Drive Control Device for Work Vehicle

A drive control system for a working vehicle, said drive control system being provided with:

• a controller for performing drive control of the working vehicle,
• an engine speed factor detection means for outputting, to the controller, an actual revolution speed signal corresponding to an actual revolution speed of the engine,
• a forward/reverse command means for outputting, to the controller, a forward/reverse switching signal for the working vehicle,
• an accelerator depression stroke detection means for outputting, to the controller, an accelerator pedal signal corresponding to a depression stroke of an accelerator pedal,
• a variable displacement hydraulic pump drivable by the engine, and
• an absorption torque changing means for controlling a torque to be absorbed by the variable displacement hydraulic pump according to an absorption torque command outputted from the controller, wherein:
• the controller performs a determination as to whether or not the forward/reverse switching signal from the forward/reverse command means has been received, a determination as to whether or nor the accelerator pedal signal is a signal during non-operation of the accelerator pedal, and a determination as to whether or not the actual revolution speed of the engine is not higher than a threshold level which has been stored beforehand, and
• when the forward/reverse switching command is determined to have been received, the accelerator pedal signal is determined to be the signal during the non-operation of the accelerator pedal and the actual revolution speed of the engine is determined to be not higher than the threshold level which has been stored beforehand, the controller sends, to the absorption torque control means, an absorption torque command which minimizes the torque to be absorbed by the variable displacement hydraulic pump.