• 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:
    A method for determining a mass flow rate of ammonia (dm (NH2) _32) between two SCR catalysts (22, 23) installed one behind the other in an exhaust gas pipe (11) forming part of an SCR catalyst system (20) which has only one reducing agent dosing unit (21) upstream of the first SCR catalyst (22). According to the method, the mass flow rate of ammonia is determined from the signal of a nitrogen oxide detector (22) installed between the two SCR catalysts (22, 23) and the signal of an oxide detector. nitrogen (33) installed downstream of the second SCR catalyst (23).
    公开号:FR3047272A1
    申请号:FR1750860
    申请日:2017-02-02
    公开日:2017-08-04
    发明作者:Frank Schweizer
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    Field of the invention
    The present invention relates to a method for determining a mass flow rate of ammonia between two SCR catalysts installed one behind the other in an exhaust gas duct forming part of an SCR catalyst system which does not comprise a reducing agent dosing unit upstream of the first SCR catalyst. The invention also relates to a computer program executing the steps of the method as well as to a machine-readable memory medium containing the program of the computer. The invention also relates to an electronic control device for executing the method.
    State of the art
    Selective catalytic reduction SCR is a promoter process for reducing the nitrogen oxide content of oxygen-rich exhaust gases with ammonia or ammonia decomposing reagents. The efficiency of an SCR catalyst depends on its temperature, the speed of the exhaust gas and, very importantly, the level of filling of the ammonia adsorbed on its surface. As with the reduction of the nitrogen oxides, in addition to the ammonia directly dosed with adsorbed ammonia, the yield of a charged SCR catalyst is higher than that of an empty catalyst. The accumulation behavior depends on the operating temperature of the catalyst. The lower this temperature, the greater its capacity of accumulation.
    When the accumulator of a SCR catalyst is completely filled, it can be reduced by sudden changes in the load of the internal combustion engine whose exhaust gas will be reduced by the SCR catalyst, even with an ammonia slip, if ammonia or no ammonia reagent is no longer used in the exhaust line. In order to achieve as high a nitrogen oxide conversion as possible, however, it is essential to operate the SCR system with a high level of ammonia. However, if, due to a sudden load variation of the internal combustion engine, the temperature of the fully charged SCR catalyst increases, its capacity to accumulate ammonia decreases, which results in an ammonia slip.
    This effect is particularly accentuated by the fact that the SCR catalysts are installed near the internal combustion engine and thus the SCR catalyst quickly reaches its operating temperature after a cold start of the internal combustion engine. A second SCR catalyst installed downstream of the first SCR catalyst can thus be provided in the exhaust gas duct to absorb ammonia slip through the first catalyst and ultimately convert this ammonia.
    The on-board diagnostic (OBD diagnostic) guidelines require monitoring of both SCR catalysts. For this, in general, downstream of the two SCR catalysts, there is a detector of nitrogen oxides. For cost reasons, a metering valve is usually installed upstream of the first SCR catalyst to determine the ammonia decomposing reactant solution in the exhaust gas line. The ammonia filling of the second catalyst SCR is, under these conditions, only by the sliding of ammonia through the first catalyst SCR. Data from such catalysts can be used to model the fill level of the two SCR catalysts. However, in the event of a gap in modeling the aging of the SCR catalysts, the actual fill levels may differ significantly from the modeled fill levels. This results in changes in the efficiency of the reduction of nitrogen oxides and thus possibly the exceeding of the emission limits.
