- 专利标题: Exhaust gas purification apparatus for internal combustion engine
- 专利标题(中): 内燃机废气净化装置
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申请号: US12087509申请日: 2007-09-06
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公开(公告)号: US09199197B2公开(公告)日: 2015-12-01
- 发明人: Kohei Yoshida , Yasuaki Nakano , Tadashi Watanabe , Kotaro Hayashi , Takamitsu Asanuma
- 申请人: Kohei Yoshida , Yasuaki Nakano , Tadashi Watanabe , Kotaro Hayashi , Takamitsu Asanuma
- 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
- 优先权: JP2006-241365 20060906
- 国际申请: PCT/IB2007/002571 WO 20070906
- 国际公布: WO2008/029263 WO 20080313
- 主分类号: F01N3/28
- IPC分类号: F01N3/28 ; B01D53/94 ; F01N3/08 ; F01N13/00
摘要:
A fuel addition valve that adds fuel into the exhaust gas passage of the engine in the form of fine fuel droplets, an upstream NOx adsorption-reduction catalyst, and a downstream NOx adsorption-reduction catalyst are arranged in this order. Platinum Pt and palladium Pd, as noble metal, are supported on the downstream NOx adsorption-reduction NOx catalyst such that the ratio of the mole number of the platinum Pt to the sum of the mole numbers of the platinum Pt and the palladium Pd is approx. 50% to approx. 80%. Only platinum Pt is supported on the upstream NOx adsorption-reduction catalyst. According to this structure, even when liquid fuel is supplied into exhaust gas, NOx can be effectively released from the NOx adsorption-reduction catalyst, and further the amount of NOx that the NOx adsorption-reduction catalyst can adsorb at a low temperature increases.