TRANSMISSION CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION AND TRANSMISSION CONTROL METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To prevent the thrust of a secondary pulley from being set higher than necessary when the elongation of a driving belt is considered.

SOLUTION: A transmission control device for a continuously variable transmission includes: a rotation speed ratio variation estimation means S3 for estimating the variation in a rotation speed ratio between pulleys 11 and 12 caused by the elongation of a driving force transmission member 13; a no-elongation pulley ratio estimation means S4 for estimating a no-elongation pulley ratio on the basis of input torque and the variation in the rotation speed ratio; a secondary thrust calculation means S5 for calculating a secondary thrust on the basis of the input torque and the no-elongation pulley ratio; a contact radius variation estimation means S6 for estimating the variation in a contact radius between the secondary pulley 12 and the driving force transmission member 13 due to the elongation of the driving force transmission member 13; a corrected secondary thrust calculation means S8 for correcting the secondary thrust on the basis of the variation in the contact radius and calculating a corrected secondary thrust; and a thrust control means S9 for controlling the thrust on the basis of the corrected secondary thrust.

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