| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission characteristic both good and repeatable by computing a pressure adjustment instruction value for keeping the preset value of hydraulic pressure supplied to a frictional engagement device during the initial period of a recognized inertia phase. SOLUTION: In the acceleration signal calculation means 32 of a controller 31, a differential value or a difference between a transmission output shaft speed No for the current operational period and a transmission output shaft speed No for the previous operational period is divided by the operational period, thereby calculating acceleration along the forward and backward direction of a vehicle. This acceleration along the forward and backward direction of the vehicle has a relationship of similarity with the torque of the transmission output shaft and, therefore, torque phase and an inertia phase at the time of a gear change operation can be found from the acceleration along the forward and backward direction of the vehicle. In other words. a gear change state can be recognized. Also, a torque fluctuation over the first half of the inertia phase is restrained on a feed-forward basis, thereby improving the robust function of subsequent feedback control, and providing a good and repeatable transmission characteristic. |
