EP1728983A1 - Méthode de détermination de la durée de vie restante de l'huile de lubrification d'un moteur à combustion - Google Patents

Méthode de détermination de la durée de vie restante de l'huile de lubrification d'un moteur à combustion Download PDF

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Publication number
EP1728983A1
EP1728983A1 EP05425391A EP05425391A EP1728983A1 EP 1728983 A1 EP1728983 A1 EP 1728983A1 EP 05425391 A EP05425391 A EP 05425391A EP 05425391 A EP05425391 A EP 05425391A EP 1728983 A1 EP1728983 A1 EP 1728983A1
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EP
European Patent Office
Prior art keywords
lubricating oil
physico
qualitative
engine
oil
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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.)
Granted
Application number
EP05425391A
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German (de)
English (en)
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EP1728983B1 (fr
Inventor
M. C.R.F. Società Consortile per Azioni Gambera
C. C.R.F. Società Consortile per Azioni Borello
N. C.R.F. Società Consortile per Azioni Francone
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Centro Ricerche Fiat SCpA
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Centro Ricerche Fiat SCpA
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Priority to AT05425391T priority Critical patent/ATE524641T1/de
Priority to EP05425391A priority patent/EP1728983B1/fr
Publication of EP1728983A1 publication Critical patent/EP1728983A1/fr
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Publication of EP1728983B1 publication Critical patent/EP1728983B1/fr
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    • 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

