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

Claim 0:
1. 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; and
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, wherein
the controller is configured or programmed to calculate the control signal based on the difference between the target rotation speed and the actual rotation speed, and if the difference between the target rotation speed and the actual rotation speed is larger than or equal to a first set value, decrease a target value for the primary pressure as compared to a case where the difference between the target rotation speed and the actual rotation speed is lower than the first set value,
the controller is configured or programmed to switch between a plurality of correction modes each including, if the difference between the target rotation speed and the actual rotation speed is larger than or equal to the first set value, performing a correction of the calculated control signal to increase or decrease the target value for the primary pressure set in accordance with the control signal, and
the controller is configured or programmed to perform the correction of the calculated control signal based on a corresponding one of correction functions defined for the respective plurality of correction modes.