EP1726793A2 - Vorrichtung zur Verminderung der Kraftstoffmenge in Öl einer Brennkraftmaschine - Google Patents
Vorrichtung zur Verminderung der Kraftstoffmenge in Öl einer Brennkraftmaschine Download PDFInfo
- Publication number
- EP1726793A2 EP1726793A2 EP06300492A EP06300492A EP1726793A2 EP 1726793 A2 EP1726793 A2 EP 1726793A2 EP 06300492 A EP06300492 A EP 06300492A EP 06300492 A EP06300492 A EP 06300492A EP 1726793 A2 EP1726793 A2 EP 1726793A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil
- engine
- porous membrane
- diesel
- lubricating oil
- 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
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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
- F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
-
- 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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
Definitions
- the present invention relates to a system for reducing the amount of diesel fuel in the lubricating oil of a motor vehicle diesel engine.
- the invention relates to such a diesel engine whose exhaust line is provided with depollution means associated with regeneration means implementing fuel post-injections in the cylinders thereof and wherein the engine is also associated with an oil tank and a diesel / oil separation condenser provided with means of evacuation of diesel vapors.
- motor vehicle diesel engines are associated with means for treating their polluting emissions, these treatment means comprising, for example, NOx traps, particulate filters, oxidation catalysts, etc.
- exhaust gas pollution control systems comprising means of NOx trap type are currently very promising.
- one or more diesel injections are used in the combustion chambers of the engine. This results in almost total consumption of the oxygen in the exhaust gas, thus making it possible to increase the richness of these exhaust gases passing through the trap, beyond 1, but also a gradual dilution of the lubricating oil. engine with diesel.
- This phenomenon of dilution of the lubricating oil is essentially due to the late phasing of the post-injection or post-injections to be used, to pass in richness greater than 1, and the condensation of gas oil in the gas phase on the cylinder walls.
- the diesel jets then reach the walls of the combustion chambers and dilute the film of oil present thereon.
- the resulting oil / diesel mixture then easily passes through the sealing segmentation of the pistons and thus reaches the engine oil tank.
- This dilution phenomenon is similar to that which is the consequence of the engine control strategies implemented to allow for example the regeneration of particulate filters, since post-injection is also required to heat the exhaust gases to a level of temperature sufficient to achieve the combustion temperature of the carbon soot retained on such a particulate filter.
- the dilution rate measured on serial applications in vehicles is generally between 4 and 6%.
- a motor vehicle engine comprising a particulate filter and a NOx post-treatment system is therefore highly subject to the phenomenon of dilution of its lubricating oil, because of the high NOx purge frequency that it is necessary to put (in relation to the regeneration frequencies of a particulate filter), to maintain the NOx conversion efficiency of the catalyst (on average one purge every 1 to 3 minutes) and the need to add purge phases sulphates.
- the purge frequencies are less important than those of the regeneration of the particulate filter, but the post-injection levels must both make it possible to mount the exhaust gases at a high temperature (above 650 ° C.) and with a wealth greater than 1.
- the object of the invention is to solve these problems.
- the invention is based on the observation that these problems, in particular the drop in the viscosity of the lubricating oil, can be solved by removing the molecules of small bulk from the oil.
- the subject of the invention is therefore a system for reducing the amount of diesel fuel in the lubricating oil of a motor vehicle diesel engine, whose exhaust line is provided with depollution means associated with regeneration means in the case of fuel injections into the cylinders thereof and in which the engine is also associated with an oil tank and a diesel / oil separation condenser provided with means for evacuating the diesel fuel vapors, characterized in that it comprises selective separation means for removing volatile linear hydrocarbons from the lubricating oil.
- volatile linear hydrocarbons denotes saturated or unsaturated aliphatic hydrocarbons generally comprising less than 25 and preferably 10 to 20 carbon atoms. These species are small and therefore are the lightest components of diesel. They therefore contribute the most to modify the properties of the lubricating oil, particularly in terms of viscosity.
- the separation means will be chosen so that, in addition to the desired selectivity, they also have sufficient permeability.
