发明授权
- 专利标题： Abnormality detection system and abnormality detection method for internal combustion engine
- 专利标题（中）： 内燃机异常检测系统及异常检测方法
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申请号： US12674445申请日： 2008-12-04
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公开(公告)号： US08171723B2公开(公告)日： 2012-05-08
- 发明人: Taiga Hagimoto , Hiroshi Sawada , Daisuke Shibata
- 申请人： Taiga Hagimoto , Hiroshi Sawada , Daisuke Shibata
- 申请人地址： JP Toyota-shi
- 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-shi
- 代理机构： Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权： JP2007-315899 20071206
- 国际申请： PCT/IB2008/003681 WO 20081204
- 国际公布： WO2009/071994 WO 20090611
- 主分类号： F01N11/00
- IPC分类号： F01N11/00 ; F01N3/20
摘要：
When the NOx SCR catalyst (15) deteriorates, the NOx removal efficiency increases with an increase in the catalyst temperature as indicated by the curves B1 and B2. When there is an irregularity in the amount or quality of aqueous urea solution that is supplied to the NOx SCR catalyst, the NOx removal efficiency decreases at a constant rate as indicated by the curve C. When the NOx removal efficiency is first within the region X2 and then brought into the region Y1, it is determined that the NOx SCR catalyst deteriorates. When the NOx removal efficiency is first within the region X2 and then brought into the region Y2, it is determined that there is an irregularity in the amount or quality of the aqueous urea solution that is supplied to the NOx SCR catalyst.
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