发明授权
- 专利标题： Catalyst deterioration detecting apparatus and method
- 专利标题（中）： 催化剂劣化检测装置及方法
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申请号： US10193900申请日： 2002-07-15
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公开(公告)号： US07198952B2公开(公告)日： 2007-04-03
- 发明人: Takahiro Uchida , Hiroshi Sawada , Toshinari Nagai , Akihiro Katayama , Yasuhiro Kuze , Naoto Kato
- 申请人： Takahiro Uchida , Hiroshi Sawada , Toshinari Nagai , Akihiro Katayama , Yasuhiro Kuze , Naoto Kato
- 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 & Berridge, PLC
- 优先权： JP2001-218661 20010718; JP2001-285885 20010919
- 主分类号： G01N31/10
- IPC分类号： G01N31/10 ; G01N33/22 ; F01N3/18 ; F01N3/20 ; F01N3/22
摘要：
An upstream side catalyst and a downstream side catalyst are disposed in an exhaust passage. A first oxygen sensor is disposed between these two catalysts and a second oxygen sensor is disposed downstream of the downstream side catalyst. The air-fuel ratio is forcibly oscillated and the oxygen storage capacity of the upstream side catalyst is detected. Deterioration of the upstream side catalyst is then detected based on whether this oxygen storage capacity is larger than a predetermined value. The forced oscillation of the air-fuel ratio is performed only when the oxygen storage state of the downstream side catalyst is appropriate.
公开/授权文献
- US20030017603A1 Catalyst deterioration detecting apparatus and method 公开/授权日：2003-01-23
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