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

Inactive Publication Date: 2010-08-11
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, depending on whether the reduction in conversion efficiency is caused by the faulty d

Method used

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

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Embodiment Construction

[0028] Referring now to the accompanying drawings, which are shown only to illustrate certain exemplary embodiments and are not intended to limit them, figure 1 It is a partial view of an exemplary diesel engine according to the present invention. The engine 10 generally includes a plurality of cylinders 12 with a reciprocating piston 14 connected to a crankshaft 16 therein. The present invention is generally applicable to direct injection four-stroke compression ignition engines. The end of the cylinder is closed by the cylinder head 18 so that the cylinder and the piston define a variable volume combustion chamber 20.

[0029] The cylinder head is provided with an intake valve 22, which controls the timing and flow of intake air into the cylinder during the intake stroke of the piston. The exhaust valve 24 in the cylinder head controls the timing and flow of exhaust products from the combustion chamber during the exhaust stroke of the piston. In the engine shown, each cylinde...

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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.

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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Application Information

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IPC IPC(8): F01N11/00F01N3/20B01D53/94
CPCF01N3/2066F01N11/00Y02T10/24Y02T10/47Y02T10/12Y02T10/40
Inventor Y·-Y·王O·N·亚纳基夫C·E·索尔布里格
Owner GM GLOBAL TECH OPERATIONS LLC
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