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    SELECTIVE CATALYTIC REDUCTION STEADY STATE AMMONIA SLIP AND REDUCTANT BREAKTHROUGH DETECTION
    1.
    发明申请
    SELECTIVE CATALYTIC REDUCTION STEADY STATE AMMONIA SLIP AND REDUCTANT BREAKTHROUGH DETECTION 审中-公开

    公开(公告)号：US20190010851A1

    公开(公告)日：2019-01-10

    申请号：US15643987

    申请日：2017-07-07

    Applicant: GM Global Technology Operations LLC

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

    IPC: F01N11/00 ,  F01N3/20 ,  F02D41/00 ,  B01D53/94

    Abstract: Technical solutions are described for an emissions control system for a motor vehicle including an internal combustion engine. An example emissions control system for treating exhaust gas in a motor vehicle including an internal combustion engine. For example, the emissions control system includes a selective catalytic reduction (SCR) device, an NOx sensor, and a controller that is configured to detect a NH3 slip of the SCR device. The controller detects the NH3 slip by modulating an engine out NOx from an engine, demodulating the engine out NOx from the engine to original state, and measuring NOx upstream and downstream from the SCR device after the modulation. Further, the controller determines the NH3 slip by comparing gradients in the NOx measurement with one or more predetermined thresholds.

    PREDICTIVE CONTROL FOR SLIP AND BREAKTHROUGH DETERMINATION OF SELECTIVE CATALYTIC REDUCTION SYSTEMS
    2.
    发明申请
    PREDICTIVE CONTROL FOR SLIP AND BREAKTHROUGH DETERMINATION OF SELECTIVE CATALYTIC REDUCTION SYSTEMS 审中-公开

    公开(公告)号：US20180258813A1

    公开(公告)日：2018-09-13

    申请号：US15451447

    申请日：2017-03-07

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David P. Quigley ,  David Edwards ,  Sarah Funk ,  Anirban Sett

    IPC: F01N3/20 ,  F02D41/02 ,  F01N11/00 ,  B01D53/94

    Abstract: Disclosed are SCR predictive control systems, methods for using such control systems, and motor vehicles with SCR employing predictive control. A method for regulating operation of an SCR system includes receiving sensor signals indicative of NOx output downstream from an SCR catalyst, and sensor signals indicative of exhaust gas temperature upstream from the SCR catalyst. The method determines if a model error condition has occurred for the NOx output signal and, responsive to such an occurrence, modulating dosing injector output for at least a calibrated designated time period. Upon expiration of the designated time period, the dosing injector is activated and commanded to inject reductant in accordance with a modulated dosing value. After the dosing injector injects the modulated dosing value of reductant, the method determines if the SCR system is underdosing or overdosing based on a response shape of signals received from the outlet NOx content sensor.

    DOSING CONTROL FOR SCR SYSTEMS
    3.
    发明公开
    DOSING CONTROL FOR SCR SYSTEMS 审中-公开

    公开(公告)号：US20240240580A1

    公开(公告)日：2024-07-18

    申请号：US18156153

    申请日：2023-01-18

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： David P. Quigley ,  Sarah Funk

    IPC: F01N3/20

    CPC classification number: F01N3/208 ,  F01N2560/026 ,  F01N2610/02 ,  F01N2900/1602

    Abstract: Methods and systems for controlling treatment of exhaust in a emission control system of a platform having an combustion system and one or more selective catalyst reduction catalysts (SCR) is provided. In an exemplary embodiment, the system includes: one or more sensors configured to obtain sensor data pertaining to an SCR temperature for the SCR; and a processor that is coupled to the one or more sensors and configured to at least facilitate controlling treatment of the exhaust based on the SCR temperature.

    METHODS FOR CONTROLLING SELECTIVE CATALYTIC REDUCTION SYSTEMS
    8.
    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.

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