US20100139261A1 - Exhaust Gas Filter System - Google Patents
Exhaust Gas Filter System Download PDFInfo
- Publication number
- US20100139261A1 US20100139261A1 US12/466,174 US46617409A US2010139261A1 US 20100139261 A1 US20100139261 A1 US 20100139261A1 US 46617409 A US46617409 A US 46617409A US 2010139261 A1 US2010139261 A1 US 2010139261A1
- Authority
- US
- United States
- Prior art keywords
- coating layer
- exhaust gas
- wash coat
- filter system
- gas filter
- 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.)
- Abandoned
Links
- 239000011247 coating layer Substances 0.000 claims abstract description 40
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 229910000510 noble metal Inorganic materials 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 15
- 239000013618 particulate matter Substances 0.000 description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 4
- 239000004071 soot Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
-
- B01J35/40—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/247—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2474—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the walls along the length of the honeycomb
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2482—Thickness, height, width, length or diameter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
-
- B01J35/19—
-
- B01J35/56—
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
- C04B38/0009—Honeycomb structures characterised by features relating to the cell walls, e.g. wall thickness or distribution of pores in the walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/60—Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
- F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
- F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
Definitions
- the present invention relates to an exhaust gas filter system, and more particularly to an exhaust gas filter system for reducing back pressure of exhaust gas and improving purification efficiency of particulate matter.
- the exhaust system of an engine exhausts exhaust gas to the rear of a vehicle and reduces exhaust noise.
- a catalyst device has been used so as to purify the exhaust gas and transform harmful exhaust gas to harmless carbon dioxide and water.
- the catalyst device reduces hydrocarbons, carbon monoxide, and nitrogen oxide (NOx). Also, the catalyst device filters or burns particulate matter.
- a diesel particulate filter DPF accumulates particulate matter that is generated from a diesel engine and combusts the accumulated matter, and a plurality of channels are formed therein in a flow direction of the exhaust gas.
- the inlet of at least one among the channels is closed and the outlet thereof is opened
- the inlet of at least another one among the channels is closed and the outlet thereof is opened
- the closed portions are alternatively disposed.
- a diesel oxidation catalyst (DOC) and a catalyzed particulate filter (CPF) among catalyst devices are applied to accumulate and to eliminate particulate matter (PM).
- DOC diesel oxidation catalyst
- CPF catalyzed particulate filter
- the filter includes expensive SiC or AT materials, and an asymmetrical filter is used so as to raise accumulation efficiency for accumulating the particulate matter.
- an asymmetrical filter is used so as to raise accumulation efficiency for accumulating the particulate matter.
- the back pressure and the fuel consumption increase.
- Various aspects of the present invention are directed to provide an exhaust gas filter system having advantages of preventing back pressure from being increased, and improving regeneration efficiency.
- an exhaust gas filter system in which an asymmetrical channel, in which the diameter of an inlet being opened is larger than that of an outlet disposed and opened at a rear end surface, is formed may include a first coating layer that is formed at an inner surface of a front portion of the channel by coating a first wash coat, and/or a second coating layer that is formed at an inner surface of a rear portion of the channel by coating a second wash coat, wherein inner cross section of the front portion is wider than inner cross section of the rear portion.
- the thickness of the second coating layer may be equal to or smaller than that of the first coating layer.
- the first coating layer may be formed in the front portion and the second coating layer is formed in the rear portion of the filter on the basis of a center line thereof, wherein the volume of the first wash coat that is used for the first coating layer is approximately twice as large as that of the second wash coat that is used for the second coating layer.
- the weight (grams) of a noble metal that is contained in the first wash coat may be equal to that of the noble metal that is contained in the second wash coat, and the concentration (grams/liter) of the noble metal is varied according to the weight of the noble metal.
- a plurality of channels may be formed in a flow direction of exhaust gas, the inlet of at least one among the channels is opened and the outlet thereof is closed, the inlet of at least another one among the channels is closed and the outlet thereof is opened, and the closed portions of the inlets are alternatively disposed and the closed portions of the outlets are alternatively disposed.
