Method for regenerating NOx storage catalytic converters of diesel engines with low-pressure EGR
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01N-003/20
F01N-003/10
F01N-003/08
F02D-041/00
F02D-041/02
F02D-041/04
F02D-041/12
F02B-037/00
출원번호
US-0116754
(2012-05-09)
등록번호
US-9482128
(2016-11-01)
우선권정보
DE-10 2011 101 079 (2011-05-10)
국제출원번호
PCT/EP2012/058547
(2012-05-09)
§371/§102 date
20131202
(20131202)
국제공개번호
WO2012/152833
(2012-11-15)
발명자
/ 주소
Eckhoff, Stephan
Franoschek, Stefan
Adam, Frank
출원인 / 주소
UMICORE AG & CO. KG
대리인 / 주소
Smith, Gambrell & Russell, LLP
인용정보
피인용 횟수 :
0인용 특허 :
12
초록▼
The invention relates to a method for regenerating nitrogen oxide storage catalytic converters and to a correspondingly adapted exhaust-gas purification system for lean-burn engines. In particular, the present invention relates to the regeneration of nitrogen oxide storage catalytic converters durin
The invention relates to a method for regenerating nitrogen oxide storage catalytic converters and to a correspondingly adapted exhaust-gas purification system for lean-burn engines. In particular, the present invention relates to the regeneration of nitrogen oxide storage catalytic converters during special driving situations of the vehicle.
대표청구항▼
1. A method for regenerating a nitrogen oxide storage catalytic converter which is arranged in an exhaust line of a lean-burn engine, wherein the engine is provided with a low-pressure EGR valve in a low-pressure EGR line and a device for reducing exhaust-gas discharge and/or a device for reducing t
1. A method for regenerating a nitrogen oxide storage catalytic converter which is arranged in an exhaust line of a lean-burn engine, wherein the engine is provided with a low-pressure EGR valve in a low-pressure EGR line and a device for reducing exhaust-gas discharge and/or a device for reducing the intake air, comprising: performing an overrun operation of the engine, during which the engine does no positive work though continues turning over,commencing regeneration of the nitrogen oxide storage catalytic converter during the overrun operation, andduring regeneration of the nitrogen oxide storage catalytic converter, throttling the intake air by the device for reducing the intake air and/or reducing the discharge of the exhaust gases by the device for reducing exhaust-gas discharge, and conducting at least a portion of the exhaust gas in a circuit through the low-pressure EGR valve via the engine and the nitrogen oxide storage catalytic converter, whereinduring regeneration of the nitrogen oxide storage catalytic converter, an air-fuel mixture is set to a lambda value of ≦1. 2. The method as claimed in claim 1, wherein the engine is mounted in a vehicle, and performing the overrun operation of the engine comprises turning over the engine while the vehicle is driven under the action of the inertial or gravitational mass of the vehicle. 3. The method as claimed in claim 1, wherein the engine is mounted in a vehicle, and performing the overrun operation of the engine comprises turning over the engine while the vehicle is driven under the action of an electric motor. 4. The method as claimed in claim 1, further comprising shutting down the engine, and performing the overrun operation during the shut-down of the engine. 5. The method as claimed in claim 1, further comprising opening the low-pressure EGR valve, and performing the commenced regeneration while the low-pressure EGR valve is completely open. 6. The method as claimed in claim 1, wherein during the regeneration, maintaining an air-fuel mixture which corresponds to a lambda value of 0.8 to 1. 7. The method as claimed in claim 1, wherein the engine is mounted in a vehicle, and calculating the onset and the duration of the overrun operation of the engine, and the regeneration of the nitrogen oxide storage catalytic converter, based on surroundings data of the vehicle. 8. The method as claimed in claim 1, wherein performance of the commenced regeneration of the nitrogen oxide storage catalytic converter comprises reducing nitrogen oxides at temperatures of between 150° C. and 500° C. in the nitrogen oxide storage catalytic converter. 9. The method as claimed in claim 1, wherein performance of the commenced regeneration of the nitrogen oxide storage catalytic converter comprises reducing sulfur oxides at temperatures above 500° C. in the nitrogen oxide storage catalytic converter. 10. A method for regenerating a nitrogen oxide storage catalytic converter which is arranged in an exhaust line of a lean-burn engine, wherein the engine is provided with a low-pressure EGR valve in a low-pressure EGR line and an exhaust-gas discharge valve and/or an intake air valve, comprising: performing an overrun operation of the engine, during which the engine does no positive work though continues turning over,regenerating the nitrogen oxide storage catalytic converter during the overrun operation, andduring regeneration of the nitrogen oxide storage catalytic converter, throttling the intake air by the intake air valve and/or reducing the discharge of the exhaust gases by the exhaust-gas discharge valve, and conducting at least a portion of the exhaust gas in a circuit through the low-pressure EGR valve via the engine and the nitrogen oxide storage catalytic converter, whereinduring regeneration of the nitrogen oxide storage catalytic converter, an air-fuel mixture is set to a lambda value of ≦1. 11. The method as claimed in claim 10, wherein the engine is mounted in a vehicle, and performing the overrun operation of the engine comprises turning over the engine while the vehicle is driven under the action of the inertial or gravitational mass of the vehicle. 12. The method as claimed in claim 10, wherein the engine is mounted in a vehicle, and performing the overrun operation of the engine comprises turning over the engine while the vehicle is driven under the action of an electric motor. 13. The method as claimed in claim 10, further comprising shutting down the engine, and performing the overrun operation during the shut-down of the engine. 14. The method as claimed in claim 10, further comprising opening the low-pressure EGR valve, and performing the commenced regeneration while the low-pressure EGR valve is completely open. 15. The method as claimed in claim 10, wherein during the regeneration, maintaining an air-fuel mixture which corresponds to a lambda value of 0.8 to 1. 16. The method as claimed in claim 10, wherein the engine is mounted in a vehicle, and calculating the onset and the duration of the overrun operation of the engine, and the regeneration of the nitrogen oxide storage catalytic converter, based on surroundings data of the vehicle. 17. The method as claimed in claim 10, wherein performance of the commenced regeneration of the nitrogen oxide storage catalytic converter comprises reducing nitrogen oxides at temperatures of between 150° C. and 500° C. in the nitrogen oxide storage catalytic converter. 18. The method as claimed in claim 10, wherein performance of the commenced regeneration of the nitrogen oxide storage catalytic converter comprises reducing sulfur oxides at temperatures above 500° C. in the nitrogen oxide storage catalytic converter.
Vigild, Christian Winge; Kuenstler, Johannes; Roettger, Daniel; Karvounis, Evangelos, Control method for temporarily increasing the exhaust gas temperature.
Eckhoff, Stephan; Mueller, Wilfried; Richter, Joerg-Michael; Franoschek, Stefan; Votsmeier, Martin, Exhaust-gas aftertreatment system with catalytically active wall-flow filter with storage function upstream of catalytic converter with identical storage function.
Pfeifer,Markus; Van Setten,Barry; Spurk,Paul; Demel,Yvonne; Kuhl,Tobias; Gieshoff,J��rgen; Lox,Egbert; Kreuzer,Thomas, Method of removing nitrogen oxides from the exhaust gas of a lean-burn internal combustion engine and exhaust-gas purification system therefor.
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