IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0982921
(2004-11-08)
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등록번호 |
US-7552583
(2009-07-09)
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발명자
/ 주소 |
- Robel, Wade J.
- Driscoll, James J.
- Coleman, Gerald N.
- Knox, Kevin J.
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출원인 / 주소 |
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대리인 / 주소 |
Finnegan, Henderson, Farabow, Garrett & Dunner
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인용정보 |
피인용 횟수 :
2 인용 특허 :
22 |
초록
▼
A power source is provided for use with selective catalytic reduction systems for exhaust-gas purification. The power source includes a first cylinder group with a first air-intake passage and a first exhaust passage, and a second cylinder group with a second air-intake passage and a second exhaust
A power source is provided for use with selective catalytic reduction systems for exhaust-gas purification. The power source includes a first cylinder group with a first air-intake passage and a first exhaust passage, and a second cylinder group with a second air-intake passage and a second exhaust passage. The second air-intake passage is fluidly isolated from the first air-intake passage. A fuel-supply device may be configured to supply fuel into the first exhaust passage, and a catalyst may be disposed downstream of the fuel-supply device to convert at least a portion of the exhaust stream in the first exhaust passage into ammonia.
대표청구항
▼
What is claimed is: 1. A power source for use with selective catalytic reduction systems for exhaust-gas purification, comprising: a first cylinder group with a first air-intake passage and a first exhaust passage; a second cylinder group with a second air-intake passage and a second exhaust passag
What is claimed is: 1. A power source for use with selective catalytic reduction systems for exhaust-gas purification, comprising: a first cylinder group with a first air-intake passage and a first exhaust passage; a second cylinder group with a second air-intake passage and a second exhaust passage, wherein a length of the second air-intake passage which begins at atmosphere is fluidly isolated from a length of the first air-intake passage which begins at atmosphere and extends to a cylinder in the first cylinder group; a catalyst to convert at least a portion of the exhaust stream in the first exhaust passage into ammonia; a first system configured to control air flow into the first air-intake passage; and a second system configured to control air flow into the second air-intake passage, the second system configured to operate independently of the first system. 2. The power source of claim 1, wherein at least one of the first and second air-intake passages includes a forced-induction system. 3. The power source of claim 2, wherein the forced-induction system includes a turbocharger or supercharger. 4. The power source of claim 1, wherein the second exhaust passage includes an oxidation catalyst. 5. A machine including the power source of claim 1. 6. The power source of claim 1, further including a fuel-supply device configured to supply fuel into the first exhaust passage. 7. The power source of claim 6, wherein an exhaust stream in the first exhaust passage is lean upstream from the fuel-supply device. 8. The power source of claim 7, wherein the exhaust stream in the first exhaust passage is rich downstream from the fuel-supply device. 9. The power source of claim 6, wherein the first exhaust passage and the second exhaust passage are fluidly connected downstream from the fuel-supply device to form a merged exhaust passage. 10. The power source of claim 9, further including a catalyst disposed in the merged exhaust passage and configured to facilitate a reaction between ammonia and NOx to at least partially remove NOx from the merged exhaust passage. 11. The power source of claim 1, wherein the length of the second air-intake passage extends to a cylinder in the second cylinder group. 12. The power source of claim 1, further including a first forced-induction system configured to force air through the first air-intake passage, and a second forced-induction system configured to force air through the second air-intake passage. 13. The power source of claim 1, wherein an entire length of the second air-intake passage is fluidly isolated from an entire length of the first air-intake passage. 14. A power source for use with selective catalytic reduction systems for exhaust-gas purification, comprising: a first cylinder group including: one or more cylinders; a first air-intake passage fluidly communicating with the one or more cylinders of the first cylinder group; and a first exhaust passage fluidly communicating with the one or more cylinders of the first cylinder group; a second cylinder group including: at least two cylinders, wherein a single cylinder of the second cylinder group and a single cylinder of the first cylinder group have a matched stroke-cycle, and all other cylinders from the second cylinder group have unique stroke cycles, a second air-intake passage fluidly communicating with the at least two cylinders of the second cylinder group, wherein the second air-intake passage, which begins at atmosphere and extends to the cylinders of the second cylinder group, is fluidly isolated from the first air-intake passage, which begins at atmosphere and extends to the one or more cylinders of the first cylinder group; and a second exhaust passage fluidly communicating with the at least two cylinders of the second cylinder group; a catalyst to convert at least a portion of the exhaust in the first exhaust passage into ammonia; a first system configured to control air flow into the first air-intake passage; and a second system configured to control air flow into the second air-intake passage, the second system configured to operate independently of the first system. 