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

Claim 4:
5. 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 pressure detector to detect a secondary pressure defining the pilot pressure output from the operation valve to the hydraulic unit, wherein
the controller is configured or programmed to switch between a plurality of 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 perform a first correction involving correcting the control signal such that the target value for the primary pressure is changed in accordance with the secondary pressure detected by the pressure detector, the first correction being the correction performed in at least one of the plurality of modes.