- the front portion of the filter may be soaked in a first wash coat liquid and the rear portion of the filter is soaked in a second wash coat liquid so as to respectively form the first coating layer and the second coating layer, wherein the thickness of the first coating layer is adjusted by controlling the used volume of the first wash coat.
- the thickness of the coating layer of the rear portion is reduced such that back pressure is lowered and regeneration efficiency is improved.
- FIG. 1 is a schematic diagram of an exemplary exhaust gas filter system according to the present invention.
- FIG. 2 is a schematic side view of a filter that is disposed in an exemplary exhaust gas filter system according to the present invention.
- FIG. 3 is a side view showing View A of FIG. 2 .
- FIG. 4 is a side view showing View B of FIG. 2 .
- FIG. 5 is a detailed sectional view of a filter according to line V-V and line VI-VI of FIG. 2 .
- FIG. 6 is a table showing characteristics of wash coat that is applied to a filter.
- FIG. 1 is a schematic diagram of an exhaust gas filter system according to various embodiments of the present invention.
- reference number 100 denotes a diesel engine
- reference number 110 denotes an exhaust pipe
- reference number 120 denotes a diesel catalytic filter (DPF).
- DOC diesel oxidation catalyst
- the diesel catalytic filter 120 accumulates and eliminates particulate matter including soot.
- a catalyzed particulate filter can be applied instead of the diesel catalytic filter 120 .
- FIG. 2 is a schematic side view of a filter that is disposed in an exhaust gas filter system according to various embodiments of the present invention
- FIG. 3 is a side view showing View A of FIG. 2
- FIG. 4 is a side view showing View B of FIG. 2 .
- a filter 200 is disposed to accumulate particulate matter in the diesel catalytic filter 120 , and the filter 200 is divided into a front portion 230 and a rear portion 240 on the basis of a center line 250 thereof. And, a front end surface 210 is formed in the front end of the front portion 230 and a rear end surface 220 is formed in the rear end of the rear portion 240 .
- a plurality of channels 310 through which the exhaust gas passes are formed in a direction from the front end surface 210 to the rear end surface 220 of the filter 200 .
- the channels 310 that are formed in the front end surface 210 are alternatively closed by a first plug 300 and the channels 310 that are formed in the rear end surface 220 are alternatively closed by a second plug 320 .
- the cross-section of the channel 310 of which the inlet thereof is opened and the outlet thereof is closed by the second plug 320 becomes narrower in a length direction of the filter 200 .
- the filter 200 has an asymmetrical structure in which the inlet is larger than the outlet to effectively improve the accumulation amount of the PM and to increase a valid volume thereof such that the filter volume and the production cost can be reduced.
- FIG. 5 is a detailed sectional view of a filter according to line V-V and line IV-IV of FIG. 2 .
- a first coating layer 500 that is formed in the front portion 230 of the filter 200 is formed at an inner surface of the channel 310
- a second coating layer 505 that is formed in the rear portion 240 of the filter 200 is formed at an inner surface of the channel 310 .
- the thickness d 1 of the first coating layer 500 is equal to or greater than the thickness d 2 of the second coating layer 505 such that an increase in back pressure is prevented toward the rear of the filter 200 .
- the back pressure that is formed in the second coating layer is relatively low.
- FIG. 6 is a table showing characteristics of wash coat that is applied to a filter.
- the first wash coat is used to form the first coating layer 500 that is formed in the front portion 230 of the filter 200
- the second wash coat is used to form the second coating layer 505 in the rear portion 240 .
- the used volume of the first wash coat is equal to or larger than that of the second wash coat.
- the used volume of the first wash coat that is used for the wider area and the thickness d 1 of the first coating layer 500 are equal to or greater than the used volume of the second wash coat and the thickness d 2 of the second coating layer 505 . More specifically, the used amount of the first wash coat is twice as large as that of the second wash coat.
- the particulate matter is mainly collected in the rear portion 240 of the filter 200 , and particularly the ash and soot that originate from fuel or oil additives are accumulated there, and if the thickness of the second coating layer 505 is thicker, the back pressure is increased such that the accumulation efficiency is decreased.
- the thickness of the second coating layer 505 is thinner than that of the first coating layer 500 such that the back pressure is relatively decreased, and the regeneration efficiency thereof is improved, even though the ash and soot is normally accumulated in the rear portion.
