A control device for a continuously variable transmission performs kick-down control for executing downshift if kick-down conditions are satisfied. The device includes an upshift determining unit, an upshift controller, a second-time kick-down determining unit, a second-time kick-down controller, and a second-time kick-down upshift conditions setting unit. The upshift determining unit determines whether upshift conditions are satisfied during kick-down control. The upshift controller sets an upshift amount and executes upshift if the upshift conditions are satisfied. The second-time kick-down determining unit determines whether second-time kick-down conditions are satisfied during kick-down control. The second-time kick-down controller sets a second-time kick-down downshift amount and executes downshift if the second-time kick-down conditions are satisfied. The second-time kick-down upshift conditions setting unit sets second-time kick-down upshift conditions if the second-time kick-down conditions are satisfied. If the second-time kick-down conditions are satisfied, the upshift determining unit performs determination using the second-time kick-down upshift conditions.

A vehicle with continuously variable transmission operational modes is provided. The vehicle includes a motor to provide engine torque; a driveline; a continuously variable transmission (CVT), an actuator, a memory and a controller. The CVT is configured to couple torque between the motor and the driveline. The actuator is in operational communication with the CVT to selectively set operating characteristics of the CVT. The memory stores operating instructions including operational mode. The controller is in communication with the memory and the actuator. The controller configured to control the actuator based on one or more of the operational modes.

The control mode is switched between a first control mode configured to control the speed change pump based on an actual speed ratio being an actual speed ratio of the variator, and a second control mode configured to control the speed change pump based on an actual working pressure being an actual working pressure of the variator. In the first control mode, the actual speed ratio is calculated based on a detected value of a vehicle speed; and the speed change pump is controlled to cause the actual speed ratio to approach the target speed ratio. In the second control mode, the actual working pressure is detected and the speed change pump is controlled to cause the actual working pressure to approach a target working pressure corresponding to the target speed ratio. In a situation or a condition where the detection accuracy of the vehicle speed by the vehicle speed sensor decreases, the control mode is switched from the first control mode to the second control mode.

A control device for a continuously variable transmission performs feedback control so that an actual transmission control value becomes a target transmission control value. The control device includes a phase lead compensation unit configured to perform phase lead compensation of the feedback control, a phase delay compensation unit configured to perform phase delay compensation of the feedback control, a first peak value frequency determination unit configured to change a peak value frequency of the phase lead compensation according to a transmission ratio of the continuously variable transmission, and a second peak value frequency determination unit configured to change a peak value frequency of the phase delay compensation based on the peak value frequency of the lead compensation.

A control device for a power transmission mechanism, includes: a continuously variable transmission including a primary pulley, a secondary pulley, an oil pump; and a hydraulic control device to control a primary thrust for moving a primary movable sheave of the primary pulley and a secondary thrust for moving a secondary movable sheave of the secondary pulley, so that in a case where a secondary target pressure for generating the secondary thrust is smaller than an oil pump discharge capacity when a maximum gear ratio is requested, a primary target pressure for generating the primary thrust is made smaller than that in a case where the secondary target pressure is larger than an oil pump discharge capacity.

A control apparatus of a continuously variable transmission includes a shifting controller and a detector. The continuously variable transmission includes a hydraulic pressure supplier and a continuously variable transmission unit. The continuously variable transmission unit is able to perform continuously variable shifting by a hydraulic pressure in the hydraulic pressure supplier. The shifting controller causes, when the detector detects an abnormality, the hydraulic pressure in the hydraulic pressure supplier to fall within a range that is equal to or greater than a first value and less than a second value. The first value is a value at which minimal operation performed by the continuously variable transmission unit is available. The second value is a value upon normal operation before the detector detects the abnormality.

The control mode is switched between a first control mode configured to control the speed change pump based on an actual speed ratio being an actual speed ratio of the variator, and a second control mode configured to control the speed change pump based on an actual working pressure being an actual working pressure of the variator. In the first control mode, the actual speed ratio is calculated based on a detected value of a vehicle speed; and the speed change pump is controlled to cause the actual speed ratio to approach the target speed ratio. In the second control mode, the actual working pressure is detected and the speed change pump is controlled to cause the actual working pressure to approach a target working pressure corresponding to the target speed ratio. In a situation or a condition where the detection accuracy of the vehicle speed by the vehicle speed sensor decreases, the control mode is switched from the first control mode to the second control mode.

A control device for a continuously variable transmission performs feedback control so that an actual transmission control value becomes a target transmission control value. The control device includes a phase lead compensation unit configured to perform phase lead compensation of the feedback control, a phase delay compensation unit configured to perform phase delay compensation of the feedback control, a first peak value frequency determination unit configured to change a peak value frequency of the phase lead compensation according to a transmission ratio of the continuously variable transmission, and a second peak value frequency determination unit configured to change a peak value frequency of the phase delay compensation based on the peak value frequency of the lead compensation.

Provided are a variator and a transmission controller in an engine-driven vehicle. The transmission controller has an instantaneous interruption recovery control portion configured to, upon a power reset from an instantaneous interruption during running, set a target through transmission ratio and a desired through transmission ratio to a lowest transmission ratio value by initialization and perform recovery control to recover an actual through transmission ratio of the variator to a transmission ratio value for shifting to normal control. The instantaneous interruption recovery control portion is further configured to, upon the power reset from the instantaneous interruption during the running, set a change speed of the target through transmission ratio from the lowest transmission ratio value to the desired through transmission ratio, to be higher than that under the normal control, before a time at which the desired through transmission ratio value deviates from the lowest transmission ratio value.

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.