Control system for a toroidal continuously variable transmission

A control system for a toroidal continuously variable transmission comprising:

• an input disk and an output disk which are disposed opposed to each other,
• power rollers which are in abutment against said input disk and said output disk to conduct transmission of a driving force between said input disk and said output disk,
• trunnions for supporting said power rollers rotatably, said trunnions being supported displaceably in the direction of an axis of said trunnions, and tiltably about said axis,
• an actuator for displacing said trunnions in the direction of said axis to tilt said power rollers together with said trunnions, and
• a control means for driving said actuator to control a transmission ratio between said input disk and said output disk,
• wherein said control means comprises:
• an input rotation speed detection means for detecting a rotation speed of said input disk,
• an output rotation speed detection means for detecting a rotation speed of said output disk,
• a transmission ratio calculation means for calculating said transmission ratio from the input disk rotation speed and the output disk rotation speed,
• a torque estimation means for estimating one an input torque of said input disk and an output torque of said output disk,
• an axial force calculation means for calculating an axial force in the trunnion axis direction that said actuator is required to generate, based on the transmission ratio calculated by said transmission ratio calculation means and the torque estimated by said torque estimation means, and
• an actuator drive means for driving said actuator based on the axial force calculated by said axial force calculation means.