| 摘要 |
Torque-down controlling conducted on an engine torque upon gear changing of an automatic transmission is implemented by converting a demand for a rate of torque-down against the engine torque into a down rate of combustion torque (an objective down rate). Further, from a difference between the present ignition timing of the engine and the MBT (Minimum Advance for Best Torque) ignition timing, the present down rate that is a rate of the present combustion torque against the combustion torque at the MBT ignition timing to subsequently multiplying the present down rate by the objective down rate so that a counter MBT down rate that is a down rate of the present combustion torque against the combustion torque at the MBT ignition timing is obtained. Thus, from the obtained counter MBT down rate, an amount of retard of ignition timing from the MBT ignition timing is calculated to implement the torque-down controlling.
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