• 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 of correcting a modeled value of a mass NOx (mNOxUS, mod) upstream of an SCR catalyst (12) in the exhaust gas line (10) of a motor vehicle which comprises a NOx sensor ( 172) downstream of the SCR catalyst (12) and a fill level observer (161). According to the method, both the specific demand of dosing agent (DBS) of the fill level observer (161) and also the information provided by a quality sensor (162) which monitors the quality of the filling level monitor are monitored. metering agent (141) for correcting the NOx mass (mNOxUS, mod) upstream of the SCR catalyst (12).
    公开号:FR3045104A1
    申请号:FR1662050
    申请日:2016-12-07
    公开日:2017-06-16
    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 correcting the modeled value of a mass of NOx nitrogen oxides upstream of an SCR catalyst in the exhaust gas duct of a motor vehicle. The invention also relates to a computer program executing the steps of the method when it is applied by a computer as well as a machine-readable memory medium comprising the recording of the computer program as well as electronic control apparatus to apply the method of the invention.
    State of the art
    The SCR (Selective Catalytic Reduction Process) process for reducing nitrogen oxides (NOx) contained in oxygen-rich exhaust gases is based on selective catalytic reduction using an aqueous solution of urea (HWL) commercially available under the name AdBlue ®. This solution consists of a third of urea as reagent giving ammonia and two thirds of water. A nozzle sprays the liquid directly upstream of the SCR catalyst in the exhaust gas vein. This results in urea which gives the ammonia (NH3) necessary for the reaction. In the SCR catalyst, the nitrogen oxides of the exhaust gases and the ammonia combine to give water and nitrogen. The efficiency of the SCR catalyst depends on the temperature, the space velocity and, in a particularly decisive manner, the ammonia load. SCR catalysts adsorb to their surface a certain mass of ammonia. Thus, for the reduction of nitrogen oxides, in addition to the aqueous solution of urea, and this direct dosage is accumulated ammonia which increases the efficiency of the catalyst relative to that of an empty catalyst.
    In current SCR systems, a device called an NH3 fill level observer is used to adjust the SCR system's reducing agent filling level if no NOx nitrogen oxide sensor is present upstream of the system. SCR catalyst. DE 10 2012 221 574 A1 describes, in detail, a fill level observer.
    Description and advantages of the invention
    The subject of the present invention is a method for correcting a modeled value of a NOx mass upstream of an SCR catalyst in the exhaust gas duct of a motor vehicle which comprises a NOx sensor downstream of the SCR catalyst. and a fill level observer, which method is characterized by monitoring both the specific demand of the dosing agent by the fill level observer and also information provided by a quality sensor that monitors the fill level. quality of the dosing agent to correct the NOx mass upstream of the SCR catalyst.
    This method is very advantageous because it removes the NOx sensor upstream of the SCR catalyst.
    Preferably, with the aid of the quality sensor, the concentration of the material contained in the dosing agent, for example urea, is determined. The signal provided by the quality sensor is applied to an operating program in the vehicle electronic control unit which converts this output signal provided by the quality sensor into a concentration of urea of the dosing agent. With the concentration of urea, it will be advantageous to determine, in another step of the process, the mass of urea currently dosed in the exhaust gas line.
    Advantageously, in order to determine the correction coefficient of the NOx mass upstream of the SCR catalyst, the NH 3 ammonia and NOx nitrogen oxide masses are used. An advantage of this process is that using the NH 3 ammonia mass ratio and the NOx nitrogen oxide ratio, the known specific application of the dosing agent is determined using the following relationship:
    (1)
    In this formula uinh 3 DosAct represents the currently measured mass of ammonia NH3, mNOxus, mod represents the uncorrected model mass of nitrogen oxides NOx upstream of the catalyst SCR and m.NOxDs, mod represents the modeled mass of oxides NOx nitrogen downstream of the SCR catalyst.
    According to one development, the masses of ammonia NH3 and of NOx nitrogen oxides are filtered to determine the correction coefficient. For this purpose, the respective masses of ammonia NH 3 and nitrogen oxides NO x are integrated in an integrator of their own. As soon as one of the integrators reaches a predefined threshold, all the integrators are multiplied at the same time with a coefficient. This coefficient is between 0 and 1; it is preferably equal to 0.9. Depending on the threshold, this results in a more or less important filtering of the values in the integrators, that is to say the masses of ammonia NH3 and NOx nitrogen oxides and so we will have the desired filtering.
