EP2092169A1 - Equipment for mounting an exhaust gas bypass duct comprising an upstream end section supported by a pollution control device - Google Patents
Equipment for mounting an exhaust gas bypass duct comprising an upstream end section supported by a pollution control deviceInfo
- Publication number
- EP2092169A1 EP2092169A1 EP07858635A EP07858635A EP2092169A1 EP 2092169 A1 EP2092169 A1 EP 2092169A1 EP 07858635 A EP07858635 A EP 07858635A EP 07858635 A EP07858635 A EP 07858635A EP 2092169 A1 EP2092169 A1 EP 2092169A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- upstream end
- exhaust gas
- casing
- exhaust
- arrangement according
- 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
- 238000011144 upstream manufacturing Methods 0.000 title claims abstract description 85
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 69
- 238000001816 cooling Methods 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 239000013529 heat transfer fluid Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 231100001234 toxic pollutant Toxicity 0.000 description 1
Classifications
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single 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
- 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
-
- 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
- F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
- F01N3/043—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids without contact between liquid and exhaust gases
-
- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
-
- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
-
- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
-
- 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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/08—Gas passages being formed between the walls of an outer shell and an inner chamber
-
- 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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
-
- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
-
- 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
Definitions
- the invention relates to an arrangement for mounting a bypass line of a part of the exhaust gas on a motor vehicle exhaust system which comprises an exhaust duct and an exhaust gas cleaning device. .
- the invention more particularly relates to an arrangement of an exhaust gas bypass duct in an exhaust system of an internal combustion engine, particularly a motor vehicle, comprising:
- an exhaust duct in which exhaust gases flow from upstream to downstream; an exhaust gas depollution device which is interposed in the exhaust duct and which comprises a casing which has an inner face delimiting a chamber enclosing a depollution element, the chamber comprising at least one inlet upstream orifice; exhaust gas and at least one downstream outlet of the exhaust gas;
- bypass duct of at least a portion of the exhaust gas which is delimited radially by an inner face, which comprises an upstream end orifice which is connected in shunt to the exhaust duct downstream of the exhaust element; depollution.
- exhaust gas depollution device is arranged in the part of the exhaust duct which is located downstream of the turbine and has at least one inlet port and one exhaust gas outlet orifice.
- exhaust gas recirculation also called EG R for "Exhaust Gas Recirculation" in English terminology, is another of the known solutions which has become widespread and which is implemented alone or in combination with a exhaust emission control device to reduce emissions and comply with anti-pollution standards.
- the recirculation of exhaust gas is to reinject a portion of the exhaust gas into the cylinder combustion chamber via a recirculating circuit.
- Such an exhaust gas recirculation circuit generally comprises at least one controlled regulation means, such as a valve, adapted to control the recirculation of at least a portion of the exhaust gases to the engine via at least one bypass line which is connected bypass between the exhaust duct and the intake duct.
- at least one controlled regulation means such as a valve
- the recirculation circuit is of the so-called "high pressure" type when the inlet tap of the bypass pipe on the exhaust pipe is made upstream of the turbine and the connection of the outlet in the intake duct is made downstream of the compressor.
- the EG R level is important but harmful because by reducing the flow rate of the exhaust gas passing through the turbine, it correlatively limits the maximum load that can be supplied to the intake by the compressor since the compressor is directly driven by the turbine.
- the recirculation circuit is of the so-called "low pressure" type when the inlet tap of the bypass pipe on the exhaust pipe is made downstream of the turbine and the connection of the outlet in the intake duct is made upstream of the compressor.
- Such a low-pressure recirculation circuit makes it possible to solve the aforementioned drawbacks of the high-pressure type circuits such as the pumping phenomenon or the maximum load limit on admission.
- the flow rate of the exhaust gas passing through the turbine is always maximum regardless of the speed and the flow rate of the gas is substantially constant when the EG rate R, that is the proportion of recirculated gases, increases by so that the operating point obtained is moving away from the pumping limit values.
- the exhaust gases include soot particles which are likely to cause fouling and corrosion problems, in particular of the EG R valve, the compressor and the charge air cooler.
