Invention Grant
- Patent Title: Abnormality detection system and abnormality detection method for internal combustion engine
- Patent Title (中): 内燃机异常检测系统及异常检测方法
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Application No.: US12674445Application Date: 2008-12-04
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Publication No.: US08171723B2Publication Date: 2012-05-08
- Inventor: Taiga Hagimoto , Hiroshi Sawada , Daisuke Shibata
- Applicant: Taiga Hagimoto , Hiroshi Sawada , Daisuke Shibata
- Applicant Address: JP Toyota-shi
- Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee Address: JP Toyota-shi
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2007-315899 20071206
- International Application: PCT/IB2008/003681 WO 20081204
- International Announcement: WO2009/071994 WO 20090611
- Main IPC: F01N11/00
- IPC: F01N11/00 ; F01N3/20
Abstract:
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.
Public/Granted literature
- US20110146235A1 ABNORMALITY DETECTION SYSTEM AND ABNORMALITY DETECTION METHOD FOR INTERNAL COMBUSTION ENGINE Public/Granted day:2011-06-23
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