Definitions

  • the present invention relates to a method for estimating the residual life of the lubricating oil of an internal-combustion engine.
  • lubricating oil for internal-combustion engines has principally the function of reducing friction between the mechanical parts of the engine, as well as that of cooling the engine and protecting it from the action of oxidizing agents.
  • lubricating oil undergoes a slow and irreversible deterioration, due principally to the absorption of carbon residue and particulate matter originating from the process of combustion, commonly known as soot, and other debris, which are generated by the rubbing of the various mechanical parts of the engine, as well as to the formation and absorption of lacquers and sludge.
  • Deterioration of the lubricating oil takes the form of a reduction in its lubricating power, or lubricating capacity, which depends, among other things, upon the chemico-physical characteristics of the lubricating oil, such as viscosity, total base number (TBN) or, alternatively, total acid number (TAN).
  • TBN total base number
  • TAN total acid number
  • the viscosity depends upon the running temperature of the engine and decreases as the temperature increases on account of the formation of polymers and byproducts of oxidation, such as lacquers and sludge, and is affected by the presence of particles, the chemical formulation of the oil, and its contamination by water, fuel and coolant.
  • the reduction of the total base number is indicative of a progressive exhaustion of the anti-oxidizing additives present in the lubricating oil, which have the purpose of protecting the engine from corrosion, which is caused principally by the formation of acids deriving from the process of combustion.
  • an oil change for an engine of a motor vehicle is usually carried out according to the programme established by the coupons for periodic maintenance prescribed by the automobile manufacturers, which, usually, involve a number of operations of maintenance to be carried out on the individual elements of the vehicle for the purpose of reducing the number of interventions and, consequently, are the result of a series of compromises between different requirements.
  • the document No. US 6.266,587 describes a method for determination of when it is necessary to carry out an oil change for the engine of a vehicle according to the recorded operating parameters of the engine.
  • the engine r.p.m. and at least one other operating parameter important for the ageing of the oil are continuously recorded, and, on the basis of these recorded parameters, a fictitious distance is determined, which is subtracted from a pre-set total distance in order to establish the operating distance that remains up to the next oil change.
  • US 6.253,601 describes a system of determination of the interval of oil change, in which at pre-set intervals of time there are estimated, and accumulated separately, generation of soot, increase in viscosity, and reduction in the total base number of the lubricating oil, on the basis of current engine parameters measured, such as the temperature of the engine, the flow rate of fuel supplied to the engine, and the running rate and load of the engine.
  • the driver is then warned of the need for an oil change.
  • This system moreover envisages the use of sensors, such as an oil-level sensor, a soot sensor and a viscosity sensor, in order to validate in real time the calculated values of soot generated, of increase in viscosity of the oil and of reduction in the total base number, and in order to prevent operating conditions that might prove catastrophic for the engine and are not detectable by mere calculation.
  • sensors such as an oil-level sensor, a soot sensor and a viscosity sensor
  • the aim of the present invention is to provide a method for estimating in a reliable way the residual life of the lubricating oil of an internal-combustion engine, without having to resort to the use of any sensors.
  • a method for estimating the residual life of the oil of an internal-combustion engine, as defined in Claim 1.
  • Figure 1 is a flowchart of the method for estimating the residual life of the lubricating oil of an internal-combustion engine according to the invention, said method being implemented by an electronic control unit (not shown) on board the motor vehicle.
  • a first table shown in Figure 2, containing, among other things, limit values of some quantities indicating the quality of the lubricating oil, in particular the amounts of soot, of lacquers, and of sludge present in the lubricating oil and designated, respectively, by Soot, Laq, Sld, the viscosity of the lubricating oil at 40°C, designated by Visc, and the total base number, designated by TBN (or, alternatively, the total acid number TAN) of the lubricating oil, the limit values of which represent thresholds, beyond which it is assumed that the degradation of the lubricating oil is such that the lubrication of the engine will no longer occur in an optimal way and it is thus advisable to carry out an oil change.
  • limit values of some quantities indicating the quality of the lubricating oil in particular the amounts of soot, of lacquers, and of sludge present in the lubricating oil and designated, respectively, by Soot, Laq, Sld, the viscosity
  • the first table shown in Figure 2 contains the following limit values:
  • a second table (not shown) containing threshold values of some engine quantities used during operations of comparison carried out when estimating the residual life of the lubricating oil, in the way described in detail in what follows, and namely:
  • the electronic control unit resets the values of physico-chemical quantities for the previous session of estimation of the residual life of the lubricating oil, in particular the recapitulatory quantities determined in the previous estimation session, the distance covered by the vehicle from the last updating of the qualitative physico-chemical quantities of the lubricating oil, the distance covered by the vehicle from the last oil change, and the table shown in Figure 2.
  • the electronic control unit calculates the following recapitulatory quantities summarizing the conditions of use of the engine from the last oil change on the basis of the engine quantities acquired and calculated in block 20 (block 30):
  • the electronic control unit updates the distance KM _EST , in kilometres, covered by the vehicle from the last updating of the qualitative physico-chemical quantities of the lubricating oil (block 40).
  • the electronic control unit checks whether the vehicle has covered a given distance, for example 1000 km, from the last updating of the qualitative physico-chemical quantities of the lubricating oil (block 50). If it has not (output NO from block 50), the electronic control unit once again repeats the operations previously described starting from block 20, continuously updating the distance covered by the vehicle from the last updating of the qualitative physico-chemical quantities of the lubricating oil and the recapitulatory quantities referred to above; otherwise (output YES from block 50), the electronic control unit resets the distance covered by the vehicle from the last updating of the qualitative physico-chemical quantities of the lubricating oil (block 60) and then calculates the values of the following qualitative physico-chemical quantities of the lubricating oil (block 70) according to at least one recapitulatory quantity in the following way:
