Browsing by Author "Mendieta Sarmiento, Miguel Angel"

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Design and evaluation of a multi-loop control strategy applied to an anti-lock braking system
(Institute of Electrical and Electronics Engineers, 2022) Mendieta Sarmiento, Miguel Angel; Izar, Farid; Minchala Ávila, Luis Ismael
This paper presents a comparative study on the performance of a non-conventional control algorithm applied to an anti-lock braking system (ABS) of a small-size vehicle. The non-conventional controller proposed in this study corresponds to a multi-loop control strategy composed of an inner and outer loop. The outer loop is developed using a sliding mode controller (SMC) based on the maximum power point tracking (MPPT) algorithm, which calculates tire slip references to get the greatest braking force while reducing the vehicle's lateral acceleration, which prevents yaw from occurring. The inner loop consists of a controller that allows the vehicle's tires to track the previously calculated slip reference by regulating the applied pressure of the master cylinder over the wheels. Two control algorithms are tested in the inner loop: PI and fuzzy PI (F-PI). The testing scenarios are the following: i) a road with a homogeneous coefficient of friction, and; ii) a split μ road with two different friction coefficients. Simulation results showed a more significant performance in braking time, braking distance, and reduction of lateral accelerations.
Design and evaluation of an energy management system applied to a lower limb robotic exoskeleton
(2021) Zhang, Huiyan
This paper presents the design, development and evaluation of an energy management system (EMS) for covering the energy demand from an autonomous lower limb exoskeleton (ALLEX) prototype. The ALLEX prototype is composed by four energy subsystems: actuators, sensing, communications, and control. The energy de-manded by ALLEX is estimated by considering metabolic requirements of neurological rehabilitation applied to the actuators subsystem, as well as average consumption of the sensing, communications, and control subsystems. The EMS proposed in this paper is composed by a lithium-ion battery bank, a battery management system (BMS), and prop-er instrumentation for measuring voltages, currents, and temperature from the battery pack. Experimental results show adequate coverage of the energy demand from ALLEX, both instantly and during continuous operation (1 hour approximately). Additionally, the efficiency of the EMS is assessed by testing the cells balancing and battery charg-ing/discharging processes, which showed equalized values of the energy cells as well as correct temperature operating values
Diseño y construcción de un sistema de gestión de energía para aplicaciones de asistencia a la movilidad en extremidades inferiores
(2019-04-15) Mendieta Sarmiento, Miguel Angel; Muñoz Jimbo, Christian Oswaldo; Gonzalez Morales, Luis Gerardo
This degree work details the construction of an energy management system that will support the project developed by the University of Cuenca, called "Prototype of usable exoskeleton on lower extremities". The proposed system will be responsible for supplying the necessary energy for the components of the exoskeleton, such as: motors, sensors, microcontrollers, etc. The energy management system will consist of 3 main parts: an energy source formed by a battery bank created through the union of 8 cells of lithium ion whose capacity was chosen based on a of the energy that will be consumed by the system, in order to obtain an autonomy of 90 minutes; an integrated circuit responsible for monitoring and taking measurements of cell voltages and temperatures through commands sent by a microcontroller, and a charger, external to the system, charged responsible for recharging the cells which make up the energy source. In order to protect the lithium ion cells, the constructive aspects of a container made of a flexible and resistant material are included, in such a way that the cells are protected against the weather. Finally, due to the weight of the batteries, a backpack will be included as a container for the components of the source and the Management System, in order to improve the portability of the project.
Minimization of energy storage in a solar farm by controlling the state of charge of a battery bank
(Institute of Electrical and Electronics Engineers Inc., 2022) Minchala Ávila, Luis Ismael; Mendieta Sarmiento, Miguel Angel
This paper presents a methodology for reducing energy storage requirements by using batteries to smooth out power variations of a solar farm. This reduction is achieved by combining the operation of an energy management system (EMS) with an optimally sized battery energy storage system (BESS). The capacity calculation of the BESS is determined by using an evolutionary algorithm. The EMS deploys a state-of-charge feedback (SOC-FB) control system to reduce the power variations of a solar farm, while the optimization algorithm determines the minimum required capacity of the BESS to keep the SOC in an acceptable range. This approach is tested by using real data from a small solar farm. Simulation results show a significant reduction of the power variation of the solar farm output, while the SOC of the BESS keeps within the operating range.