- the tap of the bypass pipe is generally made downstream of a pollution control device, such as a particulate filter, which is arranged in the exhaust duct downstream of the turbine.
- a pollution control device such as a particulate filter
- the tap of the branch pipe is sometimes problematic because the space available for the arrangement of the bypass pipe is generally reduced.
- the invention proposes an exhaust circuit of the type described above, characterized in that at least one upstream end section of the bypass pipe which is arranged outside the chamber of the device. depollution, is carried by the housing of the depollution device.
- the upstream end orifice of the bypass pipe is arranged in a downstream end section of the casing of the depollution device;
- the arrangement comprises controlled flow control means of the exhaust gas diverted towards the bypass line, these controlled regulation means being arranged in a downstream end portion of the chamber of the depollution device;
- the upstream end section of the bypass pipe comprises a tube which extends parallel to the casing of the depollution device;
- bypass pipe is carried by the casing of the depollution device by means of fixing clamps;
- a portion of the inner face of the upstream end section of the bypass pipe is formed by at least a portion of the outer face of the housing of the pollution control device;
- the upstream end section of the bypass duct is formed by an outer tubular casing which surrounds the casing of the depollution device so as to form an annular duct around the casing;
- the casing is carried by the casing via at least one carrier ring which is interposed between the casing and the casing, the bearing ring being perforated with at least one passage of the exhaust gas diverting ;
- the casing of the depollution device is made of a heat-conducting material between its inner face and its outer face so that the heat of the diverted exhaust gases is transmitted to the depollution element;
- the bypass line comprises means for cooling the exhaust gases diverted
- the cooling means are arranged downstream of the upstream end section of the bypass pipe; the cooling means are arranged in the upstream end section of the bypass pipe;
- the cooling means comprise at least one coolant pipe which is arranged inside the bypass pipe parallel to the flow direction of the exhaust gas.
- FIG. 1 is a schematic view showing a powertrain comprising an exhaust circuit which is equipped with a pollution control device on which a branch line is arranged according to the state of the art;
- FIG. 2 is an axial sectional view which shows a depollution device on which a branch line has been arranged according to the teachings of the invention
- - Figure 3 is a view similar to that of Figure 2 which shows a second embodiment of the invention
- FIG. 4 is a view similar to that of Figure 2 which shows a third embodiment of the invention.
- Figure 5 is a radial sectional view along the sectional plane 5-5 of Figure 4;
- FIG. 6 is a view similar to that of Figure 4 which schematically shows an arrangement according to the third embodiment of the invention wherein the bypass line comprises cooling means.
- a downstream upstream orientation will be adopted according to the direction of flow of the exhaust gases.
- Axial and radial directions are also used with reference to the main axis of the cylindrical housing of the depollution device and which are indicated by the arrows "A, T" of Figure 2.
- the radial direction is directed from the inside. outwardly from the crankcase axis, while the axial direction is directed from the rear to the front.
- FIG. 1 diagrammatically shows a powertrain 10 for a motor vehicle known from the state of the art.
- the power train 1 0 includes a supercharged internal combustion engine 12 comprising a compressor 14 which is arranged in an intake duct 1 6 upstream of an intake manifold 1 8 of the intake circuit 20 and which is driven into rotation by a turbine 22 which is arranged in an exhaust duct 24 downstream of an exhaust manifold 26 of an exhaust circuit 28.
- the intake duct 16 comprises respectively an upstream portion 1 6A extending from the inlet of the intake duct 1 6 to the compressor 14 and a downstream portion 1 6B extending from the compressor 14 to the engine cylinders 12.
- the downstream portion 16B of the intake duct 16 comprises a charge air cooler (not shown).
- the power train 1 0 preferably comprises an exhaust gas cleaning device 30 which is interposed in the exhaust pipe 24 downstream of the turbine 22
- the exhaust duct 24 thus has an upstream portion 24A extending from the cylinders of the engine 1 2 to the turbine 22, an intermediate portion 24B between the turbine 22 and the pollution control device 30 and a downstream portion 24C s' extending from the depollution device 30 to the outlet of the exhaust duct 24.
- the exhaust gas cleaning device 30 comprises a housing 32 which has an inner face 34 defining a chamber 36 enclosing a depollution element 38.
