• 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 invention relates to an injection arrangement (7) for injection of a reducing agent into an exhaust line (3) of a combustion engine (2). The injection arrangement (7) comprises an injection unit (10) in the form of a housing (18, 19) and a piston member (21) dividing an inner space of the housing in a first chamber (23) and a second chamber (24). The injection arrangement (7) comprises at least one flow channel (25a, 25b) allowing a reducing agent flow with a specific pressure drop between the first chamber (23) and the second chamber (24), and a valve member (13) arranged in a return line (14) which in an open position creates a first ratio between the pressures in the first chamber (23) and in the second chamber (24) at which the piston member (21) is moved to a first position in which injection of reducing agent via the orifice (20) is prevented and which in a closed position creates a second ratio between the pressures in the first chamber (23) and in the second chamber (24) at which the piston member (21) is moved to a second position in which the injection of reducing agent via the orifice (20) is allowed
    公开号:SE1651197A1
    申请号:SE1651197
    申请日:2016-09-07
    公开日:2018-03-08
    发明作者:Rosvall Esa
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    An injection arrangement for injection of a reducing agent into an exhaust line of a combustion engine BACKGROUND OF THE INVENTION AND PRIOR ART The invention relates to an injection arrangement for injection of a reducing agent into an eXhaust line of a combustion engine according the preamble of claim 1.
    One Way of reducing emissions of nitrogen oXides from diesel engines is to use atechnique called SCR (selective catalytic reduction). This involves a reducing agent inthe form of a urea solution being supplied in a specific dose to the eXhaust gases in theeXhaust passage of a diesel engine. When the urea solution is sprayed into the exhaustpassage, the resulting finely divided solution becomes evaporated in contact With thehot exhaust gases so that ammonia is formed. The mixture of ammonia and eXhaustgases is then led through an SCR catalyst in Which the nitrogen in the nitrogen oXidesin the eXhaust gases reacts With the nitrogen in the ammonia to form nitrogen gas. Theoxygen in the nitrogen oXides reacts With the hydrogen in the ammonia to form Water.The nitrogen oXides in the exhaust gases are thus reduced in the catalyst to nitrogengas and Water vapor. With correct dosage of urea solution, the emissions of nitrogen oxides can be greatly reduced.
    The urea solution can be supplied to the eXhaust gases by means of an injection unitWhich injects the urea solution in finely divided form to an inner space of an eXhaustline. HoWever, the temperature of the eXhaust gases decreases With the distance fromthe combustion engine. A high eXhaust gas temperature accelerates the evaporationprocess of the urea solution and favors the reduction of nitrogen oXides in the eXhaustgases. ln an eXhaust passage With a turbine of a turbocharger, the most favorableposition of the injection unit is immediately doWnstream of the turbine. HoWever, inthis position, the injection unit is exposed to very high exhaust temperatures andvibrations from the combustion engine. Due to this fact, it is common to mount theinjection unit in a more protected position in the eXhaust line. The injection unit may,for example, be applied in a silencer Which may be arranged at a relatively long distance from the combustion engine and the turbine.
    WO 2015/005799 shows a device for metering reducing agent to the exhaust gases of a combustion engine. The device comprises an injector to Which reducing agent is supplied by a pump from a reservoir. The injector has a sea1ing seat and a movingp1unger that, When 1ifting from the sea1ing seat, enab1es a flow of reducing agent to theeXhaust gas. The p1unger is 1ifted from the sea1ing seat by a pressure of the reducing agent against the action of a spring.
    SUMMARY OF THE INVENTION The object of the present invention is to provide an injection arrangement comprisingan injection unit having a simple and robust design such that it can be arranged in aposition in which it is exposed to eXtreme temperatures and vibrations at the same timeas sensib1e components of the injection arrangement can be arranged at a distance from the injection unit.
