously, while the transmission permanently decreases. Permittivity ε r and transmission run according to the in 1 and 2 shown courses, a limit is set for the permittivity ε r . As soon as this limit value is reached, the driver is, for example, given an optical signal to change the engine oil.

Führen Einflüsse durch lichtdurchlässige Komponenten wie Wasser- oder Kraftstoffeintrag oder die Vermischung mit frischem Motoröl und höherer Dielektrizitätskonstante zu einer Erhöhung der Permittivität εr, so wird die Transmission des Motoröls gleich bleiben oder sogar zunehmen, und nicht wie aufgrund der Alterung des Motoröls erwartet, abnehmen. Eine allein aufgrund der Permittivitäts-Messung mögliche Falschaussage wird durch die zusätzliche Messung der Transmission erkannt und eine Aufforderung zum Wechsel des Motoröls unterbleibt.If influences caused by translucent components such as water or fuel input or the mixing with fresh motor oil and a higher dielectric constant lead to an increase in the permittivity ε r , the transmission of the motor oil will remain the same or even increase and will not decrease as expected due to the aging of the motor oil , A false statement that is possible solely on the basis of the permittivity measurement is recognized by the additional measurement of the transmission and a request to change the engine oil is omitted.

Stattdessen wird bei Wasser- oder Kraftstoffeintrag die Motortemperatur und damit auch die Motoröltemperatur erhöht (Heißfahrt), um dadurch den Wasser- oder Kraftstoffeintrag auszutreiben bzw. bei Neuöleintrag ein neuer, höherer Grenzwert für die Permittivität εr festgelegt. Ob Wasser- oder Kraftstoffeintrag bzw. Neuöleintrag vorliegt, wird durch eine übergeordnete Sensorik und einen zugehörigen Algorithmus bestimmt. Von einem Neuöleintrag wird dann ausgegangen, wenn beispielsweise zwischen zwei Einschaltvorgängen der Zündung der Ölstand abrupt angestiegen ist.Instead, the engine temperature and thus also the engine oil temperature is increased (hot run) when water or fuel is introduced in order to drive out the water or fuel input or, when new oil is introduced, a new, higher limit value for the permittivity ε r is set. A higher-level sensor system and an associated algorithm determine whether there is water or fuel input or new oil input. A new oil entry is assumed if, for example, the oil level has risen abruptly between two switching-on processes of the ignition.

Claims (6)

Verfahren zum Bestimmen des Ölwechselzeitpunktes bei einem Verbrennungsmotor, bei dem zum Erfassen des Verbrauchsgrades die Permittivität des Motoröls gemessen und das Ergebnis durch das Ergebnis der Messung der optischen Transmission des Motoröls verifiziert wird.Procedure for determining the time of oil change at a Internal combustion engine in which to record the degree of consumption permittivity of the engine oil measured and the result by the result of measuring the optical Transmission of the engine oil is verified. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass für die Permittivität ein Grenzwert festgelegt wird.A method according to claim 1, characterized in that a limit value for the permittivity is set. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, dass bei einer stetig zunehmenden Permittivität und einer stetig abnehmenden optischen Transmission beim Erreichen des Grenzwertes für die Permittivität eine Aufforderung zum Wechsel es Motoröls erfolgt.A method according to claim 1 and 2, characterized in that with a constantly increasing permittivity and a constantly decreasing optical transmission when the limit for permittivity is reached a request to change it engine oil he follows. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, dass bei einer stetig zunehmenden Permittivität, einer gleichbleibenden oder zunehmenden optischen Transmission und ungefähr gleichbleibendem Ölstand beim Erreichen des Grenzwertes der Permittivität die Öltemperatur erhöht wird.A method according to claim 1 and 2, characterized in that with a constantly increasing permittivity, a constant or increasing optical transmission and approximately constant oil level at When the limit of permittivity is reached the oil temperature is increased. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass bei einer stetig zunehmenden Permittivität, einer gleichbleibenden oder zunehmenden optischen Transmission und einer abrupten Zunahme des Ölstands ein neuer Grenzwert für die Permittivität festgelegt wird.A method according to claim 2, characterized in that at a steadily increasing permittivity, a constant or increasing optical transmission and an abrupt increase in the oil level a new limit for the permittivity set becomes. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass der neue Grenzwert für die Permittivität höher als der alte Grenzwert ist.A method according to claim 5, characterized in that the new limit for the permittivity higher than is the old limit.
DE2002125716 2002-06-11 2002-06-11 Determining oil change time point for internal combustion engine involves measuring permittivity of engine oil to determine degree of use, verifying result by measuring its optical transmissivity Ceased DE10225716A1 (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006110356A2 (en) * 2005-04-08 2006-10-19 The Lubrizol Corporation Method for on-line fuel-dilution monitoring of engine lubricant
DE102009028055A1 (en) 2008-08-04 2010-02-11 Deere & Company, Moline Self-propelled agricultural harvesting machine comprises frame, and working elements for feeding or processing harvested crop, where working elements are propelled by drive belt
DE102009028094A1 (en) 2008-08-04 2010-02-11 Deere & Company, Moline Self-propelled agricultural harvesting machine, has crank shaft brought in drive connection with pulley by belt pulley, where belt pulley stays in drive connection with pump unit for hydraulic maintenance of traction drive
DE102009028056A1 (en) 2008-08-12 2010-02-18 Deere & Company, Moline Self-propelled agricultural harvester i.e. field chopper, has driving belt drivable by belt pulley, and combustion engines comprising crank shafts in drive connection with belt pulley by belt drive and drive shaft, respectively
DE102009028175A1 (en) 2009-02-27 2010-09-02 Deere & Company, Moline Self-propelled harvester
US20120125087A1 (en) * 2010-07-08 2012-05-24 Baker Hughes Incorporated Optical method for determining fouling of crude and heavy fuels
DE102006041075B4 (en) * 2006-09-01 2018-10-18 Robert Bosch Gmbh Analysis method for an engine oil and analyzer
DE102018208791A1 (en) 2018-06-05 2019-12-05 Deere & Company Monitoring the ingredients of a warehouse of a harvester
US10739327B2 (en) * 2015-05-08 2020-08-11 Danfoss (Tianjin) Ltd. Apparatus and method for monitoring the quality of a lubricant in a compressor
DE102020004529A1 (en) 2020-07-27 2022-01-27 Daimler Ag Method of monitoring a condition of a lubricant

