EP2737187B1 - Exhaust device and vehicle comprising such an exhaust device - Google Patents
Exhaust device and vehicle comprising such an exhaust device Download PDFInfo
- Publication number
- EP2737187B1 EP2737187B1 EP11791044.8A EP11791044A EP2737187B1 EP 2737187 B1 EP2737187 B1 EP 2737187B1 EP 11791044 A EP11791044 A EP 11791044A EP 2737187 B1 EP2737187 B1 EP 2737187B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas outlet
- exhaust device
- wall
- exhaust
- downstream wall
- 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.)
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- 239000007789 gas Substances 0.000 claims description 278
- 238000011144 upstream manufacturing Methods 0.000 claims description 45
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 8
- 239000003570 air Substances 0.000 description 26
- 230000000694 effects Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 230000008929 regeneration Effects 0.000 description 7
- 238000011069 regeneration method Methods 0.000 description 7
- 238000010790 dilution Methods 0.000 description 6
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- 230000008569 process Effects 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
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- 239000002245 particle Substances 0.000 description 3
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
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- 230000007704 transition Effects 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001955 cumulated effect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- 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
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
-
- 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
- F01N13/20—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 flared outlets, e.g. of fish-tail shape
-
- 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
- F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
Definitions
- the exhaust system of a vehicle is usually equipped with an exhaust after-treatment system which deals with undesirable substances in exhaust gases.
- Another object of the invention is to provide an exhaust device which can mix the exhaust gases released into the atmosphere with surrounding air, in particular when the vehicle is at standstill, without moving or moving slowly.
- downstream wall can form a generally convex outer surface.
- the term "substantially tangentially” applies to a tangent direction plus all directions forming a low angle with a tangential direction, i.e. all directions forming a angle lying within a range of plus or minus 30 degrees. Besides, the term “substantially tangentially” applies locally, along all or part of the downstream wall. In other words, the term “substantially tangentially” can apply:
- An exhaust device improves the cooling and dilution of the exhaust gases released into the atmosphere. Indeed, the flow of exhaust gases, out of a slot-like gas outlet, enables entrainment of air surrounding the upstream wall.
- the entrained air flow rate is about twice as much as the gas flow rate out of a gas outlet, or even more.
- Gas inlet 2 can have the circular shape of a disc.
- inlet perimeter P2 and inlet area A2 depend on inlet diameter D2, which is for example comprised within 40 to 160 mm.
- An exemplary embodiment has an inlet of 100 mm diameter.
- the exhaust device 1 can comprise a gas outlet 3 which is suitable for releasing exhaust gases into the atmosphere.
- arrows F3 represent the flow of exhaust gases released out of gas outlet 3.
- the gas outlet 3 overall defines an outlet perimeter P3 and an outlet area A3.
- the gas outlet 3 overall defines an outlet perimeter P3 and an outlet area A3, when taken in section along a plane perpendicular to the exhaust flow through the gas outlet 3
- the gas outlet 3 defines in the peripheral wall a downstream wall 13 and an upstream wall 12. Expressed differently, the upstream 12 and downstream 13 walls define between them the gas outlet 3.
- axis Y can nevertheless be arranged at 90 degrees with respect to said forward running direction, for instance being essentially horizontal or essentially vertical.
- the inner wall 14 and the inner surface 12.4 of the upstream wall 12 determine the direction of the flow of exhaust gases F3 at the gas outlet 3.
- the exhaust device 301 is relatively light and easy to manufacture.
- the two gas outlets are arranged symmetrically with respect to a plane which contains a central axis of the main chamber.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
Description
- The present invention relates to an exhaust device, for a vehicle of the type having an internal combustion engine and an exhaust system, in particular of the type comprising a Diesel particulate filter and/or a selective catalytic reduction component. Besides, the present invention relates to a vehicle comprising such an exhaust device.
- The exhaust gases formed during the combustion of fuel in an internal combustion engine, in particular in industrial vehicles, may contain a proportion of undesirable components such as nitrogen oxides (NOx), carbon monoxide (CO), un-burnt hydrocarbons (HC), soot, etc...
- To reduce air pollution, the exhaust system of a vehicle is usually equipped with an exhaust after-treatment system which deals with undesirable substances in exhaust gases.
- One type of exhaust after-treatment system comprises a diesel particulate filter and/or a selective catalytic reduction component which removes un-burnt particles contained in the exhaust gases. A diesel particulate filter and/or a selective catalytic reduction component may eventually become clogged by the un-reacted particles and needs to be regenerated from time to time.
- One way of regenerating the diesel particulate filter and/or a selective catalytic reduction component is to increase the exhaust gases temperature up to a regenerating temperature where the particles trapped in the diesel particulate filter and/or a in a selective catalytic reduction component are oxidized, for instance beyond 600°Celsius.
- In some cases, the driver is compelled to stop the vehicle during the regeneration process. This may be the case in particular for a vehicle working in "start-and-stop" cycles, like refuse collecting trucks or buses, the
regeneration process being then carried out at standstill, because its internal combustion engine cannot reach the regenerating temperature. - However, especially when carried out at standstill, this regeneration process can prove dangerous for the vehicle or for its environment. Indeed, the exhaust pipe, which is located at the downstream end of the exhaust system, usually expels a hot, pointed gas flow, say at 200°Celsius over a distance of about 1200 mm. Hence, the vehicle and/or any element located within reach of this pointed gas flow is exposed to a hot temperature. Eventually, some elements may even be set on fire by this hot, pointed gas flow.
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EP1071868A1 discloses a prior art exhaust device which comprises a gas discharge in the form of a slot for releasing the exhaust gases into the atmosphere. The discharge slot extends perpendicular to the direction of travel of the vehicle. When the vehicle is moving, the exhaust gases released by the outlet slot are diluted by the air slipstream. Thus, the temperature of the exhaust gas flow decreases over a given distance. - Yet, this given distance can be insufficient to avoid any risk for the vehicle and/or its environment caused by the hot exhaust gases. In particular, when the vehicle is at standstill or moving too slow to generate the air slipstream, the exhaust device of
EP1071868A1 still releases hot and undiluted exhaust gases. - It therefore appears that, from several standpoints, there is room for improvement in the exhaust systems of vehicles.
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US 3 952 823 discloses an exhaust device corresponding to the statement portion of claim 1. - It is an object of the present invention to provide an exhaust device which can efficiently decrease the temperature of exhaust gases from an exhaust after-treatment system.