    This object is achieved by the device defined in the characterizing part of c1aim 1. Theinjection unit comprises a housing with an orifice and a piston dividing an inner spaceof the housing in a first chamber and a second chamber. Such an injection unitcomprises very few inc1uding parts. Said parts can be given a very robust designmaking it is possib1e to arrange the injection unit very c1ose to combustion engine. Thepressure drop in the flow channe1 between the first chamber and the second chamberresu1ts in different pressures in the first chamber and the second chamber. The pressureratio between the first chamber and the second chamber and the movement of thepiston member is contro11ed in a simp1e manner by a va1ve member in the return 1ine.When the va1ve member is in an open position, a pressure ratio is created between thefirst chamber and the second chamber at which the piston member is moved to a firstposition in which it prevent injection of the reducing agent. When the va1ve member isin a c1osed position, a pressure ratio is created between the first chamber and thesecond chamber at which the piston member is moved to a second position in which ita11ows injection of the reducing agent. The va1ve member can be arranged in a suitab1eposition of a return 1ine at a distance from the injection unit where it is not exposed tohigh temperatures from the eXhaust gases and vibrations from the combustion engine.The above mentioned design makes it possib1e to inject the reducing agent into theeXhaust passage in a position where the eXhaust gases substantia11y a1ways has a hightemperature at the same time as more sensib1e components such as the va1ve membercan be arranged in a more protected position . The high temperature of the eXhaustgases acce1erates the vaporization process of the reducing agent and increases the capacity to reduce the emissions of nitrogen oXides in the eXhaust gases.
    According to an embodiment of the invention, the injection arrangement comprises atleast two flow channels allowing a reducing agent flow with a specific pressure dropbetween the first chamber and the second chamber. When reducing agent not isinjected, the main part of the reducing agent flow entering the first chamber is directedto the return line. However, a small part of the reducing agent flow entering the firstchamber will be directed into the second chamber via one of said flow channels anddirected back to the first chamber via the other flow channel. This reducing agent flowensures that the second chamber continuously receives fresh reducing agent of arelatively low temperature cooling the components of the injection unit. Furthermore,this flow prevents accumulation of reducing agent at a very high temperature in the second chamber.
    According to an embodiment of the invention, said at least one flow channel eXtendsthrough the piston. Such a flow channel may have a very simple design. The crosssectional area of the flow channel may define pressure drop for the reducing agent when it flows between the first chamber and the second chamber.
    According to an embodiment of the invention, the piston member comprises a firstarea in contact with the reducing agent in the first chamber and a second area incontact with the reducing agent in the second chamber, wherein the second area islarger than the first area. The product of the pressure in the first chamber and the firstarea defines a force acting on the piston which tends to move the piston to the firstposition. The product of the pressure in the second chamber and the second areadefines a force acting on the piston, which tends to move the piston to the secondposition. When the valve member is in an open position, the pressure in the secondchamber will be considerable lower than the pressure in the first chamber. When thevalve member is in a closed position, the pressure in the second chamber will besomewhat lower than the pressure in the first chamber. Since the pressure in thesecond chamber never is higher than in the first chamber, the second area has to belarger than the first area in order to provide a movement of the piston member to the second position.
    According to an embodiment of the invention, the orifice is designed such that thereducing agent receives a larger pressure drop when it flow through the orifice than when it flows from said flow channel between the first chamber and the second Chamber. The larger pressure drop in the orifice maintains the pressure in the secondchamber such that the piston member not Will be moved from the second position to the first position during in injecting process of the reducing agent in the eXhaust gases.
    According to an embodiment of the invention, the housing comprises a first housingportion comprising the orifice and a second housing portion and that said housingportions in a connected state form an inner space for the piston member. ln order tomake it possible to introduce the piston member in a substantially closed inner space ahousing, the housing may include two housing portions, Which in a connected enclosesthe piston in an inner space. The second housing portion may be annular. ln this case,the second housing portion may have an outer periphery arranged in contact With aninner surface of the first housing portion. The central hole of the second housing portion may form a support for a portion of the piston member.
    According to an embodiment of the invention, the second housing portion maycomprise an inlet channel through Which reducing agent is directed from the inlet lineto the first chamber and a return channel through Which reducing agent is directedfrom the first channel to the return line. Such a design of the second housing portionmakes it easy to connect an inlet line and an outlet line to the first chamber. Thesecond housing portion may comprise a rear portion of the housing and the first housing portion may comprise a front portion of the housing including the orifice.
    According to an embodiment of the invention, the piston member comprises a frontportion configured to close the orifice in the first position and eXpose the orifice in thesecond position. The front portion of the piston member may have a correspondingshape as the orifice. In this case, the injection arrangement does not need to beprovided With a specific component above the piston member for closing and opening of the orifice.
    According to an embodiment of the invention, the piston member comprises a pistonportion dividing the first chamber from the second chamber. The piston portion has thelargest diameter of the piston member. An outer periphery surface of the piston portionmay be slidably connected to an inner surface of the housing. The piston member maycomprise a shaft portion to be in slidable contact With the housing. The shaft portion and the housing may define a path of movement of the piston member.