    In particular, the filtering of NH 3 ammonia and NOx nitrogen oxide masses is optimized to learn the correction coefficient after starting the engine and releasing the regulation during a first predetermined duration and, in the phases without release of the regulation, which are less than a second predefined duration, one continues to apply them. This procedure makes it possible to dispose more quickly of the correction coefficient to correct the mass of NOx nitrogen oxides upstream of the SCR catalyst, which is advantageous.
    The process according to the invention is carried out in several stages. First of all we check the quality of the dosing agent using the quality sensor. The quality of the assay agent is the concentration of a material contained in the assay agent. Then, the specific demand of the dosage agent is determined. Then, the correction coefficient C is determined for correcting the mass of NOx nitrogen oxides upstream of the SCR catalyst. An advantage of this process is that with the aid of the known quality of the dosing agent, and from the NH 3 ammonia mass currently dosed in the exhaust gas line, as indicated above. above and with the specific demand of the dosing agent (see formula 1) the correction coefficient is determined in a simple manner as follows:
    (2)
    In this formula, mNH3Cnv is the modeled mass of transformed NOx nitrogen oxides; mNoxDs, sen is the mass of nitrogen oxides NOx measured downstream of the SCR catalyst.
    A formula variant for calculating the correction coefficient C with respect to formula (2) given above is as follows:
    (3)
    In this formula mNOxus, mod, corr, is the modeled mass of nitrogen oxides NOx, already corrected, upstream of the catalyst SCR and k is a predefined constant which corresponds to an amplification coefficient. In this case, the correction coefficient C is thus determined by dividing the mass of nitrogen oxides NOx, modeled, uncorrected, upstream of the catalyst SCR by the mass of nitrogen oxides NOx, modeled, corrected in the next step, before the SCR catalyst. In a first step, the correction coefficient C equal to unity is obtained because in the first step, the mass of oxides of nitrogen NOx modeled, corrected, upstream of the catalyst SCR, is taken as the mass of oxides of nitrogen. NOx nitrogen modeled uncorrected upstream of the catalyst SCR, that is to say the value that a model gives for the mass of NOx nitrogen oxides upstream of the catalyst SCR. An advantage of this method is to be able to calculate in a simple way the correction coefficient C.
    In particular, before determining the specific demand of the dosing agent, the value of the NOx nitrogen oxide mass is modeled both upstream and downstream of the SCR catalyst. From the difference of the modeled masses of nitrogen oxides NOx downstream and upstream of the SCR catalyst advantageously is obtained the transformed mass of NOx nitrogen oxides, that is to say mNH3Cnv, of the model.
    According to a development, before determining the correction coefficient for correcting the mass of NOx nitrogen oxides upstream of the SCR catalyst, the mass of the NOx nitrogen oxides downstream of the SCR catalyst is measured using a NOx nitrogen oxide sensor (NOx sensor). This procedure is very advantageous because the measured mass of nitrogen oxides mNoxDs, sen downstream of the SCR catalyst is used to calculate the correction coefficient.
    According to a development of the invention, before determining the specific demand of the dosing agent, the currently dosed mass of NH3 nitrogen oxides is determined. This mass is determined using the mass of the dosing agent which has been assayed in the assay system and the quality of the assay agent which has been determined beforehand. The currently dosed mass of ammonia NH3 (uinh3 DosAct) is advantageously used to calculate the specific demand of the dosing agent and thus to calculate the correction coefficient.
    Preferably, the correction coefficient obtained is applied to the modeled value of the mass of nitrogen oxides NOx upstream of the catalyst SCR. Thus, the modeled value of the NOx mass and the corresponding prior urea control mass for the SCR catalyst are advantageously corrected.
    According to a development of the invention, after a driving cycle of the vehicle, the correction coefficient is recorded in a memory, which makes it possible to use the correction coefficient at the beginning of the next operating cycle to correct the mass of oxides. NOx upstream of the SCR catalyst because it will be possible to determine in a useful manner the specific demand of dosing agent necessary to determine the correction coefficient only from a certain time after the cold start of the vehicle.