- Another object of the invention is to provide an exhaust device which can mix the exhaust gases released into the atmosphere with surrounding air, in particular when the vehicle is at standstill, without moving or moving slowly.
- A subject-matter of the invention is an exhaust device, for a vehicle of the type having an internal combustion engine and an exhaust system, the exhaust device comprising at least:
- a gas outlet suitable for releasing exhaust gases into the atmosphere, the gas outlet being substantially shaped as a slot;
- a downstream wall extending downstream of the gas outlet and along most or all of the length of said gas outlet, the downstream wall having an outer surface arranged to be in contact with the exhaust gases flowing out of the gas outlet,
- In the present application, the terms "upstream" and "downstream" relate to the flow of exhaust gases which flow from the gas inlet to the gas outlet. In the present application, the terms "inner" and "outer" relate to the volume of the main chamber, i.e. to the volume of the exhaust device.
- In the present application, the term "overall" as applied to inlet and outlet perimeters and areas implies that the whole perimeter or area is to be considered for one gas outlet. For instance, the gas outlet can be divided into several adjacent openings, or even into a plurality of holes. In such a case, the overall outlet area corresponds to the sum of all individual areas of every opening or hole.
- In an embodiment, the downstream wall can form a generally convex outer surface.
- The convexity or curvature may somewhat vary along the longest dimension of the gas outlet.
- In another embodiment, the downstream wall can have a generally plane outer surface.
- An alternative embodiment of the invention is an exhaust device, for a vehicle of the type having an internal combustion engine and an exhaust system, the exhaust device comprising at least:
- a gas outlet suitable for releasing exhaust gases into the atmosphere, the gas outlet being substantially shaped as a slot;
- a downstream wall extending downstream of the gas outlet and along most or all of the length of the gas outlet, the downstream wall having an outer surface arranged to be in contact with the exhaust gases flowing out of the gas outlet
- In the present application, the term "substantially tangentially" applies to a tangent direction plus all directions forming a low angle with a tangential direction, i.e. all directions forming a angle lying within a range of plus or minus 30 degrees. Besides, the term "substantially tangentially" applies locally, along all or part of the downstream wall. In other words, the term "substantially tangentially" can apply:
- either to an invariable direction, in case the outer surface of the downstream wall has a great radius of curvature, e.g. an infinite radius of curvature, viz. the outer surface is plane;
- or to a direction that varies smoothly along all or part of the downstream wall.
- In the present application, the term "length" refers to the longest dimension of an element, e.g. of the gas outlet. The gas outlet has the general shape of a slot, since it has a relatively high ratio of outlet perimeter over outlet area.
- An exhaust device according to the invention improves the cooling and dilution of the exhaust gases released into the atmosphere. Indeed, the flow of exhaust gases, out of a slot-like gas outlet, enables entrainment of air surrounding the upstream wall. The entrained air flow rate is about twice as much as the gas flow rate out of a gas outlet, or even more.
- This entrainment results from the fact that the flow of exhaust gases is released substantially tangentially to the downstream wall, thus avoiding or minimizing the separation of this flow from the downstream wall. Depending on the service conditions, such a flow of exhaust gases can generate some Venturi effect and/or some Coanda effect, hence entrain a flow of surrounding air for diluting and cooling exhaust gases.
- In other words, the specific arrangement of the downstream wall, the upstream wall and the gas outlet can promote Coanda effect and/or Venturi effect. The entrainment of air by the Coanda effect can occur during the regeneration process and when the vehicle is at standstill.
- The higher outlet ratio enhances the flow rate of air intake or air suction, hence the cooling and mixing of exhaust gases. Indeed, the contact surface between air and gas is maximized.
- Even in cases where the exhaust gases enter the exhaust device at nearly 600°C, the temperature of the resulting gas and air mixed flow can be as low as 200°Celsius at only 100 mm away from the outlet, thus avoiding the risks and dangers for persons or elements standing close to a vehicle according to the invention at standstill, during a regeneration process.
- Moreover, the operation of an exhaust device according to the invention is reliable.
- These and other features and advantages will become apparent upon reading the following description in view of the drawings appended thereto, which represent, as non-limiting examples, embodiments of an exhaust device according to the invention.
- The following detailed description of several embodiments of the invention is better understood when read in conjunction with the appended drawings. However, the invention is not limited to the specific embodiments disclosed herewith.
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Figure 1 is a schematic, perspective view of an exhaust device according to a first embodiment of the invention; -
Figure 2 is a gas flow computer model of the pathlines of the gases flowing in and out of the exhaust device offigure 1 ; -
Figure 3 is a cross section taken along plane III atfigure 2 ; -
Figure 4 is a schematic cross section of the exhaust device offigure 1 ; -
Figure 5 is a view similar tofigure 4 of an exhaust device according to a second embodiment of the invention; -
Figure 6 is a view similar tofigure 4 of an exhaust device according to a third embodiment of the invention; -
Figure 7 is a view similar tofigure 4 of an exhaust device according to a fourth embodiment of the invention; -
Figure 8 is a view similar tofigure 4 of an exhaust device according to a fifth embodiment of the invention; -
Figure 9 is a view similar tofigure 4 of an exhaust device according to a sixth embodiment of the invention; -
Figure 10 is a schematic cross section of an exhaust device according to a seventh embodiment of the invention; -
Figure 11 is a perspective view of an exhaust device according to an eighth embodiment of the invention; -
Figure 12 is a translucent, perspective view, at a different angle, of the exhaust device offigure 11 ; -
Figure 13 is a perspective view, taken along arrow XIII atfigure 11 , of the exhaust device offigure 11 ; -
Figure 14 is a gas flow computer model on a truncated perspective view of an exhaust device according to a ninth embodiment of the invention; -
Figure 15 is a computer model on a truncated perspective view, taken along arrow XV atfigure 14 , of the exhaust device offigure 14 ; -
Figure 16 is an enlarged view of detail XVI atfigure 15 ; -
Figure 17 is a view similar tofigure 14 of an exhaust device according to an tenth embodiment of the invention;; -
Figure 18 is a cross section taken along plane XVIII atfigure 17 ; -
Figure 19 is a schematic cross section of a vehicle according to an embodiment of the invention and having an exhaust system comprising an exhaust device according to the invention, the exhaust system being in a first state; -
