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Methods for monitoring and/or controlling the performance of selective catalytic reduction devices

A technology with selectivity and performance, which is applied in the direction of electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, exhaust devices, etc.

Inactive Publication Date: 2018-10-09
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ensure NO by SCR X Species are properly reduced, however minimizing reductant leakage from the SCR remains a challenge

Method used

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  • Methods for monitoring and/or controlling the performance of selective catalytic reduction devices
  • Methods for monitoring and/or controlling the performance of selective catalytic reduction devices
  • Methods for monitoring and/or controlling the performance of selective catalytic reduction devices

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Experimental program
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Embodiment Construction

[0011] Various embodiments of the invention are described herein. It is to be understood, however, that the disclosed embodiments are merely examples and that other embodiments may take various and alternative forms. The figures are not necessarily to scale and some features may be exaggerated or minimized, showing details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention. As will be understood by persons of ordinary skill in the art, various features shown and described with reference to any one figure may be combined with features shown in one or more other figures to form features not expressly shown or described herein. the embodiment. Combinations of features shown provide representative embodiments for typical applications. However, various combinations and modifications...

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Abstract

Method for controlling and / or monitoring the performance of selective catalytic reduction devices (SCR) and systems incorporating the same are provided. Systems can include a SCR configured to receivereductant at a variable dosing rate, an upstream NOx sensor, and a downstream NOx sensor. Methods can include correlating a SCR reductant dosing signal direction with a SCR downstream NOx signal direction, and determining one or more of NOx breakthrough through the SCR and reductant slip through the SCR. Methods can further comprise identifying reductant slip through the SCR using an upstream NOxsensor signal and a downstream NOx sensor signal. Methods can further comprise comparing an upstream NOx signal to a downstream NOx signal, determining a system objective, and adapting the SCR reductant dosing rate to achieve the system objective in order to identify a faulty upstream NOx sensor.

Description

Background technique [0001] During the combustion cycle of an internal combustion engine (ICE), an air / fuel mixture is provided to the cylinders of the ICE. The air / fuel mixture is compressed and / or ignited and combusted to provide output torque. After combustion, the ICE's pistons force the exhaust gas in the cylinder to seep through the exhaust valve opening and into the exhaust system. Exhaust gases from ICEs (especially diesel engines) are heterogeneous mixtures containing gaseous emissions such as carbon monoxide (CO), unburned carbon Hydrogen compounds, nitrogen oxides (NO x ) and sulfur oxides (SO X ). For example, liquids may include water and hydrocarbons. [0002] Exhaust gas treatment systems may employ catalysts in one or more components configured to perform aftertreatment processes such as reduction of NO x To produce more allowable exhaust gas components: Nitrogen (N 2 ) and water (H 2 O). A method for reducing NO x The exhaust gas treatment technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N11/00
CPCF01N3/208F01N11/00F01N3/2066F01N11/002F01N2550/02F01N2560/026F01N2610/02F01N2900/0408F01N2900/1402F01N2900/1616F01N2900/1622Y02T10/12Y02T10/40
Inventor D·爱德华兹S·芬克P-I·李
Owner GM GLOBAL TECH OPERATIONS LLC