• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present injector includes at least one injection nozzle (34), a metering system for providing a metered flow of reducing agent to the or each injection nozzle (34), and an injection line (38). fluidly connecting the metering system to the or each injection nozzle (34). The injection line (38) comprises an upstream pipe (52) fluidly connected to the metering system, at least one downstream pipe (54) fluidly connected to a respective injection nozzle (34), and at least one device. anti-reflux (56) to prevent or minimize fluid flow from the or each downstream pipe (54) to the upstream pipe (52).
    公开号:FR3087836A1
    申请号:FR1859921
    申请日:2018-10-26
    公开日:2020-05-01
    发明作者:Thibaut Jeannerot；James Holloway；Jorn Hansen；Ludovic GEANT
    申请人:Faurecia Systemes dEchappement SAS；
    IPC主号:
    专利说明:

    [0001] DESCRIPTION TITLE Injector for injecting a gaseous reducing agent into a flow of exhaust gas, comprising at least one anti-reflux device The present invention relates to an injector for injecting a reducing agent into the flow of exhaust gas from an engine. internal combustion, the injector being of the ru type comprising at least one injection nozzle, a metering system for providing a metered flow of the reducing agent to the nozzle or to each injection nozzle, and an injection line fluidly connecting the dosing system to the nozzle or to each injection nozzle.
    [0002] The exhaust pipe 10 also includes an exhaust pipe 31 for guiding the exhaust gas.
    This exhaust pipe 31 is shown here positioned downstream of the mixer 30, between the mixer 30 and the RCS catalyst 22.
    As a variant, the exhaust pipe 31 may form part of the mixer 30 or be positioned upstream of the mixer 30, and / or at least partially surround the COD 16, the FDP 21 and / or the ROS catalyst 22.
    The exhaust line 10 further includes an injector 32 for injecting a gaseous reducing agent into the exhaust gas stream in the mixer 30 so that the mixer 30 can thoroughly mix the reducing agent and the exhaust gas. .
    The gaseous reducing agent comprises, for example, ammonia, a mixture of air with ammonia, or a mixture of ammonia and neutral gas such as helium.
    The injector 32 includes an injection nozzle 34 positioned inside the mixer 30 to direct the injected reducing agent into the mixer 30 to mix it with the engine exhaust gas, a metering system 36 for providing a metered flow of reducing agent to the injection nozzle 34, and an injection line 38 fluidly connecting the metering system 36 to the injection nozzle 34.
    Metering system 36 includes a source of reducing agent 40, a metering valve 42 for metering the amount of reducing agent supplied to injection nozzle 34, and a control unit 44 for controlling metering valve 32. so as to control the dosage of the reducing agent in a known manner.
    The source of reducing agent 40 here consists of a source of ammonia.
    This source usually includes a reservoir (not shown) in which ammonia gas is stored under pressure.
    Alternatively, the source comprises salts of urea or strontium chloride (SrCl2) believed to be heated to generate ammonia.
    If we look at Figures 2 to 4, the injection line 38 includes an upstream pipe 52 fluidly connected to the metering system 36, a downstream pipe 54 fluidly connected to the injection nozzle 34, and an anti-reflux device. 56 to minimize fluid flow from downstream pipe 54 to upstream pipe 52, while allowing fluid flow from upstream pipe 52 to downstream pipe 54.
    It has surprisingly been found that this single feature significantly reduced the risk of obstruction of the upstream pipe 52.
    As a result, the downtime of injector 32 has been significantly reduced compared to known ammonia injectors.
    6 The upstream pipe 52 is formed for example by a rigid pipe and / or a flexible pipe.
    Elements can optionally be added to said rigid pipe and / or a flexible pipe.
    The upstream pipe 52 preferably extends from the metering system 36 to the anti-reflux device 56.
    The downstream pipe 54 is formed for example by a rigid pipe and / or a flexible pipe.
    Elements can optionally be added to said rigid pipe and / or a flexible pipe.
    Preferably, the downstream pipe 54 has substantially the same flow section tu as the nozzle 34.
    In the examples shown, the downstream pipe 54 extends from the injection nozzle 34 to the anti-reflux device 56.
    In the examples of Figures 2 to 4, the anti-reflux device 56 is positioned outside the mixer 30.
    The downstream pipe 54 therefore comprises an internal portion 57A extending inside the mixer 30 and an external portion 57B extending outside the mixer 30, the external portion 576 preferably having a length of less than 2 m. , for example less than 20 cm, so that the region of the injection line 38 in which the occurrence of risks of obstruction is minimized.