    Description and advantages of the invention
    The method according to the invention is used to determine a mass flow rate of ammonia between two SCR catalysts installed one after the other in the exhaust gas duct and forming part of an SCR catalyst system comprising no a reducing agent dosing unit upstream of the first SCR catalyst. From a signal provided by a NOx nitrogen oxide detector installed between the two SCR catalysts and a NOx nitrogen oxide sensor signal installed upstream of the second SCR catalyst is determined. It is used for this purpose that the detector of nitrogen oxides installed in such a catalyst system SCR and between the two catalysts SCR reacts in transverse sensitivity to ammonia and that is why it measures not only the oxides in the first SCR catalyst, but also the ammonia from the ammonia slip on the first SCR catalyst. A suitable calculation method distributes the signal provided by the NOx nitrogen oxide sensor installed between the two SCR catalysts to ammonia and nitrogen oxides to thereby determine the mass flow rate of nitrogen oxides.
    According to a simple development of the method, the difference between the concentration signals provided by the two sensors is used as the basis for determining the mass flow rate of ammonia. Then, just convert the mass concentrations.
    According to a more complex development of the process, from the NOx nitrogen oxide detector signal installed between the two SCR catalysts and the signal of the second NOx nitrogen oxide detector installed downstream of the second SCR catalyst, we obtain a specific dosing agent application of the SCR catalyst system and a specific dosing agent application of the first SCR catalyst. The mass flow of ammonia can be obtained by comparing the integral of the two dosing agent demands as a function of time. The area between the two integrals is thus proportional to the ammonia slip downstream of the first SCR catalyst. The specific metering means is the quotient of the mass of ammonia assayed in the first SCR catalyst and the mass of nitrogen oxides converted in the first SCR catalyst or in the overall SCR catalyst system. For the calculation of the mass of converted nitrogen oxides, the molar mass of the nitrogen dioxide is always calculated, that is to say 46 g / mol. If the mass of ammonia actually dosed differs from this value because of the regulating actions of the mass of ammonia to be determined according to the model, this supposes that the quantity of nitrogen oxides converted was high.
    For the calculation of the two dosing agent requirements, the mass of ammonia released by the reducing agent and which is dosed by the reducing agent dosing unit in the exhaust gas line is preferably taken into account. and the mass of the nitrogen oxides upstream of the first SCR catalyst. The ammonia mass dosed is determined by the control of the reducing agent dosing unit. The mass of nitrogen oxides upstream of the first SCR catalyst is determined with the NOx nitrogen oxide sensor installed at this location or with a model.
    In the above-described embodiments of the process, the determination is preferably made at an operating point of the SCR catalyst system, at which point a variation of the ammonia filling levels of the two SCR catalysts does not exceed a threshold of variation. This increases the reliability of the mass flow of ammonia obtained if approximately it can be assumed that in both SCR catalysts there was no absorption or desorption of ammonia and that this does not participate in the mass flow of ammonia in the SCR catalyst system.
    According to another feature, in these embodiments of the process, preferably, an operating point of the SCR catalyst system is determined where the slip of ammonia by the second SCR catalyst does not exceed a slip threshold. In a particularly preferred manner, this sliding threshold is equal to zero. In principle, SCR catalyst systems with two SCR catalysts are used so that the ammonia slip downstream of the second SCR catalyst does not exist because this ammonia would escape to the ambient air at the operating points for which one can estimate that the objective is reached; to determine the mass flow rate of ammonia it can be estimated that between the two SCR catalysts, the mass flow of ammonia downstream of the second catalyst SCR is practically equal to zero. If this condition is not fulfilled, it deteriorates the reliability of the mass flow of ammonia obtained.
    According to another exemplary embodiment of the method, the mass flow rate of ammonia is determined in a particularly precise manner to determine the mass flow rate of ammonia of the yield of the second catalyst SCR. This yield can thus be taken as a model.
    The ammonia filling levels of the two SCR catalysts can be corrected by the mass flow rate of ammonia that is determined according to all the embodiments of the process, to minimize the differences between the physical fill levels and the modeled fill levels. ammonia.
