Patent ID: 6171018
Filing Date: 2001-01-09
Classification: E01C,E02F,G01C,G01S

Abstract:
An automatic control system for a construction machine, comprising:a construction machine situated on a construction site and provided with a ground leveling implement, a target, and a laser sensor;a survey unit including means for projecting a first laser beam indicating a finished-plane height toward said laser sensor, said survey unit having coordinate position measuring means separate from the first laser beam for optically measuring a coordinate position of said target by projecting a second laser beam toward said target and receiving a reflection of said second laser beam from said target, said survey unit having means for scanning a third laser beam to detect a vertical position of the target;storage means for storing predetermined finished-plane height data in correspondence with horizontal coordinates of the construction site; andcomputation means for computing a finished-plane height at the measured coordinate position based on the predetermined finished-plane height data;wherein said survey unit includes means for projecting the first laser beam to a height corresponding to the finished-plane height at the measured coordinate position, wherein said construction machine includes control means for controlling said ground leveling implement so that said ground leveling implement approaches said finished-plane height based on a position at which said first laser beam is received on said laser sensor, wherein said survey unit measures the height of the target by scanning the third laser beam after ground leveling at the coordinate position, and wherein said computation means further computes a deviation based on the measured height and the finished-plane height at the coordinate position after ground leveling and the deviation is stored in said storage means and used as construction evaluation data.