| 摘要 |
PROBLEM TO BE SOLVED: To provide technique capable of suitably restraining deterioration of control caused by change of a driving transmission state in a vehicle control device during air-fuel ratio lowering control. SOLUTION: During air-fuel ratio lowering control, a speed change line map is switched from an ordinary speed change line map to an air-fuel ratio lowering control speed change line map wherein timing of shift-up is delayed, and thereby, timing for changing the driving transmission state by a transmission is delayed later than the prescribed timing. During delay, an engine rotation speed is not rapidly changed, and exhaust flow rate flowing into an exhaust emission control catalyst is not drastically changed. Thus, during delay, the air-fuel ratio of the exhaust can be stably controlled so as to be a target air-fuel ratio. Accordingly, control deterioration by shift-up in air-fuel ratio lowering control can be suitably restrained. COPYRIGHT: (C)2008,JPO&INPIT
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