Patent ID: 9188207
Filing Date: 2015-11-17
Classification: F16H

Abstract:
1. A continuously variable transmission comprising: an input shaft; an output shaft; a toroidal continuously variable transmission; a differential gear unit; and a controller; the input shaft being a shaft to which engine output is inputted; the toroidal continuously variable transmission comprising the differential gear unit comprising the controller being for controlling a change in the transmission gear ratio of the toroidal continuously variable transmission; and including a first function that, by adjusting the transmission gear ratio of the toroidal continuously variable transmission and changing a relative displacement speed of the plurality of gears, converts a rotational state of the output shaft to forward rotation or reverse rotation with a stopped state in between while the input shaft is being rotated as is in one direction; a second function of calculating the transmission gear ratio of the toroidal continuously variable transmission from the rotational speed of the input-side disk that is found from the input-side rotation sensor, and the rotational speed of the output-side disk that is found from the output-side rotation sensor; and a third function of performing learning control that, with satisfying specified conditions for allowing learning as a condition, adjusts the transmission gear ratio of the toroidal continuously variable transmission to a state where the rotational speed of the output shaft becomes “0”, and then learns and stores a position of the adjustment member in this state as a position where the output shaft is stopped while the input shaft is rotating as is, wherein a state in which an ignition switch for starting and stopping an engine is ON, and an engine rotational speed being a higher value than a set lower-limit rotational speed, which was set to a value lower than a target idling speed that is set by the controller, so as to eliminate from when the ignition switch is ON until the engine rotational speed reaches the set lower-limit rotational value where a rotation state of the engine becomes stable from being an object of the learning control, are included in the conditions for allowing learning for executing the learning control by the third function and wherein performing the learning control is prevented with the ignition switch being turned OFF.