| 摘要 |
A feedback type air-fuel ratio control system controls the air-fuel ratio of air-fuel mixture fed to an internal combustion engine in accordance with an information signal issued from a first oxygen sensor installed in an exhaust line of the engine. The exhaust line has a catalytic converter at a position downstream of the first oxygen sensor. There is further provided a system in the control system, which detects deterioration of the first oxygen sensor. The system comprises a computer and a second oxygen sensor of delayed response type installed in the exhaust line at a position upstream of the converter. The computer defines higher and lower slice levels with respect to the output of the second oxygen sensor and compares the output of the second oxygen sensor with the higher and lower slice levels. |
