发明名称 |
ABNORMALITY DIAGNOSIS SYSTEM OF AIR-FUEL RATIO SENSOR |
摘要 |
An abnormality diagnosis system of an air-fuel ratio sensor 40 or 41 provided in an exhaust passage of an internal combustion engine and generating a limit current corresponding to an air-fuel ratio, comprises a current detecting part 61 detecting an output current of the air-fuel ratio sensor and an applied voltage control device 60 controlling a voltage applied to the air-fuel ratio sensor. The abnormality diagnosis system applies a voltage inside a limit current region where a limit current is generated and a voltage outside the limit current region to the air-fuel ratio sensor when the air-fuel ratio of the exhaust gas circulating around the air-fuel ratio sensor is made a predetermined constant air-fuel ratio, and judges a type of abnormality occurring at the air-fuel ratio sensor based on an output current of the air-fuel ratio sensor detected by the current detecting part at this time. |
申请公布号 |
US2016131064(A1) |
申请公布日期 |
2016.05.12 |
申请号 |
US201514935714 |
申请日期 |
2015.11.09 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
HAYASHITA Go;MORIYA Hidenori |
分类号 |
F02D41/14 |
主分类号 |
F02D41/14 |
代理机构 |
|
代理人 |
|
主权项 |
1. An abnormality diagnosis system of an air-fuel ratio sensor provided in an exhaust passage of an internal combustion engine and generating a limit current corresponding to an air-fuel ratio, wherein
the system comprises a current detecting part detecting an output current of the air-fuel ratio sensor and an applied voltage control device controlling a voltage applied to the air-fuel ratio sensor, the system applies a voltage inside a limit current region where a limit current is generated and a voltage outside the limit current region to the air-fuel ratio sensor when the air-fuel ratio of the exhaust gas circulating around the air-fuel ratio sensor is made a predetermined constant air-fuel ratio, and judges a type of abnormality occurring at the air-fuel ratio sensor based on an output current of the air-fuel ratio sensor detected by the current detecting part at this time. |
地址 |
Toyota-shi JP |