Anirban Sett

US Patent:

20190010848, Jan 10, 2019

Filed:

Jul 10, 2017

Appl. No.:

15/645437

Inventors:

- Detroit MI, US
Anirban Sett - Farmington Hills MI, US

International Classification:

F01N 3/20

Abstract:

Technical solutions are described for an emissions control system for controlling a selective catalytic reduction (SCR) device of an exhaust system of an internal combustion engine. An example computer-implemented method includes governing a reductant dosing in the SCR device. For example, governing the dosing includes computing a reductant dosing rate based on a chemical model of the SCR device. Further, the governing includes determining a temperature modulation factor based on inlet temperature of exhaust gas input for the SCR. The method further includes adjusting the reductant dosing rate by scaling the reductant dosing rate by the temperature modulation factor. The method further includes causing an amount of reductant to be injected into an SCR catalyst according to the adjusted reductant dosing rate.

US Patent:

20180258813, Sep 13, 2018

Filed:

Mar 7, 2017

Appl. No.:

15/451447

Inventors:

- Detroit MI, US
David Edwards - Rochester Hills MI, US
Sarah Funk - Canton MI, US
Anirban Sett - Farmington Hills MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

F01N 3/20
F02D 41/02
F01N 11/00
B01D 53/94

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.