IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0022692
(2004-12-28)
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등록번호 |
US-7770386
(2010-08-30)
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발명자
/ 주소 |
- Lowe, Michael D.
- Robel, Wade J.
- Verkiel, Maarten
- Driscoll, James J.
|
출원인 / 주소 |
|
대리인 / 주소 |
Finnegan, Henderson, Farabow, Garrett & Dunner
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인용정보 |
피인용 횟수 :
4 인용 특허 :
11 |
초록
▼
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 flo
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.
대표청구항
▼
What is claimed is: 1. 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; injecting a flow of reductant into the e
What is claimed is: 1. 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; injecting a flow of reductant into the exhaust flow; and modifying a flow rate of the reductant and a flow rate of the exhaust flow during desulfation in response to the sensing such that a desired desulfation temperature is held substantially constant. 2. The method of claim 1, wherein the desired desulfation temperature is in the range of approximately 500° C. to approximately 800° C. 3. The method of claim 1, further including maintaining a desired catalyst lambda during desulfation. 4. The method of claim 3, wherein the desired catalyst lambda is approximately 0.9. 5. The method of claim 1, wherein the at least one characteristic of the exhaust flow is one of exhaust flow temperature, catalyst lambda, or exhaust flow rate. 6. The method of claim 1, further including maintaining a desired catalyst temperature prior to desulfation. 7. 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; holding the desired temperature substantially constant during desulfation; and modifying a flow rate of the reductant during desulfation to assist in holding the desired temperature substantially constant. 8. The method of claim 7, further including modifying a flow rate of the exhaust flow during desulfation to assist in holding the desired temperature substantially constant. 9. The method of claim 8, further including modifying the flow rate of the exhaust flow during desulfation in response to a sensed exhaust flow temperature. 10. The method of claim 9, wherein the sensed exhaust flow temperature corresponds to the desired temperature. 11. The method of claim 7, further including holding a catalyst lambda of the exhaust flow substantially constant during desulfation. 12. The method of claim 11, further including modifying at least one of a flow rate of the exhaust flow and the flow rate of the reductant, during desulfation, to assist in holding the catalyst lambda substantially constant. 13. The method of claim 12, further including modifying at least one of the flow rate of the exhaust flow and the flow rate of the reductant in response to a sensed characteristic of the exhaust flow. 14. The method of claim 7, wherein the desired temperature is in the range of approximately 500° C. to approximately 800° C. 15. The method of claim 7, further including heating an oxidation catalyst to a desired temperature prior to desulfation. 16. 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 and a nozzle configured to inject reductant into the exhaust flow, the valving mechanism modifying a flow rate of the portion and the nozzle modifying a reductant flow rate, during desulfation, in response to a sensed temperature, such that a desired desulfation temperature is held substantially constant. 17. The system of claim 16, further including a controller in communication with the valving mechanism of each leg and configured to control the valving mechanisms. 18. The system of claim 16, wherein each of the legs further includes an oxygen bleeding assembly upstream of a NOx absorber. 19. The system of claim 18, wherein the oxygen bleeding assembly includes the nozzle and an oxidation catalyst. 20. The system of claim 18, wherein the oxygen bleeding assembly includes the nozzle and an ignition source. 21. The system of claim 18, wherein each of the legs further includes at least one sensor configured to sense at least one of NOx, lambda, temperature, or flow rate. 22. The system of claim 18, wherein the sensed temperature is a temperature of the portion. 23. The method of claim 1, further includes controllably cooling a NOx absorber of the desulfation leg after desulfation. 24. The method of claim 23, wherein controllably cooling the NOx absorber includes stopping the injection of reductant into the exhaust flow and restricting the flow rate of the exhaust flow through the desulfation leg. 25. The method of claim 23, wherein controllably cooling the NOx absorber includes controlling a rate at which oxygen is permitted to contact the NOx absorber. 26. The method of claim 23, wherein controllably cooling the NOx absorber includes controlling a rate at which reductant particles remaining on the NOx absorber are burned following desulfation. 27. The method of claim 23, wherein controllably cooling the NOx absorber includes: substantially prohibiting exhaust flow from passing through the desulfation leg for a predetermined period of time; and ramping up the flow rate of the exhaust flow through the desulfation leg. 28. The method of claim 1, wherein the flow rate of the exhaust flow is modified to cool the desulfation leg to hold the desired desulfation temperature substantially constant. 29. The method of claim 7, wherein the holding of the desired temperature substantially constant during desulfation includes cooling the desulfation leg. 30. The method of claim 7, further including: sensing at least one characteristic of at least one of an engine and the engine filter system; and determining whether to initiate desulfation based on the at least one sensed characteristic of the at least one of the engine and the engine filter system. 31. The method of claim 7, wherein the holding of the desired temperature substantially constant during desulfation includes modifying an engine-out lambda to assist in holding the desired temperature substantially constant. 32. The system of claim 16, wherein the valving mechanism is configured to modify the flow rate of the portion of the exhaust flow, during desulfation, in response to the sensed temperature, to cool the at least one leg such that the desired desulfation temperature is held substantially constant. 33. The system of claim 16, further including: a sensor configured to sense at least one characteristic of at least one of an engine connected to the filter system and the filter system; and a controller configured to initiate desulfation based on the at least one sensed characteristic of the at least one of the engine and the filter system.
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