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If this adjust is done through a \u201ctrial and error\u201d procedure, then it will be very time-consuming and difficult to reach a good performance. Frequently, the tuning of the Membership Functions (MFs) have the most influence to improve the performance of a FC. Therefore, in this study we tune the MFs of a FC using optimization by Direct Search (DS) method, specifically the pattern search. In this sense, our goal is to improve the performance of the system to satisfy certain conditions and propose optimization method to tune the MFs. The methodology of the optimization is simulation-based. The Objective Function (OF) is the squared error between the set point and the output of the system. The evaluation of the OF and the implementation of the fuzzy control system were performed by simulations. An explanation of the algorithmic method based on the pattern search algorithm is shown. The method proposed in this paper is illustrated with examples for the non-linear systems. The results are compared and discussed with other controllers.<\/jats:p>","DOI":"10.3233\/jifs-190003","type":"journal-article","created":{"date-parts":[[2019,8,23]],"date-time":"2019-08-23T10:54:36Z","timestamp":1566557676000},"page":"3763-3776","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":4,"title":["Tuning of the membership functions of a fuzzy control system using pattern search optimization method"],"prefix":"10.1177","volume":"37","author":[{"given":"Panayotis","family":"Tremante","sequence":"first","affiliation":[{"name":"Department of Electronic, Computing and Control, School of Electric Engineering, Faculty of Engineering, Universidad Central de Venezuela, Caracas-Venezuela"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kang","family":"Yen","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, College of Engineering and Computing, Florida International University, Miami \u2013 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ebert","family":"Brea","sequence":"additional","affiliation":[{"name":"Department of Electronic, Computing and Control, School of Electric Engineering, Faculty of Engineering, Universidad Central de Venezuela, Caracas-Venezuela"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2019,8,22]]},"reference":[{"key":"e_1_3_1_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/0165-0114(93)90207-X"},{"key":"e_1_3_1_3_2","doi-asserted-by":"publisher","DOI":"10.1109\/5326.704574"},{"key":"e_1_3_1_4_2","unstructured":"BertsekasD.P. 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