- chamber 36 comprises at least one upstream inlet "OE" inlet of the exhaust gas and at least one downstream orifice "OS" exhaust gas outlet.
- the chamber 36 here more particularly comprises a single inlet orifice "OE” which opens into the intermediate section 24B of the exhaust duct 24 and an orifice of "OS” outlet which opens into the downstream end section 24C of the exhaust duct 24.
- the exhaust gases then pass through the chamber 36 which therefore forms part of the exhaust duct 24, passing through the depollution element 38.
- the chamber 36 here has the shape of a cylinder whose upstream and downstream ends form cones which converge to the inlet ports "OE" and "OS” exit.
- the "OE" and “OS” exit ports open here in an axial direction.
- the depollution element 38 of the exhaust gas is for example constituted by a catalyst and / or a particulate filter, and / or a nitrogen oxide absorber (NOx).
- the power train 1 0 comprises an exhaust gas recirculation circuit 40 comprising at least one control means 42 controlled to control the recirculation of at least a portion of the exhaust gas to the engine 1 2 via at least one bypass line 44 which is connected in shunt to the exhaust duct 24 downstream of the depollution element 38 of the pollution control device 30 so as to produce an exhaust gas recirculation circuit 40 of the type low pressure.
- a downstream end port 47 of the bypass line 44 is connected to the intake duct 1 6A upstream of the compressor 14, while an upstream end port 48 of the bypass line 44 is connected to the duct. exhaust 24 downstream of the depollution element 38.
- control means 42 controlled to control the recirculation of at least a portion of the exhaust gas to the engine 1 2 is for example constituted by a valve, called EG R valve, which can be arranged at the entering or leaving the bypass line 44.
- the EG R valve 42 is here more particularly arranged at the inlet of the bypass line 44.
- the invention proposes an arrangement of the more compact bypass line 44 which takes up less space and in which at least one upstream end section 46 of the bypass line 44 is arranged outside the chamber 36 of the depollution device 30, the upstream end section 46 being carried by the casing 32 of the depollution device 30.
- the upstream end section 46 of the branch pipe 44 has an axial length substantially equal to that of the casing 32.
- FIG. 2 shows a first embodiment of the invention in which the upstream end orifice 48 of the bypass line 44 is arranged in a downstream end section of the casing 32 of the depollution device 30.
- the upstream end orifice 48 opens directly into the chamber 36 of the depollution device 30, and more particularly in a downstream end section of the casing 32 downstream of the depollution element 38.
- the depollution element 38 is arranged in an upstream end portion of the chamber 36, thus reserving a free space in a downstream end portion of the chamber 36.
- the upstream end orifice 48 thus opens into the free end portion downstream of the chamber 36.
- the second outlet downstream orifice 48 opens in a radial direction in the bypass line 44.
- the controlled regulation means 42 of the flow of exhaust gas diverted to the bypass line 44 are arranged in the free end-end portion of the chamber 36 of the pollution control device 30.
- the depollution device 30, the upstream end section 46 of the bypass line 44 and the regulation means 42 of the recirculation circuit 40 form a compact assembly which is easy to mount in a single operation on the motor vehicle and which is not bulky.
- the upstream end section 46 of the bypass pipe 44 is an axial tube which is arranged parallel to the casing 32 of the depollution device 30, close to the depollution device 32.
- the upstream end section 46 is here arranged at a distance from the casing 32.
- the upstream end portion 46 is delimited radially by an inner cylindrical face 52 which is carried solely by the cylindrical wall of the tube.
- the upstream end portion 46 has a radial upstream end portion which is connected to the axial portion by a bend 51 which is arranged opposite the second radial outlet 48 to reorient the diverted exhaust in an axial direction.
- the upstream end section 46 is carried by the casing 32 of the pollution control device 30 by means of fixing flanges 50, each of which is fixed on the one hand to the casing 32 and on the other hand to the end section. upstream 46.
- the upstream end portion 46 is in fact carried by the housing 32 which is itself fixed under the body of the motor vehicle. So I ⁇ depollution device 30 and the upstream end section 46 of the bypass line 44 are fixed together on the vehicle body by common fastening means (not shown).
