发明授权
- 专利标题: Exhaust gas purification device for an internal combustion engine
- 专利标题(中): 内燃机用废气净化装置
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申请号: US150266申请日: 1998-09-09
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公开(公告)号: US5970707A公开(公告)日: 1999-10-26
- 发明人: Hiroshi Sawada , Junichi Kako
- 申请人: Hiroshi Sawada , Junichi Kako
- 申请人地址: JPX Aichi-Ken
- 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: JPX Aichi-Ken
- 优先权: JPX9-255252 19970919
- 主分类号: F01N3/08
- IPC分类号: F01N3/08 ; B01D53/94 ; F01N3/20 ; F01N3/24 ; F01N11/00 ; F01N13/02 ; F01N13/04 ; F02D41/02 ; F02D41/14 ; F01N3/00
摘要:
In an exhaust gas purification device for an internal combustion engine, a three-way catalyst and a NO.sub.X occluding and reducing catalyst (a NORC) are disposed in the exhaust gas passage of an engine in this order from the upstream side. A first air-fuel ratio sensor is disposed in the exhaust gas passage between the three-way catalyst and the NORC, and a second air-fuel ratio sensor is disposed in the exhaust gas passage downstream of the NORC. An engine electronic control unit (ECU) changes the operating air-fuel ratio of the engine from a lean air-fuel ratio to a rich air-fuel ratio and a rich air-fuel ratio to a lean air-fuel ratio in order to evaluate the abilities of the three-way catalyst and the NORC. The ECU evaluates the catalytic abilities based on the output of the first air-fuel ratio sensor when the engine air-fuel ratio is changed. Further, the ECU evaluates the catalytic ability and the NO.sub.X absorbing capacity of the NORC based on the outputs of the first and the second air-fuel ratio sensor when the engine operating air-fuel ratio is changed. The evaluation of the abilities of both the three-way catalyst and the NORC in one successive changing operation of the engine operating air-fuel ratio is based on only the outputs of the first and the second air-fuel ratio sensor.
公开/授权文献
- US4253563A Multistrand suture package 公开/授权日:1981-03-03