| 摘要 |
An intermediate target value calculating unit calculates an intermediate target value phimidtg(i) on the basis of an output phi(i-1) of an A/F ratio sensor in computation of last time and a final target value phitg(i). By the computation, the intermediate target value phimidtg(i) is set between the output phi(i-1) of the A/F ratio sensor in computation of last time and the final target value phitg(i). A correction amount calculating unit calculates a correction amount AFcomp(i) of the target A/F ratio on the basis of a deviation DELTAphi(i) between the intermediate target value phimidtg(i) and the output phi(i) of the A/F ratio sensor. Consequently, the control is hard to be influenced by variations in waste time of the subject to be controlled and an error in modeling. While maintaining the stability of the A/F ratio feedback control, higher gain can be achieved and robustness can be also increased.
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