Ultrasonic control device for a road-finisher

Abstract

Abstract A road finisher (1) has, instead of a mechanical sensing runner for producing a level-control signal for a vertically adjustable plate (4), an ultrasonic control device with at least two, preferably three, ultrasonic sensors (10, 11, 12) which are arranged in the direction of movement of the road finisher (1) at a considerable distance on the plate (4). By means of the ultrasonic sensor signals, the distances of each ultrasonic sensor (10, 11, 12) from a reference surface are detected, those values which lie outside the plane by more than a predetermined distance, which plane is determined by the measurement points assigned to the remaining distances, being rejected as incorrect measurements. The evaluation device (15) calculates the projected level at the rear edge of the plate (4) with reference to the level signals, the mutual spacings between the sensors (10, 11, 12) and the distance of a sensor from the rear edge of the plate (4). The said projected level is compared with a selectable set thickness value. The evaluation device (15) controls the tie points of the plate (4) so that the appropriate layer thickness is observed. <IMAGE>

Inventors

• 👤 Willibald Sehr
• 👤 Martin Zarniko

Bibliographic Details