EP4051884A1 - Emission treatment system for an internal combustion engine - Google Patents
Emission treatment system for an internal combustion engineInfo
- Publication number
- EP4051884A1 EP4051884A1 EP19798017.0A EP19798017A EP4051884A1 EP 4051884 A1 EP4051884 A1 EP 4051884A1 EP 19798017 A EP19798017 A EP 19798017A EP 4051884 A1 EP4051884 A1 EP 4051884A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- internal combustion
- combustion engine
- treatment system
- emission treatment
- oil separator
- 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 37
- 238000009423 ventilation Methods 0.000 claims abstract description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 38
- 238000011010 flushing procedure Methods 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 45
- 239000007789 gas Substances 0.000 description 22
- 239000000446 fuel Substances 0.000 description 19
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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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
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
-
- 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
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
-
- 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
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/089—Layout of the fuel vapour installation
-
- 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
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0422—Separating oil and gas with a centrifuge device
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the invention relates to an emissions treatment system for an internal combustion engine with a crankcase, a tank, a crankcase ventilation line, a tank ventilation line and an oil separator into which the crankcase ventilation line opens.
- the blow-by gases contain oil, so that oil separators are used here, with which the oil is separated from the gaseous parts of the blow-by gas and returned to the oil pan, while the other gases are fed to the intake manifold for subsequent combustion.
- Plate separators are often used as oil separators in motor vehicles, in which the centrifugal forces between the plates cause the heavier oil particles are thrown outwards and can be discharged, while the lighter gas is discharged upwards from the plate separators.
- An emissions treatment system has become known from EP 0 846 847 A1 in which the blow-by gas passes into an oil separator, from which the gas passes on to a conveying apparatus which is also used to convey the fuel vapor from an activated carbon filter.
- the disadvantage of these legally prescribed systems is that these additional components increase the manufacturing costs for the automobile manufacturer.
- the weight of the vehicles increases, which in turn leads to increased emissions.
- the object is therefore to provide an emissions treatment system for an internal combustion engine which is more simply constructed so that the weight and the number of components required can be reduced and thus costs and emissions are reduced. This object is achieved by an emissions treatment system for an internal combustion engine with the features of main claim 1.
- the emission treatment system according to the invention for an internal combustion engine accordingly has a crankcase from which blow-by gases can be discharged via a crankcase ventilation line, and a tank from which the fuel vapors can be discharged via a tank ventilation line.
- the crankcase line opens into an oil separator, into which, according to the invention, the tank ventilation line also opens, so that the fuel vapor is guided over the oil separator.
- This is designed in such a way that a pressure difference can be generated by it which is sufficient to discharge the fuel vapor or an activated carbon filter to regenerate.
- a separate scavenging pump for conveying the fuel vapor can be dispensed with. The manufacturing costs and the weight and thus also the emissions can be reduced by reducing the number of components.
- the oil separator is preferably designed as a plate separator.
- a plate separator generates a negative pressure of at least 50 mbar and conveys about 80 l / min. This negative pressure and the volume flow generated by it are sufficient to convey the fuel vapor and to regenerate the activated carbon filter by removing the hydrocarbons from it.
- the plate separator generates a pressure difference of at least 60 mbar, so that suction of the blow-by gases from the crankcase and the fuel vapors from the tank or the hydrocarbons from the activated carbon filter is ensured.
- the plate separator is advantageously driven by an electric motor, since a very precise speed control is possible with an electric motor and the electric motor can be easily integrated into the plate separator.
- the oil separator advantageously has a housing on which two inlets are formed, of which the first inlet is connected to the crankcase ventilation line and the second inlet is connected to the tank ventilation line.
- the two fluid flows are brought together at the oil separator so that no mixing occurs in the lines.
- the tank ventilation duct opens into the crankcase ventilation duct upstream of the oil separator, so that only one inlet on the oil separator is required.
- a first outlet is formed on the housing of the oil separator, which is connected to the inlet channel system of Internal combustion engine is connected and a second outlet is formed, which is connected to the oil pan via an oil return line.
- the gaseous elements from the crankcase and the hydrocarbons or the gaseous portion of the fuel vapors can be fed to the intake manifold and thus to renewed combustion, while the separated oil can be returned to the oil pan. Since only one line is required to connect to the suction pipe, material can also be saved here compared to known designs.
- An activated carbon filter is preferably arranged in the tank ventilation line between the tank and the oil separator, so that the hydrocarbons can be temporarily stored.
- a tank ventilation valve is arranged between the activated charcoal filter and the oil separator, by means of which the regeneration of the activated charcoal filter can be limited to certain times by flushing so that the oil separator is not constantly burdened by the fuel vapors.
- crankcase ventilation valve is used between the crankcase and the oil separator, the two gas flows can also be completely separated in time, so that the oil separator only ever either delivers fuel vapors or separates and delivers blow-by gases. In this way it can be ensured that a sufficient pressure difference can always be made available.
- At least one of the plates of the plate separator has conveyor blades on its surface.
- the pressure difference that can be generated and thus the volume flow to be conveyed can be increased, so that both gas flows can also be conveyed at the same time, and there is no need to fear too little conveyance.
- a particularly good effect is achieved if the plate with the conveyor blades is formed on the axial end of the plate separator facing the at least one inlet, since this creates a particularly good suction effect, which ensures the legally required suction for regeneration of the activated carbon filter.
