| 摘要 |
PROBLEM TO BE SOLVED: To improve responsibility in a low rotational speed region of an engine when shifting an operating state from a twin turbo state to a single turbo state. SOLUTION: When it is judged that the present operating state of the engine shifts from the twin turbo region to the single turbo region (S160 to S164), on the basis of an engine rotational speed N, a single turbo region duration time judgement value T4 is set referring to a table with interpolation calculation (S165). A single turbo region duration time count value C2 is counted up and compared with the single turbo region duration time judgement value T4 (S167, S168). In case of C2<T4, the twin turbo state is maintained. In case of C2>=T4, the operating state is shifted to the single turbo state. Thus, the timing of shifting from the twin turbo state to the single turbo state is advanced in the low rotational speed region of the engine so as to prevent the operation when the torque is low in the twin turbo state, thereby improving the operatability. |