    According to an embodiment of the invention, the Valve member is a solenoid valve.Such a valve member can be switched very quickly between an open position and aclosed position. Such properties of the valve member facilitate the dosing of thereducing agent. The valve member may be controlled by a control unit. The controlunit may receive information about parameters such as the temperature and the flowrate of eXhaust gases in the eXhaust line. In view of this information, the control unitmay determine if reducing agent is to be injected or not. Furthermore, it may calculatea suitable dose of the reducing agent to be injected into the eXhaust gases. The controlunit may control the valve member and the injection of the reducing agent into theeXhaust gases by means of this information. The control unit may also control the pump in order to provide a suitable reducing agent flow rate to the first chamber.
    According to an embodiment of the invention, the injection arrangement comprises atank from which reducing agent is directed to the first chamber via the inlet line and towhich reducing agent is returned from the first chamber, via the retum line, when thevalve member is in an open position. Consequently, there is a continuously reducingagent flow to and from the tank when the valve member is in an open position and no reducing agent is injected into the eXhaust gases.
    According to an embodiment of the invention, the reducing agent is a urea solution.When the urea solution is injected into the eXhaust passage, it becomes evaporated incontact with the hot eXhaust gases so that ammonia is formed. The miXture ofammonia and exhaust gases is led to an SCR catalyst in which nitrogen oXides in theeXhaust gases are reduced. A correct dosage of the urea solution results in an effective reduction of nitrogen oXides in the eXhaust gases.
    BRIEF DESCRIPTION OF THE DRAVVINGS In the following a preferred embodiment of the invention is described with reference to the attached drawings, on which: Fig. l shows an eXhaust gas passage of a combustion engine including an injectionarrangement according to the invention,Fig. 2 shows a longitudinal sectional view of the injection unit in Fig. l in a no injecting position, Pig. 3 shows a longitudinal sectional view of the injection unit in Pig. 1 in aninjecting position, Pig. 4 shows a transverse cross sectional view along plane A-A in Pig. 2 and Pig. 5 shows a transverse cross sectional view along plane B-B in Pig. 2.
    DETAILED DESCRIPTION OP A PREPERED EMBODIMENT OP THEINVENTION Pig. 1 shows schematically a vehicle 1 driven by a combustion engine 2 which may bea diesel engine. The vehicle 1 can be a heavy vehicle. Exhaust gases from the cylindersof the combustion engine 2 are directed to an eXhaust line 3. A turbine 4 of aturbocharger is arranged in the eXhaust passage 3. The turbocharger also comprises acompressor 5 compressing charge air to be directed, via an air passage 6, to thecombustion engine 1. The air passage 6 comprises a charged air cooler 7 cooling thecharge air before it enters the combustion engine 2. The eXhaust passage 3 is providedwith a SCR (Selective Catalytic Reduction) system for reducing emissions of nitrogenoXides in the eXhaust gases. The SCR system includes an injection arrangementinjecting a reducing agent in the form of a urea solution in a specific dose to the eXhaust gases in the eXhaust passage 3.
    The injection arrangement comprises a tank 8 in which the urea solution is stored. Theurea solution is directed, via an inlet line 9, to an injection unit 10 injecting the ureasolution into the eXhaust gases. The injection unit 10 injects urea solution in theeXhaust passage 3 in a position substantially immediately downstream of the turbine 4.A control unit 11 controls the supply of urea solution from the tank 8 to the injectionunit 10 by means of a pump 12. The control unit 11 controls the injection of the ureasolution by means of a solenoid valve 13. The solenoid valve 13 is arranged in a returnline 14. The retum line 14 returns unused urea solution from the injection unit 10 tothe tank 8. The control unit 11 may be a computer unit provided with a suitablesoftware for the control of the pump 8 and the solenoid valve 13. The control unit 11may receive information about a number of operating parameters whereupon itcalculates the amount of urea solution to be supplied to the eXhaust gases at which theemissions of nitrogen oXides in the eXhaust gases are reduced in an optimal manner.Since the injection unit 10 is arranged close to the turbine 4, it is exposed for eXhaust gases of high temperatures and vibrations from the combustion engine 2. The control unit 11, the pump 12, the so1enoid Valve 13 and the tank 8 are arranged at a distance from the injection unit 10 in more protected positions.
