B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/32
B66B 1/30 (2006.01) B66B 1/36 (2006.01) B66B 1/40 (2006.01)
Patent
CA 1295756
ABSTRACT OF THE DISCLOSURE A method and apparatus for smoothly stopping an elevator car at a target floor in an elevator system which utilizes a speed pattern to control car speed via a speed feedback control loop. When the elevator car reaches a predetermined slowdown point relative to a target floor, the speed pattern is changed towards a predetermined minimum non-zero value, with the non-zero value being selected to insure that the car will reach the floor in the event of error in the arrangement used to change the value of the speed pattern. The speed pattern value is then independently forced to a value indicative of zero car speed in response to a detector which detects the actual presence of the elevator car as it reaches a predetermined small dimension from the target floor, to stop the car at floor level, before a holding brake is applied.
572081
Riches Mckenzie & Herbert Llp
Westinghouse Electric Corporation
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