    The computer program according to the invention is designed to execute each step of the method, in particular when the program is executed by a computer or an electronic control device. It makes it possible to implement the method with a usual electronic control device without having to make constructive modifications for it. The program is stored on a machine-readable memory. The program is performed by a conventional electronic control device by the process of determining a mass flow rate of ammonia between two SCR catalysts installed one after the other in the exhaust line and forming part of the process. an SCR catalyst system, and which comprise only one reducing agent dosing unit upstream of the first SCR catalyst.
    drawings
    The present invention will be described hereinafter in more detail using examples of methods for determining a mass flow rate of ammonia in an engine exhaust gas line, shown in the accompanying drawings. in which: FIG. 1 is a diagram of an SCR catalyst system comprising two SCR catalysts whose mass flow rate of ammonia between the two SCR catalysts is determined using a method according to one of the embodiments. of the invention, FIG. 2 shows the timing diagram of the specific application of the dosing agent of an SCR catalyst system comprising two SCR catalysts and of the specific dosing means for applying one of the two SCR catalysts, according to FIG. a process corresponding to the embodiment of the invention, FIG. 3 shows the chronogram of the concentration of ammonia between two SCR catalysts according to an embodiment of the process of the invention.
    Description of embodiments
    The exhaust gas duct 11 of an internal combustion engine 10 comprises an SCR catalyst system 20 as shown in FIG. 1. It has a reducing agent dosing unit 21 which injects an aqueous solution of urea in the exhaust gas duct 11. At high exhaust temperatures, this urea solution releases ammonia. Downstream of the reducing agent dosing unit 21 there is a first SCR catalyst 22 and a second SCR catalyst 23. A first NOx nitrogen oxide detector 31 is installed upstream of the dosing unit. of a reducing agent 21 in the exhaust gas duct 11. A second nitrogen oxide detector NOx 32 is installed between the two catalysts SCR 22, 23. A third detector NOx nitrogen oxides is installed in downstream of the second catalyst SCR 23. All NOx nitrogen oxide detectors 31, 32, 33 supply signals to an electronic control device 40. As NOx nitrogen oxide detectors 31, 32, 33 have a sensitivity transverse to ammonia, the signals they provide are sum signals corresponding to the sum of nitrogen oxides and ammonia. The first nitrogen oxide detector NOx is, however, installed upstream of the reducing agent dosing unit 21 so that it reliably measures the amount of nitrogen oxides contained in the exhaust gases. . If the SCR catalyst system 20 is operated so as not to have ammonia slip on the second SCR catalyst 23, it can be assumed that the signal of the third NOx oxide detector measures exclusively the nitrogen oxides. Since an ammonia slip is provided on the first SCR catalyst 22, to supply the second SCR catalyst 23 with ammonia, the second nitrogen oxide detector NOx always provides a sum signal for the ammonia and the oxides of ammonia. nitrogen. The reducing agent dosing unit 21 reports the amount of ammonia dosed in the exhaust line 11 also to the control unit 40.
    A first example of the process according to the invention is based on the knowledge of the difference between the concentration (NH 3) 2 of the ammonia which has been released from the reducing agent solution obtained by the dosing unit. reducing agent 21 and the concentration of ammonia r (NH 3) 32 on the second nitrogen oxide detector NO x 32 according to formula 1 of the difference between the concentration of nitrogen oxides r (NOx) 31 upstream of the first SCR catalyst 22 and the concentration of nitrogen oxides r (NOx) 32 between the two catalysts SCR 22 and 23: ## STR2 ## (Formula 1)
    The value of the concentration r (direction) _32 transmitted by the second nitrogen oxide detector NOx 32 to the control unit 40 thus corresponds, according to formula 2, to the sum of the concentrations of nitrogen oxides and ammonia. between the two catalysts SCR 22, 23: r (direction) 32 = r (NOx) 32 + r (NH3) 32 (Formula 2)
    According to formula 3, the concentration of nitrogen oxides r (NH 3) 21 is the difference between the concentration of nitrogen oxides upstream of the first catalyst 22 and the concentration of nitrogen oxides (NOx) 33 in. downstream of the second catalyst SCR 23: ## STR1 ## (Formula 3) From formulas 1 to 3, formula 4 is obtained which makes it possible to calculate the concentration of ammonia r ( NH3) between the two SCR catalysts 22, 23 from the detector signal supplied by the second NOx detector 32 and the third NOx detector 33:
    (Formula 4) If there is no slippage of ammonia on the second catalyst SCR 23, the concentration of nitrogen oxides r (NOx) _33 downstream of the second catalyst SCR 23 can be taken from the signal of the third NOx detector 33. By determining the two values of con
    concentration with time, one can calculate the mass flow of ammonia.