- the front portion 230 and the rear portion 240 of the filter 200 are alternately dipped into the wash coat liquid so as to coat the inner surface of the channels 310 of the filter 200 , and as the thickness of the wash coat becomes thicker, the diameters of the channels become relatively smaller.
- the thickness of the second coating layer 505 can be thicker, but in various embodiments of the present invention, the thickness of the second coating layer 505 can be adjusted by reducing the first wash coat amount that is used for the second coating layer 505 .
Abstract
An exhaust gas filter system in which an asymmetrical channel, in which the diameter of an inlet being opened is larger than that of an outlet disposed and opened at a rear end surface, is formed, may include a first coating layer that is formed at an inner surface of a front portion of the channel by coating a first wash coat, and a second coating layer that is formed at an inner surface of a rear portion of the channel by coating a second wash coat, wherein inner cross section of the front portion is wider than inner cross section of the rear portion.
Description
- The present application claims priority to Korean Patent Application Number 10-2008-0123525 filed Dec. 5, 2008, the entire contents of which application is incorporated herein for all purposes by this reference.
- 1. Field of the Invention
- The present invention relates to an exhaust gas filter system, and more particularly to an exhaust gas filter system for reducing back pressure of exhaust gas and improving purification efficiency of particulate matter.
- 2. Description of Related Art
- Generally, the exhaust system of an engine exhausts exhaust gas to the rear of a vehicle and reduces exhaust noise.
- Lately, a catalyst device has been used so as to purify the exhaust gas and transform harmful exhaust gas to harmless carbon dioxide and water.
- Particularly, the catalyst device reduces hydrocarbons, carbon monoxide, and nitrogen oxide (NOx). Also, the catalyst device filters or burns particulate matter. Generally, a diesel particulate filter (DPF) accumulates particulate matter that is generated from a diesel engine and combusts the accumulated matter, and a plurality of channels are formed therein in a flow direction of the exhaust gas.
- Further, the inlet of at least one among the channels is closed and the outlet thereof is opened, the inlet of at least another one among the channels is closed and the outlet thereof is opened, and the closed portions are alternatively disposed.
- A diesel oxidation catalyst (DOC) and a catalyzed particulate filter (CPF) among catalyst devices are applied to accumulate and to eliminate particulate matter (PM).
- The filter includes expensive SiC or AT materials, and an asymmetrical filter is used so as to raise accumulation efficiency for accumulating the particulate matter. However, when accumulating the particulate matter, the back pressure and the fuel consumption increase.
- The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
- Various aspects of the present invention are directed to provide an exhaust gas filter system having advantages of preventing back pressure from being increased, and improving regeneration efficiency.
- In an aspect of the present invention, an exhaust gas filter system in which an asymmetrical channel, in which the diameter of an inlet being opened is larger than that of an outlet disposed and opened at a rear end surface, is formed, may include a first coating layer that is formed at an inner surface of a front portion of the channel by coating a first wash coat, and/or a second coating layer that is formed at an inner surface of a rear portion of the channel by coating a second wash coat, wherein inner cross section of the front portion is wider than inner cross section of the rear portion.
- The thickness of the second coating layer may be equal to or smaller than that of the first coating layer.
- The first coating layer may be formed in the front portion and the second coating layer is formed in the rear portion of the filter on the basis of a center line thereof, wherein the volume of the first wash coat that is used for the first coating layer is approximately twice as large as that of the second wash coat that is used for the second coating layer.
- The weight (grams) of a noble metal that is contained in the first wash coat may be equal to that of the noble metal that is contained in the second wash coat, and the concentration (grams/liter) of the noble metal is varied according to the weight of the noble metal.
- In another aspect of the present invention, a plurality of channels may be formed in a flow direction of exhaust gas, the inlet of at least one among the channels is opened and the outlet thereof is closed, the inlet of at least another one among the channels is closed and the outlet thereof is opened, and the closed portions of the inlets are alternatively disposed and the closed portions of the outlets are alternatively disposed.
