EP1859128A1 - Dispositif d'amplification de l'aspiration de gaz recirculant dans le conduit d'admission d'un moteur à combustion interne. - Google Patents
Dispositif d'amplification de l'aspiration de gaz recirculant dans le conduit d'admission d'un moteur à combustion interne.Info
- Publication number
- EP1859128A1 EP1859128A1 EP06726222A EP06726222A EP1859128A1 EP 1859128 A1 EP1859128 A1 EP 1859128A1 EP 06726222 A EP06726222 A EP 06726222A EP 06726222 A EP06726222 A EP 06726222A EP 1859128 A1 EP1859128 A1 EP 1859128A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- intake duct
- duct
- fins
- flow
- convergent
- 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
- 230000003134 recirculating effect Effects 0.000 title claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 6
- 230000006698 induction Effects 0.000 title 1
- 230000007704 transition Effects 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 5
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 43
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 239000008246 gaseous mixture Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
- F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
- F01M13/022—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
-
- 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
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
-
- 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
- F02M26/52—Systems for actuating EGR valves
- F02M26/55—Systems for actuating EGR valves using vacuum actuators
- F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves
Definitions
- the present invention relates to a device for amplifying the suction of recirculating gas in the intake duct of an internal combustion engine.
- recirculating gases may for example be crankcase gases (from the English
- crankcase gas or exhaust gas (or gas EGR, English “exhaust gas recirculation”).
- crankcase gases which come from leaks at the piston rings in the cylinder, were released into the atmosphere without special treatment. It is now mandatory to burn them before rejecting them.
- the document US 5 61 1 204 describes a device for suction of these crankcase gases in a supply circuit of a turbocharged diesel engine.
- the crankcase gases are sucked into the supply circuit between the turbocharger and the intake manifold.
- the supply duct is divided, locally, into a main duct and a bypass duct of smaller section.
- a venturi is arranged in such a way that the suction tap of the casing gases opens at the throat of the venturi.
- US 4,150,646 describes a substantially equivalent device for the recirculation of exhaust gas in a turbocharged diesel engine.
- a venturi and a rotary valve are mounted in parallel in the duct, locally expanded, engine intake.
- the suction connection of the exhaust gas opens at the throat of the venturi.
- a control device connected to the valve, controls the closure of the valve when the pressure in the inlet pipe upstream of the venturi is greater than a threshold value, and the opening of the same valve in the opposite case.
- These devices however, have the disadvantage of being intrusive and therefore of disturbing the flow of air in the intake circuit which causes inconvenience in the driving of the vehicle, in particular pressure losses. engine.
- these devices are inefficient because they are mounted on a pressure circuit conduit, which does not properly suck the recirculating gas.
- the object of the invention is to propose a device making it possible to improve the suction of the recirculating gases in the feed circuit, in particular at low speed, while at the least disturbing the flow of air in the intake duct as little as possible. .
- a device for recirculating gas in an intake duct of an internal combustion engine which is remarkable in that it comprises a recirculating gas re-suction structure, of the convergent / divergent type, disposed in the conduit for defining a main intake flow section in the conduit and a re-suction flow section, said re-aspiration structure having at least one opening extending in the direction of flow in the conduit, said at least one opening communicating the two flow sections.
- the air flow is divided into two parts that can interact because of the presence of the at least one opening.
- the depression is greater, especially at low speeds, when the air flow is low.
- the at least one opening facilitates the manufacture of the device.
- an inlet adapted to cooperate with a gas recirculation pipe is provided in said intake duct, substantially at the converging / diverging transition of the rebreathing structure.
- the re-aspiration is even more effective, since it is at the level of the transition that depression is the most important and therefore the re-aspiration is most effective.
- the recirculating and recirculated gases can be mixed with the gases of the main flow progressively over the entire length of the divergent.
- said at least one opening is formed by an axial slot in said structure.
- said at least one opening is formed by an axial slot in said structure.
- said rebreathing structure is formed by means of at least two fins extending substantially along the axis of the intake duct on either side of said axial slot.
- the device according to the invention is not very intrusive, the fins being very thin, and easy to achieve.
- said at least two fins have a height of between 5 and 10% of the diameter of the intake duct, the distance between the two fins varying along the axial slot from 90 to 25% and then from 25 to 90% the diameter of the intake duct.
- said at least two fins have a height of between 3 and 5 mm, the distance between the two fins varying along said axial slot from 55 mm to 15 mm and then from 15 mm to 55 mm, the diameter of the duct. intake being 60 mm.
- said at least two fins and said intake duct are integrally formed by molding.