    According to a second exemplary embodiment of the process of the invention, by applying formula 5, the specific demand of the facDos_22 dosing agent of the first SCR catalyst 22 is calculated. In this formula m (NH3) _21 denotes the mass of ammonia introduced by metering and the difference between the mass of nitrogen oxides m (NOx) _31 upstream of the first catalyst SCR 22 and the mass of nitrogen oxides m (NOx) _32 downstream of the first catalyst SCR corresponds to the mass of nitrogen oxides converted in the first SCR catalyst:
    (Form 5)
    The mass of nitrogen oxides m (N0x) 32 and the ammonia mass m (NH3) 32 can not be measured directly. Since the m (direction) mass signal supplied by the second nitrogen oxide detector 32 corresponds to the sum of the mass of nitrogen oxides m (NOx) -32 and the mass of ammonia m (NH3) 32 between the two SCR catalysts 22, 23, formula 5 can be replaced by the following formula 6:
    (Form 6)
    To calculate the specific demand of the facDos_20 dosing agent of the SCR catalyst system 20, according to formula 7, the mass of nitrogen oxides measured by the third nitrogen oxide detector 33 downstream of the second SCR catalyst 22:
    (Form 7)
    It is assumed that downstream of the second SCR catalyst 23 there is no slip of ammonia so that the signal provided by the third nitrogen oxide detector NOx 33 is not distorted by the presence of ammonia. Moreover, leaving the reduction of oxides of nitrogen
    in the first SCR catalyst 22, the following formula 8 can be established for the entire SCR 20 catalyst system:
    (Form 8)
    With formulas 6 to 8 and with sensor data, we obtain the dosing agent requests facDos_20, facDos_22. For this, it must be taken into account that the molar masses of ammonia and nitrogen oxides are different. For the mass of nitrogen oxides, the molar mass of nitrogen dioxide is always used for calculation. FIG. 2 shows its evolution in an exemplary state of operation of the internal combustion engine 10 as a function of time t. The difference between the time integral of the two facDos_20 dosing agent applications, facDos_22 is proportional to the mass flow rate of ammonia between the two SCR catalysts 22, 23. There is a high mass flow of ammonia and thus an high ammonia slip on the first SCR catalyst 22 where the two chronograms of the two specific applications of facDos_20, facDos_22 dosing agent differ significantly. Where these curves approach, the mass flow of ammonia is low. This has been verified in that an ammonia detector (not shown) has been installed between the two catalysts SCR 22, 23 in the exhaust gas duct 11. The chronological evolution of the concentration of ammonia r (NHs) 32 is shown in FIG. 3. Calculation of ammonia mass m (NH3) 32 is obtained from the values measured according to formula 9 below:
    (Form 9)
    In a third embodiment of the process of the invention, it is used that, according to formula 10, the mass flow rate
    of nitrogen oxides dm (NOx) _33 downstream of the second catalyst SCR 23 corresponds to the difference between the mass flow rate of nitrogen oxides dm (NOx) _32 between the two catalysts SCR 22, 23 and the mass flow rate of the slipping ammonia dm (NH3) _32 from the first catalyst SCR 22, the difference to which the difference Am (NHs) is added between the mass of ammonia supplied to the second catalyst SCR 23 and that which it consumes: dm (NOx) _33 = dm (NOx) 32 - dm (NH3) 32 + Am (NH3) (Formula 10)
