发明名称 |
Catalyst degradation determining method |
摘要 |
A catalyst degradation determining method includes the steps of: controlling an upstream-of-catalyst air-fuel ratio occurring upstream of a first catalyst to an air-fuel ratio that is rich of a stoichiometric air-fuel ratio so that first and second catalysts store oxygen up to a maximum storage amount of oxygen. The method then includes the steps of controlling the upstream-of-catalyst air-fuel ratio to a first lean air-fuel ratio until an output of a downstream-of-first-catalyst sensor indicates a lean air-fuel ratio, and then to a second lean air-fuel ratio and that has a value that is determined in accordance with an oxidizing-reducing capability index value, until a time point when an output of a downstream-of-second-catalyst air-fuel ratio sensor indicates an air-fuel ratio that is lean. |
申请公布号 |
US2005217242(A1) |
申请公布日期 |
2005.10.06 |
申请号 |
US20050133205 |
申请日期 |
2005.05.20 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
KAMOTO AKIRA;NAGAI TOSHINARI;OI YASUHIRO;ADACHI NORIYASU;IDE KOJI;KOBAYASHI DAISUKE;OKAZAKI SHUNTARO;KATO NAOTO;UCHIDA TAKAHIRO |
分类号 |
F02D45/00;F01N3/00;F01N3/20;F01N3/24;F01N7/00;F01N11/00;F02D41/14;(IPC1-7):F01N3/00 |
主分类号 |
F02D45/00 |
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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