E - Fixed Constructions – 05 – F
Patent
E - Fixed Constructions
05
F
E05F 5/00 (2006.01) E05F 15/20 (2006.01)
Patent
CA 2315122
Method of detecting obstructions encountered by a motorized door. The method includes providing a signal processor with one or more signals indicative of a predetermined door trajectory profile for at least a segment of a stroke of the door, the door trajectory profile providing an ideal speed and/or position versus an elapsed time since a beginning of the segment of the stroke. A door position signal from a position encoder for the door is received into the signal processor. The method includes generating one or more signals indicative of the velocity and/or position of the door from the door position signal and generating a trajectory discrepancy signal based on the velocity and/or position in relation to the ideal speed and/or position. A motor control signal is generated based on the trajectory discrepancy signal and the motor control signal is connected to motor control circuits connected to drive the motor for the door. The method further includes performing one or more tests on either the trajectory discrepancy, the velocity of the door or the position of the door to determine whether the door has encountered an obstruction, in which case an obstruction detection signal is generated. The obstruction detection signal is for stopping the door.
Macrae & Co.
Westinghouse Air Brake Company
LandOfFree
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