| 摘要 |
Strain gauges and a torque value calculating unit detect a value for torque acting on a sun gear, based on a reaction force. A torque phase detecting unit detects start of a torque phase at which only torque distribution changes while a gear ratio stays at the same level as before upshift, based on a change in the value for torque detected by the strain gauges and the torque value calculating unit. Consequently, when upshifting, an end of a piston stroke can be accurately determined by precisely detecting the torque phase during the shifting. Thus, problems such as burning of friction materials due to excessive heat generation in friction engagement elements can be eliminated. |