    The anti-reflux device 56 is preferably integral with the downstream pipe 54 and / or the upstream pipe 52.
    In the embodiment of Figure 2, the anti-reflux device 56 consists of at least one constriction 58 of the injection pipe 38 which has a reduced flow section with respect to the downstream pipe 54.
    In the example shown, this constriction 58 also has a reduced flow cross section with respect to the upstream pipe 52.
    Preferably, the ratio between the flow section of the downstream pipe 54 and the flow section of the constriction 58 is between 4 and 25, for example, is 12.
    The constriction 58 is for example formed by a constriction of the injection pipe 38 or a narrowing of the injection pipe 38, As a variant: the constriction 58 is formed by at least one internal ring arranged inside of the injection line 38.
    In the embodiment of FIG. 3, the anti-reflux device 56 consists of a portion of the injection pipe 38 which has several baffles 60.
    Here; these 35 baffles 60 are two in number.
    Alternatively, the anti-reflux device 56 includes three or more baffles 60.
    In another variant, the anti-reflux device 56 includes a single baffle 60.
    By "baffle" is meant a device which hinders the flow path through said device by imposing a zigzag stroke.
    Such a device is for example a section of pipe formed such that the flow path through said section of pipe is sinuous, the sinuosity of said flow path being greater than 1.20, preferably greater than 1.57. .
    In the example shown, each baffle 60 defines a constriction in the injection pipe 38. ro In the embodiment of FIG. 4, the anti-reflux device 56 consists of a non-return valve 62 configured to allow a fluid flow in only one direction, from the upstream pipe 52 to the downstream pipe 54.
    In other words; this check valve 62 is configured to prevent fluid flow from the downstream pipe 54 to the upstream pipe 52.
    Preferably, as shown in Figure 4, the injector 32 further comprises an electric heater 64 for heating the anti-reflux device 62.
    This heating element 64 is configured to heat the anti-reflux device 56 during a starting phase of the internal combustion engine 12.
    To this end, the heating element 64 comprises an electrical resistance 66 placed near the art-reflux device 56 and a control unit 68 for supplying electrical current to the electrical resistance 66, the control unit 68 being configured to detect. a starting phase of the internal combustion engine 12 and supplying electric current to the electric resistance 66 when such a starting phase has been detected.
    In the example shown, the electrical resistance 66 surrounds the anti-reflux device 56 and in particular is positioned around the valve seat 70.
    As a variant, the electrical resistance 66 is positioned inside the anti-reflux device 56.
    This heating element 64 decomposes the salt formed by the reducing agent inside the anti-reflux device 56 which would deteriorate the sealing performance of the non-return valve 70 and block the injection line 38, and thus prevent the occurrence of deterioration in sealing performance or obstruction of the injection line 38.
    Besides; in the embodiment of FIG. 4, the upstream pipe 52 is configured to be heated during the working phases of the internal combustion engine 12.
    To this end; most of the upstream pipe 52 extends near the exhaust pipe 31 so that the upstream pipe 52 is heated by the exhaust pipe 31 by the exhaust gas flowing through said pipe 8 exhaust 31.
    By “heated” is meant that said part of the upstream pipe 52 is positioned relative to the exhaust pipe 31 so as to receive a radiated thermal power of at least 0.1 W per linear meter of upstream pipe 52 to from the exhaust pipe 31 when the exhaust gas flows through the pipe 31 is at a temperature greater than 120 ° C, said radiated thermal power preferably being greater than 2 W per linear meter of upstream pipe 52 .
    This radiated thermal power is usually calculated using Stefan-Boltzmann's law, for example, using thermal calculation software such as TAIT.herm from ThermoAnaiytics®. The proper position of the part of the upstream pipe 52 relative to the exhaust pipe 31 so that such heating can be provided depends on several factors, including the thermal insulation of the exhaust pipe 31.
    Those skilled in the art will be able to determine this appropriate position without difficulty, for example using computer-aided design. The embodiment of FIG. 5 differs from that of FIG. 4 in that the anti-reflux device 56 is positioned. inside the mixer 30.
    The downstream pipe 54 therefore consists of its internal portion 57A and does not include an external portion.
    Further, the check valve 62 is made of a material which withstands high temperatures (above 500g).