    The SCR system comprises a SCR-cata1yst 15. In this case, the SCR cata1yst 15 isarranged in a si1encer 16 in the exhaust passage 3. The si1encer 16 a1so contains aschematica11y indicated particu1ate filter 17. The eXhaust passage 3 may a1so containother eXhaust treatment components such as an oxidation cata1yst and an ammoniacs1ip cata1yst. The injected urea so1ution is heated by the eXhaust gases to a temperatureat which it evaporates. The evaporated urea so1ution is converted to ammonia whichenters the SCR-cata1yst 15. In the SCR-cata1yst 15, the nitrogen in the ammonia reactschemica11y with the nitrogen in the nitrogen oXides such that nitrogen gas is formed.The hydrogen in the ammonia reacts chemica11y with the oXygen in the nitrogen oXidessuch that water is formed. Thus, the nitrogen oXides in the eXhaust gases are reduced in the SCR-cata1yst 15 to nitrogen gas and water vapor.
    Fig. 2 and 3 show a 1ongitudina1 cross sectiona1 view of the injection unit 10. Theinjection unit 10 comprises a housing inc1uding a first housing portion 18 and a secondhousing portion 19. The first housing portion 18 comprises a front wa11 18a comprisingan orifice 20 for injection of urea so1ution in the eXhaust gases in the eXhaust passage3. The second housing portion19 is annu1ar. The second housing portion 19 has anouter periphery surface to be fiXed1y connected to an inner surface of the first housingportion 18. The second housing portion 19 comprises an in1et channe1 9a defining apart of the in1et1ine 9 and a retum channe1 14a defining a part of the return 1ine 14.The injection unit 10 comprises a piston member 21 movab1y arranged in the housing 18, 19 between a first position and a second position.
    The piston member 21 comprises a front portion 21a. Fig. 2 shows the piston member21 in the first position. The front portion 21a has a conica1 design with a protrudingportion to be introduced into the orifice 20 in the first position. Thus, no urea so1utionis injected into the eXhaust gases when the piston member 21 is in the first position.Fig. 3 shows the piston member 21 in the second position. In the second position, theprotruding portion of the front portion 21a has been moved out of the orifice 20 suchthat it is exposed. Thus, urea so1ution can injected into the exhaust gases when thepiston member 21 is in the second position. The piston member 21 comprises a pistonportion 21b dividing an inner space of the housing 18, 19 in a first chamber 23 and a second chamber 24. The piston portion 21b comprises an outer periphery surface slidingly arranged in contact With an inner surface of the first housing portion18. Thepiston member 21 comprises a shaft portion 21c having a smaller diameter than thepiston portion 21b. The shaft portion 21c is slidably arranged in in contact with aninner periphery surface defining a center hole 19a of the annular second housing portion 19.
    The piston portion 21b comprises on one side a first piston area a1 to be in contact withthe urea solution in the first chamber 23 and on an opposite second side a secondpiston area az to be in contact with the urea solution in the second chamber 24. Thepiston portion 21b comprises a first flow channel 25a eXtending between the firstchamber 23 and the second chamber 24. The first flow channel 25a has an opening tothe first chamber 23 located close to the inlet channel 9a in the second housing portion19 delivering urea solution to the first chamber 23. The piston portion 21b comprises asecond flow channel 25b eXtending between the first chamber 23 and the secondchamber 24. The second flow channel 25b has an opening to the first chamber 23located close to the return channel 14a in the second housing portion 19 receiving ureasolution to the first chamber 23. The flow channels 25a, 25b are designed such that theurea solution receives a predeterrnined pressure drop when it flows between the firstchamber 23 and the second chamber 24. Fig. 4 shows a cross sectional view throughthe first chamber 23 and Fig. 5 shows a cross sectional view through the secondchamber 24.
    During operation of the vehicle, the control unit 11 controls the pump 12 such that itpumps a suitable amount of urea solution from the tank 8, via the inlet line 9, to thefirst chamber 23. During operation condition when no urea solution is to be injectedinto the eXhaust gases, the control unit 11 sets the solenoid valve 13 in an openposition. Due to the pressure drop in the first flow channel 25a, the second chamber 24receives urea solution with a second pressure pz which is lower than the first pressurep1 in the first chamber 26. The first area a1 of the piston 21 which is in contact with theurea solution in the first chamber 23 is smaller than the second area az of the piston 21which is in contact with the urea solution in the second chamber 24. The first pressure p1 and the second pressure pz may be in the pressure range of 0-5 bar.
