International Science Community Association Research Journal of Recent Sciences 2277 - 2502 5 1 2016 January 2 Open Loop Step test used for Process Identification and PID tuning controller by Genetic Algorithms 16 26 EN Mohammadnia Leila 1 Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, IRAN Jalal Amini 2 Department of Geometric Engineering, Collage of Engineering, University Of Tehran, Tehran, IRAN Alima Esther Irma Nougbode Yéwêgnon 1 Laboratoire d’Hydrologie Appliquée (LHA), Faculté des Sciences et Techniques, Université d’Abomey Calavi, Cotonou, BENIN Sessou Philippe 2 Laboratoire d’Etude et de Recherche en Chimie Appliquée (LERCA), Ecole Polytechnique d’Abomey Calavi(EPAC), Université d’AbomeyCalavi, Cotono, BENIN Abdoukarim Alassane 3 Laboratoire d’Hydrologie Appliquée (LHA), Faculté des Sciences et Techniques, Université d’Abomey Calavi, Cotonou, BENIN Abdou Karim Alassane Youssao 4 Laboratoire d’Etude et de Recherche en Chimie Appliquée (LERCA), Ecole Polytechnique d’Abomey Calavi(EPAC), Université d’AbomeyCalavi, Cotono, BENIN Cokou Pascal Agbangnan 5 Laboratoire d’Etude et de Recherche en Chimie Appliquée (LERCA), Ecole Polytechnique d’Abomey Calavi(EPAC), Université d’AbomeyCalavi, Cotono, BENIN Daouda Mama 6 Laboratoire d’Hydrologie Appliquée (LHA), Faculté des Sciences et Techniques, Université d’Abomey Calavi, Cotonou, BENIN Koko Codjo Dominique Sohounhloue 7 Laboratoire d’Etude et de Recherche en Chimie Appliquée (LERCA), Ecole Polytechnique d’Abomey Calavi(EPAC), Université d’AbomeyCalavi, Cotono, BENIN Jiménez Rubén Lagunas 1 Universidad Autonoma de Campeche, MÉXICO Medina Alberto Lorandi 2 Instituto de Ingenieria, Universidad Veracruzana, MEXICO Hermida Saba Guillermo 3 Instituto de Ingenieria, Universidad Veracruzana, MEXICO > Research Paper 2014 8 12 2016 January 2 In this article a proposal to solve two control problems from multiple point identification process frequency response of linear models, using an open loop step, is presented. The identified points are used, in one case a PID controller tuning, and the other application deals with transfer function modeling problem, both problems are stated as a nonlinear least squares unconstrained minimization problem. The optimization problem is solved with a simple genetic algorithm. Copyright@ International Science Community Association