发明名称 |
An exhaust gas purification device for an internal combustion engine |
摘要 |
<p>In an exhaust gas purification device for an internal combustion engine, a three-way catalyst and a NOX 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 NOX 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. <IMAGE></p> |
申请公布号 |
EP0903478(A2) |
申请公布日期 |
1999.03.24 |
申请号 |
EP19980117676 |
申请日期 |
1998.09.17 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
SAWADA, HIROSHI;KAKO, JUNICHI |
分类号 |
F01N3/08;B01D53/94;F01N3/20;F01N3/24;F01N11/00;F01N13/02;F01N13/04;F02D41/02;F02D41/14;(IPC1-7):F01N3/08 |
主分类号 |
F01N3/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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