| 摘要 |
A transmission control device includes a load increase rate computation portion and a transmission control portion. The load increase rate computation portion is configured to compute an increase rate of a load acting on the work vehicle. The transmission control portion is configured to shift a high-speed gear down to a low-speed gear with producing a lock-up state in which a lock-up clutch is engaged when the load increase rate is less than a load increase rate threshold in shifting the high-speed gear down to the low-speed gear, and producing a torque converter state in which the lock-up clutch is disengaged when the load increase rate is equal to or greater than the load increase rate threshold in shifting the high-speed gear down to the low-speed gear.
|
