| 摘要 |
By avoiding an excessive cranking torque when starting the engine by a motor/generator and expanding a motor running region, fuel economy is improved. For a large required acceleration, cranking torque Tcr is maintained to hold an initial value, while, when the required acceleration is small, cranking torque Tcr will be adjusted to decrease. The time between an engine start command and the instant at which engine rotation speed Ne reaches a predetermined rotation speed Ne is measured as an engine start time TMst. When the TMst is below a limit value TMst_Lim that is capable of starting the engine and acceptable, as shown at instants t2 and t4, Tcr will be adjusted to decrease by a decrease amount, DeltaTcr_dec and updated, while the expression Mst>=TMst_Lim is met, then Tcr will be adjusted by an increase amount DeltaTcr_inc at instant t6 and updated.
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