Elevator system having dynamically variable door dwell time base

Details Elevator system having dynamically variable door dwell time base Elevator system having dynamically variable door dwell time base

1991-11-27

1993-08-10

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187130, B66B 1302, B66B 1310

Patent

active

052351432

ABSTRACT:
Disclosed are me and apparatus for establishing a Door Dwell Time for an elevator car. The method includes the steps of (a) accumulating, over a first interval of time, a total amount of time that expires between a time when a hall call is received to when an elevator door of the elevator car opens in response to the hall call; and, at the end of the interval of time, (b) determining an Average Waiting Time (AWT) by dividing the total amount of time by a number of hall calls that occurred during the first interval of time. The method further includes the steps of (c) comparing the AWT to a first AWT threshold value; and, if the AWT exceeds the first AWT threshold value, (d) decreasing the elevator car Door Dwell Time (DDT) by a time increment so as to obtain a revised DDT for use during a second time interval. If the AWT does not exceed the first AWT threshold value, the method further includes the steps of (e) comparing the AWT to a second AWT threshold value; and if the AWT is less than the second AWT threshold value, (f) increasing the elevator car DDT by the time increment so as to obtain a revised DDT for use during the second time interval.

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"Lift Supervisory Control Systems", G. C. Barney et al. Lift-Traffic Analysis Design and Control, Pub. P. Peregrinus Ltd., Chap. 3, pp. 85-147.

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