Figure 20 is a view similar tofigure 19 of the vehicle offigure 18 , the exhaust system being in a second state; -
Figure 21 is a schematic cross section of a vehicle according to another embodiment of the invention and having an exhaust system comprising an exhaust device according to the invention, the exhaust system being in a first state; and -
Figure 22 is a view similar tofigure 21 of the vehicle offigure 20 , the exhaust system being in a second state. -
Figures 1, 2, 3 and4 illustrate an exhaust device 1 according to a first embodiment of the invention. The exhaust device 1 is intended for a vehicle of the type having an internal combustion engine and an exhaust system, in particular of the type comprising a Diesel particulate filter and/or a selective catalytic reduction component. - The exhaust device 1 comprises a
gas inlet 2 which is suitable for connection to a not shown exhaust pipe and by way of a not shown connection means.Gas inlet 2 overall defines an inlet perimeter P2 and an inlet area A2, when taken in section along a plane perpendicular to the exhaust flow through thegas inlet 2. -
Gas inlet 2 corresponds to the overall inlet flow path where exhaust gases enter exhaust device 1, thegas inlet 2 be either formed as one unique opening or as several parallel openings. Atfigure 1 , arrows F2 represent the flow of exhaust gases enteringgas inlet 2.. -
Gas inlet 2 can have the circular shape of a disc. Hence, inlet perimeter P2 and inlet area A2 depend on inlet diameter D2, which is for example comprised within 40 to 160 mm. An exemplary embodiment has an inlet of 100 mm diameter. The inlet ratio of inlet perimeter P2 over inlet area A2 can be defined by the formula R2=P2/A2 which, in the case of disc shaped inlet can be written R2=4/D. With the figures above, expressed in millimetres, the ratio may range between about 0.025 and 0.1 - Furthermore, the exhaust device 1 can comprise a
gas outlet 3 which is suitable for releasing exhaust gases into the atmosphere. Atfigure 1 , arrows F3 represent the flow of exhaust gases released out ofgas outlet 3. Thegas outlet 3 overall defines an outlet perimeter P3 and an outlet area A3. - The
gas outlet 3 substantially has the shape of a slot. At thegas outlet 3, the exhaust gases flowing out of the exhaust device 1 come into contact with outside air. Thegas outlet 3 can be defined as the surface of minimal size through which the gas may exit the exhaust device 1. This surface can be planar, but it can also be a curved surface extending in three dimensions. - The
gas outlet 3 overall defines an outlet perimeter P3 and an outlet area A3, when taken in section along a plane perpendicular to the exhaust flow through thegas outlet 3 - Being in the shape of a slot means that it has a main dimension which is substantially greater that it other dimensions
- In the embodiment of
figures 1 to 3 ,gas outlet 3 is elongated along a straight line, perpendicular to the flow F3. Alternatively, the gas outlet could be elongated along a curved line in lieu of a straight one. The elongation line could even be three-dimensional. Along this line can be defined a length of the gas outlet. Perpendicularly to this line can be defined a width of the gas outlet. - The
gas outlet 3 can have the shape of an oblong rectangle extending in a plane. In such a case, outlet perimeter P3 corresponds to the cumulated lengths of all four sides of the rectangle, i.e. of two long sides having length L3 and two thin sides having width H3. Outlet area A3 depends on outlet width H3 and on outlet length L3. - An exemplary embodiment, suitable for a truck mounted exhaust device, has an outlet having a length comprises between 400 mm and 1500 mm, for example 600 mm, and a width H3 of about 2 to 8 mm, for example 3 mm. The outlet ratio R3 of outlet perimeter P3 over outlet area A3 can therefore range from about 0.25 to 0.66 when expressed in mm. The outlet ratio is high, and in particular substantially greater than the inlet ratio.
- In absolute terms, it can be considered that the gas outlet has the shape of a slot where its length is at least 15 times its width, and preferably at least 50 times its width. In some applications, the ratio of length to width can exceed 200. According to another definition, it can be considered that the outlet has the shape of a slot if the outlet ratio of outlet perimeter P3 over outlet area A3 exceeds 0.2, expressed in mm.
- According to another definition of the shape of the slot, the gas outlet can be defined trough the adimensional ratio R'3=(P3)2/A3. For the outlet to be qualified as a slot, the adimensional ratio is preferably over 50, and more preferably over 200.
- The exhaust device 1 can further comprise a
main chamber 4 located on the flowpath between thegas inlet 2 and thegas outlet 3. In this embodiment, thegas outlet 3 is the sole outlet from themain chamber 4. -
Main chamber 4 is connected to apipe section 5 at a connexion section 4.5.Pipe section 5 is in the form of a cylinder with an axis Y and with a circular basis formed bygas inlet 2. Onfigures 1 to 3 ,pipe section 5 defines thegas inlet 2, the inlet area A2 and the inlet perimeter P2. Connexion section 4.5 approximately has the same area and perimeter than thegas inlet 2. - The
main chamber 4 channels exhaust gases from connexion section 4.5 to thegas outlet 3. In this embodiment,main chamber 4 is in the form of a cylinder so that it is delimited by peripheral wall which comprise a mostly cylindrical wall with an axis substantially parallel to axis Y and with a basis having an aircraft wing profile. - As illustrated at
figure 3 , this aircraft wing profile has a leading edge 3.1 and a trailing edge 3.2. In the example offigures 1 to 3 , themain chamber 4 has an obstructed end located opposite thepipe section 5 along axis Y to its cylindrical wall. - In this embodiment, the
gas outlet 3 is arranged directly in the peripheral wall of themain chamber 4, more precisely in the cylindrical wall. On the other hand, thegas inlet 2 is arranged in an end wall of themain chamber 4, said end wall being essentially perpendicular to axis Y. As a consequence, the flow F3 through thegas outlet 3 is substantially perpendicular to the flow F2 through thegas inlet 2 and the connection section 4.5. - The
gas outlet 3 defines in the peripheral wall adownstream wall 13 and anupstream wall 12. Expressed differently, the upstream 12 and downstream 13 walls define between them thegas outlet 3. - Indeed, in this embodiment, in the vicinity of
gas outlet 3, the upstream 12 and downstream 13 walls can extend in two planar regions which are substantially parallel, i.e. forming an angle of less than 30 degrees, but which are offset along a direction X3 perpendicular to those planar regions. - The
upstream wall 12 is located towards the exterior ofmain chamber 4 as compared to thedownstream wall 13. In this embodiment, the offset between those planar regions extends along a radial direction which is perpendicular to an axis Y. Due to this offset, the flow F3 throughgas outlet 3 will not be perpendicular to the planar regions of the upstream 12 and downstream 13 walls, but rather parallel to at least one of those planar regions. Therefore, their respective "upstream" and "downstream" denominations refer to their respective locations with respect to the flow F3. - The
downstream wall 13 and thegas outlet 3 are respectively arranged so that the exhaust gases flow out ofgas outlet 3 substantially tangentially to thedownstream wall 13. - The exhaust device 1 thereby comprises a
