| 摘要 |
PROBLEM TO BE SOLVED: To make operation properties and exhaust gas purification performance with each other in a high load area by properly controlling an air-fuel ratio at each cylinder group. SOLUTION: In a high load area wherein a fundamental fuel injection amount Tp exceeds a set value Tp0, a value of a feedback control constant is set at S15 and S17 such that the deviation width of an air-fuel ratio is lower than that in a low load area. Meanwhile, by using the air-fuel ratio detecting value OSRA of one cylinder group, the feedback correction factorαA is set at S20-S29. The feedback correction factorαB of the other cylinder group is set to a value higher theαA by a valueβ(S18) set as the function of an engine rotation speed N and this way brings the other cylinder group into further rich shift than one cylinder group.
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