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006110356A3 (en) * 2005-04-08 2008-04-24 Lubrizol Corp Method for on-line fuel-dilution monitoring of engine lubricant
AU2006234988B2 (en) * 2005-04-08 2011-11-24 The Lubrizol Corporation Method for on-line fuel-dilution monitoring of engine lubricant
WO2006110356A2 (en) * 2005-04-08 2006-10-19 The Lubrizol Corporation Method for on-line fuel-dilution monitoring of engine lubricant
DE102006041075B4 (en) * 2006-09-01 2018-10-18 Robert Bosch Gmbh Analysis method for an engine oil and analyzer
DE102009028055B4 (en) 2008-08-04 2020-01-16 Deere & Company Self-propelled harvester
DE102009028055A1 (en) 2008-08-04 2010-02-11 Deere & Company, Moline Self-propelled agricultural harvesting machine comprises frame, and working elements for feeding or processing harvested crop, where working elements are propelled by drive belt
DE102009028094A1 (en) 2008-08-04 2010-02-11 Deere & Company, Moline Self-propelled agricultural harvesting machine, has crank shaft brought in drive connection with pulley by belt pulley, where belt pulley stays in drive connection with pump unit for hydraulic maintenance of traction drive
DE102009028056A1 (en) 2008-08-12 2010-02-18 Deere & Company, Moline Self-propelled agricultural harvester i.e. field chopper, has driving belt drivable by belt pulley, and combustion engines comprising crank shafts in drive connection with belt pulley by belt drive and drive shaft, respectively
DE102009028056B4 (en) 2008-08-12 2022-02-10 Deere & Company Self-propelled harvester
DE102009028175A1 (en) 2009-02-27 2010-09-02 Deere & Company, Moline Self-propelled harvester
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US8230667B2 (en) 2009-02-27 2012-07-31 Deere & Company Self-propelled harvesting machine
US20120125087A1 (en) * 2010-07-08 2012-05-24 Baker Hughes Incorporated Optical method for determining fouling of crude and heavy fuels
US9038451B2 (en) * 2010-07-08 2015-05-26 Baker Hughes Incorporated Optical method for determining fouling of crude and heavy fuels
US10739327B2 (en) * 2015-05-08 2020-08-11 Danfoss (Tianjin) Ltd. Apparatus and method for monitoring the quality of a lubricant in a compressor
BE1026307A1 (en) 2018-06-05 2019-12-17 Deere & Co Monitoring the contents of a harvesting machine warehouse
DE102018208791A1 (en) 2018-06-05 2019-12-05 Deere & Company Monitoring the ingredients of a warehouse of a harvester
DE102020004529A1 (en) 2020-07-27 2022-01-27 Daimler Ag Method of monitoring a condition of a lubricant

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