    In this case it is also necessary to take into account the difference in the molar masses of ammonia and nitrogen oxides. The difference Am (NH3) corresponds, according to formula 11, to the mass flow rate of nitrogen oxides dm (NOx) 32 between the two catalysts SCR 22, 23 and the mass flow rate of nitrogen oxides dm (NOx). Multiplied by the ETA yield (23) of the second SCR catalyst, between the two SCR catalysts 22, 23:
    Am (NH 3) = dm (NOx) 32 - ETA (23) x dm (NOx) 32 (Formula 11) From formulas 10 and 11 the following formula is obtained: dm (NOx) 3333 = (1 - ETA (23) )) x dm (NOx) _32 (Form 12)
    Analogously to formula 2, formula 13 corresponds to the mass flow rate dm (direction) measured from the second nitrogen oxide detector NOx to the sum of the mass flow rate of nitrogen oxides dm (NOx). and the mass flow rate of ammonia dm (NHs) 32 between the two catalysts SCR: dm (direction) 32 = dm (NOx) 32 + dm (NH3) 32 (Formula 13) From formulas 11 and 12, and with Formula 14 can be calculated the mass flow rate of ammonia dm (NHs) _32:
    (Form 14)
    For this purpose, the ETA yield (23) of a model of the second SCR catalyst 23 is used. The mass flow rate of nitrogen oxides dm (NOx) _33 downstream of the second catalyst SCR 23 can be obtained from the signal of the third nitrogen oxide detector NOx 33 if there is no ammonia slip at the second catalyst SCR 23.
    NOMENCLATURE OF THE MAIN ELEMENTS 10 Internal combustion engine 11 Exhaust gas line 20 Catalyst system 21 Reducing agent dosing unit
    22, 23, 24 Catalysts SCR 31, 32, 33 NOx nitrogen oxide detectors 40 Electronic control unit
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    CLAIMS 1 °) Method for determining the mass flow rate of ammonia (dm (NH2) _32) between two SCR catalysts (22, 23) installed one behind the other in an exhaust pipe (11) forming part an SCR catalyst system (20) which comprises only one reducing agent dosage unit (21) upstream of the first SCR catalyst (22), characterized in that the mass flow rate of ammonia is determined from the signal of a nitrogen oxide detector (22) installed between the two SCR catalysts (22, 23) and the signal of a nitrogen oxide detector (33) installed downstream of the second catalyst SCR (23).
    [0002]
    Method according to Claim 1, characterized in that for the determination the difference of the NOx nitrogen oxide sensor signal (32) between two SCR catalysts and the signal of the oxide detector is carried out. NOx nitrogen (33) installed downstream of the second SCR catalyst (23).
    [0003]
    Process according to Claim 1, characterized in that from the NOx nitrogen oxide sensor signal (32) installed between the two SCR catalysts (22, 23) and the signal of the oxide detector. NOx nitrogen (33) installed downstream of the second SCR catalyst, the specific need of the dosing agent (facDos_20) of the SCR catalyst system (20) and the specific need of the dosing agent (facDos_22) of the first catalyst are calculated SCR and the mass flow rate of ammonia (dm (NH3) _32) was determined by comparing the time integral of the two dosing agent requirements (facDos_20, facDos_22).
    [0004]
    4) Method according to claim 3, characterized in that for calculating the two dosing agent requirements (facDos_20, fac-Dos_22) account is taken of the mass of ammonia (m (NH3) _21) which has been released from the reducing agent and dosed by the reducing agent dosing unit (21) in the exhaust gas line and the mass (m (NOx) _31) of the upstream nitrogen oxides of the first SCR catalyst (22).
