Invention Grant
- Patent Title: Exhaust purification method and exhaust purification apparatus of internal combustion engine
- Patent Title (中): 内燃机排气净化方法及排气净化装置
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Application No.: US10544795Application Date: 2004-02-12
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Publication No.: US07520126B2Publication Date: 2009-04-21
- Inventor: Shinicihi Takeshima , Toshiaki Tanaka , Tetsuya Yamashita
- Applicant: Shinicihi Takeshima , Toshiaki Tanaka , Tetsuya Yamashita
- Applicant Address: JP Toyota
- Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee Address: JP Toyota
- Agency: Oliff & Berridge, PLC
- Priority: JP2003-041031 20030219
- International Application: PCT/JP2004/001493 WO 20040212
- International Announcement: WO2004/074650 WO 20040209
- Main IPC: F01N3/10
- IPC: F01N3/10

Abstract:
In an internal combustion engine, an exhaust passage is provided with a NOx storing and decomposing catalyst (20). When burning fuel under a lean air-fuel ratio, the nitrogen monoxide is adsorbed by the NOx storing and decomposing catalyst (20) and disassociated. At this time, the disassociated oxygen is held in the form of oxygen ions O− on the NOx storing and decomposing catalyst (20). By making the air-fuel ratio rich and purging part of these oxygen ions O−, the remaining oxygen ions O− are also purged. Due to this, the NOx purification performance of the NOx storing and decomposing catalyst (20) is restored.
Public/Granted literature
- US20060137328A1 EXHAUST PURIFICATION METHOD AND EXHAUST PURIFICATION APPARATUS OF INTERNAL COMBUSTION ENGINE Public/Granted day:2006-06-29
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