• 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 injector (32) comprises an injection nozzle (34), a dosing system (36) for providing a dosed flow of the reducing agent to the injection nozzle, and an injection line (38) connecting the dosing system (36) to the injection nozzle (34). The injector (32) comprises heating means arranged to heat at least a part of the injector (32).
    公开号:DK201970655A1
    申请号:DKP201970655
    申请日:2019-10-21
    公开日:2020-06-02
    发明作者:Jeannerot Thibaut；Hansen Jorn；Ottaviani Eric；Poinsot Laurent
    申请人:Faurecia Systemes D'echappement；
    IPC主号:
    专利说明:

    An injector for injecting a gaseous reducing agent into an exhaust gas stream of an internal combustion engine
    The present invention concerns an injector for injecting a gaseous reducing agent into the exhaust gas stream of an internal combustion engine.
    The invention further concerns an exhaust line for an internal combustion engine comprising such an injector, and an automotive vehicle comprising such an exhaust line.
    The reducing agent comprises for example ammonia, a mix of air and ammonia, or a mix of ammonia and neutral gas such as helium.
    The internal combustion engines of automotive vehicles are known for producing nitrogen oxides also referred to as “NOx”. These can be a can be a significant source of air pollution as they contribute to the formation of smog and acid rain, and affect tropospheric ozone. Thus, it is desirable to eliminate NOx contained in the exhaust gas of these engines.
    To that end, it has been developed a method known as “Selective Reduction Catalyst” (SCR), wherein ammonia is used for reducing NOx into harmless nitrogen. The most common manner of implementing this method consists in injecting into the exhaust line a liquid urea agent that will be mixed with the exhaust gas and subjected to thermalhydrolysis to transform into ammonia, before the mix of exhaust gas and ammonia goes through a SCR catalyst wherein the ammonia reduces the NOx into nitrogen.
    However, it has been found out that it is much more effective to inject directly ammonia into the exhaust line, upstream of the SCR catalyst, rather than the abovementioned liquid urea agent. This way, the first step mentioned above is eliminated.
    This observation has led to the development of injectors of the above-mentioned type, which are known for instance from FR 2 994 455. These injectors are commonly used in replacement of the injectors of liquid urea agent.
    However, these known injectors are not entirely satisfactory. Indeed, it has been found out that, at starting of the injection of ammonia, ammonia salts can disturb the proper functioning of the injector. For instance, the injection nozzles of these injectors are usually clogged by ammonia salts, so that ammonia cannot be injected into the mixer. Several hours are needed before the injection nozzle is unclogged and the injector can work. In the meantime, the exhaust gas cannot be depolluted.
    An aim of the invention is therefore to prevent the formation of salts formed by the reaction between the reducing agent and water and/or carbon dioxide, or to unclog the injector rapidly when required and then reduce the time before an injector of the type mentioned above is effective after starting of the engine.
    DK 2019 70655 A1
    To this end, the invention relates to an injector for injecting a reducing agent into an exhaust gas stream of an internal combustion engine, the injector comprising an injection nozzle, a dosing system for providing a dosed flow of the reducing agent to the injection nozzle, and an injection line connecting the dosing system to the injection nozzle, characterized in that the injector comprises heating means arranged to heat at least a part of the injector.
    In this specification, the wording “heating means” is directed to any means favoring the heating.
    Such heating means can be active or passive. More particularly, active heating means emit heat, and passive heating means are intended to prevent a heat loss.
    The salts formed by the reaction between the reducing agent, water and carbon dioxide are created in cold conditions, and they disappear in hot conditions. Thus, the heating means are intended to accelerate the ammonia salts decomposition, and/or to prevent or to reduce the creation of ammonia salts.
    An injector according the invention can comprise any of the following features, alone or in any possible combination.
    - The heating means comprise an heat exchanger arranged around the injection line, the heat exchanger comprising a thermal fluid circulating in a thermal circuit arranged to take calorie from an heating source, the heating source being for instance a second heat exchanger taking heat from the engine or from an exhaust gas.
    - The heating means comprise a heating element, for instance an electrical heating element, more particularly a heating resistance, arranged close to the injection line, preferentially close to the injection nozzle.
    - The heating means comprise a heating element arranged inside the injection line, for instance a heating wire, and/or a heating element arranged inside the injection nozzle.
    - The heating means comprise a heating element arranged around the injection line, for instance a heating wire wrapped around at least a part of the injection line.
