公开(公告)号：US20180008932A1

公开(公告)日：2018-01-11

申请号：US15206481

申请日：2016-07-11

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： David P. Quigley ,  Sarah Funk ,  Pablo E. Hernandez Garcia ,  Amr M. Radwan

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

CPC classification number: B01D53/9495 ,  B01D53/9409 ,  B01D53/9431 ,  B01D2251/2062 ,  F01N3/2066 ,  F01N3/208 ,  F01N11/002 ,  F01N2550/02 ,  F01N2560/025 ,  F01N2560/026 ,  F01N2610/02 ,  F01N2900/0402 ,  F01N2900/1404 ,  Y02T10/24 ,  Y02T10/47

Abstract: A method to reduce NOx breakthrough and NH3 slip is provided when the SCR system is increasing in temperature and/or increasing exhaust gas mass flow. The method includes the steps of monitoring states of parameters of the exhaust gas upstream of an SCR catalyst where the states of parameters include at least one of the inlet temperature or the exhaust gas mass flow; identifying one of a temperature increase or an increased exhaust gas mass flow at the SCR inlet; identifying a new lower ammonia set-point or storage concentration for the SCR; and identifying the rate of NH3 consumption. The method further includes the step of determining an “intervening phase” a small dosage of DEF is continued during the intervening phase.

公开(公告)号：US20220099642A1

公开(公告)日：2022-03-31

申请号：US17032551

申请日：2020-09-25

Applicant: GM Global Technology Operations LLC

Inventor： David P. Quigley ,  Sarah Funk ,  Kevin J. McKay ,  Scott R. Zechiel ,  Ruggiero Chiariello

IPC: G01N33/00 ,  G01M15/10

Abstract: A method for reducing sensor noise in an automobile vehicle NOx sensor offset diagnostic includes: connecting an exhaust system to an engine of an automobile vehicle; sensing a condition of the exhaust system using at least one NOx sensor; identifying when the at least one NOx sensor is at a low noise condition; and running a diagnostic to identify conditions of the at least one NOx sensor. The method further includes selecting one of the low noise condition as the engine in an after-run condition or as the engine in an engine idle condition.

公开(公告)号：US20210033010A1

公开(公告)日：2021-02-04

申请号：US16524419

申请日：2019-07-29

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Nicholas GIRARDI ,  Sarah Funk ,  David P. Quigley

IPC: F01N3/08 ,  F01N3/20

Abstract: A diesel exhaust fluid (DEF) control system includes: a target module configured to determine a target rate of injection of a DEF by a DEF injector; an adjustment module configured to determine an adjustment based on a concentration of urea in the DEF; an adjusting module configured to adjust the target rate based on the adjustment to produce an adjusted rate of injection of the DEF by the DEF injector; and an injector control module configured to control injection of the DEF by the DEF injector based on the adjusted rate.

公开(公告)号：US10378463B2

公开(公告)日：2019-08-13

申请号：US15645424

申请日：2017-07-10

Applicant: GM Global Technology Operations LLC

Inventor： David P. Quigley ,  Sarah Funk

IPC: F01N3/10 ,  F01N3/20 ,  F01N11/00 ,  F01N3/035 ,  F02D41/02 ,  F02D41/14 ,  F02D41/26

Abstract: Technical solutions are described for an emissions control system for a motor vehicle including an internal combustion engine. The emissions control system includes a selective catalytic reduction (SCR) device, an NOx sensor, and a controller for ammonia slip detection. The ammonia slip detection includes comparing an NOx measurement from the NOx sensor with a predicted NOx value. In response to the NOx measurement exceeding the predicted NOx value by a threshold value, the threshold value being calibrated to a first predetermined value, the threshold value is calibrated to a second predetermined value, a timer is initiated to a predetermined duration, and during the predetermined duration of the timer, in response to a second NOx measurement from the NOx sensor exceeding the predicted NOx value by the threshold value set to the second predetermined value, a reductant dosing rate of the SCR device is adapted according to the second predetermined value.

公开(公告)号：US10323559B1

公开(公告)日：2019-06-18

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.

公开(公告)号：US10247076B2

公开(公告)日：2019-04-02

申请号：US15481941

申请日：2017-04-07

Applicant: GM Global Technology Operations LLC

Inventor： Michael A. Smith ,  David P. Quigley ,  Sarah Funk ,  Enrik Fetolli

IPC: F01N3/00 ,  F01N3/20 ,  F01N3/08 ,  F01N11/00

Abstract: A vehicle includes an engine that combusts an air/fuel mixture to produce an exhaust gas stream containing oxides of nitrogen (NOx). A dosing system injects an amount of ammonia (NH3) into the exhaust gas stream based on an initial NH3 injection set point value. A selective catalyst reduction (SCR) device absorbs an amount of the NH3 contained in the exhaust gas stream and reduces an amount of NOx. An electronic hardware controller predicts an NH3 slip condition during which a portion the absorbed NH3 will slip from the SCR device, and modifies the initial NH3 injection set point value based on the predicted NH3 slip condition. The controller further generates a modified NH3 injection set point signal indicating an adjusted amount of the NH3 to inject during the predicted NH3 slip condition. The dosing system adjusts the amount of injected NH3 based on the modified NH3 injection set point signal.

公开(公告)号：US10082061B1

公开(公告)日：2018-09-25

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 ,  F01N11/00 ,  F02D41/02 ,  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.