公开(公告)号：US20120144807A1

公开(公告)日：2012-06-14

申请号：US12677249

申请日：2009-03-31

申请人： Yuichi Sobue ,  Kohei Yoshida ,  Hiroshi Otsuki ,  Masahide IIda ,  Itsuya Kurisaka ,  Ko Sugawara

发明人： Yuichi Sobue ,  Kohei Yoshida ,  Hiroshi Otsuki ,  Masahide IIda ,  Itsuya Kurisaka ,  Ko Sugawara

IPC分类号： F01N3/18

CPC分类号： F01N3/0814 ,  F01N3/0842 ,  F01N3/085 ,  F01N3/0885 ,  F01N2570/04 ,  F01N2900/1612 ,  F02D41/028 ,  F02D41/1446 ,  F02D2200/0818

摘要： The present invention is intended to improve a SOx reduction rate which is a ratio of an amount of SOx reduction with respect to an amount of SOx occlusion in SOx poisoning recovery processing. In the present invention, in the SOx poisoning recovery processing in which the SOx occluded in an NOx storage reduction catalyst is reduced by decreasing the air fuel ratio of an exhaust gas flowing into the NOx storage reduction catalyst to a predetermined air fuel ratio in a repeated manner, the length of a period in which the air fuel ratio of an exhaust gas flowing into the NOx storage reduction catalyst is decreased is made longer in a relatively early time during the processing than in a relatively late time during the processing.

摘要翻译： 本发明旨在提高SOx还原速率，SOx还原速率是SOx中毒恢复处理中SO x还原量相对于SOx吸收量的比例。 在本发明中，在通过将流入NOx吸留还原催化剂的废气的空燃比减少到规定的空燃比来减少NOx吸留还原催化剂中的SO x的SOx中毒恢复处理中， 在处理期间相对较早的时间内，流入NOx储存还原催化剂的排气的空燃比减少的时间段的长度比处理期间相对较晚的时间长。