B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
B66B 3/02 (2006.01) B66B 1/34 (2006.01) B66B 5/02 (2006.01)
Patent
CA 2059009
ABSTRACT In an elevator system, primary marking means, placed near every floors and secondary marking means placed near alternate floors are read by a scanner. Upon scanning, a marking number signal is provided indicating whether a primary marking means and secondary marking means, or only a primary marking means, is read at a floor level. As the car moves in the hoistway, current position, direction of the elevator car, and the marking number signal is continuously updated and stored in non-volatile memory. Upon recovery from a loss of power, the car is moved to the next floor in the direction it was moving prior to loss of power. By comparing the marking number signal stored in non-volatile memory before power was lost with the marking number signal generated after regaining power, the stored position can be confirmed to be correct or, if incorrect, incremented or decremented by one floor, depending upon whether the car was moving up or down respectively, to identify the actual car position.
Barkman William F.
Kezer Jeremy B.
Shull Julian H. Jr.
Gowling Lafleur Henderson Llp
Otis Elevator Company
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