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    METHOD AND SYSTEM FOR COMPENSATING NOX SENSOR MEASUREMENT ERROR
    11.
    发明申请
    METHOD AND SYSTEM FOR COMPENSATING NOX SENSOR MEASUREMENT ERROR 审中-公开

    公开(公告)号：US20200063633A1

    公开(公告)日：2020-02-27

    申请号：US16109287

    申请日：2018-08-22

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Luca Lauritano ,  Luis Daniel Guerrero Cruz ,  Giuseppe Mazzara Bologna ,  Andrea Dutto ,  Sarah Funk

    IPC: F01N11/00 ,  F01N3/20

    Abstract: Systems and associated methods of treating diesel exhaust in a vehicle are disclosed. An example method includes providing an exhaust aftertreatment device in an exhaust tailpipe, and a first nitrogen oxide (NOx) sensor upstream of the exhaust aftertreatment device, with the exhaust aftertreatment device configured to reduce NOx present in an exhaust flow through the exhaust aftertreatment device with a treatment fluid applied to the exhaust flow. This example method may also include measuring a concentration of NOx in the exhaust flow with the first sensor, determining an error in the measurement of the NOx concentration, and applying a learning corrective adjustment in a subsequent measurement of the NOx concentration in the exhaust flow in response to that determination. A first magnitude of the learning corrective adjustment may be based at least in part upon a second magnitude of the error in the measurement.

    Methods for assessing the condition of a selective catalytic reduction devices
    13.
    发明授权
    Methods for assessing the condition of a selective catalytic reduction devices 有权

    公开(公告)号：US10450924B2

    公开(公告)日：2019-10-22

    申请号：US15834556

    申请日：2017-12-07

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Sarah Funk ,  Michael A. Smith ,  Giuseppe Mazzara Bologna

    IPC: F01N3/00 ,  F01N3/20 ,  F01N11/00 ,  B01D53/94

    Abstract: Selective catalytic reduction device (SCR) assessment methods include, while communicating exhaust to the SCR, determining a first temperature differential (dT) between a modeled exotherm phase temperature and a measured SCR exotherm outlet exhaust temperature, comparing the first dT to a first threshold, and determining that the SCR performance is suitable if the first dT is below the first threshold, or, if the first dT is above the first threshold, communicating exhaust gas to the SCR during a water endotherm phase, determining a second dT between a modeled endotherm phase temperature and a measured SCR endotherm phase outlet exhaust temperature, comparing the second dT to a second threshold, and determining that the SCR performance is suitable if the second dT is above the second threshold, or determining that the SCR performance is unsuitable if the second dT is below the second threshold. Performance can be SCR reductant storage capacity.

    METHODS FOR CONTROLLING SELECTIVE CATALYTIC REDUCTION SYSTEMS
    14.
    发明申请
    METHODS FOR CONTROLLING SELECTIVE CATALYTIC REDUCTION SYSTEMS 审中-公开

    公开(公告)号：US20190178131A1

    公开(公告)日：2019-06-13

    申请号：US15838823

    申请日：2017-12-12

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Sarah Funk ,  Charles E. Dean ,  Po-I Lee ,  David P. Quigley

    IPC: F01N3/20

    Abstract: A selective catalytic reduction device (SCR) system performs intrusive steady state dosing correction (SSDC) when a NOx error between a predicted and measured downstream NOx value exceeds a threshold. In SSDC, if NOx breakthrough or NH3 slip is detected above a SSDC threshold, a short term reductant dosing adaptation occurs. Optionally long term dosing adaptations occur if the magnitude of previous short term adaptations exceed a short term adaptation threshold. If SSDC is insufficiently improving SCR performance based on the number of intrusive events occurring within a period of time and the change in NOx error during the time period, a method includes modifying the SSDC protocol by one or more of increasing the duration of short term adaptations, decreasing the SSDC threshold, and reducing the short term adaptation threshold. The method further includes subsequently inhibiting intrusive events from occurring.

    Methods for controlling and detecting catalyst poisoning of selective catalytic reduction devices
    15.
    发明授权
    Methods for controlling and detecting catalyst poisoning of selective catalytic reduction devices 有权

    公开(公告)号：US10215072B2

    公开(公告)日：2019-02-26

    申请号：US15467312

    申请日：2017-03-23

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Michael A. Smith ,  Praveen S. Chavannavar ,  Po-I Lee ,  Sarah Funk ,  Thomas LaRose, Jr.

    IPC: F01N3/20 ,  F01N9/00 ,  F01N3/021

    Abstract: Method for controlling and detecting ammonium nitrate and/or ammonium nitrite poisoning within selective catalytic reduction (SCR) devices and systems incorporating the same are provided. Methods can include detecting a SCR inlet exhaust gas NO2:NOx ratio above a poisoning NOx flux threshold, detecting a SCR temperature below a poisoning temperature threshold, and determining SCR catalyst poisoning. Methods can further include performing a SCR catalyst cleaning strategy, wherein the SCR cleaning strategy comprises heating the SCR catalyst composition to a temperature above the poisoning temperature threshold. Cleaning strategies can including utilizing a heater, implementing a post-injection, after-injection, and/or auxiliary injection engine strategy wherein the engine is configured to supply exhaust gas to the SCR. Methods can further include arresting reductant dosing, identifying an opportunistic regeneration opportunity, and/or inhibiting performance of an appurtenant oxidation catalyst subsequent to determining SCR catalyst poisoning. The SCR catalyst composition can comprise iron and/or copper.

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