| 摘要 |
PURPOSE:To raise the accuracy of air-fuel ratio control, by standardizing the value of current supplied at the time of a control air-fuel ratio as the ratio of the same to the value of supply current corresponding to a correct, lean air-fuel ratio, and controlling the air-fuel ratio on the basis of said ratio of current value. CONSTITUTION:The air-fuel ratio controlling apparatus of this invention comprises an air-fuel ratio control means 11, which calculates at first a base injection quantity Tp in its injection quantity calculating circuit 12 on the basis of the injection-quantity signal QA and the engine-speed signal N given respectively from detecting means 16, 17. Then, the base injection quantity Tp is corrected incrementally by a correction circuit 13 on the basis of the water-temperature signal Tw and the battery voltage VB and the base injection quantity Tp is corrected further in an air-fuel ratio correcting circuit 14 by use of a first to a third correction factors alpha1-alpha3 afforded to the circuit 14 selectively via a switch 21. The base injection quantity thus corrected is applied to an injector 22 as the final injection quantity Tt. In the above control, the value of current supplied at the time of a control air-fuel ratio is standardized as the ratio of the same to the value of supply current corresponding to a correct, lean air-fuel ratio, and the air-fuel ratio is controlled on the basis of said ratio of current value. |