    - The heating means comprise an isolating sleeve surrounding at least a part of the injection line.
    - The heating means comprise a heat shield arranged close to the injection line, preferentially with an air gap between the exhaust line and the injection line.
    - The heating means comprise a thickened nozzle, said thickened nozzle comprising an inner part extending inside the exhaust gas stream and an outer part extending outside the exhaust gas stream, the inner part and/or the outer part having a thickness higher than 2 mm.
    DK 2019 70655 A1
    - The injection line is made of a first material and the thickened nozzle is made of a second material, the thermal conductivity of the second material being higher than the thermal conductivity of the first material.
    - The heating means comprise a chemical heater, arranged in the injection line or 5 around the injection line.
    - The injection line comprises a long portion, conformed to extend in a warm area inside the exhaust line or outside the exhaust line.
    - The injection line comprises a check valve preventing backflow from the exhaust line towards the injection line, the heating means comprising an heating element arranged in the check valve.
    The invention also relates to an exhaust line for an internal combustion engine comprising a mixer configured to be crossed by an exhaust gas stream produced by the internal combustion engine and the injector disclosed above for injecting the reducing agent into said exhaust gas stream.
    The invention also relates to an automotive vehicle comprising the exhaust line.
    Other features and advantages of the invention will become apparent from a detailed description which is given thereof below, as an indication and by no means as a limitation, with reference to the appended figures, wherein:
    Figure 1 is a general scheme of an exhaust line according to the invention,
    Figure 2 is a cross-section view of a section according to a fist embodiment of the invention,
    Figure 3 is a cross-section view of a section according to a second embodiment of the invention,
    Figure 4 is a cross-section view of a section according to a third embodiment of the invention,
    Figure 5 is a cross-section view of a section according to a fourth embodiment of the invention,
    Figure 6 is a cross-section view of a section according to a fifth embodiment of the invention,
    Figure 7 is a cross-section view of a section according to a sixth embodiment of the invention,
    Figure 8 is a cross-section view of a section according to a seventh embodiment of the invention,
    Figure 9 and 10 are cross-section views of a section of the exhaust line of Figure 1, according to two variants of a ninth embodiment of the invention, of of of of of of of the the the the the the the exhaust exhaust exhaust exhaust exhaust exhaust exhaust line line line line line line line of of of of of of of
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    DK 2019 70655 A1
    Figure 11 is a cross-section view of a section of the exhaust line of Figure 1, according to a tenth embodiment of the invention.
    The exhaust line 10 shown in Figure 1 is part of combustion engine 12, for instance of an automotive vehicle.
    This exhaust line 10 conducts an exhaust gas stream generated by the engine 12 through various upstream exhaust components 14 to reduce emission and control noise as known. The various upstream exhaust components 14 can include one or more of the following: pipes, filters, valves, catalysts, mufflers etc.
    In the example configuration, the exhaust line 10 comprises a diesel oxidation catalyst (DOC) 16 having an inlet 18 and an outlet 20 positioned downstream of the upstream exhaust components 14, so that these upstream exhaust components 14 direct engine exhaust gases into the DOC 16.
    In the shown example, the exhaust line 10 further comprises a diesel particulate filter (DPF) 21 positioned downstream of the DOC 16. This DPF is able to remove contaminants from the exhaust gas as known.
    The exhaust line 10 also comprises a selective catalytic reduction (SCR) catalyst 22 having an inlet 24 and an outlet 26, and downstream exhaust components 28 positioned downstream of the SCR catalyst 22. This SCR catalyst 22 is here positioned downstream of the DOC 16 and of the optional DPF 21.
    Optionally, the SCR catalyst 22 can comprise a catalyst that is configured to perform a selective catalytic reduction function and a particulate filter function.
    The various downstream exhaust components 28 include for instance one or more of the following: pipes, filters, valves, catalysts, mufflers etc.
    The upstream 14 and downstream 28 components can be mounted in various different configurations and combinations dependent upon vehicle application and available packaging space.
    The exhaust line 10 further comprises, upstream of the inlet 24 of the SCR catalyst 22, a mixer 30 configured to be crossed by the exhaust gas stream before it enters the SCR catalyst 22. This mixer 30 is here positioned downstream from the outlet 20 of the DOC 16 and of the optional DPF 21.
    The mixer 30 is preferably configured to generate a swirling or rotary motion of the exhaust gas stream. Alternatively, the mixer 30 consists of a simple pipe.
