Working vehicle

A working vehicle comprising:

• an engine;
• a variable displacement traveling hydraulic pump that is driven by the engine;
• and
• a variable displacement traveling hydraulic motor that is connected to the traveling hydraulic pump through a closed circuit and transmits drive force of the engine to wheels, wherein
• the working vehicle further comprises:
• a pressure sensor configured to detect load pressure of the traveling hydraulic motor;
• and
• a controller configured to control the engine and the traveling hydraulic motor,
• the controller is further configured to:
• determine whether a pressure detection value detected by the pressure sensor is included in a predetermined first pressure range of greater than load pressure of the traveling hydraulic motor corresponding to a state where the working vehicle is traveling on a flat ground, or a predetermined second pressure range of greater than the load pressure of the traveling hydraulic motor corresponding to the state where the working vehicle is traveling on the flat ground and smaller than load pressure of the traveling hydraulic motor corresponding to a state where work requiring maximum traction force of the working vehicle is performed;
• and
• in a case of determining that the pressure detection value detected by the pressure sensor is included in the predetermined first pressure range or the predetermined second pressure range, output a motor command signal to the traveling hydraulic motor so as to increase displacement volume of the traveling hydraulic motor from a minimum value to a maximum value within the predetermined first pressure range or the predetermined second pressure range, and output an engine command signal to the engine so as to increase maximum rotational speed of the engine only within the predetermined first pressure range or the predetermined second pressure range.