- The front portion of the filter may be soaked in a first wash coat liquid and the rear portion of the filter is soaked in a second wash coat liquid so as to respectively form the first coating layer and the second coating layer, wherein the thickness of the first coating layer is adjusted by controlling the used volume of the first wash coat.
- As described above, in various aspects of the present invention, the thickness of the coating layer of the rear portion is reduced such that back pressure is lowered and regeneration efficiency is improved.
- The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description of the Invention, which together serve to explain certain principles of the present invention.
-
FIG. 1 is a schematic diagram of an exemplary exhaust gas filter system according to the present invention. -
FIG. 2 is a schematic side view of a filter that is disposed in an exemplary exhaust gas filter system according to the present invention. -
FIG. 3 is a side view showing View A ofFIG. 2 . -
FIG. 4 is a side view showing View B ofFIG. 2 . -
FIG. 5 is a detailed sectional view of a filter according to line V-V and line VI-VI ofFIG. 2 . -
FIG. 6 is a table showing characteristics of wash coat that is applied to a filter. - Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.
-
FIG. 1 is a schematic diagram of an exhaust gas filter system according to various embodiments of the present invention. - Referring to
FIG. 1 ,reference number 100 denotes a diesel engine,reference number 110 denotes an exhaust pipe, andreference number 120 denotes a diesel catalytic filter (DPF). And DOC (diesel oxidation catalyst) is disposed in upstream side of theDPF 120. - The diesel
catalytic filter 120 accumulates and eliminates particulate matter including soot. - In various embodiments of the present invention, a catalyzed particulate filter (CPF) can be applied instead of the diesel
catalytic filter 120. -
FIG. 2 is a schematic side view of a filter that is disposed in an exhaust gas filter system according to various embodiments of the present invention,FIG. 3 is a side view showing View A ofFIG. 2 , andFIG. 4 is a side view showing View B ofFIG. 2 . - Referring to
FIG. 2 , afilter 200 is disposed to accumulate particulate matter in the dieselcatalytic filter 120, and thefilter 200 is divided into afront portion 230 and arear portion 240 on the basis of acenter line 250 thereof. And, afront end surface 210 is formed in the front end of thefront portion 230 and arear end surface 220 is formed in the rear end of therear portion 240. - Referring to
FIG. 3 andFIG. 4 , a plurality ofchannels 310 through which the exhaust gas passes are formed in a direction from thefront end surface 210 to therear end surface 220 of thefilter 200. - The
channels 310 that are formed in thefront end surface 210 are alternatively closed by afirst plug 300 and thechannels 310 that are formed in therear end surface 220 are alternatively closed by asecond plug 320. - More specifically, the cross-section of the
channel 310 of which the inlet thereof is opened and the outlet thereof is closed by thesecond plug 320 becomes narrower in a length direction of thefilter 200. - In contrast, the inlet thereof is closed by the
first plug 300 and the outlet thereof is opened. - As described above, the
filter 200 has an asymmetrical structure in which the inlet is larger than the outlet to effectively improve the accumulation amount of the PM and to increase a valid volume thereof such that the filter volume and the production cost can be reduced. -
FIG. 5 is a detailed sectional view of a filter according to line V-V and line IV-IV ofFIG. 2 . - Referring to
FIG. 5 , afirst coating layer 500 that is formed in thefront portion 230 of thefilter 200 is formed at an inner surface of thechannel 310, and a second coating layer 505 that is formed in therear portion 240 of thefilter 200 is formed at an inner surface of thechannel 310. - The thickness d1 of the
first coating layer 500 is equal to or greater than the thickness d2 of the second coating layer 505 such that an increase in back pressure is prevented toward the rear of thefilter 200. - That is, although ash and soot are accumulated in the rear portion, the back pressure that is formed in the second coating layer is relatively low.
-
FIG. 6 is a table showing characteristics of wash coat that is applied to a filter. - Referring to
FIG. 6 , the first wash coat is used to form thefirst coating layer 500 that is formed in thefront portion 230 of thefilter 200, and the second wash coat is used to form the second coating layer 505 in therear portion 240. - In various embodiments of the present invention, the used volume of the first wash coat is equal to or larger than that of the second wash coat.