- the exhaust gas circulates in the chamber 36 of the depollution device 30 from left to right by looking at FIG. 2 while passing through the depollution element 38. Then a portion of the exhaust gases is diverted into the bypass line 44 via the EG R valve 42 and the upstream end port 48 of the bypass line 44. The diverted gases have thus been purified by the depollution element 38.
- the depollution element 38 advantageously comprises a particulate filter which more particularly prevents the diverted exhaust gas from increasing the proportion of particles included in the exhaust gas leaving the cylinders and which prevents the EG R valve 42 from being dirty.
- the diverted exhaust gas then flows parallel to the exhaust gas circulating in the pollution control device 30 but in an opposite direction because the upstream end port 48 of the bypass line 44 is arranged in the downstream end portion of the chamber 36 of the depollution device 30, and the downstream end of the upstream end section 46 of the bypass line 44 is arranged near the inlet port "OS" of the depollution device 30.
- FIG. 3 A second embodiment of the invention is shown in FIG. 3.
- the valve EG R 42 and the upstream end orifice 48 of the upstream end section 48 of the branch pipe 44 are still arranged in the depollution device 30 in the same way as in the first embodiment to obtain the same effects and advantages.
- a part 52A of the inner face of the upstream end section 46 of the branch pipe 44 is formed by at least a portion 52A of the outer face of the casing 32 of the depollution device 30.
- the upstream end portion 46 of the bypass line 44 is formed for example by an axial groove 53 in the form of half-tube cut in two axially with a concave inner face 52B and a convex outer face, that is to say say that the cross section of the trough 53 is open radially inward with respect to the direction of flow of the exhaust gas.
- Gutter 53 is closed axially forward by a radial wall 55 which the upstream end portion forming the bend 51 already described in the first embodiment.
- the bend 51 is here arranged as close as possible to the casing 32, thus further reducing the overall dimensions of the depollution device 30 and of the upstream end section 46 of the bypass line 44.
- the trough 53 is arranged concave face towards the housing 32 so that the axial edges of the trough 53 and the edge of the radial wall 55 are in sealing and continuous contact with the outer face of the housing 32 to form the section of upstream end 46 of the branch pipe 44.
- the radial section of the upstream end portion 46 is thus delimited radially by the internal concave face 52B of the trough 53, on the one hand, and by the outer face portion 52A of the casing 32, on the other hand.
- the upstream end section 46 of the branch pipe 44 and the chamber 46 of the depollution device 30 comprise a common wall 54.
- Gutter 53 is arranged so as to cover the second outlet orifice 48 of housing 32.
- the second outlet orifice 48 is more particularly arranged near the rear radial wall 55 of gutter 53.
- the groove 53 is for example fixed by welding on the casing 32.
- the upstream end section 46 of the branch pipe 44 is carried by the housing 32 and it is not necessary to provide specific fixing points for this section 46 under the body of the motor vehicle.
- the upstream end section 46 of the branch pipe 44 is mounted on the housing 32 before the housing 32 is mounted on the body of the motor vehicle.
- the depollution device 30 and the upstream end section 46 of the bypass line 44 are mounted in a single operation.
- the depollution device 30 and the upstream end section 46 of the bypass line 44 are fixed to the vehicle body by common means of attachment.
- the assembly formed by the depollution device 30 and the upstream end section 48 of the bypass line 44 thus obtained is even more compact than that of the first embodiment.
- At least the portion 52A of the housing 32 partially delimiting the upstream end portion 46 of the bypass line 46 is made of a material which has the property of being a good heat conductor.
- This feature is advantageous when the depollution element 38 is to be heated beyond an activation temperature, for example when the depollution element 38 comprises an oxidation catalyst or a reduction catalyst.
- depollution element 38 comprises components which must be heated above a threshold temperature to be regenerated, for example when the depollution element 38 comprises a particulate filter or a NOx trap.
- FIG. 4 A third embodiment of the invention is shown in FIG. 4. This third embodiment is similar to the second embodiment.
- the depollution element 38 is made, without limitation, in two parts.
- the upstream end section 46 of the branch pipe 44 is here formed by an outer tubular casing 56 coaxial with the casing 32 which surrounds the casing 32 of the depollution device 30 so that the radial section of the upstream end section 46 of the bypass line 44 has an annular shape.
