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 PDFInfo
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000010790 dilution Methods 0.000 title claims abstract description 21
- 239000012895 dilution Substances 0.000 title claims abstract description 21
- 239000000314 lubricant Substances 0.000 title claims abstract description 21
- 239000000446 fuel Substances 0.000 title claims description 21
- 239000007789 gas Substances 0.000 claims abstract description 37
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 21
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 21
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 description 19
- 238000001514 detection method Methods 0.000 description 16
- 239000003921 oil Substances 0.000 description 14
- 239000010687 lubricating oil Substances 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 229910003455 mixed metal oxide Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Images
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)
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)
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)
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)
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 |
-
2007
- 2007-12-05 ES ES07122384T patent/ES2390597T3/es active Active
- 2007-12-05 EP EP07122384A patent/EP2067946B1/fr active Active
-
2008
- 2008-11-26 AU AU2008249218A patent/AU2008249218B2/en active Active
- 2008-12-04 CN CN2008101836693A patent/CN101451987B/zh active Active
- 2008-12-05 BR BRPI0822412A patent/BRPI0822412B8/pt active IP Right Grant
Patent Citations (4)
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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