System and method for removing SOx and particulate matter from an emission control device

a technology of emission control device and emission control system, which is applied in the direction of exhaust treatment electric control, separation process, instruments, etc., can solve the problems of increasing the hydrocarbon emissions during the regeneration of the particulate filter, the known control system, and the drawback of the engine fuel economy
US20030113249A1Inactive Publication Date: 2003-06-19FORD GLOBAL TECH LLC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
FORD GLOBAL TECH LLC
Publication Date
2003-06-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

A system and method for removing SOx and particulate matter from an emission control device receiving exhaust gases from an engine is provided. The method includes adding a reductant to the exhaust gases to increase a temperature of the emission control device above a threshold temperature. The method further includes ceasing adding the reductant to the exhaust gases to remove particulate matter from the device. The method further includes adding additional reductant to the exhaust gases to remove SOx from the device.
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Description

[0001] The present invention relates to a system and method for removing SOx and particulate matter from an emission control device coupled to an engine.DESCRIPTION OF THE RELATED ART

[0002] A known engine control system for purging SOx and particulate matter from a combined particulate filter and NOx trap is disclosed in Japanese Patent 06-272541A. In particular, the control system operates the engine lean while adding reductant to exhaust gases to increase a temperature of the exhaust gases. The increased temperature is used to oxidize particulate matter stored in the combined filter and trap. This process is called particulate filter regeneration. Thereafter, the control system adds more reductant to purge sulphur-oxides (SOx) from the combined filter and trap.

[0003] The known control system, however, has a significant drawback. In particular, the control system supplies reductant / fuel to exhaust gases during the purging of particulate matter. As a result, the fuel economy of the ...

Claims

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