CONTROL DEVICE FOR AUTOMATIC TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To eliminate man-hour for preparing a map for torque return control.

SOLUTION: A dynamic model is used to indicate the behaviors of an automatic transmission to a time t which has elapsed after the starting of an inertia phase. This dynamic model includes a linear term to the elapsed time t, a term obtained by integrating a transmitted torque amount in an engaging clutch of the automatic transmission, and a time change of an engine torque. An input shaft rotational speed at the elapsed point of a target inertia phase time tir passes is estimated by using the dynamic model, and the torque return control is started at the time when a result that the rotational speed meets synchronous rotational speedωt_af in finishing speed changing is obtained. Therefore, favorable synchronization can be obtained more easily in finishing speed changing. Performing this control requires no map preparation.

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