| 摘要 |
A control system for controlling movement of individual hydraulically moveable ends of a screed head carried by a boom of a machine so as to maintain a selected elevation position between each end of the screed head and a reference in a concrete paving application as the screed head is moved toward the machine, includes elevation receivers mounted on the ends of the screed head, and a first sensor for sensing the orientation of the screed head along its length from the first end to the second end of the screed head. A second sensor senses rotational movement of the machine which will induce an error in the output of the first sensor, and providing an output indicating such rotational movement. A control circuit is responsive to the elevation receivers and to the first and second sensors for controlling the hydraulically moveable ends of the screed head using the signals from the elevation receivers when they are not blocked, and for controlling the hydraulically movable ends of the screed head using the signals from the first and second sensors, and one of the elevation receivers when the other of the elevation receivers is blocked.
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