B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/20
B66B 1/16 (2006.01) B66B 1/34 (2006.01)
Patent
CA 1201831
26 ABSTRACT OF THE DISCLOSURE An elevator system in which distance pulses are generated in response to travel of an elevator car and used to update a car position counter. The difference between the car position count and a count representative of the location of the target floor is determined when the elevator car reaches a predetermined distance from the target floor, and this distance-to-go (DTG) count is used to provide a speed pattern for decelerating and landing the car at floor level. A zone of fixed length is pro- vided on each side of each floor, and when this zone is detected, the DTG count is compared with a count repre- sentative of this fixed length. If they differ within a predetermined tolerance, it is known that a proper landing will or can be made, and the DTG count is changed to the correct value at the instant the zone is detected. Door preopening may be enabled at this time. If the difference exceeds the predetermined tolerance, no corrective action is taken, the door preopening is not enabled. The amount of the difference may also be subjected to various checks for determining if the elevator car should be taken out of service, or allowed to continue to run.
461202
Kersen Matthew F.
Uherek Vladimir
Oldham And Company
Westinghouse Electric Corporation
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