发明名称 |
Abnormality diagnosis system of air-fuel ratio sensor |
摘要 |
An abnormality diagnosis system which can judge a downstream side air-fuel ratio sensor to be normal accurately is provided. The abnormality diagnosis system of an air-fuel ratio sensor 41 is provided with an exhaust purification catalyst 20, an upstream side air-fuel ratio sensor 40 which is provided at an upstream side of the exhaust purification catalyst, a downstream side air-fuel ratio sensor 41 which is provided at a downstream side of the exhaust purification catalyst, and a diagnosis device which uses the outputs of these air-fuel ratio sensors as the basis to diagnose abnormality of the downstream side air-fuel ratio sensor. The diagnosis device judges that the downstream side air-fuel ratio sensor is normal when a time counter which counts the time when the output air-fuel ratio of the upstream side air-fuel ratio sensor becomes a rich air-fuel ratio which is richer than the stoichiometric air-fuel ratio and the output air-fuel ratio of the downstream side air-fuel ratio sensor becomes a rich judgment reference air-fuel ratio which is richer than the stoichiometric air-fuel ratio or less becomes a predetermined judgment value which is larger than zero or more. |
申请公布号 |
AU2014330331(B2) |
申请公布日期 |
2016.12.15 |
申请号 |
AU20140330331 |
申请日期 |
2014.09.30 |
申请人 |
Toyota Jidosha Kabushiki Kaisha |
发明人 |
Miyamoto, Hiroshi;Kidokoro, Toru;Iwazaki, Yasushi;Suzuki, Kenji |
分类号 |
F02D41/14;F02D41/22;G01N27/417 |
主分类号 |
F02D41/14 |
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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