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公开(公告)号:US07351677B2
公开(公告)日:2008-04-01
申请号:US10630303
申请日:2003-07-29
IPC分类号: B01J20/34
CPC分类号: F02D41/0275 , B01D53/9495 , B01D53/96 , F01N3/0885 , F01N2430/06 , F01N2560/026 , Y02T10/20
摘要: The present invention provides a process and a device for regeneration of a nitrogen oxide storage catalyst in the exhaust system of a diesel engine. The process comprises a first and a second regeneration strategy. The first regeneration strategy is applied when the exhaust gas temperature is above a threshold value and comprises changing the air/fuel-ratio from a lean to a rich value during a first regeneration period. The second regeneration strategy is applied when the exhaust gas temperature is below a threshold value and comprises switching the air/fuel-ratio back and forth between lean and rich air/fuel-ratios, forming a sequence of between 2 and 10 rich pulses and between 2 and 10 lean pulses during a second regeneration period.
摘要翻译: 本发明提供一种用于在柴油发动机的排气系统中再生氮氧化物存储催化剂的方法和装置。 该方法包括第一和第二再生策略。 当废气温度高于阈值时,应用第一再生策略,并且包括在第一再生期间将空气/燃料比从贫值改变为浓值。 当废气温度低于阈值时,应用第二再生策略,并且包括在稀空燃比之间来回切换空燃比,形成富二脉冲之间的序列,介于 在第二再生期间的2和10个贫脉冲。