- the upstream end section 46 of the bypass pipe 44 is thus delimited radially outwards by the inner cylindrical face 52B of the casing 56, and it is delimited radially inwards by the outer cylindrical surface 52A of the casing. 32.
- the casing 32 thus forms a common wall which separates the chamber 36 from the depollution device 30 and the upstream end section 46 from the bypass line 44.
- the casing 56 has a front end radial wall 58 which closes the upstream end section 46 of the bypass duct 44 axially forwardly so as to enclose the downstream end of the casing 32 and has a wall radial end rear 60 which closes axially rearward the upstream end of the housing 32.
- the front end wall 58 forms the bend 51 with the tubular part of the casing 56.
- the casing 56 thus completely encloses the casing 32.
- the casing 56 comprises a front opening 62 for passage of the downstream exhaust duct 24C and a rear orifice 64 for the passage of the intermediate exhaust duct 24B. Edges respectively front and rear passage openings are sealingly attached to the exhaust gas against the outer faces of respectively downstream exhaust pipes 24C and 24B intermediate, for example by a weld bead 66.
- the housing 32 comprises at least one second outlet orifice 48 which is formed in its downstream end section which thus opens into the upstream end annular section 46 of the bypass line 44.
- the casing 32 comprises a plurality , for example three, second outlet orifices 48 which open opposite the front end wall 58.
- the envelope 56 also comprises at least one rear downstream orifice 68 which opens into a downstream section of the bypass line 44.
- the envelope 56 comprises a single downstream orifice 68.
- the envelope 56 is carried by the casing 32 via at least one carrier structure 70 allowing the passage of the diverted exhaust gas which is interposed radially between the casing 32 and the casing 56.
- carrier structure 70 As illustrated in FIG. 5, two supporting structures 70 which have the form of perforated carrier rings of axial orifices 72 for diverting exhaust gases are arranged in the annular section 46 of the branch pipe 44.
- Each carrier ring 70 has an outer cylindrical face 71 and an inner cylindrical face 73.
- the outer cylindrical face 71 of the carrier ring 70 is fixed to the inner face 52B of the envelope 56, while the inner cylindrical face 73 of the ring carrier 70 is fixed to the outer face 52A of the housing 32 by gluing, by welding or by any other suitable fastening means.
- the upstream end section 46 of the branch line 44 and the depuration device 30 may be attached to the body of the motor vehicle by common means of fixing.
- the casing 56 is carried by the welding beads 66 made at the front and rear ends of the casing 56 between the casing 56 and the exhaust duct 24.
- the spacing between the casing 56 and the outer face 56A of the casing 32 is then produced by perforated rings or by a metal braided cord arranged helically around the casing 32. The ring or the cord are thus interposed radially between the casing 56 and the casing. housing 32 forming spacers.
- the casing 56 also includes deformable sections 74 which are capable of absorbing the expansion of the exhaust duct and the depollution device 30. Without these deformable sections 74, the welds could in particular deteriorate rapidly.
- the deformable sections 74 here have the shape of an accordion section which is capable of being deformed axially depending on the axial expansion of the depollution element.
- the envelope 56 is here made in two half-shells (not shown) which are assembled in a joint plane parallel to the flow of the exhaust gas.
- the casing 32 is advantageously made of a good heat conducting material in order to obtain the aforementioned advantages associated with this characteristic.
- the third embodiment makes it possible to obtain an assembly even more compact than that of the second embodiment. Indeed, for a radial section of the upstream end portion 46 of the same size, the size of the upstream end portion 46 is homogeneously distributed here all around the casing 32, while in the second embodiment of FIG. realization, the upstream end portion 46 forms a greater radial protuberance in a single direction.
- the bypass line 44 comprises means for cooling the diverted gases. These cooling means are arranged downstream of the upstream end section 46.
- the cooling means are arranged in the upstream end section 46 of the bypass line 44.
- the cooling means comprise at least one heat transfer fluid line 76 which is arranged inside the bypass line 44.