    [0005]
    Method according to one of Claims 1 to 4, characterized in that the operating point of the SCR catalyst system (20) is determined in which the variation of the ammonia filling levels of the two SCR catalysts is determined. (22, 23) does not exceed a threshold of variation.
    [0006]
    Process according to one of Claims 1 to 5, characterized in that the operating point of the SCR catalyst system (20) in which the slipping of ammonia over the second SCR catalyst (23) does not exceed not a slip threshold.
    [0007]
    7 °) A method according to claim 1, characterized in that to determine the mass flow rate of ammonia (dm (NH2) _32) takes into account the yield (ETA (23)) of the second catalyst SCR (23).
    [0008]
    Process according to one of Claims 1 to 7, characterized in that the ammonia filling levels, modeled of the two SCR catalysts (22, 23), are corrected using the mass flow rate of ammonia. (dm (NH2) 32) obtained.
    [0009]
    9) Computer program adapted to perform the steps of the method according to one of claims 1 to 8 and machine readable memory medium containing the computer program.
    [0010]
    An electronic control device (40) designed to determine by the method according to one of claims 1 to 8, a mass flow rate of ammonia (dm (NH 2) 32) between two SCR catalysts (22, 23). ) installed one behind the other in the exhaust gas duct (11) in an SCR catalyst system (20) and which has only one reducing agent dosage unit (21) upstream of the first SCR catalyst (22).
    类似技术:
    公开号 | 公开日 | 专利标题
    FR3047272A1|2017-08-04|METHOD FOR DETERMINING A MASSIVE FLOW OF AMMONIA
    US8893475B2|2014-11-25|Control system for doser compensation in an SCR system
    FR2875843A1|2006-03-31|METHOD FOR MANAGING AN INTERNAL COMBUSTION ENGINE AND DEVICE FOR IMPLEMENTING SAID METHOD
    US8607548B2|2013-12-17|SCR ammonia slip detection
    US8635007B2|2014-01-21|Filtering method and filter for a NOX sensor of an exhaust gas system
    US20090288394A1|2009-11-26|Integrated engine and exhaust after treatment system and method of operating same
    CN106958478B|2020-04-03|Systems, methods, and apparatus for aftertreatment system monitoring
    BRPI1000809A2|2011-03-22|method for dosing an ammonia releasing reducing agent into an exhaust gas stream
    FR2902139A1|2007-12-14|Selective catalytic reduction catalytic device operating method for e.g. diesel engine, involves using accumulation capacity of catalytic reduction stage in flow direction as dimensioning value for quantity of reducing agent and progenitor
    US20150190749A1|2015-07-09|Method and Apparatus for Estimating the Amount of Reductant Slip in a Selective Catalytic Reduction Device
    FR3045104A1|2017-06-16|METHOD FOR CORRECTING A MODELIZED VALUE OF A CONCENTRATION OF NOX NITROGEN OXIDES
    FR3007795A1|2015-01-02|SYSTEM AND METHOD FOR DIAGNOSING SELECTIVE CATALYTIC REDUCTION OF A MOTOR VEHICLE.
