Patent ID: 11879233
Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A work machine comprising:
a work device installed on a machine main body;
a plurality of actuators that drive the machine main body and the work device;
a posture sensor that senses postural data about the machine main body and the work device; and
a controller that computes a degree of proximity that is an index value indicating proximity between a preset intrusion prohibition region, and the work device and the machine main body on a basis of positional data about the intrusion prohibition region and the postural data, and when the proximity specified by the degree of proximity is closer than proximity specified by a degree-of-proximity threshold set as a threshold for the degree of proximity, executes operating area limiting control to decelerate at least one of the plurality of actuators such that an intrusion of the work device and the machine main body into the intrusion prohibition region is prevented,
the work machine further comprising a storage device that stores history data about the degree of proximity computed by the controller,
the controller altering the degree-of-proximity threshold on a basis of the history data about the degree of proximity stored in the storage device,
the degree of proximity being a distance between the work device and the machine main body, and the intrusion prohibition region,
the controller executing the operating area limiting control when the distance is shorter than the degree-of-proximity threshold, and lowers the degree-of-proximity threshold as dispersion of the distance decreases.