Method for avoiding terminal landing position initialization aft

Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support

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B66B 302

Patent

active

051533901

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.

REFERENCES:
patent: 3898611 (1975-08-01), Mandel
patent: 4096925 (1978-06-01), Koob et al.
patent: 4433756 (1984-02-01), Caputo et al.
patent: 4436185 (1984-03-01), Ludwig et al.
patent: 4658935 (1987-04-01), Holland
patent: 4750592 (1988-06-01), Watt

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