Region limiting excavation control system for construction machine

摘要

PCT No. PCT/JP95/01053 Sec. 371 Date Jan. 31, 1996 Sec. 102(e) Date Jan. 31, 1996 PCT Filed May 31, 1995 PCT Pub. No. WO95/33100 PCT Pub. Date Dec. 7, 1995In an excavation area limiting control system for a construction machine for limitingly controlling an area to be excavated, a region where a front device 1A is movable is set beforehand. The position and posture of the front device are calculated based on signals from angle sensors 8a-8c, and a target speed vector of the front device is calculated based on detection signals from control lever units and load pressures detected by pressure sensors 270a to 271b. The target speed vector is modified so that a vector component of the target speed vector in the direction toward the boundary of the set region is reduced when the front device is within the set region near the boundary thereof, and the front device is returned to the set region when the front device is outside the set region. Control signals corresponding to the modified target speed vector are further modified depending on the load pressures and output to proportional solenoid valves 210a to 211b. As a result, the excavation within a limited area can be implemented efficiently and smoothly, and stable control is achieved with good accuracy regardless of change in the load pressures of hydraulic actuators.