- the device is easy to produce.
- said device is made of injected thermoplastic.
- said device is made of rubber.
- the invention also relates to a crankcase recirculation circuit incorporating a device according to the invention, which is remarkable in that it comprises a crankcase gas recirculation duct opening into said intake duct at the level of the convergent transition. / diverging from said re-suction device.
- the invention also relates to an exhaust gas recirculation circuit (or exhaust gas recirculation (EGR) circuit incorporating a device according to the invention, which is remarkable in that it comprises an exhaust gas recirculation duct opening into said intake duct at the convergent / divergent transition of said re-suction device.
- EGR exhaust gas recirculation
- FIG. 1 shows schematically in sectional view along B-B a first embodiment of a device according to the invention
- FIG. 2 shows schematically the device of Figure 1 according to section A-A;
- FIG. 3 schematically shows a second embodiment of a device according to the invention in section C-C;
- FIG. 4 shows schematically the device of Figure 3 according to the section D-D;
- FIG. 5 schematically shows an air intake system of a turbocharged engine provided with a device according to the invention of the type illustrated in Figures 3 and 4
- - Figure 6 schematically shows an air intake system of an atmospheric engine provided with a device according to the invention of the type illustrated in Figures 3 and 4;
- FIG. 7 schematically represents an air intake system of an atmospheric engine provided with a device as illustrated in FIGS. 3 and 4. It should be noted that the proportions are not respected on the drawings in order to make more visible device according to the invention and its outstanding elements.
- FIG. 1 we can see a first embodiment of a device 10 according to the invention comprising all or part of the intake duct 12.
- This intake duct 12 comprises an orifice 14, cooperating here with a tip 16 a recirculating gas recirculation duct, in this case crankcase gases or EGR gases.
- a convergent / divergent type structure 18 forming a convergent 20 and a divergent 22 is disposed in the portion 12 of the intake duct, so that the orifice 14 faces the convergent transition 24 / diverge.
- the convergent / divergent type structure 18 defines two sections 26, 28 in the intake duct 12:
- a main intake flow section 28 complementary section to the re-suction flow section 26 in the duct 12.
- Intake duct 12 is traversed by an incoming flow of fresh air 30 diagrammatically represented by arrow 30.
- This flow 30 entering duct 12 is divided between the two sections 26, 28 of duct 12 to give a re-suction flow. 32 in the re-suction flow section 26, and a main intake flow 34, in the main intake flow section 28.
- FIG. 2 schematically shows a section of the device of Figure 1, according to the sectional plane A-A.
- the structure 18 is made by means of two fins 36, 38, in this case integrally formed with the intake duct 12 and the tip 16 and which extend substantially in the direction of the axis xx 'of the duct 12.
- the two fins 36, 38 are arranged symmetrically with respect to the plane (xx', yy ') and are substantially inclined. one to the other.
- This FIG. 2 also illustrates the presence of an opening 40 extending, between the two fins 26, 27, substantially in the direction of the flow 30, direction almost identical to those of the partial flows 32 and 34, represented in FIG. 1 parallel to the axis xx '.
- This opening 40 thus forms a slot in the convergent / divergent structure 18.
- the re-suction flow 32 is accelerated in the convergent 20 while the pressure of the gaseous mixture flowing in the re-suction flow section 26 decreases as this gaseous mixture flows into the convergent 20 from the widest part of the converge toward the narrower portion of the convergent 20.
- a portion of the main intake flow 34 (its upper portion shown in FIG. 1) can mix with the re-suction flow 32.
- the largest part of this main intake flow 34 (its lower part shown in Figure 1) undergoes virtually no disturbance due to the presence of the structure 18.
- the convergent / divergent structure 18 makes it possible to implement the venturi effect of simultaneous acceleration and depression of the re-suction flow 32 to promote the re-aspiration of the recirculating gases 42 at the level of the convergent / divergent transition. 24.
- the main intake flow 34 is relatively undisturbed by the device 10 and the engine head losses are reduced at high speed.
- Another advantage of achieving the converging / diverging type structure 18 by two fins 36, 38 is the ease of manufacture. Indeed, in this case, the intake duct being made of rubber, it is possible to mold the fins together with the rest of the duct and thus to obtain fins having a height of up to 3 mm.
- the fins 36, 38 may have a height of about 5 mm.
- An advantageous embodiment then consists in molding, apart from the device 10, consisting of the conduit 12, the tip 16 and the convergent / divergent type structure 18, made of injected thermoplastic and connecting it to the upstream and downstream parts. downstream of the intake duct by means of, for example, clamps.