    The exhaust line 10 also comprises an injector 32 intended to inject a reducing agent into the exhaust gas stream into the mixer 30 so that the mixer 30 can mix the reducing agent and exhaust gas thoroughly together.
    DK 2019 70655 A1
    The reducing agent comprises for example ammonia, a mix of air and ammonia, or a mix of ammonia and neutral gas such as helium.
    The injector 32 includes an injection nozzle 34 positioned within the mixer 30 to direct injected reducing agent into the mixer 30 to mix with the engine exhaust gas, a dosing system 36 for providing a dosed flow of reducing agent to the injection nozzle 34, and an injection line 38 connecting the dosing system 34 to the injection nozzle 32.
    The dosing system 36 comprises a source of reducing agent 40, a dosing valve 42 for dosing the quantity of reducing agent provided to the injection nozzle 34, and a controller 44 for controlling the dosing valve 32 so as to control dosing of the reducing agent as known.
    The source of reducing agent 40 here consists of an ammonia source. This source typically comprises a tank (not shown) in which gaseous ammonia is stored under pressure. In variant, the source comprises urea or strontium chloride (SrCl2) salts intended to be heated to generate ammonia.
    In order to accelerate the ammonia salts decomposition, and/or to prevent or to reduce the creation of ammonia salts, the injector 32 comprises heating means. Indeed, the ammonia salts are created in cold conditions, and are decomposed in hot conditions.
    Thus, the heating means are intended to heat the injection line 38 so that the ammonia salts be decomposed as soon as possible when the engine 12 is used.
    As specified before, the wording “heating means” is directed to any means favoring the heating. Such heating means can be active or passive. More particularly, active heating means emit heat, and passive heating means are intended to prevent a heat loss.
    Some examples of heating means will be now described, in reference of Figures 2 to 10.
    It should be noticed that these heating means are only examples, so it may be possible to consider other heating means.
    Besides, the hereafter disclosed heating means are not exclusive to each other. So, any combination of several heating means can be considered.
    A first example of heating means is shown on Figure 2.
    In this first embodiment, the heating means comprise a first heat exchanger 46 arranged around the injection line 38. Such a first heat exchanger 46 is an active heating mean.
    The first heat exchanger 46 comprises a thermal fluid 48 circulating in a thermal circuit 50 arranged to take calorie from a heating source 52, via a second heat exchanger 54.
    DK 2019 70655 A1
    The heating source 52 is a hot element of the vehicle, for instance the engine 12 or the exhaust line in which an exhaust gas circulate. Indeed, the exhaust gas can reach a very high temperature (more than 350°C) in a short time. Thus, in this first example, the heating means heat the injection line 38, and the ammonia salts that are in this injection line 38, in a short time after the engine 12 is turned on.
    It should be noticed that the first heat exchanger 46 can surround the entire injection line 38, from the dosing unit 36 to the injection nozzle 34, thus it can decompose ammonia salts anywhere in this injection line 38.
    Besides, this embodiment has the advantage that the heat is taken from the hot surrounding environment, thus there is no need of an additional energy consuming device.
    The thermal fluid 48 can be any thermal fluid, for instance a gas or a liquid.
    In a variant, the thermal fluid is an engine cooling liquid also used to cool the engine
    12. This can be an advantage since the engine cooling system has a regulated temperature around 80°C.
    A second example of heating means is shown on Figure 3.
    In this second embodiment, the heating means comprise a heating element 56, for instance an electrical heating element, more particularly a heating resistance, arranged close to the injection line 38, preferentially close to the injection nozzle 34.
    In a variant, the heating element 56 is arranged inside the injection line 38, preferentially inside the injection nozzle 34.
    Such a heating element 56 is an active heating mean.
    Such a heating element 56 allows a local heating of the injection line 38, out of the exhaust line where clog 58 is likely to be present.
    It should be noticed that the heating means can comprise a plurality of such heating elements 56 disposed along the injection line 38.
    Such a heating element 56 allows a fast and efficient localized heating, which could accelerate salt decomposition.
    In case of an electrical heating element 56, this electrical heating element 56 can be activated only when it is needed.
    The electrical heating element 56 is fed by a battery, for instance a battery of the vehicle, via an alimentation cable 60.
    Alternatively, the electrical heating element 56 can be fed by an electric energy source independent from the battery of the vehicle, so as to be able to be activated even when the vehicle is off. For instance, the electrical heating element 56 is driven by a command device that comprises a thermometer and that is configured to active the electrical heating element 56 when the temperature in the injection line 38 is under a
    DK 2019 70655 A1 predefined threshold. This allows preventing the formation of ammonia salt since the injection line 38 never falls in the cold condition.