downstream wall 13 extending downstream of thegas outlet 3 and, parallel to axis Y, along all or most of the length L3 ofgas outlet 3.. Thedownstream wall 13 has an outer surface 13.4 arranged to be in contact with the flow F3 exhausted throughgas outlet 3. - According to the invention, the distance between the
downstream wall 13 and a plane P13 tangent to thedownstream wall 13 at thegas outlet 3 generally increases with the distance from thegas outlet 3, along plane P13. - In particular, the
downstream wall 13 can form a generally convex outer surface. In the example offigures 1 to 3 , the whole outer surface of thedownstream wall 13 is convex. The outer surface of thedownstream wall 13 has a curved cross-section that extends fromgas outlet 3 to the trailing edge 3.2 of the aircraft wing profile of themain chamber 4. - In other words, the
downstream wall 13 is arranged with respect to thegas outlet 3 so as to diverge from the exhaust direction D3 of the exhaust gases out of thegas outlet 3. - In other words, the
downstream wall 13 ant thegas outlet 3 are respectively arranged with respect one to the other so that, at thegas outlet 3, the exhaust gases flow out ofgas outlet 3 along a direction D3 substantially tangential to thedownstream wall 13, and so that thedownstream wall 13 then diverges from the exhaust direction D3 as defined at thegas outlet 3. The divergence can be continuous or discontinuous, e.g. by steps. - Preferably, the respective dimensions and orientations of the surface are such that, at least for specified operating conditions (e.g. filter regeneration at standstill), the flow F3 of exhaust gases tends to follow the
downstream wall 13, thereby deviating from its initial direction D3 right at thegas outlet 3 - The cylindrical wall can thereby comprise an
upstream wall 12 extending on an upstream side of the flow F3 throughgas outlet 3.Upstream wall 12 extends, parallel to axis Y, along all of the length L3 ofgas outlet 3. Theupstream wall 12 has an inner surface 12.4 arranged to be in contact with the flow F3 exhausted throughgas outlet 3. - The
upstream wall 12 extends in a volume which is located opposite thedownstream wall 13 with respect to the plane P13 tangent to thedownstream wall 13 at thegas outlet 3. - In other words,
upstream wall 12 anddownstream wall 13 respectively define two elongated, opposite edges ofgas outlet 3. - Exhaust device 1 can be arranged on the vehicle so that axis Y of
main chamber 4 extends essentially parallel to forward running direction of the vehicle equipped thereof. Indeed, the exhaust device is intended to perform its function of exhaust gas dilution especially when the vehicle is at standstill, i.e. when there is no significant natural flow of ambient air around the exhaust device, as compared to when the vehicle is driving at a certain speed. - Alternatively, axis Y can nevertheless be arranged at 90 degrees with respect to said forward running direction, for instance being essentially horizontal or essentially vertical.
- In service, as illustrated at
figures 1 and 2 , gas flow F2, which is at a hot temperature of say 600°Celsius, enters the exhaust device 1 throughpipe section 5 of themain chamber 4, where the gas flow F2 mainly flows parallel to axis Y. - On
figure 2 , the pathlines in full lines represent relatively hot gases, i.e. gases entering the exhaust device 1, whereas the pathlines in dotted lines represent relatively cool gases, i.e. gases released out of exhaust device 1. Upstream air flow is not represented by pathlines atfigure 2 . - Then, the exhaust gases flow through the
main chamber 4 of themain chamber 4 towards thegas outlet 3. Themain chamber 4 thus guides the exhaust gases fromgas inlet 2 togas outlet 3. - Afterwards, the exhaust gases are released out of
gas outlet 3 as gas flow F3. The gas flow F3 enables entrainment of an air flow F12 surroundingupstream wall 12. Thus, downstream the trailing edge 3.2, the total flow F3.2 corresponds to the sum of gas flow F3 plus air flow F12. Therefore, exhaust device 1 improves the cooling and dilution of the exhaust gases released into the atmosphere. - The entrainment of air flow F12 can result from Coanda effect. It may also result from Venturi effect, depending on the baffle location and geometry.
- As illustrated on
figures 3 and4 , the exhaust device 1 can further comprise aninner wall 14 extending inside themain chamber 4 and upstream of thegas outlet 3 and opposite an inner surface 12.4 of a downstream portion 12.1 of theupstream wall 12. - Preferably, the
inner wall 14 lies in the continuation ofdownstream wall 13, such that the plane P13 tangent to thedownstream wall 13 at thegas outlet 3 is also tangent to theinner wall 14 at thegas outlet 3, where theinner wall 14 and thedownstream wall 13 join. - The
inner wall 14 thus defines with the inner surface 12.4 of theupstream wall 12 anintermediate chamber 15 which is arranged to channel the flow of exhaust gases substantially tangentially to the plane P13 tangential to thedownstream wall 13 at thegas outlet 3. - In other words, the
inner wall 14 and the inner surface 12.4 of theupstream wall 12 determine the direction of the flow of exhaust gases F3 at thegas outlet 3. - Thus, the
intermediate chamber 15 also enables entrainment of air flow F12 by properly orienting gas flow F3 at thegas outlet 3. - A length of the
intermediate chamber 15, considered along the exhaust direction D3, is about 20 times the width H3 which represents the smallest dimension among the main dimensions generally defining the outlet perimeter P3. - Preferably, the length of the
intermediate chamber 15 lies between 1 and 50 times the width H3, more preferably over 10 times the width H3. Such a length of theintermediate chamber 15 enhances the entrainment of air flow F12, because it ensures a more uniform tangential orientation of gas flow F3. - In a preferred embodiment, the
intermediate chamber 15 defines a convergent flowpath for the exhaust gases, i.e. so that the available cross section for the flow in theintermediate chamber 15 decreases towards thegas outlet 3. Thus, the exhaust gases are accelerated within theintermediate chamber 15, which also enhances the entrainment of air flow F12. - In the example of
figures 1 to 4 , thedownstream wall 13 prolongs theinner wall 14. In fact,inner wall 14 is integral withdownstream wall 13. Thus, there is a smooth transition betweeninner wall 14 anddownstream wall 13, which prevents flow separation at thegas outlet 3. - The exhaust device 1 can also comprise one
solid baffle 16 located away from themain chamber 4. As illustrated onfigure 3 , baffle 16 is arranged externally to themain chamber 4 and substantially parallel to the cylindrical wall ofmain chamber 4, in the vicinity of thegas outlet 3. Thebaffle 16 is thereby offset from both theupstream wall 12 and thedownstream wall 13 by a certain distance along a direction perpendicular to the cylindrical wall. - Preferably, such a baffle can define a convergent flowpath between the
baffle 16 and an outer surface ofupstream wall 12.Baffle 16 may thus increase the fluid velocity of gas flow F3 and of air flow F12, hence the entrainment rate of air flow F12. - Alternatively, the baffle could extend opposite the downstream wall so as to form a divergent flowpath. Besides, baffle 16 forms a heat shield for protecting surrounding components of the vehicle and may also act as a noise shield if made of or covered by a noise absorbing or reflecting material.
