Patent ID: 11946226
Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E  F | IPC E  F

Claim 0:
1. A work machine comprising:
an engine;
a variable displacement hydraulic pump that discharges a hydraulic oil by using a driving force of the engine;
a regulator that varies a discharge rate of the hydraulic pump;
a hydraulic actuator that works by using the hydraulic oil discharged from the hydraulic pump;
a rotational speed sensor that detects a rotational speed of the engine; and
a controller that controls the rotational speed of the engine and the discharge rate of the hydraulic pump, wherein
the controller is configured to:
in a state where an power of the engine or an output of the hydraulic pump has increased to an increase threshold with the rotational speed detected by the rotational speed sensor being at a first rotational speed, raise the rotational speed of the engine from the first rotational speed to a second rotational speed that is higher than the first rotational speed;
in a process of raising the rotational speed of the engine to the second rotational speed, output, to the regulator, a signal instructing reduction in the discharge rate of the hydraulic pump so as to keep the power of the engine or the output of the hydraulic pump constant; and
after the rotational speed detected by the rotational speed sensor has reached the second rotational speed, output, to the regulator, a signal instructing increase in the discharge rate of the hydraulic pump so as to make the power of the engine or the output of the hydraulic pump have a value corresponding to a request load.