- As described above, the used volume of the first wash coat that is used for the wider area and the thickness d1 of the
first coating layer 500 are equal to or greater than the used volume of the second wash coat and the thickness d2 of the second coating layer 505. More specifically, the used amount of the first wash coat is twice as large as that of the second wash coat. - The particulate matter is mainly collected in the
rear portion 240 of thefilter 200, and particularly the ash and soot that originate from fuel or oil additives are accumulated there, and if the thickness of the second coating layer 505 is thicker, the back pressure is increased such that the accumulation efficiency is decreased. - However, in various embodiments of the present invention, the thickness of the second coating layer 505 is thinner than that of the
first coating layer 500 such that the back pressure is relatively decreased, and the regeneration efficiency thereof is improved, even though the ash and soot is normally accumulated in the rear portion. - The
front portion 230 and therear portion 240 of thefilter 200 are alternately dipped into the wash coat liquid so as to coat the inner surface of thechannels 310 of thefilter 200, and as the thickness of the wash coat becomes thicker, the diameters of the channels become relatively smaller. - In this case, the thickness of the second coating layer 505 can be thicker, but in various embodiments of the present invention, the thickness of the second coating layer 505 can be adjusted by reducing the first wash coat amount that is used for the second coating layer 505.
- For convenience in explanation and accurate definition in the appended claims, the terms “front” and “rear” are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures.
- The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.
Claims (9)
1. An exhaust gas filter system in which an asymmetrical channel, in which the diameter of an inlet being opened is larger than that of an outlet disposed and opened at a rear end surface, is formed, comprising:
a first coating layer that is formed at an inner surface of a front portion of the channel by coating a first wash coat; and
a second coating layer that is formed at an inner surface of a rear portion of the channel by coating a second wash coat;
wherein inner cross section of the front portion is wider than inner cross section of the rear portion.
2. The exhaust gas filter system of claim 1 , wherein the thickness of the second coating layer is equal to or smaller than that of the first coating layer.
3. The exhaust gas filter system of claim 1 , wherein the first coating layer is formed in the front portion and the second coating layer is formed in the rear portion of the filter on the basis of a center line thereof.
4. The exhaust gas filter system of claim 3 , wherein the volume of the first wash coat that is used for the first coating layer is approximately twice as large as that of the second wash coat that is used for the second coating layer.
5. The exhaust gas filter system of claim 4 , wherein the weight of a noble metal that is contained in the first wash coat is equal to that of the noble metal that is contained in the second wash coat, and the concentration (weight/volume) of the noble metal is varied according to the weight of the noble metal.
6. The exhaust gas filter system of claim 1 , wherein a plurality of channels are formed in a flow direction of exhaust gas, the inlet of at least one among the channels is opened and the outlet thereof is closed, the inlet of at least another one among the channels is closed and the outlet thereof is opened, and the closed portions of the inlets are alternatively disposed and the closed portions of the outlets are alternatively disposed.
7. The exhaust gas filter system of claim 1 , wherein the front portion of the filter is soaked in a first wash coat liquid and the rear portion of the filter is soaked in a second wash coat liquid so as to respectively form the first coating layer and the second coating layer.
8. The exhaust gas filter system of claim 7 , wherein the thickness of the first coating layer is adjusted by controlling the used volume of the first wash coat.
9. A passenger vehicle comprising an engine and the exhaust gas filter system of claim 1 .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020080123525A KR20100064876A (en) | 2008-12-05 | 2008-12-05 | Exhaust gas filter system |
KR10-2008-0123525 | 2008-12-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100139261A1 true US20100139261A1 (en) | 2010-06-10 |
Family
ID=42145755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/466,174 Abandoned US20100139261A1 (en) | 2008-12-05 | 2009-05-14 | Exhaust Gas Filter System |
Country Status (3)
Country | Link |
---|---|
US (1) | US20100139261A1 (en) |
KR (1) | KR20100064876A (en) |
DE (1) | DE102009022270A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11643959B2 (en) * | 2021-02-04 | 2023-05-09 | Ford Global Technologies, Llc | Additively manufactured catalytic converter substrates |
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Also Published As
Publication number | Publication date |
---|---|
DE102009022270A1 (en) | 2010-06-10 |
KR20100064876A (en) | 2010-06-15 |
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