  • the electronic control unit stores the calculated values of the qualitative physico-chemical quantities of the lubricating oil in a table of the type shown in Figure 3 (block 80).
  • the electronic control unit updates the table of Figure 3 by simply storing the new calculated values of the qualitative physico-chemical quantities of the lubricating oil, and the distance at which they have been calculated, whilst, if for each of the qualitative physico-chemical quantities of the lubricating oil in the table of Figure 4 there has already been stored the aforesaid given number of values (ten), then the electronic control unit updates the table of Figure 3 eliminating the "older" values of the qualitative physico-chemical quantities of the lubricating oil, i.e., those calculated at the shorter distance covered by the vehicle present in
  • the electronic control unit checks whether the aforesaid given number of values (ten) is stored in the table of Figure 3 for each qualitative physico-chemical quantity of lubricating oil (block 90). If it is not (output NO from block 90), then the operations resume from those previously described starting from block 20, i.e., continuing updating of the distance covered by the vehicle from the last updating of the qualitative physico-chemical quantities of the lubricating oil and the recapitulatory quantities referred to above for the calculation of new values of the qualitative physico-chemical quantities of the lubricating oil.
  • the electronic control unit calculates, on the basis of the values contained in the table of Figure 3, the residual life of the lubricating oil in terms of distance that can still be covered by the vehicle before the oil change (blocks 100-140).
  • the electronic control unit determines and stores in Table 2 the values of characteristic parameters a, band F of a respective line of regression, which is determined using the least-squares method and represents a linear modelling of said quantity as a function of the distance covered by the vehicle (block 100).
  • the electronic control unit checks whether the model of each qualitative physico-chemical quantity of lubricating oil, represented by the respective line of regression, is statistically significant (block 110), and, according to the outcome of this check, calculates, for each qualitative physico-chemical quantity of lubricating oil considered irrespective of the others, the corresponding residual autonomy of the vehicle, in kilometres, before it is necessary to carry out the oil change, i.e., the distance that can still be covered by the vehicle before said quantity exceeds the corresponding limit value (block 120).
  • the electronic control unit performs the following operations:
  • the electronic control unit checks whether the angular coefficient (slope) b of the respective line of regression is greater than or equal to 0, and whether the quantity F of the respective model is greater than or equal to a threshold value, for example 2.
  • the respective modellings are considered statistically not significant, and for these the electronic control unit considers, as total distance that can be covered by the vehicle between one oil change and the next, the last value calculated in conditions of statistically significant modelling. If upon the first execution of the calculation of the total distance that can be covered by the vehicle the modelling is not statistically significant, used as total distance that can be covered is a maximum distance stored, which is, for example, equal to the one indicated in the user operating and servicing instructions for the oil change.
  • the electronic control unit checks whether the quantity F of the respective model is greater than or equal to a threshold value, for example 2.
  • kmVisc is considered as total distance, in kilometres, that the vehicle can cover altogether, starting from the previous oil change, before the viscosity reaches a value such as to render the oil change advisable.
  • the model is then not considered statistically significant, and hence the electronic control unit considers, as total distance that can be covered by the vehicle between one oil change and the next, the last value calculated in conditions of reliable modelling.
  • the model is not statistically significant, as total distance that can be covered a maximum stored distance is used, which is, for example, equal to the one indicated in the user operating and servicing instructions for the oil change.
  • the electronic control unit checks whether the angular coefficient (slope) b of the corresponding line of regression is smaller than or equal to 0 and whether the quantity F of the respective model is greater than or equal to a threshold value, for example 2.
  • the model is not considered statistically significant, and the electronic control unit hence considers, as total distance that can be covered by the vehicle between one oil change and the next, the last value calculated in conditions of reliable modelling.
  • a stored maximum distance for example equal to the one indicated in the user operating and servicing instructions for the oil change, is used as total distance that can be covered.
  • the residual distance that can still be covered by the vehicle before having to change the lubricating oil could be calculated also considering any subset of the quantities indicating the aforementioned quality of the lubricating oil, as likewise the qualitative physico-chemical quantities of the lubricating oil could be determined on the basis of recapitulatory quantities other than those indicated.
  • the method according to the invention could be further enriched in order to take into account also any possible topping-up of lubricating oil that can occur between two subsequent oil changes.
  • a check is made on whether the topping-up has been performed and on the amount of oil involved, and, at each key-on of the vehicle, the level of the lubricating oil is stored (information that is known to the electronic control unit and is supplied by a level sensor purposely provided in the tank of the lubricating oil) and then the level of the lubricating oil between one key-on and the next is compared.
  • a given threshold for example, 1 kg
  • the lines of regression of the qualitative physico-chemical quantity of lubricating oil calculated in the way previously described are modified accordingly.
  • topping-up can be readily extended also to the case of multiple operations of topping-up.
  • the driver can be warned of an excessive consumption of the lubricating oil and of the need to carry out a check.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
EP05425391A 2005-05-30 2005-05-30 Méthode de détermination de la durée de vie restante de l'huile de lubrification d'un moteur à combustion Not-in-force EP1728983B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT05425391T ATE524641T1 (de) 2005-05-30 2005-05-30 Verfahren zum abschätzung der ölrestlebensdauer einer brennkraftmaschine
EP05425391A EP1728983B1 (fr) 2005-05-30 2005-05-30 Méthode de détermination de la durée de vie restante de l'huile de lubrification d'un moteur à combustion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425391A EP1728983B1 (fr) 2005-05-30 2005-05-30 Méthode de détermination de la durée de vie restante de l'huile de lubrification d'un moteur à combustion

