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    • 2. 发明公开
    • 질소 산화물 저장 촉매의 재생방법
    • 用于再生氮氧化物储存催化剂的方法
    • KR1020040012561A
    • 2004-02-11
    • KR1020030052995
    • 2003-07-31
    • 우미코레 아게 운트 코 카게
    • 로르프리데만카트빙켈페터페터슈테판디트리히크로이처토마스록스에크베르트
    • B01J38/00B01D53/94F01N3/18
    • F02D41/0275B01D53/9495B01D53/96F01N3/0885F01N2430/06F01N2560/026Y02T10/20
    • PURPOSE: A process and a device for regeneration of a nitrogen oxide storage catalyst in the exhaust system of a diesel engine are provided. CONSTITUTION: The process for regeneration of a nitrogen oxide storage catalyst comprises (a) applying a first regeneration strategy when the exhaust gas temperature is above a threshold temperature, wherein the first regeneration strategy comprises changing a lean air/fuel-ratio to a rich air/fuel-ratio during a first regeneration period; and (b) applying a second regeneration strategy when the exhaust gas temperature is below the threshold temperature, wherein the second regeneration strategy comprises switching the air/fuel-ratio between a lean air/fuel-ratio and a rich air/fuel-ratio back and forth forming a sequence of rich pulses and lean pulses, and the sequence has between 2 and 10 rich pulses and between 2 and 10 lean pulses during a second regeneration period. The device for regeneration of a nitrogen oxide storage catalyst comprises (a) a means for applying a first regeneration strategy when the exhaust gas temperature is above a threshold value, the first regeneration strategy comprising changing the air/fuel-ratio from a lean air/fuel-ratio to a rich air/fuel-ratio value during a first regeneration period; and (b) a means for applying a second regeneration strategy when the exhaust gas temperature is below the threshold value, the second regeneration strategy comprising a means for switching the air/fuel-ratio between a lean air/fuel-ratio and a rich air/fuel-ratio back and forth forming a sequence of rich pulses and lean-pulses with between 2 and 10 rich pulses and between 2 and 10 lean pulses during a second regeneration period.
    • 目的:提供一种在柴油发动机的排气系统中再生氮氧化物储存催化剂的方法和装置。 构成:氮氧化物存储催化剂的再生方法包括(a)当排气温度高于阈值温度时施加第一再生策略,其中第一再生策略包括将稀空气/燃料比改为浓空气 /燃料比; 和(b)当废气温度低于阈值温度时施加第二再生策略,其中第二再生策略包括在稀空气/燃料比和富空燃比之间切换空气/燃料比 并且形成富脉冲和贫脉冲的序列,并且该序列在第二再生期间具有2至10个富脉冲和2至10个贫脉冲之间。 氮氧化物储存催化剂的再生装置包括:(a)当废气温度高于阈值时施加第一再生策略的装置,所述第一再生策略包括从空气/ 在第一再生期间的燃料比与浓空气/燃料比值的关系; 和(b)当废气温度低于阈值时施加第二再生策略的装置,所述第二再生策略包括用于切换稀空燃比与富空气之间的空气/燃料比的装置 /燃料比在第二再生时段期间来回形成富脉冲和贫脉冲序列,其具有2至10个富脉冲和2至10个贫脉冲。