Patent ID: 8903613

Claim:
A traction transmission capacity control device used for a power transmission apparatus that performs power transmission through use of traction transmission obtained by radial-direction mutual pressing contact between a first roller and a second roller, in which a traction transmission capacity of the power transmission apparatus is controlled as a result of a second-roller revolving member controlling a radial-direction mutual pressing force exerted between the first roller and the second roller, the second-roller revolving member revolving the second roller around an eccentric axis offset from a rotational axis of the second roller, the traction transmission capacity control device comprising: a controller including at least one of a revolution torque detecting section programmed to cause the second-roller revolving member to revolve the second roller and to determine revolution torque of the second roller during the revolution of the second roller, and a revolution speed detecting section programmed to causes the second-roller revolving member to revolve the second roller and to determine a revolution speed of the second roller during the revolution of the second roller; a singular-point detecting section programmed to determine a singular point concerning a singular time-series change of at least one of the revolution torque detected by the revolution torque detecting section and the revolution speed of the second roller detected by the revolution speed detecting section; and a second-roller revolution operation reference point setting section programmed to set a revolution operation reference point of the second roller based on the singular point detected by the singular-point detecting section, the controller being programmed to perform the traction transmission capacity control using the revolution operation reference point of the second roller set by the second-roller revolution operation reference point setting section.