EP2067946A1 - Procédé et système de détection de la dilution du lubrifiant par le carburant - Google Patents

Procédé et système de détection de la dilution du lubrifiant par le carburant Download PDF

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Publication number
EP2067946A1
EP2067946A1 EP07122384A EP07122384A EP2067946A1 EP 2067946 A1 EP2067946 A1 EP 2067946A1 EP 07122384 A EP07122384 A EP 07122384A EP 07122384 A EP07122384 A EP 07122384A EP 2067946 A1 EP2067946 A1 EP 2067946A1
Authority
EP
European Patent Office
Prior art keywords
crankcase
engine
sensor
gases
lubricant
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.)
Granted
Application number
EP07122384A
Other languages
German (de)
English (en)
Other versions
EP2067946B1 (fr
Inventor
Peter Kraehenbuehl
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.)
FPT Motorenforschung AG
Original Assignee
Iveco Motorenforschung 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 Iveco Motorenforschung AG filed Critical Iveco Motorenforschung AG
Priority to EP07122384A priority Critical patent/EP2067946B1/fr
Priority to ES07122384T priority patent/ES2390597T3/es
Priority to AU2008249218A priority patent/AU2008249218B2/en
Priority to CN2008101836693A priority patent/CN101451987B/zh
Priority to BRPI0822412A priority patent/BRPI0822412B8/pt
Publication of EP2067946A1 publication Critical patent/EP2067946A1/fr
Application granted granted Critical
Publication of EP2067946B1 publication Critical patent/EP2067946B1/fr
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Anticipated expiration legal-status Critical

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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
    • F01M1/00—Pressure lubrication
    • F01M1/18—Indicating or 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
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F01M2001/165—Controlling lubricant pressure or quantity according to fuel dilution in oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/11—Oil dilution, i.e. prevention thereof or special controls according thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1459—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a hydrocarbon content or concentration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/06—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding lubricant vapours