    Alternatively, the command device is time programmable, and can be configured to activate the heating element 56 at a predetermined time. This allows decomposition of the ammonia salts shortly before use of the vehicle.
    Alternatively, the command device can be manually activated, so that the user activates the heating element 56 when needed.
    It also should be noticed that such an heating element 56 can be regulated in temperature, so that it heats only at a needed temperature.
    A third example of heating means is shown on Figure 4.
    In this third embodiment, the heating means comprise a heating element 62 arranged inside the injection line 38. For instance, the heating element 62 is a heating wire.
    Such a heating element 62 is an active heating mean.
    Such a heating wire 62 can expand in the entire injection line 38, from the dosing unit 36 to the injection nozzle 34.
    Such a heating element 62 allows a fast and efficient localized heating, which could accelerate salt decomposition or prevent its formation.
    In case of an electrical heating element 62, this electrical heating element 62 can be activated only when it is needed.
    The electrical heating element 62 is fed by a battery, for instance a battery of the vehicle.
    Alternatively, the electrical heating element 62 can be fed by an electric energy source independent from the battery of the vehicle, so as to be able to be activated even when the vehicle is off. For instance, the electrical heating element 62 is driven by a command device that comprises a thermometer and that is configured to active the electrical heating element 62 when the temperature in the injection line 38 is under a predefined threshold. This allows preventing the formation of ammonia salt since the injection line 38 never falls in the cold condition.
    Alternatively, the command device is time programmable, and can be configured to activate the heating element 62 at a predetermined time. This allows decomposition of the ammonia salts shortly before use of the vehicle.
    Alternatively, the command device can be manually activated, so that the user activates the heating element 62 when needed.
    It also should be noticed that such a heating element 62 can be regulated in temperature, so that it heats only at a needed temperature.
    DK 2019 70655 A1
    A fourth example of heating means is shown on Figure 5.
    This fourth embodiment is similar as the third embodiment, except that a heating mean 64 is arranged outside the injection line 38, for instance the heating mean 64 is wrapped around this injection line 38.
    For example, in this embodiment, the heating mean 64 is a wire, a heating hose or a heating sleeve.
    The functioning of the device according the fourth embodiment is similar as the functioning of the device according the third embodiment, thus it will not be described again.
    A fifth example of heating means is shown on Figure 6.
    In this fifth embodiment, the heating means comprise an isolating sleeve 66 surrounding at least a part of the injection line 38.
    Such an isolating sleeve 66 is a passive heating means. It allows the injection line 38 to keep thermal energy during a longer time, and also it allows the injection line 38 to heat faster when in operation.
    It should be noted that the injection line 38 is for instance heated by the exhaust line 52. More particularly, the heat spreads by conduction from the exhaust line 30 in the injection line 38. Alternatively, the injection line 38 is heated by any other heating means.
    Since the thermal energy is kept in the injection line 38, the formation of ammonia salts is slower when the engine 12 is not in operation. Besides, since the injection line 38 is heated faster when the engine 12 is in operation, the possible ammonia salts are decomposed faster.
    The isolation sleeve 66 may be realized in any suitable material such as fiberglass mat.
    A sixth example of heating means is shown on Figure 7.
    In this sixth embodiment, the heating means comprise a heat shield 68 arranged close to the injection line 38, preferentially with an air gap 70 between the heat shield 68 and the injection line 38.
    The heat shield 68 (with air gap 70) is arranged around the nozzle 34 and/or at least a part of the injection line 38, to keep thermal energy, favor heating and prevent cooling from external convection while driving.
    The objective is to limit the cooling convection effect around the injection line 38 due to the vehicle movement. This will help to keep the heat from the beginning of the driving phase where there is salt 58 in the injection line 38, in order to decompose it and enable NH3 injection.
    DK 2019 70655 A1
    Moreover, having a protected air gap between the exhaust line 30 and the injection line 38 from cooling convection while driving, helps the heat exchange by convection and radiation from the exhaust line 30 towards the injection line 38.
    In a seventh embodiment, shown on figure 8, the heating means comprise a thickened nozzle 34.
    The thickened nozzle 34 comprises an inner part 34a extending inside the exhaust gas stream and an outer part 34b extending outside the exhaust gas stream.
