| 摘要 |
<p>A simplification of a system for controlling a gate which is displaceable by means of a motorized drive mechanism across a rectangular gate aperture from an opened position into a closure position, whereby it is possible to detect an intrusion by an obstructing object during the movement of a gate into the closure position, is achieved due to the fact that a distance measurement detector beam is scanned across a scan area of preferably 90 deg. in the plane of gate movement, so that in a particular scan phase the distance measurement scanning beam impacts on the leading gate edge and subsequently impacts on the lateral boundary of the gate, wherein a comparison of distance measurement limit values, which correspond to a set of characteristic curves with regard to the leading gate edge and which correspond to a single characteristic curve with regard to the lateral boundary of the gate aperture, to the respective determined distance measurement values allows to detect an obstructing object when the respective occurring distance measurement value is smaller within particular tolerance ranges than the respective expected distance measurement limit values.</p> |
