Patent ID: 11905681
Assignee: KUBOTA CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E  F  B | IPC E  F

Claim 13:
14. A working machine, comprising:
a prime mover;
a rotation-speed operation actuator operable to determine a target rotation speed of the prime mover;
a rotation detector to detect an actual rotation speed of the prime mover;
a hydraulic pump driven by power from the prime mover to deliver a hydraulic fluid;
a hydraulic unit to actuate in accordance with a hydraulic fluid;
an operation valve operable to change a pilot pressure of a pilot fluid defining the hydraulic fluid supplied from the hydraulic pump to the hydraulic unit in accordance with an operation of an operation member;
an actuation valve operable in accordance with a control signal to change a primary pressure defining the pilot pressure of the pilot fluid supplied from the hydraulic pump to the operation valve;
a controller configured or programmed to output the control signal based on a difference between the target rotation speed and the actual rotation speed to the actuation valve to control an opening of the actuation valve; and
a temperature detector to detect a temperature of the pilot fluid, wherein
the controller is configured or programmed to switch between a plurality of correction modes each including calculating the control signal based on the difference between the target rotation speed and the actual rotation speed, performing a correction of the calculated control signal, and increasing or decreasing a target value for the primary pressure set in accordance with the control signal, and
the controller is configured or programmed to switch to a normal mode in a case where the temperature of the pilot fluid detected by the temperature detector is lower than a fourth threshold value, the normal mode differing from the plurality of correction modes, the normal mode involving controlling the opening of the actuation valve based on the calculated control signal without correcting the control signal.