| 摘要 |
An automatic transmission system includes a regulator for regulating line pressure delivered to friction coupling elements of a transmission mechanism. The friction coupling elements are selectively coupled and released, in combination, so as to shift gear ratios. A control device controls the regulator so as to provide a proper line pressure. The control device operates to learn a correction value for the line pressure which depends upon a shift-time it takes for the transmission to complete an up-shift and corrects the line pressure according to the correction value learned from an actual shift-time. Thus, an up-shifting of the transmission is completed in a desired shift-time. The correction of the line pressure in the learning control is practically performed when the number of engine cylinders for which fuel delivery is cut off is smaller than a predetermined number. |
