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US 2006/0137329 A1Published application
Filter desulfation system and method
AssigneeCaterpillar Inc.
InventorsMichael Lowe, Wade Robel, Maarten Verkiel, James Driscoll
Life of this patent
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Abstract
A method of removing sulfur from a filter system of an engine includes continuously passing an exhaust flow through a desulfation leg of the filter system during desulfation. The method also includes sensing at least one characteristic of the exhaust flow and modifying a flow rate of the exhaust flow during desulfation in response to the sensing.
Claims26
A method of removing sulfur from a filter system of an engine, comprising:
- continuously passing an exhaust flow through a desulfation leg of the filter system during desulfation;
- sensing at least one characteristic of the exhaust flow;
- and
- modifying a flow rate of the exhaust flow during desulfation in response to the sensing.
1 more element
A method of removing sulfur from a NOx absorber of an engine filter system, comprising:
- heating the NOx absorber to a desired temperature;
- injecting a reductant into an exhaust flow upstream of the NOx absorber;
- and
- holding the desired temperature substantially constant during desulfation.
1 more element
A filter system having desulfation capabilities, comprising:
- a first leg;
- and
- a second leg, at least one of the legs including a valving mechanism configured to direct a portion of an exhaust flow from an engine through the respective leg, the valving mechanism modifying a flow rate of the portion, during desulfation, in response to a sensed temperature.
Dependencies are inferred from the claim text.