    According to another development of the invention, the deviation of the application of the dosing agent is divided into a portion assigned to a NOx oxide defect upstream of the SCR catalyst and to a mass of the dosing mass. This method makes it possible to observe advantageously for which percentage the model is responsible for an inaccuracy of the mass of NOx oxides and to what percentage this inaccuracy of the dosing module plays a role. To determine the dosing error, the partial tolerances of the dosing system supplied by its manufacturer are used. The invention further relates to a computer program for executing the steps of the method of the invention, in particular when this program is applied by a computing device or an electronic control device, which makes it possible to implement the method of the invention. invention with an electronic control apparatus without having to make constructive modifications. The invention further relates to a machine readable memory medium which contains the program record as well as to an electronic control apparatus for applying the program.
    drawings
    The present invention will be described hereinafter in more detail with the aid of exemplary embodiments shown in the accompanying drawings, in which: FIG. 1 is a diagram of an SCR catalyst system and FIG. the flow chart of an exemplary embodiment of the method of the invention.
    Description of embodiments
    Figure 1 shows the exhaust gas duct 10 of an internal combustion engine 11 of a conventional vehicle. The exhaust gas duct 10 comprises an SCR catalyst 12. The SCR catalyst 12 is fed by a dosing module 13 with a dosing agent solution 141 of a tank 14.
    In the embodiment described, the assay means is an aqueous solution of urea (HWL). The metering module 13 comprises a transfer pump 131 which takes the dosing agent solution 141 from the reservoir 14 via a suction line 15. The dosing agent solution 141 is transmitted to an electromagnetic metering valve 133 via A pressure line 132. The metering valve 133 injects the metering agent solution 141 into the exhaust line 10 between the internal combustion engine 11 and the SCR catalyst 12. The transfer pump 131 and the valve The metering unit 133 is controlled by an electronic control device 16 which includes a fill level observer 161. A nitrogen oxide sensor NOx 172 installed downstream of the catalyst SCR 12 in the exhaust gas duct 10 provides the measurement data relating to the mass of nitrogen oxides NOx in the exhaust gas duct 10 to the control unit 16 which processes these data inter alia in the level observer of re 161. The bottom of the tank 14 comprises a quality sensor 142 which monitors the quality of the dosing agent solution 141. In this exemplary embodiment, the quality sensor 142 is in the form of an ultrasonic sensor. The data output by the quality sensor 142 is transmitted to an operating program 162 of the electronic control apparatus 16. This determines the urea concentration of the dosing agent solution 141 from the data provided by the ultrasonic sensor 142. In this exemplary embodiment, the quality of the dosing agent solution 141 is the concentration of urea.
    Figure 2 shows the flow chart of an exemplary embodiment of the method of the invention. After starting the process in step 20, the mass of nitrogen oxides NOx upstream mNOxus, mod and the downstream mNOxDs, mod of catalyst SCR 12, are first modeled in step 21. the following step 22 is checked the quality of the dosing agent solution 141. For this, with the ultrasonic sensor 142 the travel time of the ultrasound signal is measured in the dosing agent solution 141 from of which the urea concentration of the dosing agent solution 141 is then determined in the operating unit 162.
    In the following step 23, the mass of ammonia NH3 currently measured m.NH3DosAct is determined from the metered mass of the assay agent solution and from the determined quality of the assay agent solution 141. The specific demand dosing agent DBS is then determined in step 24 using formula (1). In order to determine the specific demand of the DBS dosing agent, the mass of ammonia NH 3 and the mass of nitrogen oxides NO x filtered beforehand are used. For this, we integrate each mass into an integrator and as soon as one of the integrators reaches a predefined threshold, we multiply all the integrators at the same time with a coefficient. In the embodiment described, this coefficient is equal to 0.9. Thus, from the model masses of NOx nitrogen oxides and the obtained quality of the dosing agent solution 141, the specific demand of the DBS dosing agent is determined.
    In step 25 of the method, using the nitrogen oxide sensor NOx 172, the mass of nitrogen oxides NOx mNOxDs, ie exhaust gas downstream of the catalyst SCR 12 is measured.
    In the following step 26, using the specific demand of dosing agent DBs and the mass of nitrogen oxides NOx, measured downstream of the catalyst SCR 12, the correction coefficient C is calculated to correct the model mass of nitrogen oxides NOx upstream of the catalyst SCR 12 according to formula (2).
    In step 27, the correction coefficient C is applied to the modeled value of the mass of nitrogen oxides NOx upstream of the catalyst SCR 12 so as to have a better prior control of the ammonia mass NH3 to be assayed in step 28 based on the corrected mass of nitrogen oxides NOx mNOxus, mod, corr upstream of the catalyst SCR 12.
