System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems

A selective and reducing agent technology, applied in the electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, machines/engines, etc.

Inactive Publication Date: 2012-05-09
GM GLOBAL TECH OPERATIONS LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conversion efficiency determination module determines the conversion efficiency of the SCR catalyst

Method used

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  • System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems
  • System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems
  • System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems

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Embodiment Construction

[0045] The following description is merely exemplary in nature and is in no way intended to limit the invention and its application or uses. For purposes of clarity, the same reference numbers have been used in the drawings to identify similar elements. As used herein, the phrase at least one of A, B, and C should be construed as a logical (A or B or C) using a non-exclusive logical or. It should be understood that steps within a method may be executed in different order without altering the principles of the present invention.

[0046] As used herein, the term module may refer to, include, or be a part of: an application-specific integrated circuit (ASIC); an electronic circuit; a combinational logic circuit; a field-programmable gate array (FPGA); dedicated, or grouped); other suitable components providing the described functionality; or a combination of some or all of the above, for example in the form of a system on a chip. The term module may include memory (shared, ded...

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Abstract

The invention relates to a system and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems, in particular, a control system for a selective catalytic reduction (SCR) system includes a conversion efficiency determination module, an ammonia slip determination module, and a diagnostic module. The conversion efficiency determination module determines a conversion efficiency of an SCR catalyst. The ammonia slip determination module determines an amount of ammonia slip across the SCR catalyst when the conversion efficiency is less than a predetermined threshold. The diagnostic module determines pass / fail statuses of a reductant supply and the SCR catalyst based on the amount of ammonia slip and at least one ammonia slip threshold.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application 61 / 390,289, filed October 6, 2010. The disclosure of the above application is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates to emission treatment systems, and more particularly to a system and method for detecting low quality reductant and catalyst degradation in a selective catalytic reduction (SCR) system. Background technique [0004] The background description provided herein is for the purpose of generally presenting the context of the disclosure. The work of the presently named inventors to the extent described in this Background section, and aspects of this description which did not constitute prior art at the time of filing, are neither expressly nor impliedly admitted to be relevant to the present invention conflicting prior art. [0005] Internal combustion engines combine air and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00
CPCF01N2550/05F01N11/00Y02T10/24F01N13/02Y02T10/47F01N2900/1621F01N2900/1616F01N3/208F01N2550/02F01N13/009Y02T10/12Y02T10/40
Inventor S. P. 列维乔基Y-Y. 王B. B. 汤普森
Owner GM GLOBAL TECH OPERATIONS LLC
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