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Figure 5 illustrates anexhaust device 201 according to a second embodiment of the invention. The description of exhaust device 1 given above with reference tofigures 1 to 4 can be transposed toexhaust device 201 and offigure 5 , which is similar thereto, with the noticeable exception of the hereafter stated difference(s). An element ofexhaust device 201 that has a structure or function similar or corresponding to that of an element of exhaust device 1 is given the same reference numeral plus 200. - One can thus define
exhaust device 201, agas inlet 202, agas outlet 203, amain chamber 204, anupstream wall 212, adownstream wall 213, aninner wall 214 and anintermediate chamber 215. -
Exhaust device 201 mainly differs from exhaust device 1, because it is free from any baffle. Thus,exhaust device 201 is relatively compact and can be mounted on vehicles having only a small available space. -
Figure 6 illustrates anexhaust device 301 according to a third embodiment of the invention. The description ofexhaust device 201 given above with reference tofigure 5 can be transposed toexhaust device 301 offigure 6 , which is similar thereto, with the noticeable exception of the hereafter stated difference(s). An element ofexhaust device 301 that has a structure or function similar or corresponding to that of an element ofexhaust device 201 is given the same reference numeral plus 100. - One can thus define
exhaust device 301, agas inlet 302, agas outlet 303, amain chamber 304, anupstream wall 312 and adownstream wall 313. -
Exhaust device 301 mainly differs fromexhaust device 201, becauseexhaust device 301 does not have any intermediate chamber nor any inner wall extending into themain chamber 304. - Thus, the
exhaust device 301 is relatively light and easy to manufacture. -
Figure 7 illustrates anexhaust device 401 according to a fourth embodiment of the invention. The description of exhaust device 1 given above with reference tofigures 1 to 4 can be transposed toexhaust device 401 offigure 7 , which is similar thereto, with the noticeable exception of the hereafter stated difference(s). An element ofexhaust device 401 that has a structure or function similar or corresponding to that of an element of exhaust device 1 is given the same reference numeral plus 400. - One can thus define
exhaust device 401, a gas inlet 402, agas outlet 403, amain chamber 404, anupstream wall 412, adownstream wall 413, aninner wall 414 and anintermediate chamber 415. -
Exhaust device 401 mainly differs from exhaust device 1, becauseexhaust device 401 comprises several baffles 416.1, 416.2 and 416.3, which are arranged so as to be offset along a direction parallel to the flow F3, but substantially parallel to one another. The baffles are nevertheless preferably curved or angled between them, as exemplified onfigure 7 , so as to define between them successive convergent flow paths. Baffles 416.1, 416.2 and 416.3 increase the rate of air flow entrained in by gas flow released out ofgas outlet 403. -
Figure 8 illustrates anexhaust device 501 according to a fifth embodiment of the invention. The description ofexhaust device 201 given above with reference tofigure 5 can be transposed toexhaust device 501 offigure 8 , which is similar thereto, with the noticeable exception of the hereafter stated difference(s). An element ofexhaust device 501 that has a structure or function similar or corresponding to that of an element ofexhaust device 201 is given the same reference numeral plus 300. - One can thus define
exhaust device 501, a gas inlet 502, agas outlet 503, a trailing edge 503.2, amain chamber 504, anupstream wall 512, adownstream wall 513, aninner wall 514 and anintermediate chamber 515. -
Exhaust device 501 mainly differs fromexhaust device 201, becauseexhaust device 501 comprises asecond gas outlet 503B, a secondupstream wall 512B, a seconddownstream wall 513B, a secondinner wall 514B and a secondintermediate chamber 515B. First andsecond gas outlets second gas outlets downstream wall - In this particular embodiment, the two gas outlets are arranged symmetrically with respect to a plane which contains a central axis of the main chamber.
