Patent ID: 11965315
Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E  F | IPC E  F

Claim 1:
2. The work machine according to claim 1, including:
a solenoid proportional valve for the pump regulator that generates a pilot pressure of the pump regulator;
a solenoid proportional valve for the directional control valve that generates a pilot pressure of the directional control valve; and
a solenoid proportional valve for the bleed-off valve that generate a pilot pressure of the bleed-off valve, wherein
the bleed-off valve is connected to the pump line in parallel to the directional control valve, and
the controller is configured to
output a command signal corresponding to the target pump flow rate to the solenoid proportional valve for the pump regulator,
compute a directional control valve target opening that is a target opening for the directional control valve, on a basis of the input amount of the operation device,
output a command signal corresponding to the directional control valve target opening to the solenoid proportional valve for the directional control valve,
compute a pump flow rate increase acceleration that is increase acceleration of the flow rate of the hydraulic pump, on a basis of a current pump flow rate increase velocity of the hydraulic pump and a pump flow rate increase velocity of the hydraulic pump computed according to the target pump flow rate,
compute a bleed-off valve target opening that is a target opening for the bleed-off valve, on a basis of the pump flow rate increase acceleration, and
output a command signal corresponding to the bleed-off valve target opening to the solenoid proportional valve for the bleed-off valve.