Definitions

  • This invention relates to a method for detecting the dilution of the lubricant by the fuel in an internal-combustion engine, in particular an engine provided with combustion chambers, delimitated between cylinders and pistons, and with a crankcase, in communication with said cylinders, in which a stock of lubricating oil is stored, more in particular a diesel engine for a vehicle.
  • the traditional internal-combustion engines as those for vehicles, are equipped with several combustion chambers delimited between cylinders and pistons.
  • the cylinders In their lower part the cylinders are open toward a crankcase in which various mechanical parts are present, such as the connecting rod and the crankshaft.
  • the pistons separate the combustion chamber from the crankcase.
  • the lubricant circulates within the crankcase and collects in a provided sump at the bottom, from where it is sucked by a provided pump and sent to the provided pipes in order to lubricate the different components.
  • crankcase is usually provided with a breather system, which may comprise a valve.
  • a breather system which may comprise a valve.
  • Separation systems, such as filters of different types, of the oil entrained by the blow-by gases are usually included.
  • the blow-by gases may be recirculated in the intake line of the engine and assure the combustion of possible unburnt or evaporated fuel or of residues of lubricating oil.
  • a particularly felt problem is the dilution of the lubricating oil by the fuel.
  • the breather contributes to solve the problem, given the higher volatility of the fuel.
  • the percentage of fuel that is present in the lubricating oil may reach considerable values, even around 5%, above all in diesel engines.
  • Some of the factors that cause this phenomenon are the high pressure in the combustion chambers and the lower volatility of the fuel.
  • new and widespread injection techniques complicate the problem. It is the case of the fuel fractionation that improves the quality of the exhaust gases, or of the fuel injection after the combustion stage, in order to have some fuel in the exhaust gases that is used to heat the exhaust gases or to create a reducing mixture for gas treating devices on the exhaust line.
  • the composition of the lubricant has to be monitored in order to understand when it is necessary to change it, and in order to detect faults or malfunctions of the engine that cause an excessive dilution of lubricant. It is clear that a periodic oil change may be insufficient, especially in case of malfunction.
  • a known method is based on the measuring of the level of the lubricant. In this method, however, it is necessary to compare earlier and more recent data. Therefore this method is not suitable for immediate detecting systems, in particular on-board systems, and even the workshop tests take a lot of time.
  • the evaluation of the dilution of the lubricant is still awkward and expensive, its immediate detection is difficult or impossible with on-board systems, in case of vehicles, and even the detection during the workshop tests is problematic. It would be preferable a reliable and rapid detection system which might be applied to the engine during the routine or extraordinary maintenance. It would also be preferable a system that detects easily even a small quantity of fuel. Moreover, it would be preferable an integrated detection system, being able to work during the ordinary functioning of the engine. In case of vehicles, this means that it would be preferable an on-board detection system.
  • the gases are withdrawn from a breather line of said crankcase.
  • the detection takes place on said breather line or on the gases withdrawn from said line before the connection with the intake line. It is possible that the detection takes place on gases present or withdrawn from a position upstream or downstream of a separation system of the lubricant from the blow-by gas. According to an alternative embodiment, the detection takes place on the intake line or on gases withdrawn from the intake line after the introduction of the blow-by gas. It is also possible to make the measurement directly in the crankcase, by means of a duly placed sensor.
  • the invention relates also to a detection system with the function to realize the method described above and an engine equipped with said system.
  • figure 1 shows the diagram of an engine provided with breather line from the crankcase, connected to the air intake line according to this invention.
  • Figure 1 represents an engine in outline, such as a diesel engine for vehicles, which is suitable for the application of the method according to this invention.
  • the method according to this invention may also be applied to other types of internal-combustion engines, even though diesel engines are its preferred application field, for the reasons mentioned above.
  • the engine 1 has an air intake line 2 and a breather line 3 of the crankcase.
  • the breather line may connect, as usual, the crankcase with the intake line, for example at a point upstream of the high-boost turbocharger 4, if present.
  • the breather line may include, as usual, different types of devices 5, such as separation devices, that may consist of different types of filters, inertial separator or others, in order to separate the oil entrained by the gaseous stream and to reintroduce it into the crankcase.
  • a duly calibrated sensor 6 for the detection of hydrocarbons is used to measure the quantity of hydrocarbons present in the blow-by gases of the crankcase.
  • the gas may be withdrawn at an appropriate point and sent to an appropriate measuring device comprising the sensor.
  • the sensor may be placed in an appropriate point of the engine, for example in the breather line (point A or A'), upstream or downstream of a separation device 5 of the lubricant drops, or in the intake line, downstream of the introduction point (point B). This measurements may also be carried out by external devices during the routine maintenance.
  • the senor may be placed in an appropriate point of the engine, in order to obtain an on-board detection system.
  • the sensor may be of the appropriate type, different type of sensors are used, for example, for the evaluation of the presence of hydrocarbons in the exhaust gases. Other sensors are of the type used for the detection of gaseous hydrocarbons, for example in alarm systems. Also the physical principle of the sensor may be of any of the appropriate known type, for example sensors based on the capacity of the gas to remove heat, such as those based on the MMOS (mixed metal oxide semiconductor). The sensor, of course, has to be able to bear the conditions of the blow-by gases (temperature, presence of nebulized oil and other pollutants, such as soot). The person skilled in the art is able to determine which type of sensor is the most appropriate and to carry out an adequate calibration.
  • the method according to this invention allows an immediate and reliable evaluation of the dilution of the lubricant by the fuel.
  • the reliability of the method is higher than the known methods, even in case of low dilution values, when other methods have proved to be totally inadequate.
  • the HC presence has been detected by means of a sensor both at the beginning of the test, and at the time indicated for the various tests, when the amount of fuel in the oil was lower as a result of the evaporation.
  • the considerable sensibility of the detection in every operative condition of the engine is evident, even with low dilution values.
  • the sensor was placed on the breather line of the crankcase, in an appropriate position.
  • This invention also relates to an engine, preferably a diesel engine and in particular a diesel engine for vehicles, equipped with a sensor for the detection of hydrocarbons in the blow-by gases of the crankcase, and to a vehicle, in particular an industrial vehicle equipped with said engine.
  • an engine preferably a diesel engine and in particular a diesel engine for vehicles, equipped with a sensor for the detection of hydrocarbons in the blow-by gases of the crankcase, and to a vehicle, in particular an industrial vehicle equipped with said engine.
  • the senor sends the data to a control unit of the vehicle, that has the function to process and possibly to compare the data with a reference value.
  • the processed data may be displayed by means of provided indicators, both for the alarm activation and the regeneration systems, if present.
  • said system may be equipped with a control unit with the function to receive the data from the HC sensor, and possibly from other sensors, and to process them in order to evaluate the dilution of the lubricant, according to predetermined methods.
  • the invention also relates to a computer software, as such control unit with the function to carry out the evaluation described above can be considered .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP07122384A 2007-12-05 2007-12-05 Procédé et système de détection de la dilution du lubrifiant par le carburant Active EP2067946B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP07122384A EP2067946B1 (fr) 2007-12-05 2007-12-05 Procédé et système de détection de la dilution du lubrifiant par le carburant
ES07122384T ES2390597T3 (es) 2007-12-05 2007-12-05 Procedimiento y sistema para detectar la dilución del lubricante por el combustible
AU2008249218A AU2008249218B2 (en) 2007-12-05 2008-11-26 Method and system for detecting the dilution of the lubricant by the fuel
CN2008101836693A CN101451987B (zh) 2007-12-05 2008-12-04 由燃料造成的润滑剂稀释的探测方法和***
BRPI0822412A BRPI0822412B8 (pt) 2007-12-05 2008-12-05 método e sistema de detecção de diluição do lubrificante do motor pelo combustível

