Patent ID: 7970519

Claim:
An earthmoving system, comprising: a laser transmitter for transmitting a reference beam of laser light, a bulldozer, having a frame and a cutting blade supported by a blade support extending from said frame, said blade support including hydraulic cylinders for raising and lowering said blade in relation to said frame, a laser receiver mounted on a mast extending upward from, and movable with, said cutting blade, said laser receiver sensing said reference beam of laser light, an inclinometer mounted for movement with said cutting blade to provide an indication of the inclination of said blade, a sensor for detecting turning of said bulldozer, and a control, responsive to said laser receiver, to said inclinometer, and to said sensor, for controlling the operation of said cylinders and adjusting the position of said blade, said control keeping said blade at an unchanged level when rapid turning of said bulldozer is detected regardless of the output from the inclinometer, whereby erroneous vertical movement of the blade is reduced.