    Preferably, the length of outer part 34b is comprised between 2 cm and 10 cm, for example 5 cm.
    The inner part 34a and/or the outer part 34b have a thickness higher than 2 mm. For example, the thickness is lower than 10 mm, preferably the thickness is comprised between 2 mm and 8 mm, more preferably comprised between 4 mm and 6 mm.
    The thickness of the outer part 34b and the thickness of the inner part 34a may be different.
    Advantageously, the injection line 38 is made of a first material, and the injection nozzle 34 is made of a second material.
    Preferentially, the thermal conductivity of the second material is higher than the thermal conductivity of the first material.
    For example, the second material is steel.
    Thus, the thickened nozzle 34 allows a good heat conduction from the exhaust line 30 towards the injection line 38, so as to heat rapidly the parts where salts are formed in order to decompose them and enable the availability of the reducing agent injection.
    Moreover, when the engine is stopped, the thickened nozzle 34 remains hot and then delays the formation of potential salts in this nozzle 34.
    In an eighth embodiment, the heating means comprise a chemical heater, arranged in the injection line 38 or around the injection line 38. The chemical heater comprises a substance, when it is activated, produces an exothermic phenomenon.
    For instance, the chemical heater is of the crystallization type, from the same technology as reusable hand warmer.
    After activation, the chemical heater is reset by the ambient heat, by conduction and/or convection from the exhaust gas. Then, at next engine start, the heater can be activated and release the heat.
    A ninth example of heating means is shown on Figures 9 and 10.
    In the ninth embodiment, the injection line 38 comprises a long portion 72, conformed to be disposed in a warm area 74 at proximity of the exhaust line 30.
    DK 2019 70655 A1
    This long portion 72 can be arranged outside the exhaust line 30 (Figure 9) or, in a variant, inside the exhaust line 30 (Figure 109).
    The length of the long portion 72 is preferably comprised between 10 cm and 2 m, more preferably between 30 cm and 2 m.
    For example, to increase the length of the portion 72 in the warm area 74, the portion 72 is wrapped around the exhaust line 30.
    The warm area 74 is preferentially the warmest area near the exhaust line 30. Alternatively, all the area near the exhaust line 30 can be considered as a warm area.
    By “near”, it is meant that the distance between the portion 72 and the exhaust line 30 is lower than 10 cm.
    The use of a long portion 72 in the warm area 74 allows keeping the residual gases in this potion 72 warm. This also allows reducing the quantity of CO2 and H2O in the cold zone (BackFlow limitation).
    Thus, the formation of ammonia salts is reduced.
    This long portion 72 forms a passive heating mean.
    A tenth example of heating means is shown on Figure 11.
    In this tenth embodiment, the injection line 38 comprises a check valve 76 preventing backflow from the exhaust line 30 towards the injection line 38.
    Preferentially, the heating means comprise a heating element 78 arranged in the check valve 76.
    Using a heated check valve 76 allows heating the area around the valve 76 for ammonia injection, and prevents backflow of exhaust gas in the injection line. Thus, thanks to the heated valve, there will be no ammonia salts clogging in and upstream the check valve 76.
    It should be noted that other heating means can be considered. Besides, any combination of heating means, as disclosed previously or not disclosed, can be considered.
    权利要求:
    Claims (14)
    [1] 1. An injector (32) for injecting a reducing agent into an exhaust gas stream of an internal combustion engine (12), the injector (32) comprising an injection nozzle (34), a dosing system (36) for providing a dosed flow of the reducing agent to the injection nozzle, and an injection line (38) connecting the dosing system (36) to the injection nozzle (34), characterized in that the injector (32) comprises heating means arranged to heat at least a part of the injector (32).
    [2] 2. The injector (32) of claim 1, wherein the heating means comprise an heat exchanger (46) arranged around the injection line (38), the heat exchanger comprising a thermal fluid (48) circulating in a thermal circuit (50) arranged to take calorie from an heating source (54), the heating source (54) being for instance a second heat exchanger taking heat from the engine (12) or from an exhaust gas.
    [3] 3. The injector (32) of claim 1 or 2, wherein the heating means comprise a heating element (56), for instance an electrical heating element, more particularly a heating resistance, arranged close to the injection line (38), preferentially close to the injection nozzle (34).
    [4] 4. The injector (32) of any of preceding claims, wherein the heating means comprise a heating element (62) arranged inside the injection line, for instance a heating wire, and/or a heating element (62) arranged inside the injection nozzle (34).
