Patent ID: 9057161
Filing Date: 2015-06-16
Classification: E01C

Abstract:
1. A method of controlling a height of a machine frame of a road construction machine relative to a ground surface as the road construction machine moves over the ground surface, comprising: (a) transmitting with a transmitter at least one measuring beam to define a reference plane, the reference plane extending parallel to one of the machine frame and the ground surface at a reference location; (b) detecting the at least one measuring beam with a receiver associated with the other of the machine frame and the ground surface at the reference location, and thereby measuring the height of the machine frame relative to the reference location on the ground surface, one of the transmitter and receiver being rigidly connected to the machine frame, wherein both the transmitter and the receiver are moving with the road construction machine over the ground surface during steps (a) and (b); and (c) controlling the height of the machine frame relative to the reference location on the ground surface in response to the height measured in step (b).