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Ammonia storage set-point control for selective catalytic reduction applications

A selective, ammonia storage technology, applied in the direction of electronic control, mechanical equipment, chemical instruments and methods of exhaust gas treatment devices, which can solve problems such as diatomic nitrogen emissions

Inactive Publication Date: 2013-01-02
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction of ammonia with NOx in the SCR catalyst reduces NOx and results in the emission of diatomic nitrogen and water

Method used

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  • Ammonia storage set-point control for selective catalytic reduction applications
  • Ammonia storage set-point control for selective catalytic reduction applications
  • Ammonia storage set-point control for selective catalytic reduction applications

Examples

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Embodiment Construction

[0041] The following description is merely exemplary in nature, and is in no way intended to limit the present invention, its application or uses. For the sake of clarity, the same reference numbers will be used in the drawings to refer to similar elements. The term "at least one of A, B, and C" used herein should be interpreted as meaning the use of non-exclusive logic "or" logic (A or B or C). It should be understood that the steps in the method can be executed in a different order as long as the principle of the present invention is not changed.

[0042] The term "module" as used herein refers to an application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated or grouped) that executes one or more software or firmware programs, and memory, combinational logic circuits, And / or other suitable components that provide the described functions.

[0043] The selective catalytic reduction (SCR) system reduces nitrogen oxides (NOx) in exhaust gas...

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PUM

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Abstract

A system includes an injector control module and an SCR optimization module. The injector control module controls an amount of ammonia (NH3) stored in a selective catalytic reduction (SCR) catalyst to maintain a first storage level. The SCR optimization module determines whether the first storage level maximizes a conversion efficiency of the SCR catalyst at a first temperature and minimizes a probability of NH3 slip when the temperature of the SCR catalyst transitions from the first temperature to a second temperature. The injector control module controls the amount of NH3 stored in the SCR catalyst to maintain a second storage level when the second storage level maximizes the efficiency of the SCR catalyst relative to the first storage level and minimizes the probability of NH3 slip relative to the first storage level.

Description

[0001] Cross references to related applications [0002] This application claims the rights of U.S. Provisional Application No. 61 / 224,653 filed on July 10, 2009. The disclosure of the aforementioned application is incorporated herein by reference in its entirety. Technical field [0003] The present invention relates to emission control systems, and in particular to controlling ammonia storage levels in selective catalytic reduction systems. Background technique [0004] The purpose of the background art description provided herein is to introduce the background of the present invention in general. The work of the inventors currently mentioned-limited to what is described in this background section-and aspects of this description that may not otherwise constitute prior art at the time of submission, neither expressly nor implied Ground is admitted as prior art for the present invention. [0005] Engine exhaust contains carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00F01N3/08B01D53/90B01D53/56
CPCF01N2560/06Y02T10/24F01N2560/14F01N3/105F01N13/02F01N2900/1616F01N2900/1402F01N2560/026F01N3/208F01N2900/1622F01N3/103F01N2610/02F01N13/009Y02T10/12
Inventor K·A·加迪A·甘戈帕迪亚伊
Owner GM GLOBAL TECH OPERATIONS LLC