Control method for synchronous shifting of a transmission comprising a cotinuously variable planetary mechanism

A method of operating a continuously variable transmission having a variator operably coupled to a multiple-mode gearing having a first clutch and a second clutch, the method comprising:

• operating a continuously variable planetary having a plurality of tiltable balls in contact with a first traction ring assembly and a second traction ring assembly, wherein a speed ratio between the first traction ring assembly and the second traction ring assembly corresponds to a tilt angle of the balls;
• operably coupling the continuously variable planetary to the first clutch and the second clutch;
• comparing a current speed ratio of the transmission to an upshift speed ratio setpoint;
• comparing a current vehicle speed to an upshift vehicle speed setpoint;
• and
• commanding an upshift of the multiple mode gearing based at least in part on the comparisons.

A method of operating a continuously variable transmission having a variator operably coupled to a multiple-mode gearing having a first clutch and a second clutch, the method comprising:

• operating a continuously variable planetary having a plurality of tiltable balls in contact with a first traction ring assembly and a second traction ring assembly, wherein a speed ratio between the first traction ring assembly and the second traction ring assembly corresponds to a tilt angle of the balls;
• operably coupling the continuously variable planetary to the first clutch and the second clutch;
• operably coupling an actuator to the continuously variable planetary, the actuator configured to adjust the tilt angle of the balls, and the actuator configured to apply a holding force on the continuously variable planetary;
• comparing a current speed ratio of the transmission to an upshift speed ratio threshold;
• commanding a reduction in the holding force;
• and
• commanding an upshift of the multiple mode gearing based at least in part on the comparison to the upshift speed ratio threshold.