    US20150143884A1|2015-05-28|Method and Apparatus for Estimating a Dosing-Error in a Selective Catalytic Reduction System
    FR2983523A1|2013-06-07|METHOD FOR MANAGING AN EXHAUST GAS TREATMENT PLANT OF AN INTERNAL COMBUSTION ENGINE
    US20090271059A1|2009-10-29|Measurement of no and no2 for control of selective catalytic reduction
    JP2017526849A|2017-09-14|Method and control assembly for operating an exhaust gas system
    FR3071010A1|2019-03-15|METHOD FOR MANAGING A SCR CATALYST SYSTEM COMPRISING A FIRST AND A SECOND SCR CATALYST
    KR20180089300A|2018-08-08|Method for detecting an error in an scr system by means of an ammonia slip
    FR3035442A1|2016-10-28|METHOD OF MONITORING AN SCR CATALYST
    US20150275737A1|2015-10-01|Method for monitoring the formation of nitrogen dioxide at an oxidation catalytic converter, and exhaust system
    FR2947302A1|2010-12-31|METHOD FOR ADAPTING A SCR CATALYST SYSTEM OF A COMBUSTION ENGINE
    KR20180089301A|2018-08-08|Method for detecting an error in an scr system by means of an ammonia slip
    US20130160521A1|2013-06-27|System and method of generating selective catalyst reduction dosing estimate for a diesel engine
    FR2850132A1|2004-07-23|Injecting metered amount of reactant into exhaust system of automobile engine comprises determining the amount from the nitrogen oxide concentration in the exhaust gas
    RU2708173C2|2019-12-04|Method and electronic system for regeneration planning of depleted nitrogen oxides trap
    同族专利:
    公开号 | 公开日
    CN107035489A|2017-08-11|
    CN107035489B|2021-03-23|
    US20170218828A1|2017-08-03|
    DE102016201602A1|2017-08-03|
    US10364729B2|2019-07-30|
    FR3047272B1|2020-09-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102006034805A1|2006-07-27|2008-01-31|Robert Bosch Gmbh|Diesel particulate filter regenerating and nitrogen oxide storage catalyst desulphurizing method for internal combustion engine, involves triggering combined complete or partial regeneration of filter and desulphurization of catalyst|
    WO2009036780A1|2007-09-18|2009-03-26|Fev Motorentechnik Gmbh|Nh3-monitoring of an scr catalytic converter|
    JP4666018B2|2008-07-29|2011-04-06|株式会社デンソー|Exhaust gas purification device for internal combustion engine|
    JP5469553B2|2009-07-17|2014-04-16|日本碍子株式会社|Ammonia concentration detection sensor|
    US8240194B2|2009-07-30|2012-08-14|Ford Global Technologies, Llc|Methods and systems for diagnostics of an emission system with more than one SCR region|
    US9234447B2|2010-12-10|2016-01-12|GM Global Technology Operations LLC|System and method for determining selective catalytic reduction dosing system performance using an ammonia sensor|
    US8387448B2|2011-01-19|2013-03-05|GM Global Technology Operations LLC|Method for monitoring exhaust gas aftertreatment devices|
    DE102011077246B3|2011-06-09|2012-06-06|Ford Global Technologies, Llc|Filtering method for nitrous oxide sensor of exhaust system, involves setting data of nitrous oxide sensor as ammonia measured values when ratio of nitrous oxide modeling error to ammonia modeling error is greater than upper threshold|
    JP5269174B2|2011-11-28|2013-08-21|株式会社豊田自動織機|Exhaust gas purification device in internal combustion engine|
    EP2795076B1|2011-12-23|2016-11-16|Volvo Lastvagnar AB|Exhaust aftertreatment system and method for operating the system|
    US8607625B2|2012-05-10|2013-12-17|GM Global Technology Operations LLC|Service test for exhaust gas treatment system|
    US9188071B2|2012-05-15|2015-11-17|GM Global Technology Operations LLC|System and method for controlling an engine based on ammonia storage in multiple selective catalytic reduction catalysts|
    GB2503246B|2012-06-20|2015-06-17|Perkins Engines Co Ltd|Method and apparatus for estimating a dosing-error in a selective catalytic reduction system|