    According to one embodiment, the correction coefficient C is recorded in a memory after a vehicle operating cycle in order to have the correction coefficient C at the beginning of the next driving cycle to perform the correction.
    According to another development, the determined difference in the demand of the DBS dosing agent is divided into a portion relating to the NOx nitrogen oxide error upstream of the SCR catalyst and to a dosing error. In order to determine the dosing error (metered quantity error), the partial tolerances of the dosing system supplied by its manufacturer are used.
    According to another development, the filtering of ammonia mass NH3 and mass of nitrogen oxides NOx is optimized to learn the correction coefficient C after starting the engine and releasing the regulation during a period of time. first predefined duration and to continue to apply it in the phases without release of the regulation, and whose duration is less than a second predefined duration.
    FIG. 3 shows, by way of example, the curve of different mass signals of NOx nitrogen oxides in grams per unit of time (seconds). The expression mNOxus, true corresponds to the plot of the "true" mass signal of the nitrogen oxides NOx upstream of the catalyst SCR 12, ie a measured mass signal, of nitrogen oxides NOx which, with the plot with the reference NOx mNOxus, mod, corr corresponds to a modeled value, corrected, mNOxus, mod of the mass signal of the nitrogen oxides NOx upstream of the catalyst SCR 12 and the plot bearing the reference m.NOxus, mod corresponds to a modeled, uncorrected value, m.NOxus, mod of the mass signal of the nitrogen oxides NOx upstream of the catalyst SCR 12. By this representation, it is explained at the same time the application of the method to correct the modeled value mNOxus, mod of the mass of the nitrogen oxides NOx upstream of the catalyst SCR 12. The "true value" of the mass signal of nitrogen oxides NOx (m.NOxus curve, true) was reduced by at least 30% in a simulation (plot m.NOxUS, mo d) to falsely represent a modeled value too much f aible mNOxus, mass signal mod of nitrogen oxides NOx upstream of catalyst SCR 12. This modeled value mNOxus.mod, too low (mNOxus curve, mod) has been corrected with the correction coefficient C based on the specific demand of DBS dosing agent. The result is the curve bearing the reference mNOxus, mod, corr which represents the evolution of the corrected modeled value mNOxus, mod, correl of the mass signal of the nitrogen oxides NOx upstream of the catalyst SCR 12. Figure 3 clearly shows that the evolution of the corrected model value is m.NOxus, mod, the correlation of the measurement signal NOx is closer to the trace of the "true" value of the mass signal mNOxus, true than the plot of the uncorrected modeled value mNOx mNOxus, mass signal mod of NOx nitrogen oxides.
    NOMENCLATURE OF MAIN ELEMENTS 10 Exhaust gas line 11 Internal combustion engine
    12 SCR Catalyst 13 Dosing module 131 Transfer pump 132 Pressure line 133 Dosing valve 14 Reservoir 141 Dosing agent solution 142 Quality sensor 15 Suction line 161 Filling level monitor 162 Operating unit 172 Sensor of nitrogen oxides NOx 20-28 Stages of the flow chart implementing the process
    权利要求:
    Claims (13)
    [1" id="c-fr-0001]
    1) Method for correcting a modeled value of a NOx mass (m.NOxus, mod) upstream of an SCR catalyst (12) in the exhaust gas line (10) of a motor vehicle which comprises a NOx sensor (172) downstream of the SCR catalyst (12) and a fill level observer (161), characterized in that both the specific dosing agent demand (DBS) of the fill level observer (161) and also information provided by a quality sensor (162) which monitors the quality of the dosing agent (141) for correcting the NOx mass (mNOxus, mod) upstream of the catalyst SCR (12).
    [0002]
    Method according to Claim 1, characterized in that the concentration of the material contained in the metering agent (141) is determined by means of the quality sensor (162).
    [0003]
    Process according to Claim 1 or 2, characterized in that, to determine a correction coefficient (C) of the NOx mass (m.NOxus, mod) upstream of the SCR catalyst (12), the masses of NH3 and of NOx.
    [0004]
    4) Method according to claim 3, characterized in that to determine the correction coefficient (C) the masses of NH3 and NOx are filtered.
    [0005]
    Method according to Claim 4, characterized in that the threading of the masses NH3 and NOx is optimized to learn the correction coefficient (C) after starting the engine and releasing the regulation within a predefined period of time and continuing to apply them in phases without release of the regulation which are shorter than a predefined duration.
