- 专利标题： Exhaust gas purification system for an internal combustion engine
- 专利标题（中）： 内燃机废气净化系统
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申请号： US12677249申请日： 2009-03-31
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公开(公告)号： US08650863B2公开(公告)日： 2014-02-18
- 发明人: Yuichi Sobue , Kohei Yoshida , Hiroshi Otsuki , Masahide Iida , Itsuya Kurisaka , Ko Sugawara
- 申请人： Yuichi Sobue , Kohei Yoshida , Hiroshi Otsuki , Masahide Iida , Itsuya Kurisaka , Ko Sugawara
- 申请人地址： JP Toyota
- 专利权人： Toyota Jidosha Kabushiki Kaisha
- 当前专利权人： Toyota Jidosha Kabushiki Kaisha
- 当前专利权人地址： JP Toyota
- 代理机构： Oliff, PLC
- 国际申请： PCT/JP2009/056694 WO 20090331
- 国际公布： WO2010/113278 WO 20101007
- 主分类号： F01N3/00
- IPC分类号： F01N3/00
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.
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