- Thus,
exhaust device 501 enables the cooling and dilution of a relatively high rate of exhaust gases released into the atmosphere, because there are two separate gas flows released out of the main chamber. -
Figure 9 illustrates anexhaust device 601 according to a sixth embodiment of the invention. The description of exhaust device 1 given above with reference tofigure 8 can be transposed toexhaust device 601 offigure 9 , which is similar thereto, with the noticeable exception of the hereafter stated difference(s). An element ofexhaust device 601 that has a structure or function similar or corresponding to that of an element ofexhaust device 501 is given the same reference numeral plus 100. - One can thus define
exhaust device 601, gas inlet 602, a first and asecond gas outlets main chamber 604, a first and a secondupstream wall downstream wall intermediate chamber -
Exhaust device 601 mainly differs fromexhaust device 501, becauseexhaust device 601 also comprises a first and asecond baffle baffle 16 of exhaust device 1. - Besides,
exhaust device 601 differs fromexhaust device 501, becauseexhaust device 601 further comprises twovortex generators vortex generators main chamber 604 and respectively on eachdownstream wall - Thus, the
vortex generators gas outlets downstream walls -
Figure 10 illustrates anexhaust device 701 according to a seventh embodiment of the invention. The description ofexhaust device 301 given above with reference tofigure 6 can be transposed toexhaust device 701 offigure 10 , which is similar thereto, with the noticeable exception of the hereafter stated difference(s). An element ofexhaust device 701 that has a structure or function similar or corresponding to that of an element ofexhaust device 301 is given the same reference numeral plus 400. - One can thus define
exhaust device 701,gas inlet 702,gas outlet 703, a trailing edge 703.2, amain chamber 704, anupstream wall 712 and adownstream wall 713. -
Exhaust device 701 mainly differs fromexhaust device 301, because the outer surface of thedownstream wall 713 comprises a concave portion 713.1 and a convex portion 713.2. In other words, the outer surface ofdownstream wall 713 is not totally convex. Only the intermediate portion formed by convex portion 713.2 is convex. - The concave portion 713.1 is located farther away from the
gas outlet 703 than the convex portion 713.2 along the direction of the flow of exhaust gases. The convex portion 713.2 is located, along thedownstream wall 713 and away from thegas outlet 703, preferably along at least 20 times the width H703 ofgas outlet 703, width H703 representing the smallest dimension among the main dimensions generally defining the outlet perimeter ofgas outlet 703. - Alike the other embodiments of the invention,
exhaust device 701 enables the cooling and dilution of exhaust gases released into the atmosphere out ofgas outlet 703.. -
Figures 11, 12 and 13 illustrate anexhaust device 801 according to an eighth embodiment of the invention. The description ofexhaust device 501 given above with reference tofigure 8 can be transposed toexhaust device 801 offigures 11, 12 and 13 , which is similar thereto, with the noticeable exception of the hereafter stated difference(s). An element ofexhaust device 801 that has a structure or function similar or corresponding to that of an element ofexhaust device 501 is given the same reference numeral plus 300. - One can thus define
exhaust device 801,gas inlet 802, a first and asecond gas outlets main chamber 804, a first and a secondupstream wall downstream wall intermediate chamber - As illustrated at
figures 11 and 13 , theexhaust device 801 mainly differs fromexhaust device 501, because themain chamber 804 and thepipe section 805 are both cylindrical with a circular basis and coaxial. Thus,exhaust device 801 is relatively compact and easy to manufacture. Furthermore, themain chamber 804 and thepipe section 805 have the same circular, cylindrical shape, so that the transition betweenmain chamber 804 andpipe section 805 does not generate too much pressure drop. - Besides, as illustrated at
figure 12 ,exhaust device 801 further comprises twosymmetrical flow deflectors flow deflector inner wall 814 or 814B thus forming anintermediate chamber flow deflector respective gas outlet gas outlet 803. - Thus, flow
deflectors main chamber 804 intointermediate chamber exhaust device 801. Furthermore, flowdeflectors exhaust device 801. -
Figures 14 and 15 illustrate anexhaust device 901 according to a ninth embodiment of the invention. The description ofexhaust device 201 given above with reference tofigure 5 can be transposed toexhaust device 901 offigures 14 and 15 , which is similar thereto, with the noticeable exception of the hereafter stated difference(s). An element ofexhaust device 901 that has a structure or function similar or corresponding to that of an element ofexhaust device 201 is given the same reference numeral plus 700. - One can thus define
exhaust device 901, agas inlet 902, agas outlet 903, a trailing edge 903.2, amain chamber 904 andpipe section 905, anupstream wall 912, adownstream wall 913, aninner wall 914 and anintermediate chamber 915. - On
figures 14, 15 and 16 , the pathlines in full lines represent relatively hot gases, i.e. gases entering theexhaust device 901, whereas the pathlines in dotted lines represent relatively cool gases, i.e. gases released out ofexhaust device 901. Upstream air flow is not represented by pathlines atfigures 14 and 15 . -
Exhaust device 901 differs fromexhaust device 201, becausegas outlet 903 extends in a direction X which is perpendicular to axis Y parallel to which extends themain chamber 904. In other words, the inlet gas flow direction F902 is substantially parallel to the outlet gas flow direction F903. Consequently,pipe section 905 has a different shape. - Such an exhaust device can generate a relativelty low pressure drop. Besides, such a construction provides more compacity .
-
Figures 17 and 18 illustrate anexhaust device 1101 according to an tenth embodiment of the invention. The description ofexhaust device 601 given above with reference tofigure 9 can be transposed toexhaust device 1101 offigures 17 and 18 , which is similar thereto, with the noticeable exception of the hereafter stated difference(s). An element ofexhaust device 1101 that has a structure or function similar or corresponding to that of an element ofexhaust device 601 is given the same reference numeral plus 500. - One can thus define
exhaust device 1101, agas inlet 1102, twogas outlets main chamber 1104 and pipe section 1105, twoupstream walls downstream walls baffles -
Exhaust device 1101 differs fromexhaust device 601, because eachdownstream wall gas outlet 1103 and to the plane outer surface. - The exhaust direction D1103 corresponds to an average direction along which the flow F1103 of exhaust gases is released from
gas outlet 1103. Angle A1103 can range from 1° to 35°, so as to entrain an appropriate rate of air flow F1102. - An angle similar to angle A1103 can be measured for
gas outlet 1103B. - The plane outer surface is preferably preceded by another portion which is effectively tangent to the flow of exhaust gases at the
gas outlet 1103, and these two portions are connected either smoothly or by a sudden angulations or by a series of successive angulations. - Alternatively, the plane portion of the
downstream wall 1113 might extend directly from thegas outlet 3. As inexhaust device 601, the distance between thedownstream wall 1113 and a plane tangent P1113 at thegas outlet 1103 generally increases with the distance to thegas outlet 1103, if it then admitted that the plane P1113 is the plane tangent to the flow direction F3 at thegas outlet 3. - As in
exhaust device 601, thedownstream wall 1113 is arranged with respect to thegas outlet 1103 so that the exhaust gases flow out of thegas outlet 1103 substantially along the exhaust direction D1103 diverging from thedownstream wall 1113, but, further away, the exhaust gases tend to follow the downstream surface due to a Coanda effect. -
Figures 19 and 20 illustrate avehicle 100 having aninternal combustion engine 121 and anexhaust system 122. Theexhaust system 122 can comprise a Dieselparticulate filter 123 and aterminal exhaust pipe 124 located at the downstream end ofexhaust system 122. Thevehicle 100 further comprises anexhaust device 101 according to the invention. - The
exhaust device 101 comprises agas outlet 103 and amain chamber 104. Theexhaust device 101 further comprises: - a
release opening 118 located at one end of themain chamber 104; therelease opening 118 is connected to theexhaust pipe 124; - a
shutter 119 which is arranged to be mobile between:- an open position (
fig.18 ), in which the exhaust gases flow through the release opening 118 towards exhaust pipe 124 (see arrow F124), - and a closed position (
fig.17 ), in which the exhaust gases are prevented from flowing through therelease opening 118, such that the exhaust gases flow through the gas outlet 103 (see arrow F103).
