Patent ID: 11885108
Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 3:
4. The work machine according to claim 1, comprising:
a plurality of hydraulic actuators that drives the machine body and the front work device;
a directional control valve that controls flow rate of a hydraulic fluid supplied from a hydraulic pump to each of the plurality of hydraulic actuators;
a limiting device that limits the operation of at least one of the machine body and the front work device by reducing a pilot pressure as the operation signal for controlling the directional control valve; and
a pressure sensor that senses magnitude of the pilot pressure as the operation signal supplied to the directional control valve via the limiting device, wherein
the controller determines that an instruction signal from the instruction device has been received when the pilot pressure as the operation signal is lower than a predetermined reference pressure, and determines that an instruction signal from the instruction device has not been received when the pilot pressure as the operation signal is equal to or higher than the reference pressure.