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This paper first presents a singularity-free indirect adaptive control algorithm for nonlinear systems with known control direction, and then this control algorithm is generalized for the case of unknown control direction. The proposed adaptive controllers are free from singularity, allow initialization to zero of all adjustable parameters of the used fuzzy systems, and guarantee asymptotic convergence of the tracking error to zero. Simulations performed on a nonlinear system are given to show the feasibility of the proposed adaptive control schemes.<\/p>","DOI":"10.4018\/ijfsa.2011100101","type":"journal-article","created":{"date-parts":[[2011,10,19]],"date-time":"2011-10-19T12:21:44Z","timestamp":1319026904000},"page":"1-17","source":"Crossref","is-referenced-by-count":3,"title":["Indirect Adaptive Fuzzy Control for a Class of Uncertain Nonlinear Systems with Unknown Control Direction"],"prefix":"10.4018","volume":"1","author":[{"given":"Salim","family":"Labiod","sequence":"first","affiliation":[{"name":"University of Jijel, Algeria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hamid","family":"Boubertakh","sequence":"additional","affiliation":[{"name":"University of Jijel, Algeria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thierry Marie","family":"Guerra","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Valenciennes et du Hainaut-Cambr\u00e9sis, France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2432","reference":[{"key":"ijfsa.2011100101-0","doi-asserted-by":"publisher","DOI":"10.1016\/j.fss.2009.04.011"},{"key":"ijfsa.2011100101-1","doi-asserted-by":"publisher","DOI":"10.1109\/9.310070"},{"key":"ijfsa.2011100101-2","doi-asserted-by":"publisher","DOI":"10.1109\/91.919249"},{"key":"ijfsa.2011100101-3","doi-asserted-by":"publisher","DOI":"10.1016\/j.fss.2009.10.026"},{"issue":"4","key":"ijfsa.2011100101-4","doi-asserted-by":"crossref","first-page":"404","DOI":"10.1360\/aas-007-0404","article-title":"Variable structure model reference adaptive control with unknown high frequency gain sign.","volume":"33","author":"W. 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