Robust design of diagnostic enabling conditions for scr nox conversion efficiency monitor

A catalytic converter and diagnostic testing technology, which is applied to diagnostic devices, chemical instruments and methods, and mechanical equipment of exhaust gas treatment devices, and can solve problems such as false indications of faulty catalytic converters
CN101798947AInactive Publication Date: 2010-08-11GM GLOBAL TECH OPERATIONS LLC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GM GLOBAL TECH OPERATIONS LLC
Publication Date
2010-08-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for controlling a malfunction catalyst diagnostic test that determines a malfunction status of a catalyst within a selective catalytic reduction device includes monitoring an exhaust gas flow within an aftertreatment system, estimating an effect of the exhaust gas flow on an estimated reductant storage on a catalyst within the selective catalytic reduction device, and selectively disabling the malfunction catalyst diagnostic test based upon the estimating the effect of the exhaust gas flow on the estimated reductant storage.
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Description

Technical field

[0001] The present invention relates to aftertreatment control of NOx emissions in internal combustion engines. Background technique

[0002] The statements in this part only provide background information related to the present invention and may not constitute prior art.

[0003] Emission control is an element in engine design and engine control. NOx, known as a byproduct of combustion, is produced by nitrogen molecules and oxygen molecules present in engine intake that splits at high combustion temperatures. The NOx generation rate and the combustion process follow a well-known relationship. For example, a high NOx generation rate is related to a high combustion temperature and long-term exposure of air molecules to a high temperature. In vehicle design, it is desired to reduce NOx generated during combustion and manage NOx in exhaust aftertreatment systems.

[0004] Once NOx molecules are produced in the combustion chamber, they can be converted back to nitrogen...

Claims

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