Patent ID: 6152648
Filing Date: 2000-11-28
Classification: E01C

Abstract:
An obstruction avoidance control system for a cold planer having a vertically adjustable chassis supported at a desired elevation above a roadway by a plurality of extendable and retractable support members and a planing cylinder rotatably mounted on the chassis, the system comprising:at least one operator control console for providing obstruction avoidance command signals;at least one grade sensor mounted to the chassis proximate the planing cylinder for providing first elevational signals representative of the elevational difference between the grade of the roadway and the planning cylinder;a controller associated with a memory having stored set point values, for receiving the obstruction avoidance command signals and elevational signals, comparing said elevational signals to the set point values, and responsive to said obstruction avoidance command signals and said comparison, producing output signals for adjusting the elevation of the chassis and having an adjustment speed selected on the basis of said comparison; andat least one valve in fluid communication with at least one of the plurality of extendable support members for receiving said output signals and extending or retracting the extendable support members in response to said output signals.