Transmission control apparatus for friction-wheel CVT

A transmission ratio control apparatus for a friction-wheel continuously variable transmission comprising:

• a friction wheel disposed between an input disc and an output disc for transmitting drive force therebetween;
• a transmission ratio changing actuator that is operated in accordance with a target transmission ratio determined in accordance with operational conditions, to offset the friction wheel from a neutral position where a rotational axis of the friction wheel intersects a rotational axis of the input disc and the output disc, so as to tilt the friction wheel about a tilting axis generally perpendicular to the rotational axis of the friction wheel in order to achieve a change in transmission ratio;
• calculating means for calculating an actuator operation amount for the transmission ratio changing actuator corresponding to the target transmission ratio;
• determining means for determining a changing rate of transmission ratio;
• and
• correcting means responsive to signals from the calculating means and the determining means, respectively, for correcting the actuator operation amount corresponding to the target transmission ratio so that a change in transmission ratio is reduced as the changing rate of transmission ratio increases, and for outputting an instruction of the corrected actuator operation amount to the transmission ratio changing actuator.