Control device for continuously variable transmission

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PROBLEM TO BE SOLVED : To improve followability of transmission ratio to a desired transmission ratio by correcting an error of the transmission ratio due to manufacturing dispersion of a flow rate controlling means. SOLUTION : An estimated variation value Qmodel(n2) of working fluid capacity in a primary oil chamber 30c from the start of the change speed to the finish of the change speed is calculated using a physical model (S107 and S108). While, a detected variation value Qreal of the working fluid capacity in the primary oil chamber 30c from the start of the change speed to the finish of the change speed is calculated based on the variation of the transmission ratio (S112). A deviation δQ between the detected value Qreal and the estimated value Qmodel(n2) is calculated (S113), and a difference between a characteristic stored in a hydraulic control signal calculating means 124 and an actual characteristic of the flow rare controlling means 50 is leaned and corrected based on the deviation δQ (S114). COPYRIGHT : (C)2003, JPO