Dither-less extremum seeking for hydrogen minimization in PEM fuel cells

This paper presents a nonsmooth adaptive extremum seeker that minimizes the hydrogen consumption in a fuel-cell system. The extremum seeker operates by estimating the gradient of the objective function but, unlike other seekers, it does not require a dither signal to produce such estimate. The absence of a dither signal simplifies the choice of parameter values for the seeker, and more importantly, it allows it to converge to the optimal value exactly, not only to a small neighborhood. The proper functioning of the proposed scheme is proved using nonsmooth Lyapunov analysis. The strategy is tested on the input-output map of a real polymer electrolyte fuel cell.The research of C. Kunusch has been supported by the Seventh Framework Programme of the European Community through the Marie Curie actions (GA: PCIG09-GA-2011-293876), the Puma-Mind project (GA: FCH-JU-2011-1-303419), the CICYT project DPI2011-25649 (MINECO-Spain), the CSIC MACPERCON project (201250E027) and the CSIC JAE-DOC Research Programme.Peer Reviewe

On the implementation of an adaptive extremum seeking algorithm for hydrogen minimization in PEM fuel cell based systems

This work presents initial experimental results of an adaptive sliding-mode extremum seeker that minimizes the hydrogen consumption in a fuel cell based system. The extremum seeker is based on the classical steepest-descent method, the main challenge being the fact that the gradient of the objective function is unknown. The gradient is estimated by means of a sliding-mode adaptive estimator. The strategy is applied in experimental practical situations in a fuel cell test bench, this allows to asses the performance of the scheme as well as the difficulties that arise in real applicationsPeer ReviewedPostprint (author’s final draft

On the implementation of an adaptive extremum seeking algorithm for hydrogen minimization in PEM fuel cell based systems

This work presents initial experimental results of an adaptive sliding-mode extremum seeker that minimizes the hydrogen consumption in a fuel cell based system. The extremum seeker is based on the classical steepest-descent method, the main challenge being the fact that the gradient of the objective function is unknown. The gradient is estimated by means of a sliding-mode adaptive estimator. The strategy is applied in experimental practical situations in a fuel cell test bench, this allows to asses the performance of the scheme as well as the difficulties that arise in real applicationsPeer ReviewedPostprint (author’s final draft

Club Atlético Talleres de Remedios de Escalada : Historia de la crisis del club

La siguiente ponencia está enmarcada dentro del proyecto de investigación 33B104 "La relación entre los poderes públicos y los clubes de fútbol: el caso Talleres de Remedios de Escalada 1990-2012", llevado a cabo en la Universidad Nacional de Lanús. El presente trabajo abordará la crisis institucional del Club Atlético Talleres de Remedios de Escalada, un proceso que, aún de origen impreciso, puede rastrearse a comienzos de la década del 90, en el contexto de crisis socioeconómica en el marco de las denominadas políticas neoliberales. Crisis de alcance nacional que, entre varios efectos que desencadenó, produjo desequilibrios institucionales en numerosos clubes de fútbol de la Argentina. Pretendemos describir la historia de la crisis de la institución que la llevó a la quiebra en 1999, y a la vez, analizar el proceso de recuperación de la misma en el año 2008. La particularidad del caso que nos compete, radica en las características de los actores intervinientes, en las luchas de intereses, y en las circunstancias políticas, sociales y económicas que llevaron al mismo a lidiar con semejante realidad. En la crisis y resurrección de Talleres hemos podido, por lo menos por ahora, encontrar algunos lineamientos para poder comprender íntegramente las consecuencias que produjo el neoliberalismo sobre la realidad de clubes de fútbol de la Argentin

Importância do trabalho na fase pós-confinamento como ferramenta para a reinserção social dos libertos. Lei provincial 14.301 e suas projeções para a esfera municipal

En el Derecho Internacional de los Derechos Humanos, la resocialización y reinserción del condenado es la finalidad inherente que debe perseguirse en la etapa de ejecución de las penas privativas de la libertad. Existe una vasta legislación que permite aseverar la conclusión precedente. El Estado se encuentra convencionalmente obligado a poner en práctica mecanismos eficaces que tiendan a la obtención del objetivo mencionado. Lo expuesto importa que el deber del Estado y de la sociedad en su conjunto no culmina en el momento en que el recluso es puesto en libertad. Se vuelve menester la implementación de mecanismos y servicios que tiendan a prestar al liberado una asistencia postencierro que le permita afrontar el difícil período que constituye aquel en el cual recupera su libertad, contribuyendo a minimizar los prejuicios que sobre él puedan recaer y, por supuesto, disminuir las causas que puedan eventualmente conducirlo a una recaída delictual.According to the International Law of Human Rights, the re-socialization and reinsertion of the convicted person is the inherent purpose to be pursued in the execution stage of imposition of a custodial sentence or measure involving deprivation of liberty. There is a vast legislation that allows to assert the previous conclusion. The State is conventionally bound to implement effective mechanisms aimed at achieving the aforementioned objective. This means that the duty of the State and society as a whole does not culminate in the moment in which the prisoner is released. It become necessary to implement of mechanisms and services that tend to provide the released a post-confinement assistance that allows him to face the difficult period in which he regains his freedom, helping to minimize the prejudices that may fall on him and reduce the causes that may eventually lead to recidivism.No Direito Internacional dos Direitos Humanos, a re-socialização internacional e reinserção dos condenados é o propósito inerente a ser perseguido em fase de implementação da privação de liberdade. Existe uma vasta legislação que permite afirmar a conclusão anterior. O Estado é obrigado, convencionalmente, a implementar mecanismos eficazes para alcançar o objetivo acima mencionado. O precedente abarca que o dever do Estado e da sociedade como um todo não culmine no momento em que o prisioneiro é liberto. É necessária a implementação de mecanismos e serviços que tendem a prestar ao liberto uma assistência pósdetenção que lhe permita enfrentar o período difícil que é aquele em que recupera sua liberdade, contribuindo a minimizar os preconceitos que podem recair sobre ele e ajudando a minimizar as causas que podem levar a uma recaída delitiva.Facultad de Ciencias Jurídicas y Sociale