    A first force F1= p1*a1 acts on the piston member 21 in order to move it towards thefirst position. A second force Fz= pz*az acts on the piston member 21 in order to move it in an opposite direction to the second position. The pressure drop in the flow channel 25a is dimensioned such that the ratio between the first pressure p1 in the first chamber26 and the second pressure pz in the second chamber 24 are larger than the ratiobetween the second area az and the first area a1. Consequently, the first force Fi islarger than the second force P2 when the solenoid valve 13 is in an open position.Consequently, the piston member 21 is moved to the first position in which theprotruding portion closes the orifice 20. Consequently, no urea solution is injected intothe eXhaust gases in the eXhaust passage 3. The main part of the urea flow to the firstchamber 23 is immediately returned, via the return line 14, to the tank 8. A small ureaflow is directed from the first chamber 23, via the first flow channel 25a, to the secondchamber 24 and back again to the first chamber 23, via the second flow channel 25b,before it is returned to the tank 8. This small urea flow provides a cooling of theincluding components of the injection unit 10 namely the first housing portion 18, thesecond housing portion 19 and the piston member 21. Furthermore, it prevents accommodation of urea solution of a high temperature in the second chamber 24.
    During operation condition when urea solution is to be injected into the exhaust gases,the control unit 11 sets the solenoid valve 13 in a closed position. Consequently, theurea flow from the first chamber 23, via the retum line 14, to the tank 8 is stopped. Inthis case, the urea solution is forced from the first chamber 23, via the flow channels25a, 25b, to the second chamber 24 and out via the orifice 20. Consequently, thesecond pressure pz of the urea solution in the second chamber 24 will be only slightlylower than the first pressure p1 in the first chamber 25. The above mentioned pressuredrops and the areas a1, az are dimensioned such that the second force Fz will be largerthan the first force Fi. Consequently, the piston member 21 is moved to the secondposition when the solenoid valve 13 is in the closed position. In the second positionurea solution is pressed out from the second chamber 24, via the orifice 20, to theeXhaust gases in the eXhaust passage 3. The orifice 20 is dimensioned such that thepressure drop of the urea solution when it flows out through the orifice 20 is largerthan the pressure drop of the urea solution when it flows through the flow channels25a, 25b between the first chamber 26 and the second chamber 24. The pressure dropin the orifice 20 is necessary in order to maintain the second pressure pz in the secondchamber 24. In other case, the piston member 21 will be moved from the second position during the injection process.
    The injection unit 10 has a very simple and robust design with only three including components namely a first housing portion18, a second housing portion 19 and a piston member 21. All three components of the injection unit 10 are made of materialsWhich are resistant to high temperatures. The components can, for example, bemanufactured of suitable metal materials. The robust design of the injection unit 10makes it also resistant to Vibrations. Consequently, it is possible to arrange theinjection unit 10 substantially immediately doWnstream of the turbine 4 in the eXhaustpassage 3. The temperature of the eXhaust gases are usually always high in thisposition Which facilitate the evaporation process of the urea solution and it increases,for example, the capacity of the SCR-catalyst 15 to reduce nitrogen oXides in theeXhaust gases relatively soon after a cold start. Sensible components such as thecontrol unit 11, the pump 12, and the solenoid Valve 13 can be arranged at a suitabledistance from the injection unit 10 in a more protected position from high temperature and Vibrations.
    The invention is not restricted to the embodiments described on the draWing but may be Varied freely Within the frame of the claims.
    权利要求:
    Claims (16)
    [1] 1. An injection arrangement for injection of a reducing agent into an eXhaust1ine (3) ofa combustion engine (2), wherein the injection arrangement (7) comprises an injectionunit (10) comprising a housing (18, 19), a piston member (21) dividing an inner spaceof the housing (18) in a first chamber (26) and a second chamber (24), and an orifice(20) arranged in the second chamber (24) Via which reducing agent is injected into theeXhaust1ine (3), and wherein the injection arrangement (7) further comprises a pump(12), an in1et 1ine (9) Via which reducing agent is directed by the pump (12) to the firstchamber (23), a return 1ine (14) Via which reducing agent 1eaves the first chamber(23),characterized in that the injection arrangement (7) comprises at 1east one flowchanne1 (25a, 25b) a11owing a reducing agent flow with a specific pressure dropbetween the first chamber (23) and the second chamber (24), and a Valve member (13)arranged in the return 1ine (14) which in an open position creates a first ratio betweenthe pressures in the first chamber (23) and in the second chamber (24) at which thepiston member (21) is moved to a first position in which injection of reducing agentVia the orifice (20) is prevented and which in a c1osed position creates a second ratiobetween the pressures in the first chamber (23) and in the second chamber (24) atwhich the piston member (21) is moved to a second position in which the injection of reducing agent via the orifice (20) is a11owed.