- an impeller is formed on the shaft of the plate separator. This can be designed as desired, but in particular as a radial impeller, whereby the pressure difference that can be generated and the volume flow associated therewith can also be increased in order to ensure a sufficient suction effect.
- Such an emission treatment system for an internal combustion engine has a correspondingly simple structure, so that components, weight and costs are saved. Nevertheless, the legal requirements for the regeneration of an activated carbon filter and for the extraction of the blow-by gases are met and sufficient pressure gradients are ensured for conveyance.
- FIG. 1 shows a schematic representation of an emissions treatment system according to the invention for an internal combustion engine.
- the emission treatment system according to the invention for an internal combustion engine consists of a crankcase 10 in which pistons 13 are moved up and down in cylinders 12 in a known manner due to the combustion. For this combustion it is necessary to introduce air and fuel into the cylinders 12. The air is sucked in via an air filter 14 and compressed in a compressor 16 of a turbocharger 18. Via a charge air cooler 20 and a throttle valve 22, via which the amount of air supplied is regulated, the air flow reaches an inlet duct system 24, the individual ducts of which open into the cylinders 12 of the crankcase 10 via inlet valves.
- Injection valves 15 are arranged above the cylinders 12 and are connected to a tank 26 of the internal combustion engine via fuel lines 17 and via which fuel can be injected into the cylinders 12 so that an explosive mixture can be generated with the air.
- the moving parts of the internal combustion engine are lubricated with oil to reduce friction, which oil is supplied to the pistons 13 and cylinder liners as well as the connecting rod and crankshaft bearings by means of an oil pump 28 from an oil pan 30 arranged under the crankcase 10.
- crankcase 10 During the combustion and through the lubrication, a gas-oil mixture is created in the crankcase 10, which is referred to as blow-by gas and has to be purposefully discharged from the crankcase 10 to prevent it from escaping into the environment in order to comply with the statutory emission guidelines.
- a crankcase ventilation line 32 leads from the interior of the crankcase 10 to the outside.
- a crankcase ventilation valve 34 is arranged, via which the crankcase ventilation line 32 can be released or shut off.
- the crankcase ventilation line 32 opens via a first inlet 36 into an oil separator 38, which in the present exemplary embodiment is designed as a plate separator, the inlet of which is designed in a central area of a base 39 of a housing 40 of the oil separator 38.
- the superimposed plates 42 des Disk separators are attached to a shaft 44 which is driven by an electric motor 46. As a result of the rotation of the plate 42, a centrifugal force acts on the blow-by gas.
- the centrifugal force is directly proportional to the mass, the heavy oil droplets contained in the blow-by gas are accelerated outward and thrown over the plates 42 to a radially delimiting wall 48 of the housing 40, from where they flow to the bottom 39 by gravity.
- the lighter gas is conveyed through the pressure difference between the first inlet 36 and a first outlet 50 in the upper area of the housing 40 of the oil separator 38 due to the rotation of the plate 42 and the negative pressure in the inlet channel system to the first outlet 50, which is connected to the via an outlet line 52 Inlet duct system 24 is connected. This gas is accordingly fed to the combustion in the cylinder 12.
- the oil passes through a drain opening formed in the bottom 39 of the oil separator 38 and serving as a second outlet 54 into an oil return line 56 which opens into the oil pan 30 so that the oil is again made available for lubrication.
- the plate separator 38 is also used to flush an activated carbon filter 58 by forming a second inlet 60 on the plate separator 38, via which fuel vapor is conveyed from the activated carbon filter 58 into the plate separator 38 via a tank ventilation line 62.
- a tank ventilation valve 64 is arranged between the activated carbon filter 58 and the oil separator 38, via which the connection can be interrupted.
- a separate impeller 66 can be arranged on the shaft 44 of the plate separator 38, for example, or one of the plates 42, in particular the lower plate 42, can be equipped with conveyor blades 68 to increase the pressure difference.
- the oil separator acts either as a flushing pump for the activated carbon filter or as a pure oil separator for the blow-by gas. Both can either be fed together or individually in any sequence to the inlet duct system and thus to a new combustion. An additional flushing pump for conveying the fuel vapors can therefore be omitted, so that costs can be reduced by reducing the number of components and the emission regulations can still be complied with.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2019/079414 WO2021083485A1 (en) | 2019-10-28 | 2019-10-28 | Emission treatment system for an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4051884A1 true EP4051884A1 (en) | 2022-09-07 |
Family
ID=68461756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19798017.0A Withdrawn EP4051884A1 (en) | 2019-10-28 | 2019-10-28 | Emission treatment system for an internal combustion engine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP4051884A1 (en) |
WO (1) | WO2021083485A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997044581A1 (en) | 1996-12-09 | 1997-11-27 | Hideaki Watase | Combustion enhancing apparatus |
JP2017506717A (en) * | 2014-02-21 | 2017-03-09 | ボルボトラックコーポレーション | Method for removing leaked crankcase fluid from crankcase and crankcase ventilation system |
DE102018000836A1 (en) * | 2018-02-02 | 2019-08-08 | Psa Automobiles Sa | Motor vehicle with a ventilation system for oil vapors and fuel vapors |
-
2019
- 2019-10-28 EP EP19798017.0A patent/EP4051884A1/en not_active Withdrawn
- 2019-10-28 WO PCT/EP2019/079414 patent/WO2021083485A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2021083485A1 (en) | 2021-05-06 |
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