- the heat transfer fluid conduits are advantageously carried by passage holes 72 of the bearing rings 70.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0655044A FR2908831B1 (en) | 2006-11-22 | 2006-11-22 | ARRANGEMENT FOR THE ASSEMBLY OF AN EXHAUST GAS DERIVATION DRIVE HAVING AN END-OF-END FRONTIER CONDUCTED BY A DELEGATION DEVICE |
PCT/FR2007/052213 WO2008062120A1 (en) | 2006-11-22 | 2007-10-19 | Equipment for mounting an exhaust gas bypass duct comprising an upstream end section supported by a pollution control device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2092169A1 true EP2092169A1 (en) | 2009-08-26 |
EP2092169B1 EP2092169B1 (en) | 2012-07-11 |
Family
ID=38180448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07858635A Active EP2092169B1 (en) | 2006-11-22 | 2007-10-19 | Equipment for mounting an exhaust gas bypass duct comprising an upstream end section supported by a pollution control device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2092169B1 (en) |
FR (1) | FR2908831B1 (en) |
WO (1) | WO2008062120A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2926845A1 (en) * | 2008-01-24 | 2009-07-31 | Renault Sas | Flexible exhaust pipe element for motor vehicle, has flexible inner and outer tubes maintained in relative position by end flanges, where inner tube defines central passage, and annular channel formed between inner and outer tubes |
FR2930277A1 (en) * | 2008-04-16 | 2009-10-23 | Peugeot Citroen Automobiles Sa | Exhaust gas depollution unit for e.g. diesel engine of motor vehicle, has filtering substrate maintained in envelope by maintaining sheet, where envelope is surrounded by sleeve in which coolant circulates between inlet and outlet |
FR2930286A3 (en) * | 2008-04-17 | 2009-10-23 | Renault Sas | Exhaust line connector for supercharged diesel engine of motor vehicle, has exhaust pipe for exhausting burnt gas, where burnt gas captured by recirculation pipe is distributed at rear with respect to direction of gas in exhaust pipe |
DE102009014435A1 (en) | 2009-03-26 | 2010-10-14 | J. Eberspächer GmbH & Co. KG | Exhaust gas treatment device |
DE102010025699A1 (en) * | 2010-06-30 | 2012-01-05 | Fev Motorentechnik Gmbh | Internal combustion engine i.e. diesel engine, operating method, involves arranging branches for separating partial exhaust gas flow to exhaust gas recirculation in housing of nitrogen oxide-storage catalyst |
DE102013109338A1 (en) * | 2013-08-28 | 2015-03-05 | Witzenmann Gmbh | Decoupling element for an exhaust system |
DE102013111313A1 (en) * | 2013-10-14 | 2015-04-16 | Witzenmann Gmbh | Conduit for an exhaust system with exhaust gas recirculation |
JP7468996B2 (en) * | 2019-03-25 | 2024-04-16 | フタバ産業株式会社 | EGR device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08291772A (en) * | 1995-04-20 | 1996-11-05 | Mazda Motor Corp | Egr gas taking-out structure for engine |
US6138649A (en) * | 1997-09-22 | 2000-10-31 | Southwest Research Institute | Fast acting exhaust gas recirculation system |
JP2004176554A (en) * | 2002-11-25 | 2004-06-24 | Nissan Motor Co Ltd | Engine erg device |
FR2908472A1 (en) * | 2006-11-14 | 2008-05-16 | Faurecia Sys Echappement | METHOD FOR SUPPLYING EXHAUST GAS TO AN ENGINE, EXHAUST ELEMENT, EXHAUST LINE AND VEHICLE COMPRISING MEANS FOR SUPPLYING SUCH AN EXHAUST GAS ENGINE |
-
2006
- 2006-11-22 FR FR0655044A patent/FR2908831B1/en not_active Expired - Fee Related
-
2007
- 2007-10-19 WO PCT/FR2007/052213 patent/WO2008062120A1/en active Application Filing
- 2007-10-19 EP EP07858635A patent/EP2092169B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008062120A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008062120A1 (en) | 2008-05-29 |
FR2908831A1 (en) | 2008-05-23 |
FR2908831B1 (en) | 2011-11-04 |
EP2092169B1 (en) | 2012-07-11 |
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