    [2] 2. An injection arrangement according to c1aim 1, characterized in that it comprises at1east two flow channe1s (25a, 25b) a11owing a reducing agent flow with a specific pressure drop between the first chamber (23) and the second chamber (24).
    [3] 3. An injection arrangement according to c1aim 1 or 2, characterized in that said at1east one flow channe1 (25a, 25b) eXtends through the piston (21).
    [4] 4. An injection arrangement according to any one of the preceding c1aims,characterized in that the piston member (21) comprises a first area (a1) in contact withthe reducing agent in the first chamber (26) and a second area (az) in contact with thereducing agent in the second chamber (24), wherein the second area (az) is 1arger thanthe first area (a1).
    [5] 5. An injection arrangement according to any one of the preceding c1aims, characterized in that the orifice (20) is designed such that the reducing agent receives a 12 1arger pressure drop When it floWs out through the orifice (20) than When it floWs fromsaid at 1east one floW channe1 (25a, 25b) between the first chamber (23) and the secondchamber (24).
    [6] 6. An injection arrangement according to any one of the preceding c1aims,characterized in that the housing (1) comprises a first housing portion (18) comprisingthe orifice (20) and a second housing portion (19), and that said housing portions (18, 19) form an inner space for the piston member (21) in a connected state.
    [7] 7. An injection arrangement according to c1aim 6, characterized in that the second housing portion (19) is annu1ar.
    [8] 8. An injection arrangement according to c1aim 6 or 7, characterized in that the secondhousing portion (19) comprises an in1et channe1 (9a) through Which reducing agent isdirected from the in1et 1ine (9) to the first chamber (23) and an retum channe1 (14a)through Which reducing agent is directed from the first channe1 (23) to the return 1ine(14).
    [9] 9. An injection arrangement according to any one of the preceding c1aims,characterized in that the piston member (21) comprises a front portion (21a)configured to c1ose the orifice (20) in the first position and eXpose the orifice (20) in the second position.
    [10] 10. An injection arrangement according to any one of the preceding c1aims,characterized in that the piston member (21) comprises a piston portion (21b)configured to divide the first chamber (23) from the second chamber (24).
    [11] 11. An injection arrangement according to any one of the preceding c1aims,characterized in that the piston member (21) comprises a shaft portion (21c) to be ins1idab1e contact With the housing (19).
    [12] 12. An injection arrangement according to any one of the preceding c1aims, characterized in that the Valve member is a so1enoid Valve (13).
    [13] 13. An injection arrangement according to any one of the preceding c1aims, characterized in that the Valve member (13) is contro11ed by a contro1 unit (11). 13
    [14] 14. An injection arrangement according to any one of the preceding c1aims,characterized in that the injection arrangement comprises a tank (8) from Whichreducing agent is directed to the first chamber (23) Via the in1et1ine (9) and to Which reducing agent is directed back to from the first chamber (23) Via the return 1ine (14) When the Valve member (13) is in an open position.
    [15] 15. An injection arrangement according to any one of the preceding c1aims characterized in that the reducing agent is a urea solution.
    [16] 16. An eXhaust system comprising an injection arrangement according to any one of the preceding c1aims 1- 15.
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    同族专利:
    公开号 | 公开日
    SE540233C2|2018-05-08|
    EP3293377A1|2018-03-14|
    EP3293377B1|2019-12-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE10332114A1|2003-07-09|2005-01-27|Robert Bosch Gmbh|Cooled device for metering reducing agent to the exhaust gas of an internal combustion engine|
    US20070228191A1|2006-03-31|2007-10-04|Caterpillar Inc.|Cooled nozzle assembly for urea/water injection|
    DE102006020439A1|2006-05-03|2007-11-08|Purem Abgassysteme Gmbh & Co. Kg|Method and device for dosing a reducing agent in an exhaust system of an internal combustion engine|
    US9920674B2|2014-01-09|2018-03-20|Cummins Inc.|Variable spray angle injector arrangement|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1651197A|SE540233C2|2016-09-07|2016-09-07|An injection arrangement for injection of a reducing agent into an exhaust line of a combustion engine|SE1651197A| SE540233C2|2016-09-07|2016-09-07|An injection arrangement for injection of a reducing agent into an exhaust line of a combustion engine|
    EP17188312.7A| EP3293377B1|2016-09-07|2017-08-29|Injection arrangement for injection of a reducing agent into an exhaust line of a combustion engine|
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