- Suitable means of separation include porous membranes, also known as molecular sieves, which are capable of separating molecules on the basis of their size and molecular form.
- porous membranes will be chosen from an oil-inert material that is robust to sintering.
- an oil-inert material that is robust to sintering.
- Porous membranes can consist of a single or several materials, in which case they are called composite membranes.
- porous membranes are known, in particular porous membranes of the carbon, glass, ceramic and zeolite type.
- Carbon membranes are generally prepared by decomposing a polymeric organic compound that produces a carbonaceous layer having a porous structure. Carbon granules have been used commercially for many years for adsorptive molecular separation. However, these membranes have limited resistance to oxidizing atmospheres.
- Porous glass membranes can be prepared with pore diameters of 3 to 300 nm, for example by the Vycor® process. Although the thermal resistance of porous glass is no longer ensured beyond 575 K, it can be used in the present system, the average temperature of the oil being 285K.
- the ceramic membranes are essentially composed of metal oxides such as SiO 2 , Al 2 O 3 , ZrO 2 , TiO 2 , CaO. They are generally asymmetrical systems comprising a macroporous and mesoporous multilayer support ensuring the mechanical strength of the assembly, which carries a thin microporous or mesoporous layer. This thin layer is the membrane that will control virtually the transfer of material. In general, the thin layer is obtained by sol-gel type processes, the pores then being formed by intergranular voids.
- Zeolite-based membranes can also be used. Zeolites are hydrated aluminosilicates containing alkali or alkaline earth ions.
- the crystalline structure of dehydrated zeolites comprises channels whose diameter is in the range of micropores or ultramicropores (pore diameter ⁇ 0.7 nm). The pore diameter distribution is narrow, which makes these membranes more selective and therefore particularly attractive for the described application.
- the selectivity of the porous membranes results essentially from their porosity and their chemical affinity.
- porous membranes In fact, apart from convection, material transfers through porous membranes obey the laws of diffusion of gases in porous media. They therefore strongly depend on the shape, size and pore distribution at the membrane texture.
- macroporous membranes pore diameter> 50 nm
- mesoporous pore diameter 2 to 50 nm
- microporous membranes pore diameter ⁇ 2 nm
- the molecules from diesel that most affect the viscosity of the lubricating oil are unbranched linear molecules having an atomic chain of less than 20 carbon atoms. These molecules can be selectively retained in microporous membranes, preferably having an internal pore diameter of less than 0.5 nm, and in particular less than 0.4 nm.
- the pore inlet diameter of a material can be reduced, if necessary, by grafting the membrane with bulky molecules, such as chloroisopentane. These molecules block by their conformation a part of the pores causing a decrease in the input diameter of the molecules.
- a surface of the membrane can be treated to modify its molecular affinity, in particular its polarity.
- Such a treatment may be advantageous in the present system in that it allows for example to prevent the passage of aromatic molecules.
- the shape and size of the porous membrane can be adapted by known techniques to the diameter of the lubricating oil circulation pipes.
- the porous membrane is preferably associated with a particle filtering means.
- a particle filtering means it is possible for example to have upstream of the porous membrane one or more traps for submicron particles 21.
- the separation means do not interfere with the operation of the diesel engine.
- the composition of the lubricating oil is not impaired, especially as regards the additives.
- the system advantageously eliminates selectively compounds from diesel without affecting the presence of other compounds in the lubricating oil.
- FIG. 1 shows a motorization system of the state of the art, which comprises a motor designated by the general reference 1, which, in the example described, is a four-cylinder diesel engine.
- the exhaust outlet 2 of this engine is associated with the turbine portion 3 of a turbocharger 4 integrated in an exhaust line 5 of this engine, this exhaust line being provided with pollution control means 6 comprising for example a NOx 7 catalyst associated with a particulate filter 8.
- the compressor portion 9 of the turbocharger 4 is associated at the input with an air filter, for example 10, and at the output at an intake air cooler designated by the general reference 11, the output of which is connected to an air intake manifold. intake of gases at the engine inlet and designated by the general reference 12.