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07122384A EP2067946B1 (fr) 2007-12-05 2007-12-05 Procédé et système de détection de la dilution du lubrifiant par le carburant

Publications (2)

Publication Number Publication Date
EP2067946A1 true EP2067946A1 (fr) 2009-06-10
EP2067946B1 EP2067946B1 (fr) 2012-07-11

Family

ID=39462089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07122384A Active EP2067946B1 (fr) 2007-12-05 2007-12-05 Procédé et système de détection de la dilution du lubrifiant par le carburant

Country Status (5)

Country Link
EP (1) EP2067946B1 (fr)
CN (1) CN101451987B (fr)
AU (1) AU2008249218B2 (fr)
BR (1) BRPI0822412B8 (fr)
ES (1) ES2390597T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2636088B1 (es) * 2016-06-16 2018-06-08 Hassan Rida ALSAYADI ALMASARANI Procedimiento para la previsión, control y reparación de gripaje de cojinetes de cabeza de bielas en motores de gas.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10317936A (ja) 1997-05-21 1998-12-02 Nippon Soken Inc オイルの希釈を抑制する手段を備えた内燃機関
FR2862087A1 (fr) * 2003-11-10 2005-05-13 Renault Sas Procede de commande pour la regeneration d'un filtre a particules
EP1586752A1 (fr) * 2004-04-14 2005-10-19 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Dispositif et méthode pour contrôler la dilution de l'huile dans un moteur à combustion interne
FR2890411A1 (fr) * 2005-09-05 2007-03-09 Peugeot Citroen Automobiles Sa Systeme de determination du taux de dilution de l'huile de lubrification d'un moteur thermique de vehicule automobile par du carburant d'alimentation de celui-ci

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6844745B1 (en) * 2003-09-15 2005-01-18 Eaton Corporation Method of determining the fluid condition of diesel engine lubricant during real time operation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10317936A (ja) 1997-05-21 1998-12-02 Nippon Soken Inc オイルの希釈を抑制する手段を備えた内燃機関
FR2862087A1 (fr) * 2003-11-10 2005-05-13 Renault Sas Procede de commande pour la regeneration d'un filtre a particules
EP1586752A1 (fr) * 2004-04-14 2005-10-19 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Dispositif et méthode pour contrôler la dilution de l'huile dans un moteur à combustion interne
FR2890411A1 (fr) * 2005-09-05 2007-03-09 Peugeot Citroen Automobiles Sa Systeme de determination du taux de dilution de l'huile de lubrification d'un moteur thermique de vehicule automobile par du carburant d'alimentation de celui-ci

Also Published As

Publication number Publication date
ES2390597T3 (es) 2012-11-14
BRPI0822412B8 (pt) 2020-02-18
AU2008249218B2 (en) 2013-05-16
CN101451987A (zh) 2009-06-10
AU2008249218A1 (en) 2009-06-25
EP2067946B1 (fr) 2012-07-11
BRPI0822412A2 (pt) 2013-12-10
CN101451987B (zh) 2013-07-17
BRPI0822412B1 (pt) 2019-02-19

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