A method of controlling a pulley ratio of a continuously variable transmission vehicle, includes: sensing, by a controller, whether or not the position of a shift lever switches to a manual range, fixing, by the controller, a pulley ratio of a continuously variable transmission, when the position of the shift lever switches to the manual range, as a result of sensing, re-adjusting, by the controller, set pulley ratios of a plurality of manual shift positions based on the fixed pulley ratio of the continuously variable transmission, after the fixation, and controlling, by the controller, the continuously variable transmission at the re-adjusted pulley ratio of a target manual shift position, when manual shifting is required, after re-adjustment.

A method for controlling a gear ratio of a continuously variable transmission vehicle includes: a step of detecting a position of a shift lever by a controller; a step of checking, by the controller, a gear ratio variation based on a difference between a desired stage gear ratio and a current gear ratio in a continuously variable transmission when the shift lever is detected to be positioned in a manual range; a step of calculating, by the controller, a gear ratio correction value based on a rate of change of engine RPM when the gear ratio variation is checked as being other than zero after the step of checking the gear ratio variation; and a step of correcting, by the controller, the gear ratio variation in response to the calculated gear ratio correction value after the calculation step.

A continuously variable transmission includes a continuous gear-change mechanism, a gear-change operating section to which a gear-change operation is input, and a gear-change controlling section changing a gear ratio of the mechanism according to the gear-change operation that is input from the operating section. A first gear-change operation and a second gear-change operation, performed subsequently to the first operation, or an input from a second gear-change operating section can be input to the operating section. The e controlling section is provided with the plural gear ratios for plural gears and previously set, causes the mechanism to perform, according to the first operation, a gear-change operation to a gear ratio for a next gear, and to perform, according to the second operation, a gear-change operation to an intermediate gear ratio set between the gear ratio for the next gear and a gear ratio for a second next gear.

A method is disclosed for operating a drivetrain of a working machine with a continuously variable transmission. The method comprises a step of detecting a current drive output rotation speed (10). The drivetrain is controlled (14) in such manner as to simulate a drivetrain with a fixed-gear transmission and a bridged converter transmission when the drive output rotation speed detected is higher than or equal to a drive output rotation speed limit. The drivetrain is controlled (16) in such manner as to simulate a drivetrain with a fixed-gear transmission and a coupled converter transmission when the drive output rotation speed detected is lower than the drive output rotation speed limit. In addition, the invention relates to a control unit for a drivetrain of a working machine with a continuously variable transmission, and a drivetrain for a working machine.

An agricultural vehicle has wheel groups, an engine group, a continuously variable transmission group connecting the engine group to the wheel groups and having a hydraulic device, user management elements for driving the agricultural vehicle and setting motion modes thereof, and vehicle management elements for detecting operating conditions of the agricultural vehicle by detecting speed of the agricultural vehicle, engine revolutions, gear ratio and hydraulic pressure value of the continuously variable transmission group. A management and command system, operatively connected to the user management elements, the vehicle management elements, the engine group and the continuously variable transmission group, commands the continuously variable transmission group in at least one driving operating configuration, in which a hydraulic action of the hydraulic device is commanded according to predefined steps, and at least one auxiliary operating configuration in which the hydraulic action of the hydraulic device is commanded according to a continuous course over time.