Elevator dispatching employing reevaluation of hall call assignm

Details Elevator dispatching employing reevaluation of hall call assignm Elevator dispatching employing reevaluation of hall call assignm

1994-06-23

1996-10-08

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

With call registration means

Shared by plural load supports

187387, B66B 118

Patent

active

055633862

ABSTRACT:
An elevator car call is reassigned if a different car fortuitously shows up first, or if the assigned car leaves the group. The call is reassigned, one time only, if the assigned car is delayed by more than a threshold, or under certain circumstances, if the car is fully loaded without an intervening car call or the call has been waiting for more than a threshold time. The circumstances are that the weighted summation of membership values in fuzzy sets, indicating the degree to which the predicted waiting time for the currently assigned call is deemed long, the response time for a new call assignment is deemed small, and the improvement from switching the hall call assignment is deemed great, exceeds a threshold and each of the membership values exceeds its own corresponding threshold.

REFERENCES:
patent: 3682275 (1972-08-01), Loshbough et al.
patent: 4760896 (1988-08-01), Yamaguchi
patent: 5022498 (1991-06-01), Sasaki et al.
patent: 5146053 (1992-09-01), Powell et al.
patent: 5338904 (1994-08-01), Powell et al.
patent: 5427206 (1995-06-01), Powell et al.
patent: 5467844 (1995-11-01), Powell et al.

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