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    METHOD AND SYSTEM FOR COMPENSATING NOX SENSOR MEASUREMENT ERROR
    2.
    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.

    Selective catalytic reduction steady state ammonia slip detection with positive perturbation
    4.
    发明授权
    Selective catalytic reduction steady state ammonia slip detection with positive perturbation 有权

    公开(公告)号：US10344654B2

    公开(公告)日：2019-07-09

    申请号：US15699210

    申请日：2017-09-08

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Luca Lauritano ,  Luis Daniel Guerrero Cruz

    IPC: C01C1/18 ,  F01N3/08 ,  F01N3/20 ,  C01B21/04 ,  C01B21/20

    Abstract: Described herein is a method for detecting steady state ammonia slip for a motor vehicle having an internal combustion engine and an emissions control system. The emissions control system includes a selective catalytic reduction (SCR) device, a NOx sensor, and a controller. The controller executes a method for ammonia slip detection that includes determining if the SCR device is at steady state, comparing a NOx measurement from the NOx sensor with a predicted NOx value. If the NOx measurement exceeds the predicted NOx value by a threshold, perturbing a reductant injection, the perturbation having a selected magnitude and a selected duration. The method also includes measuring a NOx value resulting from the perturbation and computing a gradient thereof relative to the measured NOx, and ascertaining if a gradient of the NOx resulting from the perturbation exceeds a threshold and identifying a reductant slip condition if so.

    Underflow selective catalytic reduction steady state ammonia slip detection with positive perturbation
    9.
    发明授权
    Underflow selective catalytic reduction steady state ammonia slip detection with positive perturbation 有权

    公开(公告)号：US10358965B2

    公开(公告)日：2019-07-23

    申请号：US15804054

    申请日：2017-11-06

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Luca Lauritano ,  Luis Daniel Guerrero Cruz ,  Francesco Irlando

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

    Abstract: A method for treating exhaust gas from an internal combustion engine including, determining if a steady state condition exist and perturbing a reductant injection corresponding the steady state. Measuring a first and a second NOx values corresponding to the steady state and resulting from the perturbation, and computing a gradient of the NOx values relative to the steady state respectively. The method also includes comparing the gradient of the second NOx value with one of the first NOx value, if the gradient of the first NOx value is within a selected range of the gradient of the second NOx value, identifying poor efficiency operation for the engine and setting an estimated reductant storage at zero. Otherwise if the gradient of the second NOx value exceeds a selected threshold, identifying a reductant slip condition and setting the estimated storage at maximum, if not, making no corrections in estimated storage.

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