- an open position (
- Thus, the flowpath extending between
gas inlet 102 and release opening 118 can generate less pressure drop than the flowpath extending betweengas inlet 102 andgas outlet 103. - In service, when the vehicle is not at standstill, e.g. when an industrial vehicle is in a haulage phase, the
shutter 119 can be set open to decrease pressure drop within theexhaust system 122. When the vehicle is at standstill to operate a regeneration process of the Dieselparticulate filter 123 and/or of a not shown selective catalytic reduction component,shutter 119 is closed to ensure cooling and dilution of exhaust gases released out of theexhaust system 122. - The shutter can be controlled depending on the temperature of the exhaust gases F102 entering the
gas inlet 102. -
Figures 21 and 22 illustrate an alternative, flowsensitive shutter 219 which can be mounted in lieu of controlledshutter 119. Flowsensitive shutter 219 moves in dependence to the gas flow rate passing through theexhaust system 122. Thus, flowsensitive shutter 219 can move continuously between different, adjacent positions. - A further embodiment of an exhaust device may have two main chambers, each chamber being for example similar to the one described in relation to
Figure 5 . The two main chambers are arranged in a mirror configuration so that their respective gas outlets, upstream wall and downstream wall are facing each other. With such a configuration, the entire volume comprised between the respective main chambers forms a flow path in which air can be entrained from both. - Of course, the invention is not restricted to the embodiments described above by way of non-limiting examples, but on the contrary it encompasses all embodiments thereof.
and wherein the distance between the downstream wall and a plane tangent to the downstream wall at the gas outlet generally increases with the distance from the gas outlet, and wherein the exhaust device comprises a main chamber delimited by peripheral walls, wherein the gas outlet is arranged in said peripheral walls and wherein said downstream wall is a peripheral wall of the chamber.
and wherein the exhaust device further comprising an inner wall extending upstream of the gas outlet and opposite a downstream portion of the downstream wall so as to define at least one intermediate chamber where the flow of exhaust gases is directed substantially tangentially to the downstream wall.
Claims (16)
- An exhaust device (1 ; 101 ; 201 ; 301 ; 401 ; 501 ; 601 ; 701 ; 801 ; 901 ; 1001 ; 1101), for a vehicle (100) of the type having an internal combustion engine (121) and an exhaust system (122), the exhaust device (1 ; 101 ; 201 ; 301 ; 401 ; 501 ; 601 ; 701 ; 801 ; 901 ; 1001 ; 1101) comprising at least:- a gas outlet (3 ; 103 ; 203 ; 303 ; 403 ; 503 ; 603 ; 703 ; 803 ; 903 ; 1103) suitable for releasing exhaust gases into the atmosphere, the gas outlet being substantially shaped as a slot;- a downstream wall (13 ; 213 ; 313 ; 413; 513 ; 613 ; 713 ; 813 ; 913 ; 1013 ; 1113) extending downstream of the gas outlet and along most or all of the length (L3) of said gas outlet (3 ; 103 ; 203 ; 303 ; 403 ; 503 ; 603 ; 703 ; 803 ; 903 ; 1103), the downstream wall having an outer surface (13.4) arranged to be in contact with the exhaust gases flowing out of the gas outlet;wherein the gas outlet and the downstream wall are arranged respectively so that the exhaust gases flow out of the gas outlet (3 ; 103 ; 203 ; 303 ; 403 ; 503 ; 603 ; 703 ; 803 ; 903 ; 1103) substantially tangentially to the downstream wall (13 ; 213; 313; 413; 513; 613; 713; 813; 913; 1013; 1113);
wherein the distance between the downstream wall (13 ; 1113) and a plane tangent (P13 ; P1113) to the downstream wall (13 ; 1113) at the gas outlet (3 ; 1103) generally increases with the distance from the gas outlet (3 ; 1103);
characterized in that the exhaust device comprises a main chamber (4 ; 104 ; 204 ; 304 ; 404 ; 504 ; 604 ; 704 ; 804 ; 904 ; 1104) delimited by peripheral walls, wherein the gas outlet (3 ; 203 ; 303 ; 403 ; 503 ; 603 ; 703 ; 803 ; 903 ; 1103) is arranged in said peripheral walls and wherein said downstream wall (13; 213; 313; 413; 513; 613; 713; 813; 913; 1013; 1113) is a peripheral wall of the chamber. - An exhaust device (1 ; 101 ; 201 ; 301 ; 401 ; 501 ; 601 ; 701 ; 801 ; 901) according to claim 1, wherein the downstream wall has a generally convex outer surface.
- An exhaust device (1 ; 701) according to claim 2, wherein at least an intermediate portion (713.2) of the outer surface of the downstream wall (13 ; 713) is convex, the intermediate portion (713.2) extending, along the downstream wall (13 ; 713) and away from the gas outlet (3 ; 703), along a distance which is preferably at least 10 times, preferably at least 20 times, and most preferably at least 30 times the smallest dimension (H3 ; H703) among the main dimensions generally defining the gas outlet (3; 703).
- An exhaust device according to claim 3, wherein the whole outer surface of the downstream wall (13 ; 213 ; 313 ; 413 ; 513 ; 613 ; 813 ; 913) is convex.
- An exhaust device (701) according to any one of claims 1 to 3, wherein the outer surface of the downstream wall (713) comprises at least a plane portion or a concave portion (713.1).
- An exhaust device according to claim 1, wherein said peripheral walls of the main chamber (4 ; 104 ; 204 ; 304 ; 404 ; 504 ; 604 ; 704 ; 804 ; 904 ; 1104) comprise an upstream wall (12 ; 212 ; 312 ; 412 ; 512 ; 612 ; 712 ; 812 ; 912 ; 1112) extending upstream of the gas outlet and along most or all of the length (L3) of said gas outlet (3 ; 103 ; 203 ; 303 ; 403 ; 503 ; 603 ; 703 ; 803 ; 903 ; 1103), the upstream wall having an inner surface (12.4) arranged to be in contact with the exhaust gases flowing towards the gas outlet.
