发明名称 |
Apparatus and method for determining catalyst degradation |
摘要 |
A target air-fuel ratio of exhaust gas is changed back and forth between rich and lean in short periods, and it is determined that the catalyst is degraded when the air-fuel ratio of exhaust gas is lean by the time a predetermined period of time has passed from the time the target air-fuel ratio started to be changed. |
申请公布号 |
US8074441(B2) |
申请公布日期 |
2011.12.13 |
申请号 |
US20060432404 |
申请日期 |
2006.05.12 |
申请人 |
FUJIWARA TAKAHIKO;TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
FUJIWARA TAKAHIKO |
分类号 |
F01N3/00;F01N3/20;F02D41/04;F02D41/22;F02D45/00 |
主分类号 |
F01N3/00 |
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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