| 摘要 |
PURPOSE:To raise the extent of convergibility to a target air-fuel ratio by setting a feedback correction factor with a minute unit when a deviation out of the target air-fuel ratio of an air-fuel ratio detected and the feedback correction factor set out of a differential value of the detected air-fuel ratio are converged. CONSTITUTION:A control unit 12 sets a fundamental fuel injection quantity from each detected value of an air flow meter 13 and a crank angle sensor 14, and performs its feedback compensation on the basis of a detected value of an oxygen sensor 16. The control unit 12 converts the detected value of the oxygen sensor 16 into digital data of 10 bits, and finds a differential value on the basis of difference with the last value of upper 5 bits, and also finds a deviation to a theoretical air-fuel ratio of the actual air-fuel ratio on the basis of subtraction of the upper 5 bits equivalent to the theoretical air-fuel ratio. When this differential value and the deviation both are zero, a feedback correction factor is altered with lower 5 bits on the basis of a phase value set out of the differential value and the deviation. |