- An exhaust device according to claim 6, wherein, along the gas outlet, the upstream wall (12 ; 212 ; 312 ; 412 ; 512 ; 612 ; 712 ; 812 ; 912 ; 1112) is arranged so as be substantially parallel to the plane (P13 ; P1113) tangent to the downstream wall (13 ; 1113) at the gas outlet (3 ; 1103).
- An exhaust device according to claim 7, wherein the upstream wall (12 ; 212 ; 312 ; 412 ; 512 ; 612 ; 712 ; 812 ; 912 ; 1112) is offset from said plane (P13 ; P1113) tangent to the downstream wall (12 ; 1112), according to a direction perpendicular to said plane (P13 ; P1113).
- An exhaust device according to any one of claims 6 to 8, further comprising an inner wall (14 ; 214 ; 414 ; 514 ; 614 ; 814 ; 914) extending inside said main chamber (4 ; 104 ; 204 ; 304 ; 404 ; 504 ; 604 ; 704 ; 804 ; 904) and upstream of the gas outlet (3 ; 203 ; 403 ; 503 ; 603 ; 803 ; 903) and opposite a downstream portion of the upstream wall (12 ; 212 ; 412 ; 512 ; 612 ; 812 ; 912) so as to define at least one intermediate chamber (15 ; 215 ; 415 ; 515 ; 615 ; 815 ; 915) which is arranged to guide the flow of exhaust gases substantially tangentially to the downstream wall (13 ; 213 ; 413 ; 513 ; 613 ; 813 ; 913).
- An exhaust device according to claim 9, wherein a length of the intermediate chamber (15 ; 215 ; 415 ; 515 ; 615 ; 815 ; 915), considered along the upstream wall (12 ; 212 ; 412 ; 512 ; 612 ; 812 ; 912), is at least 10 times, preferably at least 20 times and most preferably at least 30 times the smallest dimension (H3) among the main dimensions generally defining the gas outlet.
- An exhaust device according to any one of claims 9 or 10, wherein the intermediate chamber (15; 215; 415; 515; 615; 815; 915) defines a convergent flow path for the exhaust gases.
- An exhaust device according to any one of claims 9 to 11, wherein the downstream wall (13 ; 213 ; 413 ; 513 ; 613 ; 813 ; 913) prolongs the inner wall (14 ; 214 ; 414 ; 514 ; 614 ; 814 ; 914).
- An exhaust device (101) according to any preceding claim, further comprising at least:- a release opening (118) located at one end of the main chamber (204);- a shutter (119 ; 219) arranged to be mobile between an open position, in which the exhaust gases (F102) flow through the release opening (118), and a closed position, in which the exhaust gases (F102) are prevented from flowing through the release opening (118), such that the exhaust gases (F102) flow through the gas outlet (103).
- An exhaust device according to claim 13, wherein the shutter (119 ; 219) is controlled depending on the temperature of the exhaust gases (F102) entering the gas inlet (102) and/or depending on the vehicle speed.
- An exhaust device (501 ; 601 ; 801) according to any preceding claim, comprising at least two gas outlets (503, 503B ; 603, 603B ; 803, 803B) arranged so that the exhaust gases flow out of each gas outlet (503, 503B ; 603, 603B ; 803, 803B) in a direction substantially tangential to a respective downstream wall (513 ; 613 ; 813) and so that the exhaust gases flow out of each gas outlet (503, 503B ; 603, 603B ; 803, 803B) in two directions which are substantially convergent.
- A vehicle (100) having an internal combustion engine (121) and an exhaust system (122), in particular of the type comprising a Diesel particulate filter (123) and/or a selective catalytic reduction component, the vehicle (100) being characterized in that it further comprises at least one exhaust device (1 ; 101 ; 201 ; 301 ; 401 ; 501 ; 601 ; 701 ; 801 ; 901 ; 1001) according to any preceding claim.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/IB2011/002422 WO2013017908A1 (en) | 2011-07-29 | 2011-07-29 | Exhaust device and vehicle comprising such an exhaust device |
Publications (2)
Publication Number | Publication Date |
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EP2737187A1 EP2737187A1 (en) | 2014-06-04 |
EP2737187B1 true EP2737187B1 (en) | 2017-05-03 |
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EP11791044.8A Active EP2737187B1 (en) | 2011-07-29 | 2011-07-29 | Exhaust device and vehicle comprising such an exhaust device |
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EP (1) | EP2737187B1 (en) |
JP (1) | JP5978300B2 (en) |
WO (1) | WO2013017908A1 (en) |
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NL2008470C2 (en) * | 2012-03-12 | 2013-09-16 | Daf Trucks Nv | TRUCK PROVIDED WITH A DEVICE FOR REDUCING EXHAUST GAS TEMPERATURE. |
JP2014163227A (en) * | 2013-02-21 | 2014-09-08 | Kobelco Contstruction Machinery Ltd | Exhaust structure of construction machine |
JP6991595B2 (en) * | 2020-03-30 | 2022-02-03 | 征男 増山 | Exhaust promotion device |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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GB252546A (en) * | 1925-05-28 | 1926-06-03 | Roman Jarmorkin | Improvements in and relating to silencers for power driven vehicles |
US3952823A (en) * | 1972-07-10 | 1976-04-27 | Hinderks M V | Vehicle gas extractor |
US3875745A (en) * | 1973-09-10 | 1975-04-08 | Wagner Minning Equipment Inc | Venturi exhaust cooler |
US4465154A (en) * | 1979-06-29 | 1984-08-14 | Hinderks M V | Vehicle gas extractor |
US4665691A (en) * | 1986-03-24 | 1987-05-19 | Eller Harold E | Exhaust back pressure reducer |
EP1071868B1 (en) | 1998-04-06 | 2002-08-28 | Ford Global Technologies, Inc. | Motor vehicle exhaust system |
DE102005034462A1 (en) * | 2004-11-09 | 2006-05-11 | Daimlerchrysler Ag | Automotive internal combustion engine exhaust system with low-pressure zone co-located with ambient air inlet |
JP2010127085A (en) * | 2008-11-25 | 2010-06-10 | Mitsubishi Fuso Truck & Bus Corp | Exhaust emission control device of engine |
-
2011
- 2011-07-29 EP EP11791044.8A patent/EP2737187B1/en active Active
- 2011-07-29 WO PCT/IB2011/002422 patent/WO2013017908A1/en active Application Filing
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JP5978300B2 (en) | 2016-08-24 |
JP2014521863A (en) | 2014-08-28 |
EP2737187A1 (en) | 2014-06-04 |
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