发明名称 |
CATALYST-DEGRADATION DETECTION DEVICE |
摘要 |
An oxygen amount (an oxygen storage amount OSA) stored by metal cerium during a storage cycle is obtained basis on an output value of an A/F sensor 18 in a time period immediately before an exhaust air-fuel ratio (a downstream side A/F) detected by the A/F sensor 18 shifts to a lean region, and degradation relating to OSC of the three-way catalyst is detected. In the storage cycle, a target air-fuel ratio is set so that an air-fuel ratio of exhaust emission flowing into an S/C 14 changes from rich to lean. Therefore, the downstream side A/F shifts from stoichiometry to the lean region at a time t 1 after reaching stoichiometry. When the three-way catalyst degrades, the downstream side A/F shifts to the lean region from stoichiometry at a time t 4 . Therefore, the calculated oxygen storage amount OSA becomes extremely smaller as compared with that at a normal time. |
申请公布号 |
EP2772636(B1) |
申请公布日期 |
2016.12.28 |
申请号 |
EP20110874733 |
申请日期 |
2011.10.24 |
申请人 |
Toyota Jidosha Kabushiki Kaisha |
发明人 |
AOKI, Keiichiro;HAYASHITA, Go;SASAKI, Takanori |
分类号 |
F02D45/00;F01N3/20;F02D41/14 |
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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