    [5] 5. The injector (32) of any of preceding claims, wherein the heating means comprise a heating element (64) arranged around the injection line (38), for instance a heating wire wrapped around at least a part of the injection line (38).
    [6] 6. The injector (32) of any of preceding claims, wherein the heating means comprise an isolating sleeve (66) surrounding at least a part of the injection line (38).
    [7] 7. The injector (32) of any of preceding claims, wherein the heating means comprise a heat shield (68) arranged close to the injection line (38), preferentially with an air gap (70) between the exhaust line (30) and the injection line (38).
    DK 2019 70655 A1
    [8] 8. The injector (32) of any of preceding claims, wherein the heating means comprise a thickened nozzle (34), said thickened nozzle comprising an inner part (34a) extending inside the exhaust gas stream and an outer part (34b) extending outside the exhaust gas stream, the inner part and/or the outer part having a thickness higher than 2 mm.
    [9] 9. The injector according to claim 8, wherein the injection line (38) is made of a first material and the thickened nozzle (34) is made of a second material, the thermal conductivity of the second material being higher than the thermal conductivity of the first material.
    [10] 10. The injector (32) of any of preceding claims, wherein the heating means comprise a chemical heater, arranged in the injection line or around the injection line.
    [11] 11. The injector (32) of any of preceding claims, wherein the injection line (38) comprises a long portion (72), conformed to extend in a warm area (74) inside the exhaust line (30) or outside the exhaust line (30).
    [12] 12. The injector (32) of any of preceding claims, wherein the injection line (38) comprises a check valve (76) preventing backflow from the exhaust line (30) towards the injection line (36), the heating means comprising an heating element (78) arranged in the check valve (76).
    [13] 13. An exhaust line for an internal combustion engine (12) comprising a mixer configured to be crossed by an exhaust gas stream produced by the internal combustion engine and the injector (32) of anyone of the previous claims for injecting the reducing agent into said exhaust gas stream.
    [14] 14. An automotive vehicle comprising the exhaust line of claim 13.
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    同族专利:
    公开号 | 公开日
    FR3087834A1|2020-05-01|
    FR3087834B1|2021-05-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1691046B1|2003-09-19|2013-04-24|Nissan Diesel Motor Co., Ltd.|Exhaust emission purification apparatus for an internal combustion engine|
    DE102006060314A1|2006-12-20|2008-06-26|Robert Bosch Gmbh|Device for conveying fluid media at low temperatures|
    DE102007022678A1|2007-05-11|2008-11-13|Hydraulik-Ring Gmbh|Ammonia based exhaust gas re-treatment unit feeds gaseous ammonia directly into exhaust gas flow of internal combustion, preferably diesel, engine; exhaust gas flows through exhaust tract free of urea-water vapor and urea-water solution|
    US7966811B2|2007-11-30|2011-06-28|Perkins Engines Company Limited|Exhaust treatment system having a diverter valve|
    US8122710B2|2008-12-01|2012-02-28|International Engine Intellectual Property Company, Llc|Thermal management of urea dosing components in an engine exhaust after-treatment system|
    FR2974848A1|2011-05-02|2012-11-09|Peugeot Citroen Automobiles Sa|Exhaust line for use with nitrogen oxide selective catalytic reduction system in diesel engine of thermal vehicle, has non-return valve preventing increase of particles toward reservoir, and heat exchanger placed around valve to heat valve|
    FR2994453B1|2012-08-08|2014-09-05|Snecma|LOW WEAR ASSEMBLY FOR AIRBORNE TURBOMACHINE AIRBORNE STATOR CURVED CROWN|
    FR3022582B1|2014-06-19|2016-07-01|Peugeot Citroen Automobiles Sa|CATALYTIC SELECTIVE REDUCTION SYSTEM HAVING INSERT HEATER ON ITS INJECTOR|
    US10513960B2|2014-12-25|2019-12-24|Volvo Truck Corporation|Exhaust purification device for engine|
    WO2018178849A1|2017-03-28|2018-10-04|Johnson Matthey Public Limited Company|Egr urea hydrolysis|
    法律状态:
    2020-06-02| PAT| Application published|Effective date: 20200427 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1859919A|FR3087834B1|2018-10-26|2018-10-26|INJECTOR FOR INJECTING A GAS REDUCING AGENT INTO A FLOW OF EXHAUST GAS FROM AN INTERNAL COMBUSTION ENGINE|
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