- the exhaust outlet of the engine 2 is also associated with a recirculation EGR circuit designated by the general reference 13, comprising an EGR valve designated by the general reference 14, optionally an EGR oxidation catalyst designated by the general reference 15 and a EGR cooler designated by the general reference 16, the output of which is also connected to the intake manifold 12.
- a recirculation EGR circuit designated by the general reference 13 comprising an EGR valve designated by the general reference 14, optionally an EGR oxidation catalyst designated by the general reference 15 and a EGR cooler designated by the general reference 16, the output of which is also connected to the intake manifold 12.
- the engine is also associated with a lubricating oil tank designated by the general reference 17 in this figure and a diesel fuel / oil separation condenser 18 provided with means for evacuation of diesel vapors, such as for example a conduit 19 for recirculating these vapors in the engine and an oil filter 20.
- a diesel fuel / oil separation condenser 18 provided with means for evacuation of diesel vapors, such as for example a conduit 19 for recirculating these vapors in the engine and an oil filter 20.
- the lubricating oils consist of heavy hydrocarbons whose distillation temperatures are generally between 340 and 500 ° C. They also contain specific additives whose role is to enhance its antioxidant properties, maintain or increase its viscosity, etc ..., and whose vaporization temperatures are generally located above 380 ° C.
- these separation means may be a porous membrane 22, advantageously associated with one or more traps for submicron particles 21 situated upstream, making it possible to extend the operating time of the membrane.
- the engine 1, the turbocharger 4, the exhaust line 5, the depollution means 6, the EGR circuit 13, the oil tank 17, the condenser 18 and the combustion means are recognized. evacuation 19.
- the porous membrane 22 may be of the type described above. Preferably, it is a porous membrane of zeolite type also called molecular sieve.
- the lubricating oil then passes from the condenser 19 through the oil filter 20, and the trap (s) for submicron particles 21 before reaching the porous membrane 22.
- Molecules having a size smaller than the pore admission size are preferentially adsorbed in the porous membrane.
- a porous membrane having an inlet size of 0.5 nm can adsorb molecules smaller than 0.5 nm. The adsorbed molecules can then migrate along the porous system of the porous membrane.
- the porous membrane is formed and arranged in such a way that the molecules thus adsorbed can be easily removed from the oil circuit.
- FIG. 3 Such an embodiment is illustrated in FIG. 3.
- the porous membrane 22 is arranged in such a way that one of its surfaces is in contact with the oil circuit and another with the intake air circulating in the connecting duct. the outlet of the EGR cooler 16.
- the two surfaces of the porous membrane are connected by pores.
- the adsorbed molecules are then aspirated through the porous membrane system through the intake air. They then migrate through the porous membrane to be driven by intake air entering or leaving the intake manifold (common rail system) (12).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0505042A FR2885950B1 (fr) | 2005-05-19 | 2005-05-19 | Systeme de reduction de la quantite de gazole dans l'huile de lubrification d'un moteur |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1726793A2 true EP1726793A2 (de) | 2006-11-29 |
| EP1726793A3 EP1726793A3 (de) | 2007-08-08 |
| EP1726793B1 EP1726793B1 (de) | 2009-10-14 |
Family
ID=35033657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06300492A Not-in-force EP1726793B1 (de) | 2005-05-19 | 2006-05-18 | Vorrichtung zur Verminderung der Kraftstoffmenge im Öl einer Brennkraftmaschine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1726793B1 (de) |
