Browsing by Author "Milla, Freddy"

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    Bus-Stop Control Strategies Based on Fuzzy Rules for the Operation of a Public Transport System
    (IEEE, 2012) Milla, Freddy; Sáez, Doris; Cortes, Cristián E.; Cipriano, Aldo
    In the daily operation of a bus system, the movement of vehicles is affected by uncertain conditions as the day progresses, such as traffic congestion, unexpected delays, randomness in passenger demand, irregular vehicle dispatching times, and incidents. In a real-time setting, researchers have devoted significant effort to developing flexible control strategies, depending on the specific features of public transport systems. In this paper, we propose a control scheme for the operation of a bus system running along a linear corridor, based on expert rules and fuzzy logic. The parameters of the fuzzy controllers were tuned through a particle swarm optimization (PSO) algorithm. That is, the control strategies aim at keeping regular headways between consecutive buses, with the objective of reducing the total waiting time of passengers. The proposed control systems rely on measures of the position of each bus, which are easy to obtain and implement by means of emerging automatic vehicle location devices through Global Positioning System (GPS) technology. The utilized strategies are holding, stop-skipping, and the integration of both. After tuning the controller parameters, we conducted several simulation tests, obtaining promising results in terms of savings in waiting times with the implementation of the proposed rules, noting that the best performance occurred when fuzzy rules are included. The methodology has great impact, and it is easy to implement due to its simplicity.
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    Optimal fractional order adaptive controllers for AVR applications
    (2018) Ortiz-Quisbert, Marco E.; Duarte-Mermoud, Manuel A.; Milla, Freddy; Castro-Linares, Rafael; Lefranc, Gaston