Elevator control apparatus

Details Elevator control apparatus Elevator control apparatus

1986-03-05

1987-09-08

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 508

Patent

active

046918078

ABSTRACT:
An elevator control apparatus for controlling operation of a cage in an elevator system in which a normal speed command signal is generated having a normal pattern providing gradually decreasing terminal speed as the cage approaches a level of a terminal floor; a terminal-floor slowdown signal is generated having a normal pattern generally similar to the normal pattern of the normal speed command signal and separated therefrom by a magnitude determined by a bias value; the normal speed command signal is chosen as a final terminal slowdown command signal for controlling terminal speed of the cage when, based on comparing the command signals, the normal speed command signal is less than the terminal-floor slowdown command signal, or the terminal-floor slowdown command signal is chosen as the final terminal slowdown command signal for controlling terminal speed of the cage when, based on comparing the command signals, the normal speed command signal is not less than the terminal-floor slowdown command signal; and the terminal-floor slowdown command signal is corrected when chosen as the final terminal slowdown command signal by changing the bias value used in generating the final terminal-floor slowdown command signal; whereby the final terminal slowdown command signal follows at least a final portion of the normal pattern of the normal speed command signal.

REFERENCES:
patent: 4225015 (1980-09-01), Yamada
patent: 4456096 (1984-06-01), Kajiyama
patent: 4503939 (1985-03-01), Lawrence et al.

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