SPEED CONTROL APPARATUS FOR WORKING VEHICLE AND SPEED CONTROL METHOD THEREOF

摘要

PURPOSE: A speed control apparatus for a working vehicle and a speed control method thereof are provided to reduce a working speed of a working machine and a traveling speed of a vehicle to a desired speed range in correspondence to a change of working contents and working conditions at the time of executing a crane operation on the basis of a preset crane mode, thereby improving a working efficiency or the like. CONSTITUTION: The speed control apparatus of a working vehicle controlling a working speed of each of actuators at a time of being in a crane mode, comprises a setting device for a maximum engine speed to be set at a time of being switched to the crane mode; a setting device for setting a proper pump absorbing torque curve at the time of being switched to the crane mode; a setting device for setting a pump discharge amount introduced from an intersecting point of an engine speed torque curve at the maximum engine speed with the proper pump absorbing torque curve to be an upper limit; a setting device for an optional pump absorbing torque curve being within a range of the engine speed torque curve and capable of obtaining an optional pump discharge amount which is smaller than the pump discharge amount set as the upper limit and which is larger than a pump discharge amount introduced from the pump absorbing torque in correspondence to a minimum engine speed at the time of being in the crane mode; and a setting device for setting a pump tilt and rotation angle in correspondence to a change of the pump absorbing torque.