| AT (1) | ATE445764T1 (de) |
| DE (1) | DE602006009722D1 (de) |
| FR (1) | FR2885950B1 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009000879A1 (en) * | 2007-06-26 | 2008-12-31 | Josef Lenz | Internal combustion engine with reduced fuel content in the lubricating oil |
| CN103573415B (zh) * | 2013-11-18 | 2016-04-20 | 中国南方航空工业(集团)有限公司 | 一种滑油滤清与燃滑油换热的组合装置及其换热方法 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2906299B1 (fr) * | 2006-09-22 | 2009-05-15 | Peugeot Citroen Automobiles Sa | Systeme de reduction de la quantite de gazole dans l'huile de lubrification d'un moteur |
| CN111502796B (zh) * | 2020-04-21 | 2021-05-18 | 李斯特技术中心（上海）有限公司 | 一种高效清洁温控汽油机机油分离*** |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6355316A (ja) * | 1986-08-22 | 1988-03-09 | Mazda Motor Corp | アルコ−ルエンジンの潤滑装置 |
| US6053143A (en) * | 1998-05-26 | 2000-04-25 | 709398 Ontario Ltd. | Method of improving combustion efficiency and reducing exhaust emissions by controlling oil volatility in internal combustion engines |
| FR2803624A1 (fr) * | 2000-01-06 | 2001-07-13 | Peugeot Citroen Automobiles Sa | Procede de lubrification des organes mecaniques d'un moteur diesel de vehicule et dispositif de lubrification de mise en oeuvre du procede |
| DE10128464A1 (de) * | 2001-06-12 | 2002-12-19 | Porsche Ag | Brennkraftmaschine |
| US20030121491A1 (en) * | 2001-08-15 | 2003-07-03 | Brown William L. | Method and system for extending engine oil life |
| US20040139734A1 (en) * | 2002-08-23 | 2004-07-22 | Schmeichel Steve D. | Apparatus for emissions control, system, and methods |
| DE10318784A1 (de) * | 2003-04-25 | 2004-11-11 | Audi Ag | Verfahren zum Betreiben einer Brennkraftmaschine |
-
2005
- 2005-05-19 FR FR0505042A patent/FR2885950B1/fr not_active Expired - Fee Related
-
2006
- 2006-05-18 DE DE602006009722T patent/DE602006009722D1/de active Active
- 2006-05-18 EP EP06300492A patent/EP1726793B1/de not_active Not-in-force
- 2006-05-18 AT AT06300492T patent/ATE445764T1/de not_active IP Right Cessation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6355316A (ja) * | 1986-08-22 | 1988-03-09 | Mazda Motor Corp | アルコ−ルエンジンの潤滑装置 |
| US6053143A (en) * | 1998-05-26 | 2000-04-25 | 709398 Ontario Ltd. | Method of improving combustion efficiency and reducing exhaust emissions by controlling oil volatility in internal combustion engines |
| FR2803624A1 (fr) * | 2000-01-06 | 2001-07-13 | Peugeot Citroen Automobiles Sa | Procede de lubrification des organes mecaniques d'un moteur diesel de vehicule et dispositif de lubrification de mise en oeuvre du procede |
| DE10128464A1 (de) * | 2001-06-12 | 2002-12-19 | Porsche Ag | Brennkraftmaschine |
| US20030121491A1 (en) * | 2001-08-15 | 2003-07-03 | Brown William L. | Method and system for extending engine oil life |
| US20040139734A1 (en) * | 2002-08-23 | 2004-07-22 | Schmeichel Steve D. | Apparatus for emissions control, system, and methods |
| DE10318784A1 (de) * | 2003-04-25 | 2004-11-11 | Audi Ag | Verfahren zum Betreiben einer Brennkraftmaschine |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 012, no. 272 (M-724), 28 juillet 1988 (1988-07-28) & JP 63 055316 A (MAZDA MOTOR CORP), 9 mars 1988 (1988-03-09) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009000879A1 (en) * | 2007-06-26 | 2008-12-31 | Josef Lenz | Internal combustion engine with reduced fuel content in the lubricating oil |
| CN103573415B (zh) * | 2013-11-18 | 2016-04-20 | 中国南方航空工业(集团)有限公司 | 一种滑油滤清与燃滑油换热的组合装置及其换热方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2885950B1 (fr) | 2007-08-17 |
| FR2885950A1 (fr) | 2006-11-24 |
| EP1726793A3 (de) | 2007-08-08 |
| DE602006009722D1 (de) | 2009-11-26 |
| EP1726793B1 (de) | 2009-10-14 |
| ATE445764T1 (de) | 2009-10-15 |
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