Importancia del trabajo en la etapa de post-encierro como herramienta de reinserción social de los liberados. La Ley Provincial 14.301 y sus proyecciones al ámbito municipal

En el Derecho Internacional de los Derechos Humanos, la resocialización y reinserción del condenado es la finalidad inherente que debe perseguirse en la etapa de ejecución de las penas privativas de la libertad. Existe una vasta legislación que permite aseverar la conclusión precedente. El Estado se encuentra convencionalmente obligado a poner en práctica mecanismos eficaces que tiendan a la obtención del objetivo mencionado. Lo expuesto importa que el deber del Estado y de la sociedad en su conjunto no culmina en el momento en que el recluso es puesto en libertad. Se vuelve menester la implementación de mecanismos y servicios que tiendan a prestar al liberado una asistencia postencierro que le permita afrontar el difícil período que constituye aquel en el cual recupera su libertad, contribuyendo a minimizar los prejuicios que sobre él puedan recaer y, por supuesto, disminuir las causas que puedan eventualmente conducirlo a una recaída delictual.En el Derecho Internacional de los Derechos Humanos, la resocialización y reinserción del condenado es la finalidad inherente que debe perseguirse en la etapa de ejecución de las penas privativas de la libertad. Existe una vasta legislación que permite aseverar la conclusión precedente. El Estado se encuentra convencionalmente obligado a poner en práctica mecanismos eficaces que tiendan a la obtención del objetivo mencionado. Lo expuesto importa que el deber del Estado y de la sociedad en su conjunto no culmina en el momento en que el recluso es puesto en libertad. Se vuelve menester la implementación de mecanismos y servicios que tiendan a prestar al liberado una asistencia postencierro que le permita afrontar el difícil período que constituye aquel en el cual recupera su libertad, contribuyendo a minimizar los prejuicios que sobre él puedan recaer y, por supuesto, disminuir las causas que puedan eventualmente conducirlo a una recaída delictual

Control-oriented model of a membrane humidifier for fuel cell applications

© . This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/Improving the humidification of polymer electrolyte membrane fuel-cells (PEMFC) is essential to optimize its performance and stability. Therefore, this paper presents an experimentally validated model of a low temperature PEMFC cathode humidifier for control/observation design purposes. A multi-input/multi-output non-linear fourth order model is derived, based on the mass and heat dynamics of circulating air. In order to validate the proposed model and methodology, experimental results are provided. Finally, a non-linear control strategy based on second order sliding mode is designed and analyzed in order to show suitability and usefulness of the approach.Peer ReviewedPostprint (author's final draft

Identification and observation in the anode line of PEM fuel cell stacks

In this work, some potential identification/observation problems that arise in the anode line of a typical Polymer Electrolyte Membrane (PEM) fuel cell based system are highlighted and then solved. They involve estimating the hydrogen input flow at the stack anode and the water transport across the membrane. It is argued that estimating the membrane water transport is of special interest since it gives relevant information on the actual performance and state of the fuel cell. Both problems are solved by constructing robust observers and parameter identification algorithms based on the Generalized Super-Twisting Algorithm.Peer ReviewedPostprint (author’s final draft

Optimization-based thermal control strategy for auxiliary cooling circuits in fuel cell vehicles

© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other worksIn this research work, a thermal management concept for the auxiliary components in fuel cell vehicles is discussed. A control-oriented model of the subsystem under analysis is developed and then used as basis for controller development. Two control strategies are implemented and compared. The first is a PI-controller strategy and it is used as a baseline for performance comparison. The second is an optimization-based controller (OBC) strategy focused on minimizing the power consumption of the main actuator. The OBC features a novel steady-state observer (SSO) developed for thermal circuits and provides an estimation of the steady-state conditions and conveniently simplifies the optimization problem by disregarding the dynamics of the states so that it can be implemented online with lower computational burden. Comparisons between PI-control strategy and OBC demonstrate the OBC’s capabilities in overcoming typical problems associated with the PI-control strategy including high power consumption of the actuators and temperature constraint violations under particular operating conditions.Postprint (author's final draft

Control of an active rectifier with an inductive-capacitive-inductive filter using a Twisting based algorithm

This paper presents a novel controller for an active rectifier with an inductive-capacitive-inductive filter. The proposed control scheme comprises two levels. The internal level, is a current controller based on the second order sliding mode Twisting algorithm, which robustly ensures an unity power factor at the connection point. The slower external level is a PI controller in charge of regulating the output DC voltage to a desired reference. The controller setup also includes a finite-time observer of the current derivative that can be used to avoid direct (and sometimes problematic) numerical differentiation. Finally, simulation results are presented to validate the proposed control scheme.Instituto de Investigaciones en Electrónica, Control y Procesamiento de SeñalesConsejo Nacional de Investigaciones Científicas y Técnica