| 摘要 |
The invention provides a shift control apparatus of a working vehicle in which an excellent shift operability can be obtained without reference to an incline of a travelling road, a loading amount and a road condition without necessity of learning a time for controlling an engine. Accordingly, a transmission controller (40) outputs a command of setting the hydraulic pressure (Pa) of the clutch before the shift operation corresponding to the speed stage before the shift operation to 0 value to the electromagnetic proportional control valve at a time of starting the shift operation when the shift operation to the low speed stage is performed in a state that the accelerator pedal (20) is stepped down. The transmission controller (40) also outputs a command of standing up the hydraulic pressure (Pa) of the clutch after the shift operation corresponding to the speed stage after the shift operation to the electromagnetic proportional control valve when an absolute value of the input shaft conversion relative speed (Nr) obtained by subtracting the input shaft conversion rotational speed in the speed stage after the shift operation of the transmission output shaft rotational speed from the transmission input shaft rotational speed (Ni) is smaller than a predetermined small speed threshold so as to shift. |
