Distributed approach to group control of elevator systems using fuzzy logic and FPGA implementation of dispatching algorithms

Authors:
Daniel M. Muñoz;Carlos H. Llanos;Mauricio Ayala-Rincón;Rudi H. van Els
Affiliations:
Department of Mechanical Engineering, Universidade de Brasília, Brasília, D.F. 70910-900, Brazil;Department of Mechanical Engineering, Universidade de Brasília, Brasília, D.F. 70910-900, Brazil;Department of Mathematics, Universidade de Brasília, Brasilia, D.F. 70910-900, Brazil;Department of Mechanical Engineering, Universidade de Brasília, Brasília, D.F. 70910-900, Brazil
Venue:
Engineering Applications of Artificial Intelligence
Year:
2008

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Abstract

Elevator systems are administrated by an elevator group control system (EGCS) and micro-processed sub-systems implementing a local control system (LCS) for each elevator. This paper describes the validation of five dispatching algorithms for elevator systems that were implemented on Spartan 3 FPGA-based boards in an integrated approach reducing the area and improving performance. The overall system is composed of several LCS, which implement the dispatching algorithms, an RS485-based network and a virtual environment called virtual elevator interface system (VEI), which includes a simulator/monitoring system and an EGCS-based on fuzzy logic (FEGCS). The FEGCS runs on a PC and, under different traffic situations, determines the best algorithm to be run in each LCS in order to reduce the user waiting time and the power consumption. The novelty of this approach is that the LCSs are capable to run different dispatching algorithms independently, that are suitable for specific passenger traffic situations, while the FEGCS only must determine the best algorithm to be run in each LCS. The VEI allows the designer to test and validate in a flexible way the algorithm performance for different traffic situations.