    Another difference is that, in the fourth embodiment, the injector 32 does not include an electric heating element for heating the asti-reflux device 62.
    By virtue of the aforementioned invention, obstruction of the injector 32 is prevented or at least significantly reduced.
    As a result, the downtime of the injector 32 is reduced.
    Although the features of the invention have been described in several embodiments, it should be understood that these embodiments can be combined with each other, and that the invention also extends to these combinations.
    For example, the anti-reflux device 56 can simultaneously comprise a throttle, at least one baffle and a non-return valve.
    Further, the upstream pipe 52 of the embodiments of Figures 2 and 3 can be configured to be heated during the working phases of the internal combustion engine 12 in the same way that the upstream pipe 52 of the embodiment of FIGS. figure 5.
    Further, although the injector 32 described here comprises a single injection nozzle 34, the invention is not limited to this single embodiment.
    In variants (not shown) of the invention, the injector 32 comprises several injection nozzles 34,
    权利要求:
    Claims (13)
    [0001]
    CLAIMS 1, Injector (32) for injecting a gaseous reducing agent into the exhaust gas stream of an internal combustion engine (12); the injector (32) comprising at least one injection nozzle (34), a metering system (36) for providing a metered flow of reducing agent to the or each injection nozzle (34); and an injection line (38) fluidly connecting the metering system (36) to the or each injection nozzle (34), characterized in that the injection line (38) comprises an upstream pipe (52 ) fluidly connected to the metering system (36), at least one downstream pipe (54) fluidly connected to the respective injection nozzle (34), and at least one anti-reflux device (56) to avoid or minimize the fluid flow from the or each downstream pipe (54) to the upstream pipe (52).
    [0002]
    2. An injector (32) according to claim 1, wherein the anti-reflux device (56) is configured to allow fluid flow from the upstream pipe (52) to the downstream pipe (54).
    [0003]
    3. An injector (32) according to claim 1 or 2, wherein the antireflux device (56) has at least one constriction (58) with a reduced flow section with respect to the downstream pipe (54).
    [0004]
    4. An injector (32) according to any preceding claim, wherein the anti-reflux device comprises at least one baffle (60)
    [0005]
    5. An injector (32) according to any preceding claim, wherein the anti-reflux device (56) comprises a non-return valve (62).
    [0006]
    6. An injector (32) according to any preceding claim, comprising a heating element (64) for heating the anti-reflux device (56). 7. An injector according to claim 6, wherein the heating element (56) is configured to heat the anti-reflux device (56) during a starting phase of the internal combustion engine (12). 8. An injector (32) according to any preceding claim, wherein the upstream pipe (52) is configured to be heated during the working phases of the internal combustion engine (12). 9. Exhaust pipe (10) for an internal combustion engine (12) comprising a mixer (30) configured to be traversed by a flow of exhaust gas produced by the internal combustion engine (12) and 10 15 20 11 the injector (32) of any preceding claim for injecting the reducing agent into said exhaust gas stream. 10. Exhaust pipe (10) according to claim 9, wherein the downstream pipe (54) extends from the injection nozzle (34) to the anti-reflux device (56) and comprises an external part (57B) s 'extending outside the mixer (30), said outer part (57B) having a length of less than 2 m and preferably less than 20 cm. 11. Exhaust pipe (10) according to claim 9 or 10, wherein the anti-reflux device (56) is located inside the mixer (30). 12. Exhaust pipe (10) according to any one of claims 9 to 11, comprising an exhaust pipe (31) for guiding the exhaust gas, at least partly from the upstream pipe (52) s' extending near said exhaust pipe (31) so that the upstream pipe (52) is heated by the exhaust pipe (31) by the exhaust gas flowing through said exhaust pipe (31) . 13. Motor vehicle comprising the exhaust pipe (10) according to any one of claims 9 to 12.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102009013260A1|2009-03-14|2010-09-16|Bayerische Motoren Werke Aktiengesellschaft|Device for selective catalytic nitrogen oxide reduction in waste gases containing oxygen, of internal combustion engine of motor vehicle, has heater heating fluid line upstream to injection position up to sediments decomposition temperature|
