| 摘要 |
PURPOSE:To carry out the air-fuel ratio feedback control which is correct as a whole by adjusting at least one air-fuel ratio between two cylinder banks by the output of an auxiliary air-fuel ratio sensor and adjusting the other air- fuel ratio on the basis of the relative control deflection. CONSTITUTION:The air-fuel ratio of at least one bank M1-1 between two cylinder banks is adjusted by a feedback control means M3-1 on the basis of the output values of an air-fuel ratio sensor M3-1 and an auxiliary air-fuel ratio sensor M4. The air-fuel ratio of the other bank M1-2 is adjusted by obtaining the air-fuel ratio feedback control correction quantity by a calculating means M7 on the basis of the relative control deflection of the air-fuel ratio Which is detected by the air-fuel ratio sensors M3-1 and M3-2 which is detected by a control deflection detecting means M6 and the output of an auxiliary air-fuel ratio sensor M4 and correcting the air-fuel ratio feedback control quantity supplied from a main air-fuel ratio sensor M3-2 by a control means M8. Thus, the air-fuel ratio feedback control which is correct as a Whole can be carried out.
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