    [0006]
    6) Method according to one of claims 1 to 5, characterized in that the method comprises the following steps: a. checking (22) the quality of the metering agent (141) using the quality sensor (162), b. determine (24) the specific demand of dosing agent (DBS), c. determine (26) the correction coefficient (C).
    [0007]
    Process according to Claim 6, characterized in that before determining the specific demand of the dosing agent (DBS), the value of the NOx nitrogen oxide mass is modeled (21) both upstream (mNOxus, mod) and also downstream (mNOxDs, mod) of the SCR catalyst (12).
    [0008]
    Process according to Claim 6 or 7, characterized in that, before determining the correction coefficient (C), the mass NOx (mNOxDs, sen) downstream of the SCR catalyst (12) is measured (25). help from cat-fear NOx (172).
    [0009]
    Method according to one of Claims 6 to 8, characterized in that before determining (24) the specific demand of the dosing agent (DBS), the currently measured mass NH3 (m.NH3DosAct) is determined (23). ) with the aid of the mass of the dosing agent (24) which has been determined in the dosing system (13) and the previously determined quality of the dosing agent (141).
    [0010]
    Method according to one of Claims 6 to 9, characterized in that (27) the determined correction coefficient (C) is applied to the modeled value of the mass NOx (mNOxus, mod) upstream of the catalyst SCR. (12).
    [0011]
    Method according to one of Claims 3 to 10, characterized in that the correction coefficient (C) is stored in a memory after a driving cycle of the vehicle.
    [0012]
    Process according to one of Claims 3 to 11, characterized in that the deviation of the dosing demand is allocated to a portion of the NOx error upstream of the SCR catalyst (12) and quantity error measured.
    [0013]
    13) Computer program for performing each step of the method according to one of claims 1 to 12, as well as machine-readable memory medium comprising said computer program and electronic control device (16) for executing the method according to one of claims 1 to 12.
    类似技术:
    公开号 | 公开日 | 专利标题
    FR3045104A1|2017-06-16|METHOD FOR CORRECTING A MODELIZED VALUE OF A CONCENTRATION OF NOX NITROGEN OXIDES
    US8893475B2|2014-11-25|Control system for doser compensation in an SCR system
    US8176730B2|2012-05-15|Exhaust gas purification device of internal combustion engine
    US8776503B2|2014-07-15|Method and apparatus for monitoring a reductant injection system in an exhaust aftertreatment system
    FR2986563A1|2013-08-09|METHOD OF MONITORING AN SCR CATALYST
    FR2875843A1|2006-03-31|METHOD FOR MANAGING AN INTERNAL COMBUSTION ENGINE AND DEVICE FOR IMPLEMENTING SAID METHOD
    FR2926848A1|2009-07-31|METHOD FOR DIAGNOSING A DOSING VALVE OF AN EXHAUST GAS TREATMENT DEVICE AND DEVICE FOR IMPLEMENTING THE METHOD.
    JP4658267B2|2011-03-23|Exhaust gas purification device for internal combustion engine
    EP2274506B1|2015-11-04|Method for correcting nitrogen oxide emission models
    EP2078149B1|2011-02-09|Method for the closed-loop control of a urea amount for a nitrogen oxide processing system
    FR3047272A1|2017-08-04|METHOD FOR DETERMINING A MASSIVE FLOW OF AMMONIA
    FR2957116A1|2011-09-09|METHOD FOR MANAGING SCR CATALYST
    FR2869640A1|2005-11-04|METHOD AND DEVICE FOR DETERMINING A REACTIVE AGENT FOR CLEANING THE EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE
    FR2962161A1|2012-01-06|METHOD FOR MANAGING A DOSING SYSTEM OF THE REDUCING AGENT OF A CATALYST SCR
    FR2983523A1|2013-06-07|METHOD FOR MANAGING AN EXHAUST GAS TREATMENT PLANT OF AN INTERNAL COMBUSTION ENGINE
    Wang et al.2015|Model-based fault detection and fault-tolerant control of SCR urea injection systems
    FR2890412A1|2007-03-09|METHOD FOR INTRODUCING A REACTIVE AGENT IN THE EXHAUST GAS ZONE OF A COMBUSTION ENGINE AND DEVICE FOR IMPLEMENTING THE METHOD
