发明授权
- 专利标题: Exhaust purifying method and apparatus of an internal combustion engine
- 专利标题(中): 内燃机的排气净化方法和装置
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申请号: US09817172申请日: 2001-03-27
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公开(公告)号: US06594991B2公开(公告)日: 2003-07-22
- 发明人: Kazuhiro Itoh , Toshiaki Tanaka , Shinya Hirota , Takamitsu Asanuma , Koichi Kimura , Koichiro Nakatani
- 申请人: Kazuhiro Itoh , Toshiaki Tanaka , Shinya Hirota , Takamitsu Asanuma , Koichi Kimura , Koichiro Nakatani
- 优先权: JP2000-090755 20000327; JP2000-093024 20000328; JP2000-092532 20000329; JP2000-343813 20001110
- 主分类号: F01N300
- IPC分类号: F01N300
摘要:
An exhaust purifying method and apparatus of an internal combustion engine are provided with an exhaust switch valve for switching a flow of exhaust gas flowing into an exhaust filter. By switching the exhaust switch valve, the exhaust gas is fed from one side and the other side of the filter, thereby stirring the soot (particulates) in the exhaust gas deposited on the filter having a NOx absorbent and an active-oxygen discharging agent supported thereon. Thus, the soot in the exhaust gas is continuously burned. Moreover, the switching of the exhaust switch valve and the rich spike are inhibited from being conducted simultaneously. In the case where the rich spike is conducted in order to discharge and reduce NOx absorbed in the NOx absorbent, the exhaust gas containing a large amount of HC and CO can be prevented from being discharged into the atmosphere without being purified.