Working vehicle

A working vehicle, comprising:

• a control valve unit;
• a first drive unit supplying hydraulic oil to a primary side of the control valve unit;
• a travel unit;
• a lower body provided with the travel unit;
• an upper body slewably disposed on the lower body;
• a second drive unit causing the upper body to slew;
• a cab disposed in the upper body;
• a plurality of work units and a plurality of traveling hydraulic motors operated by pressure oil from a secondary side of the control valve unit;
• an operation unit operated by an operator;
• and
• a controller,
• wherein the first drive unit includes a first hydraulic pump, a first electric motor that drives the first hydraulic pump, a first rotation speed sensor that detects a first rotation speed of the first electric motor, a second hydraulic pump, a second electric motor that drives the second hydraulic pump, and a second rotation speed sensor that detects a second rotation speed of the second electric motor,
• the first hydraulic pump and the second hydraulic pump are respectively a fixed displacement gear pump, and a check valve is disposed on an output side of the first hydraulic pump and an output side of the second hydraulic pump, respectively,
• the controller performs control of a total rotation speed obtained by combining the first rotation speed detected by the first rotation speed sensor and the second rotation speed detected by the second rotation speed sensor to match a target rotation speed calculated from a required flow quantity of the pressure oil necessary at the secondary side of the control valve unit, and
• the controller performs, when the total rotation speed obtained by combining the first rotation speed and the second rotation speed is to match the target rotation speed calculated from the required flow quantity of the pressure oil, the control of the total rotation speed to match the target rotation speed by gradually increasing the first rotation speed of the first electric motor with a minimum rotation speed set as a starting point, in a case where the first electric motor can no longer cope with the required flow quantity of the pressure oil, gradually increasing the second rotation speed, and in a case where the required flow quantity of the pressure oil is further increased, making the first rotation speed equal to the second rotation speed and gradually increasing them both.