- Figures 3 and 4 show a second embodiment of the device according to the invention.
- the device 50 comprises all or part of the intake duct 52.
- This intake duct 52 comprises an orifice 54, cooperating, in this case, with a nozzle 56 of a duct.
- Recirculating gas recirculation in this case, crankcase gases or EGR gases).
- a convergent / divergent type structure 58 forming a convergent 60 and a divergent 62 is disposed in the intake duct 52, so that the orifice 54 faces the convergent / diverging transition 64.
- the convergent / divergent structure 58 defines in the conduit 52 a re-suction flow section 66, located within the convergent / divergent structure 58, and a main intake flow section 68, composed of the remainder of the duct section 52.
- the intake duct 52 is traversed by an incoming flow of fresh air 70 shown schematically by the arrow 70.
- This incoming flow 70 entering the duct 52 is divided between the two sections 66, 68 of the duct 52 to give a flow of re-aspiration 72, in the re-suction flow section 66, and a main intake flow 74, 76, in the main intake flow section 68.
- the convergent / divergent structure 58 is made by means of two fins 78, 80, in this case formed integrally with the intake duct 52 and the nozzle 56 and which extend substantially along the axis xx 'of the duct 52.
- the two fins 78, 80 are substantially parallel to each other in the plane (yy', zz ') and leave a opening 82 between them, the opening 82 extending substantially in the direction of the flow 70, direction almost identical to those of the partial flows 72 and 74, 76, shown in Figure 3 parallel to the axis xx ', forming and a slot in the converging / diverging structure 58.
- the two embodiments presented here (inclined fins 36, 38 and parallel fins 78, 80) are equivalent from a technical point of view. However, the parallel fin embodiment is easier to manufacture in practice.
- the two fins 78, 80 have, in the plane (xx ', yy'), a curved profile approaching and then moving away from the axis xx ', thus realizing the convergent 60 and the divergent 62, the fins 78, 80 shown in Figure 3 showing, by way of illustrative and non-limiting example, a parabolic profile.
- the re-aspiration flow 72 is accelerated in the convergent 60 while the pressure of the gaseous mixture flowing in the re-suction flow section 66 decreases as this gaseous mixture flows into the convergent 60 from the widest part of the converge 60 towards the narrowest portion of the convergent 60.
- a portion of the main intake flow 74, 76 can mix with the re-aspiration flow 72.
- most of this main flow of admission 74, 76 undergoes virtually no disturbance due to the presence of the convergent / divergent structure 58.
- the convergent / divergent structure 58 makes it possible to implement the simultaneous venturi effect of acceleration and depression the re-suction flow 72 to promote the re-aspiration of the recirculating gases 84 at the convergent / divergent transition 64.
- main intake flow 74, 76 is relatively undisturbed by the device 50 and the engine head losses are reduced at high speed.
- the device 50 can be made simply by molding the intake duct 52, in this case made of rubber, which makes it possible to obtain fins 78, 80 having a height of up to 3 mm.
- the fins 78, 80 may have a height of about 5 mm.
- An advantageous embodiment then consists in molding, apart, the device 50 consisting of the conduit 52, the tip 56 and the convergent / divergent type structure 58, injected thermoplastic.
- the device 50 has been mounted between a flow meter 90 and a housing butterfly 92 of an air intake circuit 94 of an atmospheric engine.
- This air intake circuit 94 also comprises an air intake scoop 96 and an air filter 98 mounted between the scoop 96 and the flow meter 90.
- the distance L between the fins at the inlet of the convergent is 55 mm
- the distance I between the fins at the converging / diverging transition 54 is 15 mm
- the height h of the fins is equal to 5 mm and
- the device 50 would reduce the pressure of 60% in the sump for an engine speed of 1250 rpm.
- These quantities may be related to the diameter d of the intake duct 52, values which characterizes the size of the device 50.
- the height h is between 5 and 10% of the diameter d.
- the distance between the two fins 78, 80 varies between about 90% of d, at the inlet of the convergent 60 and the outlet of the divergent 62, and 25% of d, at the level of the convergent / divergent transition 64.
- Figures 5 and 6 show advantageous mounting arrangements of the device 50 respectively in the case of a turbocharged engine and in the case of an atmospheric engine.
- an air intake system 100 of a turbocharged engine is partially and schematically shown.
- the air is admitted into the system 100 at the inlet scoop 102 and is then filtered in the air filter 104.
- a flow meter 106 makes it possible to measure the flow rate of the air flow at the outlet of the
- the device 50 is disposed downstream of this flow meter 106 and upstream of the turbocharger 108 while the air flow is low. The air flow is thus undisturbed by the re-aspiration of the recirculating gases represented by the arrow 110.
