Patent ID: 6027282
Filing Date: 2000-02-22
Classification: E01C,G01C,G05D

Abstract:
A control device for controlling the application of a material which is adapted to be applied to a subgrade by means of a road finisher, said road finisher comprising a tractor and a floating screed, which is attached by means of at least one drawarm to the tractor in such a way that said screed is arranged behind said tractor in the direction in which the road finisher is moving when in operation, a first end of said at least one drawarm being secured to the tractor by means of a vertically adjustable coupling device, and a second end of said at least one drawarm being rigidly secured to the floating screed, said control device having the following features:a device for detecting the height in the area of a screed edge in relation to a reference height, said screed edge being the rear lower edge of the screed in the direction of movement;a device for detecting the inclination of said at least one drawarm in relation to a reference plane; anda device for controlling the height of the vertically adjustable coupling device on the basis of the detected inclination and the detected height of the rear lower edge of the screed, wherein said device forms a height deviation value on the basis of the difference between the detected height and the target height value, determines a target-inclination-value modification value on the basis of at least a stored table in which each height deviation value has associated therewith a target-inclination-value modification value, determines a target inclination value on the basis of said target-inclination-value modification value, and produces on the basis of a comparison between the target inclination value and the detected inclination a control signal for the vertically adjustable coupling device.