# American Institute of Mathematical Sciences

May  2020, 25(5): 1835-1858. doi: 10.3934/dcdsb.2020005

## On the limit cycles of a class of discontinuous piecewise linear differential systems

 1 Departament de Matematiques, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Catalonia, Spain 2 Instituto de Matemática e Estatística, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil

* Corresponding author: Jaume Llibre

Received  December 2018 Revised  July 2019 Published  December 2019

Fund Project: The first author is partially supported by the Ministerio de Economía, Industria y Competitividad, Agencia Estatal de Investigación grant MTM2016-77278-P (FEDER) and grant MDM-2014-0445, the Agència de Gestió d'Ajuts Universitaris i de Recerca grant 2017SGR1617, and the H2020 European Research Council grant MSCA-RISE-2017-777911. The second author is partially supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brazil(CAPES) grant PDSE-88881.133794/2016-01 and a CAPES finance code 001 grant.

In this paper we consider discontinuous piecewise linear differential systems whose discontinuity set is a straight line $L$ which does not pass through the origin. These systems are formed by two linear differential systems of the form $\dot{x} = Ax\pm b$. We study the limit cycles of this class of discontinuous piecewise linear differential systems. We do this study by analyzing the fixed points of the return map of the system defined on the straight line $L$. This kind of differential systems appear in control theory.

Citation: Jaume Llibre, Lucyjane de A. S. Menezes. On the limit cycles of a class of discontinuous piecewise linear differential systems. Discrete & Continuous Dynamical Systems - B, 2020, 25 (5) : 1835-1858. doi: 10.3934/dcdsb.2020005
##### References:
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##### References:
 [1] J. C. Artés, J. Llibre, J. C. Medrado and M. A. Teixeira, Piecewise linear differential systems with two real saddles, Math. and Comp. in Simul., 95 (2014), 13-22.  doi: 10.1016/j.matcom.2013.02.007.  Google Scholar [2] O. A. R. Cespedes, Ciclos Limite e Singularidades Típicas de Sistemas de Equações Diferenciais Suaves por Partes, Ph.D thesis, Universidade Federal de Goiás, 2015. Google Scholar [3] E. Freire, E. Ponce and F. Torres, Canonical discontinuous planar piecewise linear systems, J. App. Dyn. Systems, 11 (2012), 182-211.  doi: 10.1137/11083928X.  Google Scholar [4] M. A. Han and W. N. Zhang, On Hopf bifurcation in non-smooth planar systems, Differential Equations, 248 (2010), 2399-2416.  doi: 10.1016/j.jde.2009.10.002.  Google Scholar [5] S.-M. Huan and X.-S. Yang, On the number of limit cycles in general planar piecewise linear systems, Discrete Contin. Dyn. Syst., 32 (2012), 2147-2164.  doi: 10.3934/dcds.2012.32.2147.  Google Scholar [6] J. H. Liang and S. Y. Tang, Global qualitative analysis of a non-smooth Gause predator-prey model with a refuge, Nonlinear Anal., 76 (2013), 165-180.  doi: 10.1016/j.na.2012.08.013.  Google Scholar [7] J. Llibre, D. D. Novaes and M. A. Teixeira, Maximum number of limit cycles for certain piecewise linear dynamical systems, Nonlinear Dyn., 82 (2015), 1159-1175.  doi: 10.1007/s11071-015-2223-x.  Google Scholar [8] J. Llibre and A. E. Teruel, Existence of Poincaré maps in piecewise linear differential systems in ${\mathbb{R}}^n$, Int. J. Bifurcation and Chaos, 14 (2004), 2843-2851.  doi: 10.1142/S0218127404010874.  Google Scholar [9] J. Llibre and A. E. Teruel, Introduction to the Qualitative Theory of Differential Systems, Birkhäuser/Springer, Basel, 2014. doi: 10.1007/978-3-0348-0657-2.  Google Scholar [10] J. Llibre and E. Ponce, Three limit cycles in discontinuous piecewise linear differential systems with two zones, Dyn. of Cont., Discr. Impul. Syst., Series B, 19 (2012), 325-335.   Google Scholar [11] J. C. Medrado and J. Torregrosa, Uniqueness of limit cycles for sewing piecewise linear systems, J. Math. Anal. Appl., 431 (2015), 529-544.  doi: 10.1016/j.jmaa.2015.05.064.  Google Scholar
Qualitative behavior of the Poincaré map $\pi_{++}$; $(a) \quad t>0$ and $(b) \quad t<0$
Qualitative behavior of the Poincaré map $\pi_{++}$; $(a) \quad t>0$ and $(b) \quad t<0$
Qualitative behavior of the Poincaré map $\pi_{++}$; $(a) \quad t>0$ and $(b) \quad t<0$
Qualitative behavior of the Poincaré map $\widetilde{\pi}_{++}$; $(a) \quad t>0$ and $(b) \quad t<0$
Relation between the half–lines $L^O_+$, $L^I_+$, $L^{*O}_+$, and $L^{*I}_+$ depending on (a) $e_+\in S_-$, (b) $e_+\in S_+$
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