15. The power source of claim 14, wherein the at least a portion of the exhaust in the first exhaust passage includes NOx. 16. The power source of claim 14, wherein the first cylinder group includes only one cylinder and the second cylinder group includes five cylinders. 17. The power source of claim 14, wherein a power output from the single cylinder of the first cylinder group, having the matched stroke cycle with a cylinder from the second cylinder group, is less than a power output from each of the remaining cylinders of the second cylinder group. 18. The power source of claim 14, wherein a combined power output from the matched cylinders of the first and second cylinder groups is approximately equal to a power output of each of the remaining cylinders from the second cylinder group. 19. The power source of claim 14, wherein at least one of the first and second air-intake passages includes a forced-induction system. 20. The power source of claim 14, wherein the second exhaust passage includes an oxidation catalyst. 21. A machine including the power source of claim 14. 22. he power source of claim 14, further including a fuel-supply device configured to supply fuel into the first exhaust passage. 23. The power source of claim 22, wherein an exhaust stream in the first exhaust passage is lean upstream from the fuel-supply device. 24. The power source of claim 23, wherein the exhaust stream in the first exhaust passage is rich downstream from the fuel-supply device. 25. The power source of claim 22, wherein the first exhaust passage and the second exhaust passage are fluidly connected downstream of the fuel-supply device to form a merged exhaust passage. 26. The power source of claim 25, further including a catalyst disposed in the merged exhaust passage and configured to facilitate a reaction between ammonia and NOx to at least partially remove NOx from the merged exhaust passage. 27. A method of operating a power source for use with selective catalytic reduction systems for exhaust-gas purification, comprising: supplying air through a first air-intake passage, which begins at atmosphere, to a first cylinder group including one or more cylinders; supplying a first exhaust stream to a first exhaust passage in fluid communication with the one or more cylinders of the first cylinder group; supplying air through a second air-intake passage, which begins at atmosphere, to a second cylinder group including at least two cylinders, wherein the first air-intake passage is fluidly isolated along its entire length from the second air-intake passage, the first cylinder group and second cylinder group are operably connected to a single drive shaft, and the air is supplied through the second air-intake passage independently of the air supplied through the first air-intake passage; supplying a second exhaust stream to a second exhaust passage in fluid communication with the at least two cylinders of the second cylinder group; and converting at least a portion of the first exhaust stream to ammonia. 28. The method of claim 27, wherein the at least a portion of the first exhaust stream includes NOx. 29. The method of claim 27, further including matching a stroke cycle of a single cylinder from the first cylinder group with a stroke cycle of a single cylinder from the second cylinder group and maintaining unique stroke cycles for all other cylinders from the second cylinder group. 30. The method of claim 27, further including supplying air to at least one of the first and second air-intake passages through a forced-induction system. 31. The method of claim 27, further including merging the exhaust stream of the first exhaust passage with the exhaust stream of the second exhaust passage to form a merged exhaust stream. 32. The method of claim 31, further including using an oxidation catalyst to control a ratio of NO to NO2 in the merged exhaust stream. 33. The method of claim 31, further including: exposing the merged exhaust stream to a catalyst configured to facilitate a reaction between ammonia and NOx; and at least partially removing NOx from the merged exhaust stream. 34. The method of claim 27, further including supplying fuel to the first exhaust stream from a fuel-supply device operably connected to the first exhaust passage. 35. The method of claim 34, further including operating the one or more cylinders of the first group such that the first exhaust stream is lean upstream of the fuel-supply device. 36. The method of claim 35, further including using the fuel-supply device to make the first exhaust stream rich downstream of the fuel-supply device.
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