Publications (2)

Publication Number Publication Date
EP1728983A1 true EP1728983A1 (fr) 2006-12-06
EP1728983B1 EP1728983B1 (fr) 2011-09-14

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EP05425391A Not-in-force EP1728983B1 (fr) 2005-05-30 2005-05-30 Méthode de détermination de la durée de vie restante de l'huile de lubrification d'un moteur à combustion

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EP (1) EP1728983B1 (fr)
AT (1) ATE524641T1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010023388A1 (fr) * 2008-08-29 2010-03-04 Peugeot Citroën Automobiles SA Strategie de controle de la qualite du lubrifiant d'un moteur diesel
US20130197830A1 (en) * 2012-02-01 2013-08-01 Afton Chemical Corporation System and method for determining a lubricant discard interval
US20140343786A1 (en) * 2012-02-01 2014-11-20 Afton Chemical Corporation System and method for determining a lubricant discard interval
US8965625B2 (en) 2012-02-01 2015-02-24 Afton Chemical Corporation System and method for extending a lubricant discard interval
DE102008003074B4 (de) * 2007-01-08 2015-10-22 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren zum Überwachen der Öllebensdauer eines Dieselmotorsystems
CN105298587A (zh) * 2015-04-28 2016-02-03 潍柴动力股份有限公司 发动机的润滑油寿命检测方法、装置及系统
EP3312397A4 (fr) * 2015-07-17 2018-07-04 Panasonic Intellectual Property Management Co., Ltd. Dispositif et procédé de détection de durée de vie d'huile
CN111709567A (zh) * 2020-06-09 2020-09-25 西安交通大学 基于螺杆压缩机滑动轴承轴心轨迹的润滑油剩余寿命预测方法及系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4677847A (en) * 1985-09-30 1987-07-07 Aisin Seiki Kabushiki Kaisha Automotive engine oil monitoring system
US5750887A (en) * 1996-11-18 1998-05-12 Caterpillar Inc. Method for determining a remaining life of engine oil
US5969601A (en) * 1997-09-05 1999-10-19 Komatsu Ltd. Apparatus and method for predicting replacement timing of engine lubricating oil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4677847A (en) * 1985-09-30 1987-07-07 Aisin Seiki Kabushiki Kaisha Automotive engine oil monitoring system
US5750887A (en) * 1996-11-18 1998-05-12 Caterpillar Inc. Method for determining a remaining life of engine oil
US5969601A (en) * 1997-09-05 1999-10-19 Komatsu Ltd. Apparatus and method for predicting replacement timing of engine lubricating oil

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008003074B4 (de) * 2007-01-08 2015-10-22 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren zum Überwachen der Öllebensdauer eines Dieselmotorsystems
WO2010023388A1 (fr) * 2008-08-29 2010-03-04 Peugeot Citroën Automobiles SA Strategie de controle de la qualite du lubrifiant d'un moteur diesel
FR2935431A1 (fr) * 2008-08-29 2010-03-05 Peugeot Citroen Automobiles Sa Stategie de controle de la qualite du lubrifiant d'un moteur diesel.
RU2509899C2 (ru) * 2008-08-29 2014-03-20 Пежо Ситроен Отомобиль Са Способ контроля качества смазочного материала дизельного двигателя
US20130197830A1 (en) * 2012-02-01 2013-08-01 Afton Chemical Corporation System and method for determining a lubricant discard interval
US20140343786A1 (en) * 2012-02-01 2014-11-20 Afton Chemical Corporation System and method for determining a lubricant discard interval
US8965625B2 (en) 2012-02-01 2015-02-24 Afton Chemical Corporation System and method for extending a lubricant discard interval
US8977421B2 (en) * 2012-02-01 2015-03-10 Afton Chemical Corporation System and method for determining a lubricant discard interval
CN105298587A (zh) * 2015-04-28 2016-02-03 潍柴动力股份有限公司 发动机的润滑油寿命检测方法、装置及系统
EP3312397A4 (fr) * 2015-07-17 2018-07-04 Panasonic Intellectual Property Management Co., Ltd. Dispositif et procédé de détection de durée de vie d'huile
CN111709567A (zh) * 2020-06-09 2020-09-25 西安交通大学 基于螺杆压缩机滑动轴承轴心轨迹的润滑油剩余寿命预测方法及系统
CN111709567B (zh) * 2020-06-09 2023-05-02 西安交通大学 基于螺杆压缩机滑动轴承轴心轨迹的润滑油剩余寿命预测方法及系统

Also Published As

Publication number Publication date
ATE524641T1 (de) 2011-09-15
EP1728983B1 (fr) 2011-09-14

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