    CN104781516B|2012-11-16|2017-07-14|丰田自动车株式会社|The emission-control equipment of internal combustion engine|
    US9084966B2|2012-11-29|2015-07-21|GM Global Technology Operations LLC|Diesel oxidation catalyst aging level determination using NOX sensor NO2 interference|
    WO2014087536A1|2012-12-07|2014-06-12|トヨタ自動車株式会社|Device for detecting fault in exhaust gas purifier|
    CN104870763B|2012-12-18|2017-04-05|丰田自动车株式会社|The emission control system of internal combustion engine|
    DE102013203579A1|2013-03-01|2014-09-18|Robert Bosch Gmbh|Method for monitoring an exhaust aftertreatment system|
    FR3007795B1|2013-06-28|2015-06-19|Renault Sa|SYSTEM AND METHOD FOR DIAGNOSING SELECTIVE CATALYTIC REDUCTION OF A MOTOR VEHICLE.|
    CN103644020B|2013-12-24|2017-02-15|北京科领动力科技有限公司|Urea water solution spraying rate control device, system and method of diesel SCR system|
    CN104314650A|2014-07-29|2015-01-28|潍柴动力股份有限公司|SCR feed-forward control method and device|
    US9863922B2|2014-10-29|2018-01-09|GM Global Technology Operations LLC|NOx sensor calibration and application in lean NOx trap aftertreat systems|
    US10048097B2|2014-12-02|2018-08-14|Ngk Insulators, Ltd.|Gas sensor|
    US10094262B2|2015-06-02|2018-10-09|Ngk Spark Plug Co., Ltd.|Concentration determination device and method|
    US10094261B2|2015-06-02|2018-10-09|Ngk Spark Plug Co., Ltd.|Ammonia occlusion amount estimation device and method, and purification control apparatus and method|
    US9803532B2|2015-07-28|2017-10-31|GM Global Technology Operations LLC|Predictive control of ammonia storage in a selective catalytic reduction device using connectivity information|
    JP6288051B2|2015-11-25|2018-03-07|トヨタ自動車株式会社|Ammonia adsorption amount estimation device, ammonia adsorption amount estimation method, and exhaust purification system for internal combustion engine|
    US10488380B2|2016-10-24|2019-11-26|Ngk Insulators, Ltd.|Apparatus for measuring ammonia concentration, system for measuring ammonia concentration, system for treating exhaust gas, and method for measuring ammonia concentration|
    US10018092B2|2016-11-23|2018-07-10|GM Global Technology Operations LLC|Model predictive control for multi-can selective catalytic reduction system|
    US10113464B2|2016-12-08|2018-10-30|GM Global Technology Operations LLC|Method and apparatus for controlling reductant injection into an exhaust gas feedstream from an internal combustion engine|WO2019025870A1|2017-08-02|2019-02-07|Robert Bosch Gmbh|Def injection strategy for multiple injection systems|
    DE102017216082A1|2017-09-12|2019-03-14|Robert Bosch Gmbh|A method of operating an SCR catalyst system comprising a first SCR catalyst and a second SCR catalyst|
    DE102017217728B4|2017-10-05|2021-10-14|Vitesco Technologies GmbH|Method for operating an exhaust gas aftertreatment system of a diesel engine and an exhaust gas aftertreatment system|
    DE102017222582A1|2017-12-13|2019-06-13|Robert Bosch Gmbh|Method for correcting a modeled ammonia mass flow and a modeled nitrogen oxide mass flow and for controlling an SCR catalyst system|
    CN108386262B|2018-03-05|2020-11-06|北京航空航天大学|Method for observing ammonia coverage rate and storage amount of diesel engine series SCR system|
    US10526947B2|2018-04-12|2020-01-07|Ai Alpine Us Bidco Inc|Exhaust aftertreatment system|
    DE102019205107A1|2019-04-10|2020-10-15|Robert Bosch Gmbh|Method for determining an ammonia mass flow|
    法律状态:
    2018-02-23| PLFP| Fee payment|Year of fee payment: 2 |
    2019-01-25| PLSC| Publication of the preliminary search report|Effective date: 20190125 |
    2020-02-20| PLFP| Fee payment|Year of fee payment: 4 |
    2021-02-17| PLFP| Fee payment|Year of fee payment: 5 |
    2022-02-21| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102016201602.4A|DE102016201602A1|2016-02-03|2016-02-03|Method for determining an ammonia mass flow|
    [返回顶部]