- an air intake system 112 of an atmospheric engine is partially and schematically shown.
- the air is admitted into the system 112 at the air intake scoop 1 14 and is then filtered in the air filter 1 16.
- a flow meter 118 makes it possible to measure the flow rate of the air flow by output of this filter 116.
- the device 50 Upstream of a throttle body 120 and downstream of the flowmeter 118, the device 50 allows the recirculation of the recirculating gases represented by the arrow 122.
- the air flow rate is lower in this part of the system. admission, the re-aspiration of the recirculating gases and the presence of the device 50 disturbs less the flow and therefore does not create engine losses.
- the present invention is not limited to the cases presented, provided by way of illustrative and non-limiting examples.
- the realization of the convergent / divergent type structure is not limited to the case of the two fins.
- Many other embodiments are possible, such as the implementation of ribs, plates or platelets, metal or plastic.
- the use of the device is suitable both for a crankcase air recirculation air intake circuit and an exhaust gas recirculation air intake circuit, without modification of the device. .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0502249A FR2882792B1 (fr) | 2005-03-07 | 2005-03-07 | Dispositif d'amplification de l'aspiration de gaz recirculant dans le conduit d'admission d'un moteur a combustion interne |
| PCT/FR2006/050198 WO2006095111A1 (fr) | 2005-03-07 | 2006-03-07 | Dispositif d'amplification de l'aspiration de gaz recirculant dans le conduit d'admission d'un moteur à combustion interne. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1859128A1 true EP1859128A1 (fr) | 2007-11-28 |
| EP1859128B1 EP1859128B1 (fr) | 2008-07-16 |
Family
ID=34954664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06726222A Expired - Lifetime EP1859128B1 (fr) | 2005-03-07 | 2006-03-07 | Dispositif d'amplification de l'aspiration de gaz recirculant dans le conduit d'admission d'un moteur à combustion interne. |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1859128B1 (fr) |
| AT (1) | ATE401494T1 (fr) |
| DE (1) | DE602006001857D1 (fr) |
| FR (1) | FR2882792B1 (fr) |
| WO (1) | WO2006095111A1 (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10316803B2 (en) | 2017-09-25 | 2019-06-11 | Woodward, Inc. | Passive pumping for recirculating exhaust gas |
| US10995705B2 (en) | 2019-02-07 | 2021-05-04 | Woodward, Inc. | Modular exhaust gas recirculation system |
| CN213175878U (zh) | 2020-01-08 | 2021-05-11 | 伍德沃德有限公司 | 排气气体再循环混合器和发动机系统 |
| US11215132B1 (en) | 2020-12-15 | 2022-01-04 | Woodward, Inc. | Controlling an internal combustion engine system |
| US11174809B1 (en) | 2020-12-15 | 2021-11-16 | Woodward, Inc. | Controlling an internal combustion engine system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1828085A (en) * | 1928-04-09 | 1931-10-20 | Chrysler Corp | Crank case ventilator |
| US3680534A (en) * | 1970-03-30 | 1972-08-01 | Chrysler France | Device for the injection of gases into the feed system of an internal combustion engine |
| JPH11324812A (ja) * | 1998-05-20 | 1999-11-26 | Hino Motors Ltd | ベンチュリ型ミキサ |
| SE522759C2 (sv) * | 2000-01-07 | 2004-03-02 | Stt Emtec Ab | Anordning för återförening av avgaser |
| SE522310C2 (sv) * | 2001-03-02 | 2004-02-03 | Volvo Lastvagnar Ab | Anordning och förfarande för tillförsel av återcirkulerade avgaser |
-
2005
- 2005-03-07 FR FR0502249A patent/FR2882792B1/fr not_active Expired - Lifetime
-
2006
- 2006-03-07 WO PCT/FR2006/050198 patent/WO2006095111A1/fr not_active Ceased
- 2006-03-07 EP EP06726222A patent/EP1859128B1/fr not_active Expired - Lifetime
- 2006-03-07 AT AT06726222T patent/ATE401494T1/de not_active IP Right Cessation
- 2006-03-07 DE DE602006001857T patent/DE602006001857D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2006095111A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2882792A1 (fr) | 2006-09-08 |
| EP1859128B1 (fr) | 2008-07-16 |
| DE602006001857D1 (de) | 2008-08-28 |
| WO2006095111A1 (fr) | 2006-09-14 |
| FR2882792B1 (fr) | 2007-04-27 |
| ATE401494T1 (de) | 2008-08-15 |
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