| 摘要 |
<p>A controller of an internal combustion engine which detects in advance an air-fuel ratio of an internal combustion engine in a stae where response and accuracy are excellent, and improves a fuel consumption of the engine, an engine output and exhaust gases on the basis of the detection result. The controller sequentially calculates a first air-fuel ratio Afj at the time of fuel injection intake on the basis of the fuel quantity calculated by referring to the difference between a measured air-fuel ratio and a target air-fuel ratio, a second air-fuel ratio Afk when a gas reaches a broad band air-fuel ratio sensor (26) and a third air-fuel ratio Afn when the sensor detects an air-fuel ratio, compares the third air-fuel ratio with the measured air-fuel ratio and determines the failure of the broad band air-fuel ratio sensor (26). Since a failure is determined by allowing for a fuel transport delay, a gas transport delay and a response delay inherent to the sensor as described above, reliability can be improved and air-fuel ratio control can be effected with high accuracy. <IMAGE></p> |
