IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0081893
(2008-04-23)
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등록번호 |
US-7832200
(2011-01-16)
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발명자
/ 주소 |
- Kesse, Mary Lou
- Wynkoop, Chris L.
- Wei, Zhiyong
- Lukich, Michael S.
- Scrivner, Wade D.
- Jayachandran, Amit
|
출원인 / 주소 |
|
대리인 / 주소 |
Finnegan, Henderson, Farabow, Garrett & Dunbar LLC
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인용정보 |
피인용 횟수 :
29 인용 특허 :
20 |
초록
▼
An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passageway, and a reduction catalyst disposed within the exhaust passageway. The exhaust system may also have a first sensor located to generate a first signal indicative of an operational paramet
An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passageway, and a reduction catalyst disposed within the exhaust passageway. The exhaust system may also have a first sensor located to generate a first signal indicative of an operational parameter of the reduction catalyst, and a second sensor located to generate a second signal indicative of a performance parameter of the reduction catalyst. The exhaust system may further have an injection device located to inject reductant upstream of the reduction catalyst, and a controller in communication with the combustion engine, the first sensor, the second sensor, and the injection device. The controller may be configured to determine a NOX production of the combustion engine, determine an amount of reductant that should be injected based on the NOX production and the first signal, and adjust the amount based on the second signal.
대표청구항
▼
What is claimed is: 1. An exhaust system for a combustion engine, comprising: an exhaust passageway; a reduction catalyst disposed within the exhaust passageway; an injection device located to inject reductant into the exhaust passageway upstream of the reduction catalyst; a particulate filter loca
What is claimed is: 1. An exhaust system for a combustion engine, comprising: an exhaust passageway; a reduction catalyst disposed within the exhaust passageway; an injection device located to inject reductant into the exhaust passageway upstream of the reduction catalyst; a particulate filter located upstream of the reduction catalyst; a soot sensor configured to determine an amount of soot loading in the particulate filter; and a controller in communication with the soot sensor and the injection device, the controller being configured to: determine an amount of reductant that should be injected at least partially based on the soot loading in the particulate filter. 2. The exhaust system of claim 1, wherein the particulate filter includes an oxidation catalyst. 3. The exhaust system of claim 1, further including an ammonia oxidation catalyst located downstream of the reduction catalyst. 4. The exhaust system of claim 1, wherein the particulate filter converts a first exhaust constituent to a second exhaust constituent in preparation for reduction of at least one of the first and the second exhaust constituents by the reduction catalyst. 5. The exhaust system of claim 1, wherein the soot sensor is at least one of a pressure sensor, a pair of pressure sensors, a temperature sensor, a model driven virtual sensor, or an RF sensor. 6. The exhaust system of claim 1, further including: a first sensor located to generate a first signal indicative of an operational parameter of the reduction catalyst; and a second sensor located downstream of the reduction catalyst to generate a second signal indicative of a performance parameter of the reduction catalyst; wherein the controller is in communication with the first sensor and the second sensor, the controller being configured to: determine a NOX production of the combustion engine; determine the amount of reductant that should be injected based further on the NOX production and the first signal. 7. The exhaust system of claim 6, wherein the operational parameter is at least one of a temperature of the reduction catalyst and a flow rate of exhaust passing through the reduction catalyst. 8. The exhaust system of claim 6, wherein the performance parameter is at least one of an amount of NOX and an amount of NH3 detected within the exhaust flow. 9. The exhaust system of claim 6, wherein the controller is further configured to: determine residual NOX within the exhaust downstream of the reduction catalyst based on the second signal; determine an operational adjustment of the combustion engine that changes the production of NOX; determine an effect the operational adjustment of the combustion engine will have on at least one of efficiency and responsiveness of the combustion engine; and selectively implement the operational adjustment of the combustion engine based on the determined effect. 10. The exhaust system of claim 1, wherein the controller is further configured to determine an operational parameter of the injection device, and to determine the amount of reductant that should be injected based further on the operational parameter of the injection device. 11. The exhaust system of claim 10, wherein the operational parameter of the injection device is an amount of reductant available for injection. 12. A method of operating a combustion engine, comprising: directing a flow of exhaust from the combustion engine through a reduction catalyst; collecting particulate matter from the exhaust flow upstream of the reduction catalyst; determining an amount of particulate matter build up upstream of the reduction catalyst; determining an amount of reductant that should be injected into the exhaust flow upstream of the reduction catalyst based at least partially on the amount of particulate matter build up; and injecting the determined amount of reductant. 13. The method of claim 12, further including converting a first exhaust constituent to a second exhaust constituent in preparation for reduction of both the first and the second exhaust constituents by the reduction catalyst and the amount of particulate matter build up effects the converting of the first exhaust constituent to the second exhaust constituent. 14. The method of claim 12, wherein the amount of particulate matter build up is determined by a soot sensor and wherein the soot sensor is at least one of a pressure sensor, a pair of pressure sensors, a temperature sensor, a model driven virtual sensor, or an RF sensor. 15. The method of claim 12, further including: sensing an operational parameter of the reduction catalyst; sensing a performance parameter of the reduction catalyst; determining a NOX production of the combustion engine; determining the amount of reductant that should be injected into the exhaust flow upstream of the reduction catalyst based on the NOX production and the sensed operational parameter; wherein the amount of reductant that should be injected is determined based further on the sensed performance parameter. 16. The method of claim 15, wherein the performance parameter is at least one of an amount of NOX and an amount of NH3 detected within the flow of exhaust and the operational parameter is at least one of a temperature of the reduction catalyst and a flow rate of exhaust passing through the reduction catalyst. 17. The method of claim 15, wherein: sensing a performance parameter of the reduction catalyst includes determining an excessive amount of NOX remaining within the exhaust downstream of the reduction catalyst; and the method further includes: determining an operational adjustment of the combustion engine that reduces the production of NOX; determining an effect the operational adjustment of the combustion engine will have on at least one of efficiency and responsiveness of the combustion engine; and selectively implementing the operational adjustment of the combustion engine based on the determined effect. 18. The method of claim 12, wherein the particulate matter is built up in a particulate filter and the amount of particulate matter build up is determined by a soot sensor associated with the particulate filter. 19. The method of claim 18, wherein the particulate filter is configured to convert Nitrogen Monoxide (NO) into Nitrogen Dioxide (NO2). 20. A power system, comprising: an engine configured to combust fuel and generate a flow of exhaust; an exhaust passageway leading from the engine to the atmosphere; an SCR catalyst disposed within the exhaust passageway; an injection device located to inject urea into the exhaust passageway upstream of the SCR catalyst; a particulate filter located upstream of the injection device; a soot sensor configured to determine an amount of soot loading in the particulate filter; and a controller in communication with the engine, the soot sensor, and the injection device, the controller being configured to: determine an amount of urea that should be injected based at least partially on the soot loading in the particulate filter.
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