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Multi-stage regeneration of a particulate filter

A technology of particulate filter and particulate matter, which is applied in the direction of exhaust device, noise reduction device, exhaust treatment device, etc., and can solve heating and other problems

Active Publication Date: 2013-06-12
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

This will cause urea deposits in the SCR catalyst to decompose at a high rate when the catalyst is heated, potentially heating the SCR catalyst to undesirably high temperatures

Method used

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  • Multi-stage regeneration of a particulate filter
  • Multi-stage regeneration of a particulate filter
  • Multi-stage regeneration of a particulate filter

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Embodiment Construction

[0016] Before describing embodiments of the disclosed regenerated particulate filter, an example application environment is described. refer to figure 1 , shows a direct injection internal combustion engine 10 comprising a plurality of combustion chambers (one of which is shown at 30 ) and controlled by an electronic engine controller 12 . Combustion chamber 30 of engine 10 includes combustion chamber walls 32 with piston 36 positioned therein and connected to crankshaft 40 . In one example, piston 36 includes grooves or pockets (not shown) to create a selected level of stratified or homogeneous air-fuel charge. Alternatively, disc pistons can also be used.

[0017] Combustion chamber 30 communicates with intake manifold 44 and exhaust manifold 48 via intake valve 52 and exhaust valve 54 as shown. Fuel injector 66 is shown coupled directly to combustion chamber 30 for delivering liquid fuel directly therein in proportion to the pulse width of signal fpw received from contro...

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Abstract

A method of regenerating a particulate filter utilizes two temperature levels, with the first, lower, level removing stored hydrocarbons and urea from an SCR catalyst. The second, higher, level then follows for filter regeneration. Because the regeneration occurs after the SCR catalyst has been purged of hydrocarbons and urea, for example, the temperature experienced by the SCR catalyst during regeneration is reduced. In this way, SCR degradation may be reduced.

Description

technical field [0001] The present invention relates to the regeneration of exhaust system particulate filters. Background technique [0002] Engines, including but not limited to diesel engines, operating at lean conditions and high compression ratios can provide fuel economy benefits over conventional gasoline engines. The aftertreatment system for such an engine may include a particulate filter to trap particulate matter in the engine exhaust, and may include a Selective Catalytic Reduction (SCR) system to treat nitrogen oxides (NO x )emission. [0003] One type of SCR system uses a catalyst and an injector for injecting an aqueous urea solution into the exhaust stream upstream of the catalyst. Urea breaks down to ammonia, which acts as a catalyst to reduce NO x the reducing agent. Ammonia is mainly produced from urea through the following two reaction steps. [0004] (1) NH 2 -CO-NH 2 (g or 1)→NH 3 (g)+HNCO(g) [0005] (2)HNCO(g)+H 2 O(g)→NH 3 (g)+CO 2 (g) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/023F01N3/20
CPCF01N9/002F01N3/035Y02T10/24F01N13/02F02D41/029Y02T10/47F01N3/208F01N2900/1622F01N13/009Y02T10/12Y02T10/40F01N3/023
Inventor 徐立峰威廉·刘易斯·亨德森·沃特金斯威廉·查尔斯·鲁奥纳乔治·韦德·格雷厄姆罗伯特·沃尔特·麦卡比
Owner FORD GLOBAL TECH LLC
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