A method of controlling a continuously variable transmission includes monitoring powertrain operating conditions, and calculating, via an electronic controller, a commanded clamping force based on the powertrain operating conditions, wherein the commanded clamping force includes a commanded clamping force of an input pulley and a commanded clamping force of an output pulley on the endless rotatable device. The method also includes activating, via the electronic controller, at least one of the input actuator and the output actuator such that an axial component of the input wedge force and the axial force of the input actuator together provide the commanded clamping force of the input pulley, and an axial component of the output wedge force and the axial force of the output actuator together provide the commanded clamping force of the output pulley.

A product may include a rotating sheave that may have a first sheave half and a second sheave half. A distance between the first and second sheave halves may be variable. A screw actuator may have a screw that may engage the first sheave half. A motor may be connected with the screw and may be operable to move the first sheave half to vary the distance through the screw.

An actuating cylinder has a housing with a main body and a front cover. An actuation rod is mounted for longitudinal movement relative to the housing. An electric motor has a stator and a rotating rotor shaft that is disposed around a screw of a screw mechanism that is connected to the actuation rod. A plurality of rolling elements convert a rotational movement of the rotor shaft into a linear, translation movement of the screw and of the actuation rod. A bearing supports the rotation of the rotor shaft with respect to the housing. A load path ring has an outer ring portion in axial abutment against a fixed part of the bearing, and an inner ring portion connected internally to the outer ring portion. A load sensor is axially clamped between the front cover and the inner ring portion of the load path ring.

A self-shifting bicycle that shifts intelligently as a function of power output. The bicycle uses a computer control system mounted to the handlebar, a power meter attached to the front gearwheel, and an actuator module for adjusting the transmission. The computer control system software changes output gear ratio in accordance with load encountered as the cyclist rides. This allows the rider to set a preferred power output and to maintain that preferred power output very closely.

A transmission speed control system for a walk-behind lawn mower includes a transmission, a transmission positioning assembly, and an electronic control unit. The transmission is tiltable about and operably engaged with a drive axle shaft. The transmission positioning assembly tilts the transmission between first and second angular positions. A belt tension between a drive belt and a transmission pulley of the transmission continuously increases from a minimum belt tension when the transmission is in the first angular position to a maximum belt tension when the transmission is in the second angular position. The rotational drive force exerted on the drive axle shaft by the transmission and a resulting driving speed of the lawn mower vary proportionally with the belt tension. The electronic control unit controls the transmission positioning assembly to tilt the transmission based on target and detected driving speeds.

A continuously variable transmission (CVT) is provided for use on a recreational or utility vehicle. The CVT is electronically controlled by a control unit of the vehicle. The CVT includes a primary clutch having a first sheave, a second sheave movable relative to the first sheave, and a friction clutch. An actuator assembly is configured to actuate the primary clutch and cause movement of the second sheave.

A method of controlling a continuously variable transmission includes monitoring powertrain operating conditions, and calculating, via an electronic controller, a commanded clamping force based on the powertrain operating conditions, wherein the commanded clamping force includes a commanded clamping force of an input pulley and a commanded clamping force of an output pulley on the endless rotatable device. The method also includes activating, via the electronic controller, at least one of the input actuator and the output actuator such that an axial component of the input wedge force and the axial force of the input actuator together provide the commanded clamping force of the input pulley, and an axial component of the output wedge force and the axial force of the output actuator together provide the commanded clamping force of the output pulley.

Provided is a transmission control system that enables more precise control of the transmission ratio. This transmission control system is provided with a motor, an actuator, a transmission, a position sensor, a current sensor, and a control unit. The control unit includes: a drive unit that drives the motor while the vehicle is stopped; and a first estimation unit that estimates the initial transmission ratio, which indicates the transmission ratio when the ignition switch is turned on, on the basis of a rotation position detected by the position sensor, a load current detected by the current sensor, and a characteristic curve over a period during which the drive unit is operating.

A continuously variable transmission control system for a rolling vehicle includes an electrically controlled device electrically connected to a transmission driving unit connected to a belt-driven continuously variable transmission or a ball-driven continuously variable transmission. The belt-driven continuously variable transmission includes a driving wheel, a driven wheel and a conveyor belt. The conveyor belt is movably fitted in the driving wheel and the driven wheel. The ball-driven continuously variable transmission includes a transmission frame, transmission units, an annular driving unit, two oblique support units, a power-input rotor and a power-output rotor. Therefore, the continuously variable transmission control system for a rolling vehicle uses the electrically controlled device and the continuously variable transmission to enhance efficiency of transmission.

An automatic transmission for an electric vehicle includes: a belt type continuously variable transmission mechanism; a constantly meshed parallel shaft type gear transmission mechanism which is connected to an output portion of the belt type continuously variable transmission mechanism, and which has a plurality of shift stages; an input gear which is disposed to the input shaft to be rotated relative to the input shaft, and which is drivingly connected to one of a plurality of shift gears fixed to an output side shaft of the constantly meshed parallel shaft type gear transmission mechanism; and an engaging clutch mechanism which is disposed to the input shaft, and which selectively connects one of the input portion of the belt type continuously variable transmission mechanism and the input gear to the main electric motor.