Ultrasonic sensor control unit for a road finishing machine

Details Ultrasonic sensor control unit for a road finishing machine Ultrasonic sensor control unit for a road finishing machine

1992-11-13

1993-11-02

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

404 845, G01S 1500

Patent

active

052589617

ABSTRACT:
An ultrasonic sensor control unit for a road finishing machine for generating a height control signal for a vertically adjustable beam, the ultrasonic sensor control unit including at least three ultrasonic sensors which are arranged at a considerable distance from the beam in the direction of motion of the road finishing machine. The ultrasonic sensor signals determine the distances between each ultrasonic sensor and a reference surface, the values which lie more than a predetermined distance outside of a plane which is determined by the measuring points associated with the other distances being rejected as faulty measurement. On the basis of the height signals, the mutual distances of the sensors, and the distance between a sensor and the rear edge of the beam, the evaluation means calculates the projected height at the rear edge of the beam. This height is compared with a selectable desired thickness value. The evaluation means controls the tie points of the beam so that an adequate layer thickness will be created.

REFERENCES:
patent: 4722547 (1988-02-01), Kishi et al.
patent: 4924374 (1990-05-01), Middleton et al.
patent: 4961173 (1990-10-01), Sehr et al.
patent: 5009546 (1991-04-01), Domenighetti et al.

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