    FR2957630A1|2010-03-19|2011-09-23|Peugeot Citroen Automobiles Sa|Device for injecting gas in exhaust line for selective reduction of nitrogen oxides produced by internal combustion engine i.e. diesel engine, of vehicle, has tanks mounted on inlet pipe in serial manner|
    FR2974849A1|2011-05-02|2012-11-09|Peugeot Citroen Automobiles Sa|Exhaust line for diesel engine of thermal vehicle, has tube fixed by one of its ends at pipe, and non-return valve preventing increase of particles toward reservoir, where tube portion is placed in fiber insulation along pipe|
    EP2573348A1|2011-09-23|2013-03-27|Peugeot Citroën Automobiles Sa|Arrangement for supplying a reducing gas in the exhaust line of a combustion engine|
    WO2013072982A1|2011-11-14|2013-05-23|トヨタ自動車株式会社|Exhaust gas purification device for internal combustion engine|
    US20130199157A1|2012-02-02|2013-08-08|Cary Henry|Systems and methods for controlling reductant delivery to an exhaust stream|
    US20140041729A1|2012-08-10|2014-02-13|Faurecia Systemes D'echappement|Hybrid dosing unit|
    FR2994455A1|2012-08-10|2014-02-14|Faurecia Sys Echappement|SUPPLY ASSEMBLY FOR A GAS DOSE FLOW, ASSOCIATED METHOD, EXHAUST LINE OF A VEHICLE EQUIPPED WITH SUCH AN ASSEMBLY|
    WO2006136306A1|2005-06-22|2006-12-28|Eichenauer Heizelemente Gmbh & Co. Kg|Reducing agent supply system for an exhaust gas purifying catalytic converter and heating device therefor|
    US7497077B2|2006-07-26|2009-03-03|Southwest Research Institute|System and method for dispensing an aqueous urea solution into an exhaust gas stream|
    DE102009015419A1|2009-03-27|2010-09-30|Emitec Gesellschaft Für Emissionstechnologie Mbh|Method for supplying reducing agent into an exhaust system and corresponding exhaust system|
    DE102010024021A1|2010-06-16|2011-12-22|Emitec Gesellschaft Für Emissionstechnologie Mbh|Device for providing a reducing agent with system heating|
    DE102012023049A1|2012-11-26|2014-05-28|Volkswagen Aktiengesellschaft|SCR exhaust aftertreatment device and motor vehicle with such|
    JP6119723B2|2014-11-27|2017-04-26|トヨタ自動車株式会社|Exhaust gas purification device for internal combustion engine|US10920641B2|2019-04-05|2021-02-16|Faurecia Emissions Control Technologies, Usa, Llc|Automotive exhaust aftertreatment system with flash-boil doser|
    US11193413B2|2019-12-12|2021-12-07|Faurecia Emissions Control Technologies, Usa, Llc|Exhaust aftertreatment system with virtual temperature determination and control|
    US11022014B1|2020-04-28|2021-06-01|Faurecia Emissions Control Technologies, Usa, Llc|Exhaust aftertreatment system with heated flash-boiling doser|
    US11092054B1|2020-04-29|2021-08-17|Faurecia Emissions Control Technologies, Usa, Llc|Flash-boiling doser with thermal transfer helix|
    US11225894B1|2020-06-30|2022-01-18|Faurecia Emissions Control Technologies, Usa, Llc|Exhaust aftertreatment system with thermally controlled reagent doser|
    法律状态:
    2019-10-25| PLFP| Fee payment|Year of fee payment: 2 |
    2020-05-01| PLSC| Publication of the preliminary search report|Effective date: 20200501 |
    2020-10-26| PLFP| Fee payment|Year of fee payment: 3 |
    2021-09-21| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1859921A|FR3087836B1|2018-10-26|2018-10-26|INJECTOR FOR INJECTING A GAS REDUCING AGENT INTO AN EXHAUST GAS FLOW, INCLUDING AT LEAST ONE ANTI-REFLUX DEVICE|FR1859921A| FR3087836B1|2018-10-26|2018-10-26|INJECTOR FOR INJECTING A GAS REDUCING AGENT INTO AN EXHAUST GAS FLOW, INCLUDING AT LEAST ONE ANTI-REFLUX DEVICE|
    US16/662,174| US11111835B2|2018-10-26|2019-10-24|Injector for injecting a gaseous reducing agent into an exhaust gas stream, comprising at least one anti-backflow device|
    DE102019128925.4A| DE102019128925A1|2018-10-26|2019-10-25|Injection device for injecting a gaseous reducing agent into an exhaust gas flow, with at least one backflow protection device|
    CN201911020098.6A| CN111102044B|2018-10-26|2019-10-25|Injector for injecting a gaseous reducing agent into an exhaust gas flow|
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