Patent ID: 11970840
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:
a front work implement including a boom, an arm, and a bucket;
a plurality of hydraulic actuators including a boom cylinder that drives the boom, an arm cylinder that drives the arm, and a bucket cylinder that drives the bucket;
an operation device that outputs an operation signal to the plurality of hydraulic actuators; and
a controller that outputs the operation signal to the boom cylinder based on the speed of the arm cylinder or performs boom-raising pressure-increasing control of correcting the operation signal such that the bucket moves on a target surface preset for a work target of the front work implement or within an area above the target surface, wherein
when an arm-dumping operation is performed by the operation device, the arm cylinder rotates the arm by being driven to a contraction side by supplying hydraulic fluid to a rod-side, and when the arm-crowding operation is performed by the operation device, the arm cylinder performing excavation construction by rotating the arm by being driven to an expansion side by supplying hydraulic fluid to a bottom-side, and
immediately after performing the arm-crowding operation by the operation device, the controller performs the boom-raising pressure-increasing control based on a speed of the arm cylinder whose raising in the arm-crowding operation has been corrected based on a rod pressure of the arm cylinder immediately before the arm-crowding operation.