In a toroidal continuously variable transmission (TCVT) control apparatus with
a variator unit and a ratio control hydraulic system, an electronic TCVT control
unit electronically feedback-controls a transmission ratio based on a deviation
from a desired transmission ratio, and generates a normal-period command signal
to be input to a step motor for compensating for the deviation. The control unit
determines whether the deviation can be compensated for by electronically feedback-controlling
the transmission ratio based on the deviation and generates an abnormal-period
command signal to be input to the step motor to realize a step-motor displacement
capable of shifting or diverging the transmission ratio to a speed-reduction side,
while keeping a trunnion out of contact with a stopper in the direction of the
trunnion axis, when the deviation cannot be compensated for by electronically feedback-controlling
the transmission ratio based on the deviation.