    FR2984422A1|2013-06-21|METHOD FOR DETERMINING THE END OF THE INDUCTION MOTION OF A LINEAR PISTON PUMP
    FR3035442A1|2016-10-28|METHOD OF MONITORING AN SCR CATALYST
    EP2140116B1|2011-01-19|Method and system for diagnosing the composition of a tank for controlling an injection on a nitrogen-oxide reduction catalyst
    FR3071010A1|2019-03-15|METHOD FOR MANAGING A SCR CATALYST SYSTEM COMPRISING A FIRST AND A SECOND SCR CATALYST
    US8808630B2|2014-08-19|Exhaust gas catalytic converter system and method for operating an exhaust gas catalytic converter
    EP2917529B1|2017-04-12|Exhaust gas purification device with controlled injection of reducing agent
    FR2921417A1|2009-03-27|METHOD AND DEVICE FOR MANAGING A DOSING VALVE
    EP2193261B1|2012-01-04|Method and system for managing an exhaust gas processing module
    同族专利:
    公开号 | 公开日
    CN106948911B|2021-01-01|
    CN106948911A|2017-07-14|
    DE102015224670A1|2017-06-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP3649253B2|1995-02-09|2005-05-18|株式会社日立製作所|Engine system|
    DE10246505A1|2002-10-05|2004-04-15|Robert Bosch Gmbh|Method for operating an internal combustion engine and the internal combustion engine itself|
    DE10301602A1|2003-01-17|2004-07-29|Robert Bosch Gmbh|Method and device for operating a dosing unit of a catalyst|
    JP4267535B2|2004-07-23|2009-05-27|日野自動車株式会社|NOx reduction rate measurement method for exhaust purification system|
    DE102007004687B4|2007-01-25|2012-03-01|Hydraulik-Ring Gmbh|Volume quantity dispensing unit and method for calibrating the pressure output signal volume quantity characteristic|
    DE102010002620A1|2010-03-05|2011-09-08|Robert Bosch Gmbh|Method for managing selective catalytic reduction catalyst to postprocess exhaust gases in heat engine of motor vehicle to reduce nitrogen oxides in exhaust gases, involves increasing proportioning of reducing agent|
    DE102010060099A1|2010-10-21|2012-04-26|Ford Global Technologies, Llc.|Method for adapting an SCR catalyst in an exhaust system of a motor vehicle|
    CN102000482B|2010-11-15|2013-04-17|无锡科立泰科技有限公司|System and method for controlling oxynitride removal|
    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|
    EP2684597A1|2012-07-14|2014-01-15|Deutz AG|Method for reducing nitrogen oxides in diesel engine exhaust|
    DE102012221574A1|2012-07-31|2014-02-06|Robert Bosch Gmbh|Method for operating a provided for the aftertreatment of exhaust gases of an internal combustion engine SCR catalyst|
    CN102926847B|2012-11-30|2015-06-17|潍柴动力股份有限公司|Selective catalytic reduction urea spouting correction method, device and system|
    CN103016112B|2012-12-18|2015-06-17|潍柴动力股份有限公司|Method and system for controlling emitted dose of urea solution by SCR |DE102016224667A1|2016-12-12|2018-06-14|Robert Bosch Gmbh|Method for operating a reagent dosing system, apparatus for carrying out the method, control unit program and control unit program product|
    US20190063285A1|2017-08-28|2019-02-28|GM Global Technology Operations LLC|Emissions control system of a combustion engine exhaust system|
    DE102017218480A1|2017-10-16|2019-04-18|Robert Bosch Gmbh|A method of determining NOx concentration and NH3 slip downstream of an SCR catalyst|
    FR3078743B1|2018-03-08|2020-10-09|Psa Automobiles Sa|PROCEDURE FOR CORRECTING AN ESTIMATE OF A QUANTITY OF NITROGEN OXIDES AS A FUNCTION OF A HYGROMETRY LEVEL|
    CN112576351A|2020-11-27|2021-03-30|潍柴动力股份有限公司|Method, device, equipment and medium for obtaining engine nitrogen oxide model value|
    法律状态:
    2017-12-19| PLFP| Fee payment|Year of fee payment: 2 |
    2018-05-25| PLSC| Search report ready|Effective date: 20180525 |
    2019-12-19| PLFP| Fee payment|Year of fee payment: 4 |
    2021-09-10| ST| Notification of lapse|Effective date: 20210806 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015224670.1A|DE102015224670A1|2015-12-09|2015-12-09|Method for correcting a model value of a NOx concentration|
    [返回顶部]